Industrial Electronics Society Annual Conference 

Vol.2 ,   2-6 Nov. 2004           Access to the IES Annual Conference on IEEE XPLORE     IE Transactions Home Page




1    Lee-Hun Kim, Kwang-Su Chun, Chung-Yuen Won, Soo-Seok Kim, Se-Wan Choi, "An improved scheme for high-efficiency push-pull converter using single winding self-driven synchronous rectification," Industrial Electronics Society Annual Conference, Vol.2 , pp. 999- 1003 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a method of synchronous rectifier (SR) for improving the efficiency in DC/DC converter. The proposed method is used push-pull topology on each half primary as a single winding self-driven synchronous rectification (SWSDSK). Specially, this method can improve efficiency to let SR switch turn on during dead time. Based on the novel design scheme for auxiliary winding in the power transformer, The SR's MOSFET is turn on fully even when the voltage in the transformer is zero. For verification, there are analyzed and compared improved single winding self-driven synchronous rectification (ISDSR) with various conventional SR topology.

2    Soo-Seok Kirn, Seung-Pil Mun, Jin-Tae Kirn, Su-Jin Jang, Chung-Yuen Won, "A new sepic-flyback converter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1004- 1007 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new sepic-flyback converter has been proposed, which is suitable for buck-boost topology. The proposed converter is superposition of sepic converter mode and flyback converter mode. Not only sepic mode output but also flyback mode output can be fully regulated by constant frequency PWM control. Merging sepic and flyback topology can share the transformer and power MOSFET. A new converter has outstanding advantages over the conventional dc-dc converters with respect to high efficiency, high power density, and component utilization. The operation principle of the proposed converter is described and verified by simulation and experimental result. Also this paper presents novel circuit and simulation result of new active sepic-flyback converter.

3    Yueh-Ru Yang, "Analysis of winding capacitance effects on ringing choke converters," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1008- 1013 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Effects of parasitic winding capacitance on the circuit operations of ringing choke converters are analyzed in this paper. Intrinsically, the ringing choke converter is a blocking oscillator but its flyback magneto-motive force is rectified for dc output. By adding a transition capacitor to increase the winding capacitance, the stabilization of output voltage is improved, and the required dummy load can be decreased. This article analyzes the switching pattern of ringing choke converters by qualitative state-plane analysis and verifies the parasitic capacitance effects at a 35-Watt circuit.

4    Ko-Yen Lee, Yen-Shin Lai, "A novel magnetic-less bi-directional dc-dc converter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1014- 1017 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel bidirectional dc-dc converter, which doesn't use any magnetic component; and thereby reducing the losses and size of the converter significantly. As compared with previous approach Peng, F.Z., et al. (2003), the presented dc-dc converter requires less switching devices and reduces the capacitor losses. For the presented converter, the voltages balance among capacitors can be achieved without requiring high switching frequency as shown in Peng, F.Z., et al. (2003). Moreover, the merits presented in Peng, F.Z., et al. (2003), including: 1) no magnetic components; 2) compact size and light weight; 3) easy manufacturing (possible to build a whole converter system on package, or IC power module); 4) high efficiency (>94%); and 5) low EMI emission, are retained. A converter with 42/14 volt, 330 W has been implemented. Both theoretical analysis and experimental results demonstrate that the presented converter indeed provides the above-mentioned features.

5    Shui-Chun Lin, Ching-Chih Tsai, "Adaptive voltage regulation and equal current distribution of parallel-buck DC-DC converters using backstepping sliding mode control," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1018- 1023 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops a novel methodology for voltage regulation and equal current distribution of parallel-buck DC-DC converters. Such converters are modeled as linear averaged state-space system models with adjustable loads. Two measurements, such as output voltage and inductor current, are used to accomplish the design of an adaptive backstepping sliding mode controller for the parallel-buck DC-DC converters. Based on the singular perturbation method, a reduced order model is derived in order to show that the effect of equivalent series resistance (ESR) of the capacitor can be ignored and the parallel converters can be well approximated by the reduced order model. With the reduced order model, an adaptive sliding mode control utilizing backstepping approach is proposed to control the parallel-buck DC-DC converters. This proposed control method has been verified by computer simulations, and has also been proven capable of giving satisfactory voltage regulation performance under input voltage variations and load changes.

6    Hao Ma, Wenqi Zhou, "Modeling a current source push-pull resonant converter for loosely coupled power transfer systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1024- 1029 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the generalized model of an inductively coupled power transfer (ICPT) system, which could transfer power efficiently, is built to predict the output power and voltage of the system. The basic concept and structure of ICPT systems is described and a current source push-pull resonant converter for ICPT is presented, and some characteristics of the ICPT system are discussed. The equivalent circuit model is built with mutual inductance concept. Based on this model, equations are obtained to calculate the output power, voltage and resonant frequency, which are verified by experimental results. A brief loss analysis based on Steinmetz equation is given to explain the difference between the predicted and measured values, which are verified by experimental results to make the model more accurate.

7    Byoung-Ho Kim, S. Hosoe, "A model of soft contact-based manipulation systems and its application to writing tasks," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1030- 1035 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a model for soft contact-based manipulation systems and also deals with a soft-fingered writing task in terms of the deformational influence of soft fingertips. In order to evaluate the motion control of a soft-fingered writing task, we use a manipulation control scheme that considers the deformational properties of soft fingertips. Through simulation results, we show that the softness of fingertips plays an important factor when the precision of a writing task is highly considerable.

8    T. Kishimoto, Y. Fujimoto, "Numerically stable inverse kinematics calculation of robot manipulators even in singular configuration," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1036- 1040 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents new method of solving inverse kinematics problem for robot manipulators. It is impossible to solve inverse kinematics problem in singular configuration until today. In this proposal, we can get the most suitable angle by using Newton method, minimizing the difference between target and present position. A numerical study of a three-dimensional three-link manipulator confirms the validity of the proposed method.

9    Dong-Yean Jung, Yong-Tae Kim, Sung-Hyun Han, Man-Hyung Lee, "Real-time implementation of a robust adaptive controller for a robotic manipulator based on digital signal processors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1041- 1051 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper we propose a new technique to the design and real-time control of an adaptive controller for robotic manipulator based on digital signal processors. The Texas Instruments DSPs (TMS320C80) chips are used in implementing real-time adaptive control algorithms to provide enhanced motion control performance for robotic manipulators. In the proposed scheme, adaptation laws are derived from model reference adaptive control principle based on the improved Lyapunov second method. The proposed adaptive controller consists of an adaptive feed-forward and feedback controller and time-varying auxiliary controller elements. The proposed control scheme is simple in structure, fast in computation, and suitable for real-time control. Moreover, this scheme does not require any accurate dynamic modeling, or values of manipulator parameters and payload. Performance of the proposed adaptive controller is illustrated by simulation and experimental results for robot manipulator with eight joints at the joint space and Cartesian space.

10    A. Matsuura, Y. Ishikura, J. Hirai, "A preliminary study for reconfigurable robot system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1052- 1057 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In order to expand the scope of robot application, the robot should cope with the divergence of the assigned tasks and surrounding environments. With the conventional type of robot, however, the scope of the application is limited due to the lack of its reconfigurability. The authors, therefore, propose to realize a novel robot called reconfigurable robot, which is capable of changing its structure adaptively to the situation and the given tasks. The fundamental features of the robot are introduced and problems to be solved for its realization are described in this paper.

11    Bang-Hyun Cho, Byoung-Suck Choi, Jang-Myung Lee, "Time-optimal trajectory planning for a robot system under torque and impulse constraints," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1058- 1063 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, moving a fragile object from an initial point to a specific location in the minimum time without damage is studied. In order to achieve this goal, initially, the range of maximum acceleration and velocity are specified, which the manipulator can generate dynamically on the path that is planned a priori considering the geometrical constraints. Later, considering the impulsive force constraint on the object, the range of maximum acceleration and velocity are obtained to keep the object safe while the manipulator is carrying it along the curved path. Finally, a time-optimal trajectory is planned within the maximum allowable range of acceleration and velocity. This time-optimal trajectory planning can be applied to real applications and is suitable for not only a continuous path but also a discrete path.

12    N. Oda, T. Nagaki, M. Takigahira, "An approach of hip motion compensation using laser range sensor for biped walking robot," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1064- 1069 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes an optical sensing approach of gait compensation by using laser range finder for biped walking robot. Generally in the biped robot control, the response force information received from ground environment is one of important Indexes to realize stable gait generation. For fault tolerant and more reliable walking motion of the future, this paper focuses on the walking motion using the geometric relation between robots and floor environment without force sensor. That is, sole deformation is observed by laser range sensor mounted at the hip of robot, and is used for modifying the hip motion into more balanced direction by using the virtual impedance model. The validity of the proposed approach is confirmed by several experimental results.

13    M. Yu, Y.G. Park, S.H. Jeong, W.S. Chong, T.K. Kwon, C.U. Hong, N.G. Kim, "Sensory-motor coordination using visual stimulation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1070- 1075 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The purpose of this work is to study a process organization on space cognition by vision. This investigation is to observe the relationship between the head and the eye motor system for the localization of visual target direction in space. The experiments are performed in a soundproof chamber. Nineteen red LED (luminescent diode, brightness: 210 cd/m/sup 2/) arrayed in the horizontal plane of the surrounding panel are used and the LED are 10 degrees apart from each other. Physiological parameters such as EOG (electro-oculography), head movement and their synergic control are measured by BIOPAC system and 3SPACE FASTRAK. This result shows that the response time of the perception motion in the center is faster than the periphery of the panel, The latency time is shorter in self moved tracking (SMT) than eye alone tracking (EAT) and eye hand tracking (EHT). These results can be used in the study of characterizing the spatial cognition.

14    Jin-Kyoung Heo, Seung-Kyu Park, "Dual histogram re-allot for contour extraction & image improvement," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1076- 1079 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Emphasized images are used very useful at contour extraction and image recognition. Emphasized image is not only good looking image but clear and sharp image. It have different image recognition rate by how much represent original information in row quality source image. Existing algorithms that get emphasized image does not get clear picture in various kind of images, or have slow process time being proportional size of image or accumulation rate of histogram. This paper describes a new algorithm for improvement image. The method is based on histogram equalization, and change pixels by dual tracking according to concentration degree of pixel value in histogram distribution chart, when did via process time by histogram smoothing that is existent method, can extract image improving within process time of 10% in proposed method about experimenting image, and suggests algorithm that can display performance more than maximum 300 times in case of image that histogram is converged in specification pixel partially.

15    Chih-Chang Lai, Ching-Chih Tsai, Han-Chang Lin, "Brightness improvement of color display systems using white sub-pixel structure and mapping algorithm," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1080- 1085 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops methodology and technique for brightness improvement of color display systems using white sub-pixels. Based on human vision discrimination, three novel white sub-pixel filter structures without loss of original resolution are presented to enhance brightness of conventional stripe, delta and pentile color filter architectures. A new mapping algorithm fusing RGB sub-pixel data around a white sub-pixel is proposed to improve overall image quality. Numerous simulation results are provided to show the feasibility and efficacy of the proposed method for improving conventional stripe, delta and pentile display systems. An experimental result is described which has been conducted to show that the proposed color display system performs well for electronic consumer products, such as notebooks, personal digital assistants, and mobile phone, etc.

16    H. Kim, S. Honda, S. Ishikawa, K. Okuda, A. Yamamoto, S. Katsuragawa, M.A. Viergever, "Automatic extraction of liver regions and classification of liver cirrhosis from the abdominal CT images," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1086- 1089 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We propose a new technique for automatic extraction of liver region and its classification for liver cirrhosis by computer based on a set of abdominal CT images. In this paper, we extract a liver area for extraction of the region of interest employing smoothing, binarization, expansion, shrinking, and labeling process from the inputted each slice images. The region having the largest area is regarded as a tentative liver region. Furthermore, to delete surrounding tissues, we create a new liver region from the estimation of a slice having the greatest square employing Mahalanobis distance. Finally, the liver cirrhosis is classified from the liver region with respect to the abdominal CT images. Experiment is performed employing twenty abdominal CT image sets and the obtained results are shown along with a discussion.

17    H. Ushijima, H. Kim, S. Ishikawa, Y. Otsuka, H. Shimizu, Y. Nakada, T. Shinomiya, "Automatic spinal deformity detection based on asymmetric degree of moire topographic images," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1090- 1093 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Spinal deformity is a disease mainly suffered by teenagers during their growth stage particularly from fifth year in the elementary school to second year in the middle school. For checking the spinal deformity detection, a large amount of moire images were collected from elementary as well as junior high schools by orthopedists. This causes exhaustion of doctors and therefore led to misjudgment. Therefore realization of automated spinal deformity inspection based on the moire images has long been desired among orthopedists. In this paper, we propose a technique for spinal deformity detection based on difference of symmetric degree on moire topographic images. The technique can classify as normal or abnormal from the inputted moire topographic images automatically.

18    Zhang Yanqing, Wang Zhiyan, "A high speed professional scanner based on CCD arrays and parallel buffer," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1094- 1098 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, CCD arrays are used to replace linear CCD components that are popular in many high-speed scanners; a high-speed parallel buffer and paper feed device based on static electricity principle are also devised. Compared with linear CCD components, CCD arrays can provide resolutions in two directions, x and y. It can make the scan speed in the y direction much quicker, not limited by the low-speed mechanical driver. And also, the matching problems of scan linearity in x and y directions are solved. Paper feed device based on static electricity principle can make scan scope vary freely, not restricted by the type of scanning targets; and the scan speed is increased, not influenced by the size of papers. The buffer gives scanner the parallel ability in processing data, which can transfer data acquired by CCD arrays more quickly. In addition, the cost of this method is low.

19    Seok Ho Jeon, Dane Baang, Jin Young Choi, "Adaptive feedback linearization control based on airgap flux model for induction motors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1099- 1104 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an adaptive feedback linearization control scheme for induction motors with unknown rotor and stator resistances. We use an airgap flux model, which combines the advantages of existing rotor flux model and stator flux model. Theoretical analysis, simulation results, and real experimental results show that, if the persistent excitation is satisfied, stator and rotor resistances converge to their actual values, flux is well estimated, and torque and flux can be controlled independently with the measurements of rotor speed, stator currents and stator voltages.

20    R.Z. Pires, L.F.A. Pereira, M.C. Magnus, C.C. Scharlau, "Adaptive control of nonlinear systems applied to the three-phase induction motor with unknown mechanical parameters," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1105- 1110 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper compares different adaptive control methods for non-linear systems, using state feedback linearization methodology. The three-phase induction machine with unknown mechanical parameters is used as an example of the non-linear system to be controlled. Results of simulations are presented.

21    J. Soltani, G.R.A. Markadeh, S.H. Hosseiny, "A new adaptive direct torque control (DTC) scheme based-on SVM for adjustable speed sensorless induction motor drive," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1111- 1116 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a combination of direct torque control (DTC) and space vector modulation (SVM) for an adjustable speed sensorless induction motor (IM) drive. The motor drive is supplied by a two-level constant switching frequency SV-based PWM inverter. The inverter reference voltage is obtained based on input-output feedback linearization control, using the IM model in the stator dq-axes reference frame with stator currents and flux as state variables. In addition candidate a Lyapunov function, a novel nonlinear flux observer is introduced which provides simultaneous estimation of the stator flux, rotor speed, rotor and stator resistances. Moreover in the speed loop control of the IM drive, a sliding mode controller is employed that forces the system states to lie on to the sliding surface and makes the speed error exponentially tend to zero. Finally, the effectiveness of the proposed control approach is verified by computer simulation.

22    J. Soltani, M. Hajian, G.R.A. Markadeh, "Equivalent loading of induction motors using a new composite power supply with a linear (V/Hz) characteristic," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1117- 1122 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel variable voltage magnitude variable frequency (VVMVF) composite voltage source is introduced which has a linear (V/Hz) characteristic and can be used for equivalent loading of ac machines, without any need to apply the mechanical load to the test machine's shaft The proposed power supply is composed of a regular constant voltage and frequency source (main source) and an especial PWM inverter (auxiliary source), connected in series using an isolating transformer. As an example, a 1.5 kW single-phase power source of the above type was practically implemented and used for equivalent loading of a single-phase capacitor start induction motor. Simulation and experimental results obtained are in close agreement.

23    Jinming Yang, N.C. Cheung, Jie Wu, "The auto-disturbance rejection controller for speed regulation in permanent-magnet linear motors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1123- 1127 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel robust control strategy for the speed regulation of a permanent-magnet linear motor (PMLM) based on direct feedback linearization. This method takes into account both the uncertainties in the model and the uncertainties from the outside environment as the unknown disturbances to the system. These unknown disturbances are estimated through an extended state observer (ESO). A nonlinear state error feedback control law (NLSEF) is designed according the estimated disturbances. With the proposed auto-disturbance rejection controller (ADRC), the disturbance can be compensated and nonlinear system can be decoupled into linear subsystems. The control law only has relationships with the reference Input and the output Therefore the control is much simplified with fewer variables detected. The feasibility and robustness of the proposed control method is verified by simulation.

24    Guowen Hu, Ming Cheng, Guilong Cai, "Relation between fundamental frequency equivalent impedance and resonant point for thyristor controlled series compensation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1128- 1132 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper studies the relation between the fundamental frequency equivalent impedance of the TCSC and the basic frequency reactance of the TCR, A new concept of equivalent capacitor C/sub T/ of the TCSC capacitor circuit is proposed based on the dynamic simulation experiment of the thyristor controlled series compensator (TCSC), revealing that the equivalent capacitor of TCSC circuit is not a fixed value but varies with control angle /spl beta/. The effect of the fundamental frequency reactance X/sub L/ of TCR on the resonance point and the controlled range is also investigated. The impact on the waveforms and values of current and voltage in the thyristor circuit and the capacitance circuit are analyzed. Both the emulation and dynamic simulation experiment are carried out. The proportion relation between X/sub C/ and X/sub L/ is optimized.

25    H. Kojima, K. Matsui, K. Tsuboi, "Static Var compensator having active filter function for lower order harmonics," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1133- 1138 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, various harmonic characteristics of SVC's (static Var compensators) are discussed, comparison being made between symmetrical and asymmetrical modulation strategies, which influence a quality of output waveform. It appears that the asymmetrical modulation strategy is the better approach in higher power factor applications such as ac motor drives. However, in a case requiring a passive filter, for example, with an extremely large scale SVC, a symmetrical modulation strategy is superior. Therefore, in this research, a symmetrical modulation is preferred for an NPC-PWM inverter. Since the harmonics, due to the switching appear in a limited narrow frequency band, such output harmonics can be easily eliminated using a simple passive filter. Furthermore, harmonics such as the fifth and the seventh can be suppressed using the proposed SVC scheme, in which the feedback signals for the fifth and seventh harmonics are injected into the SVC. Using these feedback signals, the harmonics in the power system can be significantly reduced. This result is confirmed by simulation. Thus, in addition to the proper operation of the SVC, it is possible to perform an active filtering function.

26    Xianglian Xu, Yunping Zou, Kai Ding, Fei Liu, "Cascade multilevel inverter with phase-shift SPWM and its application in STATCOM," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1139- 1143 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A cascade multilevel voltage-source inverter with separate dc sources is proposed for static synchronous compensation (STATCOM). It can solve the size-and-weight problems of conventional transformer-based multipulse inverters and the component-counts problems of multilevel diode-clamp and flying-capacitor inverter. Phase-shift sinusoidal pulse width modulation (PS-SPWM) technique is employed to control the switching devices of each voltage-source inverter, as a result, the devices operate at a higher equivalent carrier frequency. In conclusion, the inverter has such advantages as: 1) reducing power loss because of transform-less design; 2) generating almost sinusoidal waveform voltage with high equivalent carrier frequency; 3) eliminating transformers of multipulse inverters used in the conventional STATCOM; 4) dynamic response fast; and 5) direct connection to power distribution system without any transformer. This paper focuses on feasibility and control schemes of the cascade multi-level inverter. Simulation of a three-phase 5-level inverter with reactive power regulation using MATLAB-Simulink power system blockset is carried out. The analytical and simulated results show the feasibility and superiority of the proposed inverter for static synchronous compensation.

27    Eun-Chul Shin, Sung-Min Park, Won-Hyun Oh, Dong-Sik Kim, Sang-Bin Lee, Ji-Yoon Yoo, "A novel hysteresis current controller to reduce the switching frequency and current error in D-STATCOM," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1144- 1149 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a study on a novel hysteresis current controller of a STATCOM (static synchronous compensator) used for reactive power compensation on a distribution network. Hysteresis controllers are intrinsically robust to system parameters, exhibit very high dynamic response and are suitable for simple implementation. But the current control using a conventional hysteresis controller in D-STATCOM has the disadvantage that high switching frequency may happen due to lack of coordination among individual hysteresis controllers of three phases. This will of course increase the switching loss. In addition, the current error is not strictly limited. So, in this paper to reduce the switching frequency and current error, a novel hysteresis current controller in synchronous rotating reference frame is proposed. The presented control system was tested with digital simulation in the Borland C++ program and demonstrates the advantage of the novel hysteresis current controller.

28    S.H. Hosseini, A. Ajami, "Voltage regulation and transient stability enhancement of a radial AC transmission system using UPFC," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1150- 1154 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The unified power flow controller (UPFC) is a typical FACTS (flexible AC transmission systems) device that is capable of the instantaneous control of transmission line parameters. This paper presents the transient model and control system of UPFC. The presented control system enables the UPFC to following the exchanges of line active and reactive power reference values, regulating the DC link voltage and bus voltage. The presented control scheme has the fast dynamic response and therefore, improves the transient behavior of power system after a transient condition. The presented simulation results demonstrate that the presented control system acts properly in the steady and transient states. The presented control system of UPFC was simulated and tested with the PSCAD/EMTDC simulation program.

29    H. Sugimura, T. Ahmed, M. Orabi, Hyun-Woo Lee, M. Nakaoka, "Commercial utility frequency AC to high frequency AC soft switching power conversion circuit with non smoothing DC link for IH dual packs heater," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1155- 1160 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel topology of soft switching PWM high frequency AC power conversion conditioning and processing circuit without DC smoothing capacitor filter link from the voltage grid of utility frequency AC power supply source with 60 Hz-100 V or 60 Hz-200 V is proposed and introduced for innovative consumer induction heating (IH) boiler applications as a hot water producer, steamer and super heated steamer. The operating principle of utility frequency AC-high frequency AC power frequency conversion circuit defined as high frequency cycloinverter is described, which can efficiently operate under a principle of zero voltage soft switching and regulate by means of positive and negative alternate asymmetrical PWM synchronized with the utility frequency single phase AC voltage. The dual mode control scheme based on high frequency PWM and commercial frequency AC voltage PDM for high frequency cycloinverter are discussed in order to extend its soft switching commutation operating range in spite of power regulation. This power frequency changer as high frequency cycloinverter is developed originally for the high frequency induction heating boiler in consumer and industrial fluid pipeline system. It is verified on the basis of experiment and simulation results in the steady state operation of the high frequency cycloinverter using IGBTs which is suitable for the business-use IH boiler using new electromagnetic induction heating dual packs fluid heater. Finally, the power regulation characteristics in addition to utility AC side line current harmonic components and power factor characteristics and power conversion efficiency characteristics of this high frequency cycloinverter are evaluated and discussed from an experimental point of view.

30    Shuo Chen, M. Tsuji, S. Hamasaki, T. Motoo, "A mechanical sensorless vector-controlled induction motor system with parameter identification by the aid of image processor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1161- 1165 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a mechanical sensorless vector-controlled system for induction motors with the assistance of an image processor. Based on the observer theory and the adaptive control theory, the proposed system includes a rotor speed estimator and stator resistance identifier using the flux errors and rotor resistance identifier using the speed error between the estimated speed and the calculated speed by the aid of image sensor. The effectiveness of the proposed system has been verified by digital simulation and experimentation.

31    M. Pacas, S. Villwock, T. Eutebach, "Identification of the mechanical system of a drive in the frequency domain," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1166- 1171 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: High performance drives require sophisticated control methods. For the tuning of such control schemes the mathematical model describing the plant must be known with some degree of confidence. Therefore, a reliable procedure for the identification of the drive system is aimed. Besides, it should be possible to implement it as part of an automatic tuning of the control. The present paper proposes some solutions for this task.

32    Huili Sun, L.A.C. Lopes, Zhixiang Luo, "Analysis and comparison of islanding detection methods using a new load parameter space," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1172- 1177 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Anti-islanding protection is a mandatory feature for grid-connected inverters. The effectiveness of passive islanding detection methods (IDMs) is usually demonstrated by means of non-detection zones (NDZs) represented in a power mismatch space (/spl Delta/P /spl times/ /spl Delta/Q). A number of active type IDMs with improved performance have been presented but their effectiveness cannot be compared using the /spl Delta/P /spl times/ /spl Delta/Q space. This paper proposes a new load parameter space for comparing the effectiveness of IDMs where the influence of the load resistance can be easily assessed. Equations that represent NDZs for the /spl Delta/P /spl times/ /spl Delta/Q and proposed load parameter space are derived and verified by simulation.

33    K. Suzuki, S. Shimomura, "Position estimation scheme robust for rapid change of inductances in synchronous reluctance motors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1178- 1183 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Generally, It is supposed that there is the difference of 20% at least between the inductance at a light load and the one at the ratings load. Position sensorless control methods robust for the change of the inductance have been proposed by other researchers, but they have the demerits that the system configuration and/or the calculation scheme is complex and that it is difficult to cope with a rapid change of the inductance. Although the authors are studying a position sensorless control in all speed ranges in synchronous reluctance motors, first the method which can drive in steady in more than 10% of rating speed has been investigated. The method is characterized by the calculation scheme for the position estimation and the use of the inductance table for stable speed control. In this paper, the merits of the proposal position calculation scheme and using the inductance table are shown theoretically and through experiments.

34    T. Manmek, C. Grantham, T. Phung, "A new efficient algorithm for online measurement of power system quantities," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1184- 1189 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an alternative approach for real time measurement of all electrical quantities in a power system signal based on a new least squares algorithm. The advantage of this approach is that the least squares algorithm is an easy to understand, fast and cheap method that can be applied to track changes in power system quantities rapidly. The technique can be used to accurately evaluate the rms voltage and rms current magnitudes and phase angle of each harmonic component directly from single measurements of the voltage and current. Once these values have been evaluated all other quantities such as average power and power factor can be readily calculated. Computer simulation is used to evaluate the algorithm's accuracy. The results confirm the structural robustness of the proposed algorithm with respect to noise and distortions in the waveforms being measured.

35    Dong Hwa Kim, Jae Hoon Cho, "Parameter estimation of a squirrel-double cage induction motor using clonal selection of immune algorithm," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1190- 1194 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper suggests the techniques in determining the values of the steady-state equivalent circuit parameters of a three-phase squirrel-cage induction machine using immune algorithm. The parameter estimation procedure is based on the steady state phase current versus slip and input power versus slip characteristics. The proposed estimation algorithm is of a nonlinear kind based on clonal selection in immune algorithm. The machine parameters are obtained as the solution of a minimization of least-squares cost function by immune algorithm. Simulation shows better results than the conventional approaches.

36    Rong-Jong Wai, Jeng-Dao Lee, "Voltage-source resonant inverters for linear piezoelectric ceramic motor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1195- 1200 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This article presents a comparison study of three voltage-source resonant driving schemes including an inductance-capacitance (LC) resonant inverter, an LLCC-resonant inverter and a LC-resonant inverter with energy feedback for a linear piezoelectric ceramic motor (LPCM). The effectiveness of three reported driving strategies is verified by numerical analyses and experimental results under the variation of loads. By way of experimental validation, the newly designed LC-resonant inverter with energy feedback for driving the LPCM possesses good performances of high voltage gain and invariant output characteristic.

37    K.B. Dalci, K. Gulez, G. Cansever, "The design of a push-pull switch mode power supply for AC drives," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1201- 1206 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this study, the step up DC-DC converter that works in push-pull connection has been taken up. The voltage-drops that occurred since input voltage was low, have been minimized. The IRF 1310N MOSFET, which had minimum conduction resistance, was preferred when we were selecting semiconductor elements used for voltage-drop minimization. As the current value switched in converter was high, the current capacity was increased by connecting the mosfets as parallel. At the same time the voltage-drop occurred on semiconductor element, was minimized. Switching mode power supply at 28 kHz is capable of providing 380 Watt. It gives the input power from a standard 12 volt battery, and its output voltage is 311 V. As the realized converter has the closed loop feature, output voltage remains stable within determined power limits. When the converter is used as pre-circuit of the inverter, it simplifies the control cards highly as the inverter input voltage remains constant. Converter design shows that theoretical analyses and experimental results are in accordance with.

38    R. Champagne, Hoang Le-Huy, L.-A. Dessaint, P. Brunelle, "A new simulation tool for the design of systems with electric drives," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1207- 1211 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a powerful new simulation tool aimed at helping engineers design electric drives. The proposed drives library contains models for the most popular AC and DC drives found in industrial applications, and also contains mechanical coupling models used to connect mechanical load models to the drive models. The library's open architecture enables users to use each model as is or customize it to suit specific needs. After describing the models included in the library, usability enhancing characteristics of the tool are discussed and a case study Is presented to demonstrate the tool's abilities.

39    A. Bellini, C. Concari, G. Franceschini, A. Toscani, "Mixed mode PWM for high performance stepping motors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1212- 1217 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the realization of a high performance drive based on stepping motors, with specific reference to the optimal choice of PWM modulation. An original modulation technique is proposed that allows to achieve high performances together with a reduced current ripple. A prototype DSP based drive was realized for a small size stepping motor.

40    I.M. de Alegria, J. Andreu, P. Ibanez, J.L. Villate, I. Gabiola, "Novel power error vector control for wind turbine with doubly fed induction generator," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1218- 1223 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a new control method for a doubly fed induction generator. The control is suited for variable speed operation where stator active and reactive power control is required, especially in wind power generation with variable-speed wind turbine. The control is similar to DTC controllers but significantly simplifies the determination of the rotor voltage vector to be applied. The stator active and reactive power errors are directly translated into a reference vector that determines the rotor voltage vector without the need of subsynchronous or supersynchronous operation detection or rotor flux sector detection. This control method, called power error vector control, is less complex and obtains similar results to direct power control. This is supported by theoretical analysis, and verified by simulation results. A test rig is being built to experimentally test the algorithm.

41    N.P. Filho, J.O.P. Pinto, L.E. Borges da Silva, B.K. Bose, "A simple and ultra-fast DSP-based space vector PWM algorithm and its implementation on a two-level inverter covering undermodulation and overmodulation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1224- 1229 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper proposes a simplified algorithm of space vector modulation (SVM) for a two-level voltage-fed inverter. The algorithm is faster and more flexible than any other algorithm so far proposed in the literature. Another relevant advantage of this approach is that a single algorithm covers the undermodulation and overmodulation regions including the square-wave operation with almost no additional computation cost The simplification of the algorithm is achieved by exploring (1) the coupling between the angle and amplitude of the command voltage vector in the final result of the algorithm, (2) extrapolation of the undermodulation strategy into the overmodulation region, (3) reduction of the number of equations to calculate the switching times, and (4) simplification of the sector identification strategy. As a result, the algorithm can be implemented by using only basic mathematical operators (addition, subtraction and multiplication), Boolean logical operators, and a small one-dimensional look-up table. This simplified algorithm permits SVM implementation at higher switching frequency without loosing any good features of the conventional SVM algorithm. Matlab/Simulink simulation results and laboratory experimental results using DSP type TMS320F240 for a Volts/Hz controlled induction motor drive with 20 kHz switching frequency indicate excellent performance of the system.

42    Zhilin Feng, Jianwei Yin, Jinxiang Dong, "A novel segmentation algorithm for noisy jacquard images based on finite element technique," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1230- 1234 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Automatic pattern segmentation of jacquard images plays an important role in jacquard pattern analysis. This paper deals with the problem of low accuracy in segmentation of jacquard images under noisy environment A novel iterative relaxation algorithm based on Mumford-Shah model was proposed. In this algorithm, the Mumford-Shah model was approximated in the sense of /spl Gamma/-convergence by a sequence of discrete models defined on finite element spaces of adaptive triangulation. During each iteration, an adjustment procedure for the triangulation was enforced to characterize the essential contour structure of a jacquard pattern. A quasi-Newton algorithm was applied to find the absolute minimum of the discrete model at the current iteration. Experimental results on synthetic and jacquard images have shown the effectiveness and robustness of the algorithm.

43    Sungjin Kim, Seungjoon Choi, Sangchul Won, Hong Jeong, "The coil recognition system for an unmanned crane using stereo vision," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1235- 1239 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In steel works, there is a need to know where is a coil in a yard for an unmanned crane operation. Image based vision processing can be effective in detecting important geometrical features of an object and lead to accurate estimation of the object's position/orientation required for pickup operations such as a crane. In this paper, we investigate techniques for recognizing the coil's position/orientation with established a 3D map by stereo vision system which is implemented on FPGA chips and generates disparity values from stereo camera images at high speed. In order to recognize the coil's position/orientation, a surface segmentation technique is used. Our system is tested at coil yard in steel works for an unmanned crane.

44    Jianing Zhu, M. Minami, "Finding and quantitative evaluation of minute flaws on metal surface using hairline," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1240- 1245 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this research, a method to detect minute flaws on metal parts is proposed to remove the defective parts before assembling in a factory. The input gray-scale images of metal parts are used directly to recognize the flaw without any image conversion to shorten the recognition time. The recognition problem to find flaws and detect its position on the metal parts is converted here to another problem to search for the maximum peak and the variables giving the peak. Then the recognition problem can be treated as optimization problem, and this conversion allow us to utilize the high performances of GA in the optimization. The effectiveness and problems of proposed method are studied on standing points of the recognition speed and the quantitative recognition ability. Based on the analysis, we furthermore improved our system to increase the detection rate of the flaws, that is, the lighting direction is changed to find the best lighting condition that can emphasize the contrast between the metal surface and the bruise by using the reflection character of the hairline on the metal resulted by polishing process.

45    Ku Chin Lin, "On the development of a visual inspection system for golf logos. Part II -degradation measure of individual logo contour," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1246- 1251 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a preliminary work on development of a visual inspection system for golf logos. A measure is proposed to detect degradation of logo contour with extrusion and/or intrusion. Mathematic framework of the proposed degradation measure is explained in detail. Hierarchical convexity rule and normalized feature vector are employed to deal with the correspondence problem. Integration of both approaches is proposed to determine the characteristic vertices between sample and test logo contours. A new concept of expansion of contour sub-chains by interpolation is introduced. A masking window is also introduced to enforce the robustness of the proposed measure against disturbances. Lots of experimental and simulation examples have been conducted to support the adequacy of the proposed measure, but only a typical example is presented for demonstration.

46    H. Fujiwara, Zhong Zhang, H. Hatta, H. Koshimizu, "Visual inspection of textile surfaces with translation invariant wavelet shrinkage," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1252- 1257 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A visual inspection method of textile surfaces using the translation invariant wavelet shrinkage is presented. The wavelet transform, while the Mallat algorithm can compute it efficiently, has the translation variance problem. To deal with this problem, we use RI-spline wavelets, which are pseudo complex wavelets, consist of a pair of a symmetric bi-orthogonal spline wavelet and an anti-symmetric bi-orthogonal spline wavelet, for textile surface inspection. In our approach, we remove the regular information which consists of the textile textures and the shading effects caused by uneven lighting from the textile surfaces to be inspected, using the translation invariant wavelet shrinkage realized using 2D RI-spline wavelets. The experimental results show that our inspection method is effective for detecting tiny defects as well as global defects such as dyeing unevenness.

47    Jong Woog Kim, Jong Wha Chong, "A fast parallel VLSI architecture for lifting based 2-D discrete wavelet transform," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1258- 1262 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose a parallel hardware architecture for 2-D discrete wavelet transform (DWT) based on the lifting scheme. The architecture is consisted with two row processors and one column processor. The proposed architecture has the 4-way data scheduling, which decreased the initial latency of column direction transform. The transform results of the row processors are directly feed to the column processor, and this method can reduce the internal memory, which stored row processor's results. The column processor, which has the buffer memory to store the filter's intermediate values, can calculate the filter values every clock cycles. This architecture shows that the internal memory size is reduced with around 30% compare to the previous works, and total computational timing improved to N/sup 2//4+a. Finally, the architecture has been implemented in behavioral VHDL. The estimated timing of the maximum clock is 100 MHz in altera stratix device.

48    R. Mita, G. Palumbo, S. Cavalieri, A. Palumbo, "Hardware implementation of a fault recovery protocol compliant with interbus-S standard," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1263- 1267 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper the authors present an hardware implementation of interbus-S protocol sub-blocks which include an extension of the protocol that manage the fault recovery capability. The fault recovery protocol is based on the definition of a novel device called master/slave able to recover any occurring fault. The master/slave device will be implemented into an FPGA chip. It contains the physical layer and a portion of data link and they are described through VHDL language. Gate level simulations are carried out to verify the functionality and compatibility with interbus-S of the fault recovery protocol.

49    K.F. Man, T.M. Chan, K.S. Tang, S. Kwong, "Jumping-genes in evolutionary computing," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1268- 1272 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new jumping genes paradigm is proposed for evolutionary computing. It is speedy and yet capable of generating some extreme solutions within the Pareto front. This algorithm emulates the genetic phenomenon of horizontal transmission in which the genes can be jumped from one position to another position either within its own or the other chromosome. This paper describes the concept, methodology and implementation of the algorithm that can be aptly used for evolutionary computing. The performance in simulation based on some standard test functions has demonstrated its effectiveness in multiobjective optimization and its results also have been compared with other algorithms currently in use.

50    S.H. Ling, F.H.F. Leung, H.K. Lam, "Genetic algorithm based variable-structure neural network and its industrial application," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1273- 1278 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a neural network model with a variable structure, which is trained by an improved genetic algorithm (GA). The proposed variable-structure neural network (VSNN) consists of a neural network with link switches (NNLS) and a network switch controller (NSC). In the NNLS, switches in its links between the hidden and output layers are introduced. By introducing the NSC to control the switches in the NNLS, the proposed neural network can model different input patterns with variable network structures. The proposed network gives better results and increased learning ability than conventional feed-forward neural networks. An industrial application on short-term load forecasting in Hong Kong is given to illustrate the merits of the proposed network.

51    Yuncan Xue, Qiwen Yang, Wei Jian, "Improved genetic algorithm with adaptive operators for integrated steelmaking optimum cast plan," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1279- 1283 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The shortcoming of the standard genetic algorithm is analysed. An improved genetic algorithm with modified mutation operator and adaptive probabilities of crossover and mutation is proposed. Simulation experiments have been carried and the results show that the modifications are very effective. In this paper, a planning method of cast for steelmaking continuous casting production scheduling in CIMS is also studied. The cast plan model is established. The modified genetic algorithm is used to solve the optimum cast plan problem. The computation with practical data shows that the model and the solving method are very effective.

52    M. Niitsuma, H. Hashimoto, A. Watanabe, "Spatial human interface in working environment - spatial-knowledge-tags to access memory of activity," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1284- 1288 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The spatial human interface (SHI) is a relatively new system that enables us to facilitate human activity in a working environment. The SHI stores human activity data as knowledge and activity history of human into the spatial memory in a working environment as three-dimensional space where one acts, and loads them with the spatial-knowledge-tags (SKT) by supporting the enhancement of human activity. To realize this, the SHI purpose is to construct a new relationship among human and distributed networks computers and sensors that is based on intuitive and simultaneous interactions. In this paper, the specified functions of SKT and the realization method of SKT are explained. The experimental results using SKT are shown.

53    Soohee Han, Wook Hyun Kwon, "Receding horizon finite memory controls for output feedback controls of discrete-time state space models," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1289- 1294 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new type of output feedback control, called a receding horizon finite memory control (RHFMC), is proposed for stochastic discrete-time state space systems. Constraints such as linearity and finite memory structure with respect to an input and an output, and unbiasedness from the optimal state feedback control are required in advance. The proposed RHFMC is chosen to minimize an optimal criterion with these constraints. The RHFMC is obtained in an explicit closed form using the output and input information on the recent time interval. It is shown that the RHFMC consists of a receding horizon control and an FIR filter. The stability of the RHFMC is investigated for stochastic systems.

54    K. Alimhan, H. Inaba, "Global stabilization of a class of uncertain nonlinear systems using output feedback," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1295- 1298 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper studies the global stabilization by output feedback for uncertain nonlinear systems whose dynamic may not exactly known but satisfies some relaxed triangular-type conditions. Using a feedback domination design method, we explicitly construct a dynamic output compensator, which globally stabilizes such an uncertain nonlinear system. The usefulness of our result is illustrated as an example.

55    K. Witheephanich, W. Piyarat, C. Tarasantisuk, "Representations of robustly stabilizing controller structure for distributed control architectures with plant uncertainties," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1299- 1303 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: There is increasing interest in controlling systems over communication networks. Using a robust model following control (RMFC) scheme, this paper proposes robustly stabilizing loop controller designed and then added to local location of a distributed system to cope with the plant uncertainties. A systematic design methodology is established and it is linked to the conventional control system design. The robust loop controller designs for differently distributed architectures are shown to illustrate the benefits of the proposed technique with a number of simulation examples.

56    Qiwen Yang, Yuncan Xue, Qiuling Wu, "Stabilization and robust control of a class of processes with long time delay," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1304- 1308 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A compound P+I control system is presented to deal with the control of stable process with long time delay in this paper. An extension of the Hermite Biehler theorem applicable to quasi polynomials is used to stabilize the proposed system. The robustness of the system is analyzed. The system responds to the setpoint as quickly as the Smith-predictor-based control system. But it is less sensitive to the model uncertainty even the mismatch of parameters is up to 10 times.

57    K. Tsumoto, H. Yabuno, N. Aoshima, "Passive stabilization of a buckled beam (linear theoretical analysis)," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1309- 1311 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Beam is one of the fundamental elements in complex structures. It is very significant to clarify its stability under the various circumstances. In particular, the buckling phenomenon, which is a pitchfork bifurcation, has accepted much interest by many researchers. In this paper, we propose a stabilization control method for the first-mode buckling phenomenon in the clamped-clamped beam without feedback control, We analyze a buckled beam under high frequency excitation in linear theory. The high frequency excitation shifts the bifurcation point (the critical compressive force) and carries out the escape from the buckling state.

58    M. Iwase, Y. Suzuki, S. Hatakeyama, "Stabilization of chaotic behavior to limit cycle in hybrid system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1312- 1317 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, it is presented that chaotic behavior appears in some hybrid system. Analyses and stabilization of the chaotic behavior are also discussed. The incidence condition of the chaotic behavior in the hybrid system is discussed from the chaos system point of view. This condition can be related with the location of poles and zeros of the system. Using the result of the analysis, a control method stabilizing the chaotic behavior to the limit cycle is presented. In this method, an adequate impulse input is injected to the system in order to stabilize the system when some discrete events occur. The effectiveness of the method is verified through numerical simulations, and robustness of the method will be shown in the simulation results.

59    Niaona Zhang, Yong Feng, Xinghuo Yu, "Optimization of terminal sliding control for two-link flexible manipulators," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1318- 1322 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A terminal sliding mode controller is proposed for a two-link flexible manipulator to address its non-minimum phase characteristics using the output redefinition method. The manipulator is decomposed into two parts by input-output linearization, namely, an input-output subsystem and the zero dynamics respectively. A terminal sliding mode control strategy is designed to make the input-output subsystem converge to their equilibrium points in finite time. The relationship between the eigenvalues of the zero dynamics and the parameters of the redefined output is obtained. The parameters of the controller are optimized using a chaos based genetic algorithm to guarantee the zero dynamics to be asymptotically stable at equilibrium points, and thus guarantee that the entire flexible manipulator system is asymptotically stable. Simulation results are presented to validate the design.

60    Junfeng Xu, Fengyan Wang, Jianghua Feng, Jianping Xu, "Flux-weakening control of permanent magnet synchronous motor with direct torque control consideration variation of parameters," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1323- 1326 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Flux-weakening control of interior permanent magnet synchronous motor (PMSM) is elaborated by presentation of current limit trajectory, speed limit trajectory and load angel limit trajectory. Flux-weakening control extends the timing range of the motor. For PMSM, flux-weakening is realized by armature reaction, which is different from induction motor by reducing the flux directly. In flux-weakening range, armature reaction will seriously affect the parameters such as rotor flux, direct axis inductance and quadrature axis inductance. The control trajectories mentioned above and performance of flux-weakening control with and without considering armature reaction are compared realized by MATLAB/SIMULINK. The rationality of theory analysis has been proved by simulation results.

61    K. Veszpremi, "Comprehensive optimization of brushless excitation of synchronous machine," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1327- 1332 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Brushless excitation of wound rotor machines has an attractive property: the slip-rings can be omitted. Different methods are developed; this paper investigates the rotating transformer method, where the excitation machine is a wound rotor induction machine supplied by an excitation converter. The excitation circuit of the synchronous machine is connected to the three-phase rotor of the excitation machine through a diode bridge rectifier. One optimization is the proper selection of the power circuit for the excitation converter. The PWM AC chopper is proposed, providing almost sinusoidal supply for the excitation machine. In this case the operation of the system is essentially determined by the commutation of the rotating diode bridge. It has different working regions, which should be considered. A model is developed to investigate the characteristics of the steady-state operation. Optimization related to the utilization of the excitation machine is introduced and generalized, providing a complex design method for the components and the control of the system. The overall efficiency of the excitation system is also investigated and found to be slip-dependent.

62    J.W. Park, K.W. Lee, H.J. Lee, "Wide speed operation of a doubly-fed induction generator for tidal current energy," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1333- 1338 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For the development of renewable energy, the control of active and reactive power in a doubly fed induction generator was studied. And to expand operation range of that, a control method that takes into account the apparent power is proposed. The characteristic was verified by an experiment that applied a dual direction AC/DC/AC electrical power converter to a 10 kW DFIG.

63    Joon-Ho Lee, Tae-Sung Kim, Dong-Seok Hyun, "A study for improved of speed response characteristic in four-switch three-phase BLDC motor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1339- 1343 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new speed control method using the acceleration feedforward compensation and using the disturbance torque estimate method. The proposed method improve transition response characteristic of system and has been a robust characteristic in the four-switch three-phase motor drive system in which the gain of speed controller cannot be made large enough. The simulation results prove the validity of the proposed method.

64    Chang Hee Cho, Min Kook Park, Jong Bo Ahn, Soon Man Kwon, Sung Shin Kim, "Development of the power control system for the parallel operation of multiple diesel engine generators," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1344- 1348 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Reliable electric power is no longer something we can take for granted. The news of catastrophic blackouts at California in 2002 was a good example of how disruptive power problems can be to the entire society, and how important a backup power generator can be to every individual. As a counter measure to this electrical interruption, the emergency engine generator is mainly used as an independent backup power source. However, the demands for more efficient, peak shaving, and co-generation system have increased the necessities for the general purpose, multi-functional power control system of the engine generator system. In this paper, we will see the feature of newly developed digital power control system for multiple engine generators including HMI (human machine interface) system.

65    S. Vamsidhar, B.G. Fernandas, "Design and development of energy efficient sensorless direct torque controlled induction motor drive based on real time simulation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1349- 1354 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents energy efficient direct torque controlled sensorless induction motor drive using space vector modulation. The entire design and optimisation of controller parameters of the drive is carried out using hardware-in-the-loop (HIL) simulation. The simulation is performed in real time using TMS320F240 digital signal processor. The dynamic machine model with 5 state variables is solved in real time to determine the state variables. These variables are then used to estimate the various output quantities. Using the same controller and software used in HIL simulation, and with additional signal conditioning interface circuitry, the results obtained from real time simulation are experimentally validated on a 1.5-kW induction motor drive. A simple method based on minimum average input power is proposed to determine the optimal flux reference at light loads. A method for online-controller parameter tuning is also proposed so as to have an optimal dynamic as well as steady state performance.

66    M. Tsuji, S. Chen, S. Hamasaki, F. Sato, M. Tursini, "A precise torque and high efficiency control for induction motor vector control system taking into account iron loss," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1355- 1360 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel torque control method for a vector-controlled induction motor taking into account iron loss. By using a phase lag current control, both current control and parameter identification are well realized. The proposed system is simple and contains a conventional slip frequency type vector control as a special case. Furthermore, a high efficiency control method that minimizes the loss is proposed. The effectiveness of the proposed system is verified by digital simulation and experimentation.

67    I. Ando, M. Sazawa, K. Ohishi, "High efficient speed control of parallel-connected induction motors with unbalanced load condition using one inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1361- 1366 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, the parallel speed control of two induction motors, which uses only one inverter, has been proposed by the vector control method. However, the conventional control method does not consider both the efficiency of the motor control and condition of different load torque to each induction motor (IM). This paper proposes a new high efficient parallel speed control method, which calculations the optimal voltage and frequency value based on non-linear programming method, even when two induction motors on condition different load torque. The non-linear programming method requires the information on load torque and speed reference. Each load torque is estimated by disturbance observer with current simulator and flux simulator. The IM driven system requests only speed sensor using rotary encoder. Hence, it has no current sensor and no voltage sensor. The experimental results point out that both induction motors keep the near same speed control performance with high efficiency in the steady state and the transient state, on condition of different load torque.

68    A. Bellini, M. Cavatorta, C. Concari, E. Lorenzani, C. Tassoni, A. Toscani, "Experimental validation of a robust diagnostic index for induction motors stator faults," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1367- 1373 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Motor current signature analysis (MCSA) is used for non-invasive diagnosis of incipient or actual faults of grid supplied induction machine stator defects, being the negative sequence component of current space vector the diagnostic index most widely used. Supply unbalance and load influence of the machine however affect the negative component and they may cause the failure of the diagnostic procedure. Recently, deceleration test that may remove some drawbacks of MCSA has been proposed for rotor and stator fault diagnosis. In this paper it is shown that the residual voltage signature analysis (RVSA) obtained by the deceleration test provides, once removed the intrinsic manufacturing asymmetry, a diagnostic index directly related to the percentage of shorted turns. The main advantage of RVSA is that any influence caused by the supply unbalance and load is masked. Therefore a new diagnostic index is presented that is the residual voltage negative sequence component. The novel index performances have been proofed thanks to a simplified model of the faulted machine and experimentally validated by a special test motor that allows the introduction of different short circuits. This novel index can be used to confirm the MCSA-based diagnostic procedure developed by the same authors.

69    Yong Ho Yoon, Mu Sun Woo, Seung Jun Lee, Chung Yuen Won, You Young Choe, "Speed control system of slotless PM brushless DC motor using 2Hall-ICs," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1374- 1379 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The high performance drives of the slotless permanent magnet brushless DC (PM BLDC) motor can be achieved by the current control, where the currents flow according to the rotor position and the current phase is suitably controlled according to the operation condition. The inexpensive Hall-ICs are a right choice or the so-called back EMF sensorless algorithm can be used for the rotor position sensing. Generally, to drive and control of the PM BLDC, it is necessary that the three Hall-ICs evenly be distributed around the stator circumference and encoder be installed in case of the 3 phase motor. So, the Hall-ICs are set up in this motor to detect the main flux from the rotor, and the output signal from Hall-ICs is used to drive a power transistor to control the winding current. However, instead of using three Hall-ICs and encoder, we used only two Hall-ICs for the permanent magnet rotor position and for the speed feedback signals, and also for a microcontroller of 16-bit type (80C196KC) with the 3 phase PM BLDC whose six stator and two rotor designed. Two Hall-ICs CS1 and CS2 are placed on the endplate at 120 degree intervals, and with these elements, we estimated information of the others phase in sequence through a revolving rotor.

70    Mu Sun Woo, Yong Ho Yoon, Seung Jun Lee, Chung Yuen Won, You Young Choe, "Comparison of characteristics using two Hall-ICs and one Hall-IC for 3 phase slotless PM brushless DC motor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1380- 1384 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Slotless permanent magnet brushless DC motor (slotless PM BLDC motor) with the characteristics of high speed and high power density has been more widely used in industrial and automatic machine. Generally, because the position sensor represents the important factor in PM BLDC motor drives, slotless PM BLDC motor is necessary that the three Hall-ICs evenly be distributed around the stator circumference in case of the 3 phase motor. The Hall-ICs are set up in this motor to detect the main flux from the rotor. So the output signal from Hall-ICs is used to drive a power transistor to control the stator winding current. However, instead of using three Hall-ICs, though we used two Hall-ICs or one Hall-IC, we estimate information of the others phase in sequence through a revolving rotor. This paper compared the characteristics and performance by using three, two Hall-ICs and one Hall-IC for the 3 phase PM BLDC whose six stator and two rotor designed.

71    Ma Shaohua, Cai Zhiyuan, Li Peng, Li Wei, Wang Jian, "Multifunction integrated low voltage apparatus," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1385- 1390 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel multifunction integrated low voltage apparatus is presented in this paper. Although its appearance looks a contactor, its contact and arcing chamber is innovated and power electronic technology is tied with its electromagnetic system so as to improve effectively the apparatus's making and breaking current capability, furthermore, microcontroller is imbedded in the apparatus as its measure and control core. As a result, it is provided with several apparatus's functions including contractor, circuit breaker, thermal relay and so on. The static characteristics and dynamical characteristics of the electromagnetic system is computed and analyzed based on finite element method by means of the ANASY software in this paper, the influence of counterforce, coil diameter and number of windings for the breaking velocity and resetting time during switch-off is studied. And the prototypes have been tested and put to use, the results show a good agreement with the predictions.

72    S. Kaboli, M.R. Zolghadri, D. Roye, A. Emadi, "Online optimal flux controller for DTC based induction motor drives," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1391- 1395 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A flux search controller is proposed to achieve the best efficiency in a direct torque controlled induction motor with light load. The reference flux value is determined through a minimization algorithm with stator current as objective function. Experimental results show that using motor current instead of motor input power as the objective function causes better performance.

73    Don-Ha Hwang, Ki-Chang Lee, Do-Hyun Kang, Yong-Joo Kim, Kyeong-Ho Choi, Doh-Young Park, "An modular-type axial-flux permanent magnet synchronous generator for gearless wind power systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1396- 1399 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the design and characteristics analysis of dual axial-flux permanent magnet synchronous generator, 60 |Hz|, 10 |kVA|, 300 |rpm| for wind energy system application are presented. The dual axial-flux generator has inherently desirable features such as; (1) by employing two air gaps, the rotor-stator attractive forces are balanced and no net axial or thrust load is applied on the generator bearings; (2) heat produced by the stator windings appears on the outside of the generator, and it is easy to remove the heat. This paper describes characteristics of a dual axial-flux type permanent-magnet generator for a gearless wind energy system, which aims to satisfy the variable operating conditions. Finite-element method (FEM) is applied to analyze generator performance at variable loads. The results of FE analysis show this generator has a promising future for wind turbine applications.

74    V.V. Pankratov, Y.A. Zima, G.S. Zinoviev, Hong-Hee Lee, "New approach to energy efficient control of induction motor drives," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1400- 1404 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new approach to the structural synthesis of field-oriented control algorithms for induction motor electric drives has been developed. This approach allows combining energy efficient control with the speed of response sufficient for industrial electric drives. The basic control algorithms and simulation results have been presented. The control algorithms are implemented by voltage source inverters (VSI) with PWM. It results in the increase of the current effective value due to the harmonics. Three PWM techniques (classical, with addition of the third harmonic, forming of a linear voltage of VSI) have been compared by the total harmonic distortion of the current.

75    Yang Geng, Geng Hua, Wang Huangang, Guo Pengyi, "A novel control strategy of induction motors for the optimization of both efficiency and torque response," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1405- 1410 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel control strategy for the optimization of both energy efficiency and torque response of the induction motor system. The strategy combines the method of field oriented control with decoupled control on synchronously rotating reference frame. Furthermore, the torque command of the torque loop is set based on the idea of optimizing slip control and maximum torque per ampere control. As the results, the torque controller not only improves the efficiency of induction motors both in steady and transient states, but also provides good torque response. Analysis and simulation results confirm the validity of the strategy.

76    S. Gallardo, J.M. Carrasco, E. Galvan, L.G. Franquelo, "DSP-based doubly fed induction generator test bench using a back-to-back PWM converter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1411- 1416 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Present paper describes the design of a doubly fed induction generator (DFIG) test bench with active crowbar, using PWM voltage-fed inverters connected between the grid and the rotor. A vector-control scheme is proposed in order to control the power-side and the rotor-side of the converter. A control board, based on a digital signal processor (DSP) and a FPGA, has been developed to manage the overall equipment. Real-time system supervision is implemented by a monitor program.

77    N.M. Abdel-Rahim, A.A. Shaltout, "Slip-frequency control of single-phase induction motor operated as two-phase motor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1417- 1422 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a closed-loop control strategy to operate an off-the-shelf single-phase induction motor (I.M.) as an unsymmetrical two-phase motor. The proposed control strategy employs the slip frequency control technique to independently control the stator currents of both main and auxiliary windings and make them follow a predefined sinusoidal wave. Simulation results show that the proposed scheme is successful in operating the single-phase induction motor as an unsymmetrical two-phase motor with fast dynamic and transient responses. Notably, the proposed control scheme achieves reduction in the inherent torque oscillations of the two-phase unsymmetrical I.M, rendering its behavior similar to its symmetrical counterpart. In addition, the proposed control system achieves cost-effectiveness in both initial and running costs. Thus, the proposed work presents a novel cost-effective control and application of the single-phase induction motor.

78    E. Leksono, Pratikto, "Adaptive speed control of induction motor with DSP implementation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1423- 1428 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a simple adaptive speed control of induction motor is described and implemented using dedicated digital signal processor (DSP). The controller-structure design is based on vector control scheme that transforms the three phase motor currents into flux and torque generating current components. Using these current components, the AC induction motor can be handled in the similar way with that of DC motor. Hence, the motor control system consists of flux control loop and torque control loop. To realize the speed controller, the torque reference is calculated as the output of speed controller. The inner current control loops are realized with proportional and integral controllers while for the outer loop, the adaptive controller derivation is based on a class of model reference adaptive controller (MRAC) where the reference model is chose as first order system. From the experimental results, it is shown that the overall induction motor control system gives good transient and steady state responses tracks the motion profile given to the system.

79    Hao Ma, Zheng Cai, "Comparison of control strategies for active power filter in three-phase four-wire systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1429- 1434 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper analyzed three control strategies (direct power control, per-phase harmonic reference generation method, conventional Ip-Iq method) for active power filters in three-phase four-wire systems. They were applied to a 4-leg inverter to compensate input currents of an office building. Differences in harmonic detecting and switching sequence generation of these three control strategies were analyzed. Per-phase harmonic reference generation control is used to reduce capacity of dc bus capacitor. Direct power control is designed for better harmonic compensation as well as smaller power capacity. The simulation results are presented to substantiate the theoretical analyses.

80    Fei Liu, Yunping Zou, Kai Ding, Xianglian Xu, "A novel combined control algorithm for the hybrid active power filter applied to high voltage grid," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1435- 1439 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presented a novel combined control algorithm for the hybrid active power filter (APF) applied to high voltage grid. The algorithm can meet the requirements of control stability and harmonic compensation effect at the same time. With the proposed control strategy, the hybrid APF can compensate some appointed load harmonic accurately and compensate other harmonic partially, it can also damp the possible resonance between the grid impedance and filter. The algorithm is characterized by filtering performance and easy realization, and is suitable for harmonic compensation in high voltage system. Theoretical analysis is verified by simulation and experimental results.

81    Li Min, Yu Hongxiang, Ji Yanchao, Tan Guanghui, "Novel multi-mode active power quality conditioner for series voltage compensation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1440- 1445 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel multi-mode active power quality conditioner (MAPQC) for series voltage compensation is proposed. In the MAPQC, an improved single-phase full bridge circuit is developed to perform both flexible compensation of line voltage and crucial energy balance at DC side. Moreover, two small backup batteries are implemented to smooth temporary voltage fluctuation at DC side; hence the actions of the pulse width modulation (PWM) rectifier are efficiently reduced. The control signal is directly derived from the instantaneous voltage value of ac mains without processing harmonic frequency. Thus the MAPQC can work in simple open-loop state, which ensures high-speed and precise response to harmonic voltage distortion and load voltage excursion. Compared with previous methods, this scheme is simpler and more economical in practice. Operation principles and realization of the new MAPQC are discussed in detail. Experimental results obtained from a 2 kVA prototype show that it has good performance in quality power supplying applications.

82    F. Hernandez, L. Moran, J. Espinoza, J. Dixon, "A multilevel active front-end rectifier with current harmonic compensation capability," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1446- 1451 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a multilevel active front-end rectifier that can absorb current harmonics generated by nonlinear loads connected to the same power distribution bus. That is, the proposed active front-end converter can operate as an active power filter and simultaneously as a rectifier. The control scheme is simple and forces the power system line current to be sinusoidal and in phase with the respective phase to neutral voltage, and is designed for the application in multilevel rectifiers. The control scheme is described in terms of principles of operations, dynamic modeling, and design. Simulated results are tested for steady state and transient operating conditions on a 10 kVA laboratory prototype.

83    Shaofeng Xie, Shipai Gao, Qunzhan Li, "Study on measurement methods of harmonic of traction load," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1452- 1457 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Traction load is one of the main harmonic sources in utility. The harmonic of traction load is very complex because of its random variety characteristic. The exact measurement of traction load harmonic is the precondition of finding out harmonic characteristic and harmonic compensation. IEC61000-4-7 is an international standard about how to measure harmonic and inter-harmonic of utility. Based on analysis of recorded harmonic data of traction load using measurement methods defined in IEC61000-4-7, comparison of many measurement methods of harmonics are done in this paper. The best suitable method for measuring harmonic of traction load in IEC61000-4-7 is also put forward in this paper. This study has great significance on measuring precision of traction load harmonic.

84    Nguyen-Van Nho, Myung-Bok Kim, Gun-Woo Moon, Myung-Joong Youn, "A novel carrier based PWM method in three phase four wire inverters," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1458- 1462 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new carrier based PWM method to control the three phase four wire inverters. An equivalent circuit model of two-level inverter has been proposed, presenting a redundancy function in the zero sequence voltage. Its application has been used to explain simply the characteristics of the three phase four wire inverter topologies. The advantage from this method is a simple and flexible PWM control, and its possible applications to higher level inverters. Several specific characteristics have been also introduced.

85    Sang-Hoon Song, Su-Jin Jang, Hyo-Jin Bang, Chung-Yuen Won, "Regeneration inverter system for DC traction with harmonic reduction capability," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1463- 1468 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a DC power system, which can generate the excessive DC power form DC bus line to AC source in substations for traction system. The proposed regeneration inverter system for DC traction can be used as both an inverter and an active power filter (APF). As a regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation. From the viewpoint of both power capacity and switching losses, the system is designed on the basis of three phase PWM inverters and composed of parallel inverter system, output transformers and an LCL filter.

86    A. Esfandiari, M. Parniani, H. Mokhtari, "Mitigation of electric arc furnace disturbances using the unified power quality conditioner," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1469- 1474 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper discusses the application of unified power quality conditioner (UPQC) for improving power quality of a system supplying an electric arc furnace (EAF). The UPQC comprises combined series and shunt active filters sharing a common DC link. It is used to mitigate voltage disturbances and compensate for reactive power, harmonics and interharmonics. A novel control strategy of the UPQC is presented. Since voltages at the point of common coupling (PCC) contain low frequency interharmonics, conventional methods cannot be used for extracting voltage reference signals. In the proposed method, voltage references are extracted using active power processing to generate sinusoidal waveforms. Current compensating signals are detected based on current vector mapping on a rotating reference frame constituted by instantaneous phase voltages. A real system is simulated using a three-phase EAF model. Simulation results are presented to verify the control strategy and to assess the performance of UPQC in improving quality of power.

87    Yen-Shin Lai, S.R. Bowes, "Optimal bus-clamped PWM techniques for three-phase motor drives," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1475- 1480 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents optimal bus-clamped pulse-width modulation (PWM) techniques for three-phase motor drives. The techniques are developed from the viewpoint of per-phase modulation by minimizing the switching loss factor (SLF) [H.W. van der Broeck, 1991], which reflects the inverter switching losses. It is shown that the new optimal bus-clamped PWM techniques dramatically reduce the switching losses and have the minimum switching loss factor in comparison with other existing techniques. Experimental results are presented to confirm the theoretical analysis.

88    Xiaoming Zha, Yunping Chen, "An integrated learning control method for PWM-VSI based hybrid filter to dampen harmonic resonance in industrial power system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1481- 1486 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The operation of voltage source inverter (VSI) based active filtering technique can be viewed as compensation for the equivalent harmonic voltage source according to Thevnin theorem. The paper proposes an integrated current control method for PWM-VSI based hybrid filter, which is a learning control method with incorporation of boost converter technique, to produce the control voltage of PWM inverter. During every learning period, the controller views the PWM-VSI as a boost converter to shape the line current with the achievement of almost unity power factor in the harmonic domain. The repetitive operation of learning control is used to minimize the steady error caused by uncertainties of dynamics of boost converter, the passive filters connected to power system and the detection of line harmonic current. A PWM-VSI based hybrid active filter system consisting of 11th and 13th tuned L-C passive filters with 12-pulse thyristor rectifier is examined. The simulation and experimental results show the viability and effectiveness of the proposed controller.

89    Luo Ling, Zhou Yong-peng, Xu Jin-bang, Wan Shu-yun, "Parameters self-adjusting fuzzy PI control with repetitive control algorithms for 50 Hz on-line UPS controlled by DSP," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1487- 1491 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper a hybrid parameters self-adjusting fuzzy PI with repetitive control algorithms is proposed for single-phase UPS cost effective waveform control. The control structure, the important control parameters, and the system software design are described in detail. A 50 Hz 1 kVA prototype is constructed. The core chip is TMS320F240, Experimental results prove that the proposed control scheme not only can stabilize the output sine wave of the inverter but also produce fast transient response subject to load step change.

90    A. Kumar, "Direct torque control of induction motor using imaginary switching times with 0-1-2-7 & 0-1-2 switching sequences: a comparative study," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1492- 1497 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new strategy of direct torque control of induction motor using imaginary switching times. Determination of effective time from reference voltage vector is eliminated and no requirement of sector and angle identification. Imaginary switching times are derived from flux errors of respective phases. These times are directly responsible for calculating the effective time during which the actual power flows to the motor. Also the stator resistance drop is compensated in terms of imaginary times to improve the performance. In order to further simplify the control strategy, electromagnetic torque is estimated in terms of phase quantities. Simulation results of the proposed method show the effectiveness of the new strategy. Switching sequence 0-1-2-7 (conventional sequence for first sector) is used but in order to reduce switching frequency, 0-1-2 (clamping) sequence is also presented using same program just by changing the offset time. A comparison is made between two switching sequences and concluded that clamping sequence is on leading edge as far as switching losses and performance is concerned. This control strategy guarantees very good dynamic and steady state performance with constant switching frequency.

91    Meng YongQing, Liu Zheng, Su YanMin, "A novel SVM method for three-level PWM voltage source inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1498- 1501 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel voltage space vector modulation (SVM) method for three-level PWM VSI is proposed. By proper coordinate transformation, instead of conventional voltage space vector d-q reference frame, a line voltage reference frame is used to determine the position of the reference voltage space vector, and the corresponding function time of vector can be calculated according to volt-second equivalent principle. Comparing with the conventional voltage SVM, the method is easy to be realized without complex computation and also it is very convenient to be extended for five-level and multi-level inverter. The feasibility of this new method is verified by simulation results.

92    Fang Hong-qing, Shen Zu-yi, "Dynamic real-time simulator for hydraulic turbine generating unit based on programmable computer controller," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1502- 1507 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A dynamic real-time simulator for hydraulic turbine generating unit based on programmable computer controller has been developed. The basic mathematical models of each component of the hydraulic turbine generating unit were analyzed. The hardware configuration and the software implementation of the dynamic real-time simulator were described in detail. With the simulator, the transients of the different operating conditions of the hydraulic turbine generating unit could be calculated and simulated in real-time. The performance of the hydraulic turbine governor could be test and fine-tuned whether developed in the laboratory or installed in the field. The dynamic real-time simulator also can be operated as a training system for new workers of the hydro power plant. Some simulations and field tests have been conduct with a prototype hydraulic turbine governor, and the results indicate that the dynamic real-time simulator has a good performance.

93    Wang Xiaoming, Liu Ying, Shi Wenxiang, Tang Yu, "Methods for changing distribution of magnetizing field of permanent magnet," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1508- 1513 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The magnetic parameters and the field distribution determined by the magnetizing fixture influence obviously on the performance of the permanent magnet device. The method is studied for getting the respected magnetic field distribution by the inner magnetizing fixture. The principle of analysis is represented. The influences of the magnetizing fixture designs are discussed. The results of study can be used for the optimizing design of magnetizing fixtures.

94    M.M. Jalla, A. Emadi, G.A. Williamson, B. Fahimi, "Real time state estimation of multi-converter more electric ship power systems using the generalized state space averaging method," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1514- 1519 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a real time state estimation algorithm for control and security maintenance of multi-converter MES power electronic systems. Estimation of the state variables of the system includes the effects of ripples and converter switching actions. The proposed state estimator is based on the weighted least squares (WLS) approach. Generalized state space averaging technique in which we consider the DC value of the state variables and their harmonics is used to model DC/DC converters for the state estimator. In this paper, after introducing the proposed approach and the concept of security and control assessments, results of applying the proposed method to a representative system are presented.

95    Hwan-Seong Kim, Tuong-Long Nguyen, "Analysis of galloping amplitude for conductors with interphase spacers," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1520- 1525 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The main purpose of this paper is to calculate the behaviors of interphase spacers to reduce the amplitude of galloping in conductors. In simulation, three phases and iced-single/two-bundles conductors with/without spacers are considered in viewpoint of standard cases. The implicit/explicit finite element methods are used to calculate the transient response with geometric nonlinear behavior. ANSYS/LS-DYNA program is also applied. Calculation results can be used to predict the positions to insert the interphase spacers between conductors.

96    S. Balamurugan, R. Arumugam, S. Paramasivam, M. Malaiappan, "Transient analysis of induction motor using finite element analysis," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1526- 1529 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the analysis of the induction motor behavior during transient periods using the coupled electric circuit with two-dimensional finite element electro-magnetic field analysis. The designed geometric dimension of induction motor is modeled in the finite element domain. In the circuit domain, stator conductors are connected in distributed winding pattern and phase windings are connected in delta. Resistance and inductance values are added in series with each phase winding in the circuit domain to account the 3D parameter values in the 2D modeling [S. Williamson et al., 1990 and Pham, TH et al., 1999]. Each rotor conductor is connected in parallel and a resistance is added in the rotor circuit to account the end-ring resistance. The circuit domain degrees of freedom (DOF) (i.e) the winding current, induced e.m.f. in the windings and supply voltage, are coupled with finite element domain DOF (i.e) magnetic vector potential (MVP). The rotor motion is included in this model to get the real time simulation results. The transient performances are found at the starting of the motor with no load, the operation of the motor with asymmetrical excitation of the stator and turn to turn fault condition. Simulated results for a 3 hp, 4 pole, 50 Hz and 3-phase squirrel cage induction motor is presented.

97    T. Kojima, Y. Kikuchi, S. Seki, H. Wakiwaka, "Study on high precision angle measuring technology," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1530- 1535 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In recent years, high-precision and high-resolution encoders are expected for a nanotechnology control system. High-precision angle calibration apparatuses are required and hence, they have been developed according to industry expectations. The angle calibration system referred to in this case performs a measurement evaluation of the angle with super-high-precision. The accuracy of the disk and angle sensor was calibrated with high precision using the same accuracy measurement system, and a high-precision angle sensor was achieved. The resolution of the angle calibration system is 0.001 seconds, and its accuracy is 0.01 seconds. Measurement evaluation and compensation of an angle sensor and the disk accuracy was achieved, using the high-precision angle calibration system, and the encoder was realized with a high level of accuracy of 0.2 seconds. The principle by which the angle sensor calibrates the accuracy by itself has been developed. Employing the angle sensor in an environment where there was no previous possibility of using an angle calibration apparatus was found to be highly useful. In addition, a high-resolution angle sensor with 30-bit could be achieved, and the base technology of applying an angle sensor to a nanotechnology system was established.

98    Cai Zhiyuan, Yu Li, Ma Shaohua, "An intelligent circuit breaker with synchronous closing function based on DSP," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1536- 1539 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An intelligent circuit breaker with synchronous closing function based on DSP is presented in this paper. By which, the filtering algorithm based on Fourier algorithm is adopted in order to estimate the optimal reclosing angle so as to weaken the instantaneous current during reclosing circuit Based on the discussion of the digital signal processing technology, the hardware circuit has been set up and the software has been programmed. And the simulation results show a good agreement with the predictions.

99    Cai Zhiyuan, Yu Li, Ma Shaohua, "Reduction of disturbance effects and sustained oscillation using multi-sensor fusion in a flexible link system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1540- 1545 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this work, a general set of routines for multi-sensor fusion applied to a flexible link control system to reduce the effects of disturbance and the sustained oscillation in steady state is proposed. Since disturbance signals are tend to be introduced to control systems, it is necessary to rely on multi-sensor fusion to improve control performance in spite of disturbance. Multi-sensor fusion for a control system is considered as a sequence of making decisions for a combination of sensor data to make a proper control input in uncertain conditions of disturbance effects on sensors and the system. The proposed method is applied to a typical flexible link control system in which reduction of oscillation is obtained using a pair of photo sensors at the tip of the link. Since environmental light conditions affect the control performance critically, an accelerometer is used in addition to the existing photo sensors to overcome the difficulties. Also, the magnitude of sustained oscillation in steady state can be reduced by multi-sensor data fusion of various degrees of sensor resolution.

100    Gi-Beum Kim, Woo-Suk Chong, Seong-Hyun Kim, Kyong Kim, Seong-Hwan Jeong, Tae-Kyu Kwon, Nam-Gyun Kim, Chul-Un Hong, "Development of biosensor using surface acoustic wave," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1546- 1549 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this research, in using a piezoelectric material of Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT), which has a high electromechanical coupling coefficient, we have tried to see if the material can be practically available as a new surface acoustic wave (SAW) biosensor to detect protein. As the results, the frequency filtering of the central frequency of the PMN-PT substrate is a superior result to that of the LiTaO/sub 3/ (LT) substrate, but the result was not completely satisfactory. We know there is a problem in the design of inter-digital transducer (IDT) pattern. The waves transferred through the input terminal forms SAW which is sure to be transferred to the direction of the output terminal and the backward direction of the input terminal. This reflected wave is reiterated with SAW, which is transferred to the output direction, and so the frequency filtering gives a not good result. The electromechanical coupling coefficient of the PMN-PT substrate is excellent, and as such we can use it as a SAW sensor, in the near future, provided that there is a new IDT design to increase the frequency filtering.

101    Y. Okamoto, M. Ogita, "New concept phase shifting masks based on projection lens design," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1550- 1554 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For the purpose of shortening turn around time (TAT) and costs of phase-shifting mask (PSM) fabrication, we proposed a new concept of PSM composed of an opaque pattern substrate and a phase shifter substrate. It was considered that this PSM has the disadvantage of high wave-front aberration. In order to solve this problem, we have designed a high NA (0.75), very low aberration (0.0017 /spl lambda/) reduction projection lens system. Based on this design, we found that wave-front aberration of phase shifter substrate (0.09 inches thickness) between the mask and projection lens was reduced from 0.3314 /spl lambda/ to 0.0089 /spl lambda/ by projection lens system optimization of mask and imaging positions. We measured the intensity profiles of this prototype PSM using AMIS (Zeiss optical simulation microscope) and checked the intensity profiles of this PSM were better than that of the conventional PSM.

102    Dongbai Zhu, "Error analysis and calibration on digital optical metering unit," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1555- 1558 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new electronic system of digital optical metering unit (OMU) is proposed to assist high-voltage measuring, which can simultaneously monitor both current and voltage of busbars. The emphasis is put upon the error analysis of data sampling and transmitting modules within the OMU. Besides, numerical calculation is performed to make a correction on the measuring error. It is shown from the analysis in the paper that not only the measuring error can be reduced within a wide range of frequency, but also data recovery and synchronization can be obtained ideally.

103    Ok Jin Joung, Byoung Chul Kim, Young Han Kim, "Groove detection in aluminum plate using an IR sensor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1559- 1562 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A low-cost infrared temperature sensor module is developed for the detection of a concealed groove in an aluminum plate. The module consisting of five infrared temperature sensors in a row is used to scan the surface of the sample plate to measure the temperature variation while moving horizontally. A two-dimensional conduction equation is formulated and numerically solved to compare computational outcome with experimental results. The measurement results demonstrate temperature decrease at the position of the groove, which is also shown from the numerical solution of temperature distribution. Though the temperature measurement with the proposed sensor module is not stable near to the top and bottom of the plate, a distinctive temperature variation at the concealed groove shows the application possibility of the module to the detection of defects in a metal plate.

104    Jeong-Hyo Bae, Yoon-Cheol Ha, Tae-Hyun Ha, Hyun-Goo Lee, Dae-Kyeong Kim, Jae-Duck Lee, "Data logger apparatus for stray current measurement of subway and power line," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1563- 1566 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In present, most of metallic structures (gas pipeline, oil pipeline, water pipeline, etc) are running parallel with subway and power line in Korea. Moreover subway system and power line make a stray current due to electrical corrosion on metallic structures. The owner of metallic structures has a burden of responsibility for the protection of corrosion and the prevention against big accident such as gas explosion or soil pollution and so on. So, they have to measure and analyze the data about P/S(Pipe to Soil) potential, amplitude of stray current, point of source of stray current and so. In this paper, results of development about data logger apparatus for measurement stray current of subway and power line are presented.

105    In-hun Jang, Se-Hoon Oh, Kwee-Bo Sim, F. Harashima, "Development of planetary reduction motor with mechanical power monitoring and network capability," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1567- 1570 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals with the creation of planetary gear trains including sensor for torque and rpm and the useful way to measure the torque and RPM of the geared motor. For this we have made the planetary geared reduction motor with Hall sensors and with the monitoring system. The monitoring system displays the sensing data (torque, rpm) and calculated data (power) and also has the network capability with Bluetooth protocol. We show that our solution is much more inexpensive and simple method to measure torque and rpm than before.

106    Wenming Zhang, Guang Meng, "Nonlinear dynamical system of micro-cantilever under combined parametric and forcing excitations in MEMS," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1571- 1576 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a simplified model for the dynamics of an electrostatically actuated micro-cantilever in micro-electro-mechanical systems (MEMS) is presented. The harmonic balance (HB) method is applied to simulate the resonant amplitude frequency responses of this system under combined parametric and forcing excitations. The nonlinearities of this system, which is manipulated under different parametrical resonant conditions, applied voltages and various clearances between the two plates, are studied. The possible effects of nonlinear spring stiffness and nonlinear response from the air damping on this system, which can be ignored, are discussed. The nonlinear dynamical behaviors are illustrated using phase portrait and Poincare mapping. In addition, the analytical solutions are agreed well to the numerical resolutions. This investigation is to provide a dependable evidence for design, testing and applications of a micro-cantilever based in MEMS.

107    Hai-Don Lee, Gyu-Ha Choe, "A study on the operation characteristics of PFC at instantaneous power interrupt," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1577- 1581 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, there have been increasing demands for high power factor and low harmonic distortion in the current drawn from utility. The harmonic limits imposed by international standards. It needs the PFC techniques in order to reduce line current harmonics and comply with the standards. The average current control method that is the most proper PFC control method in a switching power supply of middle and high power has been used mostly to PFC control method. However, the switching device of PFC circuit has frequently destructed at power return after instantaneous power interrupts. Therefore, this paper has verified the cause of this problem and proposed the solution through simulation and experiment.

108    Deok-Ho Kim, Jungyul Park, Byungkyu Kim, Keum-Shik Hong, "AFM-based identification of the dynamic properties of globular proteins," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1582- 1587 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The analysis using a mathematical model rather than relying on experiment is essential in understanding the motion and mechanics of biological molecules with less cost. This paper investigates a real-time identification method for estimating the mechanical properties of the proteins in motion using an AFM-based nanomanipulation system. First, an AFM-based bio-characterization system is introduced. Second, a dynamic model for the interaction between an AFM cantilever in fluid and globular proteins is presented. Finally, based on a second-order time-varying linear model representing the protein-AFM interaction, a real-time estimation method of the mechanical properties of globular proteins is proposed. Simulation results and discussions are included. This technique can be used to determine the model of protein motion for the purpose of computer simulation and for a real-time modification of protein deformation.

109    In-Yong Seo, Myeong-Soo Lee, Jin-Hyuk Hong, Yong-Kwan Lee, J.S. Suh, "Identification of nonlinear continuous-time Hammerstein model using the Fourier modulating function technique," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1588- 1593 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Adaptive weighted least square (AWLS) using Fourier modulating function (FMF) method was applied for the identification of nonlinear continuous-time Hammerstein model. A simulation example is studied. In the example optimal selection of I/O data interval and maximum frequency index of Fourier modulating function have been investigated based on a RMS normalized error criterion. The illustrative simulation studies for the AWLS using FMF show the efficiency of the approach for the parameter identification of a continuous-time Hammerstein system in the presence of significant output measurement disturbances.

110    T. Komiyama, K. Aoki, E. Shimada, T. Yokoyama, "Current control method using voltage deadbeat control for single phase utility interactive inverter with FPGA based hardware controller," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1594- 1599 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new control method for the utility interactive inverter based on the deadbeat control with FPGA based hardware controller to improve the control response for a utility current is proposed. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control law to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control, which results in the improvement of the cost performance of the inverter. The utility interactive inverter is linked to the commercial source via interactive inductor, so the inverter control the output voltage based on the deadbeat control to regulate the output current through the interactive inductor, as the result, very fast transient response of the utility current can be achieved. Current control method using voltage deadbeat control and PLL control with quasi dq transformation with multi sampling parallel processing method are implemented in FPGA based hardware controller for single phase utility interactive inverter. The design concept of FPGA based hardware controller is also described, and the advantages and the disadvantage of the proposed method are discussed throughout simulations and experiments.

111    Seong-Jeub Jeon, F.C. Lee, "Does zero instantaneous reactive power guarantee zero reactive power under asymmetric voltage condition?," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1600- 1605 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The instantaneous reactive power concept has attracted much attention since its proposal. It has been claimed that reactive powers can be compensated instantly without energy storage system under asymmetric voltage condition, which received doubts from some authors. However, theoretical criticism has not been given clearly. In this paper, theoretical criticism and example are given to show that zero instantaneous reactive power does not mean zero reactive power under asymmetric voltage condition.

112    Eui-Cheol Nho, In-Dong Kim, Tae-Won Chun, Heung-Geun Kim, "Cost-effective power quality disturbance generator for the performance test of custom power devices," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1606- 1610 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a new sag-swell generator for the test of custom power devices such as UPS, DVR, DSTATCOM, SSTS, etc. The proposed scheme has good features of simple structure, high reliability, wide range of voltage sag and swell variation, and easy control. Outage, harmonic distortion, notches, and voltage unbalance also can be generated. The operation principle of the proposed scheme is described and the characteristics are analyzed through simulation. The usefulness of the scheme is verified through experiments.

113    J. Perez, V. Cardenas, H. Miranda, R. Alvarez, "Compensation of voltage sags and swells using a single-phase AC-AC converter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1611- 1616 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a topology to compensate voltage sags and swells simultaneously in critical loads is proposed. It consists in a single-phase AC-AC converter in a matrix arrangement, which keeps a continuous regulation in the output voltage. The proposed scheme has the capability to compensate up to 25% voltage sags and 50% voltage swells. The AC-AC converter does not require energy storage devices and it is connected between the AC mains and the load by using a series transformer. One of the advantages of this topology is that taps for the coupling transformer are no necessary to change the polarity of the compensation voltage. A four step switching technique is used to drive the AC-AC converter switches, executing snubberless operation. The reference signal is generated using single-phase d-q theory, obtaining a fast response time and high regulation. Simulation and experimental results of a 5 kW capacity, 127 V, 60 Hz equipment are presented.

114    Zhixiang Luo, L.A.C. Lopes, H. Sun, "A multi-featured single-phase utility interface with reduced DC link capacitor for distributed power sources," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1617- 1622 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper discusses the operating principles and implementation of a multi-featured single-phase utility interface for distributed power sources. It controls the active power injected into the utility grid to keep the DC bus voltage regulated and compensates for the reactive power demanded and the current harmonics created by a local load. The DC bus voltage control loop includes a voltage ripple estimator so that the low order harmonics (2nd, 4th, 6th...) can be cancelled from the feedback signal. This way, one can use a small non-electrolytic capacitor in the dc bus without distorting the grid current despite of an increased dc bus voltage ripple. Besides, the loop bandwidth can be increased for a faster response. A three-level hysteresis current control scheme that presents reduced average switching frequency is used to impose a sinusoidal grid current in phase with the grid voltage. Experimental results in a scaled-down prototype demonstrate the feasibility of the proposed power electronic interface.

115    Y.T. Woo, Y.C. Kim, "A digital control of a single-phase UPS inverter for robust AC-voltage tracking," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1623- 1628 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a digital controller for a single phase UPS inverter under two main considerations: (i) the overall system shall keep very low AC-voltage tracking error as well as no phase delay over different load conditions, and (ii) the digital controller shall be employed at a fixed sampling time. It is shown that the first requirement can be achieved by the proposed controller using the error-state approach. Due to the fixed sampling rate, the digital-control design using the emulation method may place a constraint on the speed of time response. We propose that such a problem can be dealt with by the so-called characteristic ratio assignment (Y.C. Kim et al., 2003).

116    C. Tarasantisuk, S. Tunyasrirut, V. Tipsuwanporn, "A Matlab/Simulink tool for enhancing efficient education of power electronics corresponding to the ETH power converter laboratory," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1629- 1633 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The simulations of power converter circuits corresponding, to the ETH converter laboratory, the experimental modules mainly focused on switching devices, using Matlab/Simulink are proposed in this paper. The various types of converters, non-isolated and isolated dc to dc converter, ac to dc converter with power factor correction and buck converter, are considered to be examples to clearly show the operating conditions of them. The results illustrate that all dynamical characteristics and properties of the converters available from the simulation are correctly followed to theories. In addition, with this work, simulation time can be reduced, and convergence problem can also be enhanced. Therefore, the advanced control system design methodology can be simply developed from the toolboxes to achieve an efficiency of the system.

117    C. Zhang, K.J. Tseng, "Design and FEM analysis of a flywheel energy storage system assisted by integrated magnetic bearings," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1634- 1639 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a compact and novel flywheel energy storage system. The flywheel acts as the rotor of the drive system and is sandwiched between two disk type stators. Concepts of magnetic levitation and axial-flux PM synchronous machine are incorporated to assist the rotor-flywheel to spin and remain in magnetic suspension in the gravitational axis. Three-dimensional finite element method is applied for studying the flux linkage, induced voltage, levitation force and rotational torque of the system. The analysis results support the feasibility of the proposed system.

118    A. Polic, M. Curkovic, K. Jezernik, "Matrix based design of the current source inverter with FPGA based implementation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1640- 1645 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper presents design, simulation and implementation of FPGA based current controller for single phase bridge. Current controller is based on hysteresis control principle, which is fast, robust and simple for implementation. Considering such an inverter as discrete-event driven system, a more systematic approach is introduced, which enables the use of hysteresis control in more complex inverters. The paper emphasizes a new matrix based approach to the modeling of the discrete event systems. Modeling of the structure of discrete event-driven system is based on matrix representation of Petri Nets. The discrete dynamics of such a system is described by transferring the system between its specific discrete states. This is denoted using combination of algebraic and logic equations. To confirm the proposed approach, simulation and experimental results are presented. The proposed algorithm was implemented on FPGA, which is considered as an alternative to the DSP based implementation.

119    Nam-Sup Choi, Yulong Li, "Modeling and analysis of AC line conditioner based on three-phase PWM Cuk AC-AC converter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1646- 1651 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the characteristics of an AC line conditioner based on three-phase PWM Cuk AC-AC converter are analyzed. The PWM Cuk AC-AC converter is modeled by using complex D Q circuit transformation whereby the important characteristic equations such as voltage gain, input power factor, and the interested voltages and/or currents can be analytically obtained. Moreover, AC analysis is given by perturbing the complex DQ circuit and thus the linearized model is obtained for control purpose. Finally, the digital simulation with PSIM shows the validity of the modeling and analysis.

120    Hao Ma, Siliang Han, "Analysis and design of sliding mode control for AC signal power amplifier," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1652- 1657 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, sliding mode control strategy for a novel DC/AC buck inverter is proposed, which is composed of two independent symmetrical bi-directional buck converters and is used in sinusoidal power amplifier design. For the framework of the inverter, the sliding mode control is applied to track and amplify DC-biased sinusoidal signal. Based on application of inverse function theorem, a time-independent sliding mode surface and corresponding sliding control law are obtained in selected phase plane. The existence and stability of the sliding mode control are analyzed by applying equivalent control, and the surface is modified for ensuring sliding domain. System parameters and converter losses are discussed. The sliding mode control scheme has dynamics and robustness with respect to both external disturbances and variations on the load and input voltage. Experimental results are included to validate the analysis.

121    J.I. Leon, L.G. Franquelo, E. Galvan, M.M. Prats, J.M. Carrasco, "Generalized analytical approach of the calculation of the harmonic effects of single phase multilevel PWM inverters," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1658- 1663 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper introduces a generalized analytical approach for calculating the total harmonic distortion THD and its weighted value WTHD for multilevel PWM inverters. The calculation considers one single phase and it can apply to any number of levels of the inverter in general. Although the analysis is based on the assumption of a high number of pulses, the developed equations can also be applied for lower frequency ratios fs/f1. The analytical formulas require the characteristic parameters of the PWM only, which are the modulation factor m, the switching frequency fs, the fundamental frequency f1, the effective inductance L and the DC link voltage inverters with a number of levels N are considered. It must be noticed that some differences appear between the case of N odd and N even. Several parametric curves arc calculated to define the specifications of an inverter with N levels in order to fulfill the harmonic voltage recommendations trying to reduce the output signal filtering.

122    S. Hamasaki, N. Uchino, M. Tsuji, "Novel method for line current detection type active filter using the disturbance observer," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1664- 1669 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In case of the harmonic compensation based on the detection of the line current, a problem of the resonance between the active filter (AF) and an LC filter often arises if an LC filter is connected parallel to the AF. The disturbance observer based AF can suppress the antiresonance between the AF, an LC filter and the line, and have good compensation performance compared with the general proportional control based AF. In this paper, the robustness of the disturbance observer based AF is considered and the new control method using the phase lead compensation is proposed for improving the stability and the simulation results of the proposed method with good results are presented.

123    Perez-Pinal, C. Nunez, R. Alvarez, I. Cervantes, "Comparison of multi-motor synchronization techniques," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1670- 1675 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Multi-motor applications has become a very attractive field in industrial applications replacing the traditional mechanical coupling. Applications can be found in paper machines, offset printing, textiles, differential drives, to name some examples. Multi-motor techniques are used where matched speed during acceleration, deceleration and changes in load requires "truly" speed and angle synchronization between at least two axes. Several synchronization techniques has bee developed in order to fulfill those necessities, in this work the master-slave, cross coupling technique, bi-axial cross-coupled control method, electronic (virtual) line-shafting and the relative coupling strategy are compared for different industrial applications. Practical results in a two 1.5 kW induction machine test ring are presented, showing advantages and limitation of those techniques during different load conditions. The work reported in this paper makes use of a V/Hz motor control scheme, but conclusions drawn can be applied to any motor control technique. Parallel research is on going, results are reported on future publications.

124    A.G. Abo-Khalil, Hyeong-Gyun Kim, Dong-Choon Lee, Jul-Ki Seok, "Maximum output power control of wind generation system considering loss minimization of machines," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1676- 1681 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a maximum output control of wind power generation system considering loss minimization of machines. The wind turbine has its own optimum rotational speed which produce the maximum power conversion for the given dimension and wind speed. Even at this optimum speed, the generator cannot produce the maximum output power due to the useless machine loss. In general, the machine loss can be reduced by the decreasing the flux level, resulting in the significant reduction of the core loss. For the vector-controlled induction machine drives, the d-axis current controls the excitation level and the q-axis current controls the generator torque, by which the speed of the induction generator is controlled according to the variation of the wind speed in order to produce the maximum output power. The generator reference speed is adjusted according to the optimum tip-speed ratio. The generated power flows into the utility grid through the back-to-back PWM converter. The grid-side converter controls the dc link voltage and the line-side power factor by the q-axis and the d-axis current control, respectively. Experimental results are shown to verify the validity of the proposed scheme.

125    L.A. Pereira, C.C. Scharlau, L.F.A. Pereira, J.F. Haffner, "Model of a five-phase induction machine allowing for harmonics in the air-gap field part II : transformation of co-ordinates and d-q models," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1682- 1687 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The first part of the paper presented and discussed the calculation of the main parameters of a five-phase induction machine. In this second part, co-ordinate transformations are introduced and applied to the general equations, resulting in a simpler set which has proved more appropriate for machine simulation and control. The transformations contain complex values and the new set of equations is described in terms of generalized symmetrical components. It is shown that each symmetrical component relates to a set of air-gap field harmonics and produces a corresponding torque. Mathematical expressions relating the harmonic order and the symmetrical components are derived and discussed. It is also shown that for each harmonic wave considered in the model, there exists one independent equivalent circuit and one set of independent voltage equations. From the d-q model obtained, it is possible to evaluate the influence of each space harmonic on the machine behavior and establish the base for the vector control of high-phase machines. Finally, the transformed equations allow the introduction of an independent d-q reference system for each harmonic considered.

126    M. Liserre, C. Klumper, F. Blaabjerg, V.G. Monopoli, A. Dell'Aquila, "Evaluation of the ride-through capability of an active-front-end adjustable speed drive under real grid conditions," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1688- 1693 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Better quality of the input currents, unity power factor and regenerative capability are not the only benefits of equipping an adjustable speed drive (ASD) with an active front-end stage. Controlling the power inflow may enable also the reduction of the de-link energy storage, which will then lead to the replacement of the electrolytic capacitors with film capacitors, which have lower energy density meaning that the volume is similar, but increases the ASD lifetime. In these circumstances, operation under unbalanced and distorted supply voltage as well as high dynamic operation of the ASD makes the control task more challenging. The aim of this paper is to investigate the ride-through capability of an ASD with active front-end under real grid conditions and In view of the minimum de-link storage. Experiments validate the theoretical analysis.

127    C.P. Mudannayake, M.F. Rahman, "A study of the transient behavior of a 42 V prototype integrated starter alternator for sudden load changes," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1694- 1699 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the analysis of the transient behavior of a prototype 42 V integrated starter alternator (ISA) for sudden DC load changes. The developed prototype system includes a field oriented controlled (FOC) induction machine drive, which is operated in both motoring and generating modes (ie. starter and alternator modes). During starting, the induction machine cranks the engine, which is emulated using separately excited DC motor, with high starting torque. In the generation mode, the power is input to the ISA from emulated engine while the DC bus voltage is maintained at 42 V. The prototype ISA was subjected to various sudden load changes when it is running as a generator in order to observe the transients in the DC bus voltage, motor voltages, and currents and so on. In this paper, experimental results are presented with a view to understand the transient characteristics of the system for sudden load changes.

128    Lianbing Li, S. Kodama, Y. Hori, "Anti-skid control for EV using dynamic model error based on back-EMF observer," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1700- 1704 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel anti-skid controller for EV without speed sensor is proposed to prevent the slip between tire and road. Based on back-EMF observer and dynamic model error observer, an anti-skid controller with PI regulator is designed and analyzed. When skid occurs, the equivalent inertia of the EV system changes, and the acceleration of the wheels also changes. A back EMF observer is constructed to acquire the information of speed as well as the acceleration. Then a dynamic model error observer is setup using the signal of back EMF to regulate the torque (current) command, and keep the status of EV within a safe area. By selecting the gains of proportional item and integral item of the regulator, the torque (current) reduction can be adjusted freely in some range, and it is proved that the controller with integral item has better performance in skid restraining. The experimental results of the vehicle simulator utilizing motor-generator system verified the effectiveness of our proposed method.

129    S. Kodama, Lianbing Li, Y. Hori, "Design of a simulator of one-wheel EV system for testing of slip-prevention controller," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1705- 1709 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a simulator of one-wheel EV system is designed for testing of slip prevention controller by using M-G set. The drive motor of the M-G set is used to simulate the drive wheel of the EV, and the load motor is used to simulate the load force of the chassis. In driving process, the torque of the load motor is changed according to the drive force of the chassis that is calculated by the program. So it can simulate the dynamic process of the tire-road system. Based on this simulator system, a novel slip controller with inertia regulator is proposed and tested. The simulation results simulated by MATLAB and the experiment results have the same features and the results verified the simulating performance of the M-G system. And the experiment results proved the validity of the slip controller.

130    Jeong-Woo Jeon, Ki-Chang Lee, Don-Ha Hwang, Sae-Han Lee, Joo-Hoon Lee, Yong-Joo Kim, "The research of real-time test of brake-by-wire system for aircraft using HILS & dynamometer system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1710- 1715 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, it Is a study to valid a compatibility of digital control unit (DCU) for an aircraft brake system through a dynamometer test as well as HILS test It is very important because results of this test are satisfied before installing on an aircraft. The dynamometer system is composed of dynamo, HILS (hardware-in-the-loop-simulation) and velocity sensors installed on wheel and dynamo. The DCU was tested under various friction conditions in HILS and dynamometer test. The DCU with ABS control algorithm protected very well a wheel skid on high friction condition as well as low friction condition.

131    Jae Heon Ryu, Yu Shin Chang, Gun Hong Park, Chun Han Lee, Seok Hyun Park, Man Hyung Lee, "Research on navigation system of an autonomous vehicle using RTK-DGPS," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1716- 1720 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the development of navigation system for an autonomous ground vehicle at limited area by using RTK-DGPS. Before the autonomous drive, we make map data by using RTK-DGPS that is a reference trajectory for the autonomous vehicle. The navigation system with map data computes the yaw angle of the vehicle by using its present position and next position. And the steering wheel of the vehicle is controlled by using fuzzy logic controller. A prototype of the autonomous vehicle by the navigation method is developed and navigation performance of the system is evaluated. The experimental results show that the navigation system based RTK-DGPS can exactly track the map at the low speed. We expect that this navigation system can be more accurate by augmenting other sensors.

132    Kuo-Tsai Chang, "Ultrasonic clutch using piezoelectric vibrators," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1721- 1726 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper investigates the design, fabrication and test of an ultrasonic clutch with two piezoelectric vibrators, which is driven by the phenomenon of ultrasonic levitation. For the vibrators, one is used as a driving member connected to a shaft of a driving motor, and the other is used as a slave member connected to a shaft of a mechanical load. The operating principle of the clutch is expressed first. Then, the mechanism of the clutch is designed and constructed, and thus mounted between the driving motor and the mechanical load. Moreover, a full-bridge switching resonant inverter, including a DC chopper, a resonant tank and an equivalent circuit of the vibrator, is used to generate a sinusoidal voltage source at the input terminals of each vibrator. Furthermore, a set of speed measuring system is required to detect the rotational speeds of the slave shaft. As anticipated, the radiation surfaces of the vibrators can be coupled when both vibrators are not energized electrically. These radiation surfaces can also be separated when at least one of the vibrators is energized with high AC power.

133    Y. Yokoi, S. Ichikawa, S. Doki, S. Okuma, T. Naitou, T. Shiimado, N. Miki, "Driving pattern prediction for an energy management system of hybrid electric vehicles in a specific driving course," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1727- 1732 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Energy management systems that consider a whole driving pattern have been proposed to improve the fuel consumption and the emissions of hybrid electric vehicles. In this research, we propose a new energy management system that includes a driving pattern prediction system. The proposed method pay attention to a commuting to work because a commuting occupies the large portion of mileage and are repeated day-to-day. Therefore the database of driving patterns can be simply constructed by the proposed clustering method, and the future driving pattern can be predicted from the database. In this paper, it is shown that the actual driving pattern is changed by external factors, and we propose an improve method of driving pattern prediction. The experimental result shows the availability of the proposed system.

134    Chi-Huang Lu, Ching-Chih Tsai, "MIMO neural-network predictive controller design," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1733- 1738 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a neural-network predictive control for a class of multi-input multi-output (MIMO) nonlinear systems with time-delay. The MIMO neural-network predictive control law is developed based on the minimization of a generalized predictive performance criterion and the stability of the closed-loop control system is investigated as well. Simulation results reveals that the proposed control gives satisfactory tracking and disturbance rejection performance for the illustrative multivariable systems. Experimental results for heating process of a plastics injection molding machine are performed which have shown efficacy of the proposed method under the condition of set-points and significant plant uncertainties.

135    Lee Yang Woo, Kim Dong, Kwak Il Doo, "The design of motor speed controller using neural networks for disturbance reduction," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1739- 1742 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes feedforward neural networks space vector PWM implementation of a three-level voltage-fed inverter. The general expressions of time segments of inverter voltage vectors for all the regions have been derived and the corresponding time intervals are distributed so as to get symmetrical pulse widths and neural-point voltage balancing. Space vector PWM been implemented by neural networks. Neural networks, in general, are showing very high promise for simplification of control and feedback signal processing in high performance sensorless vector-controlled drives. The proposed neural networks controller has good performance to reject the effects of disturbance. The simulation has been conducted for the verification of a proposed system, and the results show good speed responses.

136    Li Xie, "Stochastic robust stability analysis for discrete-time neural networks with Markovian jumping parameters and time delays," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1743- 1748 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The problem of stochastic robust stability analysis for uncertain discrete-time delayed neural networks with Markovian jumping parameters is investigated. Based on linear matrix inequality (LMI) methodology, a novel approach is developed. The sufficient conditions of stochastic robust stable are given in terms of linear matrix inequalities. The stable criteria represented in LMI setting are less conservative and more computationally efficient than existing results reported in other literature.

137    T. Nakano, M. Nagamatu, "Solving warehouse location problem by Lagrange programming neural network," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1749- 1753 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The LPPH-CSP is a neural network for solving the constraint satisfaction problem (CSP), which is a combinatorial problem to find a solution which satisfies all given constraints. The trajectory of the LPPH-CSP is not trapped by any point which is not the solution of the CSP. Though the already proposed other methods for solving the CSP must update all variables sequentially, the LPPH-CSP can update all variables simultaneously. We think this is an advantage of the LPPH-CSP for VLSI implementation. In this paper, we add new types of constrains to the CSP, and extend the LPPH-CSP for these types of constraints. We apply this new LPPH-CSP for solving the warehouse location problem (WLP), which is a kind of the CSP with an objective function.

138    Y. Ohnishi, M. Hirata, "A nonlinear neural-net based PID controller using local linear models," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1754- 1757 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: PID control schemes based on the classical control theory have been widely used for various process control systems for a long time. However, it is difficult to find a set of suitable PID parameters for nonlinear systems. In this paper, a compensation method of PID parameters for the nonlinear systems is proposed by using a neural network.

139    K. Kiguchi, H. Henrichfreise, K.-P. Hesseler, "Friction compensation of the electromechanical drive systems using neural networks," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1758- 1762 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Friction is an undesired phenomenon in many mechanical systems. Feedforward of a suitable estimate of friction is an effective method to compensate for the friction-dependent position errors in the steady state. It is not easy, however, to make a precise friction model because of the complexity of static and dynamic characteristics of friction such as the Stribeck effect, the Dahl effect, stick-slip motion, and so on. In this paper, we propose an effective friction compensation method for the electromechanical drive systems. In the proposed method, neural networks are applied in parallel to a linear observer, for the electromechanical positioning system (EMPS) which is used at the Cologne Laboratory of Mechatronics (CLM) at the University of Applied Sciences Cologne for experimental investigation of position control schemes for compliant systems with friction.

140    Rong-Jong Wai, Chun-Yen Tu, Po-Chen Chen, "Robust neural-fuzzy-network control for rigid-link electrically driven robot manipulator," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1763- 1768 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This study addresses the design and analysis of an intelligent control system for an n-link robot manipulator to achieve the high-precision position tracking. According to the concepts of mechanical geometry and motion dynamics, the dynamic model of an n-link robot manipulator including actuator dynamics is introduced initially. However, it is difficult to design a suitable model-based control scheme due to the uncertainties in practical applications, such as friction forces, external disturbances and parameter variations. In order to deal with the mentioned difficulties, a robust neural-fuzzy-network control (RNFNC) system is investigated to the joint position control of an n-link robot manipulator for periodic motion. In this control scheme, a four-layer neural-fuzzy-network (NFN) is utilized for the major control role, and the adaptive tuning laws of network parameters are derived in the sense of projection algorithm and Lyapunov stability theorem to ensure the network convergence as well as stable control performance. The merits of this model-free control scheme are that not only the stable position tracking performance can be guaranteed, but also no prior system information and auxiliary control design are required in the control process. In addition, numerical simulations of a two-link robot manipulator actuated by DC servomotors are provided to verify the effectiveness and robustness of the proposed RNFNC methodology.

141    Q.Y. Hong, S. Kwong, "Maximum model distance discriminative training for text-independent speaker verification," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1769- 1774 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the design and implementation of text-independent speaker verification. We apply the maximum model distance (MMD) algorithm to the Gaussian mixture model (GMM) training. The traditional maximum likelihood (ML) method only utilizes the labeled utterances for each speaker model, which probably leads to a local optimization solution. By maximizing the model distance between the target and competing speakers, MMD could add the discriminative capability into the training procedure and then improve the verification performance. Based on the TIMIT corpus, we designed the verification experiments and the results show that the equal error rate (EER) could be reduced greatly compared with the traditional ML method.

142    Jiang Changhong, Wang Longshan, Yon Wen, Liu Zhixin, "Research on acoustic emission signals de-noising based on translation invariant wavelet," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1775- 1778 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The wavelet threshold method may produce pseudo-Gibbs phenomenon on the singularity points of signal. The translation invariant wavelet is an improve method based on that algorithm. Comparing with threshold method, a translation invariance method can suppress pseudo-Gibbs phenomenon and minish RMSE between the original signal and estimated one. At the same time, SNR of estimated signal can also be improved. This method is used to de-noise acoustic emission signals and compared with threshold method. The simulation result shows that this method can effectively eliminate noise, extract characteristic information of acoustic emission signals. It has strong engineering practicality.

143    K. Izumi, K. Watanabe, Y. Tamano, "Japanese voice interface system with color image for controlling robot manipulators," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1779- 1783 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, voice commands based on natural spoken language are used so that two or more same colored objects are tracked by a robot manipulator. More precisely, after receiving a voice command regarding the color information, the end-effector of the robot is controlled to approach a desired object out of many objects by visual feedback, in which the visual information is further applied to the human if a more correct motion of the robot is required. Thus, the present objective is to obtain a smoother cooperative system between human and robot, by coordinating voice and visual information.

144    T. Takechi, K. Sugimoto, T. Mandono, H. Sawada, "Automobile identification based on the measurement of car sounds," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1784- 1789 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A system to detect a car by measuring an automobile sound is introduced. The time difference between the signals taken from plural microphones is measured by using a specially-designed microphone array. The sound source location is estimated based on the calculation of the cross-correlation, and a particular car is identified. The measurement was tested in different noisy environments for the practical use, and fair results were obtained.

145    J.K. Wu, "Digital algorithms for parameter estimation of multiple signals using numerical differentiation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1790- 1794 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel algorithm for amplitude and phase estimation of the multi-component signals is presented in this paper. The proposed algorithm is based on numerical differentiation and central Lagrange interpolation, and needs 1 signal sample with 7 points and 1 computation process. With any frequency value of component 1, 2 and 3 of the signal over 1 Hz to 100 kHz, the amplitude and phase angle of the signal are all estimated at an accuracy of higher than 0.1% with the amplitudes of the component 1,2 and 3 varying from 1 V to 200 V and the phase angle of the component 1, 2 and 3 varying from 0 to 360. Spending at most half cycle for parameter estimation of the multi-component, so that the proposed algorithm is adaptive to any intelligent measurement and control. A testing example is given to illustrate the proposed algorithm, with the simulation is carried out in Matlab software.

146    Y. Kawamura, M. Tsurushima, N. Aoshima, K. Mizutani, "Fundamental study on ultrasonic measurement system to detect penetration of boulders using auto-correlation analysis," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1795- 1798 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Generally, in the estimation of damage and the investigation of the size of every concrete artificial structure thing, nondestructive test is used. An ultrasonic method and an elastic impact wave method are mentioned to the typical thing of a nondestructive test method. The authors have developed a new ultrasonic method by using ultrasonic wave of the chirp signal and auto-correlation analysis. In this paper, the experiment is separated Pattern 1 and Pattern 2. In Pattern 1, ultrasonic transfer characteristics were investigated for concrete blocks. It was confirmed that the frequency components of 40 /spl sim/ 60 kHz had a good permeability with each thickness of concrete blocks. In Pattern 2, experiment of receiving the reflection wave was carried out using concrete block with width of 900 mm and ultrasonic wave of the chirp signal. Reflection wave was detected in the down chirp signal from 50 kHz to 40 kHz. And the length of concrete block was calculated using auto-correlation was set to 898.156 mm. Like this, the good result that has little error could get it using this system.

147    K. Matsui, I. Yamamoto, H. Mori, "Power supplying for five-level inverter using multi-output chopper," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1799- 1804 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In the fields such as various electric power compensators and ac motor drives, large capacity and high-performance converters are placed into practical applications. For these converters, since the upper limit of the switching frequency is low and capacity of device is insufficient, method of connecting the device in series and parallel would be effective. From such reasons, for improving the harmonic characteristics, various multi-level inverters have been reported, in which it is necessary to provide some dc power supplies connected in series that is disadvantage for this inverter. We propose a simple dc-dc converter for adjusting the power supply voltages of this inverter. By means of this dc-dc converter circuit, the voltages of four dc power supplies of five-level inverter can be suitably controlled towards the desired value. The circuit characteristics are discussed by theoretical and simulated procedures. The theoretical results and the simulated ones are in agreement with each other.

148    Feel-soon Kang, Kyu Young Rhee, Sung-Jun Park, Chae-Joo Moon, T. Ise, "New approach for cascaded-transformers-based multilevel inverter with an efficient switching function," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1805- 1810 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new multilevel PWM inverter is presented to improve the system characteristic of a prior 11-level shaped PWM inverter scheme. In appearance, it consists of three full-bridge modules and three cascaded transformers; therefore, the configuration of the proposed multilevel PWM inverter is equal to that of the prior one. Only the turn-ratio of a transformer and its corresponding switching function are different from each other. Based on these differences, the proposed multilevel PWM inverter has two promising advantages. First, output voltage levels increase almost two fold. Consequently, it can generate more sinusoidal output voltage waves. Second, due to a suitable switching pattern, it lightens power imposed on the transformer, which is used for compensating output voltages with chopped pulses between steps. Operational principle of the proposed 19-level shaped PWM inverter is analysed with comparisons of the prior 11-level shaped PWM inverter. The validity of the proposed inverter system is verified by computer-aided simulations and experimental results based on a 1kW prototype.

149    Nguyen Van Nho, Gun-Woo Moon, Myung-Joong Youn, "Analysis of carrier based PWM methods in relation to common mode voltage for multilevel inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1811- 1816 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new approach to implement a carrier based PWM modulator in a multi-level inverter, using correlation between carrier based PWM and space vector PWM. Using the performed relation, different CPWM methods in a multilevel inverter can be simply clarified and appropriately modified for obtaining required performance. In this paper, the principle of carrier based PWM with medium and minimum common mode voltage and possible variants of implementation is introduced. It also shows several advantages from the minimum common mode voltage methods. The proposed CPWM modulator algorithms are advantageous for the simplicity and flexibility to apply to a high level inverter.

150    Sanmin Wei, Bin Wu, S. Rizzo, N. Zargari, "Comparison of control schemes for multilevel inverter with faulty cells," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1817- 1822 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Cascaded H-bridge multilevel inverter has been receiving wide attention mainly due to its capability of high voltage operation without switching devices connected in series. In real applications, one or more cell may fail and the output voltage is unbalanced, causing damaging results to load. In this paper, three control schemes including NS 1 and NS 2 based on neutral shift (NS) with delta injection and space vector (SV) PWM way, are compared in terms of the output line-to-line voltages THDs and their difference ratio. The reason of the difference is given for the first time, which has not been fully understood before. Based on this, a modified SV method is proposed. The theoretical results are also given, which shows that the NS has better performance than SV in theory. However, NS 1 and NS 2 are only approximately way to implement NS and they cannot achieve the best performance of NS, while modified SV has much better performance in terms of voltage difference ratio, which plays the most important role in a system with faulty cells. Simulation and experimental results are given to verify the algorithm.

151    A.K. Gupta, A.M. Khambadkone, K.M. Tan, "A two-level inverter based SVPWM algorithm for a multilevel inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1823- 1828 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Implementation of space vector modulation for multilevel inverters is complex and computationally intensive due to difficulty in determining the location of reference vector, calculation of on-times and determination of switching state vectors. This paper proposes a simple space vector PWM algorithm for a multilevel inverter based on standard two-level inverter and its implementation. Since the pro-posed multilevel space vector modulation method uses the basic two-level modulation to calculate the on-times, computation process for n-level inverter becomes simpler and easier. The main advantage of the proposed methodology is that it uses a simple mapping process to achieve the multilevel space vector modulation. The effectiveness of the algorithm has been verified by simulation and experiments, on a 3-level inverter.

152    Heqing Zhong, Yunping Zou, Zhixin Xu, Zeyun Chao, Jin Li, Yuan Pan, "Analysis of three-level series resonant soft switching CCPS," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1829- 1832 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a series resonant soft switching capacitor charging power supply (CCPS) based on three-level inverter topology. It has two work modes including full voltage mode (FVM) and half voltage mode (HVM). It can be used to change the charging speed of CCPS. It also can be used in the particular scenes that need higher charging voltage precision.

153    Gui-xin Wang, Bin Wang, Yong Kang, Jian Chen, "A novel voltage-controlled delta-modulated UPS inverter control scheme," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1833- 1838 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel voltage-controlled delta-modulated inverter control scheme for UPS applications. Comprehensive analysis for system performances on the basis of theory, computer simulation, and experiment are presented. The proposed voltage-controlled delta-modulated inverter control scheme is able to make a voltage source inverter (VSI) act as an ac voltage source and thereby, the amplitude perturbation caused by load and DC rail voltage variations, the waveform distortion caused by load non-linearity, of the UPS output voltage are all suppressed. The principles of the proposed system configuration and operation are introduced. The effects of the system parameters variation on the system performances are analyzed with discrete Fourier transform (DFT) and MATLAB simulation, and the resultant normalized curves can be used as engineering design guideline. Experiment results validate both the theoretical analysis and the simulation results.

154    K. Higuchi, K. Nakano, T. Kajikawa, E. Takegami, S. Tomioka, K. Watanabe, "Robust control of DC-DC converter by high-order approximate 2-degree-of-freedom digital controller," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1839- 1844 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In many applications of DC-DC converters, loads cannot be specified in advance, i.e., their amplitudes are suddenly changed from the zero to the maximum rating. Generally, design conditions are changed for each load and then each controller is re-designed. Then, a so-called robust DC-DC converter which can cover such extensive load changes and also input voltage changes with one controller is needed. Analog control IC is used usually for the controller of DC-DC converter. Simple integral control etc. is performed with the analog control IC. However it is difficult to retain sufficient robustness of DC-DC converter by these techniques. The authors proposed the method of designing an approximate 2-degree-of-freedom (2DOF) controller of DC-AC converter. This controller has an ability to attain sufficient robustness against extensive load and DC power supply changes. For applying this approximate 2DOF controller to DC-DC converter, it is necessary to improve the degree of approximation for better robustness. In this paper, we propose a method of designing high-order approximate 2DOF digital controller which makes the control bandwidth wider, and at the same time makes a variation of the output voltage very small at a sudden change of resistive load. The proposed high-order approximate 2DOF digital controller is actually implemented on a DSP and is connected to a DC-DC converter. Experimental studies demonstrate that this type digital controller can satisfy given specifications.

155    Heng Deng, R. Oruganti, D. Srinivasan, "High-performance control of a UPS inverter through iterative learning based on zero-phase filtering," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1845- 1850 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The purpose of a voltage controller for UPS inverters is to produce stable and regulated output voltage with low distortion under all loading conditions, especially under nonlinear loads. Since the loads which cause the tracking errors in the output voltage are typically periodic, iterative learning control is an obvious and excellent intuitive choice for achieving this close voltage tracking. In this paper, an iterative learning controller based on zero-phase filtering is directly combined with the open-loop UPS inverter. Due to the feedforward involved in the open-loop inverter operation, the overall dynamic response can be expected to be reasonably satisfactory. A zero-phase filter designed in frequency domain is applied to compensate the open-loop inverter so as to ensure error convergence. This acts to compensate the poor dynamics of the inverter owing to the presence of the L-C circuit. Furthermore, a forgetting factor is introduced in this control algorithm to increase the robustness of the scheme against measurement noise, initialization error and/or variation of system dynamics due to parameter drift. The experimental results show that the proposed controller can achieve very low total harmonic distortion and fast error convergence under different loads even with only one sensor. The proposed method can be an effective solution for UPS products where high-quality output voltage is more important than fast dynamic response.

156    Kuo-Kai Shyu, Ming-Ji Yang, Jing-Heng Hong, Bau-Hung Lin, "Automatic voltage regulator using a novel phase-shifted PWM single-phase inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1851- 1855 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel phase-shifted pulse width modulation (PS-PWM) automatic voltage regulator (AVR) with fast voltage control and reduced total harmonics is proposed. The novel PS-PWM AVR is made up of an AC/AC converter with reversible voltage control and a transformer for series voltage compensation. In the active rectifier, a proper switching operation is achieved without the problem of power factor correction. The AVR uses a fully digital controller, which is implemented by a fixed-point digital signal processor (DSP) TMS320F240 DSP-based board. Therefore, the proposed AVR gives high efficiency and reliability. It is also shown via some experimental results that the presented novel PS-PWM AVR gives good performance for high quality of the output voltage.

157    J.W. Baek, M.H. Ryu, D.W. Yoo, G.H. Rim, "Wireless parallel operation of high voltage DC power supply using steady-state estimation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1856- 1860 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an improved droop method, which minimizes the voltage droop of a parallel-connected power supply. Conventionally, the droop method has been used to achieve a simple structure and no-interconnections among power sources. However, it has a trade-off between output voltage regulation and load sharing accuracy. In this paper, the droop is minimized with a current and droop gain control using steady-state estimation. The proposed method can achieve both good voltage regulation and good load sharing. A design example of two 10 kV, 100 mA parallel modules are made and tested to verify the proposed current sharing method.

158    Jun-Keun Ji, Jang-Hwan Kim, Seung-Ki Sui, Hyo-sung Kim, "A novel three-phase line-interactive UPS system with parallel-series active power-line conditioning capabilities using AC line reactor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1861- 1866 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper a novel three-phase line-interactive UPS system with parallel-series active power-line conditioning capability using AC line reactor and two four-leg voltage source converter (VSC) is proposed. The four-leg VSC can use the DC-link voltage effectively by the 3-D SVPWM method. Hence the DC battery voltage can be reduced by 15% in comparison to that of the conventional line-interactive UPS system. The parallel inverter operating as a shunt active filter is a controlled voltage source and controls the three-phase line voltage independently in order to control the source current. It eliminates the neutral line current and the active ripple power of the source side using the dqo transformation so that unity power factor and the sinusoidal source current can be achieved even though both the source and the load voltages have zero sequence components. The series inverter operating as dynamic voltage restorer (DVR) compensates the load voltage and allows it to be balanced and harmonic-free. Both of the series and shunt inverters always act as independently controllable voltage sources, so that the three-phase output voltage can show a seamless transition to the backup mode. The feasibility of the proposed UPS system has been investigated and verified through experimental results.

159    Tian-Hua Liu, Ching-Guo Chen, "Implementation of sensorless techniques for switched reluctance drive systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1867- 1872 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes two different methods to estimate the shaft position for a switched reluctance motor (SRM). Method 1 uses the self-inductance estimation technique to obtain the rotor position. Method 2 uses the phase-locked loop technique to generate the signals of the estimating rotor position. The two proposed methods are compared and discussed in details. Several experimental results are shown to validate theoretical analysis. The adjustable speed range of the system is from 10 r/min to 3000 r/min. In addition, the drive system is automatically started from standstill to a required speed.

160    Shun-Chung Wang, Wen-Han Lan, "Turn-on angle searching strategy for optimized efficiency drive of switched reluctance motors," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1873- 1878 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes an adaptive turn-on angle searching strategy for the switched reluctance motor (SRM) to optimize the system drive efficiency and speed up the transient response at the specified operating conditions. The control strategy implemented in this paper first is to fulfill the desired speed at the required load torque. When the SRM operates in the steady state, an on-line adaptive searching approach then is performed by continuously tuning the turn-on angle to minimize the total power consumption of the drive system. The variation of the motor's phase current is used to control the tuning of the turn-on angle. The searching time of optimal efficiency is strongly dependent on the energizing commutation angles. A set of starting control parameters (/spl theta//sub on-s/ , /spl theta//sub off-s/ and I/sub ref/) is obtained from the online calculation and interpolation of the lookup tables, which are built based on the accurate characterized model of the SRM, to speed up the dynamic response, satisfy the torque-speed demand, and shorten the searching time. Simulation and implementation in a TI 2407 DSP controller has been developed to verify the proposed method. Experimental tests on a 4-phase 8/6 pole SRM at different operation conditions are given. A comparison with the conventional mode-shift control method shows that well improvement in system drive efficiency has been achieved by the described control strategy.

161    R. Cardenas, R. Pena, M. Perez, G. Asher, J. Clare, P. Wheeler, "Control system for grid generation of a switched reluctance generator driven by a variable speed wind turbine," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1879- 1884 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel control system for the operation of a grid connected switched reluctance generator driven by a variable speed wind turbine. The SRG is connected to a power converter which is controlled to drive the wind energy conversion system (WECS) to the point of maximum aerodynamics efficiency using closed loop control of the power output. A second power converter, a vector controlled voltage source PWM inverter, is used to interface the machine to the grid. An experimental prototype was constructed in which the wind turbine was emulated by an induction machine drive. Experimental result obtained with this prototype are presented and discussed in this paper.

162    L. Ben Amor, L.-A. Dessaint, O. Akhrif, "Switched reluctance motor torque control with peak current minimization," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1885- 1890 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper a new instantaneous torque controller is designed for a low speed operation of a switched reluctance motor (SRM). The commutation angles are optimized in order to minimize the torque ripple which occurs at commutation regions. The ripple-free torque which can be developed by the motor is evaluated for both single and double phase excitation methods. In order to minimize the peak current observed at the end of each active region, a current limiting control law based on torque-current characteristics is proposed. Simulation results show that the proposed torque control strategy allows good torque tracking with low torque ripples and minimum peak currents. Moreover, it is simple to implement since it does not require time consuming online computations.

163    Zhiwu Li, Xingping Wang, "Design of a more permissive and structurally simple liveness-enforcing Petri net supervisor for flexible manufacturing systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1891- 1895 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops a deadlock prevention policy for a class of Petri nets which can model flexible manufacturing systems, where deadlocks are caused by unmarked siphons. We distinguish emptiable siphons in a plant Petri net model by elementary and redundant ones. By adding a monitor for each elementary siphon, all redundant siphons can be controlled. Furthermore, by checking the redundancy of the additional monitors, we can remove some monitors added, which leads to a more permissive and structurally simple liveness-enforcing Petri net supervisor.

164    A.R. Wang, Z.W. Li, J.Y. Jia, "A Petri nets based deadlock avoidance policy for flexible manufacturing systems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1896- 1901 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Developed in this paper is a new deadlock avoidance strategy for flexible manufacturing systems, which is based on Petri nets and their structural analysis. The deadlock avoidance policy only uses partial reachability graph of the Petri net without the computations for the whole reachability graph, this deadlock avoidance approach is first to compute some special states or markings, such as deadlock markings, bad markings, and dangerous markings we call. In a bad state (marking), the system (Petri net) will inevitably reach a deadlock, whereas in a dangerous state, the system may not reach a deadlock if the firings of enabled transitions are properly controlled by supervisory control The deadlock avoidance policy presented here is in fact to make the system never reach a bad state. The major advantage of the technique lies in the fact that It is suitable for much larger Petri nets than that of the most existing deadlock avoidance policies and the supervisory control is maximally permissive. Meanwhile, the computation is successfully avoided for the whole reachability graph of the Petri net of the system.

165    Pei-Ying Huang, Tzung-Pei Hong, Gwoboa Horng, Cheng-Yan Kao, "Extending the Palmer algorithm to solve group flexible flow-shop problems," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1902- 1907 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In simple flow shop problems, each machine operation center includes just one machine. If at least one machine center includes more than one machine, the scheduling problem becomes a flexible flow-shop problem. Recently, group scheduling has also been proposed and discussed. In the group scheduling, each job belongs to a specific group and all the jobs are processed group by group. In this paper, we propose a heuristic algorithm to solve group flexible flow-shop problems with more than two machine centers, which have the same number of machines. It first determines the job sequencing in each group by combining both the LPT and the Palmer approaches to solve the flexible flow-shop problems of more than two machine centers. It then determines group sequence by the Palmer approach. Experiments are also made to compare the performance of the proposed algorithm with the optimal solutions based on the dynamic-programming technique.

166    R.C. Luo, Cheng Lung Chang, Zhong Hong Huang, Jyh Hwa Tzou, "Rapid tooling for automated desktop manufacturing," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1908- 1913 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new rapid tooling (RT) system based on pre-placed metallic powder has been proposed. A 500 W Nd-YAG laser, a pre-placed powder mechanism, a linear planar motor based working table, and PC-based controller are incorporated for the hardware architecture. In this research, we propose a software technique that includes slicing with bucket sorting, direct slicing, and tool path generation algorithms. The slicing method provides the direct slicing of the CAD model in IGES geometric format to improve the accuracy of desired part. Effort was attempted to find out the better parameters of laser cladding using single clad and cladding layer techniques. The process of the proposed system involves path control, laser cladding of layer by layer, milling, and finishing. Based on the investigation, some metallic components were fabricated.

167    S.J. Lim, J. Lyou, "Design of multi-agent based sensory agent for intelligent machine," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1914- 1917 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An intelligent machine is defined as a machine equipped with functions such as autonomous cognition, data collection, knowledge creation, and knowledge exchange with other machines. These functions are expressed as sensory function, conversionary function, and decision support function. In particular, the sensory function is composed of the first step of intelligent machine, which is connection to hardware, and the second step, which is information processing. We designed a multi-agent based sensory function to develop intelligent machine.

168    Feng Xia, Zhi Wang, Youxian Sun, "A framework-based approach to control system engineering following IEC61499," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1918- 1923 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Global competition and rapidly changing market requirements pose significant challenges for traditional control system engineering. To achieve systematic reuse in control system engineering, a framework-based approach is presented. Framework technology promotes reusing both architecture and components, thereby benefiting the whole lifecycle of control systems. An architecture that mainly consists of HMI, engineering tool, function block repository, and intelligent devices is proposed, which enables architecture level reuse. The component model with IEC61499 is introduced as the building block. The framework-based engineering methodology integrates new technologies in software engineering with IEC61499, and provides design pattern level reuse. An illustrative example of control system development for a water tank is presented, using the framework-based approach.

169    Young Ho Seo, Jung Hwan Ahn, "Microscopic surface estimation through light distribution analysis of reflected laser beam," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1924- 1928 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: There are shortcomings for light interferometry-based non-contact microscopic surface measurements when used in-process, thus this study proposes an enhanced measurement method based on light reflectivity. Although reflected light contains information about surface shape, the entire surface profile cannot be measured directly such as in the interferometry-based method. Therefore, a different approach is used to overcome these limitations: a detailed surface model is developed from surface height and spatial frequency. Light reflectance theory is adopted to simulate light scattering in many virtual specimens, which are generated by a light reflectance model. As a result, a notable correlation between surface components and reflected light has been established. Even though either simulations or experiments can reveal the correlation as a numerical formula, one of the surface components is used separately, thus a signal-processing algorithm to decompose surface components is proposed in this study. In order to prove the reliability of the newly proposed measurement scheme, experiments are conducted using a fabricated optical probe.

170    E. Nishiyama, C. Nishijima, K. Kuwanami, "A method for fault detecting on twisted pair cable network by use of m-sequence correlation," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1929- 1934 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Monitoring a communication line is significant for broadband, mobile phone and so on. In this paper, we propose a new method for detecting a fault point of communication line by use of m-sequence correlation technique. In this method, signal detection is used. At receiving tap, we make same sequence with the input one and take crosscorrelation function between m-sequence and the received signal. We can get transfer functions of path between a input and output tap separated from different delay times on the crosscorrelation function, and from these transfer functions, so fault point is occurred when we compare them.

171    M.A. Alhamadi, M. Benammar, L. Ben-brahim, "Precise method for linearizing sine and cosine signals in resolvers and quadrature encoders applications," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1935- 1940 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Resolvers and quadrature encoders provide electrical signal related to the sine and cosine of the mechanical shaft angle over the full 360 degree range. A converter is described for the linearization of these signals, enabling the angle to be determined using simple linear equations. The converter is based upon the difference between the absolute values of the transducer signals, together with a dedicated linearization technique. The converter provides a nearly perfect triangular signal from which the angle is determined unambiguously over the full range. The theoretical error of non-linearity may be cut down to 7/spl times/10/sup -4/degree. The principle and theory of operation, and computer simulation are given. The converter, full details of which are given, has been implemented using analogue electronic circuitry. The practical performance of the converter has been evaluated using a PC-based test rig. The converter was successfully tested with a commercial resolver. The experimental results obtained are in excellent agreement with theory and simulation.

172    Lei Zhu, K. Shida, "The measurement of plural tea information by fiber-optic sensor," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1941- 1944 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Since the optical fiber can react to various signals, such as temperature and pressure, it is applied to many measurement cases. We measure plural tea information using the multi-functional technique with the optical fiber. First, we measure the transmissivity (depth) and liquid-level of tea by the transparency from which air and tea differ using two optical fibers, second, along with temperature change, the temperature of the tea by the transmissivity of two optical fibers is measured.

173    R.Z. Cao, K.S. Low, A.Q. Liu, C. Hong, "A MEMS based variable optical attenuator," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1945- 1950 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a microelectromechanical variable optical attenuator (VOA) is described. The device is used to control the power in the all optical networks. Besides the advantage of low coupling loss, and the elimination of signal regeneration optoelectronics, it is compact, low cost and has good switching performance. In our laboratory, a shutter type VOA has been fabricated and setup for investigation. In this paper, the modeling and close loop control of the device are presented. Simulation and experimental results have shown that the proposed approaches improve the VOA performance.

174    P.F. Odgaard, M.V. Wickerhauser, "Discrimination among different kinds of surface defects on compact discs," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1951- 1956 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Compact disc players have problems playing discs with surface defects such as scratches and finger prints. The problem is that handling normal disturbances such as mechanical shocks etc, require a high bandwidth of the controllers which keep the optical pick-up focused and radial tracked on the information track on the disc. In order for the controllers to handle the surface defects it is required that they are non-sensitive to the frequency contents of the defect, since a defect can be viewed as a disturbance on the measurements. A simple solution to this problem is to decrease the controller bandwidth during the defect. However, due to the variation of defects a more adaptive control strategy would be preferable. In this paper the defects are categorised into three groups. A discriminator is designed, based on the local most discriminating basis vectors of the Karhunen-Loeve and Haar basis as well as the mean of defect groups vectors. In these basis the discrimination rule is simple. The defect in question is a member of the group it is closest too. The Karhunen-Loeve basis gives a correct classification rate of more than 85.7% with 3 basis vectors and the Haar basis of more than 94.6% with 5 basis vectors.

175    T. Senjyu, S. Tamaki, N. Urasaki, K. Uezato, H. Higa, T. Funabashi, H. Fujita, H. Sekine, "Wind velocity and rotor position sensorless maximum power point tracking control for wind generation system," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1957- 1962 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In order to perform maximum power point tracking control of wind power generation system, it is necessary to drive windmill at an optimal rotor speed. For that purpose, a rotor position and a wind velocity sensors become indispensable. However, from the aspect of reliability and increase in cost, rotor position sensor and wind velocity sensor are not usually preferred. Hence, wind velocity and position sensorless operating method for wind power generation system using observer is proposed in this paper. Moreover, improving the efficiency of the permanent magnet synchronous generator is also performed by optimizing d-axis current using the Powell method.

176    Hyungwoo Lee, Sunik Heo, Juho Kim, "Global false path-aware hierarchical timing analysis," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1963- 1965 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: As the integrated technology develops we can design the circuit with thousands of transistors. A hierarchical design Is unavoidable because of a huge circuit size. It is more important how we can consider hierarchically meaningful structure in circuit delay analysis. We computed more accurately the delay of circuit by adding the notation global false path to a previous hierarchical timing analysis. This paper presents the hierarchical timing analysis approach using functional relations considering global false path. Our algorithm utilizes the global false path, the functional relations between the modules. Therefore, the more accurate circuit delay can be obtained than the previous approach. Our algorithm is applied to ISCAS'85 benchmark circuits and carry skip adder. Our experimental results verify that the proposed algorithm is very effective for calculating the circuit delay.

177    Minwon Park, In-Keun Yu, "A study on the parameter evaluation method of solar cell," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1966- 1971 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: PV power generation, which directly converts solar radiation into electricity, contains a lot of significant advantages such as inexhaustible and pollution-free, silent and with no rotating parts, and size-independent electricity conversion efficiency. Positive environmental effect of photovoltaics is replacing electricity generated in more polluting way or providing electricity where none was available before. This paper shows the novel simple method to abstract the whole parameters of solar cell. In development, design and operation of PV power generation systems, a technique for constructing V-I curves under different levels of solar irradiance and cell temperature condition using basic characteristic values of PV module is required. Everyone who has done manual acquisition and analysis of solar cell I versus V data would agree that the job is tedious and time-consuming. A better alternative is to use an automated curve tracer to print out the I versus V curves and compute the four major parameters; V/sub OC/, I/sub SC/, FF, and /spl eta/. Generally, V-I curve tracer indicates only the commonly used solar cell parameters. However, with the conventional V-I curve tracer it is almost impossible to abstract the more detail parameters of solar cell ; A, R/sub S/ and R/sub Sh/, which satisfies the user, who aims at the analysis of the development PV power generation system; advanced simulation. In this paper, the proposed method gives us the satisfactory results to abstract the detailed parameters of solar cells; A, R/sub S/ and R/sub Sh/.

178    Yu-Chuan Su, Fan-Tien Cheng, Guo-Wei Huang, Min-Hsiung Hung, Taho Yang, "A quality prognostics scheme for semiconductor and TFT-LCD manufacturing processes," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1972- 1977 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A quality prognostics scheme for predicting the product quality during the semiconductor or TFT-LCD manufacturing processes is proposed in this work. This scheme considers the current production equipment parameters sensed during the manufacturing process and several previous quality data collected from the measurement equipment to predict the quality of the product in the future. This quality prognostics scheme is composed of a conjecture model and a prediction model. The conjecture model itself can also be applied for the purpose of virtual metrology. With this two-tier arrangement, the quality prognostics scheme becomes more applicable. The algorithms adopted by the conjecture model can be various and exchangeable. Basically, numerous algorithms of artificial intelligence and statistics may be applied. The selection criteria are based on the physics of the equipment and the property of the measured parameters. The prediction algorithms used in the prediction model are weighted moving average, neural network, or any algorithm with prediction capability. Besides, the quality prognostics scheme possesses a self-searching mechanism and a self-adjusting mechanism. Upon the new conjecture or prediction algorithm being selected, the self-searching mechanism will be activated. The self-searching mechanism will not stop until the best combination of various parameters/functions used by the conjecture algorithm or prediction algorithm is found. Then, the conjecture or prediction model enters the normal running mode. After a period of time, if the prediction accuracy exceeds an acceptable bound or the equipment properties are altered due to scheduled maintenance or part change, the self-adjusting mechanism is launched to tune the system parameters to bring the prediction accuracy within the acceptable bounds.

179    K. Tunlasakun, K. Kirtikara, S. Thepa, V. Monyakul, "FPGA-based islanding detection for grid connected inverter," Industrial Electronics Society Annual Conference, Vol.2 , pp. 1978- 1982 Vol. 2, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the development of a FPGA based islanding detection for grid connected inverter with simple under/over voltage and under/over frequency islanding detection algorithms. The design is based on the Xilinx chip XC4005E field programmable gate array (FPGA). The FPGA is used for all system logic function. This allows software development, testing, implementation and modification of logic circuitry without hardware modification. The FPGA monitor the under/over voltage and under/over frequency of utility grid and processed the value of voltage and frequency for turned on-off relay between grid connected inverter and utility grid. The results are provided to demonstrate the effectiveness of the design.

IEEE Industrial Electronics Society Annual Conference

  Industrial Electronics Society Annual Conference 

Vol.1 ,   2-6 Nov. 2004           Access to the IES Annual Conference on IEEE XPLORE     IE Transactions Home Page




1    Z. Nie, A. Emadi, Y. Chin, "A dSPACE control implementation for the standard three-phase boost rectifier," Industrial Electronics Society Annual Conference, Vol.1 , pp. 1- 5 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a simple control method based on the six-step SVM is proposed for standard three-phase boost rectifier. The principle is derived from the average model of the three-phase boost rectifier. Input logic circuit and output logic circuit are given by analyzing the six-step space vector modulation. dSPACE based control circuit verifies this method. Results of simulation and experimental verification are presented.

2    K.S. Low, K.L. Xhou, D.W. Wang, "Digital odd harmonic repetitive control of a single-phase PWM inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 6- 11 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a digital plug-in odd harmonic repetitive control scheme is proposed for a constant-voltage-constant-frequency (CVCF) single-phase PWM inverter. The approach occupies only half the data memory that a conventional repetitive controller required. Besides the advantage of simple implementation, it offers faster convergence of the tracking error. The proposed odd harmonic repetitive controller is a zero tracking error control scheme. Results are presented to validate the proposed approach.

3    Guan-Chyun Hsieh, Hung-Liang Chen, Jung-Chien Li, "Modeling and implementation of sigma-delta modulation controller for DC/AC inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 12- 17 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A sigma-delta modulation controlled DC/AC inverter is proposed. Modeling and analysis of sigma-delta modulation (SDM) controller are explored. The pulse width of the SDM formed by cycle-by-cycle integration loop is clearly described. System stability is studied by root-locus and Bode plot techniques. An approach to reducing the THD is conducted by Fourier analysis. A prototype of 1 kVA SDM controlled DC/AC inverter is designed and examined. Simulation and experiment are close to the theoretical predictions. The proposed inverter can provide high efficiency up to 90% under the rated power and still keep the total harmonic distortion (THD) without EMI filter within 2%.

4    Hyun-Ki Yoon, Sang-Kyoo Han, Jin-Sik Park, Myung-Joong Youn, "Zero-voltage switching two-transformer full-bridge PWM lossless diode-clamp rectifier for PDP sustain power module (IECON '04)," Industrial Electronics Society Annual Conference, Vol.1 , pp. 18- 23 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a zero-voltage switching (ZVS) two-transformer full-bridge (TTFB) PWM converter with lossless diode-clamp rectifier for a plasma display panel (POP) sustaining power module (PSPM). The TTFB has series-connected two transformers which act as an output inductor as well as a main transformer, i.e. as the forward and the flyback transformer. Although the doubled leakage inductor of the two-transformer make it easier to achieve the ZVS of the lagging leg switch along the wide load range, it instigates a serious voltage ringing across the output rectifier diodes, which would require the dissipative snubber circuit, cause the serious power dissipation, and increase the voltage stress across those diodes. To overcome these problems, a new lossless diode-clamp rectifier (LDCR) is employed as the output rectifier, which helps the voltage across rectifier diodes to be clamped at a half the output voltage (V/sub 0//2) or the output voltage (V/sub 0/). Therefore, no dissipative snubber for the rectifier diodes is needed and a high efficiency as well as a low noise output voltage can be realized. In addition, the clamping capacitor of the LDCR can help to considerably reduce the primary circulating current. The operations, analysis and design consideration of proposed converter are presented. Also, a 425 W, 385-170 V dc prototype is constructed and experimental results verified the validity of the proposed converter.

5    Hong-Je Ryoo, Geun-Hie Rim, Tae-Jin Kim, D.O. Kisck, "Digital-controlled single-phase unified power quality conditioner nonlinear and voltage sensitive load," Industrial Electronics Society Annual Conference, Vol.1 , pp. 24- 29 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric/electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply-voltage variation (sag or swell) at the load side, is presented in this paper. The operation and rating issues of the proposed single-phase unified power quality conditioner are highlighted too. To reduce the total cost, but to increase the performance, the system is fully digital-controlled using the fixed-point TMS320F240 digital signal processor. The performances of UPQC that is composed by shunt and series PWM controlled-converters have been verified on a laboratory prototype.

6    Seung-Yeol Oh, Young-Gook Jung, Young-Choeel Lim, "A two-phase dual-zero vector RCD-PWM (DZRCD) technique," Industrial Electronics Society Annual Conference, Vol.1 , pp. 30- 34 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A two-phase DZRCD (dual-zero vector RCD) technique is proposed to solve the problems of conventional two-phase RCD-PWM (random centered distribution PWM) which the discrete spectra in case of high modulation index (M) does not reduced considerably. In the proposed DZRCD technique, zero vector is selected as V(1 1 1) in case of M/spl ges/0.8. Also, zero vector is selected as V(0 0 0) if modulation index<0.8. For the implementation of the proposed method, a 16-bit micro-controller SAB C167 was used and the experiments were conducted with the 1.5 kW induction motor under no load condition. The experimental results show that the voltage and current harmonics are spread to a wide band area and that the acoustic switching noise is reduced by the proposed method.

7    K. Iwaya, T. Noguchi, "High-frequency switched mode power with small capacity filter inverters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 35- 40 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a high frequency switched mode power amplifier which incorporates small capacity filter inverter. PWM inverters require low-pass filters in order to reduce switching harmonics. However, in the high frequency systems such as class D power amplifiers, the cut-off frequency of low-pass filter must set at considerably high-frequency. Thus, harmonic distortion of the output voltage enlarges. Increasing output voltage level is effective to reduce harmonic distortion of the output voltage and low-pass filter size. The proposed systems are consisted of 5-level inverter and cascade connected several low voltage full bridge inverters without isolated DC power sources for filtering output voltage. The 5-level inverter generates a stepwise waveform with 5-level voltage and the low voltage filter inverter superimposes harmonic components to compensate for the voltage waveform distortion. Therefore, the proposed system can reduce total switching loss and can increase output voltage levels. In this paper, effectiveness of the proposed systems are verified through several experimental tests.

8    Z.M. Pe, P.K. Jain, P.C. Sen, "Robust controller design for high frequency resonant inverter system with voltage mode control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 41- 46 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we proposed a robust controller for high frequency resonant inverter. High frequency resonant inverter requires fast dynamic response and tight control of the output voltage. The component tolerance, load and line variation as well as small signal model inaccuracy all impose challenge in the controller design, while as such inverter feed open AC bus with dynamic load change, robust stability and robust performance become even important. We used the H/sup /spl infin// robust controller synthesis method to design a 3-order controller for the an APWM resonant inverter. Firstly uncertainty model of the inverter system was derived. A standard robust control problem was set-up and optimal controller was obtained and reduced to a 3-order controller, taking advantage of the Matlab robust toolbox. Simulation results for the closed-loop system under various perturbations verified the advantages of the proposed controller.

9    Z. Salam, Z. Ramli, "A DC-DC type bidirectional high frequency link inverter using center-tapped active rectifier," Industrial Electronics Society Annual Conference, Vol.1 , pp. 47- 50 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A high frequency link, transformer-isolated inverter is proposed. It is based on the bidirectional "DC-DC type" using center-tapped active rectifier at the secondary of the transformer. The topology requires a total of ten switches, with four of them operated at supply utility frequency. A 1 kW prototype is built to verify the performance of the inverter.

10    Min-Sung Yun, Woo-Cheol Lee, Inyoung Suh, Dong-Seok Hyun, "A new control scheme of unified power quality compensator-Q with minimum power injection," Industrial Electronics Society Annual Conference, Vol.1 , pp. 51- 56 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Voltage sags are one of the most frequently occurring power quality problems challenging the power systems today. The unified power quality conditioner (UPQC) is one of the major custom power solutions that are capable of mitigating the effect of supply voltage sags at the load or point of common coupling (PCC). A UPQC-Q employs a control method in which the series compensator injects a voltage that leads the supply current by 90/spl deg/ so that the series compensator at steady state consumes no active power. However, the UPQC-Q has the disadvantage that its series compensator needs to be overrated. Thus it cannot offers effective compensation. This paper proposes a new control scheme for the UPQC-Q that offers minimum power injection. The proposed minimum power injection method takes into consideration the limits on the rated voltage capacity of the series compensator and its control scheme. The validity of the proposed control scheme is investigated through simulation and experimental results.

11    Rong-Jong Wai, Chung-You Lin, Chia-Chin Chu, "High step-up DC-DC converter for fuel cell generation system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 57- 62 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Due to the electrochemical reaction, fuel cell has the power quality of low voltage as well as high current. However, the fuel cell stack with high output voltage is difficult to fabricate and its volume is overlarge. Besides, the output voltage of the fuel cell is varied easily with respect to the variation of loads. In order to satisfy the requirement of high-voltage demand, a high-efficiency DC-DC converter with superior voltage gain is one of the essential mechanisms in fuel cell applications. In this study, a newly-designed DC-DC converter utilized in the proton exchange membrane fuel cell (PEMFC) system is constructed on the basis of voltage-clamped and soft-switching techniques for alleviating the switching and conduction losses to further increase the conversion efficiency. The effectiveness of the proposed converter used for the PEMFC system is verified by experimental results.

12    Young Ki Oh, Sung Kyo Park, Byoung Hwan Lim, Chong Baek Park, "Improvement of characteristics of active-clamped ZVS forward converter with a synchronous rectifier," Industrial Electronics Society Annual Conference, Vol.1 , pp. 63- 67 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For power supplies of communication system, we propose an active-clamped zero-voltage-switching (ZVS) forward converter with a synchronous rectifier. This converter was designed and fabricated, and the power conversion efficiency was compared with a conventional forward converter having a reset winding with synchronous rectifiers. Here, they were operated on the conditions of input voltage of DC 48 V, output voltage of 5 V, output current of 10 A and switching frequency of 120 kHz. As a measurement result, the conversion efficiency of the proposed converter was 90.6% and it was average 3.1% higher than the conventional forward converter having a reset winding with synchronous rectifiers. If major components of a converter are carefully chosen by considering the switching characteristics and the driving circuit for ZVS is more stabilized, this proposed converter can be used to realize the converter with output voltage lower than 3.3 V, higher conversion efficiency, and higher output current.

13    R. Beguenane, M.A. Ouhrouche, A.M. Trzynadlowski, "Stator resistance tuning in an adaptive direct field-orientation induction motor drive at low speeds," Industrial Electronics Society Annual Conference, Vol.1 , pp. 68- 73 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel simple stator resistance estimation technique for high-performance induction motor drives is proposed. It makes use of a synchronously revolving reference frame aligned with the stator current vector, so that the resistance can be straightforwardly derived from the mathematical model of the induction motor. A sensorless direct field orientation scheme is employed to validate the proposed solution, with the drive operating in the critical area of low speeds. A combination of two observers is used: a Kalman-filter observer to estimate the rotor flux, and a MRAS observer for speed estimation. The stator resistance estimator alleviates the usual performance degradation of MRAS-based drives at low speeds, caused by the thermal drift of that resistance. Computer simulations, including realistic disturbances, show high effectiveness of the described approach. Comparison of performance of the drive with and without the proposed stator resistance estimator demonstrates a crucial role of that device.

14    Jul-Ki Seok, Dong-Choon Lee, "Frequency spectrum-based antiwindup compensators for high performance induction motor drives," Industrial Electronics Society Annual Conference, Vol.1 , pp. 74- 79 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a frequency spectrum-based antiwindup compensator for induction machine with proportional-integral (PI) type speed controller. The on/off condition of integral action is determined by the frequency domain analysis of machine torque command without a prior knowledge of set-point changes. There are no tuning parameters to be selected by users for antiwindup scheme. In addition, the dynamic performance of the proposed scheme assures a desired tracking response curve with minimal oscillation and settling time even in the change of operating conditions. This algorithm is useful in many high performance induction machine applications not to allow the oscillation and overshoot of speed/torque responses. The main idea can be extended to general applications such as chemical processes and industrial robots.

15    B. Shen, V. Low, B.T. Ooi, "Slip frequency phase lock loop (PLL) for decoupled P-Q control of doubly-fed induction generator (DFIG)," Industrial Electronics Society Annual Conference, Vol.1 , pp. 80- 85 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper describes an innovative slip frequency phase lock loop (PLL) which measures the rotor frequency /spl omega//sub R/ and the rotor speed /spl omega//sub m/ of a doubly-fed induction generator (DFIG). Both information are required in implementing sensorless control of DFIGs by rotor-side voltage-source converters. For decoupled P-Q control, it is necessary to align the rotor /spl gamma/-/spl delta/ axes to the axes of the stator. A new /spl gamma/-/spl delta/ axes aligner is also proposed. The information extracted are: (i) the rotor position (/spl omega//sub m/t+/spl delta//sub m/), (ii) the rotor speed /spl omega//sub m/, (Hi) the rotor frequency /spl omega//sub R/. Proofs of concepts and proofs of decoupled P-Q control of a wind turbine driven DFIG are presented from simulation studies.

16    T. Ahmed, K. Nishida, M. Nakaoka, Hyun Woo Lee, "Self-excited induction generator with simple voltage regulation scheme for wind energy," Industrial Electronics Society Annual Conference, Vol.1 , pp. 86- 91 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a three-phase induction-machine-based wind power generation scheme is proposed. This scheme uses a low-cost three-phase diode bridge rectifier circuit connected to the induction machine via the AC load voltage regulator (AC-LVR) to transfer DC power with voltage regulation. The AC-LVR is used to regulate smoothly the output voltage of the three-phase self-excited induction generator (SEIG) connected to the diode bridge rectifier circuit. The excitation to the three-phase SEIG is supplied by a static VAr compensator (SVC) composed of the fixed excitation capacitor and the thyristor controlled capacitor. This simple method for obtaining a full variable-speed wind turbine system by applying a bi-directional power converter to a conventional induction generator is useful for wind power generation with a wide speed variation. The dynamic performance responses and the experimental results of a 5-kW 220-V three-phase SEIG directly connected to a three-phase diode bridge rectifier circuit at various loads are presented. Moreover, the experimental results of the PI closed-loop feedback voltage regulation scheme prove the practical effectiveness of this simple proposal for a wind turbine system.

17    N. Yamaguchi, M. Hasegawa, S. Doki, S. Okuma, "A stabilization method for speed sensorless vector controlled induction motors at zero frequency operating condition with multirate adaptive observer," Industrial Electronics Society Annual Conference, Vol.1 , pp. 92- 97 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a stabilization method for speed sensorless vector controlled induction motors at zero frequency operating condition using a new configuration of the adaptive observer. In speed sensorless vector controlled induction motors, it has been pointed out that the speed identification system becomes unstable at zero frequency operating condition. This problem is caused by lack of the knowledge of the rotor side of induction motors, and the disturbance such as a parameter mismatch of the stator quantities at zero frequency operating condition. In this paper, a new configuration of the adaptive observer, which stabilizes speed sensorless vector control of induction motors without injecting a high frequency or an excitation signal, is proposed. Firstly, causes of unstable speed identification in the conventional speed sensorless vector control system are considered. Next, a configuration of the adaptive observer based on multirate control in order to stabilize the speed sensorless system at zero frequency operating condition is proposed. Finally, validity of the proposed method is shown by experimental results.

18    L.A. Pereira, C.C. Scharlau, L.F.A. Pereira, E.J.F. Haffner, "Model of a five-phase induction machine allowing for harmonics in the air-gap field. Part I. Parameter determination and general equations," Industrial Electronics Society Annual Conference, Vol.1 , pp. 98- 103 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the mathematical model of a five-phase induction machine including the effects of higher space and time harmonics in the air-gap field. It is well known that these harmonic waves play a decisive role in the behavior of machines with more than three phases. This first part of a two-part paper discusses the calculation of the main parameters where these are derived analytically, and results are compared with values obtained by finite element analysis. The main parameters used in deriving the model are the self and mutual stator and rotor inductances. Based on the field distribution produced by stator and rotor, all the field harmonics are included in a direct and simple way in the self-inductances. The mutual inductances are obtained from a Fourier-series description of the air-gap field, resulting in a different inductance for each harmonic field. A discussion of the general equations for the induction machine follows. In the second part of the paper, these equations are simplified using known axis transformations, which result in equivalent d-q models and circuits for given harmonic groups. In their final form, the equations and corresponding equivalent circuits are well suited for purposes of simulation of five-phase machine behavior and developing new control strategies including higher space and time harmonics.

19    Byeongil Kim, Yushin Chang, Joongeup Keh, Heegwon Ha, Manhyung Lee, "Design of 6-DOF attitude controller of hovering model helicopter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 104- 110 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For a maneuvering unmanned autonomous helicopter, it is necessary to design a proper controller of each flight mode. In this paper, overall helicopter dynamics is derived and hovering model is linearized and transformed into a state equation form. However, since it is difficult to obtain parameters of stability derivatives in the state equation directly, a linear control model is derived by time-domain parametric system identification method with real flight data of the model helicopter. Then, two different controllers-a linear feedback controller with proportional gains and a robust controller-are designed and their performance is compared. Both proposed controllers show outstanding results by computer simulation. These validated controllers can be used to autonomous flight controller of a real unmanned model helicopter.

20    S. Tungpataratanawong, K. Ohishi, T. Miyazaki, "High performance robust motion control of industrial robot parameter identification based on resonant frequency," Industrial Electronics Society Annual Conference, Vol.1 , pp. 111- 116 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Controller design for industrial robots is normally based on the model of the mechanical system. The proper parameters of the model cannot be obtained by the parameter identification based on only manipulator force and motion measurements. In this paper, the resonant frequency characteristic of the flexible joint is employed to identify the proper parameters of the two-inertia model of each joint of the robot. These parameters are used in independent-joint controller design for conventional PD control scheme and robust control scheme. The nominal inertia and the nominal spring constant based on the proposed identification method contributes more control accuracy in comparison with the conventional identification method which uses both the constant speed test and the acceleration speed test. Moreover, the two control schemes, which are the proposed robust motion control method and the conventional motion control method, are applied to the tested robot manipulator to comparing the efficiency of the identified parameters and implemented control schemes.

21    E. Ohashi, K. Ohnishi, "Variable compliance control based on soft-landing trajectory for hopping robot," Industrial Electronics Society Annual Conference, Vol.1 , pp. 117- 122 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, soft-landing of hopping robot is considered. In the landing phase, the robot is affected by reaction force from the ground. In order to achieve a desired COG (center of gravity) position at bottom, the soft-landing trajectory is introduced. This trajectory was planned to minimize impulse and maximum force from the ground. However the trajectory is not sufficient to apply to actual robots because the robots cannot adapt unknown (or inconstant) external force. Therefore, in this research, we propose novel variable compliance control with soft-landing trajectory. Compliance parameters are modified based to the soft-landing trajectory so that transition from force control to position control can be accomplished smoothly. While force control should be applied to absorb the impact from the ground position control should be applied at bottom since the robot should track the desired trajectory for the next hop. With this method, transition from force control at touchdown to position control at bottom can be achieved appropriately. The robot can land with suppressing the impact force with accomplishing the desired COG position at bottom.

22    Kitak Ahn, Wan Kyun Chung, Youngil Yourn, "Arbitrary states polynomial-like trajectory (ASPOT) generation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 123- 128 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new method of smooth trajectory generation which can replace the typical polynomial type trajectory was suggested. Position in the form of a 5/sup th/ order polynomial is often used with constraints of initial and final states. A simple polynomial-like trajectory generation method based on zero final state constraints was suggested and named ZSPOT. There is a progress about it by allowing nonzero final constraints and therefore named ASPOT. Using this general concept, ZSPOT is modified more practically. Without watching control issues behind these methods, they are shown only as a new trajectory generation method which is easy to program and can be applied to most systems we handle. The effects of ASPOT are shown through experiments.

23    Sungkwun Kim, Dong-Kwan Yi, Kun-Ku Oh, "Development of an unwinding machine for a fine gold wire using relative motion control method," Industrial Electronics Society Annual Conference, Vol.1 , pp. 129- 133 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new unwinding machine is developed for a fine gold wire used in wire bonding machine for semiconductor assembly process. The tension of the fine gold wire should be kept constantly to avoid or reduce wire disconnection during the operation. A new relative motion control methodology of a following system to an independent leading system is applied to this machine to control the tension of the line. The unwinding machine developed in this research controls the tension of 2/spl plusmn/0.1 g during unwinding the wire for a winding machine. The experimental results show the unwinding machine follows the independent motion of the winding machine keeping the tension requirement of 2/spl plusmn/0.1 g.

24    Sang Min Kim, Byoung Joon Ahn, Ju Yong Choi, Yu Shin Chang, Won Bog Lee, Dong Kuk Cha, Jeong Hyun Moon, Man Hyung Lee, "The modeling and control of a Web guide process in cold rolling mill," Industrial Electronics Society Annual Conference, Vol.1 , pp. 134- 139 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: There are many intermediate Web guides in cold rolling mills process such as CRM (cold rolling mill), CGL (continuous galvanizing line), EGL (electrical galvanizing line) and so on. The main functions of the Web guides are to adjust the center line of the Web (strip) to the center line of the steel process. So they are called CPC (center position control). Rapid process speed cause large deviation between the center position of the strip and the process line, too much deviation is not desirable. So the difference between the center position of the strip and the process line should be compensated. In general, the CPC of the Web is obtained by the hydraulic driver and electrical controller. In this paper, we propose modeling and several controller designs for Web-guide systems. We model the Web and guide by using geometrical relations of the guide ignored the mass and stiffness of the Web. To control the systems, we propose PID controllers with their gains tuned by the Ziegler-Nichols method, the H controller model-matching method, and the COM (coefficient diagram method). COM is modified for high order systems. The results are verified by computer simulations.

25    T. Shibata, K. Wada, K. Tanie, Wan Kyun Chung, Youngil Youm, "Subjective evaluation of seal robot in Gyeonju, Korea," Industrial Electronics Society Annual Conference, Vol.1 , pp. 140- 145 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the result of international subjective evaluation of seal robot in terms of human-robot interaction. The seal robot named Paro was displayed at the exhibition held at Gyeongju Gymnasium in Gyeongju, Korea from Oct. 2/sup nd/ to 5/sup th/, 2003. 180 visitors evaluated the robot by answering questionnaires. The result showed that the robot was highly evaluated, and were very similar in those of Japan that were obtained in previous study. In addition, important factors such as "favorable impression by contacting," "easiness of talking to Paro" and "favorable impression by appearance" that will become key points in robot evaluation were extracted from the results of the principal component analysis.

26    Y. Takahashi, T. Suzuki, S. Hisamitsu, Y. Matsuo, S. Yamawaki, S. Isonuma, "Simple humanoid robot for university education," Industrial Electronics Society Annual Conference, Vol.1 , pp. 146- 151 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the fabrication of small biped robots aiming for the use as a teaching material at universities. Easily available cheap key components were used to fabricate the robot systems; a servomotor of a toy and a PIC microcomputer, for example. Three types of the biped robot systems were fabricated.

27    Jae Hun Kim, Jin Oh Kim, "A task management design for task-based control architecture for personal robots," Industrial Electronics Society Annual Conference, Vol.1 , pp. 152- 156 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Nowadays, many robots are used in home environments. These are servants for people and personal usage. So, we named these robots personal robot. As the possible applications for personal robots increase and involve more complicated environments and tasks, they become to have very complicated kinematics configurations and need more appropriate control architectures. Previous control architectures have fixed and simple configurations that are optimized for specific applications or with limited flexibility. Consequently, they fail to provide the flexibility necessary for various robot kinematical configurations as well as various tasks. To overcome this problem, we proposed a new personal robot platform and task-based control architecture called "supervised hybrid architecture (SHA)". This platform is composed of reconfigurable modules. SHA is based on supervised organization and distributed arbitration of hybrid controls of reconfigurable deliberative and reactive modules. It is composed of upper level hybrid control for high-level intelligence to interact with human and to plan tasks, as well as lower level hybrid control to allow low-level intelligence for prompt reaction in each robot configuration module. Through these double layers of the hybrid controller, we could easily provide the flexibility needed for so many different kinematical configurations and tasks. In this paper, we will show that how organize this architecture and how operate various tasks in SHA. We will design the task manager for SHA. This manager uses decision tree to make sub tasks and task library to select sequence of the sub tasks. Decision tree checks current status of the robot and decides robot to do. We will show simple example for the proposed architecture are implemented in the platform and tested to show how it works successfully.

28    S. Puntunan, M. Parnichkun, "Attitude and heading control of an autonomous flying robot," Industrial Electronics Society Annual Conference, Vol.1 , pp. 157- 162 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper detail the developments of a flying robot based on a radio controlled helicopter. The designed goal is to have a flying robot to maintain its attitude and heading that are commanded from the operator. The focus of this paper is on the development of a simple multiloop SISO attitude and heading controllers for control the highly nonlinear plant such as this small-sized helicopter for closed loop system identification in the future. The flight experiments are also presented at the end of this paper to show the results of the control algorithm.

29    Seok Won Jeong, Ho Chul Lee, Jae Weon Choi, "Time-varying control of nonlinear systems with constraints and application to a wafer transfer robot," Industrial Electronics Society Annual Conference, Vol.1 , pp. 163- 168 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The real plant is generally expressed as time-varying nonlinear dynamic equation with several constraints. This paper deals with this nonlinear systems by dynamic inversion and LTV (linear time-varying) control theory using time-varying eigenvalue concept. Dynamic inversion methods can't guarantee robustness with respect to disturbances and modeling uncertainties. So LTV control theory for error dynamics is used to solve this problem. In order to apply this control systems, command shaping filter to make admissible command trajectory is needed. We can get this trajectory by using TVB (time-varying bandwidth) filter. It makes us get admissible trajectory to be satisfied with constraints by adjusting the filter bandwidth. This paper applies this control systems to a wafer transfer robot with input and linear acceleration limits.

30    S.P.M. Assal, K. Watanabe, K. Izumi, "Cooperative fuzzy hint acquisition for avoiding joint limits of redundant manipulators," Industrial Electronics Society Annual Conference, Vol.1 , pp. 169- 174 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a back propagation neural network (NN) is presented for the inverse kinematics of redundant manipulator with joint limits. Since the inverse kinematics has infinite number of joint angle vectors, a fuzzy neural network (FNN) is designed to provide an approximate value for that vector. This vector is fed into the NN as a hint input vector to guide the output of the NN within the self-motion. This FNN is designed based on cooperatively controlled each joint angle in the sense that it stops the motion on the critical axis at its limit in the expense of more compensation from the most relaxed joint to accomplish the task. The joint velocity limits as well as the joint limits are incorporated in this method. Simulations are implemented based on four-link redundant manipulator to show the effectiveness of the proposed control system.

31    Y. Takahashi, T. Suzuki, Y. Obuchi, K. Kusakabe, K. Takahashi, T. Sakamoto, "Motion analysis of transfer aid system aiming for development of self-transfer aid system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 175- 180 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A simple self-transfer aid robotic system is proposed, and motion analysis of a transfer aid system is presented in this paper. A person with weak leg muscles who uses a wheel chair is assumed to be the target user. By using the self-transfer aid robotic system, a user can transfer between a wheel chair and a toilet, for example. The proposed self-transfer aid robotic system is a two DOF system of a single link robotic arm with a saddle on the top, and a horizontal rotation mechanism driven manually. A user puts his/her belly on the saddle of the robotic arm, and then the robotic arm lifts the user's body. After rotating the user's body, the robotic arm lowers the user's body. The experiments on the burden measurements to human were conducted to design a simple self-transfer aid robotic system. Considering the experimental results, the self-transfer aid robotic system was fabricated.

32    G. Willmann, D.F. Coutinho, L.F.A. Pereira, F.B. Libano, "Robust control design for uninterruptible power systems," Industrial Electronics Society Annual Conference, Vol.1 , pp. 181- 186 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a robust control strategy for uninterruptible power systems (UPS) based on the linear matrix inequality (LMI) framework. Taking into account the average model of the UPS, a state feedback controller is proposed that assures the local stability of the closed-loop system for all admissible load variation while minimizing an upper-bound on the 2-norm of the input-to-output operator. A real-life example is used to demonstrate the approach.

33    K. Josh, A. Behalf, A.K. Jain, N. Mohan, "A comparative study of control strategies for fast voltage regulation with STATCOMs," Industrial Electronics Society Annual Conference, Vol.1 , pp. 187- 192 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a comparison of linear and nonlinear control strategies for a STATCOM to act as an instantaneous reactive current source. The STATCOM is modeled as a three phase inverter along with a DC bus and inductive line-side filters. The dynamic response of the DC bus voltage is limited by the allowable magnitude of charging and discharging currents inside the STATCOM. The linear controller proposed is designed using LQR for the small-signal STATCOM model. The nonlinear controller is designed using a Lyapunov based strategy. Large signal analysis is presented for the nonlinear controller to show exponential regulation of the system states. Simulation results of the controlled STATCOM integrated with a distribution system model compare performance of the controllers designed.

34    I. Cevantes, J. Alvarez-Ramirez, "A simple chaos control strategy for DC-DC power converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 193- 198 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this work, the boost converter has been taken as a benchmark to show how a simple control law can lead to chaos elimination and equilibrium point stabilization. In this way, we have shown that its possible to design a linear feedback controller that ensures the stability and reliability of the system under the action of current programmed control (CPC) or voltage programmed control (VPC). The proposed strategy has the advantages of being simple, efficient and easy to implement. Furthermore, the proposed controller does not require any information about unstable periodic orbits of the system. Performance and robustness of the controller are evaluated via numerical simulations.

35    I. Cervantes, J. Alvarez-Ramirez, "Habituating control of quasiresonant converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 199- 203 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The aim of this paper is to propose a class of parallel frequency-PWM control for quasiresonant converters (QRC), known as habituating control. The motivation of this control relies on the necessity of operating at both minimum energy losses and minimum size conditions (high-frequency), which cannot be satisfied by frequency modulation or PWM alone. This controller has the advantage of being robust against control saturation and the performance can be chosen by modifying a objective function. Furthermore, the proposed strategy is designed to provide robust stabilization in spite of model uncertainty and its performance is verified through an experimental application in a boost type QRC.

36    K.W.E. Cheng, Y.L. Ho, S.L. Ho, K.P. Wong, N.C. Cheung, T.K. Cheung, "Investigation of voltage dip restorer using square wave inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 204- 208 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The concept of square wave compensation is studied for the application to the voltage dip restorer in this paper. Both single square wave and dual square wave are used in this analysis. Both methods have shown to have a fast dynamic response as compared to sinusoidal compensation. The dual square wave can also compensate for the zero-crossing and the distortion is small. Experimental results confirm the proposed method.

37    H. Komurcugil, "A PI-type self-tuning fuzzy controller for DC-DC boost converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 209- 214 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a PI-type self-tuning fuzzy control (STFC) strategy is presented for a DC-DC boost converter. The STFC strategy tunes the output gain on-line by using an updating factor that is generated by using a second rule base. The tuning process is made according to the current trend of the controlled converter. The second rule base for tuning the output gain is defined on error and its derivative (change of error) of the controlled variable using membership functions. In order to show the validity of the STFC, the closed-loop system has been simulated against step changes in the load. The results obtained by the STFC approach are compared with those obtained by conventional fuzzy controller (FC) method in terms of several performance measures such as overshoot and settling time. An experimental study is also presented to support the theoretical considerations.

38    M.Z. Youssef, P.K. Jain, "A review and performance evaluation of control techniques in resonant converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 215- 221 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents different control techniques that are frequently applied in the resonant converters. The paper first discusses each control technique and then gives quantitative comparison of such techniques to highlight their merits and demerits. A full bridge series parallel resonant converter with an inductive output filter is taken as a study case for this comparative study. The different control techniques include: variable frequency (VF) control, phase shift modulation (PSM) control, self-sustained oscillation (SSOC) control, self-sustained phase shift modulation (SSPSM) control, and optimal control (sometimes called linear quadratic regulator LQR). The comparative study illustrates the effect of each controller on the converter rating, transient response, the allowable range of zero voltage switching (ZVS), and the range of the switching frequency variation. It is shown in the paper that the traditional linear controllers offer good performance at one operating point only while the nonlinear controllers, can improve robustness, reliability, and dynamic performance over a wide range of operation.

39    M. Shoyama, F. Deriha, T. Ninomiya, "Resonant boost switched capacitor converter with high efficiency," Industrial Electronics Society Annual Conference, Vol.1 , pp. 222- 226 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Conventional switched capacitor converters have an inherent drawback that their efficiency is much decreased as the output current is increased. This inherent drawback is due to a periodical forced charging and discharging operation in the internal switched capacitors accompanied by a large capacitor current, so that their efficiency can not be increased by decreasing its internal resistance. As a result, conventional switched capacitor converters have been limited to be used with a very small output current. To solve this problem we presented some novel switched capacitor converter topologies that use a resonant operation instead of the forced charging and discharging operation. Their advantage over conventional switched capacitor converters is a high efficiency even in a high output current region. In this paper, the operation analysis and steady-state characteristics are described in detail for a double boost type switched capacitor converter, and they are confirmed by experiments.

40    Z.M. Ye, P.K. Jain, P.C. Sen, "Two stage resonant inverter for AC distributed power supply-full control of output voltage magnitude and phase angle," Industrial Electronics Society Annual Conference, Vol.1 , pp. 227- 232 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Paralleling of multiple resonant inverters is necessary for AC distributed power supply system. However, the multiple module operation (MMO) requires tight regulation of the output voltage of both amplitude and phase angle. Voltage control mode (VCM) has effective control over the amplitude of the output only. Perturbation, component tolerance and other forms of uncertainties cause phase discrepancy in the output voltages of the modules. Such inverters when connected in parallel produce huge circulating currents because the ac bus impedance is very small. In this paper, a new concept of phase angle control mode (PCM) is proposed which is simple but effective for resonant inverter phase angle regulation. A two stage resonant inverter with a buck converter as front-end and a half bridge resonant Inverter in cascade is proposed with dual loop control (OLC) over the outputs of inverters. The half bridge resonant inverter regulates the voltage phase angle by PCM loop, while the buck converter regulates the voltage magnitude by a VCM loop respectively. Thermal losses are distributed in two stages and wide range of zero voltage switching (ZVS) is possible for wide range load and any kinds of load impedance. Because of the half bridge inverter operating with 0.5 duty ratio and the series parallel resonant network has high quality factor and high order, the output voltage has the best waveform quality. Since all the phase angles and magnitudes of the modules are tightly controlled, circulating current is minimized in MMO, therefore the system efficiency is improved. Simulations for both steady state and transients verify the proposed control and the analysis.

41    C. Chakraborty, S. Dalapa, S. Ray, "Dynamic pulse modulation: a technique to control resonant DC/DC converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 233- 238 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new method to control the voltage output of the resonant DC/DC converter is presented. The technique is based on either gating (i.e. turning on) the switches following normal sequences or keeping the switches ideal by suppressing the pulses to the base/gate drive circuit. Thus, when the switches operate, they all operate in proper sequence at constant frequency or none of the switches operate at all. Therefore, the voltage output of the converter may easily be controlled by adjusting the time of the pulse suppression. The superiority of the control technique over pulse width modulation and frequency modulation has been highlighted. The technique may be implemented for a wide range of half-bridge/full-bridge load resonant and quasi-resonant converter topologies. In this paper a series resonant half-bridge network is considered as an example. A simple design method for the converter is also discussed. The results from the experiments show excellent voltage regulation through out the entire range of load variation for the series resonant converter. The method is also applied for the parallel resonant converter and excellent regulation is again confirmed.

42    Z.M. Ye, P.K. Jain, P.C. Sen, "Two stage resonant inverter for AC distributed power supply," Industrial Electronics Society Annual Conference, Vol.1 , pp. 239- 244 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the topology aspects of a two-stage high frequency resonant inverter consisting of a buck converter and a half bridge series/parallel resonant inverter. The resonant inverter has the advantages of better waveform quality, zero voltage switching adaptability to both inductive and capacitive load, and high efficiency. Most importantly, the phase angle of this resonant inverter can be controlled independently from the voltage magnitude control, allowing for multiple module operation in parallel. The design of high efficiency, fast dynamics first stage converter is the key of the whole system performance. In this paper, a zero voltage transition (ZVT) based two-switch buck converter is proposed. By using an auxiliary circuit consisting of auxiliary switch, inductor and capacitor, the current transition from the lower switch to the upper switch can be accomplished with zero voltage. Prior to turning on the upper switch, the auxiliary circuit Is turned on with zero current switching. The upper switch flows negative current as the auxiliary circuit current exceeds the buck inductor current, therefore the anti-parallel diode conducts before the gate signal applies to the upper switch. The lower switch has zero voltage switching naturally. The interaction of the ripples of the fist stage buck converter with the second stage output voltage harmonics of the inverter Is also investigated.

43    Rong-Tai Chen, Yung-Yaw Chen, "Simplify modeling and implement of a hybrid resonant converter operating in DCM and CCM with state feedback control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 245- 250 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A state plane approach to the steady state analysis and design of the high-order hybrid resonant converter operated in the CCM and DCM is presented. The sampled-data approximated dynamic model is also obtained. A state feedback control technique that can be easily implemented is proposed to improve the stability and dynamic characteristic of resonant converters. A prototype unit has been built to verify the theoretical results. The experimental results confirm the validity of the proposed control.

44    Bo Yin, R. Oruganti, S.K. Panda, A.K.S. Bhat, "A novel instantaneous power control strategy for a PWM rectifier under unbalanced input voltage conditions," Industrial Electronics Society Annual Conference, Vol.1 , pp. 251- 256 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Instantaneous power regulation is an effective way to improve the performance of a PWM rectifier operating under unbalanced input voltage. By properly presetting current commands, this approach can maintain the desired performance features normally achieved only under ideal balanced operating conditions. These desirable performance features include sinusoidal input current at a near unity power factor, nearly constant DC output voltage with a small output capacitor and also fast dynamic response. However, the relationship between power and current in an AC to DC PWM rectifier is highly nonlinear under unbalanced operating conditions and it is not normally clear that a solution to the nonlinear system fulfilling all of the desirable requirements exists. The uniqueness and existence of a solution for such a nonlinear system is difficult to demonstrate. This paper presents a novel instantaneous power control strategy in which current commands are well regulated so as to distribute input power instantaneously and appropriately to the DC load and to the synchronous inductances while maintaining a constant DC voltage and sinusoidal input currents. A good feature of the proposed method is that the current commands are given by a set of simple equations, which can be easily implemented. Also, the simplicity of the equations avoids complex mathematical arguments for demonstrating uniqueness and existence of the solutions. It is shown also that near unity power factor operation can be achieved with the proposed scheme. Experimental results demonstrate that the scheme fulfils all the objectives of a high performance controller.

45    A. Fratta, G. Griffero, S. Nieddu, "Comparative analysis among DSP and FPGA-based control capabilities in PWM power converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 257- 262 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: PWM power converters are close to be mature for standard diffusion. New FPGA technologies could now realise at best the digital control key-points: flexible performance and time to market. The paper deals with the new digital control properties of FPGA-based techniques. On the basis of reference structures, a comparative analysis is carried-out trading-off dynamic performances and immunity to PWM environment. All possible sampled control or DSP techniques are firstly analysed and compared to each other. A breakthrough concept for FPGAs is defined, definitely solving for PWM feedback immunity by practical over-sampling and parallel processing while improving dynamic performances. Simulation tests and the application of dead-beat control clearly point-out the respective dynamic properties.

46    Tae-Won Chun, Jung-Ryol Ann, Jae-Yoo Yoo, Chel-Woong Lee, "Analysis and control for linear compressor system driven by PWM inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 263- 267 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, the linear compressors with the free piston driven by the linear motor have widely attention in the cooling apparatus such as a refrigerator due to high efficiency. The method of using triacs as a linear motor drive is not satisfactory to improve the efficiency of the linear compressor. In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency and power factor are investigated with the variations of both mechanical resonant frequency and electrical resonant frequency. Through simulation and experimental studies, the performance of both the stroke and angle controls for improving the efficiency of the linear compressor is verified.

47    Yen-Shin Lai, Wei-Hwa Rao, "Design of an integrated circuit of PWM controller for three-phase inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 268- 273 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper contributes to the circuit design of a PWM control IC for three-phase inverter. The circuit realizes both deterministic and random PWM techniques into a control IC. Based upon the developed circuit code programmed in VHDL, the designed PWM control integrated circuit (IC) can be incorporated into system-on-a-chip for the particular kind of inverter control; and thereby contributing to fast time-to-market without any domain knowledge of PWM control in prior. Experimental results are presented to confirm the circuit design.

48    Rae-Young Kim, See-Young Choi, In-Young Suh, "Instantaneous control of average power for grid tie inverter using single phase D-Q rotating frame with all pass filter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 274- 279 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a new instantaneous power control method using the rotating frame with an all pass filter for a single-phase grid tie inverter. The recently proposed single-phase rotating frame is reanalyzed based on the phasor notation that has been widely used to understand linear electrical circuits and then the relationship between them is defined. A grid tie inverter circuit model with a LCL filter is derived in a single-phase rotating frame. A novel average power control method with an all pass filter suitable for digital implementation is introduced. Various results from simulations are shown to verify the proposed scheme and actual experiments taken from a 3 kW grid tie inverter will be carried out in a near future.

49    C. Cecati, A. Dell'Aquila, A. Lecci, M. Liserre, V.G. Monopoli, "A discontinuous carrier-based multilevel modulation for multilevel converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 280- 285 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Multilevel modulators based on carrier shifting reach their minimum harmonic content only through asymmetrical sampling and proper phase shifting. Since their implementation is critical for microcontrollers and DSP's peripherals, field programmable gate array (FPGA) becomes attractive because it allows the design and realization of "ad hoc" digital modulators with the desired number of timers. On the other hand discontinuous modulation, poorly investigated in single-phase systems, may lead to results similar to those of asymmetrical carrier-shifted modulation, but with less implementation burden. When modulation index is near unity (typical in active rectifier applications), the discontinuous modulation can outperform other choices. In this paper a new single-phase multilevel modulation technique is proposed, analyzed and compared with other multilevel modulation techniques. The implementation of the considered multilevel modulations using standard microcontrollers is discussed and the use of FPGA is proposed and analyzed.

50    Bum-Sik Kim, Won-Hyun Oh, Eun-Chul Shin, Sam-Jun Seo, Sang-Bin Lee, Ji-Yoon Yoo, "Current control method using a double band hysteresis," Industrial Electronics Society Annual Conference, Vol.1 , pp. 286- 290 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a study on the double-band hysteresis current controller of the STATCOM (static synchronous compensator) used for reactive power compensation on a distribution network. Hysteresis controllers are intrinsically robust to system parameters, suitable for simple implementation and exhibit very high dynamic response. But in D-STATCOM, the current control using a conventional hysteresis controller has the disadvantage to be high switching frequency. In addition, the current error is not strictly limited. Therefore, in this paper, to reduce the switching frequency and current error, a double-band hysteresis current controller in stationary reference frame is proposed. The proposed double band hysteresis current control system was testified by the Borland C++ program and demonstrates the advantage of the proposed hysteresis current control method.

51    M.Z. Youssef, P.K. Jain, "A new ultra fast variable frequency self-sustained oscillation 48 V voltage regulator module," Industrial Electronics Society Annual Conference, Vol.1 , pp. 291- 296 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the performance and design of a new variable frequency 48V/spl bsol/1V voltage regulator module (VRM). Self-sustained oscillation control (SSOC) operation is used to achieve voltage regulation and high efficiency from no load to full load. The SSOC provides this VRM with a maximum operating frequency nearly equal to the minimum switching frequency of the variable frequency (VF) controller. This allows a high frequency operation of 620 kHz at full load and up to 910 kHz at no load. The SSOC controller proved to be a robust towards step disturbances with a small over/undershoot of less than 20 mV with an ultra high current slew rate of 1A/ns. Derived steady state characteristics provide a base for the design guidelines. PSIM simulation results are presented to validate the suggested work.

52    I. Ando, F. Toyoshima, "Development of high efficiency control method for common leg converter using golden section method," Industrial Electronics Society Annual Conference, Vol.1 , pp. 297- 302 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes about development of high efficiency control method for the common leg converter using golden section method. The characteristics of this system are obtained as follows. (1) This system realizes high efficiency, small size, lightweight and low cost, because the adopted conversion circuit is consisted of the common leg type single phase converter/inverter. (2) The converter/inverter system achieves to high efficiency based on the current and voltage follow up control with golden section method in real time. Golden section method is calculated to optimal output voltage of the every legs for get maximum efficiency under the calculated switching and the conducting losses and the desired output voltage of converter/inverter. As a result, it is not only obtained the excellent performances such as 99% power factor, over 94% efficiency, sinusoidal source current and output line voltage but also applied to the three phase system and the active filter.

53    H. Muraoka, M. Nakaoka, K. Sakamoto, "Soft-switching PWM-PDM controlled high-frequency link DC power converter operating at battery input," Industrial Electronics Society Annual Conference, Vol.1 , pp. 303- 307 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a innovative prototype of PWM soft-switching DC-DC forward type converter designed for specific low voltage large current condition at 24 V battery input. To achieve soft-switching, prototype of ZCS PWM DC-DC forward type converter applies additional control mode at partial operating area. The proposed converter is controlled by dual modulation as PWM-PDM at low duty operation. The soft-switching forward converter controlled PWM-PDM dual control scheme which can efficiency operate over wide load ranges under conditions of ZCS and active voltage clamped switching is established.

54    S. Abe, T. Ninomiya, J. Yamamoto, T. Uematsu, "Transient response comparison of voltage mode and current mode control on output-inductorless two-stage DC-DC converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 308- 312 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The two-stage DC-DC converter is developed for power supply of telecommunication application. This converter consists of a buck topology in the first stage and a half-bridge topology in the second stage. In order to reduce the system order, the output inductor is removed form this topology, then this system can be treated as a second-order system in approximation. As a result, the stability and the transient response are improved. Further improvement is required. This paper presents the effect of current mode control on the transient response in an output-inductorless two-stage DC-DC converter. As a result, output voltage drop is reduced by around 25% and the settling time is reduced by around 36% when compared with the voltage feedback control, and the effectiveness of the current mode control is experimentally confirmed.

55    M.Z. Youssef, P.K. Jain, "Performance and design of a novel constant frequency 48 V regulator module," Industrial Electronics Society Annual Conference, Vol.1 , pp. 313- 318 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel 48V/1V voltage regulator module (VRM) suitable for ultra fast telecom applications with an extended input voltage range. A new split control scheme is used to fasten the transient response to 1A/ns with /spl plusmn/2.5% voltage regulation. Each side of the isolating transformer has its own control loop to eliminate the delay time caused by the opto-coupler. Feed forward phase shift modulation (FFPSM) control is used to precisely regulate the input voltage at the primary side. Self-sustained oscillation controller (SSOC) is used to compensate for the load variations on the secondary side. Design procedure for a 100W VRM prototype is given, based on the Matlab developed analytical guidelines. The performance characteristics are shown to satisfy the design specifications through the simulation results.

56    T. Chandra Sekhar, B.P. Muni, "Analysis of self-excited induction generator by spiral vector theory," Industrial Electronics Society Annual Conference, Vol.1 , pp. 319- 323 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Self-excited induction generator (SEIG) is widely used for power generation in remote location. This paper attempts to unify the steady-state and transient analysis of SEIG using spiral vector theory. Normally phasor notations are used for steady state analysis; instantaneous phase variables, two axes or space vector approaches are used for transient analysis of AC circuits or machines. This paper presents the spiral vector method of analysis of SEIG. Spiral vector theory can be used for unified analysis of steady state and transient state in self-excited induction generator.

57    T.M. Wolbank, J.L. Machl, R. Woehrnschimmel, R. Schneiderbauer, "Low-cost inverter based detection of rotor faults in induction machines for quality management systems," Industrial Electronics Society Annual Conference, Vol.1 , pp. 324- 329 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Most fault detection systems for rotor bar defects require specific load conditions or at least sufficient moments of inertia to establish a minimum load by repetitive acceleration or deceleration. The application of a method able to detect a rotor defect at no load condition is thus advantageous especially for quality management systems in the manufacturing process where a high number of machines have to be tested with minimum consumption of electrical power an without coupling the machines using a test rig or additional moment of inertia. The method proposed in this paper is based on a modulation of the machines rotor flux magnitude in different directions of the rotor and a determination of the magnetizing/demagnetizing time constant It thus does not depend on any kind of load. For high power machines this offers the additional benefit of a reduced inverter power rating in the quality management line as only the magnetizing current of the machine has to be supplied. Moreover the method may be applied in safety critical applications for maintenance purposes, even in line-fed drives. Simulations as well as measurement results will be presented to show the applicability of the method.

58    J. Zhang, M.F. Rahman, L. Tang, "A direct flux controlled induction generator with space vector modulation for integrated starter alternator," Industrial Electronics Society Annual Conference, Vol.1 , pp. 330- 334 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel direct flux controlled scheme of induction generator has been proposed in this paper for future 42 V automobiles application. Fixed switching frequency and low torque ripple are obtained with space vector modulation. By controlling the stator flux linkage vector properly, the required DC bus voltage can be produced as well as the torque of induction machine. Simulation results show the feasibility of this scheme for the integrated starter alternator.

59    Suk-Kyum Kim, Dong-Seok Hyun, Myoung-Ho Shin, "A study on the speed estimation methods of induction motor drives in the field weakening region," Industrial Electronics Society Annual Conference, Vol.1 , pp. 335- 340 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: It is important to estimate the exact rotor speed for field weakening operation in the speed sensorless stator flux oriented (SFO) induction motor drive. Several methods have been reported to estimate exactly the speed in the speed sensorless system. In this paper, we apply two observer-based methods, the Luenberger observer (LO) and the Kalman filter (KF) to SFO induction motor drive in order to achieve a speed sensorless operation in field weakening region. Two control methods are reviewed and discussed. The operation characteristics of these methods in the field weakening region is compared by simulation and experiment.

60    A. Kumar, B.G. Fernandes, K. Chatterjee, "Simplified SVPWM-DTC of 3-phase induction motor using the concept of imaginary switching times," Industrial Electronics Society Annual Conference, Vol.1 , pp. 341- 346 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new space vector pulse width modulation based direct torque control technique for three-phase induction motor drive using concept of imaginary switching times. The effective time is determined using imaginary time vector there by the lengthy procedure of using reference voltage vector is eliminated. Also the sector identification and angle determination are not used. Simulation studies have been carried out for the proposed method and results are compared with basic DTC. Results show that the torque, current and flux waveforms are superior to that of conventional direct torque control technique. Though the results of the proposed method are at par to those of DTC with conventional space vector pulse width modulation, there is a significant reduction in execution time due to elimination of lookup table and simplicity in algorithm.

61    Sun Jin, Zheng Wei, Hou Zhenyi, "One novel scalar control scheme for induction machine," Industrial Electronics Society Annual Conference, Vol.1 , pp. 347- 352 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The traditional VVVF control scheme has the disadvantage of poor steady precision and the small output torque when working in the low frequency. In this paper, one novel scalar control scheme with the slip frequency compensation and the stator voltage dropping compensation was proposed, the simulation and the experiments results validate the proposed scheme has good steady precision and high output torque.

62    Rong-Jong Wai, Hsiang Tu, "Adaptive grey control for hybrid-resonant linear piezoelectric ceramic motor drive," Industrial Electronics Society Annual Conference, Vol.1 , pp. 353- 358 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This study presents an adaptive grey control (AGC) system for a linear piezoelectric ceramic motor (LPCM) driven by a newly designed hybrid resonant inverter. First, the motor configuration and driving circuit of an LPCM are introduced, and its hypothetical dynamic model is described briefly. Since the dynamic characteristics and motor parameters of the LPCM are highly nonlinear and time varying, an AGC system is therefore investigated based on the principle of computed torque control (CTC) and grey method to achieve high-precision position control under wide operation range. In this control system, a grey uncertainty predictor is utilized to estimate the lumped uncertainty on line to relax the requirement of the unknown uncertainty in the design of a computed torque position controller. In addition, the effectiveness of the proposed strategies is verified by numerical simulations and experimental results.

63    T. Miyazaki, K. Ohishi, K. Kuramochi, T. Hayano, D. Koide, H. Tokumaru, "Robust tracking control of optical disk recording system based on ZPET control and sudden disturbance observer," Industrial Electronics Society Annual Conference, Vol.1 , pp. 359- 364 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In optical recording system, the tracking servo system must follow the track of optical disk against the influence of the track eccentricity and the force disturbance. In tracking servo system, the influence of the track eccentricity becomes periodic disturbance. The influence of force disturbance is sudden disturbance. This paper proposes a new robust tracking servo system for optical disk recording system with feedforward controller and sudden disturbance observer. In order to suppress the periodic disturbance, this paper designs the feedforward control system with prediction of tracking error. For suppressing the sudden disturbance, this paper proposes the sudden disturbance observer by using the predictive tracking error. The experimental results point out that the proposed tracking servo system has a precise tracking response against both periodic disturbance and sudden disturbance.

64    Ching-Chih Tsai, Meng-Bi Cheng, Cheng-Kain Chan, "Adaptive backstepping position control for a linear DC brushless motor," Industrial Electronics Society Annual Conference, Vol.1 , pp. 365- 370 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops methodology and technique for design, analysis and PC-based implementation of an adaptive backstepping position control system for a linear DC brushless motor. A simplified model of the linear DC brushless motor is introduced. With this model, an adaptive backstepping control law with integral action is proposed to achieve position tracking control, assuming that the upper bounds of the ripple force and nonlinear friction are known. Based on the Lyapunov theorem and Barbalat Lemma, the closed-loop controlled system is proven to be asymptotically stable. Both computer simulations and experimental results demonstrate the feasibility and efficacy of the proposed scheme for position control of a linear DC brushless motor.

65    A. Kato, K. Ohnishi, "High speed and high precision linear DC solenoid servo system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 371- 376 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Linear motor system is used widely for manufacturing automation systems, which provide precision and high speed motion. One type of linear motor systems is Linear DC solenoid motor (LDSM) that is used in this paper. Though LDSM is able to provide instance response, LDSM has not been used widely for servo system due to nonlinear characteristic on real implementation and its stroke too short. However, LDSM used in this paper has better thrust constant compared with general LDSM. Here, the servo system based on LDSM is developed. Firstly, LDSM is employed for position control within disturbance observer. Later, a force control is developed as well. Experimental results shown that LDSM's performance has attained high speed and high precision on both control schemes.

66    T. Mashimo, K. Ohishi, H. Dohmeki, "High speed positioning system considering unknown coulomb friction and inertia variation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 377- 382 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In a conventional positioning system, when the position error becomes small, the motor cannot obtain enough deceleration torque. Hence, the position response becomes slow. There is also an other positioning system that is to design a position reference from trapezoidal speed reference. This positioning system is valid when load torque and the final goal position are given. However, if the load torque and the final goal vary, its position response cannot have the desired response. In order to overcome these problems, this paper proposes a new high speed positioning system of AC servo motor considering both coulomb friction and inertia variation. The proposed always uses the maximum acceleration or deceleration torque and the maximum speed.

67    Sang-Hyuk Lee, Sungshin Kim, Jang Mok Kim, Man Hyung Lee, "Fourier and wavelet transformations for the fault detection of induction motor with stator current," Industrial Electronics Society Annual Conference, Vol.1 , pp. 383- 388 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this literature, fault detection of an induction motor is carried out using the information of stator current. After preprocessing actual data, Fourier and wavelet transforms are applied to detect characteristics under the healthy and various faulted conditions. The most reliable phase current among 3-phase currents is selected by the fuzzy entropy. Data are trained with a neural network system, and the fault detection algorithm is carried out under the unknown data. The results of the proposed approach based on Fourier and wavelet transformations show that the faults are properly classified into six categories.

68    Tai-Yu Wang, Ching-Chih Tsai, "Adaptive trajectory tracking control of a wheeled mobile robot via Lyapunov techniques," Industrial Electronics Society Annual Conference, Vol.1 , pp. 389- 394 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops the control methodologies under the specific assumption of the data source environments, for trajectory tracking of a wheeled mobile robot (WMR) with vision data. To solve the problem of trajectory tracking control of WMR, one novel kinematics control law is presented to steer the vehicle to asymptotically follow the desired trajectories. To compensate for dynamic effects associated with the dynamic models, an adaptive nonlinear trajectory tracking control law is presented to ensure asymptotic trajectory tracking for the vehicle. The experimental system is composed of a wireless RS232 modem, a digital signal processor (DSP), a wheeled mobile robot, and a vision system with a host computer. A computation-effective and high-performance controller using the digital signal processor is constructed for executing the developed sophisticated trajectory tracking laws. Simulation and experimental results are included to illustrate the feasibility and effectiveness of the proposed control method.

69    G. Yasuda, Bin Ge, "Color based object recognition, localization, and movement control for multiple wheeled mobile robots," Industrial Electronics Society Annual Conference, Vol.1 , pp. 395- 400 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an experimental study on object recognition, localization and movement control of soccer robots using a vision system. A color image segmentation method based on YUV color information of each pixel of the color image is applied to the recognition of position and orientation of a small mobile robot. First the lower and higher threshold values of Y, U, and V are determined for the sample color markers. Then color image segmentation is performed using the tables that transform each value of Y, U, and V in a pixel to membership data in several color classes. The position and orientation of the robots and ball on the field are efficiently and accurately recognized by calculating the center of gravity of each extracted color region. Experimental results of real-time movement control and ball handling are also presented.

70    Yong-Shik Kim, Keum-Shik Hong, "A tracking algorithm for autonomous navigation of AGVs in a container terminal," Industrial Electronics Society Annual Conference, Vol.1 , pp. 401- 406 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a tracking algorithm for the autonomous navigation of the automated guided vehicles (AGVs) operated in a container terminal is investigated. The navigation system is based on sensors that detect range and bearing. The navigation algorithm used is an interacting multiple model algorithm to detect other AGVs and avoid obstacles using information obtained from the multiple sensors. In order to detect other AGVs (or obstacles), two kinematic models are derived: A constant velocity model for linear motion and a constant-speed turn model for curvilinear motion. For the constant-speed turn model, an unscented Kalman filter is used because of the drawbacks of the extended Kalman filter in nonlinear systems. The suggested algorithm reduces the root mean squares error for linear motions and rapidly detects possible turning motions.

71    Thien Phuc Iran, Tan Lam Chung, Hak Kyeong Kim, Sang Bong Kim, Myung Suk Oh, "Trajectory tracking of mobile manipulator for welding task using sliding mode control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 407- 412 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposed a sliding mode control method for a two-wheel welding mobile manipulator to track a smooth 3D curved welding path. To design a tracking controller, the tracking errors are defined between the welding point of the torch and the reference point moving at a specified constant welding speed on the welding path. A sliding surface is set up and a control law is proposed for stabilization of the sliding surface. The simulations are performed to show the effectiveness of the proposed controller.

72    Seul Jung, Eun Soo Jang, "Collision avoidance and control of a mobile robot using a hybrid force control algorithm," Industrial Electronics Society Annual Conference, Vol.1 , pp. 413- 418 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new collision avoidance algorithm based on a potential force field controlled by a hybrid force control algorithm for a mobile robot is proposed. To avoid obstacles on the path of a mobile robot, a potential force field is assumed to be present and regulated by the force control algorithm. The force control algorithm used here is the simple PD type hybrid force control that minimizes the force error directly. A potential force field (PFF) is assumed to be a certain distance measured by a laser finder distance sensor. This PFF is regulated by the control algorithm based on a mobile robot dynamics. Simulation studies are conducted to confirm the proposed collision avoidance tracking control algorithm.

73    Ji Hong Li, Pan Mook Lee, Bong Huan Jun, "Application of a robust adaptive controller to autonomous diving control of an AUV," Industrial Electronics Society Annual Conference, Vol.1 , pp. 419- 424 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a robust adaptive controller for autonomous diving control of an autonomous underwater vehicle (AUV). It is well known that the dynamics of underwater robotics vehicles (URVs) are highly nonlinear and the hydrodynamic coefficients of vehicles are difficult to be accurately determined a priori. In this paper, the smooth unknown dynamics of vehicle is approximated by neural network, and the remaining unstructured uncertainties, such as disturbances and unmodeled dynamics, are assumed to satisfy certain growth conditions characterized by 'bounding function' composed of known function multiplied by unknown constant. Under a certain relaxed assumptions on the control gain function, the proposed control scheme can guarantee that all the signals in the closed-loop system satisfy to be uniformly ultimately bounded (UUB). Simulation studies using ASUM AUV model, which is developing at KRISO, are included to illustrate the effectiveness of the proposed control scheme. Some practical features of the control laws are also discussed.

74    Yu Wei-bo, Zhao Ding-xuan, Chen Nimg, "Study on fuzzy gearshift tactics in automatic gearshift control system of technical vehicles," Industrial Electronics Society Annual Conference, Vol.1 , pp. 425- 429 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper according to the energy-saving gearshift law of the hydraulic mechanical transmission, adopting fuzzy control technology, establish the self-correction fuzzy gearshift tactics. This fuzzy gearshift tactics is consisting of the basic fuzzy gearshift tactics and fuzzy correction module. The test results showed that the energy-saving gearshift law tally with the request of the vehicle gearshift. The self-correction fuzzy gearshift tactics can decrease the gear times, enhance the economy of the fuel and the efficiency, and improve the gear quality.

75    M.Y. Shieh, Y.H. Chan, C.P. Cheng, J.C. Hsieh, "Two-stage fuzzy navigation control of a vision-based intelligent shopping service robot," Industrial Electronics Society Annual Conference, Vol.1 , pp. 430- 435 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper describes a two-stage fuzzy navigation controller for a vision-based intelligent shopping service robot (ISSR). The navigation strategy of the robot merges two distinct situations. The global navigation strategy concludes the traveling path from the information such as the task styles assigned to the ISSR and the people distribution in the supermarket. The local navigation control consists of two stages. The obstacle avoidance stage is based on visual feedback and sonar sensory information to detect obstacles, in which, an integrated fuzzy controller is designed to offer a smoother navigation. The guiding control stage provides objective guidance to avoid that the robot travels adrift in the supermarket. The simulation results show the feasibility of the proposed navigation control system.

76    S. Oh, N. Hata, Y. Hori, "Proposal of human-friendly motion control: control design for power assistance tools and its application to wheelchair," Industrial Electronics Society Annual Conference, Vol.1 , pp. 436- 441 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we expand the human-friendly control concept, which has been restricted only to the robot controls into general assistive controls. For a demonstration of this generalized human-friendly control, we adopt a power-assisted wheelchair and apply a novel control to it. We investigate some requirements for this generalized human-friendly control and suggest solutions to it. Our solution approach consists of two parts: one is on the observation problem; the other is on the control problem. We pick up two problems, which happen in power-assisted wheelchair control by gravity. The first is the tendency of falling backward that is related to the observation problem, and the other is the difficulty in propulsion on a hill that is related to the control problem. We propose solutions to each problem, generalize them, and try to establish the human-friendly control.

77    H. Wilmar, M. Augusto, A. Antonio, "H/sub /spl infin//control of a step-down DC-DC switching regulator for 14/42 V hybrid architectures of next-generation cars," Industrial Electronics Society Annual Conference, Vol.1 , pp. 442- 447 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In the present paper the well-known step-down DC-DC switching regulator based on PWM techniques is used to supply 14 V to the electrical and electronic systems of next-generation cars, which not only will have to perform under 42 V technology, but also with many automotive electrical and electronic systems which have been designed to work under the soon-to-be obsolete 14 V technology. Here, the classical design of PWM DC-DC converters is compared to the post-modern one, which is implemented in this paper by using analog electronics. Furthermore, QFD techniques are used as tools to better focus on both their applications to the automotive industry and the cost of their implementations. The experimental results demonstrate the importance of using robust and optimal control techniques when designing the 14/42 V converters for the next-generation cars.

78    Jung-Min Lee, Dong Hwal Lee, HeeTae An, Nam Huh, Myoung Kook Kim, Man Hyung Lee, "Ultrasonic satellite system for the positioning of mobile robots," Industrial Electronics Society Annual Conference, Vol.1 , pp. 448- 453 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The positioning problem of mobile robot is an important part of control problem for mobile robot. Dead Reckoning is widely used for positioning of mobile robot. However this method has problems because it accumulates estimation errors. In this paper, we propose a new method to increase the accuracy of estimated position using the U-SAT (Ultrasonic Satellite system). U-SAT is composed of a distance measurement using ultrasonic wave and the position acquisition in the world coordinate using the GPS. It is shown that we will be able to estimate the position of mobile robot precisely, in which errors are not accumulated. The experimental results show that the proposed method is enable to estimate the position of the mobile robot.

79    R. Rajugan, E. Chang, L. Feng, T.S. Dillon, "XML views. Part II. Modeling conceptual views using XSemantic nets," Industrial Electronics Society Annual Conference, Vol.1 , pp. 454- 462 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For complex industrial informatics applications, there exists a requirement to model and design views at a higher level of abstraction. Since the classical view definitions are only available at the data, query or instance level, modelling and maintaining views for such complex systems is an impossible task. With the introduction of XML and XML Schema and their rapid adaptation by the commercial and industrial systems increased the complexity further for view design and specification. In this paper we present a methodology for modelling and transforming conceptual views into XML views using a modified semantic network called XML Semantic Net (XSemantic Net). Here we extend the work with a rich set of conceptual operators to enable systematic construction of conceptual views. First the semantic modelling of conceptual view is enabled by using XSemantic nets and its conceptual operators. Then we enable systematic mapping of conceptual views into XML views (logical level) by providing a set of transformation rules between XSemantic nets and XML (view) Schema.

80    M.A. Khan, V. Potdar, E. Chang, "An architecture platform for grey level modification steganography system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 463- 471 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The secret information exchange method is an alternative approach for information protection using 3/sup rd/ party trustees such as CIA. This approach provides corporations, governments and industry systems with winning edge, sustainable competitive advantage and assist in overcoming vulnerability of a cyber attack. The proposed grey level modification steganography is an approach where words are mapped to image pixels. The pixels and pixel values are selected from an image using a mathematical algorithm. In this paper, we present an architecture platform for a new grey level modification steganography algorithm, a secret hiding technique and a prototype system. We have implemented the whole platform. We validate the secrecy of the technique and explain the results, finally we will outline the capacity of the platform and its capability of information embedding and hiding.

81    G. Skinner, E. Chang, M. McMahon, J. Aisbett, M. Miller, "Shield privacy Hippocratic security method for virtual community," Industrial Electronics Society Annual Conference, Vol.1 , pp. 472- 479 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Pearlman et al., (2002) defines a virtual community as a large, multiinstitutional group of individuals who use a set of rules, a policy, to specify how to share their resources. With such a large collection of data stores in these resources, each of which could be data mined to different degrees, the privacy of each of the individuals needs to be protected. Within a virtual community, especially one also used to facilitate knowledge discovery, there are a number of privacy issues that must be addressed and resolved in ways other than through privacy laws and policies alone. This is due to the fact that, as to date, these laws have proved mainly ineffective and there is an ever growing concern by individuals about their privacy. Web surveys Srikant R. (2002) have identified that 82% of users have said improved privacy policies and methods would matter in Web environments. Agarwal R. (2002) highlights the fact that a secure collaborative environment, such as a virtual community, needs to provide authentication, authorization, privacy and data integrity. In this paper, we identify the technology issues, followed by the presentation of our proposed solution. We provide a conceptual framework of the Hippocratic security method to provide information security for shield privacy in virtual communities and we describe the architecture and design of the proposed solution. We outline the implementation, testing and evaluation strategies of our solutions. The proposed solution shall monitor the use of personal information as it is passed around the virtual community and protected information paths, data at rest, database and information resources through the use of the Hippocratic database principle to enforce Hippocratic security policies and procedures together with privacy preserving data mining Evfimievski et al., (2003) method for excellent information security in a virtual community environment.

82    M. Hadzic, E. Chang, P. Wongthongtham, R. Meersman, "Disease ontology based grid middleware for human disease research study," Industrial Electronics Society Annual Conference, Vol.1 , pp. 480- 486 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes disease ontology based grid middleware which acts like an intelligent search engine, receiving requests from customers and finding services or service providers for them. We note that currently no such work has been done or successfully implemented. We propose the use of grid middleware for information exchange as it is able to access unstructured petabyte information on the Web and pull the right information for the user. Before it can do this, it obtained the knowledge from ontologies such as medical issues, health matters, disease factors, DNA etc and knows who is doing a particular research, what work has been done and which research group have the most up-to-date results, which database in the Web is needed, what is in it, what is the value of the information in that database, where it fits into the specific disease knowledge and how to access it, whose work relates to each others, overlapping with or complements each others etc. It helps search, translate, categorize, index (through ontology and agents), download and upload the exact disease information that the end-user requires.

83    A. Chiou, X. Yu, "Integrated expert advisory system for control and management of parthenium weed infestation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 487- 492 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper discusses the problem of parthenium weed infestation in Queensland, Australia and describes P-Expert, an expert advisory system designed to provide expert knowledge in control and management strategies of parthenium weed. P-Expert is fundamentally a hybrid fuzzy expert system incorporating technologies from fuzzy logic, relational database and multimedia systems. The primary topic of this paper will be a description of the framework of P-Expert and its overall infrastructure, focusing on five main areas: (1) layered component architecture, (2) discourse semantics (explanatory capabilities), (3) meta-consequent fuzzy functions, (4) fuzzy forecasting of weed infestation, and (5) deployment of large scale expert advisory system.

84    O.K. Hussain, B. Soh, "Maintaining the integrity of XML signatures by using the manifest element," Industrial Electronics Society Annual Conference, Vol.1 , pp. 493- 495 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: One of the aims of providing 'security of data' in e-commerce transactions is making sure that the receiver receives the same data which the sender sends, that is the data has not been tampered in any way. To achieve this aim digital signatures are used. A digital signature helps in providing integrity, message authentication, and signer authentication for the signed data. An XML signature can contain or point to the data that is being signed. In this paper we discuss a possible solution of avoiding a signature from breaking when there is a change in the location of the document after it has been signed.

85    Liang-Rui Chen, Roy Chaoming Hsu, Chuan-Sheng Liu, Hsin-Ying Yang, Neng-Yi Chu, "A grey-predicted Li-ion battery charge system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 502- 507 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a Li-ion battery is considered as a grey system and a predictable Li-ion battery charge system is implemented using the grey prediction theory. The proposed grey-predicted Li-ion battery charge system (GP-LBCS) can decrease charge time and avoid overcharge to increase life cycle. To assess the system performance, a prototype of the GP-LBCS is implemented. Experiments shown that the GM(1,1) model can precisely predict the Li-ion battery voltage, and the charge speed is increased about 16% such that the safe charge condition is held. These experimental results are very attractive as theory predicts.

86    M.M. Jalla, A. Emadi, G.A. Williamson, B. Fahimi, "Modeling of multiconverter more electric ship power systems using the generalized state space averaging method," Industrial Electronics Society Annual Conference, Vol.1 , pp. 508- 513 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Based on the more electric ship (MES) concept, conventional mechanical, hydraulic, and pneumatic power transfer systems are replaced by electrical systems in different sea vehicles. Considering different levels of power requirements of various electrical loads and for the achievement of compact, light, safe, and efficient power supplies, implementation of multiconverter power electronics based power systems is the most feasible option in the development of advanced navy vehicles. This paper presents a modular approach for the modeling and simulation of multiconverter MES power systems based on the generalized state space averaging method. MES power systems may consist of many individual converters connected together to form large and complex systems. In addition to simplifying the analysis procedure, by using the proposed method, time step for analysis of the system can be increased. Therefore, required computation time and computer memory for complex systems can be reduced considerably. In this paper, after introducing the proposed approach, results of applying the method to a representative system are presented. Experimental results are also provided to verify the proposed technique.

87    G. Franceschini, E. Lorenzani, M. Cavatorta, A. Bellini, "3boost a high power three-phase step-up full-bridge converter for automotive applications," Industrial Electronics Society Annual Conference, Vol.1 , pp. 514- 519 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a simple and original DC/DC step-up converter topology for switch-mode DC power supplies. The proposed architecture is well suited for high power applications with battery supply. A prototype was realized and tested for the power supply of automotive devices. In this environment signals are characterized by high dynamic variations, thus they can be operated only relying on power supplies with high dynamic capabilities. The latter constraint can be achieved only using closed-loop switch-mode DC/DC converters at high switching frequency. So doing converter efficiency is reduced, and EMC problems arise. In summary power supply efficiency and supply voltage quality are key features of the converter design. In this paper the above mentioned issued were tackled relying on an open loop topology. The original solution is the adoption of a three-phase transformer with delta-wye connection within a full-bridge converter topology. The proposed architecture will be referred to as 3boost power supply. The three-phase transformer replaces the common single-phase transformer and it is supplied at primary by three square waves, produced by a three-phase full bridge inverter. At secondary a three-phase full wave diode rectifier is used to obtain the output DC voltage level. Experimental results confirm that this topology, with respect to a single-phase push-pull converter, allows to achieve higher efficiency, a lower ripple factor, and a unitary transformer utilization factor. The proposed architecture is patent pending.

88    Liu Yancun, Lu Tiecheng, Fu Chuang, "Automatic arc suppression equipment with fast response based on TSC control technology," Industrial Electronics Society Annual Conference, Vol.1 , pp. 520- 523 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a kind of automatic arc suppression equipment with fast response based on thyristor switched capacitor (TSC) control technology. It can mitigate the bad effects caused by single-phase-to-ground-faults in the distribution system. Three functions were realized in order to ensure the equipment's safe and reliable operation: first, intelligent distinguishing a single-phase-to-ground-fault; second, accurate measure of the capacitive reactance of the system-to-ground; third, safe running of thyristors. The control system's hardware composed of PLC, HMI of touch screen and across-zero trigger boards is also proposed. The simulation tests prove the equipment has acceptable performance.

89    D. Mahinda Vilathgamuwa, Xie Yue, K.J. Tseng, "Development and control of a 3-axis motion simulator for satellite ADCS hardware-in-the-loop simulation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 524- 529 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the development and control of a 3-axis motion simulator are described. The simulator is used to test and calibrate satellite attitude determination and control system (ADCS) by means of hardware-in-the-loop simulation (HILS) technique. The motion simulator actuators are permanent magnet synchronous motor (PMSM) drives. A mathematical model of the simulator is derived and an adaptive nonlinear tracking control law is developed based on Lyapunov stability theory. Furthermore, by analyzing HILS dynamics and using simplified modeling technique, the basic dynamics requirement of the simulator is derived. The simulation and experimental results are presented to verify the successful design of the simulator and efficacy of the proposed control system.

90    R.P. Singh, A.M. Khambadkone, G.S. Samudra, Y.C. Liang, "Optimal power converter topology for powering future microprocessor demands," Industrial Electronics Society Annual Conference, Vol.1 , pp. 530- 535 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Higher computation speeds demand higher clock frequencies, which means increased power loss. To decrease the power loss, it becomes necessary to reduce the operating voltage. Hence the future microprocessors will operate at significantly lower voltages and demand much higher currents than the present generation microprocessors. They require voltage regulating modules (VRM) to provide the desired regulated power supply. In addition, due to increased clock frequencies and higher currents, these microprocessors will present high slew rates during transient. To meet these demands, we need to have high power density, heavier load and tight voltage regulating modules having high efficiency over a wide range of load and having good transient response. In this paper, we present the requirements for the VRMs for future microprocessors and discuss the limitations of the existing topologies.

91    Honghao Zhong, Pingping Chen, Zhengyu Lu, Zhaoming Qian, Hao Ma, "Three-phase four-wire series hybrid active power filter with fundamental current bypass channel," Industrial Electronics Society Annual Conference, Vol.1 , pp. 536- 539 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel control scheme based on per-phase dq transformation for three-phase four-wire series hybrid active power filter with passive fundamental current bypass channel is proposed. The series active power filter presents a resistor to the grid harmonic current, by which, the load harmonic current will be obliged to flow into the passive power filters. At the same time, the voltage source inverter presents a resistor to the fundamental component of the inverter current and the grid fundamental current will be obliged to pass through the passive channel. So the inverter delivers the harmonic power only and the required rating of the active filter can be much smaller than that of conventional one. A 5 kW prototype is implemented digitally by TMS320F2407A(DSP). The experimental results validate the proposal control scheme.

92    Jong-Kun Lee, Jul-Ki Seok, Dong-Choon Lee, "Unified active power filters for source voltage unbalance/current harmonics compensation and power factor correction," Industrial Electronics Society Annual Conference, Vol.1 , pp. 540- 545 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a unified control scheme for series-type active power filter combined with shunt passive filter to compensate the source voltage unbalance/current harmonics and to correct the power factor simultaneously. The phase angle and the reference voltage for unbalanced voltage/current harmonics compensation are derived from the positive voltage sequence component out of the unbalanced source voltage by using digital all-pass filters. The power factor compensation is achieved by controlling the amplitude of reactive power current in a series filter as zero in synchronously rotating reference frame. Finally, the unified controller output voltage is composed of source voltage unbalance/current harmonics compensation term and power factor correction term. Thus, the proposed algorithm successfully compensates the source voltage unbalance/current harmonics and the power factor. The validity of the proposed scheme has been verified for actual 3 kVA hybrid active power filter system.

93    A. Cavini, C. Rossi, A. Tilli, "Shunt active filters controller with new saturation strategy," Industrial Electronics Society Annual Conference, Vol.1 , pp. 546- 551 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The effects of current limitation and control voltage saturation in shunt active filters (SAF) are discussed in the paper. Starting from the solution proposed, a novel strategy is proposed to guarantee limitation of the DC-link voltage and good current control even when saturations occur. In particular, the case of oversized loads inducing saturations in SAF current and control voltage is considered. Properties of the digital current control performed in /spl alpha//spl beta/ reference are exploited in the saturation strategy design. The effectiveness of the proposed technique is investigated by simulations.

94    H.-P. To, F. Rahman, C. Grantham, "Sliding mode control of current-source active power filter with control delay compensation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 552- 557 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the use of sliding mode control with a current-source active power filter. From the analysis of the system model, a suitable sliding control function is proposed and its implementation on a DSP-based controller is discussed. A new switching control strategy for the active filter converter with sliding mode control is also proposed. In addition, the effect of control delay on the system response is discussed and a simple measure to compensate this delay is presented. Simulation results show the validity the proposed approach.

95    Zhou Lin, Zhou Xiaojun, Zhou Luowei, T. Heng-Ming, "One-cycle control for three-phase four-leg active power filter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 558- 563 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a three-phase four-leg active power filter design based on one-cycle control. We extend the constant-frequency integration control method to three-phase four-wire systems. The control circuit is composed of four integrators with reset along with several flip-flops, comparators and some linear components. The proposed APF does not require load current and phase voltage sensing, nor the harmonics and reactive current calculation, and does not use any multipliers. Moreover, it employs constant switching frequency modulation, which is desirable for industrial applications. Simulation results demonstrate that the proposed active power filter is capable of compensating current harmonics and reactive power, and reducing the neutral current in an effective and robust manner.

96    Zhou Lin, Shen Xiaoli, Zhou Luowei, Lei Peng, "Active power filter based on i/sub p/-i/sub q/ detecting method and one-cycle control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 564- 569 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: As one-cycle controlled active power filter (APF) only can compensate harmonics and reactive currents simultaneously, this paper presents a scheme which uses i/sub p/-i/sub q/ method as harmonic currents detecting circuit of APF and one-cycle control instead of PWM control as currents tracing control circuit. Then, simulation of harmonics compensation is performed and compared with both APF based on triangular wave modulation and one-cycle controlled APF. The simulation results verify that this scheme not only makes structure of control circuit simple, gains high control accuracy and fast response, but compensates harmonics effectively and makes APF multifunctional as well.

97    Rong-Jong Wai, Li-Wei Liu, "High-efficiency voltage-clamped DC-DC converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 570- 575 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This study investigates a newly designed DC-DC converter with reduced reverse-recovery current and switch voltage stress. A high-efficiency clamped-voltage DC-DC converter is designed by way of the combination of inductor and transformer to increase the voltage gain. Moreover, one additional inductor provides the reverse current path of the transformer to enhance the utility rate of magnetic core. In addition, the voltage-clamped technology is used to reduce the switch voltage stress so that it can select the Schottky diode in the output terminal for alleviating the reverse-recovery current and decreasing the switching and conduction losses. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Thus, the proposed converter topology has favorable voltage-clamped effect and superior conversion efficiency. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source with 250 watts nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy.

98    Yueh-Ru Yang, "An adjustable linear power supply with a phase-shift PWM tracking pre-regulator," Industrial Electronics Society Annual Conference, Vol.1 , pp. 576- 580 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An adjustable linear DC power supply using a switching-type tracking pre-regulator is described in this paper. To improve circuit efficiency, a full-bridge phase-shift pulse-width-modulation (FBPS-PWM) converter is employed to pre-regulate the input voltage of the adjustable power supply. In the proposed circuit scheme, there are two control loops. One is the linear regulator loop and the other is the FBPS-PWM converter loop. While the linear regulator loop regulates the output, the converter loop tracks the voltage variation. The output voltage of the tracking FBPS PWM converter is always greater than the output voltage of the adjustable linear regulator 2.5 volts. To verify the proposed scheme, a one-kilowatt 0/spl sim/60 volts/20 amperes prototype circuit is built. Simulation and experimental results show that the proposed hybrid scheme can obtain the merits of high efficiency and low output ripple.

99    H. Koizumi, K. Kurokawa, "Analysis of class E inverter with switch-voltage elimination," Industrial Electronics Society Annual Conference, Vol.1 , pp. 581- 585 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an analytical description of a Class E inverter with switch-voltage elimination. Using 16-digit-binary-driving patterns, switch-voltage pulses are eliminated from 1 to 15 in a series of 16 cycles. In each pattern of 2/sup 16/ variations, the voltage and the current waveforms are numerically computed with Runge-Kutta formula. The waveforms are well agreed with observed waveforms of circuit experiments in both time domain and frequency domain. Based on the waveform data, their input power, output power, DC-equivalent resistance, harmonics, and low-frequency components are calculated and shown as functions of the output power. The analytical results show that, the output power can be controlled, without changing the operating frequency nor duty ratio, by eliminating the switch-voltage pulses. To gain a desired output power, one can choose an appropriate switching pattern based on the analytical results.

100    N. Keskar, G.A. Rincon-Mora, "Self-stabilizing, integrated, hysteretic boost DC-DC converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 586- 591 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In portable, battery-powered applications, integration of switching DC-DC converters is crucial to reap maximum benefits in size, cost, and design ease. The frequency compensation circuit, whose design varies with off-chip, passive filter (L-C) components, forms a critical hurdle to obtaining a fully integrated solution. Surveying state-of-the-art control techniques in literature, hysteretic control in buck converters, which in a single loop, controls inductor current ripple indirectly while regulating the output voltage, is observed to be the simplest, fastest, and needing no compensation circuit, thus being best suitable for integration. However, the technique is not readily applied to boost converters. This paper proposes a novel technique to harness voltage-mode hysteretic control in boost converters by controlling inductor current and output voltage through separate loops. The proposed circuit designed for V/sub IN/=1.2 V (nom), V/sub out/=3.3 V /spl plusmn/5%, I/sub out/=0.1 to 1 A shows excellent voltage regulation and transient response (/spl plusmn/150 mV), without the use of any compensation circuit.

101    Hao Ma, Siliang Han, "Buck inverter with sliding mode control strategy," Industrial Electronics Society Annual Conference, Vol.1 , pp. 592- 597 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new DC/AC switched mode power amplifier based on sliding mode control (SMC) is presented in this paper. The inverter is composed of two independent current bi-directional buck converters with sliding mode control, and achieves high-performance AC signal power amplification. The inverter topology is analyzed by small signal modeling with different operating conditions. And the existence and stability of the sliding mode controller is particularly discussed. The design of SMC parameters is also analyzed for stability, robustness and dynamic response. The SMC inverter is robust with respect to both external disturbances and variations on the load and input voltage. And the power amplifier can realize accurately tracking and amplification for AC signals with frequency range up to 1000 Hz. Experimental results from a 1 kW prototype are included to verify the conclusion in the paper.

102    Kap-Ho Seo, Changmok Oh, Ju-Jang Lee, "User pose estimation using sensor distribution bed," Industrial Electronics Society Annual Conference, Vol.1 , pp. 598- 602 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, an intelligent bed robot system (IBRS) is proposed, that is a special bed equipped with robot manipulator. To assist a patient using IBRS, pose and motion estimation process is fundamental. It is designed to help the elderly and the disabled for their independent life in bed without other assistants.

103    N.-M. Kwok, Sam Kwong, "Path planning for mobile robot localisation and mapping," Industrial Electronics Society Annual Conference, Vol.1 , pp. 603- 608 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The path followed by a mobile robot plays an important role in the quality of localisation and mapping. The localisation and mapping problem can be put into an estimation framework. The estimator should be supplied with a sufficient amount of information and to extract the information in an efficient way. These requirements depend on the relative geometry between the robot and landmarks in the workspace. Therefore, a path to be followed by the robot is required to be planned. The evolutionary search with multiobjective Pareto optimisation approach is adopted here to obtain a near-optimal one-step-ahead robot pose in order to improve the localisation and mapping quality. Simulation results are included to demonstrate the effectiveness of the proposed approach.

104    Su Yong Kim, Dong Hwal Lee, Hee Tae An, Sang Hun Lee, Young Ho Koh, Man Hyung Lee, "Analysis of UPS (ultrasonic positioning system) using DGPS," Industrial Electronics Society Annual Conference, Vol.1 , pp. 609- 613 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the position of a mobile robot using DGPS (differential GPS) and UPS (ultrasonic positioning system) is measured and the performance of UPS is analyzed using DGPS. UPS is absolute positioning system using ultrasonic waves and has better performance in low price than the other absolute positioning systems. So in order to evaluate the performance, UPS is compared with the RTK (real-time kinematics) method, which is of the most accurate methods in the DGPS. As a result, the possibility of using UPS can be discussed as pseudolites or pseudosatellites in the place where GPS is not available.

105    A. Albagul, Wahyudi, "Dynamic modeling and adaptive traction control for mobile robots," Industrial Electronics Society Annual Conference, Vol.1 , pp. 614- 620 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Mobile robots have received a great deal of research in recent years. A significant amount of research has been published in many aspects related to mobile robots. Most of the research is devoted to design and develop some control techniques for robot motion and path planning. A large number of researchers have used kinematic models to develop motion control strategy for mobile robots. Their argument and assumption that these models are valid if the robot has low speed, low acceleration and light load. However, dynamic modeling of mobile robots is very important as they are designed to travel at higher speed and perform heavy duty work. This paper presents and discusses a new approach to develop a dynamic model and control strategy for wheeled mobile robot which I modeled as a rigid body that roles on two wheels and a castor. The motion control strategy consists of two levels. The first level is dealing with the dynamic of the system and denoted as 'low' level controller. The second level is developed to take care of path planning and trajectory generation.

106    O. Ayhan, K. Erbatur, "Biped robot walk control via gravity compensation techniques," Industrial Electronics Society Annual Conference, Vol.1 , pp. 621- 626 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Past three decades witnessed a growing interest in biped walking robots because of their advantageous use in the human environment. However, their control is challenging because of their many DOFs and nonlinearities in their dynamics. Various trajectory generation and walking control approaches ranging from open loop walking to systems with many sensors and feedback loops have been reported in the literature. The tuning of the parameters of reference gait is a common complication encountered. Another important problem of the walking control is the ground force interaction of the swinging leg at landing. This paper uses position references for the upper body. Optimization techniques are employed to obtain suitable leg joint torques for the supporting leg to track body reference trajectories. Locomotion is achieved by a swinging leg control scheme which is independent of the body reference position tracking. This method is based on gravity compensation and virtual potential fields applied to the swinging leg. Soft landing of the leg can easily be handled with this scheme. 3D dynamics and ground interaction simulation techniques are employed for a 12-DOF biped robot to test the proposed method. The simulations indicate the applicability of the method in real implementations.

107    S. Uchikado, S. Lili, M. Nagayoshi, "New visual feedback control design about guidance of a mobile robot using vanishing point," Industrial Electronics Society Annual Conference, Vol.1 , pp. 627- 632 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We consider a problem about navigation of a mobile robot with a camera in indoor environment. A new visual control method using a vanishing point of parallel lines at both sides of the corridor is introduced, and we call this the vanishing point visual control method. This method gives a lot of useful information on the design. Therefore we can't need a priori information except both widths of the corridor and the robot, but we can easily design the visual feedback system for guidance and obstacle avoidance by using this method. The idea is based on perspective geometry such as perspective projection, epipolar geometry, vanishing point, and projective transformation.

108    Chang-Hyun Park, Kwee-Bo Sim, Fumio Harashima, "Human adaptive system model development merged with context and emotion information," Industrial Electronics Society Annual Conference, Vol.1 , pp. 633- 636 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, the research of processing sensor information has been performed actively. At this time, we need a context recognition manager system that can aware near circumstances and act adaptively, though the same device is used. If a machine could recognize user's circumstances, it can reduce the failure on working and improve the user's working ability by using the recognized information. In this paper, we propose a system that is adaptive to a user. After the system perform a predefined action by using merged information with circumstance's context and user's emotion, it adapts itself to the change in its surround or user's emotional response.

109    S. Mori, H. Kim, S. Ishikawa, K. Nakamura, A. Yamamoto, "Segmentation of lung area and extraction of abnormal area on CT images of the thorax," Industrial Electronics Society Annual Conference, Vol.1 , pp. 637- 640 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In the recent years, various imaging techniques have been introduced into medical fields such as ultrasound images, magnetic resonance images, CT images, etc. In this paper, we propose a new technique for segmentation of lung area and extraction of its abnormal area on the CT image set of the thorax. In the first stage, we extract the ROI based on image preprocessing techniques. In the final stage, the abnormal area is extracted by comparing the density profile. In the experiment, nine lung CT image sets of the thorax are employed in the proposed technique and some of results are shown.

110    S. Suzuki, N. Tomomatsu, F. Harashima, K. Furuta, "Skill evaluation based on state-transition model for human adaptive mechatronics (HAM)," Industrial Electronics Society Annual Conference, Vol.1 , pp. 641- 646 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, quantification of a skill-level, which is a significant item to achieve the human adaptive mechatronics (HAM), is considered. One method to quantify the skill-level of operator's manipulation of a robot is proposed by using a discrete state-transition model. In order to obtain experimental data for evaluation of the proposed method, a data acquisition system for a human-machine system is devised. The system consists of the telemanipulation of a legged robot, the telecontrol navigator, an eye-gaze measurement system, a recording program of a mouse action and a 3D-position sensor. From analysis using the experimental data, it could be confirmed that checking of a combination of different type transition states has the possibility to quantify the operator's skill and to assist his manipulation.

111    K. Kurihara, S. Suzuki, F. Harashima, K. Furuta, "Human adaptive mechatronics (HAM) for haptic system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 647- 652 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Based on a new concept of a human-in-the-loop system called human adaptive mechatronics (HAM), a system structure and its design method are shown for a haptic system. HAM is a novel intelligent machine exerting high performance by enhancing human skill and by making machine functions adapt to skill level. In this report, we deal with a point-to-point task by human manipulation. An estimation method of a human controller is proposed under an assumption such that a human controller consists of a PD and a delay-time element. An assist control that adjusts support ratio from a machine side according to the human skill is proposed. From results of experiments to beginners, it was confirmed that parameters of the operator's controller could be estimated sufficient and the human performance of manipulation was enhanced by the assistant method using estimated parameters.

112    H. Kobayashi, Y. Ohyama, J.-H. She, M. Hosaka, H. Hashimoto, "Transfer function representation of situated human's controller," Industrial Electronics Society Annual Conference, Vol.1 , pp. 653- 656 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals with an analysis of situated human's behaviour as a controller that stabilizes unstable plants. There are studies that deal with human's dynamics in a certain ideal environment, but few detailed analysis of human who acts freely is discussed yet. Authors employ the inverted pendulum game to clarify the problem.

113    Youngim Jung, Donghun Lee, Aesun Yoon, Hyuk-Chul Kwon, "Transliteration system for Arabic-Numeral Expressions using decision tree for intelligent Korean TTS," Industrial Electronics Society Annual Conference, Vol.1 , pp. 657- 662 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Though there has been much work on TTS technologies and several TTS systems have customized for Korean, current TTS systems output many errors in transliterating non-alphabetic symbols such as Arabic numerals and text symbols. Arabic Numeral Expressions (ANEs) show a high occurrence-frequency and deliver significant senses, especially in scientific or informative documents and texts. This paper proposes TAN (Transliteration system for Arabic-Numeral expressions) which can efficiently disambiguate the meaning and reading of Arabic Numeral Expressions in texts by using a decision tree. For the purpose of analyzing and learning data, three phases of learning elements were suggested: patterns of Arabic numerals combined with text symbols, contextual features and heuristic information were classified according to the senses and sounds of ANEs. Our corpus was made up of news articles issued from January 1st, 2000 to December 31SI, 2001 from 10 major newspapers in Korea. By learning the three phases of learning elements, the system shows 97.52% and 97.29% accuracies for the training set and the test set, respectively. This result shows that the accuracy of our system is 9.72% higher than that of a current TTS system for Korean.

114    S.H. Ahn, B.S. Sim, D.Y. Chi, K.N. Park, C.Y. Lee, Y.J. Kim, "Smith predictor control for water pressure control system with time delay," Industrial Electronics Society Annual Conference, Vol.1 , pp. 663- 666 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Time delays between the controller outputs and the plant outputs are common phenomena in many industrial processes and are a cause of considerable difficulties in an effective control of such processes. In this paper, the design and implementation of a digital Smith predictor controller is introduced for a real water pressure control system, which has a time delay between the controller output and the plant output. The experimental result show the excellent control performance regardless of the time delay.

115    Li Xie, "Robust H/sub /spl infin// control for uncertain stochastic time-delayed systems with saturating nonlinear actuators," Industrial Electronics Society Annual Conference, Vol.1 , pp. 667- 671 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The robust H/sub /spl infin// control problem is presented for uncertain stochastic time-delayed systems with saturating nonlinear constraints in the actuators. In this system, the parameter uncertainties are assumed to satisfy norm-bounded conditions, and the time delays exist in state and control simultaneously. Sufficient conditions for the existence of stochastic robust stabilization controller and stochastic robust H/sub /spl infin// controller are presented in terms of linear matrix inequality. With the controllers, the closed-loop systems are robust stochastic stable with a prespecified H/sub /spl infin// disturbance attenuation coefficient /spl gamma/.

116    J. Higaki, A. Imagi, Y. Yoshikuwa, Tae Hyun Kim, T. Yoshizawa, M. Sugawara, "Control-system development of a high-speed electromagnetic actuator in consideration of the delay in the control force," Industrial Electronics Society Annual Conference, Vol.1 , pp. 672- 677 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A control system for a high-speed electromagnetic actuator contains the problems of electromagnetic nonlinearity, a rising current lag, and a lag in the control force caused by an eddy current. In this paper, we conduct a simulation and a control experiment that take those influences into account. Our results confirmed the effectiveness of the control method, which provides compensation for the nonlinearity of the control force, the rising current lag and the control force lag.

117    Shanbin Li, Zhi Wang, Youxian Sun, "Observer-based compensator design for networked control systems with long time delays," Industrial Electronics Society Annual Conference, Vol.1 , pp. 678- 683 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Network-induced delays in the networked control systems (NCS) are inevitable and have a significant effect on system performance. In this paper, time-varying delays are regarded as the sum of the mean delays and uncertain delays. Furthermore, NCS with long time delays is modelled as a discrete-time model with structural uncertainty for its time-varying network-induced delays. Based on the model, a new control law via an iterative linear matrix inequality (LMI) approach is presented which can stabilize the closed-loop system. Theoretical analysis and simulation results compared to some existing schemes show that the control strategy presented in this paper is effective and feasible.

118    H. Oya, K. Hagino, M. Matsuoka, "Observer-based guaranteed cost control scheme for polytopic uncertain systems with state delays," Industrial Electronics Society Annual Conference, Vol.1 , pp. 684- 689 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals with a design problem of an observer-based guaranteed cost controller for polytopic uncertain systems with state delays. In this approach, firstly a full order observer is designed and next a feedback controller ensuring an upper bound on a given quadratic cost function is derived. In this paper, we show that sufficient conditions for the existence of the observer-based guaranteed cost controller are given in terms of linear matrix inequalities (LMIs). Additionally, we deal with a design problem of a suboptimal observer-based guaranteed cost controller. Finally, a numerical example is included.

119    G. Hwang, N. Ando, P. Szemes, H. Hashimoto, "Development of single-master multislave telemicromanipulation system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 690- 695 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel single-master (PHANToM haptic device) multislave telemicromanipulator system using two parallel mechanism micromanipulators as a slave device. Firstly, the motivation of this research is mentioned. Then, the system structure and the configuration of our experimental system are introduced. In this system, there exists singular position problem which prevents precise and flexible movement of parallel mechanism manipulators. Through several simulations like a rectilinear movement, singular position and the manipulability of the dual-micromanipulator system is analyzed. Also, the different kinematical configuration and the different DOF between the master and the slave introduces a mapping problem which can be serious for some cooperative manipulations. Therefore, the mapping method between the master and the slave is discussed in this paper. A manipulation strategy to build the system that human and both manipulators perform the cooperative manipulation is also introduced. Finally, several experimental and simulation results are shown to verify the proposed system.

120    Qijun Pan, Weiming Ma, Dezhi Liu, "A practical formula to calculate critical value of the interphase reactor in a six-phase diode rectifier with tap-changer," Industrial Electronics Society Annual Conference, Vol.1 , pp. 696- 699 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a formula to calculate the critical value of interphase reactor (IPR) in a six-phase rectifier with tap-changer. Simulation and experimental results verify the validity of the calculation approach. The calculated critical value is accurate enough to meet the engineering need. The parameter of the reactor must be larger than the critical value. On the basis of theoretical analysis, a simple and effective method is provided to design the interphase reactor. On balance, the above achievements play an important role in the design of the interphase reactor.

121    Dongbai Zhu, "Study of the stepless inductance change using power switch," Industrial Electronics Society Annual Conference, Vol.1 , pp. 700- 703 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new method of stepless inductance change is proposed in this paper based on the use of power switch. The circuit topology and its theoretical analysis are given in detail. The related simulation is performed using the software of MATLAB/sup /spl trade// and PSCAD/EMTDC/sup /spl trade//. Finally, both the actual test results and calculating value are presented, which accords with the simulating results. It is shown from the results that the inductance value can be regulated rapidly and accurately, moreover, the inductance value can be changed according to the requirements for providing necessary detecting signal in the circuits.

122    Z. Salam, "An on-line harmonics elimination PWM scheme for three-phase voltage source inverter using quadratic curve fitting," Industrial Electronics Society Annual Conference, Vol.1 , pp. 704- 708 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An on-line harmonic elimination PWM (HEPWM) scheme for three-phase voltage source inverter is proposed. It is based on quadratic curve fitting of the trajectories of the exact HEPWM angles. The main advantage of the technique is that it can be efficiently implemented using a simple low cost microprocessor. An outline to obtain the approximate HEPWM switching angles is presented. To check the accuracy of the method, an error analysis is carried out. The scheme is validated by experimental results.

123    Jinbang Xu, Jin Zhao, Ling Luo, Xiaozhen Ma, Shuyun Wan, "A new control strategy of unity power factor for three-phase PWM rectifier system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 709- 714 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: According to the characteristics of high frequency rectifier systems, this paper proposed a fuzzy-logic PI-type voltage controller for the outer loop of the system with optimized control rule and membership function distribution based on fuzzy control principle so as to improve the dynamic response of direct busbar voltage. At the same time, the inner loop used proportional current adjuster with space-vector control scheme in order to increase the tracking speed of the current to the voltage and decrease the harmonic of the input current of the electrical network and the direct busbar voltage. We have made check experiment of traditional PI controller versus fuzzy controller and SPWM control scheme versus SVPWM control scheme based on Matlab-Simulink platform and we can conclude that this method can greatly improve the performance of the system without changing the topology of the original system and increasing the complexity of the adjuster implementation and it is of great importance for the engineering experience.

124    Cai Jing, Cao Hui-ling, Gu Guo-biao, "Research on the isobaric evaporative cooling system of power thyristor," Industrial Electronics Society Annual Conference, Vol.1 , pp. 715- 718 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper discusses with the application field of power thyristor. Power thyristor will produce a great quantity of heat, and the standard of its rated current is temperature. With the increase of the current capacity, it demands more efficient cooling systems. Therefore, the study of cooling is a matter of great significance. Evaporative cooling is a high efficient and cleaning cooling method. In the airtight cooling system, the inner pressure increases with the increase of the heat load. When the environmental temperature is high, the inner pressure may be 0.3 MPa, and it is much dangerous. For this reason, an isobaric evaporative cooling system is put forward.

125    Young Hwan Lho, Ki Yup Kim, "A /spl gamma/ effect on the power MOSFET," Industrial Electronics Society Annual Conference, Vol.1 , pp. 719- 722 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The electrical characteristics of solid state devices such as BJT (bipolar junction transistor) and MOSFET, etc. are altered by impinging photon radiation and temperature in the space environment In this paper, the threshold voltage, the breakdown voltage, and the on-resistance for the two kinds of MOSFET's (200 V and 100 V of V/sub DSS/) are tested to /spl gamma/-irradiation and compared with the specifications under the pre and post irradiation of low dose rates of 4.97 and 9.55 rad/sec, and maximum total dose of 30 Krad. In our experiment, the /spl gamma/ radiation facility with low dose available at KAERI (Korea Atomic Energy Research Institute) has been applied on two commercially available IR (International Rectifier) products of IRFP250 and IRF540.

126    Lina Wang, Kai Sun, Lipei Huang, "A novel method to enhance the voltage transfer ratio of matrix converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 723- 728 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The lower voltage transfer ratio is one of the shortcomings of matrix converter. The upper limit of voltage transfer ratio under indirect space vector modulation is 0.866. In the course of experiments, it is found that the actual voltage transfer ratio is lower than the expected one. The main reason of this limit is deeply analyzed in the paper. In order to enhance the voltage transfer ratio, an adaptive modulation rate regulation method is proposed. The voltage transfer ratio can be enhanced by 9.75% using the proposed method. The disadvantages of the proposed method are also discussed. The applicable load types are given. Simulation and experimental results verify the theoretical analysis.

127    Xin Yang, Y.C. Liang, G.S. Samudra, Yong Liu, "Tunable trench gate power MOSFET: a feasible superjunction device and process technology," Industrial Electronics Society Annual Conference, Vol.1 , pp. 729- 733 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For power semiconductor MOSFET devices, the oxide-bypassed structure utilizes the oxide thickness control in fabrication instead of the complicated doping control in translating the unipolar on-resistance R/sub ON/ versus the blocking voltage V/sub BR/ tradeoff limit beyond the conventional unipolar silicon limit. The structure also provides the option to utilize an additional bias voltage to compensate possible process variations in order to enhance the breakdown voltage. This paper describes the structure, fabrication process and the laboratory results on the tunable oxide-bypassed trench gate power MOSFET. The technology is proven to be feasible in making superjunction MOSFET devices for power electronic applications.

128    Zhou Lin, Shen Xiaoli, Zhou Luowei, Lei Peng, "Unified constant-frequency integration control of four-arm three-phase four-wire active power filter with vector operation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 734- 738 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a unified constant-frequency integration (UCI) control for a three-phase four-wire active power filter (APF) with vector operation. Using this method only AC mains current and zero voltage crossing point are sensed. No sensors for the load current and the APF inductor current are required. Furthermore, there is no need to calculate the reference for APF inductor current so that complicated digital computation is eliminated. Three-phase unity-power-factor and low THD are achieved by integration with reset along with a few logic and linear components. And the amount of switching are operated at high frequency reduced, thus, the switching losses is optimized. In this paper analysis and simulation are carried out with the four-arm inverter, the simulation results verified that the APF with UCI control can effectually compensate the harmonics, reactive current and zero sequence current.

129    Lei Hu, Wuhua Li, A. Chen, Xiangning He, "A fully decentralized autonomous module for power electronic converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 739- 743 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A fully decentralized autonomous power module (FDAM), which is a subsystem with the power devices integrated with drive, protection and microcontroller, is proposed in this paper. It is convenient to apply the digital control to the power converters constructed by FDAM because of the integrated microcontroller. By using this module, some kinds of power converters can be easily constructed without any additional parts. Simultaneously, it is suitable to use the FDAM in the applications requiring complex and advanced control schemes. In this paper, the structure of the FDAM is introduced and the phase-decoupled control methods suitable for FDAM converters are discussed. The laboratory prototype of the FDAM is implemented with discrete components and general-purpose digital signal processor (DSP). Its advantages as well as the validity of the control methods are verified through experiments.

130    Se-Joo Kim, Yong-Ho Yoon, Kyun-Ha Jeong, Chung-Yuen Won, "A low cost position sensing method of switched reluctance motor using reflective type photo-sensors," Industrial Electronics Society Annual Conference, Vol.1 , pp. 744- 748 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Normally the position of the rotor is measured with absolute-encoder, resolvers and the incremental encoder. Then, the information of the rotor's position is used to drive the SRM. However, for a simple driving system that doesn't require precise control, it is not advisable to use expensive encoders and highly efficient microprocessors. In this paper, we introduce an economic method by replacing the conventional opto-interrupter and slotted-disk to only the reflective type photo-sensors, which removes not only a slotted disk section but drives three-phase 6/4 pole SRM forward and reverse. Also, only common analog devices are used for the control circuit, making the process more economical.

131    J. Praveen, B.P. Muni, S. Venkateshwarlu, H.V. Makthal, "Review of dynamic voltage restorer for power quality Improvement," Industrial Electronics Society Annual Conference, Vol.1 , pp. 749- 754 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Power quality has always been important for customers, but with increasing applications of electronic loads and controllers sensitive to the power quality, the subject has attracted renewed interest in recent times. Power quality encompasses several aspects: harmonics, over voltage, flicker voltage sags and swells, interruptions etc., lasting only a few cycles can cause significant damage for a manufacturing process and computer hardware installations. Voltage source converter based dynamic voltage restorer (DVR) can be used effectively for mitigation of voltage sag and swells. This paper presents the operating principle, power circuit topologies, mathematical modeling, control philosophies and applications of DVR for power quality improvement along with systematic review of published literature.

132    Z.M. Ye, P.K. Jain, P.C. Sen, "Performance comparison of inverter structures for high frequency AC distributed power supply system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 755- 760 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper makes a comparison of various possible structures of high frequency resonant inverters. Four candidate topologies will be examined, that is, single stage resonant inverter with half bridge asymmetric PWM (SSRI-1), single stage resonant inverter with full bridge phase-shift PWM (SSRI-2), two stage with buck and resonant inverter (TSRI-1), and two stage with resonant inverter and AC chopper (TSRI-2). For each topology, the merits and demerits, as well as feasible application potentials will be highlighted. Power losses of the inverters will be analyzed and possible soft switching solutions for switching loss reduction will be studied. The waveform quality of the inverters will be analyzed as well.

133    Xuejun Ma, Wei Wang, Yong Kang, Jian Chen, "Series of two transistors forward ZVZCS converter with phase-shifted control for high input voltage," Industrial Electronics Society Annual Conference, Vol.1 , pp. 761- 766 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a soft switching series two transistor forward converter (STTFC) in interleaving for high input voltage. Two identical two transistor forward converters are connected in series. The voltage stress of switching device and freewheeling diode is only half the input voltage. In control method, phase-shifted control is applied. All the switches are turned off with zero voltage switching (ZVS), leading switches are turned on with a zero voltage and and zero current switching (ZVZCS), lagging switches are turned on with zero voltage switching (ZCS). The advantages of the proposed topology is high reliability, high efficiency and low cost. The circuit prototype, theoretical analyses and the experimental results of the converter for input voltage 600-1200V, output 24 V/20 A, 20 kHz are presented. The principle balancing voltage automatically is discussed. The effect factors of the efficiency are analyzed. The design is suitable for high input voltage and high power application.

134    X. Xu, A.M. Khambadkone, R. Oruganti, "An asymmetrical half bridge flyback converter with zero-voltage and zero-current switching," Industrial Electronics Society Annual Conference, Vol.1 , pp. 767- 772 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the analysis and design of an asymmetrical half bridge flyback DC-DC converter is presented, which can minimize the switching power loss by realizing the zero-voltage switching (ZVS) during the transition between the two switches and the zero-current-switching (ZCS) on the output diode. As a result, high efficiency can be achieved. The principle of the converter operation is explained and analyzed. In order to ensure the realization of ZVS in operation, the required interlock delay time between the gate signals of the two switches, the transformer leakage inductance, and the ZVS range of the output current variation are properly calculated. Experimental results from a 8 V/8 A, 200 kHz circuit are also presented, which verify the theoretical analysis.

135    Rong-Jong Wai, Chung-You Lin, Rou-Yong Duan, "High-efficiency DC-DC converter with high voltage gain and reduced switch stress," Industrial Electronics Society Annual Conference, Vol.1 , pp. 773- 778 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this study, a high-efficiency DC-DC converter with high voltage gain and reduced switch stress is proposed. In the proposed topology, a three-winding coupled inductor is used for providing a high voltage gain without extreme switch duty-cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor is released directly to the output terminal for avoiding the phenomenon of circulating current and the production of switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor is manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency power conversion. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source with 250 watts nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy.

136    Jung-Bum Kim, Nam-Ju Park, Dong-Yun Lee, Dong-Seok Hyun, "A simple control scheme for DC output ripple voltage suppression in BIFRED with a small-sized energy storage capacitor," Industrial Electronics Society Annual Conference, Vol.1 , pp. 779- 783 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a technique to reduce the low frequency ripple voltage of the DC output in a BIFRED converter with a small-sized energy storage capacitor. The proposed pulse width control method can be effectively used to suppress the low frequency ripple appeared in the DC output and still shows generally good performance such as low THD of input line current and high power factor. Using the small-sized energy storage capacitor, it has better merits of low cost and small size than a conventional BIFRED converter. The proposed technique is illustrated its validity and effectiveness through simulations.

137    Won-Suk Choi, Nam-Ju Park, Dong-Yun Lee, Dong-Seok Hyun, "A new power control scheme of class-D inverter for induction heating jar application with constant switching frequency," Industrial Electronics Society Annual Conference, Vol.1 , pp. 784- 789 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a simple power control scheme for a constant frequency Class-D inverter with a variable duty cycle is proposed. It is more suitable and acceptable for high-frequency induction heating (IH) jar applications. The proposed control scheme has the advantages of not only wide power regulation range but also ease of control output power. Also it can achieve the stable and efficient zero-voltage-switching (ZVS) in whole load range. The control principles of proposed method are described in detail and its validity is verified through simulated and experimental results on 42.8 kHz IGBT for induction heating rated on 1.6 kW with constant frequency variable power.

138    Luowei Zhou, Xiong Du, Quanming Luo, Li Ran, "A new high efficiency three-phase boost type PFC circuit with integration reset control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 790- 795 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a new three-phase boost type power factor correction (PFC) circuit featuring high efficiency owing to further development on a conventional topology and its control. The current handled by the fast switching devices is substantially reduced because of the diverting effect of an extra dual boost stage that works at a lower switching rate. Integrate reset control is adopted to realize the unity input power factor. In addition to the reduced switching losses, this paper also illustrates the following characteristics of the proposed PFC system: (1) constant frequency operation of all switching devices, which is favored by passive filter design, (2) a simplified control scheme without the need of multipliers for current scaling, and (3) good response to maintain the input line current in phase with the corresponding voltage without low-frequency distortion. Simulation and laboratory tests verify the proposed circuit and control algorithm.

139    Alian Chen, Lei Hu, Xiangning He, "A novel cascaded multilevel inverter topology," Industrial Electronics Society Annual Conference, Vol.1 , pp. 796- 799 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel cascaded multilevel inverter topology is proposed in this paper, which is composed of any number of H-bridge cells. The H-bridge cells may be two-level ones, or any level of flying-capacitor ones. Different separate voltage sources may be used in different cells. Compared with the conventional cascaded topology, the new topology requires fewer switching devices and separate voltage sources when producing the same number of output voltage levels. It simplifies the circuit and reduces costs. As an example, a topology composed of a two-level H-bridge cell and a three-level flying-capacitor H-bridge cell is studied in this paper, and the validity is proved by simulated and experimental results.

140    Haiping Xu, Xuhui Wen, Li Kong, "DSP-based digitally controlled bi-directional DC-DC converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 800- 804 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This article presents an analysis of voltage and current control mode of DC-DC converter and proposes a multipurpose controller working in constant voltage/constant current/constant power states alterable. Also discussed here are determination of sampling rate, bits of AD conversion, DPWM resolution and the principle of switch frequency. Meanwhile, an asynchronous sampling method is proposed to ensure the precision of feedback signal, such as output voltage and current. Furthermore, aim at the nonlinear, parameter-changing and time-variant high-frequency switch system, a new type of PID regulator are used to improve the system's stability and dynamic performance. Finally, a 5 kW bi-directional DC-DC converter is built with the DSP-TI320F243. Experiment with it showed that the system has excellent properties and can be used in areas like EV.

141    Hou Zhen Yi, Sun Jin, "Study on control strategy for three-phase four-leg inverter power supply," Industrial Electronics Society Annual Conference, Vol.1 , pp. 805- 809 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a novel control strategy of a three-phase four-leg inverter power supply. In the synchronous coordinate, the control scheme with the output voltage differentiation as inside feedback loop is adopted, and the cross-channel coupling bringing from capacitance is eliminated by the capacitance current feed-forward, the decoupled control of three phase four-leg power supply is achieved. The proposed control strategy has been implemented on a 400 Hz, 1 kW three-phase four-leg power supply. The three-phase output voltage waveform is quite good, it also perform well with the unbalanced load.

142    A. Fratta, G. Griffero, P. Guglielmi, S. Nieddu, G.M. Pellegrino, "Application of new FPGA-based top-performance digital control techniques to PWM power converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 810- 815 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In the field of PWM power converters, the newest low-cost FPGAs are investigated as alternative digital control devices. The paper would show how FPGAs allow for unprecedented performances. A comparative overview of DSP and FPGA is carried-out on loop dynamics vs PWM ripple and noise immunity. The FPGA-based top-performance solution is defined and applied, based on oversampling and parallel processing techniques. An FPGA-based development PCB has been designed and realized accordingly suited to control three different inverters and two H-bridge converters. The new control concepts are applied to coupled DC/DC H-bridge boost converters as the strongest test bench due to multiple PWM properties. Experimental performances are very satisfactory.

143    M. Torres, J. Espinoza, "Modeling and control of a high voltage direct current power transmission system based on active voltage source converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 816- 821 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A nonlinear strategy for a high voltage direct current power transmission system (HVDC) based on voltage-source-converters is proposed. Specifically, a point-to-point monopole link between two three-phase systems which may operate at different frequencies is analyzed. Based on the dq model of the open loop system, the expressions which define its operating points are obtained. These expressions allow the analysis of the operating regions of the system. After the open loop analysis, a control strategy is proposed based on the input-output linearization method. The control strategy allows DC voltage and active power flow regulation as well as decoupled manipulation of the reactive power flows in both AC sides. The control system is tested through computational simulation considering a carrier based PWM technique for the commutation of the switches.

144    Shaosheng Fan, Xuhong Wang, Yushen Zhou, "Neural network based predictive control for active power filter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 822- 826 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A neural network based predictive control strategy for active power filter is presented in this paper. In the strategy, RBF neural network is employed to predict future harmonic compensating current. In order to make the predictive mode! much simpler and tighter, an adaptive learning algorithm for RBF network is proposed. Based on the model output, genetic algorithm is introduced to optimize objective function, which generates proper value of control vector. The neural network based predictive algorithm is used in internal model control scheme to compensate for process disturbances, measurement noise and modeling errors. Simulation test under various conditions is implemented. The results show the neural network based predictive control is more effective and feasible than PI control or digit adaptive control.

145    S.W. Cheon, J.S. Lee, K.C. Kwon, D.H. Kim, H. Kim, "The software verification and validation process for a PLC-based engineered safety features-component control system in nuclear power plants," Industrial Electronics Society Annual Conference, Vol.1 , pp. 827- 831 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper introduces the software life-cycle V&V (verification and validation) tasks for the KNICS (Korea nuclear instrumentation and control system) project. The objectives of the V&V tasks are mainly to develop a programmable logic controller (PLC) for safety-critical instrumentation and control (I&C) systems, and then to apply the PLC (called POSAFE-Q) to developing the prototype of an engineered safety features-component control system (ESF-CCS) in nuclear power plants. As preparative works for the software V&V, various kinds of software plans and V&V task procedures have been developed according to the software life-cycle management. A number of software V&V tools have been adopted or developed to efficiently support the V&V tasks. The V&V techniques employed in this work include a checklist-based review and inspection, a requirement traceability analysis, formal verification, and life-cycle based software testing.

146    Jung-Geun Kim, Young-Gook Jung, Seok-Hwan Na, Young-Choel Lim, "A new random PWM (SRP-PWM) technique for decreasing acoustic noise radiated from v/f controlled motor drives," Industrial Electronics Society Annual Conference, Vol.1 , pp. 832- 837 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: As an effective means to reduce the acoustic noise radiated from v/f controlled inverter fed AC drives, a new three phase PWM (pulse width modulation) technique with separately randomized pulse position (SRP-PWM) is presented and implemented. Each of three phase pulses is located randomly in each switching interval. Along with the randomization of PWM pulses, the space vector modulation is also executed with the SAB C167 microcontroller. The new method is compared with a classic random modulation with a fixed switching frequency modulation. Results of the investigation of an experimental drive system are presented, proving the feasibility of the proposed solution.

147    M. Orabi, T. Ahmed, M. Nakaoka, M.Z. Youssef, "Efficient performances of induction generator for wind energy," Industrial Electronics Society Annual Conference, Vol.1 , pp. 838- 843 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper highlights the induction generator efficiency as a basic factor for operating the wind turbine connected to utility grid, through AC/DC/AC converter, at its maximum power tracking. To have maximum power extracted from the wind turbine through the induction generator, the loading parameters have to be controlled in the direction of maximum efficiency of the induction generator. To analyze the effect of the generator efficiency, a simple equivalent circuit is proposed to represent the AC/DC/AC converter-grid combination as seen by the induction generator to simplify the analysis. The steady state performance of the induction generator is investigated. An accurate range of operation for the load parameters is developed. This analysis is based on the condition of operating the system not only on the maximum power extracted of the wind turbine but also on the maximum induction generator efficiency.

148    Rong-Jong Wai, Rou-Yong Duan, Meng-An Kuo, "High-efficiency fuel cell power conversion system," Industrial Electronics Society Annual Conference, Vol.1 , pp. 844- 849 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This study presents a newly designed topology for a fuel cell energy source conversion in order to supply a highly reliable utility power. Because the fuel cell has the power quality of low voltage as well as high current due to the electrochemical reaction, a high step-up DC-DC converter is utilized for boosting the fuel cell voltage up to a constant DC-bus voltage for the utilization of later inverter. Moreover, a current-source sine-wave voltage inverter is designed in the sense of voltage-clamping and soft-switching techniques. In this power conversion scheme, the output voltage has the salient features of lower distortion, fast dynamic regulating speed and insensitivity to load variation, even under nonlinear loads. In addition, experimental results via an example of a PEM fuel cell generation system with 250 watts nominal power rating are given to demonstrate the effectiveness of the proposed power conversion strategy.

149    Qijun Pan, Weiming Ma, Dezhi Liu, "A study of six-phase diode rectifier with tap-changer interphase reactor," Industrial Electronics Society Annual Conference, Vol.1 , pp. 850- 855 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In power systems with simultaneous AC and rectified loads, it is important to eliminate effectively the AC current harmonic distortion. This paper presents a detailed analysis of six-phase diode rectifier system with tap-changer. Mathematical models are established under reasonable assumptions, considering commutation processes or not. AC current and output DC voltage waveforms are provided via analytic method. Furthermore, a Fourier series expansion of the AC current is presented. According to the theoretical and experimental results, the influential factors of current harmonic distortion are examined and the optimum turn ratio of the tap-changer is derived. Achievements in this paper are a most important technical guidance for the design of the scheme.

150    Ding Kai, Zou Yun-ping, Wu Zhi-chao, Jin Hong-yuan, Liu Fei, "Research on a novel three-phase hybrid asymmetric 9-level inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 856- 861 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposed a novel hybrid asymmetric 9-level inverter in which an asymmetric 5-level inverter and an H-bridge inverter with equal DC bus voltage are series connected to form an inverter phase leg. A new hybrid asymmetric control technique for the novel inverter is proposed. Analysis of output spectral and DC bus voltage unbalancing problem is carried out digital controller design is presented. Simulation and experiment results are provided.

151    il-Song Kim, Myung-Joong Youn, "Single-loop maximum power point tracker with fast settling time," Industrial Electronics Society Annual Conference, Vol.1 , pp. 862- 866 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new single-loop maximum power point tracker with fast settling time is presented. It has a very fast settling time to the maximum power point voltage in spite of rapidly changing environmental conditions compared to the conventional two-loop system. Since it does not require the measurement of voltage derivative to track the maximum power point, its structure is very simple and its operation is straightforward. The controller is composed of a few analog components and thus its reliability is very high. It can be a good substitute for the conventional two-loop system that has a slow response time.

152    E.E. El-Kholy, "High performance induction motor drive based on adaptive variable structure control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 867- 872 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new approach to control system design for induction motor drive is presented. The control method is based on adaptive variable structure design. The mathematical model of the adaptive variable structure controller based on genetic algorithm system is presented. The design is simple and easy to be implemented. Simulation and experimental results show that the proposed adaptive variable structure controller provides high performance dynamic characteristics and is robust with regard to change of motor speed and external load disturbance.

153    Fei Lin, Zhiwen Ma, Hu Sun, Qionglin Zheng, Shousun Chen, "Torque and flux control for induction motor with L/sub 2/ disturbance attenuation," Industrial Electronics Society Annual Conference, Vol.1 , pp. 873- 876 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A robust torque and flux control strategy for induction motor is proposed with L/sub 2/ disturbance attenuation. The L/sub 2/ gain from the disturbance to the penalty signal denotes the robustness of the control system to some extent. The appropriate control method can reduce the L/sub 2/ gain to a given level. The controller design proceeds along two stages. The first stage is to choose the desired flux and current state, which match the control objective. In the second step, the tracking error system is considered and the control law is designed to force the L/sub 2/ gain in a given region. The robustness is verified by simulation results with uncertain rotor and stator resistance.

154    Chien-Feng Hu, Rong-Bin Hong, Chang-Huan Liu, "Stability analysis and PI controller tuning for a speed-sensorless vector-controlled induction motor drive," Industrial Electronics Society Annual Conference, Vol.1 , pp. 877- 882 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The purpose of this paper is to determine the controller parameter tuning range for a speed sensorless vector-controlled induction motor drive from the system stability point-of-view. The tuning rules for conventional PI controllers are mostly based on experience, Trial-and-error procedures are used to tune the values of the controller parameters. The relationship between the tuned controller parameters and the stable operating range of the control system is generally not known. The approach of this paper starts from establishing the complete dynamic models for a sensorless vector-controlled induction motor drive. The nonlinear dynamic models are linearized around a chosen operating point The characteristic equation is then derived, which is used to determine the values of the controller parameters corresponding to the marginal system stability. Based on these critical values, the tuning range of the controller parameters is obtained, which assures stable operation of the drive in the entire operating region and provides a reference for controller parameter tuning.

155    Young-Dae Son, Tae-Won Heo, E. Santi, A. Monti, "Synergetic control approach for induction motor speed control," Industrial Electronics Society Annual Conference, Vol.1 , pp. 883- 887 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the synergetic control approach for induction motor speed control using indirect vector control. Synergetic control theory has several advantages: it is well suited for digital control purpose and it operates at constant switching frequency, which simplifies filtering design, and reduces chattering, while maintaining the intrinsic robust features of sliding mode control. To verify the performance characteristics of this synergetic control scheme, we compare it with two other control schemes such as integral sliding mode control and fuzzy sliding mode control, a fuzzy logic variant of sliding mode control, developed with the objective of reducing the torque chattering problem. Finally, the effectiveness of this control scheme for robust AC servo drive system is confirmed through simulation in the C language.

156    N. Senthil Kumar, K. Saravanan, "Speed control of PMSM drive using VSI," Industrial Electronics Society Annual Conference, Vol.1 , pp. 888- 895 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Voltage-source-inverter fed PMSM has received widespread interest in high precision industrial drive applications. Insulated gate bipolar transistor (IGBT) based pulse width modulation (PWM) inverter are commonly used in inductive load circuits such as motor control. Complete drive system is implemented in real time using the digital signal processor of TMS320C40. Current control of PWM voltage source inverters can be broadly classified as hysteresis and constant switching frequency PWM control (with sine triangle).

157    Hag-Wone Kim, N. Van Nho, Myung-Joong Youn, "Current control of PM synchronous motor in overmodulation range," Industrial Electronics Society Annual Conference, Vol.1 , pp. 896- 901 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a study on a current control of a PM synchronous motor which is fed by two-level voltage source inverter in the high modulation index area. In order to increase dynamic response and extend speed limit caused by limit voltage, overmodulation methods is generally used. However, the voltage ripple in the overmodulation region generates current ripple. Because of this current ripple, the current controller with high bandwidth makes entire system unstable. In this paper, a new current controller with ripple compensation has been proposed. By the proposed method, speed dynamics can be improved and stable current control can be achieved.

158    Chien-Ming Wang, Yen-Nien Wang, Chia-Hao Yang, "A novel single-stage ZVS-PWM buck-boost inverter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 902- 907 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel single-stage zero-voltage-switching pulse-width-modulation (ZVS-PWM) buck-boost inverter is proposed in this paper. The output voltage of the proposed inverter can be larger or lower than the DC input voltage, depending on the instantaneous duty-cycle. This property is not found in the classical voltage source inverter, which produces an AC output instantaneous voltage always lower than the DC input voltage. Furthermore, in the proposed inverter, besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage stress and current stress. An average approach is employed to analyze the system. A design example of 1000 W ZVS-PWM buck-boost inverter is examined to assess the inverter performance.

159    Chien-Ming Wang, Yen-Nien Wang, Chia-Hao Yang, "A new ZVS-PWM full-bridge step-up/down converter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 908- 913 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel zero-voltage-switching pulse-width-modulation (ZVS-PWM) full-bridge transformer-isolated step-up/down converter is proposed in this paper. The output voltage of the proposed converter can be larger or lower than the DC input voltage, depending on the instantaneous duty-cycle. This property is not found in the classical full-bridge transformer-isolated converter. Furthermore, in the proposed converter, besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage stress and current stress. An average approach is employed to analyze the system. A design example of 1000 W ZVS-PWM full-bridge converter is examined to assess the converter performance.

160    K.-B. Lee, F. Blaabjerg, "Performance improvement of servo machine for low speed operation using RBFN disturbance observer," Industrial Electronics Society Annual Conference, Vol.1 , pp. 914- 919 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new scheme to estimate the moment of inertia in the servo motor drive system in very low speed is proposed in this paper. The typical speed estimation scheme in most servo system for low speed operation is sensitive to the variation of machine parameters, especially the moment of inertia. To estimate the motor inertia value, the observer using the radial basis function networks (RBFN) is applied. The effectiveness of the proposed inertia estimation method is verified by experiments. It is concluded that the speed control performance in the low speed region is improved with the proposed disturbance observer using RBFN.

161    Chang-Hua Lin, Ying Lu, Yu-Kang Lo, Kai-Jun Pai, Yung-Yi Wang, "Control strategy for eliminating the temperature effect of piezoelectric transformer in the backlight module," Industrial Electronics Society Annual Conference, Vol.1 , pp. 920- 925 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel control strategy for eliminating the temperature effect of piezoelectric transformer (PT) in the backlight module is proposed in this paper. To overcome the drawbacks of the conventional electromagnetic transformer and miniaturize the backlight module, the PT is adopted for driving the cold cathode fluorescent lamp. In addition, a phase-locked loop (PLL) is incorporated into the original backlight system as a feedback mechanism to track the optimal operating frequency of PT, such that the temperature effect of PT is eliminated, and hence the system efficiency and stability are promoted. The feedback parameter used in the presented system is the phase component instead of the traditionally employed lamp current amplitude. A simple model and design procedure are both constructed by reasonable parameter simplification and combination schemes. Complete analysis and design considerations are discussed in detail in this paper. Experimental results agree with the theoretical prediction.

162    T.-H. Kim, H.-W. Lee, M. Ehsani, "Advanced sensorless drive technique for multiphase BLDC Motors," Industrial Electronics Society Annual Conference, Vol.1 , pp. 926- 931 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The main purpose of this paper is to develop a new position sensorless drive method for multiphase brushless DC (BLDC) motors. A BLDC motor with higher number of phases has several advantages. It can reduce the ampere-turns and torque pulsation and increase the efficiency and iron utilization. Also, it is well used for fault tolerant motor drive systems as in military applications. With the developed speed-independent, new position information that is computed in a microprocessor, highly accurate sensorless operation can be realized for multiphase BLDC motors. The operational principle of the proposed sensorless drive for multiphase BLDC motors is theoretically analyzed and the performance is demonstrated by computer simulations and experiments in detail.

163    S. Meo, A. Perfetto, L. Piegari, F. Esposito, "A ZVS current fed DC/DC converter oriented for applications fuel-cell-based," Industrial Electronics Society Annual Conference, Vol.1 , pp. 932- 937 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper deals with a new ZVS (zero voltage switching) half-bridge current-fed DC-DC converter for fuel-cell based inverter system suitable to be coupled with fuel-cells sources. The spreading of fuel-cells has impelled a deep study of DC/DC converter structures properly designed to solve problems connected with the use of fuel cells as primary energy source. A good solution is represented by half-bridge current-fed DC-DC converter. The paper focuses on this kind of converter proposing a modification of the base structure in order to achieve ZVS operation. Moreover, in the paper, a full analysis of the proposed structure is presented and SABER numerical results are shown and compared with results obtained with an hard-switch half-bridge current-fed DC-DC converter. The results prove the very good performance of the suggested solution.

164    A. Orellana, B. Piepenbreier, "Fast gate drive for SiC-JFET using a conventional driver for MOSFETs and additional protections," Industrial Electronics Society Annual Conference, Vol.1 , pp. 938- 943 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new gate drive for SiC-JFET (silicon carbide junction field effect transistor) is developed and tested on a half-bridge. For the realization of a fast gate drive, which offers full protection for the SiC-JFET, a gate drive concept is firstly chosen. The gate drive unit has an output stage made for MOSFETs, a new kind of fast signal isolator, short circuit protection and overvoltage protection.

165    Seong-Hwan Na, Hyun-Soo Kim, Seong-In Moon, "Electrochemical study of Si doped LiNi/sub x/Mn/sub y/Co/sub (1-x-y)/O/sub 2/ as cathode material for Li-ion secondary battery," Industrial Electronics Society Annual Conference, Vol.1 , pp. 944- 947 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new synthetic route of Li[NiMnCo]O/sub 2/ was contrived and its electrochemical characteristics were enhanced by doping small amount of Si. The newly synthesized Li[NiMnCo]O/sub 2/ showed the capacity of 175 mAh/g and good cycle life at as high cut-off voltage as 4.5V. Si-doped material showed improved rate capability, specific capacity, and cycle life. It seems that the increased lattice parameters and lowered electrochemical impedance are the main causes for the improvement.

166    K. Iwawaki, M. Watada, S. Takatani, Y.-S. Um, "The design of core-type transcutaneous energy transmission systems for artificial heart," Industrial Electronics Society Annual Conference, Vol.1 , pp. 948- 952 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, artificial heart (AH) is noticed as the alternate method of the heart graft. Though there are many problems and defect on AH, long term durability, miniaturization and weight saving interfaced with flow rate performance, efficiency of device. Considering rehabilitation into the society and advancement of QOL (quality of life), the construction of power source, which supplies electric power to the device, is important and has many problems. Especially, the electric feeder line restricts behavior of the transplant recipient and disturbs rehabilitation into the society. For solving these problems, transcutaneous energy transmission system (TETS) is noticed and studied. This study proposes core-type TETS. It achieves high magnetic coupling and position stability compared with air-core-type TETS which is carried out on clinical study. Because core-type TETS has high magnetic coupling, it is possible to reduce the input current and to miniaturize trans size. This paper mentions the design of core-type TETS.

167    Tae-Jin Kim, Geun-Hie Rim, Cheul-U Kim, "Development of a power supply for the pulse MIG arc welding with the changes of output current polarity," Industrial Electronics Society Annual Conference, Vol.1 , pp. 953- 956 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Joining thin aluminum alloy is difficult using most welding techniques. Many of the problems associated with burn-through by the high heat input. Common welding techniques are TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and PULSE-MIG welding. The method provides more control of the heat balance in the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities. In this paper, we proposed a new welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, penetrations by this method are presented.

168    Dong-Myung Lee, T.G. Habetler, R.G. Harley, J. Rostron, T. Keister, "Voltage distribution and design for lightning surge of A PWM-switched autotransformer-based sag supporter," Industrial Electronics Society Annual Conference, Vol.1 , pp. 957- 962 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper discusses the design of a voltage sag supporter (VSS) device for lightning surge protection. This novel distribution-level voltage control device can compensate voltage sag and swell conditions in three-phase power systems. It is based on a pulse width modulated (PWM) autotransformer. The proposed scheme is able to quickly recognize the voltage sag or swell condition, and it can correct the voltage by either boosting the input voltage during voltage sag events or reducing the voltage during swell events. There exist two possible configurations, series and shunt types. Since the majority of voltage sag events occur under severe weather conditions, the voltage distribution of the system under lightning surge must be investigated. The distribution of voltage across the switches during normal conditions as well as lightning surge conditions is evaluated for both the series and shunt type of VSS circuits. Based on these results, the shunt type VSS is preferred.

169    N. Mutoh, M. Nakanishi, M. Kanesaki, J. Nakashima, "EMI noise controlling methods suitable for electric vehicle drive systems," Industrial Electronics Society Annual Conference, Vol.1 , pp. 963- 968 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Methods to control EMI noises, especially common mode currents and radiations which are generated in electric vehicle (EV) drive systems, are studied in this paper. EMI noises, including common mode currents and near magnetic fields were measured using a prototype of the EV drive systems. FFT analyses of the voltage and current appearing in the EV drive systems showed that EMI noise sources are produced by voltage fluctuations occurring at the time of switching operations and the produced noise sources cause common mode currents to flow into the ground when the body frame is connected to the ground. Moreover, the flowing common mode currents induce radiated EMI noises while the generated EMI noises are transmitted between the inverter, batteries and motors; thus the produced radiated EMI noises have an effect on nearby vehicles. A method is proposed that controls common mode currents produced in EV drive systems so as to prevent a series resonance phenomenon from occurring in common current paths formed in EV drive systems. This technique is also effective in controlling radiated EMI noises. Furthermore, in order to control radiated EMI noises, a method is proposed that cancels the surface current flowing in P and N power transmission lines between the inverter and batteries. Effectiveness of these proposed EMI noise controlling methods was verified from simulations and experiments.

170    A. Arias, G. Asher, M. Sumner, P. Wheeler, L. Empringham, C. Silva, "High frequency voltage injection for the sensorless control of permanent magnet synchronous motors using matrix converters," Industrial Electronics Society Annual Conference, Vol.1 , pp. 969- 974 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper investigates the influence of the power converter on the performance of surface mounted permanent magnet synchronous motor drives, which employ high frequency voltage injection to achieve low speed control. The effects of IGBT voltage drop, deadtime and deadtime compensation on position estimation are discussed and the use of matrix converter is proposed to reduce these effects. Simulation and experimental results demonstrate the superior performance of the system employing the matrix converter for sensorless position estimation.

171    S. Ichikawa, M. Tomita, S. Doki, S. Okuma, "Sensorless control for all types of synchronous motors using an on-line parameter identification," Industrial Electronics Society Annual Conference, Vol.1 , pp. 975- 980 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, I propose an on-line parameter identification method for all types of synchronous motors: especially, three main types, surface permanent magnet synchronous motors, interior permanent magnet synchronous motors, and synchronous reluctance motors. And sensorless control of synchronous motors using these identified parameters is realized. The proposed estimation method is based on an Extended EMF model, so the sensorless control method can be applied for all types of synchronous motors. And this identification method is based on the motor model that takes into account magnetic saturation, motor parameters can be identified in spite of generating magnetic saturation. The proposed method is verified by experiments of three kinds of synchronous motors.

172    Zhigan Wu, Genfu Zhou, Jianping Ying, "High dynamic sensorless BLDCM drive with very wide speed range," Industrial Electronics Society Annual Conference, Vol.1 , pp. 981- 986 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper develops an tin-attenuated BEMF detection method for sensorless BLDCM drive. The un-attenuated BEMF can be directly obtained from the terminal voltage of the floating phase without voltage dividing and filtering. As a result, this approach makes it possible to detect the rotor position over a wide speed range, especially at a lower speed. A simply correction is proposed to asymmetry back EMF ZCP detection due to parasitic capacitance and discontinuous current at light load. Also a fast startup procedure is presented for the induced BEMF signals are zero when motor is at rest. Experimental results show that the schemes implemented are feasible and very wide speed range and high dynamic performance are achieved.

173    Der-Fa Chen, Tian-Hua Liu, Che-Kai Hung, "Design and implementation of a sensorless PMSM drive including standstill starting," Industrial Electronics Society Annual Conference, Vol.1 , pp. 987- 992 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper proposes a novel sensorless PMSM system, driven by a matrix converter. In this paper, first, a standstill starting technique is proposed. Then, a flux/rotor position estimating technique is proposed to obtain the shaft angle of the motor and achieve a closed-loop system. Finally, a 32-bit TMS320C40 digital signal processor is used to execute the starting and sensorless techniques, and all of the control loops, including a current-loop and a speed-loop. Several experimental results are shown to validate the theoretical analysis.

174    K. Jezernik, E. Urlep, "Speed sensorless sliding mode torque control of PMSM," Industrial Electronics Society Annual Conference, Vol.1 , pp. 993- 998 Vol. 1, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Speed sensorless permanent magnet synchronous motor torque and flux tracking control algorithm is presented. Proposed approach addresses the problem of operation at both, low and high speed. The idea is realized using a nonlinear closed loop rotor flux observer and stator resistance adaptation algorithm. The analysis of the proposed method is included. The major attention is paid to torque control and then the developed approach utilized for speed control. Such control scheme was implemented on a DSP system and verified experimentally.

IEEE Industrial Electronics Society Annual Conference

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1    Liu Changliang, Liu Jizhen, Niu Yuguang, Jin Xiuzhang, "Nonlinear modeling and simulation for large scale coal-fired power unit," Industrial Electronics Society Annual Conference, Vol.3 , pp. 1983- 1986 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: On the basis of analysis to the boiler models that have exist, the modeling method and simulation environment for large-scale coal-fired power unit are discussed. The power unit is divided into many parts; a set of dynamic model library of thermal equipment and subsystem is setup on with modularization modeling method. The simulation environment is selected as MATLAB/simulink and S-function is used. The integrated dynamic model of 300 MW coal-fired power unit is set up in simulink.

2    Jieng-Jang Liu, Yee-Pien Yang, "Comparison of AFC and FACT method for periodic disturbance suppression in optical disk drives," Industrial Electronics Society Annual Conference, Vol.3 , pp. 1987- 1992 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The adaptive frequency control (AFC) and frequency adaptive control technique (FACT) are effective methods in eliminating periodic disturbances. Especially for cancellation of repeatable runout in hard disk drives (HDD), AFC schemes have been applied successfully. This paper presents and compares the applicability from such two methods in optical disk drives (ODD). A surprising result is that a DC content dominating the periodic error signals is necessary for AFC schemes to function properly. This implies that AFC is inapplicable in systems where the DC content is small or intended to be reduced. The property is analytically examined through the well-known amplitude modulation (AM) process and is verified experimentally on the disk wobble compensation in ODD. Experimental results show that FACT has better properties than AFC in terms of DC reduction and harmonic independence. It is also shown that AFC fails if the DC content and harmonics are compensated simultaneously. Regarding the application on ODD, the FACT scheme is practical in disk runout and wobble control.

3    Weirui Wang, Shuangxia Pan, Fang Wang, "A comparison study of two disturbance rejection control strategies for hydraulic position servo systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 1993- 1996 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In hydraulic position servo systems, the parametric uncertainties, the inherent nonlinear characters of hydraulic system and the large variations of payload affect the tracking precision and robust performance. A disturbance observer based control scheme and an integral extended state observer based nonlinear control scheme called active disturbance rejection control are proposed in this paper. A comparison study of these two disturbance rejection control strategies for hydraulic position servo systems has been undertaken. Simulation and experimental results show that the active disturbance rejection control is much superior in dealing with system dynamic uncertainties and disturbances.

4    Chen Yueyan, Zhao Ji, Wang Bidou, Han Shuang, "A high-precision fuzzy control algorithm with self-regulating factor for trajectory tracking in virtual-axis polishing machine tool," Industrial Electronics Society Annual Conference, Vol.3 , pp. 1997- 1999 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we present a new trace-tracking control algorithm, in which a self-regulation factor is adopted to realize real-time position control with high-precision fuzzy controller. The mover current is adjusted by given acceleration to implement real-time control and to enhance the characteristic of trajectory tracking in virtual-axis polishing machine. The experiment results demonstrate that high-precision real-time trajectory control of position, speed and acceleration in each link has attained and the static and dynamic characteristics of machine are enhanced.

5    Ik Sung Choi, Byoung Joon Aim, Ju Yong Choi, Yu Shin Chang, Man Hyung Lee, "Full stand modeling and tension control for the hot strip finishing mill," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2000- 2005 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We describe a looper controller design for a hot strip finishing mill in steel plants. To ensure strip quality, it is very important to control the tension of the hot strip finishing mill. However, because of a mutual interaction between the looper angle and the strip tension, it is difficult to control the looper system. Previous researches examined only the operation of a single stand. But it is not sufficient to examine the operation and effect of whole stands because the operation is wholly interdependent. In this paper, we present a full model of the hot strip finishing mill in order to more effectively control strip tension. We propose several control methods for the full-stand hot strip finishing mill, denoted as conventional PI, PI with cross gain, and CDM PID control. In the real plants, there are some problems by using higher order controllers such as LQ, LQG and H/sub /spl infin//. By comparison, the PID controller is very simple and easy to apply to all real plants. To that end, we present our findings on PID controls and their potential use in the hot strip finishing mill.

6    Xuemei Zhu, Weirong Hong, Shuqing Wang, "Implementation of advanced control for a heat-integrated distillation column system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2006- 2011 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Unlike steady-state optimization and linear model predictive control, dynamic optimization and nonlinear model predictive control is underway to industry application. This paper discusses the implementation issues of two-level control strategy integrated dynamic real-time optimization and nonlinear model predictive control of a heat-integrated distillation column system. To realize this scheme, four nonlinear programming problems: economic operation optimization, data reconciliation and state estimation, parameter estimation and nonlinear model predictive control, are considered based on system rigorous dynamic model. The economic operation optimization is to minimize the cost of the plant. The unmeasured states are estimated by measurements of temperatures, pressures and flow rates. Time-variant parameters such as tray efficiencies and feed composition are updated on-line. The sequential quadratic programming and orthogonal collocation are used to solve the dynamic nonlinear optimization problems.

7    Ji Hyeong Lim, Taek Young Shin, Hyo Moon Lee, Jae Ok Kim, Mun Ki Lee, Jung Hyen Park, In Soo Kim, Man Hyung Lee, "Development of an unmanned vehicle driving system by the MPC sensors," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2012- 2015 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we study a traveling by unmanned vehicles by using MPC sensor. Explain what is MPC sensor and also is threaded how on vehicles. Made use of PID controller and LQG/LTR controller that is used much in present industrial circles for control of this.

8    Xinmin Tao, Furong Liu, Tingxian Zhou, "A novel approach to intrusion detection based on support vector data description," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2016- 2021 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A This paper presents a novel one-class classification approach to intrusion detection based support vector data description. This approach is used to separate target class data from other possible outlier class data, which are unknown to us. SVDD-intrusion detection enables determination of an arbitrary shaped region that comprises a target class of a dataset. This paper analyzes the behavior of the classifier based on parameter selection and proposes a novel way based on genetic algorithm to determine the optimal parameters. Finally some experiments are finally reported with DARPA' 99 evaluation data. The results demonstrate that the proposed method outperforms other two-class classifiers.

9    Se-Han Lee, Ki-Chang Lee, Jung-Woo Jeon, Don-Ha Hwang, Yong-Joo Kim, "A position control for a parallel stage with 6 degrees of freedom using magnetic actuators," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2022- 2027 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we address a position control scheme for a stage system, which is levitated and driven by electric magnetic actuators. This consists of a levitating object (called platen) with 4 permanent magnetic linear synchronous motors in parallel. Each motor generates vertical force for suspension against gravity and propulsion force horizontally as well. This stage can generate six degrees of freedom motion by using the vertical and horizontal forces. Dynamic equations of the stage system are derived based on Newton-Euler method and its special Jacobian matrix describing a relation between the Joint velocity and platen velocity is done. There are proposed two control schemes for positioning, which are Cartesian space controller and Joint space controller. The control performance of the Cartesian space controller is better than the Joint space controller in task space trajectory', while the Joint space controller is simpler than the Cartesian space controller in controller realization.

10    Xin min Tao, Fu rong Liu, Ting xian Zhou, "A novel approach to intrusion detection based on SVD and SVM," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2028- 2033 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a new intrusion detection methods based on singular value decomposition and support vector machine. The proposed method utilizes a new feature based on orthogonal projection coefficients obtained by singular value decomposition. The support vector machine classifier is performed on the new extracted feature vector sets. The RBF kernel parameters are optimized by the grid-search using cross-validation in this paper. Finally experiment results show that the novel intrusion detection method is effective and possesses several desirable properties when it compared with many existing methods.

11    Hongxia Yin, Zhi Wang, Youxian Sun, "A weighted fair queuing scheduling algorithm with (m, k)-firm guarantee," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2034- 2039 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Some real-time networked applications, such as video transmission, allow a few misses. To better transmit these applications with large burst size or average rate (m, k)-firm guarantee is integrated in QoS architecture. Because WFQ is one of the most popular scheduling algorithms implemented in commercial routers, a weighted fair queuing scheduling algorithm based on (m, k)-firm, (m, k)-WF/sup 2/Q, is proposed. In this paper, a fluid scheduling model, (m, k)-GPS, is proposed firstly. Then, (m, k)-WF/sup 2/Q (a packet-by-packet scheduling algorithm) is showed. Moreover, the worst-case delay bound of (m, k)-WF/sup 2/Q is derived using Network Calculus, and (m, k)-patterns appropriate to (m, k)-WF/sup 2/Q are discussed. Simulation results show that (m, k)-WF/sup 2/Q can provide lower delay than WFQ and (m, k)-WF/sup 2/Q is a fair and feasible queuing scheduling algorithm.

12    Minwon Park, In-Keun Yu, "A study on the optimal voltage for MPPT obtained by surface temperature of solar cell," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2040- 2045 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Photovoltaic(PV) system has been studied and watched with keen interest due to a clean and renewable power source. But, the output power of PV system is not only unstable but uncontrollable, because the maximum power point tracking (MPPT) of PV system is still hard with the tracking failure under the sudden fluctuation of irradiance. Authors suggest that the optimal voltage for MPPT be obtained by only solar cell temperature. Having an eye on that the optimal voltage point of solar cell is in proportion to its panel temperature, with operating the power converter whose operating point keeps its input voltage to the optimal voltage imagined by the surface's temperature of PV panel, the maximum power point becomes tenderly possible to be tracked. In order to confirm the availability of the proposed control scheme both control methods are simulated not only on the various angle of sampling time of switching control, but also with the real field weather condition. As the results of that, the conversion efficiency between PV panel and converter of the proposed control scheme was much better than that of the power comparison MPPT control, and what is better, the output voltage of PV panel was extremely in stable when the optimal voltage for MPPT is obtained by only solar cell temperature.

13    Han-Ul Yoon, Kyoung-Taik Park, Kwee-Bo Sim, "Improvement of processing time using residue number system and sorting network in controller design," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2046- 2051 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents and proposes two approaches to speed up for the controller unit. One is a residue number system (RNS), the other is a sorting network. Using an RNS reduces the total bit size of adder and carry-propagation delays. Also, using sorting network makes comparing time of 16 input data sequences within 10 clocks. First, this paper introduces the basic concept of an RNS and a sorting network. Next, we design the controller using the RNS adder and Green model 16-input sorting network. We present experimental results about elevator group control by applying these two approaches. Experimental results show that the RNS can reduce adder size, which calculates an elevator attractive function (EAF) value, to 5-bit and its carry propagation delay within a single residue. The results also demonstrate that a sorting network is able to choose the best elevator to serve against passenger's request by comparing the attractive function value of each elevator with in 4 clocks. It means that our primary goal can be achieved by these two approaches.

14    W.S. Chong, G.T. Yang, P.H. No, T.K. Kwon, C.U. Hong, N.G. Kim, "A quantitative evaluation of golf swing," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2052- 2057 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The purpose of this study was quantitatively evaluate golf swing. This was performed by comparing the physiological and kinematical factors of the experts and beginners. A system for measuring impact was built to acquire a club head trace. The results obtained showed that the club head speed of experts appeared to have values about 8.6% over that of beginners, and the speed with club3 showed was about 7.9% higher than that of a club7. In the case of beginners, an increase of club length did not cause an increase in club head speed. In terms of address time, experts were shorter by about 20.6% than beginners, but there were no significant differences among types of irons used for both experts and beginners. Dominant /spl alpha/ waves when static case mean that a golfer maintains a stable mental state, /spl beta/ and /spl beta/II waves were larger in the right hemisphere than in left, and /spl alpha/ wave are lower in the right hemisphere. During the swing, /spl beta/ and /spl beta/II waves are dominated high strong concentration, /spl alpha/ waves were dominant and /spl beta/. /spl beta/ll waves attenuated in the right hemisphere.

15    Min Ju Park, Sang Jin Lee, Dal Hwan Yoon, "Signal detection and analysis of DTMF receiver with quick Fourier transform," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2058- 2064 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The economical method for the signals detection of dual-tone multifrequency (DTMF) receiver is an important factor when developing cost-effective telecommunication equipment. Each channel of the digital switching system has independently a DTMF receiver, and it informs the detected signal to processors. The DTMF receiver uses DFT, FFT and Goertzel's algorithm for signal detection. In this work, a new method for performance evaluation and analysis for multifrequency (DTMF) receiver using QFT (quick Fourier transform) algorithm is proposed. The symmetric properties of the QFT basic function method has better performance on the less memory consumption and real time processing ability compared with conventional FFT, DFT and Goertzel algorithm in the calculation of the number of floating-point operations. As shown in the experimental results, it also demonstrates that the QFT algorithm consumes less memory and process the task at the real-time.

16    Jae Kyung Lee, Dal-Hwan Yoon, "Frequency domain multiplication-free adaptive filter with the MDFT in fast data transmission," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2065- 2070 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes the frequency domain multiplication-free adaptive filter (FDMAF) using the modified discrete Fourier transform (MDFT) pair. The proposed FDMAF employs the MDFT and differential pulse code modulation (DPCM) in an input part and the reference input vectors are used in the update equation for the adaptive filter coefficients. The FDMAF structure can remove the intersymbol interference (ISI) in fast data transmission channel, and analyses their convergence characteristics. Also, the proposed FDAF can be simply controlled by adjusting the amplitude of the MDFTP (MDFT pair) output signals and can obtain an output signal with stable convergence characteristics and without accumulated error. The FDMAF algorithm is analyzed under conditions of zero-mean, wide-sense stationary and white Gaussian noise.

17    Jin Young Kim, Jong Heon Kim, "Power amplifier linearization with adaptive predistorter for stable IMD characteristics," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2071- 2076 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, an adaptive predistortion linearizer is proposed and fabricated for a power amplifier implementation. In order to compensate for intermodulation distortion (IMD) drift of the predistorted power amplifier, an adaptive algorithm based on the LMS (least mean square) criterion is proposed. Improvement of 12.67 dB in 2-fone test and adjacent channel power ratio (ACPR) reduction of 6 dB is achieved for the IS-95 CDMA cellular system by applying the adaptive predistorter to power amplifier with an average power of 16 W. From the experimental results, the ACPR characteristics is maintained within a constant value less than -45 dBc when the outside temperature changes from -10 /spl deg/C to 50 /spl deg/C.

18    Xu Yan, Han-Jeong Lee, Jong-Seo Kim, Kang-Soo You, Dae-Jung Kim, Hoon-Sung Kwak, "The coding technique of image with multiple ROIs using standard Maxshift method," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2077- 2080 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose an improved Maxshift method in Part 1 of JPEG2000. The proposed algorithm performs compression of an image that includes one or more ROI (region of interest) according to a demand of client using Maxshift method. We evaluate the performance of the proposed method with different bit rates. As a result of simulation, it shows that the proposed method increases PSNR vs. compression ratio performance and makes possible to transmit image with multiple ROIs over low bit rates above the Maxshift method.

19    Jung-Keun Kim, Tae-Gyu Chang, Ho-Sung Kim, Min-Sik Kang, "Adaptive compensation of motional disturbances for laser Doppler vibrometer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2081- 2085 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an LDV's body vibration compensation technique which is based on the LMS adaptive processing of the auxiliary signal measured from an in-housed damper. The utilization of the in-housed damper and the adaptive signal processing significantly alleviate the problem of calibration and environmental settings for the LDV. The proposed compensation technique is implemented with the design of a prototype LDV system, assuming one dimensional body movement in the direction of measurement. To illustrate the feasibility of the technique, the operation of the designed system is tested with computer simulations as well as with experimental data actually measured from the fabricated prototype system. It is also shown that the slowly varying pattern of the environmental vibration, the assumption of which can be justified in most of practical situations, can be effectively exploited and removed from the measured signal by applying the LMS adaptive algorithm.

20    Hong Yub Lee, Il Kyu Eom, Yoo Shin Kim, "Error concealment using directional coefficient mask and difference of DC," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2086- 2091 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, an adaptive reconstruction of the lost blocks of DCT based images over unreliable channel is presented. The DCT coefficients in the lost blocks are recovered by interpolation using the available neighboring blocks that are adaptively selected using the difference of DC opposite blocks (DDC). The previous methods in the DCT domain could not yield a good quality for the edge regions because the correct estimation of direction by exploiting the DCT coefficients of correctly received neighboring blocks is difficult. Reconstruction using DDC is efficient in recovering the edge, texture and smoothness regions. And the masking of the DCT coefficient can remove unnecessary DCT coefficients. Simulation results show that the quality of the recovered image is satisfactory.

21    Hyun-Sik Kim, In-Soo Kim, Seung-Yong Chun, "Design of fuzzy interacting multiple model algorithm for maneuvering target tracking," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2092- 2097 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The IMM based tracking algorithm requires the many number of sub-models in order to have a good performance with respect to the various target maneuvering. But it is not reasonable to use the algorithm, which has more computing resource, in real system application. Therefore, we need the algorithm which has less computing resource as well as good performance. To solve this problem, we propose a fuzzy interacting multiple model algorithm (FIMMA) for a maneuvering target tracking, which use the minimum number of sub-models by considering the maneuvering property and adjust the mode transition probabilities by using the mode probability as a fuzzy input. To verify the performance of FIMMA, the airborne target tracking is performed. Simulation results show that the FIMMA is very effective in the maneuvering target tracking.

22    H. Hashimoto, N. Hino, Y. Ohyama, M. Niitsuma, C. Ishii, "Positioning control of the finger tip drive type of linear stage using disturbance observer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2098- 2103 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper purposes to improve accuracy of positioning control within nano-scale of the linear stage made of fine-ceramics. In this control, the disturbance as the vibration of the tip and the friction transition between the tips and the guide causes the position vibration of the stage, and then the position error is increased. Positioning control of the linear stage is examined by two control strategies, i.e., a PID control (PID type) and a PID control with the disturbance observer (PID+DO type). Comparing the experimental results, it is found that the position error of PID+DO type is less than that of PID type. The considerations in the comparison for the experimental data are shown.

23    Xuemei Zhu, Shuqing Wang, "Development of soft sensor system via dynamic optimization," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2104- 2109 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In chemical process industry, some variables are difficult to measure on-line due to the limitation of measurement techniques, reliability or high cost to install a hard sensor. Some measurable variables, such as product quality, cannot be used for real-time optimization and control due to the large time delay. The soft-sensing of these variables is considered as an efficient method, and remains as an open problem. A new soft sensor system is developed to solve these problems in this work, which is based on rigorous model by using dynamic optimization to minimize the bias square between the model outputs and the measured outputs. Compared with other soft sensor systems, the proposed soft sensor system accurately employs the nonlinear model and considers the constraints in the optimization. It not only is more efficient in economic but also can be used on-line for real-time optimisation and control. The soft sensor system is successfully applied to estimation of the feed composition of a pilot heat-integrated distillation column system.

24    Kyung-Rae Cho, Jul-Ki Seok, Dong-Choon Lee, "Applications of mechanical parameter identification with support vector machine for AC motor control system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2110- 2115 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The overall performance of AC servo system is greatly affected by the uncertainties of unpredictable mechanical parameter variations and external load disturbances. Therefore, to compensate this problem, it is necessary to know different parameters and load disturbances subjected to position/speed control. This paper proposes an online identification method of mechanical parameters/load disturbances for AC servo system using support vector regression (SVR). The proposed methodology advocates analytic parameter regression directly from the training data, rather than adaptive controller and observer approaches commonly used in motion control applications. The experimental results demonstrate that the proposed SVR algorithm is appropriate for control of unknown servo systems even with large measurement noise.

25    Seung Su Kye, Dal Hwan Yoon, "Spectral analysis and performance evaluation of a small ceramic PECL VCXO," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2116- 2121 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we have developed the voltage controlled crystal oscillator (VCXO) with positive emitter coupled logic (PECL) and the test Jig system. The characteristics of the PECL package have the delay time less than 2 ns and the faster logic gate. When we evaluate the performance of PECL VCXO, there are the stray inductance and the capacitance brought from the VCXO with the PECL package. So it is necessary the Jig system that can cancel these factors to measure the precise performance.

26    Hyungwoo Lee, Juho Kim, "Accurate static timing analysis considering crosstalk noise effect," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2122- 2125 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Coupled line switching can contribute to a large portion of the delay as well as the functionality of a circuit. In order to fix a crosstalk noise in noise analysis, it is necessary an additional design cost. Therefore, aggressor nodes that cannot affect victim node have to pruning. In this paper, we present an efficient false aggressor pruning algorithm with functional correlation. Path sensitization algorithm and logic implication approach that use functional information to identify false coupling interaction between coupled lines. Our experimental results show an average of 5.4% aggressor pruning and 14.6% delay reduction due to pruning.

27    Hyungwoo Lee, Hakgun Shin, Juho Kim, "Glitch elimination by gate freezing, gate sizing and buffer insertion for low power optimization circuit," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2126- 2131 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: One of the major factors contributing to the power dissipation in CMOS digital circuits is the switching activity. Many of such switching activities include spurious pulses, called glitches. In this paper, we propose a new method of glitch reduction by gate freezing, gate sizing, and buffer insertion. The proposed method unifies gate freezing, gate sizing, and buffer insertion into a single optimization process to maximize the glitch reduction. The effectiveness of our method is verified experimentally using LGSynth91 benchmark circuits with a 0.5/sup um/ standard cell library. Our optimization method reduces glitches by 65.64% and the power by 31.03% on average.

28    K.W. Lee, J.W. Park, Y.A. Kwon, "Research of speed ripple reduction method for computed tomography," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2132- 2136 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a study on the high performance speed control of permanent magnet synchronous motor for a computed tomography (CT). In a CT system, many units are attached on the rotational part of the gantry, such as x-ray tube, detector, collimator, and data acquisition system. Therefore, it is difficult to balance many components of different weights; this is inevitable problem in CT systems. To reduce speed ripple caused by eccentricity, this study proposed modified adaptive eccentricity compensator (modified AEC) and verified its validity by comparing it with load torque observer (LTO).

29    Ki-Chang Lee, jeong-Woo Jeon, Don-Ha Hwang, Se-Han Lee, Yong-Joo Kim, "Development of antilock braking controller using hardware in-the-loop simulation and field test," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2137- 2141 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the control principles and algorithms for the antilock brake system (ABS) with pneumatic brake. Also a new simulation method, the hardware in-the-loop simulation (HILS), which includes hardware in the control and simulation loop, is presented. It includes pneumatic brake hardware between the controller input and simulated vehicle dynamics output. How to construct the HILS for antilock brake system of a vehicle is described. Also how to evaluate the antilock brake algorithms and electronic control unit (ECU) in laboratory is explained. If the HILS is used, functional tests of the newly developed antilock brake controller can be made in a short time using repeated experiments. As a result, times and costs needed for developing the new antilock brake controller can be reduced. Also the developed controller was equipped in a real vehicles and tested in the real test road for comparison. It can be said that the HILS is a good method for developing a new system especially in automotive applications, in which many trial and errors are required for practical implementation.

30    Byung-Jae Jung, Jung-Shik Kong, Bo-Hee Lee, Sang-Min Ahn, Jin-Geol Kim, "Backlash compensation for a humanoid robot using disturbance observer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2142- 2147 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the control of a geared DC motor having a backlash for implementation of a humanoid robot using disturbance observer. Critical problem of the humanoid robot is caused by the nonlinearity such as a backlash. To meet this problem, a control method using disturbance observer has been proposed. The disturbance observer is designed to estimate the effects of nonlinearities in the system, to make the nonlinear system behave linearly, and to cancel them efficiently. To design the low-pass filter in the disturbance observer, cut-off frequency of the output should be found. The goal of this paper is the implementation of the proposed system, compensating the backlash effect. To accomplish the goal, PD control and disturbance observer are employed to the system with no load and full load. As a result, system stability can be guaranteed by compensating the effect of backlash. In addition, real experiment shows the proposed control methodology will satisfy the stable working of a humanoid type in the future.

31    B. Akin, U. Orguner, A. Ersak, M. Ehsani, "A comparative study on non-linear state estimators applied to sensorless AC drives: MRAS and Kalman filter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2148- 2153 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filtering techniques (EKF and UKF) and model reference adaptive system (back emf and reactive power models), are discussed and compared to each other. Both of the observer types are studied and analyzed both experimentally and theoretically. In order to compare the observers precisely, the observers are tested under the identical conditions.

32    T. Funasaka, M. Iwase, S. Hatakeyama, "3D visualization of region of stabilization for nonlinear systems using FPGA," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2154- 2158 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The stabilization of nonlinear systems depends strongly on the initial state and the parameters of the systems. The initial state and the parameters with which the system is stabilized can be distinguished by the geometrical structure. It is, however, difficult and sometimes impossible to analyze the structure analytically. Therefore it comes important to show and analyze the structure of the parameters and initial states numerically and visually. In this paper, we present a method to draw and visualize such region and structure in the three dimensional space. In general, the projection of the original high-dimensional space to the lower dimension one is required for using visual analysis. Thus, it is convenient that the viewpoint can be moved, without time loss, in the direction where analyst would like to see. As often as the viewpoint moves, the recomputation as quick as possible is required to realize the quick motion of viewpoint. It is, however, obvious that lots of computation and time are taken to draw the region. Therefore, high performance calculators are needed to realize the real-time drawing. In order to overcome this problem, FPGA is used in this paper. Then it is demonstrated by illustrative examples that FPGA shows high performance lo draw the region of the parameters and initial state in 3D with which Z/sub n+1/=Z/sub n//sup 2/+C can be stabilized, that is Mandelbrot and Julia sets, respectively.

33    Sohee Han, Byungsun Cho, Sung-Han Son, Kang-Bak Park, T. Tsuji, "Sliding mode controller with nonlinear sliding surface for a second order system with input saturation," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2159- 2162 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a sliding mode controller for a second order system with input saturation is proposed. The proposed method uses a nonlinear sliding surface to ensure that the control signal generated by the controller does not exceed the bounds of a system input.

34    K. Zhang, M. Nagamatu, "Solving SAT by parallel execution of neural networks with probabilistic attenuation coefficient generator," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2163- 2167 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We have proposed a neural network named LPPH for the SAT. In order to solve the SAT more efficiently, a parallel execution has been proposed. Experimental results show that higher ratio of speedup is obtained by using this parallel execution of the LPPH. There is an important parameter named attenuation coefficient in the dynamics of the LPPH, which affects strongly the speed of execution of the LPPH. In this paper, a method is proposed to generate attenuation coefficients for the dynamics of the LPPH by using probabilistic generating function. The experimental results show that this method is efficient.

35    Zhonggai Zhao, Fei Liu, "Industrial monitoring based on moving average PCA and neural network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2168- 2171 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For industrial process monitoring, instead of conventional principal component analysis (PCA), dynamic principal component analysis (DPCA) is a powerful tool to deal with dynamic relationship among process variable series. Similar to PCA, conventional DPCA methods are not suitable for many industry processes with variables containing nonlinear relationship. Neural networks possess the ability to approximate any nonlinear functions, it have been used is to capture the nonlinear function in DPCA. However, it often needs too many nodes in its layers. It is known that moving average techniques can capture time-dependent without adding the dimensionality of raw data set. Along the line, a method of industrial monitoring discussed in this paper combines moving average PCA (MAPCA) and neural network. As an application case, industrial chemical separation process is used to illustrate the method.

36    Hyeon Bae, Dae-Won Choi, Seng-Tai Lee, Yejin Kim, Sungshin Kim, "Application of data mining and artificial modeling for coagulant dosage of water treatment plants corresponding to water quality," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2172- 2177 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Shortage of water is gradually accelerated because a high standard of living is required and water resources are rapidly run dry. Therefore, effective water treatment is necessary to retain the required quality and amount of water. The general treatment includes coagulation, flocculation, filtering, and disinfections. Coagulation, flocculation, and disinfections are major parts of the water treatment processes. In this paper, new automatic algorithm is proposed for coagulation that is one of the water treatment processes. The proposed method is showing how to determine the coagulant soil and amounts using data mining techniques.

37    Chuanyu Xu, "OWA operator of linguistic label vague set and its application," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2178- 2181 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper forwards an ordered weighted average (OWA) operator of linguistic label vague (LLV) set. The OWA operator evaluates the degrees to which the object described by linguistic label vague set satisfies, docs not satisfy and does not know whether it satisfies or not most individuals of universe. Secondly, it converts the vague value expressed by triangular fuzzy numbers (TFNs) into the ordinary vague value. Thirdly, it uses the score function of LLV set to measure the suitable degree of the object described by LLV set, and takes the score as an index for sorting. Lastly, it applies the OWA operator of LLV to our simulation example of decision making. The result shows the efficiency of OWA operator of LLV set.

38    Gi-Hyun Hwang, June Ho Park, Kyeong-Jun Mun, Hyeon Tae Kang, "Design of fuzzy logic controller for firing angle of TCSC using real-type tabu search," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2182- 2187 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the application of fuzzy logic controller (FLC) to thyristor controlled series capacitor (TCSC) which can have significant impact on power system dynamics. The function of the FLC is to control the firing angle of the TCSC. We tune the scaling factors of the FLC using real-type tabu search (RTS). The proposed FLC is used for damping the low frequency oscillations caused by disturbances such as the sudden changes of small or large loads or the outages in the generators or transmission lines. To evaluate the usefulness of the proposed FLC, we perform the computer simulation for single-machine infinite system. The response of FLC is compared with that of PD controller optimized using real-type tabu search. The simulation results that the FLC shows the better control performance than PD controller.

39    Yijian Liu, Xuemei Zhu, Jianming Zhang, Shuqing Wang, "Application of particle swarm optimization algorithm for weighted fuzzy rule-based system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2188- 2191 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The particle swarm optimization (PSO) algorithm is an evolutional optimization method. Some of the attractive features of the PSO algorithm include its easy implementation and the fact that no gradient information is required. In this paper, a weighted fuzzy rule-based system has been designed, in which the parameters of membership functions including position and shape of the fuzzy rule set and weights of rules are estimated using the PSO algorithm. The efficiency of the system has been illustrated in the process of classifying the iris data. This paper also shows that weighted fuzzy rules can lead to better fuzzy system compared with non-weighted fuzzy rules.

40    Wei Jian, Yuncan Xue, Jixin Qian, "Improved particle swarm optimization algorithms study based on the neighborhoods topologies," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2192- 2196 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A study of neighborhoods topologies on particle swarm optimization for complex functions is discussed. The suitability of three topologies to the kind of functions is experimented. The convergence features affected by neighborhoods topologies on complex functions are illustrated. To prevent premature phenomenon of the original algorithm, an improved particle swarm optimization algorithm with velocity and position disturbances is used. Simulations have been carried and the results show this improved algorithm has batter performance for complex functions.

41    Yuncan Xue, Xinnan Fan, Wei Jian, "Improved particle swarm optimization algorithm for integrated steel-making optimum charge plan," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2197- 2200 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An optimum furnace charge plan model for steelmaking continuous casting planning and scheduling is presented. An improved particle swarm optimization is presented to solve the optimum charge plan problem. Simulations have been carried and the results show that the improved PSO has good performance than the standard PSO. This improved PSO has been used to solve the optimum charge plan problem. The computation with practical data shows that the model and the solving method are very effective.

42    Chan-Hee Lee, Soon-Ho Jung, "Fast thinning algorithm based on improved SOG (SOG*)," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2201- 2206 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We propose improved self-organized graph (improved SOG: SOG ) thinning method, which maintains excellent thinning results of self-organized graph (SOG) built from self-organizing features map and improves the performance of the existing SOG by using a new incremental learning method of Kohonen features map. In the experiments, this method shows the thinning results to be equal to those of SOG but the time complexity O((logM)/sup 3/) to be superior to that of SOG. Therefore, the proposed method is useful for the feature extraction from digits and characters in the preprocessing step.

43    Li Jinhou, Jiang Jingping, "Is logical omniscience problem there or not: a critical view," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2207- 2212 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Logical omniscience is usually thought as a big problem faced by standard modal or epistemic logic study, or its application in areas like distributed artificial intelligence research. However, by arguing with the question how or under what senses it's raised as a problem, we find this problem is just declared unclearly, or even improperly. That is, in some sense, it's just a problem given by some scholars fundamental-confusedly and so invalidly. Hence, if there's some problem there, it must be some problem else, but definitely not that logical omniscience problem, because there are no proper grounds for us to declare this problem upon.

44    Soo-Yeon Lim, Mu-Hee Song, Ki-Jun Son, Sang-Jo Lee, "Domain ontology construction based on semantic relation information of terminology," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2213- 2217 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Ontology is an explicit specification of a conceptualization. That is, ontology is a description of the concepts and relationships that can exist for an agent or a community of agents. This study suggests a method of constructing domain ontology using terminology processing and applies the method to document retrieval. In order to construct ontology, if proposes an algorithm that classifies the patients of nouns and suffices which compose terminology, in domain texts, extracts terminology, and build a hierarchical structure. The experiment used documents related to pharmacy, and the algorithm showed accuracy of 92.57% for singleton terms and 66.64% for multi-word terms on the average. Constructed ontology, which forms natural groups of senses centering on specific nouns or suffices composing the terminology with semantic information, can be utilized in approaching the knowledge of special areas such as document retrieval. According to the result of document retrieval based on the constructed ontology, the system improved in precision and recall compared to traditional keyword-based document retrieval.

45    Chunhan Lee, Yushin Chang, Gunhong Park, Jaeheon Ryu, Seung-Gweon Jeong, Seokhyun Park, Jae Whe Park, Hee Chang Lee, Keum-shik Hong, Man Hyung Lee, "Indoor positioning system based on incident angles of infrared emitters," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2218- 2222 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new indoor positioning system based on incident angle measurement of infrared lights has been suggested. Though there have been various researches on indoor positioning methods using vision sensor or ultrasonic sensor, they have not only advantages, but also disadvantages. To minimize the disadvantages they have, this new method using incident angle of infrared light has been invented. In a new positioning system, there are three infrared emitters on fixed known positions. An incident angle sensor measures the angle differences between each two emitters. Measured angle differences determine a position. This method is available only inside the triangle which is composed of three emitters. Mathematical problems to determine the position with angle differences and position information of emitters has been solved. To solve the non-linear equations without prior position information, iterative linearization process has been used. Simulations and experiments have been implemented to show the performance of this new positioning system. The results of simulation were good. Since there existed problems of noise and signal conditioning, the experimented has been implemented in limited area. But the results were acceptable. This new positioning method can be applied to any indoor systems that need absolute position informations.

46    Min Gyu Park, Min Cheol Lee, "Real-time path planning in unknown environment and a virtual hill concept to escape local minima," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2223- 2228 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The artificial potential field based path planning has been most wisely used for local path planning because it provides simple and efficient motion planners for practical purposes. However, this approach has a local minimum problem which can trap a robot before reaching its goal. The local minimum problem is sometimes inevitable when a mobile robot moves in unknown environments, because the robot cannot predict local minima before it detects obstacles forming the local minima. The avoidance of local minima has been an active research topic in the potential field based path planning. In this study, we propose a new concept using a virtual hill to escape local minima that occur in local path planning for a mobile robot. A virtual hill is located around local minimum to repel a robot from local minimum.

47    Dae-Wook Kim, Jae-Won Yang, Kwee-Bo Sim, "Adaptive intrusion detection algorithm based on learning algorithm," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2229- 2233 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Signature based intrusion detection system (IDS), having stored rules for detecting intrusions at the library, judges whether new inputs are intrusion or not by matching them with the new inputs. However their policy has two restrictions generally. First, when they couldn't make rules against new intrusions, false negative (FN) errors may are taken place. Second, when they made a lot of rules for maintaining diversification, the amount of resources grows larger proportional to their amount. In this paper, we propose the learning algorithm which can evolve the competent of anomaly detectors having the ability to detect anomalous attacks by genetic algorithm. The anomaly detectors are the population be composed of by following the negative selection procedure of the biological immune system. To show the effectiveness of proposed system, we apply the learning algorithm to the artificial network environment, which is a computer security system.

48    Sung-su Kim, Tae In Kim, Keun Sang Jang, Seul Jung, Sung Su Kim, "Control experiment of a wheeled drive mobile pendulum using neural network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2234- 2239 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, control of a wheeled drive mobile pendulum system is presented. The inverted pendulum mounted on the wheeled drive mobile robot is controlled by neural network. Neural network learning algorithm is embedded on a DSP board and controls the angle of the pendulum and the position of the mobile robot along with PID controllers. Uncertainties in system dynamics are compensated by neural network in on-line fashion. Experimental results show that the performance of balancing of the pendulum and position tracking of the mobile robot is successful.

49    Young Im Cho, Yoo Shin Kim, "Development of an intelligent agent system modeling," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2240- 2245 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: It is a complex and repeated procedure to search some appropriate information. Moreover, because the user's interests are changed as time goes, the real time modeling of a user's interests should be necessary. In this paper, we propose IREA system that can search and filter documents that users are interested from the Web. And then it constructs the user's interest model by a modified spreading neural network. Based on this network. IREA can easily produce some queries to search Web documents, and it ranks them. The conventional spreading neural network doesn't have a visualization function, so that the users couldn't know how to be configured his or her interest model by the network. To solve this problem, IREA gives a visualization function being shown how to be made his interest user model to many users.

50    Somyot Kaitwanidvilai, Manukid Parnichkun, "Position control of a pneumatic servo system by genetic algorithm based fixed-structure robust H/sub /spl infin// loop shaping control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2246- 2251 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Robust controller designed by the conventional H/sub /spl infin// optimal control is complicated and high order. It is not easy to implement this controller in practical works. In industrial applications, simple structure such as lead-lag compensator and PID are widely used, because of their simple structure, less number of tuning parameters, and lower order. However, tuning of these control's parameters to achieve a good performance and robustness is difficult. To solve this problem, we propose an algorithm, a genetic algorithm based fixed-structure robust H/sub /spl infin// loop shaping control, to design the robust controller. Infinity norm of transfer function from disturbance to output is subjected to be minimized via searching and evolutionary computation. The resulted optimal parameters make the system stable and also guarantee robust performance. We applied the evolutionary robust controller to a pneumatic servo system. For performances comparison, three controllers; PID with derivative first order filter controller, PI controller and H/sub /spl infin// loop shaping controller are investigated. Several advantages of simple structure, robustness against parameters changing is clearly shown in experimental results. Simulations are also done to prove the effectiveness of the proposed technique.

51    Dae-Young Lim, Young-Jae Ryoo, "Development of remote monitoring system for cold-storage," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2252- 2254 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a remote monitoring system of temperature control for cold-storage of farm produce. In cold-storage, it is important that farm produces are stored as fresh. Unfortunately, when an operator goes out from the cold-storage, the temperature could be changed due to the various reasons, for an example, a valve of cooler is broken. The temperature change results in a serious problem of the quality of farm produce. To prevent the problem, the operator has to look to the current state of the temperature of the cold-storage, even he is in long away. Thus, the monitoring system to show the temperature is required to the operator who can move away. Therefore, this paper describes the remote monitoring system of the temperature. The proposed system is expected to help the operator's facilities, and the management of farm produce.

52    Rong-Chyang Lee, Ching-Ming Lai, Wen-June Wang, "Using on-line estimation techniques for output feedback VSC design," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2255- 2259 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The conventional VSS is always limited to the system with full-state feedback, however in practical applications, full measurement of state might be neither possible nor feasible. To deal with the unavailability of state, some asymptotic observers and dynamic compensators have been used in VSS (variable structure system) recently. However, those methods possibly increase the complexity of system. On the other hand, in conventional VSS design, the knowledge of the upperbound of uncertainty is required to determine the gain of control. In general, this may not be easy to obtain. Then, the on-line estimation technique relaxed from the point that no knowledge of uncertainty upperbound is needed. In this paper, a direct output feedback variable structure control is proposed with an on-line estimation technique to stabilize a class of nonlinearly uncertain systems robustly. Here the hyperplane is composed of the output instead of the state, and the estimation uses the time delay concept to evaluate a function which represents the effects of the inaccessible state and uncertainty, under which the output feedback design is completed.

53    L. Zhao, C.H. Ham, Q. Han, T.X. Wu, L. Zheng, K.B. Sundaram, J. Kapat, L. Chow, "Design of an optimal V/f control for a super high speed permanent magnet synchronous motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2260- 2263 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new design approach of an optimal V/f control for a super high speed permanent magnet synchronous motor (PMSM) is presented. The stator resistance of PMSM is generally neglected in design of a V/f control and compensated only by a boost voltage. However, due to the extra small size requirement of the proposed super high speed PMSM, stator resistance cannot be neglected any more. In this paper, the optimal design of a V/f control curve with consideration of the stator resistance is provided. The effect of the stator resistor to the V/f control curve is analyzed, it enables utilization of a simple and easy V/f control curve for an open-loop control of the super high speed PMSM. Simulation results are illustrated to show the effectiveness of the proposed design technique.

54    Sung-Han Son, Kang-Bak Park, "Discretization behaviors of equivalent control based sliding-mode control systems with external disturbances," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2264- 2268 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we study discretization behaviors of the equivalent control based sliding-mode control (SMC) systems. According to the variation of system parameters, the inherent dynamical behavior of the trajectories within some specified boundaries are discussed. Also upper bounds for the system steady states using symbolic dynamics approach are established. Some dynamical properties of the discretized second-order systems under the existence of uncertainties and disturbances are first explored. This paper include upper bounds for this system's steady states and steady state behaviors, which has not been addressed before. Simulations are presented to verify the theoretical results.

55    Cui Jiefan, Wang Chengyuan, Yang Junyou, Yu Dongbo, "Research on force and direct thrust control for a permanent magnet synchronous linear motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2269- 2272 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Magnetic field of a permanent magnet synchronous linear motor (PMSLM) has been analyzed at first. Then thrust force has been taken into account completely in the paper. Experiment results are coincident with calculation of finite element method. It is obviously observed undulate force, which has effect on force control in drive system. Direct torque control has prominence characteristic of fast response. Simulation analysis for the prototype shows that the control schema can be applied in linear motor driving and the undulate force can be controlled effectively by suitable strategy even complex magnetic field distribution and particular end-effect.

56    M. Jasinski, M.P. Kazmierkowski, "Sensorless direct power and torque control of PWM back-to-back converter-fed induction motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2273- 2278 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel control scheme for PWM rectifier-inverter system is proposed. Fast control strategies such as line voltage sensorless virtual flux (VF) based direct power control with space vector modulator (DPC-SVM) for PWM rectifier and direct torque control with space vector modulator (DTC-SVM) for PWM inverter side are used. These strategies lead to good dynamic and static behaviors of the proposed control system-direct power and torque control-space vector modulated (DPT-SVM). Simulations and experiment results obtained show good performances of the proposed system. Additional power feedforward loop from a motor to PWM rectifier control side improved dynamic behaviors of the power flow control. As a result, better input-output energy matching allows decreasing the size of the DC-link capacitor.

57    Chih-Hong Lin, S.J. Chiang, Tzann-Shin Lee, "Adaptive H/sub /spl infin// recurrent fuzzy neural network control for synchronous reluctance motor drive," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2279- 2284 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An adaptive H/sub /spl infin// control system which being composed of robust controller with H/sub /spl infin// attenuation technique, recurrent fuzzy neural network (RFNN) and compensated control with adaptive law is proposed to control the rotor of a synchronous reluctance motor (SynRM) for the position tracking. First, the field-oriented mechanism is applied to formulate the dynamic equation of the SynRM servo drive. Then, the robust performance control problem is formulated as a nonlinear H/sub /spl infin// problem under the influence of uncertainties. Moreover, the adaptation of the RFNN is to approximate the requirement for the bound of lumped uncertainty, and a compensated controller with adaptive law is investigated to compensate the minimum approximation error. Finally, experimental results are provided to demonstrate the effectiveness of the proposed control schemes.

58    L.G. Franquelo, M.M. Prats, R. Portillo, J.I. Leon, M. Perales, J.M. Carrasco, E. Galvan, J.L. Mora, "Simple and advanced three dimensional space vector modulation algorithm for four-leg multilevel converters topology," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2285- 2289 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel three-dimensional space vector algorithm for four-legs multilevel converters is presented. It can be applied to active power filters or neutral current compensator applications for compensating harmonics and zero sequence using natural coordinates. This technique greatly simplifies the selection of the 3-D space where a given voltage vector is supposed to be found. The algorithm drastically reduces the algorithm complexity and the calculations of the active vectors with the corresponding switching time which generate the reference voltage vector. In addition, the low computational cost of the proposed algorithm is always the same and it is independent of the number of levels of the converter.

59    Alian Chen, Lei Hu, Xiangning He, "A novel type of combined multilevel converter topologies," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2290- 2294 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A novel type of combined multilevel converters is discussed, combining the conventional diode clamped or flying capacitor multilevel converters with two-level bridge legs. Compared with the conventional multilevel converters, this novel type requires much fewer clamping diodes and flying capacitors at the same number of output voltage levels. So the reliability of the circuit is improved and costs are reduced. The construction rule and modulation method of these topologies are presented in the paper. To confirm the validity of the new topologies, a combined diode clamped seven-level half-bridge inverter and a combined flying capacitor five-level half-bridge inverter are taken as examples for simulations and experiments, and the results proved the validity.

60    M. Hamouda, F. Fnaiech, K. Al-Haddad, H.Y. Kanaan, "Matrix converter control: a sliding mode approach," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2295- 2300 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new state-space modeling of a three-phase AC/AC matrix converter is presented. The main objective of this paper is the design of a sliding mode controller for both controlling the output voltage and input current. The sliding mode strategy is based on the determination of the sliding surfaces and switching laws allowing to choose an appropriate space vector pattern. Robustness regarding line voltage and load parameters variations of this control technique has been recorded by using simulation results on matlab.

61    Hong-Hee Lee, Minh-Hoang Nguyen, "Matrix converter fed induction motor using a new modified direct torque control method," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2301- 2306 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a new control strategy to improve efficiency, robustness and dynamic response for the matrix converter fed induction motor with direct torque control method. Using the proposed method, besides the advantages of direct torque control method with matrix converter, the more advance of this proposed method as compared with the conventional direct torque control of matrix converter fed induction motor is the capability of reduction of both flux ripple and torque ripple within their boundaries. Numerical simulation results are given to verify the effectiveness of this new proposed method.

62    Jin-Yong Bae, Yong Kim, Soo-Hyun Baek, Geun-Soo Choi, Eun-Young Lee, Kyu-Hoon Lee, "A study on the comparison methods for a three-level converter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2307- 2313 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a coupled inductor-based rectifier of a three-level (TL) DC/DC converter and compares the rectification methods of a TL converter. The CICDR-TL (coupled inductor current doubler rectifier three-level) converter achieves ZVS (zero voltage switching) for the switches in a wide load range. CDR (current doubler rectifier) and CICDR three-level converter have low voltage and current ripple. Advantages and disadvantages of topology compared to the rectifier of bridge, center-tap, CDR, and CICDR are discussed. Experimental estimation results obtained on a 27 V, 60 A DC/DC TL converter prototype for the 1.8 kW, 40 kHz IGBT based experimental circuit.

63    Jin-Yong Bae, Yong Kim, Dong-Hyun Lee, Soon-Do Kwon, Pill-Soo Kim, Dae-Hee Han, "A study on the loss model and characteristic comparison of three-level converter and full-bridge converter through the conduction loss analysis of power devices," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2314- 2320 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the loss model and characteristic comparison of a three-level converter and a full-bridge converter through the conduction loss analysis of power devices. It shows the main reason of efficiency diminution, comparing of a full-bridge converter with a three-level converter. Also, the loss analysis of each component and the various losses in the circuit are proposed in this paper. The result of the analysis is verified with 2.5 kW prototype.

64    K. Natori, T. Tsuji, K. Ohnishi, A. Hace, K. Jezernik, "Robust bilateral control with Internet communication," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2321- 2326 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Smith predictor is a well-known method for compensating time delay in control systems. Therefore, it has been applied to many systems with time delay so far. However, delay time should be estimated precisely in this method. So, if time delay is fluctuant and unpredictable, like the communication delay over the Internet, performance of Smith predictor deteriorates. This paper proposes "Communication Disturbance Observer". It regards the error caused by time delay as disturbance torque (or acceleration), then it can observe and compensate the error. Furthermore, it doesn't need to estimate the value of delay time; therefore it can be applied to control systems with fluctuant and unpredictable time delay. It can be said that control system with "Communication Disturbance Observer" is robust to time delay and fluctuation of that. Effectiveness and robustness of proposed method is shown by result of simulation and experiment. In experiment, master-slave manipulator was used over the Internet. We were able to get the sense of touch from the environment of remote site.

65    Suk Lee, Kyung Chang Lee, Hyun Hee Kim, "Maximum communication delay of a real-time industrial switched Ethernet with multiple switching hubs," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2327- 2332 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The industrial network, often referred to as fieldbus, becomes an indispensable component for intelligent manufacturing systems. Thus, in order to satisfy the real-time requirements of field devices such as sensors, actuators, and controllers, numerous fieldbus protocols have been developed. But, the application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multi-vendor products. As an alternative to fieldbus, the Ethernet (IEEE 802.3) technology is being adapted to the industrial environment. However, the crucial technical obstacle of Ethernet is its non-deterministic behavior that cannot satisfy the real-time requirements. Recently, the switched Ethernet becomes a very promising alternative for real-time industrial application due to the elimination of uncertainties in Ethernet. This paper focuses on the application of the switched Ethernet with multiple levels (that is, cascade structure with multiple switching hubs) for real-time industrial networking. More specifically, this paper presents an analytical performance evaluation of the switched Ethernet with multiple levels from timing diagram analysis, and experimental evaluation from an experimental testbed of networked control system.

66    R. Vanijjirattikhan, M.-Y. Chow, Yodyium Tipsuwan, "Feedback preprocessed unmanned ground vehicle network-based controller characterization," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2333- 2338 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper characterizes the performance of a feedback preprocessor (FP) that is used to alleviate the effect of the delay time on an unmanned ground vehicle (UGV) path tracking problem in network-based control (NBC) environment. The FP estimates the UGV state in order to compensate for the effect of a constant time delay induced by the network. The FP technique can be implemented as an external module appending to an existing nonlinear control system without having to redesign the controller. This technique uses the plant dynamics to estimate the future state of the plant under network-based control. The overall NBC system performance is investigated via simulation in terms of UGV system dynamics responses and network time delay magnitudes. The approach and result in this paper can be used to estimate the performance of any similar UGV operating in an NBC environment. An intermediate parameter, UGV response time, may be used to relate the result in this paper to other UGV in general.

67    M. Long, C.-H.J. Wu, J.Y. Hung, J.D. Irwin, "Mitigating performance degradation of network-based control systems under denial of service attacks," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2339- 2342 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: One obstacle for the widespread deployment of network-based control systems (NBCS) is the stochastic delay induced by the underlying shared and open networks. Denial of service (DoS) attacks cause significant disruptions to the Internet, compounding the delay jitter and loss of packets that are used to transmit sensor measurements and control signals. Existing works have mainly focused on controller design under network normal operation, which might be inadequate to the threats of DoS attacks. In this paper, the authors present two mitigation measures from the viewpoint of network intrusion detection and response. The basic idea is that the routers close to the attack sources actively drop the attack traffic or lower-priority traffic to protect the resource for the legitimate application traffic. The simulation results indicate that the proposed defense measures are effective for ameliorating the NBCS performance degradation. We suggest that a plausible direction for the security of NBCS may combine the proposed network defense measures with specific controller design to compensate for delay jitter/packet loss.

68    M. Velasco, J.M. Fuertes, C. Lin, P. Marti, S. Brandt, "A control approach to bandwidth management in networked control systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2343- 2348 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Bandwidth allocation techniques for control loops closed over communication networks are based on static strategies that ensure average control performance at the expense of permanently occupying the available bandwidth. We present a dynamic approach to bandwidth management in networked control systems that allows control loops to consume band-width according to the dynamics of the controlled process while attempting to optimize overall control performance. By augmenting the original state-space representation of each controlled process with a new state variable that describes the network dynamics, 1) the allocation of bandwidth lo control loops can he done locally at run-time according to the state of each controlled process without causing overload situations and 2) control laws can be designed to account for the variations in the assigned bandwidth preventing the unexpected control performance degradation and even destabilization that would otherwise occur. Experimental data shows that this approach improves control performance with respect to the static strategy and uses less bandwidth.

69    C. Hudson, N.S. Lobo, R. Krishnan, "Sensorless control of single switch based switched reluctance motor drive using neural network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2349- 2354 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Neural networks (NNs) have proved to be useful in approximating non-linear systems and in many applications including motion control. Hitherto NNs advocated in switched reluctance motor (SRM) control have a large number of neurons in the hidden layer. This has impeded their real time implementation with DSPs at high speeds because of the high number of operations required by the NN controller and insufficiency of available time between two sampling intervals for computation and control. One of the ideal applications of NNs in SRM control is in rotor position estimation using only SRM current and or voltage signals. Elimination of rotor position sensors is absolutely required for high volume, high speed and low cost applications of SRM, say, in home appliances such as in vacuum cleaners. In this paper, through simulation and analysis, it is derived and demonstrated that a minimal NN configuration is attainable to implement rotor position estimation in SRM drives. The neural network was trained and implemented with an inexpensive DSP microcontroller for performance evaluation. Neural network training data, current i, and flux-linkage /spl lambda/, has been obtained directly from the system during its operation and was verified using finite element analysis (FEA) tools. Further the chosen method is implemented on a single switch converter driven SRM with two phases. This configuration of the motor drive is chosen because it is believed that this is the lowest cost variable speed machine system available. The theoretical results are correlated experimentally with this converter and machine configuration in order to demonstrate the viability of the proposed approach for the development of low cost motor drives.

70    P. Chancharoensook, M.F. Rahman, "A high-precision speed control of a four-phase switched reluctance motor drive using closed-loop controllers of instantaneous torque and current," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2355- 2360 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an investigation on a high-performance speed control of a switched reluctance motor in digital signal processor real-time control environment. The fully digital control consists of an inner loop of PI+PWM current control, a PI torque loop controller and an outer PI speed loop controller. The nonlinear instantaneous torque was estimated on-line from a pre-stored look-up table of measured static torque, where phase current and rotor position were the input parameters. The experimental results have shown good step speed responses, good speed tracking ability, and fast responses to load application and load removal.

71    Do-Hyun Jang, "Novel SRM converter connected to the voltage source inverter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2361- 2366 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper the novel converter topology for the switched reluctance motor drives is proposed, which is composed of the minimum switch per phase and AC voltage source. The proposed topology is connected to the single-phase voltage inverter to obtain the AC voltage source. The proposed converter topology is divided into two types according to the voltage source inverter of half bridge type and full bridge type. Proposed converters of two types are proposed, analyzed and compared with each other. The SRM using proposed converter maintain the high efficiency though the power switches are reduced. Motor torque can be controlled by adjusting the current at inverter part. Also, the relative position angle between rotor and stator can be controlled at converter part.

72    H. Chen, Z. Shao, "Turn-on angle control for switched reluctance wind power generator system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2367- 2370 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The developed switched reluctance variable speed generator system was introduced. The component parts of the system and the turn-on angle control strategy were presented. The fuzzy logic algorithm for constant output power control was described. The variation of the phase winding DC output voltage and the variation of the phase winding DC output current were the two input control parameters. The turn-on angle of the main switches was the output control parameter. The experimental tested results of the prototype were given.

73    P.J. Portugal, A. da Silva Carvalho, "An approach based on stochastic Petri nets for dependability evaluation of PROFIBUS-DP networks," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2371- 2376 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper presents a framework to evaluate dependability of PROFIBUS-DP networks. A hierarchical modeling approach is proposed, which considers both the effects of permanent and transient faults. Stochastic Petri nets are used as the modelling technique to obtain dependability models, with emphasis in the use of analytical/numerical methods to provide model's solutions. In scenarios where its difficult to apply this approach, compact simulation models are derived.

74    Fan-Tien Cheng, Ching-Tien Lin, "A holonic information exchange system for e-Manufacturing," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2383- 2388 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Under the e-Manufacturing environment, a high-performance and secure information exchange system is essential. For securing those confidential business information and seizing business opportunities, the difficult and important questions (such as how to smoothly exchange the information of different formats among various departments of an enterprise and how to promptly fulfill information exchanging requirements among requests from the cooperative enterprises) shall be resolved thoroughly. Therefore, this paper proposes a holonic information exchange system (HIES) to efficiently translate and dispatch extensive information of different formats among those functional holons within an enterprise, such as communication holon (CH), data warehouse (DWH), holonic manufacturing execution system (HMES), and holonic enterprise resource planning (HERP). The corresponding supply chain information system is designed to adopt the communication specifications set by RosettaNet. Moreover, the major component of HIES, exchange holon, is designed to inherit the generic holon that possesses all the basic properties of a holon and was successfully developed in our previous work. In order to enhance the stability of this information exchange system, the HIES is empowered with the abilities of failure detection and function recover}' for each message flow under processing and exchange holon itself. We believe that the HIES is one of the best solutions for an enterprise to efficiently and securely exchange and integrate internal information.

75    C.E. Pereira, J. Netto, R. Husemann, "A CANOpen profile for multi-tap auto-transformers," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2383- 2388 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the proposal of a CANOpen profile for use in electric energy transmission and distribution plants, more specifically for lap position control and supervision in multi-tap autotransformers using master-slave configuration. The proposed profile allows the interconnection of electric plant sub-station's equipments through a CANOpen network making usage of low cost microcontrolled boards, programmed in Java language. The implemented network adopts the "following master" algorithm in a producer/consumer topology, adding flexibility and temporal determinism to the plant. The realtime behavior of the implemented profile is evaluated using the BR-Tool multiprotocol analyzer developed by the authors.

76    Dong-Sung Kim, Z.J. Haas, "Virtual factory communication system and its application to networked factory machine," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2389- 2393 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we describe the implementation of a virtval factory communication system (VFCS) using the manufacturing message specification (MMS) standard and its application to networked factory machines. In particular, a number of virtual networked machines based on the MMS companion standard (MMS-CS) are implemented to create a virtual networked factory environment. For an application to the networked factory machine, a numerical command (NC) machine is used. The implemented system can be used as a design framework of an MMS system for a practical plant.

77    Dong-Sung Kim, Tae-soo Jun, Wook Hyun Kwon, "Home network systems for networked appliances using power-line communication," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2394- 2399 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes the design and implementation of a home network system using Universal Plug and Play middleware and an embedded interface device. The developed home network system comprises a home server program, home appliance emulators (e.g. for TV, refrigerator, washing machine, or air-conditioner), and an embedded interface device for networked home appliances.

78    Jianfei Pan, N.C. Cheung, Jinming Yang, "Position control of a novel planar switched reluctance motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2400- 2405 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the position control of a novel 2D switched reluctance (SR) planar motor. The planar motor consists of a 6-coil moving platform, and a flat stator base made from laminated mild steel blocks. Unlike conventional X-Y tables, which stack two moving slides on top of each other, the proposed 2D planar motor has the advantages of simple mechanical construction, high reliability, and is able to withstand harsh operating conditions. Together with the two linear encoders attached to the X and Y axes, the motor can be controlled under closed loop mode. To combat the problem of force nonlinearity, this paper proposes a cascade controller with force linearization technique to implement the drive controller. Due to the unique structure of the magnetic circuit, there is very little coupling between the X-and Y-axis, and no decoupling compensation is needed. Preliminary control results show that the proposed VR planar driver has a positional accuracy of 5 microns and an acceleration/deceleration rate of 2G.

79    K. Mainali, S.K. Panda, J.X. Xu, "Position tracking of linear piezoelectric motor using sliding mode control with closed-loop filtering," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2406- 2411 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Piezoelectric motors are used for high precision positioning applications. It is quite difficult to get an exact model of the motor as non-linear phenomenon of inverse piezoelectric effect and friction are involved. Using linear controllers for precision positioning does not result good tracking performance. A sliding mode control based on simplified model of the motor is used. Due to modelling error and external disturbance such control suffers from chattering resulting in wear and tear. Thus a sliding mode control with closed-loop filtering is proposed for position tracking. This scheme has reduced chattering while maintaining robustness property of variable structure control. In this scheme a low pass filter is used to extract the equivalent control from the switching control signals and concurrently a second low pass filter is used to reduce the switching gain. With the extraction or equivalent control or disturbance and reduction of switching gain the chattering is kept at lower level. Experimental results are shown for position tracking of linear piezoelectric motor with and without disturbance. Tracking results observed proves the scheme is effective in extracting equivalent control, reduce chattering and robust to bounded disturbances.

80    Soon-Suck Jarng, Lingfeng Chen, "Design and optimization for CMOS analog hearing aid circuit," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2412- 2417 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Short channel IC circuits become increasingly important in modern high performance electronic systems. In this paper, parts of an analog hearing aid, an amplifier and a regulator, which are implemented with short channel CMOS devices, are designed and optimized in its performance.

81    X. Wu, S.K. Panda, "Position control of micro-cylindrical ultrasonic motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2418- 2423 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper evaluates the dynamic performances of cylindrical ultrasonic motor (CUSM) under the excitation of two sinusoidal signals for both speed and position control application. Such a study is useful for the design of an effective servo control scheme for the CUSM. In particular, it is important to understand the effect of the three possible control variables, namely, voltage amplitude, driving frequency and phase difference of the two excitation sinusoidal voltage waveforms. From the experimental results obtained with a 10 mm diameter and 30 mm long CUSM, it can be concluded that the voltage amplitude control provides high dynamic and steady-state performances for speed/position control of the CUSM.

82    Kuo-Tsai Chang, "Open-circuit test of a piezoelectric transformer and its applications," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2424- 2429 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper investigates the characteristics of a voltage transient response, including time constants, response times, peak voltages and oscillation frequency, for a piezoelectric transformer (PT) under open-circuit operation and their applications. This transient response is induced immediately after an AC voltage applied to the PT is switched off. The time constants can be employed to determine the quality factor and equivalent circuit constants concerning the losses consumed in the PT. Then, an equivalent circuit model of the PT with the initial conditions is used to derive a constituent function of the transient response, involving both DC and AC parts. Moreover, a driving system, including a resonant inverter and a control switch, is constructed to determine the actual transient responses and their characteristics. Furthermore, the effects of both switching-off time of the AC voltage and loading resistance on the characteristics of the transient response are measured and discussed.

83    Wenming Zhang, Guang Meng, Hong Guang Li, "Adaptive vibration control of micro-cantilever beam in MEMS," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2430- 2435 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the dynamical model and governing equations of motion of the micro-cantilever beam with piezoelectric actuator (PZT) are proposed. The Rayleigh-Ritz method is used to reduce the orders of the system and the state equations is presented in modal space. The effects of PZT on the modal frequencies and shapes of beam system can be ignored, the reason is that the beam holding higher nature frequencies and Q values in micro-scale. A rational linearizing feedback controller with a high gain observer is designed to eliminate the unwanted vibration of the beam system. The open-loop step response and the effects of situated places of PZT on the frequency responses of the system are discussed. Various frequency responses of the beam system, subject to different applied control voltages and feedback gains, are illustrated. The four resonances are well controlled, while the anti-resonance has no change. Computer simulations are provided to show the operation of the designed control methods.

84    A.T. Simmons, J.Y. Hung, "Hybrid control of systems with poorly defined relative degree: the ball-on-beam example," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2436- 2440 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, the authors propose a hybrid approach to controlling systems with poorly defined relative degree. The ball-on-beam problem is used as a vehicle for discussion. The hybrid approach employs linear control near the nominal condition. Nonlinear control designed by Lyapunov stability criteria augments the control to increase the region of asymptotic stability. The problem of poorly defined relative degree is also addressed in the control.

85    Y. Li, T. Asakura, "Stabilizing control and chaos phenomena of 2-link pneumatic manipulator with dead time," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2441- 2446 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This research develops with stabilizing control and chaos phenomena of a 2-link pneumatic manipulator in following a circular trajectory by considering a dead time. In generally it is difficult for this manipulator to follow a desired trajectory, because chaos is often caused in the manipulator with a dead time of the pneumatic signal transmitted through the long air tube. In order to solve this land of problem, the chaos behavior is made clear by recording the Lyapunov exponent of the trajectory, and a new stabilizing method with a neural networks (NN) is proposed. Through simulation and experiment, the occurrence of chaos and the possibility of stabilization are verified by using the proposed method.

86    Jen-te Yu, Jie Chang, "Novel systematic approach of gain selection for adaptive backstepping motion control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2447- 2452 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Traditionally, the controller gains and estimator parameters are chosen ad hoc in adaptive motion control systems to achieve the control objectives. This paper considers motor position and velocity control problems and provides novel systematic approach and analytic solution for gain and parameter selection. Specifically we focus on an adaptive nonlinear backstepping motion control algorithm for motor position and velocity command tracking. We reformulate the nonlinear motion control system as a linear time-invariant system plus a nonlinear element in the feedback loop. By this novel reformulation some of the gains appear in the linear system. Stability and convergence rate requirements for the linear system naturally lead to the selection of these gains. By this analysis we also make the connection between the gain selection and the overall motion control system convergence rate both qualitatively and quantitatively.

87    Byung-Eul Jun, D.S. Bernstein, "Least-correlation estimates for errors-in-variables nonlinear models," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2453- 2458 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we introduce a method of parameter estimation working on errors-in-variables nonlinear models whose all variables are corrupted by noise. Main idea is to augment the parameters and the regressors of the linear regressor models by even-order components of noises and by appropriate constants, respectively, and to employ the method of least correlation, which has a capability to cope with errors-in-variables models, for the extended models. Analysis shows that for the polynomial nonlinearity of up to third order, the estimate converge to the true parameters as the number of samples increases toward infinity. We discuss the expected performance of the estimates applied to fourth or higher-order polynomial nonlinear models. Monte Carlo simulations of simple numerical examples support the analytical results.

88    Qinglei Hu, Guangfu Ma, Xueyuan Jiang, "Design of reduced-order robust controllers for flexible structural systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2459- 2463 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An approach of designing reduced-order robust controller for active vibration control of a flexible plate structure is presented in this paper. FU-based robust output feedback control law is designed by using specific transformations of Lyapunov variable with appropriate linearizing transformations of the control variables, which gives rise to a tractable and practical LMI formulation of the vibration control problem. In terms of LMI technique, an H/sub /spl infin// output feedback controller is designed to suppress the low-frequency vibrations caused by external disturbances and to guarantee the stability and performance of the closed-loop system under uncertainties. The order of the controller is further reduced through an iterative two-step LMI-based algorithm for the frequency weighted model reduction problem. The efficiency of the approach is validated by numerical simulation studies of active vibration suppression for the flexible plate.

89    M. Hirata, Y. Ohnishi, T. Yamamoto, "A design of nonlinear PID control systems by using local model identification," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2464- 2469 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a design method of nonlinear PID control systems is proposed. First, some local models are estimated based on least squares method by using piecewise data sets. Furthermore, the PID parameters are calculated by using these local model parameters. Finally, the effectiveness of the proposed nonlinear PID control scheme is evaluated by the simulation example and experiment of temperature system.

90    Yu-Kyoung Sung, Byung-Hun Hwang, Jung-Shik Kong, Bo-Hee Lee, Jin-Geol Kim, "Messages scheduling for a humanoid robot in the CAN," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2470- 2474 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals with the messages scheduling of a CAN (Controller Area Network), based on the distributed control scheme to integrate actuators and sensors in a humanoid robot. In order to supply the distributed processing for a humanoid robot, each control unit should have the efficient control method, fast calculation and valid data exchange. The preliminary study has concluded that the performance of CAN is better and easier to implement than other network such as FIP (Factory Instrumentation Protocol), VAN (Vehicle Area Network), etc. Since a humanoid robot has to treat the significant control signals from many actuators and sensors, the communication time limitation could be critical according to the transmission speed and data length of CAN specification. In this paper, the CAN message scheduling in a humanoid robot was suggested under the presence of Jitter in the message group, the existence of high load of messages over the network and the presence of transmission errors. In addition, the response time under the worst case is compared with the limitation by using the simulation algorithm. As a result, the suggested messages scheduling can guarantee our CAN limitation, and utilize to generate the walking patterns for the humanoid.

91    Kyung-Kon Noh, Jin-Geol Kim, Uk-Youl Huh, "Stability experiment of a biped walking robot with inverted pendulum," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2475- 2479 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper is concerned with a balancing motion formulation and control of the ZMP (zero moment point) for a biped walking robot that has a balancing weight of an inverted pendulum. The original dynamic stability equation of a walking robot is nonlinear; because it's balancing weight is an inverted pendulum type. The stabilization equation of a biped walking robot is modeled as a linearized non-homogeneous second order differential equation with boundary conditions. With the FDM (finite difference method) solution of the linearized differential equation, a trajectory of balancing weight can be directly calculated. Furthermore, it makes that possible input the desired ZMP or ZMP trajectory for various gait, situation and complex motion. Also, it can be easily approximated that a balancing range or motion when some link parameters are changed; especially a balancing mass is changed. In this paper, the simulator with a balancing weight of an inverted pendulum is programmed to get and calculate the desired ZMP and the actual ZMP. The operating program is developed for a real biped walking robot IWRIII-IP. Walking of 6 steps will be simulated and experimented with a real biped walking robot. This balancing system will be applied to a biped humanoid robot, which consist legs and upper body, at future work.

92    Ho-Sik Roh, Jin-Oh Kim, "Manipulator modeling from D-H parameters," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2480- 2485 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We propose a new method of robot manipulator modeling. Previous approaches are based on CAD data or Robot library provided by manufacturers. Our modeler provides two approaches of modeling that can be used by ordinary robot researchers. The first approach is to make a robot model composed of modules created by modifying modules from module library. Second approach is to make a robot model using our module designer with a given set of D-H parameters. The D-H parameters are derived from kinematic design based on a given task. In this paper, we introduce our modeler and the second approach.

93    H.G. Zhang, Q. Wang, "Use of artificial living system for pavement distress survey," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2486- 2490 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Automation of pavement surface distress survey is of considerable interest since it facilitates road maintenance. Pavement distress detection algorithm is proposed, which includes preprocessing and artificial life algorithm. In nature, bee population consists of different species of bees. Different species of bees cooperate with others and build combs. The process of building combs is based on a bottom-up structure instead of a top-down centralized controller like expert system and exhibits the emergent properties of bee population. Artificial living system in artificial life algorithm is very similar to bee population. In artificial life algorithm, artificial living system is an artificial population, which is composed of different species of artificial organisms. Artificial living system is based on a bottom-up synthetic approach and exhibits its emergent properties for distress detection. Experimental results demonstrate the proposed method has strong effect on noise removal, oilstains elimination and the rid of dark spots.

94    H.-W. Lee, T. Kim, M. Ehsani, "Maximum power throughput in the multiphase BLDC generator," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2491- 2496 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents an advanced control technique for maximum power throughput of the multiphase Brushless DC (BLDC) generator of given design. In a generator of given rating, the weight and size of the system affect the fuel consumption directly. Therefore, maximum power density is one of the most important issues in a stand-alone generator. BLDC generator has high power density in the machine point of view and additional increases by control means can be expected. Conventional rectification methods cannot achieve the maximum power possible because of non-optimal current waveforms. The optimal control scheme to maximize power density and minimize machine size and weight in a multiphase, nonsinusoidal power supply system has been derived, incorporated in a control system, and verified by simulation and experimental work.

95    H.-W. Lee, T. Kim, M. Ehsani, "Performance improvement of the linear BLDG generator in a deep space explorer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2497- 2501 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents methods to improve performance of the power supply system in a NASA deep space explorer. In the Stirling engine driven reciprocating Brushless DC (BLDC) generator, the accurate position information of the prime mover is important to diagnose the performance of the engine and prevent the distortion of the output power. Because sensors to detect the position arc fragile and unreliable, and conventional sensorless technique has a drawback in the low speed region, a novel sensorless position detection technique for the prime mover has been proposed and verified. Another major issue of the generator for the spacecraft is power density maximization. The mass of the power system is important to the mass of the satellite. Therefore, the components of the spacecraft should be lightweight. Conventional rectification methods cannot achieve the maximum power possible because of non-optimal current waveforms. The optimal current waveform for maximizing power density and minimizing machine size and weight in a nonsinusoidal power supply system has been derived, incorporated in a control system, and verified by simulation work.

96    Junyou Yang, Rongbin Sun, Jiefan Cui, Xinping Ding, "Application of composite fuzzy-PID algorithm to suspension system of Maglev train," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2502- 2505 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The suspension system of the Maglev vehicle has nonlinear and hysteresis characters. The equilibrium point of maglev system is unstable. It is very difficult to control the suspension system with fine dynamic and static characteristics. A composite model combining PID algorithm with fuzzy control is proposed and a composite fuzzy-PID controller is designed. The proposed algorithm is verified through the simulation and experiment.

97    K. Maneesilp, B. Purahong, P. Sooraksa, "A new analog control circuit design for hexapod using cellular neural network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2506- 2510 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a new design of cellular neural network for controlling hexapod robot movement on forward motion. It shows a set of new state equations which higher propagation than the original one. These new equations reduce number of CNN pattern generation cells from 12 to 6 cells. As a result, this provides a new technique for designing CNN analog control circuits which can be reduced circuit components and simplified the system architectures.

98    Y. Ohba, K. Ohishi, "Friction free bilateral robot based on twin drive control system considering resonant frequency," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2511- 2516 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a new friction free bilateral robot based on twin drive control system considering resonant frequency. The twin drive system consists of two motors, which are coupled by the differential gear. The output torque becomes a different torque of both motors. The nonlinear friction torque of twin drive system can be easily compensated. However, as this system is constructed by the planetary gear and the differential gear, this system has the mechanical resonant frequency. Hence, it often has the tensional vibration. In order to overcome this problem, this paper proposes a new two-mass-model of twin drive system, and identifies these mechanical parameters and the friction torque. Moreover, this paper realizes a fine friction free bilateral control system considering its resonant frequency.

99    Y. Kim, M. Watada, S. Torii, D. Ebihara, "A smooth drive investigation of the discontinuous primary linear synchronous motor in the re-accelerator without position feedback," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2517- 2522 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The discontinuous primary linear synchronous motor is proposed as a driving source in the middle-distance transportation systems in factories and facilities. However, velocity pulsation of the secondary occurs when the secondary mover overlaps with the primary section. This paper describes the examination of constant load angle control without position feedback with the aim to suppress the velocity pulsation, which happens in the re-acceleration part.

100    Liu Lifeng, Cui Jiefan, Wang Chengyuan, Zhao Lijun, Yang Junyou, "Restrained thrust ripple based on a novel voltage space vectors for permanent magnet linear synchronous motor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2523- 2525 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper describes a novel method of voltage space vectors, which is proposed for the direct thrust control of permanent magnet linear synchronous motor (PMLSM). A new switch table is used to select voltage vectors effectively. Proposed control method is proved to diminish the thrust ripple.

101    H. Chen, Z. Shao, "Fault tolerant control for switched reluctance machine system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2526- 2529 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Compared with the fault tolerant control for switched reluctance variable speed motor drive. The indexes that are defined for quantitative analysis of the fault tolerant control for switched reluctance variable speed generator system were introduced, such as the capacity of the output, the relative increment of the phase current peak value, the relative increment of the phase current root-mean square value and the relative ripple increment of the output voltage. The component parts of the switched reluctance variable speed generator system based on the essential conditions for the fault tolerant control were described, such as the structure of the generator, the main circuit topology of the exciting converter. The voltage equation, the power equation, the analysis of the fault tolerant control and the scheme with the output power closed-loop and the output voltage closed-loop by increasing the excited voltage of the normal phases were presented. The experimental tested results of the prototype with the fault tolerant control under the lacking one phase condition were given.

102    Sun-Ku Kwon, Uk-Youl Huh, Hak-Il Kim, Jin-Hwan Kim, "Re-adhesion control with estimated adhesion force coefficient for wheeled robot using fuzzy logic," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2530- 2535 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Mobility of an indoor wheeled robot is affected by adhesion force that is related to various floor conditions. When the adhesion force between driving wheels and the floor decreases suddenly, the robot has a slip state. First of all, this paper is applied by adhesion characteristics and slip in wheeled robot. Secondly, the paper proposes estimation method of adhesion force coefficient (AFC) according to slip velocity. In order to overcome this slip problem, optimal slip velocity must be decided for stable movement of wheeled robot. The paper proposes a re-adhesion control system based on an ordinary disturbance observer, that is, the re-adhesion control is achieved by reducing the driving torque enough to give maximum AFC. In additionally, this algorithm controls recovered driving torque for the restrain the re-slip. Fuzzy logic control (FLC) is pretty useful with prevention of the slip phenomena through that compare fuzzy with PI control for the controller performance in the re-adhesion control strategy. For the configuration of fuzzy sets, proposed algorithm applied by the Takagi-Sugeno model. These procedures are implemented using a Pioneer 2-DXE parameter.

103    A. Jansri, K. Klomkarn, P. Sooraksa, "On comparison of attractors for chaotic mobile robots," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2536- 2541 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In case of no map, trajectory planning could be a difficult task for robot motions to navigate around the assigned patrol areas. Chaotic mobile robots that move in chaotic patterns can be used to solve this problem. This paper is motivated by the question in seeking for suitable chaotic pattern for the aforementioned problem. Twenty-five chaotic patterns generated from various chaotic signals for the robot's path are compared by computer simulation under given conditions.

104    Joo Chan Kim, Jin Young Kim, "Turbo multiuser detector with multimedia transmission for intelligent transportation systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2542- 2545 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: DS/CDMA system is one of the candidates to support multiuser multimedia service due to its many attractive properties for the wireless channel. In intelligent transportation systems, signals from moving vehicles are allocated in a same bandwidth. Therefore, the signals of the low-power users can be distorted by those of high-power users. To avoid this problem, turbo multiuser detector proposed for an intelligent transportation system. As a multimedia transmission strategy, a variable spreading length (VSL) approach is employed by assigning several spreading codes to distinguish each user with constant chip rate. The bit error rate of the proposed system is derived and simulated in both AWGN and Rayleigh fading channels. From the simulation results, it is confirmed that the bit error rate is affected by the number of multiple users rather than difference of each data transmission rate.

105    Chang Sup Kim, Jung-Hyen Park, Keum-Shik Hong, Man Hyung Lee, "Improving odometry accuracy for car-like vehicles by using tire radii measurements," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2546- 2551 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Odometry is the most widely used method for determining the momentary position of a mobile robot. In most practical applications, odometry provides easily accessible real time positioning information in-between periodic absolute position measurements. Odometry errors are caused by two dominant error sources in vehicles: systematic errors and nonsystematic errors. Systematic errors stay almost constant over prolonged periods of time and can be calibrated. In most case of mobile robot, unequal wheel diameters are systematic errors. But, they are not systematic errors in case of flexible tires like passenger car case. Radii of flexible tires are always varied by road conditions, rolling of vehicle and etc. So, it is important to measure the variations of tire radii for accurate positioning in odometry navigation of car-like vehicles. The method for measurement of tire radii is described and experimental results are presented in this paper.

106    Yue Zhou, Hai-bin Yu, Tian-ran Wang, Zhong-feng Wang, Cheng-dong Wu, "DSPN model and performance analysis of WorldFIP MAC sub-layer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2552- 2555 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A detailed DSPN (deterministic and stochastic Petri net) model and performance analysis of WorldFIP MAC sub-layer is constructed in this paper. Firstly, the MAC mechanism of WorldFIP is introduced. Secondly, the accurate modeling of WorldFIP MAC is constructed by using DSPN. Thirdly, the simulation research based on the DSPN model is developed, which gets some valuable quantitative results of WorldFIP system.

107    Li Wang, Shuxin Du, Jinguo Lin, "An active queue management scheme using neural network based predictive control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2556- 2559 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Active queue management (AQM) is a crucial and attractive theme in congestion control for IP network. Though control theory like proportional integral (PI) controller has been applied in AQM, the quality-of-service (QoS) of IP networks cannot always be guaranteed due to their nonlinear, time-varying and uncertain characteristics. In order to provide better QoS, a novel AQM algorithm, namely NNPC-AQM, is proposed based on predictive control, which requires less model accuracy. A predictor is constructed using two-layer linear neural network (NN) to predict the future queue length and a controller is composed of two-layer nonlinear NN to optimize the next drop probability. The performance of the proposed algorithm is verified and compared with PI controller by simulations. The results show that NNPC-AQM is robust against network parameters like number of TCP sessions and round trip time, and its performance has advantages over PI controller significantly.

108    W.K. Ho, C. Yap, A. Tay, W. Chen, K.W. Lim, "Temperature control and in-situ fault detection of wafer warpage," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2560- 2565 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Wafer warpage is common in microelectronics processing. Warped wafers can affect device performance, reliability and linewidth control in various processing steps. We proposed in this paper an in-situ fault detection technique for wafer warpage in lithography. Early detection will minimize cost and processing time. Based on first principle thermal modeling, we are able to detect warpage fault from available temperature measurements. In this paper, the use of advanced process control resulted in very small temperature disturbance making it suitable for industrial implementation. More importantly, the sensitivity for detecting warpage is not compromised even though the temperature signal is small. Experimental results demonstrate the feasibility of the approach.

109    Zhang Hui, Wang Shu-juan, Zhai Guo-fu, "Test conditions discussion of particle impact noise detection for space relay," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2566- 2572 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The space relay reliability influences the national defence system reliability seriously, and precaution and detection of relay remainder are the pivotal factor to enhance the relay reliability. Particle impact noise detection (PIND) is the American military criterion, but there is a lack of working mechanism research. From the point of view dynamics the paper establishes the collision mathematic models of relay remainder based on PIND, and studies the remainder motions and collision mechanism, and derives the relations about PIND vibration table's acceleration, frequency, relay cavity's height and recovery coefficient, and lastly gives the corresponding simulations.

110    Jong-an Kim, Chang-ki Jung, Byung-chul Kim, In-Kyu Choi, Joo-hee Woo, "Digital control system development for turbine control of nuclear power plant," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2573- 2576 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Turbine control system (TCS) controls the speed of turbine and the load of generator. Its reliability directly affects the stability of turbine operation and the quality of electric power. In Korea, the nuclear power plant (NPP) have supplied fundamental portion of domestic electric energy consumption for over 20 years. Demands for retrofitting old TCSs have increased as time goes on because of maintenance difficulties and spare parts shortage. Last year, Korea Electric Power Institute (KEPRI) developed a digital TCS (DTCS) and used it for retrofitting an analog TCS in a NPP. The result was success, and the turbine has been operated reliably with the new DTCS for over one year from initial start up. This paper describes major features of the developed TCS and the results of application.

111    Zhang Hui, Wang Shu-juan, Zhai Guo-fu, "Dynamic model of particle impact noise detection," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2577- 2581 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The space relay reliability influences the national defence system reliability seriously, and precaution and detection of relay remainder are the pivotal factor to enhance the relay reliability. Particle impact noise detection (PIND) is the American military criterion, but there is a lack of working mechanism research. From the point of view dynamics the paper establishes the collision mathematic models of relay remainder based on PIND, and lots of simulations are completed, and some results are obtained.

112    Yun-Joo Nam, Myeong-Kwan Park, "Geometric approach to forward kinematics of casing oscillator," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2582- 2587 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the forward kinematics of the casing oscillator that is a construction machine. The structure of the casing oscillator is similar to those of 4 degrees of freedom parallel mechanisms with a redundancy. With geometric methods, an 8/sup th/-order polynomial in an unknown variable is derived for the forward kinematics using an over-constraint condition which is obtainable from the redundant operation. The proposed forward kinematics has a closed-form solution and enables the auto-balancing control to be achieved in real time. Also, numerical example is presented, and the result is verified by an inverse kinematics analysis.

113    S. Nakamura, Y. Fujimoto, "Structure analysis of logic control programs," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2588- 2593 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a method to divide a large-scale logic program is proposed. The hierarchical structure of the given logic program can be found by using graph theory. An illustrative example of elevator control program is shown as application of the proposed theory.

114    D.X. Tien, K.-W. Lim, L. Jun, "Comparative study of PCA approaches in process monitoring and fault detection," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2594- 2599 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper suggests an alternative scaling approach to PCA analysis for monitoring industrial processes. It also compares performance of the proposed moving PCA (MPCA) and three other PCA-based approaches including conventional PCA, adaptive PCA and exponentially weighted PCA, on a well known simulation model of an industrial plant and on data obtained from a petrochemical plant over a period of X months. The result showed that MPCA, which uses the mean and standard deviation of a moving window for scaling purpose, appeared to outperform the other three methods in monitoring processes with/without changes in operating conditions/set-points. While a conventional PCA seemed to work satisfactorily with the Tennessee Eastman Process (TEP) simulation, its performance was much poorer on the industrial data set. This comparison demonstrates that a degree of adaptation in scaling parameters is necessary for PCA-based approaches, especially for processes with multi operating modes.

115    Zhongfeng Wang, Haibin Yu, Hong Wang, Aidong Xu, Yue Zhou, "The research of XML-based extensible device description for FF fieldbus system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2600- 2603 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Fieldbus technology has been widely used in industrial control system. The coexistence of different kinds of fieldbus standards brings the problem of fieldbus interoperability. This paper proposes a solution named extensible device description based on XML for fieldbus interoperability. With XML we can define standardized fieldbus device description language and uniform interface between configurator and device description source files. The DTD for XML-based fieldbus device description files for fieldbus control system is given in this paper. The interfaces for parsing device description source files are also defined.

116    Xiefeng Cheng, Yewei Tao, Ju Luo, "A new feed forward multilevel and spectrum difference separation BSS denoising method," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2604- 2607 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Blind signal processing in noisy is difficult because there are a great many unknown terms. In this paper, a new BSS denoising method with additive noise is proposed. This method first collected noise sample become noise specimen collections, then circulation subtract noise sample from the observed signal with additive noise in frequency domain, some groups with higher SNR are selected about using a SNR estimation algorithm by the paper given. And the groups are new sources of feed forward multilevel BSS. Feed forward multilevel BSS is that outputs of last separation be regard as the sources of next separation after proper choice and combination. Then using BSS technique repeatedly, residual parts of the noise can be separated. The simulations verified the effectiveness and adaptability of the proposed. What is more, the novel way of using 3D similitude phase graph is also proposed in this paper.

117    Sook Hee Park, "English-French-Canadian French-Korean multilingual electronic database of job titles," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2608- 2613 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We have extracted from WordNet, 1970 job titles to compare with French, Quebec French and Korean equivalents. This is to study a multilingual electronic database model: English-French-Canadian French-Korean. Each job name provides different inner structures such as hypernymic, hyponymic, holonymic, meronymic relations, which are linked to others by multiple ways. This differential structure of WordNet facilitates an automatic research and can specify the meaning of ambiguous words in the text among others. However, we have discovered some problems with the use of WordNet such as the certain weakness of its structure and terminology problems of definition. There is also difficulty in coordinating the different concepts of the above-mentioned languages in order to find an exact matching. Nevertheless, the future elaboration of multilingual database of job titles based on WordNet will serve as an useful instrument for job search, employment, etcetera in various economic matters.

118    Ming Luo, Dan Hong Zhang, Yi Zhi Zhao, Jing Bing Zhang, "A structured methodology for the development of anticipative event management systems with self-recovery capability," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2614- 2619 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Event management is imperative for manufacturing enterprises. This paper presents the concept of anticipative event management (AEM) as a new approach to manufacturing event management that focuses on prediction of the events that are going to happen and the actions that can be taken when the events occur. A structured methodology that is based on a three-dimensional event classification system and an AEM framework is proposed for the rapid development of AEM systems with intelligent self-recovery capability. The paper also presents the conceptual prototype that applies the methodology to the development of an AEM system.

119    Man-Seung Seo, Hae-Ryung Kim, Jae-Sung Song, "Generation of offset curve for pocket with islands based on offsetloop dissection method," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2620- 2625 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In pocket machining, an optimal offset curve generation has been a very difficult problem. In this study, we focus our attention on the dissection of intersecting offset loop. Then, we introduced offset loop entity (OLE) as a key concept. The conspicuous feature of OLE is the capability of enabling every offset curve to be generated without taking account of interfering/intersecting relationship with the pocket/island boundary curve after the first offsetting had performed. Moreover, the devised virtual OLE allows us to treat every kind of island offset loop as same as the pocket offset loop at once. Eventually, the offsetloop dissection method (ODM) is developed. To verify prominent features of ODM algorithm, such as simplicity, applicability, and even consistency, prototype systems are implemented and then examined with actual pocket machining. The results show that the use of OLE concept for offset curve generation is a reliable and proper approach, and ODM algorithm fulfils the requirements for pocketing.

120    Soung-Wook Shin, Kwang-Hyun Cho, "Congestion control of tree-structured multicasting networks based on self-updated RTT for reliable industrial applications," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2626- 2628 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The multicasting in IP-based networks is important to support diverse industrial applications such as data broadcasting. In this paper, a new rate-based congestion control scheme based on self-updated RTT (SuR) is proposed to build an efficient feedback control mechanism for congestion avoidance in multicasting networks. The proposed congestion control scheme based on SuR assures fair allocation of bandwidths and high link utilization of the network.

121    Soung-Wook Shin, Kwang-Hyun Cho, "End-to-end rate-based congestion control using EWMA for multicast services in IP based networks," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2629- 2632 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In high speed communication networks, the determination of a transmission rate is critical for the stability of a closed-loop network system with the congestion control scheme. In this paper, a new rate-based congestion control scheme using an exponential weighted moving average algorithm is proposed to build an efficient feedback control law for congestion avoidance in high speed communication networks. The proposed congestion control scheme assures the stability of switch buffers and higher link utilization of the network.

122    Kyeong-Yuk Min, Jong-Wha Chong, "A real-time JPEG encoder for 1.3 mega pixel CMOS image sensor SoC," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2633- 2636 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose a hardware architecture of low-power and real-time JPEG encoder for 1.3 mega pixels CMOS image sensor SoC which can be applied to mobile communication devices. The proposed architecture has an efficient interface scheme with CMOS image sensor and other peripherals for real-time encoding. The JPEG encoder supports the base-line JPEG mode, and processes motion images of which resolution is up to 1280/spl times/960 (CCIR601 YCrCb 4:2:2,15 fps) by real-time processing. The JPEG encoder supports 8 types of resolution, and can serve the 4 levels of image quality through quantization matrix. The proposed JPEG encoder can transfer encoded motion pictures and raw image data from CMOS image sensor to external device through USB 2.0 and a compressed still image is stored at external pseudo SRAM through SRAM interface. And proposed core can communicate parameters of encoding type with other host by I2C. The proposed architecture was implemented with VHDL and verified for the functions with Synopsys and Modelsim. The encoder proposed in this paper was fabricated in process of 0.18u of Hynix semiconductor Inc.

123    Jin Young Kim, "PN code tracking loop with extended Kalman filter for a direct-sequence spread-spectrum system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2637- 2640 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a PN code tracking loop with extended Kalman filter (EKF) is proposed for a direct-sequence spread-spectrum. EKF is used to estimate amplitude and delay in a multipath fading channel. It is shown that tracking error performance is significantly improved by EKF compared with a conventional tracking loop.

124    Young Eun Ko, Bag Geun Bae, Jin Hwan Park, Sung I Bang, "Structure proposal of the TDMG pulse generator for single band UWB systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2641- 2645 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Being aware of growing needs for wireless communication led to the development of UWB systems, this study proposed an impulse for single band UWB systems which does not count a carrier; analyzed the characteristics and the problems of pulses suggested by the existing pulse of the UWB system; finally, proposed TDMG (time delay multiple Gaussian) pulse that generates signals of UWB without attenuation of pulse width. The hardware structure of the TDMG pulse for the single band UWB system was modeled after describing the pulse in a mathematical method in an attempt to compare with performances of the existing pulses through computer simulation. The outcome of the test unveiled the fact that each center frequency of the TDMG pulse rose approximately 1 GHz, and also each 10 dB fractional bandwidth of the TDMG pulse was widened over 1 GHz. In the case of derivative, center frequencies of the TDMG pulse rose over 1 GHz each. As a consequence, the TDMG pulse appeared to have better quality frequency, satisfying the characteristics of spectrum and the band of frequency recommended by the FCC and decreasing interference with other wireless communication systems.

125    Sung-Shin Lim, Sung-Won Jung, Hyuk-Chul Kwon, "Improving patent retrieval system using ontology," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2646- 2649 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The importance of patents is increasing as intellectual property becomes a core part of any industry. Most commercial patent retrieval systems are based on Boolean models, which are not capable of ranking similarity between queries and documents. In this study, we developed a patent retrieval system (PISS: patent information service system) which uses a vector space model and ontology to improve precision of search results and rank them by similarity. In other to evaluate the performance of query expansion, we tested ten queries, and found that the precision of search results was improved by an average of 36.2%. Ontology and additional search terms are automatically displayed next to search results for users' convenience.

126    Heum Park, Young-Gi Kim, Hyuk-Chul Kwon, "A feature selection for Korean Web document clustering," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2650- 2654 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper is a comparative study of feature selection methods for Korean Web documents clustering. First, we focused on how the term feature and the co-link of Web documents affect clustering performance. We clustered Web documents by native term feature, co-link and both, and compared the output results with the originally allocated category. And we selected term features for each category using X/sup 2/, information gain (IG), and mutual information (MI) from training documents, and applied these features to other experimental documents. In addition we suggested a new method named max feature selection, which selects terms that have the maximum count for a category in each experimental document, and applied X/sup 2/ (or MI or IG) values to each term instead of term frequency of documents, and clustered them. In the results, X/sup 2/ shows a better performance than IG or MI, but the difference appears to be slight. But when we applied the max feature selection method, the clustering performance improved notably. Max feature selection is a simple but effective means of feature space reduction and shows powerful performance for Korean Web document clustering.

127    K. Viswanathan, R. Oruganti, D. Srinivasan, "Non-linear function controller: a simple alternative to fuzzy logic controller for a power electronic converter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2655- 2660 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, there has been an increase in the application of fuzzy logic controllers (FLCs) for control of power electronic converters. Due to FLCs complex algorithm, their realization often calls for a compromise between cost and performance. In this paper, it is shown that the rule table of most of the two-input FLCs used with power converters can be approximated into a single non-linearity. This allows the controller to be easily realized using simple, fast, and inexpensive analog circuits. The simplified 'non-linear function controller (NLFC)' developed in this manner is shown to be equivalent in performance to the original FLC through simulations. The NLFC concept is then applied to PI-FLC, a type of FLC popular in power converter control applications. This results in the PI-FLC being replaced by a simple 'non-linear PI controller (NPIC)'. Using this simplification, the design of NPICs to obtain good dynamic performance in power converters is explained. An example design of NPIC for controlling a DC-DC boost power converter is presented. Experimental results are also presented to demonstrate the superior dynamic performance of the converter with NPIC as against that with linear-PI controller.

128    Weidong Xiao, W.G. Dunford, "Fuzzy logic auto-tuning applied on DC-DC converter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2661- 2666 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a fuzzy logic auto-tuning scheme is proposed to improve the dynamic performance of DC-DC converters by achieving a robust output voltage against load disturbances. The presented two-level control approach adopts the advantages of both fuzzy logic and classical PID controllers in handling with the system's non-linear characteristics. The method is general and simple enough to be applied to any DC-DC converter topology. This paper also presents a large-signal simulation model, which illustrates the effect of the nonlinear nature of switching mode DC-DC converters.

129    F. Jurado, M. Valverde, J. Carpio, "A genetic fuzzy approach for the inverter of solid oxide fuel cell plants," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2667- 2672 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Solid oxide fuel cell system has exceptional potential for electric power generation. For the design of a large capacity inverter, inverter loss reduction and harmonic reduction have been important considerations. This paper presents the design of a new fuzzy logic regulator for a three-phase inverter using the strategy of inverter flux vector control method. The scaling factors of the fuzzy controller are tuned via a genetic algorithm approach.

130    N. Khaehintung, K. Pramotung, B. Tuvirat, P. Sirisuk, "RISC-microcontroller built-in fuzzy logic controller of maximum power point tracking for solar-powered light-flasher applications," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2673- 2678 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the development of maximum power point tracking (MPPT) using a fuzzy logic controller (FLC). By applying the synthetic fuzzy inference algorithm, the relationship between input and output of FLC can be effectively stored in a memory-limited lookup table (LUT). As a consequence, the controller can be efficiently implemented on a low-cost 16F872 RISC microcontroller. A practical system found in a transportation industry, particularly a solar-powered light-flasher (SPLF) with built in MPPT using FLC, is developed. Simulations with practical parameters show that our proposed MPPT using FLC implemented by LUT outperforms the conventional MPPT controller in terms of tracking speed. Furthermore, experimental results are shown to demonstrate the superiority of the proposed technique.

131    Jae Sung Yu, Sun Mo Hwang, Chung-Yuen Won, "Performances of fuzzy-logic-based vector control for permanent magnet synchronous motor used in elevator drive system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2679- 2683 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a fuzzy logic based vector control for the gearless traction machine drive systems using a permanent-magnet synchronous motor (PMSM). The performance of the proposed fuzzy logic control (FLC)-based PMSM drive are investigated and compared to those obtained from the conventional proportional-integral (PI) controller-based drive both theoretically and experimentally at different dynamic operating conditions such as step change in command speed, step change in load, etc. In the simulation and experimental, the fuzzy-logic controller is employed in the speed and current controller. The comparative experimental results show that the FLC is more robust and, hence, found to be a suitable replacement of the conventional PI controller for the high-performance elevator drive system.

132    O. Sago, K. Matsui, H. Mori, I. Yamamoto, M. Matsuo, I. Fujimatsu, Y. Watanabe, K. Ando, "An optimum single phase PFC circuit using CSC converter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2684- 2689 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The conventional boost converters can be generally used for rectifier circuits with power factor correction, while the output voltage can not be adjusted over a wide range. In a case of expanding the controlled voltage range, buck-boost type including Cuk converter should be employed. This paper discusses an optimum circuit configuration for power factor correction. Single-phase power factor correction using a buck boost converter can control the output voltage over a wide range, because it has the ability to step-up and step-down the output voltage. Firstly, this paper compares the mechanisms of the proposed power transmission technique and the characteristics based on the voltage and the current ripple in terms of EMI noise. Secondly, these converters are applied to the single-phase power factor correction. It is found that the CSC (Canonical Switching Cell) is the best choice and selected as the optimum PFC.

133    S.K. Mishra, B.G. Fernandes, K. Chatterjee, "Single stage single switch AC/DC converters with high input power factor and tight output voltage regulation," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2690- 2695 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A single stage single switch AC/DC converter topology based on the concept of Direct Power Transfer (DPT) is proposed. The topology is derived from the integration of a flyback converter and a center tapped flyback-forward converter which are separated by a bulk capacitor to store the difference of the instantaneous input and output power. The flyback converter gives inherent power factor correction (PFC) and the center tapped flyback-forward converter gives tight output voltage regulation. The intermediate DC link voltage is clamped at a preset value. Simulation studies have been carried out to understand the behavior of the circuit. A 100 W (20 V, 5 A) experimental prototype is designed, developed and the performance is evaluated. From the experimental results, it can be inferred that the proposed topology limits the intermediate DC link voltage and gives better efficiency than the conventional single stage converter topologies.

134    J.I. Guzman, J.R. Espinoza, M.A. Perez, "Optimized use of selective harmonic elimination techniques for three-phase AC/DC converters for high power applications," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2696- 2701 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The use of optimized firing patterns for selective harmonic elimination presents several advantages over other modulating techniques. Particularly, in terms of number of eliminated harmonics and commutation frequency. However, the high amplitude for the first group of characteristic harmonics is considered a disadvantage. This paper presents an improvement in the use of selective harmonic elimination techniques for high power rectifiers when two or more three-phase AC/DC cells are simultaneously operated. Indeed, the relative displacement and modulation indexes of the modulating techniques are optimized in order to minimize the amplitude of the first group of characteristic harmonics. Thus minimizing the THD of the AC line currents. The paper includes a systematic formulation of the equations and procedure for the displacement and modulation index computation. Preliminary simulated results confirm the validity of theoretical considerations.

135    H. Huang, Shiyan Hu, D. Czarkowski, "Harmonic elimination for constrained optimal PWM," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2702- 2705 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The selected harmonic elimination (SHE) pulse-width modulation (PWM) inverter eliminates low-order harmonics by optimizing the distribution of switching angles and can generate high quality output waveforms. The goal of optimal SHE-PWM is to select the switching instances (angles) in such a way that a waveform with a particular characteristic is obtained and a certain criterion is minimized. To keep the results realizable in hardware, it is required that the computed consecutive switching angles are sufficiently distant from each other. This well-separation feature is not controlled by classical SHE-PWM algorithms. In this paper, a new algorithm is proposed to solve the SHE-PWM problem with a constraint that any two consecutive solutions are well separated. The algorithm first transforms the problem into a constrained optimization problem, then uses the differential evolution (DE) algorithm to find the roots with the necessary distance of separation. Since the obtained switching angles are reasonably distant from each other, the inverter switches have enough time to operate and can properly finish the switching transitions. Essentially, the proposed method computes the best possible tradeoff between the maximum error for system performance and the minimum distance between consecutive switching angles under certain constraints and it is robust.

136    Tae-Won Heo, Young-Dae Son, Enrico Santi, "Analysis of the interleaved type power factor correction (PFC) converter in discontinuous current mode," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2706- 2711 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Power factor correction (PFC) technique is an important topic in the field of power electronics. This paper presents the analysis of the interleaved type PFC (Power Factor Correction) converter. The input current of this converter automatically follows the sinusoidal line voltage when the converter is operated in discontinuous current mode (DCM). In this paper, the converter is being modeled by applying state space averaging method, and steady state characteristics and dynamic characteristics are analyzed by DC component and perturbation component. From experimental results of 100|W| rated DCM interleaved type PFC converter, the validity of the analyses is confirmed.

137    Ching-Tsai Pan, Shinn-Ming Sue, "A linear maximum torque per ampere control for IPMSM drives considering magnetic saturation," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2712- 2717 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a new maximum torque per ampere control is proposed for an interior permanent magnet synchronous motor (IPMSM) drive to achieve a linear control law with respect to the input in the outer loop. Not only the reluctance torque can be fully exploited but also the magnetic saturation effect is also considered. The theoretical basis of the proposed control is detailed and a prototype is also implemented with a fully digital controller by using a fixed point DSP TMS320F240 to simplify the hardware circuits. Some experimental results are also provided to verify the validity of the proposed control strategy. It is seen that the proposed control can indeed provide improved performances as compared with that of the conventional linear torque control.

138    N. Urasaki, T. Senjyu, T. Kinjo, K. Uezato, T. Funabashi, H. Sekine, "Dead-time compensation strategy for permanent magnet synchronous motor drive taking zero current clamp and parasitic capacitor effects into account," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2718- 2723 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a dead-time compensation strategy for permanent magnet synchronous motor drive taking zero current clamp and parasitic capacitor effects into account. A correction algorithm for false detection of current polarity due to zero current clamp is proposed. In addition, effect of parasitic capacitor of switching device is investigated and incorporated in dead-time compensation strategy. Experimental results demonstrates the validity of the proposed method.

139    R. Dutta, M.F. Rahman, "Investigation of suitable vector control techniques for low voltage IPM machine in 42 V system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2724- 2728 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Higher efficiency and smaller size of the IPM (interior type permanent magnet) machine, make it very attractive for various automotive applications including vehicle propulsion and integrated starter alternator (ISA). Although the design of IPM machine for extended speed operation itself poses many design challenges, the success of the complete drive system depends on the availability of a control algorithm that can extract the most efficient performance from the machine. In the 42 V power-net system of future automobiles, the IPM machine may have rated voltage as low as 20 V. On the other hand, because of the practical constraint of some applications such as ISA, the IPM machines can have characteristic current (the ratio of magnet flux linkage to d axis inductance) less than its peak current rating. In such a machine, available vector control techniques fail to extract the best performance capability of the machine. In this paper a comparative study has been done between two most common vector control techniques for a low voltage IPM machine that have characteristic current less than its peak rated current in 42 V system. The difficulties and shortcomings of both methods are studied using current trajectory in d-q plane.

140    Yen-Shin Lai, Fu-Shan Shyu, Wei-Hwa Rao, "Novel back-EMF detection technique of brushless DC motor drives for whole duty-ratio range control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2729- 2732 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The main theme of this paper is to present a novel back-EMF detection technique which provides whole duty-ratio range control for brushless DC motor (BLDCM) drives. The problems for previous back-EMF detection techniques are clearly explained first. It will be shown that these techniques can be used either for low duty-ratio control or for high duty-ratio control only. The proposed technique deals with the above-mentioned problem to give a whale duty-ratio control while nor invoking any position and current sensors. Experimental results derived from an FPGA-based BLDCM for air-conditioner applications demonstrate that the presented technique works well from standstill to closed-loop operation, extreme low duty ratio, e.g. 1%, and extreme high duty ratio control, e.g. 100%.

141    Z. Xu, M.F. Rahman, "Direct torque and flux regulation of an IPM synchronous motor drive using variable structure control approach," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2733- 2738 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A variable structure controller (VSC) is proposed for direct torque and stator flux linkage control of an interior permanent magnet (IPM) synchronous motor. In comparison with conventional direct torque control (DTC), the inverter switching frequency of the proposed drive is constant and controllable by using space vector modulation (SVM), the torque and flux ripple are significantly reduced. The fast response and robustness merits of DTC are preserved.

142    M. Long, C.-H.J. Wu, J.Y. Hung, J.D. Irwin, "Network security model for analyzing network-based control systems under denial of service attacks," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2739- 2744 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Denial of service (DoS) attacks have become major threats to network security, which is pertinent to the deployment and performance of network-based control systems (NBCS). In this paper, we propose two queueing models to simulate the stochastic process of packet transmission under DoS attacks. The motivation is to quantitatively investigate how the attacks affect the performance of NBCS. The control system consists of a discrete PI controller (either event- or time-driven), a second-order plant, and two one-way delay vectors induced by networks. Experimental results indicate that the event-driven controller is more robust than the time-driven one under attacks. Model I DoS attacks (excessive packet loss) impair the performance, but do not destabilize the system with the event-driven controller. Model II DoS attacks (increased delay jitter) deteriorate the performance or even destabilize the system.

143    Jae-Duck Lee, Jeong-Hyo Bae, Dae-Kyeong Kim, "Development of JPEG 2000 simulator and image quality analysis on bit plane coding," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2745- 2747 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: JPEG 2000 is new standard and it has various useful features. Bit plane coding is JPEG 2000's new coding scheme and by using it, JPEG 2000 can provide various new additional functions like high resolutions image compression, progressive transmission and scalable coding of image, etc. Because bit plane coding is one of key functional block and it play important role in JPEG 2000, we want to analyze its effect on image quality. To do so, we developed JPEG 2000 simulator including forward and inverse transform block, bit plane coding block, Tier-2 Encoder block, etc. By using it, we analyzed JPEG 2000's characteristics, changing number of bit planes and quantization step size. In this paper, we describe on image quality analysis for JPEG 2000's bit plane coding.

144    K. Sekiyama, Y. Kubo, S. Fukunaga, M. Date, "Phase diffusion time division method for wireless communication network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2748- 2753 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a novel communication timing control for a wireless sensor network, named phase diffusion time division method. This is based on the mutual synchronization of coupled phase oscillatory dynamics with a stochastic adaptation, according to the history of collision frequency in the communication node. Through local and fully distributed interactions in the communication network, the dynamics self-organizes an efficient communication pattern, such that the network reduces the collision frequency by diffusion of the phase pattern, but also it sustains the sufficient throughput of communications by the stochastic adaptation. This method is designed for applications in a regular grid model of the wireless network, but it is also extended to the irregular grid model as simulation results exemplify the efficiency.

145    Se-Hee Whang, In-Hun Jang, Hong-Gi Lee, Kwee-Bo Sim, "Self-organizable bluetooth network for distributed autonomous robotic system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2754- 2757 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Distributed autonomous robotic system (DARS) consists of central processing part, communication part, sensor part, and etc. It is essential for DARS, which is made of independent agents. Bluetooth is developed having the features as low power consumption, standard protocol, small module size and etc. So it is suitable for DARS. But it has some constraints like network structure, distance of communication, and so on. To overcome these constraints, more dynamic network system is needed for DARS. In this paper, we propose the self-organizable bluetooth network base on the routing-tree that is more adaptable for DARS. This network system is composed of the following four network-organization procedures-discovery, organization, maintenance, and re-organization (C. Chevallay et al., 2002). Also this system can operate in more dynamic environment and organize communication network by itself. By the reasons, this self-organizable bluetooth network is suitable for DARS and other dynamic environment.

146    Jihyun Yoo, Hyunju Lee, Seokyoung Back, Yongjin Park, "Service quality management for value chain of wireless communication network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2758- 2761 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Over the past few years mobile communication service providers and contents providers have provided their subscribers with quite various services. And the communication networks have accordingly formed a series of complex network technologies by generations (2G, 1X, EV-DO, 3G, etc.). The value chain of simple pay-per-use system has also been moving toward making new profits through diverse services like charge of used contents. To meet the increasingly high subscriber needs and to create new market needs, implementing SQM (service quality management) has become an essential research area. The industry started a debate on how to implement SQM function. In the data for implementing the SQM function there should be all the relevant conditions regarding the subscriber calls. By providing detailed information of the calls in near-real-time, service quality supervising and analyzing between the network managers and service providers, quality information supervising and managing between network managers and customers, and providing quality information between network managers and customers have been allowed.

147    M. Iribe, T. Fukushima, J. Yamaguchi, Y. Kuroki, "Development of a new actuator for a small biped entertainment robot which has suitable functions for humanoid robots," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2762- 2767 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In November 2000, we proposed a small biped entertainment robot SDR-3X (Sony dream robot, a prototype) which realized the dynamic and elegant motion performances. Then, in March 2002, we released the development of SDR-4X which was an advanced model and had a capability of a real-time integrated adaptive motion control. And then, in March 2003, we released the latest prototype model SDR-4XII which realizes advanced motion control functions for safe in addition to its previous models. To realize the capabilities of SDR robot, there are many required performances for its actuators. In this paper, we describe the outline of the robotic actuator development and specific functions which are contributed to SDR-4XII's control.

148    S. Katsura, K. Ohnishi, "A realization of haptic training system by multilateral control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2768- 2773 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In recent years, realization of a haptic system is desired strongly in the fields of medical treatment and expert's skill acquisition. An integrated system design of an analysis of interaction between a robot and environment required for stable contact operation, an observation method of reaction force from the environment, and architecture of bilateral control system is absolutely essential for acquisition and reproduction of a vivid tactile sensation. In this paper, haptic training system (HTS) is realized based on multilateral control. The law of action and reaction is attained by three robots. Bilateral control is extended and multilateral control is introduced. Multilateral control is designed similarly as bilateral control based on the modal decomposition; force is controlled in the common mode, and position is controlled in the differential mode. Scaling factors of position and force are set independently. Therefore, it is possible to change a trainer's assistant force according to a trainee's skill level. Proposed training system based on multilateral control will be a fundamental technology for evolution of haptic devices.

149    Sinpyo Hong, Man Hyung Lee, Sun-Hong Kwon, Ho-Hwan Chun, "Estimation of errors in the integration of GPS and INS," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2774- 2779 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Estimation of errors in the integrated navigation system that consists of a very low-grade inertial measurement unit (IMU) and a single antenna GPS measurement system is studied in this paper. Observability properties of the errors are investigated with a control-theoretic approach. The uncertainties in attitude, gyro bias, and GPS antenna lever arm are shown to cause errors in the estimates of position, velocity, and accelerometer bias. Changes in the acceleration of vehicles improve the estimates of attitude and gyro bias. Changes in the angular velocity enhance the lever arm estimate. Both the motions of translation and constant angular velocity have no influence on the estimation of the lever arm. A car test was performed to confirm the observability analysis.

150    T. Hisada, N. Okuyama, S. Komada, J. Hirai, "Preliminary study on robotic exercise therapy," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2780- 2785 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a new concept of robotic exercise that displays human muscle force during rehabilitation procedures. The estimation is made by combination of an isokinetic dynamometer improved from its original usage for rehabilitation and a conventional muscle force estimation method based on a musculo-skeletal model which has been applied for human gait analysis. The novel isokinetic dynamometer the authors developed has a force sensor for the musculo-skeletal model analysis, and provides an arbitrary training trajectory control function. The musculo-skeletal model analysis is constructed limitedly to the under limb movement, and the muscle force estimation is made in the thigh area by employing the two optimization methods. As a result of experiments, we confirmed that there is really not much difference between the results of two methods.

151    Jing Yang, Eun-Seok Choi, Wook Chang, Won-Chul Bang, Sung-Jung Cho, Jong-Koo Oh, Joon-Kee Cho, Dong-Yoon Kim, "A novel hand gesture input device based on inertial sensing technique," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2786- 2791 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we present a novel gesture-based input device by using inertial sensing technique. The trajectories of user's hand-drawn gestures in 3D space are captured and recognized by this device to fulfill user interaction task. The proposed device employs gyro-free inertial measurement unit (IMU) to track hand motions without requiring any external reference sensors or signals. Since the unbounded growing error of trajectory estimation, as a major drawback of IMU-based motion tracking technology, is carefully solved by using zero velocity compensation. Here, a deliberately-designed motion detection scheme is proposed to capture accurate hand motion period. Finally, the recognition algorithm based on Bayesian networks takes estimated trajectories and finds the corresponding gesture model with the maximum probability. Because the IMU provides outstanding capability of self-contained positioning, the proposed device is extraordinary simple and effective, comparing with the devices using other tracking technologies such as vision-based system. Experimental results also show its effectiveness and feasibility. Currently, after employing the trajectory estimation method provided in this paper, the recognition rate of 95.51% for 14 gestures has been achieved when this device is implemented as a TV remote controller. It can be used as a powerful, flexible interface for ubiquitous computing device.

152    Liu Xing, Jiang Jingping, "Evolutional robust control for nonlinear uncertain systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2792- 2797 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we consider a class of nonlinear uncertain systems in which feedback linearization is possible. Applying nonlinear feedback with estimated parameters and state diffeomorphism. Based on the Lyapunov approach we can develop a kind of evolutional robust controller designed for a class of nonlinear systems with mismatched uncertainty. The simulation result of a numeric example proves that the proposed design is feasible.

153    Y. Toyozawa, H. Kashiwagi, H. Harada, "Identification of Volterra kernels of nonlinear system having backlash type nonlinearity," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2798- 2802 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The authors have recently developed a new method for identification of Volterra kernels of nonlinear systems by use of pseudorandom M-sequence and correlation technique. This method is applied to the measurement of Volterra kernels of those nonlinear systems having backlash type nonlinearity. The comparison of actual output and the estimated output by use of the measured Volterra kernels show that we can still use Volterra kernel representation for those backlash-type nonlinear systems.

154    Y. Kunitoh, H. Yabuno, N. Aoshima, "Design of a nonlinear oscillator using a nonlinear feedback," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2803- 2806 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Resonances induced without periodic excitation are called self-excited oscillation. In the self-excited linear system, the amplitude grows with time. However, the existence of nonlinear damping produces the steady state. In this paper, we propose a method in order to realize the desired steady state amplitudes by using a nonlinear feedback in the self-excited system. Furthermore, it is theoretically clarified in the case of small initial disturbance that the Coulomb friction can avoid the occurrence of the self-excited oscillation in the system with negative damping.

155    Y. Matsuda, N. Ohse, "Total synthesis of structure and control systems with restricted control input," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2807- 2812 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals the total synthesis problem of structural parameters and dynamic output feedback controller for a class of descriptor systems with restricted control input. First, the closed-loop system is described by descriptor form. Secondly, sufficient condition for the state space region with guaranteed L/sub 2/ performance is represented by some matrix inequalities. Based on these matrix inequalities, the total synthesis problem is formulated as an optimization problem. This problem is reduced to two convex optimization problems. This paper presents an improved approach to solve these two problems. A numerical example is demonstrated to illustrate the applicability of the improved method.

156    H.K. Lam, F.H.F. Leung, "Stability analysis, synthesis and optimization of radial-basis-function neural-network based controller for nonlinear systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2813- 2818 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents the stability analysis, synthesis, and performance optimization of a radial-basis-function neural-network based control system. Global stability conditions will be derived in terms of matrix measure. Based on the derived stability conditions, connection weights of the radial-basis-function neural-network based controller can be optimized by genetic algorithm (GA) subject to the system stability. Furthermore, the system performance will also be optimized by the GA. An application example on stabilizing an inverted pendulum will be given to illustrate the design procedure and merits of the proposed approach.

157    Jung-Kwan Kim, Myung-Chul Han, "Adaptive robust optimal predictive control of robot manipulators," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2819- 2824 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we firstly propose a robust optimal predictive control (ROPC) scheme. In the ROPC scheme proposed, an optimal predictive control (OPC) is combined with a robust control that is constructed on the Lyapunov min-max approach. Since the control design of a real system may often be made on the basis of the imperfect knowledge about the model, it is an important trend to design the robust control law that guarantees the desired properties of the system under uncertain elements. By introducing the OPC technique in robust control here, we can find out much more deterministic controller for both the stability and the performance of uncertain nonlinear systems. Secondly, we propose the adaptive version of the ROPC scheme (AROPC). In the AROPC scheme proposed here, the adaptation law estimates the bounds of uncertainties of the system, and the robust control uses these estimates. This scheme is strongly useful in the case that the bounds of uncertainties are not known or known roughly. The analysis of the stability in the sense of Lyapunov is performed. We apply these algorithms to a simple type of 2-Iink robot manipulator and perform the simulations.

158    X. Kong, L.T. Choi, A.M. Khambadkone, "Analysis and control of isolated current-fed full bridge converter in fuel cell system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2825- 2830 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Fuel cells are considered as one of the most prominent sources of green energy in future. However, the potential efficiency of fuel cell will be untapped unless an efficient method can be used to convert the fuel cell low voltage to high voltage grid or user load. Many topologies have been proposed for such applications. However, most of them consider the fuel cell as an voltage source instead of a current source. In this paper, an isolated current-fed full bridge boost converter is proposed as the front-end of the fuel cell system, which is more compatible with the fuel cell particularities. Small signal analysis is applied to the converter and current control method is used. Simulation and experiment results are shown to verify the analysis.

159    R. Attanasio, M. Cacciato, F. Gennaro, A. Consoli, "An innovative boost converter for fuel cells stationary generation systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2831- 2836 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Use of fuel cells for distributed power generation requires the development of a cost effective power converter in order to adapt the fuel cell DC output to the load AC voltage. The main application requirements are high efficiency, low input ripple and low cost. Moreover, for low power systems the voltage step from DC to AC values is considerably high. To achieve such goals, an innovative current fed boost converter with active clamp is proposed, which uses only three low-side switches. In the paper a review of power systems based on fuel cells is given as well as a comparison between standard full-bridge boost and the proposed converter. The design procedure, prototyping, simulation and experimental results are introduced confirming the suitability of the proposed approach to such low cost and high volume applications.

160    Y. Tsujioku, M. Iwase, S. Hatakeyama, "Analysis and modeling of a direct methanol fuel cell for failure diagnosis," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2837- 2842 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In order to consider a failure diagnosis of fuel cells, we develop an experimental DMFC (direct methanol fuel cell), and provide some evaluations and analysis of the experimental results to make a mathematical model used for our diagnosis. By using experimental data, we identify the dynamics of the DMFC, which has several parameters (the temperature, the concentration of methanol, the reaction rate of the electrode and the voltage) using the non-parametric identification method. We try to find an effective model so that the failure and deterioration diagnosis system can be efficiently realized.

161    Jong-Hyun Kim, Myung-Hyo Ryu, S. Shenderey, Jong-Soo Kim, Geun-Hie Rim, "High voltage pulse power supply using IGBT stacks," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2843- 2847 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: High voltage pulse power supply using IGBT stacks and pulse transformer for plasma source ion implantation is proposed in this study. To increase voltage rating, twelve IGBTs are used in series and a step-up pulse transformer is utilized. To increase current rating, the proposed system makes use of synchronized three pulse generators composed of diode, capacitor and IGBT stack. The proposed pulse power supply uses only semiconductor switches made of IGBTs with only two active drivers. Hence, the system is compact, and has long lifetime, high efficiency, and high parameter flexibility such as voltage magnitude, the PRR. and the pulse width.

162    Sang Kyoo Han, Jun Young Lee, Gun Woo Moon, Myung Joong Youn, "Cost-effective energy recovery display driver for 42-inch plasma display panel (IECON '04)," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2848- 2853 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new cost-effective energy-recovery circuit for a plasma display panel is proposed. Since it is composed of two small resonant inductors and four power diodes instead of the conventional large auxiliary circuit, it features a simpler structure, less mass, fewer devices, higher efficiency, and lower cost. Moreover, the very stable and uniform light emitted from a PDP proves the high quality of screen. Therefore, it is well suitable for hang-on-the-wall TVs which have the desirable features such as thinness, lightness, high efficiency, and low price, etc. To confirm the validity of the proposed energy recovery circuit, a comparative analysis and experimental results based on a whole AC PDP driver equipped with the proposed circuit for 42-inch PDP are presented.

163    Sang Kyoo Han, Hyun-Ki Yun, Gun Woo Moon, Myung Joong Youn, "High performance and low cost single switch energy recovery display driver for AC plasma display panel (IECON '04)," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2854- 2859 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new high-performance and low cost single switch energy recovery display driver for an AC plasma display panel (PDP) is proposed. Since it is composed of only one auxiliary power switch, two small inductors, and eight diodes compared with the conventional circuit consisting of four auxiliary power switches, two small inductors, eight power diodes, and two external capacitors, it features a much simpler structure and lower cost. Nevertheless, since the root-mean-square (RMS) value of the inductor current is very small, it also has very desirable advantages such as a low conduction loss and high efficiency. Furthermore, there are no serious voltage-drops caused by the large gas-discharge current with the aid of the discharge current compensation, which can also greatly reduce the current flowing through power switches and maintain the panel to light at a lower sustaining voltage. In addition, all main power switches are turned on under the zero-voltage switching (ZVS) and thus, the proposed circuit has an improved EMI, increased reliability, and high efficiency. Therefore, the proposed circuit will be well suited to the wall hanging PDP TV. To confirm the validity of the proposed circuit, circuit operations, features, and design considerations are presented and verified experimentally on a 6-inch PDP, 50 kHz-switching frequency, and sustaining voltage 141 V based prototype.

164    In-Wha Jeong, Jong-Soo Kim, G.I. Gusev, Geun-Hie Rim, "Design of 35 kJ/s 25 kV capacitor charging power supply for pulsed power systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2860- 2863 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In many modern pulsed power systems traditional power supplies have been replaced by high frequency switching power supplies. These power supplies offer light weight, smaller sizes, and improved efficiencies over traditional power supplies and are suitable for high voltage pulsed power systems. In this paper, a 35 kJ/s 25 kV capacitor charging power supply with a 3-phase resonant inverter and air-insulated transformers is proposed. This capacitor charger greatly improves the stability and maintenance of the conventional power supplies with single phase inverters and oil-insulated transformers. The structural characteristics and experimental results are presented, taken from a laboratory prototype rated at 35 kW, input voltage of 3-phase 380 V, output charging voltage of 25 kV, and operating at 20 kHz. The measured power factor and efficiency at full load are about 90% and the constant output current is about 2.8 A.

165    Y.K. Tan, S.K. Panda, "Iterative learning based sliding-mode position controller for linear permanent magnet brushless DC servo motors," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2864- 2869 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose a robust nonlinear sliding mode controller (SMC) for position control of the linear brushless direct current motor (LBLDCM). Being a nonlinear controller SMC exhibits improved tracking performance compared to the linear PID controller. For periodic position tracking, the tracking performance can be further improved by supplementing a plug-in iterative learning control (ILC) to the SMC. The experimental test results obtained from a 300 mm stroke length, DX20-C4 LBLDCM validates that the nonlinear SMC controller improves the tracking performance by a factor of 10 in comparison with the linear PID controller. Further inclusion of the plug-in ILC, the tracking performance is even improved by another factor of 2. This shows the efficacy of the proposed hybrid position controller.

166    Yen-Shin Lai, Fu-San Shyu, Chia-Wen Lin, Wen-Shen Chang, "Novel torque boost technique for brushless DC motor drives without current sensor," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2870- 2873 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The paper contributes to the presentation of a compensation technique for brushless DC motor drives. The presented technique overcomes the time delay issue caused by the time constant of stator windings of brushless DC motor. The time delay issue results in phase shift between back-EMF and phase current; and thereby reducing the output torque and efficiency. The basic idea for the presented technique is to shift the commutation instant forward such that the back-EMF and the current can be in phase even under the influence of time delay caused by stator windings. It will be shown that no current sensor is required for the presented torque compensation technique. Comparison results derived from experimental system with and without torque compensation technique are presented to support our claims. It will be shown that the presented technique increases efficiency in the whole output range.

167    K. Kawai, M. Tomita, S. Ichikawa, S. Doki, S. Okuma, "Position estimation of synchronous reluctance motor at standstill using disturbance observer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2874- 2878 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, synchronous reluctance motors (SynRMs) have attracted study because of their favorable properties, including limited thermal expansion of the shaft due to low heat generation by the rotor, the ability to drive at high velocity, a low degree of torque ripple and an absence of demagnetization problems. Sensorless control of SynRMs is now desired, and several methods have been proposed. These methods, however, have difficulties at low speed when the voltage signal necessary to estimate rotor position is very small. The authors have proposed a new position estimation method using high-frequency extended e.m.f. (EEMF) in which high-frequency voltage and current are calculated using a disturbance observer. Simulations have shown the new method to be very useful. This paper discusses the ability of the new method to estimate rotor position when the rotor is at a standstill, as demonstrated through experiments.

168    J.B. Ahn, Y.H. Jeong, D.H. Kang, J.H. Park, "Development of high speed PMSM for distributed generation using microturbine," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2879- 2882 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: DG (distributed generation) using microturbine is accepted as typical and practical solution because of its environment-friendliness and high energy efficiency. Various applications such as peak shaving, cogeneration, remote power and premium power will make its penetration more wide-spread. Microturbine is very high speed prime mover, and its mechanical power is transformed to electricity by PMSM (permanent magnet synchronous machine). In this paper, we present analysis and test results of PMSM for DG using microturbine. These verification procedures show us that the developed PMSM can be applied to DG connected to grid or stand-alone operation.

169    W. Xiao, W.G. Dunford, "Evaluating maximum power point tracking performance by using artificial lights," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2883- 2887 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The output characteristics of photovoltaic arrays are nonlinear and change with the cell's temperature and solar irradiation. Maximum power point tracking (MPPT) control in the design of photovoltaic (PV) systems is essential to draw peak power from the solar array to meet the load requirement. Therefore, the performance of maximum power point tracking is an important factor for system designers to evaluate the photovoltaic power system behaviour. In this paper, an experimental evaluation method is introduced to test the performance of maximum power point tracking (MPPT) by using photovoltaic modules and low-cost artificial lights. With controllable insolation level, both dynamic and steady state response of the PV-MPPT systems can be measured and evaluated. It can be treated as a fair method to compare different MPPT control algorithms under the same (or very similar) operating conditions.

170    F.S.D. Reis, J.C. Lima, R. Tonkoski, V.M. Canalli, F.M. Ramos, A. Santos, M. Toss, U. Sarmanho, F. Edar, L. Lorenzoni, "Single stage ballast for high pressure sodium lamps," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2888- 2893 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper will be reported the study and implementation of a single stage high power factor (HPF) electronic ballast for high pressure sodium (HPS) lamps using a LCC filter. In the recent years many authors are working to obtain single stage HPF electronic ballast for fluorescent lamps. Normally to obtain HPF in electronic ballast for high pressure sodium lamps a power factor preregulator (PFP) is used between the mains and the electronic ballast. The main idea in this work is to present a simple and cheap electronic ballast with HPF for HPS lamps. This solution has the advantage of avoiding the acoustic resonance phenomena, but, in the other hand, it has a high crest factor. Design criteria and simulation results will be also presented in this paper.

171    Wen-Nan Huang, Ching-Cheng Teng, Chih-Hsing Fang, Chih-Hsin Chen, "Inductance measurement and estimation method utilizing LC circuit analysis techniques under dynamic operation for switched reluctance (SR) machines," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2894- 2899 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The method for the inductance measurement applying the LC circuit concept, which means circuit with inductance and capacitor effect, for analysis of switched reluctance (SR) motors in operation status is proposed in this paper. The inductance profile is an important parameter bearing on the performance of a SR motor. The main strategy of the presented methodology is to combine the standard circuit topology analysis results and machine's equivalent model to find a dynamic measurement method for the inductance related magnetization characteristics. The capacitors in series or parallel connection to the SR machine phase inductance are the key components to construct the applicable LC circuit analysis model. Besides, this method owns the capability that being easy to be extended to estimate the incremental inductance for further performance prediction. The measurement results of two SR motors taken into verification both demonstrate the effectiveness of this method under dynamic operation condition while comparing to the conventionally off-line static measurement.

172    S. Dalapati, C. Chakraborty, "A high performance electronic ballast for fluorescent lamp employing current feedback scheme," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2900- 2905 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A simple, easily realizable, high performance electronic ballast has been presented. The converter topology employs a current feedback scheme to achieve input-current-shaping. A boost converter shapes the current based on the current feedback while the inverter operates in self-oscillating mode reducing additional circuit components. A simplified analysis has been presented. The PSPICE simulation results match excellently with that obtained from the experiments. The ballast exhibits flicker-free start and operates in the frequency range of 20 kHz-30 kHz. Almost sine wave input current profile with very high power factor has been achieved.

173    Wang Shujuan, Zhang Hui, Gao Hongliang, "Research on parameter optimization design method of electronic ballasts based on orthogonal design," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2906- 2910 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: It is required that a high-quality electronic ballasts (EB) for fluorescent lamps should not only have excellent performance, but also have a high reliability. This paper takes the typical circuit structure of electronic ballasts as the subject, establishes its simulation model with Pspice circuit, and makes parameter optimization design of multiple objective function for its input harmonic content, power factor and coefficient of wave peak, which has further enhanced the reliability of the system while keeping the good performance targets.

174    Yong Feng, Lixia Sun, Xinghuo Yu, "Finite time synchronization of chaotic systems with unmatched uncertainties," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2911- 2916 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, finite time synchronization of two chaotic systems with unmatched uncertainties is presented by using a terminal sliding mode controller. The error dynamics between the master chaotic system and the slave chaotic system is established firstly. Then a terminal sliding mode manifold and a control methodology are proposed to guarantee the state variables of the error dynamics to reach the sliding mode manifold in finite time, and then converge to the neighborhood of the equilibrium points in finite time along the sliding mode manifold. The mathematical relationship between the neighborhood of the equilibrium point and the range of the unmatched uncertainties and parameters of sliding mode is formulated. It is shown that the proposed controller is invariant to the matched uncertainties, and the controller can guarantee the error system to reach the neighborhood of the equilibrium points when unmatched uncertainties exist. Simulation results are presented to validate the design and the analysis.

175    Byung-Eul Jun, D.S. Bernstein, "Least-correlation estimates for errors-in-variables models," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2917- 2922 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper introduces an estimator working on errors-in-variables models whose all variables are corrupted by noise. The necessary and sufficient condition minimizing the criterion, defined by the square of empirical correlation between residuals with a non-zero time interval, gives the least-correlation estimates. The method of least correlation can be interpreted as a generalization of the least-squares. Analysis shows that the estimator has a capability to find out the best fit without bias from noisy measurements even contaminated by colored noise as the number of observations increases. Monte Carlo simulations for numerical examples support the consistency of the estimator. The least-correlation estimate is not an orthogonal projection but an oblique projection. We discuss interesting geometric properties of the estimate. Finally recursive realizations of the estimator in continuous-lime domain as well as in discrete-time are mentioned briefly.

176    Shun-ichi Akama, Tetsuya Tabaru, Seiichi Shin, "Bayes estimation of road surface using road noise," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2923- 2928 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper proposes a novel and simple method of estimating a road surface by means of a road noise. The noise is measured with an IC voice recorder, and a Bayesian estimator decides a sort of surface based on the noise. It is assured that the estimator works well on actual cars which run on dry asphalt, wet asphalt, turf, and so on.

177    J.K. Wu, "Frequency tracking techniques of power systems in noises," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2929- 2933 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A technique for tracking the frequency of power systems in sine noises using numerical differentiation is presented in this paper. A voltage or current sinusoidal signal corrupted by a sine noise with the frequency varying from 0 to 300 Hz. the amplitude varying from 0 to 300 V, and the phase angle varying from 0 to 360 is taken into consideration. Using central numerical differentiation with 7 points, the proposed algorithm shows more advantage in time and speed compared with other existing techniques, and shows better dynamics and high accuracy in frequency estimation. Carried out in Matlab, the simulation results are satisfactory.

178    Xiaohua Jiang, Ji King, A. Emadi, "A power harmonics detection approach based on the least squares energy minimization principle," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2934- 2938 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new approach to power harmonic detection and a fast algorithm for computation of the total harmonic distortion (THD) are proposed based on the least squares (LS) method and the Parseval theorem. This approach is applied to detect a certain order harmonic component of stationary signals or nonstationary signals with little computational cost in comparison with other common techniques such as the Kalman filter and the FFT, thus it can track the time-varying harmonics and can be used to reconstruct the compensation reference current template real time in harmonic control systems especially in active power filters. The theoretical analysis results of the harmonics estimation error are given also. The inter-harmonics are taken into account in the THD algorithm. The THD is calculated based on the sum of harmonics energy estimated in terms of Parseval theorem and the reconstructed fundamental component by using the LS scheme, thus the tracking of time-varying THD becomes possible. Experimental results both in the ideal condition and noisy condition associated with the LS, the Kalman filters and the FFT are given also.

179    M. Chikano, H. Hashimoto, A. Watanabe, "An approach toward unification of architectural design and habitability based on network sensing," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2939- 2941 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, the mass customizations become a common idea for manufacturing products, and people seem like being able to get any products that they want. A house or a building is one of the last products to compromise with fulfilling the individual requirements. This paper describes our approach to realize a next generation living complex being able to align lifestyle changes of residents, or user requirements through lifetime periods of the complex. Establishing a platform structure unaffected by major technological changes is important to give a flexible and an upgradeable feature to a complex. Network sensing is a key idea to obtain information regarding human behaviors with appropriate reliability. Since there is no limitation of user-backgrounds in habitation environments, human interfaces are much more important than any other cases.

180    Gan Ping Lee, Ming Lee, Hui He Shao, Xu Zhao, "Networked intelligent controller based on embedded system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2942- 2945 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The design and development of a Networked Intelligent Controller (NIC) based on embedded system is presented. The developed controller is an intelligent remote unit featuring embedded technology for access control, monitoring and output control. Basically, the controller has data acquisition, computation, transducer and networked communication functions. The device has low power consumption and small size. With Ethernet, control and supervision are accomplished through an industrial local area network. Using a high integrated 32-bit RISC microprocessor combined with serial A/D and D/A converters made the electronic systems compact with high performance. The controller offers the widest range of features and flexibility, with an overall design for reliability, durability and case of installation. Expanded input and output capabilities can be added to maximate its functions. Based on ARM embedded system, the controller can even run operation systems. Such a Networked Intelligent Controller can be used for various applications involved in real-time controls.

181    Feng Xia, Zhi Wang, Youxian Sun, "Simulation based performance analysis of networked control systems with resource constraints," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2946- 2951 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Performance analysis is an integral part in the development of a networked control system (NCS) since it answers the key question of whether the resulting quality of control (QoC) fulfills its requirements. It is also difficult to analytically quantify the impacts of CPU and network constraints on QoC of NCS. In present work, a simulation-based approach to performance analysis of NCSs subject to CPU and network constraints is proposed, in a manner of integrating scheduling, communication and control. The characteristics of control loop timing are presented as a combination of computational delay and communication delay. A numerical example involving DC servo problems is employed to illustrate our simulation-based approach. How CPU and network constraints, based on different scheduling schemes and network protocols, affect the control performance is shown. Simulation results and analysis give valuable suggests for NCS design.

182    Chang-Hwan Choi, Yong-Chil Seo, Seungho Kim, "Brushless DC motor controller for tele-operation using embedded real-time Linux," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2952- 2956 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recently, the motor controllers requires various functions not only real-time control but also communication capabilities with remote host computer and other motor controller for synchronization. This paper presents a brushless motor controller for tele-operation by using the RTLinux and FPGA technologies. The proposed controller is composed of an embedded RTLinux board with StrongARM microprocessor made by Intel co. ltd., capable of Ethernet connection, a high speed current controller implemented by using an FPGA, and a two channel BLDC motor driver for precision current control.

183    Jung-Hee Park, Jeong-Hyun Kim, Seong-Bae Park, Sang-Jo Lee, "Term co-occurrence-based corpus network," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2957- 2960 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper draws the term nodes and their links in corpus network based on term co-occurrence, and resultantly grasps its properties, using the mathematical graphs and the network-related physical measures. The topological processing of singular value decomposition (SVD), which compresses a large amount of co-occurrence information into a much smaller space, is similar to the common feature of feed-forward neural network systems where a large number of inputs are connected to a fairly small number of hidden layer nodes. Until now, the diagonal values by SVD have not been interpreted in full and the statistical step of hidden nodes depends only on the input. It is supposed that this study will provide the visual clues, which were described in the corpus, of the contraction-expansion homeostasis of the corpus network, and will help for actualizing the ambiguous axis in a space generated by SVD and characterizing the more efficient input-dependant steps of hidden nodes.

184    Y. Uchimura, T. Yakoh, K. Ohinishi, "A controller design method on decentralized systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2961- 2966 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose a new controller design method for decentralized system. The method includes an arrangement scheme of multi-controllers and a controller design procedure via the LMI method. The arrangement scheme is based on analysis of a transitional probability matrix, which is induced from a connection matrix. In the scheme, we characterize the stable equilibrium value of probability matrix as the dense of the connection and determines the order of the subsystem. Multi-controllers are arranged according to the priory order and constitute a decentralized control system. The controller design utilizes the function of LMI based methods, which enables one to put constraints on the form of the feedback controller. By applying a change of variables method and setting up the structure of variable to be the same as the controller structure, the desired controller is obtained. We show a design procedure of a stabilizing controller. The validity of proposed methods is examined on a numerical model.

185    Eun Bo Shim, Chae Hun Leem, Chan Hyun Youn, "System biological modeling of circulation: from cells to system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2967- 2972 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A new multi-scale simulation model covering from cells to system is proposed to analyze hemodynamics of cardiovascular system. Electrophysiology of a cardiac cell is numerically approximated using the previous model of human ventricular myocyte. Ion transports across cell membrane initiated by action potential induce excitation-contraction mechanism in the cell via cross bridge dynamics. Negroni and Lascano model (NL model) is employed to compute the tension of cross bridge closely related to ion dynamics in cytoplasm. To convert the tension in cell level into contraction force of cardiac muscle, we introduce a simple geometric model of ventricle with a thin-walled hemispheric shape. It is assumed that cardiac tissue is composed of set of cardiac myocytes and its orientation on the hemispheric surface of ventricle remains constant throughout all the domain. Application of Laplace law to the ventricle model enables us to obtain a ventricular pressure that induces blood circulation in body. A lumped parameter model with 6 compartments is utilized to compute systemic circulation interacting with the cardiac cell mechanism via NL model and Laplace law. Numerical simulation shows that ion transports in cell level eventually generates blood hemodynamics in system level via cross bridge dynamics and Laplace law. Computed results using the present multi-scale model are well compared with the existing ones. Especially it is shown that the typical characteristics of heart mechanics, such as pressure volume relation, stroke volume and ejection fraction, can be generated by the present multi-scale cardiovascular model covering from cardiac cells to circulation system.

186    Ho Jong KiM, Hyeon Chul Lee, Chul Han Kim, Yun Jin Kim, Gye Rok Jeon, "Blood flow and pressure in a brachial artery under cuff pressure," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2973- 2977 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In the present work, we investigate the artery pressure across a brachial artery under the cuff pressure. Deformation of the arm tissue is numerically simulated with the finite element method. The artery pressure is analyzed based on hemodynamics of blood circulation. From the analysis, it is found that the cuff pressure deforms the arm tissue significantly, but not the artery wall. Deformation of the artery wall is not significantly affected by the artery pressure. The artery pressure is found not to decrease significantly across a part of the arm pressurized by the cuff.

187    K.J. Chun, H.J. Lee, Y.Y. Won, M.H. Beak, H.S. Moon, R. Park, "A study on standardization of the internal and external morphology in the mandibular first premolar," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2978- 2981 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Mandibular first premolars obtained from two each of men and women between the ages of 40 to 50 years old were scanned using a micro-CT. Data were measured from the scanned 2-D images by way of measurement software. Measured data were compared with the morphological data presented by G.V. Black. The 2-D scanned images were reconstructed into 3-D models for FEA (finite element analysis), then stress distribution of the inner and outer part of the teeth were shown. We found that the inner and outer morphology of the teeth play an important role in contributing to fatigue fracture. The necessity of inner and outer morphological data and a part of Korean teeth standardization are presented in this study.

188    Young-Ho Yoon, Eui-Sung Jung, Ho-Kyung Kang, Min-Kyu Kim, Byung-Seop Song, Jin-Ho Cho, "Design of implantable wireless biomedical signals telemetry system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2982- 2986 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: For the measurement of biomedical signals in the under body, a miniaturized implantable wireless telemetry system is implemented. This overall system consists of a charging system, an IR receiver, a multi-channel signal processor and a FM transmitter. All the parts are packed in the titanium case of which size is 50(L)/spl times/27(W)/spl times/7(H) mm. To control the implanted device at the external body and utilize the advantages of the simplification of circuit structure and the reduction of power consumption, an infrared wireless communication method has been adopted. The implements system uses a unique data protocol to prevent the interferences from other infrared remote control of the household appliances. The surface of the implanted device has been coated by biocompatible material to be implanted in the body. This system can be applied to measurements system of various kinds of bio-signals such as bio-electrical, bio-chemical and bio-mechanical signals, including EMG, ECG, insulin level, blood pressure signal etc.

189    Young Jin Lee, Sang Ki Kim, Kwon Soon Lee, "Auto steering control of unmanned container transport (UCT) with vision system and mediated immune algorithm controller," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2987- 2991 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we proposed an adaptive control method which is named CMIA mediated immune algorithm) controller to control unmanned container transport using in the harbor. It is based on specific immune response of the biological immune system which is the cell-mediated immune response. It is also applied for the autonomous guided vehicle (AGV) system which is manufactured in this paper. The AGV is used for the port automation to carry container manlessly and get uncertainty and nonlinearity because of running in the outdoor. To verify performance of the proposed CMIA controller, some experiments for the control of steering of that AGV are performed. Finally, the experimental results for the control of steering and speed of AGV system illustrate the effectiveness of the proposed control scheme. These results for the proposed method also show that it has better performance than other conventional controller design methods.

190    Jin-Woo Lee, Jin-ho Suh, Young-Jin Lee, Kwon-Soon Lee, "High precision control for linear motor-based container transfer system with cogging force and friction," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2992- 2997 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we will introduce concerning a control strategy that is the multi-step prediction control of linear motor-based container transport system for high precision using dynamically-constructed recurrent fuzzy neural networks (DR-FNNs). Linear motor-based container transport system (LMCTS) is horizontal transfer system for the yard automation, which has been proposed to take the place of automated guided vehicle in the maritime container terminal. LMCTS is considered as that the system is changed its model suddenly and variously by loading and unloading container. The proposed control system is used two DR-FNNs for multi-step prediction. Consequently, the system has an ability to adapt for a huge rolling friction, cogging force, force ripple, and sudden changes of itself by loading and unloading.

191    Jin Ho Suh, Jin Woo Lee, Young Jin Lee, Kwon Soon Lee, "Anti-sway control of an ATC using NN predictive PID control," Industrial Electronics Society Annual Conference, Vol.3 , pp. 2998- 3003 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we develop anti-sway control in proposed techniques for an ATC system. The developed algorithm is to build the optimal path of container motion and to calculate an anti-collision path for collision avoidance in its movement to the final coordinate. Moreover, in order to show the effectiveness in this research, we compared NNP PID controller to be tuning parameters of controller using NN with 2 DOF PID controller. The experimental results for an ATC simulator show that the proposed control scheme guarantees performances, trolley position, sway angle, and settling time in NNP PID controller than other controller. As result, the application of NNP PID controller is analyzed to have robustness about disturbance which is wind of fixed pattern in the yard. Accordingly, the proposed algorithm proposed in this study can be readily used for industrial applications.

192    Dong-Seop Han, Geun-Jo Han, "The effect of the drop height of a container on impact reaction force of the impact absorbing system in shuttle car for the LMTT," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3004- 3007 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: LMTT (linear motor-based transfer technology) is horizontal transfer system in the maritime container terminal for the port automation. The system is driven by PMLSM (permanent magnetic linear synchronous motor) that consists of stator modules on the rail and the shuttle car. The impact absorbing system that consists of compression spring is located between the frame and the stator module in shuttle car for the LMTT. We investigate the effect of the drop height of container on impact reaction force of the impact absorbing system (IAS) in shuttle car for LMTT. The results of this investigation are obtained from detailed finite element analysis for various parameters, such as the spring coefficient, the drop height of container.

193    Jung Jae Lee, Gi Gun Nam, Bong Ki Lee, Jang Myung Lee, "Measurement of 3D spreader position for automatic landing system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3008- 3013 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper introduces a novel approach that can provide the three dimensional information on the movement of a spreader by using two CCD cameras and a laser distance sensor, which enables an ALS (automatic landing system) to be used for yard cranes at a harbor. So far a kind of 2D laser scanner sensor or laser distance measuring units are used as corner detectors for the geometrical matching between the spreader and a container, which provides only 2D information which is not enough for an accurate and fast ALS system required presently. In addition to this deficiency in performance, the price for the system is too high to be adopted widely for the ALS. Therefore, to overcome these defects, a novel method to acquire the three dimensional information for the movement of a spreader including skew and sway angles is proposed using two CCD cameras and a laser distance sensor. To show the efficiency of proposed algorithm, real experiments are performed to show the accuracy improvement in distance measurement by fusing the sensory information of CCD camera and laser distance sensor.

194    F. Han, X. Yu, Yi Wang, M. Al-Dabbagh, "Sinusoidal steady-state analysis for fault location in power distribution systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3014- 3018 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper studies fault location with single-ended measurement when a line-to-line short-circuit fault occurs in an overhead radial three-phase distribution wire. Sinusoidal steady state analysis based on the distributed-parameters model of the transmission wires is employed to locate a fault. By injecting two sinusoidal excitations with different frequencies to the faulted phases, measuring the voltages and currents phasors at the sending-end of the wire and solving certain nonlinear distributed-parameter equations, the distance and resistance of fault candidates can be determined. It is shown that the one has the minimum difference between the calculated fault distances or fault resistances under the two frequencies are the most likely actual fault point. A fault locator based on the proposed scheme is designed and implemented. The parameter measurements of wires as well as the receiving-end transformers in the field are studied. Simulation on the physical model of distribution wire shows that this fault location scheme works successfully.

195    L.A. Pereira, D. da Silva Gazzana, "Rotor broken bar detection and diagnosis in induction motors using stator current signature analysis and fuzzy logic," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3019- 3024 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a study and the practical implementation of a system for the detection and diagnosis of broken rotor bars in electrical induction motors. Motor current signature analysis (MCSA) and fuzzy logic techniques are utilized in order to achieve that. Initially, a brief description of the MCSA is introduced. The causes of broken rotor bars are discussed and characterized with the equations that indicate the presence of components in the frequency spectrum. Subsequently, failure diagnosis techniques based on fuzzy logic are presented and discussed. Afterwards, the results of the practical implementation of failure detection and diagnosis system are shown and commented. MATLAB 6.0, and more specifically the following toolboxes: DSP BlockSet, fuzzy logic and real-time workshop, are used as a development tool. The implemented and tested method showed efficiency as the practical results corresponded to the proposed methods. The results obtained present a great degree of reliability, which enables them to be used as a monitoring tool for similar motors.

196    J. Zitzelsberger, W. Hofmann, "Effects of modified modulation strategies on bearing currents and operational characteristics of AC induction machines," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3025- 3030 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Newest investigations have shown that bearing currents can be lowered by using modified pulse pattern generation methods. One suggestion for such a solution is the principle of sequentially positioned pulses. Hereby, a modified space vector modulation is used, in order to reduce both the amplitude of and the number of potential alterations in the common mode voltage. This voltage is the reason for EDM and dv/dt currents which are mostly responsible for severe bearing damages in modem inverter fed drive applications. The paper will show the fundamental basics concerning this principle and its characteristic influences on the operational behaviour of an inverter fed AC induction machine.

197    A.A. Abdallah, V. Devanneaux, J. Faucher, B. Dagues, A. Randria, "Modelling of surface-mounted permanent magnet synchronous machines with stator faults," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3031- 3036 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Rotating electrical machines play a very important role in the world's industry. Among them, the permanent magnet synchronous machines are more and more used because of their high power to weight ratio, their great efficiency and the recent affordability of magnet materials. Permanent magnet synchronous machines are also more and more envisaged in high power applications (railway applications for instance). In this context, these machines can be submitted to external and internal stresses, and degradation can occur in their electrical and mechanical parts. The adoption of permanent magnet synchronous machines in applications such as electric propulsion has been hindered by concerns about special risks posed by short-circuit faults in these machines. This is why industry is interested in adopting monitoring and diagnosis techniques to assess and evaluate condition of these machines. The modelling of surface-mounted permanent magnet synchronous machines with stator faults takes place in this context. A rich and flexible model of surface-mounted permanent magnet synchronous machines with stator faults is proposed here. A coupled magnetic circuits approach is used and very few restrictive assumptions are made. All parameters are calculated from the actual geometry and winding layout of the machines rather than from transformed or equivalent variables. The detailed depiction of the procedure needed to implement this model with simulation results is the subject of this paper.

198    Tae-Jin Kim, Ju-Won Baek, Jin-Hong Jeon, Geun-Hie Rim, Cheul-U Kim, "A diagnosis method of DC/DC converter aging based on the variation of parasitic," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3037- 3041 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we propose a new diagnosis method of DC/DC converter aging. The method is based on the variations of parasitic resistor for the aging process. We apply an on-line diagnosis of DC/DC converter from the system point of view, not device-wise, but a system. This study proposes a method of DC/DC converter diagnosis by analyzing the variations of model on the variations of parasitic resistor.

199    Qijun Pan, Weiming Ma, Dezhi Liu, "A study of open-line fault in transformer of a six-phase diode rectifier system with tap-changer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3042- 3047 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A typical broken line fault sometimes occurs in a six-phase diode rectifier system with diode tap-changer. A detailed theoretical analysis of this phenomenon is presented in this paper. Simulation and experiments have been carried out to verify the validity of the theoretical results. It is pointed out that the six-phase converter with one broken line is equivalent to parallel connection of two single phase rectifiers. The output DC voltage takes the waveform of a positive semi-sine, which causes severe DC ripple and electromagnetic interference (EMI). Most of the load current flows through the bridge connected with the star winding, whereas a small amount through the bridge connected with the delta winding. The conclusions are very significant to choose parameters of the transformer and rectifier diodes. Furthermore, it is important to the fault diagnosis and the real-time processing.

200    S.H. Hosseini, M.R. Banaei, "A new minimal energy control of the DC link energy in four-wire dynamic voltage restorer," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3048- 3053 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The quality of electrical energy supply such as voltage sag is becoming more important for sensitive loads. This paper deals with four-wire dynamic voltage restorer (DVR), which is a series device that generates an AC voltage and injects it in series with the supply voltage through an injection transformer to compensate the voltage sag. In this paper the techniques of correcting the supply voltage sag in a distribution feeder is presented. In addition, a new concept of restoration techniques is proposed to inject minimum energy based on given apparent power for DVR during compensation. Simulation results carried out by PSCAD/EMTDC, show that the proposed method could be minimizing the injection real power of DVR with given apparent power.

201    M.A. Perez, R. Ortega, J.R. Espinoza, "Passivity-based PI control of three-phase switched power converters," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3054- 3059 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper addresses the practically important question of when a nonlinear system can be asymptotically stabilized with a linear PI control, and show that it is possible if the system can be passified with constant control actions. This result is used to propose a constructive methodology to design PI schemes for switched power converters, which are viewed from a novel perspective: with the switches acting as effective "port variables" that establishes a passive mapping with a suitably defined outputs. Detailed calculations are given for the three-phase rectifier and experimental results that compare the performance of the proposed PI with other linear and nonlinear designs.

202    C.A. Sepulveda, J.R. Espinoza, L.A. Moran, R. Ortega, "Analysis and design of a linear control strategy for three-phase UPQCs," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3060- 3065 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A linear control scheme applied to a UPQC which is based on back-to-back connected series and parallel compensators sharing a common DC link is presented. The topology combined with the proposed control strategy allows to compensate for utility disturbances such as flickers, sags and swells. It also provides reactive power and current harmonic compensation. As a result, the load operates under constant supply voltage while the utility at a given power factor. Additionally, taking advantage of the arbitrary load phase, an optimization algorithm permits to operate the topology at minimum power losses thus improving the overall system efficiency. Preliminary simulated results confirm the theoretical considerations.

203    M. Thomas, T. Martin, J.C. Balda, "Design and error analysis of a digital line impedance meter," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3066- 3070 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The impedance preceding a motor driver circuit has always been a concern to those who manufacture the motor drives. A method is presented which will allow for accurate measurement of the source and line impedance of an AC power line. This has been made possible primarily due to the increasing speed of analog to digital converters. The design and error analysis of measuring the source and line impedance is presented.

204    U.K. Madawala, J. Stichbury, S. Walker, "Contactless power transfer with two-way communication," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3071- 3075 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a novel technique that can transfer power with two-way communication over a gap with no physical contacts. The proposed technique uses two separate loosely coupled parallel resonant circuits to transfer power from one system to another with two-way communication. Experimental results based on a 5 W prototype system built for powering a display panel on a refrigerator door are presented. The technique is simple, low in cost, and should find applications where both power transfer and data transmission are required with no physical contacts.

205    A. Cid-Pastor, C. Alonso, B. Estibals, D. Lagrange, L. Martinez-Salamero, "Automatic measurement system for testing photovoltaic conversion chains," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3076- 3081 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper presents a computer-based instrumentation system suitable fur the characterization of photovoltaic conversion structures. Consisting of a data acquisition stage, a data processor, twelve photovoltaic generators and several power conditioners, the system automatically evaluates the respective efficiency of maximum power point tracking (MPPT) and power conditioning. The efficiency of unknown MPPT functions is estimated with great accuracy by means of an extremum control-based MPPT used as a reference. Evaluating the efficiency of three photovoltaic battery chargers during a 8-hours day of solar irradiation illustrates the estimation procedure and the system test facilities.

206    E. Roman, P. Ibanez, S. Elorduizapatarietxe, R. Alonso, D. Goitia, I.M. de Alegria, "Intelligent PV module for grid-connected PV systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3082- 3087 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Most issues carried out about building integrated PV systems (BIPV) performance show average losses about 20-25% in electricity production. The causes are varied: mismatching losses, partial shadows, variations in I-V characteristics of PV modules due to manufacturing processes, differences in the orientations and inclinations of solar surfaces, temperature effects, etc. Most losses can be decreased by means of a suitable electronics. This paper shows the Intelligent PV Module concept, a low cost and high efficiency DC-DC converter with MPPT functions, control and power line communications (PLC). Several DC-DC configurations have been considered as well as MPPT methods and communication options. Matlab simulations describe how this Intelligent PV Module can make a significant improvement in the energy delivered, above all in facades and roofs, in which the number of modules and the external conditions make this device most suitable.

207    T. Kinjo, T. Senjyu, N. Urasaki, H. Fujita, "Output levelling of wind power generation system by EDLC energy storage," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3088- 3093 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Utilization of renewable energy are coming up from view points of environmental conservation and depletion of fossil fuel. However, the generated power from renewable energies is always fluctuating due to environmental status. Energy storage system is indispensable to compensate these fluctuating components. Energy capacitor system (ECaSS) connected an electric double-layer capacitor (EDLC) with power-electronics devices is useful for the compensation of fluctuating power since one is capable of controlling both active and reactive power simultaneously. This paper proposes the current-source ECaSS (CS-ECS), which consists of EDLC, buck-boost DC-DC converter, and bi-directional inverter. We have presented the control system for the active/reactive power control of CS-ECS, and have shown the effectiveness of CS-ECS through computer simulations for case of wind power generation system.

208    N. Mutoh, M. Ohno, T. Inoue, "A method for MPPT control while searching for parameters corresponding to weather conditions for PV generation systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3094- 3099 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A method for a maximum power point tracking (MPPT) control while searching for optimal parameters corresponding to weather conditions is described in this paper. The conventional method has problems that it becomes impossible to acquire the generating power at the maximum power point in low solar radiation (irradiation) states. It was found experimentally that the maximum output power and the optimal current which gives this maximum had a linear relation in low irradiation states. The linearity is maintained in low irradiation states because the surface temperature of solar arrays is seldom changed. On the other hand, as the surface temperature changes in high irradiation states, the linearity collapses. However, assuming that there is no temperature change within several ms, the proportionality (voltage) coefficient between the maximum output and optimal current is searched for using the hill-climbing method. This procedure is done when the irradiation (mean value) is more than half the rated power. Below the mean value, the MPPT control is done based on the inherent linearity regarding solar arrays using the proportionality (voltage) coefficient obtained at the mean irradiation. The proposed MPPT method can enlarge the controllable range of the output power for lower solar radiation in comparison with the conventional method. Effectiveness of the method is verified by experiments.

209    F.S. dos Reis, K. Tan, S. Islam, "Using PFC for harmonic mitigation in wind turbine energy conversion systems," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3100- 3105 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Permanent magnet synchronous generators (PMSG) wind energy conversion system (WECS) using variable speed operation is being used more frequently in wind turbine application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and an increase in energy capture. To allow the variable speed operation of the PMSG WECS a conventional three-phase bridge rectifier (BR) with a bulky capacitor associated with voltage source current controlled inverter (VS-CCI) is used. This simple scheme introduces a high intensity low frequency current harmonic content into the PMSG and consequently increases the total loses in it. Subsequently, decreases the power capability of the system. In this paper a simulation study using a single-switch three-phase boost rectifier (PFC) applied to harmonic mitigation in this systems is presented.

210    T. Ahmed, S. Nagai, M. Nakaoka, Hyun Woo Lee, "Two-switch auxiliary quasi-resonant DC link snubber-assisted voltage source three-phase V-connection soft-switching sinewave inverter with bidirectional soft-switching chopper for solar PV power conditioner," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3106- 3110 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper is concerned with a novel proposal of the utility AC interactive three-phase soft commutation sinewave PWM power conditioner developed for solar photovoltaic power generation system and parallel processing UPS with new type battery and super capacitor energy storage devices. The prototype of this power conditioner is composed of two quadrant soft switching PWM chopper with step-up and step-down voltage operating modes, three-phase V-connection soft switching PWM inverter incorporating a single two-switch auxiliary resonant DC link snubber into one phase of three-phase bridge legs with divided capacitors, and the three-phase utility AC power source grid. The operating principle of the proposed power conversion conditioning circuit and system including some unique features and based upon high-frequency soft switching sinewave PWM scheme is described and discussed. The operating performances; waveform quality and actual efficiency of cost effective utility interactive power conversion conditioning and processing circuit treated here are evaluated and discussed on the basis of experimental data.

211    Young-Kil Kim, Mun-Pyo Hong, Chang-Hyun Kim, Sang-Kyu Park, "Word sense disambiguation using lexical and semantic information within local syntactic relations," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3111- 3114 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Until recently, most of WSD models have used adjacent words surrounding a target word as context information for word sense disambiguation. The difficulty of parsing Korean sentences and properly analyzing their structures restricted us to use syntactic relations to select proper senses of Korean words. In this paper, we propose the method to disambiguate Korean noun senses in unrestricted lexis using a statistical WSD model based on lexical and semantic information within syntactic relations. We disambiguate noun senses step by step in the range of local syntactic relations such as VP, NP and compound nouns. We classified the meaning of Korean nouns with about 400 semantic codes allowing for 8 levels in the semantic hierarchy and experimented for 1,838 homographs using the semantic information in consideration with syntactic relations. In the experiment, average senses of homographs that have different translations are 2.84 and the precision of word sense disambiguation is 86.2%.

212    Miran Choi, Jeong Hur, Myung-Gil Jang, "Constructing Korean lexical concept network for encyclopedia question-answering system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3115- 3119 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Advanced natural language processing technique is essential for the encyclopedia question-answering system. As an important knowledge base for our encyclopedia question-answering system, we have constructed lexical concept network for Korean nouns and verbs. This paper introduces the processes and methods of constructing lexical concept network, current status of the network built so far and how it is applied in the question-answering system.

213    Soojong Lim, Euisuk Jung, Myoung-Gil Jang, "Dependency relation analysis using case frame for encyclopedia question-answering system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3120- 3124 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: One of the principal challenges of natural language processing is a natural language parsing. In this paper, we suggest a dependency parsing approach based on case frame with chunk, distance information, existence of case, and clausal information for encyclopedia QA system. Because we cannot construct case frames for all verbs, we use distance information, existence of case, and clausal information for the absence of case frame. In addition to dependency parsing, we use post-processing for applying to Korean encyclopedia QA system.

214    Hanmin Jung, Kyungkoo Min, Won-Yong Kim, Won-Kyung Sung, Dong-ln Park, "Query analysis using context-based information extraction on navigation domain," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3125- 3130 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Information extraction is an appropriate methodology to process queries in purposeful dialogs such as navigation and question answering. We apply information extraction to find meaningful instances from queries on navigation domain and to fill them into predefined slots. To deal with various ambiguities and flexible utterances of queries, we introduce three-leveled robust rules; instance extraction, filtering, and ranking rules. The extraction rules select instance candidates by matching the input query with lexico-semantic patterns. Using the context consisting of lexico-semantic patterns and slot names, the filtering rules remove improper ones among the candidates, and the ranking rules endow them with positive scores. We choose navigation domain as a test environment to experiment the adaptability of information extraction. Our experimental result shows the understandability against user's queries increases up to 97% even though speech recognition has only the accuracy of 75.2% in sentence level.

215    Sung-Won Jung, Sung-Shin Lim, Hyuk-Chul Kwon, "Three level method using machine learning and rule based approach for extracting Web-table information," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3131- 3136 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Generally, Authors of HTML documents use various methods to clearly convey their intention. The table is the preeminent method among these, because the table contains meaningful data displayed in a structure with rows and columns. However, on the Internet, tables are used for the purpose of the knowledge structuring as well as design of documents. It is not easy task to distinguish those two tables because HTML does not separate presentation and structure. This makes information extracting from those tables more difficult. Therefore, in this paper, we are firstly interested in classifying tables into two types: meaningful tables and decorative tables. After that we extract information from meaningful tables.

216    Hwi Woong Jeong, Aesun Yoon, "XML based language resource management," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3137- 3141 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper introduces the language resource article structure using XML (extensible markup Language) and methodology for effective language resource management. Researches for the Natural Language Processing were just focused on information retrieval, analysis for lexical analysis, specific data Pusan (speech recognition and document summarization etc.), not on effective language resource management area. In addition, though computational linguistics researchers tried to shrink difference between computer science and linguistics, their efforts were focused on the lexical analysis and making computer oriented linguistic roles. We see language processing in different point. If there were sufficient computerized language resources and analysis tools, Natural Language Processing progressed much more. In this paper, we will introduce the XML based document structure for language resource management and Web based language resource management graphic user interfaces which are designed to support language resource purifying and management. The XML document structure for language resource is designed to obtain multiple articles in one XML document. It aids multilingual translation system and terminology search system. Its structure will give manageability, usability, efficiency for a language resource management.

217    Joongsun Yoon, Myeungsook Yoh, Hyewon Lee, "Interactive tangible media: iT/spl I.bar/Media," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3142- 3147 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Recent paradigm in technology shifts from object-based technology to environment-based technology. Issue here is interaction among humans and the world around humans. The world we consider includes natural and artificial "space". Holistic interactions based on "Mom (embodiment)" suggest a good starting point for exploring this issue. Soft engineering, "Mom", holistic interactions, tangible space, ubiquitous computing, science of emotion, and interactive media are key concepts. Interactive tangible media "iT/spl I.bar/Media" is proposed to explore and synthesize these ideas. Interactive technology initiative (ITI) is an interdisciplinary research group to search for the proper technology and the proper way of implementing technology: "interactive technology" or "soft engineering". Some experimental activities conducted by ITI are presented in this session, "Interactive Technology".

218    Joongsun Yoon, Sangjoo Park, Jinyoung Kim, "Emotional robotics based on iT/spl I.bar/Media," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3148- 3153 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Intelligence is thought to be related to interaction rather than a deep but passive thinking. Interactive tangible media "iTMedia" is proposed to explore these issues. Personal robotics is a major area to investigate these ideas. A new design methodology for personal and emotional robotics is proposed. Sciences of the artificial and intelligence have been investigated. A short history of artificial intelligence is presented in terms of logic, heuristics, and mobility; a science of intelligence is presented in terms of imitation and understanding; intelligence issues for robotics and intelligence measures are described. A design methodology for personal robots based on science of emotion is investigated. We investigate three different aspects of design: visceral, behavioral, and reflective. We also discuss affect and emotion in robots, robots that sense emotion, robots that induce emotion in people, and implications and ethical issues of emotional robots. Personal robotics for the elderly is investigated to explore these ideas.

219    Sangjoo Park, Joongsun Yoon, "Interactive education of introductory engineering," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3154- 3159 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We introduce an introductory engineering course for engineering majors and non-engineering majors. This course does not require any previous knowledge and experience on engineering. It requires strong curiosities and imaginations on current and future society we live in, where technology is inseparable ingredient. Course encourages attendees to explore fundamental issues of engineering: what is proper technology and what are proper ways of exercising engineering, issues dealt in soft engineering. Since course topics cover many aspects of technology, traditional learning methods fail to be successful and efficient. Various efficient learning methods have been proposed and implemented. We utilize various interactive tangible media, which include simulated thought experiments and physical media experiences. About 20 episodes in short film format are produced based on scenario written according to related issues selected. Physical media like interactive robots are introduced for attendees' stimulated experiences. We summarize our exciting experiments on interactive teaching experiences at Pusan National University, which include on/offline interactions, assignments, projects, and evaluations.

220    Joongsun Yoon, "Robotics projects based on soft engineering," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3160- 3165 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Soft engineering, based on symbiotic coexistence of human, machines and environment, is a new engineering field to explore the proper technology and the proper way of engineering. To explore soft engineering intents easily, various robot projects at Pusan National University conducted are presented. Thought experiment, interactive e-leaning, rapid prototyping engineering, biomimicry, tangibility, and ubiquity are concepts to be explored. Thought experiments projects are organized and performed, which include robot assembly game, Turing test, and robotics in science fiction. "Junk robot project" and "ubiquitous Pusan National University (u-PNU) project" have been organized. Also, bug robot project, interactive robot project, and interactive emotional robot projects are introduced. Weekly science fiction films are shown and discussed.

221    Joongsu Yoon, "An interactive evolutionary system "IFGAM"," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3166- 3171 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: An interactive system is investigated in the context of extension and intention of gene, memo, and man. An interactive evolutionary system is explored to implement composing machine as a modern art form. Music based on fractals and genetic algorithm, IFGAM, is proposed and composed. Humans are interacting with a genetic algorithm-based evaluator, a human fitness function based on heuristic tune variations, to improve the musical seed data generated by fractal algorithms. IFGAM's learning scheme can be extended and applied to the complicated engineering problems with difficult to define performance evaluations, where humans can do well.

222    R. Gobbi, N.C. Sahoo, "A fuzzy iterative approach for determination of current waveform for switched reluctance motors using a torque sharing function at positive and negative torque production regions," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3172- 3177 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: This paper deals with a fundamental control issue in switched reluctance motor (SRM) drives - the torque ripples. Normally, torque ripple minimization is achieved by using a look-up table, i.e., the look-up table uses stored magnetic characteristics to provide the reference current for some specified torque. A number of techniques for the generation of reference current profiles that minimize the torque ripples have been suggested. But, because of highly nonlinear characteristics of the SRM, all these schemes are not fully successful. Our work deals with a novel algorithm for generation of current waveforms by modulation of the reference current pattern of the two-phase-on scheme with torque sharing functions at both positive and negative torque production regions by means of a multiplying factor for minimizing the torque ripple. This multiplying factor is computed with the aid of fuzzy logic, which is well suited to compensate for the nonlinearities of the system. Performance of the proposed strategy is verified by simulation.

223    Deok-Hee Song, Il Yong Eom, Seul Jung, "Comparison studies of two neural network compensation techniques for standard PD-like fuzzy controlled robotic manipulators," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3178- 3183 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, a novel neural network compensation technique for PD like fuzzy controlled robot manipulators is presented. A standard like fuzzy controller is designed and used as a main controller for controlling robot manipulators. A neural network controller is added to the reference trajectories to modify input error space so that the system is robust to any change in system parameter variations. It forms a neural-fuzzy control structure and used to compensate for time-varying effects. The ultimate goal is same as that of the neuro-fuzzy control structure, but this proposed technique modifies the input error not the fuzzy rules. The proposed scheme is tested to control the position of the 3 degrees-of-freedom rotary robot manipulator. Performances are compared with that of other neural network control structure known as the feedback error learning structure that compensates at the control input level.

224    Young Im Cho, "Development of a new neuro-fuzzy hybrid system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3184- 3189 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: There are many neuro-fuzzy hybrid systems which resolve some problems in the traditional fuzzy inference system. To resolve these problems, how to effectively combine neuro-fuzzy systems is very important. In this paper, I will propose an effective hybrid system methodology by stepwise performance evaluations. I will apply the proposed system to DC series motors in order to evaluate the validity of the proposed system. Also, how to resolve some problems of the traditional inference system will be shown here.

225    Nam Hoon Kim, Uk Youl Huh, Jin Geol Kim, "Fuzzy position control of motor plant with backlash," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3190- 3195 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper, we design a fuzzy system to compensate the delay due to backlash nonlinearity, the fuzzy compensator is constructed from some common-sense rule. We focuses on the feasibility of fuzzy logic controller (FLC) to stabilize the system with uncertain backlash. We prove that under certain conditions the fuzzy compensator guarantees that the backlash output converges to the desired trajectory. Furthermore, the performance of the proposed controller is compared with that of convention proportional-derivative (PD) controllers. Base on the simulation result, it is found that the proposed controller can be a viable choice due to its robustness against parameter uncertainty.

226    Mengjia Jin, Jianqi Qiu, Cenwei Shi, Ruiguang Lin, "A fuzzy DTC method with a SVM defuzzification to permanent magnet synchronous machine," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3196- 3199 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: A fuzzy direct torque control (DTC) algorithm to permanent magnet synchronous motor (PMSM) with a novel space vector modulation (SVM) defuzzification is proposed. The defuzzification unit outputs a vector contains two voltage vectors as well as the duty of each vector instead of a single vector. And more voltage vectors can be obtained. A simulation model is built up, basic DTC and conventional fuzzy DTC and proposed fuzzy DTC are carried out respectively. Torque ripple, flux ripple and current distortion are compared and analyzed. The proposed fuzzy controller makes the torque and flux ripples lower and current smoother compared with basic DTC and conventional fuzzy DTC.

227    G.J. Choi, J.I. Bae, S.B. Kim, D.S. Ahn, "Map building and localization of unknown environment using graph method and fuzzy inference system," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3200- 3205 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We propose a new localization and map building method similar to that of human being in the navigation problem. Human being is assumed to solve a problem through four processes: exploration process (EP), decision process (DP), behavior process (BP) and learning process (LP). We call the processes as human being's capability for solving problems. In this paper, we try to solve navigation problems by transferring this human being's capability into a mobile robot. Firstly, in the exploration process, the mobile robot collects the environment information and builds the map using the method called 'graph'. Secondly, in the decision process, the mobile robot selects a proper action on the basis of the percepted information and the generated 'graph'. Thirdly, in the behavior process, the selected action is implemented in accordance with the output of the FIS (fuzzy inference system). Finally, in the learning process, the parameters of 'graph' are updated via repeated implementing. We show that this method is promising for the mobile navigation problems through a number of simulations.

228    Soo young Ye, Do un Jeong, Jung Man Shon, Byeong Cheol Choi, Gye Rok Jeon, "Evaluation of the heart rate variability using the HRV analysis during general anesthesia," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3206- 3210 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: We examined the spectral analysis and 1/f noise of heart rate variability during enflurane anesthesia in order to assess the effect of activity of the autonomic nervous system. Data were acquired from 15 patients (ASA I-II) who got the gynecological surgery under general anesthesia using enflurane, nitrous oxide and oxygen. We have analyzed the spectral components of HRV according to the following five periods: 1) before premedication (S/sub pre/) 2) after induction (S/sub indu/) 3) skin incision (S/sub inci/) 4) recovery (S/sub awake/) 5) after surgery (S/sub post/). For each power spectrum density, the frequency components were identified as follows: (1) LF component (0.04-0.15 Hz) is associated with parasympathetic and sympathetic tone effected by body temperature, rennin-angiotensin system, baroreceptor and vasomotor sympathetic modulation, (2) HF component (0.15-0.5 Hz) mediated parasympathetic tone and reflecting mechanical influence of ventilation. In addition the LF/HF ratio reflecting the cardiac sympathovagal balance was monitored. The LF/HF ratio that reflects the balance of the autonomic nervous system increased remarkably during skin incision and recovery. Also, the index that shows the body activity decreased during skin incision and recovery. The increase of LF/HF was caused by mechanical stimulation, which reflects the autonomous nervous system balance. The index was useful for assessment of the body activity.

229    Soo young Ye, Do un Jeong, Jung Man Shon, Jong Duk Park, Byeong Cheol Choi, Gye Rok Jeon, "Monitoring of the EEG using the bispectrum analysis on the anesthetic depth," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3211- 3215 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this study, a distribute characteristics on the bispectral coupling of EEG were observed according to depth of anesthesia using bispectrum analysis method in a type of nonlinear signal processing. 25 patients of the general anesthesia were studied. In the preprocess, base line correction and linear detrend was used. In awakening state of patient in pre-operation and post operation, appearance rate of bispectral coupling was observed that a strong appearance rate was represented in major frequency zone such as (15,15) Hz but weak appearance rate investigated in the other minor frequency zone. During the anesthesia of patient, a strong appearance rate revealed the low frequency range below (10, 10) Hz and a weak appearance rate viewed in the other frequency range. Also the result was compared with the delta ratio and spectrum edge frequency (SEF). Delta ratio shows significant lower values at induction (3.60-0.98) and maintenance (5.0-4.74) of anesthesia than preoperation (10.30-2.44) and postoperation (13.03-2.29) (P<0.05). These result was consistent with a trend of delta ratio that the index of evaluation for depth of anesthesia known as a reflex of the conscious level of patient's during anesthesia. While these results were not consistent with the analysis result of SEF that the index of evaluation for suppression level of patient's during recovery stage of anesthesia. SEF shows lower values at maintenance (17.00-1.22) and postoperation (12.20-1.53) than preoperation (22.50-1.75) and induction (22.40-1.18) of anesthesia (P<0.05). The analysis method of bispectrum was useful information about the index of evaluation according to the level of unconsciousness and suppression among other evaluation factor on depth of anesthesia.

230    J. Lee, S.P. Cho, "A study of fetal ECG separation from small channel abdominal ECGs using ICA," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3216- 3218 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Algorithm to extract fetal ECGs with a few channel data gathered from the wearable fetal ECG module was proposed. By adding fake noise signals to two-channel abdominal ECGs which eliminated noise using wavelet transform, ICA was applied. As a result, maternal ECGs were gained that excluded fetal ECGs. Along with the signals, the application of adaptive filter extracted fetal ECGs from ECGs signals that fetal and maternal ECGs existed together.

231    Byeong Cheol Choi, Hee Jeong Lee, Soo Young Ye, Dong Keun Jung, Gi Ryon Kim, Kwang Nyon Kim, Gye Rock Jeon, "Evaluation of arterial compliance on pulse transit time using photoplethysmography," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3219- 3222 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Pulse wave velocity has been widely used as an index of arterial distensibility. Peripheral pulse transit time (PTT) is inversely related to pulse wave velocity. The aim of this study was to evaluate the validity of PTT on the monitoring of arterial distensibility. We evaluated the accuracy of computerized measurement of peripheral PTT using an algorithm based on the time interval between the peak of R wave of ECG and maximal slope point in pulse. A experimental results were presented as a graph using spline interpolation. Application software was implemented in C++ as a window-based program. The increase of heart rate and pulse transit time reflect the hemodynamics changes by skin temperature. It is of great interest to evaluate in large populations the therapeutic and epidemiological applications of an arterial parameter as evaluated by peripheral PTT.

232    Min-Kyu Kim, Ji-Hun Han, Young-Ho Yoon, Byung-Seop Song, Jin-Ho Cho, "Implementation of miniaturized microphone unit for implantable hearing aid and its characteristics," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3223- 3226 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: In this paper the miniaturized microphone unit that can be utilized to the implantable middle car and inner ear is designed and implemented. The implantable microphone unit that planed to set up in the center of the pinna has been designed to ensure the necessary dynamic range and to improve the sensitivity of microphone unit. In addition to, the microphone unit is miniaturized and its biocompatibility of human body is considered. The microphone unit is composed of a minimized electric microphone, a titanium case which has 5.3 mm diameter and 3.7 mm height, a SUS316L vibrating membrane of 10 /spl mu/m thickness which is touched with a hypodermic tissue and adopted for the less attenuation of microphone sensitivity. Through the experiments of the fabricated microphone unit, it is verified that the implemented microphone unit operates up to the bandwidth of 5 kHz without declining of sensitivity in the 6 mm hypodermic tissue.

233    A. Perlinger, K.M. Buck, H.W. Li, H.L. Hess, "Essentials of SOI technology for small power supply applications," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3227- 3230 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: The relationship between that of silicon-on-insulator (SOI) technology and ordinary CMOS is presented followed with an examination of the basic features of MOSFETs fabricated under the SOI process. Such features include the intrinsic junction diodes, diffusion capacitance, floating-body effect, internal parasitic bipolar effects, the insulation layer and its consequences, and the self-heating effect. In addition to the fact that many of these features provide improvements in transistor design and performance over standard CMOS, SOI technology is poised to become competitive for small power supply applications.

234    A. Perlinger, S. Subramanium, Vinesh Sukumar, H.W. Li, H.L. Hess, "Temperature-independent high voltage reference design in silicon-on-insulator CMOS technology," Industrial Electronics Society Annual Conference, Vol.3 , pp. 3231- 3234 Vol. 3, 2-6 Nov. 2004.   Abstract Link    Full Text

Abstract: Temperature independence for voltage reference circuits designed in silicon-on-insulator CMOS technology. This design takes advantage of high-voltage devices recently developed for a 0.35 um process. This paper focuses on unique aspects of design in this process, using a voltage reference as a vehicle. The underlying circuit is a high voltage reference, designed in a diode configuration and in a MOSFET configuration. Layout considerations common to both of the circuits are outlined. Design equations are developed. Performance is characterized through SPICE simulations.