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AFRICON Conference

作者： Kh. El-Shennawy M. Mousa Faculty of Engineering and Technology Department of Computer and Electronic Studies Arab Academy for Science Technology and Maritime Transport Alexandria Egypt

This paper presents the transfer function of the ideal theoretical distorsionless surface acoustic wave (SAW) bandpass filters, having a frequency bandwidth 2B. The required transfer function have constant magnitude and linear phase, centered at the carrier frequency f/sub c/. In the time domain, the impulse response of the required SAW filter is a cos(2/spl pi/f/sub c/t) carrier wave, modulated by a sine function centered at the constant time delay t/sub 0/ of the transmission signals. This impulse response is multiplied by the rectangular window function to be a finite impulse response (FIR). Two methods are introduced. The first method, the Fourier transformation, is based on the convolution theorem principle of the required transfer function and the convolving weighted sine function of the rectangular window function. The second method uses the pre-envelope, complex envelope, and the conjugate theorem principle of the Fourier transformation. The nonflat response in the passband (Fresnel ripples), sidelobe rejection level in the stopband (Gibbs ripples) and transition bandwidth are discussed. Verification of the solution has been done and comparison between the two methods are also discussed. Typical values of the SAW filters are a carrier frequency f/sub c/, of 100, 240, 300 MHz, bandwidth 2B of 46.7, 140, 120 MHz, and transducer length /spl tau/ of 1.05 /spl mu/s, 350 ns, 6 /spl mu/s, respectively. The second method shows a very important criterion should be taken into design consideration which is EXP(/spl plusmn/j2/spl pi/f/sub c/t/sub 0/) equal to unity, causing the product of the carrier frequency f/sub c/ and the transmission time delay t/sub 0/ (f/sub c/t/sub 0/) should be an integer number.

关键词： Transfer functions Frequency Surface acoustic waves Bandwidth SAW filters Delay effects Acoustic waves Band pass filters Finite impulse response filter Convolution

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Dynamic control of a unified power flow controller

Dynamic control of a unified power flow controller

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： Q. Yu S.D. Round L.E. Norum T.M. Undeland Faculty of Electrical Engineering and Computer Science Norwegian Institute of Technology Trondheim Norway Department of Electrical & Electronic Engineering University of Canterbury Christchurch New Zealand

The performance of a unified power flow controller (UPFC) with four different controllers is evaluated through simulation and implementation in an experimental laboratory model. The controllers which were investigated are the PI controller, PI controller with decoupling, cross-coupling controller and robust H/spl infin/ controller. It is found that the cross-coupling and robust H/spl infin/ controllers have the best performance when the exact value of the power transmission parameters are unknown.

关键词： Load flow Inverters Power transmission lines Control systems Robust control Transmission line theory Distributed parameter circuits Laboratories Power transmission Power electronics

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Investigation of dynamic controllers for a unified power flow controller

Investigation of dynamic controllers for a unified power flo...

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International Conference on Industrial electronics, Control and Instrumentation

作者： Qing Yu L. Norum T. Undeland S. Round Faculty of Electrical Engineering and computer science Norwegian University of Science and Technology Trondheim Norway Department of Electrical and Electronic Engineering University of Canterbury Christchurch New Zealand

In this paper, a unified power flow controller (UPFC) model based on a d-q rotating frame is introduced The performance of the UPFC system with three different controllers, PI controller, PI controller with decoupling and cross-coupling controller, are investigated through simulation and implementation in an experimental laboratory model. It is found that the cross-coupling controller produces the best performance when the transmission line parameters are unknown. Furthermore the measures implemented to reduce the interaction between the series and shunt inverters an also introduced.

关键词： Load flow Inverters Control systems Power system modeling Power transmission lines Reactive power Transmission line theory Power electronics Voltage control Power system reliability

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Communication system among Petri net controllers

Communication system among Petri net controllers

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IEEE International Conference on Industrial technology (ICIT)

作者： Y. Dohi Y. Sasagawa H. Murakoshi Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Yokohama Japan Department of Electronic Systems Engineering Tokyo Metropolitan Institute of Technology Hino Tokyo Japan

We propose a programmable controller based on Petri net which describes the status of a whole system, the controller and the controlled object. Since the Petri net controller can be made up on one chip VLSI package, it is difficult to deal with a large Petri net. To solve the problem we propose here a method to divide a large Petri net into several smaller nets and communication systems among these controllers to perform a whole Petri net cooperatively. The communication uses bus connection for the simplicity of hardware and partly one-to-one connection for faster speed.

关键词： Communication system control Control systems Programmable control Proportional control Communication systems Very large scale integration Packaging Fires technology management engineering management

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Test processor ASIC design

Test processor ASIC design

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IEEE International Conference on Semiconductor electronics (ICSE)

作者： L. Ali Z.M. Darus M.A.M. Ali I. Ahmed Dept. of Electr. Electron. & Syst. Eng. Univ. Kebangsaan Malaysia Department of Electrical Electronic and Systems Engineering Universiti Kebangsaan Malaysia Malaysia Faculty of Computer Science and Information Technology University of Malaya Malaysia

In this paper, a design of a test processor ASIC employing a probabilistic approach is presented. The test processor chip is computer programmable. It consists of linear feedback shift register (LFSR) which can select one of 16 polynomials and set user programmable need for every test set, signature analyzer and 3 built-in RAMs and other control circuitry. It is capable of generating random numbers and applying them to the circuit under test (CUT) and then retrieve the responses from the CUT. It can generate a signature by compressing the response data and detect circuit faults by comparing this signature with that of a good CUT. This ASIC can be used to design a low cost IC tester of reliable performance.

关键词： Application specific integrated circuits Process design Circuit testing Linear feedback shift registers Polynomials Linear feedback control systems Feedback circuits Random number generation Electrical fault detection Fault detection

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A method for understanding intentions of indirect speech acts in natural language interfaces

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SYSTEMS AND computerS IN JAPAN 1996年第1期27卷 77-91页

作者： Mima, H Aoe, J Fuketa, M Hayashi, Y Member Faculty of Engineering The University of Tokushima Tokushima Japan 770 Jun-ichi Aoe received his B.E. and M.E. degrees in Electronic Engineering from the University of Tokushima Tokushima Japan in 1974 and 1976 respectively and his Ph.D. degree in Communication Engineering from the University of Osaka Japan in 1980. Since 1976 he has been with the University of Tokushima. He is currently a Professor in the Department of Information Science and Intelligent Systems at the University of Tokushima. He is the author of about 50 scientific papers. His research interests include computer algorithms in software engineering and natural language processing. Dr. Aoe is editing Computer Algorithms Series of the IEEE Computer Society Press and author of two books: Computer Algorithms-Key Search Strategies in 1991 and String Pattern Matching Strategies in 1994. He received a Best Author Award from the Information Processing Society of Japan in 1993. He is a member of the Association for Computing Machinery the American Association for Artificial Intelligence the Association for Computational Linguistics and the Information Processing Society of Japan the Society for Software Science and Technology the Japanese Society for Artificial Intelligence and the Association for Natural Language Processing of Japan. Nonmember

In an attempt to propose a robust method for understanding natural language (NL) interface commands, a scheme is proposed that infers intentions from an indirect speech-act that does not express users' real intentions explicitly. This method classifies the real intentions of the indirect speech-act into: 1) refusal;2) reversal;3) restriction;4) benefit;and 5) disability. Further, concepts are abstracted for operations, e.g., displaying, moving, and deleting information systems;and constructing the operation knowledge base. This knowledge based comprises operational concepts and the relationships between them. These relationships are assigned the foregoing classifications for intentions. In addition, we construct the knowledge base of objects for the target of operations, e.g., files, figures, strings. This knowledge base contains the relationships: a) antonym;b) exclusive;c) part-of, between the objects;and uses these relations to infer the transitions between the objects. An algorithm is the proposed to infer concepts for operations and concepts for target objects of operations that may represent the user's actual intentions. This proposal scheme was tested with requests on UNIX and a commercially available Japanese Word Processor. The system successfully inferred the intentions for approximately 80 percent of the user's indirect speech-act.

关键词： natural language interface indirect speech act inference of intention

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A finite-element beam-propagation method for strongly guiding optical waveguides with magnetooptic materials

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electronicS AND COMMUNICATIONS IN JAPAN PART II-electronicS 1996年第7期79卷 22-29页

作者： Tsuji, Y Koshiba, M Tanabe, T Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated in 1991 from the Department of Electronic Engineering Hokkaido University and received his M.S. degree in 1993. He is currently working toward a doctoral degree. He has been engaged in research on the computer-aided design of optical and quantum-wave phenomena and quantum-effect devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University and received his M.S. and Dr. of Eng. degree in 1973 and 1976 respectively. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor in the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave-electronics. In 1987 he received a Best Paper Award. He is the author ofFoundations of Finite Element Method for Opto- and Wave-Electronics(Morikita Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He has co-authored one book and written Graduated in 1995 from the Department of Electronic Engineering Hokkaido University and is currently in the Master's program. He has been engaged in research on opto- and wave-electronics.

To the best of the knowledge of the authors, the formulation is carried out for the first time on the finite-element beam-propagation method for the analysis of the magnetooptic waveguide in which the structure varies along the propagation direction. The present method is applicable not only to the case in which refractive index difference is small but also to the case for the TE mode and the TM mode propagating in a waveguide with a large refractive index difference. To suppress the spurious reflection from the computational window edges, the transparent boundary condition is applied.

关键词： seam-propagation method finite-element method magnetooptical material optical isolator

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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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electronicS AND COMMUNICATIONS IN JAPAN PART II-electronicS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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A 32-bit GaAs IEEE floating point multiplier using Trailing-1's rounding algorithm

A 32-bit GaAs IEEE floating point multiplier using Trailing-...

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1995 IEEE Conference on electronic technology Directions to the Year 2000, ETD 1995

作者： Cui, S. Burgess, N. Liebelt, M. Eshraghian, K. Department of Electrical and Electronic Engineering University of Adelaide SA5005 Australia Dept of Electronics Computer and Communication Engineering Faculty of Science and Technology Edith Cowan University WA6027 Australia

ISBN: (纸本)0818670851

The paper presents a GaAs 32-bit IEEE floating point multiplier. A modified carry save array is used in conjunction with Booth's algorithm to reduce the partial product addition and interconnection. A special rounding technique called Trailing-1's Predictor is used to speed up the final addition and rounding. This chip uses a new layout methodology for easy design structure and improved GaAs technology layout density. The combination of the fast arithmetic architecture and compact layout style achieves 4ns multiplication time with 3.5 W power dissipation at 75°C. The area is 2.43 mm by 3.77 mm (excluding pads) and uses 28000 transistors to give a density of 3056 transistors/mm2 for 0.8μm GaAs technology. © 1995 IEEE.

关键词： Gallium arsenide

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Nonlinear robust control for robot compliant manipulation on dynamic environments

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Advanced Robotics 1995年第2期10卷 213-227页

作者： Luo, Zhi-Wei Ito, Masami Ito, Koji Kato, Atsuo Bio-Mimetic Control Research Center The Institute of Physical and Chemical Research Nagoya 456 8-31 Rokuban 3-chome Atsuta-ku Japan Department of Electric Engineering Faculty of Engineering Chubu University Kasugai 487 1200 Matsumoto-cho Japan Department of Electronic Engineering Aichi Institute of Technology Toyota 470-03 1247 Yakusa-cho Japan Department of Information and Computer Sciences Toyohashi University of Technology Tempaku-cho Toyohashi 441 Japan

This paper investigates how to control a robot manipulator, which has model uncertainties, to perform contact tasks upon an uncertain dynamic environment. In order to perform the contact tasks successfully, the robot control system has to adjust its frequency bandwidth with respect to the dynamics of its environment. In this paper, we will present a nonlinear robust model matching control approach. We first consider the environment uncertainties and propose a nonlinear method to adjust the frequency bandwidth of the reference model as well as the robot’s position controller based on the information of the interaction force, such that the robot maintains contact with its real environment. We then consider the robot’s model uncertainties and apply the nonlinear robust control theory, such that the robot control system matches the reference model, robustly. This approach measures the interaction force to adjust the robot’s position controller and eliminates the construction of a complex force feedback compensator. Experiments of a robot, with 1 d.o.f., pushing a dynamic object have been performed to show the effectiveness of this approach. © VSP and Robotics Society of Japan 1996.

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