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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Hyodo A. Kyura S. Ueno Department of Computer Science and Communication Engineering Kyushu University Fukuoka Japan Institute of Medical Electronics Faculty of Medicine University of Tokyo Tokyo Japan

This paper focuses on the refractory period of the nerve fibers in train-pulsed magnetic nerve stimulation. We simulated nerve excitation elicited by a train of pulsed magnetic stimulation using a figure-of-eight coil. We used the parameters of the Frankenhaeuser-Huxley model. The simulation suggests that the refractory period is reduced with the increase of pulsed current flowing in a stimulating coil.< >

关键词： Coils Nerve fibers Magnetic stimulation

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NUMERICAL ANALYSIS OF ASYMMETRIC Y-BRANCHING OPTICAL WAVEGUIDE WITH REFRACTION-INDUCING WEDGE

NUMERICAL ANALYSIS OF ASYMMETRIC Y-BRANCHING OPTICAL WAVEGUI...

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The 1994 International Conference on Computational Electromagnetics and Its Applications

作者： Kiyotoshi YASUMOTO Yuji HIDAKA Milo Puchta Department of Computer Science and Communication Engineering Kyushu University 36 Fukuoka 812 Japan Department of Computer Science and Communication Engineering Kyushu University 36 Fukuoka 812 Japan Central Department of Scientific Information of Charles University Faculty of Education M.D. Rettigove 4 116 39 Prague Czech Republic

A novel structure of asymmetric Y-branching optical waveguide is proposed, which has a refraction-inducing wedge and a notch region in the branching section. The transmission characteristics of the proposed Y-branch are numerically analyzed using the beam propagation method based on the finite difference scheme (FD-BPM). It is shown that the asymmetric Y-branch can achieve a required power dividing ratio, by adjusting the wedge angle or the increment of refractive index of wedge area.

关键词： NUMERICAL ANALYSIS OF ASYMMETRIC Y-BRANCHING OPTICAL WAVEGUIDE WITH REFRACTION-INDUCING WEDGE

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Effect of magnetic fields on the enzymatic activity of plasmin

Effect of magnetic fields on the enzymatic activity of plasm...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Iwasaka S. Ueno H. Tsuda Dept. of Comput. Sci. & Commun. Eng. Kyushu Univ. Fukuoka Japan Department of Computer Science and Communication Engineering Faculty of Engineering Kyushu University Fukuoka Japan Institute of Medical Electronics Faculty of Medicine University of Tokyo Tokyo Japan Clinical Laboratory Kyushu University Hospital Kyushu University Fukuoka Japan

The authors investigated the effect of magnetic fields on the enzymatic activity of plasmin concerning the dissolution of thrombus. Plasmin activity in magnetic fields up to 8 T was assessed using a synthetic substrate for plasmin, D-Val-Leu-Lys-pNA. After 40 min or more incubation, absorbance of the mixture exposed to an 8 T magnetic field at 37/spl deg/C was 7-11% lower than control sample. The results show that the enzymatic activity of plasmin was affected by a magnetic field at 8 T. This suggests that magnetic fields have an effect on the active center of the enzymatic reaction of plasmin with a substrate, especially on the hydrogen bonds of the charge-relay system.< >

关键词： Magnetic field measurement Magnetic fields Superconducting magnets Biomedical engineering Degradation computer science Laboratories Hospitals Hydrogen Amino acids

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NUMERICAL-METHOD FOR CALCULATING SURFACE CURRENT-DENSITY ON 3-DIMENSIONAL SMOOTH SCATTERERS

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ELECTRONICS AND communicationS IN JAPAN PART II-ELECTRONICS 1994年第2期77卷 1-11页

作者： IKUNO, H GONDO, M NISHIMOTO, M Faculty of Engineering Kumamoto University Kumamoto Japan 860 Himyoshi Ikmo received his B.E. M.E. and Ph.D. from Kyushu University in 1962 1964 and 1979 respectively. From 1967 to 1970 he was a Research Associate in Computer Science and Communication Engineering at Kyushu University. He joined the Department of Electrical Engineering and Computer Science of Kumamoto University in 1970 and is currently a Professor there. During 1983 to 1984 he was a Visiting Professor at the Polytechnic University Brooklyn NY. His research interests are in the areas of scattering diffraction and wave propagation in the theory of electromagnetics. Dr. Ikuno is a member of IEEE and IEE of Japan. Michim Gondo graduated from National Defense Academy Yokosuka in 1985 and received his M.E. from Kumamoto University in 1990. He is currently in the doctoral program at Kumamoto University. His research interest is in three-dimensional electromagnetic scattering. Masahiko Nkhimoto received his B.S. in Electronic Engineering from Kumamoto University in 1982 and an M.S. and Ph.D. from Kyushu University in 1984 and 1987 respectively. Since 1987 he has been a Research Associate in the Department of Electrical Engineering and Computer Science Kurnamoto University. His research interests are in the areas of scattering and diffraction of electromagnetic waves.

This paper shows that the surface current density can be calculated by using approximate total tangent magnetic vector fields which are expressed by finite number of linear combination of tangent vectors of spherical wave functions. Sampling points are determined by considering the property of associated Legendre functions and trigonometrical functions. By setting a number of sampling points to twice the largest mode number, a computer-aided algorithm is obtained. The accuracy of the solutions is checked and the polarization dependence of the surface current densities is clarified.

关键词： YASUURA METHOD 3-DIMENSIONAL PROBLEM BODY OF REVOLUTION LEAST-SQUARES PROBLEM

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MODELING AND CONTROL STRATEGIES FOR A VARIABLE RELUCTANCE DIRECT-DRIVE MOTOR

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 1993年第1期40卷 105-115页

作者： FILICORI, F LOBIANCO, CG TONIELLI, A Faculty of Engineering University of Ferrara Ferrara Italy Department of Electronics Computer and System Science (DEIS) University of Bologna Bologna Italy

In industrial automation and robotic applications, direct-drive motors represent a suitable solution to friction and backlash problems typical of mechanical reduction gears. Variable reluctance (VR) motors are well suited for direct-drive implementation but, because of the strongly nonlinear electromechanical characteristics, these motors are traditionally designed as stepper motors. The main aim of the work described in the paper is the design of a high-performance ripple-free dynamic torque controller for a VR motor, intended for trajectory tracking in robotic applications. An original modeling approach is investigated in order to simplify the design of the high-performance torque controller. Model structure and parameter estimation techniques are presented. Different approaches to the overall torque controller design problem are also discussed and the solution adopted is illustrated. A cascade controller structure is considered. It consists of a feedforward nonlinear torque compensator, cascaded to a nonlinear flux or current closed-loop controller. The feedforward compensator is carefully considered and optimization techniques are used for its design. Two optimization criteria are proposed: the first minimizes copper losses, whereas the second minimizes the maximum value of the motor-feeding voltage. Although developed for a specific commercial motor, the proposed modeling and optimization strategies can be used for other VR motors with magnetically decoupled phases, both rotating and linear. Laboratory experiments for model validation and preliminary simulation results of the overall torque control system are presented.

关键词： Reluctance motors Virtual reality Torque control Robots Trajectory Servomotors Robotics and automation Friction Gears Design optimization

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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

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INTERNATIONAL JOURNAL OF SATELLITE communicationS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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A systematic synthesis procedure for feedforward neural networks by using the GRBF (generalized radial basis function) network technique

A systematic synthesis procedure for feedforward neural netw...

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International Joint Conference on Neural Networks (IJCNN)

作者： A. Miyazaki T. Yamada Department of Computer Science and Communication Engineering Faculty of Engineering Kyushu University Fukuoka Japan

Some of the problems that one should first be able to address when developing a synthesis procedure for feedforward neural nets are considered to be the following: development of a systematic approach to the representation of neural networks, that is, choosing the number of hidden layers and the number of units in each hidden layer required to achieve a given level of performance in a given applications; and development of a systematic procedure for the learning of neural networks, that is, setting the weights of a feedforward neural network by using much of the information contained in a given set of examples of input-output pairs. This paper deals with the two problems above by using the GRBF (generalized radial basis function) network technique closely related to approximation techniques such as generalized splines and regularization theory, and aims to offer a framework within which it is possible to address the problems and provide a systematic synthesis procedure for feedforward neural networks.

关键词： Network synthesis Neural networks Feedforward neural networks Feedback loop Motion control Control systems computer science Speech recognition Pattern recognition Robot motion

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A time diversity CDMA scheme employing orthogonal modulation for time varying channels

A time diversity CDMA scheme employing orthogonal modulation...

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IEEE Conference on Vehicular Technology (VTC)

作者： S. Kubota S. Kato K. Feher NTT Radio Communication System Laboratories Yokosuka Japan Department of Electrical Engineering and Computer Science University of California Davis CA USA

In order to increase the channel capacity of CDMA (code division multiple access) mobile and personal communication systems, a new time diversity CDMA scheme that employs orthogonal modulation is proposed. The time diversity CDMA scheme with orthogonal modulation reduces the required Eb/(No+Io) by 5 dB at Pe = 10/sup -2/ in Rayleigh fading environments with fDT (the product of Doppler frequency and one symbol duration) values ranging from 0.002 to 0.02. This improvement in required Eb/(No+Io) significantly increases the channel capacity of CDMA communication systems that have time varying channels. computer simulation results show that the required time delay values of the time diversity scheme are resonably short (20-100 symbols for 10 kbps transmission) for fDT values ranging from 0.002 to 0.02.

关键词： Multiaccess communication Modulation coding Time varying systems Phase modulation Binary phase shift keying Channel capacity Quadrature phase shift keying AWGN Digital modulation Laboratories

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A continuous approach to robot motion planning with many degrees of freedom

A continuous approach to robot motion planning with many deg...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Hayashi, Akira Kuipers, Benjamin Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu Ilzuka820 Japan Department of Computer Sciences University of Texas at Austin AustinTX78712 United States

ISBN: (纸本)0780307372

There is a need for highly redundant manipulators to work in complex, cluttered environments. We explore kinematics and path planning for highly redundant, manipulators by means of a continuous manipulator model, which captures the macroscopic shape of highly redundant manipu-lators. A path for the continuous manipulator model can be found by finding a smooth path for its end-effector under a maximum curvature/torsion constraint. Free space decomposition into primary convex regions is suited to finding such smooth paths. On top of the free space representation, we have developed an algorithm to find a continuous curvature path in 2-D with a maximum curvature constraint. We report on an experiment conducted to measure the efficiency of the algorithm. The 2-D path planning algorithm could be used for path planning in 3-D space by restricting the manipulator movement. Alternatively, 3-D free space can be decomposed into primary convex regions. The path planning problem has been shown to be PSPACE-complete in terms of DOF of the manipulator. However, DOF of the manipulator is a resource to be utilized in our approach, because the error bound 011 the mapping improves with the number of DOF of the manipulator. © 1992 IEEE. All rights reserved.

关键词： Motion planning

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Tiny silent linear cybernetic actuator driven by piezoelectric device with electromagnetic clamp

Tiny silent linear cybernetic actuator driven by piezoelectr...

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IEEE International Conference on Micro Electro Mechanical systems

作者： K. Ikuta S. Aritomi T. Kabashima Department of Mechanical System Engineering Faculty of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Department of Mechanical System Engineering Engineering Faculty of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Yaskawa Electric Manufacturing Company Limited Kitakyushu Japan

A type of miniature linear actuators called a cybernetic actuator for biomedical applications is described. This actuator has four driving states: free, increasing, decreasing, and lock. The free and lock states can release excessive applied load from outside to provide safety characteristics for both human and micromechanisms. Miniaturized linear cybernetic actuators combining a piezoelectric impact drive with electromagnetic clamping were designed and developed. Feasibility and basic performance of the actuators were confirmed by theory and experiments. Improved performance in terms of maximum speed, energy efficiency, and silent drive as a miniature linear actuator were verified successfully by using a controlled friction impact drive.< >

关键词： Cybernetics Hydraulic actuators Piezoelectric actuators Piezoelectric devices Electromagnetic devices Clamps Safety Humans Friction Service robots

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