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A cross-coupled type AC-DC converter for remote power feeding to a RFID tag

WSEAS Transactions on Circuits and Systems 2007年第11期6卷 592-599页

作者： Eguchi, Kei Inoue, Takahiro Oota, Ichirou Zhu, Hongbing Ueno, Fumio Shizuoka University Department of Technology Education 836 Ohya Shizuoka 422-8529 Japan Kumamoto University Department of Electrical and Computer Engineering 2-40-1 Kurokami Kumamoto 860-8555 Japan Kumamoto National College of Techology Department of Information and Communication 2659-2 Suya Koushi Kumamoto 861-1102 Japan Hiroshima Kokusai Gakuin University Department of Computer Science 6-20-1 Nakano Akiku Hiroshima 739-0321 Japan Sojo University Department of Software Science 4-22-1 Ikeda Kumamoto 860-0082 Japan

In this paper, a cross-coupled type AC-DC converter for RFID tags is proposed. The converter consists of 2 charge-pump type AC-DC converters with opposite polarities. In conventional converters, the threshold voltage of a diode switch causes the decrease in power efficiency. By using cross-coupled connection of CMOS switches, the proposed converter can alleviate the influence of the threshold voltage. Hence, it can achieve an AC-DC conversion with high efficiency. Furthermore, the circuit size of the proposed converter is almost the same as that of the conventional circuit. Through SPICE simulations, the following characteristics are obtained: 1. the power efficiency is more than 88 % and 2. the electric power is about 5mW when an output load is 500 Ω. Concerning the power efficiency and the ripple voltage, theoretical design formulas are derived. Furthermore, the validity of the circuit design is confirmed by experiments.

关键词： Power converters

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Quantum entanglement, non-locality and secure computation

Quantum entanglement, non-locality and secure computation

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First International Conference on Quantum, Nano, and Micro Technologies, ICQNM 2007

作者： Chou, Yao-Hsin Tsait, I.-Ming Fahn, Chin-Shyurng Horng, Shi-Jinn Kuo, Sy-Yen Department of Computer Science and Information Engineering National Taiwan University of Science and Technology No. 43 Keelung Rd. Taipei 106 Taiwan Department of Electrical Engineering National Taiwan University No. 1 Roosevelt Rd. Taipei 106 Taiwan

ISBN: (纸本)0769527590

In this paper, we demonstrate that nanoscale phenomenon can be applied not only in device level but also in high layer applications, such as secure computation. We study the possibility of performing secure computation by building non-local machines based on quantum entanglement and nonlocality, which are phenomena available only at the nanometer scale. Comparing with classical secure computation algorithms, the security of this protocol is based on physical laws, instead of any unproven mathematic conjecture. © 2007 IEEE.

关键词： Quantum cryptography

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VPN based data acquisition system for KASKA prototype detector

VPN based data acquisition system for KASKA prototype detect...

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2007 15th IEEE-NPSS Real-Time Conference, RT

作者： Sakamoto, Y. Furuta, H. Tabata, H. Suekane, F. Nagasaka, Y. Department of Information Science Faculty of Liberal Arts Tohoku Gakuin University Tenjinsawa 2-1-1 Izumiku Sendai 981-3193 Japan Department of Physics Graduate School of Science and Engineering Tokyo Institute of Technology Department of Physics Graduate School of Science Tohoku University Research Center for Neutrino Science Tohoku University Department of Computer Science Faculty of Applied Information Science Hiroshima Institute of Technology

ISBN: (纸本)1424408679

KASKA is a Japanese neutrino oscillation experiment to measure the neutrino mixing angle 813 by using reactor neutrinos. This collaboration had conducted studies for the actual experiment till recently, march of 2007. As one of the studies, a prototype detector had been constructed and that is used for various studies. As almost of the prototype studies have been finished, we decided to do a trial to detect actual neutrino events at the experimental fast reactor JOYO by using the prototype detector. To detect a neutrino event from a fast reactor is experimental attempt. This paper describes briefly a present status of the experiment in focusing to the outline of DAQ, monitoring system and controlling system used there. © 2007 IEEE.

关键词： Fast reactors

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Neuro-fuzzy sliding mode control applied to the field-oriented control of an induction motor

Neuro-fuzzy sliding mode control applied to the field-orient...

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作者： Barazane, L. Khwaldeh, A. Jumah, M. El-Qawasmeh, E. Faculty of Electronic and Computing BP 32 El-Alia Bab-Ezzouar 16111 Algiers Algeria Department of Computer Sciences Engineering Faculty of Engineering Philadelphia University P. O. Box 1 Amman 19392 Jordan Department of Mechatronics Engineering Faculty of Engineering Philadelphia University P. O. Box 1 Amman 19392 Jordan Computer Science Dept. Faculty of Computer and Information Technology Jordan University of Science and Technology Irbid Jordan

The aim of this paper consists in using one of the emergent techniques which proves its capability of improving performances of several systems, called "neuro-fuzzy", in order to reduce the chattering phenomenon and also to perform the control obtained with fuzzy sliding mode control. In fact, after determining the decoupled model of the motor, a set of simple surfaces and associated a smooth control function with a threshold have been synthesized. However, the magnitude of this control function depends closely on the upper bound of uncertainties, which include parameter variations and external disturbances, and this generates chattering. Usually, the upper bound of uncertainties is difficult to be known before motor operation, so a fuzzy sliding mode controller is investigated to solve this difficulty and in which a simple fuzzy inference mechanism is used to reduce the chattering phenomenon by simple adjustments. In order to optimize the control performances and ensure a significant reduction of chattering compare with ones obtained in the previous fuzzy sliding mode, we propose in this paper to use adaptive predictive neural approach to regulate the speed of the motor. The neural control algorithm is provided with the predicted system output which is the speed variable via a recursive on line identification of the overall system which is based on a static feed forward linear network with one hidden layer. The predicted data are passed to a numerical optimization algorithm which attempts to minimize a quadratic performance criterion to compute the suitable control signal. © ICS AS CR 2007.

关键词： Induction motors

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Adaptive laser range scanning

Adaptive laser range scanning

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2007 IEEE International Workshop on Robotic and Sensor Environments, ROSE 2007

作者： MacKinnon, D. Aitken, V. Biais, F. Picard, M. Department of Systems and Computer Engineering Carleton University Ottawa ON K1S 5B6 Canada Institute for Information Technology National Research Council of Canada Ottawa ON K1A 0R6 Canada

ISBN: (纸本)1424415276

We present an approach to laser range scanning in which quality metrics are used to automatically reduce the number of measurements acquired from a scanner viewpoint. As part of this approach we present improved versions of the orientation, and reflectivity quality metrics, as well as introduce three quality metrics: spot size, resolvability, and planarity. These quality metrics are used to divide the total field of view from a scanner viewpoint into regions. A subset of these regions is then automatically identified as having a significant likelihood of producing useful measurements to augment the initial range image using quality metrics. The composite range image is then automatically generated from the initial scan and series of targeted subscans. © 2007 IEEE.

关键词： Scanning

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Recognition of hand raising gestures for a remote learning application

Recognition of hand raising gestures for a remote learning a...

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8th International Workshop on Image Analysis for Multimedia Interactive Services, WIAMIS 2007

作者： Kapralos, Bill Hogue, Andrew Sabri, Hamed Faculy of Business and Information Technology University of Ontario Institute of Technology Oshawa ON L1H 7K4 Canada Department of Computer Science and Engineering Centre for Vision Research York University Toronto ON M3J 1P3 Canada

ISBN: (纸本)076952818X

A central technical issue in developing synchronous distance learning technology is enabling the remote class and the instructor to interact with each other. Issues such as "how does a student capture the instructor's attention?", "how can the instructor select one student to converse with?", and "how can the instructor attend to the student once (s)he has been selected?" are complex problems that must be addressed if the class and instructor are to interact in an effective manner. This paper describes the use of Hidden Markov Models for the recognition of students signaling their intent to interact with the instructor using "traditional" classroom hand gestures such as raising and waving hand motions. Hand raising gestures are detected using motion cues over a sequence of omni-directional images using a set of pre-defined Hidden Markov Models. © 2007 IEEE.

关键词： Students

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Lower and upper approximations in data tables containing possibilistic information

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作者： Nakata, Michinori Sakai, Hiroshi Faculty of Management and Information Science Josai International University 1 Gumyo Togane Chiba 283-8555 Japan Department of Mathematics and Computer Aided Sciences Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804-8550 Japan

ISBN: (纸本)9783540716624

An extended method of rough sets, called a method of weighted equivalence classes, is applied to a data table containing imprecise values expressed in a possibility distribution. An indiscerniblity degree between objects is calculated. A family of weighted equivalence classes is obtained via indiscernible classes from a binary relation for indiscernibility between objects. Each equivalence class in the family is accompanied by a possibilistic degree to which it is an actual one. By using the family of weighted equivalence classes we derive a lower approximation and an upper approximation. These approximations coincide with those obtained from methods of possible worlds. Therefore, the method of weighted equivalence classes is justified. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Approximation theory

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Molecular dynamics analysis on initial texture and processing route influences on grain refinement behavior of α-Fe by equal channel angular pressing

Molecular dynamics analysis on initial texture and processin...

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作者： Matsumoto, Ryosuke Hayashida, Toshio Nakagaki, Michihiko Department of Engineering Mechanics and Science Graduate School of Engineering Kyoto University Yoshida-honmachi Kyoto-City Kyoto-Fu 606-8501 Japan Graduate School of Computer Science and Systems Engineering Department of Information Systems Kyushu Institute of Technology 680-4 Kawazu Lizuka-City Fukuoka-Ken 820-8502 Japan Kyushu Institute of Technology 1-1 Sensui-Cho Fukuoka-Ken 804-8550 Japan

Fine-grained polycrystalline metals have a very high yield stress and excellent workability. Hence, numerous researchers are trying to develop an efficient process to obtain such materials. Our goal is to develop an efficient severe plastic deformation (SPD) process through investigating grain-refinement mechanisms in Equal Channel Angular Pressing (ECAP). In this paper, a series of molecular dynamics (MD) simulations of severe simple-shear deformations, which are ideally equivalent to SPD applied by typical ECAP processing routes, is performed using three-dimensional models that are thin and have a square shape with a periodic-boundary condition. We analyze the influences of the processing route and initial texture on the microstructural evolution. It is shown that twinning deformations are dominant under the calculated conditions, and that the structural evolution is notably affected by the relationship between the applied simple-shear direction and the characteristic crystal orientation, which can easily cause a twinning deformation. We conclude that Route A, without a rotation of the billet between processes, is the most efficient route. This is because twinning deformations along the simple-shear direction interact with the twin boundaries developed by the stress-component conjugate to the simple-shear. Furthermore, we demonstrate that the influence of the initial texture difference remains in force during multiple processes that have the same sliding plane.

关键词： Iron

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Molecular dynamics analysis on crack growth behavior in single and nano-crystalline Fe by the use of FS-2NNMEAM hybrid potential

Molecular dynamics analysis on crack growth behavior in sing...

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作者： Kubota, Yoshihiro Matsumoto, Ryosuke Nakagaki, Michihiko Graduate School of Computer Science and Systems Engineering Department of Information Systems Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka-Ken 820-8502 Japan Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Yoshida-honmachi Kyoto-City Kyoto-Fu 606-8501 Japan Kyushu Institute of Technology 1-1 Sensui-Cho Fukuoka-Ken 804-8550 Japan

In recent years, nano-crystalline materials have attracted many researchers' attention, but the fracture mechanism has not been fully clarified. In a molecular dynamics (MD) simulation, grain size and crystal orientation can be chosen, and their effects on the mechanical properties of nano-crystalline materials can be evaluated clearly. This research first compares the results of crack growth behavior in single crystalline Fe for three typical interatomic potentials (Embedded Atom Method (EAM), Finnis Sinclair (FS), and Second Nearest Neighbor Modified EAM (2NNMEAM) potentials) and a Hybrid potential method, which uses FS potential for bcc structure atoms and 2NNMEAM potential for non-bcc structure atoms. The 2NNMEAM potential is accurate, but the computation time is dozens of times that of FS potential, which is the simplest of the three interatomic potentials. Therefore, the 2NNMEAM potential requires too much calculation for the purpose of this research that analyzes the crack growth behavior in nano-crystalline metals. However, Hybrid potential is able to give results similar to those of the 2NNMEAM potential, and the calculation time is close to that of the FS potential. From these results, the crack extension behavior in relatively large nano-crystalline models is analyzed using the Hybrid potential, and we demonstrate the grain-size dependency of the fracture behavior.

关键词： Iron

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Adaptive particle swarm optimizer with nonextensive schedule 07

Adaptive particle swarm optimizer with nonextensive schedule

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9th Annual Genetic and Evolutionary Computation Conference, GECCO 2007

作者： Anastasiadis, Aristoklis D. Georgoulas, George Magoulas, George Tzes, Anthony School of Computer Science and Information Systems Birkbeck College University of London WC1E 7HX United Kingdom School of Electrical and Computer Eng. Georgia Institute of Technology Atlanta GA 30332 United States University of Patras Electrical and Computer Engineering Department Rio Achaia 26500 Greece

ISBN: (纸本)1595936971

This paper introduces a class of adaptive particle swarm optimization (PSO) methods that build on the theory of nonextensive statistical mechanics. These methods combine the traditional position update rule with an annealing schedule that is based on the nonextensive entropy. Comparative experiments conducted on benchmark functions, have showed that the tested algorithms outperform the standard PSO.

关键词： Global optimization

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