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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： A. Katsuki M. Ouchiyama M. Matsushima Department of Computer Science and Electronics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

Current-feedback magnetic multivibrators are widely used as power sources for electronic equipment, because they are highly efficient and reliable. However, these circuits have no ability to protect themselves from overloading, and the oscillation frequency changes according to the load current. In this paper, we propose a new current-feedback multivibrator with overload protection and frequency compensation. In addition, the condition for cessation of oscillation and that for fixed frequency of oscillation are derived by analysis. These conditions can be determined independently of each other.

关键词： Frequency Magnetic flux Power supplies Voltage Circuit noise Magnetic circuits Power system reliability Protection Saturation magnetization Magnetic noise

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Digital Adaptive Motion Control for a Servo Mechanism

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IFAC Proceedings Volumes 1997年第11期30卷 323-328页

作者： T. Suehiro F. Ohkawa T. Hokamura S. Sagara Electronics Division Mechanics & Electronics Research Institute Fukuoka Industrial Technology Center 3-6-1 Norimatsu. Yahatanishi-ku Kitakyushu-shi 807 Japan Department of Control Engineering and Science Faculty of Computer & System Engineering Kyushu Institute of Technology lizuka 820 Japan Department of Control Engineering Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804 Japan

This paper is concerned with an application of a digital adaptive control system to a servo mechanism. Mechanical systems in general include nonlinearities and additional uncertainties and which result from inertia and friction. So it is difficult to ensure robust performance and high accuracy for motion control. The digital adaptive control system presented here is considered to overcome the above stated problem. Experimental results from a feed drive system demonstrate the effectiveness of the proposed control scheme.

关键词： Adaptive Control Servomechanism Nonlinearity Uncertainty Friction

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Throughput analysis of selective cell discard schemes in transport layer over ATM networks

Throughput analysis of selective cell discard schemes in tra...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： N. Tsukutani K. Kawahara T. Takine H. Sunahara Y. Oie Information Network Department Takasago Works Hitachi Cable Limited Hitachi Japan Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Japan Department of Information Systems Engineering Osaka University Suita Japan Information Technology Center Nara Institute of Science and Technology Ikoma Japan

In transport layer protocols over ATM networks, a packet is discarded when one or more cells are lost in that packet, and the destination node then requires its source to retransmit the corrupted packet. Therefore, once one of cells constituting a packet is lost, its subsequent cells of the corrupted packet waste network resources. In this paper, we propose the throughput analysis in transport layer with selective cell discard schemes and selective repeat ARQ. In the analysis, we suppose that sources steadily generate cells due to the packet retransmission; the resulting state will be referred to as source saturation, which makes the analysis very tractable from a computational point of view. Through some numerical results, we can clarify the impacts of the average number of packet length, the buffer size and the number of sources on the throughput performance of selective cell discard schemes.

关键词： Throughput Intelligent networks Asynchronous transfer mode Switches Buffer overflow Degradation Communication system traffic control Traffic control Packet switching TCPIP

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A practical structural representation of a segmented image

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IEICE TRANSACTIONS ON INFORMATION AND systemS 1996年第6期E79D卷 873-880页

作者： He, SJ Abe, N Tan, CL Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka-shi 820 Japan

A practical structural representation of a segmented image is presented. The practicalness is defined according to whether or not: the representation can be directly generated from its corresponding segmented image. Two structural representations have been proposed in the literature. They are hierarchical structure and relational graph. Because they are defined totally on the basis of human perception, neither of the representations can be directly generated from the corresponding segmented image. The structural representation described in this paper, however, is based on the relations among pattern primitives and generated by applying some human-oriented constraints.

关键词： structural representation segmented image generalized connected component (GCC's)

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Linear complexity of periodic sequences obtained from GF(q) sequences with period q(n)-1 by one-symbol insertion

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND computer scienceS 1996年第10期E79A卷 1739-1740页

作者： Uehara, S Imamura, K Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka-shi 820 Japan

From a GF(q) sequence {a(i)}(i greater than or equal to 0) with period q(n)-1 we can obtain new periodic sequences {(a) over cap(i)$}(i greater than or equal to 0) with period q(n) by inserting one symbol b is an element of GF(q) al the end of each period. Let b(0) = Sigma(i=0)(qn-2) a(i). It is first shown that the linear complexity of {<(a)over cap(i)>}(i greater than or equal to 0), denoted as LC({(a) over cap(i)$}), satisfies LC({(a) over cap(i)$}) = q(n) if b not equal -b(0) and LC({(a) over cap(i)$}) less than or equal to q(n)-1 if b = -b(0). Most of known sequences are shown to satisfy the zero sum property i.e., b(0) = 0. For such sequences satisfying b(0) = 0 it is shown that q(n)-LC({a(i)}) less than or equal to LC({(a) over cap(i)$}) less than or equal to q(n)-1 if b = 0.

关键词： linear complexity GF(q) sequences with period q(n)-1 one-symbol insertion zero sum property

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Prediction of time series by a structural learning of neural networks

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FUZZY SETS AND systemS 1996年第2期82卷 167-176页

作者： Ishikawa, M Moriyama, T Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820 Japan

There have been numerous methods for learning and predicting time series ranging from the traditional time-series analyses to recent approaches using neural networks. A central issue common to all of them is the determination of model structure. Both mean prediction error and An Information Criterion (AIC) are useful in model selection;the model with the smallest mean prediction error or AIC is selected from among a set of models as the best one. In this way they give a solution to the problem of model selection. Due to huge search space, however, the mean prediction error or AIC alone is not powerful enough to find the best model structure from among all the candidates. In the present paper the authors propose to use both a structural learning with forgetting and the mean prediction error or AIC to find a model with better generalization ability. Jordan networks and buffer networks, popular in the modeling of time series, are examined in this paper. The structural learning with forgetting and backpropagation (BP) learning are applied to compare the learning and prediction performance of these two types of models. Simulation results demonstrate that the structural learning with forgetting has better generalization ability than BP learning both in Jordan networks and buffer networks.

关键词： neural networks model selection learning time series prediction

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Structural and functional conservation of human and yeast HCP1 genes which can suppress the growth defect of the Saccharomyces cerevisiae ire15 mutant

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GENE 1996年第1期171卷 107-111页

作者： Nikawa, J Nakano, H Ohi, N Department of Biochemical Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

The Saccharomyces cerevisiae ire15 mutant has a defect in the expression of the INO1 gene, showing an inositol auxotrophic phenotype. The growth defect of this mutant is suppressed by human cDNAs such as for the TGF-beta receptor-encoding gene (TGFR) [Nikawa, Gene 149 (1994) 367-372]. Here, we isolated a new human cDNA, HCP1, which suppresses the ire15 mutation by genetic complementation. Sequencing analysis revealed that HCP1 encodes 360 amino acid residues (40515 Da). The product of HCP1 is highly conserved among species and the yeast homolog was also found to suppress the ire15 mutation. Northern blot analysis revealed that multicopies of the yeast and human HCP1, as well as TGFR, resulted in an increase in the INO1 mRNA level in the yeast mutant. These results clearly indicate that the products of human and yeast HCP1 are structural and functional homologs, and are involved in expression of genes such as of INO1.

关键词： human cDNA inositol TGF-beta receptor complementation sequence analysis

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Silicon implementation of a fuzzy neuron

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IEEE TRANSACTIONS ON FUZZY systemS 1996年第4期4卷 488-501页

作者： Yamakawa, T Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

This paper describes a fuzzy neuron chip which is the modification of an ordinary neuron model by fuzzy logic, The algebraic product of scalar input and connective weights in synapse is replaced with a fuzzy inner product. An excitatory connection is represented by a MIN (minimum) operation and an inhibitory connection by fuzzy logic complement followed by a MIN operation;While an ordinary neuron model is established only by leaning, the fuzzy neuron is designable and optimized by learning, The fuzzy neuron is implemented in silicon wafer by a standard BICMOS process. The chip is applied to a handwritten character recognition system and it exhibits very high-speed recognition (less than 500 ns).

关键词： Silicon Neurons Fuzzy logic Fuzzy systems Semiconductor device modeling Character recognition Design optimization BiCMOS integrated circuits Handwriting recognition Fuzzy sets

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Performance comparison of fixed and dynamic channel assignments in indoor cellular system (Reprinted from IEEE, Proceedings of Vehicular technology Conference, Atlanta, April 28 May 1, 1996, pg 928-932)

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IEICE TRANSACTIONS ON COMMUNICATIONS 1996年第9期E79B卷 1295-1300页

作者： Furukawa, H Oishi, M Akaiwa, Y Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology lizukashi 820 Japan

This paper compares the performance of an indoor cellular system in terms of capacity and channel assignment delay for different Dynamic Channel Assignment (DCA) and Fixed Channel Assignment (FCA) schemes. We refer to specific group of DCAs, namely Channel Segregation and Reuse Partitioning (RP). Our main concern is to show that these DCA schemes offer better performance than FCA. Since the structure and floor layout of a building will have a major influence on the propagation and hence on the cell shape, a path loss simulator is developed for predicting the path loss which is used in evolving base station layouts. computer simulation, based on Monte Carlo method, is carried out using the path loss values and the base station layouts. The results indicate that increased traffic capacity can be achieved with ail DCAs in comparison with FCA. The highest capacity and a shorter channel assignment delay are delivered by Self-Organized Reuse Partitioning DCA scheme.

关键词： mobile communication dynamic channel assignment indoor cellular

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Computing 3D models of rotating objects from moving shading

Computing 3D models of rotating objects from moving shading

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13th International Conference on Pattern Recognition, ICPR 1996

作者： Zheng, Jiang Yu Kakinoki, Hiroshi Tanaka, Kazuaki Abe, Norihiro Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

ISBN: (纸本)081867282X

This work reconstructs 3D graphics model of an object from an image sequence taken during the object rotation. Shading and its motion information are used in estimating shapes of smooth surfaces between fixed edges from corners and patterns. Being different from conventional shape from shadings that use one or several images, we use an image sequence that provides not only shading but also its motion. Maximum diffused shading moving on surfaces is followed at each rotation plane and surface normals are obtained. Positions of points are estimated from moving shading using motion stereo principle. It is linear equations directly achieving the results rather than iterative computation in shape from shading using complex approximation. © 1996 IEEE.

关键词： Three dimensional computer graphics

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