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Some optical and quasi-optimal binary codes from cyclic codes over GF (2(m))

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND computer scienceS 1996年第10期E79A卷 1737-1738页

作者： Sakakibara, K Kasahara, M Yuba, Y Faculty of Computer Science and System Engineering Okayama Prefectural University Soja-shi 719-11 Japan Faculty of Engineering and Design Kyoto Institute of Technology Kyoto-shi 606 Japan

It is shown that five optimal and one quasi-optimal binary codes with respect to the Griesmer bound can be obtained from cyclic codes over GF(2(m)). An [m(2(em)-1), em, 2(em-1)m] code, a [3(2(2e)-1), 2e, 3 . 2(2e-1)] code, a [2(2(2e)-1), 2, (2(2e+2)-4)/3] code, a [3(2(2e)-1), 2, 2(2e+1)-2] code, and a [3(2(2e)-1), 2(e+1), 3 . 2(2e-1)-2] code are optimal and a [2(2(2e)-1)2(e+1), 2(2e)-2] code is quasi-optimal.

关键词： optimal binary codes binary image of cyclic codes Griesmer bound concatenated structure

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Matched design method for concatenated trellis-coded modulation

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND computer scienceS 1996年第11期E79A卷 1911-1917页

作者： Wadayama, T Wakasugi, K Kasahara, M Faculty of Computer Science and System Engineering Okayama Prefectural University Soja-shi 719-11 Japan Department of Electronics and Information Science Kyoto Institute of Technology Kyotoshi 606 Japan

A new design method, which is referred to as the matched design method, for concatenated trellis-coded modulation (TCM) is presented. Most of the conventional concatenated TCM employs TCM designed to maximize the minimum squared Euclidean free distance, d(free)(2). With the matched design method, we maximize d(1)(2)(t) instead of d(free)(2), where d(1)(2)(t) is the effective minimum squared Euclidean distance (MSED) when the outer code has a t-error correcting capability. The effective MSED is derived from the Euclidean/Hamming (E/H) joint weight distribution of terminated TCM. We here assume the concatenated TCM whose transmitted symbol corresponds to a symbol of outer code. The new classes of 2-dimensional(2D) and 4-dimensional(4D) codes are found by a computer search. Under the performance measures of the effective MSED or the effective multiplicity, these codes are superior to the conventional codes such as the Ungerboeck's 2D-codes when those are used as an inner code. We disclose an interesting fact that the new class of codes using rate-1/2 encoder is superior to the class of codes using rate-2/3 encoder. This fact implies that the codes using rate-1/2 encoder have two advantages: 1) better overall decoding performance and 2) less decoding complexity.

关键词： trellis-coded modulation concatenated code weight distribution

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Robust Fault Detection Using Index of Kullback Discrimination Information

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IFAC Proceedings Volumes 1996年第1期29卷 6524-6529页

作者： K. Kumamaru J. Hu K. Inoue T. Söderström Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Fukuoka Japan. Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper presents a robust fault detection system (FDS) for dynamic systems with unmodeled dynamics. In the FDS, umnodeled dynamics is first qualified as soft bound, which as well as model parameters are estimated using a robust identification algorithm. Then as a fault detection index, Kullback discrimination information (KDI) is derived into a feasible form and an index of umnodeled dynamics is also introduced. A decision making scheme is thus developed so that fault detection is carried out based on the KDI, the index of umnodeled dynamics and other prior information about the system.

关键词： Fault detection parameter identification stochastic modeling robust estimation uncertainty

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Interface dynamics in a block copolymer melt and the effect of noise

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Physical Review E 1996年第6期53卷 R5588(R)-R5588(R)页

作者： Shigeyuki Komura Jun-ichi Fukuda Glenn C. Paquette Department of Mechanical System Engineering Kyushu Institute of Technology Iizuka 820 Japan Department of Physics Faculty of Science Kyoto University Kyoto 606 Japan Media Dynamics Corp.Ltd. Kyoto 600 Japan

The role of fluctuations in the disorder-lamellar transition in a block copolymer melt is investigated using a cell dynamical system simulation by measuring the propagation velocity of the interface between ordered and disordered regions. Our results strongly suggest that near the transition temperature, in the absence of noise, the velocity increases with quench depth as v∼τ [τ=(Tc−T)Tc is the reduced temperature measured from the transition temperature Tc], while in the presence of noise, the velocity increases as v∼τ. These results lead us to conclude that the addition of noise causes the disorder-lamellar transition to change from second order to first order. This conclusion is consistent with the prediction of Brazovskii [Sov. Phys. JETP 41, 85 (1975)].

关键词： Surface phenomena

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Representation of a Product Assembly Architecture for Assembly Sequence Generation

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Journal of Robotics and Mechatronics 1996年第5期8卷 473-480页

作者： Nagasawa, Isao Adachi, Yasushi Morita, Toru Aramaki, Shigeto Kurono, Shigeru Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka-city Fukuoka820 Japan Kurume Institute of Technology kamizumachi 2223 Kurume-city Fukuoka830 Japan Faculty of Engineering Fukuoka University Nanakuma 8-19-1 Jyonan-ku Fukuoka814-80 Japan Faculty of Engineering Kyushu Sangyo University Matsukadai 2-3-1 Higashi-ku Fukuoka813 Japan

This paper describes the representation of an assembly architecture. A functional element is introduced to represent assembly architecture. By using this functional clement, constraint of assembly architecture can be naturally described. This functional element is used to express relations among the parts. The constraint among assembly parts which interfere without touching can be described by the relation. The relation has an assembly method etc. and can describe constraint and interference. It is shown that the search space of the assembly sequence is reduced by using our representation of assembly architecture. © 1996, Fuji technology Press. All rights reserved.

关键词： Assembly

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NARMAX model of the pCO/sub 2/ control system in man estimated by neural computation

NARMAX model of the pCO/sub 2/ control system in man estimat...

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

作者： M. Noshiro H. Shindou Y. Fukuoka M. Ishikawa H. Minanitani K. Sakamoto A. Tanakadate S. Nebuya School of Allied Health Sciences Kitasato University Sagamihara Japan National Space Development Agency of Japan Japan Institute for Medical and Dental Engineering Tokyo Medical and Dental University Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Japan Faculty of Science and Technology Keio University Japan

Subjects voluntarily inspire a gas mixture in which the CO/sub 2/ concentration is changed stepwise or randomly. The respiratory flow rate and pCO/sub 2/ in the inspired and expired gases are measured to yield the end-tidal pCO/sub 2/ and minute ventilation, which are the input and output of the pCO/sub 2/ control system, respectively. A NARMAX (Nonlinear Auto-Regressive Moving Average with eXogeneous inputs) model of the system is estimated using a three-layered feedforward neural network. The estimated model contains terms, y(t-1), x(t-1), x(t-2), X/sup 2/(t-2) and y(t-1)x(t-2). A measure of nonlinearity calculated from the data used for estimation shows the pCO/sub 2/ control system in most subjects has a nonlinearity which cannot be neglected.

关键词： Control system synthesis Autoregressive processes Ventilation Control systems Space technology Fluid flow measurement Neural networks Feedforward neural networks Nonlinear control systems Dentistry

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Relationship between decentralized and centralized designs in mixed sensitivity problem

Relationship between decentralized and centralized designs i...

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IEEE Conference on Decision and Control

作者： R. Koshiba S. Shin N. Sebe Research anc Developement Center Toshiba Corporation Course of Mathematical Engineering and Information Physics Graduate School of Engineering University of Tokyo Department of Artificial Intelligence Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology

This paper concerns the decentralized design for a MIMO system. The decentralized design means the design of the combination of a pre-compensator and decentralized controllers. An advantage of this idea is that we can regard the decentralized controllers as SISO controllers, if the pre-compensator sufficiently decouples the plant. As a result, it is easy to comprehend the relationship between the controllers and specifications. However, it may occur that the structural restriction of the decentralized controllers results in a poorer performance than a centralized controller. This paper shows that the decentralized design proposed realizes a performance equal to the centralized one in the mixed sensitivity problem based on certain assumptions.

关键词： Centralized control MIMO Physics Artificial intelligence computer science Design engineering systems engineering and theory Large-scale systems H infinity control State feedback

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Development of transient stability controller system (TSC) based on on-line stability calculation

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ELECTRICAL engineering IN JAPAN 1996年第4期117卷 61-79页

作者： Ota, H Inoue, T Ito, H Fukushima, N Omata, K Morita, K Kokai, Y Chubu Electric Power Co. Graduated in 1955 from the Department of Electrical Engineering of the Faculty of Engineering University of Tokyo and joined Chubu Electric Power Co. in the same year. He is engaged mainly in developing technology for construction planning as well as protection stabilization and automatic control of power systems. He is currently a Director and Vice President of the company. He received an OHM Technology Award in 1971 and an Achievement Award from the I.E.E. Japan in 1992. Graduated in 1962 from the Department of Electrical Engineering Shibaura Institute of Technology and joined Chubu Electric Power Co. in the same year. He is engaged in the development of technology for large-scale centralized control of power systems as well as the networking of control computers. He is currently a System Analysis Group Chief in the System Operation Division of the company. Graduated in 1985 from the Department of Electronics and Electrical Engineering of the Faculty of Engineering Tokyo Institute of Technology and joined Chubu Electric Power Co. in the same year. He is engaged mainly in the development of technology for power system protection and stabilization. He is currently working in the System Analysis Group of the System Operation Division of the company. Toshiba Corporation Graduated in 1967 from the Department of Electrical Engineering University of Tokyo and joined Toshiba Corporation in the same year and engaged in development of power system control systems in Japan and abroad. He is currently a Chief of System Technology in the Power System Technology Division of the company. He is a member of the Theses Subcommittee of the 1995 World Energy Conference. He is an Assistant Secretary of the Japanese Committee of CIGRE and a member of the Japanese Subcommittee of CIGRE SC35 and 39. He is a member of IEEE. Completed his Master's course at the Science and Engineering Research Division of the Graduate School Waseda University in 1980 and joined Toshiba Corporation in the same year. H

A new transient stability controller system (TSC) based on on-line transient stability calculation has been developed. The TSC system prevents the power system from wide-area blackout by shedding generators optimally when a serious fault occurs. This system consists of a central processing unit (TSC-P), and four local units for fault detection (TSC-C), and seventeen units for generator shedding(TSC-T). The TSC-P selects optimal generators to be shed for stabilization based on on-line transient stability calculation for contingencies at 500 kV lines and buses every five minutes. The results are transmitted to the TSC-Cs periodically. Should any fault occur, only one TSC-C will detect the fault occurrence and send control signals to the TSC-Ts which actually generate shedding signals. To realize the TSC system, essential are fast stability evaluation methods for a large number of contingencies and effective selection methods of optimal generators to be shed for stabilization. This paper presents total algorithms applied in the TSC-P, the results of algorithm verification tests using a prototype system combined with a large-scale analog simulator, and the characteristics of the actual system.

关键词： power system stabilization generation shedding on-line stability calculation screening parallel calculation

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STRESS INTENSITY FACTORS FOR V-NOTCHED STRIP UNDER TENSION OR INPLANE BENDING

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INTERNATIONAL JOURNAL OF FRACTURE 1995年第1期70卷 81-97页

作者： CHEN, DH Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan

The singular stress field around a sharp notch tip is expressed as a sum of two independent fields: a symmetric field with a stress singularity 1/tau(1-lambda 1) and a skew-symmetric field with a stress singularity 1/tau(1-lambda 2). The intensities of the symmetric and skew-symmetric singular stress fields are defined in terms of constants K-I and K-II, respectively. In this study, a plane problem of a strip with single or double edge notches under tension or in-plane bending is considered. The bisector of the notch may be inclined to the edge, so that the two singular stress fields with different singularities may be created simultaneously at the notch tip. The body force method is used to calculate the stress intensity factors K-I and K-II. In numerical analysis, basic density functions of the body forces are introduced to characterize the stress singularity at the notch tip. The advantages of this technique are the high accuracy of results, due to the smoothness of the unknown weight functions, and the presence of the direct relation between the values of K-I and K-II and the values of unknown weight functions. The stress intensity factors are systematically calculated for the various geometrical conditions.

关键词： Fracture mechanics

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A POINT FORCE AND AN EDGE DISLOCATION IN AN ELLIPTIC INCLUSION EMBEDDED IN AN INFINITE MEDIUM

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INTERNATIONAL JOURNAL OF FRACTURE 1995年第4期71卷 311-322页

作者： CHEN, DH Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan

The plane elasticity problem of an infinite plate containing an elliptical inclusion is considered and the solutions for a point force and/or a dislocation located inside the inclusion are derived. By using the complex potential approach of Muskhelishvili, the general solutions are obtained in a form of a certain function plus an infinite series. The numerical convergence of the solutions is found to be better than that of Warren's solutions for the same problem. The proposed solutions are also appropriate for the case of a point force and dislocation acting at a point just on the interface.

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