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1997 American control Conference

作者： Gao, LQ Leng, KP Zhang, SY Department of Automatic Control Northeastern University Shenyang Liaoning China Open Laboratory of Complex System Engineering Institute of Automation Academia Sinica Shenyang Liaoning China

This paper discusses stability for a class of symmetric composite systems. For the asymptotical stability of the overall system without control a necessary and sufficient condition is given, It is shown that Lyapunov ... 详细信息

ISBN: (纸本)0780338332

关键词： large-scale systems asymptotic stability linear systems Lyapunov methods matrix algebra control system analysis large-scale systems symmetrically coupled subsystems asymptotic stability necessary condition sufficient condition Lyapunov function linear systems matrix algebra

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A mathematical approach to describing a class of hybrid systems

A mathematical approach to describing a class of hybrid syst...

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Workshop on Parallel and Distributed Real-Time systems

作者： R. Drath Department of Automatic Control and System Engineering Technical University Ilmenau Germany

Methods for describing continuous respectively discrete event systems have been thoroughly explored, but there is a need for universal methods to describe hybrid systems, in which continuous, as well as discrete subsystems are combined. Mathematical techniques are just emerging and have to be developed further. In this paper a new mathematical approach to modelling a class of hybrid systems is presented. A numerical example illustrates the principle.

关键词： Switches Discrete event systems Power system modeling Continuous time systems Petri nets Mathematical model Differential equations Sampled data systems Discrete time systems Boolean functions

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IEEE International Symposium on Intelligent control (ISIC)

作者： I. Eminoglu D.A. Linkens Department of Automatic Control and System Engineering University of Sheffield Sheffield UK

This paper investigates the effects of reducing the number of rules in a fuzzy logic controller (FLC) for a permanent magnet direct current (PMDC) motor. The reliability of the resulting controller, with fewer rules, is also investigated. First, rule extraction is shown front typical transient responses of a PMDC motor when the reference speed changes in a step-like manner. Next, the total number of rules is reduced from 49 rules to 9 rules by eliminating similar fuzzy rules; their corresponding membership functions are then replaced by other already available membership functions. Finally, the FLC consisting of 9 rules has been chosen in this study to investigate the sensitivity of the controller. The values in the decision table are changed in the range of /spl plusmn/30%. It is found that these variations in the rule decision table do not cause any instability problem in the proposed FLC.

关键词： Fuzzy logic control systems Motor drives DC motors Fuzzy systems Fuzzy control Choppers automatic control Permanent magnet motors Voltage

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Hydraulically coupled power-plants commitment within short-term operation planning in mixed hydro-thermal power systems

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第5期7卷 323-330页

作者： Rakic, MV Markovic, ZM [?]Dr. Milan V. Rakic (1938) received his electrical engineering degree in 1962 his M.S. degree in 1972 and his Ph.D. degree in 1993 from the University of Belgrade Yugoslavia. He made additional studies in operations research and system science at Stanford University Department of Operations Research Stanford/California USA and Western Reserve University System Research Center. Cleveland/Ohio USA in 1969/1970. He joined the Mihajlo Pupin Institute Department of Automatic Control Belgrade/Yugoslavia in 1962. He was engaged in large-scale system control studies and research. Since 1975 he has been working on the development of methods and software for power system operation planning. He is currently a senior research associate at the Mihajlo Pupin Institute. (Mihajlo Pupin Institute Volgina 15 POBox 15 11050 Belgrade Yugoslavia Phone: +381-11-773-503 Fax: +381-11-773-835)

A new method for short-term operation planning and power exchange scheduling of interconnected hydrothermal power systems is proposed in the paper. The criterion function is the total variable profit obtained sales of energy to customers within the system, exchange of energy with other systems, diminished by the cost of system operation. The method is based on Lagrangian relaxation, decomposition technique and successive solution of dual and primal problems. The dual and primal problems are decomposed and solved using appropriate optimization methods, while Lagrangian multipliers are corrected using subgradient method. Dual hydro subproblems are solved using linearization and network flow method. Special modification of the algorithm is made so as to enable commitment of hydro power plants, taking into account bilogical constraints on minimal flow of water downstream of the hydro power plant. The efficiency of the method is illustrated on a test problem.

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An error analysis of GPS compass

An error analysis of GPS compass

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SICE Annual Conference

作者： Chansik Park Ilsun Kim Gyu-In Jee Jang Gyu Lee Application System Development Team Network Division Samsung Electronics Seoul South Korea Multimedia Laboratory. Corporate Technical Operations Samsung Electronics Company Limited Suwon South Korea Department of Electronics Engineering Konkuk University Seoul South Korea Automatic Control Research Center School of Electrical Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0780342089

In this paper, analytical error characteristics of GPS compass which determines heading and elevation of the vehicle using carrier phase measurements from two antennas is given. The derived result gives clear analysis of error statistics on attitude determination using GPS carrier phase measurement. It shows the accuracy of measured attitude relies on satellite geometry, performance of receiver, baseline length, baseline configuration and nominal attitude of vehicle. It is also shown that to obtain more precise heading, longer baseline along the vehicle is preferred and the accuracy of heading is always better than that of elevation since the vertical measurement uncertainty caused by geometry of satellites affects only on that of elevation. These results can be applied to basic directions for attitude determination: to what direction should the baseline be located to minimize the error, which satellites should be selected to minimize the error. These must be important and useful pre-information in attitude determination problem. An application to real data shows that the predicted error by the proposed method coincides with that of experiments.

关键词： Error analysis Global Positioning system Vehicles Position measurement Satellites Phase measurement Geometry Antenna measurements Length measurement Measurement uncertainty

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Artificial Intelligence Embedded Object-Oriented Methodology For Model Based Decision Support

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Journal of systems engineering and Electronics 1996年第1期7卷 1-14页

作者： Feng Shan Tian Yuan Li Tong & Cai Jun (Institute of system engineering, department of automatic control engineering Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China) Institute of System Engineering Department of Automatic Control Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China

The paper presents the coupling of artificial intelligence-AI and Object-oriented methodology applied for the construction of the model-based decision support system *** MBDSS is designed for support the strategic decision making lead to the achievemellt of optimal path towardsmarket economy from the central planning situation in China. To meet user's various requirements,a series of innovations in software development have been carried out, such as system formalization with OBFRAMEs in an object-oriented paradigm for problem solving automation and techniques of modules intelligent cooperation, hybrid system of reasoning, connectionist framework utilization,etc. Integration technology has been highly emphasized and discussed in this article and an outlook to future software engineering is given in the conclusion section.

关键词： Artificial intelligence Object-oriented methodology Knowledge-based systems Intelligently cooperative systems Neural nets Case hased reasoning Behavioral science,Advancedautomation.

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Liveness conditions for a safe distributed deadlock resolution algorithm 4

Liveness conditions for a safe distributed deadlock resoluti...

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4th Euromicro Workshop on Parallel and Distributed Processing, PDP 1996

作者： Gonzalez De Mendhil, J.R. Farina, F. Villadangos, J. Garitagoitia, J.R. Department of Automatic Control Electronics and System Engineering Public University of Navarra Campus Arrosadia s/n Pamplona3 1006 Spain Department of Mathematics and Computation Public University of Navarra Campus Arrosadia S/n Pamplona3 1006 Spain

ISBN: (纸本)0818673761

Although the problem of deadlock detection and resolution in distributed systems has been studied in detail during the last years, it is still an open and difficult problem for all but the simplest models. One of the main difficulties in finding adequate solutions in the Multiple-Request model resides in the need to avoid false deadlock resolutions. In this paper we show a distributed solution with the Strong Safety Condition of only true deadlocks must be detected/resolved. The algorithm was proved to satisfy this safety condition and now we study the liveness conditions the algorithm supports. © 1996 IEEE.

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Towards a research on information pollution

Towards a research on information pollution

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IEEE International Conference on systems, Man and Cybernetics

作者： Kai-Yuan Cai Chao-Yang Zhang Department of Automatic Control Beijing Aeronautics and Astronautics University Beijing China China Institute of Aeronautics System Engineering Beijing China

ISBN: (纸本)0780332806

Information revolution may incur information pollution, noting that industrial revolution incurred environmental pollution. By information pollution we mean the presence and spread of undesirable messages in the human society, in quantities large enough to produce significantly adverse effects on human activities and social life. Information theory is mainly concerned with probabilistic uncertainty of messages, whereas information pollution research pays attention to values of messages: a message can be essential, useful, useless, harmful, or even poisonous. In this paper we discuss the information pollution phenomenon, and present statistics of information pollution (e-mail collected on Internet). We propose a quantitative index to measure information pollution and highlight various potential approaches to modeling the information pollution behavior.

关键词： Environmentally friendly manufacturing techniques Industrial pollution Internet Information technology Humans Electronic mail Intelligent networks Intelligent robots History Chaotic communication

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Liveness conditions for a safe distributed deadlock resolution algorithm

Liveness conditions for a safe distributed deadlock resoluti...

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Euromicro Workshop on Parallel and Distributed Processing

作者： J.R. Gonzalez de Mendivil F. Farina J. Villadangos J.R. Garitagoitia Department of Automatic Control Electronics and System Engineering Public University of Navarra Pamplona Spain Department of Mathematics and Computation Public University of Navarra Pamplona Spain

Although the problem of deadlock detection and resolution in distributed systems has been studied in detail during the last years, it is still an open and difficult problem for all but the simplest models. One of the main difficulties in finding adequate solutions in the Multiple-Request model resides in the need to avoid false deadlock resolutions. In this paper we show a distributed solution with the Strong Safety Condition of "only true deadlocks must be detected/resolved". The algorithm was proved to satisfy this safety condition and now we study the liveness conditions the algorithm supports.

关键词： system recovery Resource management Safety Probes systems engineering and theory Mathematics Distributed computing Mathematical model Scholarships Algorithm design and analysis

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Artificial Intelligence Embedded Object-Oriented Methodology for Model Based Decision Support

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IFAC Proceedings Volumes 1995年第7期28卷 371-379页

作者： Feng Shan Tian Yuan Li Tong Cai Jun Institute of System Engineering Department of Automatic Control Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China

The paper presents the coupling of artificial intelligence - AI and Object-oriented methodology applied for the construction of the model-based decision support system MBDSS. The MBDSS is designed for support the strategic decision making lead to the achievement of optimal path towards market economy from the central planning situation in China. To meet user’s various requirements, a series of innovations in software development have been carried out, such as system formalization with OBFRAMEs in an object-oriented paradigm for problem solving automation and techniques of modules intelligent cooperation, hybrid system of reasoning, connectionist framework utilization, etc. Integration technology has been highly emphasized and discussed in this article and an outlook to future software engineering is given in the conclusion section.

关键词： Artificial intelligence AI Object-oriented methodology OOM Knowledge-based systems KBS Intelligently cooperative systems Neural nets NNs Case Based Reasoning CBR Behavioral Science Advanced Automation

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