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5th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, TELSIKS 2001

作者： Dimirovski, G.M. Jing, Yuanwei Zhang, Siying Dept. of Computer Engineering Faculty of Engineeing DOGUS University Zeamet Sk. 21 TR-81010 Kadikoy-Istanbul Turkey Institute of Automation and Systems Engg. Faculty of Electical Engineering Methodius University MK-1000 Skopje Macedonia Institute of Control Theory School of Information Science and Engineering Northeastern University Shenyang Liaoning 110006 China

ISBN: (纸本)078037228X

This paper addresses networking and traffic control problems in network systems along with the potential for introducing soft-computing applications at supervisory control level. The incentive Stackelberg strategy control concept was introduced to the networking model that comprises subsidiary systems of users and of network. A linear strategy is proposed for the elastic traffic problem, and results are demonstrated and illustrated via Kelly's (1997) example. The presented method is extended to the non-elastic traffic problem and results are also illustrated via a slightly modified Kelly example. Ways of employing combined analytical and soft-computing approaches and techniques in a hybrid framework have been investigated. A fuzzy-Petri-net supervisor is proposed to implement the strategic decision and control layer. Insofar obtained results are rather encouraging, and this research continues further towards possible implementation as well as some open theoretical issues. © 2001 IEEE.

关键词： Game theory

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A Comparison of Optimal Iterative Learning control Schemes

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IFAC Proceedings Volumes 2001年第14期34卷 77-82页

作者： M. Rzewuski E. Rogers D.H. Owens Dept. of Electronics and Computer Science University of Southampton Southampton SO17 IBJ UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Recent years has seen much progress in the theory and application of iterative learning control schemes for both linear and (classes of) nonlinear dynamics. In the case of the former, many algorithms based on minimizing a suitable cost function have been reported. Here the interest is in the so-called norm optimal approach where the basic philosophy is to compute the control input on the current trial such that the tracking error is reduced in an optimal way without too much deviation from the control input used on the previous trial. This paper compares the performance of a range of controllers arising from use of the norm optimal approach - both stand alone and against alternatives.

关键词： iterative learning control optimal algorithms

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A public cryptosystem based on the generated data in extension set

A public cryptosystem based on the generated data in extensi...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Kaiquan Shi Yo-Ping Huang College of Control Science and Engineering Shandong University Jinan Shandong P.R.C Dept. of Computer Science and Engineering Tatung University Taipei Taiwan R.O.C.

ISBN: (纸本)0780370872

Assume X/sup #/ is an extension set in the domain U. Let X/sup A/, X/sup B/ be the positive domain of X/sup #/ in which X/sup A//spl sub/X/sup #/, X/sup B//spl sub/X/sup #/, and X/sup A//spl ne/X/sup B/. X/sup A/={x/sub 1//sup A/, x/sub 2//sup A/, ..., x/sub n//sup A/}, X/sup B/={x/sub 1//sup B/, x/sub 2//sup B/, ..., x/sub n//sup B/}. /spl forall/x/sub 1//sup A/, x/sub 1//sup B//spl isin/N/sup +/, |X/sup A/|/spl ges/4, |X/sup B/|/spl ges/4. By using the accumulated generating operation, we can obtain a mathematical model from X/sup A/ and X/sup B/. From the mathematical model we also derive the sets of X'/sub A/ and X'/sub B/. Both X'/sub A/ and X'/sub B/ are the extended domains of X/sup #/. There exist polynomials p/sup A/(x), p/sup B/(x); and p/sup AB/(x) from X'/sub A/, X'/sub B/, and X/sup AB/, respectively. Based on the p/sup A/(x), p/sup B/(x), and p/sup AB/(x), we propose a new public cryptosystem. In the presented system, we have a public cryptography system from generated data in extension set X/sup #/, a public cryptosystem from two generated data in extension set X/sup #/, and a public cryptosystem from hybrid generated data in extension set X/sup #/. The proposed model is a secure system. Both sides in the communication system can depend on the proposed cryptosystem to fulfill the cryptography of the to-be-transmitted file and de-cryptograph of the cryptograph.

关键词： Cryptography Mathematical model Set theory Hybrid power systems Information systems Information security Educational institutions Polynomials Communication systems Communication system security

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On simulation based analysis and synthesis of hierarchical network sturctures 6

On simulation based analysis and synthesis of hierarchical n...

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6th European control Conference, ECC 2001

作者： Tanevska, Dijana J. Dimirovski, Georgi M. Stankovski, Mile J. Jing, Yuanwei Makedonski Telekomunikacii AD Orce Nikolov Str. b.b. SkopjeMK-91000 Macedonia Inst. of Automation and Systems Engg. Faculty of Electrical Engg. SS Cyril and Methodius University SkopjeMK-1000 Macedonia Department of Computer Engg. Faculty of Engineering DOGUS University Kadikoy-IstanbulTR-81010 Turkey Dept. of Automatic Control and Control Eng. School of Information Science and Engineering Northeastern University Shenyang Liaoning110006 China

ISBN: (纸本)9783952417362

Analysis of complex systems such as hierarchically structured network systems that are employed in modelling and analysis various aspects and issues of control and management in telecommunications is investigated. Theory of graphs and binary matrices appear to be most suitable tools for modelling the overall structure of complex systems, in general, and of systemic hierarchies, in particular. A systematic methodology has been developed for computer simulation analysis and detecting general hierarchies in communications networking as well as for synthesis of system hierarchies. This methodology is an improved extension of Warfield's technique. © 2001 EUCA.

关键词： Discrete event simulation

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Stability of On-line Compensated Real-time Scheduled control Tasks

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IFAC Proceedings Volumes 2001年第22期34卷 319-324页

作者： Pau Martí Ricard Villà Josep M. Fuertes Gerbard Fobler Dept. of Automatic Control Technical University of Catalonia Pau Gargallo 5 08028 Barcelona SPAIN Ph.: 34-3-4011679 Fax: 34-3-4017045 Dept. of Computer Engineering Mälardalen University PO Box 883 SE-721 23 Västerås SWEDEN

Real-time scheduling methods introduce various types of jitter in task instance execution. For real-time computer-controlled systems, the introduced sampling jitter and sampling-actuation delays may degrade the system performance and even lead to instability in the system. The degradation of the system performance can be compensated on-line by updating the controller parameters at each controller task instance execution, in what we call the compensation approach. In this paper we present stability analysis for controller tasks that perform the compensation approach.

关键词： Real-time computer systems Real-time tasks Scheduling algorithms Discrete-time systems Stability analysis

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On the Structure of Singular Discrete Linear Repetitive Processes

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IFAC Proceedings Volumes 2001年第13期34卷 555-559页

作者： K. Galkowski E. Rogers D.H. Owens Institute of Control and Computation Enginrering Technical University of Zielona Gora Poland Dept. of Electronics and Computer Science University of Southampton Southampton S017 1BJ U.K. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD U.K.

Repetitive processes are a distinct class of 2D systems of both theoretical and applications interest. They are characterized by a series of sweeps through a set of dynamics with explicit interaction between the outputs, or pass profiles, produced on successive passes. Their essential unique features are that (i) information propagation is over a finite duration in one of the two separate directions of information propagation; and (ii) the explicit interaction between successive pass profiles can lead to oscillations in the sequence of pass profiles that increase in amplitude in the pass to pass direction. In the case of processes with linear dynamics (either differential or discrete) a reasonably rich systems theory is available for models which are standard (or nonsingular). In this paper, we provide the first substantial results on discrete linear repetitive processes described by a singular state space model.

关键词： Repetitive dynamics discrete dynamics singularity 2D linear systems

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On real-time control tasks schedulability

On real-time control tasks schedulability

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European control Conference (ECC)

作者： P. Marti R. Villa J.M. Fuertes G. Fohle Dep. of Automatic Control Universitat Politècnica de Catalunya Barcelona SPAIN Dept. of Computer Engineering Mälardalen Högskola PO Box 883 SE-721 23 Västerås Sweden

In general, characteristics of classical control theory and properties of real-time scheduling algorithms may cause unexpected control system responses in the implementation of real-time computer-controlled systems. Revising real-time scheduling properties, we analyse which are the main timing problems that current scheduling algorithms may introduce in the execution of control loops. Next, we categorise those timing problems, that is, jitters on task-instances executions, in a control context. Afterwards, we show, by simulations, different types of control system performance degradation that these jitters may cause. Finally, we propose possible solutions that solves this degradation, based on irregular sampling discrete-time system models with varying time delays.

关键词： Jitter Real-time systems control systems Degradation Delays Processor scheduling

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Decentralized Adaptive State Feedback control for Composite Large-Scale Uncertainty Systems *

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IFAC Proceedings Volumes 2001年第3期34卷 49-54页

作者： Xiaoli Zhang Jun Zhao Georgi M. Dimirovski Jovan Stefanovski Inst. of Control Science School of Information Science & Engineering Northeastern University P.O. Box 321 Shenyang Liaoning 110006 P.R. of China Dept. of ASE - Faculty of EE ss Cyril &Methodius University Skopje Rep. of Macedonia Dept. of Computer Eng. DOGUS University Acibadem 81010 Istanbul-Kadikoy Rep. of Turkey FAX#: +90-216-327-9631

The problem of adaptive state feedback exponentially practically stabilizing a class of composite system with uncertainty and disturbance is considered. The uncertainties of the system can be non linear or time-varying. The bounds of the uncertainties exist, but are unknown. A designing scheme of exponentially stable adaptive controller of the system, which can guarantee the state of the system to reach the prescribed equilibrium point's nearby region in limited time, is given. Finally, the simulations performed show the validity of the new result derived.

关键词： Adaptive control Large-scale composite systems Uncertainties Statefeedback Stability

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Design of Dynamic Compensators for Generalised Interconnected Systems with Similar Structure

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IFAC Proceedings Volumes 2001年第3期34卷 61-64页

作者： Haibin Shil Yuanwei Jingl G.M. Dimirovski Siying Zhang M.J. Stankovski Institute of Control Science School of Information Science & Engineering Northeastern University Po.B.321 Shenyang Liaoning 110006 P R. of China Dept. of Computer Engg. Faculty of Engineering DOG US University Acibadem 81010 Istanbul-Kadikoj Rep.of Turkey Inst. of A SE Faculty of EE ss Cyril&Methodius University Skopje R of macedonia

A class of generalized interconnected systems, possessing similar linear structure and non linear unmatched interconnections, is studied in this paper. Hence a new topic of similarity systems research is presented. Dynamic compensators are designed so that the closed-loop systems of the original systems and the compensators are asymptotically stable and have no impulse effect. Compensators also possess similar structures and are realized easily, so that a destroyed compensator is easily reproduced.

关键词： Compensation dynamic output feedback generalized interconnected systems non linear interconnections similar structure

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Optimal Pricing Strategies Based on Time Delay in Multi-Service Networks

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IFAC Proceedings Volumes 2001年第3期34卷 105-110页

作者： Fude Jin Yuanwei Jing Zhianhua Zhou G.M. Dimirovske K. Sohraby Institute of Control Science School of Information Science & Engineering Northeastern University Shenyang Liaoning 110006 P.R. of CHINA +86-24/2389-3138 Inst. of Automation & Systems Engg. Faculty of EE SSs. Cyril & Methodius University Karpos 2 B.B. P.D.Box 574:MK-1000 Skopje Rep.of Macedonia Fax# +90-216/327-9631 Dept. of Computer Science & Telecommunications University of Missouri-Kansas Kansas City M064110 USA

The problem of the pricing equilibrium in multi-service priority-based networks isstudied by using Stackelberg game theory. Some concepts of the game theory were revisited first. Then, the existing results on two-user, twolevel Nash problem was reviewed briefly. Following this background, a new one-leader, two-level, two-user incentive Stackelberg strategy was derived and proved by employing the time delay involved.

关键词： Communication networks game theory incentives optimal systems priority Stackelberg game

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