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

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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A GENERAL UPDATING RULE FOR DISCRETE HOPFIELD-TYPE NEURAL NETWORK WITH TIME-DELAY AND THE CORRESPONDING SEARCH ALGORITHM

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International Journal of Computational Intelligence and Applications 2001年第4期1卷 399-412页

作者： DANIEL S. YEUNG SHENSHAN QIU ERIC C. C. TSANG XIZHAO WANG Dept. of Computing The Hong Kong Polytechnic University HungHom Hong Kong China Department of Automatic Control Engineering South China University of Technology Guangzhou 510640 China Hubei University Hubei China

In this paper, the Hopfield neural network with delay (HNND) is studied from the standpoint of regarding it as an optimizing computational model. Two general updating rules for networks with delay (GURD) are given based on Hopfield-type neural networks with delay for optimization problems and characterized by dynamic thresholds. It is proved that in any sequence of updating rule modes, the GURD monotonously converges to a stable state of the network. The diagonal elements of the connection matrix are shown to have an important influence on the convergence process, and they represent the relationship of the local maximum value of the energy function to the stable states of the networks. All the ordinary discrete Hopfield neural network (DHNN) algorithms are instances of the GURD. It can be shown that the convergence conditions of the GURD may be relaxed in the context of applications, for instance, the condition of nonnegative diagonal elements of the connection matrix can be removed from the original convergence theorem. A new updating rule mode and restrictive conditions can guarantee the network to achieve a local maximum of the energy function with a step-by-step algorithm. The convergence rate improves evidently when compared with other methods. For a delay item considered as a noise disturbance item, the step-by-step algorithm demonstrates its efficiency and a high convergence rate. Experimental results support our proposed algorithm.

关键词： Discrete Hopfield neural network convergence conditions stable state convergence theorem

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Automated Open-Canal Water-Supply Systems

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IFAC Proceedings Volumes 2001年第3期34卷 189-194页

作者： Jovan D. Stefanovski Georgi M. Dimirovski HS Strezhevo Control & Informatics Div. 7000 Bitola R. Macedonia Dept. of Computer Engineering Faculty of Engineering Dogus University TR-81010 Kadikoy - Istanbul Turkey

This paper presents a feasible open-canal water-distribution control system based on the dynamic regulation principle and the theory of Kalman optimal controller. The existing nonlinear phenomena, as well as the transport delay phenomenon are accounted for. The obtained controller is simulated using the full Saint-Venant partial differential equations

关键词： computer simulation Kalman controller open-canal systems Saint-Venant equations

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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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Hybrid leader-follower and fuzzy-Petri-net traffic rate control and supervision in network systems

Hybrid leader-follower and fuzzy-Petri-net traffic rate cont...

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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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Agent-Oriented Captology for Anthropocentric Systems

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IFAC Proceedings Volumes 2001年第8期34卷 217-222页

作者： Boldur E. Barbat "Lucian Blaga" University of Sibiu Faculty of Engineering Dept. of Comp. Sc. and Automatic Control 4 Emil Cioran Street 2400 Sibiu ROMANIA Phone: +40-69-212523 Fax: +40-69-212716

Considering that anthropo centric systems are an adequate domain for captological approaches, and that interface agents are most natural interactants for the humans involved, the paper presents a broad-spectrum generic architectural framework to support developing flexible interfaces for industrial applications, based on synergetic correlation between persuasive technologies and polymorphic agents. The design space for agent-oriented captology is defined and several of its main dimensions are elaborated upon. The main mechanisms used are dynamic priorities, "flexible cloning" and fuzzy temporal windows. Some agent-oriented test-bench applications instantiating the generic architecture, arc described briefly.

关键词： Human-centred design Man/machine interaction Agents Architectures User interfaces Medical Applications

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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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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

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

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European control Conference (ECC)

作者： Dijana J. Tanevska Georgi M. Dimirovski Mile J. Stankovski Yuanwei Jing Makedonski Telekomunikacii AD Skopje Republic of Macedonia Faculty of Electrical Engg SS Cyril and Methodius University Skopje Republic of Macedonia Department of Computer Engg DOGUS University Kadikoy Istanbul Turkey Dept. of Automatic Control & Control Eng Northeastern University Shenyang Liaoning P.R. of China

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.

关键词： Matrix decomposition Finite element analysis Graphics Software computers Computational modeling

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A Memory NN Computing Structure for Identification of Non-Linear Process Dynamics

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IFAC Proceedings Volumes 2001年第3期34卷 39-44页

作者： Cvetko J. Andreeski Georgi M. Dimirovski Faculty of Tourism & Hospitality Ohrid St. Klement Ohridski University Bitola MK-6000 Ohrid Republic of Macedonia FAX#: ++ 389-96262247 ASE Department Faculty of EE SSs Cyril& Methodius University Skopje Rep. of Macedonia Dept. of Automatic Control & Cont. Syst. Technology johannes Kepler University Linz Austria Dept. of Computer Eng. DOGUS University Acibadem TR-81010 Kadikoy-Istanbul Turkey

Identification of certain system needs search for class of functions or model forapproximation of the system input-output behavior in the "best" possible way. In most situations, as in dynamic systems identification, pattern recognition etc., the value of the output of the mode ling system is function of the previous values of outputs and inputs. In the current circumstances almost all efforts for using neural networks for identification and control are based on feed-forward networks. If the system order or the upper limit of the order is known, all the necessary previous values of the inputs and outputs of the mode led system can be put as input in the network. The network can learn non-memory transformations that include thesystem output dependence on specified previous inputs and outputs.

关键词： Identification non-linear dynamical processes memory neural networks NNcomputing structure process control

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