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Fuzzy Cognitive Maps Modelling Supervisory Large Scale Control Systems

IFAC Proceedings Volumes 1998年第20期31卷 93-98页

作者： Chrysostomos D. Stylios Peter P. Groumpos Voula C. Georgopoulos Laboratory for Automation and Robotics Department of Electrical and Computer Engineering University of Patras Rion 26500 GREECE School of Electrical Engineering and Computer Science Ohio University Athens OH 45701 USA

This paper investigates the implementation of a hybrid methodology, which combines fuzzy logic and neural networks, Fuzzy Cognitive Map (FCM), for the modeling of the supervisor of Large Scale Systems. The description and the construction of Fuzzy Cognitive Map will be extensively examined and it will be proposed a model for the supervisor. There is an oncoming need for more autonomous and intelligent systems, especially in Large Scale Systems and the application of Fuzzy Cognitive Map for the modeling of the Supervisor may contribute in the development of more autonomous systems.

关键词： Modeling Supervisory Control Cognitive Systems

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Stability and convergence of stochastic approximation using the ODE method

Stability and convergence of stochastic approximation using ...

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IEEE Conference on Decision and Control

作者： V.S. Borkar S.P. Meyn Department of Computer Science and Automation Indian Institute of Science Bangalore India Department of Electrical and Computer Engineering and the Coordinated Sciences Laboratory Urbana IL USA

It is shown that the stability of the stochastic approximation algorithm is implied by the asymptotic stability of the origin for an associated ODE. This in turn implies convergence of the algorithm. Several specific classes of algorithms are considered as applications. It is found that the results provide: 1) a simpler derivation of known results for reinforcement learning algorithms; 2) a proof for the first time that a class of asynchronous stochastic approximation algorithms are convergent without using any a priori assumption of stability; and 3) a proof for the first time that asynchronous adaptive critic and Q-learning algorithms are convergent for the average cost optimal control problem.

关键词： Convergence Stochastic processes Approximation algorithms Asymptotic stability Cost function Optimal control Application software Learning computer science automation

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Simultaneous Fault Detection Of Heat Exchangers

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IFAC Proceedings Volumes 1998年第10期31卷 365-370页

作者： Gcibor Szederkényi Erik Weyer Katalin M. Hangos Dept. of Computer Science University of Veszprem H-8201 Veszprem Egyetem u. 3. Hungary Dept. of Electrical and Electronic Engineering The University of Melbourne Parkville VIC 3052 Australia Systems and Control Research Laboratory Computer and Automation Institute HAS H-1518 Budapest PO Box 63 Hungary

A grey box model-based method for fault diagnosis is proposed in this paper. The method is based on a first principle model of the process unit: a heat exchanger, and on a grey box model of the faults: the deterioration of the heat transfer surface by aging and the leaking of the outer container. The deterioration of the heat transfer surface is due to material settling, and in old heat exchangers pieces of this material can break off and cause damage in the equipment. A recursive least squares estimator with forgetting factor is used to track both the heat transfer coefficients and the cold side volume. The heat transfer coefficients are estimated both from the hot and cold side equations. The settled material breakage fault is detected via detection of abrupt positive jumps in the estimated heat transfer coefficients using a detector based on a cumulative sum (CUSUM) test. The proposed method enables simultaneous detection of the two fault types considered. Fault localization along the equipment length is also possible when temperature measurements are available along the length.

关键词： Fault detection Fault isolation Fault location Process model Grey box modelling Identification

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Compensation of teleoperator modeling uncertainties with a sliding mode controller

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ROBOTICS AND computer-INTEGRATED MANUFACTURING 1997年第1期13卷 9-20页

作者： Tzafestas, SG Prokopiou, PA Intelligent Robotics and Automation Laboratory Computer Science Division Department of Electrical and Computer Engineering National Technical University of Athens Zografou Campus 15773 Athens Greece

The response of a previously proposed teleoperator system, which was not based on the traditional notion of telepresence but on an original form of kinesthetic feedback, is tested under modeling errors of up to 50%. The original system is enhanced by replacing the previous controller of each robot with a sliding mode robust one. A two-stage approach is employed: a desired trajectory is first generated and then tracked by the controller. The difficulties incurred for the man/machine cooperation are discussed. This extension of the original teleoperator architecture is tested through simulations and compared with a twin system based on neural controllers, presented elsewhere. (C) 1997 Elsevier science Ltd.

关键词： Man machine systems

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Partial reconfiguration of FPGA mapped designs with applications to fault tolerance and yield enhancement 7th

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7th International Workshop on Field Programmable Logic and Applications, FPL 1997

作者： Emmert, John M. Bhatia, Dinesh Design Automation Laboratory Department of Electrical and Computer Engineering and Computer Science University of Cincinnati P.O. Box 210030 CincinnatiOH45221-0030 United States

ISBN: (纸本)3540634657

Field-programmable gate arrays have the potential to provide reconfigurability in the presence of faults. In this paper, we have investigated the problem of partially reconfiguring FPGA mapped designs. We present a maximum matching based algorithm to reconfigure the placement on an FPGA with little or no impact on circuit performance. Experimental results indicate the algorithm works well for both fault tolerance and reconfigurable computing applications. We also present the motivation and feasibility of using a similar approach for dynamic circuit reconfigurability. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Field programmable gate arrays (FPGA)

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K-way partitioning under timing, pin, and area constraints

K-way partitioning under timing, pin, and area constraints

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IEEE International Conference on Innovative Systems in Silicon

作者： G. Tumbush D. Bhatia Design Automation Laboratory Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

Circuit partitioning is a very extensively studied problem. Our proposed methodology easily extends to multiple constraints that are very dominant in the design of large scale VLSI systems. In this paper we formulate the problem as a nonlinear program (NLP). The NLP is solved for the objective of minimum cutset size under the constraints of pins, area, and timing. We have tested the unified framework for area, timing, and pin constraints. The NLP is solved using the commercial LP/NLP solver MINOS. We have done extensive testing using large scale RT level benchmarks and have shown that our methods can be used for exploring the design space for obtaining constraint satisfying system designs. We also provide extensions for solving system design problems where a choice between multiple technologies, packaging components, performance, cost, yield, and more can be the constraints for design related decisions.

关键词： Timing Large-scale systems Space exploration Space technology Circuits Very large scale integration Pins System testing Benchmark testing Packaging

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Introducing the theory of fuzzy cognitive maps in distributed systems

Introducing the theory of fuzzy cognitive maps in distribute...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： C.D. Stylios V.C. Georgopoulos P.P. Groumpos Laboratory for Automation and Robotics Department of Electrical and Computer Engineering University of Patras Rio Greece School of Electrical Engineering and Computer Science Ohio University Athens OH USA

This paper investigates a novel hybrid fuzzy neural system, fuzzy cognitive map (FCM), and its implementation in distributed systems and control problems. The description and the methodology of this system will be examined and then it will be shown the application of FCM in a process control problem, which will reveal the characteristics and qualities of FCM. There is an oncoming need for more autonomous and intelligent systems, which could be satisfied with the application of FCM in the field of systems and control.

关键词： Fuzzy cognitive maps Fuzzy systems Fuzzy logic Intelligent systems Robotics and automation Fuzzy control Control systems Control system synthesis Neural networks Humans

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Building interactive animations using VRML and Java

Building interactive animations using VRML and Java

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Brazilian Symposium on computer Graphics and Image Processing (SIBGRAPI)

作者： F.S. Tamiosso A.B. Raposo L.P. Magalhaes I.L.M. Ricarte Department of Computer Engineering and Industrial Automation State University of Campinas Sao Paulo Brazil Department-Computer Graphics Laboratory Computer Science University of Waterloo Waterloo ONT Canada

The paper exploits the combination of VRML (Virtual Reality Modeling Language) and Java for the construction of highly interactive animations, whose behaviour is defined in real time by a user's actions. The animations are modeled in VRML, which allows the definition of a Java program to process and generate events that determine the behaviour of scene elements. An application for the generation of Java graphical interfaces was developed, aiming to establish the communication between the user and the VRML environment, sending parameters to the program that controls the animation.

关键词： Animation Java Object oriented modeling Layout computer industry automation computer science computer graphics Virtual reality Power generation

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Working with remote VRML scenes through low-bandwidth connections

Working with remote VRML scenes through low-bandwidth connec...

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Brazilian Symposium on computer Graphics and Image Processing (SIBGRAPI)

作者： A.B. Raposo L.P. Magalhaes I.L.M. Ricarte School of Electrical and Computer Engineering FEEC Department of Computer Engineering and Industrial Automation State University of Campinas Sao Paulo Brazil Computer Science Department Computer Graphics Laboratory University of Waterloo Waterloo ONT Canada

We have developed a Web based application to accelerate the visualization of VRML scenes located in a remote server. This application enables the user to extract only the parts of a scene that are of actual interest. The extracted parts represent one or more sub trees of the hierarchical structure of the VRML scene, and only these parts will be rendered and visualized in the local computer. By reducing the complexity (size) of the remote scene, less data are transmitted from the remote server and the rendering process becomes faster in the local computer. The application is written in Java and is executed as an applet embedded in an HTML page.

关键词： Layout Java World Wide Web Application software Tactile sensors Acceleration Data visualization HTML Graphics Animation

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A Polynomial Function Discovery System — FFS

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International Journal on Artificial Intelligence Tools 1997年第1期6卷 1-13页

作者： Spyros Tzafestas Zhifang Ma Intelligent Robotics and Automation Laboratory Department of Electrical and Computer Engineering National Technical University of Athens Zografou 15773 Athens Greece On leave from the Department of Computer Science Jilin University Changchun P.R.China

This paper presents a function discovery system FFS that has two core parts: FFS-0-CORE and FFS-1-CORE. Both cores are with polynomial time complexity in discovering functions of either a•f(x)+b form or a 1 f 1 (x)+…+a n f n (x)+b form. FFS-0-CORE allows users to define their own models. FFS-1-CORE uses novel principles to increase information which helps the function discovery procedures. Three computational examples are included.

关键词： Formula discovery machine discovery machine learning artificial intelligence

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