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29th Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBS 2007), vol.14

作者： Jacek Kawa Ewa Pietka Faculty of Automatic Control Electronics and Computer Science Department of Biomedical Engineering Gliwic Silesian University of Technology Gliwice Poland

Fuzzy c-means method (FCM) is a popular tool for a fuzzy data processing. In the current study, a FCM-based method of fuzzy clustering in a kernel space has been implemented. First, a "kernel trick" is applied to the fuzzy c-means algorithm. Then, the new method is employed for a fast automated segmentation of demyelination plaques in Multiple Sclerosis (MS). The clusters in a Gaussian kernel space are analysed in the histogram context and used during the initial classification of the brain tissue. Received classification masks are then used to detect the region of interest, eliminate false positives and label MS lesions.

关键词： Multiple sclerosis Kernel Clustering algorithms Image segmentation Prototypes Partitioning algorithms Lesions Magnetic resonance imaging Fuzzy sets Data processing

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MULTI-ROBOT SYSTEMS: FROM FINITE AUTOMATA TO MULTI-AGENT SYSTEMS

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IFAC Proceedings Volumes 2007年第18期40卷 121-126页

作者： Doru Panescu ştefan Dumbrava “Gh. Asachi” Technical University of Iaşi Faculty of Automatic Control and Computer Engineering Department of Automatic Control and Applied Informatics Bd. D. Mangeron 53 A Iaşi Romania dorup@ac.tuiasi.ro sdumbrav@ac.tuiasi.ro

An attempt to connect finite automata theory with multi-agent systems is presented. The purpose is to obtain an accurate way to plan and control the robot activities within a multi-robot system. The proposed model is an adapted Moore machine, which is to be used with a contract net protocol agent coordination procedure. The considered architecture was tested in an educational flexible manufacturing system with two industrial robots.

关键词： Robotics multi-robot systems multi-agent systems robot programming finite automata flexible manufacturing systems

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DFT algorithm analysis in low-cost power quality measurement systems based on a DSP processor

DFT algorithm analysis in low-cost power quality measurement...

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International Conference on Electrical Power Quality and Utilisation (EPQU)

作者： Miroslaw Szmajda Krzysztof Gorecki Janusz Mroczka Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland Faculty of Electronics Chair of Electronics and Photonics Metrology Technical University of Wrocław Wroclaw Poland

The application of power quality parameters measurement algorithms requires utilization of computational methods which transform the signal from the time- to the frequency-domain. Currently, the most frequently applied method is the fast Fourier transformation (FFT). Because of the amendment of the proper power quality standards, it is also necessary to consider of implementation discrete Fourier transformation (DFT) algorithms. Considering the number of computations, DFT is more complicated than FFT. This paper presents basic analog-to-digital conversion parameters, which are defined in the norms, the time duration analysis of DFT algorithms, considering described assumptions and comparing them to FFT. Codes created in C and assembler languages, as well as the Matlab/Simulink environment, were taken into account. The software including the aforementioned codes was implemented in a low-cost power quality measurement system based on the TMS320c6713 floating point DSP processor from Texas Instruments. In the software, a real time DSP/BIOS operation system was used. Multi thread programming in power quality measurement systems was presented, and an analysis of computational efficiencies of the systems based on the TMS320c6 713 DSP processors was performed.

关键词： Algorithm design and analysis Power quality Power measurement Digital signal processing Discrete Fourier transforms Frequency measurement Discrete transforms Frequency domain analysis Analog-digital conversion Assembly

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MARKOV DECISION PROCESSES WITH UNCERTAIN TRANSITION RATES: SENSITIVITY AND MAX HYPHEN MIN control

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Asian Journal of control 2008年第2期6卷

作者： Suresh Kalyanasundaram Edwin K. P. Chong Ness B. Shroff Motorola India Electronics Limited No. 66/1 Plot 5 Bagmane Techpark C. V. Raman Nagar Post Bangalore 560 093 India. Department of Electrical and Computer Engineering Colorado State University Fort Collins CO 80523-1373 USA. Professor Edwin K. P. Chong received the B.E.(Hons.) degree with First Class Honors from the University of Adelaide South Australia in 1987 graduating top of his class and the M.A. and Ph.D. degrees in 1989 and 1991 respectively both from Princeton University where he held an IBM Fellowship. He joined the School of Electrical and Computer Engineering at Purdue University in 1991 where he was named a University Faculty Scholar in 1999 and promoted to Full Professor in 2001. Since August 2001 he has been a Professor of Electrical and Computer Engineering and Professor of Mathematics at Colorado State University. His current interests are in communication networks and optimization methods. He coauthored the best-selling book An Introduction to Optimization 2nd Edition Wiley-Interscience 2001. He received the NSF CAREER Award in 1995 and the ASEE Frederick Emmons Terman Award in 1998. He coauthored a paper that was awarded Best Paper in the journal Computer Networks 2003. Professor Chong is a Fellow of the IEEE. He was founding chairman of the IEEE Control Systems Society Technical Committee on Discrete Event Systems and until recently served as an IEEE Control Systems Society Distinguished Lecturer. He has been on the editorial board of the IEEE Transactions on Automatic Control. He is currently on the editorial board of the journal Computer Networks. He has also served on the organizing committees of several international conferences. He has been on the program committees for the IEEE Conference on Decision and Control the American Control Conference the IEEE International Symposium on Intelligent Control IEEE Symposium on Computers and Communications and the IEEE Global Telecommunications Conference. He has also served in the executive committees for the IEEE Co

Solution techniques for Markov decision problems rely on exact knowledge of the transition rates, which may be difficult or impossible to obtain. In this paper, we consider Markov decision problems with uncertain transition rates represented as compact sets. We first consider the problem of sensitivity analysis where the aim is to quantify the range of uncertainty of the average per-unit-time reward given the range of uncertainty of the transition rates. We then develop solution techniques for the problem of obtaining the max-min optimal policy, which maximizes the worst-case average per-unit-time reward. In each of these problems, we distinguish between systems that can have their transition rates chosen independently and those where the transition rates depend on each other. Our solution techniques are applicable to Markov decision processes with fixed but unknown transition rates and to those with time-varying transition rates.

关键词： Markov decision processes sensitivity max-min control call admission control policy iteration

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DC Link Voltage control of an Induction Generator/PWM Converter System

DC Link Voltage Control of an Induction Generator/PWM Conver...

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2007 International Aegean Conference on Electrical Machines and Power Electronics, vol.2

作者： M. Albu V. Horga M. Ratoi C. Botan Electrical Engineering Faculty Gheorghe AsachiE2809C Technical University Iasi Romania Automatic Control and Computer Science Faculty Gheorghe AsachiE2809C Technical University Iasi Romania

The paper presents the results referring to the dc link voltage control of an induction generator/PWM converter system. This system can be used for the renewable energy sources in isolated areas. The voltage control i... 详细信息

关键词： Voltage control Induction generators Pulse width modulation converters control systems Power systems Wind turbines Analog-digital conversion Static power converters Capacitors Rectifiers

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Preface

Advanced Textbooks in Control and Signal Processing

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Advanced Textbooks in control and Signal Processing 2007年第9781846288722期 ix-xii页

作者： Hrúz, Branislav Zhou, Mengchu Department of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava 1812 19 Slovakia Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

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Manufacturing control Laboratory with an embedded ERP application for educational purposes

Manufacturing Control Laboratory with an embedded ERP applic...

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2006 IEEE International Conference on Computational Cybernetics, ICCC

作者： Dumbrava, Stefan Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University Bd. Mangeron no.53A 700050 Iasi Romania

ISBN: (纸本)1424400716

Enterprise control applications are becoming more and more complex, exploiting distributed object technology in multi-tier architectures. For educational purposes, the development of a manufacturing control laboratory that may emphasize the new control techniques and the overall integration of the system activities is a complex and challenging task. In the paper, an enterprise application solution that integrates the ERP concept in three-tier architecture with a Flexible Manufacturing System is presented. It contains modularized, distributed subsystems in configurable and maintainable software. Starting from the customer order, to planned order dispatch, the ERP main components and the information flow within the system is presented. The software architecture contains the ERP components that are implemented using Enterprise Java Beans, deployed in a J2EE application server. It enables transactions with the business environment, shop-floor system and the database. The application is conceptually designed and analyzed using a visual model developed in Unified Modeling Language.

关键词： Visual languages

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Pulse method measurements for determination of line fault location

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Archives of Electrical engineering 2006年第217-218期55卷 301-312页

作者： Tarczyński, WiesLaw Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change of wave impedance causing a change in reflection coefficient for pulses moving along the line. An exemplary analysis is performed for a homogenous lossless line at its starting and terminal points. The results of analysis are analytical expressions describing quantitative interactions of pulses. The expressions are verified both by computer simulation and by measurements of the real line. There has been performed the analysis of influence of the resistances with which the terminal points of the line are loaded onto the amplitude value of the pulses registered at the starting point of the line. The new method and the new system of measurements of pulses have been proposed that minimize the interaction of pulses at the starting point of the line, disadvantageous for the process of fault location by using pulse method.

关键词： Electric fault currents

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Determination of regulation characteristics of switched reluctance motors for quasi-optimal operation

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Archives of Electrical engineering 2006年第217-218期55卷 313-324页

作者： Tomczewski, Krzysztof Wach, Piotr Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, because the regulation characteristics depend on three variables: phase voltage, switch-on and switch-off angles. For this reason in a steady state the same operation point (Tl, ω) of the mechanical characteristic is attainable for quite different values of those control parameters. So there is a field for quasi-optimal operation and the choice of the coresponding control parameters is the main subject of this work. The paper presents also the method to determine these quasi-optimal control characteristics from simple tests or from computations based on presented simple mathematical model.

关键词： Reluctance motors

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Variable SYNC Signal Definition for Automata Performance Improvment

Variable SYNC Signal Definition for Automata Performance Imp...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Nicolae Galupa Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Romania

The present paper considers the problem of digital hazards that are present in combinatorial logic structures. My work is focused not on eliminating these hazards but on how to avoid and eventually use this unwanted feature when we are designing a digital automaton. The idea is to theoretically trace the output of the circuit implementing the next state functions of the automaton, determine the time frames when these outputs are logically correct and use those specific moments of time to provoke the automaton's evolution towards the next correct state (according to the automaton's states transitions graph). By doing so we shall drastically improve the working speed of the automaton we design

关键词： Automata Hazards Synchronization Clocks Circuits Timing automatic control control engineering computing automatic logic units Signal design

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