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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： I.N.M. Papadakis J.G. Reisman S.C.A. Thomopoulos Dept. of Electr. & Comput. Eng. Pennsylvania State Univ. University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

An effective method for visual pattern recognition using morphological techniques is presented. It is shown that it can be successfully used for the recognition of deformed letters. The method extracts morphological information by the successive dilation of an idealized letter set. At each stage a properly defined similarity index is computed. The maximum values of the similarity index for each stored letter are compared and are used for the classification decision. Classification results are presented for a set of deformed capital English letters with a realistic level of deformation. Skeletonization of the deformed pattern is shown to improve the performance of the classification method. The described method can be easily implemented using a parallel architecture.< >

关键词： Pattern recognition Artificial neural networks Feature extraction Clocks control systems Laboratories Data mining Parallel architectures Character recognition Tiles

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Harmonic insertion in PWM inverter drive schemes

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European Transactions on Electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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Enhanced Robustness for Pitch Pointing Flight Using Sliding Mode control

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IFAC Proceedings Volumes 1991年第1期24卷 369-374页

作者： M.E. Penati G. Bertoni C. Chen Electronics Computer Science and System Theory Dept. University of Bologna Viale Risorgimento 2 40136 Bologna Italy Dept. of Automatic Control Nanjing Aeronautical Institute Nanjing PRC

This paper proposes a methodology of combining eigenstructure assignment, feedforward gain with sliding mode control technique to realize an enhanced robust pitch pointing flight control system. This control system can track step input commands without error and it turns out to be consistently robust against parameter variations and external disturbances. The design methodology is illustrated by application to an AFTI/F-16 aircraft.

关键词： C.C.V. (A.C.T.) V.S.S. Sliding Mode Decoupling Robustness

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IMPROVED CHANGE TRACKING FOR SOFTWARE MAINTENANCE

IMPROVED CHANGE TRACKING FOR SOFTWARE MAINTENANCE

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1991 CONF ON SOFTWARE MAINTENANCE

作者： GARLAND, JK CALLISS, FW Software Tools Development Honeywell Industrial Automation and Control Phoenix 85023 AZ United States Dept. of Computer Science and Engineering Arizona State University Tempe 85287-5406 AZ United States

ISBN: (纸本)081862325X

With an ever increasing body of software to maintain and a small number ofexperiencedpersonnel, it is critical to improve software maintenance practice. One difficult problem maintenance organizations must address is how to document program evolution. Problem or change reporting and tracking is a key aspect of recording changes to large software systems. Large software systems which evolve over a long period of time magnify the need for organized change tracking due to the number and extent of the changes made. This paper describes a method to incorporate problem solving information in a change tracking database. Problem solving is discussed with regard to structured problem solving techniques for isolating difficult problems. A relational database structure and queries to access the database are discussed. An example of how the change tracking system supports the maintenance problem solving process is also included. © 1991 IEEE.

关键词： computer software maintenance

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A practical application of a numerical optimization technique in the feedmill industry

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engineering Optimization 1991年第1-3期18卷 107-120页

作者： Ramon, H. Vingerhoeds, R.A. Netten, B.D. Noldus, E. Catholic University of Louvain Dept. of Agricultural Engineering Leuven Kardinaal 3030 Mercierlaan 92 Belgium State University of Ghent Automatic Control Laboratory 9710 Gent - Zwijnaarde Grotesteenweg Noord 2 Belgium

The cow model of Meijer describes a mathematical relation between the predicted daily milk production and the corresponding feed intake needed for lactating cows. The milk production is a function of several parameters defined for each cow. Used in least cost calculations of daily rations, an optimization problem is obtained, which consists of one highly non-linear equality constraint, together with several linear inequality constraints. Their number required in the optimization can vary and depends on the user’s choice. The cost function itself gives a linear relation between the prices of the different forages mixed in the optimal blend. The optimization result has been implemented with the aid of Augmented Lagrange Functions with a view to apply the program in the feedmill industry. © 1991, Taylor & Francis Group, LLC. All Rights Reserved.

关键词： augmented Lagrange method cow-model of Meijer Numerical optimization quasi-Newton method

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A neuron-based pulse servo for motion control

A neuron-based pulse servo for motion control

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IEEE International Conference on Robotics and Automation (ICRA)

作者： S. De Weerth L. Nielsen C. Mead K. Astrom Dept. of Comput. Sci. California Inst. of Technol. Pasadena CA USA Department of Automatic Control Lund Institute of Technology Lund Sweden Department of Computer Science California Institute of Technology Pasadena CA USA

A design frame and a set of circuit elements with which generic motor controllers can be implemented are described. A simple proportional-derivative motor controller was embedded in the design frame. Its performance advantages over a more traditional controller are described. Also discussed are the merits of biologically inspired systems used in applications related to robotics.< >

关键词： Servomechanisms Motion control Robots Biology computing control systems Biological systems Size control Motion planning Integrated circuit technology automatic control

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computer-aided control engineering Environments: Architecture, User Interface, Data-base Management, and Expert Aiding

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IFAC Proceedings Volumes 1990年第8期23卷 337-348页

作者： J.H. Taylor D.K. Frederick C.M. Rimvall H.A. Sutherland Control systems Laboratory GE Corporate Research and Development P.O. Box 8 Schenfctady NY 12301 USA Dept. of Electrical Computer andd Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 USA

Modern CAD environments for control systems engineering have begun to support substantial functionality beyond modeling, numerical analysis, and simulation. Three major areas that have emerged in the last five years are advanced user interfaces, data-base management, and expert-systems support ("expert aiding"), In addition, there has been a steady thrust to integrate more completely the various functionalities and software that comprise computer-aided control engineering (CACE). These trends have produced CACE environments which have relatively modest improvements in numerical quality but a vastly different "feel" in terms of integration, support, and "user friendliness. The basic considerations and requirements for a CACE user interface (UI), data-base manager (DBM), and expert aicling are discussed in detail. In many cases, these will be illustrated by examples based on various CACE software suites including the new GE MEAD CACE environment; the basic thrust will be to define needs and show how these can be met. The GE MEAD Project involves the integration of powerful CACE packages under a supervisor which coordinates the execution of these packages with a modern UI, a CACE-oriented DBM, and an expert system. The user interface is designed to facilitate access to the CACE package capabilities by users with widely different levels of familiarity with the environment. The data-base manager keeps track of system models that evolve over time and associates each analysis or design result with the correct model instance. The expert system supplies the machinery for expert aiding complicated or heuristic procedures to free the user from low-level detail and tedium. This system thus exemplifies the trends mentioned above

关键词： computer-aided system design computer interfaces for CAD control engineering applications of computers data-base management systems expert systems software tools

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Model of Rail Current on Electrification Railway

Model of Rail Current on Electrification Railway

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Tenth International Wrocław Symposium on Electromagnetic Compatibility

作者： Li Shaojun Wu Yunxi Computer Center Northern Jiaotong Univ. Beijing 100044 P.R. China Dept. of Comm. and Control Engineering Northern Jiaotong Univ. Beijing 100044 P.R. China

ISBN: (纸本)9798331500092

The traction network is a strong current, unbalanced. nonlinear, multi-conductor, time-varying distributed parameter system. The rails are under such a sophisticated electromagnetic field. The model of the rails current cannot be created very well only by conventional transmission line theory. Based on the Maxwell equation, the authors regard the model from the view of both field and circuit and then put forward the mathematical mode! The earth effect is considered. The model can be applied to not only homogeneous earth but also multi-layer earth. In addition, many factors are taken into consideration. For instance, the resistive, inductive and capacitive coupling, the earth potential and the frequency response of the traction system. Such parameters as the earth conductivity and the ballast resistance were tested on the railway side. Finally, the authors solved the model in digital computer and analyses the error. The test equipments of the strong current were developed successfully by our research group at the department of Comm. and control in Northern Jiaotong University. We used the test equipments to have made an experiment on the railway spot. The results of the theoretical analysis turn out to be sound.

关键词： Rails Earth Mathematical models Impedance Electric potential Rail transportation Couplings Conductivity Admittance Substations

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MAXIMUM-LIKELIHOOD SOFT DECODING OF BINARY BLOCK-CODES AND DECODERS FOR THE GOLAY CODES

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IEEE TRANSACTIONS ON INFORMATION THEORY 1989年第5期35卷 963-975页

作者： SNYDERS, J BEERY, Y Department of Electronic Communications Control and Computer Systems School of Engineering Tel-Aviv University Ramat-Aviv Israel Dept. of Electron. Commun. Control & Comput. Syst. Tel-Aviv Univ. Ramat-Aviv Israel

Maximum-likelihood soft-decision decoding of linear block codes is addressed. A binary multiple-check generalization of the Wagner rule is presented, and two methods for its implementation, one of which resembles the suboptimal Forney-Chase algorithms, are described. Besides efficient soft decoding of small codes, the generalized rule enables utilization of subspaces of a wide variety, thereby yielding maximum-likelihood decoders with substantially reduced computational complexity for some larger binary codes. More sophisticated choice and exploitation of the structure of both a subspace and the coset representatives are demonstrated for the (24, 12) Golay code, yielding a computational gain factor of about 2 with respect to previous methods. A ternary single-check version of the Wagner rule is applied for efficient soft decoding of the (12, 6) ternary Golay code.< >

关键词： Maximum likelihood decoding Block codes Lattices Computational complexity Binary codes Information theory Parity check codes Maximum likelihood detection Conferences Communication system control

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Research group on fuzzy and probabilistic set theories and their applications, Gliwice (Poland)

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Fuzzy Sets and Systems 1988年第3期28卷 397-398页

作者： Czogala, Ernest Technical University Silesia Dept. of Automatic Control 44-101 Gliwice Electronics and Computer Sci. Pstrowskiego 16 Poland

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