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Midwest Symposium on Circuits and systems (MWSCAS)

作者： N.H. Ningo S.Y. Kwankam J.B. Bilikha Automation and Control Laboratory Department of Electrical Engineering Ecole Nationale Superieure Polytechnique University of Yaoundé Cameroon Dept. of Electr. Eng. Yaounde Univ. Cameroon

A recently introduced baseband digital technique for electric power line communication using power signal waveform modification is discussed, and its error probability performance is studied as a function of critical parameters of the technique and signal-to-noise ratio. The technology, which is insensitive to fluctuations in power signal amplitude, frequency, and waveshape, is a generalized form of amplitude shift keying, dubbed partial amplitude shift keying.< >

关键词： Error probability Digital communication Amplitude shift keying Communication system control Baseband Signal detection Additive noise automation Automatic control Laboratories

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Object oriented database using frames in second generation APL 90

Object oriented database using frames in second generation A...

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International Conference on the APL Programing Language, APL 1990

作者： Pantziarka, Panagiotis Control Systems Research Centre Dept. Electrical and Electronic Engineering South Bank Polytechnic Borough Rd. LondonSE1 0AA United Kingdom

ISBN: (纸本)089791371X

The appeal of Object Oriented systems and methodologies is that they provide conceptually simple and powerful tools to represent the real-world. The essential elements of object orientation include: information hiding, classes, dynamic instantiation of objects, methods and the inheritance of properties by objects. Frames are a way to combine both data and procedures to represent knowledge. This paper describes a frame representation system that is used to create a simple object oriented database. The frame structures are described and it is shown that they can be represented as nested arrays. The inheritance mechanisms are detailed and functions developed to handle the frames. Finally a proposal is made for the further development of frame structured systems in APL. © 1990 ACM.

关键词： Object-oriented databases

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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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GRAPHICAL CORRESPONDENCE IN ELECTRONIC-MAIL NETWORKS USING PERSONAL COMPUTERS

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 1989年第2期7卷 257-267页

作者： ARNBAK, JC BONS, JH VIEVEEN, JW Telecommunications and Traffic Control Systems Group Department of Electrical Engineering Delft University of Technnology Delft Netherlands Dept. of Electr. Eng. Delft Univ. of Technol. Netherlands

A telegraphic technique for electronic-mail correspondence between industry-standard PC facilities equipped with a writing tablet is described. Algorithms for encoding graphical information into the fixed-word format used in the common message-handling architectures are discussed. It is proposed to adopt differential chain encoding which allows an efficient representation of graphics as strings of ASCII-compatible bytes. telematic service that is feasible with this PC networking approach is compared to standard facsimile transmission of compound documents with text and graphics.

关键词： Micro computer TELEPHOTOGRAPHY(FACSIMILE) graphic images writing tablet algorithms electronic mail Correspondence Cosmic strings

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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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Knowledge based system to diagnose faults in discrete event systems 89

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2nd International Conference on Industrial and engineering Applications of Artificial Intelligence and Expert systems, IEA/AIE 1989

作者： Sitaram, Muralidhar Ernst, George Marcuse, John Quintus Computer Systems Inc. 1310 Villa Street Mountain ViewCA94041 United States Dept. of Computer Engineering and Science Center of Automation and Intelligent Systems Research Case Western Reserve University ClevelandOH44106 United States Reliance Electric Company ClevelandOH44117 United States

ISBN: (纸本)0897913205

This paper describes a Fault Explanation System (FES) that AIDS in the diagnosis of failures in discrete event systems such as certain manufacturing processes. These systems are characterized by the use of programmable logic controllers (PLC) to control the systems. In addition PLC's also perform event logging. The event log (fault log) records exceptions which may be alarms, warnings or status reports. A major difficulty is that most of the alarms do not indicate real faults in the system;for example, a fault may cause an exception which indicates what the fault is, but this exception may also give rise to a number of other exceptions which are just side-effects. FES interprets and explains faults in the log based on a model provided by the ladder logic diagrams of the PLC. These explanations separate real exceptions from the kind of side-effects described above. Finally FES ranks explanations according to their plausibility. © 1989 ACM.

关键词： Discrete event simulation

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An expert supervisor for a robotic work cell

An expert supervisor for a robotic work cell

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Intelligent Robots and Computer Vision VI 1987

作者： Moed, M.C. Kelley, R.B. Robotics and Automation Laboratories Electrical Computer and Systems Engineering Dept. Rensselaer Polytechnic Institute TroyNY12180-3590 United States

To increase task flexibility in a robotic assembly environment, a hierarchical planning and execution system is being developed which will map user-specified 3D part assembly tasks into various target robotic work cells, and execute these tasks efficiently using manipulators and sensors available in the work cell. One level of this hierarchy, the Supervisor, is responsible for assigning subtasks of a system-generated Task Plan to a set of task specific Specialists and on-line coordination of the activity of these Specialists to accomplish the user-specified assembly. The design of the Supervisor can be broken down into five major functional blocks: resource management;concurrency detection;task scheduling;error recovery;and interprocess communication. The Supervisor implementation has been completed on a VAX 11/750 under a Unix environment. PC card Pick-Insert experiments were performed to test this implementation. To test the robustness of the architecture, the Supervisor was then transported to a new work cell under a VMS environment. The experiments performed under Supervisor control in both implementations are discussed after a brief explanation of the functional blocks of the Supervisor and the other levels in the hierarchy. © 1988 SPIE. All rights reserved.

关键词： Supervisory personnel

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Heterogeneous neural networks for adaptive behavior in dynamic environments 88

Heterogeneous neural networks for adaptive behavior in dynam...

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Proceedings of the 2nd International Conference on Neural Information Processing systems

作者： Hillel J. Chiel Randall D. Beer Leon S. Sterling Biology Dept. & CAISR CWRU Dept. of Computer Engineering and Science and Center for Automation and Intelligent Systems Research Case Western Reserve University Cleveland OH CS Dept. & CAISR CWRU

Research in artificial neural networks has generally emphasized homogeneous architectures. In contrast, the nervous systems of natural animals exhibit great heterogeneity in both their elements and patterns of interconnection. This heterogeneity is crucial to the flexible generation of behavior which is essential for survival in a complex, dynamic environment. It may also provide powerful insights into the design of artificial neural networks. In this paper, we describe a heterogeneous neural network for controlling the walking of a simulated insect. This controller is inspired by the neuroethological and neurobiological literature on insect locomotion. It exhibits a variety of statically stable gaits at different speeds simply by varying the tonic activity of a single cell. It can also adapt to perturbations as a natural consequence of its design.

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The strategic design driven inspection of machined parts

The strategic design driven inspection of machined parts

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International Conference on Computer Integrated Manufacturing

作者： J.M. Galm F.L. Merat Dept. of Electr. Eng. & Appl. Phys. Case Western Reserve Univ. Cleveland OH USA Center for Automation and Intelligent Systems Research Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland OH USA

A system for the automatic dimensional inspection of machined industrial parts is under development. Key attributes of the system are its use of design knowledge, i.e. the CAD (computer-aided design) description of the part to be inspected and the strategic use of diverse sensors to generate geometric descriptions of the actual part being inspected as well as the designer's conception of the part. Inspection reduces to the simple comparison of all components of the two models with a correct interpretation of the designer's specified tolerances. Sensors are used in a strategic manner, low-cost sensors, such as those for vision, are used for low-tolerance measurements, and higher-cost sensors, such as coordinate-measuring machines or surface probes, are used to refine object features until all object features have been compared between the CAD model and the actual object being inspected.< >

关键词： Inspection Design automation Sensor phenomena and characterization Coordinate measuring machines Solid modeling Sensor systems Ultrasonic variables measurement Optical sensors Intelligent systems Machine intelligence

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A communication network for distributed process control systems

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IFAC Proceedings Volumes 1987年第14期20卷 85-95页

作者： U. Grossniklaus H. Siebert Development Department of Systems for Automation and Control Brown Boveri & Company Dept. ESL-3 Baden Switzerland Brown Boveri Research Center Heidelberg FRG

A bus structured local area network for distributed process control systems is introduced. The general requirements for such a local area network are listed. The features of the network are introduced and the arbitration methods are discussed. Two arbitration methods in order to achieve the best use of the bandwidth of the network are implemented. On the one hand cyclic transmission of data, on the other hand event driven transmission is used. Two arbitration methods for event driven transmission are shown: a solution which uses event polling and a solution which uses collision detection and collision resolution to resolve concurrent bus requests. Both solutions are discussed. The expected performance of the solutions are shown.

关键词： control system communication multi-access-systems broadcasting adaptive polling

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