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7th International Conference on Machine Learning, ICML 1990

作者： Chan, Keith C.C. Wong, Andrew K.C. PAMI Laboratory Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada

ISBN: (纸本)1558601414

This paper presents a new method for acquiring classificatory knowledge by induction. Based on a probabilistic inference technique, this method allows inherent patterns in noisy training instances to be easily detected. A set of classification rules can then be constructed based on these detected patterns. The proposed method has been evaluated by testing it with some real-world data sets and the results show that it out-performs some decision-tree based algorithms both in terms of computational efficiency and classification accuracy. © 1990 Proceedings of the 7th International Conference on Machine Learning, ICML 1990. All rights reserved.

关键词： Computational efficiency

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Characterizing and modelling a sonar ring

Characterizing and modelling a sonar ring

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Mobile Robots IV 1989

作者： Lang, Sherman Y.T. Korba, Larry W. Wong, Andrew K.C. Laboratory for Biomedical Engineering National Research Council of Canada Bldg M-50 OttawaONK1A 0R8 Canada Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada

Effective sensor integration requires knowledge of the characteristics of all sensor subsystems. This type of meta-knowledge can originate from theoretical models of the physical processes involved in the sensing, from actual testing of the sensory system or from a combination of both. This paper describes the collection and analysis of experimental data from an actual sonar ring. The effective beam pattern is mapped and modeled for the eight possible setting combinations of pulse width and gain profiles, using three different sizes of targets. The beam cross sectional characteristics are also analyzed to show the effective signal strength and its effect upon error in the depth readings. The performance of the system is highly dependent upon surface texture and orientation, and other tests of the sonar ring illustrate the types of artifacts which arise in the actual use of the system. The test results can be used to provide better certainty values in certainty grid representations, or used to build a boundary representation from a composite scan which integrates the data from the scans at different settings. The test results are shown graphically. © 1990 SPIE. All rights reserved.

关键词： Textures

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Building geometric world models with graph synthesis for sensor fusion in mobile robots

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Computational Intelligence 1990年第2期6卷 91-107页

作者： Lang, Sherman Y. T. Wong, Andrew K. C. Laboratory for Biomedical Engineering National Research Council of Canada Ottawa Ontario KIA 0R6 Canada Department of Systems Design Engineering University of Waterloo Waterloo N2L 3GI Canada

This paper presents a description of the application of an attributed graph based approach to the synthesis of a geometric world model for use in navigation by a mobile robot. Our aim is to develop the theoretical aspects of graph synthesis for mobile robot world knowledge acquisition, and to demonstrate the validity of the approach with a simulation before implementation on the rover. A boundary representation of free space consisting of directed line segments organized into a directed attributed graph is used. The synthesis problem can be considered as having two parts: matching of a local model with a global model and the construction of a new global model. Structural and geometric local and global constraints are used to limit and direct the search for valid graph mappings. The constraints are the source of rules for matching primitives and graphs and are used in the process of constructing a new world model graph. An algorithm for graph synthesis is implemented in a software simulation for testing and experimentation. Copyright © 1990, Wiley Blackwell. All rights reserved

关键词： attributed graph geometric knowledge representation graph isomorphism graph synthesis mobile robot world model acquisition

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COMPUTER-SYSTEM ARCHITECTURE CONCEPTS FOR FUTURE COMBAT systems

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 43-62页

作者： ZITZMAN, LH FALATKO, SM PAPACH, JL Dr. Lewis H. Zitzman:is the group supervisor of the Advanced Systems Design Group Fleet Systems Department The Johns Hopkins University Applied Physics Laboratory (JHU/APL). He has been employed at JHU/APL since 1972 performing applied research in computer science and in investigating and applying advanced computer technologies to Navy shipboard systems. He is currently chairman of Aegis Computer Architecture Data Bus and Fiber Optics Working Group from which many concepts for this paper were generated. Dr. Zitzman received his B.S. degree in physics from Brigham Young University in 1963 and his M.S. and Ph.D. degrees in physics from the University of Illinois in 1967 and 1972 respectively. Stephen M. Falatko:was a senior engineering analyst in the Combat Systems Engineering Department Comptek Research Incorporated for the majority of this effort. He is currently employed at ManTech Services Corporation. During his eight-year career first at The Johns Hopkins University Applied Physics Laboratory and currently with ManTech Mr. Falatko's work has centered around the development of requirements and specifications for future Navy systems and the application of advanced technology to Navy command and control systems. He is a member of both the Computer Architecture Fiber Optics and Data Bus Working Group and the Aegis Fiber Optics Working Group. Mr. Falatko received his B.S. degree in aerospace engineering with high distinction from the University of Virginia in 1982 and his M.S. degree in applied physics from The Johns Hopkins University in 1985. Mr. Falatko is a member of Tau Beta Pi Sigma Gamma Tau the American Society of Naval Engineers and the U.S. Naval Institute. Janet L. Papach:is a section leader and senior engineering analyst in the Combat Systems Engineering Department Comptek Research Incorporated. She has ten years' experience as an analyst supporting NavSea Spa War and the U.S. Department of State. She currently participates in working group efforts under Aegis Combat System Doctrin

This paper sets forth computer systems architecture concepts for the combat system of the 2010–2030 timeframe that satisfy the needs of the next generation of surface combatants. It builds upon the current Aegis computer systems architecture, expanding that architecture while preserving, and adhering to, the Aegis fundamental principle of thorough systems engineering, dedicated to maintaining a well integrated, highly reliable, and easily operable combat system. The implementation of these proposed computer systems concepts in a coherent architecture would support the future battle force capable combat system and allow the expansion necessary to accommodate evolutionary changes in both the threat environment and the technology then available to effectively counter that threat. Changes to the current Aegis computer architecture must be carefully and effectively managed such that the fleet will retain its combat readiness capability at all times. This paper describes a possible transition approach for evolving the current Aegis computer architecture to a general architecture for the future. The proposed computer systems architecture concepts encompass the use of combinations of physically distributed, microprocessor-based computers, collocated with the equipment they support or embedded within the equipment itself. They draw heavily on widely used and available industry standards, including instruction set architectures (ISAs), backplane busses, microprocessors, computer programming languages and development environments, and local area networks (LANs). In this proposal, LANs, based on fiber optics, will provide the interconnection to support system expandability, redundancy, and higher data throughput rates. A system of cross connected LANs will support a high level of combat system integration, spanning the major warfare areas, and will facilitate the coordination and development of a coherent multi-warfare tactical picture supporting the future combatant command st

关键词： Computer Architecture

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FLAMMABILITY AND TOXICITY OF COMPOSITE-MATERIALS FOR MARINE VEHICLES

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 45-54页

作者： SEVART, JL GRIFFIN, OH GURDAL, Z WARNER, GA Jeffrey L. Sevart:is a native of Kansas and a 1985 graduate of Kansas State University with a B.S. in mechanical engineering (magna cum laude). After working as a stress analysis engineer at Boeing Military Airplane Company in Wichita Kans. he attended Virginia Polytechnic Institute and State University and received an M.S. in engineering mechanics in February 1988. He currently resides in Akron Ohio working as a research engineer in tire composites research at The Goodyear Tire and Rubber Company. O. Hayden Griffin Jr.:received his B.S. and M.S. in mechanical engineering from Texas Tech University in 1970 and 1971 respectively. He received his Ph.D. in engineering mechanics from Virginia Polytechnic Institute and State University in 1980. Prior to joining the faculty of Virginia Polytechnic Institute and State University as associate professor of engineering science and mechanics in September 1985 he was employed at the U.S. Naval Surface Warfare Center (Dahlgren Virginia) BF Goodrich Tire Group (Akron Ohio) the Bendix Advanced Technology Center (Columbia Maryland) and the Johns Hopkins University Applied Physics Laboratory (Laurel Maryland). He is currently an associate director of the Virginia Institute for Material Systems. He is a registered professional engineer in Virginia and is a member of the American Society of Mechanical Engineers and the American Society for Composites. Zafer Gürdal:received his M.S. in mechanical and aerospace engineering from Illinois Institute of Technology in 1981 and his Ph.D. in aerospace engineering from Virginia Polytechnic Institute and State University in 1985. He worked as a research associate in the Aerospace and Ocean Engineering Department at Virginia Tech before joining the Engineering Science and Mechanics Department as an assistant professor in September 1985. Professor Gürdal's research interests include: composite structures failure mechanics of composites structural optimization and damage tolerant design. He is a member of the American Institute

Characteristics of both thermoplastic and thermoset composite materials as they pertain to marine vehicle applications are discussed. Comparison of various material selection factors such as strength, damage and moisture resistance, and flammability and toxicity as well as cost and availability of thermoset and thermoplastic composite materials are presented. Methods for testing and reducing the flammability and toxicity are discussed. Many commercially available composite systems are reported to provide favorable characteristics for marine applications. Although there seems to be a need for improved production technology for thermoplastics, they present potential advantages in physical properties over thermoset composites.

关键词： Composite Materials

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An architecture for integrating expert systems

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Decision Support systems 1989年第3期5卷 263-276页

作者： Fraser, Niall M Hipel, Keith W Kilgour, D.Marc McNeese, Michael D Snyder, Daniel E Department of Management Sciences University of Waterloo Waterloo Ont. Canada Department of Systems Design Engineering University of Waterloo Waterloo Ont. Canada Department of Mathematics Wilfrid Laurier University Waterloo Ont. Canada Harry G. Armstrong Aerospace Medical Research Laboratory Wright-Patterson Air Force Base OH United States Harry G. Armstrong Aerospace Medical Research Laboratory Wright-Patterson Air Force Base OH United States

A conflict resolver is developed for mediating disputes arising among competing expert systems (ESs). The conflict resolver constitutes the key component of an overall decision support system designed for controlling a complex system or supporting the decision making of a human operator within the system. When competing ESs make conflicting recommendations for controlling the system, the conflict resolver uses a Delphi-like mediation to achieve a compromise solution. The mathematical framework for the comprehensive conflict resolution system is defined formally, and it is proven that the conflict resolver always reaches a consistent recommendation. © 1989.

关键词： Competing Expert systems Conflict Resolver Delphi-like Mediation

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A comparison of processor topologies for a fast trainable neural network for speech recognition

A comparison of processor topologies for a fast trainable ne...

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

作者： Y. Suzuki L.E. Atlas Department of Electrical Engineering FT-10 Interactive Systems Design Laboratory University of Washington Seattle WA USA Language Media Laboratory NTT Human Interface Laboratories Kanagawa Japan

A fast processing system is necessary to provide adequate learning speed in multilayer neural networks (NNs). Some schemes for mapping from a multilayer NN to a parallel digital processor topology are discussed. For a mesh topology there exists an optimal point where the computation count is minimum. In order to allow for applications such as a speaker-independent speech recognizer, the authors extend this mesh architecture to operate on sequential or, specifically, spatio-temporal inputs. A pipelining scheme is thus revealed, making it possible to improve the processing throughput. An extension of the processing element structure is obtained by introducing dynamic neurons and a consequent pipelining architecture.< >

关键词： Network topology Neural networks Speech recognition Very large scale integration Laboratories Multi-layer neural network Computer architecture Pipeline processing Neurons Natural languages

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VISUALIZATION METHODS FOR THE STUDY OF UNSTEADY NON-PREMIXED JET FLAME STRUCTURE

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COMBUSTION SCIENCE AND TECHNOLOGY 1988年第4-6期59卷 455-461页

作者： VANDSBURGER, U SEITZMAN, JM HANSON, RK Department Of Systems Design University Of Waterloo Waterloo Ontario Canada High Temperature Gasdynamics Laboratory Department of Mechanical Engineering Stanford University Stanford California 94305-3032

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PIS: a probabilistic inference system

PIS: a probabilistic inference system

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International Conference on Pattern Recognition

作者： K.C.C. Chan A.K.C. Wong PAMI Laboratory Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada

A method is proposed for probabilistic interference through empirical observations involving categorical data. This method can detect statistically independent patterns inherent in a set of observed events. The evidence provided by the patterns for or against some hypotheses generated during the inference process are then quantitatively estimated and combined to find the most plausible hypotheses. The proposed method has been implemented for the Probabilistic Inference System (PIS). Because it can detect patterns in observed or inferred events which may not be directly observable, the PIS can be used to aid decision-making in the presence of uncertainty. It has been tested with simulated as well as real-life data, and the results are very satisfactory.< >

关键词： Event detection Artificial intelligence Random variables Laboratories Data engineering design engineering systems engineering and theory Decision making Uncertainty Testing

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Observer: A probabilistic learning system for ordered events 4th

Observer: A probabilistic learning system for ordered events

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4th International Conference on Pattern Recognition, 1988

作者： Chan, Keith C. C. Wong, Andrew K. C. Chiu, David K. Y. PAMI Laboratory Department of Systems Design Engineering University of Waterloo ONN2L 3G1 Canada Department of Computing and Information Science University of Guelph ONN1G 2W1 Canada

ISBN: (纸本)9783540190363

Given a sequence of observed events which are ordered with respect to time or positions and are described by the coexistence of several discrete-valued attributes that are assumed to be generated by a random process, the inductive prediction problem is to find the probabilistic patterns that characterize the random process, thereby, allowing future events to be predicted. This paper presents a probabilistic inference technique for solving such a problem. Based on it, a learning program called the OBSERVER has been implemented. The OBSERVER can learn, inductively and without supervision, even if some observed events could be erroneous, occasionally missing, or subject to certain degrees of uncertainty. It is able to reveal the patterns and regularities inherent in a sequence of observed events and can not only specify, in a clearly defined way, the happenings in the past but also gain insight for prediction. The proposed technique can be applied to solve different problems in artificial intelligence (AI) and pattern recognition (PR) where decisions concerning the future have to be made. © 1988, Springer-Verlag.

关键词： Random processes

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