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Wilson-Cowan neural-network model in image processing

Journal of Mathematical Imaging and Vision 1992年第2-3期2卷 251-259页

作者： Mantere, Kari Parkkinen, Jussi Jaaskelainen, Timo Gupta, Madan M. Department of Applied Physics University of Kuopio Kuopio SF-70211 P.O. Box 1627 Finland Department of Computer Science and Applied Mathematics University of Kuopio Kuopio SF-70211 P.O. Box 1627 Finland Department of Physics University of Joensuu Joensuu SF-80101 P.O. Box 111 Finland Intelligent Systems Research Laboratory College of Engineering University of Saskatchewan Saskatoon S7N 0W0 Saskatchewan Canada

The neural-network model based on the theory proposed by Wilson and Cowan has been simulated by using digitized real images. Mathematically, the model is based on coupled nonlinear differential equations that describe the functional dynamics of cortical nervous tissue, and the model can operate in different dynamical modes, depending on coupling strengths. The model is shown to store images in reduced form and to recognize edges of an object. Examples of how the network processes input images are shown. © 1992 Kluwer Academic Publishers.

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Parameter value computation by least square method and evaluation of software availability and reliability at service-operation by the hyper-geometric distribution software reliability growth model (HGDM) 91

Parameter value computation by least square method and evalu...

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Proceedings of the 13th international conference on software engineering

作者： Raymond Jacoby Yoshihiro Tohma TOSHIBA Corporation Systems & Software Engineering Laboratory Saiwat-ku Kawasaki-shi 210 Japan and Department of Computer Science Tokyo Institute of Technology Ookayama 2-12-1 Meguro-Ku Tokyo Department of Computer Science Tokyo Institute of Technology Ookayama 2-12-1 Meguro-Ku Tokyo

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ROLE OF SIMULATION IN RAPID PROTOTYPING FOR CONCEPT DEVELOPMENT

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 204-211页

作者： KING, JF BARTON, DE J. Fred King:is the manager of the Advanced Technology Department for Unisys in Reston Virginia. He earned his Ph.D. in mathematics from the University of Houston in 1977. He has been principal investigator of research projects in knowledge engineering pattern recognition and heuristic problem-solving. Efforts include the development of a multi-temporal multispectral classifier for identifying graincrops using LANDSAT satellite imagery data for NASA. Also as a member of the research team for a NCI study with Baylor College of Medicine and NASA he helped develop techniques for detection of carcinoma using multispectral microphotometer scans of lung tissue. He established and became technical director of the AI Laboratory for Ford Aerospace where he developed expert scheduling modeling and knowledge acquisition systems for NASA. Since joining Unisys in 1985 he has led the development of object-oriented programming environments blackboard architectures data fusion techniques using neural networks and intelligent data base systems. Douglas E. Barton:is manager of Logistics Information Systems for Unisys in Reston Virginia. He earned his B.A. degree in computer science from the College of William and Mary in 1978 and did postgraduate work in London as a Drapers Company scholar. Since joining Unisys in 1981 his work has concentrated on program management and software engineering of large scale data base management systems and design and implementation of knowledge-based systems in planning and logistics. As chairman of the Logistics Data Subcommittee of the National Security Industrial Association (NSIA) he led an industry initiative which examined concepts in knowledge-based systems in military logistics. His responsibilities also include evaluation development and tailoring of software engineering standards and procedures for data base and knowledge-based systems. He is currently program manager of the Navigation Information Management System which provides support to the Fleet Ballistic Missile Progr

A valuable technique during concept development is rapid prototyping of software for key design components. This approach is particularly useful when the optimum design approach is not readily apparent or several known alternatives need to be rapidly evaluated. A problem inherent in rapid prototyping is the lack of a "target system" with which to interface. Some alternatives are to develop test driver libraries, integrate the prototype with an existing working simulator, or build one for the specific problem. This paper presents a unique approach to concept development using rapid prototyping for concept development and scenario-based simulation for concept verification. The rapid prototyping environment, derived from artificial intelligence technology, is based on a blackboard architecture. The rapid prototype simulation capability is provided through an object-oriented modeling environment. It is shown how both simulation and blackboard technologies are used collectively to rapidly gain insight into a tenacious problem. A specific example will be discussed where this approach was used to evolve the logic of a mission controller for an autonomous underwater vehicle.

关键词： Military engineering

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Applying Petri net reduction to support Ada-tasking deadlock detection

Applying Petri net reduction to support Ada-tasking deadlock...

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International Conference on Distributed Computing systems

作者： S. Tu S.M. Shatz T. Murata Software Systems Laboratory Department of Electrical Engineering and Computer Science University of Illinois Chicago Chicago IL USA

The application of Petri net reduction to Ada-tasking deadlock detection is investigated. Net reduction can ease reachability analysis by reducing the size of the net while preserving relevant properties. By combining Petri net theory and knowledge of Ada-tasking semantics some specific efficient reduction rules are derived for Petri net models of Ada-tasking. A method by which a useful description of a detected deadlock state can be easily obtained from the reduced net's information is suggested.< >

关键词： System recovery Algorithm design and analysis Petri nets Information analysis software systems Laboratories Reachability analysis Face detection FETs Displays

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THE COMMAND SUPPORT AT-SEA EXPERIMENT

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 25-36页

作者： BUSCHER, DJ SUNDAY, DM David J. Buscher:is an electrical engineer on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his BS degree in electrical engineering from Villanova University in 1967 an MSEE degree from the University of Maryland in 1972 and an MS degree in technical management from The Johns Hopkins University in 1985. He was the lead engineer on the Command Support At-Sea Experiment Project. He started his career in 1967 with the U.S. Army Harry Diamond Laboratory working on computer and communications projects. During this time he worked in Vietnam with the United States Army Vietnam Science Advisor Office. Since joining JHU/APL in 1978 he has worked on a variety of projects associated with computer graphics hospital patient information systems computer networks autonomous underwater vehicles and satellite communications. He is currently assistant group supervisor of the Computer Systems Group. Daniel M. Sunday:is a mathematician on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his Ph.D. in mathematics from the University of Minnesota in 1971 and did postdoctoral research on neural networks at the University of California at Berkeley. Since joining JHU/APL in 1980 Dr. Sunday has worked as a designer and developer of software systems with emphasis on medical imaging interactive graphics natural language interfaces and software standards. He was the network designer for the Headquarters Integrated Office System (HIOS) Network for the Army at the Pentagon. He is currently the lead software engineer on the Command Support At-Sea Experiment Project.

The Command Support At-Sea Experiment (CS@SE) provides experimental advanced graphics display systems consisting of large screen color displays and operator console color displays in the combat information center (CIC) of an Aegis cruiser and in the tactical flag command center (TFCC) of an aircraft carrier. CS@SE systems are designed to prototype potential command support capabilities in an at-sea environment to validate and refine requirements for planned production system upgrades. These systems use sophisticated color graphics techniques to provide real-time tactical displays that improve the availability of information to an operator by reducing clutter through the use of color, area fill, transparen overlays and intensity coding of track symbols. Interfaces wen developed with the Aegis Display System (ADS), Shipboarc Gridlock System with Auto-correlation (SGS/AC), Flag Dats Display System (FDDS) and Tomahawk Engagement Planning and Exercise Evaluation System (TEPEE) that provided the data for the presentation of a tactical display. Display elements included both real-time and over-the-horizon (OTH) surface track data, velocity leaders, tags, uncertainty ellipses, and history trails. The display also included filled land masses, country boundaries, commercial airways, cities, graphics overlays (i.e., operational areas), weapon system missile performance contours, and engagement plans. This paper describes the experiment, its installation and integration into the shipboard environments of an Aegis cruiser (USS Leyte Gulf ) and an aircraft carrier (USS America , its usage by the ships companies and embarked staffs, and the experiment result! and findings. Key conclusions of the experiment are: 1 Advanced graphics color displays can significantly enhance the ability of the warfighter to assimilate a complex tactical display. 2 Both ships reported a requirement for a correlated OTH and real-time track display with the ability to clearly differentiate the two types

关键词： computer Graphics

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Responses to “An Al view of the treatment of uncertainty” by Alessandro Saffiotti

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The Knowledge engineering Review 1988年第1期3卷 59-86页

作者： Clark, Dominic A. Prade, Henri Imperial Cancer Research Fund Laboratories London WC2A 3PX 44 Lincoln’s Inn Fields United Kingdom Engineering Mathematics Department University of Bristol United Kingdom NASA Ames Research Cenler/Heer Associates Inc. Mail slop: 244-17 Moffell Field CA 94040 United States Experimental Knowledge Systems Laboratory Department of Computer and Information Science University of Massachusetts Amherst Mass 01004 United States Laboratoire Langages et Systèmes Informatiques Université Paul Sabatier 118 route de Narbonne 31062 TOULOUSE Cédex France Imperial Cancer Research Fund Laboratories 44 Lincoln’s Inn Fields London WC2A 3PX United Kingdom Knowledge Systems Concepts Inc. Rome NY 13440 Italy MRC Biostatistics Unit Cambridge CB2 2BW United States IRIDIA Université Libre de Bruxelles 50 av. F. Roosevelt CP 194/6 1050 Bruxelles Belgium Computer Science Division University of California Berkeley CA 94720 United States

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On terrain acquisition by a finite-sized mobile robot in plane

On terrain acquisition by a finite-sized mobile robot in pla...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： N. Rao S. Iyengar C. Jorgensen C. Weisbin Department of Computer Science Louisiana State University Baton Rouge LA Engineering Physics and Mathematics division Center for Engineering Systems Advanced Research Oak Ridge National Laboratory Oak Ridge TN

The terrain acquisition problem deals with the acquisition of the complete obstacle terrain model by a mobile robot placed in an unexplored terrain. This is a precursory problem to many well-known find-path and related problems which assume the availability of the complete terrain model. In this paper, we present a method for terrain acquisition by a finite-sized robot operating in plane populated by an unknown (but, finite) number of polygonal obstacles; each obstacle is arbitrarily located and has unknown (but, finite) number of vertices. The robot progressively explores newer vertices of the obstacles using sensor equipment. We show that the complete terrain model will be built by the robot in a finite time. We also show that at any point of time the partially acquired terrain suffices for the navigation of the robot during the exploration. Hence we conclude that the navigation techniques for known terrains can be applied for the robot navigation during exploration.

关键词： Mobile robots Robot sensing systems Navigation Rain Power engineering and energy systems engineering and theory computer science Motion planning Shape Contracts

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Concurrent algorithms for autonomous robot navigation in an unexplored terrain

Concurrent algorithms for autonomous robot navigation in an ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： S. Rao S. Iyengar C. Jorgensen C. Weisbin Department of Computer Science Louisiana State University Baton Rouge LA USA Engineering Physics and Mathematics division Center for Engineering Systems Advanced Research Oak Ridge National Laboratory Oak Ridge TN USA

Navigation planning is one of the most vital aspects of an autonomous mobile robot. The problem of navigation in a completely known obstacle terrain is solved in many cases. Comparatively less number of research results are reported in literature about robot navigation in a completely unknown obstacle terrain. In recent times, this problem is solved by imparting the learning capability to the robot. The robot explores the obstacles terrain using sensors and incrementally builds the terrain model. As the robot keeps navigating, the terrain model becomes more learned and the usage of sensors is reduced. The navigation paths are computed by making use of the existing terrain model. The navigation paths gradually approach global optimality as the learning proceeds. In this paper, we present concurrent algorithms for an autonomous robot navigation in an unexplored terrain. These concurrent algorithms are proven to be free from deadlocks and starvation. The performance of the concurrent algorithms is analyzed in terms of the planning time, travel time, scanning time, and update time. The analysis reveals the need for an efficient data structure for the obstacle terrain in order to reduce the navigation time of the robot, and also to incorporate learning. The modified adjacency list is proposed as a data structure for the spatial graph that represents the obstacle terrain. The time complexities of various algorithms that access, maintain, and update the spatial graph are estimated, and the effectiveness of the the implementation is illustrated.

关键词： Navigation Robot sensing systems Robot kinematics Mobile robots Data structures Robotics and automation Concurrent computing systems engineering and theory Orbital robotics Chromium

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A computer INTEGRATED engineering SYSTEM FOR DESIGN AND LIFE-CYCLE MANAGEMENT

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NAVAL ENGINEERS JOURNAL 1986年第3期98卷 115-121页

作者： NICKODEMUS, GH YANUS, ID Irwin D. Yanusgraduated from the University of Pennsylvania with a bachelor's degree in arts and science in 1960 and a bachelor of science degree in mechanical engineering in 1961. In 1963 he received a master of science degree in mechanical engineering from Carnegie-Mellon University. Mr. Yanus is presently the manager of naval systems engineering in the Computer Aided Engineering Department of the Plant Engineering Division of Westinghouse Electric Corporation. His prior experience includes 19 years at the Bettis Atomic Power Laboratory where he performed assignments of increasing responsibility in design analysis development and procurement of nuclear reactor components for naval applications. As the manager of reactor mechanical design he was responsible for the mechanical design of theNimitzclass reactor components and control drive mechanism technology development. Mr. Yanus is a member of the American Society of Mechanical Engineers and the Society of Naval Architects and Marine Engineers. Glen H. Nickodemusgraduated from Michigan State University in 1964 with a bachelor of science degree in civil engineering. He joined the Pittsburgh-Des Moines Corporation in July of the same year. A master of science degree in civil engineering was obtained from Carnegie-Mellon University in 1973. In 1969 Mr. Nickodemus joined the Advanced Reactors Division of the Westinghouse Electric Corporation where he performed design and structural analysis functions for the development of the Fast Flux Test Facility and Clinch River Breeder Reactor Plant (CRBRP). As manager of CRBRP reactor engineering stress analysis he was responsible for the reactor vessel internals closure head control rod drivelines and miscellaneous guard vessels and head access area components. He is currently the manager of software development for the Computer Aided Engineering Department of the Plant Engineering Division. Mr. Nickodemus is a member of the American Society of Mechanical Engineers and is a registered professional engineer in Penn

This paper describes a computer integrated engineering system for design and life cycle management of weapons systems, ships and other multidisciplined systems. All engineering data are stored in a central engineering database. Individual application databases define and process information necessary for specific discipline evaluations. Interface modules between the application databases and the engineering database ensure that the entered data are complete, consistent, compatible, and in compliance with requirements. Conflicts are immediately identified and efficiently resolved. Implementation of the system improves design quality and reduces costs by minimizing the number of design iterations, reducing the effort to implement changes, providing effective storage and retrieval, and reducing the need for ship checks prior to modifications and alterations.

关键词： MILITARY engineering

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PLANE STEADY SHEAR FLOW OF A COHESIONLESS GRANULAR MATERIAL DOWN AN INCLINED PLANE: A MODEL FOR FLOW AVALANCHES. PART I: THEORY.

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Acta Mechanica 1985年第1-4期63卷 87-112页

作者： Hutter, K. Szidarovszky, F. Yakowitz, S. Laboratory of Hydraulics Hydrology and Glaciology ETH Zürich Gloriastrasse 37 Zürich CH-8092 Switzerland Department of Mathematics and Computer Science University of Horticulture Villanyi u 29-35 Budapest XI H-1118 Hungary Department of Systems and Industrial Engineering University of Arizona Tucson 85721 AZ United States

A continuum mechanical model describing rapid shear flow of granular materials as deduced by J. T. Jenkins and S. B. Savage from considerations of statistical mechanics is applied to steady plane shear flows down an inclined chute. Depending on the type and form of the physically suggested boundary conditions that are imposed at the base and the free surface, respectively, the merging boundary value problems permit or prohibit existence of mathematical solutions. Differential equations and boundary conditions are presented and a procedure of non-dimensionalization is suggested which yields dimensionless parameters governing the problem. Construction of local solutions close to the boundaries by means of Frobenius expansions discloses the singular behavior and yields the basis for the non-existence proof under limiting conditions. To regularize the problem, the stress tensor must have a term proportional to the dyadic product of the particle concentration gradient with itself.

关键词： FLOW OF SOLIDS

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