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11TH ANNUAL INTERNATIONAL PHOENIX CONF ON computerS AND COMMUNICATIONS ( IPCCC-92 )

作者： OOKI, M FUKAGAWA, Y MURAKAMI, S YOSHIDA, S Dept. of Electrical Engineering Nishinippon Institute of Technology Fukuoka 800-03 Japan Dept. of Electrical Engineering Kyushu Institute of Technology Fukuoka 804 Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka 820 Japan

ISBN: (纸本)0780306058

The authors present an approximate analysis of an asymmetric token ring network with nonpreemptive priority under a new discipline named the go-back-to-higher-priority discipline. This discipline is described and the token ring network is analysed on the basis of the independent hypothesis for the distribution of the cycle time. Then, probabilities for the number of messages at the token's arrival, a mean cycle time, a mean intervisit time of the token and a mean waiting time of messages for each priority level are obtained. To calculate the mean waiting time for a lower priority level, a root of the denominator of the generating function plays an important role. In some numerical examples with simulation results, the mean waiting time for the go-back-to-higher-priority discipline is compared with that for an asymmetric token ring network with nonpreemptive priority under a one-limited discipline. © 1992 IEEE.

关键词： Internet protocols

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DIELECTRIC STUDY AT MICROWAVE-FREQUENCIES OF WATER-TREATED CROSS-LINKED POLYETHYLENE

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IEEE TRANSACTIONS ON ELECTRICAL INSULATION 1992年第6期27卷 1083-1088页

作者： SUZUKI, T WALRATH, KE ZAHN, M MELCHER, JR Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Dept. of Electr. Eng. MIT Cambridge MA USA

The dielectric properties of water-treed crosslinked polyethylene (XLPE) were studied by using a hollow microwave wave-guide system between 135 MHz and 13.6 GHz. The dielectric loss of water-treed XLPE is proportional to water content. Water-treed XLPE has a low relaxation frequency which is probably due to bound water. The binding of water in trees was confirmed by the lower apparent water diffusion rate in treed XLPE than in undamaged controls measured with a radioactive tracer method.

关键词： dielectric losses dielectric measurement electric breakdown of solids microwave measurement organic insulating materials polymers water 135 MHz to 13.6 GHz XLPE binding water bound water dielectric loss dielectric properties hollow microwave waveguide system microwave frequencies relaxation frequency water content water-treed crosslinked polyethylene Dielectric measurements Hollow waveguides Microwave frequencies Microwave measurements Moisture measurement Optical films Optical waveguides Polyethylene Testing Trees - insulation

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Robust two-parameter invariant CFAR detection utilizing order statistics applied to Weibull clutter

Robust two-parameter invariant CFAR detection utilizing orde...

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Signal and Data Processing of Small Targets 1992

作者： Nagle, Daniel T. Saniie, Jafar Weapons Systems Technology and Assessment Dept. Naval Undersea Warfare Center Division NewportRI02841 United States Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL60616 United States

Constant False Alarm Rate (CFAR) detectors are designed to perform when the clutter information is partially unknown and/or varying. This is accomplished using local threshold estimates from background observations in which the CFAR level is maintained. However, when local observations contain target or irrelevant information, censoring is warranted to improve detection performance. Order Statistics (OS) processors have been shown to perform robustly (referring to type II errors or CFAR loss) for heterogeneous background clutter observations, and their performance has been analyzed for exponential clutter with unknown power. In this paper, several order statistics are used to create an invariant test statistic for Weibull clutter with two varying parameters (i.e., power and skewness). The robustness of a two-parameter invariant CFAR detector is analyzed and compared with an uncensored Weibull-Two Parameter (WTP) CFAR detector and conventional Cell Averaging (CA)-CFAR detector (i.e., designed invariant to exponential clutter). The performance trade-offs of these detectors are gaged for different scenarios of volatile clutter environments. © 1992 Proceedings of SPIE - The International Society for Optical Engineering. All rights reserved.

关键词： Clutter (information theory)

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Methods for fast image object recognition in robotics

Methods for fast image object recognition in robotics

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1992 IEEE International Workshop on Emerging Technologies and Factory Automation, ETFA 1992

作者： Harvey, Alan L. Cohen, Harvey A. Department of Electrical and Manufacturing Systems Engineering Royal Melbourne Institute of Technology GPO Box 2476V MelbourneVIC3001 Australia Computer Sciece and Computer Engineering Dept. La Trobe University BundooraVIC3083 Australia

ISBN: (纸本)0780308867

In Vision guided robotic operations, the rapid location and identification of image objects for assembly is essential. The image object data taken with a ccd camera may be in the form of a grey level, binary or colour image. This paper discusses our work on new speed up methods for object recognition in binary and grey level images. These are a coarse/fine stepping method and a sparse template technique. An extension of the coarse fine technique to give larger speedups is discussed. © 1992 IEEE.

关键词： Object recognition

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NEURAL-NET BASED ROBOT VISUO-MOTOR COORDINATION VIA 3D PERCEPTION

NEURAL-NET BASED ROBOT VISUO-MOTOR COORDINATION VIA 3D PERCE...

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1992 IEEE International Conference on systems, Man, and Cybernetics

作者： LEE, S SHIMOJI, S PARK, J Jet Propulsion Laboratory California Institute of Technology Pasadena 91109 CA United States Computer Science Dept. Univ. of Southern California L.A. 90089-0781 CA United States Dept. of EE-Systems Univ. of Southern California L.A. 90089-0781 CA United States

ISBN: (纸本)0780307208

This paper presents a new neural net approach to robot visuo-motor coordination. The approach, referred to here as "neurobotics", establishes neural net-based visual error servoing as a fundamental mechanism of implementing visuo-motor coordination. Visual error servoing is achieved by projecting the robot task space on the 3D perception net (representing the robot internal 3D space) and generating an incremental change of 3D space arm configuration in the 3D perception net based on potential field-based reactive path planning. The 3D space arm configuration planned in the 3D perception net is then translated into the corresponding joint angles through the arm kinematic net. The arm kinematic net is formed based on radial-based competitive and cooperative network. Simulation results are shown. © 1992 IEEE.

关键词： Neural networks

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A blackboard, activity-based control architecture for a mobile platform

A blackboard, activity-based control architecture for a mobi...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Liscano, R. Fayek, R.E. Karam, G.M. Autonomous Systems Laboratory Institute for Information Technology National Research Council OttawaONK1A OR6 Canada Dept. of Systems and Computer Engineering Carleton University OttawaONK1S 5B6 Canada

ISBN: (纸本)0780307372

This paper presents a system architecture for autonomous navigation for a mobile platform designed on the view of activities. A control unit that acts upon information posted on a blackboard supervises these activities. Each activity is composed of several sensing modules connected to one or more perception modules, which are, in turn, connected to an appropriate action module so that the platform can perform a defined functionality. The control unit inter. acting with the blackboard decides what activity should be active at any given time, based on information provided by the perception modules. Interaction between activities is minimal or none, and, therefore, it is possible to design and debug each activity independently. Information detected by the perception modules is posted on the blackboard to be processed by the control unit. This control unit has the option to alter the parameters of the current activity, or to deactivate its action module so that another activity can be enabled. It acts as a high level reasoning agent, while the activities can perform the desired functionalities of the vehicle in real time. This architecture supports the use of multiple sensors;they are treated as modules that can easily be connected to the,perception modules. This leads to an activity-based system structure which is highly flexible and adaptive. Defining the activities in this control architecture is much easier than defining levels of abstraction in a hierarchical structure and less error-prone than describing layers in a behavior-based controller. © 1992 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Drilling platforms

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TrActorS: A transactional actor system for distributed query processing 12

TrActorS: A transactional actor system for distributed query...

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12th International Conference on Distributed Computing systems, ICDCS 1992

作者： Haghjoo, Mostafa S. Papazoglou, Mike P. Dept. of Computer Science Australian National University GPO Box 4 CanberraACT2601 Australia School of Information Systems Queensland University of Technology GPO Box 2434 BrisbaneQLD4001 Australia

ISBN: (纸本)0818628650

A transaction management model for distributed information systems that utilizes actor-like objects (TrActor) which deviate from conventional actors in their objects types, messages types, and mail queue is described. The objects are used in conjunction with distributed blackboarding techniques for addressing the process of reasoning about the need for cooperation and negotiation between the disparate information sources in a distributed information network. A variant of the nested transaction model is proposed as an information processing framework for the management model. A language for this framework is also proposed, and the feasibility of this approach is demonstrated by means of a comprehensive example. © 1992 IEEE.

关键词： Tractors (truck)

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Manipulabilities of Serial-parallel Manipulator systems

Manipulabilities of Serial-parallel Manipulator Systems

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Lee, Sukhan Kim, Sungbok Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States Dept. of EE-Systems and Computer Science University of Southern California Los AngelesCA90089-0781 United States

ISBN: (纸本)0780307372

This paper presents two different approaches of defining the manipulabilities and resistivities of serial-parallel manipulator systems. In the first approach, the manipulability [resistivity] of the serialparallel structure is dehed by imposing the kinematic constraint on the local manipulabilities [local resistivities], each of which is obtained from the unit sphere in the joint velocity [joint torque] space of an individual arm. In the second approach, the manipulability [resistivity] of the serial-parallel structure is defined by imposing the kinematic constraint directly on the unit sphere in the extended joint space formed by all the arms. The two approaches are shown to be complementary to each other: the fist approach is useful for the geometrical analysis of the interactions among local arms, while the latter is useful for the quantitative analysis of the performance of a serial-parallel structure as a whole. © 1992 IEEE.

关键词： Kinematics

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Modeling, Design and Evaluation for Advanced Teleoperator Control systems

Modeling, Design and Evaluation for Advanced Teleoperator Co...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Lee, S. Lee, H.S. Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States Dept. of EE-Systems and Computer Science University of Southern California Los AngelesCA90089-0781 United States

ISBN: (纸本)0780307372

In this paper, we propose the concept of "telemonitoring" as a means of coordinating between human operator and manipulator under the shared control and the use of "human in the control loop" to achieve a valid design of a teleoperator control system. Especially, this paper shows that 1) In designing and controlling teleoperation system under time delay, it is necessary to incorporate a human dynamic behavior into the control loop. 2) Under the compliance and force control implemented at the remote manipulator in the form of shared control, the conventional kinesthetic coupling between man and manipulators based on telepresence incurs an adverse effect on performance. 3) Under the communication time delay, the proposed force feedback based on telemonitoring enhances system stability as well as performance significantly. Simulation results are given. © 1992 IEEE.

关键词： Manipulators

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A SURVEY ON THE PARALLEL DISTRIBUTED PROCESSING OF PRODUCTION systems

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International Journal on Artificial Intelligence Tools 1992年第2期1卷 279-331页

作者： ANDREW SOHN JEAN-LUC GAUDIOT Dept. of Computer and Information Science New Jersey Institute of Technology Newark NJ 07102 U.S.A. Dept. of Electrical Engineering-Systems University of Southern California Los Angeles CA 90089-2563 U.S.A.

The importance of production systems in artificial intelligence (AI) has been repeatedly demonstrated by a large number of expert systems. As the number and size of expert systems grow, there has however been an emerging obstacle in such AI applications: the large processing time. The need for faster execution of production systems has spurred research in both the software and hardware domains, including connectionist architectures. This paper surveys various aspects of parallel distributed processing of production systems. Approaches taken to date to solve the problems associated with production systems are classified here into three levels: the algorithmic level, the parallel implementation level, and the connectionist level. Several pattern matchers and multiple rule firing principles are presented to demonstrate the algorithm level improvement. Several parallel implementation efforts are surveyed along with experimental results on real machines or with simulators. The presentation of three different types of connectionist production systems (local, distributed, and hierarchical representation) completes this survey. Finally, we explore some potential avenues towards the implementation of a true asynchronous parallel production system.

关键词： production systems expert systems connectionist production systems parallel processing

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