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Great Lakes Symposium on VLSI

作者： S. Srinivas A. Basu A. Paulraj L.M. Patnaik Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Centre for Development of Advanced Computing Bangalore India Microprocessor Applications Laboratory Supercomputing Education and Research Center Department of Computer Science and Automation Indian Institute of Science Bangalore India

The authors present a parallel algorithm for logic simulation of VLSI circuits. It is implemented on a network of transputers connected in a ring topology. The approach is based on partitioning a functionality matrix representation of the circuit among the transputers and adopting a data flow technique for the solution. A significant aspect of the algorithm is that it overlaps computation with communication, thereby reducing the communication overhead. It also attempts even distribution of load in order to reduce processor idle time. The algorithm possesses the advantages of ease of implementation and ease of extension to incorporate additional parameters for simulation. Performance results of the algorithm are given.< >

关键词： Parallel algorithms Circuit simulation Computational modeling Concurrent computing Application software Logic circuits Very large scale integration Algorithm design and analysis Logic design Design automation

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Task planning for flexible manufacturing systems

Task planning for flexible manufacturing systems

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1990 IEEE Colloquium in South America, COLLOQ 1990

作者： Sanderson, Arthur C. IEEE Robotics and Automation Society Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY1218 United States

ISBN: (纸本)0879426101

The design and implementation of flexible manufacturing systems require the planning of task requirements to meet standards of reliability, cost, and throughput over a family of products. Tools for computer-aided engineering of manufacturing systems utilize automated planning and representation methods to enhance the capability of engineers to design better systems. Automated assembly sequence planning methods link product design to assembly system design and provide a basis for such interactive engineering tools. Methods for geometric reasoning, assembly plan representation, and automated assembly sequence selection will be discussed. © 1990 IEEE.

关键词： Flexible manufacturing systems

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Tracking in a complex visual environment 1st

Tracking in a complex visual environment

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1st European Conference on Computer Vision, ECCV 1990

作者： Aloimonos, John Yiannis Tsakiris, Dimitris P. Computer Vision Laboratory Center for Automation Research and Institute for Advanced Computer Studies and Computer Science Department University of Maryland College ParkMD20742-3411 United States Electrical Engineering Department and Systems Research Center University of Maryland College ParkMD20742-3411 United States

ISBN: (纸本)9783540525226

We examine the tracking of 3-dimensional targets moving in a complex (e.g. highly textured) visual environment, which makes the application of methods relying on static segmentation and feature correspondence very problematic, even under specific assumptions about the trajectory of the target. From the system kinematics and optical flow formalism we derive a general criterion, the Tracking Constraint, which specifies the optimal camera reorientation as the one that minimizes the optical flow in the center of the camera in the sense of an appropriate metric. A correspondence-free scheme is devised which employs dynamic segmentation and linear features of the image in order to capture global information about the scene and bypass numerical differentiation of the image intensity. © Springer-Verlag Berlin Heidelberg 1990.

关键词： Optical flows

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Shape from focus: an effective approach for rough surfaces

Shape from focus: an effective approach for rough surfaces

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IEEE International Conference on robotics and automation (ICRA)

作者： S.K. Nayar Y. Nakagawa The Robotics Institute Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Production Engineering Research Laboratory Hitachi and Limited Yokohama Kanagawa Japan

Two algorithms for depth estimation are presented. The first algorithm simply looks for the focus level that maximizes the focus measure at each image point. The second algorithm uses a Gaussian model to interpolate the focus measures to obtain more accurate depth estimates. The algorithms were implemented and tested on surfaces of different roughness and reflectance properties. The results indicate that the shape-from-focus method may be applied to a variety of industrial vision problems.< >

关键词： Shape Rough surfaces Surface roughness Focusing Frequency Image sensors Image analysis Layout Robots Image sequences

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Aperiodicky conditions for polynomials with uncertain coefficient parameters

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International Journal of Control 1990年第5期51卷 1147-1150页

作者： T. MORI H. KOKAME Automation Research Laboratory Kyoto University Gakasko Uji Kyoto 611 Japan Department of Electrical Engineering Osaka Institute of Technology Osaka 535 Ohmiya Asahiku Japan

Aperiodicity is normally defined as a property such that all the roots are simple and negative real, while interval polynomials are referred to as polynomials with coefficients lying within specified closed intervals on the real axis. Several conditions for aperiodicity, including an exact one, are derived. Comments on these conditions are given in contrast to the work of Soh and Berger, who also considered the problem with a modified definition of aperiodicity.

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Cellular neural networks with nonlinear and delay-type template elements

Cellular neural networks with nonlinear and delay-type templ...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： T. Roska L.O. Chua Department of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory University of California Berkeley CA USA Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The cellular neural network (CNN) paradigm is a powerful framework for analog nonlinear processing arrays placed on a regular grid. The authors extend the repertoire of CNN cloning template elements (atoms) by introducing additional nonlinear and delay-type characteristics. With this generalization, several well-known and powerful analog array-computing structures can be interpreted as special cases of the CNN. Moreover, it is shown that the CNN with these generalized cloning templates has a general programmable circuit structure with analog macros and algorithms. The relations with the cellular automaton and the systolic array are analysed. Finally, some robust stability results and the state-space structure of the dynamics are presented.< >

关键词： Cellular neural networks Analog computers Computer networks Grid computing Cloning Robust stability Delay Voltage control Power engineering computing Automata

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A microfabricated three-degree-of-freedom parallel mechanism

A microfabricated three-degree-of-freedom parallel mechanism

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IEEE International Conference on Micro Electro Mechanical Systems

作者： F. Behi M. Mehregany K.J. Gabriel Robotics Research Department Machine Perception Research Department AT and T Bell Laboratories Inc. Holmdel NJ USA Microsystems Technology Laboratories Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Tokyo Japan

A microfabricated, three-degree-of-freedom, passive, closed-chain, planar mechanism with the potential for low-torque precision positioning applications is presented. A parallel-link mechanism design is selected rather than a serial-link implementation, since parallel-link mechanisms can operate with stationary actuators and are more rigid than their serial counterparts. Polysilicon surface micromachining is used to fabricate a mechanism which has a total area of 0.13 mm/sup 2/ and a workspace of approximately 0.01 mm/sup 2/. The fabrication process for the mechanism is described, identifying the effect on device performance of constraints imposed by the microfabrication; most notably joint clearances, component nonplanarity, and residual-stress-induced linkage deformations. The requisite formulations for the kinematics and dynamics of the device are presented which, in conjunction with the documented measurements of friction on structures of similar geometry and material, indicate that the dominant torque loads are due to friction.< >

关键词： Fabrication Micromotors Couplings Kinematics Actuators Friction Silicon Micromachining Torque measurement Appropriate technology

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Detecting simple motion using cellular neural networks

Detecting simple motion using cellular neural networks

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： T. Roska T. Boros P. Thiran L.O. Chua Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory Berkeley Sensor & Actuator Center University of California Berkeley Berkeley CA USA

The general framework of motion detection based on the discrete-time samples of the moving image is defined. Four types of motion detection problem are studied. The simplest one is a model resembling the experiment of D.H. Hubel and T.N. Wiesel (1962) with a cat's retina for detecting the motion of an object having a given speed in a given direction. The most complicated case is the determination of the vertical and horizontal velocity components of a moving image. Various cloning template sequences are proposed for detecting different types of motion. The consecutive black and white image samples are fed to the input and to the initial state nodes of the cellular neural network, respectively. After the transients have decayed, the output gives the information necessary for detecting the presence or absence of a specific motion as well as for estimating the direction and the magnitude of the velocity vector. Conditions are analysed under which the detection is correct. The circuit realization of some motion detectors are discussed and the use of a programmable dual CNN structure is proposed.< >

关键词： Motion detection Cellular neural networks Motion estimation Analog computers Radio access networks Laboratories automation Computational Intelligence Society Cloning Circuits

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EXTENDED EQUAL-AREA CRITERION - AN ANALYTICAL ULTRA-FAST METHOD FOR TRANSIENT STABILITY ASSESSMENT AND PREVENTIVE CONTROL OF POWER-SYSTEMS

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INTERNATIONAL JOURNAL OF electrical POWER & ENERGY SYSTEMS 1989年第2期11卷 131-149页

作者： XUE, Y PAVELLA, M Nanjing Automation Research Institute Nanjing China Department of Electrical Engineering University of Liège Liège Belgium

A unified approach to transient stability assessment of multimachine power systems is presented. It originates from the equal-area criterion applied to a two-machine equivalent of the system, combined with an analytical procedure totally free from any step-by-step numerical integration. The extended equal-area criterion thus devised provides analytical tools for transient stability analysis and sensitivity assessment. In turn, the latter furnishes transient stability limits and paves the way to control. Means to embed these transient stability techniques in a unified security assessment context are developed. Applications to system planning, operation planning and real-time operation are investigated and many practical uses are suggested. The method is scrutinized by a systematic exploration of 10 different power systems and many contingency scenarios, resulting in over 2500 simulations.

关键词： analytical sensitivity analysis direct method preventive control second-swing instability stability domain transient stability assessment transmission limits

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Extended equal area criterion justifications, generalizations, applications

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IEEE Power engineering Review 1989年第2期9卷 38-39页

作者： Xue, Y. Van Cutsem, Th Ribbens-Pavella, M. Nanjing Automation Research Institute Nanjing China Department of Electrical Engineering University of Liége Sart-Tilman B-4000 Liége Belgium F.N.R.S France

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