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A transaction assessment method for allocation of transmission services - Reply

IEEE TRANSACTIONS ON POWER SYSTEMS 1999年第3期14卷 928-928页

作者： Baran, ME Banunarayanan, V Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA Skaale Energy Control Center Carolina Power and Light Company Raleigh NC USA

Provides information on a study which presented a powerflow based method for an accurate assessment of the impact of a electric transaction on an area/utility. Overview of the transaction assessment method; Descriptio... 详细信息

关键词： Reactive power Power generation Pricing Power system analysis computing Power system economics System testing Costs Power systems Power engineering computing Power generation economics

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Genetic algorithms solution for unconstrained optimal crane control

Genetic algorithms solution for unconstrained optimal crane ...

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1999 Congress on Evolutionary Computation, CEC 1999

作者： Kimiaghalam, Bahram Homaifar, Abdollah Bikdash, Marwan Dozier, Gerry NASA-Autonomous Control Engineering Center Department of Electrical Engineering NC AandT State University Greensboro NC United States Department of Computer Science and Engineering Auburn University AL 36849-5347 United States

ISBN: (纸本)0780355369

Crane control is a difficult problem for conventional control methods because of the highly nonlinear equations that must be satisfied. Usually the necessary conditions for solving an optimal control problem require finding the initial co-state vector. In this paper real-coded genetic algorithms are used to find the desired initial value of the costates of the system with no constraints. In our genetic representation, each chromosome represents a set of co-states and each gene (co-state) has an associated cost based on its ability to move the system to desired state after a given amount of time. The objective is to evolve a minimum cost co-state. Our results for this unconstrained crane problem are quite encouraging. © 1999 IEEE.

关键词： Genetic algorithms

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Robust control of multivariable systems using statistical confidence bounds

Robust control of multivariable systems using statistical co...

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IEEE Conference on Decision and control

作者： L. Wang Center for Integrated Dynamics and Control Department of Electrical and Computer Engineering University of Newcastle Callaghan NSW Australia

It is well known that traditional algorithms from the system identification field produce, not only a nominal model, but also a quantification of the quality of the model via statistical confidence bounds. However, traditional robust control design methods often do not match well this type of description of modelling errors. This paper extends a recently developed procedure for dealing with statistical confidence bounds in robust control to multivariable systems. The solutions are obtained in the spirit of model matching via a state-space approach. A design example is introduced to demonstrate the efficacy of the method.

关键词： Robust control MIMO Uncertainty System identification control systems System performance State-space methods Open loop systems Estimation error Australia

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Representations for recognition under variable Illumination

Representations for recognition under variable Illumination

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International Workshop on Shape, Contour and Grouping in computer Vision

作者： Kriegman, David J. Belhumeur, Peter N. Georghiades, Athinodoros S. Beckman Institute Department of Computer Science University of Illinois at Urbana-Champaign 405 N. Mathews Avenue UrbanaIL61801 United States Center for Computational Vision and Control Department of Electrical Engineering Yale University New HavenCT06520-8267 United States

ISBN: (纸本)3540667229

Due to illumination variability, the same object can appear dramatically different even when viewed in fixed pose. Consequently, an object recognition system must employ a representation that is either invariant to, or models this variability. This chapter presents an appearance-based method for modeling this variability. In particular, we prove that the set of n-pixel monochrome images of a convex object with a Lambertian reflectance function, illuminated by an arbitrary number of point light sources at infinity, forms a convex polyhedral cone in IRn and that the dimension of this illumination cone equals the number of distinct surface normals. For a non-convex object with a more general reflectance function, the set of images is also a convex cone. Geometric properties of these cones for monochrome and color cameras are considered. Here, present a method for constructing a cone representation from a small number of images when the surface is continuous, possibly non-convex, and Lambertian;this accounts for both attached and cast shadows. For a collection of objects, each object is represented by a cone, and recognition is performed through nearest neighbor classification by measuring the minimal distance of an image to each cone. We demonstrate the utility of this approach to the problem of face recognition (a class of non-convex and non-Lambertian objects with similar geometry). The method is tested on a database of 660 images of 10 faces, and the results exceed those of popular existing methods. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Cones

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Chattering-free sliding mode control with unmodeled dynamics

Chattering-free sliding mode control with unmodeled dynamics

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American control Conference (ACC)

作者： D. Krupp Y.B. Shtessel Guidance and Control Division NASA Marshall Space Flight Center AL USA Department of Electrical and Computer Engineering University of Alabama Huntsville AL USA

Sliding mode control systems are valued for their robust accommodation of uncertainties and their ability to reject disturbances. In this paper, a design methodology is proposed to eliminate the chattering phenomenon affecting sliding mode controlled plants with input unmodeled actuator dynamics of second order or greater. The proposed controller design is based on the relative degrees of the plant and the unmodeled actuator dynamics and ranges of the uncertainties of the plant and actuator. The controller utilizes the pass filter characteristics of the physical actuating device to provide a smoothing effect on the discontinuous control signal rather than introducing any artificial dynamics into the controller design thus eliminating chattering in the system's output response.

关键词： Sliding mode control Actuators control systems Uncertainty Robust control Design methodology Dynamic range Filters Smoothing methods Signal design

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A hamiltonian approach to the eikonal equation 2nd

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2nd International Workshop on Energy Minimization Methods in computer Vision and Pattern Recognition, EMMCVPR 1999

作者： Siddiqi, Kaleem Tannenbaum, Allen Zucker, Steven W. School of Computer Science and Center for Intelligent Machines McGill University McGill University 3480 University Street MontréalPQH3A 2A7 Canada Department of Electrical and Computer Engineering University of Minnesota University of Minnesota 200 Union Street S. E MinneapolisMN55455 United States Department of Computer Science and Center for Computational Vision and Control Yale University Yale University New HavenCT06520-8285 United States

ISBN: (纸本)3540662944

The eikonal equation and variants of it are of significant interest for problems in computer vision and image processing. It is the basis for continuous versions of mathematical morphology, stereo, shapefrom-shading and for recent dynamic theories of shape. Its numerical simulation can be delicate, owing to the formation of singularities in the evolving front, and is typically based on level set methods introduced by Osher and Sethian. However, there are more classical approaches rooted in Hamiltonian physics, which have received little consideration in the computer vision literature. Here the front is interpreted as minimizing a particular action functional. In this context, we introduce a new algorithm for simulating the eikonal equation, which offers a number of computational advantages over the earlier methods. In particular, the locus of shocks is computed in a robust and efficient manner. We illustrate the approach with several numerical examples. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Mathematical morphology

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Robust and non-fragile H/sub /spl infin// control of parameter uncertainties time-varying delay systems

Robust and non-fragile H/sub /spl infin// control of paramet...

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SICE Annual Conference

作者： Jong Hae Kim Sang Kyung Lee Hong Bae Park Sensor Technology Research Center Kyungpook National University Taegu South Korea Department of Computer Applied Control Doowon Technical College Ansung South Korea School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea

This paper describes the synthesis of robust and non-fragile H/sup /spl infin// state feedback controllers for linear systems with time delay and parameter uncertainties, and static state feedback controller with multiplicative uncertainty. The sufficient condition of controller existence, the design method of robust and non-fragile H/sup /spl infin// state feedback controller, and the measure of non-fragility in controller are presented. Also, using some changes of variables and Schur complements, the obtained sufficient condition can be rewritten as an linear matrix inequality form in terms of transformed variables. Therefore, the obtained robust and non-fragile H/sup /spl infin// controller guarantees the asymptotic stability and disturbance attenuation of the closed loop system in spite of controller gain variations within a degree.

关键词： Robustness Robust control State feedback control system synthesis Linear feedback control systems Sufficient conditions control systems Linear systems Delay effects Uncertain systems

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Robust controller design for RTP system using structured uncertainty approach

Robust controller design for RTP system using structured unc...

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SICE Annual Conference

作者： Sang Kyung Lee Jong Hae Kim Do Chang Oh Hong Bae Park Department of Computer Applied Control Doowon Technical College Ansung South Korea Sensor Technology Research Center Kyungpook National University Taegu South Korea Department of Information Electronics and Communication Engineering Konyang University South Korea School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea

In this paper, we propose an robust controller design of rapid thermal processing (RTP) system using the structured uncertainty approach. Using the weighted mixed sensitivity function, we solve the robust stability problem against disturbance and temperature variation, and design a /spl mu/ controller using the curve fitting method against structured uncertainty. Finally, the simulation results are proposed to show the validity of the proposed method.

关键词： Robust control control systems Uncertainty Temperature control Robust stability Thermal stresses Communication system control Temperature sensors Ovens Semiconductor device modeling

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Observer-based fuzzy H/sup /spl infin// control for uncertain nonlinear systems with time delays

Observer-based fuzzy H/sup /spl infin// control for uncertai...

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American control Conference (ACC)

作者： Kap Rai Lee Jong Hae Kim Eun Tae Jeung Han O Yun Hong Bae Park Department of Computer Applied Control Doowon Technical College Ansung Gyeonggi South Korea Sensor Technology Research Center Kyungpook National University Taegu South Korea Department of Control and Instrument Engineering Changwon NatE28099l University Kyungnam South Korea Department of Electronics Kumi College Kumi Gyeongbuk South Korea School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea

ISBN: (纸本)0780349903

This paper presents the problem of observer-based fuzzy H/sup /spl infin// control for a class of uncertain nonlinear systems with time-varying delayed systems on the basis of Takagi-Sugeno fuzzy model. First, we design a fuzzy observer such that destination error system is globally, exponentially stable. Next, we design a fuzzy H/sup /spl infin// controller such that the closed loop system is globally, exponentially stable and achieves L/sub 2/ gain performance. The fuzzy control systems utilize the concept of the so-called parallel distributed compensation. A sufficient condition for the existence of robust fuzzy H/sup /spl infin// controllers and observers are given in terms of linear matrix inequalities (LMIs). The control gains can also be directly obtained from the LMI solutions.

关键词： Fuzzy control Fuzzy systems Nonlinear control systems Nonlinear systems Time varying systems Delay systems Takagi-Sugeno model control systems Closed loop systems Performance gain

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Bas-relief ambiguity

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International Journal of computer Vision 1999年第1期35卷 33-44页

作者： Belhumeur, Peter N. Kriegman, David J. Yuille, Alan L. Center for Comp. Vision and Control Dept. of Electrical Engineering Yale University New Haven CT 06520 United States Beckman Institute Department of Computer Science Univ. of Illinois Urbana-Champaign Urbana IL 61801 United States Smith-Kettlewell Eye Res. Institute San Francisco CA 94115 United States

When an unknown object with Lambertian reflectance is viewed orthographically, there is an implicit ambiguity in determining its 3-d structure: we show that the object's visible surface f(x, y) is indistinguishable from a `generalized bas-relief' transformation of the object's geometry, f¯(x, y) = λf(x, y)+μx+vy, and a corresponding transformation on the object's albedo. For each image of the object illuminated by an arbitrary number of distant light sources, there exists an identical image of the transformed object illuminated by similarly transformed light sources. This result holds both for the illuminated regions of the object as well as those in cast and attached shadows. Furthermore, neither small motion of the object, nor of the viewer will resolve the ambiguity in determining the flattening (or scaling) λ of the object's surface. Implications of this ambiguity on structure recovery and shape representation are discussed.

关键词： Object recognition

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