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International Conference on Cyberworlds

作者： A. Iglesias F. Luengo Department of Applied Mathematics and Computational Sciences University of Cantabria Spain Department of Computer Science University of Zulia Venezuela

The realistic animation of the behavior of virtual agents emulating human beings and evolving within virtual 3D worlds (a field also known as artificial life) has received great attention during the last few years. The current challenge is to create a behavioral system for the virtual agents so that they behave as realistic as possible. Such a system should provide the agents with the most typical features of human intelligence: perception, recognition, memory, learning, reasoning, etc. Among the large number of different techniques to solve this problem, those based on artificial intelligence (AI) seem to be especially suitable for this purpose. In this paper, we apply several artificial intelligence techniques (such as neural networks, expert systems, fuzzy logic, K-means) to create a sophisticated behavioral system that allows the agents to take intelligent decisions by themselves. The paper describes the behavioral system, its main components and how these AI techniques have been effectively incorporated into the system. In order to show the good performance of our approach, an illustrative example is analyzed.

关键词： Intelligent agent Artificial intelligence Humans Animation Learning Artificial neural networks Expert systems Fuzzy logic Intelligent networks Performance analysis

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Alternating Direction Finite Element Method for a Class of Moving Boundary Problems

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3314卷 44-50页

作者： Liu, Xu-Zheng Cui, Xia Yong, Jun-Hai Sun, Jia-Guang Department of Computer Science and Technology Tsinghua University Beijing 100084 China Laboratory of Computational Physics Institute of Applied Physics Computational Mathematics Beijing 100088 China School of Software Tsinghua University Beijing 100084 China

An alternating direction finite element scheme for a class of moving boundary problems is studied. Using coordinate transformations of the spatial variants, a new domain independent of the time is obtained and an ADFE scheme on the new domain is proposed. Then the unique solvability of the approximation scheme is proved, and optimal H1 and L2 norm space estimates and O((Δt)2) estimate for the temporal variant are obtained. © Springer-Verlag 2004.

关键词： Finite element method

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A POSITIVE INTERIOR-POINT ALGORITHM FOR NONLINEAR COMPLEMENTARITY PROBLEMS

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applied mathematics and Mechanics(English Edition) 2003年第3期24卷 355-362页

作者：马昌凤梁国平陈新美 Department of computational Science and Applied Physics Guilin Institute of Electronic Technology Institute of Mathematics Academy of Mathematics & System SciencesCASBeijing 100080P.R.China Institute of Mathematics Academy of Mathematics & System Sciences Department of Mathematic & Computer Changsha University of Electric Power

A new iterative method,which is called positive interior-point algorithm,is presented for solving the nonlinear complementarity *** method is of the desirable feature of *** the convergence theorems of the algorithm i... 详细信息

关键词： nonlinear complementarity problems positive interior-point algorithm non-smooth equations

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Lowness properties of reals and hyper-immunity

Lowness properties of reals and hyper-immunity

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作者： Bedregal, Benjamín René Callejas Nies, André Department of Informatics and Applied Mathematics Laboratory of Logic and Computational Intelligence Federal University of Rio Grande Do Norte CEP 59.072-970 Natal Brazil Department of Computer Science Centre for Discrete Mathematics and Theoretical Computer Science University of Auckland Private Bag 92019 Auckland New Zealand

Ambos-Spies and Kučera [1, Problem 4.5] asked if there is a non-computable set A which is low for the computably random reals. We show that no such A is of hyper-immune degree. Thus, each g &leT A is dominated by a computable function. Ambos-Spies and Kučera [1, problem 4.8] also asked if every S-low set is S0-low. We give a partial solution to this problem, showing that no S-low set is of hyper-immune degree. © 2003 Published by Elsevier science B.V.

关键词： Computation theory

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Lowness Properties of Reals and Hyper-Immunity

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Electronic Notes in Theoretical computer science 2003年 84卷 73-79页

作者： Benjamín René Callejas Bedregal André Nies Department of Informatics and Applied Mathematics Laboratory of Logic and Computational Intelligence Federal University of Rio Grande do Norte CEP 59.072-970 Natal Brazil Department of Computer Science Centre for Discrete Mathematics and Theoretical Computer Science University of Auckland Private Bag 92019 Auckland New Zealand

Ambos-Spies and Kučera [1, Problem 4.5] asked if there is a non-computable set A which is low for the computably random reals. We show that no such A is of hyper-immune degree. Thus, each g ≤ T A is dominated by a computable function. Ambos-Spies and Kučera [1, problem 4.8] also asked if every S-low set is S 0 -low. We give a partial solution to this problem, showing that no S -low set is of hyper-immune degree.

关键词： Randomness S -lowness hyper-immunity

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Linear least-squares based methods for neural networks learning

Linear least-squares based methods for neural networks learn...

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Joint International Conferences on Artificial Neural Networks and Neural Information Processing, ICANN/ICONIP 2003

作者： Fontenla-Romero, Oscar Erdogmus, Deniz Principe, J.C. Alonso-Betanzos, Amparo Castillo, Enrique Laboratory for Research and Development in Artificial Intelligence Department of Computer Science University of A Coruña Campus de Elviña s/n Coruña15071 A Spain Computational NeuroEngineering Laboratory Electrical and Computer Engineering Department University of Florida GainesvilleFL32611 United States Department of Applied Mathematics and Computational Sciences University of Cantabria University of Castilla-La Mancha Avda de Los Castros s/n Santander39005 Spain

ISBN: (纸本)3540404082

This paper presents two algorithms to aid the supervised learning of feedforward neural networks. Specifically, an initialization and a learning algorithm are presented. The proposed methods are based on the independent optimization of a subnetwork using linear least squares. An advantage of these methods is that the dimensionality of the effective search space for the non-linear algorithm is reduced, and therefore it decreases the number of training epochs which are required to find a good solution. The performance of the proposed methods is illustrated by simulated examples. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Feedforward neural networks

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Direct methods for matrix Sylvester and Lyapunov equations

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Journal of applied mathematics 2003年第6期2003卷 277-303页

作者： Sorensen, Danny C. Zhou, Yunkai Department of Computational and Applied Mathematics Rice University Houston TX 77005-1892 United States Department of Computational and Applied Mathematics Rice University Houston TX 77005-1892 United States Argonne National Laboratory Math and Computer Science Division Argonne IL 60439 United States

We revisit the two standard dense methods for matrix Sylvester and Lyapunov equations: The Bartels-Stewart method for A1X+XA2+D=0 and Hammarling's method for AX+XAT+BBT=0 with A stable. We construct three schemes for solving the unitarily reduced quasitriangular systems. We also construct a new rank-1 updating scheme in Hammarling's method. This new scheme is able to accommodate a B with more columns than rows as well as the usual case of a B with more rows than columns, while Hammarling's original scheme needs to separate these two cases. We compared all of our schemes with the Matlab Sylvester and Lyapunov solver lyap.m;the results show that our schemes are much more efficient. We also compare our schemes with the Lyapunov solver sllyap in the currently possibly the most efficient control library package SLICOT;numerical results show our scheme to be competitive. © 2003 Hindawi Publishing Corporation. All rights reserved.

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computational study of turbulent mixing at the Caltech ASC center

Computational study of turbulent mixing at the Caltech ASC c...

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16th AIAA computational Fluid Dynamics Conference 2003

作者： Hill, D. Mattner, T.W. Pantano, C. Cook, A.W. Dimotakis, P.E. Meiron, D.I. Pullin, D.I. GALCIT Caltech 205-45 Pasadena CA 91125 United States GALCIT Caltech 301-46 Pasadena CA 91125 United States Lawrence Livermore National Laboratory Livermore CA 94550 United States Applied and Computational Mathematics and Computer Science Caltech 256-80 Pasadena CA 91125 United States GALCIT Caltech 105-50 Pasadena CA 91125 United States

ISBN: (纸本)9781624100864

We present an overview of a portion of the compressible turbulence program associated with the ASC-sponsored Center for Simulation of Dynamic Response in Materials. Progress in several areas will be summarized. The first is the development of a hybrid WENO-centered-finite-difference method suitable for the large-eddy simulation (LES) of the strong-shock, Richtmyer-Meshkov (RM) instability in a rectangular tube, with end-wall shock reflection and reshock of the evolving mixing layer. The use of this scheme together with a structure-based SGS model for LES of RM instability will be outlined. Second, results obtained from DNS simulations of nonpremixed turbulent combustion in a three-dimensional jet will be described. These were done with finite-rate chemistry using the four-step reduced mechanism of Peters. The emphasis is on diagnostics relating to statistical analysis of flame geometry and turbulent mixing across the range of scales. Lastly, we present results obtained from DNS of Rayleigh-Taylor instability. They elucidate the physics of the gravity-driven mixing through analysis of PDFs of mole fraction and scalar dissipation, and show the structure of the scalar-dissipation field, amplified through the incorporation and extensions of level-set analysis. © 2003 by the authors.

关键词： Large eddy simulation

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Planar chiral meta-materials: Controlling the polarization state of light in the far- and near-field

Planar chiral meta-materials: Controlling the polarization s...

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2003 Conference on Lasers and Electro-Optics Europe, CLEO/EUROPE 2003

作者： Bagnall, D.M. Papakostas, A. Potts, A. Prosvirnin, S.L. Takahashi, S. Zayats, A.V. Zheludev, N.I. Department of Pure and Applied Physics Queen's University of Bevast Bevast BT7 INN United Kingdom Department of Physics and Astronomy Universiry of Southampton Southampton SO1 7 IBJ United Kingdom Department of Electronics and Computer Science Universiry of Southampton Southampton SO1 7 IBJ United Kingdom Department of Computational Mathematics Institute of Radio Astronomy Kharkiv Ukraine

ISBN: (纸本)0780377346

We have extended our research to the study of near-field polarization effects arising from the planar chirality. The interaction between the neighboring elements in a metallic structure can be visualized with near-field measurements. Coupling between metallic gammadions that gives rise to the scattered electromagnetic field with polarization components different from the polarization state of the incident light can be directly identified. We have also investigated far-field effects in two-dimensional gratings consisting of regular patterns of dielectric gammadions on a silicon substrate. © 2003 IEEE.

关键词： Incident light

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Planar chiral meta-materials: controlling the polarization state of light in the far- and near-field

Planar chiral meta-materials: controlling the polarization s...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： D.M. Bagnall A. Papakostas A. Potts S.L. Prosvirnin S. Takahashi A.V. Zayats N.I. Zheludev Department of Electronics and Computer Science University of Southampton Southampton UK Department of Computational Mathematics Institute of Radio Astronomy Kharkiv Ukraine Department of Pure and Applied Physics The Queen's University of Belfast Belfast UK Department of Physics and Astronomy University of Southampton Southampton UK

关键词： Lighting control Optical polarization Electromagnetic wave polarization Dielectric substrates Visualization Dielectric measurements Electromagnetic measurements Electromagnetic coupling Optical coupling Electromagnetic scattering

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