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International Conference on Computer Graphics, Imaging and Visualization, CGIV

作者： Guoliang Xu Qing Pan State Key Lab of Scientific and Engineering Computing Institute of Computational Mathematics Academy of Mathematics and System Science Chinese Academy and Sciences China

We use two fourth order geometric partial differential equations to efficiently solve several surface modelling problems, including the surface blending, the N-sided hole filling and the free-form surface fitting with the G/sup 1/ boundary continuity. The nonlinear equations used include the surface diffusion flow and the Willmore flow. These nonlinear equations are discretized using the mixed finite element method based on the combination of the loop's basis and the linear basis. The proposed approach is simple, efficient and gives very desirable results.

关键词： computational geometry Finite element methods Nonlinear equations Partial differential equations Surface fitting

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The TeraGyroid experiment - Supercomputing 2003

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Scientific Programming 2005年第1期13卷 1-17页

作者： Blake, R.J. Coveney, P.V. Clarke, P. Pickles, S.M. Computational Science and Engineering Department CCLRC Daresbury Laboratory Warrington WA4 4AD United Kingdom Centre for Computational Science Christopher Ingold Laboratories University College London 20 Gordon Street London WC1H 0AJ United Kingdom Department of Physics and Astronomy University College London Gower Street London WC1E 6BT United Kingdom National e-Science Centre e-Science Institute 15 South College Street Edinburgh EH8 9AA United Kingdom Manchester Computing University of Manchester Oxford Road Manchester M13 9PL United Kingdom

Amphiphiles are molecules with hydrophobic tails and hydrophilic heads. When dispersed in solvents, they self assemble into complex mesophases including the beautiful cubic gyroid phase. The goal of the TeraGyroid experiment was to study defect pathways and dynamics in these gyroids. The UK's supercomputing and USA's TeraGrid facilities were coupled together, through a dedicated high-speed network, into a single computational Grid for research work that peaked around the Supercomputing 2003 conference. The gyroids were modeled using lattice Boltzmann methods with parameter spaces explored using many 1283and 2563grid point simulations, this data being used to inform the world's largest three-dimensional time dependent simulation with 10243-grid points. The experiment generated some 2 TBytes of useful data. In terms of Grid technology the project demonstrated the migration of simulations (using Globus middleware) to and fro across the Atlantic exploiting the availability of resources. Integration of the systems accelerated the time to insight. Distributed visualisation of the output datasets enabled the parameter space of the interactions within the complex fluid to be explored from a number of sites, informed by discourse over the Access Grid. The project was sponsored by EPSRC (UK) and NSF (USA) with trans-Atlantic optical bandwidth provided by British Telecommunications. © 2005 - IOS Press and the authors. All rights reserved.

关键词： Technical presentations

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From Line Search Method to Trust Region Method

From Line Search Method to Trust Region Method

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第五届运筹学及其应用国际研讨会

作者： Zhen-Jun Shi Xiang-Sun Zhang College of Operations Research and Management Qufu Normal University Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science CAS Institute of Applied Mathematics Academy of Mathematics and Systems Science CAS

Line search method and trust region method are two important classes of techniques for solving optimization problems and have their advantages respectively. In this paper we use the Armijo line search rule in a more accurate way and propose a new line search method for unconstrained optimization problems. Global convergence and convergence rate of the new method are analyzed under mild conditions. Furthermore, the new Armijo-type line search strategy is shown to be equivalent to an approximation of a trust region method then has both advantages of line search strategy and trust region strategy.

关键词： unconstrained optimization line search method global convergence convergence rate.

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An efficient technique for optimization of the concentric array radial line slot antenna (CA-RLSA)

An efficient technique for optimization of the concentric ar...

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Antennas and Propagation Society International Symposium

作者： Zhuo Feng Le-Wei Li Er-Ping Li Tat Soon Yeo Department of Electrical and Computer Engineering National University of Singapore Kent Ridge Singapore Computational Electronics and Electromagnetics Division Institute of High Performance Computing Science Park II Singapore

Presents an improved technique for the design of CA-RLSAs in which the slot paths are split into several identical regions. The conventional Galerkin's moment method is carried out to solve the unknown excitation ... 详细信息

ISBN: (纸本)0780388836

关键词： Antenna arrays Slot antennas Moment methods Apertures Transmission line matrix methods Admittance Magnetic analysis Magnetic fields Equations Electromagnetics

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Japanese computational grid research project: NAREGI

Japanese computational grid research project: NAREGI

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作者： Matsuoka, Satoshi Shimojo, Sinji Aoyagi, Mutsumi Sekiguchi, Satoshi Usami, Hitohide Miura, Kenichi Global Scientific Information and Computing Center Tokyo Institute of Technology Tokyo 152-8550 Japan NAREGI Project National Institute of Informatics Tokyo 101-0051 Japan Cybermedia Center Osaka University Osaka 567-0047 Japan Computing and Communications Center Kyushu University Fukuoka 812-8581 Japan Tsukuba 305-8568 Japan Computational Science And Engineering Center Fujitsu Ltd. Chiba 261-8588 Japan Tokyo 101-0051 Japan Fujitsu Laboratory Kanagawa 211-8588 Japan

The National Research Grid Initiative (NAREGI) is one of the major Japanese national IT projects currently being conducted. NAREGI will cover the period 2003-2007, and collaboration among industry, academia, and the government will play a key role in its success. The Center for Grid Research and Development has been established as a center for R&D of high-performance, scalable grid middleware technologies, which are aimed at enabling major computing centers to host grids over high-speed networks to provide a future computational infrastructure for scientific and engineering research in the 21st century. As an example of utilizing such grid computing technologies, the Center for Application Research and Development is conducting research on leading-edge, grid-enabled nanoscience and nanotechnology simulation applications, which will lead to the discovery and development of new materials and next-generation nanodevices. These two centers are collaborating to establish daily research use of a multiteraflop grid testbed infrastructure, which will be built to demonstrate the advantages of grid technologies for future applications in all areas of science and engineering. © 2005 IEEE.

关键词： Computation theory

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On using type-1 fuzzy set mathematics to derive interval type-2 fuzzy logic systems

On using type-1 fuzzy set mathematics to derive interval typ...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： J.M. Mendel R.I. John Feilong Liu Signal and Image Processing Institute Department of Electrical Engineering University of Southern California Los Angeles CA USA Centre for Computational Intelligence Department of Computer Science Faculty of Computing Science and Engineering De Montfort University Leicester UK

In this paper, we demonstrate that it is unnecessary to take the route from general type-2 fuzzy set to interval type-2 fuzzy set, and that all of the results that are needed to implement an interval type-2 fuzzy logic system can be obtained using type-1 fuzzy set mathematics. As such, this paper makes an interval type-2 fuzzy logic system much more accessible to the fuzzy logic community, and we can now develop an interval type-2 fuzzy logic system in a much more straightforward way.

关键词： Fuzzy logic Fuzzy sets Fuzzy systems Mathematics Frequency selective surfaces Signal processing Image processing computational intelligence Computer science Uncertainty

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ICDAR2005 page segmentation competition

ICDAR2005 page segmentation competition

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International Conference on Document Analysis and Recognition

作者： A. Antonacopoulos B. Gatos D. Bridson Pattern Recognition and Image Analysis (PRImA) Research Laboratory School of Computing Science and Engineering University of Sanford Manchester UK Computational Intelligence Laboratory National Center for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece

There is an established need for objective evaluation of layout analysis methods, in realistic circumstances. This paper describes the page segmentation competition (modus operandi, dataset and evaluation criteria) held in the context of ICDAR2005 and presents the results of the evaluation of four candidate methods. The main objective of the competition was to compare the performance of such methods using scanned documents from commonly-occurring publications. The results indicate that although methods seem to be maturing, there is still a considerable need to develop robust methods that deal with everyday documents.

关键词： Image analysis Performance analysis Image segmentation Text analysis Optical character recognition software Pattern recognition Telecommunication computing computational intelligence Laboratories Informatics

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Image-based 3D face modeling system

Image-based 3D face modeling system

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作者： Park, In Kyu Zhang, Hui Vezhnevets, Vladimir School of Information and Communication Engineering Inha University 253 Younghyun-dong Nam-gu Incheon 402-751 Korea Republic of Computing Lab Samsung Advanced Institute of Technology San 14-1 Nongseo-ri Giheung-eup Yongin 449-712 Korea Republic of Graphics and Media Lab Department of Computational Mathematics and Cybernetics Moscow State University Moscow 119899 Russia School of Information and Communication Engineering Inha University Korea Republic of IEEE IEEE Computer Society ACM Samsung Advanced Institute of Technology Yongin Korea Republic of Graphics and Media Lab Computer Science Department Moscow State University

This paper describes an automatic system for 3D face modeling using frontal and profile images taken by an ordinary digital camera. The system consists of four subsystems including frontal feature detection, profile feature detection, shape deformation, and texture generation modules. The frontal and profile feature detection modules automatically extract the facial parts such as the eye, nose, mouth, and ear. The shape deformation module utilizes the detected features to deform the generic head mesh model such that the deformed model coincides with the detected features. A texture is created by combining the facial textures augmented from the input images and the synthesized texture and mapped onto the deformed generic head model. This paper provides a practical system for 3D face modeling, which is highly automated by aggregating, customizing, and optimizing a bunch of individual computer vision algorithms. The experimental results show a highly automated process of modeling, which is sufficiently robust to various imaging conditions. The whole model creation including all the optional manual corrections takes only 2-3 minutes. © 2005 Hindawi Publishing Corporation.

关键词： Computer simulation

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3D prestack depth migration with planewave synthesizing method

3D prestack depth migration with planewave synthesizing meth...

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2004 Society of Exploration Geophysicists Annual Meeting, SEG 2004

作者： Zhang, Wensheng Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and Systems Science CAS Beijing100080 China

3D prestack depth migration is essential for imaging complex structures. And shot-profile 3D prestack depth migration is one of the commonly used methods. In this paper, the 3D prestack depth migration for the SEG/EAEG model with the planewave synthesizing method is presented. Based on the difference operator splitting method, wavefield extrapolation by hybrid methods is implemented with two schemes, one is the two-way splitting algorithm, the other is the four-way splitting algorithm. Numerical results for the SEG/EAEG model with MPI parallel algorithm are given. The migration results show that the 3D prestack depth migration with the planewave synthesizing method has good imaging precision and that the numerical anisotropic errors are not obvious when wavefield extrapolation is completed with the two-way splitting hybrid algorithm. The method presented in this paper can be applied in field data processing. © 2004 SEG Annual Meeting. All rights reserved.

关键词： Numerical methods

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An Exponential Matrix Product Based Representation for Generalized Hypergeometric Functions of TypepFp

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Applied Numerical Analysis & computational Mathematics 2005年第1期2卷

作者： N. A. Baykara İrem Yaman Metin Demiralp Mathematics Department Faculty of Sciences and Letters Marmara University Göztepe 34722 İstanbul Turkey Group for Science and Methods of Computing Computational Science and Engineering Program Informatics Institute İstanbul Technical University Maslak 34469 İstanbul Turkey Phone: +90 212 285 70 77 Fax: +90 212 285 70 73 Phone: +90 212 285 70 82 Fax: +90 212 285 70 73

In this work, a new representation is developed for generalized hypergeometric functions of type p F p . To this end a first order vector differential equation is constructed in a way such that the derivative of the unknown vector has unit matrix coefficient. The solution vector differential equation is rewritten in the form of a series expansion. An infinite process of factor extractions and annihilations is employed to construct finally a vector differential equation that can be easily solved. Truncation of this scheme can be used to get approximations to hypergeometric functions of type p F p . A simple, yet meaningful, implementation seems to give quite promising results. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： Exponential matrix factorization generalized hypergemetric function

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