检索结果-内蒙古大学图书馆

DOMAIN DECOMPOSITION WITH NON-MATCHING GRIDS FOR COUPLING OF FEM AND NATURAL BEM

Journal of Systems Science & Complexity 2005年第4期18卷 529-542页

作者： YANG Ju'e HU Qiya YU Dehao LSEC Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

In this paper, we introduce a domain decomposition method with non-matching grids for solving Dirichlet exterior boundary problems by coupling of finite element method （FEM） and natural boundary element method（BEM）. We first derive the optimal energy error estimate of the nonconforming approximation generated by this method. Then we apply a Dirichlet-Neumann（D-N） alternating algorithm to solve the coupled discrete system. It will be shown that such iterative method possesses the optimal convergence. The numerical experiments testify our theoretical results.

关键词： Domain decomposition non-matching grids natural boundary reduction multiplier space error estimate D-N alternating algorithm convergence.

来源：评论

学校读者我要写书评

暂无评论

A new class of memory gradient methods with inexact line searches

引用

Journal of Numerical mathematics 2005年第1期13卷 53-71页

作者： Shi, Z.-J. College of Operations Research and Management Qufu Normal University Rizhao Shandong 276826 China Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

The paper presents a new class of memory gradient methods with inexact line searches for unconstrained minimization problems. The methods use more previous iterative information than other methods to generate a search direction and use inexact line searches to select a step-size at each iteration. It is proved that the new methods have global convergence under weak mild conditions. The convergence rate of these methods is also investigated under some special cases. Some numerical experiments show that these new algorithms converge more stably than other line search methods and are effective in solving large scale unconstrained minimization problems. © VSP 2005.

关键词： Problem solving

来源：评论

学校读者我要写书评

暂无评论

A Discrete Scheme of Laplace-Beltrami Operator and Its Convergence over Quadrilateral Meshes

A Discrete Scheme of Laplace-Beltrami Operator and Its Conve...

引用

第二届全国几何设计与计算学术会议

作者： Dan Liu Guoliang Xu State Key Laboratory of Scientific and Engineering Computing Institute of Computational MathematicsAcademy of Mathematics and System SciencesChinese Academy of Sciences

Laplace-Beltrami operator and its discretization play a central role in several applications in the fields of computer graphics and computer aided geometric *** this paper,a discrete scheme for Laplace-Beltrami operator over quadrilateral meshes is constructed based on a bilinear interpolation of the quadrilateral. Convergence results for the proposed discrete scheme are established under some conditions.

关键词： Laplace-Beltrami Operator Quadrilateral meshes Discretization Convergence

来源：评论

学校读者我要写书评

暂无评论

Surface modelling using fourth order geometric flows

Surface modelling using fourth order geometric flows

引用

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

来源：评论

学校读者我要写书评

暂无评论

Japanese computational grid research project: NAREGI

Japanese computational grid research project: NAREGI

引用

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

来源：评论

学校读者我要写书评

暂无评论

From Line Search Method to Trust Region Method

From Line Search Method to Trust Region Method

引用

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.

来源：评论

学校读者我要写书评

暂无评论

ICDAR2005 page segmentation competition

ICDAR2005 page segmentation competition

引用

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

来源：评论

学校读者我要写书评

暂无评论

Methods for wave equation prestack depth migration and numerical experiments

引用

Science China mathematics 2004年第z1期47卷 111-120页

作者： ZHANG Guanquan ZHANG Wensheng Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper the methods of wave theory based prestack depth migration and their implementation are studied. Using the splitting of wave operator, the wavefield extrapolation equations are deduced and the numerical schemes are presented. The numerical tests for SEG/EAEG model with MPI are performed on the PC-cluster. The numerical results show that the methods of single-shot (common-shot) migration and synthesized-shot migration are of practical values and can be applied to field data processing of 3D prestack depth migration.

关键词： wave operator splitting, 3D prestack depth migration, SEG/EAEG model, synthesized-shot, finite-difference method, factorization method, hybrid method, MPI.

来源：评论

学校读者我要写书评

暂无评论

A non-conforming domain decomposition for Raviart-Thomas vector fields in three dimensions

引用

Science China mathematics 2004年第z1期47卷 190-199页

作者： HU Qiya Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper we are concerned with a domain decomposition method with nonmatching grids for Raviart-Thomas finite elements. In this method, the normal complement of the resulting approximation is not continuous across the interface. To handle such non-conformity, a new matching condition will be introduced. Such matching condition still results in a symmetric and positive definite stiffness matrix. It will be shown that the approximate solution generated by the domain decomposition possesses the optimal energy error estimate.

关键词： domain decomposition, nonmatching grids, Raviart-Thomas finite elements, matching condition, error estimate.

来源：评论

学校读者我要写书评

暂无评论

Lie Point Symmetries of Differential-Difference Equations

引用

Communications in Theoretical Physics 2004年第5期41卷 645-648页

作者： DING Wei~1 TANG Xiao-Yan~(2,3) 1 Department of Applied mathematics,Shanghai Jiao Tong University,Shanghai 200030,China2 Department of Physics,Shanghai Jiao Tong University,Shanghai 200030,China3 State Key Laboratory of scientific and engineering computing,institute of computational mathematics and scientific engineering computing,Academy of mathematics and System Sciences,the Chinese Academy of Sciences,P.O.Box 2719,Beijing 100080,China State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences the Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

In this paper,the classical Lie group approach is extended to find some Lie point symmetries of differential-difference *** reveals that the obtained Lie point symmetries can constitute a Kac-Moody-Virasoro algebra.

关键词： Lie point symmetry differential-difference equation Kac Moody-Virasoro algebra

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：