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Tsinghua Science and Technology

Issue 1 • Date Feb. 2005

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  • [Front cover]

    Publication Year: 2005, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (138 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2005, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (170 KB)
    Freely Available from IEEE
  • Weakly-singular traction and displacement boundary integral equations and their meshless local petrov-galerkin approaches

    Publication Year: 2005, Page(s):1 - 7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1582 KB)

    The general meshless local Petrov-Galerkin (MLPG) weak forms of the displacement and traction boundary integral equations (BIEs) are presented for solids undergoing small deformations. Using the directly derived non-hyper-singular integral equations for displacement gradients, simple and straightforward derivations of weakly singular traction BIEs for solids undergoing small deformations are also ... View full abstract»

    Open Access
  • Meshless methods coupled with other numerical methods

    Publication Year: 2005, Page(s):8 - 15
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1580 KB)

    Meshless or mesh-free (or shorten as MFree) methods have been proposed and achieved remarkable progress over the past few years. The idea of combining MFree methods with other existing numerical techniques such as the finite element method (FEM) and the boundary element method (BEM), is naturally of great interest in many practical applications. However, the shape functions used in some MFree Free... View full abstract»

    Open Access
  • Analysis of 3-D frictional contact mechanics problems by a boundary element method

    Publication Year: 2005, Page(s):16 - 29
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3537 KB)

    The development of two boundary element algorithms for solving 3-D, frictional, and linear elastostatic contact problems is reported in this paper. The algorithms employ nonconforming discretizations for solving 3-D boundary element models, which provide much needed flexibility in the boundary element modeling for 3-D contact problems. These algorithms are implemented in a new 3-D boundary element... View full abstract»

    Open Access
  • Micromechanics-BEM analysis for piezoelectric composites

    Publication Year: 2005, Page(s):30 - 34
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1006 KB)

    The effective material properties of piezoelectric composites are predicted using micromechanics models of the composite structure combined with a boundary element method (BEM) solution of the governing equation. The composites consist of inclusion and matrix phases. The micromechanics method gives formulae for the overall material constants as functions of the concentration matrix, while the boun... View full abstract»

    Open Access
  • Boundary integral equations and a posteriori error estimates

    Publication Year: 2005, Page(s):35 - 42
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1249 KB)

    Adaptive methods have been rapidly developed and applied in many fields of scientific and engineering computing. Reliable and efficient a posteriori error estimates play key roles for both adaptive finite element and boundary element methods. The aim of this paper is to develop a posteriori error estimates for boundary element methods. The standard a posteriori error estimates for boundary element... View full abstract»

    Open Access
  • Multi-variable non-singular BEM for 2-D potential problems

    Publication Year: 2005, Page(s):43 - 50
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1327 KB)

    A multi-variable non-singular boundary element method (MNBEM) is presented for 2-D potential problems. This method is based on the coincident collocation of non-singular boundary integral equations (BIEs) of the potential and its derivatives, where the nodal potential derivatives are considered independent of the nodal potential and flux. The system equation is solved to determine the unknown boun... View full abstract»

    Open Access
  • Mathematical programming solution for the frictional contact multipole BEM

    Publication Year: 2005, Page(s):51 - 56
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1506 KB)

    This paper presents a new mathematical model for the highly nonlinear problem of frictional contact. A programming model, multipole boundary element method (BEM), was developed for 3-D elastic contact with friction to replace the Monte Carlo method. A numerical example shows that the optimization programming model for the point-to-surface contact with friction and the fast optimization generalized... View full abstract»

    Open Access
  • Multipole BEM for 3-D elasto-plastic contact with friction

    Publication Year: 2005, Page(s):57 - 60
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1098 KB)

    The analysis of 3-D elasto-plastic contact with friction is a highly nonlinear problem. The elements in the contact and plastic zones should be refined to obtain accurate information about the real size, displacement, and traction in the contact zone. However, the increase in the number of degrees of freedom is limited when traditional boundary element method (BEM) is used with the larger memory s... View full abstract»

    Open Access
  • Meshless least-squares method for solving the steady-state heat conduction equation

    Publication Year: 2005, Page(s):61 - 66
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1104 KB)

    The meshless weighted least-squares (MWLS) method is a pure mesh less method that combines the moving least-squares approximation scheme and least-square discretization. Previous studies of the MWLS method for elastostatics and wave propagation problems have shown that the MWLS method possesses several advantages, such as high accuracy, high convergence rate, good stability, and high computational... View full abstract»

    Open Access
  • Fast multipole BEM for 3-D elastostatic problems with applications for thin structures

    Publication Year: 2005, Page(s):67 - 75
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1818 KB)

    The fast multipole method (FMM) has been used to reduce the computing operations and memory requirements in large numerical analysis problems. In this paper, the FMM based on Taylor expansions is combined with the boundary element method (BEM) for three-dimensional elastostatic problems to solve thin plate and shell structures. The fast multipole boundary element method (FM-BEM) requires O(N) oper... View full abstract»

    Open Access
  • Fast multipole BEM for simulation of 2-D solids containing large numbers of cracks

    Publication Year: 2005, Page(s):76 - 81
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1670 KB)

    The fast multipole method was used to solve the traction boundary integral equation for 2-D crack analysis. The use of both multipole and local expansions reduces both the computational complexity and the memory requirement to O(N). The multipole expansion uses a complex Taylor series expansion to reduce the number of multipole moments. The generalized minimum residual method solver (GMRES) was se... View full abstract»

    Open Access
  • Adaptive contour model for real-time foreground detection

    Publication Year: 2005, Page(s):82 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3765 KB)

    A multiscale foreground detection method was developed to segment moving objects from a stationary background. The algorithm is based on a fixed-mesh-based contour model, which starts at the bounding box of the difference map between an input image and its background and ends at a final contour. An adaptive algorithm was developed to calculate an appropriate energy threshold to control the contour... View full abstract»

    Open Access
  • Cooperative localization and tracking in distributed robot-sensor networks

    Publication Year: 2005, Page(s):91 - 101
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3082 KB)

    This paper addresses the problem of real-time position and orientation estimation of networked mobile robots in two-dimensional Euclidean space with simultaneous tracking of a rigid unknown object based on exteroceptive sensory information extracted from distributed vision systems. The sufficient and necessary conditions for team localization are proposed. A localization and object tracking approa... View full abstract»

    Open Access
  • Supply chain coordination with sales effort effects and impact of loss aversion on effort decision

    Publication Year: 2005, Page(s):102 - 107
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1225 KB)

    A new supply contract based on sharing the sales profits as well as the cost of effort was developed to coordinate the supply chain with sales effort effects. The contract coordinates the supplier's actions with voluntary compliance; the contract is symmetric in the sense that both the supplier's and retailer's profits are linearly correlated and is more easily implemented in some situations. The ... View full abstract»

    Open Access
  • Building a portable file system for heterogeneous clusters

    Publication Year: 2005, Page(s):108 - 114
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1746 KB)

    Existing in-kernel distributed file systems cannot cope with the higher requirements in wellequipped cluster environments, especially when the system becomes larger and inevitably heterogeneous. TH-CluFS is a cluster file system designed for large heterogeneous systems. TH-CluFS is implemented completely in the user space by emulating the network file system (N FS) V2 server, and is easily portabl... View full abstract»

    Open Access
  • Design and implementation of a fibre channel target driver supporting SCSI

    Publication Year: 2005, Page(s):115 - 121
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1362 KB)

    Fibre channel storage area networks (FC-SAN) are effective solutions to address storage management problems caused by very large volumes of data. But the expense of fibre channel devices limits FC-SAN applications. The use of IP networks instead of fibre channel networks will reduce SAN cost, but will also reduce the performance. Therefore, small computer system interface (SCSI) devices were consi... View full abstract»

    Open Access
  • Design and implementation of a storage virtualization system based on SCSI target simulator in SAN

    Publication Year: 2005, Page(s):122 - 127
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1290 KB)

    The ideal storage virtualization system is compatible with all operating systems in storage area networks (SANs). However, current storage systems on clustered hosts and multiple operating systems are not practical. This paper presents a storage virtualization system based on a SCSI target simulator in a SAN to solve these problems. This storage virtualization system runs in the target hosts of th... View full abstract»

    Open Access
  • Improved ternary subdivision interpolation scheme

    Publication Year: 2005, Page(s):128 - 132
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1122 KB)

    An improved ternary subdivision interpolation scheme was developed for computer graphics applications that can manipulate open control polygons unlike the previous ternary scheme, with the resulting curve proved to be still C2-continuous. Parameterizations of the limit curve near the two endpoints are given with expressions for the boundary derivatives. The split joint problem is handle... View full abstract»

    Open Access

Aims & Scope

Tsinghua Science and Technology (Tsinghua Sci Technol) aims to highlight scientific achievements in computer science, electronic engineering, and other IT fields. Contributions all over the world are welcome.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Professor Jiaguang Sun
School of Software
Tsinghua University
Beijing  100084 China
journal@tsinghua.edu.cn
Phone:86-10-62771385