The Experts below are selected from a list of 22374 Experts worldwide ranked by ideXlab platform

Tsuneki Yamasaki - One of the best experts on this subject based on the ideXlab platform.

Mei Song Tong - One of the best experts on this subject based on the ideXlab platform.

  • Accurate electromagnetic analysis for multilayered interconnect structures based on VSIEs
    2017 IEEE International Symposium on Antennas and Propagation & USNC URSI National Radio Science Meeting, 2017
    Co-Authors: Guo Chun Wan, Yu Jie Zhang, Mei Song Tong
    Abstract:

    Electromagnetic analysis for multilayered interconnect structures is carried out by integral equation approach in which volume-surface integral equations (VSIEs) are used. The conducting interconnects are described with surface integral equations (SIEs) whereas the dielectric substrates are governed by volume integral equations (VIEs). The VSIEs are usually solved by the Method of moments (MoM) with the basis functions requiring conforming meshes. We propose a novel scheme to discretize the VSIEs by combining the traditional MoM for the SIEs and a Point-Matching Method for the VIEs. The VSIEs can improve the conditioning of system matrix and the Point-Matching Method can remove the restraint of conforming meshes. A typical numerical example is used to demonstrate the approach and good result has been obtained.

  • A Point-Matching Method for solving volume integral equations with inhomogeneous media
    2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
    Co-Authors: Jieping Zhang, Zhanshan Wang, G. Sun, Jia Zhou, Mei Song Tong
    Abstract:

    Volume integral equations (VIEs) are usually solved by the Method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function. The SWG basis function requires conformal meshes in geometric discretization and may be inconvenient for inhomogeneous problems. In this work, we propose a Point-Matching Method for solving the VIEs without using any basis function. The Method can allow an inhomogeneity of materials in each tetrahedron and may greatly facilitate the meshing of geometries. A numerical example for electromagnetic scattering by a multilayered dielectric object is presented to demonstrate the effectiveness of the Method.

  • On the Point-Matching Method for solving electromagnetic radiation problems
    2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
    Co-Authors: Y. Q. Zhang, Guo Chun Wan, Kuo Yang, Mei Song Tong
    Abstract:

    Point-Matching Methods like boundary element Method (BEM) or Nystrom Method have been widely applied to solve electromagnetic problems. The merits of such Methods include simple mechanism of implementation, removal of basis and testing functions, and low requirement on mesh quality due to the permission of nonconforming meshes. However, the Methods are primarily used to solve scattering problems so far and they are seldom employed for radiation problems yet. The main concern for radiation problems is how to apply an excitation. Unlike the Method of moments with the Rao-Wilton-Glisson (RWG) basis function in which a delta-gap source can be applied over a common edge of RWG triangle, we cannot do so in the Point-Matching Methods. In this work, we use the combined field integral equation (CFIE) as a governing equation and investigate the approach of applying an excitation in the Point-Matching Methods. It is found that using a magnetic frill source as an excitation is a good solution as demonstrated by a typical numerical example.

Mingquan Zhou - One of the best experts on this subject based on the ideXlab platform.

  • An Automatic Dense Point Registration Method for 3D Face Animation
    2009 2nd International Congress on Image and Signal Processing, 2009
    Co-Authors: Mingquan Zhou
    Abstract:

    In this paper, we present an automatic Point match- ing Method to overcome the dense Point alignment of scanned 3D faces. The thin plate spline (TPS) transformation is adopted to model the deformation of 3D faces, and to get fully automatic Point Matching Method, a random Point selecting Method is proposed to get the controlling Points for TPS transformation. Integrating this Point generating Method with an iterative closest Point searching strategy, we achieve dense Point alignment of 3D faces. 3D face animation is created by interpolation between the aligned 3D faces. The realistic 3D face animation results and the acceptable Matching accuracy comparing with the Point- handplaced Method reveal that the proposed Point Matching Method is efficient for dense Point registration with non-rigid deformation.

  • ICCSA Workshops - An Automatic Non-rigid Point Matching Method for Dense 3D Face Scans
    2009 International Conference on Computational Science and Its Applications, 2009
    Co-Authors: Mingquan Zhou
    Abstract:

    In this paper, we present an automatic Point Matching Method to overcome the dense Point alignment of 3D face scans. We adopt TPS (thin plate spline) transformation to model the deformation of different 3D faces, because TPS is a type of non-rigid transformation with good smooth property and suitable for formulating the complexities of human facial morphology. Generally, TPS is derived from the interpolation between two sets of aligned controlling Points. To obtain fully automatic Point Matching Method, a random Point selecting Method is proposed to get the controlling Points of 3D faces. Integrating the Point generating Method with an iterative closest Point searching strategy, we achieve a Point-to-Point alignment solution for dense 3D face scans. The Point Matching tests on BJUT 3D face database reveal that the TPS based Method has flexible shape deformation ability. Comparing with the hand-selecting controlling Point Method our Method has better Point Matching accuracy and stability. It is proved that the presented Method is efficient for dense Point registration with non-rigid deformation.

  • A dense Point-to-Point alignment Method for realistic 3D face morphing and animation
    International Journal of Computer Games Technology, 2009
    Co-Authors: Mingquan Zhou
    Abstract:

    We present a new Point Matching Method to overcome the dense Point-to-Point alignment of scanned 3D faces. Instead of using the rigid spatial transformation in the traditional iterative closest Point (ICP) algorithm, we adopt the thin plate spline (TPS) transformation to model the deformation of different 3D faces. Because TPS is a non-rigid transformation with good smooth property, it is suitable for formulating the complex variety of human facial morphology. A closest Point searching algorithm is proposed to keep one-to-one mapping, and to get good efficiency the Point Matching Method is accelerated by a KD-tree Method. Having constructed the dense Point-to-Point correspondence of 3D faces, we create 3D face morphing and animation by key-frames interpolation and obtain realistic results. Comparing with ICP algorithm and the optical flow Method, the presented Point Matching Method can achieve good Matching accuracy and stability. The experiment results have shown that our Method is efficient for dense Point objects registration.

O. Haeberle - One of the best experts on this subject based on the ideXlab platform.

  • The improved Point Matching Method for triangular metal gratings
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2001
    Co-Authors: F. Scarlat, M. Facina, C.d. Dinca, V. Manu, A. Karabarbounis, J. Papadakis, E. Stiliaris, Ch. Trikalinos, O. Haeberle
    Abstract:

    International audienceIn this paper, we present the "Point Matching Method" (PMM) adapted for the calculation of Smith-Purcell (SP) radiation parameters in H-polarization, generated by relativistic electron beams (REB) passing close to a triangular metal grating. A truncated expression Hdy,n(N;β,ω) was used in order to find the coefficients Hdy,n(β,ω) in the infinite Rayleigh expansion of the diffracted field of a moving electron. A linear system of 2N+1 equations was solved, increasing the number N of harmonics until convergence solutions were achieved. When N→∞ then and the diffracted field can be calculated. SP radiation factors were calculated using the modified PMM for electron energies in 1-30 MeV domain and metal gratings with period length in 1-10 mm range

  • The improved Point Matching Method for triangular metal gratings
    Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2000
    Co-Authors: F. Scarlat, M. Facina, C.d. Dinca, V. Manu, A. Karabarbounis, J. Papadakis, E. Stiliaris, Ch. Trikalinos, O. Haeberle
    Abstract:

    Abstract In this paper, we present the “Point Matching Method” (PMM) adapted for the calculation of Smith–Purcell (SP) radiation parameters in H-polarization, generated by relativistic electron beams (REB) passing close to a triangular metal grating. A truncated expression Hdy,n(N;β,ω) was used in order to find the coefficients Hdy,n(β,ω) in the infinite Rayleigh expansion of the diffracted field of a moving electron. A linear system of 2N+1 equations was solved, increasing the number N of harmonics until convergence solutions were achieved. When N→∞ then lim N→∞ H d y,n (N;β,ω)=H d y,n (β,ω) and the diffracted field can be calculated. SP radiation factors were calculated using the modified PMM for electron energies in 1–30 MeV domain and metal gratings with period length in 1–10 mm range.

Takashi Hinata - One of the best experts on this subject based on the ideXlab platform.