English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 59568/92818 (64%)
造访人次 : 816154      在线人数 : 24
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻

    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/60938

    题名: Time Domain Inverse Scattering of a Two-Dimensional Homogenous Dielectric Object with Arbitrary Shape by Particle Swarm Optimization
    作者: Sun, C. H.;Chiu, C. C.;Li, C. L.;Huang, C. H.
    贡献者: 淡江大學電機工程學系
    关键词: Aerospace applications;Cubic boron nitride;Cylinders (shapes);Describing functions;Dielectric devices;Dielectric materials;Finite difference method;Finite difference time domain method;Fourier series;Function evaluation;Gaussian distribution;Gaussian noise (electronic);Global optimization;Inverse problems;Numerical analysis;Numerical methods;Optimization;Particle swarm optimization (PSO);Permittivity;Repair;Restoration;Scattering;Time domain analysis;Trellis codes;Two dimensional;Arbitrary shapes;Computational approach;Cubic splines;Dielectric constants;Dielectric cylinders;Dielectric objects;Finite difference time domain (FDTD) methods;Free spaces;gaussian noise;Global searching;In order;Initial guesses;Inverse scattering problems;Inverse-scattering;numerica l results;Optimization approach (OOA);Parameter spaces;Particle swarm optimization (PSO);Scattered fields;shape functions;Subgridding technique;Time domain (OCT);Trigonometric series;Two-dimensional (2D);Shape optimization
    日期: 2008
    上传时间: 2013-08-08 14:52:16 (UTC+8)
    出版者: Cambridge: Electromagnetics Academy
    摘要: This paper presents a computational approach to the two-dimensional time domain inverse scattering problem of a dielectric cylinder based on the finite difference time domain (FDTD) method and the particle swarm optimization (PSO) to determine the shape, location and permittivity of a dielectric cylinder. A pulse is incident upon a homogeneous dielectric cylinder with unknown shape and dielectric constant in free space andthe scattered fieldis recorded outside. By using the scattered field, the shape and permittivity of the dielectric cylinder are reconstructed. The subgridding technique is implemented in the FDTD code for modeling the shape of the cylinder more closely. In order to describe an unknown cylinder with arbitrary shape more effectively, the shape function is expandedb y closedcubicspline function insteadof frequently used trigonometric series. The inverse problem is resolved by an optimization approach, and the global searching scheme PSO is then employedto search the parameter space. Numerical results demonstrate that, even when the initial guess is far away from the exact one, good reconstruction can be obtained. In addition, the effects of Gaussian noise on the reconstruction results are investigated. Numerical results show that even the measured scattered E fields are contaminated with some Gaussian noise, PSO can still yield good reconstructed quality.
    關聯: Progress in Electromagnetics Research 82, pp.381-400
    DOI: 10.2528/PIER08031904
    显示于类别:[電機工程學系暨研究所] 期刊論文


    档案 大小格式浏览次数
    1070-4698_82p381-400.pdf259KbAdobe PDF187检视/开启



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈