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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/101676

    Title: 結合直交表與隨機搜尋法於逆散射問題的應用研究
    Other Titles: Investigation of orthogonal array combined with random search method in the application of the inverse scattering problem
    Authors: 翁黃偉;Wong, Huang-Wei
    Contributors: 淡江大學電機工程學系碩士班
    李慶烈;Li, Ching-Lieh
    Keywords: 直交表;動差法;平滑變化機制;非同步粒子群聚法;Orthogonal Array;Method of Moments;Smooth variation;Synchronous Particle Swarm Optimization
    Date: 2014
    Issue Date: 2015-05-01 16:13:58 (UTC+8)
    Abstract: 本論文研究存在於自由空間中二維金屬導體的頻域電磁逆散射問題。在正散射的分析部分,本研究以動差法(Method of Moments, MoM)為基礎,至於逆散射則被轉換為最佳化問題以進行求解,吾人使用非同步粒子群聚法(APSO)、非同步粒子群聚法結合平滑變化機制(APSO+Smoothvary)以及非同步粒子群聚法結合直交表和平滑變化機制(OA+APSO+Smoothvary)所求的解做比較。  
    This thesis studies the electromagnetic inverse scattering problem in frequency domain for a two-dimensional inhomogeneous dielectric cylinder located in free space. The analysis of forward scattering part is based on the Method of Moments (MoM) , while the inverse scattering part is tackled by transforming the problem into an optimization one, of which the asynchronous particle swarm optimization(APSO) is chosen. The reconstructed results by APSO are compared with those obtained by APSO plus certain kind of smooth variation for the control parameter and/or associated with the orthogonal array (OA).

    At first, the convergence speed and results for nine benchmarked functions (with dimension 10) are tested as the control parameters are varied for the algorithm of APSO. It is found that not only the best values of the control parameters are different for each function, but also the best success rates are. Nevertheless, we do find one set of the learning factor, c1=2.8 and c2=1, that is suitable for all benchmarked functions tested in general. Then the introduction of certain kind of smooth variation for the control parameters is tested during the course of searching procedure. It is found that the mechanism of smooth variation for the control parameters can increase the success rate significantly in addition to the convergence depth.
    Finally, since the orthogonal array exhibits the characteristic of uniform appearance for each level of the experimental parameters, it do reveal its superiority as combined and applied for the inverse scattering problem. For examples, the initial best particle, convergence depth and reconstructed results can be significant improved. It is concluded that for the inverse scattering problem of a two-dimensional metallic conductor, the inclusion of orthogonal array and the mechanism of smooth variation of the control parameters is a helpful technique.
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Thesis

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