論文 - 武居 周
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交互方向節点ブロックを用いた乗法Schwarz前処理による高周波電磁界解析の高速化 査読あり
村山敏夫，武居周，吉村忍
電子情報通信学会論文誌 C J93-C ( 12 ) 647 - 656 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Full wave analyses of electromagnetic fields with an iterative domain decomposition method 査読あり
Takei A., Sugimoto S., Ogino M., Yoshimura S., Kanayama H.
IEEE Transactions on Magnetics 46 ( 8 ) 2860 - 2863 2010年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE Transactions on Magnetics
This paper describes large-scale full wave analyses of electromagnetic fields by the finite-element method with an iterative domain decomposition method (IDDM). A stationary vector wave equation for the high-frequency electromagnetic field analyses is solved taking an electric field as an unknown function. Then, to solve subdomain problems by the direct method, the direct method based on the LDL T decomposition method is introduced in subdomains. If the direct method is applied for solving subdomain problems, the computation time seems to be reduced by the improved accuracy of subdomain problems, and storing matrices that are results of the decomposition on main memory. © 2006 IEEE.
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階層型領域分割法において部分領域に直接法を適用した高周波電磁場の大規模解析 査読あり
武居周, 杉本振一郎, 荻野正雄, 吉村忍, 金山寛
電気学会論文誌A 130-A ( 3 ) 647 - 656 2010年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Full Wave Analyses of Electromagnetic Fields with an Iterative Domain Decomposition Methods 査読あり
A.Takei, S.Sugimoto, M.Ogino, S.Yoshimura, and H.Kanayama
Proceedings of Compumag2009, Florianopolis, Brazil, Nov. 22-26, 2009, CD-ROM/ PB3.13. 2009年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Large-scale full wave analysis of electromagnetic field by hierarchical domain decomposition method 査読あり
Takei A., Yoshimura S., Kanayama H.
CMES - Computer Modeling in Engineering and Sciences 40 ( 1 ) 63 - 81 2009年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：CMES - Computer Modeling in Engineering and Sciences
This paper describes a large-scale finite element analysis (FEA) for a high-frequency electromagnetic field of Maxwell equations including the displace- ment current. A stationary Helmholtz equation for the high-frequency electromag- netic field analysis is solved by considering an electric field and an electric scalar potential as unknown functions. To speed up the analysis, the hierarchical domain decomposition method (HDDM) is employed as a parallel solver. In this study, the Parent-Only type (Parallel processor mode: P-mode) of the HDDM is employed. In the P-mode, Parent processors perform the entire FEA. In this mode, all CPUs can be used without idling in an environment of 10-20 CPUs. A whole body cavity res- onator (TEAM Workshop problem 29) and a real-world commuter train model with 12.8 million degrees-of-freedom are solved to verify accuracy and performance of the developed method. Copyright © 2009 Tech Science Press.
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電車内環境中の高周波電磁場の大規模並列有限要素解析 査読あり
武居周，吉村忍，金山寛
日本シミュレーション学会論文誌 1 ( 1 ) 1 - 10 2009年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Takei A., Sugimoto S., Kawai H., Yoshimura S.
Asia Simulation Conference 2009, JSST 2009 2009年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Asia Simulation Conference 2009, JSST 2009
Visualization of a huge scale electromagnetic field analysis, with tens of mil lions of degrees of freedom, can be performed efficiently by reusing the hierarchical domain-decomposition data structure, which has been prepared originally for parallel processing of the simulation. Based on this data structure and the associated memory-efficient element search algorithm, a vector arrow plot on an arbitrary cut section can be rendered interactively on a workstation or a PC.
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Takei A., Yoshimura S., Kanayama H.
CMES - Computer Modeling in Engineering and Sciences 31 ( 1 ) 13 - 23 2008年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：CMES - Computer Modeling in Engineering and Sciences
This paper presents large-scale finite element analyses of high frequency electromagnetic fields in commuter trains. The ADVENTURE_Magnetic is one of the main modules of the ADVENTURE system, which is an open source parallel finite element analyses system, and is able to solve eddy current and magnetostatic problems using the hierarchical domain decomposition method (HDDM) with an iterative linear algebraic solver. In this paper, we improve the module so as to solve a high frequency electromagnetic field of 500-1000 M[Hz]. A stationary Helmholtz equation for electromagnetic wave problems is solved taking an electric field as an unknown function. In this study, stable convergence is achieved by adding a stability term. Basic performance of the module is first investigated by solving a simple model. Then a part of a commuter train with seats, handrails and two human bodies is precisely modeled into a large-scale finite element mesh with Nedelec elements of about 5.2 million degrees of freedom (DOFs). The results prove that the improved module can predict precisely the distribution of the electromagnetic field produced by mobile phones inside commuter trains.
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階層型領域分割法による高周波電磁場の大規模解析 査読あり
武居 周, 吉村 忍, 金山 寛
電気学会論文誌A 128-A ( 9 ) 591 - 597 2008年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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最小ノルム法による電場源推定逆解析 査読あり
武居周、吉村忍
シミュレーション 2005年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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電界源探査に関する逆解析 査読あり
武居周, 早野誠治, 斎藤兆古
電気学会論文誌A 121-A ( 2 ) 99 - 105 2001年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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A weighted inverse matrix approach to searching for the electric field sources 査読あり
Takei A., Hayano S., Saito Y.
IEEE Transactions on Magnetics 36 ( 4 PART 1 ) 1027 - 1030 2000年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE Transactions on Magnetics
In this paper, we propose an approach to solving for an inverse problem. We try to evaluate a unique solution of an inverse problem by means of the weighted inverse matrix. We have applied our weighted inverse matrix method to searching for the electric field source and Demonstrating the three dimensional electric field distributions. As a result, we have succeeded in evaluating the unique electric field source and in visualizing the three dimensional electric vector field distributions from the locally measured electric fields. © 2000 IEEE.
DOI： 10.1109/20.877616
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A Weighted Inverse Matrix Approach to Searching for the Electric Field Sources 査読あり
A.Takei, S.Hayano, and Y.Saito
Compumag99, Sapporo, Japan, Oct. 25-28, 1999 1999年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）