論文 - 武居 周
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Study of node arrangement in numerical human body analysis based on SPFD method 査読あり
Y. Nakamura, M. Nomura, H. Tarao, A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：筆頭著者, 責任著者 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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Development of Microwave analysis code: ADVENTURE_Fullwave 査読あり
T. Mizuma, A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：責任著者 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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High-accuracy Analysis of Full-wave Electromagnetic Field with parallel mesh smoothing 査読あり
A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：筆頭著者, 責任著者 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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Direct Method for Parallel Eddy Current Analyses with High Order Edge Element 査読あり
T. Mizuma and A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：責任著者 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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High-performance Finite Element for Large-scale Acoustic Analysis 査読あり
E. Takaoka and A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：責任著者 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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Performance evaluation of the parallel multi-grid method and various linear solvers for large-scale current density analysis inside a human body 査読あり
M. Nomura, Y. Nakamura, H. Tarao and A. Takei
Proceedings of The 38th JSST Annual Conference: International Conference on Simulation Technology, Miyazaki, Japan, Nov. 5-7, 2019 , USB 2019年11月
担当区分：責任著者 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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特異値分解を部分領域ソルバに用いた渦電流解析 査読あり
水間健仁, 武居周
電気学会論文誌B 139 ( 11 ) 650 - 655 2019年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Large-scale numerical human body analysis using parallel geometric multi-grid method 査読あり
M. Nomura, H. Tarao, A. Takei
Proceedings of Compumag 2019, Paris, France, July 15-19, 2019, USB 2019年7月
担当区分：責任著者 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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Performance Evaluation of Parallel Finite Element Eddy-Current Analysis Using Direct Method as Subdomain Solver 査読あり
Mizuma and A. Takei
Proceedings of Compumag 2019, Paris, France, July 15-19, 2019, USB 2019年7月
担当区分：責任著者 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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Microwave analysis based on parallel finite element method 査読あり
A. Takei, I. Higashi, M. Aikawa and T. Yamada
Journal of Advanced Simulation in Science and Engineering 6 ( 1 ) 215 - 233 2019年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Performance evaluation of preconditioning method for in-body current density analysis using numerical human model 査読あり
M. Nomura, H. Tarao, N. Hayashi, A. Takei
Journal of Advanced Simulation in Science and Engineering 5 ( 2 ) 29 - 47 2019年3月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Murakami Y., Yamamoto K., Takei A.
Advances in Intelligent Systems and Computing 744 206 - 214 2019年
記述言語：日本語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Advances in Intelligent Systems and Computing
© 2019, Springer Nature Singapore Pte Ltd. Recently, acoustic analysis techniques are used in the design of acoustic environments both inside and outside of rooms containing a sound source. However, when the analysis area is expanded or the frequency is increased, unknowns of a solving liner equation increase, and large-scale analyses becomes necessary. Therefore, in this study, a large-scale acoustic analysis method has been developed based on a parallel finite element method. In the proposed large-scale analysis method, an iterative method is applied to the interface problem as the iterative domain decomposition method, which is known to be an effective parallelization method. To improve the convergence of the iterative method, balancing domain decomposition has been applied as a preconditioner step, and its effectiveness in large-scale acoustic analysis is demonstrated. The acoustic analysis code is developed in this study that is shown to be capable of the large-scale analysis of finite element models on the order of tens of millions of elements with high accuracy.
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Improved convergence in eddy-current analysis by singular value decomposition of subdomain problem 査読あり
Mizuma T., Takei A.
Advances in Intelligent Systems and Computing 744 199 - 205 2019年
記述言語：日本語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Advances in Intelligent Systems and Computing
The purpose of this study is to improve the convergence of the iterative domain decomposition method for the Interface Problem in time-harmonic eddy-current analysis. The solver applied is the A - ϕ method, which consists of the magnetic vector potential A and an unknown function of the electric scalar potential ϕ. However, it is known that the convergence of the iterative domain decomposition method deteriorates for the interface problem in analyses with large-scale numerical models. In addition, the equation obtained by the A - ϕ method is a singular linear equations. In general, iterative methods are applied to solve this equation, however it is difficult to achieve high-precision because of the truncation error. In this research, to solve this problem, a direct method using a generalized inverse matrix based on a singular value decomposition method is introduced to solve the subdomain problems. Although this increases the computational cost, high-precision arithmetic becomes possible. Here, we investigate the improvement in the convergence of the interface problem by comparing our proposed method with previous method, when applied to the standard eddy-current problem.
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Analysis of Current Density Inside Human Body Using Geometric Multi-Grid Method 査読あり
M. Nomura, H. Tarao, A. Takei
IEEE Transaction on Magnetics 2019年
記述言語：英語 掲載種別：研究論文（学術雑誌）
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村上 裕哉, 山本 広太, 工藤 彰洋, 武居 周
日本シミュレーション学会論文誌 10 ( 4 ) 89 - 98 2019年
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Hidden surface removal for interaction between hand and virtual objects in augmented reality 査読あり
Ishizu T., Sakamoto M., Hori M., Shinoda T., Toyota T., Takei A., Ito T.
Advances in Science, Technology and Engineering Systems 4 ( 4 ) 359 - 365 2019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：Advances in Science, Technology and Engineering Systems
© 2019 ASTES Publishers. All rights reserved. Recently, augmented reality (AR) technology has been applied to the interaction technology between human and virtual objects. In AR interaction technology, it is necessary for users to be able to manipulate virtual objects intuitively. Thus, we focus on manipulating virtual objects directly with the user’s bare hands in this study. On the other hand, in AR technology, since the 3-dimensional (3D) model is superimposed on the image of the real space afterwards, it is always displayed on the front side than the user’s hand (occlusion problem). Thus, it becomes an unnatural scene in some cases. In this study, this system detects hand area of the user by extracting depth information, color information and using canny edge detection in the user’s hand. Thus, this system performs hidden surface removal along the area of the user’s hand by considering the object-context relations between the user’s hand and the virtual object. In the evaluation experiment, it is confirmed that the hidden surface removal in this study make it possible to distinguish between finger boundaries and to clarify and process finger contours. This work is an extension of the paper entitled “Hidden Surface Processing for Interaction of Hand and Virtual Objects Using Leap Motion Controller” published in 2018 International Conference on Information and Communication Technology Robotics (ICT-ROBOT).
DOI： 10.25046/aj040444
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Projection Mapping: Interactive Operation using Kinect 査読あり
M. Sakamoto, T. Ishizu, M. Hori, A. Takei, T. Ito
International Journal of Recent Technology and Engineering 8 ( 4 ) 2019年
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Research and development of high performance finite element for large scale acoustic analysis method 査読あり
Takaoka E., Murakami Y., Takei A.
SIMULTECH 2019 - Proceedings of the 9th International Conference on Simulation and Modeling Methodologies, Technologies and Applications 353 - 359 2019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：SIMULTECH 2019 - Proceedings of the 9th International Conference on Simulation and Modeling Methodologies, Technologies and Applications
Copyright © 2019 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved. In recent years, numerical methods such as the finite element method are developed for sound field prediction of architectural spaces. However, large-scale analysis is often necessary because of the larger domains and the higher frequencies that we deal with in engineering applications. Therefore, we often only consider larger domains at low frequencies or high frequencies in smaller domains. In this paper, the iterative domain decomposition method (IDDM) is applied to solve transient and steady-state acoustic problems. By applying the IDDM, the effectiveness of the large-scale acoustic analysis can be shown. In addition, the results of introducing high-order elements into the analysis are shown.
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Application Development for Education on Scientific Experiments in Virtual Reality 査読あり
M. Sakamoto, T. Shinoda, T. Ishizu, M. Hori, A. Takei, T. Ito
International Journal of Recent Technology and Engineering 8 ( 4 ) 2019年
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Large-scale Numerical Electrostatic Analysis for Performance Evaluation of Insulators with Accreted Icicles 査読あり
A. Takei, T. Mizuma, M. Akatsuka, T. Yamada
International Journal of Applied Electromagnetics and Mechanics 60 ( 2 ) 187 - 207 2019年
担当区分：筆頭著者, 責任著者 掲載種別：研究論文（学術雑誌）
DOI： 10.3233/JAE-170168