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*Keita Shigihara
Graduate Student, Graduate School of Engineering, Nagaoka University of Technology
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Kaori Urabe
Graduate Student, Graduate School of Engineering, Nagaoka University of Technology
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Nobuhiko Azuma
Professor, Graduate School of Engineering, Nagaoka University of Technology
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Masato Aketagawa
Professor, Graduate School of Engineering, Nagaoka University of Technology
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Morimasa Takata
Assistant Professor, Graduate School of Engineering, Nagaoka University of Technology