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Yoshiharu Mutoh
Dept. of Mechanical Engineering, Nagaoka Univ. of Tech.
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Jin Quan Xu
School of Civil Engineering and Mechanics, Shanghai Jiaotong Univ.
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Yukio Miyashita
Dept. of Mechanical Engineering, Nagaoka Univ. of Tech.
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Nobuhiro Hashimoto
Graduate school of Mechanical Engineering, Nagaoka Univ. of Tech.