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*R. Arai
Graduate school of Nagaoka University of Technology. Dept. of Mechanical Engineering
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K. Saito
Graduate school of Nagaoka University of Technology. Dept. of Mechanical Engineering
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T. Takahashi
Graduate school of Nagaoka University of Technology. Dept. of Mechanical Engineering
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T. Onuma
Nagaoka University of Technology. Dept. of Mechanical Engineering
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M. Ito
Nagaoka University of Technology. Dept. of Mechanical Engineering