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*Shoichi Matsuda
University of the Ryukyus, Department of Mechanical Systems Engineering, Faculty of Engineering
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Yasushi Tanahara
Okinawa Industrial Technorogy Center
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Hidenori Terasaki
Graduate school of Science and Technology, Kumamoto University
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Yuhei Onoda
University of the Ryukyus, Department of Mechanical Systems Engineering, Faculty of Engineering