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*Shoichi Matsuda
University of the Ryukyu, Faculty of Engineering, Department of Mechanical Systems Engineering
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Yawara Miyata
University of the Ryukyu, Faculty of Engineering, Graduate Student
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Izuru Senaha
University of the Ryukyu, Faculty of Engineering, Department of Mechanical Systems Engineering
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Sumio Kato
University of the Ryukyu, Faculty of Engineering, Department of Mechanical Systems Engineering