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*Takuya Sumi
Graduate School of Science and Technology, Kwansei Gakuin University
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Motohiro Tsuboi
Graduate School of Science and Technology, Kwansei Gakuin University
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Kuniyuki Furukawa
Faculty of Business Administration, Aichi University
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Tatsuo Kanamaru
Department of Geosystem Sciences, College of Humanities and Sciences, Nihon University