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Kohji Futa
Simulation Systems Division, MITSUBISHI Precision Co., Ltd. (MPC), 345 Kami-machiya, Kamakura, 247–8505 Japan
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Toshiaki Kikuchi
Department of Earth and Ocean Sciences, National Defense Academy (NDA), 1–10–20 Hashirimizu, Yokosuka, 239–8686 Japan