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Shuichi Adachi
Faculty of Engineering, Utsunomiya University, 7–1–2 Yoto, Utsunomiya, 321–8585 Japan
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Michiya Ogawa
Faculty of Engineering, Utsunomiya University, 7–1–2 Yoto, Utsunomiya, 321–8585 Japan
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Akira Takahashi
Honda R&D Co., Ltd., 4730 Haga-machi, Haga-gun, Tochigi, 321–3393 Japan
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Hisashi Sano
Honda R&D Co., Ltd., 4730 Haga-machi, Haga-gun, Tochigi, 321–3393 Japan