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*Akira Takatsu
faculity of engineering, shinshu university
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Kouichi Nozaki
faculity of engineering, shinshu university
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Masahiro Mizuno
faculity of engineering, shinshu university
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Nobuaki Sato
faculity of engineering, shinshu university
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Takahisa Kanda
faculity of engineering, shinshu university
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Yoshihiko Amano
faculity of engineering, shinshu university