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*Hajime Kimura
Graduate School of Science and Engineering, Yamaguchi Univ.
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Toshiyuki Ikawa
Yachiyo Engineering Co, Ltd.
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Hiroaki Komuro
Dept. Geoscience, Shimane Univ.
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Kenji Takeda
Department of Education, Yamaguchi Univ.
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Teruyoshi Imaoka
Graduate School of Science and Engineering, Yamaguchi Univ.