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Department Emeritus, Tohoku University, Hachinohe Institute of Technology, 5-28-13, Kunimigaoka, Aoba-ku, Sendai 989-3201, Japan Department Emeritus, Tohoku University, Hachinohe Institute of Technology, 5-28-13, Kunimigaoka, Aoba-ku, Sendai 989-3201, Japan