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*Zen-ei Tanaka
Yamagata Research Instituteof Technology
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Kenyu Handa
Yamagata Research Instituteof Technology
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Yuji Miyamoto
Asahi Diamond Industrial Co.,Ltd.
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Katsuo Syoji
Tohoku University Professor Emeritus
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Tsunemoto Kuriyagawa
[in Japanese]
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Jiwang Yan
Tohoku University
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Author's Organization:Yamagata Research Instituteof Technology