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*Yasuyuki Miyano
Faculty of education and Human studies, Akita university
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Hidetoshi Fujii
Joining and Welding Institute, Osaka University
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Yufeng Sun
Joining and Welding Institute, Osaka University
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Yasuyuki Katada
National Institute of Material Science
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Kouichi Ieko
Gradutae School of Engineering and Resource Science
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Osamu Kamiya
Gradutae School of Engineering and Resource Science