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*Young Joon Jung
Division of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
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Young Seok Kim
Division of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
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Tae Ho Kim
Division of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
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Kyu Ho Lee
Division of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
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Bong Ki Ryu
Division of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea