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*Byung-Chan Min
Department of Industrial & Management Engineering, Hanbat National University , Daejon, Korea
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Jin-Whan Kwon
Department of Industrial & Management Engineering, Hanbat National University , Daejon, Korea
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Beum-Soo Lee
Department of Industrial & Management Engineering, Hanbat National University , Daejon, Korea
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Young-Sun Kim
Department of Industrial & Management Engineering, Hanbat National University , Daejon, Korea
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Jin-Kyu Kang
Department of Industrial & Management Engineering, Hanbat National University , Daejon, Korea