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Jong Hyeon Baek
Department of Industrial Engineering, Ajou University, Suwon, 433-749, Korea
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Sung Jin Hwang
Department of Industrial Engineering, Ajou University, Suwon, 433-749, Korea
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Da Seu Ran Kim
Department of Industrial Engineering, Ajou University, Suwon, 433-749, Korea
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Kwang Oh Kim
Department of Industrial Engineering, Ajou University, Suwon, 433-749, Korea
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Sung Hwan Yang
Korea National College of Rehabilitation & Welfare, Korea
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Peom Park
Department of Industrial Engineering, Ajou University, Suwon, 433-749, Korea