Affiliation: | 1. Department of Industrial and Information Engineering, Korea University, #5-1 Anamdong, Sungbukku, Seoul 136-701, Republic of Korea;2. School of Transportation Systems Engineering, University of Ulsan, Ulsan, Republic of Korea;3. Department of Information and Industrial Engineering, Yonsei University, Seoul, Republic of Korea;4. Kyungsung University, Department of Industrial Engineering, Kyungsung University, Pusan, Republic of Korea |