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		Journal of Korean Society of Industrial and Systems Engineering :: Vol.40 No.2 pp.129-136 DOI:https://doi.org/10.11627/jkise.2017.40.2.129 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.40 No.2 pp.129-136
			DOI:https://doi.org/10.11627/jkise.2017.40.2.129
			 
			