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		Journal of Korean Society of Industrial and Systems Engineering :: Vol.42 No.4 pp.194-202 DOI:https://doi.org/10.11627/jkise.2019.42.4.194 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.42 No.4 pp.194-202
			DOI:https://doi.org/10.11627/jkise.2019.42.4.194
			 
			