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		Journal of Korean Society of Industrial and Systems Engineering :: Vol.44 No.2 pp.78-84 DOI:https://doi.org/10.11627/jkise.2021.44.2.078 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.44 No.2 pp.78-84
			DOI:https://doi.org/10.11627/jkise.2021.44.2.078
			 
			