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		Journal of Korean Society of Industrial and Systems Engineering :: Vol.43 No.3 pp.1-9 DOI:https://doi.org/10.11627/jkise.2020.43.3.001 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.43 No.3 pp.1-9
			DOI:https://doi.org/10.11627/jkise.2020.43.3.001
			 
			