- 
		
		
		Journal of Korean Society of Industrial and Systems Engineering :: Vol.44 No.2 pp.1-14 DOI:https://doi.org/10.11627/jkise.2021.44.2.001 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.44 No.2 pp.1-14
			DOI:https://doi.org/10.11627/jkise.2021.44.2.001
			 
			