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최정상,노인규 한국경영과학회 1994 한국경영과학회지 Vol.19 No.2
This research is concerned with production scheduling for a flexible manufacturing cell which consists of two machine centers with unlimited buffer space and a single automatic guided vehicle. The objective is to develop and evaluate heuristic scheduling procedures that minimize maximum completion time. A numerical example illustrates the proposed algorithm. The heuristic algorithm is implemented for various cases by SLAM Ⅱ. The results show that the proposed algorithm provides better solutions than Johnson's. It also gets good solutions to minimize mean flowtime.
다단계 자동가공/조립제조시스템에서 다목표 작업제어 기법
최정상,박해천 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1
This paper is concentraed on a study of operation control for mutiple objectives in a automated manufacturing system with multiple machining cells or assembly cells. Largest Sum Processing-time First(LSPF) was developed in order to minimize makespan, mean flowtime and maximize mean utilization and compare with Ho and Chang's algorithm(HC) and Hunsucker and Shah's algorithm(HS). The results show that LSPF provides better soutions than HC at 78.2% and than HS at 67.8% of total problems to frequency. LSPF reduces 5.8% of makespan by HC and 22.1% of the valus by HS and curtails 15.8%, 7.5% of mean flowtime by recpective algorithms(HC, HS). And mean utilization is also higher about 5.5%, 20.8% than HC and HS.
崔政祥 조선대학교 생산기술연구소 1992 生産技術硏究 Vol.14 No.2
In this paper, we develope a method for finding spare inventory level of the repairable item at each base under the constraint of specified minimum fill rate. In many industrial organizations and army there has been considerable interest in multi-echelon repair system. In order to use a limited defense budget efficiently and enhance the operation rate for the military equipement and a weapon, we must decide the rational spare inventory level at each base.
최정상,Choe Jeong-Sang 한국국방경영분석학회 1989 한국국방경영분석학회지 Vol.15 No.2
This study is concerned with the loss rate calculation for evaluating the safety of aircraft series. The objective of this study is to provide the estimation method of safety for the determination of aircraft series, when the aircraft is directly purchased off-the-shelf or co-produced. Especially, in case the initial operation capabilities of alternative aircrafts are substantially different, this research proposes the modified cumulative average method which can effectively estimate the safety of aircraft.