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A Lagrangian Relaxation Method for Parallel Machine Scheduling with Resource Constraints
김대철,Kim, Dae-Cheol Korean Institute of Industrial Engineers 1998 산업공학 Vol.11 No.3
This research considers the problem of scheduling jobs on parallel machines with non-common due dates and additional resource constraints. The objective is to minimize the total absolute deviation of job completion times about the due dates. Job processing times are assumed to be the same. This problem is motivated by restrictions that occur in the handling and processing of jobs in certain phases of semiconductor manufacturing and other production systems. We examine two problems. For the first of these, the number of different types of additional: resources and resource requirements per job are arbitrary. The problem is formulated as a zero-one integer linear programming and the Lagrangian relaxation approach is used. For the second case, there exists one single type of additional resource and the resource requirements per job are zero or one. We show how to formulate the problem as an assignment problem.
김대철,이근호,김형의,Kim, Dae-Cheol,Lee, Geun-Ho,Kim, Hyeong-Ui 한국기계연구원 2002 硏究論文集 Vol.32 No.-
This study was performed to develop accelerated life test method of machanical parts using cumulative damage theory that used to model the fatigue of parts that receive variable load. The cumulative damage theory was introduced, and the estimation of life and calculation of accelerated life test time was illustrated. As the actual application example, accelerated life test method of agricultural tractor transmission was described. Life distribution of agricultural tractor transmission was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 3,000 hours and 90% reliability for one test sample. According to the cumulative damage theory, because test time can shorten in case increase test load, test time could be reduced by 482 hours when we put the load 1.1 times of rated load than 0.73 times of rated load that is equivalent load calculated by load spectrum of the agricultural tractor. This time, acceleration coefficient was 11.7. This accelerated test method was used to develop accelerated test method of gear reducer, hydraulic hose and bearing as well as agricultural tractor transmission and it is considered to be applied comprehensively to machanical parts the fatigue of which is happened by load or pressure etc.
김대철(Dae Cheol Kim),김재범(Jae Bum Kim),조근태(Keun Tae Cho) 한국경영과학회 2013 經營 科學 Vol.30 No.2
The objective of this paper is to provide an improved technology appraisal model, which considers a variety of macroeconomic variables such as consumer price index and producer price index. The improved model was built using cross correlation analysis and logistic regression analysis. The AUROC analysis showed that goodness-of-fit of the proposed model turned out to be improved than that of the existing model. The model proposed in the paper would be helpful for making a reasonable investments and financing decision, lessening the default rates by systematic risk management, and enhancing the technology commercialization capabilities.
병렬기계로 구성된 인쇄회로기판 제조공정에서의 스케쥴링에 관한 연구
김대철(Dae-Cheol Kim) 한국산업경영시스템학회 2004 한국산업경영시스템학회지 Vol.27 No.4
This research considers the problem of scheduling Jobs on unrelated parallel machines with a common due date The objective is to minimize the total absolute deviation of Job completion times about the common due date. This problem is motivated by the fact that a certain phase of printed Circuit board manufacturing and other production systems is bottle-neck and the processing speeds of parallel machines in this phase are different for each Job. A zero-one integer program-ming formulation is presented and two dominance properties are proved. By these dominance properties, It is shown that the problem is reduced to asymmetric assignment problem and is solvable in polynomial time
김대철(Dae-Cheol Kim) 한국산업경영시스템학회 2006 한국산업경영시스템학회지 Vol.29 No.2
This study considers the problem of scheduling jobs on uniform parallel machines with a common due date. The objective is to minimize the total absolute deviation of job completion times about the common due date. This problem is motivated by the fact that a certain phase of printed circuit board manufacturing is bottleneck and the processing speeds of parallel machines in this phase are uniformly different for all jobs. Optimal properties are proved and a simple polynomial time optimal algorithm is developed.