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윤원영(Won-Young Yun),손범신(Bum-Shin Son),최용석(Yong-Seok Choi) 한국항해항만학회 2009 한국항해항만학회지 Vol.33 No.6
컨테이너터미널에서 사용되는 컨테이너 크레인은 컨테이너 선박의 컨테이너를 양적하하는 주요 장비이다. 크레인이 고장이 나면, 컨테이너터미널의 생산성을 감소시킬 것이다. 본 논문은 컨테이너 크레인에 대한 예방정비 일정을 다룬다. 컨테이너 크레인은 많은 부품으로 구성되고 3개의 모델을 사용하여 컨테이너 크레인의 구조를 분석한다. 그리고 최적의 예방정비 일정을 결정하기 위하여 유전자 알고리즘을 적용하고 시뮬레이션 시스템을 통해서 제안된 방법의 성능을 평가한다. 마지막으로 작업일정에 기초하여 산업체에서 발견된 예방정비 일정을 조정하는 방법을 설명한다. Container cranes are main equipments to load and unload containers to container ships at container terminals. If a crane breakdowns,it can reduce the productivity of container terminals. This paper deals with Preventive Maintenance (PM) schedules for the container cranes The cranes consist of many parts and we analyze the structure of a container crane using the tree models. Next, we apply a Genetic Algorithm (GA) for determining optimal PM schedule and evaluate the performance of the proposed method through simulation system Finally, we explain how to adjust the PM schedule found in industry based on work schedules.
윤원영,유승효 한국경영과학회 1995 韓國經營科學會誌 Vol.20 No.1
This paper compares the two warranty policies which are used in Korean electronic appliance industry. Policy I is a general warranty policy under which all of failures during warranty period (12 months) are repaired without charge. Policy Ⅱ was proposed recently by a company. Under policy Ⅱ, when the product fails until a certain time (6 months), the failed product will be replaced by the new product and all other failures from the certain time to the warranty period (24 months) will be repaired free. We obtain the expected total warranty costs per product and necessary conditions under which the Policy Ⅱ has a meaning in economic point of view without or with discount rate. Some numerical examples are considered.
공 컨테이너를 고려한 컨테이너 내륙수송에서의 차량배치문제
윤원영,안창근,최용석 한국경영과학회 1999 한국경영과학회지 Vol.24 No.4
In the container transportation of inland depots the empty container is an important issue. The truck dispatching problem in this paper is considered under restriction about empty containers. When a full container arrives in a depot by truck, after unloading operation the full container is changed to an empty container. After loading operation an empty container is changed to a full container. We suggest an integrated approach to the problem of simultaneously managing empty truck and container movements. We would like to find the truck dispatching method minimizing empty truck movements and empty container movements. In this paper, a mixed integer programming model is developed to obtain the optimal truck dispatching in container transportation and heuristic is developed to give a good solution in much shorter time. The numerical examples are studied and the proposed heuristic is also compared with the result of numerical examples.