• 산업경영시스템학회지
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• 제41권2호
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• pp.24-31
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• 2018

As a system complexity increases and technology innovation progresses rapidly, leasing the equipment is considered as an important issue in many engineering areas. In practice, many engineering fields lease the equipment because it is an economical way to lease the equipment rather than to own the equipment. In addition, as the maintenance actions for the equipment are costly and need a specialist, the lessor is responsible for the maintenance actions in most leased contract. Hence, the lessor should establish the optimal maintenance strategy to minimize the maintenance cost. This paper proposes two periodic preventive maintenance policies for the leased equipment. The preventive maintenance action of policy 1 is performed with a periodic interval, in which their intervals are the same until the end of lease period. The other policy is to determine the periodic preventive maintenance interval minimizing total maintenance cost during the lease period. In addition, this paper presents two decision-making models to determine the preventive maintenance strategy for leased equipment based on the lessor's preference between the maintenance cost and the reliability at the end of lease period. The structural properties of the proposed decision-making model are investigated and algorithms to search the optimal maintenance policy that are satisfied by the lessor are provided. A numerical example is provided to illustrate the proposed model. The results show that a maintenance policy minimizing the maintenance cost is selected as a reasonable decision as the lease term becomes shorter. Moreover, the frequent preventive maintenance actions are performed when the minimal repair cost is higher than the preventive maintenance cost, resulting in higher maintenance cost.

• 한국신뢰성학회지:신뢰성응용연구
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• 제17권3호
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• pp.246-255
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• 2017

Purpose: This study proposes the optimal PM (preventive maintenance) policy of leased equipment for lessee's decision-making using two types of reliability condition. Methods: We consider reliability threshold based PM model. Equipment reliability is estimated and used as condition variable. The effect of repair for maintenance is imperfect and represented by age reduction factor. Results: We provide two PM policies. Policy 1 is focused on minimized total cost. This policy guarantees reliability threshold until last maintenance action. Policy 2 focus on maintaining reliability threshold during leased period. The proposed approach provides optimal reliability threshold under number of PM. Through result, we finally construct decision-making process for lessee using reliability threshold and end of reliability. Conclusion: This study provides two PM policy for lessee's decision-making. Through numerical example, we get a result of optimal reliability threshold, number of PM, optimum alternative under lessee's reliability condition.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.409-412
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• 2000

In this paper we have implemented CH-MUX system which provides customers with various services, i.e. POTS, ISDN, digital leased line and so on, and supports not only UDLC but IDLC network configuration based on existing optical transmission facilities. Also the RCS equipment has been designed and implemented for remote monitoring and control of CH-MUXs. And then this paper has described IPC procedure and proposed other implemental methods of IPC channel. Service providers will be able to design and construct cost-effective access network with RCS and CH-MUX systems.

• 한국전자통신학회논문지
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• 제10권12호
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• pp.1373-1380
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• 2015

태양광발전소의 급속한 보급과 다양한 설계, 개발, 시공, 유지보수 관련 기술과 기업이 다양하게 공존하며 2010년 초반부터 구축된 최근의 태양광발전소는 발전단가의 하락에도 불구하고 주요 설비의 단가하락과 기술의 안정화로 발전소의 구축이 지속적으로 추진되고 있다. 최근에는 한정된 지상공간을 대체하는 지붕과 구조물 상단을 임차하여 시공하는 형태의 태양광발전소의 건립이 늘어나고 있다. 공장의 지붕, 창고나 물류센터의 지붕 등의 임차공간 설치 태양광발전소의 현황과 기술을 연구하고, 구축 시뮬레이션을 통하여 경제성을 분석하기 위한 검토와 연구를 진행 하였다.