• Proceedings of the KSR Conference
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• 2009.05a
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• pp.198-205
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• 2009

It is known that the operation and maintenance cost is generally higher than the acquisition cost of rolling stocks. It is very important for reducing the operation and maintenance cost to acquire the rolling stocks which are well designed with regard to the operation and maintenance cost. Therefore life cycle cost including the operation and maintenance cost is needed to be considered from the acquisition phase. This article presents a procedure and a model for life cycle cost which are applicable to the acquisition of rolling stocks.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.490-492
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• 2016

급속한 기술환경의 변화와 정보화 사회의 도래에 따라 시스템의 구축 비용보다 더 많은 비용이 유지보수에 투입되고 있다. ERP(SAP)는 공통의 package를 사용하므로 서로 다른 업종, 조직이라 하더라도 통합운영관리가 비교적 용이하다. 통합운영은 고객의 유지보수비용을 줄이고, 유지보수입장에서도 적은 인원으로 효과적인 운영이 가능하게 하다. 하지만, 여기서 나타나는 문제점을 사례를 통해 제시하고 분석하여 그 개선방향을 제시하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.18 no.5
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• pp.77-85
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• 2013

In this paper, we present the cost measurement metrics for the operation management and service improvement besides the general maintenance. The cost measurement metrics of the operation management and service improvement are based on the metrics that are classified and summarized precedent studies and complemented by empirical measuring indicators, and we propose the maintenance cost estimation model based on this metrics. The maintenance costs can be calculated detailedly, because the proposed metrics can be used selectively, depending on the scope of the information system maintenance. The effectiveness of the proposed maintenance cost measurement metrics and cost estimation model is verified by comparison between existing studies and our research.

• Journal of the Korean Society for Railway
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• v.13 no.3
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• pp.257-263
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• 2010

Operation and maintenance cost of a rolling stock is generally higher than its acquisition cost. Therefore, it is necessary for reducing life cycle cost (LCC) to make rolling stocks easy and low costly for operation and maintenance. In addition, their operation and maintenance support systems should be effective and efficient. To accomplish this, operator should specify LCC requirements in the early stage of acquisition and make a contractor to provide the rolling stocks of low LCC. This article presents a procedure and a verifiable LCC model available in the general acquisition process where an operator specify requirements and a contractor provide the rolling stock meeting the requirements.

• Journal of Advanced Navigation Technology
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• v.20 no.6
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• pp.511-518
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• 2016

RAPCON non only controls landing/take-off procedures but also approaching air traffics within 60-70 NM range of air force base. This paper, first of all, tries to research the failure rate per operation hours, mean time between failure (MTBF) of RAPCON according to six blocks such as interrogator, receiver, power unit, display unit, data process unit and antenna. In addition, this paper estimates the maintenance cost over next 10 months based on 50 monthly maintenance cost data. Considering the maintenance cost data from RAPCON which has been used over designed service life span, it is no doubt the forecasted data proved the monthly cost would go up incrementally during the rest of economic life of the facility. Such research result is also proven to be the same with the result of bathtub curve data during operating life.

• 한국항공운항학회:학술대회논문집
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• 2016.05a
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• pp.136-141
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• 2016

본 논문에서는 항행안전시설을 구성하는 구성요소를 체계별로 구분하고 체계별 운영시간 에 따른 고장율 등을 분석한다. 아울러 설계수명에 점차 도달한 항행안전시설 운영단계에서 발생한 유지보수비용 데이터를 토대로 남은 설계수명 기간 동안 향후 발생 가능한 유지보수 비용을 추정한다. 이런 분석결과를 통해 장비의 신뢰성 관련 선행연구들에서 주로 인용되고 있는 욕조커브(Bathtub Curve) 이론과 본 연구의 비용예측 결과와의 연관성을 진단하고 안정적인 유지보수를 위한 기초자료로서 활용되고자 한다. ARIMA 예측모형을 토대로 향후 10개월 간 발생가능한 유지보수 비용을 예측한 결과 비용이 상승할 것이라는 통계적으로 신뢰할 만한 추정 결과를 얻었다. ARIMA를 활용한 추정결과는 앞선 MTBF 분석내용을 지지함과 동시에 시설의 정비 신뢰도를 보여주는 욕조커브 분포와 일치하는 신뢰할 수 있는 결론을 얻은 것이다.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.126-128
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• 2006

현재 배전부분도 사업부체제로 진행됨에 따라 구역 및 지역별로 배전계통을 운영하는 경쟁체제에 돌입하게 되었다. 또한 각 사업부별로 예산을 추진하여 배전계통을 운영하게 되며 배분된 예산으로 배전계통의 신뢰도 및 경제적 운영을 일정 수준으로 유지하여 타 사업부와 사업성을 경쟁해야 한다. 특히, 각 배전 사업부별로 경쟁해야 하므로 최소의 비용으로 최대의 유지보수 효과를 얻을 수 있는 방법을 개발해야 하며, 비용을 최소로 하여 최적의 점검 주기를 찾는 문제는 중요하다고 할 수 있다. 본 논문에서는 최적 유지보수 기기 선정과 최적 유지보수 주기를 결정하는데 있어서 적합한 기법인 배전 계통 유지보수 기법(Reliability Centered Maintenance, RCM)을 이용하였다. 이의 구현을 위하여 Markov chain 기법을 배전 계통 기기의 유지보수 모델에 적합하도록 수정하여 유지보수에 필요한 비용과 기기의 고장으로 인하여 발생할 수 있는 정전비용 등을 고려하여 최적의 점검 주기를 결정하고자 한다. 제안된 RCM의 알고리즘은 Dynamic Programming을 이용하여 점검 및 유지보수에 필요한 기기를 결정하는 부분과 유지보수의 실행 여부를 결정하는 decision 부분으로 되어있다. 사례연구를 통하여 본 논문에서 제안된 알고리즘의 적용가능성을 살펴보았다.

• Journal of the military operations research society of Korea
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• v.35 no.3
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• pp.31-45
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• 2009

Reliability should be done from the initial stage of development to secure performance and safety of system. To establish and achieve target reliability of a system, reliability should be allocated into the subsystems. In the acquisition and development of a system, frequent failures will cause a negative effect on performing mission and occurs increasing operating cost. This study reviewed and evaluated the existing reliability allocation models using operation and maintenance costs to find the correlation between reliability allocation models and its operating cost. A target system reliability on the diesel engine to be developed for naval vessels is allocated into its subsystem based on the existing reliability allocation models. A selection methodology for reliability allocation models was made to minimize operating cost by using simulation based on the given operating diesel engine data for naval vessels.

• Journal of Aerospace System Engineering
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• v.17 no.5
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• pp.1-10
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• 2023

This research sought to determine the optimal cycle of Planned Depot Maintenance (PDM) for Unmanned Aerial Vehicle (UAV), and PDM through Reliability and Maintainability-based simulation and Operating and Support (O&S) cost analysis using Reliability and Maintainability analysis results. The effectiveness of the PDM was verified economically, and the optimal PDM interval that balances UAV effective operations and sustaining engineering costs was presented.

• Korean Journal of Construction Engineering and Management
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• v.7 no.6
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• pp.185-192
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• 2006

The maintenance expenses of public rental housing have drastically been increased as facilities become obsolete. As an effective means of managing such a situation, accurate estimating of maintenance expenses and securing financial resources are crucially important. It, therefore, is necessary to analyze major factors affecting on maintenance expenses of public rental housing's facilities, and develop an effective instrument to estimate them. On the other hand, the U.S.A, where approximately 60 percent of public rental housing's operating costs are supported by the state, has already developed an effective tool to forecast operating costs based on several years' actual data. As a result, public rental housing has been operating with a reasonable level. However, there have been no remarkable researches and studies in this field in Korea. In this context, this study attempts to examine principal determinants of maintenance expenses of public rental housing's facilities, and their influence based on the latest five years' actual operating costs. This study may contribute to develop an objective and precise tool to forecast maintenance expenses of public rental housing.