• Journal of Information Technology Applications and Management
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• 제11권3호
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• pp.77-87
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• 2004

The importance of information systems(IS) operations and maintenance is increasing as the costs of IS operations and maintenance take larger share of total IS costs and organization's dependency on IS is increasing. However, this area has received relatively little attention from scholars and practitioners despite of its significance. The main objectives of this study are to provide practical guidelines for improving IS operations and maintenance practices, and to propose a research framework for this area. To accomplish this objectives, the following three issues are investigated. First, IS operations and maintenance practices of a case company are analyzed. Second, the current practices are compared with best practices. Finally, suggestions are made based on the analyses to improve the IS operations and maintenance practices.

• 한국건축시공학회지
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• 제5권1호
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• pp.97-103
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• 2005

Building costs means capital costs which include cost of land, costs of acquiring and preparing the site, construction costs, professional fees, furnishings, cost of financing the project. and cost of management required to run and maintenance the building for use. There are several phases that determine the building costs : design phase, construction phase, and operation & maintenance phase. So, the cost of work could be set against the examining the full range of complexities that a building program might contain. To solve this problem, it needs to compute building cost systematically. This is still in the development stage, awaiting the organization of rational cost data base. The method of cost saving by cost control could be constituted by detailed knowledge of building costs for all possible combinations of components and subsystems that can be assembled into integration model of cost factor on each phase of project development. The model of cost saving in each building phase is available for procedures of cost control of building systems.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.266-269
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• 2003

도로시설물의 수명동안 비용이 최소가 되는 최적의 건설 및 유지관리 전략을 수립하기 위해서는 시설물에 대한 체계적인 LCC분석이 이루어져야 하지만 아직 국내 건설프로젝트 중 토목시설물에 대한 LCC연구는 거의 이루어지지 못하여 이에 대한 기초적 연구 및 실적자료가 절실히 필요한 시점에 와 있다. 본 연구에서는 사례교량의 LCC분석을 통해 유지관리 실태를 파악하고, 장래 요구되는 유지관리수준과의 비교분석을 통해 적정유지관리수준을 제시함과 동시에 아직 사례가 별로 없는 교량구조물에 대한 실적 LCC 기초자료를 얻고자 하였다. 본 연구를 통해 LCC 측면에서 볼 때, (1) PSC교나 RC교에 비해 강교가 경제적임을 알 수 있었으며, (2) 향후 더욱 적극적인 유지관리가 필요한 것으로 분석되었다.

• 전기학회논문지
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• 제62권11호
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• pp.1511-1519
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• 2013

This paper proposes the allocation method for capacitor-reactor banks in a distribution system with dispersed generators to reduce the installation costs, the maintenance costs and minimize the loss of electrical energy. The expected lifetime and maintenance period of devices with moving parts depends on the total number of operations, which affects the replacement and maintenance period for aging equipment under a limited budget. In this paper, the expected device lifetimes and the maintenance period are included in the formulation, and the optimal operation status of the devices is determined using a genetic algorithm. The optimal numbers and locations for capacitor-reactor banks are determined based on the optimal operation status. Simulation results in a 69-bus distribution system with the dispersed generator show that the proposed technique performs better than conventional methods.

• 한국건축시공학회지
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• 제17권5호
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• pp.473-481
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• 2017

국방부는 노후 된 병영생활관 현대화 개선을 추진하여 고시된 75개 사업 중 60개 사업이 운영 중에 있다. 따라서 과거에는 데이터 조사 분석이 어려움이 많았으나 현재는 민간 운영사로부터 정보를 파악하고 분석할 수가 있다. 본 연구에서는 시설물의 사용성을 높이기 위하여 병영시설물의 3~5년 수선유지비의 예산과 사용 데이터를 조사 및 분석하여 문제점을 도출하여 수선유지비에 대하여 합리적인 대안을 제시하는 목적으로 하였다. 이에 맞게 이론적 고찰 및 선행 연구, 수선유지비에 대한 법적인 근거, 국방부 병영시설 BTL사업의 수선유지비 예측 비용과 사용 데이터를 분석하였다. 도출된 문제점으로는 첫째는 소모품, 없는 항목, 누락 항목에 대하여 예산을 추가로 확보하는 개선방안을 제시 하였다. 둘째는 평균으로 분할하는 지급에 대하여서는 3~5년 운영기간에는 축소하여 지급하는 개선방안과 장기수선계획 수립기준으로는 예산이 없거나 작게 지급되어 3~5년 운영기간에는 예산을 추가 또는 보완하여 지급하는 개선방안을 제시하였다. 향후 병영시설의 운영기간과 실적 데이터가 추가로 확보가 가능한 시점에 수선유지비 효율적 연구는 보완되어야 한다. 본 연구는 향후 국방부 병영시설 건설에 대하여 사업비를 합리적으로 유도하는데 기여할 수 있을 것이다.

• 한국컴퓨터정보학회논문지
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• 제18권5호
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• pp.77-85
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• 2013

본 연구는 소프트웨어의 변경을 가하는 순수 유지보수 비용 외에 운영 관리 및 서비스 향상을 위한 비용 측정지표를 도출하고 이를 기반으로 정보시스템유비보수 비용 추정 모델을 제안한다. 운영 관리 및 서비스 향상 측정지표는 선행연구를 요약 분류하여 지표의 기반으로 도출하고 경험적인 측정지표를 추가 보완하였으며, 이를 근거로 유지보수 비용 추정 모델을 제안한다. 제안한 측정지표는 정보시스템 유지보수 범위에 따라 선택적으로 사용할 수 있어 상세한 유지보수 비용 산정이 가능하다. 제안한 유지보수 비용 측정지표와 비용 추정 모델의 유효성을 검증하기 위하여 기존의 연구와 비교 검증하여 유효성을 입증하였다.

• 풍력에너지저널
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• 제14권3호
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• pp.34-42
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• 2023

The reduction of operation and maintenance (O&M) costs is a critical factor in determining the competitiveness of wind energy. Predictive maintenance based on the estimation of remaining useful life (RUL) is a key technology to reduce logistic costs and increase the availability of wind turbines. Although a mechanical component usually has sudden changes during operation, most RUL estimation methods use the trend of a state index over the whole operation period. Therefore, overestimation of RUL causes confusion in O&M plans and reduces the effect of predictive maintenance. In this paper, two RUL estimation methods (load based and data driven) are proposed for the bearings of a wind turbine with the results of trend classification, which differentiates constant and increasing states of the state index. The proposed estimation method is applied to a bearing degradation test, which shows a conservative estimation of RUL.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1134-1141
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• 2011

Costs have long since become a major issue in railway system analysis, attention is not limited to the acquisition costs alone, but encompasses all costs involved in the use and disposal of the systems. Concepts such as Life Cycle Cost(LCC), Costs Of Ownership(COO), or Total Ownership Cost(TOC) are more and more frequent in any document dealing with system analysis. Most of railway projects have applied this LCC Model to evaluate effectiveness of system acquisition cost. But these action of LCC model does not applied all the rest of system life cycle period due to the differences of its responsibility. This is why a study has been undertaken by the operation party to harmonize the most important aspects of the LCC model. This study focused on these and other objectives for introduction of method and needs for an action plan for maintenance actions involved relevant cost allocation.

• 전기학회논문지
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• 제63권2호
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• pp.205-210
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• 2014

The micro grid considered in this paper consists of a diesel generator, a photovoltaic array, a wind turbine, a fuel cell, and a energy storage system. This paper explains and simulates the micro grid components in terms of accuracy and efficiency of having a system model based on the costs of fuel as well as operation and maintenance. For operational efficiency, the objective function in a diesel generator consists of the fuel cost function similar to the cost functions used for the conventional fossil-fuel generating plants. The wind turbine generator is modeled by the characteristics of variable output. The optimization is aimed at minimizing the cost function of the system while constraining it to meet the customer demand and safety of micro grid. The operating cost in fuel-cell system includes the fuel costs and the efficiency for fuel to generate electric power. To develop the overall system model gives a possibility to minimize of the total cost of micro grid. The application of optimal operation can save the interruption costs as well as the operating costs, and improve reliability index in micro grid.

• 품질경영학회지
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• 제31권1호
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• pp.142-147
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• 2003

Burn-in is a widely used method to eliminate the initial failures. Preventive maintenance policy such as block replacement with minimal repair at failure is often used in field operation. In this, paper burn-in and maintenance policy are taken into consideration at the same time. The cost of a minimal repair is assumed to be a non-decreasing function of its age. The problems of determining optimal burn-in times and optimal maintenance policy are considered.