• 비파괴검사학회지
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• 제30권5호
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• pp.497-502
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• 2010

발전회사는 설비 신뢰성과 이용율 저하없이 운영 및 정비비용을 낮추라는 요구를 받고 있다. 설비 운영자는 이러한 요구사항에 부합하기 위하여 현재의 정비기술에 대하여 다시 평가를 하고 있다. 정비비용을 낮추고 효율적인 운영 기간을 늘리기 위하여 설비의 최적 운영상태를 확인할 수 있는 비파괴기술을 이용하여 예측정비 기법을 적용할 수 있다. 예측정비 프로그램에는 내부운영 프로그램과 외부프로그램 그리고 혼용 프로그램이 있으며, 현명한 신뢰 (smart thrust)개념을 사용하면 예측정비 프로그램을 성공적으로 적용할 수 있다.

• 대한산업공학회지
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• 제37권4호
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• pp.390-399
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• 2011

Generally the life-cycle cost of complex systems composed of several sub systems or equipments such as train, aircraft weapon systems is spent much more during operation and maintenance phase than development phase. The maintenance cost for maintaining the availability and extending the life span of systems comprise a large proportion of systems operation cost. The cycle of preventive maintenance affects operation and maintenance cost a lot. In this study we introduce a way minimizing life-cycle cost of systems by calculating more reliable preventive maintenance period than the results of previous study using systems reliability data considered the reliability and failure effect ratio of sub-systems or components. We can solve the preventive maintenance period problem known as NP-Hard as quick as possible by using modified genetic algorithm than using other models introduced in previous study.

• 한국구조물진단유지관리공학회 논문집
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• 제13권4호통권56호
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• pp.101-106
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• 2009

현재 시설물의 안전 및 유지관리 선진화를 위한 국가 기본시책과 비전을 제시하고 시설물을 효율적으로 관리할 수 있는 체계를 마련하기 위하여 안전 및 유지관리 기본계획이 수립되어 추진하고 있는 실정이다. 이와 같이 선진국에서 수행하고 있는 시설물에 대하여 예방적이고 적극적인 보수 보강을 수행하는 예방적 유지관리전략을 우리나라에서도 적극적으로 도입하여 안전 및 유지관리체계를 마련하고 이를 수행하는 것이 필요할 것으로 판단된다. 또한 시설물의 안전 및 유지관리기술에 생애주기분석기법을 적극적으로 도입하여 경제성을 높일 수 있는 기반을 마련해야 하겠다. 따라서 본 논문에서는 시설물의 안전 및 유지 관리의 체계, 제도적 문제, 예산 등에 대한 현재 국내의 실태와 문제점에 대한 분석과 함께 개선방안을 제시하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제12권3호
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• pp.183-190
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• 2008

국가 중요시설물인 터널에 대한 유지관리업무는 관리주체별, 용도별, 터널 규모별로 각각 상이하게 수행되고 있다. 현재 각 관리주체별로 운영중인 국내 터널유지관리시스템을 분석해보면 수기 또는 초보적인 전산화만이 되어 활용도가 매우 저조한 것이 현 상태이다. 이에 본 연구에서는 터널의 계획, 설계, 시공 단계의 관련자료 뿐 아니라 보수 보강 이력 자료 등의 유지관리단계에서 조사된 여러 현장조사와 터널 스캐너에 의한 결과를 통합한 새로운 터널유지관리시스템을 구축하여 국내 여러 터널 현장에 적용한 후, 이의 적용성을 분석하였고, 터널 유지관리방법의 개선안을 제안하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1359-1370
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• 2008

In the track geometry such as rails, sleepers, ballasts and fastener, track deterioration occurs by repetitive train weight and the high-speed railway takes a trend faster than normal. Track deterioration of over threshold value harms ride comfort and furthermore affect in trains safety seriously. An organic and systematic track maintenance system is very important because a trend of the track deterioration effects on track life-cycle and running safety. Also costs of the railway track permanent way and its maintenance are extremely large, forming a significant part of the total infrastructure expenditure. Therefor reasonable and efficient track maintenance has to be planed on a budget. It is required to carry out not only corrective maintenance but preventive maintenance for the track maintenance. In order to perform maintenance jobs in the boundary of the machines and resources given regarding the type and amount jobs, it is necessary to determine feasible or optimal scheduling considering the priority. In this study, the system organization and required functions for the development of track maintenance system supported track deterioration prediction and optimal scheduling are proposed.

• 플랜트 저널
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• 제9권4호
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• pp.37-42
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• 2013

화력발전소와 같은 대규모 플랜트 설비는 복잡하여 고장이 발생할 경우 고장발생 설비, 시기 및 원인을 정확하게 파악하는 것이 쉽지 않기 때문에 무엇보다 고장을 사전에 예방하는 것이 중요하다. 최근 들어 정비업무에 대한 관점과 중요성이 점차 변화해 가고 있고 주기정비 방식에서 벗어나 상태기반 정비방식으로 발전되고 있다. 본 연구에서는 상태정비에 주안점을 두고 신뢰도중심정비 방법을 화력발전소, 특히 석탄취급설비에 적용하여 정비주기를 선정하고자 하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.331-340
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• 2009

This study is objected by suggesting rationalization method of management and maintenance cost for railway investment assessment. The estimate of rational benefit and cost are a work of vital importance to decide railway investment as preliminary feasibility investigation is institutionally reinforced since January 2007. In particular, railway management and maintenance cost have to be applied to realistic and detail cost as railway investment assessment guide. For example, types of railway, construction of new line, improvement of conventional line, double tracking, railway electrification. However, railway investment assessment is inconsistency because of estimating the railway management and maintenance cost using existing unrealistic management and maintenance cost. Therefore, this study is performed parametric analysis effecting on the railway management and maintenance cost considered new technique, enhanced facilities and improved standard. Also, it suggests the itemized standard management and maintenance cost. Finally, it will be helped to establish the base of railway investment through the rationalization method of management and maintenance cost.

• Journal of Electrical Engineering and Technology
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• 제7권6호
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• pp.814-823
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• 2012

Electric power transmission utilities make an effort to maximize profit by reducing their electricity supply and operation costs while maintaining their reliability. The development of maintenance strategies for aged components is one of the more effective ways to achieve this goal. The reliability centered approach is a key method in providing optimal maintenance strategies. It considers the tradeoffs between the upfront maintenance costs and the potential costs incurred by reliability losses. This paper discusses the application of the Particle Swarm Optimization (PSO) technique used to find the optimal maintenance strategy for a transmission component in order to achieve the minimum total expected cost composed of Generation Cost (GC), Maintenance Cost (MC), Repair Cost (RC) and Outage Cost (OC). Three components of a transmission system are considered: overhead lines, underground cables and insulators are considered. In regards to aged and aging component, a component state model that uses a modified Markov chain is proposed. A simulation has been performed on an IEEE 9-bus system. The results from this simulation are quite encouraging, and then the proposed approach will be useful in practical maintenance scheduling.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1487-1493
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• 2008

Railway vehicle is very important to implement the effective maintenance in proper to prevent any failure during operation period. Many railway authorities are making efforts to maintain the railway vehicle through scientific and systematic procedure. To achieve this, Reliability Centered Maintenance(RCM) is partially applied. The efficiency of RCM has proven and its terminology was familiar with nuclear power, military and chemical plant etc. since the commercial aircraft's industries has introduced the maintenance program based on the target of reliability. The application of RCM on railway vehicle can be utilized with systematic analysis method to select the best effective maintenance period and action to prevent the failures by selecting the equipment affecting the its safety and reliability. This paper is presented that the procedure of adequate and effective maintenance for railway vehicle by comparing among the related standards in example IEC60300-3,11, MIL-STD-2173, and technical documents or papers. In accordance with above result, RCM procedure is proposed to apply effectively for maintenance of railway vehicle. That is, (1) Analysis of data and Calculation of criticality per equipment (2) Selection of equipment to analyze (3) Analysis of failure mode and effect (4) Evaluation of maintenance method and period (5) Optimization of maintenance program through renewal of maintenance method and period.

• International Journal of Advanced Culture Technology
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• 제7권2호
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• pp.125-136
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• 2019

This study focuses(selected) on garden facilities of designer gardens created at the 1st and 2nd Seoul Garden Shows and examined installed facilities at each designer garden by categorization according to type, material and functions. The study observed problems occurring from maintenance of garden facilities as time passes by and collected basic data to develop maintenance guideline aiming to make contribution to further spreading and promotion of high quality garden culture. This study examined all gardens created at 1st and 2nd Seoul Garden shows in 2015 and 2016. There were 18 gardens built in 2015 and 16 in 2015.The study looked at responsible entities for maintenance of facilities and examined maintenance system for managing these gardens. Garden facilities of the study were categorized into paving, facility for rest, playground, water facility, environmental sculpture and planting media facility according to categorization by landscape design standards and construction guidelines. Target gardens of this study are maintained mostly by citizen gardeners who are passionately carrying out maintenance work while communicating with designers. However, these citizen gardeners lack technical knowledge to manage various facilities. Also, maintenance manuals submitted by garden designers do not offer sufficient details on facility maintenance which calls for professional maintenance and clear instructions on facilities from early phase of design.