• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.125-129
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• 2007

In this paper, a PMS(Pavement Management System) application is presented to control the LCC(Life Cycle Cost) of road pavement. The aim of this paper is to provide the decision makers with the planning information regarding maintenance strategies for efficient road pavement management. The validity of PMS application presented in this paper is investigated through case studies for conducted for 22 national highway road sections in Korea.

• International Journal of Quality Innovation
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• 제7권3호
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• pp.15-23
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• 2006

A spare ordering policy is considered for planned maintenance. Introducing the ordering, uptime, downtime, inventory costs and salvage value, we derive the expected cost effectiveness. The problem is to determine jointly the ordering time for a spare and the preventive replacement time for the operating unit which maximize the expected cost effectiveness. Some properties regarding the optimal policy are derived, and a numerical example is included to explain the proposed model.

• 한국산학기술학회논문지
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• 제18권1호
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• pp.513-522
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• 2017

오늘날 세계는 빠르게 도시화가 되어가고 있으며 급속한 도시화에 따른 인구밀집현상은 교통 혼잡, 생태환경악화 등 도시의 전형적인 문제들을 초래하였으며, 폐기물 처리 및 공공위생, 치안 문제 등 도시 관리의 어려움은 점점 증대하고 있다. 특히 도시시설물 관리에 있어 정부와 지자체의 노력에도 불구하고 관리대상의 시설물 수와 종류가 많은 반면 관리인의 부족과 적정관리시스템의 부재로 인하여 도시민들이 많은 불편을 겪고 있다. 본 연구의 목적은 도시시설물의 유지관리 효율화를 위해 스마트폰을 활용한 관리방법을 제시하는 것이다. 연구결과 첫째, 스마트폰을 활용하여 시설물의 사진과 위치정보를 수집 및 전송하기 때문에 시설물의 정보관리, 유지보수관리, 이력관리 등 원스톱으로 유지관리 업무가 가능하다. 둘째, 유지보수관리는 스마트폰의 위치가 아닌 시설물, 즉, 피사체의 위치 및 사진정보를 기반으로 하기 때문에 시설물의 상태파악 및 빠른 조치가 용이하며, 스마트폰의 앱을 통해 유지보수 관리자에게 접수와 동시에 정보가 전송되기 때문에 효율적이다. 셋째, 시설물의 정보 및 각종 자료와 도면을 데이터베이스로 관리하기 때문에 이력관리 및 데이터의 활용이 용이하다. 넷째, 스마트폰의 앱을 통해 도시민 누구나 쉽게 활용이 가능하기 때문에 별도의 인프라 투자 없이 시설물관리자 기능으로서 확대가 용이하다. 마지막으로 위치 정보 기반으로 도로, 수목, 산책로 등 비 시설물의 관리가 가능하다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제16권3호
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• pp.224-230
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• 2016

Purpose: Military maintenance involves corrective and preventive actions carried out to keep a system in or restore it to a predetermined condition. This research develops an optimal maintenance cycle for aviation oil testing equipment with acceptable reliability level and minimum maintenance cost. Methods: The optimal maintenance policy in this research aims to satisfy the desired reliability level at the lowest cost. We assume that the failure process of equipment follows the power law non-homogeneous Poisson process model and the maintenance system is a minimal repair policy. Estimation and other statistical procedures (trend test and goodness of fit test) are given for this model. Results: With time varying failure rate, we developed reliability-based maintenance cost optimization model. This model will reduce the ownership cost through adopting a proactive reliability focused maintenance system. Conclusion: Based on the analysis, it is recommended to increase the current maintenance cycle by three times which is 0.5 year to 1.5 years. Because of the system's built-in self-checking features, it is not expected to have any problems of preventative maintenance cycle.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.702-707
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• 2008

교육시설물 BTL 사업은 2005년 긴요하고 시급한 공공시설물을 앞당겨 공급하겠다는 취지하에 시작되었으며, 2007년 3월 준공이 완료되어 운영단계로 접어들면서 유지관리 업무에 대한 관심이 증대되고 있다. 그러나 BTL 사업 시행 초기이고 처음 운영단계에 접어들면서 운영 및 유지관리 업무에 실적 Data가 전무한 실정이다. 이에 본 연구는 교육시설물 BTL 사업의 효율적인 유지관리 업무 수행을 위해 업무 프로세스 도출 및 유지보수 Item을 규명하였다. 이를 통해 유지보수 업무 수행 시 발생되는 정보를 DB화하여 효율성을 극대화 할 수 있는 교육시설물 유지관리시스템 모듈 설계를 목적으로 한다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.624-631
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• 2022

Highway Rest Areas are envisioned to provide an accessible space for rest and parking for travelers, especially those driving a long distance. In addition, modern highway Rest Areas provide many amenities to highway users, including wifi service, picnic tables, litter barrels, running water, public telephones, and sometimes even free coffee. Various studies were conducted in the domain of Rest Area facility design and their operating costs in different states; however, limited studies were conducted on the maintenance costs of these facilities. Therefore, this study's main objective is to compute the annual maintenance cost of Rest Areas in the state of Nevada. This study also analyzes the main cost categories of the maintenance works. The raw cost data of Nevada Rest Area maintenance from 1990 to 2012 were collected from the Nevada Department of Transportation (NDOT). Results show that the maintenance cost fluctuated over the study period; the maintenance cost decreased from 1991 to 2004 and then increased until 2012. The primary cost categories of maintenance work are labor, equipment, and material costs. Among these, labor cost was the largest category with 56 percent of the total maintenance cost, followed by equipment cost and material cost. The findings of this study may help NDOT and other transportation agencies plan their budget for future Rest Area maintenance activities.

• 대한안전경영과학회지
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• 제7권1호
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• pp.101-115
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• 2005

This study deals with the procedure of safety improvement, productivity increase ,and tact-time reduction through setting up the system about preventive maintenance. Actually, it is hard to establish and carry out preventive maintenance, even though we recognize the importance of the system concerning time, cost, labor, and so forth. In this study in the viewpoint of cost we are for achieving maximum efficiency by change and reduction of planning process adapted to the special work group. At first we briefly will mention the kind ,the necessity ,and the concept of preventive maintenance ,and then divide the equipment used in the assembly line into the two whether it is necessary or not by way of estimating the breakdown loss ,comparing with general establishment of preventive maintenance and modifying it to the case. At the second step we will establish the operation system of plan management related to production and quality in the special case. Check period and category will be set by dividing the assembly equipment into LCL and Focus in the third step. The forth step will contain the operation procedure in detail. And then we must make check and repair record periodically. Finally, on the basis of the record the selection of checking of significance will be conducted. This results in safety improvement, tact time reduction, and productivity improvement.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.131-141
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• 2004

This study deals with the procedure of safety improvement, productivity increase, and tact-time reduction through setting up the system about preventive maintenance. Actually, it is hard to establish and carry out preventive maintenance, even though we recognize the importance of the system concerning time, cost, labor, and so forth. In this study in the viewpoint of cost we are for achieving maximum efficiency by change and reduction of planning process adapted to the special work group. At first we briefly will mention the kind, the necessity, and the concept of preventive maintenance, and then divide the equipment used in the assembly line into the two whether it is necessary or not by way of estimating the breakdown loss, comparing with general establishment of preventive maintenance and modifying it to the case. At the second step we will establish the operation system of plan management related to production and quality in the special case. Check period and category will be set by dividing the assembly equipment into LCL and Focus in the third step. The forth step will contain the operation procedure in detail. And then we must make check and repair record periodically. Finally, on the basis of the record the selection of checking of significance will be conducted. This results in safety improvement, tact time reduction, and productivity improvement.

• Industrial Engineering and Management Systems
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• 제7권1호
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• pp.51-56
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• 2008

With growing demand for zero defects, predicting reliability of software systems is gaining importance. Software reliability models are used to estimate the reliability or the number of latent defects in a software product. Most reliability models to estimate the reliability of software in the literature are based on the development lifecycle stages. However, in the maintenance phase, the software needs to be corrected for errors and to be enhanced for the requests from users. These decrease the reliability of software. Software Reliability Growth Models (SRGMs) have been applied successfully to model software reliability in development phase. The software reliability in maintenance phase exhibits many types of systematic or irregular behaviors. These may include cyclic behavior as well as long-term evolutionary trends. The cyclic behavior may involve multiple periodicities and may be asymmetric in nature. In this paper, SGRM has been adapted to develop a reliability prediction model for the software in maintenance phase. The model is established using maintenance data from a commercial shop floor control system. The model is accepted to be used for resource planning and assuring the quality of the maintenance work to the user.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.856-863
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• 2009

The problem of urban decay in Hong Kong has drawn much attention of both practitioners and academics. Poorly managed buildings not just give a negative image to the Pearl of the Orient in the region, but also pose potential risk hazards to the health and safety of the general public. While it is necessary to devise a comprehensive plan on redevelopment and urban planning, preserving the existing buildings to maintain their conditions for habitation can be a short-term option to safeguard quality standard. With the increasing number of ageing buildings in Hong Kong, a lot of research efforts have been devoted to managing repair and maintenance projects properly (for example those initiated and funded by the Construction Industry Institute, Hong Kong; and the current study financially supported by The Hong Kong Polytechnic University). Given the short duration and more diversified nature of work, building repair and maintenance works are found to be more difficult to monitor and regulate when compared with new works. This paper aims to provide a comprehensive analysis on the problems of running building maintenance projects. An extensive review of contemporary literature was firstly conducted, which forms a solid basis for developing an empirical study on the problems and difficulties of running building maintenance projects from the viewpoints of industrial practitioners with a view to formulating effective strategies for managing maintenance projects successfully.