• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2003년도 춘계공동학술대회
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• pp.660-667
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• 2003

In this study, a Multiple Objective Mixed Integer Programming (MOMIP) Model is developed for sewer rehabilitation planning by considering cost, inflow/infiltration. A sewer rehabilitation planning model is required to decide the economic life of the sewer by considering trade-off between cost and inflow/infiltration. And it is required to find the optimal rehabilitation timing, according to the cost effectiveness of each sewer rehabilitation within the budget. To develop such a model, a multiple objective mixed integer programming model is formulated based on network flow optimization. The network is composed of state nodes and arcs. The state nodes represent the remaining life and the arcs represent the change of the state. The model consider multiple objectives which are cost minimization and minimization of inflow/infiltration. Using the multiple objective optimization, the trade-off between the cost and inflow/infiltration is presented to the planner so that a proper sewer rehabilitation plan can be selected.

• 산업융합연구
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• 제20권10호
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• pp.197-207
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• 2022

본 연구는 선천성 장애인의 재활서비스 비용에 영향을 미치는 요인을 파악함으로써 재활서비스 이용의 접근성을 높이기 위한 기초자료를 제공하는데 목적이 있다. 연구대상은 2020년 장애인실태조사 자료에서 선천성 장애인 712명이며, 자료분석은 SPSS WIN 26.0를 이용하여 위계적 다중회귀분석을 실시하였다. 연구결과는 19-40세, 중산층, 가구소득, 바우처 사용, 기관 서비스 만족도, 자폐성 장애유형이 재활서비스 비용에 영향을 미쳤으며, 이중 바우처 사용이 재활서비스 비용에 가장 큰 영향을 미쳤다. 따라서 선천성 장애인의 재활서비스 비용을 완화하기 위해 바우처 사업의 대상을 개선하고 전 생애에 걸친 재활서비스 지원체계 구축을 제안하였다.

• KEPCO Journal on Electric Power and Energy
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• 제3권2호
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• pp.119-125
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• 2017

Regarding the implementation of ROMM project (Rehabilitation, Operation, Maintenance & Management), which is one of overseas development projects, it is very important to diagnose the exact current status of aged thermal power plant. However, when people visit the power plant for the purpose of prediagnosis to implement the ROMM project, most target power plants for diagnosis, in general, are under operation. This can be a big interference factor to diagnose the exact current status of power plants. Therefore, in order to solve such interference factor, based on the 30 years of know-how in the field, the present study has developed a regression curve for a simple life time assessment and the calculation of rehabilitation cost that may be used as a reference relatively for the quantitative diagnosis on the status of a relevant power plant even during the operation of the power plant.

• 한방재활의학과학회지
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• 제24권1호
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• pp.65-76
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• 2014

Objectives The purpose of this study is to investigate the corelation between traffic accident severity and treatment period and cost by traffic accident. Methods Outpatients who visited Jaseng Korean medicine hospital traffic accident clinic were investigated by hospital computer system about period and cost of treatment. And we requested for repair cost of car, a sort of car groups and agreement date with car insurance company to insurance company. Therefore we could analysis statistical correlation of traffic accident severity (repair cost of car) with period of treatment, cost of treatment, number of treatment in same sort of car groups. For statistics, we used SPSS version 18.0 for windows. Results A significant positive correlation was found between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment in semi-midsize car, midsize car group. But, any significant correlation wasn't found between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment in small car, full-sized car group. In SUV (sport utility vehicle) car group some significant correlation was found, but it isn't between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment. Conclusions It was found that traffic accident severity (repair cost of car) had an effect on cost of car, cost of treatment and number of treatment by statistical analysis. But, it was also suggested strongly that other factors like a cost of car and ages had an effect on them.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.376-380
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• 2015

Life-Cycle Cost Analysis (LCCA) for highway projects is known as an effective analytical technique that uses economic principles to evaluate long-term alternative investment options, especially for comparing the values of alternative pavement design structures and construction strategies. In the Unites States, the 2012 Moving Ahead for Progress in the 21^st Century Act (MAP-21) amended the United States Code to mandate that the United States Government Accountability Office (GOA) conducts a study of the best practices for calculating life-cycle costs and benefits for the federally funded highway projects in 2013. The RealCost 2.5CA program was developed and adapted as an official LCCA tool to comply with regulatory requirements for California state highway projects in 2013. Utilization of this California-customized LCCA software helps Caltrans to achieve substantial economic benefits (agency cost and road user cost savings) for highway projects. Proper implementation of LCCA for roadway construction and rehabilitation would deliver noticeable savings of agency's roadway maintenance cost especially in developing counties where financial difficulties exist.

• 한국도로학회논문집
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• 제18권3호
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• pp.33-45
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• 2016

PURPOSES : Concrete pavement has been used in the construction of the Jungbu expressway in 1987. More than 60% of the pavement on the expressway is currently made of concrete, but most has been used far beyond their design life. Pavement life has been extended through routine maintenance or overlay. However, the structural capacity of the pavement has reached its limit, and extensive rehabilitation/reconstruction with long time traffic blocking should be considered. The three following issues on concrete rehabilitation/reconstruction will be discussed: (1) economic comparison of asphalt inlay and asphalt overlay, (2) economic comparison preventive overlay on a section which is currently good and routine overlay on the section which will be poor, and (3) economic analysis of early-strength concrete when it is used in concrete reconstruction. METHODS : First, various life cycle cost analysis tools were compared, and the proper tool for the extensive rehabilitation/reconstruction was selected. Second, a sensitivity analysis of the selected tool was performed to find the influential input variables, which should be carefully selected in the analysis. Third, three case studies, which can be issues in the rehabilitation/reconstruction of the expressway concrete pavement in Korea, were performed. RESULTS : Asphalt overlay without milling the deteriorated concrete showed 18~25% lower life cycle cost than the current asphalt inlay with milling. The good current preventive overlay on the section was economically justified within the scope of this study. The construction cost limit of the early strength concrete was suggested to be economical for 1, 3, and 7 days of construction alternative opening. CONCLUSIONS : CA4PRS was a viable tool for comparing various rehabilitation/reconstruction issue alternatives. Several concrete issues associated with the rehabilitation/reconstruction of the deteriorated concrete pavement were discussed as mentioned above.

• 한국수자원학회논문집
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• 제36권4호
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• pp.547-559
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• 2003

본 연구에서는 체계적이고 효율적인 하수관거 정비 계획 수립을 위하여 하수관거의 경제적 가치와 불명수 발생량 및 예산 제약 등을 고려한 최적화 모형을 개발 하였다. 하수관거의 최적 정비 계획 모형은 비용 및 환경오염을 일으키는 불명수 발생 사이의 상관관계를 적절히 판단하여 최적의 경제적 사용연수를 결정하여야 하며, 예산 제약 및 각 하수관거와 배수구역의 비용 대비 효과 등을 고려하여 최적의 정비 시점 및 방법을 결정하여야 한다. 이를 위하여 본 연구에서는 관거의 잔존 수명을 상태 노드로 표현하고, 정비에 따른 잔존 수명의 변화를 아크로 표현한 최소비용 네트워크 흐름 최적화(Network Flow Optimization)모형을 구성하였으며, 이를 기초로 예산 제약 및 하수관거 시스템의 정비 특성을 고려한 제약식을 추가한 다중 목적 혼합 정수계획법(Multiple Objective Mixed Integer Programming, MOMIP)을 수립하였다. 이때 모형의 목적식은 비용 최소화 목적과 함께 불명수 발생량 최소화 목적을 추가하여, 의사결정자에게 비용과 불명수 발생량 사이의 영향 관계를 보여줌으로써 적절한 하수관거 정비 계획을 선택할 수 있도록 하였다.

• Corrosion Science and Technology
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• 제3권2호
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• pp.72-80
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• 2004

Recently, the demand on the practical application of life-cycle cost effective design and rehabilitation of bridges is rapidly growing in civil engineering practice. However, in spite of impressive progress in the researches on the Life-Cycle Cost (LCC), the most researches have only focused on the theoretical point but did not fully incorporate the critical issues for the practical implementation. Thus, this paper is intended to suggest a systemic integrated approach to the practical application of various LCC methodologies for the design and rehabilitation of bridges, For that purpose, hierarchical definitions of LCC models are presented to categorize the approach of LCC assessment applicable for the practical implementation. And then, an integrated LCC system model is introduced with an emphasis on data uncertainty assessment and user-friendly knowledge-based database for its successful implementation. Finally, in order to demonstrate the LCC effectiveness for design and rehabilitation of real bridge structures, illustrative examples are discussed.

• 한국방재학회 논문집
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• 제9권4호
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• pp.45-51
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• 2009

본 논문에서는 예방적 유지보수 공법으로서 최소단면 보수공법의 경제성을 분석하였다. 최소단면 보수공법은 차량의 주행 특성을 근거로 하여 적용하였다. 최소단면 보수공법의 한 차로당 유효보수범위는 각 차륜 통과부인 70 cm이며, 주행차량 특성 분석에 따르면 각 차륜통과 범위 내에서 95%이상의 차량이 주행한다. 최소단면 보수공법은 기존의 유지보수공법보다 유지보수비용이 감소하는 것으로 나타났으며 교통정체 감소에 따른 사용자 비용도 감소한다. 본 연구결과 총 유지보수비용은 최소단면 보수공법을 적용함으로서 기존의 유지보수공법에 비해 35%감소하는 것으로 나타났다.

• 한국안전학회지
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• 제25권6호
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• pp.115-122
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• 2010

최근 들어 교량과 같은 구조물에 대한 생애주기비용(Life Cycle Cost, LCC) 분석의 중요성이 점차 커지고 있다. 그러나 교량의 공용수명 동안 발생할 수 있는 생애주기비용은 설계 및 시공조건 그리고 사용환경에 따라 많은 불확실성을 내포하고 있기 때문에 정확히 예측하기 힘들다. 본 논문에서는 교량의 생애주기비용 최적설계를 위한 설계방법을 제시하였다. 교량의 총생애주기비용은 초기비용, 손상비용 유지관리비용, 보수/보강비용, 사용자비용, 해제/폐기비용의 합으로 산정하였다. 생애주기비용을 목적함수로 하고 도로교설계기준을 제약조건으로 최적화를 수행하였다. 초기비용은 종합불가정보 및 참고자료를 근거로 산출하였으며, 하중 및 부재에 대한 불확실성을 고려하기 위해 손상확률의 개념을 도입하여 손상비용을 산출하였다. 교량의 내하율곡선을 이용하여 교량의 보수/보강 비용을 추정하였으며, 차량운행비용과 시간지연비용으로부터 사용자비용을 산정하였다. 이로부터 교량에 대한 생애주기비용 최적설계를 수행하고 주요인자들에 대한 영향을 살펴보았다.