• Title/Summary/Keyword: Maintenance Cost Estimation Method

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Development of Defect-Repair Method-Cost Mapping Algorithm of Concrete Bridge Using BMS Data (BMS 데이터를 활용한 콘크리트 교량의 결함-공법-비용 매핑 알고리즘 개발)

  • Lee, Changjun;Park, Wonyoung;Cha, Yongwoon;Jang, Young-Hoon;Park, Taeil
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.43 no.2
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    • pp.267-275
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    • 2023
  • As aged infrastructures have been increased, the importance of accurate maintenance costs and proper budget allocation for infrastructure become prominent under limited resources. This study proposed a mapping algorithm between representative defects, repair methods, and the estimated maintenance costs for concrete bridges. In this regard, using BMS (Bridge Management System) data analysis, bridge repair methods were classified and matched with defects according to their locations, types, and sizes. In addition, the maintenance costs were estimated based on the amount of work-load and quantity per unit using CSPR (Cost Standard Production Rate). As a result, the level of accuracy was an average of 85.1 % compared with the actual bill of quantity for Seoul bridge maintenance. The accuracy of maintenance costs is expected to be enhanced by considering the various site conditions such as pier height, extra charge conditions, additional equipment, etc.

Application of FMECA with Stochastic Approach to Reliability-Centered Maintenance of Electric Power Plants in Korean Power Systems (RCM 수립을 위해 발전설비의 고장확률을 고려한 확률론적 FMECA 평가 기법)

  • Joo, Jae-Myung;Lee, Seung-Hyuk;Kim, Jin-O;Lee, Hyo-Sang
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.196-197
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    • 2006
  • Preventive maintenance can avail the generation utilities to reduce cost and gain more profit in a competitive supply-side power market. So, it is necessary to perform reliability analysis on the systems in which reliability is essential. In this paper, RCM (Reliability -Centered Maintenance) analytical method is adopted using real historical failure data in Korean power plants. Therefore, the reliability -based Probability model for predicting the failures of components in the power plant is also established, and application to FMECA(Failure Mode Effects and Critical Analysis) consideration of failure probability, Based on the weighting ranking of generating equipments which status to be probability estimation by FMECA. The FMECA is an engineering analysis and a core activity performed by reliability engineers to review the effects of probable failure modes of generating equipments and assemblies of the power system on system performance. The results of this paper show that application of FMECA with stochastic approach to the preventive maintenance can efficiently avail decreasing the cost on maintenance and hence improve the total benefit.

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A Study on the Estimation of Proper Construction Cost for Road Pavement Maintenance Work (아스팔트포장 유지보수 적정공사비 산정방안 연구)

  • Oh, JaeHun;Song, TaeSeok;An, BangYul
    • Korean Journal of Construction Engineering and Management
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    • v.21 no.6
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    • pp.16-26
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    • 2020
  • Road Pavement Maintenance Work is generated in a variety of different field conditions, and it is difficult to calculate the construction cost because there are no detailed criteria when preparing the estimated construction cost. Unlike new pavements, Road Pavement Maintenance has to be constructed with operating vehicles, and there are many differences in productivity depending on urban areas, limited work hours, night-time, construction area, etc. To compensate for this, the standard for calculation of construction cost provides additional charges for the number of lanes, residential areas, working hours, and night work, but it applied differently depending on construction officials. In this study, construction cost estimation standards that can properly reflect the conditions of the site was investigated for major types of Road Pavement Maintenance work. The site was investigated and analyzed mainly for many construction sites with 'overlay of asphalt after cutting', 'restore surface', 'repair of pavement', and 'recovery of roadway'. The criteria for the application of construction volume separately according to working hours, public places, and land area including extra charges for basic downtown and residential area. The hours of operation were divided into three types(7 hours, 5 hours, 3 hours) excluding movement and preparation time, and each type provided a coefficient for dividing the area of the construction site into five types. The construction cost calculation method based on the construction purpose is site conditions is proposed accordingly, and it is deemed that a plan for the designer to calculate the construction cost has been prepared in consideration of the site conditions.

Development of Pavement Management System for Highway Maintenance (국도유지관리를 위한 포장관리시스템 개발에 관한 연구)

  • Lee, Young-Wook;Do, Myung-Sik;Lee, Jong-Dal
    • International Journal of Highway Engineering
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    • v.9 no.4
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    • pp.159-169
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    • 2007
  • In this paper, a PMS(Pavement Management System) is presented for the public agency who wish to execute rational repair by referring to asset management information regarding road pavement. The aim of the paper is to provide the decision makers with the planning information regarding maintenance strategies for efficient road pavement management. We found that life cycle cost can be minimized and repair cost in each year fluctuates when repeating repair at the IRI management level. The validity of PMS application presented in this paper is investigated through case studies for conducted for 22 national highway road sections in Korea.

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Review on Advanced Health Monitoring Methods for Aero Gas Turbines using Model Based Methods and Artificial Intelligent Methods

  • Kong, Changduk
    • International Journal of Aeronautical and Space Sciences
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    • v.15 no.2
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    • pp.123-137
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    • 2014
  • The aviation gas turbine is composed of many expensive and highly precise parts and operated in high pressure and temperature gas. When breakdown or performance deterioration occurs due to the hostile environment and component degradation, it severely influences the aircraft operation. Recently to minimize this problem the third generation of predictive maintenance known as condition based maintenance has been developed. This method not only monitors the engine condition and diagnoses the engine faults but also gives proper maintenance advice. Therefore it can maximize the availability and minimize the maintenance cost. The advanced gas turbine health monitoring method is classified into model based diagnosis (such as observers, parity equations, parameter estimation and Gas Path Analysis (GPA)) and soft computing diagnosis (such as expert system, fuzzy logic, Neural Networks (NNs) and Genetic Algorithms (GA)). The overview shows an introduction, advantages, and disadvantages of each advanced engine health monitoring method. In addition, some practical gas turbine health monitoring application examples using the GPA methods and the artificial intelligent methods including fuzzy logic, NNs and GA developed by the author are presented.

A Study of on the Case Study of LCC Analysis for the Education and Research Building of S University (S대학교 교육연구동 LCC분석 사례 연구)

  • Seo Min-Gu;Ha Han-Ki;Park Tae-Keun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.329-332
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    • 2003
  • The Ministry of Construction and Transportation has estimated the reconsideration of economy in construction and the dullness of LCC forcast method which supports decision-marking in safety and maintenance of buildings. So, they have introduced LCC analysis method in steps of a feasibility study and design. Because of the introduction of LCC analysis process and method, it would be possible to make a logical decision from management maintenance, estimation, user point of view. In this study, it would bepossible to show a plan and alternative of design factors and structure in one building by using LCC analysis method and to compare and analyze the reduction of life circle cost bi the elapsed time.

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The study on configuration method for the vehicle-based train position detection (차상기반 열차위치검지방식의 구성방안 연구)

  • Shin, Kyung-Ho;Jung, Eui-Jin;Kim, Jong-Ki
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.238-240
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    • 2006
  • For the method of train position detection, ground-based train position estimation mainly has been applied so far. Ground-based position detection is the way to detect train current positions by installing train position equipments on railroad lines. However, the ground-based methods should install detection equipments on each section, and can only be able to detect train positions from main command center. So this method has several disadvantages such as an discontinuous position detection, an increment in cost of installation and maintenance. To make possible continuous train position detection, and to minimize amount of the cost, the vehicle-based position detection method should be chosen to determine train positions by loading position equipments on vehicles. In this paper, to realize the vehicle-based train position detection method, configuration scheme of train position detection equipment is suggested by using GPS, inertial sensor, speed sensor and its performance is verified by simulations.

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Life Cycle Cost Estimation of Cleaning Robot for External Windows (유리창 외부 청소용 로봇의 생애주기비용 예측)

  • Kim, Kyoon-Tai;Jun, Young-Hun;Kim, Jeoung-Tae;Park, Kyeong-Ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.272-273
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    • 2017
  • As businesses put a greater emphasis on outward appearances, the demand for external window cleaning has been on the rise. However, with the conventional labor-intensive window cleaning method, it is hard to meet this demand. Therefore, this study proposes a Life Cycle Cost (LCC) analysis model for a guiderail-type cleaning robot, and estimate the LCCs of the conventional method and the cleaning robot. The findings of this research are expected to serve as a guide for future development of a cleaning robot.

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A Study on the Investment Strategy that improves the Rail-infrastructure Investment Efficiency (철도투자 효율성 향상을 위한 투자전략에 관한 연구)

  • Kim, Seong;Lee, Jong-Gug;Kim, Yoon-Yang
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1574-1586
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    • 2008
  • Railway is the most effective transportation than any other traffic. But due to the its expensive maintenance fee and various components like roadbed, rail, rollingstock, electric and signal etc, the construction cost of the railway is usually higher than highway. Such a reason, a lot of cost and period are needed to complete the railway project. In addition that considering the decreasing of the SOC budget, the investment in the railway industry is getting hard than ever. This study analyzed the cost, term of work, freight & passenger transportation demand of the wide area railway electrification project and main line improvement project. And it compared the estimation value and real value of the projects like cost and period etc. And this study surveyed the economic feasibility including factors which are not considered in the feasibility study guide. With those results, This study suggest the project management and evaluation method to enlarge the efficiency of the railway construction project.

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A Study on the Prediction of Weapon System Availability Using Agent Based Modeling and simulation (에이전트 기반 모델링 및 시뮬레이션을 이용한 무기체계 가용도 예측에 관한 연구)

  • Lee, Se-Hoon;Choi, Myoung-Jin
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.17 no.1
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    • pp.25-34
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    • 2021
  • Availability is one of the important factor for developing weapon system, because it indicates the mission capability and sustainable life cycle management of weapon system. Recently, as weapon system becomes more advanced and more complex, availability estimation becomes more important to reduce the life cycle cost of weapon system. Modeling and simulation(M&S) is useful method to describe the availability of complex weapon system applying operational environment and maintenance plan. Especially agent based model(ABM) has the strength to describe interactions between agents and environments in complex system. Therefore, this paper presents the availability estimation of weapon system using agent based model. The sample data of part list and reliability analysis is applied to build availability estimation model. User agent and mechanic agent are developed to illustrate the behavior of operation and maintenance using formal specification. Storage reliability is applied to describe failure of each parts. The experimental result shows that this model is quite useful to estimate availability of weapon system. This model may estimate more reasonable availability, if full scale data of weapon system and real field data of operation is provided.