• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.960-968
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• 2005

The high cost in maintaining complex manufacturing process makes it necessary to enhance an efficient maintenance system. For the effective maintenance of manufacturing process, precise fault diagnosis should be performed and an appropriate maintenance action should be executed. This paper suggests an intelligent fault diagnosis system using hybrid data mining. In this system, the rules for the fault diagnosis are generated by hybrid decision tree/genetic algorithm and the most effective maintenance action is selected by decision network and AHP. To verify the proposed intelligent fault diagnosis system, we compared the accuracy of the hybrid decision tree/genetic algorithm with one of the general decision tree learning algorithm(C4.5) by data collected from a coil-spring manufacturing process.

• 품질경영학회지
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• 제51권2호
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• pp.315-327
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• 2023

Purpose: Recently, research has continued to predict the time of failure of the facility through measurement data obtained by attaching a sensor to the facility. However, depending on the facility, it may be difficult to attach a sensor. The purpose of this study is to propose a power generation maintenance plan system based on failure record data obtained from Continuous Ship Unloader, one of the facilities that is difficult to attach sensors. Methods: This study uses data collected from 2012 to 2022 from the 'CSU-1B' model among Continuous Ship Unloader operated by Korea Midland Power Co., LTD. By fitting fault record data to the Weibull distribution, appropriate maintenance cycles and ranges for each target facility subsystem are derived. In addition, maintenance group between subsystems is selected through Euclidean distance, a metric often used for time series data similarity. Through this, a system for establishing an maintenance plan for power generation facilities is proposed. Results: The results of this study are as follows. For the 17 subsystems of the Continuous Ship Unloader, proper maintenance cycles and ranges were determined, and a total of four maintenance groups were chosen. This resulted in the creation of an power generation maintenance plan system and the establishment of an maintenance plan. Conclusion: This study is a case study of power generation facilities. We proposed a maintenance plan system for Continuous Ship Unloader among power generation facilities.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1612-1617
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• 2011

Rolling stock needs many maintenance works because of its long service life. The maintenance of rolling stock has periodic preventive maintenance system. This periodic preventive maintenance system can't reflect the characteristics of every part. The condition-based maintenance system which reflects the functional condition of every part prevents breakdown and reduces maintenance cost. This study will analyze the records of every part by unreasonable examples of time-based preventive maintenance and reliability management activities, and discuss the necessity of maintenance system reflected the results.

• 한국건설관리학회논문집
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• 제22권4호
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• pp.41-49
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• 2021

국내의 유지관리 전략이 안정성 중심에서 성능중심으로 변화하고 있고, 그 기준에 맞추어 관련 제도와 법이 정비되고 있다. 성능평가에 기반한 자산관리를 도입하기 위해서는 구조물의 특성에 맞추어 성능을 평가할 수 있는 성능척도, 서비스수준 설정 등 관련 평가방법이 구체화하여야 하나 국내에서는 이러한 것들이 아직 구체화하지 못하고 있다. 본 연구에서는 기존의 유지관리 절차와 연계해서 성능평가, 생애주기 비용분석, 성능척도, 서비스수준 등 자산관리를 하기 위한 전산화 모델을 제시한다. 자산관리 모델을 수립하기 위해 유지관리 및 안전진단 등에 필요한 매뉴얼, 업무절차, 전문가의 인터뷰 등을 실시하고 자료를 분석하였다. 본 시스템은 3개 모듈로 구성하여 기존의 유지관리, 안전관리, 자산관리를 별개로 운영할 수 있도록 하였다. 본 시스템은 향후 자산관리를 도입하기 위한 공공기관의 참고자료로 활용될 수 있도록 구성하였다.

• 품질경영학회지
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• 제25권3호
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• pp.86-95
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• 1997

This paper considers a repairable system, which is maintained preventively at periodic times and is minimally repaired at each failure. Most preventive maintenance policies for such repairable systems assume that the cost of minimal repair is constant regardless of its age at failure. However, it is more practical to consider the situations where the cost of minimal repair is dependent not only on its age at failue, but also on the number of preventive maintenance carried out prior to its failure. We consider the preventive maintenance carried out prior to its failure. We consider the preventive maintenance policy with age-dependent minimal repair cost. The optimal policies which minimize the expected cost rate over an infinite time span are discussed. We obtain the optimal period and number of preventive maintenance prior to replacement of the system.

• 품질경영학회지
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• 제35권4호
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• pp.140-146
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• 2007

In this paper, we consider a periodic imperfect preventive maintenance(PM) policy in which the system's failure rate after each PM remains unchanged. The system undergoes only minimal repairs at failures between PMs. Exact mathematical formula of the expected cost rate per unit time is derived. Optimal number of PMs and optimal maintenance period are derived by minimizing the expected cost rate per unit time. A numerical example is provided to illustrate the proposed approach under Weibull lifetime distribution.

• 자동차안전학회지
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• 제13권3호
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• pp.26-31
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• 2021

Although the number of domestic electric vehicle registrations exceeded 100,000 in the first half of 2020, legal and institutional concerns for maintenance and management are insufficient. In particular, the existing automobile maintenance business and qualification holders are not prohibited from performing electric vehicle maintenance without additional qualifications or training under the current laws. In this study, we review the current status of Korean laws and regulations, examine discussions abroad such as the UK, the US, and Germany, and then discuss desirable laws and institutional reform. This study proposes to temporarily reorganize the system in a way that separates the electric vehicle maintenance business and the electric vehicle maintenance qualifications from conventional vehicle.

• 대한안전경영과학회지
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• 제9권4호
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• pp.1-9
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• 2007

The Korean government had enacted 'Special Regulation on the Safe Maintenance of Facilities' and carried out regular safety inspections since the mid-1990s, consequently establishing and enforcing an effective maintenance and management system. And throughout this entire process, the government searched for new methods to increase the overall effectiveness of the system. Nevertheless, the reality is that our society remains structurally unprepared to implement a commercial mindset that views the concept of "safety" as a product that can be traded in the open market based on supply and demand. Therefore, the government should establish mid to long-term plans to implement such a system in successive stages.

• 대한안전경영과학회지
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• 제2권4호
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• pp.1-8
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• 2000

Equipment and machine of industrial plant are give effect to mechanical-stress of many working-stop or long time operating. Therefore, to be old and decrepit of every king of equipment. As long time operating equipment period into increase conservation and of repair equipment time is efficacious necessity of utility factor gradually that of productivity of diminution and complete equipment expense of increase. Conservation at special skill working and necessity is that will effectually and complete a period prevention management diagnosis can conservation point at issues at in advance.

• 한국기록관리학회지
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• 제22권2호
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• pp.135-154
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• 2022

이 연구는 자치단체 RMS 유지관리 현황 분석을 통해 RMS 운영성 확보를 위한 방안을 제안하는 데 목적이 있다. 이를 위해 RMS 개발 및 유지관리 사업 제안요청서 분석, RMS 업무담당자 및 사업자 인터뷰 수행 등을 통해 자치단체 RMS 유지관리 현황을 확인하였다. 자치단체 RMS 유지관리 현황은 RMS 응용SW 버전관리를 위한 운영지원이 체계적이지 않으며, 인프라(HW, 상용SW)는 기술지원 종료된 장비의 교체가 잘 이루어지지 않고 있는 상황이다. 본 연구를 통해 자치단체 RMS 운영성 확보를 위한 방안을 다음과 같이 제안하였다. 첫째, 자치단체 RMS 안정적인 운영과 유지관리를 위해 운영지원 상시화로 무중단 체계 구축이 필요하다. 이를 위해, RMS 운영지원 요청사항에 대해 즉시 처리할 수 있는 전문인력 조직과 원격접근 가능한 환경구성 마련이 요구된다. 둘째, RMS 통합유지관리 체제 구축을 통한 일정 수준 이상의 유지관리 품질을 확보해야 한다. 현재 이원화 되어 운영 중인 RMS 응용SW 유지관리와 RMS 운영지원 업무를 통합 유지관리하여 정보화사업을 효율적으로 추진하고, RMS 유지관리 사업단 운영을 통해 품질 높은 운영지원을 수행해야 할 것이다. 셋째, RMS 인프라 호환성 목록을 체계적으로 관리하여 자치단체 RMS 인프라 유지관리를 위한 명확한 기준을 제공해야 한다.