• Title/Summary/Keyword: Prevent Maintenance

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Research directions for maintenance criteria in Slab Track (콘크리트궤도 유지보수기준 정립을 위한 연구방향)

  • Eom, Jong-Woo;Lee, Myung-Suk;Kwon, Jin-Soo;Kim, Soo-Jung
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.979-987
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    • 2011
  • The Ballast Track has been widely applied in traditionally due to low initial cost and abundant elastic property. But the disadvantages of Ballast track are; labor-intensive and costly maintenance, weak in high-speed and heavy axial load, in additionally need wide cross section of tunnel and massive substructure in viaduct. Therefore, recent applications tend to more and more towards slab track such as Gyeungbu high speed rail and existing line. The slab track increased the stability, resistance and durability of track, and save maintenance cost compare to the Ballast Track. But the slab track have weakness of track elongation by sub-ballast differential settlement and that threat safety of train operation. Therefor the slab track need to prevent cracks in concrete ballast for insure the durability of slab track. In this paper, review main items and its expected effects of the slab track maintenance standards that control sub-ballast settlement and concrete ballast cracks.

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Development of 3D Power Transformer Maintenance Application (3차원 그래픽을 이용한 전력용 변압기 유지보수 프로그램 개발)

  • Lee, Yil-Hwa;Park, Chang-Hyun;Jang, Gil-Soo;Cho, Kyung-Rae
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.114-116
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    • 2005
  • This paper presents a maintenance application for power transformer. High quality maintenance and accurate diagnosis are essential for all transformers, especially for older ones. The developed application provides maintenance guides for dry type transformer and oil-filled transformer to prevent any malfunctions and to lengthen the lifetime of transformers. Based on windows application, TTS (text to speech) and 3D graphics technologies have been used to enhance the user friendly interface. Developed application is helpful for both expert and novice operators at substation.

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Development of Information System for Maintenance of Urban Transit using Wireless LAN (무선랜을 이용한 전동차 유지보수 정보화시스템 구현에 대한 연구)

  • Ahn Tae-Ki;Park Ki-Jun;Lee Ho-Yong;Kim Gil Dong;Han Seok-Yun
    • Proceedings of the KSR Conference
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    • 2003.05a
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    • pp.542-547
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    • 2003
  • This paper proposes the method to develop information system for maintenance of urban transit using wireless LAM. Wireless LAN communication provides very useful method to maintain urban transit vehicle. We will use wireless LAN to transmit driving data, operational data and trace data from vehicle to wayside. And also we will use wireless LAN to refer various information concerning to work in real time. Proposed method may prevent loss of maintenance manpower and provide effective maintenance process.

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Aviation Operators' Response Plan to Overcome the Crisis in the Aviation Industry Caused by COVID-19 (COVID-19로 인한 항공 산업의 위기를 극복하기 위한 항공업계의 대응 방안)

  • Lim, In-kyu
    • Korean journal of aerospace and environmental medicine
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    • v.30 no.3
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    • pp.91-94
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    • 2020
  • The coronavirus infectious disease-19 (COVID-19) pandemic has had a profound impact on the aviation industry. In order to overcome this crisis, airlines have made their efforts in various fields. Therefore, we tried to summarize these efforts of airlines. It is also essential to keep aircraft that have been in landing for a long time in optimal condition. In this paper, we tried to find out about efforts to maintain landing aircraft and maintenance of personnel. Through such constant care, airlines will be able to quickly respond to increasing aviation demand when the infectious disease situation is stabilized in the future. Finally, airlines and passengers must make several efforts to ensure that passengers are free from COVID-19 while traveling by air. These include general precautions to prevent infection, separation of airline personnel and passengers, changes in seat assignments and in-flight services, periodic aircraft disinfection, and prevention of in-flight infections.

Safety for the Stable Electric Power Supply (안정적인 전력공급을 위한 안전)

  • Yoon, Jae-Kun
    • 한국연소학회:학술대회논문집
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    • 2012.11a
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    • pp.163-165
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    • 2012
  • Korea is now the country with shortage of electric power because of limits on power usage of businesses to prevent a possible blackout during the summer and winter. This is due to the failure to predict the total power usage. And the futhermore several accidents in the power plant during the overhaul maintenance threaten the stable power supply. Accidents were due to the combustion of low calorific coal and the shortage of the maintenance time. We should not incur a future great loss by pursuing a present small profit.

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Development of Failure Reporting Analysis and Corrective Action System

  • Hong, Yeon-Woong
    • 한국데이터정보과학회:학술대회논문집
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    • 2006.11a
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    • pp.97-112
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    • 2006
  • FRACAS(Failure Reporting, Analysis and Corrective Action System) is intended to provide management visibility and control for reliability and maintainability improvement of hardware and associated software by timely and disciplined utilization of failure and maintenance data to generate and implement effective corrective actions to prevent failure recurrence and to simplify or reduce the maintenance tasks. This process applies to acquisition for the design, development, fabrication, test, and operation or military systems, equipment, and associated computer programs. This paper shows the FRACAS development process and developed FRACAS system for a defense equipment.

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Development of a Diagnostic Module Based Maintenance Support Device for Fiber Optic Telecommunication Cable in Overhead Region (고소지역 작업현장에서 공중선 상태 진단 모듈 기반 정비 지원 장치 개발)

  • Kim, Hee-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.4
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    • pp.469-474
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    • 2014
  • Installed on telephone poles laid scrambling to monitor the status of the communication lines, and cost information can provid eadditional information tools to develop systems to support on-site monitoring. Aerial support for a maintenance monitoring module to apply an embedded system, and information processing applications manufactured. In this study, a comprehensive plan in accordance with the government's aerial maintenance work to prevent accidents spread support for the device to immediately take advantage of big cities and aerial maintenance business, Construction worker accused of bias and aims to improve efficiency of maintenance puts.

A Study on Estimating the Next Failure Time of LNG FPSO Compressor (해양플랜트 LNG FPSO 압축기의 신뢰성 및 회귀분석 기반 고장시점 추정 방법)

  • Cho, Sang-Jae;Jun, Hong-Bae;Shin, Jong-Ho;Choi, Sang-Deok
    • Korean Journal of Computational Design and Engineering
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    • v.19 no.3
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    • pp.203-213
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    • 2014
  • The O&M (Operation and Maintenance) phase of offshore plants with a long life cycle requires heavy charges and more efforts than the construction phase, and the occurrence of an accident of an offshore plant causes catastrophic damage. So previous studies have focused on design for reliability, and recently many studies have dealt with a maintenance system to prevent unexpected failures. Nowadays due to the emerging ICTs (Information Communication Technologies) and sensor technologies, it is possible to send health monitoring information of important equipment to administrator of an offshore plant in real time, which leads to having much concern on condition based maintenance policy or predictive maintenance. In this study, we have reviewed previous studies associated with condition-based maintenance of offshore plants, and introduced the approaches predicting failures of the compressor which is one of essential mechanical devices in LNG FPSO.

The Usefulness of Hard Time Task for Weapon System in Considering Shape Parameter of Weibull Life Time Distribution and Maintenance Cost (와이블 분포의 형상모수와 정비비용을 고려한 Hard Time 예방정비업무의 효용성에 관한 연구)

  • Kim, Mansoo;Ji, Woong Ki
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.274-283
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    • 2016
  • The study of maintenance planning is important in military weapon systems because it can improve their availability and reduce the operational and maintenance cost during the total life cycle. In maintenance planning, it is important to determine the preventive maintenance task and its optimal interval. This paper focuses on the hard time task, which is one of the preventive maintenance tasks. A hard time task removes an item or restorative action before some specified maximum age limit to prevent functional failure. The Monte-Carlo simulation model was proposed to help understand the cost effectiveness of a hard time task. In the simulation, various shape parameters of the Weibull distribution and cost ratio of corrective maintenance to preventive maintenance were assumed. Using a Monte-Carlo simulation, a quantified cost saving effect and optimal preventive maintenance interval were suggested.

The Management Method for Preventing Frequent Defect about Each Inspection Part from The Data Analysis of Pre-qualification of Residential Building Reconstruction (주택 재건축 예비평가 자료분석을 통한 분야별 주요결함 발생현황 및 유지관리방안 고찰)

  • Bae, Cheol-Hak;Lee, Sung-Ok;Ji, Myoung-Ho
    • Journal of the Korean housing association
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    • v.21 no.6
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    • pp.71-80
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    • 2010
  • The purpose of this study is to classify defects of the residential building by analyzing the defect specified by prequalification of residential building reconstruction and to suggest the solution of the problem which can be arisen during each stage of plan, construction and maintenance. By sorting the main defects which is specified by pre-qualification of residential building reconstruction for three years from August 2006 to August 2009 into 4 catagories and analyzing the cause of the defects, we draw the way of maintenance to prevent the defects and make pleasant residential environment. The reason for the frequent defects from residential building is mainly deterioration. It occured on the finishing more than on the structure, which means that residents can find defects easier on the finishing than the structure and clear the demand for repair. The result of analyzing of pre-qualification of residential building reconstruction is that the defects mostly caused small, masonry constructed and lower apartment. The apartment which is not into legal right for maintenance naturally have more defects than the others. In conclusion, it is necessary to establish a law of obligation duty of the maintenance of small apartment.