• Title/Summary/Keyword: RCM

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A Study on the Application of RCM(Reliability Centered Maintenance) to KTX(Korea Train express) (고속철도차량(KTX) RCM 적용에 관한 연구)

  • Lim Byeong-Ok;Yoon Deok-Gyun
    • Journal of the Korean Society for Railway
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    • v.8 no.5
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    • pp.470-476
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    • 2005
  • RCM developed by American air industry in early 1960, its process is most realistic for some physical assets and it permits the system to maintain given function status through decision of demand about optimum maintenance. Therefore, many industries have selected RCM technique and have carried out RCM in order to solve many problems concerning maintenance management as improvement of reliability and availability of facilities, removal of hazard element about break down and retrenchment of maintenance cost. Through the execution of RCM, we can solve actual problems. And finally we will be able to develop more and more maintenance activities with RCM notion. In this study, we will consider the application of KTX-RCM which is set up with basic theory of RCM and constructed to improve vehicle safety, availability and regularity of KTX, linking with CMMS(Computerized Maintenance Management System).

The research for organizational system with effective RCM analysis (효과적인 RCM분석을 위한 조직체계에 관한 연구)

  • Kim, Min-Ho;Song, Kee-Tae;Baek, Young-Gu;Lee, Key-Seo
    • Proceedings of the KSR Conference
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    • pp.2125-2129
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    • 2008
  • In present, RCM has been hot issue in the domestic railway industry areas. Based on this circumstance, in this paper, for the purpose of an effective RCM system construction, a suitable organization structures which are to be applied to the railway system is proposed. Some examples and descriptions about the responsibilities and the roles which should be done by each RCM team, during the RCM analysis, as step by step for RCM analysis are also described. By using the formalized organization, the tasks for maintenance are allocated to each staff and the data for RCM analysis could be managed, systematically, as well. To sum up, it would be expected that based on the systematic organization structure for RCM analysis, the results of RCM analysis, that mean the maintenance methods and intervals for preventive maintenance, on specific railway system could be more reliable and accurate.

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Physicochemical Properties of Raspberry Wine using Active Dry Yeast Strains (활성건조효모를 이용한 복분자주의 이화학적 특성)

  • Moon Young-Ja;Lee Myung-Soon;Sung Chang-Keun
    • The Korean Journal of Food And Nutrition
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    • v.18 no.4
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    • pp.302-308
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    • 2005
  • To examine the difference in each ingredient between the yeast strain and two raspberry kinds (Rubus crataegifolius Bunge(RCB), Rubus coreanus Miquel(RCM)) in the making of raspberry wine, five active dry yeasts were selected. Regarding the RCM ethanol content, the raspberry wine fermented by Lalvin Wl5 was the highest, while those fermented by Prise de Mousse were the lowest. The pH of the RCM was $3.58\~3.63$, and Montrachet was the highest one of total acidity. In the case of nonflavonoid phenols, the RCM fermented by Montrachet was the highest one, and in the case of flavonoid phenol and total phenol, the RCM fermented by Epernay II was the highest. The content of organic acid in RCM were highest in the following order: citric acid > oxalic acid > malic acid, and tartaric acid was not detected at all. The average content of malic acid in RCM after malolactic fermentation was reduced by almost $65.5\%$, and the RCM fermented by Prise de Mousse, after malolactic fermentation, was $73.3\%$. This latter was the highest, while the RCM fermented by Epernay II was the lowest, at $59.1\%$.

A Study on the Effective RCM Application of Railway Vehicle (철도차량의 효과적 RCM 적용을 위한 연구)

  • Kim, Jong-Gurl;Kim, Hyung-Man;Song, Jung-Moo
    • Proceedings of the Safety Management and Science Conference
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    • pp.573-585
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    • 2010
  • 최근 철도차량은 안전성과 신뢰성 향상을 위해 점차 복잡하게 설계 제작되고, 품질에 대한 기대와 요구수준이 점차 높아짐에 따라 운영기관에서는 과학적이고 체계적인 예방 정비를 통한 안전성과 가용성 향상을 위해 노력하고 있다. 이러한 목적을 달성하기 위하여 여러 방안들이 연구되고 있으며, 대표적으로 신뢰성 기반 유지보수(RCM; Reliability Centered Maintenance)가 철도분야에 지속적으로 도입되고 있는 추세이다. 본 연구에서는 새로운 예방정비 기술로 대두되고 있는 RCM의 기본이론에 대한 고찰과 RCM의 일반적 실시 절차를 소개하고, RCM의 국제규격인 IEC 60300-3-11, NAVAIR 00-25-403, MIL-STD-2173을 비교 분석하여 이를 바탕으로 철도차량에 RCM 도입 시 효과적이고 적합한 절차 및 방안을 제시하고자 한다.

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A Study on RCM Approach to Catenary System of Electric Railway (전기철도 가공전차선로의 신뢰성 기반 유지보수(RCM)에 관한 연구)

  • Youn, Eung-Kyu;Choi, Kyu-Hyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.8
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    • pp.1457-1465
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    • 2016
  • A RCM approach to maintenance of the catenary system of electric railway is proposed. The proposed RCM approach provides a maintenance-oriented FMECA procedure to derive critical failure modes by analyzing failure effects and a RCM decision logic tree to suggest optimal maintenance works for the derived failure modes. By applying the proposed RCM procedures to the catenary system of high speed railway, it is suggested that strand breaks of dropper and voltage equalizing wire, and trolly wire wear-out are the critical failure modes for whom maintenance works based on condition monitoring should be applied instead of conventional time-based preventive maintenance. It is also proposed by reliability analysis that replacement time of dropper can be reduced from 18 years to 10 years. These results show that the proposed RCM approach can optimize the maintenance procedures of catenary system.

고속철도차량(KTX)의 RCM적용에 관한 연구

  • Lim Byeong-Ok
    • Proceedings of the KSR Conference
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    • pp.326-331
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    • 2005
  • RCM developed by American air industry in early 1960, its process is most realistic for some physical assets and it permits the system to maintain given function status through decision of demand about optimum maintenance. Therefore, many industries have selected RCM technique and have carried out RCM in order to solve many problems concerning maintenance management. Through the execution of RCM, we can solve actual problems And finally we will be able to develop more and more maintenance activities with RCM notion. In this study, we will consider the application of KTX-RCM which is set up with basic theory of RCM and constructed to improve trainset safety, availability and regularity of KTX, linking with CMMS(Computerized Maintenance Management System).

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Immunogenecity of Low Molecular Weight Immunogens in Laying Hens (닭에서 저급 분자량 항원의 면역원성)

  • Lee, Kyong-Ae
    • Korean Journal of Human Ecology
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    • v.5 no.1
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    • pp.75-80
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    • 1996
  • The immunogenecity of low molecular weight ($MW{\le}30,000$) immunogens in laying hens was investigated. Immunogens were insulin derivatives and ${\beta}$-lactoglobulin(${\beta}-Lg$). Insulin derivatives were reduced- carboxymethylated(RCM) insulin, and RCM-A and RCM-B chain of insulin. The yolk antibodies against RCM-A chain of insulin appeared after the first immunization. The yolk antibodies against RCM-B chain of insulin were elicited 5 weeks after the third booster injection. Although the anti-RCM-B chain yolk antibodies recognized native insulin, the anti-RCM-A chain yolk antibodies didn't native insulin. The anti-RCM insulin yolk antibodies were induced after the second booster injection and showed cross-reactivities with native insulin. On the other hand, ${\beta}-Lg$ showed stronger immunogenecity than insulin derivatives. The $anti-{\beta}-Lg$ yolk antibodies were produced after the second booster injection and the peak titer was reached 3 weeks after the third booster injection.

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A Case Study on the Application of RCM to Railway System (철도분야 최적유지보수(RCM) 시스템 구축에 관한 연구)

  • Han, Kee-Youl
    • Journal of Applied Reliability
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    • v.15 no.4
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    • pp.276-281
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    • 2015
  • Purpose : The purpose of this study is to propose that domestic rail must the work to be done in the RCM system and railway operators are to present a direction to establish the efficient and systematic system based on this. Methods : In recent years, domestic railway accidents has decreased year rapidly every year. In particular, suicidal ideation was greater than 50% of the accidents is showing a larger decrease in the influence of the screen-door construction. However, the train delay has been maintained without major changes since 2010. The most important cause of the delay operation is a vehicle breakdown. This fact demonstrates that effective maintenance of the most important activities in the railway accident prevention activities. So we have to build a RCM system in which the characteristics of the domestic railway accident. Conclusion : We proposed what is necessary functionality and the function requires a railway operators in RCM railway systeml.

A Study on Reliability Centered Maintenance of AGT Vehicle System (고무차륜 AGT 차량의 신뢰성 중심 유지보수(RCM)에 관한 연구)

  • 한석윤;하천수;이한민
    • Journal of the Korean Society for Railway
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    • v.7 no.3
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    • pp.271-277
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    • 2004
  • This paper is concerned with the reliability centered maintenance (RCM) of the Automated Guideway Transit (AGT) vehicle system. Korea Railroad Research Institute (KRRI) has developed the AGT vehicle system from 1999 to 2004. The provisions for a specific maintenance system including RAMS (reliability, availability, maintainability & safety) of AGT vehicle system is necessary for maintaining good operation conditions. RCM is a process used to determine what must be done to ensure that any system continues to do whatever its users want it to do in its present operating conditions. Therefore, we introduce RCM in details and describe how RCM should be applied to AGT vehicle system on Gyeong-San test line. Analyses to approach RCM to AGT vehicle system are demonstrated in the seven steps that contain each main task and detailed operating conditions.

Effects of Rubus Coreanus Miquel on the Apoptosis of U937 Cells (복분자가 U937세포의 apoptosis에 미치는 효과)

  • Lee, Kwang-Kyu;Han, Jong-Hyun;Oh, Chan-Ho
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.23 no.6
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    • pp.1404-1408
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    • 2009
  • Methanol extracts of Rubus Coreanus Miquel (RCM) were found to exhibit apoptosis induction of U937 human histiocytic leukemia cells. Treatment of RCM exerted strong cytotoxicity against U937 human leukemia cells. RCM induced apoptosis of U937 leukemia cells in a dose dependent manner. Nitric oxide (NO) production was increased in RCM-treated RAW264.7 macrophage cell line. RCM increased the p53 and $NF{\kappa}B$ gene and decreased the $I{\kappa}B$ gene expression in U937 cells. RCM also increased the $NF{\kappa}B$ protein expression, but decreased the PCNA and BcL-xL protein expression in cultured U937 cells. These data suggest that RCM are effective on the apoptosis induction of human leukemia cells and anti-cancer properties.