• Title, Summary, Keyword: RCM

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The Application of RCM in Traction Power System (철도집전전력시스템의 RCM 적용)

  • Kim, Hyung-Chul;Cha, Jun-Min;Kim, Jin-O
    • Proceedings of the KIEE Conference
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    • pp.202-204
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    • 2008
  • RCM(reliability Centered Maintenance) 적용 시 나타나는 장점으로 인해 이미 여러 산업 분야에 적용되고 있다. 설비의 안정성을 중요시하는 원자력발전 부문에서 처음으로 도입 후 전력산업분야 대부분에서 RCM을 적용하거나 적용연구가 진행되고 있다. 철도산업에서도 전력산업 분야와 같이 안정적 이면서 경제적인 전력을 공급하는 것이 중요하므로 정비업무의 중요성이 크다고 할 수 있다. 특히 철도 시스템 중 한전에서 154kV나 345kV를 수전 받아 철도 시스템에 전력을 공급하는 변전소의 역할은 매우 중요하다. 따라서 철도 변전소를 구성하고 있는 설비의 특성과 운영방식에 대한 연구를 통해 적절한 RCM적용 방안을 위한 고장모드 및 임계분석 (FMECA: Failure Mode, Effects and Criticality Analysis) 연구의 필요성이 대두된다. RCM과 FMECA는 적용 산업분야에 따라 적용 절차를 다르게 적용되어진다. 따라서 철도 변전소에 대한 고장데이터와 설비들의 특성 및 현재 운용방식 등을 종합적으로 고려하여 적절한 수립방법 연구가 필요하다.

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Development and Application of RCM Process for the Optimized Maintenance of Railway Vehicle (철도차량의 유지관리 최적화를 위한 RCM 프로세스 개발 및 적용)

  • Shin, Kun Young;Lee, Hi Sung
    • Journal of Energy Engineering
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    • v.24 no.1
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    • pp.10-16
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    • 2015
  • Recently, RCM(reliability centered maintenance) process is introduced and applied for the planning and implementing efficient and effective maintenance system in terms of optimal rolling stock maintenance. Particularly, cost-time benefits analysis associated with the implementation of RCM for rolling stock maintenance is necessary and required for railway operator in advance. The RCM process was primarily starting from military, airplane and nuclear industries and is now adapted in railway industry for local railway operators. This paper focuses on suggesting the way of connecting the RCM process with railway maintenance activities in the railway operation field. Thus, in order to introduce and establish reliability activities, it needs to review and evaluate the maintenance environment in the organizational point of view. Based on these reviews and evaluations, various maintenance methodologies are reviewed for customizing local railway field situations and establish specific process in the application of major systems on the reliability technology. In this paper, the railway RCM process is proposed for the establishment and construction of the systematic and optimal maintenance system.

Hepatoprotective effects of Rubus coreanus miquel concentrates on liver injuries induced by carbon tetrachloride in rats

  • Chae, Hyun-Jung;Yim, Jung-Eun;Kim, Kyung-Ah;Chyun, Jong-Hee
    • Nutrition Research and Practice
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    • v.8 no.1
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    • pp.40-45
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    • 2014
  • As well-being foods pursuing healthy life are becoming popular, interest in Rubus coreanus Miquel (RCM) fruit, a type of Korean blackberry, is increasing due to its medicinal actions including protecting the liver, brightening the eyes, and alleviating diabetes. This study was carried out to evaluate the hepatoprotective effects of RCM concentrates on liver injuries induced by carbon tetrachloride ($CCl_4$) in rats. RCM, produced in June ~ July 2008 at Chunbook, Gochang (South Korea), was finely mashed. The seeds were removed and the juices were condensed. Thirty-two Sprague-Dawley rats were divided into four groups according to treatment: normal (eight rats), $CCl_4$, 1% RCM, and 2% RCM. Experimental diets were provided to the experimental animals for 4 weeks. We measure total cholesterol, high density lipoprotein-cholesterol (HDL-C), aspartate amino transferase (AST), alanine amino transferase (ALT), and alkaline phosphatase (ALP) levels. Part of the livers was isolated for histopathological evaluation, and analyzed for lipid peroxide (TBARS), superoxide dismutase (SOD) and liver proteins. The activities of serum AST, ALT, and ALP were elevated following $CCl_4$ administration. Levels of hepatic TBARS were also significantly increased in the $CCl_4$ groups. However, hepatic TBARS levels and the activities of serum enzymes were markedly reduced by supplementation with the RCM concentrates (P < 0.05). Hepatic SOD activity increased in the RCM concentrates group versus $CCl_4$ groups. Histopathological examination revealed massive necrosis in the centrilobular area and degenerative changes caused by $CCl_4$ were ameliorated by dietary supplementation with RCM concentrates. These results suggest that RCM concentrates have hepatoprotective effects and may improve the symptoms of liver injuries.

Beneficial Effect of Rubus Coreanus Miq in a Rat Model of High Fructose Diet-induced Metabolic Syndrome (고과당식이 랫드모델에서 복분자 투여에 의한 대사증후군 개선효과)

  • Kho, Min Chul;Lee, Yun Jung;Yoon, Jung Joo;Kang, Dae Gill;Lee, Ho Sub
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.29 no.1
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    • pp.11-17
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    • 2015
  • Overconsumption of fructose results in dyslipidemia, hypertension, which have documented as a risk of cardiovascular diseases. This experimental study was designed to investigate the beneficial effects of Rubus coreanus Miq.(RCM) in high-fructose diet-induced metabolic syndrome. Animals were divided into three groups; Control group fed regular diet and tap water, fructose groups were fed the 65% high-fructose (HF) diet with/without RCM 100 mg/kg/day for 8 weeks, respectively. Chronic treatment with RCM significantly decreased body weight, fat weight and adipocyte size. Moreover, RCM significantly prevented the development of the metabolic disturbances such as hyperlipidemia and hypertension. RCM also led to increase in high density lipoprotein level in the HF group. In addition, RCM suppressed vascular cell adhesion molecule-1 (VCAM-1) expression and significantly recovered the levels of endothelial nitric oxide synthase (eNOS) expression in aorta. These results demonstrates that RCM may be a beneficial therapeutic for metabolic syndrome through the improvement of hyperlipidemia, obesity, and hypertension.

A Comparison Between TPM and RCM on the Maintenance Planning (TPM과 RCM에서의 보전계획 비교)

  • 김정식;장중순
    • Journal of the Korean Society for Quality Management
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    • v.25 no.1
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    • pp.31-43
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    • 1997
  • In this study, the pros and cons of TPM and RCM were comparatively evaluated at various aspects : a, pp.ication process, objectives, maintenance items, organizations, analysis of maintenace methods, etc. It is found that TPM can be considered as a management discipline. However, in TPM, there seldom exist concrete rules or guidelines to select a maintenance scheme. RCM, which is a widely used maintenance scheme for aircrafts or power plants, has a good analysis and decision logic for maintenance planning. In the paper, similar decision rules are adopted to TPM deployment to get an effective and effecient maintenance Planning.

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Contents of Amino Acids in Raspberry Wine Using Active Dry Yeast Strains (활성 건조 효모를 이용한 복분자주의 아미노산 함량)

  • Moon, Young-Ja;Lee, Myung-Soon;Sung, Chang-Keun
    • The Korean Journal of Food And Nutrition
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    • v.19 no.4
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    • pp.392-397
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    • 2006
  • To compare the contents of amino acids in raspberry wine, 5 types of active dry yeast strains (Saccharomyces cerevisiae Montrachet (UCD #522), Saccharomyces bayanus Pasteur Champagne (UCD #595), Saccharomyces cerevisiae Epemay II (CEG), Saccharomyces bayanus Prise do Mousse (PM), Saccharomyces uvarum Latvia W15) were used. In the fermentation experiment two kinds of raspberry wine were used; Rubus coreanus Miquel(RCM), harvested in Gochang, and Rubus crataegifolius Bunge(RCB), harvested in Okcheon. In 5 kinds of RCM raspberry wines, total contents of 17 amino acids were found from $16.77mg/{\ell}$ in the fermented Prise de Mousse, the most amount, to $12.29mg/{\ell}$ in Lalvin W15, the lowest. The content of amino acid in the RCB raspberry wine fermented by Montrachet was approximately 5.5 times higher than that of the RCM raspberry wine; $90.55mg/{\ell}\;to\;16.54mg/{\ell}$. Cystine and isoleucine were detected $2.97mg/{\ell},\;0.34mg/{\ell}$, respectively, in the RCB raspberry wine but not detected in the RCM raspberry wine. The amount of alanine, aspartic acid, and serine in RCB raspberry wine were found approximately 14 to 20 times larger than that of RCM raspberry wine.

Development of RCM Framework for Implementation on Safety Systems of Nuclear Power Plant

  • Kim, Tae-Woon;Brijendra Singh;Park, Chang K.;Chang, Tae-Whee;Song, Jin-Bae
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.631-636
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    • 1996
  • This paper presents a Reliability Centered Maintenance (RCM) framework for implementation on safety system of nuclear power plant (NPP). RCM is a systematic methodology to optimize the surveillance and maintenance tasks for critical components which provides efficiently and effectively reliability of system and safety of plant. Maintenance of the safety systems is essential for its safe and reliable operation. Reliability Centered Maintenance at NPP is the program which assure that plant system remains within original design criteria and that is not adversely affected during the plant life time. Aim of this paper is to provide the RCM framework to implement it on safety systems. RCM framework is described in four major steps.

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Development of RCM based power facility analysis and diagnosis system (RCM 기반의 전력설비 수명 평가 및 진단 시스템 개발)

  • Lee, Seok-Chan;Jeon, Tae-Young;Shin, Yong-Hak;Lee, Yong-Hee
    • Proceedings of the KIEE Conference
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    • pp.117-119
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    • 2006
  • 주기적인 점검이 필수적인 전력설비에 대해 RCM (Reliability centered maintenance) process를 적용 하면 유지보수 비용을 절감할 수 있을 뿐만 아니라 안전, 환경상의 건전성과 설비의 가용도 및 신뢰성 향상에 기여할 수 있다. 하지만 RCM 기반의 진단 process는 정형화하기 매우 까다롭다. 당사에서는 반복되는 시간 지향형 보수 활동을 최소화 하고, 고장원인 및 결과 분석에 바탕을 두어 보수 지침을 작성하고 시행할 수 있는 RCM기반의 진단 시스템 개발에 대해 논하고자 한다.

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Extreme Event Analysis Using High Resolution RCM Climate Change Precipitation Scenario and CWGEN in Korea (고해상도의 강수변화 시나리오와 CWGEN을 이용한 극한 강우 특성에 관한 연구)

  • Kwon, Hyun-Han;Kim, Byung-Sik;Yoon, Seok-Young
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.279-283
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    • 2008
  • 국외를 중심으로 기존 GCM보다 해상도가 높은 Regional Climate Model(RCM)을 이용한 분석이 일부 시행되고 있으나, 국내에서는 이를 이용한 연구가 아직 미비한 실정이다. 이러한 관점에서 본 연구에서는 27km의 해상도를 갖는 기상청 RegCM3 RCM에서 도출된 기후변화 SRES 시나리오 자료를 이용하고자 한다. 수자원의 장기 거동을 강우-유출 모형으로 모사하기 위해서는 입력 자료인 일 강수자료 계열을 모의발생이 필요하며 본 연구에서는 천이확률 및 강수 모의에 이용되는 Gamma 확률분포와 같은 분포형의 매개변수들이 외부 인자 즉 기후변화 시나리오에 따라 조건부로 변동할 수 있는 CWGEN(Cross-validated Canonical Correlation Analysis-Weather Generator) 강수 모의기법을 도입하여 이용하였다. RCM 자료 그 자체는 일반적으로 시 공간적으로 왜곡되어 있어 Quantile Mapping을 통하여 수정을 하였다. 최종적으로 모의된 결과를 바탕으로 기후변화에 따른 극치사상들에 대한 정량적인 거동을 추정하고 평가하였다.

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