• Title, Summary, Keyword: RCM

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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.

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.

Optimal Lactic Acid Fermentation Conditions and Quality Properties for Rubus coreanus Miquel (Bokbunja) and Chlorella Mixtures (복분자와 클로렐라 혼합물의 젖산발효 최적조건 및 품질 특성)

  • Kim, Jae-Young;Lee, Sang-Uk;Kim, Na-Hyung;Moon, Kwang-Hyun;Baek, Seung-Hwa
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.45 no.3
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    • pp.386-395
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    • 2016
  • To develop a functional fermentation food from Rubus coreanus Miquel (Bokbunja) and chlorella mixtures, optimal lactic acid fermentation conditions were established, and quality properties based on physicochemical evaluation such as chemical compositions, free sugars, organic acids, and antibacterial activities were investigated. Regarding optimal fermentation strain selection, formation of lactic acid was best in Lactobacillus plantarum among the experimental strains (10 kinds), and the optimal fermentation temperature was $37^{\circ}C$. In addition, overall acceptability in the sensory evaluation was highest in the 5% chlorella mixture sample. Therefore, quality properties of the prepared sample under the established optimal fermentation conditions were investigated. Moisture, total sugar (dry basis), crude fiber (dry basis), and pH of fermented Rubus coreanus Miquel juice (RCM) with 5% chlorella mixture (RCM-C5) were reduced by 4.90%, 14.15%, and 0.32%, respectively, as compared with non-fermented RCM. Meanwhile, crude protein, crude fat, and crude ash (dry basis) of RCM-C5 were elevated by 13.75%, 0.18%, and 0.73%, respectively, as compared with RCM. The yellowness (b value) of color values was greater in RCM-C5 compared to RCM. The free sugar and organic acid contents of RCM-C5 were elevated by 0.97% and 616.30 mg%, respectively, as compared with RCM. In addition, the gram positive bacterium Staphylococcus aureus was elevated by 5.83% while gram negative bacteria Escherichia coli and Salmonella Typhimurium were elevated by 2.94% and 4.67%, respectively, as compared with RCM. In conclusion, the quality properties of RCM and chlorella lactic acid fermentation mixtures were improved compared with the general RCM product. Consequently, it is possible to apply fermented RCM as a functional fermentation food.

Reliability Centered Maintenance (보전에 중점을 둔 신뢰성)

  • 김환중
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • pp.199-204
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    • 2002
  • Reliability Centered Maintenance(RCM) was initially developed for the commercial aviation industry in the late 1960s and now is equally applicable to a variety of equipment other than aircraft. RCM is a method for establishing a preventive maintenance program which will efficiently and effectively allow the achivement of the required safety and availability levels of equipment and structures. RCM provides for the use of a decision logic tree to identify applicable and effective preventive maintenance requirements for equipment and structures. The end result of working through the decision logic is a judgement as to the necessity of performing a maintenance task. In this paper, we provide guiding principles based on IEC 60300-3-11 for RCM analysis methods and operational method of structure and equipment.

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Reliability Centered Maintenance (보전에 중점을 둔 신뢰성)

  • 김환중
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • pp.199-204
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    • 2002
  • Reliability Centered Maintenance(RCM) was initially developed for the commercial aviation industry in the late 1960s and now is equally applicable to a variety of equipment other than aircraft. RCM is a method for establishing a preventive maintenance program which will efficiently and effectively allow the achivement of the required safety and availability levels of equipment and structures. RCM provides for the use of a decision logic tree to identify applicable and effective preventive maintenance requirements for equipment and structures. The end result of working through the decision logic is a judgement as to the necessity of performing a maintenance task. In this paper, we provide guiding principles based on IEC 60300-3-11 for RCM analysis methods and operational method of structure and equipment.

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A Study on the Analysis of the Reliability and the Safety to apply RCM to Railway System (철도시스템 RCM 적용을 위한 신뢰성 및 안전성 분석 활동에 관한 연구)

  • Kim, Soo-Myung;Lee, Duk-Gyu;Lee, Kyoung-Hak;Lee, Key-Seo;Shin, Seok-Kyun
    • Journal of the Korean Society for Railway
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    • v.9 no.6
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    • pp.739-745
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    • 2006
  • The role of maintenance in railway is going to be extended to improve the reliability of railway system in the aspect of Asset management gradually. In this paper, the meaning of reliability and safety in RCM which has been applied in order to improve the efficiency of maintenance is deduced. And the analysis task of reliability and safely which has been recommended in railway standards such as EN50126 and IEC62278 is reviewed in the aspect of RCM. Finally, the several ways are proposed to apply RCM to railway system through the comparison between the RCM procedure and the analysis procedure for the reliability and safety in railway standards. Hereafter, if the analysis of reliability and safety is performed with the concept of RCM in the beginning of railway business, it will be more efficient to improve the reliability and manage the railway asset.

Prediction of Long-term Runoff for Hapcheon Dam Watershed through Multi-Artificial Neural Network Downscaling of KMA's RCM (기상청 RCM전망의 다지점 인공신경망 상세화를 통한 합천댐 유역의 장기유출 전망)

  • Kang, Boo-Sik;Moon, Su-Jin;Kim, Jung-Joong
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.948-948
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    • 2012
  • 합천댐유역에 대한 기후변화에 따른 수문학적 영향을 정량적으로 분석하기 위해, 기상청에서 제공하는 공간해상도 27km의 MM5 RCM(Regional Climate Model)을 사용하였다. RCM의 기상변수들은 공간적 스케일의 상이성과 RCM 기후변수들의 불확실성 때문에 유출모형인 SWAT의 입력자료로 사용하기에는 어려움이 있다. 특히, RCM 변수들 중 강수량의 경우 한반도 지역의 6월과 10월 사이에 연강수량의 67%이상이 집중되는 계절성을 반영하지 못하고 있는 실정이기 때문에 국내 유역의 유출량 산정에 사용하기 위해서는 지역적 상세화(Downscaling)가 필요하다. 본 연구에서는 RCM 기후변수에 내포된 공간적 스케일의 상이성과 불확실성을 최소화하기 위해 강우관측소 지점을 단위로 한 다지점 인공신경망 기법을 적용하여 강수량, 습도, 최고기온 및 최저기온에 대한 상세화를 실시하였다. 강수의 경우 여름철 태풍사상을 모의하기 위한 Stochastic Typhoon Simulation기법과 Baseline(1991~2010)과 Projection(2011~2100) 사이의 강수량 보정을 위한 Dynamic Quantile Mapping 기법을 적용하여, 강수량의 불확실성을 최소화 하고자 하였다. 상세화된 기후자료를 이용한 SWAT 모형의 일(Daily) 단위 강우-유출 모의결과를 2011~2040년, 2041~2070년, 2071~2100년으로 구분하여 추세분석을 실시하였다.

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Anti-inflammatory effects of Rubus coreanus Miquel through inhibition of NF-${\kappa}B$ and MAP Kinase

  • Lee, Jung Eun;Cho, Soo-Muk;Park, Eunkyo;Lee, Seung Min;Kim, Yuri;Auh, Joong Hyuck;Choi, Hyung-Kyoon;Lim, Sohee;Lee, Sung Chul;Kim, Jung-Hyun
    • Nutrition Research and Practice
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    • v.8 no.5
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    • pp.501-508
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    • 2014
  • BACKGROUND/OBJECTIVES: Rubus Coreanus Miquel (RCM), used as a traditional Korean medicine, reduces chronic inflammatory diseases such as cancer and rheumatoid arthritis. However, its mechanism has not been elucidated. In this study, we examine the anti-inflammatory effects of RCM and their possible mechanisms using RAW 264.7 cells. MATERIALS/METHODS: Unripe RCM ethanol extract (UE), unripe RCM water extract (UH), ripe RCM ethanol extract (RE), and ripe RCM water extract (RH) were prepared. Inflammatory response was induced with LPS treatment, and expression of pro-inflammatory mediators (iNOS, COX-2, TNF-${\alpha}$, IL-$1{\beta}$, and IL-6) and NO and $PGE_2$ productions were assessed. To determine the anti-inflammatory mechanism of RCM, we measured NF-${\kappa}B$ and MAPK activities. RESULTS: UE and UH treatment significantly reduced NF-${\kappa}B$ activation and JNK and p38 phosphorylation and reduced transcriptional activities decreased iNOS, COX-2, and pro-inflammatory cytokines expressions, and NO and $PGE_2$ productions. RE and RH treatments reduced IL-$1{\beta}$ and IL-6 expressions through suppressions of JNK and p38 phosphorylation. CONCLUSIONS: In this study, we showed that RCM had anti-inflammatory effects by suppression of pro-inflammatory mediator expressions. Especially, unripe RCM showed strong anti-inflammatory effects through suppression of NF-${\kappa}B$ and MAPK activation. These findings suggest that unripe RCM might be used as a potential functional material to reduce chronic inflammatory responses.

The Effect of Various Culture Media on Histological Anatomy and Saikosaponin Content in Hairy Root Culture of Buplurum falcatum (시호 모상근 배양에서 배지성분에 따른 사이코사포닌 함량과 조직학적 형태의 차이)

  • Ahn, Jun-Cheul;Jeong, Young-Jae;Lee, Kyu-Bae;Kim, Ock-Tae;Hwang, Baik
    • Korean Journal of Medicinal Crop Science
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    • v.7 no.4
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    • pp.251-256
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    • 1999
  • Growth rate and saikosaponin content of Buplurum falcatum hairy root on MS and RCM basal media were measured. And using hairy root cultured in those media, it was investigated whether some correlation between differences in growth rate and saikosaponin content and histiological difference was or not. Results obtained showed that among media tested, MS and 3RCM medium which showed the faster growth in fresh weight and dry weight, respectively. And saikosaponin content of hairy root cultured in 3RCM was $2.2{\sim}5.5$ times higher than that of 1 year cultivated roots, whereas that in MS was extremely low. On the other hand, histological differences of root tips and about 1 cm region from root tip cultured in both MS and 3RCM were not prominent, however, in mature region, a lot of cells only in 3RCM contained densely stained vacuoles or organelles which probably contain tannin, suggesting that development of those has a correlation with biosynthesis of secondary metabolites containing saikosaponin.

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Calculation of Maintenance Cost for RCM Analysis of Railway Vehicle (철도차량의 RCM 분석을 위한 유지보수비용 산출방안)

  • Lee, Chang-Hwan;Park, Byoung-Noh;Lim, Sung-Soo
    • Proceedings of the KSR Conference
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    • pp.1481-1486
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    • 2008
  • To apply more effective the RCM analysis for railway vehicle, the maintenance cost per equipment should be considered together with failure criticality per equipment considered in existing. This paper is described the systematic calculation of maintenance cost considering the RCM analysis of railway vehicle. To calculate the maintenance cost systematically, the cost breakdown structure was established, and basic cost information and calculated cost items were defined. In addition, the linking between calculated cost and RCM analysis was considered. In future, this proposal would be used to analysis of cost effectiveness through RCM analysis of railway vehicle.

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