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백영구(Baek Young-Gu),송기태(Song Kee-Tae),김민호(Kim Min-Ho),이기서(Lee Key-Seo),신건영(Shin Keon-Young ),이덕규(Lee Duck-Kyu) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The importance of reliability and safety, recently, shows a tendency to increases in railway system constructions and projects. At the point of view of safety, especially, the railway authority proposes an establishment of the safety case that is the documented demonstration that products comply with the specific safety requirements in railway industry. In case of reliability activities, there is no systematic documented demonstration in the railway industry. At this circumstance, this study presents the establishment of Reliability, Availability and Maintainability Case for railway system based on the MoD(Ministry of Defence) 00-42. This RAM Case will support that systems and products produced from suppliers or manufacturers meet the specific RAM requirements during the system life cycle(i.e, from design to operation & maintenance) through systematic process and evidences. Also, it is expected that railway system operations will be managed and supported from reliability activities in accordance with RAM Case.
FTA/ETA 기법을 이용한 철도신호시스템의 위험 분석 및 위험성 평가에 관한 연구
백영구(Baek Young-Gu),박영수(Park Young-Su),이재훈(Lee Jae-Hun),이기서(Lee Key-Seo) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, it was proposed that hazard analysis and risk assessment about railway signal systems using FTA(Fault Tree Analysis) and ETA(Event Tree Analysis) one of the reliability analysis methods executed and output value based on the hazard baseline of CENELEC and EC 61508 producted, and also the SIL(Safety Integrity Level)/THR(Tolerable Hazard Rate) about the system set. On the basis of this principle, more systematic standardizations are required to operate railway system and in the future, we hope that safety and reliability of signal equipment will be better improved.
시스템의 신뢰성과 안전성 향상을 위한 FMEA 개선에 관한 연구
백영구(Baek Young-Gu),윤상문(Yun Shang-Moon),이재호(Lee Jae-Ho),박면규(Park Myeonn-Gyu),이기서(Lee Key-Seo) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, it is proposed that an existing utilizing methods of FMEA, one of the potential failure cause analysis of the systems and products, is reviewed and more efficient advanced application scheme and improvement idea is suggested. In present, in company with Products liability laws which are being conducted, this proposed methods are intended to be applied at systems which require high-reliability and safety.
IEC 규격에 기반한 도시형자기부상열차 열차제어시스템의 시스템 보증 및 안전성 평가 활동
백영구(Young-Goo Baek),박희준(Hee-Jun Park),구중서(Jung-Suh Gu),서도석(Do-Seok Seo),이기서(Key-Seo Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Related to the on-going “Train Control System Project of Pilot Line Construction for Urban MAGLEV Train”, activities by each phase shall be conducted to achieve SIL4 level and obtain safety certification from the Independent Safety Assessment(ISA), based on the IEC standards((IEC 62278/62279 and IEC 62425) for the first time in Korea. This thesis describes the introduction of IEC standards, system assurance activities (such as plan, analysis, test, verification and validation) in compliance with requirements management and project life-cycle and relations with the safety assessment activities and certification activities (such as document reviews and audits) through system RAMS activities, software quality assurance activities and safety assessment, for the purpose of achieving a successful safety certification at the time of completing the project as system assurance activities including software and safety certification activities in order to acquire the safety certification for train control system which does not exist at all in domestic cases. It is believed that overall system safety assurance activities in this project will contribute to develop more upgraded products of the domestic train control system on the quality and safety point of view, find overseas markets and establish a bridgehead in the future.
비-동질 안정 프로세스 기반 임베디드 시스템 소프트웨어의 신뢰성 특성에 관한 연구
한상섭(Han Sang-Seop),백영구(Baek Young-Gu),이근석(Lee Keun-Seog),전현덕(Jeon Hyun-Duck),류호중(Ryu Ho-Jung),이기서(Lee Key-Seo) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we apply NHPP model example to s/w process in order to get to know s/w reliability, The test is constructed by a test zig of commercial product loaded real embedded sytstem s/w. It is established to s/w reliability prediction and estimation of real-time embedded system s/w. It is computed the prediction value of cumulative failures, the failure intensity, the reliability and the estimation value of MTTF, Failure Rate. To the more realization of high reliability in the real-time embedded system s/w, if the embedded system s/w is ensured to the test coverage and constructed to stable s/w process & operating system, we can improve the performance and the reliability characteristic of the real-time embedded system s/w.
효과적인 PM 업무를 위한 RCM분석대상 시스템의 선정
김민호(Kim Min-ho),송기태(Song Kee-Tae),백영구(Baek Young-gu),이기서(Lee Key-Seo),윤화현(Yoon Hwa-Hyun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Most operational organization and railway authority which conduct scheduled maintenance(SM) have carried out the preventive maintenance(PM) based on the information provided from supplier and manufacturer of railway system. However these activities are far away from reality and low the efficiency, it is because an appropriate methods for system selection didn"t take into account for improving maintenance efficiency. Therefore, the current SM tasks and maintenance activities lead to lots of spend on the cost and time. To solve the above problem, this thesis presents new approach methodology. This proposes the criteria for reliability centered maintenance(RCM) system selection through level of quantification of each parameter, i.e, frequency, severity and maintenance cost, etc. To do this, the field operation data and information of maintenance cost are essential. As applying this methodology, we can look forward to improving efficiency of PM/SM, and reducing cost.
김민호(Kim Min-ho),송기태(Song Kee-Tae),백영구(Baek Young-gu),이기서(Lee Key-Seo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
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.
고장원인 확률을 이용한 FMEA와 고장진단 순서의 최적화
송기태(Song Kee-Tae),김민호(Kim Min-Ho),백영구(Baek Young-Gu),이기서(Lee Key-Seo),김수명(Kim Soo-Myong) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, with increasing interested in improvement of operational reliability and the systematic maintenance activities, the RCM analysis has been applied and tried to lots of applicable industries. This study covers applying the probability of failure cause to FMEA, and proposes an analytical method for this. Also, the measures of quantitative classification for the result of failure cause probability are addressed. Based on the field data, this thesis presents an identification for causes and characteristics of failure, and reviews them periodically from the above methodologies. As using FMEA applied the probability of failure cause, we in the future can look forward to improvement of efficiency for failure diagnosis & inspection, and reliability.
철도시스템의 효과적 RCM접근을 위한 신뢰성 기반 검사(RBI)적용
송기태(Song Kee-Tae),김민호(Kim Min-Ho),백영구(Baek Young-Gu),안은진(Ahn Eun-Jin),이기서(Lee Key-Seo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In the current railway industry in Korea, a lot of researches and studies have been progressed to establish RAMS process and construction of RCM system in accordance with international standards. On the point of view of applying the RCM to the railway system, many problems (i.e., reliability of the existing field data, the lack and incorrectness of failure information, etc) are described. To solve these problems, it is need to study and effort the RCM, practically. In this paper, lots of problems and solutions for methods determining the preventive maintenance interval of application of the RCM will be described. To do this, the method using the theory of RBI (Reliability Based Inspection) which is applied to the existing chemical plants and power plants is described. From this study, it is expected that in this situation that the quantitative data is not enough, the results that an analyst quantifies the qualitative factors and/or items will be a good reference that can effectively approach, on the side of determination about each maintenance task and inspection interval.
송기태(Song Kee-Tae),김민호(Kim Min-Ho),백영구(Baek Young-Gu),신건영(Shin Kun-young),이기서(Lee Key-Seo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the study on development of an applicable logic on the characteristics of Rolling stocks will be proposed. In general, this logic which means decision logic or LTA(Logic Tree Analysis) is used to analyze how the failure mode have an effects on the system. The effect would be categorized as safety, operational, economical, etc. To do this, based on the typical logics which have been applied to other industries, such as plants, aero, etc. This paper emphasizes two crucial parameters that is one cost the other customer service, that have an important role in railway system operation. In conclusion, as mentioned above as the logic for which could be effectively applied for the railway system(RST) would be developed.