• Journal of Korean Society of Steel Construction
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• v.14 no.2
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• pp.365-373
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• 2002

In this paper, the system reliability concept was presented to predict the lifespan of bridges. Lifetime distribution functions (survivor functions) were used to model real bridges to predict their remaining life. Using the system reliability concept and lifetime distribution functions (survivor functions), a program called LIFETIME was developed. The survivor functions give the reliability of component at time t. The program was applied to an existing Colorado state highway bridge to predict the failure probability of the time-dependent system. The bridge was modeled as a system, with failure probability computed using time-dependent deteriorating models.

• Proceedings of the Korean Reliability Society Conference
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• 2004.07a
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• pp.313-333
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• 2004

품질개선 활동의 효율성 평가(년도별 제품의 신뢰성 추이관찰), 부품 개선효과 예측 및 판단, 주요 부품에 대한 고장 모드별 형상 모수 파악$\rightarrow$가속수명 설계 활용, 신제품 개발시 신뢰성 목표 수립 및 양산제품의 개선 목표 설정(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.319-321
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• 2002

인터넷 기반 네트워크 통신의 형태가 단순한 텍스트 위주의 데이터로부터 실시간 환경을 요구하는 멀티미디어 데이터 형태로 변하고 있으며, 실시간 분산처리 시스템에 대한 수요가 증가하고 있다. 이러한 실시간 시스템은 분산 실시간 처리 시스템에 대한 전반적인 분야의 발전이 필요하며, 특히 그 중에서도 신뢰성이 높은 그룹 통신 시스템의 개발은 매우 중요하다. 따라서 본 논문에서는 고장탐지 기능이 있는 실시간 그룹 통신 시스템을 설계하였다. 설계된 실시간 그룹통신 시스템은 이미 TMO 모델을 통하여 메시지 신뢰성과 고장탐지에 관한 시뮬레이션을 하였고, 그 결과를 분석하여 실시간 그룹통신 시스템 설계에 반영하였다.

• Proceedings of the Korean Reliability Society Conference
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• 2001.06a
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• pp.59-65
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• 2001

• Proceedings of the Korean Reliability Society Conference
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• 2002.06a
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• pp.339-363
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• 2002

• Proceedings of the Korean Reliability Society Conference
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• 2000.11a
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• pp.415-428
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• 2000

• Journal of Korean Society for Quality Management
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• v.9 no.1
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• pp.3-11
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• 1981

A stress-strength model is formulated for s of k systems consisting of identical components. We consider minimum variance unbiased (MVU) estimation of system reliability for data consisting of a random sample from the stress distribution and one from the strength distribution when the two distirubtions are Weibull with unknown scale parameters and same known shape parameter. The asymptotic distribution of MVU estimate of system reliability in the model is obtained by using the standard asymptotic properties of the maximum likelihood estimate of system reliability and establishing their equivalence. Uniformly most accurate unbiased confidence intervals are also obtained for system reliability. Empirical comparison of the two estimates for small samples is studies by Monte Carlo simulation.

• Journal of The Korean Association of Information Education
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• v.13 no.1
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• pp.96-104
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• 2009

We want to achieve the reliable information system such as e learning system in the internet environments. The difficulty of the program reliability estimation comes from faults that occurred from program and data files are distributed among several servers. This paper is focus on a modeling approach based on Colored Petri Nets to estimate the program reliability in an internet environment. The procedure of analyzing the reliability is as follows. At first, we propose an internet program model. This model is transformed into a Colored Petri net, and the reliability is estimated. We adapt this model to the analyzing the reliability in the internet environment. This method is very simple, and is very helpful to develope program

• Journal of the Earthquake Engineering Society of Korea
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• v.7 no.2
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• pp.93-102
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• 2003

A technique for the seismic reliability evaluation of electric power transmission network system(EPTS) was developed to evaluate reliability indices corresponding to the whole network system and to each node within. A network model with nodes and links for EPTS was established, and a seismic substation fragility curve obtained from seismic fragilities of power system facilities was derived. A point source model, the doubly truncated Gutenberg-Richter relationship, and earthquake intensity attenuation formula was applied to simulate seismic events. Using Monte-Carlo simulation method, the seismic reliability of EPTS was evaluated and, it appeared that seismic effect on EPTS of korea has to be considered.

• Proceedings of the Korean Reliability Society Conference
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• 2001.06a
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• pp.279-286
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• 2001

국제규격인 IEC 300 신뢰성 경영규격의 3-9절을 중심으로 기술적 시스템(technological systems)의 리스크 분석(risk analysis)에 대해 소개한다. 리스크 분석에 사용되는 용어 및 정의, 리스크 분석 개념과 절차, 제품 수명주기동안 적용되는 리스크 분석과 리스크 경영활동, 그리고 리스크 분석에 사용되는 기법들에 대해 살펴본다.