• 제목/요약/키워드: Reliability growth

검색결과 807건 처리시간 0.031초

가속수명시험을 이용한 다련장 발사대 신뢰도 성장 연구 (A Study on the Reliability Growth of Multiple Launch Rocket System Using Accelerated Life Testing)

  • 이용준;류정민;손권일;송석봉;김상부;박우재
    • 한국군사과학기술학회지
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    • 제22권2호
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    • pp.241-248
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    • 2019
  • In this paper, we aim to check the reliability growth of multiple launch rocket components by the life evaluation. We apply the Crow-AMSAA model to the sets of test data obtained from the development phase. The result of the data analysis shows that the reliability of some components needs to be improved. In order to improve their reliability, we analyze the failure mechanism and change their designs. The verification of the reliability growth for those components is done by analyzing the data sets obtained by the accelerated life tests. As a result, we show that the MTBF of those components is increased and also their reliabilities improved.

A Coverage Function for Arbitrary Testing Profile and Its Performance

  • Park Joong-Yang;Fujiwara Takaji;Park Jae-Heung
    • International Journal of Reliability and Applications
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    • 제6권2호
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    • pp.87-99
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    • 2005
  • Coverage-based software reliability growth models (SRGMs) have been developed and successfully applied in practice. Performance of a coverage-based SRG M depends on the coverage function employed by the SRGM. When the coverage function represents the coverage growth behavior well irrespective of type of the testing profile the corresponding coverage-based SRGM is expected to be widely applicable. This paper first conducts a study of selecting the most representative coverage functions among the available coverage functions. Then their performances are empirically evaluated and compared. The result provides a foundation for developing widely applicable coverage-based SRGMs and monitoring the progress of a testing process.

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변화점을 갖는 불완전수정 소프트웨어 신뢰도 성장모형 연구 (An Imperfect Debugging Software Reliability Growth Model with Change-Point)

  • 남경현;김도훈
    • 품질경영학회지
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    • 제34권4호
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    • pp.133-138
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    • 2006
  • In this paper, we propose a software reliability growth model (SRGM) based on the testing domain, which is isolated by the executed test cases. This model assumes an imperfect debugging environment in which new faults are introduced in the fault-correction process. We consider that the fault detection rate of NHPP model is changed in the proposed SRGM. We obtain the maximum likelihood estimate, and compare goodness-of-fit with another existing software reliability growth model.

Lloyds Register Asia Rail Systems Reliability Lifecycle Management

  • Jonathan, Bouchard
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2003년도 추계학술대회 논문집(I)
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    • pp.27-43
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    • 2003
  • Reliability Lifecycle from Concept to In-Service Operation and Maintenance. Reliability management must consider - SAFETY - SERVICE REQUIREMENTS. Reliability targets/objectives can be specified at feasibility stage. Reliability analysis to support design process. Reliability assessment to support reliability growth or contractual demonstration. Maintenance optimisation to improve reliability during lifetime of operation. Lessons learnt incorporated into next generation of trains.

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해상초계기 주요 항공전자장비 신뢰도 성장 분석 및 운용가용도 시뮬레이션 (A Study on Reliability Growth of P-3 Essential Avionic Equipments and Operational Availability Simulation)

  • 박지훈;마정목
    • 한국군사과학기술학회지
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    • 제23권2호
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    • pp.168-175
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    • 2020
  • Failure of essential avionic equipments have a significant impact on the operations and safety of P-3 maritime patrol aircraft. Therefore, avionic equipments of P-3 are required to have higher reliability. Based on the field failure data, this paper studies the reliability growth of essential avionic equipments in P-3 using Duane model. Additionally, a simulation model is built and implemented for identifying the operational availability according to the field failure data of avionic equipments.

소프트웨어 최적출하정책의 베이지안 접근방법 (A Bayesian Approach to Software Optima I Re lease Policy)

  • 김희수;이애경
    • 한국신뢰성학회:학술대회논문집
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    • 한국신뢰성학회 2002년도 정기학술대회
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    • pp.273-273
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    • 2002
  • In this paper, we investigate a software release policy with software reliability growth factor during the warranty period by assuming that the software reliability growth is assumed to occur after the testing phase with probability p and the software reliability growth is not assumed to occur after the testing phase with probability 1-p. The optimal release policy to minimize the expected total software cost is discussed. Numerical examples are shown to illustrate the results of the optimal policy. And we consider a Bayesian decision theoretic approach to determine an optimal software release policy. This approach enables us to update our uncertainty when determining optimal software release time, When the failure time is Weibull distribution with uncertain parameters, a bayesian approach is established. Finally, numerical examples are presented for illustrative propose.

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중첩 NHPP를 이용한 소프트웨어 신뢰도 평가 모형 연구 (A Study on Software Reliability Assessment Model of Superposition NHPP)

  • 김도훈;남경현
    • 품질경영학회지
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    • 제36권1호
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    • pp.89-95
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    • 2008
  • In this paper, we propose a software reliability growth model based on the superposition cause in the software system, which is isolated by the executed test cases in software testing. In particular, our model assumes an imperfect debugging environment in which new faults are introduced in the fault-correction process, and is formulated as a nonhomogeneous Poisson process(NHPP). Further, it is applied to fault-detection data, the results of software reliability assessment are shown, and comparison of goodness-of-fit with the existing software reliability growth model is performed.

Two model comparisons of software reliability analysis for Burr type XII distribution

  • An, Jeong-Hyang
    • Journal of the Korean Data and Information Science Society
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    • 제23권4호
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    • pp.815-823
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    • 2012
  • In this paper reliability growth model in which the operating time between successive failure is a continuous random variable is proposed. This model is for Burr type XII distribution with two parameters which is discussed in two versions: the order statistics and non-homogeneous Poisson process. The two software reliability measures are obtained. The performance for two versions of the suggested model is tested on real data set by U-plot and Y-plot using Kolmogorov distance.

Bayesian Approach for Software Reliability Growth Model with Random Cost

  • Kim Hee Soo;Shin Mi Young;Park Dong Ho
    • 한국신뢰성학회:학술대회논문집
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    • 한국신뢰성학회 2005년도 학술발표대회 논문집
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    • pp.259-264
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    • 2005
  • In this paper, we generalize the software reliability growth model by assuming that the testing cost and maintenance cost are random and adopts the Bayesian approach to determine the optimal software release time. Numerical examples are provided to illustrate the Bayesian method for certain parametric models.

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반응표면을 사용한 터빈 휠의 균열성장 수명에 대한 신뢰성 평가 (Reliability Estimation for Crack Growth Life of Turbine Wheel Using Response Surface)

  • 장병욱;박정선
    • 한국항공우주학회지
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    • 제40권4호
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    • pp.336-345
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    • 2012
  • 균열성장 수명에는 구조 형상의 복잡함, 작용하중의 변동, 재료물성 분포 등의 영향으로 불확실성이 포함된다. 따라서 이러한 불확실 인자들에 대해 계산된 수명의 강건성을 확보하기 위해서는 신뢰성 평가가 요구된다. 하지만 형상이 복잡한 터빈 휠의 경우 균열성장 수명 계산의 주요 변수인 응력확대계수의 표현식을 알기 힘들며, 이를 유한요소해석으로 계산하므로 수명 계산 및 신뢰성 평가에 많은 시간이 요구된다. 따라서 본 연구에서는 균열성장 수명의 반응표면을 사용함으로써 신뢰성 평가의 효율성을 높일 수 있음을 고찰하였다. 이를 위해 형상이 복잡한 터빈 휠을 모델로 유한요소해석으로 생성된 응력확대계수 데이터를 회귀분석하여 근사모델을 생성한 후 응력확대계수의 회귀계수, Paris 계수, 초기균열길이에 대한 균열성장 수명의 반응표면을 생성하여 신뢰성해석에 사용하였다. 신뢰성해석은 몬테카를로 시뮬레이션으로 수행하였으며, 연구결과 반응표면의 사용이 신뢰성 평가 시 필요한 균열성장 수명의 계산량을 효과적으로 줄일 수 있었다.