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对现有NHPP类软件可靠性模型进行分析总结,指明了已有NHPP类软件可靠性模型存在的不足及缺陷。综合考虑缺陷探测率、软件运行覆盖率、排除错误时的错误引入率等软件故障数的影响因素,提出了一种通用的NHPP类软件可靠性模型,最后对通用模型中的泛函数取特殊值后,求得期望故障数及软件可靠度,并对其进行分析,证明了所提模型的有效性。 相似文献
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Gopika Vinod T.V. Santosh R.K. Saraf A.K. Ghosh 《Nuclear Engineering and Design》2008,238(9):2392-2399
In the recent times, computer-based systems are frequently used for protection and control of Nuclear Power Plants (NPPs). In the conventional Probabilistic Safety Assessment (PSA), the contribution from software in these computer-based systems was not given necessary attention. However, from operating experience, it has been found failures in such systems can also result in initiating events that have the potential for leading into Core Damage in the event of unavailability of the respective Engineered Safety Features. The impact of a typical computer-based system on PSA of Indian Nuclear Power Plant is demonstrated. 相似文献
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NHPP模型参数调整与EM算法 总被引:4,自引:0,他引:4
应用NHPP模型进行软件可靠性分析,不可避免的遇到所提供的软件错误数据不完全的情况.由于此类数据中部分信息的缺失,将影响到分析结果.本文以General NHPP模型为核心,介绍软件可靠性估测系统(SRPS)中,应用EM算法进行模型参数的估计与调整,以提高软件可靠性分析结果的质量. 相似文献
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María Luz Gmiz Antonio Jesús Lpez‐Montoya María Dolores Martínez‐Miranda Rocío Raya‐Miranda 《Quality and Reliability Engineering International》2019,35(1):99-115
The objective of this paper is to find out possible patterns of failure occurrences in a repairable system. We develop a graphical exploratory tool and perform visual inference considering non‐parametric local linear kernel estimators for the rate of occurrence of failures (ROCOF) and its first derivative. The shape characteristics of the ROCOF function are distinguished from those which are merely an artefact of the sampling variability of the data through the construction of confidence intervals for the first derivative. The proposal is illustrated with several real data sets, and its performance is evaluated through an extensive simulation study. 相似文献
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软件调试是复杂过程,可能会受到很多种因素的影响,例如调试资源分配、调试工具的使用情况、调试技巧等.在软件调试过程中,当检测到的故障被去除时,新的故障可能会被引进.因此,研究故障引进的现象对建立高质量的软件可靠性增长模型具有重要意义.但是到目前为止,模拟故障引进过程仍是一个复杂和困难的问题.虽然有许多研究者开发了一些不完美调试的软件可靠性增长模型,但是一般都是假设故障内容(总数)函数为线性、指数分布或者是与故障去除的数量成正比.这个假设与实际的软件调试过程中故障引进情况并不完全一致.提出一种基于Weibull分布引进故障的软件可靠性增长模型,考虑故障内容(总数)函数服从Weibull分布,并用相关的实验验证了提出的模型的拟合和预测性能.在用两个故障数据集进行的模拟实验中,实验结果指出:提出的模型和其他模型相比,有更好的拟合和预测性能以及更好的鲁棒性. 相似文献
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考虑不完美排错情况的NHPP 类软件可靠性增长模型 总被引:1,自引:0,他引:1
针对现有NHPP 类软件可靠性增长模型对故障排错过程中不完美排错情况考虑不完全的现状,提出了一
种新的软件可靠性增长模型.该模型全面考虑了不完美排错的两种情况:既考虑了排错过程中引入新错误的可能性,
又考虑了不完全排错的情况,并且引入了一种故障排除率随时间变化的故障排除率函数,使模型更符合实际情况.利
用公开发表的两组不同的软件失效数据对该模型进行验证的结果表明,与现有的对不完美排错情况考虑不完全的
模型相比,该模型能够取得更好的拟合结果和预测效果. 相似文献
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V. Krivtsov M. Frankstein O. Yevkin 《Quality and Reliability Engineering International》2017,33(5):1011-1017
Consider a set of the so‐called sibling components in a multi‐socket repairable system. In the case of an automobile, for example, these siblings would be spark plugs, light bulbs, tires, that is, identical components that are coded with the same part number. When field data are analyzed, a dilemma arises as to how to interpret a recurrent replacement of a sibling component: as a secondary failure of the component that has already been replaced once, or as the first failure of the component's sibling(s)? From the stand point of root‐cause analysis, the task is to understand whether recurrent failures are related to (i) a particular sibling, which might be operating in inauspicious conditions relative to other siblings, or (ii) to all siblings on the vehicle. One could attribute Scenario 1 to a system‐level (e.g. system interaction) problem, and Scenario 2 to a component‐level (supplier quality) problem. We first review a statistical procedure that solves the above‐mentioned dilemma in the framework of ordinary renewal process (ORP) and then extend the discussion to the non‐homogeneous Poisson process (NHPP) and the g‐renewal process (GRP). We also propose advanced Monte Carlo procedure for estimating GRP in this context. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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