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IEEE Transactions on Reliability

Issue 3 • Date Aug 1989

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Displaying Results 1 - 25 of 25
  • Case study: reliability of the INEL-Site Power System

    Publication Year: 1989, Page(s):279 - 284
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Recent power outages at the EG&G Idaho National Engineering Laboratory (INEL) prompted some customers to call for major modifications to the power system. The reliability of the INEL-Site Power System (a loop configuration) was analyzed to understand the true performance of the system and the dominant causes of outages. This was done using fault-tree modeling along with the IRRAS-PC computer c... View full abstract»

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  • New moment-identities based on the integrated survival function

    Publication Year: 1989, Page(s):358 - 361
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A result by F.J. Samaniego (ibid., vol. R-31, p.455-7, 1982) representing moments of positive random variables in terms of multiple integrals of the survivor function is extended in two direction. Identities are developed which apply to random vectors, any or all of whose components may assume negative values. Applications to multivariate new better than used distributions are discussed View full abstract»

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  • Hidden dependence in human errors

    Publication Year: 1989, Page(s):296 - 300
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Two methodological refinements to the technique for human error rate prediction (THERP) for adjusting predictions to accommodate unconsidered sources of dependency are presented. (1) Synchrony adjustment estimates dependencies among errors due to cyclical patterns in performing otherwise unrelated activities. Synchrony adjustments would also be appropriate for modeling repairs and component burn-i... View full abstract»

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  • Bivariate mean residual life

    Publication Year: 1989, Page(s):362 - 364
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    An overview is presented of some theoretical results concerning the mean residual life function used in reliability theory. An extension of the concept to the bivariate case is introduced, and the relationship between the reliability and mean residual life function is derived. The properties of the function and conditions for asymptotic exponentiality of component life lengths are discussed View full abstract»

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  • Bias in a stress-strength problem

    Publication Year: 1989, Page(s):386 - 387
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The bias of the maximum likelihood estimator for R≠Pr{ X<Y} where X and Y are independent normal random variables with unknown parameters is discussed. The bias is an odd function with respect to δ=gauf-1 (R), where gauf(·) is the Cdf of the standard normal distribution, so the study is restricted to R &ge... View full abstract»

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  • A note on 3-state systems

    Publication Year: 1989, Page(s):277 - 278
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    D.M. Malon (ibid., vol. 38, p.275-6, Aug. 1989) points out a pitfall of certain reliability problems pertaining to systems of three-state devices. The inference to be drawn from his observation is that special care should be used in describing such systems and in specifying exactly what constitutes success and failure. The present authors (ibid., vol.37, p.388-94, Oct. 1988) have modeled systems t... View full abstract»

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  • The number of failed components in a consecutive-k-of-n:F system

    Publication Year: 1989, Page(s):338 - 340
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    For a consecutive-k-out-of-n:F system an exact formula and a recursive relation are presented for the distribution of the number of components, X, that fail at the moment the system fails. X estimates how many cold spares are needed to replace all failed components upon system failure. The exact formula expresses the dependence of the distribution of X ... View full abstract»

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  • Objective and subjective estimates of human error

    Publication Year: 1989, Page(s):301 - 304
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    It is shown that if subjective estimates of probabilities of events are to be converted to objective estimates by means of one or two empirical anchors, a currently recommended equation can produce meaningless values of probability which exceed unity. This new method guarantees rescaling to keep probability in the range [0, 1]. An example is given to demonstrate the approach View full abstract»

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  • On a common error in open and short circuit reliability computation

    Publication Year: 1989, Page(s):275 - 276
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    In reliability computations for complex systems subject to two kinds of failure, analysts sometimes underestimate system reliability by using a formula that actually applies only to certain simpler structures. This error occurs several times, for example, in an otherwise instructive paper by B.W. Jenney and D.J. Sherwin (ibid., vol.R-35, p.532-8, Dec. 1986). The purpose of this work is to describe... View full abstract»

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  • On estimating parameters in a discrete Weibull distribution

    Publication Year: 1989, Page(s):348 - 350
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Two discrete Weibull distributions are discussed, and a simple method is presented to estimate the parameters for one of them. Simulation results are given to compare this method with the method of moments. The estimates obtained by the two methods appear to have almost similar properties. The discrete Weibull data arise in reliability problems when the observed variable is discrete. The modeling ... View full abstract»

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  • A statistical approach for determining release time of software system with modular structure

    Publication Year: 1989, Page(s):365 - 372
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    An algorithmic procedure is developed for determining the release time of a software system with multiple modules where the underlying module structure is explicitly incorporated. Depending on how much the module is used during exception, the impact of software bugs from one module is distinguished from the impact of software bugs from another module. It is assumed that software bugs in one module... View full abstract»

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  • On estimating the mean time to failure with unknown censoring

    Publication Year: 1989, Page(s):343 - 347
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Sometimes, in reliability studies, neither the life of all failed units nor the number of units still functioning is known at any specific time due to problems such as administrative delays. Consequently, one might consider an estimate of the mean time to failure (MTTF) based only on known failure times of part of the units. An investigation is conducted into the bias and efficiency of such an est... View full abstract»

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  • A decomposition scheme for the analysis of fault trees and other combinatorial circuits

    Publication Year: 1989, Page(s):312 - 327, 332
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1244 KB)

    A new decomposition scheme for the analysis of fault trees and other more general combinatorial circuits is presented. The scheme is based on a tabular representation for the necessary information about a subsystem and generalizes the concept of modular decomposition. The basic algorithm is extended to obtain a very fast method for finding the sensitivity of the results to a large class of perturb... View full abstract»

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  • Better than Venn?-the Ben diagram

    Publication Year: 1989, Page(s):341 - 342
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The Ben diagram is proposed as an alternative to the Venn diagram which carries the same information but has certain advantages including better consistency of representation and a more systematic method of construction. The Ben diagram also lends itself well to representing probabilistic relationships among events. As a tool for teaching event state-space concepts, it is believed to be better tha... View full abstract»

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  • Reliability analysis of a class of fault-tolerant systems

    Publication Year: 1989, Page(s):333 - 337
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    An architecture called the digital-data system is proposed to increase the reliability of a class of communication and network control systems. A general expression for the reliability of this system is derived using the total probability theorem, and the issue of minimizing the system cost is discussed. The architecture is quite general in that it models software fault-tolerant systems such as th... View full abstract»

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  • Evaluation of system reliability with common-cause failures, by a pseudo-environments model

    Publication Year: 1989, Page(s):328 - 332
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    An efficient method for calculating system reliability with CCFs (common-cause failures) is presented by applying the factoring (total probability) theorem when the system and its associated class of CCFs are both arbitrary. Existing methods apply this theorem recursively until no CCF remains to be considered, and so can be time-consuming in computation. The method applies such a theorem only once... View full abstract»

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  • Availability of CNC machines: multiple-input transfer-function modeling

    Publication Year: 1989, Page(s):285 - 295
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Computer numerical control (CNC) machines are an integral part of FMSs (flexible manufacturing systems). Frequent breakdown of CNC machines can lead to an unacceptable level of downtimes in FMSs. The acquisition of CNC machines has been justified on economic grounds; however, some analyses do not consider the breakdown of CNC machines. The interrelationship between the downtimes, type of breakdown... View full abstract»

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  • The Bayes predictive approach in reliability theory

    Publication Year: 1989, Page(s):379 - 382
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A strong motivation for reliability analyses is to support decision-making relative to the construction and operation of systems involving an economic/environmental risk. The Bayes approach to making decisions in face of uncertainty about mission survival is presented step by step. The authors show how the decision maker defines his own predictive probability distribution on the system time to fai... View full abstract»

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  • Approximate MLE of the scale parameter of the Rayleigh distribution with censoring

    Publication Year: 1989, Page(s):355 - 357
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    For the Rayleigh distribution, the maximum-likelihood method does not provide an explicit estimator for the scale parameter for left-censored samples; however, such censored samples arise quite often in practice. The author provides a simple method of deriving explicit estimators by approximating the likelihood function and obtains the asymptotic variance of this estimator. He shows that this esti... View full abstract»

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  • A new class of bathtub-shaped hazard rates and its application in a comparison of two test-statistics

    Publication Year: 1989, Page(s):351 - 354
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A class of life distributions arising in reliability situations has bathtub shaped hazard rates. The author investigates the problem of testing exponentiality (constant hazard rate) against bathtub distributions. A critical note on well-known bathtub distributions is made from a practical point of view, and a class of bathtub-distributions is introduced that is extremal in the context of power inv... View full abstract»

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  • Properties of continuous analog estimators for a discrete reliability-growth model

    Publication Year: 1989, Page(s):373 - 378
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A discrete reliability-growth model (appropriate for success-failure data) whose derivation parallels that of a popular nonhomogeneous Poisson process model (appropriate for continuous failure time data) is considered.,Following J. M. Finkelstein (ibid. vol.R-32, p.508-11, Dec. 1983) continuous analog estimators are defined for use with the discrete model when there is a constant prespecified numb... View full abstract»

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  • Bounds for the probability of failure resulting from stress/strength interference

    Publication Year: 1989, Page(s):383 - 385
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The failure probability in static stress-strength models is determined by the interference region. Methods have been devised which determine the bounds on this unreliability based only upon the independent probabilities in this region; no distribution identification or knowledge of the means or variances is required. Unfortunately, empirical evidence demonstrates that existing methods can provide ... View full abstract»

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  • Smaller sums of disjoint products by subproduct inversion

    Publication Year: 1989, Page(s):305 - 311
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A new method is presented for calculating system reliability by sum of disjoint products. While the Abraham algorithm (1979) and its successors invert single variables, this new method applies inversion also to products of several variables. This results in shorter computation time and appreciably fewer disjoint products. Hence, the system reliability formula is considerably reduced in size. The A... View full abstract»

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  • Reliability analysis of capacity and voltage constrained, optimally operated, electric power systems

    Publication Year: 1989, Page(s):392 - 397
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A method for reliability evaluation of capacity and voltage constrained bulk power systems is suggested based upon contingency analysis. For each contingency and consumer load demand situation assumed, the optimal operation of the power system is established that minimizes the total system consumer curtailment cost. Consumer demands at different nodes may be treated as synchronous or as mutually u... View full abstract»

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  • Availability calculations with exhaustible spares

    Publication Year: 1989, Page(s):388 - 391
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Many systems rely solely on the spares they carry to fulfil their missions. The authors develop relatively simple equations for the availability of a system with exhaustible spares. The equations are conservative but, for a large system, are more tractable than simulation or the exact approach based on Markov theory. The equations are useful for tradeoff or sensitivity analysis. Given various comp... View full abstract»

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Aims & Scope

IEEE Transactions on Reliability is concerned with the problems involved in attaining reliability, maintaining it through the life of the system or device, and measuring it.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
W. Eric Wong
University of Texas at Dallas
Advanced Res Ctr for Software Testing and Quality Assurance

ewong@utdallas.edu