Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Reliability Prediction"”.
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Reliability prediction techniques.
This thesis considers methods for predicting reliability and mean time to first failure of complex systems. The need for these methods, is a result of recent advances in pure materials technology and fabrication procedures, that potentially lead to more reliable systems. In this thesis, two types …
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Software reliability prediction
… parameter estimates of a number of software reliability models. On the basis of the results from analysing 7 sets of real data, these methods are found to be both efficient and reliable. The simple approach of adapting software reliability predictions by Keiller and Littlewood (1984) can …
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Software reliability prediction
… some extensions to existing methods of software reliability estimation and prediction. Firstly, we examine a technique called 'recalibration' by means of which many existing software reliability prediction algorithms assess past predictive performance in order to improve the accuracy of current …
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Software reliability prediction
… and reasons for investigating software reliability models as a tool in the decision making process are outlined. There follows a short review of software reliability models, with the Littlewood and Verrall Bayesian model considered in detail. The difficulties in using this model to …
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Reliability prediction in early design stages
"In the past, reliability is usually quantified with sufficient information available. This is not only time-consuming and cost-expensive, but also too late for occurred failures and losses. For solving this problem, the objective of this dissertation is to predict product reliability in early …
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Software reliability prediction : a multi-modelling approach
Many software reliability models are now available to the user who wishes to assess and make predictions about the future reliability of his/her system by using its past failure behaviour. Experience of applying such models to failure data in the past has shown that, to date, there is no one model …
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Modelling of solder interconnection’s performance in photovoltaic modules for reliability prediction
… joint is carried-out towards thermo-mechanical reliability improvement. Analysis of results shows the design with optimal parameter setting to be: TIMC -2.5μm, TSJ -20μm and WSJ -1000μm. In addition, the optimized model has 16,264 cycles to failure which is 18.82% more than the expected 13,688 …
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Towards the reliability prediction of mechanical components for nuclear safety cases
… a modelling method to increase accuracy in reliability predictions of mechanical components. Such predictions are used in nuclear safety case documentation that is required for a nuclear site license to be granted. The methodology proposed is the use of front-end Finite Element fatigue …
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Reliability analysis for systems with outsourced components
… in tremendous cost savings; it makes system reliability analysis, however, more challenging due to the limited component information available to system designers. The component information is often proprietary to component suppliers. Motivated by the need of system reliability prediction …
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Optimal and Robust Designs of Step-stress Accelerated Life Testing Experiments for Proportional Hazards Models
… life testing (ALT) is widely used to obtain reliability information about a product within a limited time frame. The Cox s proportional hazards (PH) model is often utilized for reliability prediction. My master thesis research focuses on designing accelerated life testing experiments for …
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An investigation into self-test concepts in reconfigurable modular avionics systems
… management of the system resources. A working reliability prediction tool facilitates systems analysis based on the premise that the modular system enjoys extended mission availability by exhibiting resilience to multiple system failures. Results are presented which demonstrate the advantages …
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Efficient time-dependent system reliability analysis
… Accurate and efficient estimate of system reliability is crucial for decision makings on system design, lifetime cost estimate, maintenance strategy, etc. Although significant progresses have been made in time-independent reliability analysis for components and systems, time-dependent …
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Advancements on the Interface of Computer Experiments and Survival Analysis
… until a certain event happens. Data collection, prediction, and uncertainty quantification are also fundamental in survival models. In this dissertation, the proposed methods are motivated by a wide range of real world applications, including high-performance computing (HPC) variability data, jet …
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Software Reliability Issues: An Experimental Approach
… whereby the predictive performance of software reliability models can be analyzed and improved under laboratory conditions. This procedure substitutes the averages of large sample sets for the single point samples normally used as inputs to these models and thus supports scrutiny of their …
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Analysis Methods to Control Performance Variability and Costs in Turbine Engine Manufacturing
… consistently achieve high levels of performance reliability in newly manufactured engines. Much of the variation in performance reliability is due to the combined effect of tolerances of key engine components, including tip clearances of rotating components and flow areas in turbine nozzles. This …
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Knowledge Discovery from Complex Event Time Data with Covariates
… particular engineering applications, such as reliability engineering, complex types of data are encountered which require novel methods of statistical analysis. Handling covariates properly while managing the missing values is a challenging task. These type of issues happen frequently in …
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The Impact of Reliability in Conceptual Design - An Integrated Trade-off Analysis
… on developing models to estimate the systemreliability of Unmanned Ground Vehicles using knowledge and data from similar systems. Traditional reliability approaches often require detailed knowledge of a system and are used in later design stages as well as development, operational test and …
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Utilisation des mécanismes endogènes de modulation de la douleur en contexte clinique : élaboration de valeurs normatives, mesure de la fidélité test-retest et développement et validation d’un modèle de prédiction
Introduction : Les mécanismes de modulation de la douleur sont des processus physiologiques qui régulent la perception de la douleur. La sommation temporelle (ST - mécanismes excitateurs) et les CPM (mécanismes inhibiteurs) ont particulièrement été étudiés à cet égard. D'une part, ils apparaissent …