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Showing 1 to 20 of 23 for “"Reliability estimation"”.
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Network reliability estimation
Computing the reliability of a network is a #P-complete problem, therefore estimation by means of simulation often becomes a favourable choice. In modern communication networks, link failure probabilities are usually small and hence network failures become rare events. This poses a challenge to …
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Software tool for reliability estimation
Reliability engineering is now an essential part of product development. In the area of electronics, reliability needs to be checked for each critical component before the product is shipped. Electronic products can range from computers to pace makers.;Over the years, several tools have been …
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Reliability estimation using doubly censored field data
… and the right. The extreme lack of data makes estimation very difficult. Estimation equations are defined for both maximum-likelihood and moment based estimates. Simulation results obtained using the defined estimation strategies are not promising but do suggest directions for further study.
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Reliability estimation and risk-cost optimisation of underground pipelines
… This research is focused on estimating pipe reliability and deciding when and how interventions are needed to prevent unexpected failures of flexible underground metal pipelines subject to externally applied loadings and pipe material corrosion during the whole service life at the optimal …
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Simplified approach for the reliability estimation of large transmission and sub-transmission systems
Various specialised power system reliability modelling software are commercially available to analyse the expected performance of a utility’s transmission and sub-transmission network. The software requires a physical network model to be constructed, representing all network components. A high …
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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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A simulation and redesign system for circuit hot-carrier reliability
… design system for CMOS VLSI circuit hot-carrier reliability estimation and redesign is presented. The system first simulates circuits to determine the critical transistors that are most susceptible to hot-carrier effect (HCE); it then estimates the impact of HCE on circuit performance and employs …
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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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Evaluation of Soft Output Decoding for Turbo Codes
… design are analyzed. Fundamentals such as reliability estimation, log-likelihood algebra, and soft channel outputs for soft output Viterbi algorithm (SOVA) turbo code decoding are examined. The modified Viterbi metric that incorporates a-priori information used for SOVA decoding is derived. …
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A Study of Mathematical Modeling of Remaining Useful Life, Assessment, and Prognostics & Health Management (PHM)
… useful life has always been an essential part of reliability theory. It has also been equally important in various other fields such as actuarial science, engineering management, survival analysis, etc. This thesis explores two different methods of RUL modeling and assessment: lifetime data …
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Sequential Designs with Application in Software Engineering
… approach to test case allocation in the software reliability estimation. Bayesian analysis allows us to update our beliefs about the reliability of a particular partition as we test, and thus, dynamically re refine our allocation of test cases during the reliability testing process. We started …
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Efficient computer experiment designs for Gaussian process surrogates
… for the purpose of reducing uncertainty in reliability estimation.
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Time-dependent reliability methodologies with saddlepoint approximation
… properties and time-variant loads. Therefore the reliability of engineering systems becomes time-dependent. It is crucial to predict the time-dependent reliability in the design stage, given possible catastrophic consequences of a failure. Although extensive research has been conducted on …
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Reliable chip design from low powered unreliable components
… the benefits of the technology shrinking due to reliability issues. As VLSI technology scales into nanoscale regime, fundamental physical limits are approached, and higher levels of variability, performance degradation, and higher rates of manufacturing defects are experienced. Soft errors, which …
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Prognostics and health management of light emitting diodes
… the remaining useful life and estimating the reliability of systems and products. Prognostics and Health Management (PHM) has emerged in the last decade as one of the most efficient approaches in failure prevention, reliability estimation and remaining useful life predictions of various …
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Efficiently Estimating Survival Signature and Two-Terminal Reliability of Heterogeneous Networks through Multi-Objective Optimization
<p>The two-terminal reliability problem is a classical reliability problem with applications in wired and wireless communication networks, electronic circuit design, computer networks, and electrical power distribution, among other systems. However, the two-terminal reliability problem is among the …
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A Software Reliability Model Combining Representative and Directed Testing
<p>Traditionally, software reliability models have required that failure data be gathered using only representative testing methods. Over time, however, representative testing becomes inherently less effective as a means of improving the actual quality of the software under test. Additionally, the …
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Determining preferred substation configurations based on reliability and cost
… exist, each with its own space requirements, reliability and cost. Distribution planners need to choose between these numerous layouts and suggest the preferred substation configuration for future networks, but often don't understand the advantages and total life cycle cost associated with …
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Finite-element-based system reliability analysis and updating of fatigue-induced sequential failures
… systems, it is thus essential to estimate their reliability and identify critical sequences of local failures leading to system failures. In addition, it is desirable to update the original reliability based on inspection results, which will facilitate reliability-based structural maintenance …
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