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 “"event tree"”.
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Resource Allocation on Networks: Nested Event Tree Optimization, Network Interdiction, and Game Theoretic Methods
… across the breadth of domains that deal with preventing attacks and mitigating their consequences. Adopting a nested event tree optimization framework, we present a novel formulation for the problem as a specially structured nonconvex factorable program, and develop two branch-and-bound schemes …
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Exploring the use of quantitative modelling approaches to support volcanic crisis management in the Auckland Volcanic Field
… of an approach that combined a Bayesian Event Tree hazard assessment with Cost-benefit Analysis (CBA) within an evacuation decision-support framework for Auckland. Firstly, evacuation clearance times were estimated by combining spatial variability in population exposure and vehicle …
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Reliability-based optimization of rail inspection
… inspection is a fundamental intervention to prevent rail failure. Railroads have evolved the rail inspection interval based on their empirical judgement and on field data. A crack size is predicted by linear elastic fracture mechanics (LEFM). The proposed method identifies the time-varying rail …
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Petri net modeling of fault analysis for probabilistic risk assessment
Fault trees and event trees have been widely accepted as the modeling strategy to perform Probabilistic Risk Assessment (PRA). However, there are several limitations associated with fault tree/event tree modeling. These include 1. It only considers binary events; 2. It assumes independence among …
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Uncertainty and Risk Analysis in Fire Safety Engineering
… been applied to an example, structured with the event tree technique, to determine the risk to patients on a hospital ward. In addition to the two risk analysis methods, separate uncertainty analysis methods are also presented. Both stochastic uncertainty and knowledge uncertainty are considered …
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Risk Assessment of Power System Catastrophic Failures and Hidden Failure Monitoring & Control System
… failure probability is presented. A Dynamic Event Tree for the risk-based analysis of system catastrophic failures is proposed. A reduced 179-bus WSCC sample system is studied and the simulation results obtained from California sub-system are analyzed. System weak links are identified in the …
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Applying Probabilistic Risk Assessment to Agricultural Nonpoint Source Pollution
… the product of the frequency of occurrence of an event and the consequences of that event. The purpose of this research was to determine the probability of occurrence of a nitrogen discharge event (i.e., frequency). The consequences of such a discharge event were not explicitly determined but were …
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Concept of Operations and Failure Analysis for a Complex Deployable CubeSat Antenna Payload
… concept of operations. For this purpose, a Fault Tree Analysis is performed for each stage of the deployment sequence. After constructing these fault trees, available telemetry points for the identification of these failure are indicated, allowing for the categorization of failures into those that …
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Initiating Event Analysis of a Lithium Fluoride Thorium Reactor
… of this study is to perform an Initiating Event Analysis for a Lithium Fluoride Thorium Reactor (LFTR) as the first step of a Probabilistic Safety Assessment (PSA). The major objective of the research is to compile a list of key initiating events capable of resulting in failure of safety …
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Dynamic accident sequence analysis using dynamic flowgraph method and Markov/cell-to-cell mapping technique
… safety assessment (PSA) techniques (fault/event tree) to account for dynamic system interactions and time-dependent accident sequence evolution. Subsequently there is an interest within the PSA community to complement the classical techniques with dynamic methodologies; driven in addition …
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Assessing levels of reliability for design criteria for hurricane and storm damage risk reduction structures
… includes point estimate simulation models and event tree methods to quantify the structure’s system reliability. The methodology is used to illustrate differences in analysis results with and without accounting for variance reductions due to spatial correlation are also presented through …
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System reliability analysis of structures subjected to fatigue induced sequential failures using evolutionary algorithms
… sequences with significant likelihoods by an event-tree search coupled with system reliability analyses: however, this approach is time-consuming or intractable due to repeated calculations of the probabilities of innumerable failure modes, which often necessitates using heuristic assumptions …
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Development of a human factors hazard model for use in system safety analysis
… probabilistic analysis tools of Fault Tree Analysis (FTA) and Event Tree Analysis (ETA), and integrates them with a newly developed Human Error Probability (HEP) predictive tool. This new approach is developed around Performance Shaping Factors (PSFs) relevant to human behavior, as well …
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Advanced risk management in offshore terminals and marine ports
… and develop appropriate strategies to take preventive/corrective actions for mitigation purposes, with a view of maintaining efficient offshore terminals' and marine ports' operations and management. In the second phase of the research the developed risk-based model incorporating Fuzzy Set …
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Zuverlässigkeitsanalyse für die Staumauer der Diemeltalsperre
… order to avoid or reduce damage are displayed in event trees. The reliability is assessed for each branch of the event tree. The overall probability of dam failure is determined by the combination of the reliabilities of all event trees. The stability of the dam is examined by conventional and …
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Responsabilidade ambiental aplicada ao sector dos resíduos sólidos urbanos : caso de estudo : Aterro Sanitário de Mato da Cruz
… de análise por árvores de acontecimentos (ETA - Event Tree Analysis) e da consequente falha do evento iniciador, referenciado por AE_2 (falha no sistema de drenagem dos lixiviados). A metodologia baseada na Norma UNE 150008:2008 foi fundamental na análise e avaliação de risco ambiental ao …
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On the safety of LNG-fuelled ships
… fuel gas supply system. In this study, an event tree analysis was used to identify events that may cause vapour cloud explosion. General frequency data from various sources was used, and fault tree analysis was applied. Consequence was analysed in terms of the impact from explosion using a …