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Uncertainties in environmental radiological assessment models and their implications

Hoffman, F.O.; Miller, C.W. - 2008

Environmental radiological assessments rely heavily on the use of mathematical models. The predictions of these models are inherently uncertain because these models are inexact representations of real systems. The major sources of this uncertainty are related to biases in model formulation and...

Persistent link: https://www.econbiz.de/10009435418

Methods for developing and validating survivability distributions

Williams, R.L. - 2008

A previous report explored and discussed statistical methods and procedures that may be applied to validate the survivability of a complex system of systems that cannot be tested as an entity. It described a methodology where Monte Carlo simulation was used to develop the system survivability...

Persistent link: https://www.econbiz.de/10009435451

Approaches to implementing deterministic models in a probabilistic framework

Talbott, D.V. - 2009

The increasing use of results from probabilistic risk assessments in the decision-making process makes it ever more important to eliminate simplifications in probabilistic models that might lead to conservative results. One area in which conservative simplifications are often made is modeling...

Persistent link: https://www.econbiz.de/10009435480

Determining perception-based impacts of noxious facilities on wage rates and property values

Nieves, L.A.; Clark, D.E. - 2008

This document, written for the US Department of Energy, discusses current information and the need for future research on estimating the impacts on wages and property values that could result from people's perceptions of the risks associated with noxious facilities. Psychometric studies indicate...

Persistent link: https://www.econbiz.de/10009435650

Material degradation analysis and maintenance decisions based on material condition monitoring during in-service inspections

Yacout, A.M.; Orechwa, Y. - 2009

probability, with confidence interval, of the time that a prescribed degradation level is exceeded is shown to be practical, as … demonstrated in the analysis of irradiated fuel cladding. The methodology for the estimation of the probability is predicated on …

Persistent link: https://www.econbiz.de/10009435687

Estimation of expected value for lognormal and gamma distributions. [Environmental pollutants]

White, G.C. - 2009

Concentrations of environmental pollutants tend to follow positively skewed frequency distributions. Two such density functions are the gamma and lognormal. Minimum variance unbiased estimators of the expected value for both densities are available. The small sample statistical properties of...

Persistent link: https://www.econbiz.de/10009435692

Statistical Validation of Engineering and Scientific Models: A Maximum Likelihood Based Metric

HILLS, RICHARD GUY; TRUCANO, TIMOTHY G. - 2008

and prediction uncertainty with different probability structures. Several examples are presented utilizing this metric. We …

Persistent link: https://www.econbiz.de/10009435763

Fatigue reliability of wind turbine fleets: The effect of uncertainty of projected costs

Veers, P.S. - 2010

probability of individual component failure is sometimes interpreted as the percentage of components likely to fail, this … multiplying by the probability of individual component failure. However, more complicated cost models require a break down of how … many components are likely to fail. This break down enables the calculation of costs associated with various probability of …

Persistent link: https://www.econbiz.de/10009435781

Combination of Evidence in Dempster-Shafer Theory

SENTZ, KARI; FERSON, SCOTT - 2008

uncertainty. The significant innovation of this framework is that it allows for the allocation of a probability mass to sets or … intervals. Dempster-Shafer theory does not require an assumption regarding the probability of the individual constituents of the …

Persistent link: https://www.econbiz.de/10009435897

Selection of technical risk responses for efficient contingencies

Kujawski, Edouard - 2008

) that achieves the lowest total project cost for a given probability of success while meeting technical performance and … not just individual risks. The efficient RRA set is determined based on ''Outcome Cost Vs Probability of Success''. The … risks and RRAs are characterized using scenarios, decision trees, and cumulative probability distributions. The analysis …

Persistent link: https://www.econbiz.de/10009435988