Investigation of reliability characteristics under fuzzy environments is proposed in this paper. Fuzzy Weibull distribution and lifetimes of components are using it described. Formulas of a fuzzy reliability function, fuzzy hazard function and their α-cut set are presented. Furthermore, the fuzzy functions of series systems and parallel systems are discussed, respectively. Finally, some num...

The project aimed to investigate how hazard perception and responding is affected by level of experience as a motorcycle rider and to assess the extent to which hazard perception and responding can be improved by specific training. The literature review showed that car drivers with fewer crashes and older or more experienced drivers respond more quickly on hazard perception tasks and that at le...

The present danger in the Haitian rebuilding efforts, outside of the extreme level of need that often encourages temporary solutions at the expense of long-term capacity building, centers on the assumption that sustainability and resilience are mutually exclusive. They cannot be if this rare opportunity to achieve meaningful long-term change within a country that has suffered for far too long i...

Practitioners and researchers use vulnerability indices to understand the conditions that influence hazard risk. However, there has been little research on how well such depict household-scale specific hazards. We examined relationships between an all-hazard index a hazard-specific with household-level adaptive resources, behaviors, proximate sensitivities, self-reported health outcomes related...

The hazard function provides the instantaneous probability of death (or other key end point) at various times after diagnosis. Unlike the survival curve, the hazard function illustrates graphically or through calculations when deaths are common or uncommon. In this study, hazard functions were derived for prostate cancer by using survival data on large numbers of patients with prostate cancer w...

in this paper, we propose and study exp-kumaraswamy distribution. some of its properties  are derived, including the density function, hazard rate function, quantile function, moments,  skewness  and kurtosis.   adata set isused to illustrate an application of the proposed distribution. also, we obtain a new distribution by transformation onexp-kumaraswamy distribution.   new distribution is an...

The natural direct and indirect effects in causal mediation analysis with survival data having one mediator is addressed by VanderWeele. He derived an approach for (1) accelerated failure time regression model general cases (2) a proportional hazards when the time-to-event outcome rare. If not rare, then VanderWeele did derive simple closed-form expression log-natural because baseline cumulativ...

The article focuses on mortality models with a random effect applied in order to evaluate human more precisely. Such are called frailty or Cox models. main assertion of the paper shows that each positive transforms initial hazard rate (or density function) new absolutely continuous survival function. In particular, well-known Weibull and Gompertz rates corresponding functions analyzed different...

Background: Metal pollution is a problem in many parts of the world. These metals can be harmful when they exceed the recommended limits. By analyzing metal concentrations in living organisms, it is possible to deduce the bioavailability and the level of environmental contamination for specific metals in an ecosystem. The aim of this study was to determine the heavy metals copper, cadmium, lead...