The operation of a system, such as vehicle, communication network or automatic process, heavily depends on the correct its components. A Stochastic Binary System (SBS) mathematically models behavior on-off systems, where components are subject to probabilistic failures. Our goal is understand reliability global system. evaluation an SBS belongs class NP-Hard problems, and combinatorics imposes ...

We consider a number of models where the main emphasis is on the effects of random environmental changes on system reliability. They include complex hardware and software systems which operate under some set of environmental states that affect the failure structure of all components. Our discussion will be of an expository nature and we will review mostly existing and ongoing research of the au...

During the last decade, funds to face humanitarian operations have increased approximately ten times. According to the Global Humanitarian Assistance Report, in 2013 the humanitarian funding requirement was by US$ 22 billion, which represents 27.2% more than the requested in 2012. Furthermore, the transportation cost represents between one third to twothirds from the total logistics cost. There...

Task variety is a familiar concept in organization theory and in job analysis. Standardized scales to measure task variety have been developed and shown to be reliable, but results reported here suggest that while these scales may measure the number of different tasks performed, they do not measure variety in work process. Comparing results from the standard, survey-based measures and detailed,...

Effective and accurate reliability modeling requires the collection of comprehensive, homogeneous, and consistent data sets. Failure data required for software reliability modeling is difficult to collect, and even the available data tends to be noisy, distorted and unpredictable. Also, the complexity of the real world data might obscure the properties of the reliability models which are based ...