Geoderma ◽  
2021 ◽  
Vol 402 ◽  
pp. 115154
Author(s):  
Clécia Cristina Barbosa Guimarães ◽  
José A. M. Demattê ◽  
Antônio Carlos de Azevedo ◽  
Ricardo Simão Diniz Dalmolin ◽  
Alexandre ten Caten ◽  
...  

2021 ◽  
Vol 11 (4) ◽  
pp. 1697
Author(s):  
Shi-Woei Lin ◽  
Tapiwa Blessing Matanhire ◽  
Yi-Ting Liu

While the dependence assumption among the components is naturally important in evaluating the reliability of a system, studies investigating the issues of aggregation errors in Bayesian reliability analyses have been focused mainly on systems with independent components. This study developed a copula-based Bayesian reliability model to formulate dependency between components of a parallel system and to estimate the failure rate of the system. In particular, we integrated Monte Carlo simulation and classification tree learning to identify key factors that affect the magnitude of errors in the estimation of posterior means of system reliability (for different Bayesian analysis approaches—aggregate analysis, disaggregate analysis, and simplified disaggregate analysis) to provide important guidelines for choosing the most appropriate approach for analyzing a model of products of a probability and a frequency for parallel systems with dependent components.


Author(s):  
Kevin Riehle

This book identifies 88 Soviet intelligence officers who defected from 1924 to 1954 and provides an aggregate analysis of their information to uncover Soviet strategic priorities and concerns. When intelligence officers defect, they take with them privileged information and often communicate it to the receiving state, and thereby they open a window into a closed national security decision making system. The book provides the most comprehensive list of Soviet intelligence officer defectors compiled to date representing a variety of specializations. Through the information they provided in now-declassified debriefings, documents they brought with them, and post-defection publications and public appearances, this book shows the evolution of Soviet threat perceptions and the development of the "main enemy" concept in the Soviet national security system. It also shows fluctuations in the Soviet recruitment and vetting of personnel for sensitive national security positions, corresponding with fluctuations in the stability of the Soviet government. The shifting motivations of these officers also reveals the pressures that they were experiencing at the time, leading to their choice to break with the Soviet Union.


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