Some Aspects about Vagueness & Imprecision in Computer Network Fault-Tree Analysis

Daniela Elena Popescu, Madalina Lonea, Doina Zmaranda, Codruta Vancea, Cristian Tiurbe


Based on the available information (eg.multiple functional faults or sensor errors give rise to similar alarm patterns or outcomes), some states in the behaviour of a network can not be distinguished from one another. So, the computer network’s fault tree reliability analysis frequently relies on imprecise or vague input data. The paper will use a Dempster-Shafer Theory to accommodate this vagueness and it will show how imprecision can give rise to false-negative, and false-positive inferences; there will be assigned upper and lower bounds for the probability on elements of the state space. After illustrating the computational simplicity of incorporating the Dempster-Shafer Theory probability assignments, we will apply them for analyzing the reliability of the network of our department.


reliability analysis, networks, Dempster-Shafer Theory, fault tree

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