Finding Faults with Uncertain Assumptions
Keppens, J. and Shen, Q.
Proceedings of the International Workshop on Principles of Diagnosis. 197-203.
July 1998
Abstract
The General Diagnostic Engine (GDE) postulates plausible faults from
given measurements by making extensive use of an Assumption based Truth
Maintenance System (ATMS). However, it relies upon an entropy-based
uncertainty calculus, separate from the ATMS, to compute optimal
locations for measurements gathering. The practical usability of GDE is
thus restricted by the
statistical information required and by the strong assumptions necessary
for making subsequent simplifications. In this paper, a simple numeric
certainty calculus is integrated with the ATMS. The integrated ATMS,
capable of handling uncertain assumptions, is employed as the unified
basis upon which to guide the measurements gathering process of the
dependent diagnostic engine. This enables finding faults in uncertain
environments, while reducing restrictive assumptions on component
failures.
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