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Application of heuristic search and information theory to sequential fault diagnosis

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2 Author(s)
Pattipati, K.R. ; Alphatech Inc., Burlington, MA, USA ; Alexandridis, Mark G.

The problem of constructing optimal and near-optimal test sequences to diagnose permanent faults in electronic and electromechanical systems is considered. The test sequencing problem is formulated as an optimal binary AND/OR decision tree construction problem, whose solution is known to be NP-complete. The approach used is based on integrated concepts from information theory and heuristic AND/OR graph search methods to subdue the computational explosion of the optimal test-sequencing problem. Lower bounds on the optimal cost-to-go from the information-theoretic concepts of Huffman coding and entropy are derived. These lower bounds ensure that an optimal solution is found using the heuristic AND/OR graph search algorithms; they have made it possible to obtain optimal test sequences to problems that are intractable with traditional dynamic programming techniques. In addition, a class of test-sequencing algorithms that provide a tradeoff between solution quality and complexity have been derived using the ε-optimal and limited search strategies

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Systems, Man and Cybernetics, IEEE Transactions on  (Volume:20 ,  Issue: 4 )