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Robust search policies against an intelligent evader

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Author
Lin, Kyle Y.
Singham, Dashi I.
Date
2015-11
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Abstract
In a classical search model, an object is hidden in one of many cells. Knowing the probability that the object is in each cell, a searcher wishes to find it. Each search in a cell incurs a cost and will discover the object with some probability, with both the cost and discovery probability dependent on the cell. This paper revisits this search problem with an intelligent evader who decides where to hide in order to evade the search. We make two contributions to the literature. First, we show how to compute a randomized policy for the searcher to minimize the expected cost until discovering the evader. Second, if the search has to stop at some point, with the deadline unannounced in advance, we show how the searcher can sequentially allocate each search to simultaneously maximize the probability of discovering the evader by an arbitrary deadline. In the case where the search cost is identical for all cells, our analysis shows that the latter policy is more robust.
Description
The previous version has a signature misplaced on Figure 1, which is corrected in this version.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/47573
NPS Report Number
NPS-OR-15-009
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  • All Technical Reports Collection
  • Faculty and Researchers' Publications
  • Operations Research (NPS-OR)

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