We consider a probabilistic set covering problem where there is uncertainty regarding whether a selected set can cover an item, and the objective is to determine a minimum-cost combination of sets so that each item is covered with a pre-specified probability. To date, literature on this problem has focused on the special case in which uncertainties are independent. In this paper, we formulate conservative deterministic mixed-integer programming models for probabilistic set covering problems with correlated uncertainties. By exploiting the supermodularity properties of the probabilistic covering constraints and analyzing their polyhedral structure, we develop strong valid inequalities to strengthen the formulations. Computational results illustrate that our modeling approach outperforms formulations in which correlations are ignored and that our algorithms can significantly reduce overall computation time.
Citation
Georgia Institute of Technology, ISyE Technical Report, July 2011