Publications of Sara Mattia

This page shows all publications that appeared in the IASI annual research reports. Authors currently affiliated with the Institute are always listed with the full name.

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IASI Research Report n. 18-14  (Previous    Next)


Sara Mattia

ROUNDING HEURISTICS FOR THE EDGE ACTIVATION PROBLEM

ABSTRACT
The Capacitated Edge Activation (CEA) problem consists of activating a minimum cost set of capacitated edges to ensure the routing of some traffic demands. Most of the MIP-based heuristics proposed for network design problems are based on the so-called flow formulation, that includes both activation and routing variables. Indeed, there also exists a capacity formulation, that includes only activation variables. This formulation is, however, non-compact. Here we investigate the price to pay to use the non-compact capacity formulation instead of the compact flow formulation in a MIP-based rounding heuristic for the CEA problem. Both splittable and unsplittable flows are considered. The experiments show that, indeed, the capacity formulation requires more time and solves less instances than the flow formulation, due to the time spent in separating feasibility cuts, in particular for unsplittable flows.
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