In political districting problems, the aim is to partition a territory into electoral constituencies, subject to some side constraints. The most common side constraints include contiguity, populationâ€¦ (More)

In this paper, we consider the problem of network design for hazardous material transportation where the government designates a network, and the carriers choose the routes on the network. We modelâ€¦ (More)

We describe an ambulance location optimization model that minimizes the number of ambulances needed to provide a specified service level. The model measures service level as the fraction of callsâ€¦ (More)

The network design problem with relays (NDPR) is defined on an undirected graph G = (V,E,K), where V = {1, . . . ,n} is a vertex set, E = {(i, j) : i, j 2 V, i < j} is an edge set. The set K =â€¦ (More)

We study several functions that have been proposed for comparing transport routes for a hazardous materials shipment. We show that many proposed path evaluation functions are based on anâ€¦ (More)