Derek R. Atkins

Learn More
Motivated by dynamic scheduling control for queueing networks, Chen and Yao 8] developed a systematic method to generate dynamic scheduling control policies for a uid network, a simple and highly aggregated model that approximates the queueing network. This study addresses the question of how good these uid policies are as heuristic scheduling policies for(More)
This paper extends the theory of Q competitive newsvendors to the case where competition occurs simultaneously in both price and inventory. The basic research questions are whether the Nash equilibrium exists in this game, whether it is unique, and how the resulting inventories and prices are aected by competition. Using a novel method, we show the(More)
0 Abstract High surgical bed occupancy levels often result in heightened staff stress, frequent surgical cancellations and long surgical wait times. This congestion is in part attributable to surgical scheduling practices which often focus on the efficient use of operating rooms but ignore resulting downstream bed utilization. This paper describes a(More)
This paper describes a methodology for setting long-term care capacity levels over a multi-year planning horizon, to achieve target wait time service levels. Our approach integrates demographic and survival analysis, discrete event simulation, and optimization. Based on this methodology, a decision support system was developed for use in practice. We(More)
This paper is based on observations that competing retailers have the option of either agreeing in advance to transship excess inventory to each other or seeing unsatisfied customers switch to the competitor for a substitute. A transshipment game and a substitution game between competing retailers is studied. After establishing the existence and uniqueness(More)
When customers for a product from N substitutable alternatives find their first choice sold out, they might " spill " to their second-most preferred products. The existing literature typically assumes an exogenous spill rate. We develop a surprisingly simple model that links the spill rate to economic factors associated with direct demand systems.