In this paper, we construct a generalized network oligopoly model with arc multipliers for supply chains of pharmaceutical products using variational inequality theory. The model captures the Cournot competition among the manufacturers who seek to determine their profit-maximizing product flows,...

This paper presents a tour-chain-based approach to modeling urban commercial vehicle daily activity patterns. A daily tour chain refers to a sequence of daily tours made by a vehicle. Multinomial logit model results demonstrate that urban daily tour-chain choice is a result of collective...

A mixed integer stochastic programming model is established to support strategic planning of bioenergy supply chain systems and optimal feedstock resource allocation in an uncertain decision environment. The two-stage stochastic programming model, together with a Lagrange relaxation based...

This paper tests the mutual forbearance view in the context of airline alliances in the international air travel market. Using passenger booking and airfare data on transpacific routes, we find consistent evidence for the positive association between multimarket contact and airfares. Our results...

Hierarchical multimodal hub location problem is a cost-minimizing hub covering problem where two types of hubs and hub links, accounting for ground and air transportation, are to be established, while ensuring time-definite deliveries. We propose a mixed-integer programming formulation and...

This paper analyzes the safety performance differences between union and non-union motor carriers. Based primarily on the safety and health provisions of a national agreement between the International Brotherhood of Teamsters and a major unionized motor carrier, a hypothesis is developed that...

We propose a bi-objective optimization framework for routing rail-truck intermodal shipments with hazardous materials, when shippers and receivers have access to alternate intermodal terminals. A tabu-search based solution methodology is developed, which together with the optimization framework...

This study examines the short- and long-run effects of various determinants on the demand for US air passenger-services using the Johansen cointegration analysis and a vector error-correction (VEC) model. Results show that, in the long-run, airfare, disposable income and NASDAQ have significant...

This paper addresses the deterministic dynamic single carrier collaboration problem for the small- to medium-sized less-than-truckload (LTL) industry. It is formulated as a binary (0–1) multi-commodity minimum cost flow problem and solved using a branch-and-cut algorithm. Its inherent network...

Tactical crew capacity planning problem in railways involves finding the minimum number of crews in a region required to operate a predetermined set of train duties satisfying the strict day-off requirement for crew. For the single-region problem, we develop two solution approaches based on a...