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In this paper we introduce a robust optimization approach to solve the Vehicle Routing Problem (VRP) with demand uncertainty. This approach yields routes that minimize transportation costs while satisfying all demands in a given bounded uncertainty set. We show that for the Miller-Tucker-Zemlin formulation of the VRP and specific uncertainty sets, solving(More)
Research on facility location is abundant. However, this research does not typically address the particular conditions that arise when locating facilities to service large-scale emergencies, such as earthquakes, terrorist attacks, etc. In this work we first survey general facility location problems and identify models used to address common emergency(More)
Although ridesharing can provide a wealth of benefits, such as reduced travel costs, congestion, and consequently less pollution, there are a number of challenges that have restricted its widespread adoption. In fact, even at a time when improving communication systems provide real-time detailed information that could be used to facilitate ridesharing, the(More)
Some important issues in the design of an efficient pharmaceutical supply chain involve deciding where to place the warehouses/inventories and how to route distribution vehicles. Solving appropriate facility location and vehicle routing problems can ensure the design of a logistic network capable of rapid distribution of medical supplies. In particular,(More)
ii ABSTRACT In certain types of fleet systems, the environmental impacts of fleet operation are, to some extent, a controllable function of vehicle routing and scheduling decisions. However, there has been little prior work that has considered environmental impacts in fleet vehicle routing and scheduling optimization, in particular, where the impacts were(More)
Over the past 10 years, operating expenses for Demand Responsive Transit (DRT) have more than doubled as demand for this mandated service has expanded. The DRT systems that we studied consist of dial–a–ride programs that transit agencies use for point–to–point pickup and delivery of the elderly and handicapped. Many advanced technologies and management(More)
This research was conducted to organize and model a comprehensive paratransit dispatching task activity in a computer-assisted control room. The dispatching task involves continuous monitoring and interaction with archived and real-time data using a dispatch software. Extensive field observations and video recordings of dispatch operations were conducted.(More)
Satellite systems to provide terrestrial surface coverage are currently optimized by independently optimizing parts of the system or by locally starting at a " baseline " configuration and making small changes. Even when using a " baseline " the various components such as constellation configuration, satellite design, and acquisition have generally been(More)
We consider the problem of determining the allocation of demand from different customer orders to production batches and the schedule of resulting batches to minimize the total weighted earliness and tardiness penalties in context of batch chemical processing. The problem is formulated as a mixed-integer nonlinear programming model. An iterative heuristic(More)