Hub-and-spoke systems have wide applications ranging in airline transportation, freight transportation, urban traffic, postal delivery, telecommunications and distribution in supply chains. These systems are usually characterized by stochastic demand and congestion, which adversely affect the...

The advent of Just-in-Time (JIT) and Group Technology philosophies has popularized U- shaped assembly lines, which help overcome many of the disadvantages, like line inflexibility, job monotony, large inventories, etc., typically associated with straight assembly lines. Al- though U-shaped...

The bandwidth packing problem seeks to select and route a set of calls from a given list, each with a pre-specified requirement for bandwidth, on an undirected communication network such that the revenue generated is maximized. In this paper, we present a model and an exact solution approach for...

We consider a class of location-allocation problems with immobile servers, stochastic demand and congestion that arises in several planning contexts: location of emergency medical clinics; preventive healthcare centers; refuse collection and disposal centers; stores and service centers; bank...

We study a duopoly market in which customers are heterogeneous in their sensitivity to price and leadtime, and can be segmented as price sensitive or time sensitive. Each firm tailors (differentiates) its products/services for the two customer classes solely based on price and the corresponding...

Facility location problems reported in the literature generally assume the problem parameter values (like cost, budget, etc.) to be known with complete certainty, even if they change over time (as in multi-period versions). However, in reality, there may be some uncertainty about the exact...

We study the problem of locating Emergency Medical Service (EMS) facilities in the presence of service level constraints for patients with acuity levels ranging from resuscitation to non-urgent. Each patient arriving at any EMS facility is triaged as either resuscitation/high priority or less...

The Combinatorial bandwidth packing problem (CBPP), arising in a telecommunication network with limited bandwidth, is defined as: given a set of request, each with its potential revenue and consisting of calls with their bandwidth requirements, deciding (i) a subset of the requests to...

We consider a service system that serves one class of customers, which is willing to pay a premium for a faster delivery, with priority over the other class, which is more price sensitive but is willing to wait longer. The demand from one class depends not only on the price and delivery time...