Browsing by Author "ReVelle, C"

Now showing 1 - 4 of 4
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    Anticoverage models for obnoxious material transportation
    (PION LTD, 2002) Marianov, V; ReVelle, C; Shih, S
    We present models for the design of routes for transportation of loads that might become hazardous or obnoxious to the population living along these routes. We take into consideration the fact that the values of the properties that are close to the roads used for the transportation may decrease as a consequence of this activity. As opposed to the traditional approach, of minimizing the population along the routes, we propose to include a compensation cost as a direct cost of choosing the routes. This compensation could include, for instance, a reduction in property tax rates. Two formulations are presented, covering different patterns of effects on property values. As an example of application of the models, we provide some computational experience.
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    Linear, non-approximated models for optimal routing in hazardous environments
    (STOCKTON PRESS, 1998) Marianov, V; ReVelle, C
    A linear optimisation model is presented for the routing of vehicles through hazardous environments or for routing vehicles carrying hazardous materials. The model seeks to find the route with the minimum cost and the minimum probability of accident. As opposed to previously published models, the formulation is linear and no approximations are needed, even in the case of high risk. Several forms of considering risk are presented, as well as a simple method of solution in polynomial time. An example is shown and solved.
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    Location of hubs in a competitive environment
    (ELSEVIER SCIENCE BV, 1999) Marianov, V; Serra, D; ReVelle, C
    We offer a formulation that locates hubs on a network in a competitive environment; that is, customer capture is sought, which happens whenever the location of a new hub results in a reduction of the current cost (time, distance) needed by the traffic that goes from the specified origin to the specified destination. The formulation presented here reduces the number of variables and constraints as compared to existing covering models. This model is suited for both air passenger and cargo transportation. In this model, each origin-destination flow can go through either one or two hubs, and each demand point can be assigned to more than a hub, depending on the different destinations of its traffic. Links ("spokes") have no capacity limit. Computational experience is provided. (C) 1999 Elsevier Science B.V. AU rights reserved.
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    Trading off species protection and timber production in forests managed for multiple objectives
    (SAGE PUBLICATIONS LTD, 2004) Marianov, V; Snyder, S; ReVelle, C
    We address a multiobjective forest-management problem that maximizes harvested timber volume and maximizes the protection of species through the selection of protected habitat reserves. As opposed to reserving parcels of the forest for general habitat purposes, as most published works do, the model we present, and its several variants, concentrate on the preservation status of each one of the species living in the forest under study. Thus, all of the formulations we propose trade off harvested timber volume against the weighted number of preserved species. Each formulation represents a different management policy. Casting the models in a static setting allows us to analyze the effect of several management policies through computational experience with different forest-stucture-species relationships.