This paper studies a facility location model with fuzzy random parameters and its swarm intelligence approach. A Value-at-Risk (VaR) based fuzzy random facility location model (VaR-FRFLM) is built in which both the costs and demands are assumed to be fuzzy random variables, and the capacity of each facility is unfixed but a decision variable assuming continuous values. Under this setting, the V...

Introduction. Today Continuous Medical Education is under consideration for graduated medical students as a necessity in today's world and has had its importance about one decade in our country (IRAN) . Methods. Recognition of opinions in various occupational actions of post graduated persons is very important in attention for reevaluation the program of continuous teaching in post graduated...

In this paper we consider a new class of continuous location problems where the ''distances'' are measured by gauges of closed (not necessarily bounded) convex sets. These distance functions do not satisfy the definiteness property and therefore they can be used to model those situations where there exist zero-distance regions. We prove a geometrical characterization of these measures of distan...

With the current advances of mobile computing technology, we are witnessing an explosion in the development of applications that provide mobile users with a wide range of services. Of special interest are those applications that exploit the particular features of mobile environments to provide the user with context-aware information. In particular, we focus on location-dependent queries, which ...

In this paper we deal with the location of extensive facilities on trees, both discrete and continuous, under the condition that existing facilities are already located. We require that the selected new server is a subtree, although we also specialize to the case of paths. We study the problem with the two most widely used criteria in Location Analysis: center and median. Our main results under...

We propose fast heuristics for large-scale covering-location problems in which the set of demand points is discrete and the set of potential location sites is continuous. These heuristics are compared on a set of 152 real-life instances arising in cytological screening. 2002 Elsevier Science Ltd. All rights reserved.

A new continuous location model is presented and embedded in the literature on robustness in facility location. The multimodality of the model is investigated, and a branch and bound method based on dc optimization is described. Numerical experience is reported, showing that the developed method allows one to solve in a few seconds problems with thousands of demand points.

Hybrid (discrete/continuous) systems are systems that exhibit both discrete state and continuous state dynamics. In addition, these two aspects of system behavior interact to such a significant extent that they cannot be decoupled and must be analyzed simultaneously. We consider the modeling, simulation and sensitivity analysis of hybrid systems, with particular emphasis on the interactions bet...