In this paper we introduce a new facility location model, called backup multifacility location problem by considering the ideal radius for each customer. In this problem the location of clients are given in the plane. A radius is assigned to each client. We should find the location of new facilities, which some of them may fail with a given probability, such that the sum of weighted distances f...

in this paper the conditional location problem is discussed. conditional location problems have a wide range of applications in location science. a new meta-heuristic algorithm for solving conditional p-median problems is proposed and results are compared to those of the previous studies. this algorithm produces much better results than the previous formulations.

Managing a technology portfolio is one of the great challenges for sustained success, especially in high-technology industries where technologies can be a major selling point. For engineers, this portfolio is more of a toolbox for solving design problems, but in large organizations there can be so many technologies used in different business areas that even the engineers may not be aware of all...

We present experiences from using the EcoClass life cycle assessment tool in participatory product development. EcoClass is designed as an easily accessible, user-friendly tool providing data on three emissions categories during production and utilization of urban transport vehicles. In contrast to most other LCA models, EcoClass allows online modifications of vehicle utilization parameters to ...

Time adverbials introduced by until impose restrictions on the aspectual class of the main clause they combine with: they only combine with durative sentences. In negative sentences, the situation is more complex. The question arises whether negative sentences are durative, or whether there is a separate use of until as a negative polarity item. In this paper, I discuss the three treatments of ...

Background. The question whether old media are driven out of existence by new media has been a long concern in academic and industrial research but has received no definitive answer. Aim. This paper goes beyond most previous studies of Internet impact on traditional media, which have placed their relationship within a competitionbased framework, to specifically investigate the complementary eff...

the link between location features and the propensity to start a new firm is a subject that did not get much attention in iran until recently. this paper is the first attempt on this proposition and is concerned with deliberating the effect of demographical and industrial characteristics of location on start-up rates in iranian manufacturing industries. to fulfill this aim, regional panel data ...

this paper proposes a bi-objective model for the facility location problem under a congestion system. the idea of the model is motivated by applications of locating servers in bank automated teller machines (atms), communication networks, and so on. this model can be specifically considered for situations in which fixed service facilities are congested by stochastic demand within queueing frame...