Browsing by Subject "Facility location"

Now showing 1 - 9 of 9

Open Access
A bilevel uncapacitated location/pricing problem with Hotelling access costs in one-dimensional space
(International Conference on Information Systems, Logistics and Supply Chain, 2016) Arbib, C.; Pınar, Mustafa Ç.; Tonelli, M.
We formulate a spatial pricing problem as bilevel non-capacitated location: a leader first decides which facilities to open and sets service prices taking competing offers into account; then, customers make individual decisions minimizing individual costs that include access charges in the spirit of Hotelling. Both leader and customers are assumed to be risk-neutral. For non-metric costs (i.e., when access costs do not satisfy the triangle inequality), the problem is NP-hard even if facilities can be opened at no fixed cost. We describe an algorithm for solving the Euclidean 1-dimensional case (i.e., with access cost defined by the Euclidean norm on a line) with fixed opening costs and a single competing facility.
Open Access
An exact algorithm for the capacitated vertex p-center problem
(Elsevier, 2006) Özsoy, F. A.; Pınar, M. Ç.
We develop a simple and practical exact algorithm for the problem of locating p facilities and assigning clients to them within capacity restrictions in order to minimize the maximum distance between a client and the facility to which it is assigned (capacitated p-center). The algorithm iteratively sets a maximum distance value within which it tries to assign all clients, and thus solves bin-packing or capacitated concentrator location subproblems using off-the-shelf optimization software. Computational experiments yield promising results.
Open Access
Humanitarian facility location under uncertainty: Critical review and future prospects
(Elsevier, 2021-01-08) Dönmez, Zehranaz; Yetiş Kara, Bahar; Karsu, Özlem; Saldanha-da-Gama, F.
This paper provides a comprehensive review of the research done on facility location problems under uncertainty in a humanitarian context. The major goal is to summarize and help structuring this topic, which has increasingly attracted the attention of the scientific community. The literature is reviewed from different perspectives namely, in terms of the type of facilities involved, the decisions to make, the criteria to optimize, the paradigm used for capturing uncertainty, and the solution method adopted. The detailed analysis provided in the manuscript also contributes to identifying the distinguishing features of the problems in the topic. An outcome of the state-of-the-art presented is the identification of the current research trends, expectations and holes in the existing knowledge thus highlighting relevant research directions.
Open Access
An integrated evaluation of facility location, capacity acquisition, and technology selection for designing global manufacturing strategies
(Elsevier BV, 1992) Verter, Vedat; Dincer, Mehmet Cemal
Emergence of global markets enhanced the emergence of global firms which have plants in different countries and implement an integrated management style. Due to the intensive competition in global markets, manufacturing performance is conceived as an important strategic weapon. Facility location, capacity acquisition and technology selection decisions constitute means to implement manufacturing strategies. We review the literature in order to contribute to a better understanding of global manufacturing strategies. As a result we observe that an integrated analysis of the location, capacity and technology decisions is vital for the design of effective global manufacturing strategies.
Open Access
Multifacility location with imprecise data
(1994) Demir, Muhittin Hakan
Locational decisions often suffer from lack of precise data. In this study, we consider a class of multifacility location problems where the demands of existing and new facilities are unknown, with a known set of possible realizations. The set may be finite or infinite. In the latter case, the data is assumed to be of interval type. We use various criteria to evaluate candidate solutions to these problems and build a framework for decision making.
Open Access
A new model for the hazardous waste location-routing problem
(Elsevier, 2007) Alumur, S.; Kara, B. Y.
Hazardous waste management involves the collection, transportation, treatment and disposal of hazardous wastes. In this paper a new multiobjective location-routing model is proposed. Our model also includes some constraints, which were observed in the literature but were not incorporated into previous models. The aim of the proposed model is to answer the following questions: where to open treatment centers and with which technologies, where to open disposal centers, how to route different types of hazardous waste to which of the compatible treatment technologies, and how to route waste residues to disposal centers. The model has the objective of minimizing the total cost and the transportation risk. A large-scale implementation of the model in the Central Anatolian region of Turkey is presented.
Open Access
Relationship between familiarity, attitudes and preferences: assisted living facilities as compared to nursing homes
(Springer Netherlands, 2006-11) Imamoğlu Ç.; Imamoğlu, E. O.
In this paper, the authors aim to (a) explore attitudes toward and preferences for living in the newly emerging place type of assisted living facilities in comparison to nursing homes, and (b) assess the possible impact of familiarity on those attitudes and preferences. Ninety-eight respondents (with a mean age of 62) were surveyed. Respondents were found to be more favorable toward assisted living facilities than nursing homes. A three-factor model was proposed in which attitudes mediated between familiarity and preferences. Increased familiarity seemed to predict enhanced favorable attitudes in the case of assisted living facilities, as opposed to unfavorable attitudes in the case of nursing homes. However, positive attitudes seemed to predict preferences for living in either place type. Results are discussed with regards to the literature on the mere exposure effect and long-term care for older adults.
Open Access
A spanning tree approach to the absolute p-center problem
(Elsevier, 1998) Bozkaya, B.; Tansel, B.
We consider the absolute p-center problem on a general network and propose a spanning tree approach which is motivated by the fact that the problem is NP-hard on general networks but solvable in polynomial time on trees. We first prove that every connected network possesses a spanning tree whose p-center solution is also a solution for the network under consideration. Then we propose two classes of spanning trees that are shortest path trees rooted at certain points of the network. We give an experimental study, based on 1440 instances, to test how often these classes of trees include an optimizing tree. We report our computational results on the performance of both types of trees. © 1999 Elsevier Science Ltd. All rights reserved.
Open Access
A unified model for hazardous waste management problem : application in Turkey
(2003) Emek, Evren
In real life a number of institutions, typically with conflicting objectives, are affected from the hazardous waste management problem. We investigate all related issues in the hazardous waste management from each institution’s perspective. We define the hazardous waste management problem as the combined decisions of selecting the disposal method, siting the selected disposal plant, deciding on the waste flow structure and satisfying any other criteria required by any of the interested institutions. We develop a new unified mathematical model. In order to satisfy law and legislation requirements the incorporation of the Gaussian plume model into our unified model is also accomplished. A large scale implementation into regions of Turkey is provided.