Documents disponibles écrits par cet auteur

A cover-based competitive location model / Drezner, T. in Journal of the operational research society (JORS), Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 1 (Janvier 2011) . - pp. 100–113 Titre : A cover-based competitive location model Type de document : texte imprimé Auteurs : Drezner, T., Auteur ; Z. Drezner, Auteur ; Kalczynski, P., Auteur Année de publication : 2011 Article en page(s) : pp. 100–113 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Location  Competitive  Cover  Lost  demand Index. décimale : 001.424 Résumé : In this paper we propose a new approach to estimating market share captured by competing facilities. The approach is based on cover location models. Each competing facility has a ‘sphere of influence’ determined by its attractiveness level. More attractive facilities have a larger radius of the sphere of influence. The buying power of a customer within the sphere of influence of several facilities is equally divided among the competing facilities. The buying power of a customer within the sphere of influence of no facility is lost. Assuming the presence of competition in the area, the objective is to add a number of new facilities to a chain of existing facilities in such a way that the increase of market share captured by the chain is maximized. The model is formulated and analysed. Optimal and heuristic solution algorithms are designed. Computational experiments demonstrate the effectiveness of the proposed algorithms. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n1/abs/jors2009153a.html [article] A cover-based competitive location model [texte imprimé] / Drezner, T., Auteur ; Z. Drezner, Auteur ; Kalczynski, P., Auteur . - 2011 . - pp. 100–113. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 1 (Janvier 2011) . - pp. 100–113 Mots-clés : Location  Competitive  Cover  Lost  demand Index. décimale : 001.424 Résumé : In this paper we propose a new approach to estimating market share captured by competing facilities. The approach is based on cover location models. Each competing facility has a ‘sphere of influence’ determined by its attractiveness level. More attractive facilities have a larger radius of the sphere of influence. The buying power of a customer within the sphere of influence of several facilities is equally divided among the competing facilities. The buying power of a customer within the sphere of influence of no facility is lost. Assuming the presence of competition in the area, the objective is to add a number of new facilities to a chain of existing facilities in such a way that the increase of market share captured by the chain is maximized. The model is formulated and analysed. Optimal and heuristic solution algorithms are designed. Computational experiments demonstrate the effectiveness of the proposed algorithms. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n1/abs/jors2009153a.html

Modelling lost demand in competitive facility location / Drezner, T. in Journal of the operational research society (JORS), Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 2 (Fevrier 2012) . - pp. 201–206 Titre : Modelling lost demand in competitive facility location Type de document : texte imprimé Auteurs : Drezner, T., Auteur ; Z. Drezner, Auteur Année de publication : 2012 Article en page(s) : pp. 201–206 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Facility  location  Competitive  Lost  demand  Elastic  demand Index. décimale : 001.424 Résumé : In this paper, we propose a simple new approach to model lost demand (also referred to as elastic demand) in competitive facility location. A ‘dummy’ competing facility that attracts the lost demand is added to the list of competing facilities. All competitive facility location models, regardless of their complexity or assumptions, can be modified to include lost demand and be solved by the same algorithms designed for standard models once the dummy facility is added to the data as an additional competitor. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n2/abs/jors201110a.html [article] Modelling lost demand in competitive facility location [texte imprimé] / Drezner, T., Auteur ; Z. Drezner, Auteur . - 2012 . - pp. 201–206. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 2 (Fevrier 2012) . - pp. 201–206 Mots-clés : Facility  location  Competitive  Lost  demand  Elastic  demand Index. décimale : 001.424 Résumé : In this paper, we propose a simple new approach to model lost demand (also referred to as elastic demand) in competitive facility location. A ‘dummy’ competing facility that attracts the lost demand is added to the list of competing facilities. All competitive facility location models, regardless of their complexity or assumptions, can be modified to include lost demand and be solved by the same algorithms designed for standard models once the dummy facility is added to the data as an additional competitor. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n2/abs/jors201110a.html

Strategic competitive location / Drezner, T. in Journal of the operational research society (JORS), Vol. 63 N° 12 (Décembre 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 12 (Décembre 2012) . - pp. 1720–1730 Titre : Strategic competitive location : improving existing and establishing new facilities Type de document : texte imprimé Auteurs : Drezner, T., Auteur ; Z. Drezner, Auteur ; Kalczynski, P., Auteur Année de publication : 2013 Article en page(s) : pp. 1720–1730 Note générale : operational research Langues : Anglais (eng) Mots-clés : facility  location;  competitive  location;  cover  models Index. décimale : 001.424 Résumé : Competitive facility location models consider two main strategies for increasing the market share captured by a chain subject to a budget constraint. One strategy is the improvement of existing facilities. The second strategy is the construction of new facilities. In this paper we analyse these two strategies as well as the joint strategy which is a combination of the two. All three strategies are formulated as a unified model. The best solution to an individual strategy is a feasible solution to the joint one. Therefore, the joint strategy must yield solutions that are at least as good as the solutions to each of the individual strategies. Based on the results of extensive experiments, we conclude that the increase in market share captured by a chain when the joint strategy is employed can be significantly higher than increases obtained by individual strategies. A branch and bound procedure and a tabu search heuristic are constructed for the solution of the unified model. Both algorithms performed very well on a set of test problems with up to 900 demand points. A total of 62% of the test problems were optimally solved by the branch and bound procedure. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n12/abs/jors201216a.html [article] Strategic competitive location : improving existing and establishing new facilities [texte imprimé] / Drezner, T., Auteur ; Z. Drezner, Auteur ; Kalczynski, P., Auteur . - 2013 . - pp. 1720–1730. operational research Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 12 (Décembre 2012) . - pp. 1720–1730 Mots-clés : facility  location;  competitive  location;  cover  models Index. décimale : 001.424 Résumé : Competitive facility location models consider two main strategies for increasing the market share captured by a chain subject to a budget constraint. One strategy is the improvement of existing facilities. The second strategy is the construction of new facilities. In this paper we analyse these two strategies as well as the joint strategy which is a combination of the two. All three strategies are formulated as a unified model. The best solution to an individual strategy is a feasible solution to the joint one. Therefore, the joint strategy must yield solutions that are at least as good as the solutions to each of the individual strategies. Based on the results of extensive experiments, we conclude that the increase in market share captured by a chain when the joint strategy is employed can be significantly higher than increases obtained by individual strategies. A branch and bound procedure and a tabu search heuristic are constructed for the solution of the unified model. Both algorithms performed very well on a set of test problems with up to 900 demand points. A total of 62% of the test problems were optimally solved by the branch and bound procedure. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n12/abs/jors201216a.html

Strategic design of competing supply chain networks for inelastic demand / S. Rezapour in Journal of the operational research society (JORS), Vol. 62 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1784–1795 Titre : Strategic design of competing supply chain networks for inelastic demand Type de document : texte imprimé Auteurs : S. Rezapour, Auteur ; Reza Zanjirani Farahani, Auteur ; Drezner, T., Auteur Année de publication : 2011 Article en page(s) : pp. 1784–1795 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Supply  chains  Network  design  Mixed  integer  non-linear  programming  Static  competition Index. décimale : 001.424 Résumé : A model for designing the network of a new entrant supply chain under inelastic demand and in the presence of pre-existing competing chains is proposed. These supply chains provide an identical product for a market area. The model considers the location of distribution centres and retail outlets on a discrete set of potential locations. The assumptions of the model are: (1) static competition between the new and pre-existing chains and (2) a probabilistic customer behaviour based on an attraction function depending on both the location and the quality of the retailers. This model also incorporates the impact of the facilities’ location decisions on the operational inventory and shipment decisions. The resulting model is formulated as a mixed integer non-linear programme (MINLP). To solve the MINLP it is transformed to a linear one. We illustrate the model, discuss the results of a real-world case, and investigate the effectiveness of the proposed algorithm using randomly generated examples. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010146a.html [article] Strategic design of competing supply chain networks for inelastic demand [texte imprimé] / S. Rezapour, Auteur ; Reza Zanjirani Farahani, Auteur ; Drezner, T., Auteur . - 2011 . - pp. 1784–1795. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1784–1795 Mots-clés : Supply  chains  Network  design  Mixed  integer  non-linear  programming  Static  competition Index. décimale : 001.424 Résumé : A model for designing the network of a new entrant supply chain under inelastic demand and in the presence of pre-existing competing chains is proposed. These supply chains provide an identical product for a market area. The model considers the location of distribution centres and retail outlets on a discrete set of potential locations. The assumptions of the model are: (1) static competition between the new and pre-existing chains and (2) a probabilistic customer behaviour based on an attraction function depending on both the location and the quality of the retailers. This model also incorporates the impact of the facilities’ location decisions on the operational inventory and shipment decisions. The resulting model is formulated as a mixed integer non-linear programme (MINLP). To solve the MINLP it is transformed to a linear one. We illustrate the model, discuss the results of a real-world case, and investigate the effectiveness of the proposed algorithm using randomly generated examples. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010146a.html