Dépouillements

Optimizing vehicle routes in a bakery company allowing flexibility in delivery dates / Pacheco, J. in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 569–581 Titre : Optimizing vehicle routes in a bakery company allowing flexibility in delivery dates Type de document : texte imprimé Auteurs : Pacheco, J., Auteur ; A. Alvarez, Auteur ; I. García, Auteur Année de publication : 2012 Article en page(s) : pp. 569–581 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : VRP  with  flexibility  in  delivery  Metaheuristics  GRASP  Path  relinking Index. décimale : 001.424 Résumé : The work addressed in this paper is motivated from a real problem proposed to the authors by a bakery company in Northern Spain. The objective is to minimize the total distance travelled for the daily routes over the week. In order to reduce this total distance, some flexibility in the dates of delivery is introduced. A mixed-integer linear model for the problem is formulated. In addition, a two-phase method based in GRASP and path-relinking metaheuristic strategies is proposed. Computational experiments show that the method performs very well, obtaining high-quality solutions in short computational times. Moreover, when it is applied to real-data-based instances, the obtained solutions considerably reduce transportation costs over the planning horizon. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201151a.html [article] Optimizing vehicle routes in a bakery company allowing flexibility in delivery dates [texte imprimé] / Pacheco, J., Auteur ; A. Alvarez, Auteur ; I. García, Auteur . - 2012 . - pp. 569–581. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 569–581 Mots-clés : VRP  with  flexibility  in  delivery  Metaheuristics  GRASP  Path  relinking Index. décimale : 001.424 Résumé : The work addressed in this paper is motivated from a real problem proposed to the authors by a bakery company in Northern Spain. The objective is to minimize the total distance travelled for the daily routes over the week. In order to reduce this total distance, some flexibility in the dates of delivery is introduced. A mixed-integer linear model for the problem is formulated. In addition, a two-phase method based in GRASP and path-relinking metaheuristic strategies is proposed. Computational experiments show that the method performs very well, obtaining high-quality solutions in short computational times. Moreover, when it is applied to real-data-based instances, the obtained solutions considerably reduce transportation costs over the planning horizon. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201151a.html

Multisourcing suppliers selection in service outsourcing / B. Feng in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 582–596 Titre : Multisourcing suppliers selection in service outsourcing Type de document : texte imprimé Auteurs : B. Feng, Auteur Année de publication : 2012 Article en page(s) : pp. 582–596 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Decision  analysis  Outsourcing  Different  formats  of  preference  information  Bi-objective  0–1  programming Index. décimale : 001.424 Résumé : Multisourcing suppliers selection in service outsourcing involves selecting a supplier portfolio with a reasonable number of suppliers and better performance to cover aspiration levels of criteria. It is a specific weighted matching problem with new challenges. This paper proposes a decision method for solving this problem. In the proposed method, different formats of preference information, including numerical values, interval numbers and linguistic variables, are used to express alternative ratings. The technique for order preference by similarity to ideal solution is extended to aggregate the three formats of preference information. A bi-objective 0–1 linear programming model using the aggregated information is built to select a desired supplier portfolio, in which the objectives of minimization of suppliers number and maximization of supplier performance are involved. To solve this model, we transform it into an equivalent, and then an exact multi-objective branch-and-bound algorithm is developed to obtain Pareto-optimal solutions. In addition, a real case of an insurance company is used to illustrate the applicability of the proposed method. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201161a.html [article] Multisourcing suppliers selection in service outsourcing [texte imprimé] / B. Feng, Auteur . - 2012 . - pp. 582–596. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 582–596 Mots-clés : Decision  analysis  Outsourcing  Different  formats  of  preference  information  Bi-objective  0–1  programming Index. décimale : 001.424 Résumé : Multisourcing suppliers selection in service outsourcing involves selecting a supplier portfolio with a reasonable number of suppliers and better performance to cover aspiration levels of criteria. It is a specific weighted matching problem with new challenges. This paper proposes a decision method for solving this problem. In the proposed method, different formats of preference information, including numerical values, interval numbers and linguistic variables, are used to express alternative ratings. The technique for order preference by similarity to ideal solution is extended to aggregate the three formats of preference information. A bi-objective 0–1 linear programming model using the aggregated information is built to select a desired supplier portfolio, in which the objectives of minimization of suppliers number and maximization of supplier performance are involved. To solve this model, we transform it into an equivalent, and then an exact multi-objective branch-and-bound algorithm is developed to obtain Pareto-optimal solutions. In addition, a real case of an insurance company is used to illustrate the applicability of the proposed method. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201161a.html

An adaptive search for the response time variability problemstar / Samir Salhi in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 597–605 Titre : An adaptive search for the response time variability problemstar Type de document : texte imprimé Auteurs : Samir Salhi, Auteur ; A. García-Villoria, Auteur Année de publication : 2012 Article en page(s) : pp. 597–605 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Response  time  variability  Heuristics  Adaptive  search  Scheduling  Fair  sequences Index. décimale : 001.424 Résumé : The Response Time Variability Problem (RTVP) is an NP-hard combinatorial scheduling problem, which has recently been reported and formalised in the literature. This problem has a wide range of real-world applications in mixed-model assembly lines, multi-threaded computer systems, broadcast of commercial videotapes and others. The RTVP arises whenever products, clients or jobs need to be sequenced in such a way that the variability in the time between the points at which they receive the necessary resources is minimised. We propose a greedy but adaptive heuristic that avoids being trapped into a poor solution by incorporating a look ahead strategy suitable for this particular scheduling problem. The proposed heuristic outperforms the best existing methods, while being much faster and easier to understand and to implement. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201146a.html [article] An adaptive search for the response time variability problemstar [texte imprimé] / Samir Salhi, Auteur ; A. García-Villoria, Auteur . - 2012 . - pp. 597–605. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 597–605 Mots-clés : Response  time  variability  Heuristics  Adaptive  search  Scheduling  Fair  sequences Index. décimale : 001.424 Résumé : The Response Time Variability Problem (RTVP) is an NP-hard combinatorial scheduling problem, which has recently been reported and formalised in the literature. This problem has a wide range of real-world applications in mixed-model assembly lines, multi-threaded computer systems, broadcast of commercial videotapes and others. The RTVP arises whenever products, clients or jobs need to be sequenced in such a way that the variability in the time between the points at which they receive the necessary resources is minimised. We propose a greedy but adaptive heuristic that avoids being trapped into a poor solution by incorporating a look ahead strategy suitable for this particular scheduling problem. The proposed heuristic outperforms the best existing methods, while being much faster and easier to understand and to implement. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201146a.html

A novel heuristic approach to determine compromise management for end-of-life electronic products / S. C. Lee in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 606–619 Titre : A novel heuristic approach to determine compromise management for end-of-life electronic products Type de document : texte imprimé Auteurs : S. C. Lee, Auteur ; L. H. Shih, Auteur Année de publication : 2012 Article en page(s) : pp. 606–619 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : End-of-life  Environmental  load  Bi-criteria  optimization  Heuristic  approach  Compromise  programming Index. décimale : 001.424 Résumé : The European Union directive of Waste Electrical and Electronic Equipment for recycling end-of-life (EOL) products has had a significant impact on global enterprises. Recent studies have shed light on optimization of the EOL process. In addition to identifying the most economical EOL process, identifying the EOL process with the smallest environmental load is equally important, and this is thus a bi-criteria optimization problem. This study attempts to optimize EOL processes for electronic products based on a three-stage heuristic approach, which simultaneously minimizes cost and environmental impact. The proposed heuristic approach then assesses the most common disassembly and recycling processes by using the characteristics of electronic product recycling. Next, the best process for this bi-criteria optimization problem is identified by using the compromise programming method. The empirical analysis is based on data for notebook, and the potential impact on best EOL processes when notebook adopt new product designs is also discussed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201150a.html [article] A novel heuristic approach to determine compromise management for end-of-life electronic products [texte imprimé] / S. C. Lee, Auteur ; L. H. Shih, Auteur . - 2012 . - pp. 606–619. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 606–619 Mots-clés : End-of-life  Environmental  load  Bi-criteria  optimization  Heuristic  approach  Compromise  programming Index. décimale : 001.424 Résumé : The European Union directive of Waste Electrical and Electronic Equipment for recycling end-of-life (EOL) products has had a significant impact on global enterprises. Recent studies have shed light on optimization of the EOL process. In addition to identifying the most economical EOL process, identifying the EOL process with the smallest environmental load is equally important, and this is thus a bi-criteria optimization problem. This study attempts to optimize EOL processes for electronic products based on a three-stage heuristic approach, which simultaneously minimizes cost and environmental impact. The proposed heuristic approach then assesses the most common disassembly and recycling processes by using the characteristics of electronic product recycling. Next, the best process for this bi-criteria optimization problem is identified by using the compromise programming method. The empirical analysis is based on data for notebook, and the potential impact on best EOL processes when notebook adopt new product designs is also discussed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201150a.html

Team assignments and scheduling for the NCAA basketball tournament / S. H. Melouk in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 620–630 Titre : Team assignments and scheduling for the NCAA basketball tournament Type de document : texte imprimé Auteurs : S. H. Melouk, Auteur ; B. B. Keskin, Auteur Année de publication : 2012 Article en page(s) : pp. 620–630 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Sports  Integer  programming  Team  assignment  Scheduling  OR  applications Index. décimale : 001.424 Résumé : The National Collegiate Athletic Association (NCAA) organizes a men's basketball tournament every March to determine the national champion for the current season. In organizing the tournament, the emphasis is typically on selection of the most deserving teams to participate and providing a fair, equitable environment in which to play that result in a true, undisputed champion for the season. However, there are growing concerns of dwindling actual attendance at tournament games and increasing financial burden on the NCAA related to reimbursable team travel expenses. In this paper, we describe the development of an integer program designed to optimize team assignments in the sense of minimizing the distance travelled by teams to game sites and the corresponding travel costs. The goal is to increase tournament accessibility to fans as well as lessen the financial impact to the NCAA while maintaining the integrity of the tournament. We test our model against actual tournament assignments from the past 5 years. Results show consistent and significant cost savings and reductions in distance travelled without compromising the fairness and structure of the tournament. Overall, we demonstrate the usefulness of the model in both operational and strategic business decisions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201155a.html [article] Team assignments and scheduling for the NCAA basketball tournament [texte imprimé] / S. H. Melouk, Auteur ; B. B. Keskin, Auteur . - 2012 . - pp. 620–630. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 620–630 Mots-clés : Sports  Integer  programming  Team  assignment  Scheduling  OR  applications Index. décimale : 001.424 Résumé : The National Collegiate Athletic Association (NCAA) organizes a men's basketball tournament every March to determine the national champion for the current season. In organizing the tournament, the emphasis is typically on selection of the most deserving teams to participate and providing a fair, equitable environment in which to play that result in a true, undisputed champion for the season. However, there are growing concerns of dwindling actual attendance at tournament games and increasing financial burden on the NCAA related to reimbursable team travel expenses. In this paper, we describe the development of an integer program designed to optimize team assignments in the sense of minimizing the distance travelled by teams to game sites and the corresponding travel costs. The goal is to increase tournament accessibility to fans as well as lessen the financial impact to the NCAA while maintaining the integrity of the tournament. We test our model against actual tournament assignments from the past 5 years. Results show consistent and significant cost savings and reductions in distance travelled without compromising the fairness and structure of the tournament. Overall, we demonstrate the usefulness of the model in both operational and strategic business decisions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201155a.html

Performance comparison of retailing stores using a Malmquist-type index / C. B. Vaz in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 631–645 Titre : Performance comparison of retailing stores using a Malmquist-type index Type de document : texte imprimé Auteurs : C. B. Vaz, Auteur ; A. S. Camanho, Auteur Année de publication : 2012 Article en page(s) : pp. 631–645 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data  envelopment  analysis  Retail  Efficiency  Productivity  Malmquist  index  Statistical  tests Index. décimale : 001.424 Résumé : This study develops a framework that combines different management science methods to provide insights concerning the performance of retailing stores. First, the framework enables to specify appropriate targets for stores of a retail network using data envelopment analysis. This involves comparing stores within homogenous groups, that is, supermarkets and hypermarkets. Second, the framework compares the overall performance of these two groups. This requires the combined use of a Malmquist-type index and statistical tests. This index is decomposed into sub-indices for comparing the differences between groups in terms of the efficiency spread in each group of stores and the productivity differences between the best-practice frontiers spanned by the benchmark stores from each group. The hypothesis tests are used to verify if the differences between groups captured by the sub-indices are statistically significant. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201163a.html [article] Performance comparison of retailing stores using a Malmquist-type index [texte imprimé] / C. B. Vaz, Auteur ; A. S. Camanho, Auteur . - 2012 . - pp. 631–645. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 631–645 Mots-clés : Data  envelopment  analysis  Retail  Efficiency  Productivity  Malmquist  index  Statistical  tests Index. décimale : 001.424 Résumé : This study develops a framework that combines different management science methods to provide insights concerning the performance of retailing stores. First, the framework enables to specify appropriate targets for stores of a retail network using data envelopment analysis. This involves comparing stores within homogenous groups, that is, supermarkets and hypermarkets. Second, the framework compares the overall performance of these two groups. This requires the combined use of a Malmquist-type index and statistical tests. This index is decomposed into sub-indices for comparing the differences between groups in terms of the efficiency spread in each group of stores and the productivity differences between the best-practice frontiers spanned by the benchmark stores from each group. The hypothesis tests are used to verify if the differences between groups captured by the sub-indices are statistically significant. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201163a.html

The equal allocation policy in open shop batch scheduling / B. Mor in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 646–652 Titre : The equal allocation policy in open shop batch scheduling Type de document : texte imprimé Auteurs : B. Mor, Auteur ; Mosheiov, G., Auteur ; D. Oron, Auteur Année de publication : 2012 Article en page(s) : pp. 646–652 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Batch  scheduling  Open  shop  Makespan Index. décimale : 001.424 Résumé : We study the optimality of the very practical policy of equal allocation of jobs to batches in batch scheduling problems on an m-machine open shop. The objective is minimum makespan. We assume unit processing time jobs, machine-dependent setup times and batch availability. We show that equal allocation is optimal for a two-machine and a three-machine open shop. Although, this policy is not necessarily optimal for larger size open shops, it is shown numerically to produce very close-to-optimal schedules. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201164a.html [article] The equal allocation policy in open shop batch scheduling [texte imprimé] / B. Mor, Auteur ; Mosheiov, G., Auteur ; D. Oron, Auteur . - 2012 . - pp. 646–652. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 646–652 Mots-clés : Batch  scheduling  Open  shop  Makespan Index. décimale : 001.424 Résumé : We study the optimality of the very practical policy of equal allocation of jobs to batches in batch scheduling problems on an m-machine open shop. The objective is minimum makespan. We assume unit processing time jobs, machine-dependent setup times and batch availability. We show that equal allocation is optimal for a two-machine and a three-machine open shop. Although, this policy is not necessarily optimal for larger size open shops, it is shown numerically to produce very close-to-optimal schedules. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201164a.html

An evaluation of technical efficiency and managerial correlates of solid waste management by Welsh SMEs using parametric and non-parametric techniques / J. J. Cordeiro in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 653–664 Titre : An evaluation of technical efficiency and managerial correlates of solid waste management by Welsh SMEs using parametric and non-parametric techniques Type de document : texte imprimé Auteurs : J. J. Cordeiro, Auteur ; J. Sarkis, Auteur ; D. Vazquez-Brust, Auteur Année de publication : 2012 Article en page(s) : pp. 653–664 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Small  and  medium  sized  enterprises  Environmental  performance  Stochastic  frontier  analysis  DEA Index. décimale : 001.424 Résumé : Strong economic growth and environmental regulation stimulus make Welsh small and medium enterprises' (SMEs) sustainability performance merit investigation in the context of European Union (EU) sustainability initiatives. This is due in part to strong economic growth and the stimulus provided by environmental regulation. We use stochastic frontier analysis, a parametric econometric technique to generate estimates of the technical efficiency of solid waste management by 299 Welsh SMEs in 2003. We demonstrate that the ranking and efficiency scores of the Welsh SMEs studied correlate significantly with non-parametric data envelopment analysis efficiency measures and are related to the use of environmental auditing practices and the use of local business support groups, but not to monitoring of waste expenditures and publication of environmental policies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201122a.html [article] An evaluation of technical efficiency and managerial correlates of solid waste management by Welsh SMEs using parametric and non-parametric techniques [texte imprimé] / J. J. Cordeiro, Auteur ; J. Sarkis, Auteur ; D. Vazquez-Brust, Auteur . - 2012 . - pp. 653–664. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 653–664 Mots-clés : Small  and  medium  sized  enterprises  Environmental  performance  Stochastic  frontier  analysis  DEA Index. décimale : 001.424 Résumé : Strong economic growth and environmental regulation stimulus make Welsh small and medium enterprises' (SMEs) sustainability performance merit investigation in the context of European Union (EU) sustainability initiatives. This is due in part to strong economic growth and the stimulus provided by environmental regulation. We use stochastic frontier analysis, a parametric econometric technique to generate estimates of the technical efficiency of solid waste management by 299 Welsh SMEs in 2003. We demonstrate that the ranking and efficiency scores of the Welsh SMEs studied correlate significantly with non-parametric data envelopment analysis efficiency measures and are related to the use of environmental auditing practices and the use of local business support groups, but not to monitoring of waste expenditures and publication of environmental policies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201122a.html

Supply chain model for a deteriorating product with time-varying demand and production rate / B. C. Giri in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 665–673 Titre : Supply chain model for a deteriorating product with time-varying demand and production rate Type de document : texte imprimé Auteurs : B. C. Giri, Auteur ; T. Maiti, Auteur Année de publication : 2012 Article en page(s) : pp. 665–673 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Supply  chain  Vendor–buyer  Time-varying  demand  Deterioration  Process  shift Index. décimale : 001.424 Résumé : The paper develops a two-echelon supply chain model with a single-buyer and a single-vendor. The buyer sells a seasonal product over a short selling period and its inventory is subject to deterioration at a constant rate over time. The vendor's production rate is dependent on the buyer's demand rate, which is a linear function of time. Also, the vendor's production process is not perfectly reliable; it may shift from an in-control state to an out-of-control state at any time during a production run and produce some defective (non-conforming) items. Assuming that the vendor follows a lot-for-lot policy for replenishment made to the buyer, the average total cost of the supply chain is derived and an algorithm for finding the optimal solution is developed. The numerical study shows that the supply chain coordination policy is more beneficial than those policies obtained separately from the buyer's and the vendor's perspectives. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201154a.html [article] Supply chain model for a deteriorating product with time-varying demand and production rate [texte imprimé] / B. C. Giri, Auteur ; T. Maiti, Auteur . - 2012 . - pp. 665–673. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 665–673 Mots-clés : Supply  chain  Vendor–buyer  Time-varying  demand  Deterioration  Process  shift Index. décimale : 001.424 Résumé : The paper develops a two-echelon supply chain model with a single-buyer and a single-vendor. The buyer sells a seasonal product over a short selling period and its inventory is subject to deterioration at a constant rate over time. The vendor's production rate is dependent on the buyer's demand rate, which is a linear function of time. Also, the vendor's production process is not perfectly reliable; it may shift from an in-control state to an out-of-control state at any time during a production run and produce some defective (non-conforming) items. Assuming that the vendor follows a lot-for-lot policy for replenishment made to the buyer, the average total cost of the supply chain is derived and an algorithm for finding the optimal solution is developed. The numerical study shows that the supply chain coordination policy is more beneficial than those policies obtained separately from the buyer's and the vendor's perspectives. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201154a.html

Operations of online advertising services and publisher's option / A. Srinivasan in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 674–682 Titre : Operations of online advertising services and publisher's option Type de document : texte imprimé Auteurs : A. Srinivasan, Auteur ; C. Kwon, Auteur Année de publication : 2012 Article en page(s) : pp. 674–682 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Online  advertising  Nash  bargaining  game  Option  contract Index. décimale : 001.424 Résumé : We analyse the use of options for online advertisement publishers. By providing a discount or rewards to advertisers, publishers can utilise their uncertain service capacity, page-views, more efficiently. We use Generalised Nash Bargaining to study the feasibility of the option contract and solve for an optimal value for the option price. We compare the revenues and benefits from advertisements under the option contract, with those without the options using numerical studies. We also study the impact of pricing and other components in the game on the optimal option price, the publisher's revenues, and the advertiser's benefits from the advertisements. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201184a.html [article] Operations of online advertising services and publisher's option [texte imprimé] / A. Srinivasan, Auteur ; C. Kwon, Auteur . - 2012 . - pp. 674–682. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 674–682 Mots-clés : Online  advertising  Nash  bargaining  game  Option  contract Index. décimale : 001.424 Résumé : We analyse the use of options for online advertisement publishers. By providing a discount or rewards to advertisers, publishers can utilise their uncertain service capacity, page-views, more efficiently. We use Generalised Nash Bargaining to study the feasibility of the option contract and solve for an optimal value for the option price. We compare the revenues and benefits from advertisements under the option contract, with those without the options using numerical studies. We also study the impact of pricing and other components in the game on the optimal option price, the publisher's revenues, and the advertiser's benefits from the advertisements. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201184a.html

Job scheduling in virtual manufacturing cells with lot-streaming strategy: a new mathematical model formulation and a genetic algorithm approach / S. E. Kesen in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 683–695 Titre : Job scheduling in virtual manufacturing cells with lot-streaming strategy: a new mathematical model formulation and a genetic algorithm approach Type de document : texte imprimé Auteurs : S. E. Kesen, Auteur ; Z. Güngör, Auteur Année de publication : 2012 Article en page(s) : pp. 683–695 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling  Virtual  manufacturing  cells  (VMCs)  Flexible  job-shop  scheduling  problem  Lot-streaming  Integer  programming  Genetic  algorithms Index. décimale : 001.424 Résumé : This paper discusses the job scheduling problem in virtual manufacturing cells (VMCs) with the objective of makespan minimization. In the VMC scheduling problem, each job undergoes different processing routes and there is a set of machines to process any operation. Jobs are produced in lot and lot-streaming is permitted. In addition, machines are distributed through the facility, which raises the travelling time issue. For this reason, the decisions are machine assignments, starting times and sub-lot sizes of the operations. We develop a new Mixed Integer Linear Programming (MILP) formulation that considers all aspects of the problem. Owing to the intractability matter, it is unlikely that the MILP could provide solutions for big-sized instances within a reasonable amount of time. We therefore present a Genetic Algorithm (GA) with a new chromosome structure for the VMC environment. Based on a wide range of examinations, comparative results show that GA is quite favourable and that it obtains the optimum solution for any of the instances in the case where sub-lot number equals 1. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201186a.html [article] Job scheduling in virtual manufacturing cells with lot-streaming strategy: a new mathematical model formulation and a genetic algorithm approach [texte imprimé] / S. E. Kesen, Auteur ; Z. Güngör, Auteur . - 2012 . - pp. 683–695. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 683–695 Mots-clés : Scheduling  Virtual  manufacturing  cells  (VMCs)  Flexible  job-shop  scheduling  problem  Lot-streaming  Integer  programming  Genetic  algorithms Index. décimale : 001.424 Résumé : This paper discusses the job scheduling problem in virtual manufacturing cells (VMCs) with the objective of makespan minimization. In the VMC scheduling problem, each job undergoes different processing routes and there is a set of machines to process any operation. Jobs are produced in lot and lot-streaming is permitted. In addition, machines are distributed through the facility, which raises the travelling time issue. For this reason, the decisions are machine assignments, starting times and sub-lot sizes of the operations. We develop a new Mixed Integer Linear Programming (MILP) formulation that considers all aspects of the problem. Owing to the intractability matter, it is unlikely that the MILP could provide solutions for big-sized instances within a reasonable amount of time. We therefore present a Genetic Algorithm (GA) with a new chromosome structure for the VMC environment. Based on a wide range of examinations, comparative results show that GA is quite favourable and that it obtains the optimum solution for any of the instances in the case where sub-lot number equals 1. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201186a.html

On abduction / Ormerod, R. J. in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 696–697 Titre : On abduction : a response to Mingers Type de document : texte imprimé Auteurs : Ormerod, R. J., Auteur Année de publication : 2012 Article en page(s) : pp. 696–697 Langues : Anglais (eng) Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201188a.html [article] On abduction : a response to Mingers [texte imprimé] / Ormerod, R. J., Auteur . - 2012 . - pp. 696–697. Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 696–697 Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201188a.html

Response to ‘Note on “Effects of joint replenishment and channel coordination for managing multiple deteriorating products in a supply chain” ’ / J-M. Chen in Journal of the operational research society (JORS), Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 697–698 Titre : Response to ‘Note on “Effects of joint replenishment and channel coordination for managing multiple deteriorating products in a supply chain” ’ Type de document : texte imprimé Auteurs : J-M. Chen, Auteur ; T.-H. Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 697–698 Note générale : Recherche opérationnelle Langues : Anglais (eng) Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201189a.html [article] Response to ‘Note on “Effects of joint replenishment and channel coordination for managing multiple deteriorating products in a supply chain” ’ [texte imprimé] / J-M. Chen, Auteur ; T.-H. Chen, Auteur . - 2012 . - pp. 697–698. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 5 (Mai 2012) . - pp. 697–698 Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n5/abs/jors201189a.html

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