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Journal of the operational research society (JORS) |
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Ajouter le résultat dans votre panierBayesian policy support for adaptive strategies using computer models for complex physical systems / D. Williamson in Journal of the operational research society (JORS), Vol. 63 N° 8 (Août 2012)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1021–1033
Titre : Bayesian policy support for adaptive strategies using computer models for complex physical systems Type de document : texte imprimé Auteurs : D. Williamson, Auteur ; M. Goldstein, Auteur Année de publication : 2012 Article en page(s) : pp. 1021–1033 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Dynamic programming Policy support Sequential emulation Computer models Bayes linear adjustment CO2 abatement Index. décimale : 001.424 Résumé : In this paper, we discuss combining expert knowledge and computer simulators in order to provide decision support for policy makers managing complex physical systems. We allow future states of the complex system to be viewed after initial policy is made, and for those states to influence revision of policy. The potential for future observations and intervention impacts heavily on optimal policy for today and this is handled within our approach. We show how deriving policy dependent system uncertainty using computer models leads to an intractable backwards induction problem for the resulting decision tree. We introduce an algorithm for emulating an upper bound on our expected loss surface for all possible policies and discuss how this might be used in policy support. To illustrate our methodology, we look at choosing an optimal CO2 abatement strategy, combining an intermediate complexity climate model and an economic utility model with climate data. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011110a.html [article] Bayesian policy support for adaptive strategies using computer models for complex physical systems [texte imprimé] / D. Williamson, Auteur ; M. Goldstein, Auteur . - 2012 . - pp. 1021–1033.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1021–1033
Mots-clés : Dynamic programming Policy support Sequential emulation Computer models Bayes linear adjustment CO2 abatement Index. décimale : 001.424 Résumé : In this paper, we discuss combining expert knowledge and computer simulators in order to provide decision support for policy makers managing complex physical systems. We allow future states of the complex system to be viewed after initial policy is made, and for those states to influence revision of policy. The potential for future observations and intervention impacts heavily on optimal policy for today and this is handled within our approach. We show how deriving policy dependent system uncertainty using computer models leads to an intractable backwards induction problem for the resulting decision tree. We introduce an algorithm for emulating an upper bound on our expected loss surface for all possible policies and discuss how this might be used in policy support. To illustrate our methodology, we look at choosing an optimal CO2 abatement strategy, combining an intermediate complexity climate model and an economic utility model with climate data. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011110a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1034–1050
Titre : The combined manpower planning and preventive maintenance strategies by aggregate planning for the service division of vending machines Type de document : texte imprimé Auteurs : Kim, S., Auteur ; S. Yoo, Auteur Année de publication : 2012 Article en page(s) : pp. 1034–1050 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Aggregate planning Manpower planning Maintenance Repair Non-linear programming Vending machine industry Index. décimale : 001.424 Résumé : This paper presents a mathematical model of aggregate planning for the service division of vending machines, which determines its workforce size and the preventive maintenance level that may affect the failure rate. The unique aspect of this problem is that it exhibits two types of failures requiring different repair and preventive maintenance. The practice is to divide the service division into two groups, within which there are hierarchies according to these types of failures, and in each group, there are full-time workers with annual contracts and temporary workers hired only during the peak season. A case study based on actual operational data demonstrates how effective the introduced model and the policy are in reducing the total cost and improving the quality of service, and thus enhancing the overall system performance of the service division. We perform sensitivity analysis on key parameters, which helps us change maintenance strategies under diverse operating situations. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors201198a.html [article] The combined manpower planning and preventive maintenance strategies by aggregate planning for the service division of vending machines [texte imprimé] / Kim, S., Auteur ; S. Yoo, Auteur . - 2012 . - pp. 1034–1050.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1034–1050
Mots-clés : Aggregate planning Manpower planning Maintenance Repair Non-linear programming Vending machine industry Index. décimale : 001.424 Résumé : This paper presents a mathematical model of aggregate planning for the service division of vending machines, which determines its workforce size and the preventive maintenance level that may affect the failure rate. The unique aspect of this problem is that it exhibits two types of failures requiring different repair and preventive maintenance. The practice is to divide the service division into two groups, within which there are hierarchies according to these types of failures, and in each group, there are full-time workers with annual contracts and temporary workers hired only during the peak season. A case study based on actual operational data demonstrates how effective the introduced model and the policy are in reducing the total cost and improving the quality of service, and thus enhancing the overall system performance of the service division. We perform sensitivity analysis on key parameters, which helps us change maintenance strategies under diverse operating situations. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors201198a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1051–1064
Titre : Pattern recognition for evaluator errors in a credit scoring model for technology-based SMEs Type de document : texte imprimé Auteurs : Sohn, S. Y., Auteur ; M. K. Doo, Auteur ; Y. H. Ju, Auteur Année de publication : 2012 Article en page(s) : pp. 1051–1064 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Credit scoring model for technology-based SMEs Evaluator effect Decision tree Small and medium enterprise (SME) Index. décimale : 001.424 Résumé : A credit scoring model for technology-based small and medium enterprises presupposes evaluator objectivity and evaluation consistency; however, there is always some amount of error in any technology evaluation. This can be due in part to the subjective evaluation attributes that comprise part of the credit scoring model. The evaluated values of subjective attributes can vary among evaluators. In this study, we identified the significant characteristics of both evaluator and evaluation teams in terms of evaluation error using a decision tree analysis. Our results can improve the accuracy of a wide range of evaluation procedures for technology financing. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011105a.html [article] Pattern recognition for evaluator errors in a credit scoring model for technology-based SMEs [texte imprimé] / Sohn, S. Y., Auteur ; M. K. Doo, Auteur ; Y. H. Ju, Auteur . - 2012 . - pp. 1051–1064.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1051–1064
Mots-clés : Credit scoring model for technology-based SMEs Evaluator effect Decision tree Small and medium enterprise (SME) Index. décimale : 001.424 Résumé : A credit scoring model for technology-based small and medium enterprises presupposes evaluator objectivity and evaluation consistency; however, there is always some amount of error in any technology evaluation. This can be due in part to the subjective evaluation attributes that comprise part of the credit scoring model. The evaluated values of subjective attributes can vary among evaluators. In this study, we identified the significant characteristics of both evaluator and evaluation teams in terms of evaluation error using a decision tree analysis. Our results can improve the accuracy of a wide range of evaluation procedures for technology financing. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011105a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1065–1078
Titre : A system dynamics sustainable business model for Petroleos Mexicanos (Pemex) : case based on the Global Reporting Initiative Type de document : texte imprimé Auteurs : J. A. Duran-Encalada, Auteur ; Paucar-Caceres, A., Auteur Année de publication : 2012 Article en page(s) : pp. 1065–1078 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Business sustainability System dynamics modeling Sustainability reporting practices Corporate social responsibility Environmental management Index. décimale : 001.424 Résumé : We propose a System Dynamics model to explain the implementation and development of business sustainable policies at Petroleos Mexicanos (Pemex). The model is built using information reported by this company on the Global Reporting Initiative website. The simulation model incorporates the participation and expectations of internal and external stakeholders in defining sustainability (as perceived by the organization) and implementing its initiatives. Three variables (leadership, stakeholder motivation and external factors), identified as leverage points in the model, are used as means to improve the organization's journey towards achieving sustainability. The results of the simulation model seem to indicate that by increasing leadership activity and levels of stakeholder motivation, the journey towards sustainability can be greatly improved, and that external economic factors do not have a significant impact on sustainability achievement. These findings are pertinent for organizations currently in the process of implementing sustainable policies and strategies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011115a.html [article] A system dynamics sustainable business model for Petroleos Mexicanos (Pemex) : case based on the Global Reporting Initiative [texte imprimé] / J. A. Duran-Encalada, Auteur ; Paucar-Caceres, A., Auteur . - 2012 . - pp. 1065–1078.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1065–1078
Mots-clés : Business sustainability System dynamics modeling Sustainability reporting practices Corporate social responsibility Environmental management Index. décimale : 001.424 Résumé : We propose a System Dynamics model to explain the implementation and development of business sustainable policies at Petroleos Mexicanos (Pemex). The model is built using information reported by this company on the Global Reporting Initiative website. The simulation model incorporates the participation and expectations of internal and external stakeholders in defining sustainability (as perceived by the organization) and implementing its initiatives. Three variables (leadership, stakeholder motivation and external factors), identified as leverage points in the model, are used as means to improve the organization's journey towards achieving sustainability. The results of the simulation model seem to indicate that by increasing leadership activity and levels of stakeholder motivation, the journey towards sustainability can be greatly improved, and that external economic factors do not have a significant impact on sustainability achievement. These findings are pertinent for organizations currently in the process of implementing sustainable policies and strategies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011115a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1079–1088
Titre : DEA models for minimizing weight disparity in cross-efficiency evaluation Type de document : texte imprimé Auteurs : Y.-M. Wang, Auteur ; K.-S. Chin, Auteur ; Wang, S., Auteur Année de publication : 2012 Article en page(s) : pp. 1079–1088 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Data envelopment analysis Cross-efficiency evaluation Virtual disparity DEA ranking Index. décimale : 001.424 Résumé : Cross-efficiency evaluation is a commonly used approach for ranking decision-making units (DMUs) in data envelopment analysis (DEA). The weights used in the cross-efficiency evaluation may sometimes differ significantly among the inputs and outputs. This paper proposes some alternative DEA models to minimize the virtual disparity in the cross-efficiency evaluation. The proposed DEA models determine the input and output weights of each DMU in a neutral way without being aggressive or benevolent to the other DMUs. Numerical examples are tested to show the validity and effectiveness of the proposed DEA models and illustrate their significant role in reducing the number of zero weights. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011116a.html [article] DEA models for minimizing weight disparity in cross-efficiency evaluation [texte imprimé] / Y.-M. Wang, Auteur ; K.-S. Chin, Auteur ; Wang, S., Auteur . - 2012 . - pp. 1079–1088.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1079–1088
Mots-clés : Data envelopment analysis Cross-efficiency evaluation Virtual disparity DEA ranking Index. décimale : 001.424 Résumé : Cross-efficiency evaluation is a commonly used approach for ranking decision-making units (DMUs) in data envelopment analysis (DEA). The weights used in the cross-efficiency evaluation may sometimes differ significantly among the inputs and outputs. This paper proposes some alternative DEA models to minimize the virtual disparity in the cross-efficiency evaluation. The proposed DEA models determine the input and output weights of each DMU in a neutral way without being aggressive or benevolent to the other DMUs. Numerical examples are tested to show the validity and effectiveness of the proposed DEA models and illustrate their significant role in reducing the number of zero weights. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011116a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1089–1097
Titre : Congestion analysis in DEA inputs under weight restrictions Type de document : texte imprimé Auteurs : A. Davoodi, Auteur ; H. Zhiani Rezai, Auteur ; R. Fallahnejad, Auteur Année de publication : 2012 Article en page(s) : pp. 1089–1097 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Data envelopment analysis Weight restrictions Congestion Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA), which is used to determine the efficiency of a decision-making unit (DMU), is able to recognize the amount of input congestion. Moreover, the relative importance of inputs and outputs can be incorporated into DEA models by weight restrictions. These restrictions or a priori weights are introduced by the decision maker and lead to changes in models and efficiency interpretation. In this paper, we present an approach to determine the value of congestion in inputs under the weight restrictions. Some discussions show how weight restrictions can affect the congestion amount. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011104a.html [article] Congestion analysis in DEA inputs under weight restrictions [texte imprimé] / A. Davoodi, Auteur ; H. Zhiani Rezai, Auteur ; R. Fallahnejad, Auteur . - 2012 . - pp. 1089–1097.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1089–1097
Mots-clés : Data envelopment analysis Weight restrictions Congestion Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA), which is used to determine the efficiency of a decision-making unit (DMU), is able to recognize the amount of input congestion. Moreover, the relative importance of inputs and outputs can be incorporated into DEA models by weight restrictions. These restrictions or a priori weights are introduced by the decision maker and lead to changes in models and efficiency interpretation. In this paper, we present an approach to determine the value of congestion in inputs under the weight restrictions. Some discussions show how weight restrictions can affect the congestion amount. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011104a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1098–1115
Titre : Performance assessment of secondary schools : the snapshot of a country taken by DEA Type de document : texte imprimé Auteurs : M. C. S. Portela, Auteur ; A. S. Camanho, Auteur ; D. Borges, Auteur Année de publication : 2012 Article en page(s) : pp. 1098–1115 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Data envelopment analysis Secondary schools Weight restrictions Single weights Index. décimale : 001.424 Résumé : This paper describes a performance assessment of Portuguese secondary schools using data envelopment analysis (DEA). The assessment adopts a perspective where schools are viewed as promoting students achievement given their characteristics in terms of academic abilities and socio-economic background. Our sample comprised all secondary schools in Portugal with both basic and secondary education levels. Two types of DEA analysis are performed: one using an output-oriented model that restricts output (exam scores) weights to be linked to the number of students that have done that exam in the school, and the other using a model that restricts factor weights to be equal for all schools. In this model the weight restrictions are linked to the total number of exams done nationally. The first model is well suited for identifying worst performing schools and to assess schools that may specialize in certain subjects, whereas the latter is best suited for improving discrimination between best performing schools when pursuing the identification of benchmarks, as well as to construct performance rankings. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011114a.html [article] Performance assessment of secondary schools : the snapshot of a country taken by DEA [texte imprimé] / M. C. S. Portela, Auteur ; A. S. Camanho, Auteur ; D. Borges, Auteur . - 2012 . - pp. 1098–1115.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1098–1115
Mots-clés : Data envelopment analysis Secondary schools Weight restrictions Single weights Index. décimale : 001.424 Résumé : This paper describes a performance assessment of Portuguese secondary schools using data envelopment analysis (DEA). The assessment adopts a perspective where schools are viewed as promoting students achievement given their characteristics in terms of academic abilities and socio-economic background. Our sample comprised all secondary schools in Portugal with both basic and secondary education levels. Two types of DEA analysis are performed: one using an output-oriented model that restricts output (exam scores) weights to be linked to the number of students that have done that exam in the school, and the other using a model that restricts factor weights to be equal for all schools. In this model the weight restrictions are linked to the total number of exams done nationally. The first model is well suited for identifying worst performing schools and to assess schools that may specialize in certain subjects, whereas the latter is best suited for improving discrimination between best performing schools when pursuing the identification of benchmarks, as well as to construct performance rankings. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011114a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1116–1125
Titre : Scheduling de-icing vehicles within airport logistics : a heuristic algorithm and performance evaluation Type de document : texte imprimé Auteurs : A. Norin, Auteur ; D. Yuan, Auteur ; T. A. Granberg, Auteur ; P. Värbrand, Auteur Année de publication : 2012 Article en page(s) : pp. 1116–1125 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Air transport Logistics Multi-objective Planning Vehicle routing Heuristics Index. décimale : 001.424 Résumé : Most delays in the air transport occur at the airport. A particular reason is the complexity of managing the large number of supporting flows in airport logistics. We consider the optimisation problem of scheduling de-icing vehicles that is one of the key supporting logistic flows in the turn-around process of aircraft. The objective is to minimise the delay of flights due to de-icing, and the travel distance of the de-icing vehicles. We study the complexity of the problem, and develop a solution algorithm using greedy randomised adaptive search. A case study of real-life data from Stockholm Arlanda Airport shows that optimised schedule leads to significantly better performance in comparison to intuitive and simple scheduling strategies. The benefit of optimisation in reducing the waiting time for de-icing is further demonstrated via dynamic simulations. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011100a.html [article] Scheduling de-icing vehicles within airport logistics : a heuristic algorithm and performance evaluation [texte imprimé] / A. Norin, Auteur ; D. Yuan, Auteur ; T. A. Granberg, Auteur ; P. Värbrand, Auteur . - 2012 . - pp. 1116–1125.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1116–1125
Mots-clés : Air transport Logistics Multi-objective Planning Vehicle routing Heuristics Index. décimale : 001.424 Résumé : Most delays in the air transport occur at the airport. A particular reason is the complexity of managing the large number of supporting flows in airport logistics. We consider the optimisation problem of scheduling de-icing vehicles that is one of the key supporting logistic flows in the turn-around process of aircraft. The objective is to minimise the delay of flights due to de-icing, and the travel distance of the de-icing vehicles. We study the complexity of the problem, and develop a solution algorithm using greedy randomised adaptive search. A case study of real-life data from Stockholm Arlanda Airport shows that optimised schedule leads to significantly better performance in comparison to intuitive and simple scheduling strategies. The benefit of optimisation in reducing the waiting time for de-icing is further demonstrated via dynamic simulations. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011100a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1126–1142
Titre : Optimising container storage processes at multimodal terminals Type de document : texte imprimé Auteurs : B. Casey, Auteur ; E. Kozan, Auteur Année de publication : 2012 Article en page(s) : pp. 1126–1142 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Heuristics Container Multimodal Sea transport Index. décimale : 001.424 Résumé : Multimodal Container Terminals (MMCT) require comprehensive planning, programming and control in order to operate an efficient storage system. In this paper, a model has been developed for the storage system of the MMCT. It is an extension of the Blocks Relocation Problem, with incoming as well as outgoing containers, or ‘blocks’. The model deals with assigning containers to positions within the storage area, rehandling of containers to be retrieved, and calculation of the processing times in order to perform these actions. A number of constructive heuristics are presented in order to produce good initial solutions for this problem. Meta-heuristics are also used to improve on these solutions. Results from the various heuristics on a few case study problems are compared and discussed. This research will also provide a core piece of technology for the development of autonomous container handling systems for terminals. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011113a.html [article] Optimising container storage processes at multimodal terminals [texte imprimé] / B. Casey, Auteur ; E. Kozan, Auteur . - 2012 . - pp. 1126–1142.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1126–1142
Mots-clés : Heuristics Container Multimodal Sea transport Index. décimale : 001.424 Résumé : Multimodal Container Terminals (MMCT) require comprehensive planning, programming and control in order to operate an efficient storage system. In this paper, a model has been developed for the storage system of the MMCT. It is an extension of the Blocks Relocation Problem, with incoming as well as outgoing containers, or ‘blocks’. The model deals with assigning containers to positions within the storage area, rehandling of containers to be retrieved, and calculation of the processing times in order to perform these actions. A number of constructive heuristics are presented in order to produce good initial solutions for this problem. Meta-heuristics are also used to improve on these solutions. Results from the various heuristics on a few case study problems are compared and discussed. This research will also provide a core piece of technology for the development of autonomous container handling systems for terminals. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011113a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1143–1152
Titre : Multi-item two-echelon spare parts inventory control problem with batch ordering in the central warehouse under compound Poisson demand Type de document : texte imprimé Auteurs : E. Topan, Auteur ; Z. P. Bayindir, Auteur Année de publication : 2012 Article en page(s) : pp. 1143–1152 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Heuristics Two-echelon Multi-item Batch ordering Compound Poisson demand System approach Index. décimale : 001.424 Résumé : We consider a multi-item two-echelon spare part inventory system in which the central warehouse operates under an (nQ, R) policy and the local warehouses implement order-up-to S policy, each facing a compound Poisson demand. The objective is to find the policy parameters minimizing expected system-wide inventory holding and fixed ordering costs subject to an aggregate mean response time constraint at each warehouse. In this paper, we propose four alternative approximations for the steady state performance of the system; and extend a heuristic and a lower bound proposed under Poisson demand assumption to the compound Poisson setting. In a computational study, we show that the performances of the approximations, the heuristic, and the lower bound are quite satisfactory; and the relative cost saving of setting an aggregate service level rather than individually for each part is quite high. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011125a.html [article] Multi-item two-echelon spare parts inventory control problem with batch ordering in the central warehouse under compound Poisson demand [texte imprimé] / E. Topan, Auteur ; Z. P. Bayindir, Auteur . - 2012 . - pp. 1143–1152.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1143–1152
Mots-clés : Heuristics Two-echelon Multi-item Batch ordering Compound Poisson demand System approach Index. décimale : 001.424 Résumé : We consider a multi-item two-echelon spare part inventory system in which the central warehouse operates under an (nQ, R) policy and the local warehouses implement order-up-to S policy, each facing a compound Poisson demand. The objective is to find the policy parameters minimizing expected system-wide inventory holding and fixed ordering costs subject to an aggregate mean response time constraint at each warehouse. In this paper, we propose four alternative approximations for the steady state performance of the system; and extend a heuristic and a lower bound proposed under Poisson demand assumption to the compound Poisson setting. In a computational study, we show that the performances of the approximations, the heuristic, and the lower bound are quite satisfactory; and the relative cost saving of setting an aggregate service level rather than individually for each part is quite high. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011125a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1153–1164
Titre : Network-based method for ranking of efficient units in two-stage DEA models Type de document : texte imprimé Auteurs : J. S. Liu, Auteur ; W.-M. Lu, Auteur Année de publication : 2012 Article en page(s) : pp. 1153–1164 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Data envelopment analysis Two-stage DEA Network-based ranking method Network centrality Index. décimale : 001.424 Résumé : This study presents a methodology that is able to further discriminate the efficient decision-making units (DMUs) in a two-stage data envelopment analysis (DEA) context. The methodology is an extension of the single-stage network-based ranking method, which utilizes the eigenvector centrality concept in social network analysis to determine the rank of efficient DMUs. The mathematical formulation for the method to work under the two-stage DEA context is laid out and then applied to a real-world problem. In addition to its basic ranking function, the exercise highlights two particular features of the method that are not available in standard DEA: suggesting a benchmark unit for each input/intermediate/output factor, and identifying the strengths of each efficient unit. With the methodology, the value of DEA greatly increases. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011132a.html [article] Network-based method for ranking of efficient units in two-stage DEA models [texte imprimé] / J. S. Liu, Auteur ; W.-M. Lu, Auteur . - 2012 . - pp. 1153–1164.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1153–1164
Mots-clés : Data envelopment analysis Two-stage DEA Network-based ranking method Network centrality Index. décimale : 001.424 Résumé : This study presents a methodology that is able to further discriminate the efficient decision-making units (DMUs) in a two-stage data envelopment analysis (DEA) context. The methodology is an extension of the single-stage network-based ranking method, which utilizes the eigenvector centrality concept in social network analysis to determine the rank of efficient DMUs. The mathematical formulation for the method to work under the two-stage DEA context is laid out and then applied to a real-world problem. In addition to its basic ranking function, the exercise highlights two particular features of the method that are not available in standard DEA: suggesting a benchmark unit for each input/intermediate/output factor, and identifying the strengths of each efficient unit. With the methodology, the value of DEA greatly increases. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors2011132a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1165–1173
Titre : Comparing reinforcement learning approaches for solving game theoretic models : a dynamic airline pricing game example Type de document : texte imprimé Auteurs : A. Collins, Auteur ; L. Thomas, Auteur Année de publication : 2012 Article en page(s) : pp. 1165–1173 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Game theory Artificial intelligence Reinforcement learning Air transport Index. décimale : 001.424 Résumé : Games can be easy to construct but difficult to solve due to current methods available for finding the Nash Equilibrium. This issue is one of many that face modern game theorists and those analysts that need to model situations with multiple decision-makers. This paper explores the use of reinforcement learning, a standard artificial intelligence technique, as a means to solve a simple dynamic airline pricing game. Three different reinforcement learning approaches are compared: SARSA, Q-learning and Monte Carlo Learning. The pricing game solution is surprisingly sophisticated given the game's simplicity and this sophistication is reflected in the learning results. The paper also discusses extra analytical benefit obtained from applying reinforcement learning to these types of problems. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors201194a.html [article] Comparing reinforcement learning approaches for solving game theoretic models : a dynamic airline pricing game example [texte imprimé] / A. Collins, Auteur ; L. Thomas, Auteur . - 2012 . - pp. 1165–1173.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 8 (Août 2012) . - pp. 1165–1173
Mots-clés : Game theory Artificial intelligence Reinforcement learning Air transport Index. décimale : 001.424 Résumé : Games can be easy to construct but difficult to solve due to current methods available for finding the Nash Equilibrium. This issue is one of many that face modern game theorists and those analysts that need to model situations with multiple decision-makers. This paper explores the use of reinforcement learning, a standard artificial intelligence technique, as a means to solve a simple dynamic airline pricing game. Three different reinforcement learning approaches are compared: SARSA, Q-learning and Monte Carlo Learning. The pricing game solution is surprisingly sophisticated given the game's simplicity and this sophistication is reflected in the learning results. The paper also discusses extra analytical benefit obtained from applying reinforcement learning to these types of problems. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n8/abs/jors201194a.html
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