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Journal of the operational research society (JORS) |
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Ajouter le résultat dans votre panierModelling and solving an m-location, n-courier, priority-based planning problem on a network / Erdogan, G. in Journal of the operational research society (JORS), Vol. 63 N° 1 (Janvier 2012)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 2–15
Titre : Modelling and solving an m-location, n-courier, priority-based planning problem on a network Type de document : texte imprimé Auteurs : Erdogan, G., Auteur ; B. Tansel, Auteur ; I Akgün, Auteur Année de publication : 2012 Article en page(s) : pp. 2–15 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Transport Optimization Military Networks and graphs Index. décimale : 001.424 Résumé : In this paper, we study an m-location, n-courier, priority-based planning problem on a network, which we refer to as the Courier Planning Problem (CPP). The CPP arises on a daily basis in the context of planning the transportation of materials and personnel in peacetime for the Turkish Armed Forces. The main issue addressed in CPP is to transport as many of deliverables as possible from their origins to their destinations via a fleet of transportation assets (couriers) that operate at fixed routes and schedules. Priorities must be taken into account and constraints on the routes, operating schedules, and capacities of the transportation assets must be obeyed. Time windows may be specified for some or all transportation requests and must be satisfied. We study the CPP as well as its two extensions, and present integer programming formulations based on the multi-commodity flow structure. The formulations are tested on real world-based data and display satisfactory computational performance. Our main contributions are to develop an effective formulation scheme for a complicated large-scale real world problem and to demonstrate that such problems are solvable via commercial general purpose solvers through meticulous modelling. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20118a.html [article] Modelling and solving an m-location, n-courier, priority-based planning problem on a network [texte imprimé] / Erdogan, G., Auteur ; B. Tansel, Auteur ; I Akgün, Auteur . - 2012 . - pp. 2–15.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 2–15
Mots-clés : Transport Optimization Military Networks and graphs Index. décimale : 001.424 Résumé : In this paper, we study an m-location, n-courier, priority-based planning problem on a network, which we refer to as the Courier Planning Problem (CPP). The CPP arises on a daily basis in the context of planning the transportation of materials and personnel in peacetime for the Turkish Armed Forces. The main issue addressed in CPP is to transport as many of deliverables as possible from their origins to their destinations via a fleet of transportation assets (couriers) that operate at fixed routes and schedules. Priorities must be taken into account and constraints on the routes, operating schedules, and capacities of the transportation assets must be obeyed. Time windows may be specified for some or all transportation requests and must be satisfied. We study the CPP as well as its two extensions, and present integer programming formulations based on the multi-commodity flow structure. The formulations are tested on real world-based data and display satisfactory computational performance. Our main contributions are to develop an effective formulation scheme for a complicated large-scale real world problem and to demonstrate that such problems are solvable via commercial general purpose solvers through meticulous modelling. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20118a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 16–27
Titre : Value-based DEA models: application-driven developments Type de document : texte imprimé Auteurs : P. N. de Almeida, Auteur ; L. C. Dias, Auteur Année de publication : 2012 Article en page(s) : pp. 16–27 Note générale : Recherche op&rationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Multi-criteria decision analysis Additive model Weight restrictions Retail chains Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA) is an approach based on linear programming to assess the relative efficiency of peer decision-making units (DMUs). Typically, each DMU is free to choose the weights of the factors used in its evaluation. However, the evaluator's preferences may not warrant so much freedom. Several approaches have been proposed to allow the incorporation of managerial preferences in DEA, but few address the additive DEA model specifically. This paper presents additive DEA models that use multi-criteria decision analysis concepts to incorporate managerial preferences, and presents the corresponding preference elicitation protocols. The models developed allow the incorporation of preferences at different levels: on valuing performance improvements, on introducing weight restrictions, and on finding adequate targets. These were application-driven developments, resulting from discussing modelling options and preliminary results with the top-level management of a retail chain in the context of an assessment of stores’ performance, also described in this paper. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201115a.html [article] Value-based DEA models: application-driven developments [texte imprimé] / P. N. de Almeida, Auteur ; L. C. Dias, Auteur . - 2012 . - pp. 16–27.
Recherche op&rationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 16–27
Mots-clés : Data envelopment analysis Multi-criteria decision analysis Additive model Weight restrictions Retail chains Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA) is an approach based on linear programming to assess the relative efficiency of peer decision-making units (DMUs). Typically, each DMU is free to choose the weights of the factors used in its evaluation. However, the evaluator's preferences may not warrant so much freedom. Several approaches have been proposed to allow the incorporation of managerial preferences in DEA, but few address the additive DEA model specifically. This paper presents additive DEA models that use multi-criteria decision analysis concepts to incorporate managerial preferences, and presents the corresponding preference elicitation protocols. The models developed allow the incorporation of preferences at different levels: on valuing performance improvements, on introducing weight restrictions, and on finding adequate targets. These were application-driven developments, resulting from discussing modelling options and preliminary results with the top-level management of a retail chain in the context of an assessment of stores’ performance, also described in this paper. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201115a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 28–37
Titre : Determining a subsidy rate for Taiwan's recycling glass industry : an application of bi-level programming Type de document : texte imprimé Auteurs : H-S. Shih, Auteur ; C. B. Cheng, Auteur ; U-P. Wen, Auteur Année de publication : 2012 Article en page(s) : pp. 28–37 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Bi-level programming problem Glass recycling industry Subsidy rate Recycling and treatment fee 0−1 mixed integer programming KKT conditions Index. décimale : 001.424 Résumé : This study attempts to optimize the operations of the Recycling Fund Management Board (RFMB), founded by the Environmental Protection Administration of the R.O.C. Government (on Taiwan), through the decision of a subsidy rate for the domestic glass recycling industry. The hierarchical and interactive nature between the two parties is modelled by bi-level programming, where the RFMB plays the upper-level decision unit while the recycling industry is the lower-level counterpart. In order to solve the problem by optimization software, the bi-level formulation is transformed to a single-level problem via Karush-Kuhn-Tucker optimality conditions and is further transformed to a 0−1 mixed integer programming problem by variable substitution. The problem is solved with real-world data, and the obtained solutions are analysed and compared with the RFMB’s current operations. The results suggest that the proposed approach can improve the operations of the RFMB. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201113a.html [article] Determining a subsidy rate for Taiwan's recycling glass industry : an application of bi-level programming [texte imprimé] / H-S. Shih, Auteur ; C. B. Cheng, Auteur ; U-P. Wen, Auteur . - 2012 . - pp. 28–37.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 28–37
Mots-clés : Bi-level programming problem Glass recycling industry Subsidy rate Recycling and treatment fee 0−1 mixed integer programming KKT conditions Index. décimale : 001.424 Résumé : This study attempts to optimize the operations of the Recycling Fund Management Board (RFMB), founded by the Environmental Protection Administration of the R.O.C. Government (on Taiwan), through the decision of a subsidy rate for the domestic glass recycling industry. The hierarchical and interactive nature between the two parties is modelled by bi-level programming, where the RFMB plays the upper-level decision unit while the recycling industry is the lower-level counterpart. In order to solve the problem by optimization software, the bi-level formulation is transformed to a single-level problem via Karush-Kuhn-Tucker optimality conditions and is further transformed to a 0−1 mixed integer programming problem by variable substitution. The problem is solved with real-world data, and the obtained solutions are analysed and compared with the RFMB’s current operations. The results suggest that the proposed approach can improve the operations of the RFMB. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201113a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 38–46
Titre : Context-dependent data envelopment analysis with cross-efficiency evaluation Type de document : texte imprimé Auteurs : S. Lim, Auteur Année de publication : 2012 Article en page(s) : pp. 38–46 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Context-dependent DEA Cross-efficiency Benchmarking Index. décimale : 001.424 Résumé : To address some problems with the original context-dependent data envelopment analysis (DEA), this paper proposes a new version of context-dependent DEA; this version is based on cross-efficiency evaluations. One of the problems with the original context-dependent DEA is that the attractiveness and progress measures only represent the radial distance between the decision-making unit (DMU) under evaluation and the evaluation context. This representation only shows how distinct the DMU is from a single specific DMU on the evaluation context, not from the entire evaluation context overall. Another problem is that the magnitude of attractiveness and progress scores in the original context-dependent DEA may not have significant meanings. It may not be proper to say that a DMU is more attractive simply because it has a higher attractiveness score for the same reason that the performance of inefficient DMUs cannot be compared with one another simply based on their efficiency scores. We incorporate cross-efficiency evaluations into the context-dependent DEA to overcome the preceding shortcomings of the original context-dependent DEA. We also demonstrate the proposed model's appropriateness and usefulness with an illustrative example. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201129a.html [article] Context-dependent data envelopment analysis with cross-efficiency evaluation [texte imprimé] / S. Lim, Auteur . - 2012 . - pp. 38–46.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 38–46
Mots-clés : Data envelopment analysis Context-dependent DEA Cross-efficiency Benchmarking Index. décimale : 001.424 Résumé : To address some problems with the original context-dependent data envelopment analysis (DEA), this paper proposes a new version of context-dependent DEA; this version is based on cross-efficiency evaluations. One of the problems with the original context-dependent DEA is that the attractiveness and progress measures only represent the radial distance between the decision-making unit (DMU) under evaluation and the evaluation context. This representation only shows how distinct the DMU is from a single specific DMU on the evaluation context, not from the entire evaluation context overall. Another problem is that the magnitude of attractiveness and progress scores in the original context-dependent DEA may not have significant meanings. It may not be proper to say that a DMU is more attractive simply because it has a higher attractiveness score for the same reason that the performance of inefficient DMUs cannot be compared with one another simply based on their efficiency scores. We incorporate cross-efficiency evaluations into the context-dependent DEA to overcome the preceding shortcomings of the original context-dependent DEA. We also demonstrate the proposed model's appropriateness and usefulness with an illustrative example. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201129a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 47–58
Titre : Evolving hyper-heuristics for the uncapacitated examination timetabling problem Type de document : texte imprimé Auteurs : N. Pillay, Auteur Année de publication : 2012 Article en page(s) : pp. 47–58 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Hyper-heuristics Uncapacitated examination timetabling problem Evolutionary algorithms Index. décimale : 001.424 Résumé : This paper reports on the use of an evolutionary algorithm (EA) to search a space of heuristic combinations for the uncapacitated examination timetabling problem. The representation used by an EA has an effect on the difficulty of the search and hence the overall success of the system. The paper examines three different representations of heuristic combinations for this problem and compares their performance on a set of benchmark problems for the uncapacitated examination timetabling problem. The study has revealed that certain representations do result in a better performance and generalization of the hyper-heuristic. An EA-based hyper-heuristic combining the use of all three representations (CEA) was implemented and found to generalize better than the EA using each of the representations separately. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201112a.html [article] Evolving hyper-heuristics for the uncapacitated examination timetabling problem [texte imprimé] / N. Pillay, Auteur . - 2012 . - pp. 47–58.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 47–58
Mots-clés : Hyper-heuristics Uncapacitated examination timetabling problem Evolutionary algorithms Index. décimale : 001.424 Résumé : This paper reports on the use of an evolutionary algorithm (EA) to search a space of heuristic combinations for the uncapacitated examination timetabling problem. The representation used by an EA has an effect on the difficulty of the search and hence the overall success of the system. The paper examines three different representations of heuristic combinations for this problem and compares their performance on a set of benchmark problems for the uncapacitated examination timetabling problem. The study has revealed that certain representations do result in a better performance and generalization of the hyper-heuristic. An EA-based hyper-heuristic combining the use of all three representations (CEA) was implemented and found to generalize better than the EA using each of the representations separately. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201112a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 59–63
Titre : An alternative formulation for the fuzzy assignment problem Type de document : texte imprimé Auteurs : A. Emrouznejad, Auteur ; M. L. Zerafat Angiz, Auteur ; W. Ho, Auteur Année de publication : 2012 Article en page(s) : pp. 59–63 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Assignment problem Fuzzy data Data envelopment analysis Index. décimale : 001.424 Résumé : The existing assignment problems for assigning n jobs to n individuals are limited to the considerations of cost or profit measured as crisp. However, in many real applications, costs are not deterministic numbers. This paper develops a procedure based on Data Envelopment Analysis method to solve the assignment problems with fuzzy costs or fuzzy profits for each possible assignment. It aims to obtain the points with maximum membership values for the fuzzy parameters while maximizing the profit or minimizing the assignment cost. In this method, a discrete approach is presented to rank the fuzzy numbers first. Then, corresponding to each fuzzy number, we introduce a crisp number using the efficiency concept. A numerical example is used to illustrate the usefulness of this new method. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201114a.html [article] An alternative formulation for the fuzzy assignment problem [texte imprimé] / A. Emrouznejad, Auteur ; M. L. Zerafat Angiz, Auteur ; W. Ho, Auteur . - 2012 . - pp. 59–63.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 59–63
Mots-clés : Assignment problem Fuzzy data Data envelopment analysis Index. décimale : 001.424 Résumé : The existing assignment problems for assigning n jobs to n individuals are limited to the considerations of cost or profit measured as crisp. However, in many real applications, costs are not deterministic numbers. This paper develops a procedure based on Data Envelopment Analysis method to solve the assignment problems with fuzzy costs or fuzzy profits for each possible assignment. It aims to obtain the points with maximum membership values for the fuzzy parameters while maximizing the profit or minimizing the assignment cost. In this method, a discrete approach is presented to rank the fuzzy numbers first. Then, corresponding to each fuzzy number, we introduce a crisp number using the efficiency concept. A numerical example is used to illustrate the usefulness of this new method. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201114a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 64–71
Titre : Efficiency decomposition for parallel production systems Type de document : texte imprimé Auteurs : C. Kao, Auteur Année de publication : 2012 Article en page(s) : pp. 64–71 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Parallel system Efficiency decomposition Network system Index. décimale : 001.424 Résumé : For production systems composed of parallel processes, the system efficiency will more properly represent the aggregate performance of the component processes if the operation of each process is taken into consideration. Several approaches have been proposed for measuring the efficiency of parallel production systems. By requiring the same factor to have the same virtual multiplier, the proposed method is able to calculate the system and process efficiencies at the same time. Moreover, the former can be decomposed into a weighted average of the latter. A system is efficient only if all of its component processes are efficient. Chemistry departments in the UK are used as an example, where teaching and research are two major functions of the department. The relationship between the system and process efficiencies which holds for the case of constant returns to scale can be extended to the case of variable returns to scale. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201116a.html [article] Efficiency decomposition for parallel production systems [texte imprimé] / C. Kao, Auteur . - 2012 . - pp. 64–71.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 64–71
Mots-clés : Data envelopment analysis Parallel system Efficiency decomposition Network system Index. décimale : 001.424 Résumé : For production systems composed of parallel processes, the system efficiency will more properly represent the aggregate performance of the component processes if the operation of each process is taken into consideration. Several approaches have been proposed for measuring the efficiency of parallel production systems. By requiring the same factor to have the same virtual multiplier, the proposed method is able to calculate the system and process efficiencies at the same time. Moreover, the former can be decomposed into a weighted average of the latter. A system is efficient only if all of its component processes are efficient. Chemistry departments in the UK are used as an example, where teaching and research are two major functions of the department. The relationship between the system and process efficiencies which holds for the case of constant returns to scale can be extended to the case of variable returns to scale. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201116a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 72–78
Titre : A global cost Malmquist productivity index using data envelopment analysis Type de document : texte imprimé Auteurs : G. Tohidi, Auteur ; S. Razavyan, Auteur ; S. Tohidnia, Auteur Année de publication : 2012 Article en page(s) : pp. 72–78 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : linear programming data envelopment analysis allocative efficiency circularity Malmquist index Index. décimale : 001.424 Résumé : This paper proposes a global cost Malmquist productivity index, new cost Malmquist productivity index, that is circular and that gives a single measure of productivity change. The index is inspired by the global Malmquist productivity index as extended to productivity measurement. Decomposition of the proposed cost Malmquist productivity index is presented. Numerical results are presented for an example taken from the literature to illustrate the proposed algorithm. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201123a.html [article] A global cost Malmquist productivity index using data envelopment analysis [texte imprimé] / G. Tohidi, Auteur ; S. Razavyan, Auteur ; S. Tohidnia, Auteur . - 2012 . - pp. 72–78.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 72–78
Mots-clés : linear programming data envelopment analysis allocative efficiency circularity Malmquist index Index. décimale : 001.424 Résumé : This paper proposes a global cost Malmquist productivity index, new cost Malmquist productivity index, that is circular and that gives a single measure of productivity change. The index is inspired by the global Malmquist productivity index as extended to productivity measurement. Decomposition of the proposed cost Malmquist productivity index is presented. Numerical results are presented for an example taken from the literature to illustrate the proposed algorithm. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201123a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 79–88
Titre : Using system dynamics principles for conceptual modelling of publicly funded hospitals Type de document : texte imprimé Auteurs : H. J. Wong, Auteur ; D. Morra, Auteur ; R. C. Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 79–88 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Hospitals Strategic planning Health service Learning System dynamics Index. décimale : 001.424 Résumé : This paper examines the long-standing operational issue of patients boarding in the emergency department (ED), who have been admitted to hospital (inpatient ‘boarders’). From this analysis we design a conceptual model that provides a roadmap to create sustainable improvements in ED waiting times. The conceptual model is built using system dynamics methodology, and illustrates the use of system archetypes, a set of common causal feedback loops that illustrate how well-intended decisions have unintentional side effects. This paper outlines the journey taken by one large academic health centre to address these issues, and highlights the larger implications and recommendations that are applicable to other publicly funded hospitals. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors2010164a.html [article] Using system dynamics principles for conceptual modelling of publicly funded hospitals [texte imprimé] / H. J. Wong, Auteur ; D. Morra, Auteur ; R. C. Wu, Auteur . - 2012 . - pp. 79–88.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 79–88
Mots-clés : Hospitals Strategic planning Health service Learning System dynamics Index. décimale : 001.424 Résumé : This paper examines the long-standing operational issue of patients boarding in the emergency department (ED), who have been admitted to hospital (inpatient ‘boarders’). From this analysis we design a conceptual model that provides a roadmap to create sustainable improvements in ED waiting times. The conceptual model is built using system dynamics methodology, and illustrates the use of system archetypes, a set of common causal feedback loops that illustrate how well-intended decisions have unintentional side effects. This paper outlines the journey taken by one large academic health centre to address these issues, and highlights the larger implications and recommendations that are applicable to other publicly funded hospitals. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors2010164a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 89–106
Titre : Investment decisions in the rent-to-own industry in the absence of inventory Type de document : texte imprimé Auteurs : M. H. Anderson, Auteur ; S. Sibdari, Auteur Année de publication : 2012 Article en page(s) : pp. 89–106 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Dynamic programming Inventory level Consumer credit Payment schedule Transactions data Empirical estimation Index. décimale : 001.424 Résumé : This study addresses the product investment decision faced by firms in the rent-to-own industry. In this setting, a customer arrives according to a random process and requests one unit of a product to rent (and eventually own should he/she choose to make all the required payments). At the time of request, if the product is available in inventory, the firm enters into a contractual agreement (by accepting the customer's offer) and rents the merchandise. More interesting and the case considered here, if the requested item is not in inventory, the firm must decide whether to purchase the item in order to rent it out or to simply reject the request. The customer's offer specifies the desired maximum contract length and the payment frequency—from which the firm determines the fixed periodic payment charged. The firm makes its investment decision based on the characteristics of the offer as well as those of the product (eg, initial and resale values, useful life and carrying costs) in essence performing a complicated cost benefit analysis. An extension is also considered whereby instead of simply rejecting the request the firm can adjust the required payment amount. Dynamic programming techniques are used to address the problem and to solve for the firm's optimal decision. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20113a.html [article] Investment decisions in the rent-to-own industry in the absence of inventory [texte imprimé] / M. H. Anderson, Auteur ; S. Sibdari, Auteur . - 2012 . - pp. 89–106.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 89–106
Mots-clés : Dynamic programming Inventory level Consumer credit Payment schedule Transactions data Empirical estimation Index. décimale : 001.424 Résumé : This study addresses the product investment decision faced by firms in the rent-to-own industry. In this setting, a customer arrives according to a random process and requests one unit of a product to rent (and eventually own should he/she choose to make all the required payments). At the time of request, if the product is available in inventory, the firm enters into a contractual agreement (by accepting the customer's offer) and rents the merchandise. More interesting and the case considered here, if the requested item is not in inventory, the firm must decide whether to purchase the item in order to rent it out or to simply reject the request. The customer's offer specifies the desired maximum contract length and the payment frequency—from which the firm determines the fixed periodic payment charged. The firm makes its investment decision based on the characteristics of the offer as well as those of the product (eg, initial and resale values, useful life and carrying costs) in essence performing a complicated cost benefit analysis. An extension is also considered whereby instead of simply rejecting the request the firm can adjust the required payment amount. Dynamic programming techniques are used to address the problem and to solve for the firm's optimal decision. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20113a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 107–121
Titre : Real options with synergies : static versus dynamic policies Type de document : texte imprimé Auteurs : M. Nishihara, Auteur Année de publication : 2012 Article en page(s) : pp. 107–121 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Multiple real options Synergy Static versus dynamic Optimal stopping Exercise region Index. décimale : 001.424 Résumé : We develop a model for determining whether a firm should exercise two real options individually or simultaneously. The simultaneous exercise of both options has synergy of cost savings, while the separate exercise of each option benefits from project flexibility. This trade-off determines the optimal exercise policy. We compare static and dynamic management of multiple real options. A firm under static management determines the type of exercise of real options ex ante; on the other hand, a firm under dynamic management makes the decision at the time of exercise. We show that highly correlated projects increase the option values under both styles of management because a firm is more likely to enjoy the synergy gains of joint investment. We also highlight the advantage of dynamic management over static management for weakly correlated projects. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20115a.html [article] Real options with synergies : static versus dynamic policies [texte imprimé] / M. Nishihara, Auteur . - 2012 . - pp. 107–121.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 107–121
Mots-clés : Multiple real options Synergy Static versus dynamic Optimal stopping Exercise region Index. décimale : 001.424 Résumé : We develop a model for determining whether a firm should exercise two real options individually or simultaneously. The simultaneous exercise of both options has synergy of cost savings, while the separate exercise of each option benefits from project flexibility. This trade-off determines the optimal exercise policy. We compare static and dynamic management of multiple real options. A firm under static management determines the type of exercise of real options ex ante; on the other hand, a firm under dynamic management makes the decision at the time of exercise. We show that highly correlated projects increase the option values under both styles of management because a firm is more likely to enjoy the synergy gains of joint investment. We also highlight the advantage of dynamic management over static management for weakly correlated projects. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors20115a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 122–129
Titre : Design of the drop-off-pick-up zones in buildings : the case of private transportation at the female university of Riyadh Type de document : texte imprimé Auteurs : F. J. Otamendi, Auteur ; J. Laffond, Auteur ; N. S. Segundo, Auteur Année de publication : 2012 Article en page(s) : pp. 122–129 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Simulation Logistics Architecture Traffic Index. décimale : 001.424 Résumé : The design of the building that is going to hold the operations to pick-up the female students by private vehicles when classes are finished is presented for an Arabian university. The premises have been designed to maximize the capacity of the parking arrangement and maintain a constant and quick flow of vehicles within complex sociological constraints. Architects, traffic engineers and simulation specialists have concurrently designed a building that has to give service to 4500 vehicles within 1 h. The solution is based on three pillars: just-in-time, to simplify the tasks and laminate the demand so the flow rates are evenly distributed; information technologies, to maximize the probability of the students being ready when the corresponding vehicle arrives; and discrete-event simulation to abstract the complex procedures in a realistic, dynamic way and to visualize the movement so as to transmit credibility on the selected design to all the parties involved. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201119a.html [article] Design of the drop-off-pick-up zones in buildings : the case of private transportation at the female university of Riyadh [texte imprimé] / F. J. Otamendi, Auteur ; J. Laffond, Auteur ; N. S. Segundo, Auteur . - 2012 . - pp. 122–129.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 122–129
Mots-clés : Simulation Logistics Architecture Traffic Index. décimale : 001.424 Résumé : The design of the building that is going to hold the operations to pick-up the female students by private vehicles when classes are finished is presented for an Arabian university. The premises have been designed to maximize the capacity of the parking arrangement and maintain a constant and quick flow of vehicles within complex sociological constraints. Architects, traffic engineers and simulation specialists have concurrently designed a building that has to give service to 4500 vehicles within 1 h. The solution is based on three pillars: just-in-time, to simplify the tasks and laminate the demand so the flow rates are evenly distributed; information technologies, to maximize the probability of the students being ready when the corresponding vehicle arrives; and discrete-event simulation to abstract the complex procedures in a realistic, dynamic way and to visualize the movement so as to transmit credibility on the selected design to all the parties involved. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201119a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 130–137
Titre : Worst-case analysis for flow shop scheduling problems with an exponential learning effect Type de document : texte imprimé Auteurs : Wang, J.-B., Auteur ; M.-Z. Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 130–137 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling Flow shop Learning effect Worst-case analysis Index. décimale : 001.424 Résumé : A real industrial production phenomenon, referred to as learning effects, has drawn increasing attention. However, most research on this issue considers only single machine problems. Motivated by this limitation, this paper considers flow shop scheduling problems with an exponential learning effect. By the exponential learning effect, we mean that the processing time of a job is defined by an exponent function of its position in a processing permutation. The objective is to minimize one of the four regular performance criteria, namely, the total completion time, the total weighted completion time, the discounted total weighted completion time, and the sum of the quadratic job completion times. We present heuristic algorithms by using the optimal permutations for the corresponding single-machine scheduling problems. We also analyse the worst-case bound of our heuristic algorithms. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201140a.html [article] Worst-case analysis for flow shop scheduling problems with an exponential learning effect [texte imprimé] / Wang, J.-B., Auteur ; M.-Z. Wang, Auteur . - 2012 . - pp. 130–137.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 1 (Janvier 2012) . - pp. 130–137
Mots-clés : Scheduling Flow shop Learning effect Worst-case analysis Index. décimale : 001.424 Résumé : A real industrial production phenomenon, referred to as learning effects, has drawn increasing attention. However, most research on this issue considers only single machine problems. Motivated by this limitation, this paper considers flow shop scheduling problems with an exponential learning effect. By the exponential learning effect, we mean that the processing time of a job is defined by an exponent function of its position in a processing permutation. The objective is to minimize one of the four regular performance criteria, namely, the total completion time, the total weighted completion time, the discounted total weighted completion time, and the sum of the quadratic job completion times. We present heuristic algorithms by using the optimal permutations for the corresponding single-machine scheduling problems. We also analyse the worst-case bound of our heuristic algorithms. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n1/abs/jors201140a.html
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