Dépouillements

A Bayesian network structure for operational risk modelling in structured finance operations / A. D. Sanford in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 431–444 Titre : A Bayesian network structure for operational risk modelling in structured finance operations Type de document : texte imprimé Auteurs : A. D. Sanford, Auteur ; I. A. Moosa, Auteur Année de publication : 2012 Article en page(s) : pp. 431–444 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Banking  Bayesian  networks  Operational  risk  Cognitive  mapping  Artificial  intelligence Index. décimale : 001.424 Résumé : This paper is concerned with the design of a Bayesian network structure that is suitable for operational risk modelling. The model's structure is designed specifically from the perspective of a business unit operational risk manager whose role is to measure, record, predict, communicate, analyse and control operational risk within their unit. The problem domain modelled is a functioning structured finance operations unit within a major Australian bank. The network model design incorporates a number of existing human factor frameworks to account for human error and operational risk events within the domain. The design also supports a modular structure, allowing for the inclusion of many operational loss event types, making it adaptable to different operational risk environments. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors20117a.html [article] A Bayesian network structure for operational risk modelling in structured finance operations [texte imprimé] / A. D. Sanford, Auteur ; I. A. Moosa, Auteur . - 2012 . - pp. 431–444. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 431–444 Mots-clés : Banking  Bayesian  networks  Operational  risk  Cognitive  mapping  Artificial  intelligence Index. décimale : 001.424 Résumé : This paper is concerned with the design of a Bayesian network structure that is suitable for operational risk modelling. The model's structure is designed specifically from the perspective of a business unit operational risk manager whose role is to measure, record, predict, communicate, analyse and control operational risk within their unit. The problem domain modelled is a functioning structured finance operations unit within a major Australian bank. The network model design incorporates a number of existing human factor frameworks to account for human error and operational risk events within the domain. The design also supports a modular structure, allowing for the inclusion of many operational loss event types, making it adaptable to different operational risk environments. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors20117a.html

Minimizing the total completion time in a two-machine flowshop with sequence-independent setup times / T. Ladhari in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 445–459 Titre : Minimizing the total completion time in a two-machine flowshop with sequence-independent setup times Type de document : texte imprimé Auteurs : T. Ladhari, Auteur ; M. K. Msakni, Auteur ; A. Allahverdi, Auteur Année de publication : 2012 Article en page(s) : pp. 445–459 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling  Flowshop  Total  completion  time  Independent  setup  times  Heuristics  Genetic  local  search  algorithm Index. décimale : 001.424 Résumé : We consider the problem of minimizing the sum of completion times in a two-machine permutation flowshop subject to setup times. We propose a new priority rule, several constructive heuristics, local search procedures, as well as an effective multiple crossover genetic algorithm. Computational experiments carried out on a large set of randomly generated instances provide evidence that a constructive heuristic based on newly derived priority rule dominates all the proposed constructive heuristics. More specifically, we show that one of our proposed constructive heuristics outperforms the best constructive heuristic in the literature in terms of both error and computational time. Furthermore, we show that one of our proposed local search-based heuristics outperforms the best local search heuristic in the literature in terms of again both error and computational time. We also show that, in terms of quality-to-CPU time ratio, the multiple crossover genetic algorithm performs consistently well. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201137a.html [article] Minimizing the total completion time in a two-machine flowshop with sequence-independent setup times [texte imprimé] / T. Ladhari, Auteur ; M. K. Msakni, Auteur ; A. Allahverdi, Auteur . - 2012 . - pp. 445–459. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 445–459 Mots-clés : Scheduling  Flowshop  Total  completion  time  Independent  setup  times  Heuristics  Genetic  local  search  algorithm Index. décimale : 001.424 Résumé : We consider the problem of minimizing the sum of completion times in a two-machine permutation flowshop subject to setup times. We propose a new priority rule, several constructive heuristics, local search procedures, as well as an effective multiple crossover genetic algorithm. Computational experiments carried out on a large set of randomly generated instances provide evidence that a constructive heuristic based on newly derived priority rule dominates all the proposed constructive heuristics. More specifically, we show that one of our proposed constructive heuristics outperforms the best constructive heuristic in the literature in terms of both error and computational time. Furthermore, we show that one of our proposed local search-based heuristics outperforms the best local search heuristic in the literature in terms of again both error and computational time. We also show that, in terms of quality-to-CPU time ratio, the multiple crossover genetic algorithm performs consistently well. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201137a.html

A distributed algorithm for equitable bandwidth allocation for content distribution in a tree network / H. Luss in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 460–469 Titre : A distributed algorithm for equitable bandwidth allocation for content distribution in a tree network Type de document : texte imprimé Auteurs : H. Luss, Auteur Année de publication : 2012 Article en page(s) : pp. 460–469 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Telecommunications  Equitable  resource  allocation  Video-on-demand  Distributed  optimization Index. décimale : 001.424 Résumé : We present a distributed algorithm for bandwidth allocation for content distribution in tree networks, where the intensive computations are executed independently at the nodes while some information is exchanged among the nodes. The root node has a server that stores and broadcasts multiple programs requested at the nodes through links with limited capacity. The bandwidth allocated for a specific program can be decreased from one link to the next in a path from the root node to an end-node, but it cannot be increased. The objective is to determine equitable bandwidth allocations among all programs across all links, which leads to a formulation of a lexicographic maximin optimization model. The performance function at each of the nodes for a specific program represents customers’ satisfaction as a function of the incoming bandwidth into the node. The distributed algorithm that determines the equitable bandwidth allocations extends the algorithm described in Luss (2010). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201153a.html [article] A distributed algorithm for equitable bandwidth allocation for content distribution in a tree network [texte imprimé] / H. Luss, Auteur . - 2012 . - pp. 460–469. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 460–469 Mots-clés : Telecommunications  Equitable  resource  allocation  Video-on-demand  Distributed  optimization Index. décimale : 001.424 Résumé : We present a distributed algorithm for bandwidth allocation for content distribution in tree networks, where the intensive computations are executed independently at the nodes while some information is exchanged among the nodes. The root node has a server that stores and broadcasts multiple programs requested at the nodes through links with limited capacity. The bandwidth allocated for a specific program can be decreased from one link to the next in a path from the root node to an end-node, but it cannot be increased. The objective is to determine equitable bandwidth allocations among all programs across all links, which leads to a formulation of a lexicographic maximin optimization model. The performance function at each of the nodes for a specific program represents customers’ satisfaction as a function of the incoming bandwidth into the node. The distributed algorithm that determines the equitable bandwidth allocations extends the algorithm described in Luss (2010). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201153a.html

Inefficiency countervailed DEA (IC-DEA) method for assessing corporate environmental performance / Y-T Huang in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 470–477 Titre : Inefficiency countervailed DEA (IC-DEA) method for assessing corporate environmental performance Type de document : texte imprimé Auteurs : Y-T Huang, Auteur ; J-J. Kao, Auteur Année de publication : 2012 Article en page(s) : pp. 470–477 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Environmental  studies  Corporate  planning  Data  envelopment  analysis  Linear  programming  Optimization  Decision  analysis Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA) is a method frequently used to evaluate relative firm performance. However, high values in a few indicators can lead to a company being regarded as ‘efficient’, despite valuing poorly in other essential indicators. The Inefficiency Countervailed DEA (IC-DEA) method is thus developed. The method first defines an inefficient frontier using the proposed Reverse DEA (RDEA) model. An IC-DEA value is then determined by summing both the DEA and RDEA values. The IC-DEA method was applied to assess the environmental performance of major opto-electronic companies in Taiwan, demonstrating its applicability. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201156a.html [article] Inefficiency countervailed DEA (IC-DEA) method for assessing corporate environmental performance [texte imprimé] / Y-T Huang, Auteur ; J-J. Kao, Auteur . - 2012 . - pp. 470–477. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 470–477 Mots-clés : Environmental  studies  Corporate  planning  Data  envelopment  analysis  Linear  programming  Optimization  Decision  analysis Index. décimale : 001.424 Résumé : Data envelopment analysis (DEA) is a method frequently used to evaluate relative firm performance. However, high values in a few indicators can lead to a company being regarded as ‘efficient’, despite valuing poorly in other essential indicators. The Inefficiency Countervailed DEA (IC-DEA) method is thus developed. The method first defines an inefficient frontier using the proposed Reverse DEA (RDEA) model. An IC-DEA value is then determined by summing both the DEA and RDEA values. The IC-DEA method was applied to assess the environmental performance of major opto-electronic companies in Taiwan, demonstrating its applicability. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201156a.html

A revised Inno-Qual performance system for higher education / I-Shuo Chen in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 478–488 Titre : A revised Inno-Qual performance system for higher education : the integrated applications of DEMATEL and ANP Type de document : texte imprimé Auteurs : I-Shuo Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 478–488 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Innovation  Total  quality  management  Inno-Qual  performance  system  (IQPS)  DEMATEL  ANP  Higher  education Index. décimale : 001.424 Résumé : The Taiwanese higher education system has historically been a sustainable resource, providing a competitive advantage for Taiwan. However, its performance has recently decreased relative to other countries. Improving innovation and total quality management (TQM) performance has become important to increase the competitive advantage and survival rate of universities. The Inno-Qual performance system (IQPS) is the latest model to evaluate innovation and TQM performance in Taiwanese institutions of higher education. The IQPS not only addresses major technical problems that could damage the reliability of evaluation outcomes, but it also stresses that half of the universities have not efficiently improved their innovation and TQM performance simultaneously. However, criteria and weights for innovation and TQM dimensions of the IQPS are separated to consider internal and external organizational performance independently. This results in inconsistency between the weights, resulting in lack of a clear direction for making improvements, which makes the performance evaluation results impossible to confirm. Furthermore, the innovation weights ignore the effects of the TQM dimensions due to the separation, making the system irrational and invalid in the real world. The purpose of this study is to revise the current IQPS and overcome these two drawbacks by using the decision-making trial and evaluation laboratory application and the analytic network process. With a method that is efficient, less costly, and provides verifiable results, our revised IQPS can help improve innovation and TQM performance in today's universities. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201157a.html [article] A revised Inno-Qual performance system for higher education : the integrated applications of DEMATEL and ANP [texte imprimé] / I-Shuo Chen, Auteur . - 2012 . - pp. 478–488. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 478–488 Mots-clés : Innovation  Total  quality  management  Inno-Qual  performance  system  (IQPS)  DEMATEL  ANP  Higher  education Index. décimale : 001.424 Résumé : The Taiwanese higher education system has historically been a sustainable resource, providing a competitive advantage for Taiwan. However, its performance has recently decreased relative to other countries. Improving innovation and total quality management (TQM) performance has become important to increase the competitive advantage and survival rate of universities. The Inno-Qual performance system (IQPS) is the latest model to evaluate innovation and TQM performance in Taiwanese institutions of higher education. The IQPS not only addresses major technical problems that could damage the reliability of evaluation outcomes, but it also stresses that half of the universities have not efficiently improved their innovation and TQM performance simultaneously. However, criteria and weights for innovation and TQM dimensions of the IQPS are separated to consider internal and external organizational performance independently. This results in inconsistency between the weights, resulting in lack of a clear direction for making improvements, which makes the performance evaluation results impossible to confirm. Furthermore, the innovation weights ignore the effects of the TQM dimensions due to the separation, making the system irrational and invalid in the real world. The purpose of this study is to revise the current IQPS and overcome these two drawbacks by using the decision-making trial and evaluation laboratory application and the analytic network process. With a method that is efficient, less costly, and provides verifiable results, our revised IQPS can help improve innovation and TQM performance in today's universities. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201157a.html

A tabu search algorithm applied to the staffing roster problem of Leicestershire police force / O. S. S. T. Edleston in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 489–496 Titre : A tabu search algorithm applied to the staffing roster problem of Leicestershire police force Type de document : texte imprimé Auteurs : O. S. S. T. Edleston, Auteur ; L. M. Bartlett, Auteur Année de publication : 2012 Article en page(s) : pp. 489–496 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Tabu  search  Staff  rostering  Police  Optimisation Index. décimale : 001.424 Résumé : This paper presents an application of the tabu search algorithm to a staff rostering problem relevant to Leicestershire Police. The aim is to address the issue of structuring staff rosters to enable effective use of staff to meet the demand on the Police to reduce and deal with crime-related incidents. This problem is defined through the compilation of a time-varying level of required staff and an associated staff roster. The objective is an optimised work set-up, maximising staff resources and the meeting of demand. Optimisation of staff levels to demand is sought through use of a series of tabu search algorithms, making use of two diversification techniques and an intensification technique individually and in compilation. The tabu search is shown to be a well-suited optimisation approach to the type of problem defined, with individual conclusions drawn for each of the technique combinations used. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201144a.html [article] A tabu search algorithm applied to the staffing roster problem of Leicestershire police force [texte imprimé] / O. S. S. T. Edleston, Auteur ; L. M. Bartlett, Auteur . - 2012 . - pp. 489–496. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 489–496 Mots-clés : Tabu  search  Staff  rostering  Police  Optimisation Index. décimale : 001.424 Résumé : This paper presents an application of the tabu search algorithm to a staff rostering problem relevant to Leicestershire Police. The aim is to address the issue of structuring staff rosters to enable effective use of staff to meet the demand on the Police to reduce and deal with crime-related incidents. This problem is defined through the compilation of a time-varying level of required staff and an associated staff roster. The objective is an optimised work set-up, maximising staff resources and the meeting of demand. Optimisation of staff levels to demand is sought through use of a series of tabu search algorithms, making use of two diversification techniques and an intensification technique individually and in compilation. The tabu search is shown to be a well-suited optimisation approach to the type of problem defined, with individual conclusions drawn for each of the technique combinations used. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201144a.html

Inventory control for point-of-use locations in hospitals / M. Bijvank in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 497–510 Titre : Inventory control for point-of-use locations in hospitals Type de document : texte imprimé Auteurs : M. Bijvank, Auteur ; F. A. Vis, Auteur Année de publication : 2012 Article en page(s) : pp. 497–510 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Health  service  Inventory  Service  level  Capacity  limitations  Heuristics Index. décimale : 001.424 Résumé : Most inventory management systems at hospital departments are characterised by lost sales, periodic reviews with short lead times, and limited storage capacity. We develop two types of exact models that deal with all these characteristics. In a capacity model, the service level is maximised subject to a capacity restriction, and in a service model the required capacity is minimised subject to a service level restriction. We also formulate approximation models applicable for any lost-sales inventory system (cost objective, no lead time restrictions etc). For the capacity model, we develop a simple inventory rule to set the reorder levels and order quantities. Numerical results for this inventory rule show an average deviation of 1% from the optimal service levels. We also embed the single-item models in a multi-item system. Furthermore, we compare the performance of fixed order size replenishment policies and (R, s, S) policies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201152a.html [article] Inventory control for point-of-use locations in hospitals [texte imprimé] / M. Bijvank, Auteur ; F. A. Vis, Auteur . - 2012 . - pp. 497–510. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 497–510 Mots-clés : Health  service  Inventory  Service  level  Capacity  limitations  Heuristics Index. décimale : 001.424 Résumé : Most inventory management systems at hospital departments are characterised by lost sales, periodic reviews with short lead times, and limited storage capacity. We develop two types of exact models that deal with all these characteristics. In a capacity model, the service level is maximised subject to a capacity restriction, and in a service model the required capacity is minimised subject to a service level restriction. We also formulate approximation models applicable for any lost-sales inventory system (cost objective, no lead time restrictions etc). For the capacity model, we develop a simple inventory rule to set the reorder levels and order quantities. Numerical results for this inventory rule show an average deviation of 1% from the optimal service levels. We also embed the single-item models in a multi-item system. Furthermore, we compare the performance of fixed order size replenishment policies and (R, s, S) policies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201152a.html

Simulating student flow through a college of business for policy and structural change analysis / R. M. Saltzman in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 511–523 Titre : Simulating student flow through a college of business for policy and structural change analysis Type de document : texte imprimé Auteurs : R. M. Saltzman, Auteur ; T. M. Roeder, Auteur Année de publication : 2012 Article en page(s) : pp. 511–523 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Education  Organizational  studies  Planning  Simulation Index. décimale : 001.424 Résumé : Under the pressure of sharp budget cuts and external demands for better performance, public institutions of higher education must examine how they can facilitate student graduation even as institutional resources diminish. This paper describes a computer model simulating the movement of undergraduates through a large, public college of business. The model allows changes in curriculum policy, prerequisite structure, and staffing capacity to be tested prior to implementation. Outcome measures focus primarily on the expected time to degree of two types of students who enter the university, first-time freshmen and upper division transfers, along with their respective 6-year and 4-year graduation rates. The validated model is used to experiment with both actual and potential scenarios facing the college and gauge their possible impact. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201159a.html [article] Simulating student flow through a college of business for policy and structural change analysis [texte imprimé] / R. M. Saltzman, Auteur ; T. M. Roeder, Auteur . - 2012 . - pp. 511–523. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 511–523 Mots-clés : Education  Organizational  studies  Planning  Simulation Index. décimale : 001.424 Résumé : Under the pressure of sharp budget cuts and external demands for better performance, public institutions of higher education must examine how they can facilitate student graduation even as institutional resources diminish. This paper describes a computer model simulating the movement of undergraduates through a large, public college of business. The model allows changes in curriculum policy, prerequisite structure, and staffing capacity to be tested prior to implementation. Outcome measures focus primarily on the expected time to degree of two types of students who enter the university, first-time freshmen and upper division transfers, along with their respective 6-year and 4-year graduation rates. The validated model is used to experiment with both actual and potential scenarios facing the college and gauge their possible impact. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201159a.html

Complexity of scheduling of coupled tasks with chains precedence constraints and any constant length of gap / K. Ecker in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 524–529 Titre : Complexity of scheduling of coupled tasks with chains precedence constraints and any constant length of gap Type de document : texte imprimé Auteurs : K. Ecker, Auteur ; M. Tanas, Auteur Année de publication : 2012 Article en page(s) : pp. 524–529 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Coupled  tasks  Scheduling  Complexity  theory Index. décimale : 001.424 Résumé : Coupled tasks scheduling was originally introduced for modelling complex radar devices. It is still used for controlling such devices and applied in similar applications. This paper considers a problem of coupled tasks scheduling on one processor, under the assumptions that all processing times are equal to 1, the gap has a constant exact length and the precedence constraints are strict. Although it is proven that the problem stated above is NP-hard in the strong sense if the precedence constraints have a form of a general graph, it is possible to solve some of its relaxed versions in polynomial time. This paper contains a solution for the problem of coupled tasks scheduling with an assumption that the precedence constraints graph has a form of chains and it presents an algorithm that can solve the problem with such assumption in time O(n log n). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201132a.html [article] Complexity of scheduling of coupled tasks with chains precedence constraints and any constant length of gap [texte imprimé] / K. Ecker, Auteur ; M. Tanas, Auteur . - 2012 . - pp. 524–529. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 524–529 Mots-clés : Coupled  tasks  Scheduling  Complexity  theory Index. décimale : 001.424 Résumé : Coupled tasks scheduling was originally introduced for modelling complex radar devices. It is still used for controlling such devices and applied in similar applications. This paper considers a problem of coupled tasks scheduling on one processor, under the assumptions that all processing times are equal to 1, the gap has a constant exact length and the precedence constraints are strict. Although it is proven that the problem stated above is NP-hard in the strong sense if the precedence constraints have a form of a general graph, it is possible to solve some of its relaxed versions in polynomial time. This paper contains a solution for the problem of coupled tasks scheduling with an assumption that the precedence constraints graph has a form of chains and it presents an algorithm that can solve the problem with such assumption in time O(n log n). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201132a.html

A multiobjective stochastic program for hospital bed planning / F. Ben Abdelaziz in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 530–538 Titre : A multiobjective stochastic program for hospital bed planning Type de document : texte imprimé Auteurs : F. Ben Abdelaziz, Auteur ; M. Masmoudi, Auteur Année de publication : 2012 Article en page(s) : pp. 530–538 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Hospital  bed  capacity  management  Multiobjective  stochastic  programming  Goal  programming  Chance  constrained  approach  Recourse  approach Index. décimale : 001.424 Résumé : In this paper, we study hospital bed capacity management for a set of existing hospitals when the demand for beds is random. We propose a multiobjective stochastic program model to assign beds to hospital departments. We consider three objective functions to be minimized, which are the cost of creation and management of new beds and the number of nurses and physicians working in these hospitals, subject to demand satisfaction of three kinds of health-care specialities. A certainty equivalent program was derived based on a mixture between the chance constrained approach, the recourse approach and the goal programming approach. Empirical results using real data from 157 Tunisian national hospitals are reported. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201139a.html [article] A multiobjective stochastic program for hospital bed planning [texte imprimé] / F. Ben Abdelaziz, Auteur ; M. Masmoudi, Auteur . - 2012 . - pp. 530–538. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 530–538 Mots-clés : Hospital  bed  capacity  management  Multiobjective  stochastic  programming  Goal  programming  Chance  constrained  approach  Recourse  approach Index. décimale : 001.424 Résumé : In this paper, we study hospital bed capacity management for a set of existing hospitals when the demand for beds is random. We propose a multiobjective stochastic program model to assign beds to hospital departments. We consider three objective functions to be minimized, which are the cost of creation and management of new beds and the number of nurses and physicians working in these hospitals, subject to demand satisfaction of three kinds of health-care specialities. A certainty equivalent program was derived based on a mixture between the chance constrained approach, the recourse approach and the goal programming approach. Empirical results using real data from 157 Tunisian national hospitals are reported. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201139a.html

Predicting default of a small business using different definitions of financial distress / S-M. Lin in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 539–548 Titre : Predicting default of a small business using different definitions of financial distress Type de document : texte imprimé Auteurs : S-M. Lin, Auteur ; J. Ansell, Auteur ; G. Andreeva, Auteur Année de publication : 2012 Article en page(s) : pp. 539–548 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Credit  scoring  Small  business  Risk  Banking  Coarse  classification Index. décimale : 001.424 Résumé : The paper introduces a number of risk-rating models for UK small businesses applying an accounting-based approach, which uses financial ratios to predict corporate bankruptcy. An enhancement to these models is considered through features typical to retail credit risk modelling. A common problem of default prediction consists in the relatively small number of bankruptcies or real defaults available for model-building. In order to expand the ‘default’ group beyond bankrupt companies, the paper considers adopting four different definitions of ‘a failing business’ by investigating combinations of financial distress levels. The impact of each default definition on the choice of predictor variables and on the model's predictive accuracy is explored. In addition, the paper examines the value of categorizing financial ratios used as predictor variables. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201165a.html [article] Predicting default of a small business using different definitions of financial distress [texte imprimé] / S-M. Lin, Auteur ; J. Ansell, Auteur ; G. Andreeva, Auteur . - 2012 . - pp. 539–548. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 539–548 Mots-clés : Credit  scoring  Small  business  Risk  Banking  Coarse  classification Index. décimale : 001.424 Résumé : The paper introduces a number of risk-rating models for UK small businesses applying an accounting-based approach, which uses financial ratios to predict corporate bankruptcy. An enhancement to these models is considered through features typical to retail credit risk modelling. A common problem of default prediction consists in the relatively small number of bankruptcies or real defaults available for model-building. In order to expand the ‘default’ group beyond bankrupt companies, the paper considers adopting four different definitions of ‘a failing business’ by investigating combinations of financial distress levels. The impact of each default definition on the choice of predictor variables and on the model's predictive accuracy is explored. In addition, the paper examines the value of categorizing financial ratios used as predictor variables. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201165a.html

Applying a hybrid DEA model to evaluate the influence of marketing activities to operational efficiency on Taiwan’s international tourist hotels / C-W. Huang in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 549–560 Titre : Applying a hybrid DEA model to evaluate the influence of marketing activities to operational efficiency on Taiwan’s international tourist hotels Type de document : texte imprimé Auteurs : C-W. Huang, Auteur ; Y-H. Chiu, Auteur ; C-T. Ting, Auteur Année de publication : 2012 Article en page(s) : pp. 549–560 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data  envelopment  analysis  Operational  efficiency  Marketing  Technology  gap  Hotels Index. décimale : 001.424 Résumé : This study uses the hybrid DEA model, in which the proportionate inputs are evaluated with a radial measure and the non-proportionate inputs are evaluated with a non-radial measure in order to evaluate the impact of marketing expense on the efficiency of Taiwan's international tourist hotels. We further introduce the hybrid DEA into the technology gap measurement to evaluate the technology gaps of marketing expense utilization between different operating types. The empirical results indicate that the inefficiency caused from excess marketing expense is the main reason for lower efficiency in many tourist hotels, especially to chain-operated hotels and hotels that cater to domestic clients. Through the hybrid technology gap measurement, we find that the utilization of marketing resources is more effective for independent, city type hotels, as well as those that cater to international clients. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201158a.html [article] Applying a hybrid DEA model to evaluate the influence of marketing activities to operational efficiency on Taiwan’s international tourist hotels [texte imprimé] / C-W. Huang, Auteur ; Y-H. Chiu, Auteur ; C-T. Ting, Auteur . - 2012 . - pp. 549–560. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 549–560 Mots-clés : Data  envelopment  analysis  Operational  efficiency  Marketing  Technology  gap  Hotels Index. décimale : 001.424 Résumé : This study uses the hybrid DEA model, in which the proportionate inputs are evaluated with a radial measure and the non-proportionate inputs are evaluated with a non-radial measure in order to evaluate the impact of marketing expense on the efficiency of Taiwan's international tourist hotels. We further introduce the hybrid DEA into the technology gap measurement to evaluate the technology gaps of marketing expense utilization between different operating types. The empirical results indicate that the inefficiency caused from excess marketing expense is the main reason for lower efficiency in many tourist hotels, especially to chain-operated hotels and hotels that cater to domestic clients. Through the hybrid technology gap measurement, we find that the utilization of marketing resources is more effective for independent, city type hotels, as well as those that cater to international clients. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201158a.html

The relevance of educational background for doing simulation / B. Atkinson in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 561–563 Titre : The relevance of educational background for doing simulation Type de document : texte imprimé Auteurs : B. Atkinson, Auteur Année de publication : 2012 Article en page(s) : pp. 561–563 Langues : Anglais (eng) Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201168a.html [article] The relevance of educational background for doing simulation [texte imprimé] / B. Atkinson, Auteur . - 2012 . - pp. 561–563. Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 561–563 Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/abs/jors201168a.html

To generalize or not to generalize? / B. Sampaio in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - PP. 563-565 Titre : To generalize or not to generalize? : Comment on Robinson and Davies Type de document : texte imprimé Auteurs : B. Sampaio, Auteur Année de publication : 2012 Article en page(s) : PP. 563-565 Note générale : Recherche opérationnelle Langues : Anglais (eng) Index. décimale : 001.424 Note de contenu : Recently, Robinson and Davies (2010) published an article investigating the effect of educational background on performance in simulation studies. They highlight the importance of the subject by emphasizing that when organizations advertise a job that involves developing and using simulation models, they must choose the most effective candidates among a choice set that potentially contains individuals with very different backgrounds. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201169a.html [article] To generalize or not to generalize? : Comment on Robinson and Davies [texte imprimé] / B. Sampaio, Auteur . - 2012 . - PP. 563-565. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - PP. 563-565 Index. décimale : 001.424 Note de contenu : Recently, Robinson and Davies (2010) published an article investigating the effect of educational background on performance in simulation studies. They highlight the importance of the subject by emphasizing that when organizations advertise a job that involves developing and using simulation models, they must choose the most effective candidates among a choice set that potentially contains individuals with very different backgrounds. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201169a.html

Response to comments on Robinson and Davies (2010) / S. Robinson in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 565-566 Titre : Response to comments on Robinson and Davies (2010) Type de document : texte imprimé Auteurs : S. Robinson, Auteur Année de publication : 2012 Article en page(s) : pp. 565-566 Note générale : Recherche opérationnelle Langues : Anglais (eng) Index. décimale : 001.424 Note de contenu : First I would like to thank Bruno Sampaio and Ben Atkinson for taking the time to provide insightful comments on our paper (Robinson and Davies, 2010). It is pleasing to have generated such a debate. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201167a.html [article] Response to comments on Robinson and Davies (2010) [texte imprimé] / S. Robinson, Auteur . - 2012 . - pp. 565-566. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - pp. 565-566 Index. décimale : 001.424 Note de contenu : First I would like to thank Bruno Sampaio and Ben Atkinson for taking the time to provide insightful comments on our paper (Robinson and Davies, 2010). It is pleasing to have generated such a debate. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201167a.html

Minimizing total flow time in the single-machine scheduling problem with periodic maintenance / D. Xu in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - p. 567 Titre : Minimizing total flow time in the single-machine scheduling problem with periodic maintenance Type de document : texte imprimé Auteurs : D. Xu, Auteur ; S. Xiong, Auteur Année de publication : 2012 Article en page(s) : p. 567 Note générale : Recherche opérationnelle Langues : Anglais (eng) Index. décimale : 001.424 Note de contenu : As we observe, the numerical example proposed by Chen (2006) is incorrect because the author does not follow the steps of their proposal heuristic algorithm to illustrate example 1. According to Step 1(i) of the heuristic algorithm proposed by Chen, we should have three batches each with a total processing time of T=8. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201171a.html [article] Minimizing total flow time in the single-machine scheduling problem with periodic maintenance [texte imprimé] / D. Xu, Auteur ; S. Xiong, Auteur . - 2012 . - p. 567. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - p. 567 Index. décimale : 001.424 Note de contenu : As we observe, the numerical example proposed by Chen (2006) is incorrect because the author does not follow the steps of their proposal heuristic algorithm to illustrate example 1. According to Step 1(i) of the heuristic algorithm proposed by Chen, we should have three batches each with a total processing time of T=8. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201171a.html

Response to Xu and Xiong / W. J. Chen in Journal of the operational research society (JORS), Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - p. 567 Titre : Response to Xu and Xiong Type de document : texte imprimé Auteurs : W. J. Chen, Auteur Année de publication : 2012 Article en page(s) : p. 567 Note générale : Recherche opérationnelle Langues : Anglais (eng) Index. décimale : 001.424 Note de contenu : Using Steps 1–3 of the heuristic, we can obtain many schedules. One of the schedules is the one presented in Table 6 (in the original article). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201170a.html [article] Response to Xu and Xiong [texte imprimé] / W. J. Chen, Auteur . - 2012 . - p. 567. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 4 (Avril 2012) . - p. 567 Index. décimale : 001.424 Note de contenu : Using Steps 1–3 of the heuristic, we can obtain many schedules. One of the schedules is the one presented in Table 6 (in the original article). DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n4/full/jors201170a.html

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