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Journal of the operational research society (JORS) |
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Ajouter le résultat dans votre panierMathematical expressions for the transit time of merchandise through a liner shipping network / J. F. Álvarez in Journal of the operational research society (JORS), Vol. 63 N° 6 (Juin 2012)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 709–714
Titre : Mathematical expressions for the transit time of merchandise through a liner shipping network Type de document : texte imprimé Auteurs : J. F. Álvarez, Auteur Année de publication : 2012 Article en page(s) : pp. 709–714 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Sea transport Logistics Integer programming Level of service Index. décimale : 001.424 Résumé : Recent publications on the design of liner shipping networks are limited in their treatment of the level of service (LoS) experienced by shippers. We propose the use of inventory holding costs—a function of merchandise transit time—as a proxy for LoS. We assume the existence of a two-tier optimization model, where fleet deployment, vessel routing, and vessel speed are determined in the higher tier. Merchandise flows and transshipment quantities are determined in the lower tier. We partition the total merchandise transit time into time spent in open waters, time spent during port calls, and time spent dwelling in the terminal yard. Using the notions of service frequency and service phase, we develop mathematical expressions for the three aforementioned quantities within the lower tier of the optimization model. We arrive at a bilinear expression for overall inventory holding costs that is suitable for liner shipping network design. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201172a.html [article] Mathematical expressions for the transit time of merchandise through a liner shipping network [texte imprimé] / J. F. Álvarez, Auteur . - 2012 . - pp. 709–714.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 709–714
Mots-clés : Sea transport Logistics Integer programming Level of service Index. décimale : 001.424 Résumé : Recent publications on the design of liner shipping networks are limited in their treatment of the level of service (LoS) experienced by shippers. We propose the use of inventory holding costs—a function of merchandise transit time—as a proxy for LoS. We assume the existence of a two-tier optimization model, where fleet deployment, vessel routing, and vessel speed are determined in the higher tier. Merchandise flows and transshipment quantities are determined in the lower tier. We partition the total merchandise transit time into time spent in open waters, time spent during port calls, and time spent dwelling in the terminal yard. Using the notions of service frequency and service phase, we develop mathematical expressions for the three aforementioned quantities within the lower tier of the optimization model. We arrive at a bilinear expression for overall inventory holding costs that is suitable for liner shipping network design. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201172a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 715–725
Titre : Evaluation of China's regional hospital efficiency: DEA approach with undesirable output Type de document : texte imprimé Auteurs : Hu, Henry H., Auteur ; Q. Qi, Auteur ; C.-H. Yang, Auteur Année de publication : 2012 Article en page(s) : pp. 715–725 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Hospital Efficiency Undesirable output DEA Index. décimale : 001.424 Résumé : This paper investigates regional hospital efficiency in China. As hospital operations naturally increase along with an undesirable output of patient mortality, which may induce medical disputes and ligations, this study adopts data envelopment analysis to evaluate and compare the efficiency scores obtained with and without considering the undesirable output. On the basis of province-level panel data over 2002–2008 and considering the risk-adjusted undesirable output, empirical estimates indicate that hospital efficiency is moderate, but increases gradually from 0.6881 to 0.8159. Importantly, without considering the undesirable output, the average efficiency score is overestimated and the efficiency ranking across provinces changes considerably. An efficiency gap is found between coastal and non-coastal regions, but this gap’s drop is mainly contributed by the fast efficiency improvement of the western regions. However, the central regions continue to achieve a significantly lower efficiency score than the eastern and western regions. Moreover, the initiation of the New Rural Cooperative Medical System has overall enhanced hospital efficiency in China, especially for the non-coastal regions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201177a.html [article] Evaluation of China's regional hospital efficiency: DEA approach with undesirable output [texte imprimé] / Hu, Henry H., Auteur ; Q. Qi, Auteur ; C.-H. Yang, Auteur . - 2012 . - pp. 715–725.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 715–725
Mots-clés : Hospital Efficiency Undesirable output DEA Index. décimale : 001.424 Résumé : This paper investigates regional hospital efficiency in China. As hospital operations naturally increase along with an undesirable output of patient mortality, which may induce medical disputes and ligations, this study adopts data envelopment analysis to evaluate and compare the efficiency scores obtained with and without considering the undesirable output. On the basis of province-level panel data over 2002–2008 and considering the risk-adjusted undesirable output, empirical estimates indicate that hospital efficiency is moderate, but increases gradually from 0.6881 to 0.8159. Importantly, without considering the undesirable output, the average efficiency score is overestimated and the efficiency ranking across provinces changes considerably. An efficiency gap is found between coastal and non-coastal regions, but this gap’s drop is mainly contributed by the fast efficiency improvement of the western regions. However, the central regions continue to achieve a significantly lower efficiency score than the eastern and western regions. Moreover, the initiation of the New Rural Cooperative Medical System has overall enhanced hospital efficiency in China, especially for the non-coastal regions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201177a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 726–735
Titre : The timing and deterrence of terrorist attacks due to exogenous dynamics Type de document : texte imprimé Auteurs : K. Hausken, Auteur ; J. Zhuang, Auteur Année de publication : 2012 Article en page(s) : pp. 726–735 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Terrorism Terror capacity Threat Conflict Dynamics Contest success function Index. décimale : 001.424 Résumé : In this paper, we develop a model for the timing and deterrence of terrorist attacks due to exogenous dynamics. The defender moves first and the attacker second in a two-stage game which is repeated over T periods. We study the effects of dynamics of several critical components of counter-terrorism games, including the unit defence costs (eg, immediately after an attack, the defender would easily acquire defensive funding), unit attack costs (eg, the attacker may accumulate resources as time goes), and the asset valuation (eg, the asset valuation may change over time). We study deterministic dynamics and conduct simulations using random dynamics. We determine the timing of terrorist attacks and how these can be deterred. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201179a.html [article] The timing and deterrence of terrorist attacks due to exogenous dynamics [texte imprimé] / K. Hausken, Auteur ; J. Zhuang, Auteur . - 2012 . - pp. 726–735.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 726–735
Mots-clés : Terrorism Terror capacity Threat Conflict Dynamics Contest success function Index. décimale : 001.424 Résumé : In this paper, we develop a model for the timing and deterrence of terrorist attacks due to exogenous dynamics. The defender moves first and the attacker second in a two-stage game which is repeated over T periods. We study the effects of dynamics of several critical components of counter-terrorism games, including the unit defence costs (eg, immediately after an attack, the defender would easily acquire defensive funding), unit attack costs (eg, the attacker may accumulate resources as time goes), and the asset valuation (eg, the asset valuation may change over time). We study deterministic dynamics and conduct simulations using random dynamics. We determine the timing of terrorist attacks and how these can be deterred. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201179a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 736–747
Titre : Group inquiry to aid organisational learning in enterprises Type de document : texte imprimé Auteurs : M. Read, Auteur ; T. Gear, Auteur ; R. Vince, Auteur Année de publication : 2012 Article en page(s) : pp. 736–747 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Group support systems Organisational learning Situated knowledge Index. décimale : 001.424 Résumé : This paper describes a method for surfacing and exploring ‘situated knowledge’ in medium-sized organisations, with employee groups utilising a ‘low impact’ form of group support system (GSS), based on wireless handsets. Some results of piloting this method are summarised and one intervention is presented in detail. The method encouraged organisational members to give voice to the emotions and politics of leadership and learning in organisations, and helped to articulate how situated knowledge was ignored, as well as utilised. The method is practical, and may be used by organisations for themselves to aid the development of group as well as individual reflection, to stimulate the consideration of change. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201180a.html [article] Group inquiry to aid organisational learning in enterprises [texte imprimé] / M. Read, Auteur ; T. Gear, Auteur ; R. Vince, Auteur . - 2012 . - pp. 736–747.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 736–747
Mots-clés : Group support systems Organisational learning Situated knowledge Index. décimale : 001.424 Résumé : This paper describes a method for surfacing and exploring ‘situated knowledge’ in medium-sized organisations, with employee groups utilising a ‘low impact’ form of group support system (GSS), based on wireless handsets. Some results of piloting this method are summarised and one intervention is presented in detail. The method encouraged organisational members to give voice to the emotions and politics of leadership and learning in organisations, and helped to articulate how situated knowledge was ignored, as well as utilised. The method is practical, and may be used by organisations for themselves to aid the development of group as well as individual reflection, to stimulate the consideration of change. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201180a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 748–761
Titre : The management of change and the Viplan Methodology in practice Type de document : texte imprimé Auteurs : S. A. Harwood, Auteur Année de publication : 2012 Article en page(s) : pp. 748–761 Note générale : Opaeartional research Langues : Anglais (eng) Mots-clés : Problem structuring methods Organisational change Cybernetics Systems Methodology Index. décimale : 001.424 Résumé : Conventional approaches to change management tend to be prescriptive with the assumption that the specific course of action will lead to the intended outcome, with surprise when this does not materialise as expected. This possibly can be attributed to a failure to understand the context of change and thereby the failure to deal with conditions less than conducive to supporting the desired change. This paper presents Raul Espejo's Viplan Methodology as an appropriate framework to examine the context of change in an explicit and structured manner and thereby support the creation of conditions more conducive to change, thus increasing the likelihood of the desired outcomes. It draws upon the author's experience as a practitioner engaged in effecting operational change within UK small and medium-sized enterprises. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201173a.html [article] The management of change and the Viplan Methodology in practice [texte imprimé] / S. A. Harwood, Auteur . - 2012 . - pp. 748–761.
Opaeartional research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 748–761
Mots-clés : Problem structuring methods Organisational change Cybernetics Systems Methodology Index. décimale : 001.424 Résumé : Conventional approaches to change management tend to be prescriptive with the assumption that the specific course of action will lead to the intended outcome, with surprise when this does not materialise as expected. This possibly can be attributed to a failure to understand the context of change and thereby the failure to deal with conditions less than conducive to supporting the desired change. This paper presents Raul Espejo's Viplan Methodology as an appropriate framework to examine the context of change in an explicit and structured manner and thereby support the creation of conditions more conducive to change, thus increasing the likelihood of the desired outcomes. It draws upon the author's experience as a practitioner engaged in effecting operational change within UK small and medium-sized enterprises. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201173a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 762–770
Titre : Modelling a property's time to sale by inflating its previous selling price Type de document : texte imprimé Auteurs : A. Brint, Auteur Année de publication : 2012 Article en page(s) : pp. 762–770 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Statistics Survival analysis Housing Bidding Index. décimale : 001.424 Résumé : The modelling of the time to sale for residential property is complex because of complicating factors such as properties changing their price or being withdrawn from sale, changing market conditions, the presence of submarkets, whether the property represents ‘good value’, and seller motivation. This paper analyses a data set of modern properties that contains information about their previous selling price. This information is used to value the properties instead of the standard method of regressing on the physical characteristics of the properties. A survival analysis approach is then used to model the time to sale with this time being adjusted to take into account changing market circumstances and alterations to the list price during this period. It is found that the hazard rate for selling a property is approximately constant for the first 9 months a property is marketed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201174a.html [article] Modelling a property's time to sale by inflating its previous selling price [texte imprimé] / A. Brint, Auteur . - 2012 . - pp. 762–770.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 762–770
Mots-clés : Statistics Survival analysis Housing Bidding Index. décimale : 001.424 Résumé : The modelling of the time to sale for residential property is complex because of complicating factors such as properties changing their price or being withdrawn from sale, changing market conditions, the presence of submarkets, whether the property represents ‘good value’, and seller motivation. This paper analyses a data set of modern properties that contains information about their previous selling price. This information is used to value the properties instead of the standard method of regressing on the physical characteristics of the properties. A survival analysis approach is then used to model the time to sale with this time being adjusted to take into account changing market circumstances and alterations to the list price during this period. It is found that the hazard rate for selling a property is approximately constant for the first 9 months a property is marketed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201174a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 771–789
Titre : Solving the multi-commodity capacitated multi-facility Weber problem using Lagrangean relaxation and a subgradient-like algorithm Type de document : texte imprimé Auteurs : M. H. Akyüz, Auteur ; T. Öncan, Auteur ; Altinel, I. K., Auteur Année de publication : 2012 Article en page(s) : pp. 771–789 Note générale : Operational research Langues : Anglais (eng) Mots-clés : multi-commodity facility location allocation Lagrangean relaxation Discrete approximation Index. décimale : 001.424 Résumé : The Multi-commodity Capacitated Multi-facility Weber Problem (MCMWP) is concerned with locating I-capacitated facilities in the plane in order to satisfy the demands of J customers for K commodities so that the total transportation cost is minimized. We propose a Lagrangean relaxation scheme and a subgradient-like algorithm based on the relaxation of the capacity and commodity bundle constraints. The resulting subproblem is a variant of the well-known Multi-facility Weber Problem and it can be solved by using column generation and branch-and-price on an equivalent set covering formulation, which is accurate but extremely inefficient. Therefore, we devise different strategies to increase the efficiency. They mainly benefit from the effective usage of the lower and upper bounds on the optimal value of the Lagrangean subproblem. On the basis of extensive computational tests, we can say that they increase the efficiency considerably and result in accurate Lagrangean heuristics. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201181a.html [article] Solving the multi-commodity capacitated multi-facility Weber problem using Lagrangean relaxation and a subgradient-like algorithm [texte imprimé] / M. H. Akyüz, Auteur ; T. Öncan, Auteur ; Altinel, I. K., Auteur . - 2012 . - pp. 771–789.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 771–789
Mots-clés : multi-commodity facility location allocation Lagrangean relaxation Discrete approximation Index. décimale : 001.424 Résumé : The Multi-commodity Capacitated Multi-facility Weber Problem (MCMWP) is concerned with locating I-capacitated facilities in the plane in order to satisfy the demands of J customers for K commodities so that the total transportation cost is minimized. We propose a Lagrangean relaxation scheme and a subgradient-like algorithm based on the relaxation of the capacity and commodity bundle constraints. The resulting subproblem is a variant of the well-known Multi-facility Weber Problem and it can be solved by using column generation and branch-and-price on an equivalent set covering formulation, which is accurate but extremely inefficient. Therefore, we devise different strategies to increase the efficiency. They mainly benefit from the effective usage of the lower and upper bounds on the optimal value of the Lagrangean subproblem. On the basis of extensive computational tests, we can say that they increase the efficiency considerably and result in accurate Lagrangean heuristics. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201181a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 790–809
Titre : Modelling ‘contracts’ between a terrorist group and a government in a sequential game Type de document : texte imprimé Auteurs : F. He, Auteur ; J. Zhuang, Auteur Année de publication : 2012 Article en page(s) : pp. 790–809 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Contracts Game theory Homeland security Preferences for rent Sequential game Target valuations Index. décimale : 001.424 Résumé : In this paper, we apply a sequential game to study the possibility of ‘contracts’ (or at least mutually beneficial arrangements) between a government and a terrorist group. We find equilibrium solutions for complete and incomplete information models, where the government defends and/or provides positive rent, and the terrorist group attacks. We also study the sensitivities of equilibria as a function of both players’ target valuations and preferences for rent. The contract option, if successful, may achieve (partial) attack deterrence, and significantly increase the payoffs not only for the government, but also for some types of terrorist groups. Our work thus provides some novel insights in combating terrorism. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201149a.html [article] Modelling ‘contracts’ between a terrorist group and a government in a sequential game [texte imprimé] / F. He, Auteur ; J. Zhuang, Auteur . - 2012 . - pp. 790–809.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 790–809
Mots-clés : Contracts Game theory Homeland security Preferences for rent Sequential game Target valuations Index. décimale : 001.424 Résumé : In this paper, we apply a sequential game to study the possibility of ‘contracts’ (or at least mutually beneficial arrangements) between a government and a terrorist group. We find equilibrium solutions for complete and incomplete information models, where the government defends and/or provides positive rent, and the terrorist group attacks. We also study the sensitivities of equilibria as a function of both players’ target valuations and preferences for rent. The contract option, if successful, may achieve (partial) attack deterrence, and significantly increase the payoffs not only for the government, but also for some types of terrorist groups. Our work thus provides some novel insights in combating terrorism. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201149a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 810–820
Titre : Dynamic overbooking scheduling system to improve patient access Type de document : texte imprimé Auteurs : Y. Huang, Auteur ; P. Zuniga, Auteur Année de publication : 2012 Article en page(s) : pp. 810–820 Note générale : Operationa research 810–820 Langues : Anglais (eng) Mots-clés : Health services Overbooking No-shows Outpatient scheduling Index. décimale : 001.424 Résumé : Patient no-show has long been a recognized problem in modern outpatient health-care delivery systems. The common impacts are reduced clinic efficiency and provider productivity, wasted medical resources, increased health-care cost and limited patient access to care. The main goal of this research is to develop an effective dynamic overbooking policy into any scheduling system that accounts for the predictive probability of no-shows for any given patient. This policy increases the quality of patient care in terms of wait time and access to care while minimizing the clinic's costs. This proposed model is also illustrated to be more cost-effective than overbooking patients evenly throughout a clinic session. This paper also suggests that overbooking should be performed at better patient flow and higher no-show rate so that the costs are minimized. Consequently, this research improves the outpatient experience for both patients and medical providers. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201183a.html [article] Dynamic overbooking scheduling system to improve patient access [texte imprimé] / Y. Huang, Auteur ; P. Zuniga, Auteur . - 2012 . - pp. 810–820.
Operationa research 810–820
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 810–820
Mots-clés : Health services Overbooking No-shows Outpatient scheduling Index. décimale : 001.424 Résumé : Patient no-show has long been a recognized problem in modern outpatient health-care delivery systems. The common impacts are reduced clinic efficiency and provider productivity, wasted medical resources, increased health-care cost and limited patient access to care. The main goal of this research is to develop an effective dynamic overbooking policy into any scheduling system that accounts for the predictive probability of no-shows for any given patient. This policy increases the quality of patient care in terms of wait time and access to care while minimizing the clinic's costs. This proposed model is also illustrated to be more cost-effective than overbooking patients evenly throughout a clinic session. This paper also suggests that overbooking should be performed at better patient flow and higher no-show rate so that the costs are minimized. Consequently, this research improves the outpatient experience for both patients and medical providers. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201183a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 821–825
Titre : A note on parallel-machine due-window assignment Type de document : texte imprimé Auteurs : A.P.P.A: Association pour la Prévention de la Pollution Atmosphériques, Auteur ; C.-L. Li, Auteur ; Q. Han, Auteur Année de publication : 2012 Article en page(s) : pp. 821–825 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Scheduling Parallel machines Earliness-tardiness Due window Assignment problem Index. décimale : 001.424 Résumé : We consider a due-window assignment problem on identical parallel machines, where the jobs have equal processing times and job-dependent earliness-tardiness costs. We would like to determine a ‘due window’ during which the jobs can be completed at no cost and to obtain a job schedule in which the jobs are penalized if they finish before or after the due window. The objective is to minimize the total earliness and tardiness job penalty, plus the cost associated with the size of the due window. We present an algorithm that can solve this problem in O(n3) time, which is an improvement of the O(n4) solution procedure developed by Mosheiov and Sarig. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201175a.html [article] A note on parallel-machine due-window assignment [texte imprimé] / A.P.P.A: Association pour la Prévention de la Pollution Atmosphériques, Auteur ; C.-L. Li, Auteur ; Q. Han, Auteur . - 2012 . - pp. 821–825.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 821–825
Mots-clés : Scheduling Parallel machines Earliness-tardiness Due window Assignment problem Index. décimale : 001.424 Résumé : We consider a due-window assignment problem on identical parallel machines, where the jobs have equal processing times and job-dependent earliness-tardiness costs. We would like to determine a ‘due window’ during which the jobs can be completed at no cost and to obtain a job schedule in which the jobs are penalized if they finish before or after the due window. The objective is to minimize the total earliness and tardiness job penalty, plus the cost associated with the size of the due window. We present an algorithm that can solve this problem in O(n3) time, which is an improvement of the O(n4) solution procedure developed by Mosheiov and Sarig. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201175a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 826–838
Titre : SOM-based recommendations with privacy on multi-party vertically distributed data Type de document : texte imprimé Auteurs : C. Kaleli, Auteur ; H. Polat, Auteur Année de publication : 2012 Article en page(s) : pp. 826–838 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Privacy Vertically distributed data Prediction SOM Index. décimale : 001.424 Résumé : Data collected for providing recommendations can be partitioned among different parties. Offering distributed data-based predictions is popular due to mutual advantages. It is almost impossible to present trustworthy referrals with decent accuracy from split data only. Meaningful outcomes can be drawn from adequate data. Those companies with distributed data might want to collaborate to produce accurate and dependable recommendations to their customers. However, they hesitate to work together or refuse to collaborate because of privacy, financial concerns, and legal issues. If privacy-preserving measures are provided, such data holders might decide to collaborate for better predictions. In this study, we investigate how to provide predictions based on vertically distributed data (VDD) among multiple parties without deeply jeopardizing their confidentiality. Users are first grouped into various clusters off-line using self-organizing map clustering while protecting the online vendors’ privacy. With privacy concerns, recommendations are produced based on partitioned data using a nearest neighbour prediction algorithm. We analyse our privacy-preserving scheme in terms of confidentiality and supplementary costs. Our analysis shows that our method offers recommendations without greatly exposing data holders’ privacy and causes negligible superfluous costs because of privacy concerns. To evaluate the scheme in terms of accuracy, we perform real-data-based experiments. Our experiment results demonstrate that the scheme is still able to provide truthful predictions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201176a.html [article] SOM-based recommendations with privacy on multi-party vertically distributed data [texte imprimé] / C. Kaleli, Auteur ; H. Polat, Auteur . - 2012 . - pp. 826–838.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 826–838
Mots-clés : Privacy Vertically distributed data Prediction SOM Index. décimale : 001.424 Résumé : Data collected for providing recommendations can be partitioned among different parties. Offering distributed data-based predictions is popular due to mutual advantages. It is almost impossible to present trustworthy referrals with decent accuracy from split data only. Meaningful outcomes can be drawn from adequate data. Those companies with distributed data might want to collaborate to produce accurate and dependable recommendations to their customers. However, they hesitate to work together or refuse to collaborate because of privacy, financial concerns, and legal issues. If privacy-preserving measures are provided, such data holders might decide to collaborate for better predictions. In this study, we investigate how to provide predictions based on vertically distributed data (VDD) among multiple parties without deeply jeopardizing their confidentiality. Users are first grouped into various clusters off-line using self-organizing map clustering while protecting the online vendors’ privacy. With privacy concerns, recommendations are produced based on partitioned data using a nearest neighbour prediction algorithm. We analyse our privacy-preserving scheme in terms of confidentiality and supplementary costs. Our analysis shows that our method offers recommendations without greatly exposing data holders’ privacy and causes negligible superfluous costs because of privacy concerns. To evaluate the scheme in terms of accuracy, we perform real-data-based experiments. Our experiment results demonstrate that the scheme is still able to provide truthful predictions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201176a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 839–845
Titre : Two-stage assembly-type flowshop batch scheduling problem subject to a fixed job sequence Type de document : texte imprimé Auteurs : F. J. Hwang, Auteur ; B. M. T. Lin, Auteur Année de publication : 2012 Article en page(s) : pp. 839–845 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Assembly flowshop Batch scheduling Fixed sequence Dynamic programming Index. décimale : 001.424 Résumé : This paper discusses a two-stage assembly-type flowshop scheduling problem with batching considerations subject to a fixed job sequence. The two-stage assembly flowshop consists of m stage-1 parallel dedicated machines and a stage-2 assembly machine which processes the jobs in batches. Four regular performance metrics, namely, the total completion time, maximum lateness, total tardiness, and number of tardy jobs, are considered. The goal is to obtain an optimal batching decision for the predetermined job sequence at stage 2. This study presents a two-phase algorithm, which is developed by coupling a problem-transformation procedure with a dynamic program. The running time of the proposed algorithm is O(mn+n5), where n is the number of jobs. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201190a.html [article] Two-stage assembly-type flowshop batch scheduling problem subject to a fixed job sequence [texte imprimé] / F. J. Hwang, Auteur ; B. M. T. Lin, Auteur . - 2012 . - pp. 839–845.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 839–845
Mots-clés : Assembly flowshop Batch scheduling Fixed sequence Dynamic programming Index. décimale : 001.424 Résumé : This paper discusses a two-stage assembly-type flowshop scheduling problem with batching considerations subject to a fixed job sequence. The two-stage assembly flowshop consists of m stage-1 parallel dedicated machines and a stage-2 assembly machine which processes the jobs in batches. Four regular performance metrics, namely, the total completion time, maximum lateness, total tardiness, and number of tardy jobs, are considered. The goal is to obtain an optimal batching decision for the predetermined job sequence at stage 2. This study presents a two-phase algorithm, which is developed by coupling a problem-transformation procedure with a dynamic program. The running time of the proposed algorithm is O(mn+n5), where n is the number of jobs. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201190a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 846–859
Titre : An imperfect repair strategy for two-dimensional warranty Type de document : texte imprimé Auteurs : S. Varnosafaderani, Auteur ; S. Chukova, Auteur Année de publication : 2012 Article en page(s) : pp. 846–859 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Imperfect repair Virtual age Two-dimensional warranty Index. décimale : 001.424 Résumé : The objective of this study is to develop a warranty servicing strategy, based on imperfect and minimal repairs, that minimises the total warranty servicing cost. For pre-specified degrees of repair, the expected warranty servicing cost is minimised by optimally partitioning a two-dimensional rectangular warranty region into n disjoint subregions. We numerically illustrate the imperfect repair strategy and provide a comparison with previously studied warranty repair strategies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201166a.html [article] An imperfect repair strategy for two-dimensional warranty [texte imprimé] / S. Varnosafaderani, Auteur ; S. Chukova, Auteur . - 2012 . - pp. 846–859.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 846–859
Mots-clés : Imperfect repair Virtual age Two-dimensional warranty Index. décimale : 001.424 Résumé : The objective of this study is to develop a warranty servicing strategy, based on imperfect and minimal repairs, that minimises the total warranty servicing cost. For pre-specified degrees of repair, the expected warranty servicing cost is minimised by optimally partitioning a two-dimensional rectangular warranty region into n disjoint subregions. We numerically illustrate the imperfect repair strategy and provide a comparison with previously studied warranty repair strategies. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201166a.html
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 860–861
Titre : Abduction: the missing link between deduction and induction. A comment on Ormerod's ‘rational inference : deductive, inductive and probabilistic thinking’ Type de document : texte imprimé Auteurs : J. Mingers, Auteur Année de publication : 2012 Article en page(s) : pp. 860–861 Note générale : Operational research Langues : Anglais (eng) Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201185a.html [article] Abduction: the missing link between deduction and induction. A comment on Ormerod's ‘rational inference : deductive, inductive and probabilistic thinking’ [texte imprimé] / J. Mingers, Auteur . - 2012 . - pp. 860–861.
Operational research
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 63 N° 6 (Juin 2012) . - pp. 860–861
Index. décimale : 001.424 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n6/abs/jors201185a.html
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