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Journal of the operational research society (JORS) |
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Ajouter le résultat dans votre panierSafety cameras and road accidents: effectiveness in local authority areas in England / Hindle, G. A. in Journal of the operational research society (JORS), Vol. 62 N° 7 (Juillet 2011)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1181–1188
Titre : Safety cameras and road accidents: effectiveness in local authority areas in England Type de document : texte imprimé Auteurs : Hindle, G. A., Auteur ; Hindle, T., Auteur Année de publication : 2011 Article en page(s) : pp. 1181–1188 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Public expenditure Government Regional studies Transport Regression Index. décimale : 001.424 Résumé : Safety cameras have been central to strategy for improving road safety in the UK (and other countries) over the past decade and a National Safety Camera (NSC) programme was introduced in the year 2000 to fund and guide the expansion of camera sites. This programme was brought to an end in 2007 and responsibility for decisions on expanding, maintaining or rolling back safety cameras has now been largely devolved to local highway authorities and their partners. To make strategic choices in such areas it is clearly vital to understand the extent to which safety cameras are effective in reducing road accident potential. Although the NSC programme has been evaluated this work has focussed mainly on assessments of impacts at camera sites rather than wider area effects: particularly local highway area effects. The research reported here has explored the rates of personal injury collisions (PIC) over the past decade on the roads of English Local Authority areas and investigated relationships between area characteristics including levels of safety camera introductions and the PIC improvements (or otherwise) reported. To assist in this analysis, an indicator of safety camera intensity has been derived in this research to reflect the relative likelihood in areas of coming into contact with safety camera sites This work shows that area improvement rates differ significantly on an urban/rural dimension and are also very dependent on prior (to camera introductions) levels of PIC risk. Controlling for these factors using a pair comparison approach, analysis shows that safety camera introduction effects are statistically detectable in very highly urbanised, high PIC risk areas and at high risk sites within areas but not elsewhere. Whilst recognising that new high risk sites can emerge in any area, the conclusion is reached that many local areas and especially more rural areas would be unlikely to gain advantage from a further general expansion of fixed point and mobile camera sites and that de-commissioning of current sites should be seriously considered. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201043a.html [article] Safety cameras and road accidents: effectiveness in local authority areas in England [texte imprimé] / Hindle, G. A., Auteur ; Hindle, T., Auteur . - 2011 . - pp. 1181–1188.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1181–1188
Mots-clés : Public expenditure Government Regional studies Transport Regression Index. décimale : 001.424 Résumé : Safety cameras have been central to strategy for improving road safety in the UK (and other countries) over the past decade and a National Safety Camera (NSC) programme was introduced in the year 2000 to fund and guide the expansion of camera sites. This programme was brought to an end in 2007 and responsibility for decisions on expanding, maintaining or rolling back safety cameras has now been largely devolved to local highway authorities and their partners. To make strategic choices in such areas it is clearly vital to understand the extent to which safety cameras are effective in reducing road accident potential. Although the NSC programme has been evaluated this work has focussed mainly on assessments of impacts at camera sites rather than wider area effects: particularly local highway area effects. The research reported here has explored the rates of personal injury collisions (PIC) over the past decade on the roads of English Local Authority areas and investigated relationships between area characteristics including levels of safety camera introductions and the PIC improvements (or otherwise) reported. To assist in this analysis, an indicator of safety camera intensity has been derived in this research to reflect the relative likelihood in areas of coming into contact with safety camera sites This work shows that area improvement rates differ significantly on an urban/rural dimension and are also very dependent on prior (to camera introductions) levels of PIC risk. Controlling for these factors using a pair comparison approach, analysis shows that safety camera introduction effects are statistically detectable in very highly urbanised, high PIC risk areas and at high risk sites within areas but not elsewhere. Whilst recognising that new high risk sites can emerge in any area, the conclusion is reached that many local areas and especially more rural areas would be unlikely to gain advantage from a further general expansion of fixed point and mobile camera sites and that de-commissioning of current sites should be seriously considered. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201043a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1189–1197
Titre : Berth and quay crane allocation: a moldable task scheduling model Type de document : texte imprimé Auteurs : Blazewicz, J., Auteur ; Cheng, T. C. E., Auteur ; Machowiak, M., Auteur Année de publication : 2011 Article en page(s) : pp. 1189–1197 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Berth allocation Guay crane allocation Moldable task Resource allocation Parallel computing Index. décimale : 001.424 Résumé : We study the problem of allocating berths to incoming ships and assigning the necessary quay cranes to the ships at a port container terminal. We formulate the problem as the moldable task scheduling problem by considering the tasks as ships and processors as quay cranes assigned to the ships based on the observation that the berthing duration of a ship depends on the number of quay cranes allocated to it. In the model, the processing speed of a task is considered to be a non-linear function of the number of processors allocated to it. We present a suboptimal algorithm that obtains a feasible solution to the discrete version of the problem from the continuous version, that is, where the tasks may require fractional quantities of the resources. We conducted computational experiments to evaluate the performance of the algorithm. The computational results show that the average behaviour of the algorithm is very good. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201054a.html [article] Berth and quay crane allocation: a moldable task scheduling model [texte imprimé] / Blazewicz, J., Auteur ; Cheng, T. C. E., Auteur ; Machowiak, M., Auteur . - 2011 . - pp. 1189–1197.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1189–1197
Mots-clés : Berth allocation Guay crane allocation Moldable task Resource allocation Parallel computing Index. décimale : 001.424 Résumé : We study the problem of allocating berths to incoming ships and assigning the necessary quay cranes to the ships at a port container terminal. We formulate the problem as the moldable task scheduling problem by considering the tasks as ships and processors as quay cranes assigned to the ships based on the observation that the berthing duration of a ship depends on the number of quay cranes allocated to it. In the model, the processing speed of a task is considered to be a non-linear function of the number of processors allocated to it. We present a suboptimal algorithm that obtains a feasible solution to the discrete version of the problem from the continuous version, that is, where the tasks may require fractional quantities of the resources. We conducted computational experiments to evaluate the performance of the algorithm. The computational results show that the average behaviour of the algorithm is very good. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201054a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1198–1210
Titre : Delimitation of service areas in reverse logistics networks with multiple depots Type de document : texte imprimé Auteurs : Ramos, T. R. P., Auteur ; Oliveira, R. C., Auteur Année de publication : 2011 Article en page(s) : pp. 1198–1210 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Multiple depots Service areas Heuristics Reverse logistics Vehicle routing Index. décimale : 001.424 Résumé : This paper describes a heuristic approach for the definition of service (or influence) areas of multiple depots in a reverse logistics network. This work is based on a case study: the recyclable waste collection system with 5 depots that covers seven municipalities in the Alentejo region, southern Portugal. The system optimization considers two objectives, related with economic and organizational issues: minimizing the variable costs (function of the travelled distances by the collection vehicles), and the pursuit of equity, aiming at minimizing the workload differences among depots. The goal of balancing workloads poses a problem not usually treated in the existing literature. This fact required the development of a new approach with innovative elements adjusted to the existing circumstances. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201083a.html [article] Delimitation of service areas in reverse logistics networks with multiple depots [texte imprimé] / Ramos, T. R. P., Auteur ; Oliveira, R. C., Auteur . - 2011 . - pp. 1198–1210.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1198–1210
Mots-clés : Multiple depots Service areas Heuristics Reverse logistics Vehicle routing Index. décimale : 001.424 Résumé : This paper describes a heuristic approach for the definition of service (or influence) areas of multiple depots in a reverse logistics network. This work is based on a case study: the recyclable waste collection system with 5 depots that covers seven municipalities in the Alentejo region, southern Portugal. The system optimization considers two objectives, related with economic and organizational issues: minimizing the variable costs (function of the travelled distances by the collection vehicles), and the pursuit of equity, aiming at minimizing the workload differences among depots. The goal of balancing workloads poses a problem not usually treated in the existing literature. This fact required the development of a new approach with innovative elements adjusted to the existing circumstances. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201083a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1211–1226
Titre : Modelling of containerized air cargo forwarding problems under uncertainty Type de document : texte imprimé Auteurs : Wu, Y., Auteur Année de publication : 2011 Article en page(s) : pp. 1211–1226 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Air container Cargo forwarding Containerization Globalization Robust optimization Stochastic programming Index. décimale : 001.424 Résumé : This paper examines air container renting and cargo loading problems experienced by freight forwarding companies. Containers have to be booked in advance, in order to obtain discounted rental rates from airlines; renting or returning containers on the day of shipping will incur a heavy penalty. We first propose a mixed-integer model for the certain problem, in which shipment information is known with certainty, when booking. We then present a two-stage recourse model to handle the uncertainty problem, in which accurate shipment information cannot be obtained when booking, and all cargoes have to be shipped without delay. The first-stage decision is made at the booking stage, to book specific numbers of different types of containers. The second-stage decision is made on the day of shipping, depending on the extent to which the uncertainty has been realized. The decisions include number of additional containers of different types that are required to be rented, or the number of containers to be returned, under the scenario that might occur on the day of shipping. We then extend the recourse model into a robust model for dealing with the situation in which cargoes are allowed to be shipped later. The robust model provides a quantitative method to measure the trade-off between risk and cost. A series of experiments demonstrate the effectiveness of the robust model in dealing with risk and uncertainty. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201084a.html [article] Modelling of containerized air cargo forwarding problems under uncertainty [texte imprimé] / Wu, Y., Auteur . - 2011 . - pp. 1211–1226.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1211–1226
Mots-clés : Air container Cargo forwarding Containerization Globalization Robust optimization Stochastic programming Index. décimale : 001.424 Résumé : This paper examines air container renting and cargo loading problems experienced by freight forwarding companies. Containers have to be booked in advance, in order to obtain discounted rental rates from airlines; renting or returning containers on the day of shipping will incur a heavy penalty. We first propose a mixed-integer model for the certain problem, in which shipment information is known with certainty, when booking. We then present a two-stage recourse model to handle the uncertainty problem, in which accurate shipment information cannot be obtained when booking, and all cargoes have to be shipped without delay. The first-stage decision is made at the booking stage, to book specific numbers of different types of containers. The second-stage decision is made on the day of shipping, depending on the extent to which the uncertainty has been realized. The decisions include number of additional containers of different types that are required to be rented, or the number of containers to be returned, under the scenario that might occur on the day of shipping. We then extend the recourse model into a robust model for dealing with the situation in which cargoes are allowed to be shipped later. The robust model provides a quantitative method to measure the trade-off between risk and cost. A series of experiments demonstrate the effectiveness of the robust model in dealing with risk and uncertainty. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201084a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1227–1238
Titre : Use of VNS heuristics for scheduling of patients in hospital Type de document : texte imprimé Auteurs : Vlah, S., Auteur ; Lukac, Z., Auteur ; Pacheco, J., Auteur Année de publication : 2011 Article en page(s) : pp. 1227–1238 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Health service Scheduling Hospitals Heuristics Reduced VNS Index. décimale : 001.424 Résumé : One of the important problems in hospital management is how to schedule the treatments of resident patients in hospital for a given day due to the restrictions imposed by their medical condition as well as restrictions on medical machines and qualified medical personnel availability. Patients are to be subjected to different kinds of treatments, each requiring a medical machine of a certain type as well as a physician being qualified to operate it. This is a highly complex problem not yet adequately addressed in the literature. At present in most hospitals the problem is being solved manually by specialized personnel. However, the resulting schedules are very often inaccurate and inefficient with patients waiting for a long time to be treated and medical personnel often working overtime. In this paper we formulate the model for this problem and develop a simple and efficient method based on Variable Neighbourhood Search for solving it. The heuristics has been tested on real-life as well as on generated instances. Numerical results show that the heuristics proposed outperform commercial software for optimization as well as manual solutions both in quality of solution and in computational time. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201073a.html [article] Use of VNS heuristics for scheduling of patients in hospital [texte imprimé] / Vlah, S., Auteur ; Lukac, Z., Auteur ; Pacheco, J., Auteur . - 2011 . - pp. 1227–1238.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1227–1238
Mots-clés : Health service Scheduling Hospitals Heuristics Reduced VNS Index. décimale : 001.424 Résumé : One of the important problems in hospital management is how to schedule the treatments of resident patients in hospital for a given day due to the restrictions imposed by their medical condition as well as restrictions on medical machines and qualified medical personnel availability. Patients are to be subjected to different kinds of treatments, each requiring a medical machine of a certain type as well as a physician being qualified to operate it. This is a highly complex problem not yet adequately addressed in the literature. At present in most hospitals the problem is being solved manually by specialized personnel. However, the resulting schedules are very often inaccurate and inefficient with patients waiting for a long time to be treated and medical personnel often working overtime. In this paper we formulate the model for this problem and develop a simple and efficient method based on Variable Neighbourhood Search for solving it. The heuristics has been tested on real-life as well as on generated instances. Numerical results show that the heuristics proposed outperform commercial software for optimization as well as manual solutions both in quality of solution and in computational time. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201073a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1239–1252
Titre : Locating disaster response facilities in Istanbul Type de document : texte imprimé Auteurs : Görmez, N., Auteur ; Köksalan, M., Auteur ; Salman, F. S., Auteur Année de publication : 2011 Article en page(s) : pp. 1239–1252 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Disaster preparedness and response Facility location Humanitarian logistics Index. décimale : 001.424 Résumé : We study the problem of locating disaster response and relief facilities in the city of Istanbul, where a massively destructive earthquake is expected to occur in the near future. The Metropolitan Municipality of Istanbul decided to establish facilities to preposition relief aid and execute post-disaster response operations. We propose a two-tier distribution system that utilizes existing public facilities locally in addition to the new facilities that will act as regional supply points. We develop mathematical models to decide on the locations of the new facilities with the objectives of minimizing the average-weighted distance between casualty locations and closest facilities, and opening a small number of facilities, subject to distance limits and backup requirements under regional vulnerability considerations. We analyze the trade-offs between these two objectives under various disaster scenarios and investigate the solutions for several modelling extensions. The results demonstrate that a small number of facilities will be sufficient and their locations are robust to various parameter and modelling changes. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201067a.html [article] Locating disaster response facilities in Istanbul [texte imprimé] / Görmez, N., Auteur ; Köksalan, M., Auteur ; Salman, F. S., Auteur . - 2011 . - pp. 1239–1252.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1239–1252
Mots-clés : Disaster preparedness and response Facility location Humanitarian logistics Index. décimale : 001.424 Résumé : We study the problem of locating disaster response and relief facilities in the city of Istanbul, where a massively destructive earthquake is expected to occur in the near future. The Metropolitan Municipality of Istanbul decided to establish facilities to preposition relief aid and execute post-disaster response operations. We propose a two-tier distribution system that utilizes existing public facilities locally in addition to the new facilities that will act as regional supply points. We develop mathematical models to decide on the locations of the new facilities with the objectives of minimizing the average-weighted distance between casualty locations and closest facilities, and opening a small number of facilities, subject to distance limits and backup requirements under regional vulnerability considerations. We analyze the trade-offs between these two objectives under various disaster scenarios and investigate the solutions for several modelling extensions. The results demonstrate that a small number of facilities will be sufficient and their locations are robust to various parameter and modelling changes. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201067a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1253–1267
Titre : Consumer choice behaviour and new product development : an integrated market simulation approach Type de document : texte imprimé Auteurs : Tsafarakis, S., Auteur ; Grigoroudis, E., Auteur ; Matsatsinis, N., Auteur Année de publication : 2011 Article en page(s) : pp. 1253–1267 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Consumer choice Product design Simulation behaviour Marketing Forecasting Index. décimale : 001.424 Résumé : The extremely high costs associated with the commercial failure of a new product, stresses the importance of a model that will effectively forecast the market penetration of a product at the design stage. The purpose of our study is to discover heuristics that will better explain market share, an issue of considerable concern to industry, which also, if successfully pursued, will increase the value of the analytical tools developed for managers. A method easy to implement is presented, which improves the value of market simulations in conjoint analysis. The proposed approach deals with two issues common to traditional market simulations in the context of conjoint analysis applications—the lack of differential impact of attributes across alternatives and the absence of accounting for differential substitution across brands (ie, the Independence from Irrelevant Alternatives problem). We deal with the first issue by ‘tuning’ utilities with individual level exponents, as opposed to a common exponent under the ‘ALPHA’ rule (the current state of the art approach). These exponents derive from the range, skewness and kurtosis of the distribution of utilities that a respondent assigns to various products. While these exponents are individual specific, the effects of the coefficients are assumed to be homogeneous across consumers to preserve model parsimony, while accounting for observed heterogeneity in the data. The second issue is studied in the model via a similarity ‘correction’ for each pair of products. The performance of the approach is validated both on real data from a market survey concerning milk, and on simulated data through the design of a Monte Carlo experiment. The results of the simulation for different market scenarios indicate that the approach appropriately exhibits the theoretical properties that are necessary for the efficient representation of consumer choice behaviour. In addition, the proposed model outperforms the state of the art methodology, as well as some more traditional approaches, with regard to the forecasting accuracy on market shares estimation, both on the real and the simulated data sets. The results obtained have important implications for marketing managers concerning the design of new products. A new concept can be tested before it enters the production stage, using data obtained from a market survey. The high predictive accuracy of the model may assist a firm in minimizing the uncertainty and risks associated with a new product launch. The case study with data from a real market survey, illustrates the practical applicability of the approach. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201070a.html [article] Consumer choice behaviour and new product development : an integrated market simulation approach [texte imprimé] / Tsafarakis, S., Auteur ; Grigoroudis, E., Auteur ; Matsatsinis, N., Auteur . - 2011 . - pp. 1253–1267.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1253–1267
Mots-clés : Consumer choice Product design Simulation behaviour Marketing Forecasting Index. décimale : 001.424 Résumé : The extremely high costs associated with the commercial failure of a new product, stresses the importance of a model that will effectively forecast the market penetration of a product at the design stage. The purpose of our study is to discover heuristics that will better explain market share, an issue of considerable concern to industry, which also, if successfully pursued, will increase the value of the analytical tools developed for managers. A method easy to implement is presented, which improves the value of market simulations in conjoint analysis. The proposed approach deals with two issues common to traditional market simulations in the context of conjoint analysis applications—the lack of differential impact of attributes across alternatives and the absence of accounting for differential substitution across brands (ie, the Independence from Irrelevant Alternatives problem). We deal with the first issue by ‘tuning’ utilities with individual level exponents, as opposed to a common exponent under the ‘ALPHA’ rule (the current state of the art approach). These exponents derive from the range, skewness and kurtosis of the distribution of utilities that a respondent assigns to various products. While these exponents are individual specific, the effects of the coefficients are assumed to be homogeneous across consumers to preserve model parsimony, while accounting for observed heterogeneity in the data. The second issue is studied in the model via a similarity ‘correction’ for each pair of products. The performance of the approach is validated both on real data from a market survey concerning milk, and on simulated data through the design of a Monte Carlo experiment. The results of the simulation for different market scenarios indicate that the approach appropriately exhibits the theoretical properties that are necessary for the efficient representation of consumer choice behaviour. In addition, the proposed model outperforms the state of the art methodology, as well as some more traditional approaches, with regard to the forecasting accuracy on market shares estimation, both on the real and the simulated data sets. The results obtained have important implications for marketing managers concerning the design of new products. A new concept can be tested before it enters the production stage, using data obtained from a market survey. The high predictive accuracy of the model may assist a firm in minimizing the uncertainty and risks associated with a new product launch. The case study with data from a real market survey, illustrates the practical applicability of the approach. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201070a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1268–1281
Titre : Efficiency analysis of chain stores: a case study Type de document : texte imprimé Auteurs : Lin, H.-T., Auteur Année de publication : 2011 Article en page(s) : pp. 1268–1281 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Assurance region Efficiency decomposition Index. décimale : 001.424 Résumé : An efficiency analysis problem of a hairdressing company is addressed in this paper. The service system has the characteristics of different trade area types, multiple workers with different levels, crisp facilities and expenses and customer relationship orientations. A specialized imprecise data envelopment analysis (IDEA) model is proposed so that the efficiencies of stores from different trade areas can be compared and all workers in different ranks are included. The analysis results exhibit that the inefficiency in resource utilization is largely caused by inefficient operation. Based on the measurement results, eight stores and two stores are aimed with high priority for improving the efficiencies in operation and scale, respectively. The regional manager agrees that IDEA is helpful in evaluating relative efficiency and detecting the reasons caused inefficiency. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201097a.html [article] Efficiency analysis of chain stores: a case study [texte imprimé] / Lin, H.-T., Auteur . - 2011 . - pp. 1268–1281.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1268–1281
Mots-clés : Data envelopment analysis Assurance region Efficiency decomposition Index. décimale : 001.424 Résumé : An efficiency analysis problem of a hairdressing company is addressed in this paper. The service system has the characteristics of different trade area types, multiple workers with different levels, crisp facilities and expenses and customer relationship orientations. A specialized imprecise data envelopment analysis (IDEA) model is proposed so that the efficiencies of stores from different trade areas can be compared and all workers in different ranks are included. The analysis results exhibit that the inefficiency in resource utilization is largely caused by inefficient operation. Based on the measurement results, eight stores and two stores are aimed with high priority for improving the efficiencies in operation and scale, respectively. The regional manager agrees that IDEA is helpful in evaluating relative efficiency and detecting the reasons caused inefficiency. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201097a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1282–1297
Titre : Costs and efficiency of higher education institutions in England : a DEA analysis Type de document : texte imprimé Auteurs : Thanassoulis, E., Auteur ; Kortelainen, M., Auteur ; Johnes, G., Auteur Année de publication : 2011 Article en page(s) : pp. 1282–1297 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Higher education Data envelopment analysis Performance measurement Productivity Cost function Index. décimale : 001.424 Résumé : As student numbers in higher education in the UK have expanded during recent years, it has become increasingly important to understand its cost structure. This study applies Data Envelopment Analysis (DEA) to higher education institutions in England to assess their cost structure, efficiency and productivity. The paper complements an earlier study that used parametric methods to analyse the same panel data. Interestingly, DEA provides estimates of subject-specific unit costs that are in the same ballpark as those provided by the parametric methods. The paper then extends the previous analysis and finds that further student number increases of the order of 20–27% are feasible through exploiting operating and scale efficiency gains and also adjusting student mix. Finally the paper uses a Malmquist index approach to assess productivity change in the UK higher education. The results reveal that for a majority of institutions productivity has actually decreased during the study period. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201068a.html [article] Costs and efficiency of higher education institutions in England : a DEA analysis [texte imprimé] / Thanassoulis, E., Auteur ; Kortelainen, M., Auteur ; Johnes, G., Auteur . - 2011 . - pp. 1282–1297.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1282–1297
Mots-clés : Higher education Data envelopment analysis Performance measurement Productivity Cost function Index. décimale : 001.424 Résumé : As student numbers in higher education in the UK have expanded during recent years, it has become increasingly important to understand its cost structure. This study applies Data Envelopment Analysis (DEA) to higher education institutions in England to assess their cost structure, efficiency and productivity. The paper complements an earlier study that used parametric methods to analyse the same panel data. Interestingly, DEA provides estimates of subject-specific unit costs that are in the same ballpark as those provided by the parametric methods. The paper then extends the previous analysis and finds that further student number increases of the order of 20–27% are feasible through exploiting operating and scale efficiency gains and also adjusting student mix. Finally the paper uses a Malmquist index approach to assess productivity change in the UK higher education. The results reveal that for a majority of institutions productivity has actually decreased during the study period. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201068a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1298–1319
Titre : Formative evaluation of electricity distribution utilities using data envelopment analysis Type de document : texte imprimé Auteurs : Santos, S. P., Auteur ; Amado, C. A. F., Auteur ; Rosado, J. R., Auteur Année de publication : 2011 Article en page(s) : pp. 1298–1319 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Electricity distribution Performance measurement Index. décimale : 001.424 Résumé : The use of Data Envelopment Analysis (DEA) in the electricity distribution sector has been prolific in the number of papers published in research journals. However, while numerous studies have been documented, they have mostly been summative. Their aim has been predominantly descriptive and classificatory. This paper argues that evaluations of a formative nature are more effective than summative studies in promoting a better understanding of the structures and processes of electricity distribution utilities and, consequently, are more appropriate to contribute to performance improvement. To illustrate the use of DEA for formative evaluation, and highlight some of the difficulties of using DEA in practice, this paper compares the cost-efficiency of the Portuguese electricity distribution companies from 2002 to 2006. A dynamic analysis using Malmquist Indices is also conducted in order to evaluate the changes in productivity over this period. Our analysis shows that the application of DEA for formative purposes meets some difficulties. In particular it shows that while the modelling of productivity/efficiency scores using DEA is relatively straightforward, it is comparatively more difficult to develop models that are economically valid and that produce results with face validity. On the basis of the insights derived from this analysis, the paper provides some recommendations regarding the successful application of DEA for performance improvement. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201066a.html [article] Formative evaluation of electricity distribution utilities using data envelopment analysis [texte imprimé] / Santos, S. P., Auteur ; Amado, C. A. F., Auteur ; Rosado, J. R., Auteur . - 2011 . - pp. 1298–1319.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1298–1319
Mots-clés : Data envelopment analysis Electricity distribution Performance measurement Index. décimale : 001.424 Résumé : The use of Data Envelopment Analysis (DEA) in the electricity distribution sector has been prolific in the number of papers published in research journals. However, while numerous studies have been documented, they have mostly been summative. Their aim has been predominantly descriptive and classificatory. This paper argues that evaluations of a formative nature are more effective than summative studies in promoting a better understanding of the structures and processes of electricity distribution utilities and, consequently, are more appropriate to contribute to performance improvement. To illustrate the use of DEA for formative evaluation, and highlight some of the difficulties of using DEA in practice, this paper compares the cost-efficiency of the Portuguese electricity distribution companies from 2002 to 2006. A dynamic analysis using Malmquist Indices is also conducted in order to evaluate the changes in productivity over this period. Our analysis shows that the application of DEA for formative purposes meets some difficulties. In particular it shows that while the modelling of productivity/efficiency scores using DEA is relatively straightforward, it is comparatively more difficult to develop models that are economically valid and that produce results with face validity. On the basis of the insights derived from this analysis, the paper provides some recommendations regarding the successful application of DEA for performance improvement. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201066a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1320–1333
Titre : Adding value to bank branch performance evaluation using cognitive maps and MCDA : a case study Type de document : texte imprimé Auteurs : Ferreira, F. A. F., Auteur ; Santos, S. P., Auteur ; Rodrigues, P. M. M., Auteur Année de publication : 2011 Article en page(s) : pp. 1320–1333 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Bank branches Cognitive mapping MCDA Performance evaluation Index. décimale : 001.424 Résumé : Bank branch performance evaluation is a difficult endeavour. Some of the main reasons for this difficulty are the complexity inherent in the variety of aspects considered in the evaluation, and the multiple and conflicting interests of the different stakeholders involved. In this paper, we show how cognitive mapping and measuring attractiveness by a categorical-based evaluation technique can be used to support the evaluation of bank branches through the development of multidimensional performance evaluation systems, and to deal explicitly with the trade-offs between the different dimensions of performance and interests of different stakeholders. A case study is discussed where these techniques are used in a constructive way, making the learning activity easier and introducing transparency in the decision-making process. The strengths and weaknesses of the integrated use of these two operational research techniques in this context are also discussed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010111a.html [article] Adding value to bank branch performance evaluation using cognitive maps and MCDA : a case study [texte imprimé] / Ferreira, F. A. F., Auteur ; Santos, S. P., Auteur ; Rodrigues, P. M. M., Auteur . - 2011 . - pp. 1320–1333.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1320–1333
Mots-clés : Bank branches Cognitive mapping MCDA Performance evaluation Index. décimale : 001.424 Résumé : Bank branch performance evaluation is a difficult endeavour. Some of the main reasons for this difficulty are the complexity inherent in the variety of aspects considered in the evaluation, and the multiple and conflicting interests of the different stakeholders involved. In this paper, we show how cognitive mapping and measuring attractiveness by a categorical-based evaluation technique can be used to support the evaluation of bank branches through the development of multidimensional performance evaluation systems, and to deal explicitly with the trade-offs between the different dimensions of performance and interests of different stakeholders. A case study is discussed where these techniques are used in a constructive way, making the learning activity easier and introducing transparency in the decision-making process. The strengths and weaknesses of the integrated use of these two operational research techniques in this context are also discussed. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010111a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1334–1343
Titre : Production planning with uncertainty in the quality of raw materials : a case in sawmills Type de document : texte imprimé Auteurs : Kazemi Zanjani, M., Auteur ; Nourelfath, M., Auteur ; Ait-Kadi, D., Auteur Année de publication : 2011 Article en page(s) : pp. 1334–1343 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Planning Production Stochastic programming Monte Carlo simulation Sawmill Index. décimale : 001.424 Résumé : Motivated by sawmill production planning, this paper investigates multi-period, multi-product (MPMP) production planning in a manufacturing environment with non-homogeneous raw materials, and consequently random process yields. A two-stage stochastic program with recourse is proposed to address the problem. The random yields are modelled as scenarios with stationary probability distributions during the planning horizon. The solution methodology is based on the sample average approximation (SAA) scheme. The stochastic sawmill production planning model is validated through the Monte Carlo simulation. The computational results for a real medium capacity sawmill highlight the significance of using the stochastic model as a viable tool for production planning instead of the mean-value deterministic model, which is a traditional production planning tool in many sawmills. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201030a.html [article] Production planning with uncertainty in the quality of raw materials : a case in sawmills [texte imprimé] / Kazemi Zanjani, M., Auteur ; Nourelfath, M., Auteur ; Ait-Kadi, D., Auteur . - 2011 . - pp. 1334–1343.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1334–1343
Mots-clés : Planning Production Stochastic programming Monte Carlo simulation Sawmill Index. décimale : 001.424 Résumé : Motivated by sawmill production planning, this paper investigates multi-period, multi-product (MPMP) production planning in a manufacturing environment with non-homogeneous raw materials, and consequently random process yields. A two-stage stochastic program with recourse is proposed to address the problem. The random yields are modelled as scenarios with stationary probability distributions during the planning horizon. The solution methodology is based on the sample average approximation (SAA) scheme. The stochastic sawmill production planning model is validated through the Monte Carlo simulation. The computational results for a real medium capacity sawmill highlight the significance of using the stochastic model as a viable tool for production planning instead of the mean-value deterministic model, which is a traditional production planning tool in many sawmills. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201030a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1344–1356
Titre : Methodological proposal for business sustainability management by means of the Balanced Scorecard Type de document : texte imprimé Auteurs : Chalmeta, R., Auteur ; Palomero, S., Auteur Année de publication : 2011 Article en page(s) : pp. 1344–1356 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Sustainable balanced scorecard (SBSC) Corporate social responsibility (CSR) Sustainability Case study Methodology Index. décimale : 001.424 Résumé : Organisations are becoming increasingly aware of the need to include the concepts of economic, social and environmental sustainability within their different management models. To help them achieve this, they have a number of different CSR management tools available to them. However, despite offering recommendations on how and where to contemplate the concepts of sustainability within organisations, such instruments do not define a set of guidelines or a structured framework for implementing those concepts. Accordingly, the aim of this paper is to enhance one of the tools that is most widely known and used in strategic management, the Balanced Scorecard, so that the concepts of sustainability can be implemented within the strategy and the day-to-day management of the enterprise. To do so, the case methodology was applied to 16 organisations in order to obtain what could be called a Sustainable Balanced Scorecard. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201069a.html [article] Methodological proposal for business sustainability management by means of the Balanced Scorecard [texte imprimé] / Chalmeta, R., Auteur ; Palomero, S., Auteur . - 2011 . - pp. 1344–1356.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1344–1356
Mots-clés : Sustainable balanced scorecard (SBSC) Corporate social responsibility (CSR) Sustainability Case study Methodology Index. décimale : 001.424 Résumé : Organisations are becoming increasingly aware of the need to include the concepts of economic, social and environmental sustainability within their different management models. To help them achieve this, they have a number of different CSR management tools available to them. However, despite offering recommendations on how and where to contemplate the concepts of sustainability within organisations, such instruments do not define a set of guidelines or a structured framework for implementing those concepts. Accordingly, the aim of this paper is to enhance one of the tools that is most widely known and used in strategic management, the Balanced Scorecard, so that the concepts of sustainability can be implemented within the strategy and the day-to-day management of the enterprise. To do so, the case methodology was applied to 16 organisations in order to obtain what could be called a Sustainable Balanced Scorecard. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201069a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1357–1364
Titre : An integrated approach to shift-starting time selection and tour-schedule construction Type de document : texte imprimé Auteurs : Brusco, M. J., Auteur ; Johns, T. R., Auteur Année de publication : 2011 Article en page(s) : pp. 1357–1364 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling Integer programming Heuristics Tabu search Cutting plane Index. décimale : 001.424 Résumé : A common practice in personnel tour scheduling is to limit the number of permissible daily shift starting times. Accordingly, an important subproblem that arises in tour-scheduling problems is the selection of those starting times that are conducive to efficient satisfaction of labour requirements. A previously published heuristic for this problem is sequential in nature, whereby a subset of starting times is selected in the first stage and tours are constructed using the chosen starting times in the second stage. We propose an integrative procedure that overcomes many of the limitations inherent in the sequential approach. Our procedure, which uses tabu search for starting time selection and a cutting plane method for tour construction, was compared to integer programming and the previously published heuristic in two experiments using test conditions from the airport staffing literature. Although all methods performed well when the labour requirement patterns were consistent across days of the week, the new procedure yielded the best performance when such patterns were inconsistent. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201072a.html [article] An integrated approach to shift-starting time selection and tour-schedule construction [texte imprimé] / Brusco, M. J., Auteur ; Johns, T. R., Auteur . - 2011 . - pp. 1357–1364.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1357–1364
Mots-clés : Scheduling Integer programming Heuristics Tabu search Cutting plane Index. décimale : 001.424 Résumé : A common practice in personnel tour scheduling is to limit the number of permissible daily shift starting times. Accordingly, an important subproblem that arises in tour-scheduling problems is the selection of those starting times that are conducive to efficient satisfaction of labour requirements. A previously published heuristic for this problem is sequential in nature, whereby a subset of starting times is selected in the first stage and tours are constructed using the chosen starting times in the second stage. We propose an integrative procedure that overcomes many of the limitations inherent in the sequential approach. Our procedure, which uses tabu search for starting time selection and a cutting plane method for tour construction, was compared to integer programming and the previously published heuristic in two experiments using test conditions from the airport staffing literature. Although all methods performed well when the labour requirement patterns were consistent across days of the week, the new procedure yielded the best performance when such patterns were inconsistent. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201072a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1365–1375
Titre : Variable interval sampling in economical designs for online process control of attributes with misclassification errors Type de document : texte imprimé Auteurs : Bessegato, L., Auteur ; Quinino, R., Auteur ; Ho, L. L., Auteur Année de publication : 2011 Article en page(s) : pp. 1365–1375 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Quality control Online process control for attributes Economical design Misclassification errors Markov chain Variable inspection interval Index. décimale : 001.424 Résumé : Online process control consists of inspecting a single item at every mth items produced, where m is an integer greater than two. Based on the results of the inspection, one decides if the process is in-control (the fraction of conforming item is p1—state I) or out-of-control (the fraction of conforming item is p2—state II). If the inspected item is non-conforming, the process is designated as out-of-control and production is stopped for possible adjustment; otherwise, production goes on. In this paper, a contribution to online process control is presented, where the inspection system is considered to be subject to classification errors. After every adjustment, the sampling interval is L units (Lgreater than or equal tom), and in the case of non-adjustment, the sampling interval is m units. The expression for the average cost per produced item is calculated, and optimum parameters (the sampling intervals L and m) are obtained by a direct search. The procedure is illustrated by a numerical example. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201079a.html [article] Variable interval sampling in economical designs for online process control of attributes with misclassification errors [texte imprimé] / Bessegato, L., Auteur ; Quinino, R., Auteur ; Ho, L. L., Auteur . - 2011 . - pp. 1365–1375.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1365–1375
Mots-clés : Quality control Online process control for attributes Economical design Misclassification errors Markov chain Variable inspection interval Index. décimale : 001.424 Résumé : Online process control consists of inspecting a single item at every mth items produced, where m is an integer greater than two. Based on the results of the inspection, one decides if the process is in-control (the fraction of conforming item is p1—state I) or out-of-control (the fraction of conforming item is p2—state II). If the inspected item is non-conforming, the process is designated as out-of-control and production is stopped for possible adjustment; otherwise, production goes on. In this paper, a contribution to online process control is presented, where the inspection system is considered to be subject to classification errors. After every adjustment, the sampling interval is L units (Lgreater than or equal tom), and in the case of non-adjustment, the sampling interval is m units. The expression for the average cost per produced item is calculated, and optimum parameters (the sampling intervals L and m) are obtained by a direct search. The procedure is illustrated by a numerical example. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201079a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1376–1384
Titre : Construction and validation of distribution-based regression simulation metamodels Type de document : texte imprimé Auteurs : Reis dos Santos, M. I., Auteur ; Reis dos Santos, P. M., Auteur Année de publication : 2011 Article en page(s) : pp. 1376–1384 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Metamodels Methodology Simulation Regression Optimization Robust design Index. décimale : 001.424 Résumé : Metamodels are used as analysis tools for solving optimization problems. A metamodel is a simplification of the simulation model, representing the system's input–output relationship through a mathematical function with customized parameters. The proposed approach uses confidence intervals as an acceptance procedure, and as a predictive validation procedure when new points are employed. To improve the knowledge about the system, the response is depicted by modelling both the mean and variance functions of a normal distribution along the experimental region. Such metamodels are specially useful when the variance of the output varies significantly. These metamodels may be used for minimizing product quality loss and improving production robustness. The development of such metamodels is illustrated with two examples. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201064a.html [article] Construction and validation of distribution-based regression simulation metamodels [texte imprimé] / Reis dos Santos, M. I., Auteur ; Reis dos Santos, P. M., Auteur . - 2011 . - pp. 1376–1384.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1376–1384
Mots-clés : Metamodels Methodology Simulation Regression Optimization Robust design Index. décimale : 001.424 Résumé : Metamodels are used as analysis tools for solving optimization problems. A metamodel is a simplification of the simulation model, representing the system's input–output relationship through a mathematical function with customized parameters. The proposed approach uses confidence intervals as an acceptance procedure, and as a predictive validation procedure when new points are employed. To improve the knowledge about the system, the response is depicted by modelling both the mean and variance functions of a normal distribution along the experimental region. Such metamodels are specially useful when the variance of the output varies significantly. These metamodels may be used for minimizing product quality loss and improving production robustness. The development of such metamodels is illustrated with two examples. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201064a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1385–1390
Titre : Rating non-elite tennis players using team doubles competition results Type de document : texte imprimé Auteurs : Clarke, S. R., Auteur Année de publication : 2011 Article en page(s) : pp. 1385–1390 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Sports Tennis Regression Forecasting Exponential smoothing Home advantage Index. décimale : 001.424 Résumé : Statistical methods can be useful in rating non-elite tennis players. This paper shows how clubs can use simple optimization techniques to rate their club's players in doubles tennis competitions. Even though clubs lack all relevant information, the effects of home advantage, position played, partner and strength of team opposition can be taken into account and evaluated. The results from all competing clubs, available to the body organizing the competition, are used to rate all players in the competition, and validate the results that were obtained with limited information. We show a home ground advantage exists in non-elite doubles tennis. A simple exponential smoothing method of rating players is then tested, and shown to produce reasonable results. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201075a.html [article] Rating non-elite tennis players using team doubles competition results [texte imprimé] / Clarke, S. R., Auteur . - 2011 . - pp. 1385–1390.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1385–1390
Mots-clés : Sports Tennis Regression Forecasting Exponential smoothing Home advantage Index. décimale : 001.424 Résumé : Statistical methods can be useful in rating non-elite tennis players. This paper shows how clubs can use simple optimization techniques to rate their club's players in doubles tennis competitions. Even though clubs lack all relevant information, the effects of home advantage, position played, partner and strength of team opposition can be taken into account and evaluated. The results from all competing clubs, available to the body organizing the competition, are used to rate all players in the competition, and validate the results that were obtained with limited information. We show a home ground advantage exists in non-elite doubles tennis. A simple exponential smoothing method of rating players is then tested, and shown to produce reasonable results. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201075a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1391–1402
Titre : How to use a systems diagram to analyse and structure complex problems for policy issue papers Type de document : texte imprimé Auteurs : van der Lei, T. E., Auteur ; Enserink, B., Auteur ; Thissen, W. A. H., Auteur Année de publication : 2011 Article en page(s) : pp. 1391–1402 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : OR education Problem structuring Policy issue paper Policy analysis System diagram Complex problems Index. décimale : 001.424 Résumé : Many policy problems are complex in the sense that natural, technological, social and human elements interact. Problem exploration and structuring are essential as a basis for deliberate and focused approaches towards problem resolution. The results of problem exploration efforts can be laid down in the form of a policy issue paper. We have developed a systemic, stepwise approach, which has been elaborated and taught for over a decade to hundreds of students. This seven-step approach centers on the construction of a system diagram as a means to provide structure to the conceptualisation of a complex problem situation. The approach is based on a conscious combination of existing relatively straightforward analytical methods including objectives hierarchy, means-ends analysis, causal diagramming, stakeholder analysis, and contextual scenarios. The obtained insights are then summed up in a policy issue paper, which is the basis for further planning and research. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201028a.html [article] How to use a systems diagram to analyse and structure complex problems for policy issue papers [texte imprimé] / van der Lei, T. E., Auteur ; Enserink, B., Auteur ; Thissen, W. A. H., Auteur . - 2011 . - pp. 1391–1402.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1391–1402
Mots-clés : OR education Problem structuring Policy issue paper Policy analysis System diagram Complex problems Index. décimale : 001.424 Résumé : Many policy problems are complex in the sense that natural, technological, social and human elements interact. Problem exploration and structuring are essential as a basis for deliberate and focused approaches towards problem resolution. The results of problem exploration efforts can be laid down in the form of a policy issue paper. We have developed a systemic, stepwise approach, which has been elaborated and taught for over a decade to hundreds of students. This seven-step approach centers on the construction of a system diagram as a means to provide structure to the conceptualisation of a complex problem situation. The approach is based on a conscious combination of existing relatively straightforward analytical methods including objectives hierarchy, means-ends analysis, causal diagramming, stakeholder analysis, and contextual scenarios. The obtained insights are then summed up in a policy issue paper, which is the basis for further planning and research. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201028a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1403–1412
Titre : Minimizing the sum of maximum earliness and maximum tardiness in the single-machine scheduling problem with sequence-dependent setup time Type de document : texte imprimé Auteurs : Nekoiemehr, N., Auteur ; Moslehi, G., Auteur Année de publication : 2011 Article en page(s) : pp. 1403–1412 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling Single machine Maximum earliness Maximum tardiness Setup time Index. décimale : 001.424 Résumé : This paper considers the problem of scheduling a given number of jobs on a single machine to minimize the sum of maximum earliness and maximum tardiness when sequence-dependent setup times exist (1|STsd|ETmax). In this paper, an optimal branch-and-bound algorithm is developed that involves the implementation of lower and upper bounding procedures as well as three dominance rules. For solving problems containing large numbers of jobs, a polynomial time-bounded heuristic algorithm is also proposed. Computational experiments demonstrate the effectiveness of the bounding and dominance rules in achieving optimal solutions in more than 97% of the instances. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201094a.html [article] Minimizing the sum of maximum earliness and maximum tardiness in the single-machine scheduling problem with sequence-dependent setup time [texte imprimé] / Nekoiemehr, N., Auteur ; Moslehi, G., Auteur . - 2011 . - pp. 1403–1412.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1403–1412
Mots-clés : Scheduling Single machine Maximum earliness Maximum tardiness Setup time Index. décimale : 001.424 Résumé : This paper considers the problem of scheduling a given number of jobs on a single machine to minimize the sum of maximum earliness and maximum tardiness when sequence-dependent setup times exist (1|STsd|ETmax). In this paper, an optimal branch-and-bound algorithm is developed that involves the implementation of lower and upper bounding procedures as well as three dominance rules. For solving problems containing large numbers of jobs, a polynomial time-bounded heuristic algorithm is also proposed. Computational experiments demonstrate the effectiveness of the bounding and dominance rules in achieving optimal solutions in more than 97% of the instances. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201094a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1413–1419
Titre : Negative data in DEA : a simple proportional distance function approach Type de document : texte imprimé Auteurs : Kerstens, K., Auteur ; I. Van de Woestyne, Auteur Année de publication : 2011 Article en page(s) : pp. 1413–1419 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Data envelopment analysis Linear programming Optimization Production Finance Index. décimale : 001.424 Résumé : The need to adapt Data Envelopment Analysis (DEA) and other frontier models in the context of negative data has been a rather neglected issue in the literature. A recent article in this journal proposed a variation on the directional distance function, a very general distance function that is dual to the profit function, to accommodate the occurrence of negative data. In this contribution, we define and recommend a generalised Farrell proportional distance function that can do the same job and that maintains a proportional interpretation under mild conditions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010108a.html [article] Negative data in DEA : a simple proportional distance function approach [texte imprimé] / Kerstens, K., Auteur ; I. Van de Woestyne, Auteur . - 2011 . - pp. 1413–1419.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1413–1419
Mots-clés : Data envelopment analysis Linear programming Optimization Production Finance Index. décimale : 001.424 Résumé : The need to adapt Data Envelopment Analysis (DEA) and other frontier models in the context of negative data has been a rather neglected issue in the literature. A recent article in this journal proposed a variation on the directional distance function, a very general distance function that is dual to the profit function, to accommodate the occurrence of negative data. In this contribution, we define and recommend a generalised Farrell proportional distance function that can do the same job and that maintains a proportional interpretation under mild conditions. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010108a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1420–1422
Titre : The diet problem and DEA Type de document : texte imprimé Auteurs : Färe, R., Auteur ; Grosskopf, S., Auteur ; Margaritis, D., Auteur Année de publication : 2011 Article en page(s) : pp. 1420–1422 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : DEA Diet problem Profit maximization Index. décimale : 001.424 Résumé : In this paper we relate the Diet Problem, formulated by Stigler in 1945, to the data envelopment analysis version of the profit maximization model. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010113a.html [article] The diet problem and DEA [texte imprimé] / Färe, R., Auteur ; Grosskopf, S., Auteur ; Margaritis, D., Auteur . - 2011 . - pp. 1420–1422.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1420–1422
Mots-clés : DEA Diet problem Profit maximization Index. décimale : 001.424 Résumé : In this paper we relate the Diet Problem, formulated by Stigler in 1945, to the data envelopment analysis version of the profit maximization model. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors2010113a.html
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1423–1430
Titre : A hybrid genetic algorithmic approach to the maximally diverse grouping problem Type de document : texte imprimé Auteurs : Fan, Z. P., Auteur ; Y. Chen, Auteur ; Ma, J., Auteur Année de publication : 2011 Article en page(s) : pp. 1423–1430 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Genetic algorithm Maximally diverse grouping problem Local neighbourhood search Index. décimale : 001.424 Résumé : The maximally diverse grouping problem (MDGP) is a NP-complete problem. For such NP-complete problems, heuristics play a major role in searching for solutions. Most of the heuristics for MDGP focus on the equal group-size situation. In this paper, we develop a genetic algorithm (GA)-based hybrid heuristic to solve this problem considering not only the equal group-size situation but also the different group-size situation. The performance of the algorithm is compared with the established Lotfi–Cerveny–Weitz algorithm and the non-hybrid GA. Computational experience indicates that the proposed GA-based hybrid algorithm is a good tool for solving MDGP. Moreover, it can be easily modified to solve other equivalent problems. Note de contenu : Corrections to: Journal of the Operational Research Society (2010). doi:10.1057/jors.2009.168; published online 6 January 2010 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201092a.html [article] A hybrid genetic algorithmic approach to the maximally diverse grouping problem [texte imprimé] / Fan, Z. P., Auteur ; Y. Chen, Auteur ; Ma, J., Auteur . - 2011 . - pp. 1423–1430.
Recherche opérationnelle
Langues : Anglais (eng)
in Journal of the operational research society (JORS) > Vol. 62 N° 7 (Juillet 2011) . - pp. 1423–1430
Mots-clés : Genetic algorithm Maximally diverse grouping problem Local neighbourhood search Index. décimale : 001.424 Résumé : The maximally diverse grouping problem (MDGP) is a NP-complete problem. For such NP-complete problems, heuristics play a major role in searching for solutions. Most of the heuristics for MDGP focus on the equal group-size situation. In this paper, we develop a genetic algorithm (GA)-based hybrid heuristic to solve this problem considering not only the equal group-size situation but also the different group-size situation. The performance of the algorithm is compared with the established Lotfi–Cerveny–Weitz algorithm and the non-hybrid GA. Computational experience indicates that the proposed GA-based hybrid algorithm is a good tool for solving MDGP. Moreover, it can be easily modified to solve other equivalent problems. Note de contenu : Corrections to: Journal of the Operational Research Society (2010). doi:10.1057/jors.2009.168; published online 6 January 2010 DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n7/abs/jors201092a.html
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