Dépouillements

An algorithm of workforce scheduling for maintenance optimization / Sakon Wongmongkolrit in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.163-169 Titre : An algorithm of workforce scheduling for maintenance optimization Type de document : texte imprimé Auteurs : Sakon Wongmongkolrit, Auteur ; Bordin Rassameethes, Auteur Année de publication : 2011 Article en page(s) : pp.163-169 Note générale : Management Langues : Anglais (eng) Mots-clés : Workforce  scheulding  Personal  assignment  Optimal  maintenance  policy Résumé : Workforce scheduling for maintenance and personal assignment concept are very important for all manufacturers. Most of them have to ensure that their staffs are to be fitted to their jobs and responsibilities. Especially, the maintenance approach may require amount appropriate workforce or manpower for doing both of preventive and corrective maintenance activities, whilst the maintenance scheduling and algorithm concept are useful for solving and fitting the personal assignment, with neither of overstaffing nor understaffing. Our concept and algorithm have developed from previous research studies and fulfilled the niches of those studies such as the complying to the labor law (the consecutive day work and day off), the mixture policy of preventive and corrective maintenance, probabilistic failure rate and deterministic of staff assignment, cyclic shift working and equality of staffs' day off on weekend. However, we did not avoid minimizing labour cost, and utilized worker activities. So, our algorithm will be a new managerial solution for all manufacturers who have a problem with their maintainability about staff assignment. Especially, the manufacturers who have continuously worked 24 hours and 7 days, without any vacations such as airport, mass rapid transit, Just-In-Time manufacturer and so on. Most of them might be gotten the benefit and taken an advantage from this research study. Furthermore, our concept and algorithm of staff assignment can be applied to the service sector's personal required for each shift and each day which is conformed to the probabilistic of customers' demand for each period. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?129.html [article] An algorithm of workforce scheduling for maintenance optimization [texte imprimé] / Sakon Wongmongkolrit, Auteur ; Bordin Rassameethes, Auteur . - 2011 . - pp.163-169. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.163-169 Mots-clés : Workforce  scheulding  Personal  assignment  Optimal  maintenance  policy Résumé : Workforce scheduling for maintenance and personal assignment concept are very important for all manufacturers. Most of them have to ensure that their staffs are to be fitted to their jobs and responsibilities. Especially, the maintenance approach may require amount appropriate workforce or manpower for doing both of preventive and corrective maintenance activities, whilst the maintenance scheduling and algorithm concept are useful for solving and fitting the personal assignment, with neither of overstaffing nor understaffing. Our concept and algorithm have developed from previous research studies and fulfilled the niches of those studies such as the complying to the labor law (the consecutive day work and day off), the mixture policy of preventive and corrective maintenance, probabilistic failure rate and deterministic of staff assignment, cyclic shift working and equality of staffs' day off on weekend. However, we did not avoid minimizing labour cost, and utilized worker activities. So, our algorithm will be a new managerial solution for all manufacturers who have a problem with their maintainability about staff assignment. Especially, the manufacturers who have continuously worked 24 hours and 7 days, without any vacations such as airport, mass rapid transit, Just-In-Time manufacturer and so on. Most of them might be gotten the benefit and taken an advantage from this research study. Furthermore, our concept and algorithm of staff assignment can be applied to the service sector's personal required for each shift and each day which is conformed to the probabilistic of customers' demand for each period. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?129.html

An inventory model for deteriorating items with inflation induced demand and exponential partial backorders---a discounted cash flow approach / A. Thangam in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.170-174 Titre : An inventory model for deteriorating items with inflation induced demand and exponential partial backorders---a discounted cash flow approach Type de document : texte imprimé Auteurs : A. Thangam, Auteur ; R. Uthayakumar, Auteur Année de publication : 2011 Article en page(s) : pp.170-174 Note générale : Management Langues : Anglais (eng) Mots-clés : Inventory  Inflation  Partial  backordering  Deteriorating  items Résumé : Now-a-days the financial situation has changed at different countries due to inflation i.e. time value of money. As inflation increases the value of money goes down and it erodes the future worth of savings and forces one for more current spending. Usually, these spending are on peripherals and luxury items that give rise to demand of these items. In this paper, we intend to develop an inventory model for deteriorating items under inflationary conditions using a discounted cash flow (DCF) approach over a finite planning horizon. The demand rate is a function of inflation. In real life systems, some but not all customers will wait for the next order to satisfy their demands during stockout period. This situation is modeled by the consideration of partial backordering under negative exponential distribution of waiting time. An algorithm is developed to find optimal policy and the sensitivity analysis is studied with the help of numerical examples. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?130.html [article] An inventory model for deteriorating items with inflation induced demand and exponential partial backorders---a discounted cash flow approach [texte imprimé] / A. Thangam, Auteur ; R. Uthayakumar, Auteur . - 2011 . - pp.170-174. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.170-174 Mots-clés : Inventory  Inflation  Partial  backordering  Deteriorating  items Résumé : Now-a-days the financial situation has changed at different countries due to inflation i.e. time value of money. As inflation increases the value of money goes down and it erodes the future worth of savings and forces one for more current spending. Usually, these spending are on peripherals and luxury items that give rise to demand of these items. In this paper, we intend to develop an inventory model for deteriorating items under inflationary conditions using a discounted cash flow (DCF) approach over a finite planning horizon. The demand rate is a function of inflation. In real life systems, some but not all customers will wait for the next order to satisfy their demands during stockout period. This situation is modeled by the consideration of partial backordering under negative exponential distribution of waiting time. An algorithm is developed to find optimal policy and the sensitivity analysis is studied with the help of numerical examples. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?130.html

Applying fuzzy particle swarm optimization to multi-unit double auctions / Calogero Vetro in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.175-181 Titre : Applying fuzzy particle swarm optimization to multi-unit double auctions Type de document : texte imprimé Auteurs : Calogero Vetro, Auteur ; Francesca Vetro, Auteur Année de publication : 2011 Article en page(s) : pp.175-181 Note générale : Management Langues : Anglais (eng) Mots-clés : Particle  swarm  optimization  Fuzzy  numbers  Mathematical  programming  Quadratic  assignment  problem Résumé : In the context of Quadratic Programming Problems, we use a fuzzy Particle Swarm Optimization (PSO) algorithm to analyze a Multi-unit Double Auction (MDA) market. We give also a Linear Programming (LP) based upper bound to help the decision maker in dealing with constraints in the mathematical model. In the computational study, we evaluate our algorithm and show that it is a feasible approach for processing bids and calculating assignments. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?131.html [article] Applying fuzzy particle swarm optimization to multi-unit double auctions [texte imprimé] / Calogero Vetro, Auteur ; Francesca Vetro, Auteur . - 2011 . - pp.175-181. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.175-181 Mots-clés : Particle  swarm  optimization  Fuzzy  numbers  Mathematical  programming  Quadratic  assignment  problem Résumé : In the context of Quadratic Programming Problems, we use a fuzzy Particle Swarm Optimization (PSO) algorithm to analyze a Multi-unit Double Auction (MDA) market. We give also a Linear Programming (LP) based upper bound to help the decision maker in dealing with constraints in the mathematical model. In the computational study, we evaluate our algorithm and show that it is a feasible approach for processing bids and calculating assignments. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?131.html

Ultimate ownership and firm performance / Kun Su in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.182-191 Titre : Ultimate ownership and firm performance : evidence from chinese private listed firms Type de document : texte imprimé Auteurs : Kun Su, Auteur ; Shu'e Yang, Auteur ; Bei Yang, Auteur Année de publication : 2011 Article en page(s) : pp.182-191 Note générale : Management Langues : Anglais (eng) Mots-clés : Ultimat  control  Free  cash  flow  Firm  performance  P-P  conflict Résumé : Compared with the traditional principal-agent conflicts which are investigated heavily in previous studies in developed countries, principal-principal conflicts between ultimate controlling shareholders and minority shareholders are much more important in emerging countries. From the perspective of ultimate ownership structure, by tracing the identity of large shareholders, we find that most of Chinese private listed firms have a ultimate controlling shareholder. This study investigates both the impact of cash flow right and the divergence between the control right and cash flow right of ultimate controlling shareholder on firm performance, and the constraint effect of free cash flows on ultimate controlling shareholders' entrenchment behaviors. We find that the cash flow right and firm performance are significantly positively related, and there is an "incentive effect" for ultimate controlling shareholders; the ivergence between the control right and cash flow right is significantly negatively associated with firm performance, and ultimate controlling shareholders have an "entrenchment effect" on firms; Further, we find that ultimate controlling shareholders' entrenchment behavior occurs only when they have the "ability" and "motivation", and the "opportunity" of having sufficient free cash flows. Therefore, lower free cash flows can efficiently constrain such entrenchment behaviors of ultimate controlling shareholders. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?132.html [article] Ultimate ownership and firm performance : evidence from chinese private listed firms [texte imprimé] / Kun Su, Auteur ; Shu'e Yang, Auteur ; Bei Yang, Auteur . - 2011 . - pp.182-191. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.182-191 Mots-clés : Ultimat  control  Free  cash  flow  Firm  performance  P-P  conflict Résumé : Compared with the traditional principal-agent conflicts which are investigated heavily in previous studies in developed countries, principal-principal conflicts between ultimate controlling shareholders and minority shareholders are much more important in emerging countries. From the perspective of ultimate ownership structure, by tracing the identity of large shareholders, we find that most of Chinese private listed firms have a ultimate controlling shareholder. This study investigates both the impact of cash flow right and the divergence between the control right and cash flow right of ultimate controlling shareholder on firm performance, and the constraint effect of free cash flows on ultimate controlling shareholders' entrenchment behaviors. We find that the cash flow right and firm performance are significantly positively related, and there is an "incentive effect" for ultimate controlling shareholders; the ivergence between the control right and cash flow right is significantly negatively associated with firm performance, and ultimate controlling shareholders have an "entrenchment effect" on firms; Further, we find that ultimate controlling shareholders' entrenchment behavior occurs only when they have the "ability" and "motivation", and the "opportunity" of having sufficient free cash flows. Therefore, lower free cash flows can efficiently constrain such entrenchment behaviors of ultimate controlling shareholders. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?132.html

Optimal reliability, production lotsize and safety stock / Biswajit Sarkar in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.192-202 Titre : Optimal reliability, production lotsize and safety stock : an economic manufacturing quantity model Type de document : texte imprimé Auteurs : Biswajit Sarkar, Auteur ; Shib Sankar Sana, Auteur ; Kripasindhu Chaudhuri, Auteur Année de publication : 2011 Article en page(s) : pp.192-202 Note générale : Management Langues : Anglais (eng) Mots-clés : Reliability  Preventive  maintenance  Corrective  maintenance  Safety  stock  Shortage Résumé : Reliability based maintenance provides sound guidance for managers who wish to attain high standards of maintenance at their operating systems. Basically, the amount and the type of maintenance applied for the system depend strongly on the age of components of a machinery system. The present paper describes a production policy (resumption and non-resumption) in order to find out an optimal safety stock, production lotsize and reliability parameters. A production-inventory model with stochastic machine breakdown and its corrective and regular (preventive) repairs with safety stock has been developed incorporating variable reliability parameters. The reliability parameter (ө) is a design variable. Learning effects result in the cost of technology for the design variable which is an decreasing function of (ө) and this, in turn, has an impact on the average cost. Hence the setting of optimal values of reliability parameters and production lotsize with safety stock needs to be considered jointly that achieves the smallest average integrated costs. The Kuhn-Tucker method is used to obtain an optimal solution for reliability parameters, production lotsize and safety stock. Finally, numerical examples with sensitivity analysis of key parameters are given to illustrate the proposed model. Several graphical llustrations of the model are given. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?133.html [article] Optimal reliability, production lotsize and safety stock : an economic manufacturing quantity model [texte imprimé] / Biswajit Sarkar, Auteur ; Shib Sankar Sana, Auteur ; Kripasindhu Chaudhuri, Auteur . - 2011 . - pp.192-202. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.192-202 Mots-clés : Reliability  Preventive  maintenance  Corrective  maintenance  Safety  stock  Shortage Résumé : Reliability based maintenance provides sound guidance for managers who wish to attain high standards of maintenance at their operating systems. Basically, the amount and the type of maintenance applied for the system depend strongly on the age of components of a machinery system. The present paper describes a production policy (resumption and non-resumption) in order to find out an optimal safety stock, production lotsize and reliability parameters. A production-inventory model with stochastic machine breakdown and its corrective and regular (preventive) repairs with safety stock has been developed incorporating variable reliability parameters. The reliability parameter (ө) is a design variable. Learning effects result in the cost of technology for the design variable which is an decreasing function of (ө) and this, in turn, has an impact on the average cost. Hence the setting of optimal values of reliability parameters and production lotsize with safety stock needs to be considered jointly that achieves the smallest average integrated costs. The Kuhn-Tucker method is used to obtain an optimal solution for reliability parameters, production lotsize and safety stock. Finally, numerical examples with sensitivity analysis of key parameters are given to illustrate the proposed model. Several graphical llustrations of the model are given. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?133.html

Modelling risks to manufacturer and buyer for lifetime warranty policies / Anisur Rahman in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.203-209 Titre : Modelling risks to manufacturer and buyer for lifetime warranty policies Type de document : texte imprimé Auteurs : Anisur Rahman, Auteur ; Gopinath Chattopadhyay, Auteur Année de publication : 2011 Article en page(s) : pp.203-209 Note générale : Management Langues : Anglais (eng) Mots-clés : Lifetime  warranty  Risk  preferences  Warranty  price  Buyer's  repair  cost Résumé : Currently, manufacturers/dealers have started selling products with lifetime warranty policies. In this paper, risk attitudes of both buyers and manufacturer/dealers to lifetime warranty policies are discussed. In line with Chun and Tang (1995) [2], Risk models are developed for products with time dependent failure intensity (rate). These models have been proposed with Non homogeneous Poisson's process for failure intensity function, a constant repair cost, and concave utility function. Using the exponential utility function, the decision models are developed to maximise the manufacturer/dealer's certainty profit equivalent. Risk preference models are developed to find the optimal warranty price through the use of the manufacturer's utility function for profit and the buyer's utility function for repair costs. Finally, the sensitivity of the warranty price models is analysed using numerical examples. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?134.html [article] Modelling risks to manufacturer and buyer for lifetime warranty policies [texte imprimé] / Anisur Rahman, Auteur ; Gopinath Chattopadhyay, Auteur . - 2011 . - pp.203-209. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.203-209 Mots-clés : Lifetime  warranty  Risk  preferences  Warranty  price  Buyer's  repair  cost Résumé : Currently, manufacturers/dealers have started selling products with lifetime warranty policies. In this paper, risk attitudes of both buyers and manufacturer/dealers to lifetime warranty policies are discussed. In line with Chun and Tang (1995) [2], Risk models are developed for products with time dependent failure intensity (rate). These models have been proposed with Non homogeneous Poisson's process for failure intensity function, a constant repair cost, and concave utility function. Using the exponential utility function, the decision models are developed to maximise the manufacturer/dealer's certainty profit equivalent. Risk preference models are developed to find the optimal warranty price through the use of the manufacturer's utility function for profit and the buyer's utility function for repair costs. Finally, the sensitivity of the warranty price models is analysed using numerical examples. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?134.html

An AHP approach to assess new product development performance / Kit Fai Pun in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.210-218 Titre : An AHP approach to assess new product development performance : an exploratory study Type de document : texte imprimé Auteurs : Kit Fai Pun, Auteur ; Kwai Sang Chin, Auteur ; Man Yin Rebecca Yiu, Auteur Année de publication : 2011 Article en page(s) : pp.210-218 Note générale : Management Langues : Anglais (eng) Mots-clés : Performance  Self-assessment  Criteria  NPD  AHP Résumé : Managing new product development (NPD) becomes crucial for manufacturers particularly those small and medium-sized enterprises (SMEs) to survive in today's competitive marketplaces. This paper is geared toward the development of generic self-assessment model for SMEs to determine their performance in NPD practices. It reviews a list of sixteen elements under five decision areas as advocated in literature that affect NPD practices. Incorporated the findings of focus group interviews with industry practitioners and experts, a self-assessment model of NPD performance is devised using the Analytical Hierarchy Process (AHP) approach. The conduct of the exploratory study is presented to illustrate how the decision/performance criteria be prioritised and the scoring guidelines be established. It is anticipated that the findings would drive the self-assessment initiatives of NPD in SMEs and provide them with a feasible means to amalgamate strategies and actions. Further research is needed to investigate into the applicability of the model with empirical evidence in industry. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?135.html [article] An AHP approach to assess new product development performance : an exploratory study [texte imprimé] / Kit Fai Pun, Auteur ; Kwai Sang Chin, Auteur ; Man Yin Rebecca Yiu, Auteur . - 2011 . - pp.210-218. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.210-218 Mots-clés : Performance  Self-assessment  Criteria  NPD  AHP Résumé : Managing new product development (NPD) becomes crucial for manufacturers particularly those small and medium-sized enterprises (SMEs) to survive in today's competitive marketplaces. This paper is geared toward the development of generic self-assessment model for SMEs to determine their performance in NPD practices. It reviews a list of sixteen elements under five decision areas as advocated in literature that affect NPD practices. Incorporated the findings of focus group interviews with industry practitioners and experts, a self-assessment model of NPD performance is devised using the Analytical Hierarchy Process (AHP) approach. The conduct of the exploratory study is presented to illustrate how the decision/performance criteria be prioritised and the scoring guidelines be established. It is anticipated that the findings would drive the self-assessment initiatives of NPD in SMEs and provide them with a feasible means to amalgamate strategies and actions. Further research is needed to investigate into the applicability of the model with empirical evidence in industry. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?135.html

Flexible flow shop with sequence-dependent setup times and machine availability constraints / Nikbakhsh Javadian in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.219-226 Titre : Flexible flow shop with sequence-dependent setup times and machine availability constraints Type de document : texte imprimé Auteurs : Nikbakhsh Javadian, Auteur ; Mehdi Amiri-Aref, Auteur ; Ali Hadighi, Auteur Année de publication : 2011 Article en page(s) : pp.219-226 Note générale : Management Langues : Anglais (eng) Mots-clés : Flexible  flow  shop  Availability  constraints  Dependent  setup  time  GA  VNS Résumé : This paper considers the flexible flow shop problem along with sequence-dependent setup time and machine availability constraints as two significant criteria for minimizing the total completion time with modified processing time. Not many works have been done in this field; the necessity of more researches for finding better solutions is the main motivation to implement the heuristic and meta- euristic algorithms. So, considering both preventive maintenance (PM) and sequence-dependent setup times in production planning horizon simultaneously, which a few works have been done in this field, can strongly influence on the efficiency of manufacturing environments. Six heuristic algorithms (SMPT, LMPT, Johnson, CDS, Palmer, and MNEH) that consider modified processing time are presented. Additionally, two meta-heuristic algorithms, the variable neighborhood search (VNS) algorithm and the genetic algorithm (GA), are applied to solve such problems. The purpose of this survey is to evaluate the performance of the heuristic and meta-heuristic algorithms for the proposed scheduling problem. The computational result shows the efficiency of the proposed solution methods. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?136.html [article] Flexible flow shop with sequence-dependent setup times and machine availability constraints [texte imprimé] / Nikbakhsh Javadian, Auteur ; Mehdi Amiri-Aref, Auteur ; Ali Hadighi, Auteur . - 2011 . - pp.219-226. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.219-226 Mots-clés : Flexible  flow  shop  Availability  constraints  Dependent  setup  time  GA  VNS Résumé : This paper considers the flexible flow shop problem along with sequence-dependent setup time and machine availability constraints as two significant criteria for minimizing the total completion time with modified processing time. Not many works have been done in this field; the necessity of more researches for finding better solutions is the main motivation to implement the heuristic and meta- euristic algorithms. So, considering both preventive maintenance (PM) and sequence-dependent setup times in production planning horizon simultaneously, which a few works have been done in this field, can strongly influence on the efficiency of manufacturing environments. Six heuristic algorithms (SMPT, LMPT, Johnson, CDS, Palmer, and MNEH) that consider modified processing time are presented. Additionally, two meta-heuristic algorithms, the variable neighborhood search (VNS) algorithm and the genetic algorithm (GA), are applied to solve such problems. The purpose of this survey is to evaluate the performance of the heuristic and meta-heuristic algorithms for the proposed scheduling problem. The computational result shows the efficiency of the proposed solution methods. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?136.html

Finite buffer renewal input multiple exponential vacations queue with accessible and non-accessible batches / P. Vijaya Laxmi in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.227-234 Titre : Finite buffer renewal input multiple exponential vacations queue with accessible and non-accessible batches Type de document : texte imprimé Auteurs : P. Vijaya Laxmi, Auteur ; V. Goswami, Auteur ; O. M. Yesuf, Auteur Année de publication : 2011 Article en page(s) : pp.227-234 Note générale : Management Langues : Anglais (eng) Mots-clés : Queueing  Markov  chain  Probability-random  processes  Traffic  control  mathematical  models Résumé : In this paper, we study a finite buffer single server accessible and non-accessible batch service queue with multiple exponential vacations. The inter-arrival and service times are, respectively, arbitrarily and exponentially distributed. Using the supplementary variable technique (SVT) and the embedded Markov chain technique (EMCT), we obtain the steady state system (queue) length distributions at pre-arrival and arbitrary epochs. Some numerical results are presented in the form of table and graphs. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?137.html [article] Finite buffer renewal input multiple exponential vacations queue with accessible and non-accessible batches [texte imprimé] / P. Vijaya Laxmi, Auteur ; V. Goswami, Auteur ; O. M. Yesuf, Auteur . - 2011 . - pp.227-234. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.227-234 Mots-clés : Queueing  Markov  chain  Probability-random  processes  Traffic  control  mathematical  models Résumé : In this paper, we study a finite buffer single server accessible and non-accessible batch service queue with multiple exponential vacations. The inter-arrival and service times are, respectively, arbitrarily and exponentially distributed. Using the supplementary variable technique (SVT) and the embedded Markov chain technique (EMCT), we obtain the steady state system (queue) length distributions at pre-arrival and arbitrary epochs. Some numerical results are presented in the form of table and graphs. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?137.html

A two echelon location-routing model with considering Value-at-Risk measure / Nader Azad in International journal of management science and engineering management, Vol. 5 N° 3 (Juin 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.235-240 Titre : A two echelon location-routing model with considering Value-at-Risk measure Type de document : texte imprimé Auteurs : Nader Azad, Auteur ; Hamid Davoudpour, Auteur Année de publication : 2011 Article en page(s) : pp.235-240 Note générale : Management Langues : Anglais (eng) Mots-clés : Supply  chain  network  Location  -routing  Value-at-risk  Tabu  search Résumé : In this paper, we present a distribution network design problem in supply chain system which optimizes location, and routing decisions. We propose a two-stage supply chain model which involves determining simultaneously the best sites for the distribution centers and determining capacity for distribution centers and the best strategy for distributing the product from the suppliers to the distribution centers and from distribution centers to the customers and the routes of the vehicles. Each customer's demand is uncertain and follows a normal distribution. For the first time in the location-routing problem, we introduce a new solution methodology that adopts from the finance literature, to optimize the Value-at-Risk (VaR) measure in our problem.A heuristic method is developed for solving the problem. The heuristic method is decomposed into two phases: distribution center location-allocation phase, and routing phase. First of all, an initial solution is determined, then a Tabu search algorithm is used to improve the initial solution for each phase separately and alternatively. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?138.html [article] A two echelon location-routing model with considering Value-at-Risk measure [texte imprimé] / Nader Azad, Auteur ; Hamid Davoudpour, Auteur . - 2011 . - pp.235-240. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 3 (Juin 2010) . - pp.235-240 Mots-clés : Supply  chain  network  Location  -routing  Value-at-risk  Tabu  search Résumé : In this paper, we present a distribution network design problem in supply chain system which optimizes location, and routing decisions. We propose a two-stage supply chain model which involves determining simultaneously the best sites for the distribution centers and determining capacity for distribution centers and the best strategy for distributing the product from the suppliers to the distribution centers and from distribution centers to the customers and the routes of the vehicles. Each customer's demand is uncertain and follows a normal distribution. For the first time in the location-routing problem, we introduce a new solution methodology that adopts from the finance literature, to optimize the Value-at-Risk (VaR) measure in our problem.A heuristic method is developed for solving the problem. The heuristic method is decomposed into two phases: distribution center location-allocation phase, and routing phase. First of all, an initial solution is determined, then a Tabu search algorithm is used to improve the initial solution for each phase separately and alternatively. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?138.html

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