Dépouillements

Ordering cost reduction in probabilistic inventory model with controllable lead time and a service level / K. Annadurai in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.403-410 Titre : Ordering cost reduction in probabilistic inventory model with controllable lead time and a service level Type de document : texte imprimé Auteurs : K. Annadurai, Auteur ; R. Uthayakumar, Auteur Année de publication : 2011 Article en page(s) : pp.403-410 Note générale : Management Langues : Anglais (eng) Mots-clés : Inventory  Ordering  cost  reduction  Service  level  constraint  Optimization Résumé : The issues of lead time reduction and ordering cost reduction in inventory management have become a matter of great interest. We present and analyze a probabilistic inventory model under continuous review for the system with controllable lead time and optimal ordering cost caused by investment strategy subject to a service level constraint. We assume that the lead time demand has a mixture of normal distributions. Instead of having a stock-out term in the objective function, a service level constraint is added. Computational algorithm using the software Matlab 7.0 is developed to find the optimal solution. Numerical examples are also given to illustrate the results and sensitivity analysis of the optimal solution with respect to the parameters of the system is carried out. By using our proposed model, we obtain a significant amount of savings, range from 5.42% to 5.93%. Finally, the effect of investment to reduce ordering cost is investigated. The numerical example shows that the model with varying order cost is better than the model with fixed ordering cost. One of the repercussions of this convergence is that if the ordering cost could be reduced effectively, then the total relevant cost per unit time could be automatically improved. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?158.html [article] Ordering cost reduction in probabilistic inventory model with controllable lead time and a service level [texte imprimé] / K. Annadurai, Auteur ; R. Uthayakumar, Auteur . - 2011 . - pp.403-410. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.403-410 Mots-clés : Inventory  Ordering  cost  reduction  Service  level  constraint  Optimization Résumé : The issues of lead time reduction and ordering cost reduction in inventory management have become a matter of great interest. We present and analyze a probabilistic inventory model under continuous review for the system with controllable lead time and optimal ordering cost caused by investment strategy subject to a service level constraint. We assume that the lead time demand has a mixture of normal distributions. Instead of having a stock-out term in the objective function, a service level constraint is added. Computational algorithm using the software Matlab 7.0 is developed to find the optimal solution. Numerical examples are also given to illustrate the results and sensitivity analysis of the optimal solution with respect to the parameters of the system is carried out. By using our proposed model, we obtain a significant amount of savings, range from 5.42% to 5.93%. Finally, the effect of investment to reduce ordering cost is investigated. The numerical example shows that the model with varying order cost is better than the model with fixed ordering cost. One of the repercussions of this convergence is that if the ordering cost could be reduced effectively, then the total relevant cost per unit time could be automatically improved. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?158.html

Gradient method in solving nonlinear cost of quality functions in supply chain network design / Chaher Alzaman in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.411-421 Titre : Gradient method in solving nonlinear cost of quality functions in supply chain network design Type de document : texte imprimé Auteurs : Chaher Alzaman, Auteur ; Amar Ramudhin, Auteur ; Akif Asil Bulgak, Auteur Année de publication : 2011 Article en page(s) : pp.411-421 Note générale : Management Langues : Anglais (eng) Mots-clés : Supply  chain  network  design  Cost  of  quality  Mathematical  programming  Gradient  search Résumé : The design of a supply chain network is of great importance as it aims at optimizing costs throughout the supply chain. Traditionally, this optimization has considered operations related costs such as sourcing, production, transportation, inventory at each site in the network. Quality related costs were either ignored or considered indirectly. In a previous work, we showed how Cost of Quality (COQ) functions can be used as a viable indicator of the level of quality at each site and integrated in supply chain network design (SCND) models. This results in a non-linear MIP model, which poses challenges to solve. In this work, we develop a gradient-search based solution procedure to solve the model effectively for practical implications. The integration of COQ functions allows managers to explicitly consider the maturity levels of both internal sites (plants) and external partners such as suppliers or subcontractors. More importantly, it can be used as an additional metric by which the partners are measured during the annual evaluation process to see if they have progressed in their maturity levels, i.e. in mastering the costs of quality. COQ also opens a new avenue of research in SCND as the model and hence the solution procedure will vary based on the different ways COQ functions are incorporated in the model. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?159.html [article] Gradient method in solving nonlinear cost of quality functions in supply chain network design [texte imprimé] / Chaher Alzaman, Auteur ; Amar Ramudhin, Auteur ; Akif Asil Bulgak, Auteur . - 2011 . - pp.411-421. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.411-421 Mots-clés : Supply  chain  network  design  Cost  of  quality  Mathematical  programming  Gradient  search Résumé : The design of a supply chain network is of great importance as it aims at optimizing costs throughout the supply chain. Traditionally, this optimization has considered operations related costs such as sourcing, production, transportation, inventory at each site in the network. Quality related costs were either ignored or considered indirectly. In a previous work, we showed how Cost of Quality (COQ) functions can be used as a viable indicator of the level of quality at each site and integrated in supply chain network design (SCND) models. This results in a non-linear MIP model, which poses challenges to solve. In this work, we develop a gradient-search based solution procedure to solve the model effectively for practical implications. The integration of COQ functions allows managers to explicitly consider the maturity levels of both internal sites (plants) and external partners such as suppliers or subcontractors. More importantly, it can be used as an additional metric by which the partners are measured during the annual evaluation process to see if they have progressed in their maturity levels, i.e. in mastering the costs of quality. COQ also opens a new avenue of research in SCND as the model and hence the solution procedure will vary based on the different ways COQ functions are incorporated in the model. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?159.html

Modelling telecommunications network cost reductions by resource sharing—infrastructure sharing, regionalization, centralization, out-tasking, outsourcing, and managed services / Thomas Frisanco in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.422-432 Titre : Modelling telecommunications network cost reductions by resource sharing—infrastructure sharing, regionalization, centralization, out-tasking, outsourcing, and managed services Type de document : texte imprimé Auteurs : Thomas Frisanco, Auteur Année de publication : 2011 Article en page(s) : pp.422-432 Note générale : Management Langues : Anglais (eng) Mots-clés : Network  operation  Network  infrastructure  sharing  Managed  services  Out  tasking  Outsourcing Résumé : Currently, a trend of emerging market “regional champion” telecommunications network operators to spread operations across multiple countries can be observed. Consolidation of such operations becomes mission-critical in order to provide consistently high service levels in a cost-efficient manner. This leads to an increased demand for innovative, cross-country delivery platforms for network operations. Apart from the obvious technical issues, also strategic and economic aspects need to be taken into account when determining the optimal, resource-sharing re-design of network operations processes. Both in-house and outsourcing alternatives should be included in such an evaluation. This paper presents the technical approaches and the strategic and economic impacts of regionalization, centralization and outsourcing of mobile network operations processes. It introduces a quantitative model for assessing economic impacts using both a top-down and a bottom-up approach, applied to a real-world case of a MEA cross-country operator. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?160.html [article] Modelling telecommunications network cost reductions by resource sharing—infrastructure sharing, regionalization, centralization, out-tasking, outsourcing, and managed services [texte imprimé] / Thomas Frisanco, Auteur . - 2011 . - pp.422-432. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.422-432 Mots-clés : Network  operation  Network  infrastructure  sharing  Managed  services  Out  tasking  Outsourcing Résumé : Currently, a trend of emerging market “regional champion” telecommunications network operators to spread operations across multiple countries can be observed. Consolidation of such operations becomes mission-critical in order to provide consistently high service levels in a cost-efficient manner. This leads to an increased demand for innovative, cross-country delivery platforms for network operations. Apart from the obvious technical issues, also strategic and economic aspects need to be taken into account when determining the optimal, resource-sharing re-design of network operations processes. Both in-house and outsourcing alternatives should be included in such an evaluation. This paper presents the technical approaches and the strategic and economic impacts of regionalization, centralization and outsourcing of mobile network operations processes. It introduces a quantitative model for assessing economic impacts using both a top-down and a bottom-up approach, applied to a real-world case of a MEA cross-country operator. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?160.html

Reliability indices of a geo/G/1/1 erlang loss system with active breakdowns under bernoulli schedule / Zaiming Liu in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.433-438 Titre : Reliability indices of a geo/G/1/1 erlang loss system with active breakdowns under bernoulli schedule Type de document : texte imprimé Auteurs : Zaiming Liu, Auteur ; Shan Gao, Auteur Année de publication : 2011 Article en page(s) : pp.433-438 Note générale : Management Langues : Anglais (eng) Mots-clés : Erlang  loss  system  Unreliable  server  Bernoulli  schedule  Supplementary  variable  technique Résumé : This paper deals with a discrete-time Erlang loss system, in which breakdowns occur randomly at any instant while the server is serving the customers. As soon as breakdown occurs, the server is sent to repair directly, the customer being served before server breakdown decides, with probability 1−q, to depart the system (impatient customer) and, with complementary probability q(0≤q≤1), to wait for the server to complete his remaining service (patient customer). Additionally, Bernoulli vacation schedule is introduced into this model: after completion of each repair without interrupted customer waiting there or after completion of service, the server either goes for a vacation with probability θ(0≤θ≤1) or may wait for serving the next customer with complementary probability 1 −θ. Firstly, we obtain the z-transforms of the probabilities of server state by using a new type discrete supplementary variable technique. Secondly, we present some performance measures of this model, such as the steady-state availability, failure frequency of the system, mean time to the first failure and the probabilities when the server is idle, busy, down or on vacation. Finally, some numerical examples show the influence of the parameters on some crucial performance characteristics of the system. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?161.html [article] Reliability indices of a geo/G/1/1 erlang loss system with active breakdowns under bernoulli schedule [texte imprimé] / Zaiming Liu, Auteur ; Shan Gao, Auteur . - 2011 . - pp.433-438. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.433-438 Mots-clés : Erlang  loss  system  Unreliable  server  Bernoulli  schedule  Supplementary  variable  technique Résumé : This paper deals with a discrete-time Erlang loss system, in which breakdowns occur randomly at any instant while the server is serving the customers. As soon as breakdown occurs, the server is sent to repair directly, the customer being served before server breakdown decides, with probability 1−q, to depart the system (impatient customer) and, with complementary probability q(0≤q≤1), to wait for the server to complete his remaining service (patient customer). Additionally, Bernoulli vacation schedule is introduced into this model: after completion of each repair without interrupted customer waiting there or after completion of service, the server either goes for a vacation with probability θ(0≤θ≤1) or may wait for serving the next customer with complementary probability 1 −θ. Firstly, we obtain the z-transforms of the probabilities of server state by using a new type discrete supplementary variable technique. Secondly, we present some performance measures of this model, such as the steady-state availability, failure frequency of the system, mean time to the first failure and the probabilities when the server is idle, busy, down or on vacation. Finally, some numerical examples show the influence of the parameters on some crucial performance characteristics of the system. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?161.html

A new multicriteria methodology based on analytic hierarchy process / Fabio De Felice in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.439-445 Titre : A new multicriteria methodology based on analytic hierarchy process : the “Expert” AHP Type de document : texte imprimé Auteurs : Fabio De Felice, Auteur ; Antonella Petrillo, Auteur Année de publication : 2011 Article en page(s) : pp.439-445 Note générale : Management Langues : Anglais (eng) Mots-clés : Analytic  hierarchy  process  Lay  out  MCDA  Management Résumé : Aim of the work is to illustrates the results of a study concerning the optimization of the layout of a manufacturing company through the proposal of a new decision-making multi-criterion methodology called “Expert” AHP based on the well known Analytic Hierarchy Process technique. The methodology proposed has been validated in the re-planning of the layout of an electromechanical company, in order to optimize the flow of the materials. We also illustrate the applicability of the resulting framework through a specific model proposed in the manufacturing company. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?162.html [article] A new multicriteria methodology based on analytic hierarchy process : the “Expert” AHP [texte imprimé] / Fabio De Felice, Auteur ; Antonella Petrillo, Auteur . - 2011 . - pp.439-445. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.439-445 Mots-clés : Analytic  hierarchy  process  Lay  out  MCDA  Management Résumé : Aim of the work is to illustrates the results of a study concerning the optimization of the layout of a manufacturing company through the proposal of a new decision-making multi-criterion methodology called “Expert” AHP based on the well known Analytic Hierarchy Process technique. The methodology proposed has been validated in the re-planning of the layout of an electromechanical company, in order to optimize the flow of the materials. We also illustrate the applicability of the resulting framework through a specific model proposed in the manufacturing company. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?162.html

Choice criteria for maintenance strategy in automotive industries / Mahesh Pophaley in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.446-452 Titre : Choice criteria for maintenance strategy in automotive industries Type de document : texte imprimé Auteurs : Mahesh Pophaley, Auteur ; R. K. Vyas, Auteur Année de publication : 2011 Article en page(s) : pp.446-452 Note générale : Management Langues : Anglais (eng) Mots-clés : Maintenance  cost  Corrective  maintenance  Regular  preventive  maintenance  Predictive  maintenance Résumé : In the automotive industry, it is thought that effective maintenance management will permit fast, cost-effective responses to unpredictable and ever-changing product demand and support rapid product launches. Continued pressure on companies to reduce costs and improve customer satisfaction has resulted in increasingly detailed examinations of maintenance strategies. A judiciously selected maintenance program can provide significant advantages in relation to quality, safety, availability and cost reduction in these plants. A wrong decision can lead to the failure of the maintenance program and consequent economic losses, as the setting up of these programs is a strategic decision. Therefore justification of any given maintenance strategy within an organisation must consider cost criteria. The purpose of this study is to select the apposite maintenance strategy based on the maintenance cost choice criteria to improve the availability of production equipments. Corrective maintenance, regular preventive maintenance and predictive maintenance costs are compared and the exponential law is used to represent reliability and evaluate maintenance costs. Further simple mathematical cost models are developed and presented to carry out the decision making in relation to the selection of the maintenance strategy. The conclusion that can be drawn from the study indicates that maintenance cost ratio is the governing factor in this aspect. The proposed method can be adapted to an industrial situation in a mass production factory like an automotive industry. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?163.html [article] Choice criteria for maintenance strategy in automotive industries [texte imprimé] / Mahesh Pophaley, Auteur ; R. K. Vyas, Auteur . - 2011 . - pp.446-452. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.446-452 Mots-clés : Maintenance  cost  Corrective  maintenance  Regular  preventive  maintenance  Predictive  maintenance Résumé : In the automotive industry, it is thought that effective maintenance management will permit fast, cost-effective responses to unpredictable and ever-changing product demand and support rapid product launches. Continued pressure on companies to reduce costs and improve customer satisfaction has resulted in increasingly detailed examinations of maintenance strategies. A judiciously selected maintenance program can provide significant advantages in relation to quality, safety, availability and cost reduction in these plants. A wrong decision can lead to the failure of the maintenance program and consequent economic losses, as the setting up of these programs is a strategic decision. Therefore justification of any given maintenance strategy within an organisation must consider cost criteria. The purpose of this study is to select the apposite maintenance strategy based on the maintenance cost choice criteria to improve the availability of production equipments. Corrective maintenance, regular preventive maintenance and predictive maintenance costs are compared and the exponential law is used to represent reliability and evaluate maintenance costs. Further simple mathematical cost models are developed and presented to carry out the decision making in relation to the selection of the maintenance strategy. The conclusion that can be drawn from the study indicates that maintenance cost ratio is the governing factor in this aspect. The proposed method can be adapted to an industrial situation in a mass production factory like an automotive industry. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?163.html

Effciency in technological networks, an approach from artificial neural networks / N. Arranz in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.453-460 Titre : Effciency in technological networks, an approach from artificial neural networks Type de document : texte imprimé Auteurs : N. Arranz, Auteur ; J. C. Fdez. de Arroyabe, Auteur Année de publication : 2011 Article en page(s) : pp.453-460 Note générale : Management Langues : Anglais (eng) Mots-clés : Technological  networks  Artificial  neural  networks  Cooperative  game  theory  Structural  efficiency  Conflict Résumé : This paper presents the application of the artificial neural network (ANN) to the study of efficiency in technological networks. Based on a survey of 350 experts, who belong to different European institutions that regularly participate in technological networks, we represent joint and individual performance depending on two structural factors -number and typology of partners. Findings suggest that the main source of inefficiencies in the network derives from the discrepancy in the partner's perception of network's results and from the partners' contribution to the project, both at individual and joint level. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?164.html [article] Effciency in technological networks, an approach from artificial neural networks [texte imprimé] / N. Arranz, Auteur ; J. C. Fdez. de Arroyabe, Auteur . - 2011 . - pp.453-460. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.453-460 Mots-clés : Technological  networks  Artificial  neural  networks  Cooperative  game  theory  Structural  efficiency  Conflict Résumé : This paper presents the application of the artificial neural network (ANN) to the study of efficiency in technological networks. Based on a survey of 350 experts, who belong to different European institutions that regularly participate in technological networks, we represent joint and individual performance depending on two structural factors -number and typology of partners. Findings suggest that the main source of inefficiencies in the network derives from the discrepancy in the partner's perception of network's results and from the partners' contribution to the project, both at individual and joint level. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?164.html

An interval number programming approach for bilevel linear programming problem / Samir A. Abass in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.461-464 Titre : An interval number programming approach for bilevel linear programming problem Type de document : texte imprimé Auteurs : Samir A. Abass, Auteur Année de publication : 2011 Article en page(s) : pp.461-464 Note générale : Management Langues : Anglais (eng) Mots-clés : Bilevel  programming  Interval  numbers Résumé : In this paper, we propose a mathematical formulation of bilevel linear programming problem to deal with an interval number programming approach. Bilevel linear programming problem is usually viewed as a problem with two decision makers at two different hierarchical levels. The upper-level decision maker, the leader, selects his or her decision vector first and the lower decision maker, the follower, selects his or her afterward based on the decisions of the upper level. In mathematical programming problem, the coefficients in the objective function and the constraint functions are always determined as crisp values. In practice, however, there are many decision situations where the objective functions and/or the constraints are uncertain to some degree. Over the last two decades, interval programming based on the interval analysis has been developed as a useful and simple method to deal with this type of uncertainty. The interval numbers will be in both of the objective function and the constraints. An Illustrative numerical example is provided to clarify the proposed approach. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?165.html [article] An interval number programming approach for bilevel linear programming problem [texte imprimé] / Samir A. Abass, Auteur . - 2011 . - pp.461-464. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.461-464 Mots-clés : Bilevel  programming  Interval  numbers Résumé : In this paper, we propose a mathematical formulation of bilevel linear programming problem to deal with an interval number programming approach. Bilevel linear programming problem is usually viewed as a problem with two decision makers at two different hierarchical levels. The upper-level decision maker, the leader, selects his or her decision vector first and the lower decision maker, the follower, selects his or her afterward based on the decisions of the upper level. In mathematical programming problem, the coefficients in the objective function and the constraint functions are always determined as crisp values. In practice, however, there are many decision situations where the objective functions and/or the constraints are uncertain to some degree. Over the last two decades, interval programming based on the interval analysis has been developed as a useful and simple method to deal with this type of uncertainty. The interval numbers will be in both of the objective function and the constraints. An Illustrative numerical example is provided to clarify the proposed approach. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?165.html

A stochastic EPLS model with random price sensitive demand / Monami Das Roy in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.465-472 Titre : A stochastic EPLS model with random price sensitive demand Type de document : texte imprimé Auteurs : Monami Das Roy, Auteur ; Shib Sankar Sana, Auteur ; Kripasindhu Chaudhuri, Auteur Année de publication : 2011 Article en page(s) : pp.465-472 Note générale : Management Langues : Anglais (eng) Mots-clés : Price-sensitive  demand  Shortage  Inventory  Random  sales  price Résumé : In real estate businesses, the price fluctuates due to the variation of a number of factors such as brokerage, inflation and time value of money etc. In this article we consider an stochastic EPLS (economic production lot size) model with price sensitive demand when the price is random in character. The model investigates a self manufacturing/finite replenishment rate with profit maximization problem for a single item over finite time horizon, allowing shortages. A general model is built up by taking production cost, holding cost, shortage cost and selling price into consideration. The general model is analyzed by considering three different distributions of selling price: uniform distribution, exponential distribution and linear distribution for showing the flexibility and utility of the model. Numerical examples are illustrated to test the proposed model. Sensitivity analysis is carried out. A comparative study between these three distributions has also been done DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?167.html [article] A stochastic EPLS model with random price sensitive demand [texte imprimé] / Monami Das Roy, Auteur ; Shib Sankar Sana, Auteur ; Kripasindhu Chaudhuri, Auteur . - 2011 . - pp.465-472. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.465-472 Mots-clés : Price-sensitive  demand  Shortage  Inventory  Random  sales  price Résumé : In real estate businesses, the price fluctuates due to the variation of a number of factors such as brokerage, inflation and time value of money etc. In this article we consider an stochastic EPLS (economic production lot size) model with price sensitive demand when the price is random in character. The model investigates a self manufacturing/finite replenishment rate with profit maximization problem for a single item over finite time horizon, allowing shortages. A general model is built up by taking production cost, holding cost, shortage cost and selling price into consideration. The general model is analyzed by considering three different distributions of selling price: uniform distribution, exponential distribution and linear distribution for showing the flexibility and utility of the model. Numerical examples are illustrated to test the proposed model. Sensitivity analysis is carried out. A comparative study between these three distributions has also been done DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?167.html

Market power and optimal contract in delegated portfolio management / Jiliang Sheng in International journal of management science and engineering management, Vol. 5 N° 6 (Décembre 2010) 

Public ISBD [article]  in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.473-480 Titre : Market power and optimal contract in delegated portfolio management Type de document : texte imprimé Auteurs : Jiliang Sheng, Auteur ; Jun Yang, Auteur Année de publication : 2011 Article en page(s) : pp.473-480 Note générale : Management Langues : Anglais (eng) Mots-clés : Private  information  Market  power  Delegated  portfolio  management  Incentive  contract  Effort  cost Résumé : This article studies the contracting problem between an investor and a professional portfolio manager who possesses market power. The optimal linear contract is obtained in a closed form. When the manager has market power the contract affects the effort level of the manager, which provides a solution to the “non-incentive” result in Stoughton (1993) [30]. The sharing ratio of the portfolio return increases with effort cost, suggesting that a manager with a higher effort cost should be awarded a larger fraction of the investment profit. The sharing ratio also increases with the risk aversion of the portfolio manager. The optimal contract can separate different types of managers since only those with low effort costs would accept a contract when the sharing ratio is given. These findings compliment and extend the results in Stoughton (1993) [30] in which the manager does not have market power. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?168.html [article] Market power and optimal contract in delegated portfolio management [texte imprimé] / Jiliang Sheng, Auteur ; Jun Yang, Auteur . - 2011 . - pp.473-480. Management Langues : Anglais (eng) in International journal of management science and engineering management > Vol. 5 N° 6 (Décembre 2010) . - pp.473-480 Mots-clés : Private  information  Market  power  Delegated  portfolio  management  Incentive  contract  Effort  cost Résumé : This article studies the contracting problem between an investor and a professional portfolio manager who possesses market power. The optimal linear contract is obtained in a closed form. When the manager has market power the contract affects the effort level of the manager, which provides a solution to the “non-incentive” result in Stoughton (1993) [30]. The sharing ratio of the portfolio return increases with effort cost, suggesting that a manager with a higher effort cost should be awarded a larger fraction of the investment profit. The sharing ratio also increases with the risk aversion of the portfolio manager. The optimal contract can separate different types of managers since only those with low effort costs would accept a contract when the sharing ratio is given. These findings compliment and extend the results in Stoughton (1993) [30] in which the manager does not have market power. DEWEY : 658 ISSN : 1750-9653 En ligne : http://www.ijmsem.org/OnlineJournal.do/?168.html

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