Documents disponibles écrits par cet auteur

Consumption externality and yield uncertainty in the influenza vaccine supply chain / Kenan Arifoglu in Management science, Vol. 58 N° 6 (Juin 2012) 

Public ISBD [article]  in Management science > Vol. 58 N° 6 (Juin 2012) . - pp.1072-1091 Titre : Consumption externality and yield uncertainty in the influenza vaccine supply chain : Interventions in demand and supply sides Type de document : texte imprimé Auteurs : Kenan Arifoglu, Auteur ; Sarang Deo, Auteur ; Seyed M. R. Iravani, Auteur Année de publication : 2012 Article en page(s) : pp.1072-1091 Note générale : Management Langues : Anglais (eng) Mots-clés : Influenza  vaccine  Supply  chain  inefficiency  Strategic  consumer  behavior  Externality  Yield  uncertainty Résumé : We study the impact of yield uncertainty (supply side) and self-interested consumers (demand side) on the inefficiency in the influenza vaccine supply chain. Previous economic studies, focusing on demand side, find that the equilibrium demand is always less than the socially optimal demand because self-interested individuals do not internalize the social benefit of protecting others via reduced infectiousness (positive externality). In contrast, we show that the equilibrium demand can be greater than the socially optimal demand after accounting for the limited supply due to yield uncertainty and manufacturer's incentives. The main driver for this result is a second (negative) externality: Self-interested individuals ignore that vaccinating people with high infection costs is more beneficial for the society when supply is limited. We show that the extent of the negative externality can be reduced through more efficient and less uncertain allocation mechanisms. To investigate the relative effectiveness of government interventions on supply and demand sides under various demand and supply characteristics, we construct two partially centralized scenarios where the social planner (i.e., government) intervenes either on the demand side or the supply side, but not both. We conduct an extensive numerical analysis. ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/58/6/1072.short [article] Consumption externality and yield uncertainty in the influenza vaccine supply chain : Interventions in demand and supply sides [texte imprimé] / Kenan Arifoglu, Auteur ; Sarang Deo, Auteur ; Seyed M. R. Iravani, Auteur . - 2012 . - pp.1072-1091. Management Langues : Anglais (eng) in Management science > Vol. 58 N° 6 (Juin 2012) . - pp.1072-1091 Mots-clés : Influenza  vaccine  Supply  chain  inefficiency  Strategic  consumer  behavior  Externality  Yield  uncertainty Résumé : We study the impact of yield uncertainty (supply side) and self-interested consumers (demand side) on the inefficiency in the influenza vaccine supply chain. Previous economic studies, focusing on demand side, find that the equilibrium demand is always less than the socially optimal demand because self-interested individuals do not internalize the social benefit of protecting others via reduced infectiousness (positive externality). In contrast, we show that the equilibrium demand can be greater than the socially optimal demand after accounting for the limited supply due to yield uncertainty and manufacturer's incentives. The main driver for this result is a second (negative) externality: Self-interested individuals ignore that vaccinating people with high infection costs is more beneficial for the society when supply is limited. We show that the extent of the negative externality can be reduced through more efficient and less uncertain allocation mechanisms. To investigate the relative effectiveness of government interventions on supply and demand sides under various demand and supply characteristics, we construct two partially centralized scenarios where the social planner (i.e., government) intervenes either on the demand side or the supply side, but not both. We conduct an extensive numerical analysis. ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/58/6/1072.short

The impact of misalignment of organizational structure and product architecture on quality in complex product development / Bilal Gokpinar in Management science, Vol. 56 N° 3 (Mars 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 3 (Mars 2010) . - pp. 468-484 Titre : The impact of misalignment of organizational structure and product architecture on quality in complex product development Type de document : texte imprimé Auteurs : Bilal Gokpinar, Auteur ; Wallace J. Hopp, Auteur ; Seyed M. R. Iravani, Auteur Année de publication : 2010 Article en page(s) : pp. 468-484 Note générale : Management Langues : Anglais (eng) Mots-clés : New  product  development  Product  architecture  Organizational  structure  Complex  networks Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Product architecture and organizational communication play significant roles in complex product development efforts. By using networks to characterize both product structure and communication patterns, we examine the impact of mismatches between these on new product development (NPD) performance. Specifically, we study the vehicle development process of a major auto company and use vehicle quality (warranty repairs) as our NPD performance metric. Our empirical results indicate that centrality in a product architecture network is related to quality according to an inverted-U relationship, which suggests that vehicle subsystems of intermediate complexity exhibit abnormally high levels of quality problems. To identify specific subsystems in danger of excessive quality problems, we characterize mismatches between product architecture and organizational structure by defining a new metric, called coordination deficit, and show that it is positively associated with quality problems. These results deepen our understanding of the impact of organizational structure and product architecture on the NPD process and provide tools with which managers can diagnose and improve their NPD systems. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/3.toc [article] The impact of misalignment of organizational structure and product architecture on quality in complex product development [texte imprimé] / Bilal Gokpinar, Auteur ; Wallace J. Hopp, Auteur ; Seyed M. R. Iravani, Auteur . - 2010 . - pp. 468-484. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 3 (Mars 2010) . - pp. 468-484 Mots-clés : New  product  development  Product  architecture  Organizational  structure  Complex  networks Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Product architecture and organizational communication play significant roles in complex product development efforts. By using networks to characterize both product structure and communication patterns, we examine the impact of mismatches between these on new product development (NPD) performance. Specifically, we study the vehicle development process of a major auto company and use vehicle quality (warranty repairs) as our NPD performance metric. Our empirical results indicate that centrality in a product architecture network is related to quality according to an inverted-U relationship, which suggests that vehicle subsystems of intermediate complexity exhibit abnormally high levels of quality problems. To identify specific subsystems in danger of excessive quality problems, we characterize mismatches between product architecture and organizational structure by defining a new metric, called coordination deficit, and show that it is positively associated with quality problems. These results deepen our understanding of the impact of organizational structure and product architecture on the NPD process and provide tools with which managers can diagnose and improve their NPD systems. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/3.toc

Vertical flexibility in supply chains / Wallace J. Hopp in Management science, Vol. 56 N° 3 (Mars 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 3 (Mars 2010) . - pp. 495-502 Titre : Vertical flexibility in supply chains Type de document : texte imprimé Auteurs : Wallace J. Hopp, Auteur ; Seyed M. R. Iravani, Auteur ; Wendy Lu Xu, Auteur Année de publication : 2010 Article en page(s) : pp. 495-502 Note générale : Management Langues : Anglais (eng) Mots-clés : Supply  chain  Flexibility  Capacity  investment Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Jordan and Graves (Jordan, W. C., S. C. Graves. 1995. Principles on the benefits of manufacturing process flexibility. Management Sci. 41(4) 577–594) initiated a stream of research on supply chain flexibility, which was furthered by Graves and Tomlin (Graves, S. C., B. T. Tomlin. 2003. Process flexibility in supply chains. Management Sci. 49(7) 907–919), that examined various structures for achieving horizontal flexibility within a single level of a supply chain. In this paper, we extend the theory of supply chain flexibility by considering placement of vertical flexibility across multiple stages in a supply chain. Specifically, we consider two types of flexibility—logistics flexibility and process flexibility—and examine how demand, production, and supply variability at a single stage impacts the best stage in the supply chain for each type of flexibility. Under the assumptions that margins are the same regardless of flexibility location, capacity investment costs are the same within and across stages, and flexibility is limited to a single stage of logistics (process) flexibility accompanied with necessary process (logistics) flexibility, we show that both types of flexibility are most effective when positioned directly at the source of variability. However, although expected profit increases as logistics flexibility is positioned closer to the source of variability (i.e., downstream for demand variability and upstream for supply variability), locating process flexibility anywhere except at the stage with variability leads to the same decrease in expected profit. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/3.toc [article] Vertical flexibility in supply chains [texte imprimé] / Wallace J. Hopp, Auteur ; Seyed M. R. Iravani, Auteur ; Wendy Lu Xu, Auteur . - 2010 . - pp. 495-502. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 3 (Mars 2010) . - pp. 495-502 Mots-clés : Supply  chain  Flexibility  Capacity  investment Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Jordan and Graves (Jordan, W. C., S. C. Graves. 1995. Principles on the benefits of manufacturing process flexibility. Management Sci. 41(4) 577–594) initiated a stream of research on supply chain flexibility, which was furthered by Graves and Tomlin (Graves, S. C., B. T. Tomlin. 2003. Process flexibility in supply chains. Management Sci. 49(7) 907–919), that examined various structures for achieving horizontal flexibility within a single level of a supply chain. In this paper, we extend the theory of supply chain flexibility by considering placement of vertical flexibility across multiple stages in a supply chain. Specifically, we consider two types of flexibility—logistics flexibility and process flexibility—and examine how demand, production, and supply variability at a single stage impacts the best stage in the supply chain for each type of flexibility. Under the assumptions that margins are the same regardless of flexibility location, capacity investment costs are the same within and across stages, and flexibility is limited to a single stage of logistics (process) flexibility accompanied with necessary process (logistics) flexibility, we show that both types of flexibility are most effective when positioned directly at the source of variability. However, although expected profit increases as logistics flexibility is positioned closer to the source of variability (i.e., downstream for demand variability and upstream for supply variability), locating process flexibility anywhere except at the stage with variability leads to the same decrease in expected profit. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/3.toc