A Queuing Framework for Routing Problems with Time-dependent Travel Times

H. Peremans, T. Van Woensel, N. Vandaele, L. KERBACHE

Journal of Mathematical Modelling and Algorithms

mars 2007, vol. 6, n°1, pp.151-173

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

Transportation is an important component of supply chain competitiveness since it plays a major role in the inbound, inter-facility, and outbound logistics. In this context, assigning and scheduling vehicle routing is a crucial management problem. Despite the existence of numerous publications dealing with efficient scheduling methods for vehicle routing, very few address the inherent stochastic nature of this problem. In this paper, a novel framework for modelling routing problems with time-dependent travel times due to potential traffic congestion is considered. The approach developed introduces mainly the traffic congestion component modelled through a queueing mode!. Standard test problems are used for illustrative purposes as well as for a discussion on the feasibility of proposed solutions if travel times are not constantKey words time-dependent routing problems - queueing - dynamic travel times

Automatic Formulation of Stochastic Programs Via an Algebraic Modeling Language

J. Thénié, C. VAN DELFT, J. Vial

Computational Management Science

janvier 2007, vol. 4, n°1, pp.17-40

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

Mots clés : Stochastic programming, Algebraic modeling language, Deterministic equivalent

This paper presents an open source tool that automatically generates the so-called deterministic equivalent in stochastic programming. The tool is based on the algebraic modeling language ampl. The user is only required to provide the deterministic version of the stochastic problem and the information on the stochastic process, either as scenarios or as a transitions-based event tree

E-Government Payoffs: Evidence from Cross- Country Data


Journal of Global Information Management

2007, vol. 15, n°4, pp.20-40

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

Mots clés : Business competitiveness, e-government, Government efficiency, IT impact, Reduction of social divide, Secondary data

Using secondary data from 99 countries and IT impact literature as the guiding theoretical perspective; we examine the payoffs from e-government in the form of national performance. We do this by initially examining the relationship of e-government development with the first order government process efficiency parameters (resource spending efficiency and administrative process efficiency). Subsequently we examine the association of these first order efficiency outcomes with the two second order dimensions of national performance (reduction of social divide and business competitiveness). Our analysis reveals significant association of ‘e-government development’ with both the first order ‘government efficiency parameters’. Further analysis reveals significant relationships of ‘government efficiency parameters’ with thedimensions of ‘national performance’. Important role of ‘national business competitiveness’ in the reduction of ‘social divide’ is brought forth through post-hoc analysis. Through this research, we make some important contributions which have implications for researchers, practitioners, public administrators, and policy makers

Facility Reliability Issues in Network p-Median Problems: Strategic Centralization and Co-location Effects

M. MENEZES, O. Berman, D. Krass

Operations Research

mars-avril 2007, vol. 55, n°2, pp.332-350

Départements : Informations Systems and Operations Management

In this paper we analyze a facility location model where facilities may be subject to disruptions, causing customers to seek service from the operating facilities. We generalize the classical p-Median problem on a network to explicitly include the failure probabilities, and analyze structural and algorithmic aspects of the resulting model. The optimal location patterns are seen to be strongly dependent on the probability of facility failure - with facilities becoming more centralized, or even co-located, as the failure probability grows. Several exact and heuristic solution approaches are developed. Extensive numerical computations are performed

Favoriser l'innovation radicale dans une entreprise multidivisionnelle. Discussion du modèle ambidextre à partir de l'analyse d'un cas

S. BEN MAHMOUD-JOUINI, F. Charue-Duboc, F. Fourcade

Finance - Contrôle - Stratégie

septembre 2007, vol. 10, n°3, pp.5-41

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

Le modèle d'organisation ambidextre constitue l'une des réponses avancées par la littérature pour développer des innovations radicales dans les grandes entreprises. Il met en avant la coexistence d'unités dédiées à l'exploration et d'autres à l'exploration et au développement de ces innovations. L'articulation de ces unités, à la fois séparées et intégrées. a été peu étudiée. Sur la. base d'une étude longitudinale d'une nouvelle unité organisationnelle créée pour favoriser l'innovation dans une grande entreprise multidivisionnelle, nous caractérisons plusieurs modes d'intégration situés à des niveaux différents ct fondés sur des mécanismes variés.

Fostering IT-enabled Business Innovation at YCH Group

T. S. H. Teo, C. Ranganathan, S. C. SRIVASTAVA, J. W. K. Loo

MIS Quarterly Executive

2007, vol. 6, n°4, pp.211-223

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

As the business environment becomes more global and competitive, organizations need to pay more managerial attention to systematically encouraging business innovation. Singapore-based YCH Group, a leader in end-to-end supply chain solutions in the Asia-Pacific region, has addressed the issue of stimulating business innovation. This article describes its experiences and offers three lessons for encouraging IT-based innovation. The first lesson is to foster an innovation mindset, which YCH has done by creating an IT-centric innovation mindset and by balancing strategic and operational issues. The second is to build partnerships, which YCH has achieved by developing an outward-facing IT organization, by leveraging cross-learning from alliances, and by leveraging IT to capitalize on opportunities to grow with customers. The third lesson is to mitigate risks and uncertainty, which YCH has done by instilling a flexible risk ethic, by focusing on customer value when assessing its innovation projects, and by paying attention to protecting intellectual property.

Information Systems (IS) Discipline Identity: A Review and Framework


Communications of the AIS

novembre 2007, vol. 20, n°33, pp.518-544

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

The recent debate about crisis in the Information Systems (IS) discipline is largely attributed to its having a fluid discipline identity. Myriad conceptualizations of IS discipline identity have resulted in a plethora of unstructured and disconnected recommendations for the survival and growth of the IS field. It is therefore essential to have a theoretical framework which explains: What is IS discipline identity? In this study, we address this void in the identity literature. By extending and borrowing from the concepts of organizational and self-identity, we propose a theoretical framework for discipline identity and explicate its dimensions with respect to the IS discipline. The three contextual questions of discipline identity about purpose, period, and place set the stage for an in-depth inquiry of the three constitutive questions (or dimensions): periphery, perspective, and process, to provide a holistic framework for conceptualizing IS discipline identity. Further, we conceptualize IS discipline identity process as consisting of four recursive and iterative sub-processes: copy, consolidate, differentiate, and demonstrate (CCDD). We posit that an iterative hermeneutic focus on these four sub-processes is vital for the health of the discipline and neglecting even one of them will lead to an imbalanced identity structure. Through this paper, we seek to stimulate and further the ongoing debate on the topic

Inventory, Speculation, and Sourcing Strategies in the Presence of Online Exchanges


Manufacturing & Service Operations Management

Summer 2007, vol. 9, n°3

Départements : Informations Systems and Operations Management

Locating Capacitated Facilities to Maximize Captured Demand

O. Berman, R. Huang, S. Kim, M. MENEZES


novembre 2007, vol. 39, n°11, pp.1015-1029

Départements : Informations Systems and Operations Management

Mots clés : Location, Congestion, Optimization, Queueing

We consider the problem of locating a set of facilities on a network to maximize the expected number of captured demand when customer demands are stochastic and congestion exists at facilities. Customers travel to their closest facility to obtain service. If the facility is full (no more space in the waiting room), they attempt to obtain service from the next-closest facility not yet visited from its current position on the network. A customer is lost either when the closest facility is located too far away or all facilities have been visited. After formulating the model, we propose two heuristic procedures. We combine the heuristics with an iterative calibration scheme to estimate the expected demand rate faced by the facilities: this is required for evaluating objective function values. Extensive computational results are presented

Modernization of Passenger Reservation System: Indian Railway's Dilemma

S. C. SRIVASTAVA, S. S. Mathur, T. S. H. Teo

Journal of Information Technology

décembre 2007, vol. 22, n°4, pp.432-439

Départements : Informations Systems and Operations Management, GREGHEC (CNRS)

Mots clés : Railways, Government, Technology change, Legacy system, Flexibility, Customer, Railroad, India

This teaching case discusses the challenges being faced by the technology managers at Indian Railways (IR) in the current scenario of a resurgent national economy coupled with increasing customer expectations. In the face of growing competition from road and low-cost airlines, to retain its customers, IR has responded by changing its business rules. The Railway Ministry expects a rapid response from Centre for Railway Information Systems (CRIS) to incorporate all these changes in the passenger reservation system (PRS). The old PRS, which is time-tested and reliable, and has been serving the customers' needs for nearly two decades, is now proving to be relatively inflexible to match the rapidly changing business requirements. Although the current scenario of a constant need to change the programming logic of PRS has been making maintenance tougher for CRIS officials, they have realized that PRS is a time-tested, proven, and reliable technology. Though they would be happy to replace the old PRS with a new state-of-art system that would provide them greater maintenance flexibility, the repercussions associated with possible failure of the new system are far too serious. The case exhibits the current dilemma being faced by the head of CRIS, the umbrella agency for information technology (IT) implementation in IR: whether IR should continue using the old PRS technology with its inherent shortcomings, or should it take the risk and go in for a wholesale replacement with a new state-of-art technology which would provide greater maintenance flexibility