A Contraction-free and Cut-free Sequent Calculus for Propositional Dynamic Logic

B. HILL, F. Poggiolesi

Studia Logica

2010, vol. 94, n°1, pp.1-26

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

A Geometric Proof of Calibration

G. STOLTZ, S. Mannor

Mathematics of Operations Research

novembre 2010, vol. 35, n°4, pp.721-727

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

Mots clés : Calibration, Approachability, Convergence rates, Computational complexity

We provide yet another proof of the existence of calibrated forecasters; it has two merits. First, it is valid for an arbitrary finite number of outcomes. Second, it is short and simple and it follows from a direct application of Blackwell's approachability theorem to a carefully chosen vector-valued payoff function and convex target set. Our proof captures the essence of existing proofs based on approachability (e.g., the proof by Foster [Foster, D. 1999. A proof of calibration via Blackwell's approachability theorem. Games Econom. Behav. 29 73–78] in the case of binary outcomes) and highlights the intrinsic connection between approachability and calibration

A gestão estratégica dos hospitais na França: balanço e perspectivas


Ciência & Saúde Coletiva

août 2010, vol. 15, n°5, pp.2285-2296

Départements : Stratégie et Politique d’Entreprise

The strategic management was introduced in French hospitals in the late 80s, in a context of inefficiency and the need to control healthcare expenditure. This concept has inspired a series of government reforms, the organization and dynamics of hospitals and the mode of regulating the French health system, assuming a real change of professional culture. The changes in the economic context and in the finance of hospitals, the behavior of users, the population aging, the development of chronic diseases and increased competition, are the new challenges to be faced. The involvement of stakeholders is crucial and the strategic management, based on mobilizing these actors, is today, a method of administration particularly well adapted to the health area. This article aims to present the impact of the concept of strategic management in the evolution of French hospitals and the consequences of these developments on the outlook for the dissemination of strategic management in the health sector. To do so, it is examined the evolution of the French context until 2010, the new challenges that French hospitals must face and, finally, the consequences of these challenges on how to design services, manage the relationships between the actors of the health system and organize the operational functioning of hospitals.Strategic management; Hospital management; Organizational change; Networks of co-ordinated care; Patient's journey A gestão estratégica é introduzida nos hospitais franceses no final da década de oitenta, num contexto de ineficácia e necessidade de controle das despesas de saúde. Este conceito tem inspirado uma série de reformas do governo, da organização e da dinâmica dos hospitais e do modo de regulação do sistema de saúde francês, pressupondo uma verdadeira mudança da cultura profissional. As mudanças no contexto econômico e no modo de financiamento dos hospitais, no comportamento dos usuários, o envelhecimento da população, o desenvolvimento das patologias crônicas e a intensificação da concorrência, constituem novos desafios a serem enfrentados. O envolvimento dos atores é fundamental e a gestão estratégica, baseada na mobilização dos atores, torna-se, hoje, um modo de administração particularmente adaptado à área da saúde. Este artigo tem por objetivo apresentar o impacto do conceito de gestão estratégica na evolução do meio hospitalar francês e as consequências desta evolução sobre as perspectivas de difusão da gestão estratégica no setor da saúde. Para isso, examina-se a evolução do contexto francês até 2010, os novos desafios que os hospitais franceses devem enfrentar e, por fim, as consequências destes desafios sobre a maneira de conceber os serviços, de administrar as relações entre os atores do sistema de saúde e de organizar o funcionamento operacional dos hospitais. Palavras-chave: Gestão estratégica, Gestão hospitalar, Mudança organizacional, Redes de cuidados coordenados, Percurso do paciente

A longitudinal study of the influence of alliance network structure and composition on firm exploratory innovation


Academy of Management Journal

août 2010, vol. 53, n°4, pp.890-913

Départements : Stratégie et Politique d’Entreprise

This study examines the influence of the structure and composition of a firm's alliance network on its exploratory innovation--innovation embodying knowledge that is novel relative to the firm's extant knowledge. A longitudinal investigation of 77 telecommunications equipment manufacturers indicated that the technological diversity of a firm's alliance partners increases its exploratory innovation. Further, network density among a firm's alliance partners strengthens the influence of diversity. These results suggest the benefits of network "closure" (wherein a firm's partners are also partners) and access to diverse information can coexist in an alliance network and that these combined benefits increase exploratory innovation

A Model of Financial Market Liquidity Based on Intermediary Capital


Journal of the European Economic Association

avril-mai 2010, vol. 8, n°2-3, pp.456-466

Départements : Finance, GREGHEC (CNRS)

A Note on the Evaluation of Information in Zero-Sum Repeated Games


Journal of Mathematical Economics

juillet 2010, vol. 46, n°4, pp. 393–399

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

Mots clés : Repeated games, Zero-sum games, Value-of-information

Two players play a zero-sum repeated game with incomplete information. Before the game starts one player receives a private signal that depends on the realized state of nature. The rules that govern the choice of the signal are determined by the information structure of the game. Different information structures induce different values. The value-of-information function of a game associates every information structure with the value it induces. We characterize those functions that are value-of-information functions for some zero-sum repeated game with incomplete information

A Pattern-Based Approach to Protocol Mediation for Web Service Composition


Information and Software Technology

2010, vol. 52, n°3, pp.304-323

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

A Social Movement Perspective on Finance: How Socially Responsible Investment Mattered


Journal of Business Ethics

avril 2010, vol. 92, pp.57-78

Départements : Comptabilité et Contrôle de Gestion

Mots clés : Framing, France, Institutional change, Organizational field, Social movements, Socially Responsible Investment (SRI)

This study discusses how social movements can influence economic systems. Employing a political'cultural approach to markets, it purports that 'compromise movements' can help change existing institutions by proposing new ones. This study argues in favor of the role of social movements in reforming economic institutions. More precisely, Socially Responsible Investment (SRI) movements can help bring SRI concerns into financial institutions. A study of how the French SRI movement has been able to change entrenched institutional logics of the French asset management sector provides wide-ranging support for these arguments. Empirical findings are drawn from a longitudinal case study (1997'2009), based on participative observation, interviews and documentary evidence. Implications for research on social movements, institutional change and SRI are outlined. Lastly, the study provides practitioners with some theoretical keys to understand the pros and cons of 'SRI labels'.

Acceptance of uncertainty as an indicator of effective leadership


Consulting Psychology Journal: Practice & Research

automne 2010, vol. 62, n°2, pp.94-104

Accounting and Strategising: A Case Study from New Product Development

B. Jørgensen, M. MESSNER

Accounting Organizations and Society

février 2010, vol. 35, n°2

Départements : Comptabilité et Contrôle de Gestion

Abstract: This paper explores the relationship between accounting and strategy in a context that is characterized by pluralistic demands and high uncertainty about outcomes. By way of an ethnographic field study in an R&D intensive company, we analyze new product development (NPD) projects and the way in which decisions and practices concerning these projects are accounted for. Building upon a practice theory perspective, we find that actors account for the appropriateness of NPD practices not only or primarily on the basis of accounting information, but also by "strategising", i.e. by mobilizing different strategic objectives to which these practices are supposed to contribute. We argue that this has to do with the ambiguous demands on NPD and the limits of calculability inherent in NPD design decisions. At the same time, accounting information is not necessarily irrelevant in such a case; it can enter the picture as a general understanding that guides actors' strategising efforts by reminding them of the ultimate importance of financial numbers. Keywords: management accounting, strategising, new product development, practice theory, accountability