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A branch-price-and-cut approach for the Multi-Commodity two-echelon Distribution Problem
No full textNational audienc
A sequential approach for a multi-commodity two-echelon distribution problem
No full textInternational audienceWe address a Multi-Commodity two-echelon Distribution Problem (MC2DP) where three sets of stakeholders are involved: suppliers, distribution centers, and customers. Multiple commodities have to be sent from suppliers to customers, using multiple distribution centers for consolidation purposes. Commodities are collected from the suppliers and delivered to the distribution centers with direct trips, while a fleet of homogeneous vehicles distributes commodities to customers. Commodities are compatible, that is any vehicle can transport any set of commodities as long as its capacity is not exceeded. The goal is to minimize the total transportation cost from suppliers to customers. We present two sequential schemes based on the solution, in a different order, of a collection and a delivery subproblem. In both cases, the solution of the first subproblem determines the quantity of each commodity at each distribution center. The second subproblem takes this information as input. We also propose different strategies to guide the solution of the first subproblem in order to take into account the impact of its solution on the second subproblem. The proposed sequential heuristics are evaluated and compared both on randomly generated instances and on a case study related to a short and local fresh food supply chain. The results show the impact of problem characteristics on solution strategies
RSE et numérique : une vision francophone
No full textOuvrage réalisé par la communauté académique réunie au sein de l’association pour le développement de l’enseignement et de la recherche en responsabilité sociale (ADERSE).International audienceChacun observe désormais une double mutation du management :• l’engagement opérationnel dans la responsabilité sociale des entreprises (RSE) ;• une maîtrise progressive des innovations numériques.Ces phénomènes s’imposent dans le quotidien des managers avec le visage du plus ancien des dieux romains: Janus le maître de la transformation. C’est pourquoi au cœur des crises, l’ADERSE a mobilisé une forte équipe de 33 chercheurs pluridisciplinaires pour dessiner les voies qui nous conduisent des conflits et contradictions à la conception et mise en œuvre de stratégies socialement responsables, pour une maîtrise du numérique selon une vision francophone qui est une constante historique de Lamartine à F. Perroux : « le dialogue au-delà de l’échange des objets ». Un parcours en trois étapes :• Que nous dit le terrain ?• Les impacts de la technique sur le social.• La RSE, une régulation pour le numérique.Avec la préface de V. Zardet (Past-Présidente de l’ADERSE) s’ouvre un inventaire structuré des réponses à cette somme de défis dont J.-M. Peretti brosse très concrètement les enjeux, les péripéties et les impacts sociétaux. L’articulation des approches successivement empiriques, analytiques et théoriques conduit le lecteur au diagnostic proposé par V. Fernandez et L. Draetta (co-directrices de la chaire Identité Numérique Responsable de l’Institut Polytechnique de Télécom Paris) : avec la RSE pour une éthique du numérique.Cet ouvrage est destiné à une large communauté : étudiants des universités et des grandes écoles, aux enseignants-chercheurs, aux techniciens experts, consultants, aux dirigeants et cadres des entreprises et plus globalement au citoyen curieux de mieux comprendre son époque
Entrepreneurial Ecosystems As Amplifiers of The Lean Startup Philosophy – Management Control Practices In Earliest-Stage Startups
No full textEntrepreneurial ecosystems play a key role in the development of startups by not only providing support – such as flexible office space and access to skilled employees, mentors and investors – but moreover by promoting concrete ideals about ‘good’ entrepreneurship. In our empirical analysis of management control systems (MCSs) in earliest-stage startups, we witness a strong influence of such ideals – above all the Lean Startup philosophy – on the MCSs analyzed. Building on cross-sectional field study data resulting from a comprehensive field-immersion strategy and 50 interviews with key actors in an entrepreneurial ecosystem as well as with founder-managers of startups, we consider the entrepreneurial ecosystem as a collective meso-level community that mediates between macro-level institutional pressures and micro-level practices of startups. We show how this community – through a variety of what we term amplifying mechanisms – not only actively deinstitutionalizes a legacy entrepreneurial philosophy epitomized by the business plan concept but propagates the Lean Startup philosophy so that this alternative has become the dominant institutional philosophy in the studied ecosystem and its startups. Due to the amplifying mechanisms exerted by the meso-level, startups use MCSs that play a crucial role in the rapid experimentation and learning process towards finding a scalable business model that is characteristic of the Lean Startup philosophy. We theorize this role of MCSs through the lenses of interactive and enabling control systems and make these concepts amenable to multi-level entrepreneurial settings
A pickup and delivery problem with a fleet of electric vehicles and a local energy production unit
No full textInternational audienc
Du contrôle à l'enquête, d'une vision hétéronome à une vision autonome de l'activité
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Rank-Dependent Utility Under Multiple Priors
No full textInternational audienceNonlinear perception of risk is integrated into models of decision under ambiguity, thereby providing a theoretical basis for behavioral analyses that involve both risk and ambiguity. The main model replaces the risk front of maxmin expected utility by rank-dependent utility, and it is derived from simple, observable axioms that are not restricted to expected utility under risk. The model highlights the interaction between risk attitude and ambiguity attitude, and it is compatible with the paradoxical choices hypothesized by Machina. Following the same idea, nonlinear perception of risk can also be integrated into variational and multiplier preferences. When applied to comparative ambiguity attitudes, the idea enables more comparisons by allowing for both heterogeneous taste and perception of risk
On the Impact of Public Housing on Income Segregation in France
No full textInternational audienceThis article provides a geographic analysis of the contribution of public housing to income segregation in France from 1999 to 2015. The analysis is conducted with several segregation indices and at different geographic scales. Surprisingly, it appears that while home tenure (public vs. private housing) segregation has been decreasing, income segregation has been rising. With segregation decomposition techniques, we provide evidence that this is partly due to an increasing concentration of low-income households in public housing, which cancels out the effect of the spatial dispersion of public housing. Indeed, while public housing has become more homogeneously distributed geographically, which should help to reduce income segregation, the distribution of income within public (and private) housing has changed: households living in public housing were poorer in 2015 than in 1999. We also provide evidence of a sorting effect—the process of allocating public housing that is not random—so that the richest neighborhoods or municipalities receive wealthier-than-average public tenants
Entrepreneurship Education at the Crossroads: Challenging Taken-for-Granted Assumptions and Opening New Perspectives
No full textInternational audienceThis work presents a synthesis of a debate regarding taken-for-granted assumptions and challenges in entrepreneurship education, matured after a developmental workshop organized to increase the research salience of the field. From the five contributions selected, three challenges emerge. The first is recognizing that participants’ representations about entrepreneurship play a crucial role in defining goals and impact of entrepreneurship education; second, integrating new perspectives of conceiving entrepreneurship into the current models of teaching entrepreneurship; and, lastly, facilitating the integration of entrepreneurship knowledge into practice. These challenges opened up to a conception of entrepreneurship education as a dynamic concept reflecting personal values, societal changes, and cultural differences. As a result, learning places of entrepreneurship education promotes exploration and not adaptation to existing schemes, where personal models for practicing entrepreneurship have room to emerge. Defining knowledge priorities, instead of targeting knowledge exhaustiveness, becomes of greatest importance to make entrepreneurship education‘s impact more relevant