2,411 research outputs found
The Distribution Function: at the Heart of managing Cultural-Product Industries
Cultural industries (music, publishing, movies, television) faced similar trends in recent years : growing importance of distribution, raising costs in promotion, concentrating demand on fewer products, restructuring value added chain. Internet was considered, at a given time, as a lever to promote diversity and to support an expanding creation ; on a contrary, its development contributed to increase concentration and give more importance to prescription and distribution portals. Our communication aims at analyzing precisely the role of distributors in the chain value of cultural industries : aggregating demand, prescribing cultural goods to consumers, contractor for producers. We study distribution comparing more specifically three models of cultural industries : book publishing, movie theaters and television. These models provide with a conceptual framework considering distribution as a network structure. They help to report trends at stake in cultural industries : mass distribution and dematerialization, transforming business models...distribution
The economics and business models of prescription in the Internet
L'Ă©conomie de l'Internet a contribuĂ© Ă une ouverture du jeu concurrentiel en dissociant les fonctions physique et informationnelle des activitĂ©s de distribution. Plus prĂ©cisĂ©ment, elle a ouvert la voie Ă de nouvelles structures de marchĂ© en mettant en avant une fonction de prescription clairement distincte des fonctions d'offre d'une part, des fonctions logistiques et de mise Ă disposition des biens d'autre part. Nous nous attachons ici Ă montrer que l'analyse des fonctions et modalitĂ©s de prescription permet de mieux comprendre les modĂšles d'affaires et les structures concurrentielles Ă l'Ćuvre dans l'Ă©conomie de l'Internet organisĂ©es autour de l'articulationde trois marchĂ©s : biens primaires, rĂ©fĂ©rencement, prescription. Cette modĂ©lisation de marchĂ©s Ă prescription contribue Ă enrichir la comprĂ©hension des chaĂźnes de valeur et des relations d'affaires repĂ©rables dans l'Internet.prescription;internet
Constraints on Light Dark Matter From Core-Collapse Supernovae
We show that light ( 1 -- 30 MeV) dark matter particles can play a
significant role in core-collapse supernovae, if they have relatively large
annihilation and scattering cross sections, as compared to neutrinos. We find
that if such particles are lighter than 10 MeV and reproduce the
observed dark matter relic density, supernovae would cool on a much longer time
scale and would emit neutrinos with significantly smaller energies than in the
standard scenario, in disagreement with observations. This constraint may be
avoided, however, in certain situations for which the neutrino--dark matter
scattering cross sections remain comparatively small.Comment: 4 pages, 1 figur
Percolation on uniform infinite planar maps
We construct the uniform infinite planar map (UIPM), obtained as the n \to
\infty local limit of planar maps with n edges, chosen uniformly at random. We
then describe how the UIPM can be sampled using a "peeling" process, in a
similar way as for uniform triangulations. This process allows us to prove that
for bond and site percolation on the UIPM, the percolation thresholds are
p_c^bond=1/2 and p_c^site=2/3 respectively. This method also works for other
classes of random infinite planar maps, and we show in particular that for bond
percolation on the uniform infinite planar quadrangulation, the percolation
threshold is p_c^bond=1/3.Comment: 26 pages, 9 figure
Usages et reprĂ©sentations de la punition : Ă©tude de cas au sein dâun lycĂ©e gĂ©nĂ©ral et technologique de la proche banlieue toulousaine
La question que nous nous posons, de maniĂšre primordiale, est celle des finalitĂ©s de la punition et du rapport aux normes scolaires entretenu par les enseignants. Quelles sont les stratĂ©gies mises en place pour punir moins ? Pour punir mieux ? Pour Ă©viter de punir ? Et plus globalement : comment la punition sâinscrit-elle dans le cadre de la gestion de la classe par lâenseignant ?Pour rĂ©pondre Ă ces questions le choix a Ă©tĂ© fait de privilĂ©gier une approche dite «pragmatique» en sociologie.Afin de mieux saisir les fonctions et finalitĂ©s des punitions dans les lycĂ©es aujourdâhui et pour mieux cerner les diffĂ©rentes configurations dâassujettissement pensĂ©es par les enseignants, nous allons nous pencher sur la gestion de classe dans le cadre dâun style dâenseignement particulier, sur les modalitĂ©s dâintervention qui sont privilĂ©giĂ©es par les acteurs, puis dans un second temps il sera question de la punition telle que se la reprĂ©sentent les enquĂȘtĂ©s, en pointant aussi ses limites et son caractĂšre potentiellement contre-productif
Short-time asymptotics for marginal distributions of semimartingales
We study the short-time asymptotics of conditional expectations of smooth and
non-smooth functions of a (discontinuous) Ito semimartingale; we compute the
leading term in the asymptotics in terms of the local characteristics of the
semimartingale. We derive in particular the asymptotic behavior of call options
with short maturity in a semimartingale model: whereas the behavior of
\textit{out-of-the-money} options is found to be linear in time, the short time
asymptotics of \textit{at-the-money} options is shown to depend on the fine
structure of the semimartingale
The Distribution Function: at the Heart of managing Cultural-Product Industries
Cultural industries (music, publishing, movies, television) faced similar trends in recent years : growing importance of distribution, raising costs in promotion, concentrating demand on fewer products, restructuring value added chain. Internet was considered, at a given time, as a lever to promote diversity and to support an expanding creation ; on a contrary, its development contributed to increase concentration and give more importance to prescription and distribution portals. Our communication aims at analyzing precisely the role of distributors in the chain value of cultural industries : aggregating demand, prescribing cultural goods to consumers, contractor for producers. We study distribution comparing more specifically three models of cultural industries : book publishing, movie theaters and television. These models provide with a conceptual framework considering distribution as a network structure. They help to report trends at stake in cultural industries : mass distribution and dematerialization, transforming business models...Les industries culturelles (Ă©ditions phonographique, littĂ©raire et audiovisuelle) sont frappĂ©es depuis plusieurs annĂ©es par des mouvements convergents : montĂ©e en puissance des diffuseurs, dĂ©veloppement de la mĂ©diatisation et des dĂ©penses publicitaires, concentration de la consommation sur un nombre d'Ćuvres de plus en plus restreint, transformation des chaĂźnes de valeur. Alors qu'Internet Ă©tait envisagĂ©, Ă un moment, comme un facteur de diversitĂ© et d'ouverture de la crĂ©ation, il s'est vite avĂ©rĂ© que son dĂ©veloppement a au contraire contribuĂ© Ă accentuer la concentration autour de sites prescripteurs, en dĂ©stabilisant les Ă©diteurs (cf. Benghozi, Paris, 2002). L'objet de cette communication est d'analyser plus prĂ©cisĂ©ment le rĂŽle des distributeurs dans les chaĂźnes de valeur des industries culturelles : agrĂ©gateurs de la demande, prescripteurs des consommateurs, donneurs d'ordre et prescripteurs de crĂ©ation. Nous nous appuierons pour ce faire sur les exemples plus spĂ©cifiques de l'Ă©dition littĂ©raire, du cinĂ©ma et de la tĂ©lĂ©vision. Ils nous permettront de dĂ©velopper un modĂšle thĂ©orique reposant sur une reprĂ©sentation de la distribution sous forme de rĂ©seau. Ce modĂšle permet d'illustrer plus prĂ©cisĂ©ment les mouvements Ă l'Ćuvre dans les marchĂ©s des biens culturels (transformation des modĂšles d'affaires sous l'effet conjoint de la grande distribution et de la dĂ©matĂ©rialisation de la consommation, poids des phĂ©nomĂšnes associĂ©s Ă la de promotion des Ćuvres...)
The HOA library, review and prospects
International audienceIn this paper, we present the HOA Library, an open source high order ambisonic spatialisation tools collection programmed in C++. We expose the objectives and characteristics of the project, which treat the potential of high order Ambisonics in a musical perspective, based on the practice and the creativity of the electronic musicians. We clarify the context of use, the choice of optimization and decoding. We review the implementations of thelibrary in various environments, such Max, Pure Data, and Faust. We discuss the use of feedback from musicians and members of especially Max and Pure Data community. Finally, we advance the prospects of the HOA library in its current developments in three dimensions
The economics and business models of prescription in the Internet
Our premise is that the mechanisms at work in distribution and intermediation at stake in the business models existing on Internet should be assessed in terms of a prescription economy. By analyzing the markets in terms of prescription, i.e. the capacity of a firm to transform the potential request of a customer into a specific proposal of products, we can investigate the structure of a product or service supply, the decision-making process involved in purchasing, market configurations, and business strategies and models. Analyzing intermediation and information markets in terms of prescription means considering three-pronged markets where prescribers are not simple intermediaries but third parties : they act alongside producers and consumers â not between them â in order to structure the product or service supply or to assume responsibility for some aspect of the consumer decision. If we proceed on this assumption, we can identify the market strategies and structures that characterize a prescription economy.L'Ă©conomie de l'Internet a contribuĂ© Ă une ouverture du jeu concurrentiel en dissociant les fonctions physique et informationnelle des activitĂ©s de distribution. Plus prĂ©cisĂ©ment, elle a ouvert la voie Ă de nouvelles structures de marchĂ© en mettant en avant une fonction de prescription clairement distincte des fonctions d'offre d'une part, des fonctions logistiques et de mise Ă disposition des biens d'autre part. Nous nous attachons ici Ă montrer que l'analyse des fonctions et modalitĂ©s de prescription permet de mieux comprendre les modĂšles d'affaires et les structures concurrentielles Ă l'Ćuvre dans l'Ă©conomie de l'Internet organisĂ©es autour de l'articulationde trois marchĂ©s : biens primaires, rĂ©fĂ©rencement, prescription. Cette modĂ©lisation de marchĂ©s Ă prescription contribue Ă enrichir la comprĂ©hension des chaĂźnes de valeur et des relations d'affaires repĂ©rables dans l'Internet
- âŠ