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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Guéritaud, François;

    Nous étudions certaines décompositions de M en polyèdres idéaux, où M est une variété hyperbolique à pointe(s), de dimension 3. Par un théorème d'Epstein et Penner, il existe une telle décomposition, dite ``de Delaunay'', canonique en un sens géométrique. Au chapitre 1 nous trouvons la décomposition de Delaunay quand M fibre sur le cercle avec pour fibre un tore percé. La méthode consiste à ``deviner'' la combinatoire de la décomposition, puis à trouver des angles dièdres positifs pour ses polyèdres combinatoires : un théorème de Rivin dit que tout point critique de la fonctionelle volume dans l'espace de déformation des angles dièdres fournit la métrique hyperbolique. Les inégalités établies pour montrer l'existence d'un tel point critique permettent alors de vérifier que la décomposition est bien de Delaunay. Au chapitre 2 nous étendons la méthode à certains complémentaires d'entrelacs (entrelacs à 2 ponts notamment). Au chapitre 3 nous l'étendons aux coeurs convexes de groupes quasi-fuchsiens du tore percé (la décomposition est alors infinie, et certaines pièces ne sont pas des polyèdres). Nous obtenons ainsi une nouvelle preuve du théorème des laminations de plissage pour le tore percé. Au chapitre 4, nous étendons partiellement la méthode aux complémentaires d'entrelacs arborescents : sans trouver de point critique, nous caractérisons les entrelacs arborescents hyperboliques. Au chapitre 5, qui éclaire un passage du chapitre 3, nous montrons que certains polynômes de Laurent, qui généralisent les nombres de Markoff, n'ont que des coefficients positifs. We study certain decompositions of M into ideal polyhedra, where M is a cusped hyperbolic 3-manifold. A result of Epstein and Penner states that such a decomposition exists: in particular, the so-called Delaunay decomposition, which is canonical in a geometric sense. In Chapter 1, we find the Delaunay decomposition for M a punctured-torus bundle over the circle. The method is to ``guess'' the combinatorics of the decomposition, then find positive dihedral angles for its combinatorial polyhedra: by a theorem of Rivin, any critical point of the volume functional in the deformation space of dihedral angles gives the hyperbolic metric. The inequalities involved in showing that such a critical point exists also imply that the decomposition is indeed Delaunay. In Chapter 2, we extend the method to certain link complements (notably, 2-bridge links). In Chapter 3 we extend it to convex cores of quasifuchsian punctured-torus groups (here the decomposition is infinite, and has some non-polyhedral pieces). As a corollary, we reprove the Pleating Lamination Theorem for punctured-torus groups. In Chapter 4, we partially extend the method to arborescent link complements: without finding critical points, we characterize hyperbolic arborescent links. In Chapter 5, extending a proposition of Chapter 3, we show that certain Laurent polynomials, which generalize the Markoff numbers, have only positive coefficients.

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    Hyper Article en Ligne
    Other literature type . 2006
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      Hyper Article en Ligne
      Other literature type . 2006
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    Authors: A. G. Goodridge; W. R. Carpenter; J E Fisch; M. J. Goldman; +2 Authors

    Starvation, glucagon and cyclic AMP inhibit, and refeeding starved animals and insulin or IGF-I plus triiodothyronine stimulate accumulation of FAS and its mRNA in liver; transcription is the primary regulated step. In the uropygial gland, differentiation of basal cells into mature sebocytes is accompanied by the accumulation of large amounts of FAS and its mRNA. By analogy with liver, transcription is likely to be the regulated step, but direct experimental evidence for this hypothesis is lacking. FAS mRNA is a unique gene and is probably more than 100 kb in length. The FAS gene of goose and duck is transcribed into two mature mRNAs of about 10,800 and 12,200 nucleotides. The 3'-untranslated regions of the FAS mRNAs contain an unusual polypyrimidine tract which, at the mRNA level at least, appears unrelated to regulation of gene expression. Polypyrimidine tracts similar in sequence to that in the FAS gene are found in about 20 different parts of the genome. All of the fragments which contain these tracts are hypermethylated. The next stage of this investigation will involve identification of cis-acting sequence elements in the FAS gene which specify responses to diet, hormones and tissue-specific regulatory factors. Isolation and characterization of the 5'-ends of the cDNA and the gene are underway.

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    Hal-Diderot
    Other literature type . 1989
    Data sources: Hal-Diderot
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      Hal-Diderot
      Other literature type . 1989
      Data sources: Hal-Diderot
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    Authors: Yinan Zhou; Pierre Kaser;

    Presentation Dernier rejeton d'une longue lignee d'homme de lettres, le jeune Zhang Dai 張岱 (1597-1681) connut l'opulence d'un riche lettre oisif, s'adonnant tout a loisir a sa passion pour la litterature et a son gout tres marque pour le theâtre avant de tout perdre au moment de la chute des Ming 明 (1644). Reste fidele a la defunte dynastie, il brava les interdits en en redigeant l'histoire. Depouille et traque, il eprouva la misere et la clandestinite, ce qui explique que la plupart de ses e...

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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Impressions d’Extrême-Orient
    Article . 2017
    License: cc-by-nc-nd
    HAL AMU
    Article . 2017
    Data sources: HAL AMU
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Impressions d’Extrême-Orient
      Article . 2017
      License: cc-by-nc-nd
      HAL AMU
      Article . 2017
      Data sources: HAL AMU
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Koenig, Gérard;

    Après avoir présenté la définition à partir de laquelle peut être appréciée la contribution de FCS au management stratégique, cet article se structure autour de deux préoccupations qui ont trait à la dynamique de production des connaissances dans le champ. La première s'inscrit dans le plan défini par les dimensions empi-rique et analytique. Elle concerne le risque que l'obsession de la nouveau-té théorique fait courir au processus de connaissance. La seconde préoccupation touche au contenu thématique de la recherche en management stratégique. Constitué de couples, comme celui que forment organisation et stratégie, cet axe thématique, que l'on peut concevoir comme orthogonal aux dimensions empirique et analytique est le lieu où s'invente le management stratégique, où des oppositions se nouent et où se pose la question de leur éventuel dépasse-ment. Mots clés : management stratégique – revues scientifiques – politiques éditoriales – développement de la con-naissance – obsession pour la théorie. After having presented the definition of strategic management from which the contribution of FCS can be recognized, the article moves on to examine two issues closely related to the dynamics of knowledge production in this domain. The first issue is found within the space defined by the empirical and analytical dimensions and concerns the risks for the knowledge process brought about by an obsession with theoretical novelty. The second issue concerns the thematic content of strategic management research. This content can be viewed as structured along various dimensions, each of them being composed of a thematic couple, such as the one that associates organization and strategy. This thematic space, which can be thought of as orthogonal to the space defined by empirical and analytical dimensions, is where strategic management is invented, where oppositions emerge, and where the question of their synthesis can be raised.

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    HAL UPEC
    Other literature type . 2008
    Data sources: HAL UPEC
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    Authors: Andéol, Guillaume; Guillaume, Anne; Pellieux, Lionel; Savel, Sophie; +1 Authors

    National audience; La capacité à localiser une source sonore dans l'espace varie grandement d'un auditeur à l'autre. Plusieurs auteurs ont proposé que cette variabilité pourrait être liée à des différences individuelles dans le traitement perceptif des indices acoustiques de localisation, et plus particulièrement dans le traitement des indices dits « spectraux » , impliqués dans la perception de l'élévation d'une source sonore. Ces indices spectraux proviennent de l'effet de diffraction produit par le relief anatomique de l'auditeur sur l'onde sonore incidente. Ils concernent essentiellement la partie haute fréquence du spectre audible (>3-4 kHz). Or, la variabilité inter-individuelle de la capacités d'analyse spectrale dans cette région fréquentielle est élevée. Nous proposons de tester l'hypothèse selon laquelle les différences individuelles en analyse spectrale pourraient partiellement expliquer celles observées en localisation sonore. Nous avons mesuré la capacité d'analyse spectrale de 18 participants via 2 tests couramment employés dans la littérature: le « ripple reversal » et le « spectral modulation detection ». Ensuite, ces participants ont réalisé des séances de détection et des séances de localisation de stimulus sonores dans le silence et dans le bruit. Les données ainsi recueillies montrent une corrélation significative entre capacité d'analyse spectrale et capacité de localisation sonore.

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    HAL AMU
    Conference object . 2010
    Data sources: HAL AMU
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      Conference object . 2010
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    Authors: Wayne M. Getz; D. Brückner; K.B. Smith;

    International audience

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    Hal-Diderot
    Other literature type . 1989
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    Apidologie
    Article
    Data sources: UnpayWall
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    Apidologie
    Article . 1989
    Data sources: Crossref
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      Hal-Diderot
      Other literature type . 1989
      Data sources: Hal-Diderot
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Apidologie
      Article
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      Apidologie
      Article . 1989
      Data sources: Crossref
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    Authors: Bonaciu, M.;

    Ces dernières années, la complexité des puces a augmenté exponentiellement. La possibilité d'intégrer plusieurs processeurs sur la même puce représente un gain important, et amène au concept du système multiprocesseur hétérogène sur puce (MP-SoC). Cet aspect a permis d'amplifier de manière significative la puissance de calcule fourni par ce type de puce. Il est même devenu possible d'intégrer des applications complexes sur une seule puce, applications qui nécessitent beaucoup de calculs, de communications et de mémoires. Dans cette catégorie, on peut trouver les applications de traitement vidéo MPEG4. Pour obtenir de bonnes implémentations en termes de performances, (1) un algorithme de l'encodeur MPEG4 flexible a été réalisé, pouvant être facilement adapté pour différents types de paramètres d'algorithme, mais également différents niveaux de parallélisme/pipeline. Puis, (2) une modélisation flexible a été utilisée, pour représenter différents models d'algorithme et d'architecture contenant 2 SMP. Utilisant ces models, (3) une exploration d'algorithme et d'architecture à un haut niveau d'abstraction a été proposé, en vue de trouver les configurations correctes d'algorithme et d'architectures, nécessaires pour différents applications. A partir de ces configurations, (4) un flot automatique d'implémentation d'architectures RTL a été utilisé. En utilisant ces aspects, l'encodeur MPEG4 a été implémenté avec succès dans plusieurs architectures spécifiques MP-SoC au niveau RTL. La même approche a été utilisée pour l'implémentation de l'encodeur MPEG4 sur une architecture quadri-processeurs existante, pour différentes résolutions, frame-rate, bitrates, etc. During the last years, the chip's complexity increased exponentially. The possibility to integrate multiple processors into the same chip represents an important gain, at it leads to the concept of Multi-Processors Systems on Chip (MP-SoC). This aspect allowed boosting the computational power offered by the chips. Thus, it became possible to integrate complex applications into a chip, applications that requires a large amount of computations, communications and memory. In this category, we can find the video treatment applications, like the MPEG4. To obtain good implementation results in term of performance, (1) a flexible MPEG4 encoder algorithm was developed, which can be easily adapted for different algorithm parameters, and different parallel/pipeline execution schemes. After this, (2) a flexible modeling was used, in order to represent different algorithm/architecture models containing 2 SMPs. Using these models, (3) a high-level algorithm/architecture exploration method was used, to find the optimal algorithm/architecture configurations required by different applications (i.e. mobile telecom). Using these parameters, (4) an automatic flow was used, to obtain final RTL architectures containing the MPEG4 encoder. Using all these aspects, the MPEG4 encoder was successfully implemented into multiple specific RTL architectures. Additionally, using the same approach, the MPEG4 encoder was implemented on an existing quadric-processors platform, for different video resolutions, frame rates, bitrates, etc.

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    Authors: Francois Bonnet;

    International audience; Le vol en interne - les vols commis par les employés sur leur lieu de travail - représente une masse considérable de délits. La littérature économique et de management n'analyse le vol en interne que pour se demander comment le réduire ; la littérature sociologique en fait un acte de résistance contre l'injustice au travail. Dans ce travail, on replace le vol en interne dans le cadre de la routine activity approach (un courant 'choix rationnel' de la criminologie américaine) à partir d'une enquête dans les secteurs de la grande distribution et du nettoyage. Analyser le vol en interne comme une délinquance routinière permet de voir que celui-ci est moins une déviance par rapport à une norme qu'une fonction des opportunités et de la surveillance. La théorie du principal-agent et des coûts d'agence est mobilisée pour comprendre que la surveillance du vol s'inscrit moins dans une logique de prévention/répression que de tolérance/acceptation de ce qu'on ne peut pas surveiller. Délinquance routinière, le vol en interne provoque moins le scandale qu'il n'est susceptible d'être instrumentalisé par ses victimes - les employeurs pouvant utiliser le vol comme prétexte pour le licenciement. Les enjeux théoriques de la routine activity approach sont discutés en conclusion.

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    Authors: Williams-Wanquet, Eileen;

    Communication à la Journée de recherche du CRLHOI "Texte et politique" en avril 2013 à l'Université de La Réunion; National audience; Indigo (1993) de Marina Warner, qui reprend, à la fois, l'Histoire coloniale anglaise et La Tempête de Shakespeare, illustre bien une des tendances de la littérature britannique des années 1980 et 1990, qui commente le monde à travers la révision de l'idéologie transmise par des « hypotextes » précis. Cet article vise à montrer la manière dont, pour reprendre les termes de Jacques Rancière, « la littérature fait de la politique en tant que littérature ». Ce que Rancière nomme le caractère propre-impropre de la littérature est ce qui lui permet d'avoir une portée politique, en « reconfigurant la carte du sensible ». J'utiliserai les trois temps décrits par Rancière pour éclairer la démarche de Warner : la « police », ou l'ordre établi, dans lequel Warner ancre son histoire de manière réaliste ; « la poli-tique », ou la remise en cause de cet ordre, par l'utilisation de procédés tels que l'ironie, l'inversion de point de vue, ou l'hypertextualité ; « le politique », ou l'appel éthique à un nouvel ordre utopique, par le recours à l'intertextualité, au réalisme magique ou à la symbolique. La réécriture de l'idéologie transmise par l'hypotexte équivaut à une révision de l'hypotexte diffus de la Modernité.

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    Authors: Dumont, Gérard-François; Chalard, Laurent;

    Au moins depuis l'intrusion de l'armée soviétique en 1979, l'histoire géopolitique de l'Afghanistan est particulièrement singulière, puisque ce pays s'est trouvé au cœur de la confrontation Est-Ouest, puis de la " guerre contre le terrorisme ". Il serait donc loisible de penser que l'Afghanistan présente une exception aux lois de la géopolitique des populations. Or, il n'en est rien. Pour l'attester, nous allons introduire deux notions, la géopolitique des populations " séculière " et celle " régulière ". [At least since the intrusion of the Soviet army in 1979, the geopolitical history of Afghanistan is particularly remarkable, since this country has been at the heart of the East-West confrontation and the "war against terrorism ". It is therefore permissible to think that Afghanistan is an exception to the laws of geopolitics populations. However, it is not. To attest, we introduce two concepts, the geopolitics of people "secular" and the "regular"]

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    Authors: Guéritaud, François;

    Nous étudions certaines décompositions de M en polyèdres idéaux, où M est une variété hyperbolique à pointe(s), de dimension 3. Par un théorème d'Epstein et Penner, il existe une telle décomposition, dite ``de Delaunay'', canonique en un sens géométrique. Au chapitre 1 nous trouvons la décomposition de Delaunay quand M fibre sur le cercle avec pour fibre un tore percé. La méthode consiste à ``deviner'' la combinatoire de la décomposition, puis à trouver des angles dièdres positifs pour ses polyèdres combinatoires : un théorème de Rivin dit que tout point critique de la fonctionelle volume dans l'espace de déformation des angles dièdres fournit la métrique hyperbolique. Les inégalités établies pour montrer l'existence d'un tel point critique permettent alors de vérifier que la décomposition est bien de Delaunay. Au chapitre 2 nous étendons la méthode à certains complémentaires d'entrelacs (entrelacs à 2 ponts notamment). Au chapitre 3 nous l'étendons aux coeurs convexes de groupes quasi-fuchsiens du tore percé (la décomposition est alors infinie, et certaines pièces ne sont pas des polyèdres). Nous obtenons ainsi une nouvelle preuve du théorème des laminations de plissage pour le tore percé. Au chapitre 4, nous étendons partiellement la méthode aux complémentaires d'entrelacs arborescents : sans trouver de point critique, nous caractérisons les entrelacs arborescents hyperboliques. Au chapitre 5, qui éclaire un passage du chapitre 3, nous montrons que certains polynômes de Laurent, qui généralisent les nombres de Markoff, n'ont que des coefficients positifs. We study certain decompositions of M into ideal polyhedra, where M is a cusped hyperbolic 3-manifold. A result of Epstein and Penner states that such a decomposition exists: in particular, the so-called Delaunay decomposition, which is canonical in a geometric sense. In Chapter 1, we find the Delaunay decomposition for M a punctured-torus bundle over the circle. The method is to ``guess'' the combinatorics of the decomposition, then find positive dihedral angles for its combinatorial polyhedra: by a theorem of Rivin, any critical point of the volume functional in the deformation space of dihedral angles gives the hyperbolic metric. The inequalities involved in showing that such a critical point exists also imply that the decomposition is indeed Delaunay. In Chapter 2, we extend the method to certain link complements (notably, 2-bridge links). In Chapter 3 we extend it to convex cores of quasifuchsian punctured-torus groups (here the decomposition is infinite, and has some non-polyhedral pieces). As a corollary, we reprove the Pleating Lamination Theorem for punctured-torus groups. In Chapter 4, we partially extend the method to arborescent link complements: without finding critical points, we characterize hyperbolic arborescent links. In Chapter 5, extending a proposition of Chapter 3, we show that certain Laurent polynomials, which generalize the Markoff numbers, have only positive coefficients.

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    Authors: A. G. Goodridge; W. R. Carpenter; J E Fisch; M. J. Goldman; +2 Authors

    Starvation, glucagon and cyclic AMP inhibit, and refeeding starved animals and insulin or IGF-I plus triiodothyronine stimulate accumulation of FAS and its mRNA in liver; transcription is the primary regulated step. In the uropygial gland, differentiation of basal cells into mature sebocytes is accompanied by the accumulation of large amounts of FAS and its mRNA. By analogy with liver, transcription is likely to be the regulated step, but direct experimental evidence for this hypothesis is lacking. FAS mRNA is a unique gene and is probably more than 100 kb in length. The FAS gene of goose and duck is transcribed into two mature mRNAs of about 10,800 and 12,200 nucleotides. The 3'-untranslated regions of the FAS mRNAs contain an unusual polypyrimidine tract which, at the mRNA level at least, appears unrelated to regulation of gene expression. Polypyrimidine tracts similar in sequence to that in the FAS gene are found in about 20 different parts of the genome. All of the fragments which contain these tracts are hypermethylated. The next stage of this investigation will involve identification of cis-acting sequence elements in the FAS gene which specify responses to diet, hormones and tissue-specific regulatory factors. Isolation and characterization of the 5'-ends of the cDNA and the gene are underway.

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    Authors: Yinan Zhou; Pierre Kaser;

    Presentation Dernier rejeton d'une longue lignee d'homme de lettres, le jeune Zhang Dai 張岱 (1597-1681) connut l'opulence d'un riche lettre oisif, s'adonnant tout a loisir a sa passion pour la litterature et a son gout tres marque pour le theâtre avant de tout perdre au moment de la chute des Ming 明 (1644). Reste fidele a la defunte dynastie, il brava les interdits en en redigeant l'histoire. Depouille et traque, il eprouva la misere et la clandestinite, ce qui explique que la plupart de ses e...

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    Impressions d’Extrême-Orient
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      Impressions d’Extrême-Orient
      Article . 2017
      License: cc-by-nc-nd
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      Article . 2017
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    Authors: Koenig, Gérard;

    Après avoir présenté la définition à partir de laquelle peut être appréciée la contribution de FCS au management stratégique, cet article se structure autour de deux préoccupations qui ont trait à la dynamique de production des connaissances dans le champ. La première s'inscrit dans le plan défini par les dimensions empi-rique et analytique. Elle concerne le risque que l'obsession de la nouveau-té théorique fait courir au processus de connaissance. La seconde préoccupation touche au contenu thématique de la recherche en management stratégique. Constitué de couples, comme celui que forment organisation et stratégie, cet axe thématique, que l'on peut concevoir comme orthogonal aux dimensions empirique et analytique est le lieu où s'invente le management stratégique, où des oppositions se nouent et où se pose la question de leur éventuel dépasse-ment. Mots clés : management stratégique – revues scientifiques – politiques éditoriales – développement de la con-naissance – obsession pour la théorie. After having presented the definition of strategic management from which the contribution of FCS can be recognized, the article moves on to examine two issues closely related to the dynamics of knowledge production in this domain. The first issue is found within the space defined by the empirical and analytical dimensions and concerns the risks for the knowledge process brought about by an obsession with theoretical novelty. The second issue concerns the thematic content of strategic management research. This content can be viewed as structured along various dimensions, each of them being composed of a thematic couple, such as the one that associates organization and strategy. This thematic space, which can be thought of as orthogonal to the space defined by empirical and analytical dimensions, is where strategic management is invented, where oppositions emerge, and where the question of their synthesis can be raised.

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    HAL UPEC
    Other literature type . 2008
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    Authors: Andéol, Guillaume; Guillaume, Anne; Pellieux, Lionel; Savel, Sophie; +1 Authors

    National audience; La capacité à localiser une source sonore dans l'espace varie grandement d'un auditeur à l'autre. Plusieurs auteurs ont proposé que cette variabilité pourrait être liée à des différences individuelles dans le traitement perceptif des indices acoustiques de localisation, et plus particulièrement dans le traitement des indices dits « spectraux » , impliqués dans la perception de l'élévation d'une source sonore. Ces indices spectraux proviennent de l'effet de diffraction produit par le relief anatomique de l'auditeur sur l'onde sonore incidente. Ils concernent essentiellement la partie haute fréquence du spectre audible (>3-4 kHz). Or, la variabilité inter-individuelle de la capacités d'analyse spectrale dans cette région fréquentielle est élevée. Nous proposons de tester l'hypothèse selon laquelle les différences individuelles en analyse spectrale pourraient partiellement expliquer celles observées en localisation sonore. Nous avons mesuré la capacité d'analyse spectrale de 18 participants via 2 tests couramment employés dans la littérature: le « ripple reversal » et le « spectral modulation detection ». Ensuite, ces participants ont réalisé des séances de détection et des séances de localisation de stimulus sonores dans le silence et dans le bruit. Les données ainsi recueillies montrent une corrélation significative entre capacité d'analyse spectrale et capacité de localisation sonore.

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    Authors: Wayne M. Getz; D. Brückner; K.B. Smith;

    International audience

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    Apidologie
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    Apidologie
    Article . 1989
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      Apidologie
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      Apidologie
      Article . 1989
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    Authors: Bonaciu, M.;

    Ces dernières années, la complexité des puces a augmenté exponentiellement. La possibilité d'intégrer plusieurs processeurs sur la même puce représente un gain important, et amène au concept du système multiprocesseur hétérogène sur puce (MP-SoC). Cet aspect a permis d'amplifier de manière significative la puissance de calcule fourni par ce type de puce. Il est même devenu possible d'intégrer des applications complexes sur une seule puce, applications qui nécessitent beaucoup de calculs, de communications et de mémoires. Dans cette catégorie, on peut trouver les applications de traitement vidéo MPEG4. Pour obtenir de bonnes implémentations en termes de performances, (1) un algorithme de l'encodeur MPEG4 flexible a été réalisé, pouvant être facilement adapté pour différents types de paramètres d'algorithme, mais également différents niveaux de parallélisme/pipeline. Puis, (2) une modélisation flexible a été utilisée, pour représenter différents models d'algorithme et d'architecture contenant 2 SMP. Utilisant ces models, (3) une exploration d'algorithme et d'architecture à un haut niveau d'abstraction a été proposé, en vue de trouver les configurations correctes d'algorithme et d'architectures, nécessaires pour différents applications. A partir de ces configurations, (4) un flot automatique d'implémentation d'architectures RTL a été utilisé. En utilisant ces aspects, l'encodeur MPEG4 a été implémenté avec succès dans plusieurs architectures spécifiques MP-SoC au niveau RTL. La même approche a été utilisée pour l'implémentation de l'encodeur MPEG4 sur une architecture quadri-processeurs existante, pour différentes résolutions, frame-rate, bitrates, etc. During the last years, the chip's complexity increased exponentially. The possibility to integrate multiple processors into the same chip represents an important gain, at it leads to the concept of Multi-Processors Systems on Chip (MP-SoC). This aspect allowed boosting the computational power offered by the chips. Thus, it became possible to integrate complex applications into a chip, applications that requires a large amount of computations, communications and memory. In this category, we can find the video treatment applications, like the MPEG4. To obtain good implementation results in term of performance, (1) a flexible MPEG4 encoder algorithm was developed, which can be easily adapted for different algorithm parameters, and different parallel/pipeline execution schemes. After this, (2) a flexible modeling was used, in order to represent different algorithm/architecture models containing 2 SMPs. Using these models, (3) a high-level algorithm/architecture exploration method was used, to find the optimal algorithm/architecture configurations required by different applications (i.e. mobile telecom). Using these parameters, (4) an automatic flow was used, to obtain final RTL architectures containing the MPEG4 encoder. Using all these aspects, the MPEG4 encoder was successfully implemented into multiple specific RTL architectures. Additionally, using the same approach, the MPEG4 encoder was implemented on an existing quadric-processors platform, for different video resolutions, frame rates, bitrates, etc.