References of "2007"
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See detailL’accompagnement professionnel face aux enjeux de qualité de services
Pirard, Florence ULg

in Brougère, G.; Vandenbroeck, M. (Eds.) Repenser l’éducation des jeunes enfants (2007)

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See detailConclusion
Otte, Marcel ULg; Chirica, Vasile; Haesaerts, Paul et al

in Otte, Marcel; Chirica, Vasile; Haesaerts, Paul (Eds.) L'Aurignacien et le Gravettien de Mitoc-Malu Galben (Moldavie roumaine) (2007)

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See detailMitoc-Malu Galben: industrie osseuse et témoins esthétiques
Chirica, Vasile; Noiret, Pierre ULg

in Otte, Marcel; Chirica, Vasile; Haesaerts, Paul (Eds.) L'Aurignacien et le Gravettien de Mitoc-Malu Galben (Moldavie roumaine) (2007)

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See detailMitoc-Malu Galben: étude de l'industrie lithique
Otte, Marcel ULg; Noiret, Pierre ULg; Chirica, Vasile et al

in Otte, Marcel; Chirica, Vasile; Haesaerts, Paul (Eds.) L'Aurignacien et le Gravettien de Mitoc-Malu Galben (Moldavie roumaine) (2007)

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See detailLa confrontation de l’offre et de la demande mondiales de céréales fixe désormais le prix payé au producteur européen
Burny, Philippe ULg

in Faculté universitaire des Sciences agronomiques de Gembloux; Centre wallon de Recherches agronomiques (Eds.) 40 ans Livre blanc Céréales-Gembloux février 2007 (2007)

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See detailGénération automatique d'une base de données de silhouettes humaines au moyen d'un avatar humain tridimensionnel
Pierard, Sébastien ULg

Master's dissertation (2007)

Pour la conception de systèmes de vidéo-surveillance, il est avantageux d’avoir un système de détection automatique d’êtres humains. Certains de ces systèmes sont basés sur la reconnaissance de la forme ... [more ▼]

Pour la conception de systèmes de vidéo-surveillance, il est avantageux d’avoir un système de détection automatique d’êtres humains. Certains de ces systèmes sont basés sur la reconnaissance de la forme de silhouettes humaines. L’utilisation de méthodes d'apprentissage pour la reconnaissance nécessite une base de données de silhouettes humaines, dont il est intéressant d’automatiser la génération. Dans ce travail, nous utilisons un avatar humain tridimensionnel, celui du projet open-source MakeHuman, afin de générer automatiquement la base de données. Le choix des configurations (positions, orientations et poses) à donner à l’avatar pour obtenir une base de données adéquate est central. Dans un premier temps, nous tentons une étude de l’impact de modifications dans le mode tridimensionnel sur la silhouette. Cet impact est quantifié par la distance de Hausdorff. Parmi les modifications envisagées se trouvent le déplacement, la rotation et le changement de pose de l’avatar. Nous espérions déterminer, à partir de ces impacts, les pas par lesquels doivent varier les différents paramètres. Les configurations que doit prendre l’avatar, pour obtenir une base de données suffisamment riche sans être trop volumineuse, seront obtenues en prenant toutes les combinaisons des valeurs des différents paramètres. Le nombre de configurations est exponentiel en le nombre de degrés de liberté, ce qui rend l’approche inutilisable en pratique, même si nous sommes indifférents à la translation et à la mise à l’échelle des silhouettes. Dans un deuxième temps, nous avons opté pour une approche radicalement différente. Cette fois, nous n’espaçons plus les silhouettes, mais les poses. La position de l’avatar est fixée et il ne peut tourner qu’autour de l’axe vertical. Les poses sont choisies en effectuant des tirages aléatoires des différents paramètres. Cette approche aléatoire du problème a mené à l’élaboration d’un nouveau logiciel, Silhouette. Il est écrit en Java et une interface écrite en C lui permet, grâce à Java Native Interface d’exploiter efficacement le moteur de pose de MakeHuman. Parmi les fonctionnalités de Silhouette, notons la possibilité de restreindre les poses à un ensemble voulu, de ne générer que des silhouettes correspondant à des poses licites et d’annoter les silhouettes. Grâce au logiciel mis en place, nous avons été en mesure de générer diverses bases de données. Nous avons étudié l'impact de l'utilisation de celles-ci sur les performances d'un système de détection de personnes existant. Nous obtenons des résultats encourageants, 73% des silhouettes humaines étant correctement détectées. Un raffinement et un paramétrage soigneux de la méthode devraient mener à des résultats excellents. [less ▲]

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See detailEpithelial-mesenchymal transition process in human embryonic stem cells cultured in feeder-free conditions.
Ullmann, U.; In'T Veld, P.; Gilles, Christine ULg et al

in Molecular Human Reproduction (2007), 13(1), 21-32

Feeder-free human embryonic stem cell (hESC) culture is associated with the presence of mesenchymal-like cells appearing at the periphery of the colonies. The aim of this study was to identify this early ... [more ▼]

Feeder-free human embryonic stem cell (hESC) culture is associated with the presence of mesenchymal-like cells appearing at the periphery of the colonies. The aim of this study was to identify this early differentiation process. Long-term feeder-free hESC cultures using matrigel and conditioned medium from mouse and from human origin revealed that the appearance of mesenchymal-like cells was similar regardless of the conditioned medium used. Standard characterization confirmed the preservation of hESC properties, but the feeder-free cultures could not be maintained longer than 37 passages. The early differentiation process was characterized in the short term after switching hESCs cultured on feeders to feeder-free conditions. Transmission electron microscopy showed an epithelium-like structure inside the hESC colonies, whereas the peripheral cells revealed the acquisition of a rather mesenchymal-like phenotype. Immunochemistry analysis showed that cells at the periphery of the colonies had a negative E-cadherin expression and a positive Vimentin expression, suggesting an epithelial–mesenchymal transition (EMT). Nuclear staining of ß-catenin, positive N-cadherin and negative Connexin 43 expression were also found in the mesenchymal-like cell population. After RT–PCR analysis, Slug and Snail, both EMT-related transcription factors, were detected as up-regulated in the mesenchymal-like cell population. Taken together, our data suggest that culturing hESCs in feeder-free conditions enhances an early differentiation process identified as an EMT. [less ▲]

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See detailDevelopment of atherosclerosis for the vascular surgeon.
Defraigne, Jean-Olivier ULg

in Liapis, C. D. (Ed.) European Manual of Medicine (2007)

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See detailHow does the age of hoverfly females affect their reproduction?
Almohamad, Raki; Verheggen, François ULg; Francis, Frédéric ULg et al

in Communications in Agricultural and Applied Biological Sciences (2007), 72(3),

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See detailNash equilibrium as the minimum of a function. Application to electricity markets with large number of actors
Beck, Elena Vdovina; Cherkaoui, Rachid; Minoia, Anna et al

in Proceedings of the 2007 Power Tech (2007)

We introduce in this paper a new approach for efficiently identifying Nash equilibria for games composed of large numbers of players having discrete and not too large strategy spaces. The approach is ... [more ▼]

We introduce in this paper a new approach for efficiently identifying Nash equilibria for games composed of large numbers of players having discrete and not too large strategy spaces. The approach is based on a characterization of Nash equilibria in terms of minima of a function and relies on stochastic optimization algorithms to find these minima. The approach is applied to compute Nash equilibria of some electricity markets and, based on the simulation results, its performances are discussed. [less ▲]

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See detailSpeciation of five arsenic species (arsenite, arsenate, MMAAV, DMAAV and AsBet) in different kind of water by HPLC-ICP-MS
Ronkart, Sébastien ULg; Laurent, Vincent; Carbonnelle, Philippe et al

in Chemosphere (2007), 66(4), 738-745

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See detailWhole body vibration in the treatment of fibromyalgia: Influence on muscle performances
Maquet, Didier ULg; Helene, Loic; Demoulin, Christophe ULg et al

in Isokinetics & Exercise Science (2007), 15

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See detailProsodic Transfer from L1 to L2. Methodological Issues and Description
Rasier, Laurent ULg; Hiligsmann, Philippe

in Nouveaux Cahiers de Linguistique Française (2007), 28

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See detailA damage constitutive law for steel elevated temperature. Identification of the parameters
Castagne, Sylvie; Talamona, D.; Habraken, Anne ULg

in International Journal of Material Processing (2007), (1), 23-43

This paper presents a methodology of damage analysis at elevated temperature using the finite element method. Both the model and the methodology to identify parameters are summarized. The mechanical ... [more ▼]

This paper presents a methodology of damage analysis at elevated temperature using the finite element method. Both the model and the methodology to identify parameters are summarized. The mechanical properties are established using compression tests at elevated temperature. An elasto-visco-plastic model depending on temperature is identified. A metallographic analysis is used to determine the original size and morphology of the austenitic grains. The experimental damage analyses consist in acoustic tests in order to determine the apparition of the first crack during compression. Finite element simulations of these experiments allow the determination of the damage parameters using a reverse method. [less ▲]

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See detailTwo new species of Multiclavula (lichenized basidiomycetes) from savanna soils in Rwanda (East Africa)
Fischer, Eberhard; Ertz, Damien; Killmann, Dorothee et al

in Botanical Journal of the Linnean Society (2007), 155

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See detailPréface: promouvoir la réflexion et la recherche sur l'anorexie
Born, Michel ULg

in L'observatoire, les Actes+ (2007)

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See detailIns(1,3,4,5)P4 negatively regulates PtdIns(3,4,5)P3 signaling in neutrophils
Jia, Y.; Subramanian, K. K.; Erneux, C. et al

in Immunity (2007), 27

Many neutrophil functions are regulated by phosphatidylinositol-3,4,5-trisphosphate (PtdIns(3,4,5)P3) that mediates protein membrane translocation via binding to pleckstrin homolog (PH) domains within ... [more ▼]

Many neutrophil functions are regulated by phosphatidylinositol-3,4,5-trisphosphate (PtdIns(3,4,5)P3) that mediates protein membrane translocation via binding to pleckstrin homolog (PH) domains within target proteins. Here we show that inositol 1,3,4,5-tetrakisphosphate(Ins(1,3,4,5)P4), a cytosolic small molecule, bound the same PH domain of target proteins and competed for binding to PtdIns(3,4,5)P3. In neutrophils, chemoattractant stimulation triggered rapid elevation in Ins(1,3,4,5)P4 concentration. Depletion of Ins(1,3,4,5)P4 by deleting the gene encoding InsP3KB, which converts Ins(1,4,5)P3 to Ins(1,3,4,5)P4, enhanced membrane translocation of the PtdIns(3,4,5)P3-specific PH domain. This led to enhanced sensitivity to chemoattractant stimulation, elevated superoxide production, and enhanced neutrophil recruitment to inflamed peritoneal cavity. On the contrary, augmentation of intracellular Ins(1,3,4,5)P4 concentrationblockedPHdomainmediated membrane translocation of target proteins and dramatically decreased the sensitivity of neutrophils to chemoattractant stimulation. These findings establish a role for Ins(1,3,4,5)P4 in cellular signal transduction pathways and provide another mechanism for modulating PtdIns(3,4,5)P3 signaling in neutrophils. [less ▲]

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