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See detailL1-based compression of random forest models
Joly, Arnaud ULg; Schnitzler, François ULg; Geurts, Pierre ULg et al

in 20th European Symposium on Artificial Neural Networks (2012, April)

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive ... [more ▼]

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive, specially in the context of problems with very high-dimensional input spaces. We propose to study their compressibility by applying a L1-based regularization to the set of indicator functions defined by all their nodes. We show experimentally that preserving or even improving the model accuracy while significantly reducing its space complexity is indeed possible. [less ▲]

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See detailHumidity 3D field comparisons between GNSS tomography, IASI satellite observations and ALARO model
Brenot, Hugues; Champollion, Cedric; Deckmyn, Alex et al

in Geophysical Research Abstracts (2012, April), 14

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See detailThe Venus nitric oxide nightglow vertical distribution : update, new features and modelling
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Soret, Lauriane ULg et al

Poster (2012, April)

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for ... [more ▼]

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument on board Venus Express (VEX). Excited NO molecules on the night side of the planet find their source in the radiative recombinaison of O(3P) and N(4S) atoms produced on the dayside by Extreme Ultraviolet (EUV) solar photons that cause photodissociation of CO2 and N2 molecules. We analyse with an improved statistics the behaviour of the vertical emission profile of the NO nightglow. We also present a method used to retrieve and analyse the volume emission rate. We describe the dependence of the vertical distribution with latitude and local time and its variability. New features in the vertical distribution of the NO emission such as double peaks are also exhibited. Furthermore, we use a one-dimensional chemical-diffusive model to compare the major features of the calculated O2 1.27 microm and NO UV emissions profiles with those observed with SPICAV. [less ▲]

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See detailAllergenic properties of the house dust mite protease Der p 3
Bouaziz, Ahlem ULg

Poster (2012, April)

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See detailPoroelastic Center of Dilation Revisited
Huynen, Alexandre ULg

Master of advanced studies dissertation (2012)

In both elasticity and poroelasticity, the nucleus of strain is usually used to refer to a singular solution such as the point force, the force dipole, the centers of rotation and dilation, etc. These ... [more ▼]

In both elasticity and poroelasticity, the nucleus of strain is usually used to refer to a singular solution such as the point force, the force dipole, the centers of rotation and dilation, etc. These fundamentals solutions constitute the building blocks for various problems of practical importance and are, therefore, relatively well understood. However, a comparison of the original elastic solution for the center of dilation with the classic Lamé solution reveals an unexpected dependence of the center of dilation solution on the Poisson’s ratio. This inconsistency is investigated by means of two alternative representations of the singularity and leads to the identification of a compressed zone inside the singularity. The poroelastic equivalent to this nucleus of strain is shown to be the superposition of the elastic one with drained material parameters and an instantaneous point fluid source associated with a finite volume of fluid that is expelled from the compressed region inside the singularity and is injected in the porous medium. [less ▲]

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See detailEnsembles reconnaissables de rationnels
Charlier, Emilie ULg

Scientific conference (2012, April)

In this talk I will introduce the recognizable sets of rationals, following the formalism of Jeffrey Shallit. I will point out several open questions regarding this topic.

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See detailIntroduction générale
Bouhon, Frédéric ULg; Reuchamps, Min ULg

in Bouhon, Frédéric; Reuchamps, Min (Eds.) Les systèmes électoraux de la Belgique (2012)

Cette introduction ouvre un ouvrage collectif consacré aux systèmes électoraux de la Belgique. Elle insiste sur le caractère multidisciplinaire de l'étude des questions électorales qui est proposée dans ... [more ▼]

Cette introduction ouvre un ouvrage collectif consacré aux systèmes électoraux de la Belgique. Elle insiste sur le caractère multidisciplinaire de l'étude des questions électorales qui est proposée dans le livre et en présente le plan. [less ▲]

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See detailLa dissuasion. Histoire du nucléaire militaire français
Dumoulin, André ULg

in Histoire & Stratégie (2012), (10),

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See detailL'obésité de l'enfant: Rencontre et parole donnée
Battisti, Oreste ULg

Learning material (2012)

vidéo comprenant les interviews de certaines familles confrontés à l'obésité.

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See detailMathémagie 2
Rigo, Michel ULg

Speech/Talk (2012)

Nous présentons ici des tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination etc. Contrairement au magicien qui ne ... [more ▼]

Nous présentons ici des tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination etc. Contrairement au magicien qui ne dévoile jamais ses secrets, ici, nous expliquons que ces tours reposent sur diverses propriétés et constructions mathématiques (décomposition d'une permutation en produit de cycle, suites linéaires récurrentes, ...). Il y en aura donc pour tous les goûts... et tous les niveaux. Dans la mesure du possible, nous présenterons de "nouveaux" tours qui n'auraient pas déjà été dévoilés dans un exposé précédent. [less ▲]

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See detailEffects of platelet-rich plasma on the healing of tendons: animal model
Kaux, Jean-François ULg; Drion, Pierre ULg; Colige, Alain ULg et al

in Biomedica 2012 (2012, April)

Introduction: Platelet-Rich Plasma (PRP) contains lot of growth factors which could enhance the healing process of different tissues. We aimed to determine if a single injection of PRP could improve the ... [more ▼]

Introduction: Platelet-Rich Plasma (PRP) contains lot of growth factors which could enhance the healing process of different tissues. We aimed to determine if a single injection of PRP could improve the cicatrisation of ruptured Achilles tendons of rats. Material and Methods: A 5mm defect was surgically made in the Achilles tendon of 120 rats. A few hours after surgery, 45 rats received a PRP or PBS injection in situ. After 5, 15 and 30 days, 20 rats of both groups were euthanized and 15 collected tendons were immediately submitted to a biomechanical tensile strength test until rupture using a “cryo-jaw” device. After, theses samples were used for transcriptomic analyses. Histological and biochemical analyses were performed on the five remained tendons in each group. Results: Tendons in the PRP group were more resistant to rupture at 15 and 30 days than those in the control group. The transverse area of tendons in the PRP group was significantly higher at day 5 and 15. The constraint was significantly increased in tendons of the PRP group in the late phase of the healing (day 30). Histological and immunohistological analysis showed an increased staining for fibrillar collagen at day 5 confirmed by a biochemical analysis showing an increased collagen concentration in the callus. The expression of tenomodulin, a tenocyte differentiation marker, was significantly higher in the PRP-treated tendons at day 5. No significant difference in terms of mRNA for type III collagen and matrix metalloproteinase 9 was observed at any time between the 2 groups. Conclusion: A single injection of PRP in sectioned Achilles tendon of rats few hours after surgery influences the early phase of tendons healing, resulting in an ultimate stronger mechanical resistance. [less ▲]

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See detailLes régimes matrimoniaux en droit international privé - autour de trois questions d'actualité
Wautelet, Patrick ULg

in Revue Droit International Privé = Tijdschrift voor Internationaal Privaatrecht (2012), 11(1), 29-43

Ce papier fait le point sur trois questions d'actualité dans la pratique du droit international privé des régimes matrimoniaux. Ces questions ont été sélectionnées parce qu'elles peuvent également se ... [more ▼]

Ce papier fait le point sur trois questions d'actualité dans la pratique du droit international privé des régimes matrimoniaux. Ces questions ont été sélectionnées parce qu'elles peuvent également se poser dans d'autres domaines du droit international privé : il s'agit d'abord de la distinction entre questions de forme et questions de fond, ensuite de l'appréhension et du fonctionnement des règles de rattachement fondée sur une échelle de rattachement et enfin de l'application concrète de l'exception d'ordre public [less ▲]

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See detailPosture polémique ou polémisation de la posture ?
Moor, Louise ULg

in COnTEXTES : Revue de Sociologie de la Littérature (2012), 10

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See detailTip cells at the top: multiscale modeling of angiogenesis during fracture healing
Carlier, Aurélie ULg; Geris, Liesbet ULg; Van Oosterwyck, Hans

in Computer Methods in Biomechanics and Biomedical Engineering (CMBBE) - Proceedings (2012, April)

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See detailLes polémiques autour de la littérature jeunesse, ou la quête sans cesse rejouée de la légitimité
Barnabé, Fanny ULg

in COnTEXTES : Revue de Sociologie de la Littérature (2012), (10),

Cet article analyse les enjeux dissimulés derrière une polémique qui a débuté suite à un article de François Busnel, publié le 24 novembre 2010 dans l’Express-Lire, dans lequel ce dernier dénigre la ... [more ▼]

Cet article analyse les enjeux dissimulés derrière une polémique qui a débuté suite à un article de François Busnel, publié le 24 novembre 2010 dans l’Express-Lire, dans lequel ce dernier dénigre la littérature jeunesse et l’accuse de n’être qu’un "coup marketing". Cette publication a déclenché de nombreuses réactions chez les représentants de ce secteur. L'analyse proposée ici tâche de rendre compte, en confrontant les deux types de prises de parole, de l’impact que peut avoir l’objet d'une polémique (la littérature jeunesse, dans ce cas-ci) sur le déroulement de celle-ci. [less ▲]

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See detailEuropese rechtspraak : actualia/ actualités: jurisprudence de la Cour de Justice
Durviaux, Ann-Lawrence ULg

in Marchés et Contrats Publics = Overheidsopdrachten en -Overeenkomsten (2012), 1/2012

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