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See detailPerturbation finite element method for the analysis of earthing systems with vertical and horizontal rods
V Sabariego, Ruth ULg; Ferreira da Luz, Mauricio V.; Nzuru Nsekere, Jean-Pierre et al

in Proceedings of the 6ème Conférence Européenne sur les Méthodes Numériques en Electromagnétisme (NUMELEC2008) (2008, December)

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod or ... [more ▼]

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod or cable. Its solution must then be corrected by taking into account the influence of the other rods and cables. The electric scalar potential is transferred from one problem to the other through projections between meshes. An inherently 3D problem can thus be solved as a succession of 2D sub-problems, which significantly speeds up the solution and enables to tackle complicated grounding systems. [less ▲]

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See detailOverlay Routing using Coordinate Systems
Cantin, François ULg; Gueye, Cheikh Ahmadou Bamba ULg; Kaafar, Mohamed Ali ULg et al

Poster (2008, December)

We address the problem of finding indirect overlay paths that reduce the latency between pairs of nodes in an overlay. To this end we propose to rely on an Internet Coordinate System (ICS), namely Vivaldi ... [more ▼]

We address the problem of finding indirect overlay paths that reduce the latency between pairs of nodes in an overlay. To this end we propose to rely on an Internet Coordinate System (ICS), namely Vivaldi, to estimate RTTs and help find these interesting detours. We define two initial criteria to illustrate our approach and assess their true/false positive rates. [less ▲]

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See detailLake Hazar: a potential high-resolution 150 ka record of climate and tectonic interactions in Anatolia.
Boes, Xavier; Garcia, D; Avsar, U et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1942

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See detailDefining additional stratigraphy in paleosismic trenches by 2D logging of magnetic susceptibility. A paleoseismic investigation near Lake Ladik, North Anatolian Fault, Turkey.
Fraser, J; Hubert, Aurelia ULg; Vanneste, K. et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1942

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See detailSedimentological fingerprints of recent earthquakes in lake sediments: A case study on the North Anatolian Fault (NAF), Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1919

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See detail6-Substituted 2-Oxo-2h-1-Benzopyran-3-Carboxylic Acid Derivatives in a New Approach of the Treatment of Cancer Cell Invasion and Metastasis
Kempen, I.; Hemmer, Marc ULg; Counerotte, Stéphane ULg et al

in European Journal of Medicinal Chemistry (2008), 43(12), 2735-50

Novel 6-substituted 2-oxo-2H-1-benzopyran-3-carboxylic acid derivatives were synthesized and their potency in reducing the invasive behaviour of HT 1080 fibrosarcoma cells was evaluated. Structure ... [more ▼]

Novel 6-substituted 2-oxo-2H-1-benzopyran-3-carboxylic acid derivatives were synthesized and their potency in reducing the invasive behaviour of HT 1080 fibrosarcoma cells was evaluated. Structure-activity relationships were deduced from biological results and will be used in further design of new active compounds. In particular, the acetoxymethyl substituent found at the 6-position of previously described active compounds can be replaced by an acetamidomethyl substituent without loss of potency; while the presence of an aryl ester function at the 3-position was preferred to a thioester or an amide function to induce marked biological activity. This work confirms the interest of aryl esters of 6-substituted coumarin-3-carboxylic acids as potential new anti-cancer agents. [less ▲]

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See detailPour envisager différemment les analyses de situation
Grignard, Sophie ULg; Goudet, Bernard; Vandoorne, Chantal ULg

in Education Santé (2008), (240), 13-17

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See detailA decision problem for ultimately periodic sets in non-standard numeration systems
Charlier, Emilie ULg

Scientific conference (2008, December)

Given a linear numeration system U and a set X (include in N) such that repU(X) is recognized by a (deterministic) finite automaton. Is it decidable whether or not X is ultimately periodic, i.e., whether ... [more ▼]

Given a linear numeration system U and a set X (include in N) such that repU(X) is recognized by a (deterministic) finite automaton. Is it decidable whether or not X is ultimately periodic, i.e., whether or not X is a finite union of arithmetic progressions? Honkala showed that this problem turns out to be decidable for the usual b-ary numeration system (b greater than 2) defined by U_n = bU_{n-1} for n greater than 1 and U_0 = 1. In this work, we give a decision procedure for this problem for a large class of linear numeration systems. [less ▲]

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See detailLes techniques analytiques vertes au secours de la santé publique
Hubert, Philippe ULg

Learning material (2008)

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See detailLes troubles de l'attention – avec ou sans hyperactivité – de l'enfance à l'âge adulte. Des repères pour acquérir une clinique fine.
Scholl, Jean-Marc ULg

in Recueil Annuel d'Ergothérapie (Belgique Francophone) (2008), 1(2008), 9-23

Nous voudrions communiquer des repères cliniques clairs des troubles de l’attention avec ou sans hyperactivité. L’objectif est de mieux reconnaître ce trouble, avec plus d’objectivité. De même, nous ... [more ▼]

Nous voudrions communiquer des repères cliniques clairs des troubles de l’attention avec ou sans hyperactivité. L’objectif est de mieux reconnaître ce trouble, avec plus d’objectivité. De même, nous évoquons d'autres difficultés qui peuvent être simultanément présentes mais qui nécessitent d'en être distinguées. Nous espérons ainsi donner aux cliniciens des repères plus précis et nuancés. [less ▲]

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See detail« Dessinez la Belgique » : Représentations, perceptions et préférences fédérales d’étudiants universitaires belges francophones
Reuchamps, Min ULg; Grandjean, Geoffrey ULg; Flaba, Elodie ULg et al

Report (2008)

In an experimental design, we asked 234 French-speaking Belgian university students to “draw Belgium”. No other guidelines were given. In addition to this request, the students were asked to fill in a 19 ... [more ▼]

In an experimental design, we asked 234 French-speaking Belgian university students to “draw Belgium”. No other guidelines were given. In addition to this request, the students were asked to fill in a 19-question questionnaire about their federal perceptions and preferences as well as political and socio-demographic indicators. This experimental research is an attempt to capture the relationships between representations and perceptions of federalism in Belgium. This short preliminary report offers the first results and insight from this research. Further analyses and publications will follow. [less ▲]

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See detailLa sculpture de la façade occidentale de cathédrale de Laon : eschatologie et humanisme
Kasarska, Iliana ULg

Book published by Picard (2008)

La cathédrale de Laon comporte le plus grand ensemble sculpté de la fin du XIIe siècle: trois portails et leurs gâbles, deux fenêtres à voussures, de nombreuses têtes dans les écoinçons des baies, des ... [more ▼]

La cathédrale de Laon comporte le plus grand ensemble sculpté de la fin du XIIe siècle: trois portails et leurs gâbles, deux fenêtres à voussures, de nombreuses têtes dans les écoinçons des baies, des personnages sur les arcs-boutants et des boeufs énigmatiques aux sommets des tours du massif occidental. L’ouvrage révèle un programme d'ensemble selon lequel les thèmes des portails latéraux - Incarnation et Jugement dernier - sont couronnés et achevés par le Triomphe de la Vierge au portail central, symbole de l'espoir eschatologique des chrétiens. Ce programme est attribué à Gautier de Mortagne, évêque de Laon de 1155 à 1174. Il est amplifié par les thèmes novateurs des fenêtres - Arts libéraux et Arts mécaniques au nord, Création-Rédemption au sud – lesquels procèdent directement des écrits de Hugues de Saint-Victor (1096-1141), théologien majeur du XIIe siècle avec qui Gautier de Mortagne entretenait des relations suivies. La présence des boeufs en haut des tours peut alors s'interpréter comme une introduction oculaire à ce programme: rappel de l'apparition providentielle d'un boeuf auprès d'un ouvrier lors de la construction de la cathédrale et herméneutique de ce miracle comme conjugaison nécessaire des oeuvres humaines et de la grâce divine. Les analyses iconographique, stylistique et archéologique ont permis plusieurs découvertes : l’existence d’une chapelle axiale dans le choeur primitif (détruit au début du XIIIe siècle), le remploi d’un portail complet datant de la toute fin de l'épiscopat de Barthélemy de Joux (1113-1151) et achevé avant le début de la construction de la cathédrale actuelle. La richesse et l’originalité de cet ensemble sculpté sont servies par une couverture photographique inédite présentée sous forme de corpus dans le CD-ROM interactif qui accompagne l’ouvrage. La critique d’authenticité, complétée par l’analyse de chaque sculpture du corpus, met en évidence un nombre significatif de têtes du XIIe siècle et dénote le bon état général de la sculpture originale. L’étude stylistique, couplée à celle des techniques d’exécution, permet de distinguer les manières d’un nombre réduit d’artistes : celui du portail de remploi, celui du choeur primitif et des clefs de voûte de la nef, l’artiste principal de la façade (manière A) et des arcs-boutants de la nef, et enfin celui de la manière B de la façade. L’auteur montre que ce dernier ira ensuite accomplir le décor sculpté de l’abbatiale Saint-Yved de Braine. La chronologie du chantier conduit à remonter quelque peu la datation de la sculpture de la façade au cours du dernier quart du XIIe siècle. Laon s’intègre dans le style antiquisant, appelé par commodité << style 1200 >> et devient une référence déterminante pour Chartres, Lausanne et Maastricht. Plus largement, l’écho qu’en offrent les ensembles sculptés de Paris, Reims et Amiens font incontestablement de Laon un grand chantier européen. [less ▲]

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See detailControlled flow of smart powders
Lumay, Geoffroy ULg; Vandewalle, Nicolas ULg

in Physical Review E (2008), 78(6),

The flow properties of powders are mainly due to the interplay of cohesive forces and intergrain frictional forces. We have experimentally investigated a "smart granular system" for which the ... [more ▼]

The flow properties of powders are mainly due to the interplay of cohesive forces and intergrain frictional forces. We have experimentally investigated a "smart granular system" for which the interparticle cohesion can be tuned by a magnetic field B. We show that the rheological features of such a system can be controlled. Indeed, the granular flow can be controlled or even stopped by the magnetic field. Depending on the orientation of B, different dynamical regimes can be obtained like a "dry liquid state" forming conical droplets as well as a "layered soft state". Scaling lows are given for the flow rate outside a funnel as a function of B and for the stopping threshold of the flow as a function of the funnel output diameter D. From this analysis, it appears that the flowing properties are related to the dimensionality of the magnetic aggregates. [less ▲]

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See detailEnseigner la chimie en 1ère année de bachelier : Témoignages et réflexions
Colaux, Catherine ULg

Scientific conference (2008, December)

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See detailApproche qualité pour améliorer l’accrochage scolaire
Plunus, Ghislain ULg; Gilles, Jean-Luc ULg; Polson, Delphine ULg et al

in Education Canada (2008), 48(5), 27-29

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See detailLBG-SQUARE - Fault Tolerant, Locality-Aware Co-allocation in P2P Grids
Dethier, Gérard ULg; Briquet, Cyril ULg; Marchot, Pierre ULg et al

in Huang, Zhiyi; Xu, Zhiwei; Rountree, Nathan (Eds.) et al Ninth International Conference On Parallel And Distributed Computing, Applications And Technologies : PDCAT 2008 (2008, December)

In this paper, the deployment and execution of Iterative Stencil applications on a P2P Grid middleware are investigated. So-called Iterative Stencil applications are composed of sets of heavily ... [more ▼]

In this paper, the deployment and execution of Iterative Stencil applications on a P2P Grid middleware are investigated. So-called Iterative Stencil applications are composed of sets of heavily-communicating, long-running Tasks. They thus require co-allocation of multiple reliable resources for extended periods of time. P2P Grids are totally decentralized and provide on-demand, transparent access to edge resources, e.g. Internet-connected, non-dedicated desktop computers. A P2P Grid has the potential to provide access to a large number of resources at the fraction of the cost of a dedicated cluster. However, edge resources are heterogeneous in performance and intrinsically unreliable: Task execution failures are common due to resource preemption or resource failure. Furthermore, P2P Grid schedulers usually target sets of independent computational Tasks, i.e. so-called Bags of Tasks applications. It is therefore not trivial to deploy and run an Iterative Stencil application on a P2P Grid. Checkpointing is a common fault-tolerance mechanism in High Performance Distributed Computing, often based on a centralized architecture. Locality-aware co-allocation in P2P Grids has been recently investigated. Checkpointing and locality-aware co-allocation yet have to be integrated in P2P Grids. We propose to provide co-allocation through an existing middleware-level Bag of Tasks scheduling mechanism. We also introduce a layer of fault-tolerance for the Iterative Stencils that relies on a scalable, application-level, P2P checkpointing mechanism. Finally, LBG-SQUARE is described. This software results from the combination of a specific Iterative Stencil application (a Computational Fluid Dynamics simulation software called LaBoGrid) with a P2P Grid middleware (Lightweight Bartering Grid). [less ▲]

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See detailPanorama des imaginaires des jeunes au sujet de la société idéale
Brahy, Rachel ULg

Article for general public (2008)

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See detailest-il possible d’intégrer la fragilité gériatrique dans le risque chirurgical ?
Petermans, Jean ULg

in Revue Médicale de Liège (2008), 63(12), 722-728

Frailty in the elderly is an important factor of morbidity, particularly in the setting of surgery. The various pathologies that can lead to a functional decline are well known. The risk of mortality and ... [more ▼]

Frailty in the elderly is an important factor of morbidity, particularly in the setting of surgery. The various pathologies that can lead to a functional decline are well known. The risk of mortality and morbidity should be assessed as a function of the nature of the surgical procedure and of the disease for which it is required; the factors of severity, the predictable duration of the procedure, and the expected blood losses must also be taken into account. The thrombo-embolic risk should finally be considered. In the elderly, one may say that the functional risk matters more than the vital risk. Frailty must be integrated into the risk assessment; however, further studies are needed to better determine the impact of that new concept. Undoubtedly, the cognitive and nutritional status are of main importance. A better knowledge of the risks should lead to validate specific interventions that could help to prevent surgical complications, shorten the length of hospital stay, and protect the self-sufficiency of the aged. [less ▲]

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