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See detailCours de géologie
Poty, Edouard ULg

Learning material (2012)

Notes du cours de géologie de 1 bac en géologie et de 2 bac en géographie

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See detailLe ciel pour tous
Nazé, Yaël ULg

Article for general public (2012)

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See detailScales of spatial and temporal variations in Cryptosporidium and Giardia abundances and genetic diversity in a drinking water reservoir: implications for the risk assessment
Cauchie, Henry-Michel ULg; Burnet, Jean-Baptiste; Ogorzaly, Leslie et al

Conference (2012, February)

A monitoring of Giardia lamblia and Cryptosporidium parvum occurrence was conducted for 2 years in the largest drinking water reservoir of Luxembourg (Esch-sur-Sûre reservoir) using microscopy and qPCR ... [more ▼]

A monitoring of Giardia lamblia and Cryptosporidium parvum occurrence was conducted for 2 years in the largest drinking water reservoir of Luxembourg (Esch-sur-Sûre reservoir) using microscopy and qPCR techniques. Parasite analyses were performed on water samples collected from three sites: site A located at the inlet of the reservoir, site B located 18 km downstream site A, at the inlet of the drinking water treatment plant near the dam of the reservoir and site C where the finished drinking water is injected in the distribution network. The communication presented the main results of the survey and the assessment of risk infection with parasites. [less ▲]

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See detailOn the human pose recovery based on a single view
Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in International conference on pattern recognition applications and methods (ICPRAM) (2012, February)

Estimating the pose of the observed person is crucial for a large variety of applications including home entertainment, man-machine interaction, video surveillance, etc. Often, only a single side view is ... [more ▼]

Estimating the pose of the observed person is crucial for a large variety of applications including home entertainment, man-machine interaction, video surveillance, etc. Often, only a single side view is available, but authors claim that it is possible to derive the pose despite that humans evolve in a 3D environment. In addition, to decrease the sensitivity to color and texture, it is preferable to rely only on the silhouette to recover the pose. Under these conditions, we show that there is an intrinsic limitation: at least two poses correspond to the observed silhouette. We discuss this intrinsic limitation in details in this short paper. To our knowledge, this issue has been overlooked by authors in the past. We observe that this limitation has an impact on the way previous reported results should be interpreted, and it has clearly to be taken into account for designing new methods. [less ▲]

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See detailRetour d'expérience sur la plate-forme créative du LUCID-ULg
Leclercq, Pierre ULg

in Llerena, Daniel; Rieu, Dominique (Eds.) Innovation Connaissances et Société - Vers une société de l'innovation (2012)

Ce chapitre est consacré à la présentation d'une unité de recherche universitaire originale, appelée le LUCID, créé en 2001 à l'Université de Liège (Belgique). Elle figure ici comme une expérience ... [more ▼]

Ce chapitre est consacré à la présentation d'une unité de recherche universitaire originale, appelée le LUCID, créé en 2001 à l'Université de Liège (Belgique). Elle figure ici comme une expérience partagée, créée autour de la notion d'innovation et menée avec une approche pluridisciplinaire centrée utilisateur et articulée autour des nouvelles technologies. Dès sa fondation, cette petite structure, très dynamique, a développé un savoir-faire spécifique, rapidement remarqué dans le domaine de l'ingénierie de conception, qui lui vaut d'être régulièrement citée et appelée à participer à des projets innovants. Parallèlement à ses projets, elle conduit une réflexion sur ses propres processus de création qu'elle cherche sans cesse à maîtriser et à diversifier. A l'invitation de l'Institut de l'Innovation INNOVACS de Grenoble, c'est une synthèse de cette analyse qui est proposée ici dans une perspective pratique, pas nécessairement reproductible mais potentiellement porteuse pour celles et ceux qui s'interrogent sur les méthodes opérationnelles de gestion de l'innovation. Ce chapitre est articulé en trois parties. Il présente d'abord l'équipe et quelques-uns de ses projets; il montre ensuite comment elle s'est organisée en termes de ressources humaines et logistiques; enfin, il propose une analyse rétroactive, permettant d'inspirer éventuellement d'autres contextes. [less ▲]

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See detail« Spaßmacher » et « Ernstmacher » en poésie allemande. Les poèmes profanes de Robert Gernhardt.
Viehöver, Vera ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

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See detailA Finite Element Subproblem Method for Position Change Conductor Systems
Dular, Patrick ULg; Krähenbühl, Laurent; Vazquez Sabariego, Ruth ULg et al

in IEEE Transactions on Magnetics (2012), 48(2), 403-406

Analyses of magnetic systems with position changes of both massive and stranded conductors are performed via a finite element sub- problem method. A complete problem is split into subproblems associated ... [more ▼]

Analyses of magnetic systems with position changes of both massive and stranded conductors are performed via a finite element sub- problem method. A complete problem is split into subproblems associated with each conductor and the magnetic regions. Each complete solution is then expressed as the sum of subproblem solutions supported by different meshes. The subproblem procedure simplifies both meshing and solving processes, with no need of remeshing, and accurately quantifies the effect of the position changes of conductors on both local fields, e.g., skin and proximity effects, and global quantities, e.g., inductances and forces. Applications covering parameterized analyses on conductor positions to moving conductor systems can benefit from the developed approach. [less ▲]

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See detailElectromagnetic absorption properties of carbon nanotube nanocomposite foam filling honeycomb waveguide structures
Quiévy, Nicolas; Bollen, Pierre; Thomassin, Jean-Michel ULg et al

in IEEE Transactions on Electromagnetic Compatibility (2012), 24(1), 43-51

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential ... [more ▼]

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential. Electromagnetic modeling and experimental characterization of the hybrids proved that the honeycomb, acting as a hexagonal waveguide, improves the absorption properties in the gigahertz range above the cutoff frequency. The electromagnetic absorption can be tuned by changing the hybrid material properties. The required levels of electrical conductivity are attained owing to the dispersion of low amounts (1–2 wt%) of carbon nanotubes inside the polymermatrix. The combination of the foam and honeycomb architecture contributes to decrease the real part of the relative effective permittivity Re{εr,eff }. Varying the cell shape of the honeycomb changes the frequency range for high absorption. An analytical model for the absorption has been developed, showing good agreement with the experimental results. [less ▲]

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See detailRhino vs paquebot: 1-0
Hamers, Jérémy ULg

Article for general public (2012)

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See detailQuantifications en supergéométrie
Leuther, Thomas ULg

Poster (2012, February)

Le poster présente de façon vulgarisée certaines idées sous-jacentes à la recherche de quantifications invariantes en supergéométrie.

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See detailLearning to play K-armed bandit problems
Maes, Francis ULg; Wehenkel, Louis ULg; Ernst, Damien ULg

in Proceedings of the 4th International Conference on Agents and Artificial Intelligence (ICAART 2012) (2012, February)

We propose a learning approach to pre-compute K-armed bandit playing policies by exploiting prior information describing the class of problems targeted by the player. Our algorithm first samples a set of K ... [more ▼]

We propose a learning approach to pre-compute K-armed bandit playing policies by exploiting prior information describing the class of problems targeted by the player. Our algorithm first samples a set of K-armed bandit problems from the given prior, and then chooses in a space of candidate policies one that gives the best average performances over these problems. The candidate policies use an index for ranking the arms and pick at each play the arm with the highest index; the index for each arm is computed in the form of a linear combination of features describing the history of plays (e.g., number of draws, average reward, variance of rewards and higher order moments), and an estimation of distribution algorithm is used to determine its optimal parameters in the form of feature weights. We carry out simulations in the case where the prior assumes a fixed number of Bernoulli arms, a fixed horizon, and uniformly distributed parameters of the Bernoulli arms. These simulations show that learned strategies perform very well with respect to several other strategies previously proposed in the literature (UCB1, UCB2, UCB-V, KL-UCB and $\epsilon_n$-GREEDY); they also highlight the robustness of these strategies with respect to wrong prior information. [less ▲]

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See detailEvolution et systématique du genre Pinus
Toussaint, André ULg

in Annales de la Société Belge de Dendrologie = Jaarboek van de Belgische Dendrologische Vereniging (2012), 2010

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See detailLe portail de Mont-devant-Sassey : aspects iconographiques
Lekane, Marie ULg

in Conroy, Jean-François (Ed.) Actes du 11ème colloque international étudiant du Département d'histoire de l'Université Laval (2012, February)

Le portail sculpté méridional de Mont-devant-Sassey est intéressant à plus d’un titre. Premièrement, il est le portail gothique lorrain le mieux conservé qui soit, comme la critique d’authenticité le ... [more ▼]

Le portail sculpté méridional de Mont-devant-Sassey est intéressant à plus d’un titre. Premièrement, il est le portail gothique lorrain le mieux conservé qui soit, comme la critique d’authenticité le confirme. Ensuite, certains des choix iconographiques effectués par le « commanditaire » sont surprenants, inusités, voire inédits. Enfin, en raison de sa situation géographique char- nière entre le domaine français et l’Empire germanique, les sculpteurs ont pu profiter des innovations sculpturales introduites tant à l’ouest qu’à l’est et les combiner de manière originale. Le présent article est l’occasion de renouveler l’identification iconographique de certaines figures, de proposer une datation de l’ensemble et de suggérer les transferts artistiques attestés par le portail (réception de formules iconographiques et stylistiques mises en place dans des grands centres). [less ▲]

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See detailOptimization of particle packing by analytical and computer simulation approaches
He, Huan ULg; Stroeven, Piet; Stroeven, Martijn et al

in Computers and Concrete (2012), 9(2), 119-131

Optimum packing of aggregate is an important aspect of mixture design, since porosity may be reduced and strength improved. It may also cause a reduction in paste content and is thus of economic relevance ... [more ▼]

Optimum packing of aggregate is an important aspect of mixture design, since porosity may be reduced and strength improved. It may also cause a reduction in paste content and is thus of economic relevance too. Several mathematic packing models have been developed in the literature for optimization of mixture design. However in this study, numerical simulation will be used as the main tool for this purpose. A basic, simple theoretical model is used for approximate assessment of mixture optimization. Calculation and simulation will start from a bimodal mixture that is based on the mono-sized packing experiences. Tri-modal and multi-sized particle packing will then be discussed to find the optimum mixture. This study will demonstrate that computer simulation is a good alternative for mixture design and optimization when appropriate particle shapes are selected. Although primarily focusing on aggregate, optimization of blends of Portland cement and mineral admixtures could basically be approached in a similar way. [less ▲]

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