Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailGeneralized power method for sparse principal component analysis
Nesterov, Yurii; Richtarik, Peter; Journee, Michel ULg et al

in Journal of Machine Learning Research (2010), 11

Detailed reference viewed: 123 (34 ULg)
Full Text
See detailTransfert des méthodes analytiques
Rozet, Eric ULg; Hubert, Philippe ULg

Learning material (2010)

Un transfert analytique est un processus complet qui consiste à transférer physiquement une méthode analytique préalablement validée d’un laboratoire émetteur à un laboratoire receveur mais aussi et ... [more ▼]

Un transfert analytique est un processus complet qui consiste à transférer physiquement une méthode analytique préalablement validée d’un laboratoire émetteur à un laboratoire receveur mais aussi et surtout à s’assurer que ce dernier maîtrise cette méthode dans son environnement. Ces transferts de méthodes analytiques sont pleinement inclus dans le développement de nouveaux produits chimiques, pharmaceutiques, cosmétiques, agroalimentaires… En effet, la progression des produits de R&D vers les opérations industrielles et leur commercialisation nécessite le transfert des méthodes de contrôle de production. D’autre part, des contraintes socio-économiques particulières impliques le transfert de méthodes analytiques, telles que la rationalisation des sites de fabrication, la sous-traitance analytique, les achats/ventes de produits en cours de développement et la consolidation/fusion des groupes pharmaceutiques. [less ▲]

Detailed reference viewed: 278 (23 ULg)
Full Text
Peer Reviewed
See detailAn Improved Methodology for Filling Missing Values in Spatiotemporal Climate Dataset: Application to Tanganyika Lake Dataset
Sorjamaa, Antti; Lendasse, Amaury; Cornet, Yves ULg et al

in Computational Geosciences (2010), 14(1), 55-64

In this paper, an improved methodology for the determination of missing values in a spatio-temporal database is presented. This methodology performs denoising projection in order to accurately fill the ... [more ▼]

In this paper, an improved methodology for the determination of missing values in a spatio-temporal database is presented. This methodology performs denoising projection in order to accurately fill the missing values in the database. The improved methodology is called EOF Pruning and it is based on an original linear projection method called Empirical Orthogo- nal Functions (EOF). The experiments demonstrate the performance of the improved methodology and present a comparison with the original EOF and with a widely-used Optimal Interpolation method called Objective Analysis. [less ▲]

Detailed reference viewed: 93 (20 ULg)
Full Text
Peer Reviewed
See detailA Platform for High Performance and Flexible Virtual Routers on Commodity Hardware
Egi, Norbert; Greenhalgh, Adam; Handley, Mark et al

in ACM SIGCOMM Computer Communication Review (2010, January)

Multi-core CPUs, along with recent advances in memory and buses, render commodity hardware a strong candidate for software router virtualization. In this context, we present the design of a new platform ... [more ▼]

Multi-core CPUs, along with recent advances in memory and buses, render commodity hardware a strong candidate for software router virtualization. In this context, we present the design of a new platform for virtual routers on modern PC hardware. We further discuss our design choices in order to achieve both high performance and flexibility for packet processing. [less ▲]

Detailed reference viewed: 56 (1 ULg)
Full Text
See detailRecent developments in simulation, optimization and control of flexible multibody systems
Bruls, Olivier ULg

Scientific conference (2010, January)

This talk addresses some recent extensions of the finite element approach for the analysis, design and control of flexible mechanisms. A particular attention is devoted to modular simulation concepts ... [more ▼]

This talk addresses some recent extensions of the finite element approach for the analysis, design and control of flexible mechanisms. A particular attention is devoted to modular simulation concepts, advanced time integration methods, efficient sensitivity analysis and topology optimization problems. Practical applications of those techniques can be found in various fields of engineering, e.g. in automotive engineering (vehicle suspensions, powertrains), aerospace engineering (landing gears, flaps, deployable space structures), robotics, machine tools, biomechanics or biomedical instruments. Firstly, an integrated simulation approach will be presented for articulated systems composed of rigid bodies, flexible bodies, kinematic joints, actuators, sensors and control units. I will focus on some numerical aspects concerning the time integration of the equations of motion which have the structure of strongly coupled differential-algebraic equations on a Lie group. The treatment of large rotation variables and the coupling between control state variables and mechanical generalized coordinates will be discussed in more detail. Secondly, based on this simulation tool, a particular class of optimization problems in multibody dynamics will be considered, i.e. the topology optimization of structural components. Generally, topology optimization techniques use simplified quasi-static load cases to mimic the complex dynamic loadings in service. In contrast, I will present an optimization procedure which properly accounts for the actual dynamic interactions which occur during the motion of the flexible multibody system. The method relies on an efficient sensitivity analysis based on a semi-analytical direct differentiation approach. In order to illustrate the benefits of the proposed design approach, the optimization of a two degrees-of-freedom robot arm with flexible truss linkages will be analyzed. Finally, I will discuss some perspectives for the integrated control-structure optimization of multibody systems. [less ▲]

Detailed reference viewed: 71 (4 ULg)
Full Text
Peer Reviewed
See detailGCXGC coupled to fast scanning quadrupole MS for trace analysis of POPs
Kinet; De Pauw, Edwin ULg; Focant, Jean-François ULg

in Book of abstracts (2010, January)

Detailed reference viewed: 15 (1 ULg)
Full Text
Peer Reviewed
See detailA ‘cook book’ method for dioxin analysis
Focant, Jean-François ULg; Shirkhan; Patterson Jr

in Book of abstract (2010, January)

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailPrise en charge pluridisciplinaire d'une parodontite juvénile: Traitement Paro-Ortho-Prothétique
LAMBERT, France ULg; ROMPEN, Eric ULg

in Le point (2010), 218(Janvier -Février), 27-30

Detailed reference viewed: 59 (4 ULg)
Full Text
Peer Reviewed
See detailNumerical Modelling of Thin-Walled Stainless Steel Structural Elements in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Simoes da Silva, Luís et al

in Fire Technology (2010), 46(1), 91-108

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program ... [more ▼]

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program SAFIR, including imperfections. In order to make these simulations, two main changes in the program were made: (i) the code was changed in order to deal with the stainless steel 2D material constitutive law to be used with shell elements and (ii) the possibility of the program to take into account residual stresses with shell finite elements was introduced. The stainless steel stress–strain relationship at high temperatures was based on the one presented in part 1.2 of Eurocode 3. To model the strain hardening exhibited by the stainless steels, using the shell element formulation, an approximation to the Eurocode 3 constitutive law was needed. Local and global geometrical imperfections were considered in the simulations. The paper shows the influence of the residual stresses on the ultimate load-carrying capacity of thin-walled stainless steel structural elements in case of fire. [less ▲]

Detailed reference viewed: 79 (9 ULg)
Full Text
See detailRiddles and Counterpoint: Mozart's Pupil Franz Jacob Freystädtler
Steyaert, Kris ULg; Sprague, Catherine

in Newsletter of the Mozart Society of America (2010), XIV(1), 14-17

Detailed reference viewed: 94 (13 ULg)
Full Text
Peer Reviewed
See detailAnthropogenic and naturally-produced organobrominated compounds in marine mammals from Brazil
Dorneles, Paulo R; Lailson-Brito, José; Dirtu, Alin C et al

in Environment International (2010), 36(1), 60-67

Liver samples from 51 cetaceans, comprising 10 species, stranded between 1994 and 2006 in a highly industrialized and urbanized region in Southeast Brazil, were analyzed for polybrominated diphenyl ethers ... [more ▼]

Liver samples from 51 cetaceans, comprising 10 species, stranded between 1994 and 2006 in a highly industrialized and urbanized region in Southeast Brazil, were analyzed for polybrominated diphenyl ethers (PBDEs) and methoxylated-PBDEs (MeO-PBDEs). A concentration range of PBDEs (3-5960 ng/g lw) similar to that observed in Northern Hemisphere dolphins was found. MeO-PBDE concentrations in continental shelf (CS) dolphins from Brazil are among the highest detected to date in cetaceans (up to 250 µg/g lw). Higher [Sigma]MeO-PBDE concentrations were measured in CS and oceanic dolphins than in estuarine dolphins. The [Sigma]PBDE/[Sigma]MeO-PBDE ratio varied significantly ranging from a mean value of 7.12 to 0.08 and 0.01 for estuarine, CS and oceanic species, respectively. A positive correlation was observed between [Sigma]PBDE and year of stranding of male estuarine dolphins (Sotalia guianensis), which suggests temporal variation in the exposure. Placental transfer of organobrominated compounds was also evidenced in S. guianensis. [less ▲]

Detailed reference viewed: 66 (12 ULg)
Full Text
Peer Reviewed
See detailADDICTION AU MMORPG : QUAND LE REEL EST SOUS L’EMPRISE DU VIRTUEL
Bataille, Stéphanie; Triffaux, Jean-Marc ULg

Poster (2010, January)

Detailed reference viewed: 214 (6 ULg)
Full Text
See detailRéanimation aux urgences pédiatriques
Battisti, Oreste ULg; Brasseur, Edmond ULg; D'Orio, Vincenzo ULg et al

Learning material (2010)

précis des principales situations aux urgences pédiatriques

Detailed reference viewed: 213 (46 ULg)
Full Text
See detailEtude des habitats utilisés par le Pic mar en Région wallonne à partir des données de l'inventaire forestier
Lehaire, François ULg; Paquet, Jean-Yves; Monticelli, David et al

in Forêt Wallonne (2010), (104), 50-61

Le Pic mar est une espèce-clé de nos forêts feuillues. Il apparaît généralement comme étant un indicateur des forêts de grande valeur biologique. Autrefois cantonné dans les grands massifs feuillus ... [more ▼]

Le Pic mar est une espèce-clé de nos forêts feuillues. Il apparaît généralement comme étant un indicateur des forêts de grande valeur biologique. Autrefois cantonné dans les grands massifs feuillus d’Ardenne et de Gaume, il a remarquablement étendu son aire à toute la Wallonie lors des deux dernières décennies. L’étude de cette aire d’extension récente devrait nous permettre de mieux apprécier ses exigences écologiques dans un habitat encore peu ou mal connu et pourrait ouvrir des portes vers des recommandations de gestion forestière plus précises quant aux pics et leur biodiversité associée. [less ▲]

Detailed reference viewed: 129 (43 ULg)
Full Text
Peer Reviewed
See detailLes usagers, au coeur de la "modernisation" de la justice belge?
Lejeune, Aude ULg

in Revue Nouvelle (2010), 65(1), 61-67

La Justice joue à la fois le rôle de service public et de pouvoir judiciaire qui exerce des prérogatives de la puissance publique, et la définition même de ses « usagers » est polysémique. L’analyse des ... [more ▼]

La Justice joue à la fois le rôle de service public et de pouvoir judiciaire qui exerce des prérogatives de la puissance publique, et la définition même de ses « usagers » est polysémique. L’analyse des multiples acceptions du terme permet de souligner les enjeux des réformes en cours. La création des maisons de justice à la fin des années nonante illustre de manière exemplaire le recours à la rhétorique des usagers, placés au coeur de la « modernisation » de l’institution judiciaire ainsi que les enjeux liés à la définition du contenu de cette notion. De manière plus générale, ce recours à l’usager lance un nouveau défi à l’institution judiciaire, amenée à se positionner par rapport aux questions de « modernisation » et de management, sans négliger pour autant les risques qu’engendrerait une banalisation de la fonction de Justice. [less ▲]

Detailed reference viewed: 116 (28 ULg)
Full Text
Peer Reviewed
See detailSingle nucleotide differences (SNDs) in the dbSNP database may lead to errors in genotyping and haplotyping studies.
Musumeci, Lucia ULg; Arthur, Jonathan; Cheung, Florence et al

in Human Mutation (2010), 31(1), 63-73

The creation of single nucleotide polymorphism (SNP) databases (such as NCBI dbSNP) has facilitated scientific research in many fields. SNP discovery and detection has improved to the extent that there ... [more ▼]

The creation of single nucleotide polymorphism (SNP) databases (such as NCBI dbSNP) has facilitated scientific research in many fields. SNP discovery and detection has improved to the extent that there are over 17 million human reference (rs) SNPs reported to date (Build 129 of dbSNP). SNP databases are unfortunately not always complete and/or accurate. In fact, half of the reported SNPs are still only candidate SNPs and are not validated in a population. We describe the identification of SNDs (single nucleotide differences) in humans, that may contaminate the dbSNP database. These SNDs, reported as real SNPs in the database, do not exist as such, but are merely artifacts due to the presence of a paralogue (highly similar duplicated) sequence in the genome. Using sequencing we showed how SNDs could originate in two paralogous genes and evaluated samples from a population of 100 individuals for the presence/absence of SNPs. Moreover, using bioinformatics, we predicted as many as 8.32% of the biallelic, coding SNPs in the dbSNP database to be SNDs. Our identification of SNDs in the database will allow researchers to not only select truly informative SNPs for association studies, but also aid in determining accurate SNP genotypes and haplotypes. [less ▲]

Detailed reference viewed: 47 (0 ULg)
Full Text
Peer Reviewed
See detailA fast gas chromatographic method for the study of semiochemical slow release formulations
Heuskin, Stéphanie ULg; Lorge, Stéphanie; Leroy, Pascal ULg et al

Poster (2010, January)

Detailed reference viewed: 33 (7 ULg)
Full Text
Peer Reviewed
See detailLa prison, entre crise et modernisation
Dubois, Christophe ULg

in Revue Nouvelle (2010)

L’actualité médiatique de ces derniers mois a relaté plusieurs cas de désordres survenus dans nos prisons : actes de violence, grève du personnel, évasions, suicides, mutineries, etc. Derrière ces ... [more ▼]

L’actualité médiatique de ces derniers mois a relaté plusieurs cas de désordres survenus dans nos prisons : actes de violence, grève du personnel, évasions, suicides, mutineries, etc. Derrière ces indicateurs de crise, on peut également déceler les traces, de plus en plus nombreuses, d’un vaste chantier de modernisation dans lequel l’administration pénitentiaire s’est engagée, comme l’indiquent le plan de management initié par le directeur général, la reconfiguration de la profession de directeur ou encore l’introduction de notions managériales dans les discours de ces derniers. Les expériences anglaises et néerlandaises offrent une perspective décentrée pour saisir les opportunités de changement que permettent (ou non) les crises et le Nouveau Management Public. Nous proposons ici de nous inspirer de ces expériences pour en extraire quelques pistes de réflexion à propos de notre administration pénitentiaire. [less ▲]

Detailed reference viewed: 204 (39 ULg)
Full Text
Peer Reviewed
See detailChemical contamination in fish species from rivers in the North of Luxembourg: Potential impact on the Eurasian otter (Lutra lutra).
Boscher, Aurore; Gobert, Sylvie ULg; Guignard, C. et al

in Chemosphere (2010), 78

Contamination levels of PCBs, and of the heavy metals cadmium (Cd), lead (Pb) and mercury (Hg) were analyzed in four fish species from seven rivers in the North of Luxembourg. During August and September ... [more ▼]

Contamination levels of PCBs, and of the heavy metals cadmium (Cd), lead (Pb) and mercury (Hg) were analyzed in four fish species from seven rivers in the North of Luxembourg. During August and September 2007, 85 samples of fish were collected belonging to four species: the stone loach (Barbatula barbatula, n = 12 pools), the chub (Squalius cephalus, n = 36), the barbel (Barbus barbus, n = 23) and eel (Anguilla anguilla, n = 14). The concentration of seven indicator PCBs (P7PCBs) reached a mean of 39 ng g􏰀1 and varied between 4.0 and 346.2 ng g􏰀1 (wet wt) depending on the site and species. Fish collected at Wal- lendorf on the Our River and sites on the Wiltz and the Clerve rivers showed the highest concentrations for PCBs. In comparison with 1994, PCB levels in fish decreased strongly during the last decade in these rivers. Lead was detected at low levels (0–181.4 ng g􏰀1 wet wt). Mercury concentrations ranged between 10.3 and 534.5ngg􏰀1 (wet wt) exceeding maximum tolerable levels for human consumption of 500 ng g􏰀1 in two fish out of 85. Chubs and eels from the Sûre River were the most contaminated by mer- cury. Cadmium levels varied between 4.0 and 103.9 ng g􏰀1 (wet wt). In addition to mercury in fish, cad- mium was the most problematic pollutant on the Our, the Wiltz, the Clerve and the Troine Rivers, because values found in 20% of fish exceeded the threshold of about 10–50 ng g􏰀1 (wet wt) recommended for human health. The total PCB level predicted to accumulate in livers from otter potentially feeding on these fish based on a previously published mathematical model is 37.7 lg g􏰀1 (lipid wt), which is between a proposed ‘‘safe level” and a ‘‘critical level” for otters. Rivers in the North of Luxembourg are thus to some extent polluted, and the establishment of otter populations could be affected by current levels of contamination. [less ▲]

Detailed reference viewed: 30 (7 ULg)