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See detailChildcare centres open to every child and his family : a guarantee to increase quality
Camus, Pascale ULg

Conference (2010, July 13)

Everyone should have the possibility to benefit from an ECEC service where his / her needs are recognized and given individual attention. For the last years, several laws have been issued to facilitate ... [more ▼]

Everyone should have the possibility to benefit from an ECEC service where his / her needs are recognized and given individual attention. For the last years, several laws have been issued to facilitate inclusion of children with special needs in the French Community of Belgium, but laws are not sufficient. The point is to think about constructive conditions necessary to welcome daily every child and family. A group of professionals has gathered to share experiences and define options to share competencies, knowledge and experiences in order to give opportunities to everybody to feel welcome in the service, in regards to his / her competencies, interests, possibilities. A main hypothesis that has been examined: an individual care to a child with special needs can transform positively the whole ECEC service and improve quality conditions for everybody. Indeed quality depends both on pedagogical choices made (what is daily proposed to children and their family ?) and on the beneficiaries of the service (who are the children and the family welcomed ?). In the part of the symposium focused on the French Community of Belgium, the results of worshops (increasing partnership with families, giving a place to each child, building a network …) have been discussed. [less ▲]

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See detailReconstruction of missing data in satellite and in situ data sets with DINEOF (Data Interpolating Empirical Orthogonal Functions)
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

Conference (2010, July 12)

DINEOF (Data Interpolating Empirical Orthogonal Functions), a method to reconstruct missing data in geophysical data sets, is presented. Based on a truncated Empirical Orthogonal Functions (EOF) basis ... [more ▼]

DINEOF (Data Interpolating Empirical Orthogonal Functions), a method to reconstruct missing data in geophysical data sets, is presented. Based on a truncated Empirical Orthogonal Functions (EOF) basis, DINEOF uses an iterative procedure to calculate the values at the missing locations. A clear advantage of DINEOF is that no aprioriate knowledge about the statistics of the data set being reconstructed is needed (such as covariance or correlation length): the EOF basis is used internally to infer necessary information about the data, so no estimation of those parameters is needed. This characteristic is specially interesting for heterogeneous data distributions for which is difficult to derive this information. Also obtained are estimations of the error covariance of the reconstructed field, and outliers, i.e. data that present anomalous values with respect to the surrounding information in the original data, for which the residuals are larger than the statistically expected misfit calculated during the analysis. When very few data is available, the estimated covariance between two successive images used in the EOF calculation might not sufficiently robust. As a consequence, spikes appear in the temporal EOFs, which result in unrealistic discontinuities in the reconstruction. A temporal filter has been applied to the covariance matrix used to determined the EOFs, which effectively enhance temporal continuity. This has been applied to a SST data set of the Black Sea and the reconstruction error is estimated by cross-validation. On-going work includes the development of a merging capability within DINEOF that will allow to blend data from different platforms (satellite and in situ data). [less ▲]

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See detailWorking on a Method to Compute Inverse of Genomic Relationship Matrix from Sparse Matrices
Faux, Pierre ULg; Misztal, Ignacy; Gengler, Nicolas ULg

Conference (2010, July 12)

Genomic relationships matrix (G) are dense matrices used in genomic prediction of dairy cattle. As the number of genotyped animals will increase, an approximation of the inverse of genomic relationships ... [more ▼]

Genomic relationships matrix (G) are dense matrices used in genomic prediction of dairy cattle. As the number of genotyped animals will increase, an approximation of the inverse of genomic relationships matrix is needed. We have developed a method based on a decomposition of G similar to decomposition of additive relationships matrix A. The method of inversion is tested on a set of simulated data. [less ▲]

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See detailA simulation approach for analyzing genomic data using a package of specific FORTRAN90 functions
Faux, Pierre ULg; Gengler, Nicolas ULg

Conference (2010, July 12)

A panel of FORTRAN 90 functions was developed to simulate the distribution of bi-allelic (e.g., SNP) genetic markers along a defined genome and the distribution of their alleles in a given population. The ... [more ▼]

A panel of FORTRAN 90 functions was developed to simulate the distribution of bi-allelic (e.g., SNP) genetic markers along a defined genome and the distribution of their alleles in a given population. The simulation program used 3 parameters, those related to the species studied (number of autosomes, average length of autosomes, average number of crossovers by chromosome), the number of markers and those related to the studied population (pedigree). The simulation proceeds in 3 steps: a) random choice of marker positions and allelic frequencies for the minor allele of each marker (range: 0.05 to 0.475), b) simulation of genotypes of the ancestors in the pedigree based on randomly chosen allelic frequencies and c) planned mating of the ancestors according to the pedigree and according to the average crossover rate as a genetic recombination parameter. The simulation returns a fully-genotyped population. This method is flexible because it can be applied to a wide range of cases (not restricted to a single species) and the FORTRAN functions can be extended and used to simulate phenotypes. It is also realistic, because it performs mating plans and selection of animals based on real pedigrees. Development of this simulation panel was the first step in research around advanced methods to compute and invert genomic relationship matrices. [less ▲]

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See detailMolecular Elasticity of a Mechanically-Linked Polymer
Lussis, Perrine ULg; Fustin, C.-A; Van Quaethem, A et al

Conference (2010, July 11)

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See detailSynthesis and characterization of highly loaded Pt/carbon xerogel catalysts prepared by Strong Electrostatic Adsorption method
Job, Nathalie ULg; Maillard, F.; Chatenet, M. et al

Conference (2010, July 11)

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See detailA Bilevel Competitive Facility Location Model with Competitor’s Response
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

Conference (2010, July 11)

We are concerned with a problem in which a new entrant leader firm aims at finding the location and attractiveness of each new facility to maximize its profit where there are existing facilities belonging ... [more ▼]

We are concerned with a problem in which a new entrant leader firm aims at finding the location and attractiveness of each new facility to maximize its profit where there are existing facilities belonging to a competitor. The competitor reacts to the leader by adjusting the attractiveness levels of its existing facilities to maximize its profit. We first formulate a bilevel mixed-integer nonlinear programming model. Then, we convert it into an equivalent single level mixed-integer nonlinear program and solve it using global optimization methods. [less ▲]

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See detailUtilité des composés organiques volatils (COVs) émis par les Diptères nécrophages dans l’estimation de l’intervalle post mortem.
Frederickx, Christine ULg; Dekeirsschieter, Jessica ULg; Verheggen, François ULg et al

Conference (2010, July 09)

L’entomologie forensique s’intéresse à l’étude des insectes et d’autres arthropodes permettant d’estimer la période écoulée entre le décès d’une victime et la découverte du corps, encore appelée ... [more ▼]

L’entomologie forensique s’intéresse à l’étude des insectes et d’autres arthropodes permettant d’estimer la période écoulée entre le décès d’une victime et la découverte du corps, encore appelée intervalle post mortem ou IPM. Actuellement, cet intervalle post mortem est estimé après élevage en laboratoire des œufs, des larves et des pupes des Diptères nécrophages prélevés sur la scène de crime. Afin d’éviter cette mise en élevage, il est possible d’estimer l’âge des pupes de Diptères. A cette fin, nous avons prélevé par microextraction sur phase solide (SPME) les composés organiques volatils émis par les pupes de Diptères tout au long de leur pupaison. Ces composés organiques volatiles sont ensuite analysés par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC-MS). Ces analyses permettront d’une part d’estimer l’IPM plus justement et d’autre part de visualiser l’évolution des composés organiques volatiles émis par les pupes de Diptères nécrophages au cours de leur pupaison. [less ▲]

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See detailEvaluer les compétences : la place du contexte.
Bertrand, Françoise ULg; Tibax, V.; Hansez, Isabelle ULg

Conference (2010, July 09)

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See detailAgrifutur : se former pour demain.
Babic, Audrey ULg; Peters, Stéphanie ULg; Côte, Virginie et al

Conference (2010, July 09)

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See detailSurveillance de l'entomofaune des associations culturales prenant en compte le safoutier (Dacryodes edulis, (G. Don) H.J. Lam ; Burseraceae) dans le haut-Ogooué au Gabon
Poligui, René Noël ULg

Conference (2010, July 08)

Malgré le nombre assez élevé d’études sur les insectes des cultures au niveau de l’Afrique centrale, il y a peu d’informations sur l’entomofaune des associations culturales intégrant le safoutier ... [more ▼]

Malgré le nombre assez élevé d’études sur les insectes des cultures au niveau de l’Afrique centrale, il y a peu d’informations sur l’entomofaune des associations culturales intégrant le safoutier (Dacryodes edulis, Burseraceae). Dans ce contexte, pendant seize semaines continues, nous avons effectué des observations diverses sur le terrain au niveau du Haut-Ogooué, au du Gabon. Les associations culturales des jardins des cases ont été caractérisées. Des insectes ont été évalués, respectivement 8611 individus pour 74 familles au moyen du contrôle visuel hebdomadaire sur le safoutier, 21753 individus pour 181 familles à partir des collectes hebdomadaires des pièges autour du safoutier, et 19196 individus pour 178 familles à partir des pièges des espaces témoins. Les résultats de ce travail révèlent que la diversité et les abondances de l’entomofaune de ce milieu évoluent en fonction des conditions climatiques, de la phénologie floricole du safoutier et de la nature de l’écosystème. Les pièges autour des safoutiers capturent plus d’insectes que ceux des espaces sans safoutiers. La diversité et les abondances sont plus importantes en milieu rural qu’en milieu urbain. Selon leur statut alimentaire, les insectes nuisibles sont les plus nombreux, viennent ensuite les insectes utiles et les insectes associés. Des espèces ayant une importance économique sur le safoutier ont été observées. Des observations ultérieures permettront de confirmer et de mieux cerner les ravageurs majeurs de ces associations, et de réaliser des investigations scientifiques sur les techniques de lutte biologique. [less ▲]

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See detailSustainable steel constructions – Life-cycle inventory, methods and applications
Rossi, Barbara ULg

Conference (2010, July 07)

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of ... [more ▼]

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of steel as a sustainable material, the principles of a life-cycle analysis are presented. The paper then focuses on the life-cycle inventory data of several products: finished cold-rolled coil, electro-galvanized steel, section rolling and rebar. The data are presented for two (sometimes three) different recycling rates. Indeed, since steel is recycled to more than 85% at the end of its life and recyclable and indefinite number of times, the presented inventory includes allocation for scrap inputs and outputs using the closed material loop recycling methodology developed by the International Iron and Steel Institute (IISI). A description of the method principles is also provided. The influence of the end-of-life credit method will be discussed. Corrosion and subsequently maintenance of steel products will be treated afterwards and a brief comparison of the life-cycle inventory will be provided for electro-galvanized steel and finished steel. [less ▲]

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See detailThe Ramses Project: Review and Perspectives
Honnay, Anne-Claude ULg; Polis, Stéphane ULg; Winand, Jean ULg

Conference (2010, July 07)

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See detailUne intervention de formation examinée et développée à l’aide d’un cadre conceptuel issu du croisement des approches ergonomiques et psychosociologiques
Burlet, Géraldine; Faulx, Daniel ULg

Conference (2010, July 06)

La contribution étudie les effets d’une intervention de formation fondée sur l’articulation des cadres conceptuels de la psychologie sociale et du socio-constructivisme, en l’occurrence un « dispositif ... [more ▼]

La contribution étudie les effets d’une intervention de formation fondée sur l’articulation des cadres conceptuels de la psychologie sociale et du socio-constructivisme, en l’occurrence un « dispositif d’immersion structuré » (DIS). L’analyse de l’impact de cette intervention, qui poursuit à la fois des objectifs cognitifs, identitaires et comportementaux, est fondée sur l’analyse thématique et structurale de contenu de 25 entretiens, et montre que le DIS a eu des effets conformes aux objectifs poursuivis par l’intervention, et cela aux trois niveaux : (1) des apprentissages sur les manières de fonctionner et de travailler d’autres services, (2) l’accroissement des comportements de coopération entre services, (3) le développement du sentiment d’appartenance organisationnelle. [less ▲]

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See detailImpact de la longueur des énoncés et de la fréquence lexicale sur la compréhension d’énoncés chez des enfants
Leclercq, Anne-Lise ULg; Majerus, Steve ULg; Maillart, Christelle ULg

Conference (2010, July 06)

Introduction En psychologie cognitive, plusieurs modèles théoriques considèrent que le système de traitement de l’information humain a une capacité limitée (notamment, Just & Varma, 2007). L’efficacité ... [more ▼]

Introduction En psychologie cognitive, plusieurs modèles théoriques considèrent que le système de traitement de l’information humain a une capacité limitée (notamment, Just & Varma, 2007). L’efficacité lors d’activités recrutant un grand nombre de traitements cognitifs serait dépendante de la quantité de ressources disponibles pour les réaliser. En particulier, l’activité de compréhension d’énoncés nécessite la réalisation rapide et quasi simultanée d’un grand nombre de traitements, dont l’analyse morphosyntaxique à proprement parler, mais également le décodage phonologique et l’accès lexical. En outre, d’autres processus cognitifs interviennent, comme l’attention portée à la tâche ou la mémoire de travail qui permet la coordination entre le traitement de l’énoncé et le stockage des produits partiels de celui-ci. Selon le modèle de compréhension d’énoncés de Just & Carpenter (1992), les ressources disponibles doivent être réparties entre le stockage des éléments traités et l’analyse et l’intégration des éléments à traiter. Selon ces auteurs, certaines opérations sont plus coûteuses que d’autres. Par exemple, le traitement de lexèmes de basse fréquence lexicale serait plus coûteux que le traitement de lexèmes fréquents, car le niveau d’activation de base de leurs représentations lexicales serait inférieur à celui des derniers. De même, comme chaque élément à traiter consume des ressources, les ressources cognitives disponibles pour le traitement de chaque morphème sont proportionnellement moindres dans des énoncés longs que dans des énoncés courts. Ce nécessaire compromis lors du partage des ressources entre les opérations de stockage et de traitement peut donc se traduire par une chute des performances en compréhension d’énoncés, soit par oubli des premiers éléments traités, soit par manque de ressources pour traiter les derniers éléments présentés. Objectif Cette étude évalue l’impact de la longueur des énoncés et de la fréquence lexicale des lexèmes sur les performances en compréhension d’énoncés d’enfants de 4, 6, 8 et 10 ans. Méthodologie Participants : Enfants de 4, 6 et 8 ans (N=30 dans chaque groupe) et 15 enfants de 10 ans Tâche : Compréhension d’énoncés présentés oralement (structure = S + V transitif + COD + Proposition relative sujet avec verbe intransitif). Manipulation de la fréquence lexicale (4 niveaux) et de la longueur des énoncés par ajout d’éléments redondants (4 niveaux) Résultats Les effets de fréquence lexicale et de longueur se marquent en termes de réponses correctes de 4 à 6 ans, et en termes de rapidité de réponse de 6 à 10 ans. Conclusions La longueur des énoncés et la fréquence lexicale des termes utilisés sont des facteurs de complexité dans la compréhension d’énoncés, qui se manifestent par un échec de la compréhension chez les enfants les plus jeunes, et par un allongement du temps de traitement chez les enfants plus âgés. [less ▲]

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See detailLe manque de variabilité des schémas de construction comme facteur explicatif des difficultés morphosyntaxiques chez les enfants dysphasiques
Leroy, Sandrine ULg; Moulin, Mélissa; Parisse, Christophe et al

Conference (2010, July 06)

Detailed reference viewed: 89 (6 ULg)
See detailRepeated thermal treatments applied to ordered TiO2 mesoporous thin film: Effect on the film crystallization and surface area
Henrist, Catherine ULg; Dubreuil, Olivier; Krins, Natacha ULg et al

Conference (2010, July 06)

Ordered, mesoporous films are prepared by template-assisted sol-gel techniques such as dip-coating from a precursors solution. However, monolayer films are only a few hundred nanometers thick and present ... [more ▼]

Ordered, mesoporous films are prepared by template-assisted sol-gel techniques such as dip-coating from a precursors solution. However, monolayer films are only a few hundred nanometers thick and present a limited surface area of active material resulting in poor photovoltaic performances. Therefore it is needed to increase the film thickness. A multilayer deposition process for anatase mesoporous film has been reported in the literature in 2005 by Zukalova and all. Unfortunately, later researches have shown a surface area limitation despite the increase of film thickness due to the repeated thermal treatments applied to the layers. In this study, we have investigated the microstructural evolution of a single mesoporous TiO2 layer submitted to repeated thermal treatments. The modifications are discussed in terms of film thickness, surface area, anatase crystals size and global crystallinity. Besides, we propose an alternative thermal treatment designed in an attempt to overcome the limitations induced by repeated calcinations. We have followed and compared the properties of mesoporous films submitted to both thermal treatments by X-ray diffraction (XRD), transmission electron microscopy (TEM) and environmental poroellipsometry (EEP). Those results show the importance of the tuning of thermal treatment when multilayers films are envisaged for DSSC applications. Indeed, this study quantifies the maximum perturbation encountered by the first layer during the preparation of a multilayer (up to 12) coating, which is submitted to a multistep calcination. Finally, the photovoltaic performances of assembled cells have been evaluated. [less ▲]

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See detailCorps scéniques vs corps écraniques. Les spectacles de Beaubois et Kuypers
Tomasovic, Dick ULg

Conference (2010, July 05)

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See detailCounterparty Risk in Credit Default Swaps Markets
Sougné, Danielle ULg; Mattar, Jamal ULg

Conference (2010, July 04)

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See detailMisery loves company beauty contest dynamics in exchange rates expectations
Muller, Aline ULg; Pancotto, Francesca

Conference (2010, July 02)

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See detailEvaluation of a hydro-alcoholic solution as pre-surgical hand antisepsis in a veterinary setting.
Verwilghen, Denis ULg; Mastrocicco, Emilie; Mainil, Jacques ULg et al

Conference (2010, July 02)

Introduction: Despite the fact that presurgical antiseptic hand treatment of surgical staff has since become a worldwide accepted procedure, surgical site infection is still one of the most frequent types ... [more ▼]

Introduction: Despite the fact that presurgical antiseptic hand treatment of surgical staff has since become a worldwide accepted procedure, surgical site infection is still one of the most frequent types of nosocomial infections. Many products have been used for hand antisepsis, but the popularity of alcoholic rubs amongst human surgeons is increasing as they have shown to provide a rapid and immediate action, are considerably faster than disinfecting soap scrubs and cause less skin damage after repeated use. The purpose of this study was 1) to identify surgical hand antisepsis habits amongst veterinary surgery specialists in Europe (ECVS) and the United States (ACVS), 2) to compare povidone iodine and chlorhexidine gluconate scrubs with a hydro-alcoholic rub hand antisepsis protocol and 3) to evaluate the usefulness of a hydro-alcoholic rub solution in a veterinary surgical setting. Materials and Methods: Emails were sent to 1300 Diplomates to invite them to participate to an online survey in order to obtain an idea about pre-surgical hand disinfection techniques. In a preliminary trial the efficiency of 4% chlorhexidine gluconate, 7.5 % PVP-iodine and an alcoholic solution containing 45% 2-propanol, 30% 1-propanol, 0.2% mecetronium ethylsulphate (Sterillium®) in bacterial reduction on hands was compared. In a clinical trial, the suitability of Sterillium® was assessed in an equine and small animal set up during surgery procedures. Fingertips were pressed on blood agar plates and Gassner plates prior to hand antisepsis (PHA), after handantisepsis (AHA) and three hours after wearing sterile gloves (AG) in the preliminary trial or at the end of surgery (AS) in the clinical trial. Bacterial counts (colony forming units : CFU’s) were obtained after 24 h of incubation of the plates. The obtained values of CFU from PHA, AHA, AG and AS were expressed as log10 values. For each sample, a reduction factor (RF) was obtained from the difference of log10 pre-value and log10 post-value. An ANOVA comparison between the effects of the different antisepsis protocols on the mean log10 CFU values and RF’s in function of the different steps was established. Results: A 42.6% response rate was obtained for the survey. Most surgeons’ still use a disinfecting soap only (79.9%) for hand antisepsis prior to surgery, the majority based on chlorhexidine gluconate (81.4%). Significant differences were found between immediate and sustained activities of the different products tested. Sterillium® was shown to have significantly lower LSM log10 CFU at AG compared to both other products. At AHA, povidone iodine revealed to have significantly higher LSM log10 CFU than Sterillium® and chlorhexidine gluconate, with the last two products having comparable activities. Reduction factors for the Sterillium® were significantly greater than for the other products. Only RF1 was comparable between Sterillium® and chlorhexidine gluconate. In the clinical trial, no significant differences were found between surgeons regarding LSM log10 CFU after hand antisepsis, neither between RF from samples taken at the small animal versus the equine surgery theatre. Discussion: This study confirms that Sterillium® is more effective in reducing bacterial counts on hands prior to surgery in a veterinary setting as are chlorhexidine gluconate (CHX) and povidone iodine soap. Moreover, they provide better tolerance and compliance to surgical hygiene protocols. Despite this, veterinary surgeons from all over the world still prefer the use of CHX soap, which has far more disadvantages than commonly accepted. Apart from the better skin tolerance and the absence of known resitance to the product, the use of Sterillium® offers the advantage of a fast (1.5 minute) surgical handantisepsis. This study shows that, as previously reported for human medicine, Sterillium® can safely be used in a veterinary surgical setting. [less ▲]

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See detailTechnofonctionalité des lipides alimentaires
Danthine, Sabine ULg

Conference (2010, July 01)

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See detailBiomimetic coatings with robust antibacterial properties
Jérôme, Christine ULg; Cécius, Michaël; Faure, Emilie ULg et al

Conference (2010, July 01)

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See detailHeterogeneity of residuals variances of milk fatty acids in dairy cattle
Arnould, Valérie ULg; Soyeurt, Hélène ULg; Vanderick, Sylvie ULg et al

Conference (2010, July)

Routine genetic evaluation for milk fatty acids is under development in the Walloon Region of Belgium. The objective of this study was to test the heterogeneity of residual variances and therefore ... [more ▼]

Routine genetic evaluation for milk fatty acids is under development in the Walloon Region of Belgium. The objective of this study was to test the heterogeneity of residual variances and therefore indirectly the potential need to adjust for this heterogeneity if it exists. The residuals were computed as the difference between the observed and the estimated values using a multi-trait random regression test-day model, similar to the Walloon routine model, used for first lactation only milk yield, quantities and percentages of protein (PROT) and fat (FAT), content of saturated fatty acids in milk (g/100g of milk, SAT) and, content of mono-unsaturated fatty acids in milk (g/100g of milk, MONO). Residuals were considered homogeneous inside strata defined, among others, by weeks of lactation, by days in milk and by calendar months of test date. About 6,687,000 records were available for milk yield and for FAT and PROT parameters. For SAT and for MONO, about 184,000 records were available in this database. Means of residuals were stable and close to zero for all traits. Variances were more variable for MONO and SAT than for milk yield, for example. Daily and weekly variances tended to decrease at the end of the lactation (50%). When the variances were computed by month of test date, some variations were observed and some periods of year were more marked. In conclusion, the observed residual variances were less stable for MONO and SAT. We can conclude that introduction for heterogeneous residual variance is more important for the new traits (MONO, SAT) than it was for the old, traditional ones. [less ▲]

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See detailEvaluation of odour impact from a landfill area and a waste treatment facility through the application of two atmospheric dispersion models.
Ubeda, Yolanda; Ferrer, M.; Sanchis, E. et al

Conference (2010, July)

Odour emission from landfill areas has a high potential to cause significant annoyance to people living in their surroundings. In order to avoid odour nuisance, it is crucial to select the best location ... [more ▼]

Odour emission from landfill areas has a high potential to cause significant annoyance to people living in their surroundings. In order to avoid odour nuisance, it is crucial to select the best location in the project phase of these facilities. In the present work, two different atmospheric dispersion models were employed to predict odour impact from a projected landfill area and a waste treatment facility. The first model used was a simplified Gaussian Atmospheric Dispersion model developed by the authors. Calculated odour concentrations were represented using GIS tools (Esri ®ArcMapTM software). Regarding to the second model, it was a commercial bi-Gaussian Atmospheric Dispersion one. The odour impact of the waste treatment facility is expected to be low, because of the high efficiency of air biofiltration treatments and the dispersion effect of the stack. The shape and the reach of odour percentile contours were quite similar, providing coherent results between two models. Concerning the landfill installation, odour concentrations were modelled for the prevailing winds. The results obtained with both models differ in the reach of odour. The maximum distance obtained by the simple dispersion model was 1.5 km, compared with the almost 5 km modelled by the commercial bi-Gaussian one. The reasons of this disparity could be caused by the difference in the dispersion coefficients employed in the two models and also an error related to ground level emission. In addition, the meteorological conditions in the Mediterranean typically present a high proportion of calm winds, which provided worse dispersion results and did not reflect the real odour dispersion. Odour emission rate seems to be overestimated, and this could explain the high distance reached by odour. Field measurements are required when landfill installation becomes operational, in order to determine the real impact of odour. Bi-Gaussian Dispersion Models may not be appropriate to quantify the odour impact from agricultural sources. [less ▲]

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See detailReining in Excessive Risk Taking by Executives: Experimental Evidence
Lefebvre, Mathieu ULg

Conference (2010, July)

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See detailImprovements and validation of mid-infrared predictions of milk fatty acid
Soyeurt, Hélène ULg; McParland, Sinead; Donagh, Berry et al

Conference (2010, July)

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by ... [more ▼]

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by comparing 6 statistical approaches. The second one was to validate the new equations using an independent sample set. The calibration set contained 239 spectrally different Belgian milk samples collected for over 2 years from several cows and breeds. FA were quantified by gas chromatography (GC). Statistical approaches tested were 1) partial least squares regression (PLS), 2) PLS and first derivative, 3) PLS and repeatability file (RF), 4) PLS, first derivative and RF, 5) PLS, second derivative, and 6) PLS, second derivative and RF. This last file contained spectra obtained from the same samples using 5 spectrometers. Cross-validation (CV) used 20 groups from the calibration set. Methods were compared using the ratio of the standard deviation of GC values to the standard error of CV (RPD). An external validation permitted a second comparison and was done using 362 samples collected for one year from multiple breeds and cows in Belgium, Ireland, and Scotland. Different RPD values were obtained by the 6 methods. Generally the equations developed using method 4 gave better results suggesting the adaptation of the methodology to the studied FA. It confirms by the obtained validation coefficients of determination. Highest values were observed for the equations with the highest RPD values except for C18:0. The ability to predict FA using method 4 gave superior results to those shown in previous publications. [less ▲]

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See detailTotal Solution for Rapid Sample Preparation
Focant, Jean-François ULg

Conference (2010, July)

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See detailSparse Two-Row Cuts and an Algorithm for the Separation Problem
Louveaux, Quentin ULg

Conference (2010, July)

We propose a systematic way to generate sparse cuts from multiple rows of the simplex tableau. We also discuss the question of separation for a multi-row model. To this end, we consideer the polar system ... [more ▼]

We propose a systematic way to generate sparse cuts from multiple rows of the simplex tableau. We also discuss the question of separation for a multi-row model. To this end, we consideer the polar system allowing to generate valid inequalities. In order to avoid generating the large number of constraints of the polar, we consider a reduced version of it that we dynamically extend. Checking the validity of an inequality is done geometrically. Computational results showing the efficiency of the algorithm are presented. This is a joint work with Laurent Poirrier. [less ▲]

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See detailLe contrat leasing en droit belge au regard de l'harmonisation UNIDROIT
Kohl, Benoît ULg

Conference (2010, July)

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See detailThe RMI Space Weather and Navigation Systems (SWANS) project
Warnant, René ULg; Lejeune, Sandrine; Wautelet, Gilles ULg et al

Conference (2010, July)

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See detailMultidimensional fluctuation, pseudo-guessing and carelessness IRT person parameters with polytomous item response models
Raîche, Gilles; Magis, David ULg; Béland, Sébastien

Conference (2010, July)

Frequently, candidates at aptitude multiple choice test miss attention, motivation or preparation and show underachievement or overachievement. Similarly, at surveys respondents show frequently misfitting ... [more ▼]

Frequently, candidates at aptitude multiple choice test miss attention, motivation or preparation and show underachievement or overachievement. Similarly, at surveys respondents show frequently misfitting patterns of responses. Their result does not correspond any more to their true aptitude or attitude, an inappropriate response pattern being obtained. New multidimensional models specific to polytomous responses circumvent these situations and diminish considerably the associated person bias. Multidimensional polytomous item response models adding new person parameters to the trait of the candidate are proposed. In the spirit of previous Raiche’s dichotomous responses IRT propositions, like the discrimination and don’t know item parameters, these models offer fluctuation and don’t know person parameters. Estimation methods, results from simulation showing the efficacy of these models and recommendations for the design of testing situations will be presented. [less ▲]

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See detailSingle molecule interactions of bio-adhesive-inspired polymers with inorganic and organic surfaces
Willet, Nicolas ULg; Giamblanco, Nicoletta ULg; Faure, Emilie ULg et al

Conference (2010, July)

Numerous living creatures have developed adhesion strategies to stick to inorganic or organic surfaces in wet environments. A classic example of permanent bioadhesion is exemplified by mussels, which ... [more ▼]

Numerous living creatures have developed adhesion strategies to stick to inorganic or organic surfaces in wet environments. A classic example of permanent bioadhesion is exemplified by mussels, which secrete adhesive proteins containing a high concentration of 3,4-dihydroxyphenylalanine (DOPA) 1, 2. The catechol species of DOPA are thought to be responsible for the strong adhesion to inorganic surfaces, whereas the oxidized o-quinone species trigger the cross-linking of the glue, ensuring cohesion. The unoxidized form of DOPA is known to adhere to a large variety of inorganic surfaces, although the adhesion mechanism is not yet fully understood.3, 4 A clear understanding is however essential for the design of synthetic adhesive polymers required in many surface science applications. Here we investigate at the single-molecule level the interaction forces between AFM tips coated with bio-inspired polymers and a variety of inorganic and organic surfaces. We prepared polymers bearing several amounts of DOPA units and covalently attached them to AFM tips following our previously published strategy.5, 6 They were homo-or co-polymers and were cross-linked or not. These original bio-inspired tips were used to perform single-molecule force spectroscopy on a range of model, as well as industrial such as stainless and galvanized steel, substrates. The specific interaction forces measured in water were compared with the ones exerted by the same polymers without DOPA. It was found that, depending on the nature of the substrate, the presence of DOPA strongly, or only slightly, increases the interaction forces with the surface. We also investigated the influence of the oxidation state of the catechol species on the intensity of the interaction forces. Again, this influence is strongly related to the nature of the substrate. Finally, we studied the effect of polymer cross-linking on the adhesive interactions. 1. Waite, J. H.; Tanzer, M. L. Science 1981, 212, 1038. 2. Waite, J. H.; Housley, T. J.; Tanzer, M. L. Biochemistry 1985, 24, 5010. 3. Lee, H.; Scherer, N. F.; Messersmith, P. B. Proc. Natl. Acad. Sci. U.S.A. 2006, 103, 12999. 4. Wang, J.; Nawaz Tahir, M.; Kappl, M.; Tremel, W.; Metz, N.; Barz, M.; Theato, P.; Butt, H.-J. Adv. Mater. 2008, 20, 3872. 5. Gabriel, S.; Jérôme, C; Jérôme, R.; Fustin, C.-A.; Pallandre, A.; Plain, J.; Jonas, A. M.; Duwez, A.-S. J. Am. Chem. Soc. 2007, 129, 8410. 6. Cecchet, F.; Lussis, P.; Jérôme, C.; Gabriel, S.; Silva-Goncalves, E.; Jérôme, R.; Duwez, A.-S. Small 2008, 4, 1101. [less ▲]

Detailed reference viewed: 139 (5 ULg)
See detailUse of image appraisal tools and covariance matrix
Caterina, David ULg; Beaujean, Jean ULg; Nguyen, Frédéric ULg

Conference (2010, July)

Detailed reference viewed: 44 (13 ULg)
See detailPigtailed macaques (Macaca nemestrina leonina): the pest and the gardener
Huynen, Marie-Claude ULg; Albert, Aurélie; Savini, Tommaso ULg

Conference (2010, July)

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See detailUsing Snijders’ approach to standardize some parametric person fit indexes with estimated ability levels: a simulation study
Béland, Sébastien; Magis, David ULg; Raîche, Gilles

Conference (2010, July)

Several authors (Molenaar & Hoijtink, 1990; Meijer & Sijtsma, 2001) have shown that several person-fit statistics present some important limitations. One issue is that the distribution of some parametric ... [more ▼]

Several authors (Molenaar & Hoijtink, 1990; Meijer & Sijtsma, 2001) have shown that several person-fit statistics present some important limitations. One issue is that the distribution of some parametric person-fit statistics is unknown. Another important issue is that the distribution of person-fit indexes is most often derived under the true ability level. In this situation, replacing the true ability by some estimate can seriously affect the distribution of these indexes. Snijders (2001) proposed a method to correct the mean and the variance of many parametric person-fit statistics to be approximately standard normally distributed, and derived the corrected version of the lz index. The purpose of this paper is to apply this correction to other well-known parametric indexes, and to compare them with their classical versions. The simulation results indicate that the standardized indexes have empirical type I errors close to the nominal significance level, and that the corrected indexes outperform their classical versions in this regard. [less ▲]

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See detailEvaluer et renforcer l’efficacité des formations professionnelles. Etude dans une entreprise du secteur non-marchand belge
Peters, Stéphanie ULg; Liégeois, Arnaud; Faulx, Daniel ULg

Conference (2010, July)

Avec la concurrence croissante, les entreprises misent sur la formation pour être efficientes. Une littérature abondante permet aujourd’hui d’évaluer l’impact des programmes de formation. Comment cette ... [more ▼]

Avec la concurrence croissante, les entreprises misent sur la formation pour être efficientes. Une littérature abondante permet aujourd’hui d’évaluer l’impact des programmes de formation. Comment cette littérature est-elle utilisée par les praticiens ? Quels en sont les enseignements pour chercheurs ? Une étude est menée dans une entreprise du secteur non-marchand belge. Nous en présentons les fondements théoriques et l’appareillage méthodologique. Les quatre niveaux de l’évaluation selon Kirkpatrick (1998) constituent une référence : les personnes formées sont-elles satisfaites, ont-elles appris, ont-elles transféré les acquis de formation en situation réelle et, in fine, quel est le résultat de cette formation pour l’organisation. Depuis une vingtaine d’années, de nombreuses études ont permis l’identification des variables influençant ces quatre niveaux, et plus singulièrement le transfert : les variables liées à l’apprenant, les variables liées au contexte et les variables liées au design pédagogique. Elles ont été combinées dans des modèles complexes, dont le « Flawed Four-Level Evaluation Model » de Holton (1996). C’est sur ce modèle que s’appuie cette étude. Une attention particulière est accordée au climat de transfert, défini comme « la perception qu’a l’employé des facteurs qui l’aident ou au contraire l’empêchent d’exploiter ce qu’il a appris en situation de travail » (Bennett & Lehman, 1999, p. 193). Afin de préciser davantage l’impact du climat de transfert sur le transfert lui-même, nous avons envisagé le rôle médiateur de variables organisationnelles comme le préconisent Carr, Schmidt, Ford, et DeShon (2003) : la satisfaction au travail et l’implication organisationnelle. Une enquête par questionnaires est en cours auprès du personnel suivant une formation entre mars et novembre 2010 (N=554). Deux temps de mesure sont prévus : (1) à l’issue de la formation (mesure de la satisfaction, de l’apprentissage et du climat de transfert), (2) un mois après la formation (mesure du transfert auto-rapporté, de la satisfaction au travail et de l’implication organisationnelle). Les données récoltées vont permettre d’envisager le transfert comme un véritable processus dynamique. Il s’agit là d’un apport majeur pour les recherches futures en matière d’évaluation, dans la mesure où la tendance de ces dernières années a été d’appréhender le transfert comme une variable fixe et statique. Pour les praticiens, cette étude fournira de nombreuses pistes d’interventions en vue de renforcer l’efficacité de leurs programmes de formation. [less ▲]

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See detailLes prényltransférases et leurs rôles biologiques chez les pucerons
Vandermoten, Sophie ULg; Cusson, Michel; Haubruge, Eric ULg et al

Conference (2010, July)

Detailed reference viewed: 7 (1 ULg)
See detailLife cycle inventory of stainless steel – A review of challenges, methods and applications.
Rossi, Barbara ULg

Conference (2010, July)

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of ... [more ▼]

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of steel as a sustainable material, the principles of a life-cycle analysis are presented. The paper then focuses on the life-cycle inventory data of several products: finished cold-rolled coil, electro-galvanized steel, section rolling and rebar. The data are presented for two (sometimes three) different recycling rates. Indeed, since steel is recycled to more than 85% at the end of its life and recyclable and indefinite number of times, the presented inventory includes allocation for scrap inputs and outputs using the closed material loop recycling methodology developed by the International Iron and Steel Institute (IISI). A description of the method principles is also provided. The influence of the end-of-life credit method will be discussed. Corrosion and subsequently maintenance of steel products will be treated afterwards and a brief comparison of the life-cycle inventory will be provided for electro-galvanized steel and finished steel. [less ▲]

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See detailGenomic expression evaluation: introduction and perspectives
Ramery, Eve ULg; Bureau, Fabrice ULg; Guyot, Hugues ULg et al

Conference (2010, July)

In a way, disease could be considered as the result of gene expression deregulation. Knowing what genes are expressed in a particular cell or tissue and how they are regulated allow to better understand ... [more ▼]

In a way, disease could be considered as the result of gene expression deregulation. Knowing what genes are expressed in a particular cell or tissue and how they are regulated allow to better understand disease mechanisms. Transcriptomic is the study of the expression of the entire genome. This technical challenge has been rendered possible as different species’ genomes began to be sequenced. Several techniques have rendered efficient this process of measuring simultaneously the expression level of a large number of genes. To date, micro-array technology is probably the best known. However, with the development of more affordable techniques, sequencing/ resequencing could compete with microarrays in the future. All together, these techniques open new ways for early diagnosis and prognosis for the practioner ‘in the field’. [less ▲]

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See detailContract renewal as an incentive device: An application to the French urban transport sector
Gautier, Axel ULg

Conference (2010, July)

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization ... [more ▼]

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization during the current contract and from the perspective of contract renewal. We have constructed a dynamic incentive regulation model that captures these features and we show that both the level of cost-reducing effort and its repartition during the contracting period depend on the contract type (cost-plus, gross cost or net cost contract). We then estimated a cost frontier model for an eight-year panel of French bus companies (677 company-year observations) to test our predictions. [less ▲]

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See detailAbout time and judges: How do magistrates face the question of quickness, efficiency and delays?
Schoenaers, Frédéric ULg; Delvaux, David ULg; Mouhanna, Christian et al

Conference (2010, July)

This paper will present a research in progress which aims to study the organisation of courts and the changes in the work of magistrates. More precisely it describes the different ways in which judges and ... [more ▼]

This paper will present a research in progress which aims to study the organisation of courts and the changes in the work of magistrates. More precisely it describes the different ways in which judges and prosecutors face the question of quickness, efficiency and delays in the different fields of judicial activity. Justice is usually seen as an institution in which judges take time in order to decide on cases – and is frequently criticized for being slow and inefficient. However, we now witness a rapid change: the management of cases, as well as the pressures exerted by media and political actors have profoundly affected the operations of courts. In all matters, civil as well as criminal, the main concern is now to give quick answers to every situation submitted to the court. As the time given to the treatment of each case decreases, one can ask what is the impact on the way cases are dealt with and the effect on the work of judges. The study presented will compare this issue of time and judging using the data collected in five courts in two countries, Belgium and France. [less ▲]

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See detailGlass eel swimming behaviour during their estuarine migration: new insights from video tracking analysis
Delcourt, Johann ULg; bolliet, Valérie; Ylieff, Marc ULg et al

Conference (2010, July)

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See detailOutlier identification of differential item functioning in multiple groups
Magis, David ULg; De Boeck, Paul

Conference (2010, July)

Differential item functioning (DIF) has received increasing focus in the past decades. Recently, Magis and De Boeck (2009) proposed to identify differentially functioning items as outliers in a one ... [more ▼]

Differential item functioning (DIF) has received increasing focus in the past decades. Recently, Magis and De Boeck (2009) proposed to identify differentially functioning items as outliers in a one-dimensional space of DIF measures, using robust statistical tools for outlier identification. The purpose of this talk is to present an extension of this approach for the case of more than one focal group. In this multiple group framework, items can be characterized by multiple vectors of DIF measures, one for each focal group, so that a multivariate DIF space is obtained. DIF items can then be identified as outliers in this multivariate space, based on robust multivariate estimators of location and dispersion. The MCD (Minimum Covariance Determinant) estimator is shown to be adequate for this purpose. A major asset of the method that it can rely on existing DIF indices to define the DIF vectors, and that it does not need a purification step. Alternatively, it can be used to determine on an anchor set. The method will be illustrated by an example about calculator effects on mathematics test items. [less ▲]

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See detailFeasibility of a genetic evaluation for milk fatty acids in dairy cattle
Soyeurt, Hélène ULg; Arnould, Valérie ULg; Vanderick, Sylvie ULg et al

Conference (2010, July)

Recent development of equations based on mid-infrared (MIR) spectrometry for the prediction of milk fatty acid (FA) contents allows their measurement on a large scale during performance recording. The ... [more ▼]

Recent development of equations based on mid-infrared (MIR) spectrometry for the prediction of milk fatty acid (FA) contents allows their measurement on a large scale during performance recording. The objective was to show that a genetic evaluation for milk FA in dairy cattle is feasible in the Walloon region of Belgium and to report first results. Estimated breeding values (EBV) and associated reliabilities (REL) were computed using a multi-trait test-day animal model similar to the one used for the routine genetic evaluation for yield traits. Studied traits were first lactation test-day milk, fat and protein yields, fat (FAT) and protein contents, and content of saturated fatty acids in milk (g/100g of milk, SAT). More than 6,700,000 records were available for common production and content traits and 194,000 records were used for SAT. Used variance components were estimated using REML. The average SAT content was 2.79% with a standard deviation (SD) of 0.50%. A total of 1,707 Holstein bulls used in Walloon Region had REL superior to 0.49 for all studied traits. REL for SAT ranged from 0.53 to 0.99. A total of 1,217 bulls had REL superior to 0.74. SD of EBV for SAT was 0.20%. The maximum and minimum SAT EBV values were 0.89% and -0.69%, respectively. In order to have a direct measure of the part of FAT that is not due to SAT, a new trait (dSAT) was post-evaluated and defined as difference between expected SAT EBV for a given FAT EBV and the estimated EBV for SAT. This new trait can be assumed to be a direct predictor of the content of unsaturated fatty acids in fat. The interest is that this trait cannot be accurately predicted directly by MIR. The maximum and minimum EBV for dSAT for the 1,707 bulls were -0.28% and 0.24%, respectively. Based on these results, a genetic evaluation for milk fatty acids is feasible. In the bull population used recently, a genetic variability for dSAT exists and could be used to improve the milk fat composition. [less ▲]

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See detailKnee model using articular shape knowledge
Schwartz, Cédric ULg; de Zee, Mark; Rasmussen, John et al

Conference (2010, July)

In motion capture, a standard procedure to obtain the bone motion is the use of skin markers. However, because of the relative motion of the skin and the bones, so-called soft tissue artefacts (STA), the ... [more ▼]

In motion capture, a standard procedure to obtain the bone motion is the use of skin markers. However, because of the relative motion of the skin and the bones, so-called soft tissue artefacts (STA), the recorded motion does not accurately describe the movement of the bones. To compute joint reaction forces and perhaps limit STA, most musculo-skeletal models use underlying joint models. The knee is usually modeled as a simple hinge joint. However such approaches do not lead to a better estimation of the real motion1. In this work the hinge joint is improved by taking into account the morphological features of the joint surfaces. [less ▲]

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See detailLa Paleontología en el Espacio Europeo de Educación Superior
Cascales - Miñana, Borja ULg; Muñoz-Navarro, R.

Conference (2010, July)

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See detailÉtude du lien entre traumatisme et addiction en relation avec les conditions de travail dans une population professionnelle à risque : Analyse quantitative et qualitative au sein d’un échantillon de pompiers
Blavier, Adelaïde ULg; Perick, T.

Conference (2010, July)

Plusieurs populations professionnelles sont confrontées à des situations traumatiques de façon répétée et quotidienne (polices, pompiers, ambulanciers). Ces professionnels constituent donc une population ... [more ▼]

Plusieurs populations professionnelles sont confrontées à des situations traumatiques de façon répétée et quotidienne (polices, pompiers, ambulanciers). Ces professionnels constituent donc une population particulièrement exposée au risque de développer des états de stress post-traumatiques, ce qui est attesté par de nombreuses études qui en recensent plusieurs cas. De manière générale, c’est plus souvent suite aux diverses interventions et à leur accumulation que les intervenants développent des symptômes pathologiques. Cela représente donc un processus sur le long terme. Les réponses face aux symptômes de cet état sont de plusieurs ordres. On relève des stratégies de coping, d’évitement, du refoulement, des conversions, des troubles obsessionnels mais aussi des conduites addictives. C’est cette dernière réponse en particulier que nous investiguons au sein d’une population de pompiers-ambulanciers à travers une analyse quantitative et qualitative. Une forte association entre le PSTD et les conduites addictives a été mise en évidence par de nombreuses études (Acierno et al., 2000 ; Beckham et al., 1997 ; Breslau et al., 2003, 2004 ; Chilcoat & Breslau, 1998 ; Deykin & Buka, 1997 ; Hapke et al., 2005 ; Kessler et al., 1995 ; Kilpatrick et al., 2000 ; Lasser et al., 2000, Shalev et al., 1990) : les individus souffrant d’un PTSD présentent un risque élevé de développer des dépendances à différents produits psychotropes. Cependant, la plupart de ces études se sont basées sur des personnes qui ne travaillaient plus et les analyses sont donc réalisées en dehors de toute situation de travail. Afin de mieux comprendre le lien entre les conduites addictives et la présence de traumatisme chronique au sein d’un contexte professionnel, 60 pompiers ont participé individuellement à un entretien semi-structuré et ont répondu à plusieurs questionnaires portant sur l’existence d’un traumatisme (Traumaq), le bien-être (GHQ-28), la consommation de drogues (DAST-20) et d’alcool (Audit). Notre analyse quantitative montre que 16,67% (10 sujets) de l’échantillon présente un traumatisme psychique (9 des sujets présentent un traumatisme léger tandis que le dernier présente un traumatisme modéré). Nous obtenons les mêmes fréquences pour les consommations de drogues douces ou de médicaments sans ordonnance médical. Cependant, il n’existe aucun lien entre les addictions mises en évidence et la présence d’un traumatisme. En effet, les régressions linéaires montrent que le traumatisme n’explique pas les comportements d’addiction dans notre échantillon. Il intervient par contre dans près de 50% de l’explication du bien-être psychologique des pompiers. L’analyse qualitative du discours met en évidence la nécessité d’un soutien psychologique post-intervention (19%) ainsi que l’impact important des problèmes organisationnels (12,3%) et du manque de soutien et de considération de la hiérarchie (15,8%) sur le développement d’un traumatisme psychologique. En conclusion, si on ne peut pas travailler sur l’existence des événements potentiellement traumatiques, il est nécessaire de travailler en amont et en aval par une prise en charge psychologique pré et post-intervention. Ceci pourrait être favorisé par l’évolution positive des mentalités au sein des casernes à ce sujet. Cette étude et d’autres articles (Blavier, in press) insistent également sur l’importance de la reconnaissance des faits et la nécessité d’un comportement empathique de la part de la hiérarchie. Les ressources pré et post-interventions pourront ainsi diminuer l’apparition des psycho-traumatismes et leurs conséquences telles que l’absentéisme ou les addictions. [less ▲]

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See detailEl efecto pigmalión o la teoría de la profecía autocumplida
Muñoz-Navarro, R.; Cascales - Miñana, Borja ULg

Conference (2010, July)

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See detailLA DYSPHASIE: CARACTÉRISTIQUES LINGUISTIQUES ET NON LINGUISTIQUES
Maillart, Christelle ULg

Conference (2010, June 29)

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See detailThe use of semi-empirical modeling to extrapolate chiller performance maps
Lemort, Vincent ULg; Bertagnolio, Stéphane ULg

Conference (2010, June 28)

HVAC&R components operate most of the time in part load conditions for which little data are available from manufacturers. This makes performance prediction difficult. Approaches and problems are ... [more ▼]

HVAC&R components operate most of the time in part load conditions for which little data are available from manufacturers. This makes performance prediction difficult. Approaches and problems are presented for simulating the performance of HVAC&R components under part load conditions and under consideration of dynamic effects such as cycling. The seminar motivates a discussion about HVAC&R component modeling for part load and dynamic conditions and it dscusses what additional data are required from manufacturers to assess the performance at these conditions. [less ▲]

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See detailRobust ordinal logistic regression
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg; Croux, Christophe ULg

Conference (2010, June 28)

Logistic regression is a widely used tool designed to model the success probability of a Bernoulli random variable depending on some explanatory variables. A generalization of this bimodal model is the ... [more ▼]

Logistic regression is a widely used tool designed to model the success probability of a Bernoulli random variable depending on some explanatory variables. A generalization of this bimodal model is the multinomial case where the dependent variable has more than two categories. When these categories are naturally ordered (e.g. in questionnaires where individuals are asked whether they strongly disagree, disagree, are indifferent, agree or strongly agree with a given statement), one speaks about ordered or ordinal logistic regression. The classical technique for estimating the unknown parameters is based on Maximum Likelihood estimation. Maximum Likelihood procedures are however known to be vulnerable to contamination in the data. The lack of robustness of this technique in the simple logistic regression setting has already been investigated in the literature, either by computing breakdown points or influence functions. Robust alternatives have also been constructed for that model. In this talk, the breakdown behaviour of the ML-estimation procedure will be considered in the context of ordinal logistic regression. Influence functions will be computed and shown to be unbounded. A robust alternative based on a weighting idea will then be suggested and illustrated on some examples. The influence functions of the ordinal logistic regression estimators may be used to compute classification efficiencies or to derive diagnostic measures, as will be illustrated on some examples. [less ▲]

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See detailTranslating WHO’s recommendations into policies: a looping process of normative framing
Cerfontaine, Gaëtan ULg

Conference (2010, June 25)

This presentation proposal rests on empirical data collected through a European program named « Know and Pol ». The aim of our paper is to understand the process through which the recommendations emitted ... [more ▼]

This presentation proposal rests on empirical data collected through a European program named « Know and Pol ». The aim of our paper is to understand the process through which the recommendations emitted by the World Health Organization are translated in on-the-ground policy and practices in the Belgian mental health sector. As for many countries, these recommendations and the care model they promote contrast on several points with the practices and the structure of the Belgian mental health sector. One element advocated by the WHO has in particular raised controversies and oppositions: the necessity to replace the traditional hospital-centered model by community cares within small ambulatory structures. Therein lies the principal criticism addressed to the Belgian mental health cares policy. Through a focus on the reception of these recommendations and on a particular policy – “the therapeutic projects in mental health”, which can be seen as the last tentative to reform the organization of the sector –, we will analyze a process through which “big ideas” are translated in concrete policies. Indeed, in spite of the lack of legal constraint, these recommendations have proved to have some kind of normative capacity. Nowadays in Belgium, every text or policy discourse (held by politicians, civil servants or representatives of the field actors) concerning the mental health policy acknowledges the WHO’s recommendations and this, despite the fact that they could be seen as antagonist to some actors’ interests. In order to understand this evolution, we shall refer to the Michel Callon’s concept of “point of obligatory passage” which underlines the creative activity of the actors who do not just receive passively these norms but, on the contrary, who reinterpret and translate these ideas in new policy. Our presentation will underline (1) that in spite of the antagonism between those ideas and some actors’ constituted interests, notably the representatives of the hospital organizations, these actors may reinterpret WHO norms strategically so as to fit with their own interests and the organizational context they are involved in. (2) We assume that such an interpretive work is possible because these recommendations do not provide a clear way to act but, can be used in order to imagine “new possible worlds”. (3) By doing so, these actors are legitimizing WHO’s recommendations and are reinforcing the possibility for other actors to use them in order to elaborate and legitimize new policies. In conclusion, we’ll see that the process of reform and the influence of these norms are far from being direct and linear but, on the contrary, are long, iterative and constituted of “reinforcing loops”. At the methodological level, we’ll discuss the possibility to observe the multi-level process of elaboration of a policy through the materials (texts, declarations, evaluations…) produced and mobilized by the different actors. Indeed, with the interviews and observations, these materials constitute one of the major parts of our data collection. [less ▲]

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See detailAntibiotic consumption and bacterial resistance
ZAOUI, Kuider; MELIN, Pierrette ULg; CHRISTIAENS, Geneviève ULg et al

Conference (2010, June 25)

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See detailLes généralistes : De bons acteurs en prévention ? Analyse d’une échelle d’attitude
Vanmeerbeek, Marc ULg

Conference (2010, June 24)

La prévention est le parent pauvre de la médecine : dispersion des acteurs entre agences spécialisées et soignants de terrain, entre niveaux de pouvoir, faibles moyens financiers et faibles résultats ... [more ▼]

La prévention est le parent pauvre de la médecine : dispersion des acteurs entre agences spécialisées et soignants de terrain, entre niveaux de pouvoir, faibles moyens financiers et faibles résultats objectivés. Les généralistes sont ils des acteurs incontournables ? Entre la prévention opportuniste durant leurs consultations et les grandes campagnes de santé publique, ont-ils envie de créer une troisième voie : opérateurs autonomes organisés pour leur patientèle et relais efficaces d’actions collectives ? L’avis d’un échantillon de généralistes belges francophones est étudié par une échelle d’attitude. Quarante indicateurs situent les répondants sur trois axes principaux et deux axes secondaires : 1. Des soins à la santé La globalité de la santé est-elle abordée aussi systématiquement en prévention que dans le domaine curatif où la plainte du patient sert de déclencheur ? 2. De l’individuel au collectif, face aux patients Les généralistes se sentent-ils responsables de la communauté de leurs patients, prise comme un ensemble ? Sont-ils prêts à intégrer de nouvelles compétences dans les domaines de la gestion des données générées par l’activité clinique ? • Axe secondaire : l’évaluation de pratique Les généralistes trouvent-ils de la satisfaction dans leur métier avec des méthodes de travail et des indicateurs provenant du monde de la santé publique ? 3. De l’individuel au collectif, face aux autres acteurs en santé Les généralistes manquent de temps. Sont ils prêts à déléguer à des tâches à des paramédicaux ou du personnel administratif, à collaborer avec des acteurs en promotion de la santé ? • Axe secondaire : les généralistes face à l’organisation de la santé publique Les généralistes voient-ils dans les structures de santé publique des partenaires fiables ? [less ▲]

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See detailFinancement public et gestion de la pluralité religieuse en Belgique
Husson, Jean-François ULg

Conference (2010, June 24)

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See detailBelgian Mental Health On-Stage
Thunus, Sophie ULg

Conference (2010, June 24)

In 2005, a reform aiming at reorganizing Belgian mental health supply around networks and care circuits organized along the needs of mentally ill persons has begun. The working conditions in mental health ... [more ▼]

In 2005, a reform aiming at reorganizing Belgian mental health supply around networks and care circuits organized along the needs of mentally ill persons has begun. The working conditions in mental health networks are experimented through the “therapeutic projects” and the “transversal dialog”. These two consultation devices offer an opportunity to observe the inner working of new policy settings which collectively entrust different actors, relying on political, administrative, professional or profane logics, with a reflexive mandate. This paper reports the results of a case study of the cluster “adults suffering from mood disorders” of the “transversal dialog”. The whole experiment realized on this scene is presented in three Acts that represent the successive steps of a translation (Callon 1986). Indeed, while the transversal dialog aims at producing hybrid knowledge on mental health sector, providing policy actors with relevant insights in the perspective of the reform, it constitutes a “stage” where the problematization of the mental health world is negotiated. However, the way policy actors have received the hybrid discourse produced by the field actors raise questions as to the actual objectives of the experimentation: does the transversal dialog produce knowledge on mental health sector or does it instil a culture of the controversy? [less ▲]

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See detailAre Foreign Profitability Disclosures Value-Relevant? Disaggregation Resolves the Puzzle
Muller, Aline ULg; Joliet, Robert

Conference (2010, June 24)

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See detailEuropaentwürfe im literarischen Werk von Hilde Spiel
Viehöver, Vera ULg

Conference (2010, June 23)

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See detailMisery loves company beauty contest dynamics in exchange rates expectations
Muller, Aline ULg; Pancotto, Francesca

Conference (2010, June 23)

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See detailDemocratic Accountability in Governance of Science and Technology: on Reflexivity in European Parliamentary Technology Assessment Offices
Delvenne, Pierre ULg

Conference (2010, June 22)

Nowadays more than ever, dealing with risky scientific and technological issues requires careful attention and sustained policy-making support. In Western Europe, since the 1980s onwards, science and ... [more ▼]

Nowadays more than ever, dealing with risky scientific and technological issues requires careful attention and sustained policy-making support. In Western Europe, since the 1980s onwards, science and technology (S&T) issues are addressed in the institutional arena of Parliamentary Technology Assessment (PTA) offices. The main function of those PTAs is to increase the democratic accountability of S&T governance by providing the policy-makers and some stakeholders with intelligence on technological innovations and/or by enhancing social debate. Being based on literature research, participatory observation, official document analysis and qualitative data collection (through semi-structured interviews with academics and TA practitioners), we claim that the emergence and development of Parliamentary Technology Assessment offices (PTAs), leading/supposed to lead to an increased democratic accountability, embody a relevant indication of S&T governance becoming more reflexive. We offer case studies of several European PTAs and we are particularly interested in how much reflexivity is visible. After formulating two main dimensions of (reflexive) governance of S&T, openness to plurality and blurring of boundaries, we map the paths of these institutions over time along these two dimensions. Then, we argue than there appears to be a reflexivity pathway, on which some PTAs have moved farther than others. The empirical evidence for such a pathway to exist reveals the multiple features of democratic accountability fostered by one PTA setting or another, which may range from a managerial outcome (decision-makers are accountable) to a public outcome (citizens are accountable) and a professional outcome (scientists are accountable). [less ▲]

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See detailThe NO Venus nightglow: SPICAV observations and implications on transport in the lower thermosphere
Gérard, Jean-Claude ULg; Cox, Cédric ULg; Bertaux, J.-L.

Conference (2010, June 22)

A new set of 725 NO limb profiles has been analyzed. The profiles have been deconvolved and inverted to get volume emission rates. Updates mean VER peak altitude is 115 km, in excellent agreement with PV ... [more ▼]

A new set of 725 NO limb profiles has been analyzed. The profiles have been deconvolved and inverted to get volume emission rates. Updates mean VER peak altitude is 115 km, in excellent agreement with PV results obtained 30 years ago. The corresponding average vertical intensity is 1.2 kR. The altitude of emission occurs at a higher altitude near the bright spot region than at larger distances (by about 7 km). The location of the statistical bright spot is the same as observed with PV (that is shifted dawnward by 2 hrs and slightly south of AS point). The nightside mean vertical intensity is between 0.4 and 1.8 kR, which brackets the values derived from the limb profiles. These results, coupled with other airglow measurements, provide constraints on global atmospheric circulation and vertical transport [less ▲]

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See detailThe Good, The Bad and the Ugly: integrating multiple frames in Flanders and Wallonia air policies by using the Delphi method
Fallon, Catherine ULg; Hendrickx, Kim ULg; Vanhaeren, Stéphanie ULg

Conference (2010, June 21)

A new European frame has developed stepwise to manage the health effect of air pollution from particulate matter (PM 10 and PM 2,5), backed by an international body of scientific knowledge and OMS reports ... [more ▼]

A new European frame has developed stepwise to manage the health effect of air pollution from particulate matter (PM 10 and PM 2,5), backed by an international body of scientific knowledge and OMS reports. The European Union CAFE Directive (2008) leaves the Member States with an important margin to translate the air quality objectives into action plans. In Belgium this policy is entirely left to the regions which developed different frames and decisional spaces. Belgium is a pollution 'hot spot' because of the variety of pollution sources it is faced with (traffic density, industrial density, transboundary pollution). As such, it provides an interesting ground for comparative research. We conducted a comparative research in the two largest Belgian regions and identified two decisional spaces that differ on a political, administrative and technical levels. Earlier research on risk management has pointed out that transversality, openness, and interdisciplinarity positively affect the quality of decision making under uncertainty. In that perspective, can specific tools help foster a transversal and integrative approach in air policy? In the Scope-project, a web-based tool using the Delphi method has been tested in the two regions. This allowed to put forward some hypotheses concerning the potential for transversality, interdisciplinary and openness in these different structures and decisional spaces. The results of the experiment and its potential for generalisation will be discussed at length. [less ▲]

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See detailThe Magical Number Seven and the Contemporary Italian Song
Valenti, Gianluca ULg

Conference (2010, June 18)

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See detailGroup B streptococcal Screening, Diagnosis and Clinically Relevant Resistance
Melin, Pierrette ULg

Conference (2010, June 17)

In the setting of a maternal GBS-screening program and successful implementation of the strategy, efforts to improve screening for GBS status remain important. Critical factors that influence the accuracy ... [more ▼]

In the setting of a maternal GBS-screening program and successful implementation of the strategy, efforts to improve screening for GBS status remain important. Critical factors that influence the accuracy of detecting GBS maternal colonization are the choice of culture media, the body sites sampled, and the timing of sampling. The evolution of the different culture options to improve the GBS-screening strategy will be reviewed. Despite efforts related to sampling and culture procedures, false-negative GBS-screening contributing to continuing EOGBS cases and false-positive screening leading to unecessary IAP, occur. As GBS carriage is highly variable, the predictive values of GBS antenatal cultures are not always good predictors of the maternal GBS status at presentation for delivery. Rapid non-cultural GBS screening methods have been developed: antigenic tests are not sensitive enough to replace antenatal screening cultures but available real-time PCR have faired better in the detection of GBS. Real-time PCR tests could improve effectiveness of the screening-based strategy and lead to a further reduction of the incidence of EOGBS disease. However questions of costs and logistics remain unanswered. Either for therapy or for intrapartum chemoprophylaxis, penicillin G for its bactericidal activity and narrow spectrum, remains the agent of choice. But in the true penicillin allergic patients, clindamycin or erythromycin have been recommended as alternative drugs. However, probably as a consequence of the important use of macrolides, related drug resistance among streptococcal isolates is currently recognized in many countries. Epidemiology of resistance to antimicrobial agents will be presented. [less ▲]

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See detailComparing the effectiveness of alternative investigation methods for library environmental evaluation
Durieux, Nancy ULg; Pasleau, Françoise ULg

Conference (2010, June 16)

The use of new technologies and the merging of our libraries have led us to think about marketing our library services. At the same time, Belgian universities in the French Community decided to conduct ... [more ▼]

The use of new technologies and the merging of our libraries have led us to think about marketing our library services. At the same time, Belgian universities in the French Community decided to conduct the LibQual+ survey. We participated in the working group responsible for data analysis of this survey regarding our institution. This gave us an initial assessment of the level of user satisfaction in our library, pointing to general library strengths and weaknesses and highlighting several questions to be investigated further. We searched for alternative evaluation methods that could help us to validate the LibQual+ conclusions and to explore further certain issues regarding different library user groups (students / researchers / clinicians / academic professors). Methodologies for conducting focus groups, semi-structured interviews and participant observations are largely described in the literature. We propose to test and compare these methodologies in order to discover which method is the most appropriate for each type of user and how far these approaches may be complementary. We also want to verify whether these investigation strategies will lead to reproducible conclusions able to support strategic planning for the library. Lastly, we need to decide whether these methods could also be used to measure the impact of future marketing activities. It may be useful to share our working procedures, conclusions and experiences with colleagues involved in similar marketing challenge. [less ▲]

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See detailGuidelines and Validation Issues in Pharmaceutical Analysis
Rozet, Eric ULg; Rudaz, S.

Conference (2010, June 16)

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See detailExamen transversal des nouvelles dispositions
Biquet, Christine ULg; Blommaert, Dominique

Conference (2010, June 16)

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See detailFinding cartographic materials
Anceau, Annick ULg

Conference (2010, June 16)

Detailed reference viewed: 44 (30 ULg)
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See detailAutobiographical memory and future thinking
D'Argembeau, Arnaud ULg

Conference (2010, June 15)

Detailed reference viewed: 11 (1 ULg)
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See detailScoring-rule and the choice of a contractor by a financially constrained government
Gautier, Axel ULg

Conference (2010, June 15)

Governments and public authorities are increasingly relying on Public-Private Partnerships for the provision of public goods and services. It is often argued that the use of a public private partnership ... [more ▼]

Governments and public authorities are increasingly relying on Public-Private Partnerships for the provision of public goods and services. It is often argued that the use of a public private partnership can relieve the government from a strained budget constraint and, in this paper, we analyze the choice of a contractual solution for designing, constructing and managing a project, with observable externalities, by a budget-constrained government. We show that the quality of the project and the designed contractor are affected by the extent of the budget constraint and we show that the use of a PPP may partially overcome the resulting inefficiencies. [less ▲]

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See detailContrôle de la porosité résiduelle dans les pièces en acier inoxydable fabriquées par rapid manufacturing selon la technologie 3D printing.
Verlee, Bruno; Dormal, Thierry ULg; Lecomte-Beckers, Jacqueline ULg

Conference (2010, June 15)

Additive technologies offer the possibilities to build complex geometries with integrated functionalities, specific to target application. 3D-printing of metallic powder is an additive technology ... [more ▼]

Additive technologies offer the possibilities to build complex geometries with integrated functionalities, specific to target application. 3D-printing of metallic powder is an additive technology proceeding in 2 steps: a green part is first built layer by layer by printing a liquid binder on the powder bed, and then green part is debinded and sintered. As sintering occurs separately of shaping process, 3D-printing is one of the only additive techniques able to produce porous parts, as filters or other fluid permeable components. Different porous characteristics can be obtained by playing on process parameters. [less ▲]

Detailed reference viewed: 54 (5 ULg)