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See detailPerformance on a Computerized Shopping Task in Bipolar Disorder and Alcohol Dependency
Laloyaux, Julien ULg; Michel, Céline; Pellegrini, Nadia et al

Poster (2014, August 10)

Persons diagnosed with bipolar disorder and alcohol dependency are frequently subject to cognitive impairments and encounter difficulties during everyday life activities. However, little is known how ... [more ▼]

Persons diagnosed with bipolar disorder and alcohol dependency are frequently subject to cognitive impairments and encounter difficulties during everyday life activities. However, little is known how these deficits interact in real life. Moreover, previous studies have primarily used questionnaires or observational methods to assess everyday life functioning, both of which contain a number of limits. In order to address some of these limits, we developed a computerized real-life activity task, in particular, a shopping task where participants are required to shop for a list of 8 grocery store items in a virtual supermarket. Twenty individuals diagnosed with alcoholic dependence and 21 patients diagnosed with bipolar disorder were compared with healthy controls (20 and 21, respectively), matched for age, sex and educational level. All participants completed the shopping task, and both clinical groups were evaluated with an extensive battery of cognitive tests (assessing executive functioning, attention, processing speed and memory), clinical scales and a measure of real world functioning. Results showed that, for both clinical groups, performance on the computerized shopping task significantly differentiated patients and healthy controls for a number of variables, especially total time to complete the shopping task. Performances on shopping task variables, in both clinical groups, were also significantly correlated with cognitive tests measuring processing speed, episodic memory, cognitive flexibility and inhibition. Finally, performances on the computerized shopping task were significantly correlated with real world functioning in both patient groups. These findings suggest that the computerized task used in the present study provides a valid indication of the level of real world functioning for these clinical populations, and therefore may be viewed as a valuable instrument in both an evaluation and remediation context. [less ▲]

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See detailPerformance on a computerized shopping task significantly predicts real world functioning in persons diagnosed with bipolar disorder.
Laloyaux, Julien ULg; Pellegrini, Nadia; Mourad, Haitham et al

in Psychiatry Research (2013), 210(2), 465-471

Persons diagnosed with bipolar disorder often suffer from cognitive impairments. However, little is known concerning how these cognitive deficits impact their real world functioning. We developed a ... [more ▼]

Persons diagnosed with bipolar disorder often suffer from cognitive impairments. However, little is known concerning how these cognitive deficits impact their real world functioning. We developed a computerized real-life activity task, where participants are required to shop for a list of grocery store items. Twenty one individuals diagnosed with bipolar disorder and 21 matched healthy controls were administered the computerized shopping task. Moreover, the patient group was assessed with a battery of cognitive tests and clinical scales. Performance on the shopping task significantly differentiated patients and healthy controls for two variables: Total time to complete the shopping task and Mean time spent to consult the shopping list. Moreover, in the patient group, performance on these variables from the shopping task correlated significantly with cognitive functioning (i.e. processing speed, verbal episodic memory, planning, cognitive flexibility, and inhibition) and with clinical variables including duration of illness and real world functioning. Finally, variables from the shopping task were found to significantly explain 41% of real world functioning of patients diagnosed with bipolar disorder. These findings suggest that the shopping task provides a good indication of real world functioning and cognitive functioning of persons diagnosed with bipolar disorder. [less ▲]

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See detailPerformance on an everyday life activity in persons diagnosed with alcohol dependency compared to healthy controls: Relations between a computerized shopping task and cognitive and clinical variables.
Laloyaux, Julien ULg; Michel, Céline; Mourad, Haitham et al

in Alcohol & Alcoholism (2012), 47(3), 240-247

Aim: Persons diagnosed with alcohol dependency often suffer from cognitive impairments. Little is known, however, concerning how these cognitive deficits impact complex, everyday life activities. By this ... [more ▼]

Aim: Persons diagnosed with alcohol dependency often suffer from cognitive impairments. Little is known, however, concerning how these cognitive deficits impact complex, everyday life activities. By this experiment, we wished to contribute to a better characterization of the nature of everyday life difficulties in patients with alcohol dependency using a computerized shopping task. Methods: We developed a computerized real-life activity task (shopping task), where participants are required to shop for a list of 8 grocery store items. Twenty individuals diagnosed with alcohol dependency and 20 healthy controls were administered a battery of cognitive tests, clinical scales and the computerized shopping task. Results: Performance on the computerized shopping task significantly differentiated patients and healthy controls for several variables and in particular for Total time. Moreover, Total time to complete the task correlated significantly with several cognitive measures. In particular, poor performance on measures of processing speed, verbal episodic memory, cognitive flexibility and inhibition were significantly correlated with longer Total time. Finally, longer Total time was significantly correlated with poorer everyday life functioning and longer duration of illness. Conclusions: These findings suggest that the computerized task used in the present study is a good proxy measure of the level of everyday life and cognitive functioning of persons diagnosed with alcohol dependency. [less ▲]

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See detailPerformance relative des règles linéaire, quadratique et logistique en analyse discriminante
Glele Kakaï, R.; Palm, Rodolphe ULg

in XXXVIèmes Journées de Statistique (2004, May)

Monte Carlo study is achieved to compare linear, quadratic and logistic classification rules for two groups, in 480 situations related to the type of distribution, the overlap of the populations, the ... [more ▼]

Monte Carlo study is achieved to compare linear, quadratic and logistic classification rules for two groups, in 480 situations related to the type of distribution, the overlap of the populations, the number of variables, the sample size and the heteroscedasticity degree of the model, which is measured by a parameter gamma defined in the study. The results of this study show that the quadratic rule is the best only for severe heteroscedastic normal or moderate non-normal models with high overlap. The linear rule is the best for homoscedastic normal or moderate non-normal models with low overlap. The logistic rule is the best for severe non-normal models except when homoscedasticity occurs. In the order situations linear and logistic rules have almost the same performance. By considering the parameters computed on the data samples, the linear rule gives the best performance for high values of r whereas logistic rule performs is best for low or moderate values of the same parameter. [less ▲]

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See detailLa performance sociétale
Crutzen, Nathalie ULg

Article for general public (2010)

Detailed reference viewed: 56 (12 ULg)
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See detailPerformance Study of an Overlay Approach to Active Routing in Ad Hoc Networks
Calomme, Sandrine; Leduc, Guy ULg

(2004, June)

We motivate the use of the active technology for routing in ad hoc networks. We present an active architecture where passive and active nodes can operate together, avoiding any change in the legacy muti ... [more ▼]

We motivate the use of the active technology for routing in ad hoc networks. We present an active architecture where passive and active nodes can operate together, avoiding any change in the legacy muti-hop routing protocol they use. We detail a basic reactive protocol which can be used to build any overlay on top of an ad hoc network. We model it as an active application called Re-Active Routing (RAR). RAR provides dynamic routing in dense and sparse active overlays. We investigate its performance in static and dynamic environments and show that it depends substantially on the active range, i.e. on the allowed maximal number of hops between two active nodes. For a well-chosen active range, RAR achieves good performance even if the mobility level is high and the overlay density is as low as 12.5 %. [less ▲]

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See detailPerformance study of ground-based infrared Bracewell interferometers. Application to the detection of exozodiacal dust disks with GENIE
Absil, Olivier ULg; den Hartog, R.; Gondoin, P. et al

in Astronomy and Astrophysics (2006), 448

Nulling interferometry, a powerful technique for high-resolution imaging of the close neighbourhood of bright astrophysical objets, is currently considered for future space missions such as Darwin or the ... [more ▼]

Nulling interferometry, a powerful technique for high-resolution imaging of the close neighbourhood of bright astrophysical objets, is currently considered for future space missions such as Darwin or the Terrestrial Planet Finder Interferometer (TPF-I), both aiming at Earth-like planet detection and characterization. Ground-based nulling interferometers are being studied for both technology demonstration and scientific preparation of the Darwin/TPF-I missions through a systematic survey of circumstellar dust disks around nearby stars. In this paper, we investigate the influence of atmospheric turbulence on the performance of ground-based nulling instruments, and deduce the major design guidelines for such instruments. End-to-end numerical simulations allow us to estimate the performance of the main subsystems and thereby the actual sensitivity of the nuller to faint exozodiacal disks. Particular attention is also given to the important question of stellar leakage calibration. This study is illustrated in the context of GENIE, the Ground-based European Nulling Interferometer Experiment, to be installed at the VLTI and working in the L' band. We estimate that this instrument will detect exozodiacal clouds as faint as about 50 times the Solar zodiacal cloud, thereby placing strong constraints on the acceptable targets for Darwin/TPF-I. [less ▲]

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See detailA performance study of RSVP with proposed extensions
Mathy, Laurent ULg; Hutchison, D.; Schmid, S. et al

in Computer Communications (2002), 25(18), 1782--1798

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See detailPerformance, slaughter characteristics and meat quality of young bulls from Belgian Blue, Limousin and Aberdeen Angus breeds fattened with a sugar-beet pulp or a cereal-based diet
Cuvelier, Christine ULg; Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg et al

in Animal Science (2006), 82(Part 1), 125-132

Thirty-six young fattening bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over 5 months with fattening diets based either on sugar-beet pulp or on cereals. Fattening ... [more ▼]

Thirty-six young fattening bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over 5 months with fattening diets based either on sugar-beet pulp or on cereals. Fattening performance as well as carcass and meat characteristics were measured. There were few relevant effects of the diets on the parameters. The breeds also showed similar fattening features. However, the BB had higher killing-out proportion and their carcasses presented better scores in terms of conformation and fattening. The meat quality of the breeds differed, especially in terms of luminosity, redness and cooking losses. There were also significant influences of breed on the chemical composition of meat; fat content was lowest in Belgian Blue and highest in Aberdeen Angus. Such specificities could help to allocate breeds in appropriate niches in Belgium. [less ▲]

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See detailPerformance-based Approaches for high strength Tubular columns and connections under Earthquake and fire Loadings (ATTEL) - D4
Sommariva, Manuel; Maio, Daniele; Demonceau, Jean-François ULg et al

Report (2012)

Fire test data

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See detailPerformances and limitations of the HRMS method for dioxins, furans and dioxin-like PCBs analysis in animal feedingstuffs Part I: Results of an inter-laboratory study
Eppe, Gauthier ULg; Cofino, W. P.; De Pauw, Edwin ULg

in Analytica Chimica Acta (2004), 519(2), 231-242

The European strategy for dioxin monitoring of the food chain has defined high-resolution gas chromatography coupled to high-resolution mass spectrometry (HRGC/HRMS) method as the confirmatory method that ... [more ▼]

The European strategy for dioxin monitoring of the food chain has defined high-resolution gas chromatography coupled to high-resolution mass spectrometry (HRGC/HRMS) method as the confirmatory method that can provide reliable and comparable results at sub-parts per trillion (ppt) level. This paper describes the first inter-laboratory study on dioxins, furans and dioxin-like PCBs by HRGC/HRMS method in animal feedingstuffs. Two different statistical approaches (ISO 5725 and Cofino's statistics) were used for the statistical evaluation. For this particular study, the performances of the HRGC/HRMS method seem to be congener-independent in repeatability and reproducibility conditions over a concentration range covering more than four orders of magnitude. Results clearly show the effect of precision loss below 0.1 ppt level per congener in repeatability conditions and below 0.2 ppt level per congener in reproducibility conditions. LODs reported by the laboratories give median values of 0.02 ng/kg for most of the toxic congeners. Relative standard deviation between the laboratories' mean values using upper-bound approach for TEQ calculation is 6.2%, more than twice the maximum level set at 0.75 ng TEQ/kg of product. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailPerformances and limitations of the HRMS method for dioxins, furans and dioxin-like PCBs analysis in animal feedingstuffs Part II: Does it comply with the European pro-active approach?
Eppe, Gauthier ULg; Maghuin-Rogister, Guy ULg; De Pauw, Edwin ULg

in Analytica Chimica Acta (2004), 519(2), 243-253

Based on the results obtained from the inter-laboratory study in Part 1, different approaches for detection and quantification limits are evaluated and discussed. An overview of the most commonly used ... [more ▼]

Based on the results obtained from the inter-laboratory study in Part 1, different approaches for detection and quantification limits are evaluated and discussed. An overview of the most commonly used concepts and terminologies in analytical chemistry is presented with the aim of establishing a link between them. Whatever the method used by laboratories for detection limit assessment, the median LOD value reported for the less chlorinated PCDD/Fs (i.e. 0.02 ng/kg) is in good agreement with the values recalculated using the inter-laboratory data. For LOQ the Eurachem approach based on a pre-established percentage of repeatability RSD appears to be. suitable. The study shows that a pre-established RSDr of 20% is recommended in order to achieve an acceptable LOQ of 0.05 ng/kg per congener. The 20% value seems to be sufficiently low to act tolerable RSD close to maximum limits. Furthermore, the repeatability and the reproducibility standard deviation against parts-per-trillion congener levels has been modeled by inverse first order functions. This congener precision model provides an interesting tool to subsequently assess the performances of the method in TEQ close to regulatory limits. Finally, the paper discusses two different ways of reporting and interpreting the results to assess compliance against statutory limits. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailPerformances de croissance et aptitudes bouchères du Poulet Kabyle
Moula, Nassim ULg; Antoine-Moussiaux, Nicolas ULg; Ait Kaki, Asma ULg et al

Poster (2012, May 27)

Face à la hausse rapide de la consommation mondiale de viande de volaille et afin de s’inscrire dans la perspective d’un développement durable, l’aviculture a connu et connaîtra encore de profondes ... [more ▼]

Face à la hausse rapide de la consommation mondiale de viande de volaille et afin de s’inscrire dans la perspective d’un développement durable, l’aviculture a connu et connaîtra encore de profondes mutations. L’expansion rapide de l’élevage intensif de souches hybrides, génétiquement uniformes, se réalise au détriment des races locales de poules. Ces dernières constituent pourtant un outil central du développement socio-économique rural dans diverses régions du monde. Le but de cette étude est d’étudier les performances de croissance du Poulet Kabyle en production intensive. L’expérimentation s’est déroulée dans la Région de Basse Kabylie et a consisté en deux essais consécutifs de mars à juin 2010 (n=150 poussins) et d’août à novembre 2010 (n=155 poussins). À l’éclosion, le poids moyen des poussins de la première répétition (mâles : 41,29 g, femelles : 36,26 g) n’était pas significativement différent (p>0,05) de celui de la deuxième répétition (mâles : 37,30 g, femelles : 31,94 g). A la fin de l’expérimentation, les poulets de la première répétition présentaient un poids significativement (p<0,05) supérieur à ceux de la deuxième répétition (mâles : 1978,93 g, femelles : 1448,57 g vs. mâles : 1803,30 g, femelles : 1234,48 g). L'étude des différents paramètres de la courbe de croissance (modèle de Gompertz) a révélé des valeurs différentes selon le sexe et la répétition. Aucune différence significative (p>0,05) n’a été observée entre les mortalités, les poids moyens à l’abattage, les rendements, les pH des muscles, des animaux des deux répétitions. Le poids moyen à l’abattage des mâles et leur rendement a été significativement (p<0,05) supérieur à celui des femelles. Les pH des muscles se stabilisent à une valeur appelée pH ultime variant de 5,68 à 5,81. [less ▲]

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See detailPerformances de production de la population de poules locales de la Wilaya de Bejaia
Ait Kaki, Asma ULg; Moula, Nassim ULg; Antoine-Moussiaux, Nicolas ULg et al

Poster (2013, November 30)

Cette étude a pour objectif d’évaluer le potentiel productif de la population de poules locales de la Wilaya de Bejaia, en caractérisant d’une part les performances de croissance, et d’autre part les ... [more ▼]

Cette étude a pour objectif d’évaluer le potentiel productif de la population de poules locales de la Wilaya de Bejaia, en caractérisant d’une part les performances de croissance, et d’autre part les performances de ponte. Le suivi de la croissance des poulets a été effectué sur 204 poussins durant 17 semaines d’élevage (de mars à juin 2011). A 12 semaines d’âge, le taux de mortalité était de 9,31 % et l’indice de consommation était de 4,03. La modélisation de la courbe de croissance au moyen des équations de Gompertz a permis d’obtenir les relations suivantes : pour les mâles : Y(g)=2409e^((-3,68)〖 e〗^((-0,0260 t) ) ) pour les femelles : Y(g)=1835e^((-3,71)〖 e〗^((-0,0294 t) ) ) avec y, le poids corporel en grammes et t, l’âge des animaux en jours. Les performances de ponte ont été étudiées chez 38 poules durant 52 semaines (d’août 2011 à août 2012). En moyenne, la ponte débute à l’âge de 166 jours à un poids corporel de 1334g. La poule pond en moyenne 173 œufs par an d’un poids moyen variant avec l’âge de la poule, de 44 à 53g. Au vu de ces résultats, il apparaît que les poules locales de Bejaia constituent un réservoir génétique prometteur tant pour leurs performances de croissance que de ponte. Les données obtenues dans cette étude permettent d'envisager un usage des poules locales dans le cadre d'une production de qualité différenciée, en élevage pur ou en croisement. La selection de ce réservoir génétique permettra de produire une véritable race sur base de la population locale, ayant fixés les caractères désirés et reconnus par les éleveurs comme étant propres à la poule locale. [less ▲]

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See detailLes performances de quelques GPS portables en milieu forestier
Lejeune, Philippe ULg; Rondeux, Jacques ULg

in Forêt Wallonne (2007), (88), 28-36

Cinq récepteurs GPS ont été testés afin d’évaluer leur précision dans les conditions particulières du travail en forêt. Si la précision des modèles oscille parfois fortement, elle est à mettre en ... [more ▼]

Cinq récepteurs GPS ont été testés afin d’évaluer leur précision dans les conditions particulières du travail en forêt. Si la précision des modèles oscille parfois fortement, elle est à mettre en parallèle, lors de l’acquisition d’un tel appareil, avec son prix d’achat et le type d’utilisation prévue. [less ▲]

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See detailLes performances des organisations africaines Pratiques de gestion en contexte incertain
Pichault, François ULg; Nizet, jean; Mbangala, Mapapa ULg et al

Book published by harmattan (2007)

Detailed reference viewed: 47 (11 ULg)
See detailLes performances des organisations africaines. Pratiques de gestion en contexte incertain
Nizet, Jean; Pichault, François ULg

Book published by L'Harmattan - postface de Pierre Louart (2007)

Les organisations africaines seraient peu performantes. Leurs dirigeants seraient mal formés, ils seraient marqués par une mentalité traditionnelle peu conciliable avec la modernité managériale et la ... [more ▼]

Les organisations africaines seraient peu performantes. Leurs dirigeants seraient mal formés, ils seraient marqués par une mentalité traditionnelle peu conciliable avec la modernité managériale et la recherche de la rentabilité, etc. Les auteurs de l’ouvrage ont voulu déconstruire ce cliché. Dans une quinzaine de contributions qui se réfèrent à des approches disciplinaires variées (anthropologie, économie, sociologie, gestion), ils analysent de près les spécificités des entreprises d’Afrique sub-saharienne (leur ancrage familial et communautaire, l’incidence qu’ont sur elles les croyances magico-religieuses, etc.) et ils explorent l’apport d’outils de gestion tantôt inspirés des traditions locales (tontine d’entreprise, conseil des sages, etc.), tantôt importés de l’Occident (qualité totale, externalisation, etc.). Il en ressort une image contrastée des facteurs contribuant à la performance des organisations africaines ainsi que des pistes susceptibles de l’améliorer de façon durable. [less ▲]

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See detailPerformances en lecture et contexte éducatif : enquête internationale menée auprès d'élèves de 9 et 14 ans
Lafontaine, Dominique ULg

Book published by De Boeck Université (1996)

Ce livre présente les résultats d'une enquête standardisée comparative menée en 1991 sur le niveau de compréhension en lecture des élèves de 9-10 ans et de 14-15 ans dans 32 systèmes scolaires.

Detailed reference viewed: 57 (0 ULg)