![]() Outils pour gérer l'hétérogénéité des élèves au cours de langues étrangères : synthèse critique d'une recherche-action menée avec de jeunes enseignants.Beckers, Jacqueline ; Simons, Germain ![]() in Actes du 4e Congrès des Chercheurs en Education. La qualité pour tous les élèves : l'école face aux inégalités (2006) Detailed reference viewed: 15 (2 ULg) Outils pour l'analyse d'une nouvelle de Marguerite Yourcenar (première partie)Dumortier, Jean-Louis ![]() in Enjeux : Revue de Formation Continuée et de Didactique du Français (1983), 2 Detailed reference viewed: 2 (0 ULg) Outils pour l'analyse d'une nouvelle de Marguerite Yourcenar (seconde partie)Dumortier, Jean-Louis ![]() in Enjeux : Revue de Formation Continuée et de Didactique du Français (1983), 3 Detailed reference viewed: 3 (0 ULg) Outils pour la maîtrise de la qualité nutritionnelle; Delacharlerie, Sophie ; Sindic, Marianne ![]() Scientific conference (2012, June 26) Detailed reference viewed: 23 (5 ULg) Outils pour le diagnostic et la remédiation des difficultés d'acquisition de la lecture en 1re et 2e années du primaireDeum, Mélanie ; ; Lafontaine, Annette et alReport (2007) L’apprentissage de la lecture constitue une étape importante pour les enfants; certains d’entre eux l’attendent avec impatience, d’autres le redoutent. La lecture est en effet un processus complexe, on le ... [more ▼] L’apprentissage de la lecture constitue une étape importante pour les enfants; certains d’entre eux l’attendent avec impatience, d’autres le redoutent. La lecture est en effet un processus complexe, on le sait: l’apprenti lecteur doit apprendre à maîtriser différentes stratégies mais aussi à les coordonner. Les obstacles peuvent donc se situer à différents niveaux et les difficultés peuvent s’ancrer très tôt dans la scolarité, d’autant que les élèves ne sont pas tous égaux lorsqu’ils débutent dans l’apprentissage de la lecture-écriture. Laisser passer l’occasion d’identifier les forces sur lesquelles on pourra s’appuyer, ou les points faibles pour y réagir de manière adéquate dès les étapes initiales de l’apprentissage peut être lourd de conséquences: les difficultés s’accumulent et augurent d’un parcours d’échecs qui peut brouiller les élèves précocement et parfois définitivement avec la lecture, faute d’un diagnostic et d’une remédiation mise en place en temps utile. On connaît toute l’importance de la lecture dans les autres apprentissages scolaires. Même s’il est vrai qu’on apprend à lire toute sa vie, un échec dans les apprentissages de base de la lecture ne se surmonte pas facilement. Or, les outils manquent dans les écoles pour poser un diagnostic fin des difficultés auxquelles certains élèves se heurtent dès leurs premiers pas dans les apprentissages. Les enseignants se sentent démunis face à la réalisation d’un diagnostic précis: ils disent qu’ils peuvent très tôt repérer un élève qui ne suit pas ou n’accroche pas, mais ne savent pas toujours détecter précisément ce qui fait obstacle. Par ailleurs, un sentiment de malaise par rapport à la gestion des difficultés et des différences de niveaux de lecture des élèves a été mis en évidence dans une enquête1 menée auprès d’un échantillon représentatif d’un millier d’enseignants de 1re et 2e années primaires. Très peu d’enseignants estiment être bien préparés pour faire face aux difficultés en lecture et avoir bénéficié d’une formation suffisante en matière de remédiation. Au-delà d’aides plus spécialisées (par l’intervention de logopèdes, par exemple) et du soutien que certains parents peuvent donner à leur enfant, il apparaît essentiel d’apporter une aide aux enseignants responsables de l’apprentissage initial de la lecture. [less ▲] Detailed reference viewed: 123 (2 ULg) Outils pour le diagnostic et la remédiation des difficultés en lecture en 3e et 4e années primairesSchillings, Patricia ; Lafontaine, Annette ![]() in Point sur la Recherche en Education (Le) (2009) Detailed reference viewed: 13 (1 ULg) Outils technologiques pour gérer la qualité microbiologique des alimentsClinquart, Antoine ![]() in Belgian Association for Meat Science and Technology (Ed.) Journée d’étude MICROBIOLOGIE ET VIANDE : QUE FAIRE DEMAIN ? (2006) Même si elles peuvent contribuer de manière très spectaculaire à la maîtrise de la qualité microbiologique des aliments, les techniques de conservation elles-mêmes ne sont pourtant qu’un moyen de maîtrise ... [more ▼] Même si elles peuvent contribuer de manière très spectaculaire à la maîtrise de la qualité microbiologique des aliments, les techniques de conservation elles-mêmes ne sont pourtant qu’un moyen de maîtrise parmi d’autres… Deux facteurs principaux sont tout simplement la qualité initiale –en particulier la qualité microbiologique- des aliments ou des ingrédients qui les constituent et l’hygiène observée au cours de leur production, de leur transformation et de leur distribution. De plus, un effet « obstacle » n’est reproductible que dans des conditions précises, par exemple pour ce qui concerne le nombre de microorganismes, la composition de l’aliment, les conditions d’ambiance, etc… Une technique de conservation doit donc être validée dans des conditions données (p.ex. par validation de la durée de vie microbiologique permettant d’estimer la D.L.C. d’un produit). Toute modification de ces conditions ne permet plus de garantir la maîtrise de la qualité microbiologique. Il convient par ailleurs d’évaluer l’effet d’une contamination accidentelle de la denrée par un microorganisme pathogène, au cours de sa production, de sa transformation ou de sa distribution (test de croissance après inoculation artificielle de la denrée, encore appelé « challenge testing »). L’établissement et le respect de critères microbiologiques, de bonnes pratiques de fabrication et de procédures d’assurance qualité sont des points clés de la maîtrise de la qualité et de la sécurité sanitaire des aliments. Des progrès significatifs sont en cours et sont encore attendus dans les prochaines années. [less ▲] Detailed reference viewed: 61 (3 ULg) Outlier detection in satellite data using spatial coherenceAlvera Azcarate, Aïda ; Sirjacobs, Damien ; Barth, Alexander et alin Remote Sensing of Environment (2012), 119 Satellite data sets often contain outliers (i.e., anomalous values with respect to the surrounding pixels), mostly due to undetected clouds and rain or to atmospheric and land contamination. A methodology ... [more ▼] Satellite data sets often contain outliers (i.e., anomalous values with respect to the surrounding pixels), mostly due to undetected clouds and rain or to atmospheric and land contamination. A methodology to detect outliers in satellite data sets is presented. The approach uses a truncated Empirical Orthogonal Function (EOF) basis. The information rejected by this EOF basis is used to identify suspect data. A proximity test and a local median test are also performed, and a weighted sum of these three tests is used to accurately detect outliers in a data set. Most satellite data undergo automated quality-check analyses. The approach presented exploits the spatial coherence of the geophysical fields, therefore detecting outliers that would otherwise pass such checks. The methodology is applied to infrared sea surface temperature (SST), microwave SST and chlorophyll-a concentration data over different domains, to show the applicability of the technique to a range of variables and temporal and spatial scales. A series of sensitivity tests and validation with independent data are also conducted. [less ▲] Detailed reference viewed: 60 (8 ULg) Outlier detection with the minimum covariance determinant estimator in practiceFauconnier, Cécile ; Haesbroeck, Gentiane ![]() in Statistical Methodology (2009), 6(4), 363-379 Robust statistics has slowly become familiar to all practitioners. Books entirely devoted to the subject are without any doubts responsible for the increased practice of robust statistics in all fields of ... [more ▼] Robust statistics has slowly become familiar to all practitioners. Books entirely devoted to the subject are without any doubts responsible for the increased practice of robust statistics in all fields of applications. Even classical books often have at least one chapter (or parts of chapters) which develops robust methodology. The improvement of computing power has also contributed to the development of a wider and wider range of available robust procedures. However, this success story is now menacing to get backwards: non specialists interested in the application of robust methodology are faced with a large set of (assumed equivalent) methods and with over-sophistication of some of them. Which method should one use? How the (numerous) parameters should be optimaly tuned? These questions are not so easy to answer for non specialists! One could then argue that default procedures are available in most statistical softwares (Splus, R, SAS, Matlab,...). However, using as illustration the detection of outliers in multivariate data, it is shown that, on one hand, it is not obvious that one would feel confident with the output of default procedures, and that, on the other hand, trying to understand thoroughly the tuning parameters involved in the procedures might require some extensive research. This is not conceivable when trying to compete with the classical methodology which (while clearly unreliable) is so straightfoward. The aim of the paper is to help the practitioners willing to detect in a reliable way outliers in a multivariate data set. The chosen methodology is the Minimum Covariance Determinant estimator being widely available and intuitively appealing. [less ▲] Detailed reference viewed: 130 (9 ULg) Outlier identification of differential item functioning in multiple groupsMagis, David ; 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 ▲] Detailed reference viewed: 26 (2 ULg) An outline of a regional forest inventory in BelgiumRondeux, Jacques ![]() in Mitteilungen der Abteilung für forstliche Biometrie (1985) This paper outlines the first forest inventory recently carried out in the Southern part of Belgium (Wallonia) where the forests cover about 530.000 hectares (or 33 % of the regional area). The main ... [more ▼] This paper outlines the first forest inventory recently carried out in the Southern part of Belgium (Wallonia) where the forests cover about 530.000 hectares (or 33 % of the regional area). The main objective was to estimate the standing volume of timber in the present conditions and to give, quickly, information dealing with the areas occupied according to different classifications. The inventory system used is based on temporary systematic sampling with an intensity of one plot per 50 hectares. [less ▲] Detailed reference viewed: 6 (0 ULg) Outlook of non operated type B aortic dissection with special reference to the incidence of degenerative abdominal aortic aneurysm (AAA). One center studyQuaniers, Janine ; CREEMERS, Etienne ; Limet, Raymond ![]() in Acta Chirurgica Belgica (2005), 105(5), 487-490 Objectives : to determine the value of pharmacological treatment of type B aortic dissection (B AD) in face of new forms of treatment. Design : this is a retrospective study of the period from 1990 to ... [more ▼] Objectives : to determine the value of pharmacological treatment of type B aortic dissection (B AD) in face of new forms of treatment. Design : this is a retrospective study of the period from 1990 to 2000. Files of 81 patients have been reviewed and completed by questionnaires. Results Two B AD died after admission without any treatment, 10 were operated on with 7 discharged alive (group 1) 69 received hypotensive agents and beta-blockers, 65 were discharged alive (group 11). Late mortality of the group I is 3/7, not related with B AD. Late mortality after mean follow-up of 56.8 months is 27/65 with 4/27 related to B AD (4 ruptures, 2 operated on). Non fatal secondary surgery amounts 5 in 4 patients. Total B AD aortic events comprise 8/65 patients. Type A AD were operated on successfully (8 : 4 before B AD, and 4 after B AD). Degenerative abdominal aortic aneurysms were present, operated (9) or not (3), in the history of patients and 3 more appear subsequently. At 10 years, actuarial survival is 40% +/- 18. Conclusion : in non-complicated cases of B AD, medical treatment is a reasonable choice, provided that a strict follow-up of the thoracic abdominal aorta is performed. [less ▲] Detailed reference viewed: 15 (0 ULg) Outpatient and home parenteral antibiotic therapy (OHPAT) in low-risk febrile neutropenia: consensus statement of a Belgian panel.Beguin, Yves ; ; et alin Acta Clinica Belgica (2002), 57(6), 309-16 Febrile neutropenia requires adequate antibiotic treatment. A subgroup of patients are only at low risk for complications and could be treated at home/as outpatients (OHPAT) after a short initial ... [more ▼] Febrile neutropenia requires adequate antibiotic treatment. A subgroup of patients are only at low risk for complications and could be treated at home/as outpatients (OHPAT) after a short initial admission for work up. This position paper by a Belgian panel of experts presents criteria defining low-risk in febrile neutropenia, gives an overview of the existing experience and examines the present obstacles to a more widespread use of OHPAT in this country. [less ▲] Detailed reference viewed: 31 (1 ULg) Output-only modal analysis using blind source separation techniquesPoncelet, Fabien ; Kerschen, Gaëtan ; Golinval, Jean-Claude et alin Mechanical Systems & Signal Processing (2007), 21(6), 2335-2358 The present study carries out output-only modal analysis using two blind source separation (BSS) techniques, namely independent component analysis and second-order blind identification. The concept of ... [more ▼] The present study carries out output-only modal analysis using two blind source separation (BSS) techniques, namely independent component analysis and second-order blind identification. The concept of virtual source is exploited and renders the application of these BSS techniques possible. The proposed modal analysis method is illustrated using numerical and experimental examples. (c) 2007 Elsevier Ltd. All rights reserved. [less ▲] Detailed reference viewed: 34 (9 ULg) An outreach experienceNazé, Yaël ![]() in European Planetary Science Congress 2006 (2006) In our technological world, Science is everywhere and to participate to the public debates, citizens will need some basic scientific notions. Raising awareness of the public in Science is thus always ... [more ▼] In our technological world, Science is everywhere and to participate to the public debates, citizens will need some basic scientific notions. Raising awareness of the public in Science is thus always worthwhile, even though only a small fraction of the audience will envisage a career in the field. Bringing science to the layman should even be a duty for scientists: we should not forget that we are paid by taxpayers, and are part of a public service; and besides, people tend to reject things that they do not understand - to get support, scientists need to enter the public arena and confront the crowd. Relying on attractive images and a timeless fascination, astronomy is particularly suited to do that. But what should a willing astronomer do to share (his/her) knowledge? There is certainly no definitive answer for that, but a few hints can still be given. Based on personal experience, this talk will present a few tips and things to avoid in three cases: animations (for kids and grown-ups), writing, and talking. [less ▲] Detailed reference viewed: 9 (1 ULg) Outreach goals of the Europa Jupiter System Mission; ; Nazé, Yaël et alPoster (2009) Detailed reference viewed: 8 (0 ULg) Les outsiders, ou le retour de la norme : à propos des Goncourt francophonesProvenzano, François ![]() in Discours social (2008), XXX Detailed reference viewed: 17 (1 ULg) Outskirts Dynamics and new Residential Developments in Belgium. A comparative Analysis with the Swiss and Danish ContextsHalleux, Jean-Marie ![]() in Franzen, M.; Halleux, Jean-Marie (Eds.) European Cities, Insight on Outskirts. Dynamics (2004) Detailed reference viewed: 48 (9 ULg) Outskirts Dynamics: towards Order or Chaos ?; Halleux, Jean-Marie ![]() in Franzen, M.; Halleux, Jean-Marie (Eds.) European Cities, Insight on Outskirts. Dynamics (2004) Detailed reference viewed: 3 (0 ULg) Outskirts, Accessibility and Chain Reactions within the Urban Field. The Dynamics of the Released MobilityHalleux, Jean-Marie ![]() in Franzen, M.; Halleux, Jean-Marie (Eds.) European Cities, Insight on Outskirts. Dynamics (2004) Detailed reference viewed: 11 (1 ULg) |
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