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See detailEnseigner la géographie à l'Université. Quelques réflexions sur la didactique universitaire
Merenne-Schoumaker, Bernadette ULg

in Acta Geographica Lovaniensia (1992), (33), 67-75

Les recherches en didactique de la géographie se sont multipliées dans les années 1980 mais elles ne concernaient que l'enseignement primaire et secondaire. Le propos de cet article est d'explorer la ... [more ▼]

Les recherches en didactique de la géographie se sont multipliées dans les années 1980 mais elles ne concernaient que l'enseignement primaire et secondaire. Le propos de cet article est d'explorer la didactique dans l'enseignement universitaire en utilisant trois voies majeures: des travaux de pédagogie universitaire; notre propre pratique pédagogique; et nos recherches dans le cadre d'un cours assuré en 3e cycle à l'Université, cours intitulé "Méthodologie de l'enseignement supérieur". [less ▲]

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See detailEnseigner la géographie aujourd'hui
Merenne-Schoumaker, Bernadette ULg

in Mathé, R. (Ed.) Enseigner la Géographie dans les Pays Francophones (1989)

Réflxions sur la géographie en tant que discipline scolaire

Detailed reference viewed: 16 (0 ULg)
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See detailEnseigner la musicologie du rock ?
Pirenne, Christophe ULg

in Orphée Apprenti (2013), 4

Detailed reference viewed: 17 (5 ULg)
See detailEnseigner la pédologie opérationnelle en faculté d'agronomie
Bock, Laurent ULg

Scientific conference (2004, March 17)

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See detailEnseigner le français à l’école maternelle
Lucchini, Silvia ULg

Conference given outside the academic context (2010)

Detailed reference viewed: 66 (8 ULg)
See detailEnseigner les langues dans le fondamental : un métier difficile, mais plutôt apprécié
Straeten, M.; Blondin, Christiane ULg

in (Re)trouver le plaisir d'enseigner et d'apprendre : construire savoirs et compétences : actes du 3e congrès des chercheurs en éducation (2004)

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See detailEnseigner pour diminuer les inégalités : point de vue sur la profession des enseignants et le rôle de la formation
Beckers, Jacqueline ULg; Aelterman, Antonia

in École School+ : Plate-forme pour une école sans exclusion (2008)

Detailed reference viewed: 17 (1 ULg)
See detailEnseigner, entre réussir et comprendre, théorie implicite de l'éducation et pensée des enseignants-experts : essai de recadrage socioconstructiviste
Crahay, Marcel ULg

in Otte, Jeannine (Ed.) Recherche, pratique et savoirs en éducation (2002)

Detailed reference viewed: 79 (5 ULg)
See detailUn ensemble augusto-tibérien découvert à Aalter (Flandre orientale, Belgique) et les premières importations de céramique gallo-belge dans le civitas menapiorum
Deru, Xavier ULg

in Rivet L. (Ed.) Actes de la Société française d’étude de la céramique en Gaule, Langres 2007 (2007)

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See detailEnsemble des observations physiques de la planète Mars à Louvain en 1888 par M. Terby : rapport de F. Folie
Folie, François ULg

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1888), 3e série, t. 17(4), 309-311

The author establishes a report on the Mr. Terby’s work on all the planet Mars physical observations in Leuven in 1888

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See detailL’ensemble Musique Nouvelle et les musiques nouvelles en Wallonie et à Bruxelles
Pirenne, Christophe ULg; Dufour, Valérie; Decroupet, Pascal

Book published by Mardaga (2004)

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See detailEnsemble perturbation smoother for optimizing tidal boundary conditions by assimilation of High-Frequency radar surface currents - application to the German Bight
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Gurgel, Klaus-Werner et al

in Ocean Science (2010), 6(1), 161-178

High-Frequency (HF) radars measure the ocean surface currents at various spatial and temporal scales. These include tidal currents, wind-driven circulation, density-driven circulation and Stokes drift ... [more ▼]

High-Frequency (HF) radars measure the ocean surface currents at various spatial and temporal scales. These include tidal currents, wind-driven circulation, density-driven circulation and Stokes drift. Sequential assimilation methods updating the model state have been proven successful to correct the density-driven currents by assimilation of observations such as sea surface height, sea surface temperature and in-situ profiles. However, the situation is different for tides in coastal models since these are not generated within the domain, but are rather propagated inside the domain through the boundary conditions. For improving the modeled tidal variability it is therefore not sufficient to update the model state via data assimilation without updating the boundary conditions. The optimization of boundary conditions to match observations inside the domain is traditionally achieved through variational assimilation methods. In this work we present an ensemble smoother to improve the tidal boundary values so that the model represents more closely the observed currents. To create an ensemble of dynamically realistic boundary conditions, a cost function is formulated which is directly related to the probability of each boundary condition perturbation. This cost function ensures that the boundary condition perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimensional General Estuarine Ocean Model (GETM). Optimized boundary values are obtained by assimilating all observations using the covariances of the ensemble simulation. [less ▲]

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See detailEnsemble smoother for optimizing tidal boundary conditions and bottom roughness by assimilation of High-Frequency Radar surface currents
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Staneva, J. et al

Conference (2009, September)

High-Frequency (HF) radars measure the ocean currents at various spatial and temporal scales. These include tidal currents, wind-driven circulation, density-driven circulation and Stokes drift. Sequential ... [more ▼]

High-Frequency (HF) radars measure the ocean currents at various spatial and temporal scales. These include tidal currents, wind-driven circulation, density-driven circulation and Stokes drift. Sequential assimilation methods updating the model state have been proven successful to correct the density-driven currents by assimilation of observations such as sea surface height, sea surface temperature and in-situ profiles. However, the situation is different for tides in coastal models since these are not generated within the domain, but are rather propagated inside the domain through the boundary conditions. For improving the modeled tidal variability it is therefore not sufficient to update the model state via data assimilation without updating the boundary conditions. The optimization of boundary conditions to match observations inside the domain is traditionally achieved through variational assimilation methods. In this work we present an ensemble smoother to improve the tidal boundary values so that the model represents more closely the observed currents. To create an ensemble of dynamically realistic boundary conditions, a cost function is formulated which is directly related to the probability of each perturbation. This cost function ensures that the perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimension General Estuarine Ocean Model (GETM). Optimized boundary values are obtained using all observations within the assimilation period using the covariances of the ensemble simulation. [less ▲]

Detailed reference viewed: 45 (10 ULg)
See detailEnsemble smoother for optimizing tidal boundary conditions and wind forcing by assimilation of High-Frequency Radar surface currents measurements of the German Bight
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Staneva, Joanna et al

Conference (2010)

An ensemble smoother scheme is presented to assimilate HF radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of ... [more ▼]

An ensemble smoother scheme is presented to assimilate HF radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of dynamically realistic tidal boundary conditions, a cost function is formulated which is directly related to the probability of each perturbation. This cost function ensures that the perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimensional General Estuarine Ocean Model (GETM). Optimized boundary values are obtained using all observations within the assimilation period using the covariances of the ensemble simulation. The approach acts like a smoother scheme since all observations are taken into account. Since the scheme aims to derive the optimal perturbation, it might be called Ensemble Perturbation Smoother. The final analysis is obtained by rerunning the model using the optimal perturbation to the boundary conditions. The analyzed model solution satisfies thus the model equations exactly and does not suffer from spurious adjustments often observed with sequential assimilation schemes. Model results are also compared to independent tide gage data. The assimilation did also reduce the model error compared to those sea level observations. The same scheme has also been used to correct surface winds. Surface winds are crucial for accurately modeling the marine circulation in coastal waters. The method is validated directly by comparing the analyzed wind speed to in situ measurements and indirectly by assessing the impact of the corrected winds on sea surface temperature (SST) relative to satellite SST. [less ▲]

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See detailEnsemble-based assimilation of high-frequency radar surface currents in regional ocean models
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg et al

Conference (2010)

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by ... [more ▼]

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by uncertainty in those forcing fields. Since high-frequency (HF) radar installations provide measurements over a relatively large area, the assimilation of these data has a high potential to reduce the errors in ocean models and to provide a dynamically consistent estimation of the ocean circulation. The assimilation of HF radar data is not without its own challenges: the spatial variation of the surface currents uncertainty, the high temporal resolution of HF radar data, the simultaneous presence of a wide range of processes with distinct spatial and temporal scales (tides and other surface gravity waves, mesoscale and wind-driven circulation), and the generally strong sensitivity of regional models to errors in the boundary conditions and atmospheric forcings. These processess are important aspects to consider in the application of data assimilation methods to HF radar measurements. The results of two data assimilation experiments on the West Florida Shelf (WFS) and the German Bight are presented. HF radar currents are assimilated in a nested West Florida Shelf based on an ensemble of model realizations with different wind forcings. The model is sequentially updated and a filter is implemented to reduce spurious surface-gravity waves. Results of the WFS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth compared to independent ADCP observations. This West Florida Shelf assimilation experiment does not include tides. Tides are not generated within the domain, but are rather propagated inside the domain through the boundary conditions. The potential of using HF radar data to reduce errors in tidal boundary conditions is shown in a model setup of the German Bight. For improving the modeled tidal variability it is not sufficient to update the model state without updating the boundary conditions. An ensemble smoother to improve the tidal boundary values is presented and validated with independent HF radar measurements and tide-gage data. The ensemble-scheme is also applied to improve the wind forcing by assimilation of surface currents. The improvement of the analyzed wind forcing is assessed by using in-situ wind measurements. [less ▲]

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See detailLes ensembles de données comptables centralisés: un exemple d'analyse, un débat sur leur aide potentielle en gestion de PME
De Bruyn, Christian; Corhay, Albert ULg

in Wilkin, Jacques; Dubois, Daniel (Eds.) L'informatique de gestion à la portée des P.M.E. (1981)

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See detailEnsembles of extremely randomized trees and some generic applications
Wehenkel, Louis ULg; Ernst, Damien ULg; Geurts, Pierre ULg

in Proceedings of Robust Methods for Power System State Estimation and Load Forecasting (2006)

In this paper we present a new tree-based ensemble method called “Extra-Trees”. This algorithm averages predictions of trees obtained by partitioning the inputspace with randomly generated splits, leading ... [more ▼]

In this paper we present a new tree-based ensemble method called “Extra-Trees”. This algorithm averages predictions of trees obtained by partitioning the inputspace with randomly generated splits, leading to significant improvements of precision, and various algorithmic advantages, in particular reduced computational complexity and scalability. We also discuss two generic applications of this algorithm, namely for time-series classification and for the automatic inference of near-optimal sequential decision policies from experimental data. [less ▲]

Detailed reference viewed: 52 (5 ULg)