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See detailProper Orthogonal Decomposition and Model Reduction of Nonlinear Systems
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg

in European Cost F3 Conference on system Identification & Structural Health Monitoring, Madrid, 2000 (2000)

This work deals with the application of the proper orthogonal decomposition (POD) to structural dynamics. On one hand, a physical interpretation of the proper orthogonal modes (POM) is given using the ... [more ▼]

This work deals with the application of the proper orthogonal decomposition (POD) to structural dynamics. On one hand, a physical interpretation of the proper orthogonal modes (POM) is given using the singular value decomposition (SVD). It is shown that the POM converge to the normal modes under some circumstances. On the other hand, the POM are exploited for model reduction purposes. The efficiency of the reduced model for the prediction of the response is tested on a nonlinear beam. The comparison with another reduced model obtained via the normal modes of the linearised system points out that the POM are optimal for the reconstruction of the dynamics of a system. [less ▲]

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See detailDetection, localisation and identification of nonlinearities in structural dynamics
Lenaerts, Vincent; Kerschen, Gaëtan ULg; Trandafilova, Irina et al

in International Conference on noise and vibration Engineering, Leuven, 2000 (2000)

This paper discusses procedures for nonlinearity detection, localisation and identification in structures from time domain vibration measurements. The detection and the localisation techniques use pattern ... [more ▼]

This paper discusses procedures for nonlinearity detection, localisation and identification in structures from time domain vibration measurements. The detection and the localisation techniques use pattern recognition tools and are based on a dissimilarity measure between the signals coming from a linear structure and the corresponding nonlinear one. The detection procedure distinguishes between linear structures and structures with a nonlinearity employing nearest neighbour techniques. The localisation procedure combines substructuring with a nonlinearity detection procedure. This technique is useful for cases of local nonlinearity, when its localisation can be of value for the consequent understanding and modelling of the structure. The identification procedure makes use of the Karhunen-Loeve transform, known also as Proper Orthogonal Decomposition (POD). It is a powerful tool for solving inverse problems in nonlinear structural dynamics. The identification procedure works on the basis of the minimisation of a difference function between the experimental and the simulated proper orthogonal modes (POM). The proposed techniques are demonstrated on a beam test case with a local damping type nonlinearity. [less ▲]

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See detailNumerical modelling of the forging process of rolls for rolling mills
Charles, J. F.; Castagne, S.; Zhang, Lihong ULg et al

in Proceedings of the 5ème Congrès national belge, Mecanique théorique et appliquée (2000)

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See detailAssessment of crop based farming systems with a focus on pigeonpea in one selected district in arid and semi-arid lands in the Kenyan coast. Ed. by E. Feoli, D. Pottier, Z. Woldu. Sustainable development of dryland areas of East Africa
Mwang'Ombe, A.W; Olubayo, F; Baudoin, Jean-Pierre ULg et al

in Proceedings of the International Workshop, Addis Ababa, November 9th-12th 1998. European Commission (2000)

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See detailLe dessaisissement et la récusation - La loi du 6 mai 1997 visant à accélérer la procédure devant la Cour de cassation
Jacobs, Ann ULg

in Le point sur les procédures (1ère partie) (2000)

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See detailSuivi de la campagne agricole sahélienne 1998 avec le nouveau senseur basse résolution végétation du satellite spot-4 : analyse comparative avec le senseur NOAA-AVHRR
Tychon, Bernard ULg; Ozer, Pierre ULg; Touré, Souleymane

in Colloque international sur les techniques de l'information spatiale et de l'épidémiologie (2000)

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See detailLa libération conditionnelle et la défense sociale
Jacobs, Ann ULg; Berbuto, Sandra

in Le point sur le droit pénal (2000)

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See detail"'Le répertoire d'une dame de la bonne bourgeoisie de Bruges' (1879): pièces d'identités, traces de mentalités"
Peere, Isabelle ULg

in Constantinescu, Nicolae (Ed.) Balade Si Studiile Despre Balada La Cumpana Dintre Secole. Actele Celei de a 30-a Conferite Internationale de Balada - Comisia de Balade a S.I.E.F (2000)

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See detailLa cartographie « rocambolesque » de Paris et du Buenos Aires arltien
Willson, Patricia ULg

in Crolla, Adriana (Ed.) Temas de literatura francesa. Actas de las XI Jornadas Nacionales de Literatura Francesa (2000)

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See detailA fully coupled elasto-plastic damage model applied to anisotropic materials
Wauters, M.; Habraken, Anne ULg; Duchene, Laurent ULg

in Tassoulas, J. L. (Ed.) Proceedings of the 14th Engineering Mechanics Conference (2000)

In this paper, an elastoplastic energy-based anisotropic damage model for ductile fracture is described. A calibration method is also presented. The potential applicability of this model is illustrated by ... [more ▼]

In this paper, an elastoplastic energy-based anisotropic damage model for ductile fracture is described. A calibration method is also presented. The potential applicability of this model is illustrated by numerical examples of tensile test and Forming Limit Diagram establishment on a steel. [less ▲]

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See detailEffect of energy under- and protein normonutrition in the fattening of Belgian Blue double muscled cull cows
Cremer, Véronique; Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg et al

in Book of abstracts of the 51st Annual Meeting of the European Association for Animal Production (2000)

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See detailEffect of methionine supplementation in the fattening diet of Belgian Blue double muscled cull cows
Cabaraux, Jean-François ULg; Cremer, Véronique; Hornick, Jean-Luc ULg et al

in Book of abstracts of the 51st Annual Meeting of the European Association for Animal Production (2000)

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See detailLong-term evolution of the loading of CH4, N2O, CO, CCl2F2, CHClF2 and SF6 above Central Europe during the last 15 years
Zander, Rodolphe ULg; Mahieu, Emmanuel ULg; Demoulin, Philippe ULg et al

in J. van Ham (Ed.) Non-CO2 greenhouse gases: scientific understanding, control and implementation (2000)

Long-term monitoring activities of some 20 atmospheric constituents are continuing at the International Scientific Station of the Jungfraujoch, Switzerland, based on remote infra-red solar observations ... [more ▼]

Long-term monitoring activities of some 20 atmospheric constituents are continuing at the International Scientific Station of the Jungfraujoch, Switzerland, based on remote infra-red solar observations with high spectral resolution Fourier transform spectrometers. As a contribution to non-CO2 greenhouse gas investigations, we report the trends observed in the vertical column abundances measured regularly since the mid-1980s for CH4, N2O, CO, CCl2F2, CHClF2 and SF6. With the exception of CO, all species show positive rates of change in their near past atmospheric loading, those of CH4, N2O and CCl2F2 having slowed significantly during the more recent years. The derived rates of change will be compared to findings resulting from ground-level in situ investigations at latitudes similar to that of the Jungfraujoch, and be interpreted in terms of resulting global loading changes. [less ▲]

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See detailLa bonne foi procédurale, prévention de l'abus de droit de défense
Georges, Frédéric ULg; de Leval, Georges ULg

in Les perversions du droit de la défense (2000)

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See detailNumerical Simulation of Springback in Sheet Metal Forming
Ponthot, Jean-Philippe ULg; Papeleux, Luc ULg; GOHY, S. et al

in Proceedings of ECCOMAS 2000/COMPLAS VI, European Congress on Computational Methods in Applied Sciences and Engineering (2000)

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See detailNumerical Simulation of Springback in Sheet Metal Forming Using Shell Elements
Papeleux, Luc ULg; GOHY, S.; COLLARD, X. et al

in Proceedings of the Fifth National Belgian Congress on Theoretical and Applied Mechanics (2000)

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See detailBelgian Activities Related to the EUREF Subcommission
Bruyninx, Carine; Dehant, Véronique; Everaerts, Michel ULg et al

in Gubler, E.; Torres, J.; Hornik, H. (Eds.) EUREF Publication (2000)

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See detailLocal buckling of structures in case of fire
Talamona, D.; Franssen, Jean-Marc ULg

in Proceedings of the 4th annual workshop Targeted Research Action - Environmentally Friendly Construction Technologies, ECCREDI (2000)

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See detailSome further results on adaptive lambda-tracking for linear systems with high relative degree
Bullinger, Eric ULg; Findeisen, Rolf; Kraus, Frantisek et al

in Proc. of the 2000 American Control Conf. (2000)

Several adaptive controllers which universally achieve the so-called lambda -tracking have been proposed in the literature. From a practical point of view, previous results are not usable for systems with ... [more ▼]

Several adaptive controllers which universally achieve the so-called lambda -tracking have been proposed in the literature. From a practical point of view, previous results are not usable for systems with a high relative degree because of bad numerical conditioning. The paper presents a modified approach overcoming this numerical problem while achieving the same robust stability properties. Stability and convergence of the adaptation is proven for tracking a large class of reference trajectories. The design of the controller is very simple and intuitive, only few parameters have to be tuned and little structural information about the system to be controlled is needed [less ▲]

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See detailPreventive countermeasures for transient stability-constrained power systems
Ruiz-Vega, Daniel; Ernst, Damien ULg; Pavella, Mania ULg

in Proceedings of the VII Symposium of Specialists in Electric Operational and Expansion Planning (SEPOPE 2000) (2000)

A general transient stability control technique is applied to the design of preventive countermeasures consisting of rescheduling generators’ active power. The technique relies on SIME, a hybrid ... [more ▼]

A general transient stability control technique is applied to the design of preventive countermeasures consisting of rescheduling generators’ active power. The technique relies on SIME, a hybrid direct–time-domain method; and, like SIME, it preserves the accuracy of time-domain methods and their ability to handle any power system modeling, stability scenario and mode of instability. Its application to generation rescheduling may provide various patterns, able to comply with various operational specifics and strategies, as, for example, congestion management or available transfer capability calculations. The paper suggest how the technique may be shaped to choose automatically rescheduling patterns. A sample of such patterns are illustrated via simulations performed on an EPRI test system. [less ▲]

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See detailPhysically based and spatially distributed modeling of floods events: The "Faitou" concept
Dubois, Jérôme; Pirotton, Michel ULg; Schleiss, Anton

in International Symposium on Flood Defence (2000)

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See detailA reliable finite volume scheme for quasi 3D dam-break flood wave propagations
Pirotton, Michel ULg

in Risk Analysis 2000 (2000)

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See detailSome theoretical and modelling aspects of the age as a tool for understanding marine flows
Deleersnijder, E.; Campin, J. M.; Beckers, Jean-Marie ULg et al

in Alonso Del Rosario, J. L.; Gallego, F. O. (Eds.) Actas de la II Jornadas de análisis de variables y simulación numérica del intercambio de masas de agua a través del estrecho de Gibraltar (2000)

The age of a parcel of a constituent of seawater is defined to be the time elapsed since the parcel under consideration left the region where its age is prescribed to be zero. Estimating the age is thus ... [more ▼]

The age of a parcel of a constituent of seawater is defined to be the time elapsed since the parcel under consideration left the region where its age is prescribed to be zero. Estimating the age is thus an invaluable tool for understanding complex oceanic flows and the functioning of the numerical models used for representing them. In this paper, a general theory of the age is presented, in which advection, diffusion, production and destruction are properly accounted for. The partial differential equations used for the rigorous computation of the age as a function of space and time are established. This general theory is applied to the computation of the ventilation rates in the World Ocean. The results are compared with those of widely used carbon-14-like dating techniques. Using both numerical simulations and analytical developments, it is shown that the age of the radioactive tracer is smaller than the carbon-14-like age, which is larger than that of the passive tracer. The latter is equivalent to the ventilation or water age. The difference between the various ages, which is essentially due to the influence of mixing processes, increases as the timescale of decay of the radioactive tracer decreases [less ▲]

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See detailAn original physically based hydrological approach for extreme flood computations on digitalized watersheds
Pirotton, Michel ULg; Dubois, Jérôme; Schleiss, Anton

in Envirosoft 2000 (2000)

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See detailUnified design concept for structural joints in building frames. Application to composite construction.
Jaspart, Jean-Pierre ULg

in Proceedings of the First International Conference on Steel and Composite Structures (2000)

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See detailParameter Identification Using Inverse Problems Methodology in Metal Forming Simulation
KLEINERMANN, J. P.; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in Proc. of the Second International Conference on Engineering Computational Technology “Finite Element Techniques and development (2000)

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See detailOn-line transient stability constrained ATC calculations
Avilas-Rosales, R.; Ruiz-Vega, Daniel; Ernst, Damien ULg et al

in Proceedings of the IEEE Power Engineering Society Summer Meeting 2000 - Volume 2 (2000)

Transient Stability Assessment, preventive control measures and dynamic A X calculations are addressed for the new deregulated EMS system. The combination of time domain analysis, SIME and Optimal Power ... [more ▼]

Transient Stability Assessment, preventive control measures and dynamic A X calculations are addressed for the new deregulated EMS system. The combination of time domain analysis, SIME and Optimal Power Flow provide a reliable solution for future transaction requirements and the current operating point. [less ▲]

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See detailQuality in Web activities through case studies over an integrated platform
Poumay, Marianne ULg; Leclercq, Dieudonné ULg; Demily, Fabian

in Wagner, E. (Ed.) Research and innovation in open and distance learning : proceedings of the first research workshop of EDEN (European Distance Education Network), Prague (2000)

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See detailDamage Model Identification Using Inverse Problem Methodology
KLEINERMANN, J. P.; Ponthot, Jean-Philippe ULg; Stainier, Laurent ULg

in proceedings of Plasticity’2000 (2000)

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See detailCases studies to enhance quality in Web activities
Poumay, Marianne ULg; Leclercq, Dieudonné ULg; Demily, Fabian et al

in Proceedings of WebNet World Conference on the WWW and Internet 2000 (2000)

On-line activities (case studies, peer assessment and distance training) proposed in a course to graduate students are described and evaluated as examples of quality enhancement. The impact on students ... [more ▼]

On-line activities (case studies, peer assessment and distance training) proposed in a course to graduate students are described and evaluated as examples of quality enhancement. The impact on students performances, the level of competencies they develop, the role of tutors and the changing relationship student-tutor-course are highlighted. [less ▲]

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See detailAn algorithm for the fusion of hill shading with satellite maps
Donnay, Jean-Paul ULg; Cornélis, Bernard

in Proceedings of the Third International Conference on Fusion of Earth Data (2000)

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See detailMicrostructure and abrasion resistance of tool steels reinforced by dispersed oxides and carbides phases
Magnée, Adrien ULg; Lecomte-Beckers, Jacqueline ULg

in Revue de Métallurgie- Journées d'Automne de la Société Française de Métallurgie et de Matériaux (2000)

Two ferrous matrix, a high speed steel and a maraging steel were reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy. The particles were mechanically ... [more ▼]

Two ferrous matrix, a high speed steel and a maraging steel were reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy. The particles were mechanically mixed with the prealloyed powder before compaction. To optimize the composite properties, the processing parameters (i.e. prealloyed powders, size, mixing, conditions, temperature of sintering,...) and the effect of reinforcement (size and composition of particles, volume, fraction,...) were studied. It is necessary to obtain full density with minimum porosity and to control the size, distribution and dispersion of the reinforced particles. The optimal sintering temperature depends on the reinforcement particles used and is of great importance for the properties. Processing parameters (mixing of particles) can greatly affect the final properties. The use of AL2O3 was shown to increases wear resistance in the two matrix. [less ▲]

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See detailUse of reference site measurements and remote sensing data to estimate evapotranspiration over the Khan catchment (Ivory Coast)
Terfai, L.; Toure, Souleymane; Tychon, Bernard ULg

in Proceedings of The 2000 Eumetsat meteorological satellite data users' conference (2000)

evapotranspiration experts often need to make decisions relating to the precision of the results of various existing methods such as traditional and satellite methods. For these reasons a decision support ... [more ▼]

evapotranspiration experts often need to make decisions relating to the precision of the results of various existing methods such as traditional and satellite methods. For these reasons a decision support system (EVA) is develped in order to provide evapotranspiration experts with a tool for evaluating the results of a variety of existing methods for estimating potential and real evapotranspiration by using in situ data and remote sensing data. The EVA provides a variety of models that can be used either in combination or as stand-alone tools to generate information for agricultural planning and management. The paper focuses on the concepts of the EVA software. A case study also will be presented. [less ▲]

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See detailDesign of an oceanographic data base
Muller, Fabrice; Donnay, Jean-Paul ULg; De Cauwer, Karien et al

in CoastGIS’99- Geomatics and coastal environment (2000)

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See detailEstablishment of a geographic data dictionnary : case study on the Brussels regional government GIS
Pantazis, Dimos; Cornélis, Bernard; Sheeren, David et al

in Proceedings of the 22nd Urban and Data Management Symposium (2000)

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See detailIntegration of 3D information in Urban GIS :a conceptual view
Billen, Roland ULg

in Proceedings of the ISPRS 2000 (2000)

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See detailComparison of vegetation distributions and terrestrial carbon budgets reconstructed for the last glacial maximum with several biosphere models
François, Louis ULg; Kaplan, J.; Otto, D. et al

in Braconnot, P. (Ed.) PMIP, 2000: Paleoclimate Modelling Intercomparison Project (PMIP), Proceedings of the Third PMIP workshop (2000)

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See detailDistribution of the foraging activity of females Antarctic fur seal (Actocephalus Gazella)
Dubroca, Laurent; Guinet, Christophe; Lea, Mary-Anne et al

in Oceanographic factors and prey distribution at Kerguelen island : a two-year comparison (2000)

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See detailUse of medium-resolution imagery in the Belgian crop growth monitoring system (B-CGMS).
Eerens, Herman; Wouters, Katy; Dehem, Didier et al

in Saint, Gilbert (Ed.) Proceedings of Vegetation 2000 : 2 years of operation to prepare the future, Lake Maggiore - Italy - 3-6 April 2000 (2000)

The Belgian Crop Growth Monitoring System (B-CGMS) uses the 1km²-resolution imagery of NOAA-AVHRR and SPOT-VEGETATION to improve its yield estimates. The pre-processed images are converted to fAPAR and ... [more ▼]

The Belgian Crop Growth Monitoring System (B-CGMS) uses the 1km²-resolution imagery of NOAA-AVHRR and SPOT-VEGETATION to improve its yield estimates. The pre-processed images are converted to fAPAR and combined with meteorological data (irradiance, temperature) to daily growth values by means of the Monteith approach. The regional means of the cumulative monthly growth numbers are calibrated against official harvest statistics by means of crop-specific neural networks. The quality of the yield estimates varies with the importance of the crop: the R²-values for winter wheat, sugar-beets and fodder maize are respectively 60%, 48% and 36%. The final yield forecasts will be better, because the B-CGMS integrates the image-based yield estimates with the assessments of the agromet-model and of the technological trend function. The technique of linear unmixing seems promising but in its actual state it is too unpredictable to be included in an operational scheme. [less ▲]

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See detailApplication of reinforcement learning to electrical power system closed-loop emergency control
Druet, Christophe; Ernst, Damien ULg; Wehenkel, Louis ULg

in Principles of Data Mining and Knowledge Discovery, 4th European Conference, PKDD 2000 (2000)

This paper investigates the use of reinforcement learning in electric power system emergency control. The approach consists of using numerical simulations together with on-policy Monte Carlo control to ... [more ▼]

This paper investigates the use of reinforcement learning in electric power system emergency control. The approach consists of using numerical simulations together with on-policy Monte Carlo control to determine a discrete switching control law to trip generators so as to avoid loss of synchronism. The proposed approach is tested on a model of a real large scale power system and results are compared with a quasi-optimal control law designed by a brute force approach for this system. [less ▲]

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See detailImpact of crops on biomass and soil carbon: steady state simulations
Nemry, B.; François, Louis ULg; Gérard, Jean-Claude ULg et al

in Cramer, W.; Doherty, R.; Hulme, M. (Eds.) et al Climate Scenarios for Agricultural, Forest and Ecosystem Impacts (2000)

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See detailThe role of continental weathering in controlling atmospheric CO2 levels at glacial-interglacial time scales
Munhoven, Guy ULg

in Explaining Glacial/Interglacial CO2 changes (2000)

The potential role of silicate weathering changes for explaining glacial-interglacial variations of CO2 in the atmosphere is discussed. Various methods for reconstructing the evolution of silicate ... [more ▼]

The potential role of silicate weathering changes for explaining glacial-interglacial variations of CO2 in the atmosphere is discussed. Various methods for reconstructing the evolution of silicate weathering rates on glacial-interglacial time scales are presented. An extensive list of key references and reading materials is provided. [less ▲]

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See detailEnhancing mineral segmentation in optical microscopy with multispectral imaging
Pirard, Eric ULg; De Colnet, Laurence

in Proceedings 8th European Congress for Stereology (2000)

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See detailMoving from colour to multispectral digital imaging in optical microscopy
Pirard, Eric ULg; De Colnet, Laurence

in NvvM Jaarboek (2000)

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See detailEstimateurs Robustes pour les Composantes Principales
Croux, Christophe ULg; Haesbroeck, Gentiane ULg

in Proceedings des XXXII Journées de Statistique (2000)

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See detailPolish – Belgian co-operation. Development of an educational photogrammetric software
Ewiak, Irek; Billen, Roland ULg; Cornélis, Bernard et al

in Proceedings of the ISPRS 2000 (2000)

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See detailAdaptive lambda-tracking in anesthesia
Bullinger, Eric ULg; Frei, C. W.; Sieber, T. et al

(2000)

We present an adaptive controller for tracking reference signals of end-tidal concentration of anesthetic gas for automatic control in anesthesia. The adaptation scheme does not use any identification ... [more ▼]

We present an adaptive controller for tracking reference signals of end-tidal concentration of anesthetic gas for automatic control in anesthesia. The adaptation scheme does not use any identification mechanism. Since only structural information on the system to be controlled is needed for the controller design, the controller is very robust to changes in the parameters of the system [less ▲]

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See detailSelf-consistent approximations: application to a quasiparticle description of the thermodynamic properties of relativistic plasmas
Vanderheyden, Benoît ULg; Baym, Gordon

in Michael, Bonitz (Ed.) PROGRESS IN NONEQUILIBRIUM GREEN'S FUNCTIONS (2000)

We generalize the concept of conserving, Phi-derivable, approximations to relativistic field theories. Treating the interaction field as a dynamical degree of freedom, we derive the thermodynamical ... [more ▼]

We generalize the concept of conserving, Phi-derivable, approximations to relativistic field theories. Treating the interaction field as a dynamical degree of freedom, we derive the thermodynamical potential in terms of fully dressed propagators, an approach which allows us to resolve the entropy of a relativistic plasma into contributions from its interacting elementary excitations. We illustrate the derivation for a hot QED plasma of massless particles. We also discuss how the self-consistency of the treatment manifests itself into relationships between the contributions from interaction and matter fields. [less ▲]

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See detailPreventive and emergency transient stability control
Ernst, Damien ULg; Ruiz-Vega, Daniel; Pavella, Mania ULg

in Proceedings of the VII Symposium of Specialists in Electric Operational and Expansion Planning (SEPOPE 2000) (2000)

A unified approach to transient stability closed-loop control is presented. It relies on the general transient stability method called SIME, from which the Preventive and the Emergency SIMEs are derived ... [more ▼]

A unified approach to transient stability closed-loop control is presented. It relies on the general transient stability method called SIME, from which the Preventive and the Emergency SIMEs are derived. The Preventive SIME uses time-domain simulations of plausible contingencies prior to their occurrence, for the online power system monitoring from the control room. The Emergency SIME, on the other hand, uses real-time measurements, acquired on the system power plants after the actual occurrence of a contingency in order to appraise and trigger countermeasures indispensable for the system integrity. Despite fundamental differences in their design and objectives, the two approaches have also common features. This paper highlights main differences and similarities, and illustrates them on a realistic, large power system. The tradeoff between on-line preventive control and real-time emergency control is also assessed in terms of size of the involved countermeasures. [less ▲]

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See detailThermo-mechanical model of a strand in the mould of a continuous casting plant
Pascon, Frédéric ULg; Habraken, Anne ULg; Bourdouxhe, Michel et al

in Proceedings of the European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2000) (2000)

Surface and internal quality of continuous casts depends very much on the behaviour of the strand in the mould. Among the parameters likely to influence this behaviour, the mould taper takes a prominen ... [more ▼]

Surface and internal quality of continuous casts depends very much on the behaviour of the strand in the mould. Among the parameters likely to influence this behaviour, the mould taper takes a prominen tpart. In order to understand better the influence of this parameter, we build up a thermal-mechanical finite element model. A slice of the strand is modelled and its evolution is observed. The main results are temperature field and solidification evolution, stree, strain and strain rate fields and losses of contact and returns to contact analysis. The model includes an elastic-viscous-plastic law, to describe the behaviour of steel from liquid to solid state, a thermal-mechanical element that takes into account thermal expansion and mechanical behaviour of the strand, a unilateral contact element, z mobile rigid boundary element to model the mould and its taper and an adapted loading element to model the ferrostatic pressure according to the liquid or solid state. This paper presents the first results obtained with an relatively simple section ( a125 mm square billet). Now the model is used with more complex section (beam blanks) and its validation is going on. [less ▲]

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See detailFrom health needs assessment to ergonomics actions. How to intitiate a participatory change process ?
Mairiaux, Philippe ULg; Müller, Michel; Vandoorne, Chantal ULg

(2000)

A health promotion process has been launched within a large Belgian university hospital. This presentation outlines the organisational background of the whole process and the rationale underlining the ... [more ▼]

A health promotion process has been launched within a large Belgian university hospital. This presentation outlines the organisational background of the whole process and the rationale underlining the choice of the methodologies used to survey the health needs of the health care workers and to define priorities. In order to elicit effective participation from the staff members, several questions have to be addressed in the transitional phase between problem situations assessment and ergonomic intervention : which channels use to disseminate the information about the survey results, what role for the top rnanagernent of the hospital and for the ergonomic experts, which support methodologies should be provided for initiating the change process? [less ▲]

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See detailLes attentes des consommateurs, des nouveaux critères de sélection porcine
Leroy, Pascal ULg; Beduin, Jean-Marie; Verleyen, Vincent ULg et al

in Sixième Carrefour des productions animales "La sélection animale au service de la Société" (2000)

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See detailEnseignement, entreprise et écriture : l'interaction est-elle possible ?
Crahay, Marcel ULg; Schockert, C.; Vanhulle, S.

in La rédaction technique : actes du séminaire de Bruxelles des 24 et 25 novembre 1997 (2000)

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See detailThermomechanical model of the behaviour of a strand in continuous steel casting using finite element method
Pascon, Frédéric ULg; Habraken, Anne ULg; Bourdouxhe, Michel et al

in Proceedings of the 5ème Congrès national belge, Mécanique théorique et appliquée (2000)

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See detailDeux formulations duales pour la prise en compte d'écrans électromagnétiques de topologies complexes
Geuzaine, Christophe ULg; Dular, Patrick ULg; Legros, Willy ULg

in Proceedings of NUMELEC 2000, 3ème Conférence Européenne sur les Méthodes Numériques en Électromagnétisme (2000)

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See detailGranulés ou farine en post-sevrage : le choix des porcelets
Laitat, Martine ULg; Vandenheede, Marc ULg; Desiron, Alain et al

in 32èmes Journées de la Recherche Porcine en France (2000)

During 47 days, 80 weaned pigs, allotted to 2 groups of 30 and 50 animals, were given choice simultaneously between pellets or meal distributed ad libitum in feeders equipped with an integrated watering ... [more ▼]

During 47 days, 80 weaned pigs, allotted to 2 groups of 30 and 50 animals, were given choice simultaneously between pellets or meal distributed ad libitum in feeders equipped with an integrated watering system. The average daily weight gain was 0.4250.058 kg, without significant difference between groups, and the mean feed conversion ratio was 1.72. The mean feed intake with pellets was double that with meal (0.49 vs. 0.24 kg/head daily). However, the pellet feeders and meal feeders were occupied for the same proportion of time: the mean occupation times were 45.5 and 42.8% (30 pigs) and 62.4 and 67.3% (50 pigs), respectively. Eating pellets seems thus to take less time than eating meal. Furthermore, we have observed that animals from the larger group were eating more quickly than members of the smaller one. Even if the feed intake of pigs with pellets was twice that with meal, pigs drank more water (60% of the total water intake) using the meal feeder. Thus, with pellets, pigs don't seem to choose a close association between feed and water consumption. In conclusion, pigs prefer pellets to meal, this choice being probably partially explained by a faster ingestion. This eating speed depending also on the group size, the number of eating places should thus take into account these two parameters. [less ▲]

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See detailTemporal machine learning for switching control
Geurts, Pierre ULg; Wehenkel, Louis ULg

in Proceedings of PKDD 2000, 4th European Conference on Principles of Data Mining and Knowledge Discovery (2000)

In this paper, a temporal machine learning method is presented which is able to automatically construct rules allowing to detect as soon as possible an event using past and present measurements made on a ... [more ▼]

In this paper, a temporal machine learning method is presented which is able to automatically construct rules allowing to detect as soon as possible an event using past and present measurements made on a complex system. This method can take as inputs dynamic scenarios directly described by temporal variables and provides easily readable results in the form of detection trees. The application of this method is discussed in the context of switching control. Switching (or discrete event) control of continuous systems consists in changing the structure of a system in such a way as to contreol its behavior. Given a particular discrete control switch, detection trees are applied to the induction of rules which decide based on the available measurements whether or not to operate a switch. Two practical applications are discussed in the context of electrical power systems emergency control. [less ▲]

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See detailMagneto-thermal coupling simulations -- Application to the SSM processing of steels
Rassili, A.; Geuzaine, Christophe ULg; Dular, Patrick ULg et al

in Proceedings of the 5th International Workshop on Electric and Magnetic Fields, EMF 2000 (2000)

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See detailVEGETATION potentialities in food early warning systems in the Sahelian region.
Tychon, Bernard ULg; Ozer, Pierre ULg; Touré, Souleymane

in SAINT, Gilbert (Ed.) VEGETATION 2000 - 2 years of operation to prepare the future (2000)

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See detailSome enhancements of decision tree bagging
Geurts, Pierre ULg

in Proceedings of PKDD 2000, 4th European Conference on Principles of Data Mining and Knowledge Discovery (2000)

This paper investigates enhancements of decision tree bagging which mainly aims at improving computation times, but also accuracy. The three questions which are reconsidered are: discretization of ... [more ▼]

This paper investigates enhancements of decision tree bagging which mainly aims at improving computation times, but also accuracy. The three questions which are reconsidered are: discretization of continuous attributes, tree pruning, and sampling schemes. A very simple discretization procedure is proposed, resulting in a dramatic speedup without significant decrease in accuracy. Then a new method is proposed to prune an ensemble of trees in a combined fashion, which is significantly more effective than individual pruning. Finally, different resampling schemes are considered leading to different CPU time/accuracy tradeoffs. Combining all these enhancements makes it possible to apply tree bagging to very large datasets, with computational performances similar to single tree induction. Simulations are carried out on two synthetic databases and four real-life datasets. [less ▲]

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See detailInvestigation and reduction of discretization Variance in decision tree induction
Geurts, Pierre ULg; Wehenkel, Louis ULg

in Proceedings of ECML 2000, European Conference on Machine Learning (2000)

This paper focuses on the variance introduced by the discretization techniques used to handle continuous attributes in decision tree induction. Different discretization procedures are first studied ... [more ▼]

This paper focuses on the variance introduced by the discretization techniques used to handle continuous attributes in decision tree induction. Different discretization procedures are first studied empirically, then means to reduce the discretization variance are proposed. The experiments shows that discretization variance is large and that it is possible to reduce it significantly without notable computational costs. The resulting variance reduction mainly improves interpretability and stability of decision trees, and marginally their accuracy. [less ▲]

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See detailGalerkin and de Rham Discretizations for Hybrid Methods
Geuzaine, Christophe ULg; Tarhasaari, T.; Kettunen, L. et al

in Proceedings of the 9th IEEE Conference on Electromagnetic Field Computation (CEFC'2000) (2000)

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See detailPrésentation des Travaux de la section "Histoire de la linguistique"
Droixhe, Daniel ULg; Hassler, G.

in Englebert, A.; Pierrard, M.; Rosier, L. (Eds.) et al Actes du XXIIe Congrès International de Linguistique et Philologie Romanes : Volume I. L’histoire de la linguistique, médiatrice de théories (2000)

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See detailNumerical study of coupling between optical fibers
Guenneau, S.; Nicolet, A.; Zolla, F. et al

in Proceedings of the 5th International Workshop on Electric and Magnetic Fields, EMF 2000 (2000)

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See detailSimulation of adequate inductive heating parameters and the magneto-thermal coupling involved in the SSM processing of steels
Rassili, A.; Geuzaine, Christophe ULg; Legros, Willy ULg et al

in Proceedings of the 6th International Conference on Semi-Solid Processing of Alloys and Composites, SSM 2000 (2000)

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See detailEcobilan azoté et émission de vapeur d'eau lors d'élevage de porcelets sevrés sur litière accumulée de sciure
Nicks, Baudouin ULg; Vandenheede, Marc ULg; Desiron, Alain et al

in compte rendu du cinquième carrefour des productions animales "quels systèmes de productions animales pour le 21è siècle?" (2000)

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See detailConnection boundary conditions with different types of finite elements applied to periodicity conditions and to the moving band
Dular, Patrick ULg; Geuzaine, Christophe ULg; Ferreira da Luz, M. V. et al

in Proceedings of the 5th International Workshop on Electric and Magnetic Fields, EMF 2000 (2000)

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See detailMaintenance and modernization works in the Belgian waterways network
Lejeune, André ULg; Pirotton, Michel ULg

in Internationales Wasserbausymposium Aachen 2000: Verkehrswasserbau (2000)

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See detailModeling the impact of macroscale and mesoscale hydrodynamics on the space-time distribution of the Black sea’s plankton bloom annual cycle. Comparison of model results with CZCS observations
Grégoire, Marilaure ULg; Nihoul, J.

in Robinson, A.; Lermusiaux, P. (Eds.) Assimilation of biological data in coupled Physical/Ecosystem models (2000)

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See detailLes conditions de rentabilité des trousses de diagnostic moléculaire dans le domaine de la certification phytosanitaire
Chandelier, Anne; Cognet, Stéphane; Kummert, Jean et al

in AFPP (2000)

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See detailJeunes sans emploi: professiion chômeur
Robert, Jocelyne ULg

in Lemaire, Jacques; Susanne, Charles (Eds.) Avoir vingt ans en l'an 2000, pour quoi faire? (2000)

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See detailTests on the strain rate effects on beam-to-column steel connections
Plumier, André ULg; Sanchez, L.

in Mazzolani, F.; Tremblay, R. (Eds.) Proceedings of the STESSA 2000 Conferences "Bahaviour of steel structures in seismic areas" (2000)

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See detailMapping QTL influencing muscularity in a Texel x Romanov intercross
Marcq, Fabienne ULg; Elsen, J.-M.; Marot, V. et al

(2000)

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See detailFragmentation assessment using a single value: proposal of a new measure.
Bogaert, Jan ULg; Ceulemans, R; Van Hecke, P

in Symposium on biodiversity: from genes to landscapes. (2000)

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See detailLateral Torsional Buckling of Steel I-Beams in Case of Fire - Numerical Modeling
Vila Real, P. M. M.; Franssen, Jean-Marc ULg

in Proceedings of the 1st International Structures in Fire Workshop (2000)

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See detailObjective assessment of subjectivity : applying confidence marking to partial knowledge
Leclercq, Dieudonné ULg; Jans, V.; Georges, François ULg et al

in Conference held by the EARLI SIG on Assessment, Maastricht, September 2000 (2000)

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See detailModélisation déterministe des écoulements et du transport de contaminants pour la détermination des zones de protection en Belgique
Dassargues, Alain ULg; Hallet, Vincent

in Milieux poreux et transferts hydriques - Bulletin du Groupe Francophone Humidimétrie et Transferts en Milieux Poreux, Strasbourg (2000)

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See detailInfluence de la jurisprudence de la Cour européenne des droits de l'homme sur la jurisprudence belge en matière de perquisistions
Jacobs, Ann ULg

in Tendances de la jurisprudence en matière pénale (2000)

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See detailLa prescription
Jacobs, Ann ULg

in Actualités de droit pénal (1ère partie) (2000)

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See detailModelization, Development and Testing of a Variable Geometry Nozzle
Mignon, Anthony; Léonard, Olivier ULg

in Proceedings of the 5th Belgian National Congress on Theoretical and Applied Mechanics (2000)

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See detailLa saisie-arrêt bancaire dans l'Union Européenne
Georges, Frédéric ULg; de Leval, Georges ULg

in L'efficacité de la justice civile en Europe (2000)

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See detailL’isocinétisme au service du footballeur blessé
Crielaard, Jean-Michel ULg; Croisier, Jean-Louis ULg

in Actes du Colloque Médical : « Foot 2000 : entraînement optimal, risque minimal » (2000)

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See detailStrong decays of the scalar glueball in a confining effective Lagrangian of QCD
Jaminon, Martine ULg; Mathot, Michel ULg; Van den Bossche

in Blin, A. H.; Hiller, B.; Ruivo, M. C. (Eds.) et al Hadron Physics: Effective Theories of Low Energy QCD N°1 (2000)

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See detailBrief review of some modified versions of tje NJL model
Jaminon, Martine ULg

in Hiller, B.; Ruivo, M. C.; de Sousa, C. A. (Eds.) et al Hadron Physics: effective theories of low Energy QCD n°1 (2000)

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See detailLaryngeal paralysis-polyneuropathy complex in a litter of Pyrenean Mountain dogs.
Peeters, Dominique ULg; Clercx, Cécile ULg; Vanham, Luc et al

in Proceedings of the 10th Annual Congress of the ESVIM (2000)

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See detailNumerical modelling of the forging process of rolls for rolling mills
Charles, J.-F.; Castagne, Sylvie; Zhang, Lihong ULg et al

in Pietrzyk, M.; Kusiak, J.; Majta, J. (Eds.) et al Proceedings of the 8th International Conference on Metal Forming (2000)

This article presents comparisons of forging processes between two flat tools, between two round tools, and at different forging temperatures. Simulation results help to recover and better understa,d long ... [more ▼]

This article presents comparisons of forging processes between two flat tools, between two round tools, and at different forging temperatures. Simulation results help to recover and better understa,d long practice in the forging industry. [less ▲]

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See detailMetal Forming Processes Optimization Using Inverse Problems
KLEINERMANN, J. P.; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in Proceedings of ECCOMAS 2000/COMPLAS VI, European Congress on Computational Methods in Applied Sciences and Engineering (2000)

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See detailVérification de la validité du test kinésiologique de Meerseman par des mesures isocinétiques
Fernandez-Moreno, S.; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg et al

in Actes du XIIIème Colloque de l’association Internationale Francophone de Recherche Odontologique (2000)

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See detailNumerical Simulation of Springback in Sheet Metal Forming Using Linear Shell Elements
Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg; GOHY, S. et al

in Proceedings of IASS-IACM 2000, Fourth International Colloquium on Computation of Shell and Spatial Structure (2000)

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See detailMagie et imprécations dans les mythes grecs : le cas d'Althaia
Renaud, Jean-Michel ULg

in Moreau, Alain; Turpin, Jean-Claude (Eds.) La Magie dans l'antiquité grecque tardive. Les mythes. Actes du Colloque International de Montpellier. 25-27 mars 1999, 4 volumes (2000)

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See detailDesigning structural joints according to Eurocodes
Jaspart, Jean-Pierre ULg

in Proceedings of the "NATO Advanced Research Workshop on the Paramount Role of Joints into the Reliable Response of Structures" (2000)

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