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See detailBoltanski's moral sociology and his implicit theory of ideology
Jacquemain, Marc ULg

Conference (2008, May)

The paper exposes the main lines of sociology of action regimes and of justification of Boltanski. It also shows how his concept of "test" is very well suited to a non deterministic sociology, a sociology ... [more ▼]

The paper exposes the main lines of sociology of action regimes and of justification of Boltanski. It also shows how his concept of "test" is very well suited to a non deterministic sociology, a sociology of contingency [less ▲]

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See detailBackward Euler method for single time step finite element simulation of the magnetization of high-temperature bulk superconductors with non linear conductivity
Lousberg, Grégory ULg

Conference (2008, May)

We consider a three dimensional (3D) finite element modeling of high temperature superconductors (HTS) submitted to a uniform magnetic field varying linearly with time. HTS are characterized by a non ... [more ▼]

We consider a three dimensional (3D) finite element modeling of high temperature superconductors (HTS) submitted to a uniform magnetic field varying linearly with time. HTS are characterized by a non linear conductivity described by a power law with the critical exponent, n. We implement an A- phi weak formulation into the opensource solver GetDP. Backward Euler method is used for the temporal resolution and is coupled to a non linear Picard iteration scheme for dealing with the non linear resistivity of HTS.We consider single- and multiple-time step methods and show that the single time step method produces an accurate result in a drastically reduced calculation time for HTS with large pinning strength (or similarly, with large values of n). The finite element formulation is validated by comparing the magnetization of a HTS tube calculated either with our finite element formulation or with other well-known techniques. The numerical method is then applied for comparing the magnetization of cylinders that are drilled by different periodic arrangements of columnar holes parallel to the cylinder axis. [less ▲]

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See detailPrediction of genetic risk of complex diseases by supervised learning
Botta, Vincent ULg; Geurts, Pierre ULg; Hansoul, Sarah et al

Scientific conference (2008, May)

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See detailIonospheric slab thickness: analysis and monitoring applications
Stankov, Stanimir; Warnant, René ULg

in Proceedings of the 12th International Ionospheric Effects Symposium (IES2008) (2008, May)

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See detailEfficacy of Erlotinib in patients (PTS) with advanced non-small-cell lung cancer (NSCLC) relative to clinical charesteristics : subset analyses from the trust study
Allan, S.; BOSQUEE, Léon ULg; Franke, A. et al

in American Journal of Clinical Oncology (2008), 26(20),

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See detailMoins d’antibiotiques, moins de résistances
Belche, Jean ULg; Chevalier, Pierre

in Minerva: Tijdschrift Voor Evidence Based Medicine (2008), 7(5), 68-69

Analyse de Butler CC, Dunstan F, Heginbothom M, et al. Containing antibiotic resistance: decreased antibiotic-resistant coliform urinary tract infections with reduction in antibiotic prescribing by ... [more ▼]

Analyse de Butler CC, Dunstan F, Heginbothom M, et al. Containing antibiotic resistance: decreased antibiotic-resistant coliform urinary tract infections with reduction in antibiotic prescribing by general practices. Brit J Gen Pract 2007;57:785-92. [less ▲]

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See detailLa "directive retour" et le respect des droits fondamentaux
Carlier, Jean-Yves ULg

in L'Europe des libertés (2008), (26), 13-21

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See detailMulti-Criteria Selection of Hydraulic Gates
Daniel, R.; Dembick, E.; Rigo, Philippe ULg

in International Navigation Seminar, PIANC AGA2008, Beijing, China Communication Press (CIP), Beijing, China, May 2008 (2008, May)

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See detailLe design du système de contrôle de gestion des PME : une quête de stabilité adaptative
Van Caillie, Didier ULg; Santin, Sarah; Rouhana, Rima ULg

in Actes du XXIIIème Congrès de l'Association Francophone de Comptabilité (2008, May)

This paper discusses the characteristics of management control systems in SMEs and insists on their ability to monitor change and performance in high turbulent environment

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See detailImpact du recours à une table de spécification sur la construction de test à choix multiples appliqué à la pathologie de la reproduction en médecine vétérinaire.
Hanzen, Christian ULg; Theron, Léonard ULg; Sterkendries, José et al

in Les Actes du 25ème congrès. Montpellier 19-22 mai 2008 (2008, May)

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See detailOptiView − A Powerful and Flexible Decision Tool Optimising Space Allocation in Shipyard Workshops
Caprace, Jean-David ULg; Bair, Frédéric ULg; Losseau, Nicolas ULg et al

in Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT) (2008, May)

This paper presents new developments to maximize the number of ship blocks and ship sections produced in various workshops of shipyards during a certain time window. The visualization tool OptiView® was ... [more ▼]

This paper presents new developments to maximize the number of ship blocks and ship sections produced in various workshops of shipyards during a certain time window. The visualization tool OptiView® was developed to support users to improve the space utilization and workshop productivity. The software is coupled with a heuristic optimisation solver. The paper describes the approach to the space allocation problem and gives three application examples. [less ▲]

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See detailIntermediate integer programming representations using value disjunctions
Köppe, Matthias; Louveaux, Quentin ULg; Weismantel, Robert

in Discrete Optimization (2008), 5(2), 293-313

We introduce a general technique to create an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. The ... [more ▼]

We introduce a general technique to create an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. The extended formu- lation is constructed by creating a new binary variable for each generated value. Initial experiments show that the extended formulation can have a more compact complete description than the original formulation. We prove that, using this reformulation technique, the facet descrip- tion decomposes into one “linking polyhedron” per block and the “aggre- gated polyhedron”. Each of these polyhedra can be analyzed separately. For the case of identical coefficients in a block, we provide a complete description of the linking polyhedron and a polynomial-time separation algorithm. Applied to the knapsack with a fixed number of distinct coeffi- cients, this theorem provides a complete description in an extended space with a polynomial number of variables. Based on this theory, we propose a new branching scheme that analyzes the problem structure. It is designed to be applied in those subproblems of hard integer programs where LP-based techniques do not provide good branching decisions. Preliminary computational experiments show that it is successful for some benchmark problems of multi-knapsack type. [less ▲]

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See detailPolyhedral properties for the intersection of two knapsacks
Louveaux, Quentin ULg; Weismantel, Robert

in Mathematical Programming (2008), 113(1), 15-37

We address the question to what extent polyhedral knowledge about individual knapsack constraints suffices or lacks to describe the convex hull of the binary solutions to their intersection. It turns out ... [more ▼]

We address the question to what extent polyhedral knowledge about individual knapsack constraints suffices or lacks to describe the convex hull of the binary solutions to their intersection. It turns out that the sign patterns of the weight vectors are responsible for the types of combinatorial valid inequalities appearing in the description of the convex hull of the intersection. In partic- ular, we introduce the notion of an incomplete set inequality which is based on a combinatorial principle for the intersection of two knapsacks. We outline schemes to compute nontrivial bounds for the strength of such inequalities w.r.t. the intersection of the convex hulls of the initial knapsacks. An extension of the inequalities to the mixed case is also given. This opens up the possibility to use the inequalities in an arbitrary simplex tableau. [less ▲]

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See detailRéguler les enseignements dans une approche qualité l'apport diagnostic du modèle du polygone des paramètres des actions didactiques
Gilles, Jean-Luc ULg; Bosmans, Catherine ULg; Mainferme, Renaud ULg

in 25ème Congrès de l'Association Internationale de Pédagogie Universitaire (AIPU) - "Le défi de la qualité dans l'enseignement supérieur : vers un changement de paradigme" (2008, May)

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See detailGérer et contrôler la qualité des évaluations standardisées à l'aide de la plateforme open source ExAMS
Gilles, Jean-Luc ULg; Detroz, Pascal ULg

in 25ème Congrès de l'Association Internationale de Pédagogie Universitaire (AIPU) - "Le défi de la qualité dans l'enseignement supérieur : vers un changement de paradigme" (2008, May)

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See detailArchitecture of a Grid-Enabled Lattice-Boltzmann Middleware
Dethier, Gérard ULg; Marchot, Pierre ULg; de Marneffe, Pierre-Arnoul ULg

Poster (2008, May)

Lattice-Boltzmann (LB) simulation methods constitute a family of computational fluid dynamics methods that can deal with complex multiphysics models and are easily parallelizable. They are based on ... [more ▼]

Lattice-Boltzmann (LB) simulation methods constitute a family of computational fluid dynamics methods that can deal with complex multiphysics models and are easily parallelizable. They are based on modified lattice-gas automata. The algorithm of LB simulations is quite simple. Space is discretized into a lattice. Each node of this lattice has a state. This state indicates the proportion of particules moving along fixed directions (these proportions are generally called “fields”). At each time step, the state of all lattice nodes is updated. Each node first receives fields coming from its neighbors and then “collides” them by applying a collision operator which generates the new state. Grid computing can be defined as “coordinated resource sharing and problem solving in dynamic, multi-institutional collaborations”. In practice, a Grid user (which can be a software component) submits a job composed of tasks to the Grid. The tasks are automatically run on available computational resources across organizational boundaries (i.e. clusters of multiple departments). LaBoGrid is an application combining the concepts of LB modelling and Grid computing. It is able to run LB simulations on an arbitrary number of computational resources from a Grid. It deals with operating system and hardware performance heterogeneity. The former because LaBoGrid is written in Java. The latter thanks to load-balancing. This is essential because all LaBoGrid tasks are inter- connected and depend on information from one another. A slow LaBoGrid task will slow down the overall process. LaBoGrid is based on asynchronous agents exchanging messages. The two main agents are the Controller agent (CA) and the distributed agent (DA). In a deployed LaBoGrid system, the CA exists in only one instance. It keeps track of the DAs and their topology. A task agent running some arbitrary code can be attached to the CA (CAT) and the DAs (DAT). In LaBoGrid, LB-specialized task agents are used (this system could be adapted to other problems). A configuration file parsed by the LB CAT gives the parameters of an LB simulation. The LB CAT configures automatically the LB DATs which handle the simulation code. Currently, LB simulations are done on 3D fluids with 19 fields per state. However, the code can be adapted very easily to other fluid dimensions and different state definitions, storage and computation precisions and collision types. [less ▲]

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