Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailFuture Talks, Compte-rendu du colloque organisé par Die Neue Sammlung, The International Design Museum, les 22 et 23 octobre 2009 à Munich
Defeyt, Catherine ULg

in CeROArt : Conservation, Exposition, Restauration d'Objets d'Art (2010)

Detailed reference viewed: 2 (0 ULg)
Peer Reviewed
See detailFuture thinking and the self
D'Argembeau, Arnaud ULg

Conference (2011, August 04)

Detailed reference viewed: 39 (4 ULg)
Peer Reviewed
See detailFuture trends in the management of airway inflammatory disorders
Lekeux, Pierre ULg; Bureau, Fabrice ULg

in Proceedings: 6th Congress of the World Equine Veterinary Association (1999)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailFuturs antérieurs et précédents uchroniques: l'anti-utopie comme conjuration de la menace
Claisse, Frédéric ULg

in Temporalités : Productions, Usages, Figures : Revue de Sciences Sociales et Humaines (2010), (12),

Traditionally regarded as a mere critical inversion of utopia, dystopia will be characterized here as an instance of a more general critical posture, through the concepts of ‘future perfect’ and ... [more ▼]

Traditionally regarded as a mere critical inversion of utopia, dystopia will be characterized here as an instance of a more general critical posture, through the concepts of ‘future perfect’ and ‘counterfactual precedent’. The future perfect belongs to, but differs from the logics of alert in its temporal modalities and use of fiction: the dystopian future is described as having already happened in the actuality of the narrative present, in a paradoxical gesture which aims to conjure up the threat in the recipient’s representational space only to thwart it. The cases examined are taken from the issue of new technologies of surveillance and social control, which challenged stakeholders to update their critical reference points and anticipation skills over the last twenty years. An analysis in terms of the future perfect enables us to understand the swing of configurations: Big Brother is now downgraded as a ‘counterfactual precedent’ compared to the new threats posed by ‘societies of control’. In addition, the similar way these fictional patterns and figures operate points to a cognitive (the articulation between the real and the possible worlds accessed by anticipation) as well as a pragmatic dimension (empowering the political community to envision a new future). By the end of the analysis, fiction appears as both a mode of knowledge and a handle on the world. [less ▲]

Detailed reference viewed: 53 (11 ULg)
Peer Reviewed
See detailLes futurs enseignants se sentent-ils une responsabilité vis-à-vis de l'échec scolaire ?
Beckers, Jacqueline ULg

in Education et Recherche (1995), 17(3),

Detailed reference viewed: 11 (1 ULg)
See detailFUV Global View of the Evolution of Electrons and Protons Substorms
Meurant, M.; Hubert, Benoît ULg; Gérard, Jean-Claude ULg et al

Conference (2002, May 01)

The FUV instruments on board the IMAGE satellite provide global images of the N2-LBH (WIC), OI-1356 Ì· (SI13) and Doppler shifted Lyman-alpha (SI12) emissions of the north polar aurora. The 7 Re apogee of ... [more ▼]

The FUV instruments on board the IMAGE satellite provide global images of the N2-LBH (WIC), OI-1356 Ì· (SI13) and Doppler shifted Lyman-alpha (SI12) emissions of the north polar aurora. The 7 Re apogee of the IMAGE orbit allows FUV to simultaneously image the entire auroral zone during a large fraction of the orbit. We present a result of a study of the global morphology evolution during substorm development and recovery. In order to avoid any dayglow contamination, this study is restricted to winter observation. In active regions, electron fluxes and electrons mean energies are deduced assuming a Maxwellian distribution assumption. The mean energy is derived from the WIC/SI13 ratio. Proton fluxes are also determined assuming a 8 keV proton mean energy with a Kappa distribution. The temporal dependence of the electron and proton injections is studied along with their magnetic local time and magnetic latitude variations during several substorms. In particular, the temporal evolution of the magnetic latitude of the bulk proton and electron injections is presented. Our results are found to be consistent with previous studies resting on ground based observations. [less ▲]

Detailed reference viewed: 15 (1 ULg)
See detailFUV remote sensing of the isotropic boundary and magnetotail stretching
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Meurant, M. et al

Conference (2004, December 01)

Several studies attempted to identify the Isotropic Boundary (IB) defining the limit between the adiabatic and non-adiabatic trajectories of the trapped protons along closed magnetic field lines. This ... [more ▼]

Several studies attempted to identify the Isotropic Boundary (IB) defining the limit between the adiabatic and non-adiabatic trajectories of the trapped protons along closed magnetic field lines. This boundary is an indicator of the amount of magnetic field lines' stretching in the magnetotail. These studies are based on in situ measurements, resulting in spatially and temporally restricted samples. To avoid this limitation, we propose to use global data obtained with the FUV-SI12 proton imager on board IMAGE spacecraft. We determine at each magnetic local time the position of an optical boundary equivalent to IB and thereby the stretching of the magnetic field lines. We show that the correspondence between the latitude of the maximum proton precipitation observed by SI12 and the IB measured by DMSP satellites is statistically established and depends on the magnetic local time. The relation between the position of the maximum proton precipitation as well as the intensity of this maximum and the magnetic field's distortion is determined by comparison with GOES-8 data. We thus suggest that SI12 can be used as a tool for the global determination of the isotropic boundary and to monitor the amount of stretching in the magnetotail. [less ▲]

Detailed reference viewed: 13 (4 ULg)
See detailFUV spectroscopy of the H_2 emission in the Jovian aurora: model update and results
Gérard, Jean-Claude ULg; Dols, V.; Colignon, David ULg et al

in Bulletin of the American Astronomical Society (1998, September 01)

The Jovian aurora exhibits bright emissions mainly due the bright Lyman-alpha line and to radiation from excited singlet states to the ground electronic state extending from 800 to 1600 Angstroms. Above ... [more ▼]

The Jovian aurora exhibits bright emissions mainly due the bright Lyman-alpha line and to radiation from excited singlet states to the ground electronic state extending from 800 to 1600 Angstroms. Above 1200 Angstroms, the molecular spectrum is dominated by the Lyman (B-X) bands and continuum and the Werner (C-X) bands. These transitions have been observed with the Goddard High Resolution Spectrometer (GHRS) and the Space Telescope Imaging Spectrometer (STIS) at various spectral and spatial resolutions. To analyze these spectra, a model synthetic auroral spectrum has been constructed and applied to the analysis of the ro-vibrational temperature of H_2 and a search for non-H_2 emission features. It has been recently updated to include the latest singlet state excitation and cascading cross sections, self-absorption in optically thick lines and to account for the energy distribution of the secondary electrons which cause additional excitation. We illustrate these effects in a few study cases and apply the model to high resolution (0.5 Angstroms) GHRS spectra and low resolution STIS spectra of the entire H_2 spectrum at wavelengths longer than Lyman-alpha. We determine the methane column overlying the auroral emission peak and find that a better fit is obtained with additional absorption by acetylene. [less ▲]

Detailed reference viewed: 20 (4 ULg)
Full Text
Peer Reviewed
See detailA fuzzy approach to the definition of standardized visibility in fog.
Boreux, Jean-Jacques ULg; Duckstein, Lucien

in Applied Mathematics and Computation (1994), 61(2-3), 287-299

The problem of defining the physical concept of standardized visibility is addressed by means of a fuzzy logic approach. Assuming that several hypotheses hold, it is possible to evaluate a standardized ... [more ▼]

The problem of defining the physical concept of standardized visibility is addressed by means of a fuzzy logic approach. Assuming that several hypotheses hold, it is possible to evaluate a standardized visibility Vk (or meteorological visual range) as the ratio of a psychometric coefficient k and the extinction coefficient σ of the aerosol. The main disadvantage of this relationship due to Koschmieder stems from the fact that the meteorological visual range can be very different from visibility estimated by a human observer with normal sight. This is particularly true during fog extinction coefficient supplied by a transmissometer and the corresponding visibility evaluated by an expert. Calculations are performed according to two different approaches. First, a so-called fuzzy hyperbolic model based on a distance defined by Bardossy et al is presented, yielding a crisp (nonfuzzy) value of the coefficient k. Next, we use the multiplication of two fuzzy numbers, taken as triangular, to build an average fuzzy number k that accounts for the different values found in the literature. The defuzzification of k confirms the result obtained by the first approach. [less ▲]

Detailed reference viewed: 21 (7 ULg)
Full Text
Peer Reviewed
See detailFuzzy approximation for convergent model-based reinforcement learning
Busoniu, Lucian; Ernst, Damien ULg; Babuska, Robert et al

in Proceedings of the 2007 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE-07) (2007)

Reinforcement learning (RL) is a learning control paradigm that provides well-understood algorithms with good convergence and consistency properties. Unfortunately, these algorithms require that process ... [more ▼]

Reinforcement learning (RL) is a learning control paradigm that provides well-understood algorithms with good convergence and consistency properties. Unfortunately, these algorithms require that process states and control actions take only discrete values. Approximate solutions using fuzzy representations have been proposed in the literature for the case when the states and possibly the actions are continuous. However, the link between these mainly heuristic solutions and the larger body of work on approximate RL, including convergence results, has not been made explicit. In this paper, we propose a fuzzy approximation structure for the Q-value iteration algorithm, and show that the resulting algorithm is convergent. The proof is based on an extension of previous results in approximate RL. We then propose a modi ed, serial version of the algorithm that is guaranteed to converge at least as fast as the original algorithm. An illustrative simulation example is also provided. [less ▲]

Detailed reference viewed: 17 (1 ULg)
Full Text
Peer Reviewed
See detailFuzzy Control Chart A Better Alternative for Shewhart Average Chart
Faraz, Alireza ULg; MOGHADAM, M. B.

in Quality & Quantity (2007), 41(3), 375-385

This paper through a real illustrative example and a power test shows that designing a fuzzy control chart for process average of a continuous (variable) quality characteristic with a warning line is a ... [more ▼]

This paper through a real illustrative example and a power test shows that designing a fuzzy control chart for process average of a continuous (variable) quality characteristic with a warning line is a better alternative to Shewhart ¯X chart in many respects, like providing better neural view to inspectors, offering different strategic options for company to choose, detecting the desire shifts more quickly, and more sensibility to small shifts without any complexity augmentation to the chart. [less ▲]

Detailed reference viewed: 59 (10 ULg)
See detailFuzzy control of a matter transfomation process
Leclercq, N; Tomiello, Myriam; Crine, Michel ULg et al

Conference (1997, April 24)

Detailed reference viewed: 14 (0 ULg)
Full Text
Peer Reviewed
See detailFuzzy K-NN applied to moulds detection
Kuske, Martyna; Rubio, R.; Nicolas, Jacques ULg et al

in Proceedings of ISOEN'03 (2003, June)

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be ... [more ▼]

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be obtained combining an extended linear discriminant analysis plus a fuzzy k-NN classifier. The classification ability of the classifier is assessed within the dataset by crossvalidation and also in a second dataset collected 5 months later. There is a slight decrease in the classification performance for all the algorithms, being the most sensitive the most accurate one. [less ▲]

Detailed reference viewed: 23 (5 ULg)
Full Text
Peer Reviewed
See detailFuzzy k-NN applied to moulds detection
Kuske, Martyna; Rubio, R.; Romain, Anne-Claude ULg et al

in Sensors and actuators. B, Chemical (2005), 106(1), 52-60

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be ... [more ▼]

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be obtained combining an extended linear discriminant analysis plus a fuzzy k-NN classifier. The classification ability of the classifier is assessed within the dataset by crossvalidation and also in a second dataset collected 5 months later. There is a slight decrease in the classification performance for all the algorithms, being the most sensitive the most accurate one. [less ▲]

Detailed reference viewed: 74 (42 ULg)
Full Text
Peer Reviewed
See detailA Fuzzy Metric for Assessing the Producibility of Straightening in Early Design
Caprace, Jean-David ULg; Aracil Fernandez, Francisco; Losseau, Nicolas ULg et al

in The 14th International Conference on Computer Applications in Shipbuilding (ICCAS) (2009, September 01)

Since several years, the large shipyards use more and more thin plates to build up stiffened panels in order to decrease the structural weight. The major problem relating to the utilization of thin plates ... [more ▼]

Since several years, the large shipyards use more and more thin plates to build up stiffened panels in order to decrease the structural weight. The major problem relating to the utilization of thin plates is the occurrence of welding distortions that have to be eliminated for esthetical and service reasons. This straightening operation involves significant costs and it seems thus important to characterize its economical impact on the global hull fabrication. This paper presents a way to minimize cost in shipbuilding industry by the implementation of a producibility fuzzy metric in order to obtain a better knowledge of the straightening process. Attention has been focused on the definition of fuzzy rules by experts but also on the optimisation of the decision surface to reduce the error compared to actual measurement points. [less ▲]

Detailed reference viewed: 95 (16 ULg)
Full Text
Peer Reviewed
See detailFuzzy partition optimization for approximate fuzzy Q-iteration
Busoniu, Lucian; Ernst, Damien ULg; Babuska, Robert et al

in Proceedings of the 17th IFAC World Congress (IFAC-08) (2008)

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Because exact RL can only be applied to very simple problems, approximate algorithms are usually necessary in practice ... [more ▼]

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Because exact RL can only be applied to very simple problems, approximate algorithms are usually necessary in practice. Many algorithms for approximate RL rely on basis-function representations of the value function (or of the Q-function). Designing a good set of basis functions without any prior knowledge of the value function (or of the Q-function) can be a difficult task. In this paper, we propose instead a technique to optimize the shape of a constant number of basis functions for the approximate, fuzzy Q-iteration algorithm. In contrast to other approaches to adapt basis functions for RL, our optimization criterion measures the actual performance of the computed policies in the task, using simulation from a representative set of initial states. A complete algorithm, using cross-entropy optimization of triangular fuzzy membership functions, is given and applied to the car-on-the-hill example. [less ▲]

Detailed reference viewed: 103 (3 ULg)
Full Text
Peer Reviewed
See detailG protein-coupled receptors, an unexploited animal toxin targets: Exploration of green mamba venom for novel drug candidates active against adrenoceptors
Maïga, Arhamatoulaye; Mourier, Gilles; Quinton, Loïc ULg et al

in Toxicon (2012), 59

At a time when pharmaceutical companies are having trouble finding new low MW drugs and when biologics are becoming more common, animal venoms could constitute an underexploited source of novel drug ... [more ▼]

At a time when pharmaceutical companies are having trouble finding new low MW drugs and when biologics are becoming more common, animal venoms could constitute an underexploited source of novel drug candidates. We looked for identifying novel animal toxins active against G protein-coupled receptors (GPCR), the most frequently exploited class of treatment targets, with the aim to develop novel research tools and drug candidates. Screening of green mamba (Dendroaspis angusticeps) venom against adrenoceptors identified two novel venom peptides. r-Da1a shown an affinity of 0.35 nM for the a1a-AR while r-Da1b displayed affinities between 14 and 73 nM for the three a2-ARs. These two venom peptides have sequences similar to those of muscarinic toxins and belong to the three-finger-fold protein family. a1a-AR is the primary target for the treatment of prostate hypertrophy. In vitro and in vivo tests demonstrated that r-Da1a reduced prostatic muscle tone as efficiently as tamsulosin (an antagonist presently used), but with fewer cardiovascular side effects. a2-ARs are the prototype of GPCRs not currently used as treatment targets due to a lack of specific ligands. Blockage of these receptors increases intestinal motility, which may be compromised by abdominal surgery and reduces orthosteric hypotension. In vitro and in vivo tests demonstrated that r-Da1b antagonizes a2-ARs in smooth muscles and increased heart rate and blood catecholamine concentrations. These results highlight possible exploitation of r-Da1a and r-Da1b in important pathologies. [less ▲]

Detailed reference viewed: 18 (1 ULg)
See detail(G)astronomie - Barres météoritiques
Nazé, Yaël ULg

Article for general public (2013)

Detailed reference viewed: 4 (0 ULg)
See detail(G)astronomie - Big bang cookies
Nazé, Yaël ULg

Article for general public (2013)

Detailed reference viewed: 13 (0 ULg)