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See detailComment améliorer les taux de matières utiles dans le lait ? Solutions actuelles et perspectives ...
Beckers, Yves ULg

Conference given outside the academic context (2014)

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See detailValuation and price expectation mismatch in SME business transfer
Lambert, Marie ULg

Conference (2014, March 26)

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See detailL'homoparentalité, ça dérange qui?
Scali, Thérèse ULg

Speech (2014)

Le concours « Ma thèse en 180 secondes » vise à informer le grand public de la richesse et de l’intérêt des recherches scientifiques, tout en développant les compétences communicationnelles des doctorants ... [more ▼]

Le concours « Ma thèse en 180 secondes » vise à informer le grand public de la richesse et de l’intérêt des recherches scientifiques, tout en développant les compétences communicationnelles des doctorants avec le grand public. Chaque participant (doctorant ou docteur diplômé de l’année académique 2013-2014) présente, en trois minutes, un exposé de vulgarisation en français, clair, concis et convaincant sur sa thèse. Le tout avec l’appui d’une seule diapositive. [less ▲]

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See detailLa prescription des Psychotropes en pédopsychiatrie dans l’enfance
SCHOLL, Jean-Marc ULg

Scientific conference (2014, March 26)

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See detailHistoire humaine des forêts tropicales du nord du Bassin du Congo durant les deux derniers millénaires
Morin-Rivat, Julie ULg; Biwolé, Achille; Bourland, Nils ULg et al

Scientific conference (2014, March 26)

Identifier les indices d’activités humaines anciennes et les mettre en relation avec la composition floristique actuelle grâce à une approche multidisciplinaire.

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See detailIdentification des charbons de bois pour connaître l'histoire passée des forêts tropicales africaines
Morin-Rivat, Julie ULg; De Weerdt, Joëlle; Hubau, Wannes et al

Scientific conference (2014, March 26)

Nous présentons ici différents aspects de l’étude des charbons de bois à travers l’exemple de l’Afrique tropicale

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See detailInternational Law's Belgian Jurists and WWI. Cosmopolitanism of an Elite, Globalization of a Country (Montreal International Colloquium, March 2014)
Genin, Vincent ULg

Conference (2014, March 26)

Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary ... [more ▼]

Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary project “commemorating WWI” launched by the Fédération Wallonie-Bruxelles (French Community), the Steering Group of which is led by Professor Laurence Van Ypersele (Université Catholique de Louvain). The research focuses on the following topic: Experiences and remembrance of Belgian jurists on issues of international law during the First World War (1914-1918). Belgium, that had been neutral since its independence in 1831, soon became an active reflection centre and a land of innovation for international law, as shown by the foundation of the Institute of International Law (IDI) in Ghent in 1873. Belgium’s neutrality was violated in August 1914 and its territory, the only one, was occupied at 90% by the Germans, putting the country in a unique position that encouraged its International Law experts to revise their practices in view of their experiences and their remembrance of war. As a matter of fact, between 1918 and 1940, they held a prominent position on a global scale (LN, etc.). How the field of these law experts, its practices, its networks (European/American) and its international influence (1873-1940) evolved as a result of WWI lies at the heart of our thesis. [less ▲]

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See detailCompact quadratizations of nonlinear binary optimization problems
Crama, Yves ULg; Rodriguez Heck, Elisabeth ULg

Conference (2014, March 25)

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See detailStable isotopes as descriptors of trophic niches
Michel, Loïc ULg

Scientific conference (2014, March 25)

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See detailAcoustic communication in Ophidiiformes: a case study using Ophidion rochei
Kever, Loïc ULg

Doctoral thesis (2014)

A ce jour, la biologie des Ophidiiformes reste peu connue car la majorité des espèces de ce groupe est inféodée aux eaux profondes. Celles qui ne le sont pas ont adopté un mode de vie nocturne, passant la ... [more ▼]

A ce jour, la biologie des Ophidiiformes reste peu connue car la majorité des espèces de ce groupe est inféodée aux eaux profondes. Celles qui ne le sont pas ont adopté un mode de vie nocturne, passant la journée cachées dans le sable, les anfractuosités d’un récif, ou un hôte invertébré en fonction de l’espèce considérée. Des études antérieures ont montré que les appareils de production de sons des Ophidioidei (Ophidiidae et Carapidae) sont complexes et présentent des différences interspécifiques marquées. De plus, l’oreille interne est généralement bien développée. Ces poissons étant actifs dans le noir, la communication acoustique devrait tenir un rôle important dans leur biologie. Ce travail de recherches s’attèle, par différentes approches, à étudier cette thématique en utilisant Ophidion rochei comme cas d’étude. Cet Ophidiidae psammobionte, présente un dimorphisme sexuel marqué au niveau de l’appareil de production de sons avec notamment la présence chez les mâles d’une structure minéralisée à l’avant de la vessie natatoire : le « rocker bone ». Pour mieux cerner la fonction des différentes structures intervenant dans la production et la réception de sons, des comparaisons ont été réalisées avec deux Carapidae : Onuxodon fowleri pour la production de sons et Carapus acus pour la réception de sons. L’étude établit que les espèces O. rochei et C. acus peuvent entendre les sons de leurs conspécifiques. Cependant, l’apport principal de cette partie est la démonstration que la grande taille des otolithes (en valeur absolue ou relative) n’est pas liée à de meilleures capacités auditives. De gros otolithes seraient principalement associés à une plus grande acuité de l’appareil stato-acoustique pour des espèces vivant dans des milieux accidentés. Les mâles et les femelles O. rochei produisent des sons uniquement après le coucher du soleil, durant la période de reproduction qui se déroule de juin à octobre. Ces sons apparaissent courts et tonaux chez les femelles, longs et pulsés chez les mâles. Ces différences dans les signatures acoustiques sont clairement liées au dimorphisme sexuel marqué bien qu’un patron moteur commun soit conservé chez les deux sexes. Brièvement, le muscle sonique dorsal servirait à mettre la vessie natatoire sous tension et le muscle sonique ventral serait à l’origine de l’émission de chaque pulse. De plus, les mâles présentent dans les caractéristiques sonores des différences individuelles marquées qui doivent refléter leur statut reproducteur et/ou leur taille. Chez O. fowleri, les deux sexes possèdent des « rocker bones » de taille et de forme différentes. Les sons enregistrés sont uniquement pulsés, mais ces poissons se distinguent de nombreux téléostéens par leur capacité à moduler le taux de pulsation. La comparaison des morphologies et mécanismes permet de soutenir l’hypothèse selon laquelle les « rocker bones » des deux taxa sont le résultat de convergences évolutives. Chez beaucoup de téléostéens, les sons sont utilisés pour supporter des stimuli d’ordre visuel. Les Ophidioidei étant actifs dans le noir, les contraintes évolutives ont principalement dû se marquer au niveau de l’appareil producteur de sons. En conclusion, la morphologie des appareils de production de sons, le dimorphisme sexuel, les caractéristiques uniques des sons produits, leur moment d’émission dans l’année et dans la journée soulignent la place importante de la communication acoustique au sein des Ophidioidei. [less ▲]

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See detailAbout the Multifractal Nature of Cantor's Bijection
Simons, Laurent ULg; Nicolay, Samuel ULg

Conference (2014, March 25)

In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal ... [more ▼]

In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal nature of this map. This talk is based on a joint work with S. Nicolay. [less ▲]

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See detailNIMEFI: Gene Regulatory Network Inference using Multiple Ensemble Feature Importance Algorithms
Ruyssinck, Joeri; Huynh-Thu, Vân Anh ULg; Geurts, Pierre ULg et al

in PLoS ONE (2014)

One of the long-standing open challenges in computational systems biology is the topology inference of gene regulatory networks from high-throughput omics data. Recently, two community-wide efforts ... [more ▼]

One of the long-standing open challenges in computational systems biology is the topology inference of gene regulatory networks from high-throughput omics data. Recently, two community-wide efforts, DREAM4 and DREAM5, have been established to benchmark network inference techniques using gene expression measurements. In these challenges the overall top performer was the GENIE3 algorithm. This method decomposes the network inference task into separate regression problems for each gene in the network in which the expression values of a particular target gene are predicted using all other genes as possible predictors. Next, using tree-based ensemble methods, an importance measure for each predictor gene is calculated with respect to the target gene and a high feature importance is considered as putative evidence of a regulatory link existing between both genes. The contribution of this work is twofold. First, we generalize the regression decomposition strategy of GENIE3 to other feature importance methods. We compare the performance of support vector regression, the elastic net, random forest regression, symbolic regression and their ensemble variants in this setting to the original GENIE3 algorithm. To create the ensemble variants, we propose a subsampling approach which allows us to cast any feature selection algorithm that produces a feature ranking into an ensemble feature importance algorithm. We demonstrate that the ensemble setting is key to the network inference task, as only ensemble variants achieve top performance. As second contribution, we explore the effect of using rankwise averaged predictions of multiple ensemble algorithms as opposed to only one. We name this approach NIMEFI (Network Inference using Multiple Ensemble Feature Importance algorithms) and show that this approach outperforms all individual methods in general, although on a specific network a single method can perform better. An implementation of NIMEFI has been made publicly available. [less ▲]

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See detailConférence invitée: La démocratie multiculturelle : une idée obsolète ?
Martiniello, Marco ULg

Scientific conference (2014, March 25)

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See detailA new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)
Kleyntssens, Thomas ULg; Esser, Céline ULg; Nicolay, Samuel ULg

Conference (2014, March 25)

This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to ... [more ▼]

This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to compute the spectrum of singularities by using its definition. A multifractal formalism is used to approximate this spectrum. We present a new multifractal formalism for non concave and non increasing spectra based on wavelet leaders. In this talk, an implementation of this formalism is given and several numerical examples are presented. [less ▲]

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See detailA new multifractal formalism based on wavelet leaders : detection of non concave and non increasing spectra (Part I)
Esser, Céline ULg; Kleyntssens, Thomas ULg; Nicolay, Samuel ULg et al

Conference (2014, March 25)

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to ... [more ▼]

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to determine the spectrum of singularities of the signal, which is the Hausdorff dimension of the set of points which have the same Hölder exponent. The spectrum of singularities of many mathematical functions can be determined directly from its definition. However, for many real-life signals, the numerical determination of their Hölder regularity is not feasible. Therefore, one cannot expect to have a direct access to their spectrum of singularities and one has to find an indirect way to compute it. A multifractal formalism is a formula which is expected to yield the spectrum of singularities from quantities which are numerically computable. Several multifractal formalisms based on the wavelet coefficients of a signal have been proposed to estimate its spectrum. The most widespread of these formulas is the so-called thermodynamic multifractal formalism, based on the Frish-Parisi conjecture. This formalism presents two drawbacks: it can hold only for spectra that are concave and it can yield only the increasing part of the spectrum. This first problem can be avoided using Snu spaces. The second one can be avoided using a formalism based on wavelet leaders of the signal. In this talk, we propose a new multifractal formalism, based on a generalization of the Snu spaces using wavelet leaders. It allows to detect non concave and non increasing spectra. An implementation of this method is presented in the talk "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)" of T. Kleyntssens. [less ▲]

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