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See detailOutbound SPIT Filter with Optimal Performance Guarantees
Jung, Tobias ULg; Martin, Sylvain ULg; Nassar, Mohamed et al

in Computer Networks (2013), 57(7), 16301643

This paper presents a formal framework for identifying and filtering SPIT calls (SPam in Internet Telephony) in an outbound scenario with provable optimal performance. In so doing, our work is largely ... [more ▼]

This paper presents a formal framework for identifying and filtering SPIT calls (SPam in Internet Telephony) in an outbound scenario with provable optimal performance. In so doing, our work is largely different from related previous work: our goal is to rigorously formalize the problem in terms of mathematical decision theory, find the optimal solution to the problem, and derive concrete bounds for its expected loss (number of mistakes the SPIT filter will make in the worst case). This goal is achieved by considering an abstracted scenario amenable to theoretical analysis, namely SPIT detection in an outbound scenario with pure sources. Our methodology is to first define the cost of making an error (false positive and false negative), apply Wald’s sequential probability ratio test to the individual sources, and then determine analytically error probabilities such that the resulting expected loss is minimized. The benefits of our approach are: (1) the method is optimal (in a sense defined in the paper); (2) the method does not rely on manual tuning and tweaking of parameters but is completely self-contained and mathematically justified; (3) the method is computationally simple and scalable. These are desirable features that would make our method a component of choice in larger, autonomic frameworks. [less ▲]

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See detailEffets de lisière sur la productivité du teck (Tectona grandis L.f.): étude de cas des teckeraies privées du Sud-Bénin
Toyi, Mireille Scholastique; Bastin, Jean-François ULg; Andre, Marie ULg et al

in Tropicultura (2013), 31(1), 62-70

The present study aims to improve the production of teak wood (Tectona grandis L.f.) in private plantations in southern Benin through the application of a central concept in landscape ecology: the edge ... [more ▼]

The present study aims to improve the production of teak wood (Tectona grandis L.f.) in private plantations in southern Benin through the application of a central concept in landscape ecology: the edge effect. As teak is an heliophilous species, the hypothesis of a higher wood production in edges was tested on the basis of the basal area. Sixty-two private teak plantations were investigated and 10,667 trees were measured. The stratified sampling scheme in three distinct parts for each plantation (the centre, the edge and the summits) permitted to highlight the edge effect on wood production. For each part, a plot was installed and the diameter at breast height (dbh) was measured for all trees. The leaf area between the edge and the centre of plantations was measured. Finally, the influence of the spatial configuration of plantations and the direction of each side of these plantations on the production of wood was tested. Results show that the edge effect on the production of teak wood affects four planting lines, the first presenting a production of 150% relative to the centre. We noticed a significant influence of the edge on the leaf area of about 218% relative to the centre. No influence of the direction of the sides of the plantation was observed. The shape of the plantations presents a significant influence on the wood production. These results permitted to propose a planting model included in an agroforestry system that optimizes the production of wood per area and having a succession of two planting lines interrupted by fields. [less ▲]

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See detailDeveloppement culturel: l'ambivalence ne signifie pas négation
Vlassis, Antonios ULg

Report (2013)

Adoptée par l’UNESCO en 2005 et entrée en vigueur 2007, la Convention sur la diversité des expressions culturelles (CDEC) est un mécanisme majeur de la régulation internationale des industries culturelles ... [more ▼]

Adoptée par l’UNESCO en 2005 et entrée en vigueur 2007, la Convention sur la diversité des expressions culturelles (CDEC) est un mécanisme majeur de la régulation internationale des industries culturelles. Parmi ses objectifs, nous retrouvons le renforcement du développement culturel et de la coopération culturelle internationale via la mise en place d’un Fonds international pour la diversité culturelle (FIDC) et l’échange de bonnes pratiques entre les Parties. Tenant compte du caractère lacunaire de la littérature récente sur la CDEC relativement au développement culturel, notre article met en lumière les actions prises sur cette question au sein de la mise en œuvre de la CDEC, les implications du FIDC vis-à-vis d’autres programmes de coopération culturelle, ainsi que les mesures innovantes en vue de promouvoir la diversité des expressions culturelles. En ce sens, il s’agit de constater que même si la culture demeure encore le parent pauvre face aux autres aspects du développement durable, des efforts modestes mais pragmatiques cherchent à réaliser une mise en œuvre plus concrète du développement culturel et une intégration lente mais réelle des industries culturelles dans l’aide publique internationale au développement. [less ▲]

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See detailIndividual differences in cognitive representations of action influence the activation of goal concepts
Belayachi, Sanaa ULg; Van der Linden, Martial ULg

in Acta Psychologica (2013), 142(2), 259-264

Goal representations play a key role in various psychological processes, including behavioral regulation, self-perception and social understanding. Research on cognitive representations of action has ... [more ▼]

Goal representations play a key role in various psychological processes, including behavioral regulation, self-perception and social understanding. Research on cognitive representations of action has identified individual differences in the general tendency to construe actions in terms of their goal (vs. movement parameters), which can be reliably assessed with the Behavior Identification Form (BIF). The aim of the present study was to examine how individual differences in action identification, as measured by the BIF, affect online processing of action in a laboratory study. The main results showed that the level of action identification predicted participants' performance in a task designed to implicitly assess people's automatic processing of action regarding goal features. We discussed the possible role of impaired goal processing in psychological dysfunctions. [less ▲]

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See detailLandscape Ecology: a unifying discipline
Bogaert, Jan ULg; Andre, Marie ULg

in Tropicultura (2013), 31(1), 1-2

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See detailTree plantation will not compensate natural woody vegetation cover loss in the Atlantic department of Southern Benin
Toyi, Mireille Scholastique; Barima, Sabas; Mama, Adi et al

in Tropicultura (2013), 31(1),

This study deals with land use and land cover changes for a 33 years period. We assessed these changes for eight land cover classes in the south of Benin by using an integrated multi-temporal analysis ... [more ▼]

This study deals with land use and land cover changes for a 33 years period. We assessed these changes for eight land cover classes in the south of Benin by using an integrated multi-temporal analysis using three Landsat images (1972 Landsat MSS, 1986 Landsat TM and 2005 Landsat ETM+). Three scenarios for the future were simulated using a first-order Markovian model based on annual probability matrices. The contribution of tree plantations to compensate forest loss was assessed. The results show a strong loss of forest and savanna, mainly due to increased agricultural land. Natural woody vegetation (“forest”, “wooded savanna” and “tree and shrub savanna”) will seriously decrease by 2025 due to the expansion of agricultural activities and the increase of settlements. Tree plantations are expected to double by 2025, but they will not compensate for the loss of natural woody vegetation cover. Consequently, we assist to a continuing woody vegetation area decrease. Policies regarding reforestation and forest conservation must be initiated to reverse the currently projected tendencies. [less ▲]

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See detailClassification performance resulting from of 2-means
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg

in Journal of Statistical Planning & Inference (2013), 143(2), 408-418

The k-means procedure is probably one of the most common nonhierachical clustering techniques. From a theoretical point of view, it is related to the search for the k principal points of the underlying ... [more ▼]

The k-means procedure is probably one of the most common nonhierachical clustering techniques. From a theoretical point of view, it is related to the search for the k principal points of the underlying distribution. In this paper, the classification resulting from that procedure for k=2 is shown to be optimal under a balanced mixture of two spherically symmetric and homoscedastic distributions. Then, the classification efficiency of the 2-means rule is assessed using the second order influence function and compared to the classification efficiencies of the Fisher and logistic discriminations. Influence functions are also considered here to compare the robustness to infinitesimal contamination of the 2-means method w.r.t. the generalized 2-means technique. [less ▲]

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See detailHitchcock, ou les psychoses à l'eau de rose
Tomasovic, Dick ULg

Article for general public (2013)

Consacré à la période de conception de Psychose, le drame biographique "Hitchcock", à l’affiche en 2013, transforme l’une des plus palpitantes aventures cinématographiques en une romance tiède. L’ombre de ... [more ▼]

Consacré à la période de conception de Psychose, le drame biographique "Hitchcock", à l’affiche en 2013, transforme l’une des plus palpitantes aventures cinématographiques en une romance tiède. L’ombre de Psychose est peut-être encore à ce point écrasante que l’on n'ose évoquer ce film légendaire que de loin. [less ▲]

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See detailFATAL ALVEOLAR ECHINOCOCCOSIS OF THE LUMBAR SPINE
KEUTGENS, Aurore ULg; SIMONI, Paolo ULg; DETREMBLEUR, Nancy ULg et al

in Journal of Clinical Microbiology (2013), 51(2), 688-91

For the last ten years, the southern part of Belgium has been recognized as a low-risk endemic area for alveolar echinococcosis. This infection, caused by Echinococcus multilocularis, usually induces a ... [more ▼]

For the last ten years, the southern part of Belgium has been recognized as a low-risk endemic area for alveolar echinococcosis. This infection, caused by Echinococcus multilocularis, usually induces a severe liver condition, and can sometimes spread to other organs. However, alveolar echinococcosis involving bones has been described only very rarely. Here, a fatal case of spondylodiscitis due to E. multilocularis contracted in southern Belgium is reported. [less ▲]

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See detailLepton flavor violation and seesaw symmetries
Aristizabal Sierra, Diego ULg

in Hyperfine Interactions (2013, February), 214

When the standard model is extended with right-handed neutrinos the symmetries of the resulting Lagrangian are enlarged with a new global U(1)R Abelian factor. In the context of minimal seesaw models we ... [more ▼]

When the standard model is extended with right-handed neutrinos the symmetries of the resulting Lagrangian are enlarged with a new global U(1)R Abelian factor. In the context of minimal seesaw models we analyze the implications of a slightly broken U(1)R symmetry on charged lepton flavor violating decays. We find, depending on the R-charge assignments, models where charged lepton flavor violating rates can be within measurable ranges. In particular, we show that in the resulting models due to the structure of the light neutrino mass matrix muon flavor violating decays are entirely determined by neutrino data (up to a normalization factor) and can be sizable in a wide right-handed neutrino mass range. [less ▲]

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See detailIl coro del re. Capo e comprimari nella storiografia e nell’epos fra IV e III secolo a.C.
Caneva, Stefano ULg

in Quaderni di Storia (2013), 77

The paper investigates court thiasoi and banquet scenes as well as the general councils of the Macedonian army in the historiography on Alexander and the Successors and in Apollonius’ Argonautica in order ... [more ▼]

The paper investigates court thiasoi and banquet scenes as well as the general councils of the Macedonian army in the historiography on Alexander and the Successors and in Apollonius’ Argonautica in order to show parallels in the representation of the relations between the king and his entourage. The studied cases (Alexander in Asia; Ptolemy in Memphis; Jason in the Argonauts’ councils) allow a reappraisal of the work of the historian Cleitarchus and the poet Apollonius Rhodius and show a common portrait of the leader as primus inter pares. In epic as in historiography, the leader is chosen by the hetairoi on the ground of his outstanding leading skills and his role as a religious chief makes him play a function similar to that of a priest in a thiasos. [less ▲]

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See detailOptimal discovery with probabilistic expert advice: finite time analysis and macroscopic optimality
Bubeck, Sébastien; Ernst, Damien ULg; Garivier, Aurélien

in Journal of Machine Learning Research (2013), 14

We consider an original problem that arises from the issue of security analysis of a power system and that we name optimal discovery with probabilistic expert advice. We address it with an algorithm based ... [more ▼]

We consider an original problem that arises from the issue of security analysis of a power system and that we name optimal discovery with probabilistic expert advice. We address it with an algorithm based on the optimistic paradigm and on the Good-Turing missing mass estimator. We prove two different regret bounds on the performance of this algorithm under weak assumptions on the probabilistic experts. Under more restrictive hypotheses, we also prove a macroscopic optimality result, comparing the algorithm both with an oracle strategy and with uniform sampling. Finally, we provide numerical experiments illustrating these theoretical findings. [less ▲]

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See detailDéveloppements analytiques appliqués à une thématique d'écologie chimique
Heuskin, Stéphanie ULg

Scientific conference (2013, February)

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See detailDu Côté Obscur au Côté Clair de la Force…
Focant, Jean-François ULg

Learning material (2013)

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See detailCapture, Utilisation et Stockage du CO2
Léonard, Grégoire ULg

Scientific conference (2013, February)

Présentation des différentes techniques de capture du CO2, des principales voies de valorisation et de la technologie de stockage sous-terrain du CO2.

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See detailDéveloppement ou dispersion : l’université à l’épreuve de son évolution
Bachelet, Jean-François ULg

in RENAUT, Alain (Ed.) Politiques universitaires et politiques de développement (2013)

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See detail7. Lutte intégrée contre les ravageurs
Chavalle, Sandrine; Censier, Florence ULg; De Proft, Michel

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2013, February)

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See detailPRoNTo: Pattern Recognition for Neuroimaging Toolbox
Schrouff, Jessica ULg; Rosa, Maria Joao; Rondina, Jane et al

in Neuroinformatics (2013)

In the past years, mass univariate statistical analyses of neuroimaging data have been complemented by the use of multivariate pattern analyses, especially based on machine learning models. While these ... [more ▼]

In the past years, mass univariate statistical analyses of neuroimaging data have been complemented by the use of multivariate pattern analyses, especially based on machine learning models. While these allow an increased sensitivity for the detection of spatially distributed effects compared to univariate techniques, they lack an established and accessible software framework. The goal of this work was to build a toolbox comprising all the necessary functionalities formultivariate analyses of neuroimaging data, based on machine learning models. The “Pattern Recognition for Neuroimaging Toolbox” (PRoNTo) is open-source, cross-platform, MATLAB-based and SPM compatible, therefore being suitable for both cognitive and clinical neuroscience research. In addition, it is designed to facilitate novel contributions from developers, aiming to improve the interaction between the neuroimaging and machine learning communities. Here, we introduce PRoNTo by presenting examples of possible research questions that can be addressed with the machine learning framework implemented in PRoNTo, and cannot be easily investigated with mass univariate statistical analysis. [less ▲]

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