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See detailDiversité des expressions et numérique: du constat à l'action?
Vlassis, Antonios ULg

E-print/Working paper (2015)

Antonios Vlassis nous livre un compte-rendu des débats de la dernière Conférence des Parties à la Convention sur la protection et la promotion de la diversité des expressions culturelles (CDEC) en ... [more ▼]

Antonios Vlassis nous livre un compte-rendu des débats de la dernière Conférence des Parties à la Convention sur la protection et la promotion de la diversité des expressions culturelles (CDEC) en analysant précisément les enjeux liés au numérique et en décortiquant les prises de position exprimées par différents acteurs. [less ▲]

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See detailObserving Jupiter’s polar stratospheric haze with HST/STIS. An HST White Paper
Grodent, Denis ULg; Bonfond, Bertrand ULg; Nichols, Jonathan D.

E-print/Working paper (2015)

The purpose of this HST white paper is to demonstrate that it is possible to monitor Jupiter’s polar haze with HST/STIS without breaking the ground screening limit for bright objects. This demonstration ... [more ▼]

The purpose of this HST white paper is to demonstrate that it is possible to monitor Jupiter’s polar haze with HST/STIS without breaking the ground screening limit for bright objects. This demonstration rests on a thorough simulation of STIS output from an existing image obtained with HST/WFPC2. It is shown that the STIS NUV-MAMA + F25CIII filter assembly provides a count rate per pixel ~11 times smaller than that obtained for one pixel of WFPC2 WF3 CCD + F218W corresponding filter. This ratio is sufficiently large to cope with the bright solar light scattered by Jupiter’s atmosphere, which was a lesser concern for WFPC2 CCD safety. These STIS images would provide unprecedented spatial and temporal resolution observations of small-scale stratospheric aerosol structures, possibly associated with Jupiter’s complex FUV aurora. [less ▲]

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See detailGouvy Jazz & Blues Festival Août 2015
Sacré, Robert ULg

E-print/Working paper (2015)

Compte rendu du festival BLUES avec photos

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See detailColère des agriculteurs, à qui la faute?
Habran, Maxime ULg

E-print/Working paper (2015)

Depuis le début de l’été, la colère gronde du côté des agriculteurs et pour cause, les prix du lait et de la viande ont atteint des seuils dangereusement bas. Que ce soit en France ou en Belgique, le ... [more ▼]

Depuis le début de l’été, la colère gronde du côté des agriculteurs et pour cause, les prix du lait et de la viande ont atteint des seuils dangereusement bas. Que ce soit en France ou en Belgique, le combat est le même. Les agriculteurs veulent des prix plus élevés pour la viande et pour le lait car actuellement ceux-ci sont inférieurs aux coûts de production. Cette note a pour objectif de répondre à trois questions : d’où vient la crise, quelles sont les solutions et les mesures prises sont-elles suffisantes ? [less ▲]

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See detailLa gestation chez les petits camélidés d'Amérique du Sud : physiologie, constat et pathologie
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

Detailed reference viewed: 23 (2 ULg)
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See detailDoes formal child care availability for 0-3 year olds boost mothers' employment rate? Panel data based evidence from Belgium
Dujardin, Claire; Fonder, Muriel; Lejeune, Bernard ULg

E-print/Working paper (2015)

In 2003, a new multi-annual program aimed at increasing the availability of formal child care for 0-3 year old children was launched in Wallonia, the French-speaking part of Belgium. This paper is ... [more ▼]

In 2003, a new multi-annual program aimed at increasing the availability of formal child care for 0-3 year old children was launched in Wallonia, the French-speaking part of Belgium. This paper is interested in evaluating if this increased availability of formal child care resulted in a higher employment rate for women with at least one child under 3. To this end, we use a difference-in-differences approach based on municipality-level panel data, taking advantage of the fact that the increase in availability of formal child care differed greatly across municipalities. We find that the raise in child care availability significantly increased the maternal employment rate, but to a lesser extent than expected, most likely because of a substantial crowding-out effect. [less ▲]

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See detailThe French language runs throughout the world
Morato, Nicola ULg; Gaunt, Simon

E-print/Working paper (2015)

Detailed reference viewed: 42 (3 ULg)
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See detailFrom Constrained Delaunay Triangulations to Roadmap Graphs with Arbitrary Clearance
Lens, Stéphane ULg; Boigelot, Bernard ULg

E-print/Working paper (2015)

This work studies path planning in two-dimensional space, in the presence of polygonal obstacles. We specifically address the problem of building a roadmap graph, that is, an abstract representation of ... [more ▼]

This work studies path planning in two-dimensional space, in the presence of polygonal obstacles. We specifically address the problem of building a roadmap graph, that is, an abstract representation of all the paths that can potentially be followed around a given set of obstacles. Our solution consists in an original refinement algorithm for constrained Delaunay triangulations, aimed at generating a roadmap graph suited for planning paths with arbitrary clearance. In other words, a minimum distance to the obstacles can be specified, and the graph does not have to be recomputed if this distance is modified. Compared to other solutions, our approach has the advantage of being simpler, as well as significantly more efficient. [less ▲]

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See detailLes biotechnologies de la reproduction des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmo, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

Detailed reference viewed: 25 (2 ULg)
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See detailGarantir la légalité et assurer la traçabilité. Deux piliers de la mise en oeuvre de l'APV-FLEGT.
Moumbogou, Carl; Meunier, Quentin; Bracke, Charles et al

E-print/Working paper (2015)

Detailed reference viewed: 122 (5 ULg)
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See detailLes forêts communautaires et l'APV-FLEGT au Gabon
Moumbogou, Carl; Meunier, Quentin; Mvou Biyogo, T. et al

E-print/Working paper (2015)

Promu par l’Union européenne depuis 2003, le plan d’action FLEGT propose une approche novatrice de lutte contre l’exploitation illégale des forêts, en établissant un lien entre l’amélioration de la ... [more ▼]

Promu par l’Union européenne depuis 2003, le plan d’action FLEGT propose une approche novatrice de lutte contre l’exploitation illégale des forêts, en établissant un lien entre l’amélioration de la gouvernance dans les pays producteurs et l’accès au marché de l’UE. Ce plan concerne tous les titres forestiers, dont les forêts communautaires. Ces dernières ont été désignées au Gabon comme source légale de bois à la faveur des négociations d’un APVFLEGT avec l’UE. Dès lors, et afin de stabiliser le système qui sera mis en place, il est nécessaire de préparer des outils adaptés permettant d’articuler le FLEGT et les forêts communautaires. [less ▲]

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See detailBayesian inference in an extended SEIR model with nonparametric disease transmission rate: an application to the Ebola epidemic in Sierra Leone
Frasso, Gianluca ULg; Lambert, Philippe ULg

E-print/Working paper (2015)

The 2014 Ebola outbreak in Sierra Leone is analyzed using an extension of the SEIR compartmental model. The unknown parameters of the system of differential equations are estimated by combining data on ... [more ▼]

The 2014 Ebola outbreak in Sierra Leone is analyzed using an extension of the SEIR compartmental model. The unknown parameters of the system of differential equations are estimated by combining data on the number of new (laboratory confirmed) Ebola cases reported by the Ministry of Health and prior distributions for the transition rates elicited using information collected by the WHO Response Team (2014) during the follow-up of specific Ebola cases. The evolution over time of the disease transmission rate is modeled nonparametrically using penalized B-splines. Our framework represents a valuable and robust stochastic tool for the study of an epidemic dynamic from irregular and possibly aggregated case data. Simulations and the analysis of the 2014 Sierra Leone Ebola data highlight the merits of the proposed methodology. [less ▲]

Detailed reference viewed: 118 (35 ULg)
See detailLe cycle sexuel de la femelle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

Detailed reference viewed: 30 (0 ULg)
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See detailVariability in the super-Earth 55 Cnc e
Demory, Brice-Olivier; Gillon, Michaël ULg; Madhusudhan, Nikku et al

E-print/Working paper (2015)

Considerable progress has been made in recent years in observations of atmospheric signatures of giant exoplanets, but processes in rocky exoplanets remain largely unknown due to major challenges in ... [more ▼]

Considerable progress has been made in recent years in observations of atmospheric signatures of giant exoplanets, but processes in rocky exoplanets remain largely unknown due to major challenges in observing small planets. Numerous efforts to observe spectra of super-Earths, exoplanets with masses of 1-10 Earth masses, have thus far revealed only featureless spectra. In this paper we report a 4-$\sigma$ detection of variability in the dayside thermal emission from the transiting super-Earth 55 Cancri e. Dedicated space-based monitoring of the planet in the mid-infrared over eight eclipses revealed the thermal emission from its dayside atmosphere varying by a factor 3.7 between 2012 and 2013. The amplitude and trend of the variability are not explained by potential influence of star spots or by local thermal or compositional changes in the atmosphere over the short span of the observations. The possibility of large scale surface activity due to strong tidal interactions possibly similar to Io, or the presence of circumstellar/circumplanetary material appear plausible and motivate future long-term monitoring of the planet. [less ▲]

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See detailAura
Durand, Pascal ULg

E-print/Working paper (2015)

Entrée du Lexique Socius sur le concept d'Aura chez Walter Benjamin

Detailed reference viewed: 113 (11 ULg)
See detailAnatomie de l'appareil génital femelle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Amupero Casquino, Enrique et al

E-print/Working paper (2015)

Detailed reference viewed: 18 (0 ULg)
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See detailOptimal Enforcement of Competition Policy: The Commitments Procedure under Uncertainty
Gautier, Axel ULg; Petit, Nicolas ULg

E-print/Working paper (2015)

Since the introduction of a commitments procedure in EU antitrust policy (Article 9 of Council Regulation 1/2003), the European Commission has extensively settled cases of alleged anticompetitive ... [more ▼]

Since the introduction of a commitments procedure in EU antitrust policy (Article 9 of Council Regulation 1/2003), the European Commission has extensively settled cases of alleged anticompetitive practices. In this paper, we use a formal model of law enforcement (Bebchuk, 1984; Shavell, 1988) to identify the optimal procedure to resolve cases in a context of uncertainty related to the law (L-uncertainty) and to the facts (F-uncertainty). We show that commitments are suboptimal when L-uncertainty is high. Furthermore, the generalized use of commitments creates an additional risk of under-enforcement when F-uncertainty is significant. [less ▲]

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Peer Reviewed
See detailTheories of Self-Preferencing Under Article 102 TFEU: A Reply to Bo Vesterdorf
Petit, Nicolas ULg

E-print/Working paper (2015)

Detailed reference viewed: 19 (3 ULg)
See detailPasseport santé pour bananier
Massart, Sébastien ULg

E-print/Working paper (2015)

Detailed reference viewed: 24 (2 ULg)
Peer Reviewed
See detailLes droits fondamentaux, une substance malléable pour le juge? Propos sur la "dématérialisation" des droits fondamentaux
Rosoux, Géraldine ULg

E-print/Working paper (2015)

Ce texte contient un résumé de la thèse de doctorat de l'auteur; il est disponible en ligne: http://www.justice-en-ligne.be/article706.html.

Detailed reference viewed: 42 (10 ULg)
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See detailThe crucial role of HST during the NASA Juno mission: a “Juno initiative”
Grodent, Denis ULg; Bonfond, Bertrand ULg; Gérard, Jean-Claude ULg et al

E-print/Working paper (2015)

In 2016, the NASA Juno spacecraft will initiate its one-year mission around Jupiter and become the first probe to explore the polar regions of Jupiter. The HST UV instruments (STIS and ACS) can greatly ... [more ▼]

In 2016, the NASA Juno spacecraft will initiate its one-year mission around Jupiter and become the first probe to explore the polar regions of Jupiter. The HST UV instruments (STIS and ACS) can greatly contribute to the success of the Juno mission by providing key complementary views of Jupiter’s UV aurora from Earth orbit. Juno carries an ultraviolet Spectrograph (UVS) and an infrared spectral mapper (JIRAM) that will obtain high-resolution spectral images providing the auroral counterpart to Juno’s in situ particles and fields measurements with the plasma JADE and JEDI particle detectors. The Juno mission will be the first opportunity to measure simultaneously the energetic particles at high latitude and the auroral emissions they produce. Following programmatic and technical limitations, the amount of UVS data transmitted to Earth will be severely restricted. Therefore, it is of extreme importance that HST captures as much additional information as possible on Jupiter’s UV aurora during the one-year life of the Juno mission. This white paper is a plea for a “Juno initiative” that will ensure that a sufficient number of orbits is allocated to this unique solar system mission. [less ▲]

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See detailApproche agroforestière. Synthèse des travaux menés par le projet DACEFI2 en agroforesterie. Document de capitalisation.
Boldrini, Sylvie; Meunier, Quentin; Boukouendji, Basile et al

E-print/Working paper (2015)

Le projet DACEFI-2 a eu pour mission première la promotion de la foresterie communautaire comme outil de développement des communautés rurales. L’approche au Gabon en matière de gestion des terroirs ... [more ▼]

Le projet DACEFI-2 a eu pour mission première la promotion de la foresterie communautaire comme outil de développement des communautés rurales. L’approche au Gabon en matière de gestion des terroirs villageois s’est voulue plus embrassante, promouvant en sus de l’exploitation forestière des activités comme l’agriculture, le maraîchage, la collecte des produits forestiers non ligneux ou encore l’agroforesterie. L’agroforesterie est une thématique qui converge parfaitement avec la gestion raisonnée de la forêt, et idéalement avec les modes d’interaction préexistants des villageois avec celle-ci. Concilier dans un même espace la culture de plantes vivrières et l’accès à des arbres à fort intérêt socio-économique apporte une plus-value notoire aux parcelles cultivées. L’optimisation des techniques culturales permet une meilleure productivité et une incitation à la sédentarisation des cultures, élément important à considérer compte tenu des difficultés d’entretien des parcelles éloignées du village (notamment liées aux dégâts causés par les animaux). Ce recueil compile les travaux réalisés en agroforesterie par les équipes du projet DACEFI-2. Il rappelle la stratégie d’intervention et les différentes activités menées, de la sensibilisation auprès des plus jeunes à la promotion de certains produits forestiers non ligneux à potentiel économique avéré. La promotion de l’arbre, de la récolte de la graine jusqu’à sa plantation en passant par sa mise en pépinière aura également animé toute l’équipe durant ces années d’exercice, afin de faire un peu plus valoir ses multiples intérêts et susciter les efforts de gestion, de conservation et de reboisement. [less ▲]

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Peer Reviewed
See detailAccess to Electoral Rights Bolivia
Zegada, Maria Teresa; Lafleur, Jean-Michel ULg

E-print/Working paper (2015)

The issue of passive and active electoral rights in Bolivia has gone through various phases that are examined in details in this article. Universal suffrage in Bolivia occurred around the same time as in ... [more ▼]

The issue of passive and active electoral rights in Bolivia has gone through various phases that are examined in details in this article. Universal suffrage in Bolivia occurred around the same time as in most states in that region: in the middle of the 20th century. The next wave of reforms occurred during the 1980s when dictatorships were removed from power. At that time, processes of democratization intensified in Bolivia and other parts of Latin America, eventually leading to the progressive strengthening of democratic institutions. It is really during the 1990s and early 2000s that the most important democratic transformations occurred. Major institutional reforms were passed during this period in particular to increase the participation of women and indigenous peoples in public affairs. The inclusion of the principles of gender equality and interculturality in the new constitution of 2009 is one of the clearest sign of this new approach. Similarly, another sector of the Bolivian population that had been traditionally prevented from exercising political rights. that is, Bolivians residing abroad have been closely attended to by the Evo Morales government since 2006. After the first external voting experience in 2009, the system was once again reformed to enable greater participation from abroad in the 2014 presidential election. These elements confirm that the extension of political rights in Bolivia is a process that has gone trough major changes over the past two decades but remains a work in process. [less ▲]

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See detailEfficient Path Interpolation and Speed Profile Computation for Nonholonomic Mobile Robots
Lens, Stéphane ULg; Boigelot, Bernard ULg

E-print/Working paper (2015)

This paper studies path synthesis for nonholonomic mobile robots moving in two-dimensional space. We first address the problem of interpolating paths expressed as sequences of straight line segments, such ... [more ▼]

This paper studies path synthesis for nonholonomic mobile robots moving in two-dimensional space. We first address the problem of interpolating paths expressed as sequences of straight line segments, such as those produced by some planning algorithms, into smooth curves that can be followed without stopping. Our solution has the advantage of being simpler than other existing approaches, and has a low computational cost that allows a real-time implementation. It produces discretized paths on which curvature and variation of curvature are bounded at all points, and preserves obstacle clearance. Then, we consider the problem of computing a time-optimal speed profile for such paths. We introduce an algorithm that solves this problem in linear time, and that is able to take into account a broader class of physical constraints than other solutions. Our contributions have been implemented and evaluated in the framework of the Eurobot contest. [less ▲]

Detailed reference viewed: 47 (16 ULg)
See detailPrélèvement, analyse et conservation du sperme du mâle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

Detailed reference viewed: 18 (0 ULg)
See detailSome misunderstood or unknown tricks (XIII) (LaTeX)
Merciadri, Luca ULg

E-print/Working paper (2015)

We will here again consider many tips and tricks. This time, they will mostly come from Glad Deschrijver, TeX Tricks, 2011. (http://users.ugent.be/~gdschrij/LaTeX/textricks.html.) Tricks: vertically ... [more ▼]

We will here again consider many tips and tricks. This time, they will mostly come from Glad Deschrijver, TeX Tricks, 2011. (http://users.ugent.be/~gdschrij/LaTeX/textricks.html.) Tricks: vertically aligned itemize environments, allowing linebreaks after comma in math mode, writing under and over elements, and using stacks, footnotes with a new number at each section, footnotes in tabular, splitting algorithm environments on multiple pages, let " produce opening/closing quotation marks, indenting some text but not the first line, using diagonal dots positioned according to the opposite diagonal, using a centered verbatim environment, drawing a table with dashed lines, shaded cells and arrows pointing at a row and a column, correct spacing around square brackets (used for sets) in math mode. [less ▲]

Detailed reference viewed: 12 (1 ULg)
See detailSome misunderstood or unknown LaTeX tricks (XIV) and LaTeX learning curve
Merciadri, Luca ULg

E-print/Working paper (2015)

We will here give three tricks: i. using a personalized \overline, ii. boxing every digit of an integer, iii. using \scalebox. I will then expose my point of view about the LaTeX learning curve, and give ... [more ▼]

We will here give three tricks: i. using a personalized \overline, ii. boxing every digit of an integer, iii. using \scalebox. I will then expose my point of view about the LaTeX learning curve, and give some of the most common beginners’ mistakes. [less ▲]

Detailed reference viewed: 3 (0 ULg)
See detailSome misunderstood or unknown LaTeX tricks (XV)
Merciadri, Luca ULg

E-print/Working paper (2015)

After having looked at about 150 StackExchange pages of 50 topics (that sums up to about 7500 topics’ names), I give you, in this article and in the next issue, the most interesting topics’ answers to my ... [more ▼]

After having looked at about 150 StackExchange pages of 50 topics (that sums up to about 7500 topics’ names), I give you, in this article and in the next issue, the most interesting topics’ answers to my eyes. We will first begin by two additions in regard to 31(3), 32(1). [less ▲]

Detailed reference viewed: 22 (2 ULg)
See detailSome misunderstood or unknown LaTeX tricks (XVI)
Merciadri, Luca ULg

E-print/Working paper (2015)

This is the second (and last) part of the tricks I found on StackExchange. First part began in the preceding issue. We will begin by a personal trick, and end by some inquiry about my LaTeX Tips & Tricks.

Detailed reference viewed: 17 (3 ULg)
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See detailImportance et rôle de l’investissement…
Choffray, Jean-Marie ULg

E-print/Working paper (2015)

Quelques observations et réflexions en réponse à une question qui m’est souvent posée sur l’importance et le rôle des investisseurs. Ces « Charognards », particulièrement visés au cours des périodes de ... [more ▼]

Quelques observations et réflexions en réponse à une question qui m’est souvent posée sur l’importance et le rôle des investisseurs. Ces « Charognards », particulièrement visés au cours des périodes de tension géopolitique, de populisme ou de débauche monétaire, semblables à celle que nous vivons aujourd’hui. Ma réponse en peu de mots : les investisseurs sont des défenseurs de la valeur du travail par temps calme et des vigies dans la tempête ! [less ▲]

Detailed reference viewed: 498 (18 ULg)
See detailDocuments as a source of information; Tabular packages' purposes, conflicts; Same space in matrices; Logic inferences
Merciadri, Luca ULg

E-print/Working paper (2015)

The various aspects of the title are considered.

Detailed reference viewed: 42 (16 ULg)
See detailSome misunderstood or unknown tricks (X) (LaTeX)
Merciadri, Luca ULg

E-print/Working paper (2015)

This is the 10th edition of my `Tips & Tricks.' This time, we shall first see how to write `dancing text,' roman numerals, how to draw under and over braces on same elements, and how to display aligned ... [more ▼]

This is the 10th edition of my `Tips & Tricks.' This time, we shall first see how to write `dancing text,' roman numerals, how to draw under and over braces on same elements, and how to display aligned (in)equations systems. We will then end by discussing on BibLaTeX and Biber, which constitute a promising alternative to BibTeX. [less ▲]

Detailed reference viewed: 42 (2 ULg)
See detailSome misunderstood or unknown tricks (XI) (LaTeX) and encoding issues (II)
Merciadri, Luca ULg

E-print/Working paper (2015)

Three subjects will be detailed: 1. Using LaTeX syntax as an unambiguous way to communicate, 2. Writing a bold \ell, 3. Fonts' encodings.

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See detailEntretien avec Kathryn Batchelor
Oumarou Mal Mazou, Rachid ULg

E-print/Working paper (2015)

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Peer Reviewed
See detailTransnational Health Insurance Schemes: A New Avenue for Congolese Immigrants in Belgium to Care for Their Relatives’ Health from Abroad?
Lafleur, Jean-Michel ULg; Lizin, Olivier

E-print/Working paper (2015)

What can immigrants do for non-migrant relatives in their home country who need healthcare they cannot afford? To answer this question, we first examine four existing methods that can be found in the ... [more ▼]

What can immigrants do for non-migrant relatives in their home country who need healthcare they cannot afford? To answer this question, we first examine four existing methods that can be found in the existing literature: mobility, remittances, workers’ health insurance and diasporic health insurance. In the second part of the paper, we discuss an innovative strategy called “transnational health insurance” (THI). These insurance schemes are set up by immigrants in cooperation with a multitude of actors including health insurance companies in destination countries and healthcare providers in countries origin. THIs offer health coverage to non-migrant relatives in the home country based on a premium paid directly by immigrants to the insurance company in their country of residence. Analyzing the creation and implementation of Belgian-Congolese THIs, we discuss the strengths and weaknesses of these schemes in responding to the needs of both immigrants and their non-migrant relatives. The article concludes with a discussion on the specificities of THIs as hybrid forms of remittances. [less ▲]

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See detailPropriété coopérative et acceptabilité sociale de l’éolien terrestre
Bauwens, Thomas ULg

E-print/Working paper (2015)

Onshore wind power development in Belgium has provoked considerable opposition at the local level. To cope with this issue, wind power cooperatives seem to present important assets. This article explores ... [more ▼]

Onshore wind power development in Belgium has provoked considerable opposition at the local level. To cope with this issue, wind power cooperatives seem to present important assets. This article explores the reasons why these organizations are likely to enhance social acceptability of this technology. Then it confronts these normative assumptions with empirical data. The results of this analysis confirm the positive effect of cooperative ownership on the social acceptability of onshore wind turbines. [less ▲]

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See detailA semiparametric model for Generalized Pareto regression based on a dimension reduction assumption
Hambuckers, julien ULg; Heuchenne, Cédric ULg; Lopez, Olivier

E-print/Working paper (2015)

In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a ... [more ▼]

In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semiparametric single-index assumption on the conditional tail index; while no further assumption on the conditional scale parameter is made. The underlying dimension reduction assumption allows the procedure to be of prime interest in the case where the dimension of the covariates is high, in which case the purely nonparametric techniques fail while the purely parametric ones are too rough to correctly fit to the data. We derive asymptotic normality of the estimators that we define, and propose an iterative algorithm in order to perform their practical implementation. Our results are supported by some simulations and a practical application on a public database of operational losses. [less ▲]

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See detailMachine Learning to Balance the Load in Parallel Branch-and-Bound
Marcos Alvarez, Alejandro ULg; Wehenkel, Louis ULg; Louveaux, Quentin ULg

E-print/Working paper (2015)

We describe in this paper a new approach to parallelize branch-and-bound on a certain number of processors. We propose to split the optimization of the original problem into the optimization of several ... [more ▼]

We describe in this paper a new approach to parallelize branch-and-bound on a certain number of processors. We propose to split the optimization of the original problem into the optimization of several subproblems that can be optimized separately with the goal that the amount of work that each processor carries out is balanced between the processors, while achieving interesting speedups. The main innovation of our approach consists in the use of machine learning to create a function able to estimate the difficulty (number of nodes) of a subproblem of the original problem. We also present a set of features that we developed in order to characterize the encountered subproblems. These features are used as input of the function learned with machine learning in order to estimate the difficulty of a subproblem. The estimates of the numbers of nodes are then used to decide how to partition the original optimization tree into a given number of subproblems, and to decide how to distribute them among the available processors. The experiments that we carry out show that our approach succeeds in balancing the amount of work between the processors, and that interesting speedups can be achieved with little effort. [less ▲]

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See detailComment retracer les impacts des projets sur la sécurité alimentaire par la construction d'une chaîne réaliste de LISA 1 à Cobly ?
Tohinlo, Yecy ULg

E-print/Working paper (2015)

Cette note vise à montrer à partir d’un exemple comment retracer une chaine d’effets complexes vers un impact, ici l’amélioration de la sécurité alimentaire des ménages. Elle met en application les ... [more ▼]

Cette note vise à montrer à partir d’un exemple comment retracer une chaine d’effets complexes vers un impact, ici l’amélioration de la sécurité alimentaire des ménages. Elle met en application les principes généraux de l’évaluation réaliste. [less ▲]

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See detailThe role of market-oriented institutions in the deployment of renewable energies: evidences from Europe
Jacqmin, Julien ULg

E-print/Working paper (2015)

This paper investigates the link between economic freedom and the production of energy using renewable sources, with a specific focus on European countries. Using a dynamic panel approach, we find that ... [more ▼]

This paper investigates the link between economic freedom and the production of energy using renewable sources, with a specific focus on European countries. Using a dynamic panel approach, we find that this relationship is positive and significant. The results of our instrumental variable approach indicate further the causal channel between economic freedom and the deployment of renewable energies. Looking at the subcomponents of the economic freedom index, we find that long term price stability and freedom to trade boost the production of renewable energies. However, the importance given to markets, rather than governments, in the economy has no significant impact. [less ▲]

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See detailQue veut dire FLEGT ? Et pourquoi au Gabon ?
Moumbogou, Carl; Meunier, Quentin; Mvou Biyogo, T. et al

E-print/Working paper (2015)

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See detailA branch-and-price algorithm for 2-period vehicle routing problems
Crama, Yves ULg; Rezaei Sadrabadi, Mahmood ULg; Van Woensel, Tom

E-print/Working paper (2015)

We consider a Vehicle Routing Problem (VRP) with deterministic orders in two periods from a set of stores. Orders in period 1 (2) can be postponed (advanced) to the other period but any diversion from the ... [more ▼]

We consider a Vehicle Routing Problem (VRP) with deterministic orders in two periods from a set of stores. Orders in period 1 (2) can be postponed (advanced) to the other period but any diversion from the initial orders incurs a penalty. From the perspective of a Logistics Service Provider (LSP), such diversions could be beneficial if savings in the routing costs outweigh the penalties. So could they be from a store's view, as the store can set a high enough penalty to compensate the diversion from its own optimal orders. In this paper, we introduce a new model where we seek a better solution for the LSP, compared to solving two independent VRPs with fixed orders, by allowing orders to be fully postponed or advanced. We apply a branch-and-price algorithm to solve this model to optimality. Many cutting-edge techniques are implemented to have an efficient branch-and-price algorithm, and two ideas to possibly improve the upper bound are tested. We draw algorithmic and managerial insights based on our test instances. [less ▲]

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See detailInvesting in the Future
Pahud de Mortanges, Charles ULg

E-print/Working paper (2015)

This paper attempts to address the challenges of how to invest in Synthetic Biology firms, most of which are relatively new start-ups and unprofitable. Valuing an early-stage firm with only a brief ... [more ▼]

This paper attempts to address the challenges of how to invest in Synthetic Biology firms, most of which are relatively new start-ups and unprofitable. Valuing an early-stage firm with only a brief operating history, little or no operating profit (or even revenue), and an immature and untested business model, could be a formidable challenge. We propose a limited number of quantitative, and a larger number of qualitative criteria. An investor may consider these when faced with analyzing a new untried business, but one he/she believes has considerable potential for success in the future. [less ▲]

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See detailOn the nature of cosmological time
Magain, Pierre ULg; Hauret, Clémentine ULg

E-print/Working paper (2015)

Time is a parameter playing a central role in our most fundamental modeling of natural laws. Relativity theory shows that the comparison of times measured by different clocks depends on their relative ... [more ▼]

Time is a parameter playing a central role in our most fundamental modeling of natural laws. Relativity theory shows that the comparison of times measured by different clocks depends on their relative motions and on the strength of the gravitational field in which they are embedded. In standard cosmology, the time parameter is the one measured by fundamental clocks, i.e. clocks at rest with respect to the expanding space. This proper time is assumed to flow at a constant rate throughout the whole history of the Universe. We make the alternative hypothesis that the rate at which cosmological time flows depends on the dynamical state of the Universe. In thermodynamics, the arrow of time is strongly related to the second law, which states that the entropy of an isolated system will always increase with time or, at best, stay constant. Hence, we assume that time measured by fundamental clocks is proportional to the entropy of the region of the Universe that is causally connected to them. Under that simple assumption, we build a cosmological model that explains the Type Ia Supernovae data (the best cosmological standard candles) without the need for exotic dark matter nor dark energy. [less ▲]

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See detailSequential testing of k-out-of-n systems with imperfect tests
Wenchao, Wei; Coolen, Kris ULg; Talla Nobibon, Fabrice et al

E-print/Working paper (2015)

A k-out-of-n system configuration requires that, for the overall system to be functional, at least k out of the total of n components be working. We consider the problem of sequentially testing the ... [more ▼]

A k-out-of-n system configuration requires that, for the overall system to be functional, at least k out of the total of n components be working. We consider the problem of sequentially testing the components of a k-out-of-n system in order to learn the state of the system, when the tests are costly and when the individual component tests are imperfect, which means that a test can identify a component as working when in reality it is down, and vice versa. Each component is tested at most once. Since tests are imperfect, even when all components are tested the state of the system is not necessarily known with certainty, and so reaching a lower bound on the probability of correctness of the system state is used as a stopping criterion for the inspection. We define different classes of inspection policies and we examine global optimality of each of the classes. We find that a globally optimal policy for diagnosing k-out-of-n systems with imperfect tests can be found in polynomial time when the predictive error probabilities are the same for all the components. Of the three policy classes studied, the dominant policies always contain a global optimum, while elementary policies are compact in representation. The newly introduced class of so-called `interrupted block-walking' policies combines these merits of global optimality and of compactness. [less ▲]

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See detailLacunary wavelet series on Cantor sets
Esser, Céline ULg

E-print/Working paper (2015)

We construct functions with prescribed multifractal spectra which satisfy the leaders profile method.

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See detailPolicy dialogue: What it is and how it can contribute to evidence-informed decision-making.
Rajan, D; El Husseiny, D; Porignon, Denis ULg et al

E-print/Working paper (2015)

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See detailDoes sector-specific experience matter? The case of European higher education ministers
Lefebvre, Mathieu ULg; Jacqmin, Julien

E-print/Working paper (2015)

This paper looks at the relationship between higher education ministers and the performance of the sector that they govern. Using an original panel dataset with the characteristics of European higher ... [more ▼]

This paper looks at the relationship between higher education ministers and the performance of the sector that they govern. Using an original panel dataset with the characteristics of European higher education ministers, we find that having a past experience in the sector leads to a higher level of performance, as measured by ranking data. Making a parallel with the literature about the impact of education on the educated, we discuss potential explanations behind the impact of this on-the-job learning experience. As we find that this characteristic has no impact on the spendings of the sector, we argue that this academic experience makes them more prone to introduce adequate reforms. Furthermore, we find that this result is driven by ministers with both this sector-specific and an electoral experience, the latter measured by a succesful election at the regional or national level. This tends to show that political credibility should not be overshadowed by the importance of the sector-specific experience of ministers. [less ▲]

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See detailPERFORMANCE ET INVENTION. LE LABORATOIRE DE L’EXPERIENCE ESTHETIQUE
Hagelstein, Maud ULg

E-print/Working paper (2015)

Lorsqu’il cherche à qualifier l’époque de l’art dans laquelle nous baignons actuellement, le philosophe Jacques Rancière parle d’un régime pour lequel l’expérience esthétique serait déterminante ... [more ▼]

Lorsqu’il cherche à qualifier l’époque de l’art dans laquelle nous baignons actuellement, le philosophe Jacques Rancière parle d’un régime pour lequel l’expérience esthétique serait déterminante : sensible (par définition) et prise dans un rapport paradoxal de continuité et d’exception avec l’expérience commune. Le régime esthétique de l’art – celui qui affecte les productions artistiques contemporaines – signerait notamment l’effacement des spécificités des arts (et l’abandon du régime très hiérarchisé des Beaux-Arts) au profit d’une expérience sensible commune à toutes les formes d’expression artistiques . Le propre de l’art serait donc de faire vivre à son spectateur une telle expérience, qui toucherait directement ses sens et son imagination. Une expérience dont la tonalité particulière serait directement reconnaissable. Une expérience en excès par rapport à ses habitudes et qui le ferait basculer progressivement dans le domaine si singulier de l’art. On voudrait ici défendre l’idée suivante : la performance artistique semble l’une des animatrices principales de ce régime contemporain en tant qu’elle vise à dégager – au-delà des particularismes des médias d’expression – un territoire très large (un laboratoire) d’expérimentation pour l’art. À travers leurs propositions, les artistes performeurs ne produisent pas des œuvres d’art (c’est-à-dire des produits finis), ils montrent le travail de la créativité à l’œuvre. [less ▲]

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See detailSocial Enterprise in Belgium: A Diversity of Roots, Models and Fields
Huybrechts, Benjamin ULg

E-print/Working paper (2015)

This working paper is structured as follows. The first introductory section reviews the main historical roots that have led to the emergence of a diversity of models related to social enterprise and the ... [more ▼]

This working paper is structured as follows. The first introductory section reviews the main historical roots that have led to the emergence of a diversity of models related to social enterprise and the social economy in Belgium. Next, the second section sketches the main features of these models in terms of legal forms, types of social missions addressed, governance dynamics and resources. In the third section, these models are then illustrated in different fields of activity both established and emerging. Finally, the fourth section proposes a transversal analysis of the main trends and challenges facing the development and coexistence of the different models. [less ▲]

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See detailCritical analysis and alternative processing of Type Ia supernovae data
Hauret, Clémentine ULg; Magain, Pierre ULg

E-print/Working paper (2015)

Context: Type Ia Supernovae (SNIa) observations in the late 90’s were the first hints for an accelerated expansion of our Universe. Today, hundreds of objects have been observed and seem to confirm the ... [more ▼]

Context: Type Ia Supernovae (SNIa) observations in the late 90’s were the first hints for an accelerated expansion of our Universe. Today, hundreds of objects have been observed and seem to confirm the flat LambdaCDM model as the cosmological model best representing our Universe. Aims: We study the SNIa observations gathered in the Union 2.1 and in the JLA compilations. By analyzing correlations and different ways of comparing cosmological models to the data, we bring to light some statistical biases, due to the current way of computing SNIa luminosity corrections for light-curve shape, color and host galaxy mass. Methods: We suggest an alternative, safer and model-independent methodology to calibrate the luminosity corrections, using only nearby SNIa. Results: With our recalibrated data, biases are strongly reduced. Moreover, open cosmological models are shown to be favoured over flat models (Omega_m,0 = 0.26+-0.08, Omega_Lambda,0 = 0.66+-0.12 for the SCP compilation and Omega_m,0 = 0.20+-0.08, Omega_Lambda,0 = 0.56+- 0.13 for the JLA one). Conclusions: The usual method to process SNIa data, i.e. simultaneously determining the parameters of the cosmological model and of the luminosity corrections on the full sample, is prone to bias the data in favour of the assumed cosmology, currently a flat LambdaCDM model, as well as to bias the cosmological parameters of the assumed model. [less ▲]

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See detailNon-renewable and intermittent renewable energy sources: friends and foes?
baranes, edmond; Jacqmin, Julien ULg; poudou, jean-christophe

E-print/Working paper (2015)

This paper studies the links between non-renewable and intermittent renewable energy sources in the production of electricity. We argue that the relationship between the price of natural gas and ... [more ▼]

This paper studies the links between non-renewable and intermittent renewable energy sources in the production of electricity. We argue that the relationship between the price of natural gas and investments in solar and wind capacity is represented by a bell-shaped curve, as opposed to being linear. Hence, for relatively low natural gas prices, the two modes of production are substitutes. After a price threshold is reached, the two are complementary. A theoretical model explains this as the trade-off resulting from two forces: the input price differential of these two modes of production and the risks related to the unpredictable nature of renewable energy. Using U.S. state-level data from 1998 to 2012, we find that this relationship is robust to various empirical specifications. [less ▲]

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See detailLa locura como compromiso : Un Quijote actual
Francois, Jeromine ULg

E-print/Working paper (2015)

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See detailDoes sector-specific experience matter? The case of European higher education ministers
Jacqmin, Julien ULg; Lefebvre, Mathieu ULg

E-print/Working paper (2015)

This paper looks at the relationship between higher education ministers and the performance of the sector that they govern. Using an original panel dataset with the characteristics of European higher ... [more ▼]

This paper looks at the relationship between higher education ministers and the performance of the sector that they govern. Using an original panel dataset with the characteristics of European higher education ministers, we find that having a past experience in the sector leads to a higher level of performance, as measured by ranking data. Making a parallel with the literature about the impact of education on the educated, we discuss potential explanations behind the impact of this on-the-job learning experience. As we find that this characteristic has no impact on the spendings of the sector, we argue that this academic experience makes them more prone to introduce adequate reforms that makes the sector more attractive for top-researchers. Furthermore, we find that this result is driven by ministers with both this sector-specific and an electoral experience, the latter measured by a successful election at the regional or national level. This tends to show that political credibility should not be overshadowed by the importance of the sector-specific experience of ministers. [less ▲]

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See detailLe Petit Bottin des Lettres et des Arts : discours et effets d’une topographie fin de siècle
Saint-Amand, Denis ULg

E-print/Working paper (2015)

Publication des actes de la journée d'étude de la SERD (2011), supervisée par J.-L. Diaz et J.-D. Wagneur

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See detailWork Capacity and Longer Working Lives in Belgium
Jousten, Alain ULg; Lefebvre, Mathieu ULg

E-print/Working paper (2015)

We explore the link between health indicators and employment rates of the population aged 55 or more. Our focus lies on work capacity as a key determinant of employment. Using cohort mortality information ... [more ▼]

We explore the link between health indicators and employment rates of the population aged 55 or more. Our focus lies on work capacity as a key determinant of employment. Using cohort mortality information as a proxy for overall health outcomes, we establish a substantial untapped work capacity in the population 55+. Similar results are obtained when relying on individual-level objective and subjective health and socioeconomic parameters as predictors. [less ▲]

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See detail3-dimensional Continued Fraction Algorithms Cheat Sheets
Labbé, Sébastien ULg

E-print/Working paper (2015)

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Peer Reviewed
See detailOn some symmetric multidimensional continued fraction algorithms
Labbé, Sébastien ULg; Arnoux, Pierre

E-print/Working paper (2015)

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See detailA Perron theorem for matrices with negative entries and applications to Coxeter groups
Labbé, Sébastien ULg; Labbé, Jean-Philippe

E-print/Working paper (2015)

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See detailOn a group theoretic generalization of the Morse-Hedlund theorem
Charlier, Emilie ULg; Puzynina, Svetlana; Zamboni, Luca

E-print/Working paper (2015)

In their 1938 seminal paper on symbolic dynamics, Morse and Hedlund proved that every aperiodic infinite word contains at least n+ 1 distinct factors of each length n. They further showed that an infinite ... [more ▼]

In their 1938 seminal paper on symbolic dynamics, Morse and Hedlund proved that every aperiodic infinite word contains at least n+ 1 distinct factors of each length n. They further showed that an infinite word has exactly n+ 1 distinct factors of each length n if and only if it is binary, aperiodic and balanced, i.e., it is a Sturmian word. In this paper we obtain a broad generalization of the Morse-Hedlund theorem via group actions. [less ▲]

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See detailReal options valuation under uncertainty
Platania, Federico ULg; Lambert, Marie ULg; Moreno, Manuel

E-print/Working paper (2015)

In this paper we develop a novel valuation model and methodology to value a pharmaceutical R&D project based on real options approach. The real options approach enables the possibility of optimally ... [more ▼]

In this paper we develop a novel valuation model and methodology to value a pharmaceutical R&D project based on real options approach. The real options approach enables the possibility of optimally abandon the project before completion whenever the investment cost turns out to be larger than the expected net cash flow stream. On the other hand, the proposed model accounts for two different sources of uncertainty, those are technical and economic risk. This model incorporates a novel economic state vector where each economic state captures the interaction among different market and economic forces using Fourier series as the particular basis for the economic function space. In this sense, Fourier series are considered as an aggregate of forces playing a relevant role in the process evolution determining the cash flow structure and also allowing us to properly define an economic scenario where the project will be developed. [less ▲]

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See detailPatterns of administrative integration in the European Union: a cross-country empirical analysis of political intentions to reform national public administrations (1997-2011)
Esposito, Giovanni ULg; Gaeta, Giuseppe Lucio; Trasciani, Giorgia

E-print/Working paper (2015)

In the aftermath of the worst financial and economic crisis in generations, the modernization of public administrations of the EU’s Member States (MSs) is among the structural reforms recommended by the ... [more ▼]

In the aftermath of the worst financial and economic crisis in generations, the modernization of public administrations of the EU’s Member States (MSs) is among the structural reforms recommended by the European Commission to relaunch growth in the European economy. This type of reforms has a longstanding tradition in the MSs as they sharply intensified during the 1990s following the paradigm of New Public Management (NPM). Indeed, by backing NPM-style reforms, the European Commission has fostered convergence between the administrative systems of the MSs based on a soft strategy of integration where, instead of establishing binding pan-European rules enforced directly in all the MSs, it has set a number of regulatory standards implemented in the MSs with the support of national legislators and political parties. This paper empirically addresses the above-mentioned process of soft integration by unveiling the domestic determinants that have led MSs’ political parties to call for NPM-style reforms in their national contexts between 1997 and 2011. The hypothesis tested in this study is that MSs’ political parties have called for NPM-style reforms in order to respond to specific challenges issuing from the macro-economic, institutional and political configuration of their domestic contexts. The contribution of this paper is twofold. On the one hand, it contributes to a better understanding of the process of European administrative integration by providing robust empirical evidence about the patterns of diffusion NPM-style reforms across the MSs of the EU. On the other hand, the empirical evidence provided by this paper for the comprehension of NPM-style reforms in the context of the EU also contributes to a better understanding of some traditional theories addressing the reasons of the worldwide striking international trend of the NPM paradigm. [less ▲]

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See detailThe European Public Sectors in The Age of Managerialism: a cross-country empirical study reconstructing the political history of public administrations in Europe during the XX century
Esposito, Giovanni ULg; Gaeta, Giuseppe Lucio

E-print/Working paper (2015)

During the XX century European administrative systems have undergone a profound process of managerial revolution during which private sector managerial tools and principles have spread across both central ... [more ▼]

During the XX century European administrative systems have undergone a profound process of managerial revolution during which private sector managerial tools and principles have spread across both central and local governments in many countries. As many scholars have associated this process of change with the raise and diffusion of a managerialist ideology, this paper empirically investigates the electoral propaganda that since 1950s has supported the diffusion of managerialist values across the national administrative systems of the European countries. On the basis of a longitudinal study of the electoral programs released by the European parties since 1950s, this research provides evidence-based knowledge about: i) the different patterns of diffusion of the public-sector managerialist propaganda in Eastern and Western Europe; ii) the controversial relationship that exists between the spread of the managerialist ideology and the actual adoption of managerialist reforms in the national structures of the public sector. [less ▲]

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See detailNotice de Barlaam et Josaphat : les versions anonymes françaises (Arlima)
Lambert, Adelaïde ULg

E-print/Working paper (2015)

Contribution au site internet ARLIMA — Archives de littérature du Moyen Âge. Notice des cinq versions françaises anonymes du XIIIe s. de Barlaam et Josaphat : la version champenoise en prose, l'abrégé en ... [more ▼]

Contribution au site internet ARLIMA — Archives de littérature du Moyen Âge. Notice des cinq versions françaises anonymes du XIIIe s. de Barlaam et Josaphat : la version champenoise en prose, l'abrégé en prose de la version champenoise, la traduction française de la version grecque du Mont Athos, la version en vers octosyllabiques et la mise en prose de la version en vers octosyllabiques. Les fiches, composées d'une description des textes (datation, forme, témoins, etc.) assortie d'une bibliographie complète (éditions et études critiques), établissent un bilan de l'état de la recherche sur ces versions. [less ▲]

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See detailICSEM Working Paper Series: Comparing Social Enterprise Models Worldwide
Defourny, Jacques ULg; Nyssens, Marthe

E-print/Working paper (2015)

The International Comparative Social Enterprise Models (ICSEM) Project takes place within the Inter-University Attraction Pole on Social Enterprise (IAP-SOCENT) funded by the Belgian Science Policy and ... [more ▼]

The International Comparative Social Enterprise Models (ICSEM) Project takes place within the Inter-University Attraction Pole on Social Enterprise (IAP-SOCENT) funded by the Belgian Science Policy and coordinated by the Centre for Social Economy, HEC Liege, University of Liege (2012-2017). It involves more than 200 researchers from 50 countries across the world. the ICSEM Working Paper Series is made of country contributions focusing on social enterprise models at the national level. [less ▲]

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See detailHYBRID INVESTIGATION OF AIR TRANSPORT PROCESSES IN MODERATELY SLOPED STEPPED SPILLWAY FLOWS
Valero Huerta, Daniel ULg; Bung, Daniel B.

E-print/Working paper (2015)

In stepped spillway flows, a self-aerated flow region is often found where large quantities of air may be entrained into the water body. This air is then mixed with the water phase leading to an air-water ... [more ▼]

In stepped spillway flows, a self-aerated flow region is often found where large quantities of air may be entrained into the water body. This air is then mixed with the water phase leading to an air-water mixture flow with different characteristics than the clear water flow. Thus, air entrainment is an important flow feature which needs to be considered for safe design of these hydraulic structures. Advances in the development of new air-water measurement techniques and numerical modeling capabilities allow addressing these complex problems. Computational Fluid Dynamics (CFD) modeling can be a powerful supplement for physical model tests. In the presented study, the self-aeration process and the subsequent air transport in the aerated flow region of a stepped spillway model is investigated by means of both, new experimental and numerical methods. The slope of the spillway model is 1:2 and different flow rates are considered involving a skimming flow regime. For the physical model tests, a double-tip conductivity probe and ultrasonic sensors are used to evaluate air-water flow properties and flow depths, respectively. Additionally, high-speed camera recordings help to qualitatively analyze the air-water transport. In the numerical model, the same stepped spillway is simulated with identical flow conditions. A RANS approach coupled with RNG k-ε turbulence modeling and a VOF technique for free surface tracking is used. The determination of the inception point and the entrained air quantities are estimated employing a subscale model. To verify the numerical model, results are compared to the laboratory air-water measurements. The comparison of results from both techniques helps to identify their capabilities and limitations. [less ▲]

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See detailIMAGE PROCESSING FOR BUBBLE IMAGE VELOCIMETRY IN SELF-AERATED FLOWS
Bung, Daniel B.; Valero Huerta, Daniel ULg

E-print/Working paper (2015)

In this study, different preprocessing techniques have been applied in order to test if the accuracy of Bubble Image Velocimetry (BIV) calculations in self-aerated flows can be improved. For this purpose ... [more ▼]

In this study, different preprocessing techniques have been applied in order to test if the accuracy of Bubble Image Velocimetry (BIV) calculations in self-aerated flows can be improved. For this purpose, high-speed movies with a resolution of 1920 × 1200 px and a frame rate of 730 Hz are captured on a stepped spillway model with a Phantom M120 camera supplied by LaVision. BIV results are obtained by application of the open-source Matlab® toolbox PIVlab and compared to intrusive data from a double-tip conductivity probe. Averaging velocity fields from 249 frame pairs help to obtain robust results. Therefore, BIV is carried out in a loop with preceding variation of image processing techniques. Results show some potential improvement for the same cross correlation algorithm and post-processing options. However, BIV results tend to underestimate flow velocities when compared to the conductivity probe data. [less ▲]

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See detailLa guerre des chous. Monographie Kaol Kozh
Hecquet, Corentin ULg

E-print/Working paper (2015)

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See detailA NLP-MILP iterating algorithm for operational planning in electrical distribution systems
Gerard, Damien ULg; Louveaux, Quentin ULg; Cornélusse, Bertrand ULg

E-print/Working paper (2015)

We consider a class of optimal power flow (OPF) applications where some loads offer a modulation service in exchange for an activation fee. These applications can be modeled as multi-period formulations ... [more ▼]

We consider a class of optimal power flow (OPF) applications where some loads offer a modulation service in exchange for an activation fee. These applications can be modeled as multi-period formulations of the OPF with discrete variables that define mixed-integer non-convex mathematical programs. We focus on the optimization of this Mixed-Integer Non-Linear Programming (MINLP) problem through a separation into a non-linear programming (NLP) and a mixed-integer programming (MIP) component. The NLP is a feasibility problem involving the power flow equations and the flexible loads needs. The MIP is used to choose which flexible loads to activate and in which order. In several papers, the MIP is based on a linearization of the non-linear power flow equations. We compare several variants of the linearization. We propose new formulations based on prior knowledge of the network to improve the decision-making process when the relaxation is inappropriate. We show computationally with many real-world instances that they help find feasible solutions faster than standard MINLP techniques. [less ▲]

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See detailTowards generic image classification: an extensive empirical study
Marée, Raphaël ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

E-print/Working paper (2014)

This paper considers the general problem of image classification without using any prior knowledge about image classes. We study variants of a method based on supervised learning whose common steps are ... [more ▼]

This paper considers the general problem of image classification without using any prior knowledge about image classes. We study variants of a method based on supervised learning whose common steps are the extraction of random subwindows described by raw pixel intensity values and the use of ensemble of extremely randomized trees to directly classify images or to learn image features. The influence of method parameters and variants is thoroughly evaluated so as to provide baselines and guidelines for future studies. Detailed results are provided on 80 publicly available datasets that depict very diverse types of images (more than 3800 image classes and over 1.5 million images). [less ▲]

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See detailAnatomie et physiologie de la reproduction du male des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2014)

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See detailDiscovery of WASP-85Ab: a hot Jupiter in a visual binary system
Brown, D. J. A.; Anderson, D. R.; Armstrong, D. J. et al

E-print/Working paper (2014)

We report the discovery of the transiting hot Jupiter exoplanet WASP-85Ab. Using a combined analysis of spectroscopic and photometric data, we determine that the planet orbits its host star every 2.66 ... [more ▼]

We report the discovery of the transiting hot Jupiter exoplanet WASP-85Ab. Using a combined analysis of spectroscopic and photometric data, we determine that the planet orbits its host star every 2.66 days, and has a mass of 1.09+/-0.03 M_Jup and a radius of 1.44+/-0.02 R_Jup. The host star is of G5 spectral type, with magnitude V=11.2, and lies 125+/-80 pc distant. We find stellar parameters of T_eff=5685+/-65 K, super-solar metallicity ([Fe/H]=0.08+/-0.10), M_star=1.04+/-0.07 M_sun and R_star=0.96+/-0.13 R_sun. The system has a K-dwarf binary companion, WASP-85B, at a separation of approximately 1.5". The close proximity of this companion leads to contamination of our photometry, decreasing the apparent transit depth that we account for during our analysis. Without this correction, we find the depth to be 50 percent smaller, the stellar density to be 32 percent smaller, and the planet radius to be 18 percent smaller than the true value. Many of our radial velocity observations are also contaminated; these are disregarded when analysing the system in favour of the uncontaminated HARPS observations, as they have reduced semi-amplitudes that lead to underestimated planetary masses. We find a long-term trend in the binary position angle, indicating a misalignment between the binary and orbital planes. WASP observations of the system show variability with a period of 14.64 days, indicative of rotational modulation caused by stellar activity. Analysis of the Ca ii H+K lines shows strong emission that implies that both binary components are strongly active. We find that the system is likely to be less than a few Gyr old. WASP-85 lies in the field of view of K2 Campaign 1. Long cadence observations of the planet clearly show the planetary transits, along with the signature of stellar variability. Analysis of the K2 data, both long and short cadence, is ongoing. [less ▲]

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See detailLettre d'information du projet Dacefi-Synthèse & réalisations majeures
Meunier, Quentin; Morin, Amélie; Moumbougou, Carl et al

E-print/Working paper (2014)

Cette dernière lettre d'information du projet présente le bilan de ses réalisations et les avancées importantes du Gabon en termes de foresterie communautaire

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See detailProjet DACEFI 2. Principes fondateurs d'une forêt communautaire au Gabon. Outils de vulgarisation et de sensibilisation.
Meunier, Quentin; Boldrini, Sylvie; Larzillière, Adélaïde et al

E-print/Working paper (2014)

Faisant suite à une première phase (2006-2008), le projet pilote Développement d’Alternatives Communautaires à l’Exploitation Forestière Illégale (DACEFI-2, de 2010 à 2014) s’emploie à tester au Gabon la ... [more ▼]

Faisant suite à une première phase (2006-2008), le projet pilote Développement d’Alternatives Communautaires à l’Exploitation Forestière Illégale (DACEFI-2, de 2010 à 2014) s’emploie à tester au Gabon la mise en oeuvre des premières forêts communautaires. Un de ses objectifs majeurs consiste à tester le concept de foresterie communautaire au sein de plusieurs sites partenaires et de témoigner de l’expérience acquise afin que le Ministère en charge des Forêts adapte le cadre réglementaire. Quatre textes majeurs régissent la foresterie communautaire au Gabon, une loi (n°16/01), un décret d’application (n°1028/PR/MEFEPEPEN) et deux arrêtés (n°018/MEF/SG/DGF/DFC et n°106/MEFEPRN). Ils encadrent le processus de création d’une forêt communautaire. Afin de les rendre accessibles à un plus grand nombre, le projet DACEFI-2 s’est proposé de développer plusieurs supports de vulgarisation à destination des agents des Eaux et Forêts et des villageois. En éditant et en diffusant une série de posters, de films ou encore de bandes dessinées, le projet a contribué à faire connaître dans les provinces de l’Ogooué-Ivindo et du Moyen-Ogooué, l’esprit de ces textes légaux qui visent à favoriser le développement des communautés locales. Ce document de capitalisation présente une compilation des outils développés par les équipes du projet pour mener à bien cette campagne de sensibilisation. Nous abordons la gestion forestière durable par le prisme de la foresterie communautaire en évoquant l’esprit de la loi et les enjeux de la foresterie sociale. Nous proposons également une série de recommandations, basées sur notre expérience au Gabon, afin d’optimiser l’efficacité des communautés engagées dans ce processus. [less ▲]

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See detailAspects juridiques de la fiscalité du logement en Wallonie
Bahi, Sacha; Bianchet, Bruno ULg; Farah, Jihad ULg et al

E-print/Working paper (2014)

Ce numéro des « Notes de recherche » synthétise un des volets d’une étude dont l’objet est « la fiscalité relative au logement et l’aménagement du territoire ». Or, afin de bien appréhender les tenants et ... [more ▼]

Ce numéro des « Notes de recherche » synthétise un des volets d’une étude dont l’objet est « la fiscalité relative au logement et l’aménagement du territoire ». Or, afin de bien appréhender les tenants et les aboutissants de cette causalité et, surtout, de formuler des recommandations et propositions relatives au système fiscal en regard d’objectifs territoriaux, une analyse approfondie du cadre juridique s’avère indispensable. Cet examen constitue, en soi, un tout cohérent auquel pourra se référer le praticien de la gestion territoriale. La présente réflexion vise ainsi à présenter les divers mécanismes juridiques qui constituent des impôts frappant les biens immobiliers affectés au logement en Wallonie. L’étude s’intéresse principalement au territoire géographique wallon et non pas au seul pouvoir taxateur : « Région wallonne ». La précision est d’importance, a fortiori depuis l’entrée en vigueur de la sixième Réforme de l’État qui élargit considérablement la compétence du législateur wallon en la matière. Sont donc traités dans ce cadre tant les impôts fédéraux que régionaux, sans oublier les diverses « taxes locales » propres à chacune des communes et provinces de Wallonie. Les impôts directs, comme les impôts indirects seront analysés. Partant de ce balayage législatif de lege lata, la réflexion s’efforce de faire ressortir les diverses nuances politiques qui se dégagent des impôts analysés. Le doigt est tantôt mis sur les lacunes légistiques des textes, tantôt sur les critiques jurisprudentielles adressées aux taxes, tantôt encore, sur les potentialités qu’offriraient la redéfinition ou le recalibrage d’un mécanisme existant. L’étude vise, lorsqu’une possibilité lui est laissée, à formuler des propositions de lege feranda afin d’affermir la légalité de certains mécanismes fiscaux et d’améliorer l’utilisation qui est faite de ceux-ci à l’heure actuelle. [less ▲]

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See detailLa mora débitoris chez Charles de Méan (esquisse)
Lagasse, Benoît ULg

E-print/Working paper (2014)

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Peer Reviewed
See detailPremières mises en liberté avant jugement devant la Cour pénale internationale
Deprez, Christophe ULg

E-print/Working paper (2014)

Ce billet évoque les premières libérations avant jugement intervenues devant la Cour pénale internationale (octobre 2014). Après avoir été soumis à un comité de lecture, il a été publié sur le 'blogue' de ... [more ▼]

Ce billet évoque les premières libérations avant jugement intervenues devant la Cour pénale internationale (octobre 2014). Après avoir été soumis à un comité de lecture, il a été publié sur le 'blogue' de la Clinique de droit international pénal et humanitaire de l'Université de Laval. [less ▲]

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See detailCorporate board attributes and conditional accounting conservatism: Evidence from French firms
Boussaid, Nabila ULg; Sougné, Danielle ULg; Hamza, Taher

E-print/Working paper (2014)

In this paper we investigate the relationship between boards of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model to evaluate this ... [more ▼]

In this paper we investigate the relationship between boards of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model to evaluate this relationship for the period 2009-2012, our empirical results can be summarized as follows. Firstly, greater board activity encourages more conservative reporting in financial statements. Secondly, greater board size diminishes conditional accounting conservatism. Lastly, there is a positive relationship between gender diversity and conservatism. To ensure robustness we have calculated our results using alternative measures of accounting conservatism, namely time series and accrual-based measures in addition to asymmetric timeliness of earnings. These findings suggest that boards of directors’ attributes are an important factor in determining the financial reporting quality of French firms. [less ▲]

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See detail"Quarante acres". Traduction d'un poème de Derek Walcott en hommage à Barack Obama (2008)
Bada, Valérie ULg

E-print/Working paper (2014)

Poème écrit par Derek Walcott en 2008 en hommage au nouveau président Barack Obama

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See detailMOLIERE PROJECT - Belgian National Report
Naedenoen, Frédéric ULg

E-print/Working paper (2014)

This document aims at introducing the restructuring phenomena in Belgium. It makes part of a larger project (called the MOLIERE project) undertaken by eleven European countries gathered to analyse ... [more ▼]

This document aims at introducing the restructuring phenomena in Belgium. It makes part of a larger project (called the MOLIERE project) undertaken by eleven European countries gathered to analyse restructurings. This national document follows a common reporting format: an introduction of the complex Belgian restructuring frameworks (1), a presentation of the main actors involved in the process (2), a synthesis of the measures created to anticipate change (3) and a synthesis of the measures established to manage change (4). [less ▲]

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See detailLe nouveau cadre d’action en matière de climat et d’énergie à l’horizon 2030
Habran, Maxime ULg

E-print/Working paper (2014)

Cette note a pour but de fournir un éclairage sur le nouveau cadre d'action européen en matière de climat et d'énergie

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See detailLe numerique dans l'aide multilatérale en matière de culture
Vlassis, Antonios ULg

E-print/Working paper (2014)

En premier lieu, le numéro de novembre traite de la place du numérique dans l’aide multilatérale en matière d’industries culturelles, se penchant sur le programme ACPCultures+ financé par l’Union ... [more ▼]

En premier lieu, le numéro de novembre traite de la place du numérique dans l’aide multilatérale en matière d’industries culturelles, se penchant sur le programme ACPCultures+ financé par l’Union européenne (UE) et géré par le Secrétariat du Groupe des pays ACP (Afrique, Caraïbes, Pacifique). En deuxième lieu, nous traitons de l’évolution récente des négociations commerciales, et surtout du mandat du Conseil européen ‐ rendu public au début d’octobre ‐ pour les négociations pour un partenariat transatlantique entre l’UE et les États‐Unis. En troisième lieu, nous mettons l’accent sur un grand nombre de questions centrales de la gouvernance mondiale de la culture, telles que la Déclaration de Florence sur le lien entre le développement et la culture, le rapport de la Motion Picture Association of America (MPAA) au sujet des marchés notoires en termes de piratage numérique et physique, le rapport sur l’égalité des genres et le secteur culturel, ainsi que le rapport sur la contribution des industries créatives dans l’économie européenne. [less ▲]

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See detailIllustration du rôle de la Cour constitutionnelle : si l'utilité publique n'est plus établie, les propriétaires d'un bien exproprié doivent recevoir leur bien en retour
Bouhon, Frédéric ULg

E-print/Working paper (2014)

Les législateurs sont-ils tout puissants ? Certes ils sont à la source de l’ensemble des règles de droit dans le pays puisque ce sont eux qui adoptent les lois, les décrets et les ordonnances et que les ... [more ▼]

Les législateurs sont-ils tout puissants ? Certes ils sont à la source de l’ensemble des règles de droit dans le pays puisque ce sont eux qui adoptent les lois, les décrets et les ordonnances et que les arrêtés et règlements élaborés par les gouvernements et les administrations doivent les respecter. Mais les lois, les décrets et les ordonnances doivent aussi se conformer à des règles supérieures qui s’imposent à eux, notamment à celles qui garantissent nos droits fondamentaux, et ce sous le contrôle de la Cour constitutionnelle. Un tout récent arrêt, portant le n° 132/2014 et prononcé le 25 septembre 2014 , en fournit une illustration assez simple en matière d’expropriation. [less ▲]

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See detailCompte rendu de Baetens (Jan), Pour en finir avec la poésie dite minimaliste
Demoulin, Laurent ULg

E-print/Working paper (2014)

Il s'agit d'un compte rendu de l'ouvrage de Jan Baetens intitulé "Pour en finir avec la poésie dite minimaliste" paru sur le site Contextes à la page http://contextes.revues.org/5982.

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See detailOn the analogy of quantum wave-particle duality with bouncing droplets
Richardson, Chris D.; Schlagheck, Peter ULg; Martin, John ULg et al

E-print/Working paper (2014)

We explore the hydrodynamic analogues of quantum wave-particle duality in the context of a bouncing droplet system which we model in such a way as to promote comparisons to the de Broglie-Bohm ... [more ▼]

We explore the hydrodynamic analogues of quantum wave-particle duality in the context of a bouncing droplet system which we model in such a way as to promote comparisons to the de Broglie-Bohm interpretation of quantum mechanics. Through numerical means we obtain single-slit diffraction and double-slit interference patterns that strongly resemble those reported in experiment and that reflect a striking resemblance to quantum diffraction and interference on a phenomenological level. We, however, identify evident differences from quantum mechanics which arise from the governing equations at the fundamental level. [less ▲]

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See detailLa culture, grande absente ou objectif discret de l’agenda post-2015 ?
Vlassis, Antonios ULg

E-print/Working paper (2014)

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See detailAECG et industries culturelles: entre avancement positif et risques potentiels
Vlassis, Antonios ULg; Gagné, Gilbert

E-print/Working paper (2014)

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See detailL-surface and V-valley for optimal anisotropic 2D smoothing
Frasso, Gianluca ULg; Paul, Eilers

E-print/Working paper (2014)

We present the L-surface as an attractive generalization of the L-curve framework for the selection of the optimal smoothing parameters in two dimensional applications. It preserves the desirable features ... [more ▼]

We present the L-surface as an attractive generalization of the L-curve framework for the selection of the optimal smoothing parameters in two dimensional applications. It preserves the desirable features of its unidimensional analogous. The optimal amount of smoothing is indicated by the pair of parameters located in the point of maximum (Gaussian) curvature. Locate this point on a discrete parametric surface can be not straightforward. We introduce the V-valley as a simplified selection criterion based on distance minimization. [less ▲]

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See detailRéveillez-vous, le monde vous attend…
Gerkens, Jean-François ULg; Faymonville, Marie-Elisabeth ULg; Destiné, Jacques ULg et al

E-print/Working paper (2014)

Par-delà le brouillard des temps présents, un message d’optimisme, de volontarisme, de foi en l’avenir et en la vie, conduisant à sept principes, ou suggestions d’action, faciles à mettre en œuvre.

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See detailEstimating the out-of-sample predictive ability of trading rules: a robust bootstrap approach
Hambuckers, julien ULg; Heuchenne, Cédric ULg

E-print/Working paper (2014)

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being ... [more ▼]

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being rarely available. We argue that this method makes a poor use of the available information and creates data mining possibilities. Instead, we introduce an alternative bootstrap approach, based on the .632 bootstrap principle. This method enables to build in-sample and out-of-sample bootstrap data sets that do not overlap and exhibit the same time dependencies. We illustrate our methodology on IBM and Microsoft daily stock prices, where we compare 11 trading rules specifications. For the data sets considered, two different filter rule specifications have the highest out-of-sample mean excess returns. However, all tested rules cannot beat a simple buy-and-hold strategy when trading at a daily frequency. [less ▲]

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See detailEmbargo russe sur les aliments européens : l'Europe doit montrer l'exemple
Habran, Maxime ULg

E-print/Working paper (2014)

Cette note a pour but d’apporter des éclaircissements sur les mesures en matière de politique agricole commune prises par l’Union européenne

Detailed reference viewed: 158 (10 ULg)