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See detailSuccess SMB:Leadership And Multidimensional Management. An exploratory Study.
Robert, Jocelyne ULg; Renerken, Alexandre

E-print/Working paper (2016)

Some small and medium-sized businesses achieve incredible success: their financial indicators increase and their employment rate rises for several years without failing. How are these businesses lead? How ... [more ▼]

Some small and medium-sized businesses achieve incredible success: their financial indicators increase and their employment rate rises for several years without failing. How are these businesses lead? How is their leadership perceived? On which values do they rely? How can their strategy be described? What is their human resources policy? These are among the many questions we will attempt to examine. Indeed, one can be intrigued by the success of such businesses, as keeping afloat is not always easy. The very competitive environment in which these enterprises evolve can cause them to lose everything they had gathered in just a single day. In our challenging socio-economical context, where financial success remains fragile and larger companies are forced to lay off parts of their workforce, small and mediumsized businesses are a significant source of employment. They are more and more involved in the economic revival. It is therefore not surprising that many studies have examined the questions of business growth, performances or efficiency (Lescure, 1991 ; St Pierre, Janssen, Julien, Therrien, 2005 ; Colot, 2008 ; Witmeur, 2008a). The success of a company rests on many factors. Among these, leadership seems fundamental but is actually far from alone; other elements play their part, such as strategic orientation and partnerships. In order to understand these exceptional cases, we must consider a whole series of factors. Nowadays, when mention is made of a situation of growth, one can be tempted to visualize a fierce race driven only by financial results. As we will observe, this theory needs to be reviewed. Among the companies that have been interviewed, the ones which have the most significant growth are those that grant much importance to the human and relational factors. They organize the various facets of business management according to their specific situation. Situations are complex and, to a certain extent, different from one another. Our purpose was precisely to understand this complexity. [less ▲]

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See detailLe législateur wallon sommé de revoir le découpage des circonscriptions électorales
Bouhon, Frédéric ULg

E-print/Working paper (2016)

Le caractère proportionnel de notre système électoral n’est pas un vain mot et ne peut être contourné. C’est ce que viennent de rappeler deux arrêts, le premier, prononcé par le Conseil d’État, datant du ... [more ▼]

Le caractère proportionnel de notre système électoral n’est pas un vain mot et ne peut être contourné. C’est ce que viennent de rappeler deux arrêts, le premier, prononcé par le Conseil d’État, datant du 20 novembre 2014 (n° 229.252) , le second, rendu par la Cour constitutionnelle le 26 novembre 2015 (n° 169/2015) . Le Parlement wallon doit revoir la carte électorale en vue des prochaines élections. [less ▲]

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See detailCore Content Classification in General Practice Family medicine (3CGP) The Q-Codes user guide
Jamoulle, Marc ULg

E-print/Working paper (2016)

user guide and general explanation pages for the Q-codes, a classification of managerial issues in General Practice / Family Medicine

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See detailL’aménagement forestier au Congo engendre-t-il plus de déforestation ?
Karsenty, Alain; Cerutti, P.; Doucet, Jean-Louis ULg et al

E-print/Working paper (2016)

Un article publié dans Land Use Policy début 2016 arrive à la conclusion a priori étonnante que la déforestation serait, au Congo, plus élevée dans les concessions forestières avec des plans d’aménagement ... [more ▼]

Un article publié dans Land Use Policy début 2016 arrive à la conclusion a priori étonnante que la déforestation serait, au Congo, plus élevée dans les concessions forestières avec des plans d’aménagement que dans celles qui n’en ont pas. L’analyse d’évaluation d’impact qui a conduit ces chercheurs à un tel résultat se base sur un appariement de parcelles sélectionnées aléatoirement dans des concessions avec et sans plans d’aménagement. Ces chercheurs indiquent que le réseau de routes forestières plus développé dans les concessions aménagées serait un des facteurs explicatifs. L’autre facteur serait le développement local lié aux cahiers des charges des plans d’aménagement, lequel conduirait à une augmentation de la population dans ces concessions et à une déforestation accrue. Notre groupe d’une vingtaine de chercheurs connaissant bien la problématique de l’aménagement forestier en Afrique centrale s’est penché à son tour sur cette question et a analysé la déforestation au niveau des concessions sur le même intervalle de temps. Nos résultats montrent, cette fois, que la déforestation est moins importante dans les concessions avec un plan d’aménagement que dans les autres. Et si l’on compare à production égale la déforestation dans des concessions avec et sans plan d’aménagement, il apparaît que les UFA aménagées sont environ deux fois plus « efficaces », c’est-à-dire qu’on observe deux fois moins de perte de couvert forestier par mètre-cube produit. Nous en concluons qu’il est nécessaire d’analyser précisément la dynamique des différents facteurs de déforestation, et éviter d’imputer mécaniquement à l’aménagement forestier un rôle excessif dans l’évolution dans un sens ou dans l’autre du taux de déboisement. Enfin, toute évaluation doit rappeler que les effets de l’aménagement forestier doivent être mesurés sur le long terme : l’objectif de l’aménagement est de permettre une mise en valeur forestière durable, en conservant l’essentiel du capital productif pour éviter, autant que possible, la conversion à d’autres usages après les cycles de coupe initiaux. [less ▲]

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See detailFive years on for Fukushima's IDPs: Life with radiological risk and without a community safety net
Hasegawa, Reiko ULg

E-print/Working paper (2016)

On the fifth anniversary of the Fukushima nuclear accident, the article analyses what are at stake in the communities affected by the disaster, based on the result of the field interviews conducted in ... [more ▼]

On the fifth anniversary of the Fukushima nuclear accident, the article analyses what are at stake in the communities affected by the disaster, based on the result of the field interviews conducted in Fukushima. [less ▲]

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See detailSouthern Blues Night , Heerlen (Hollande) 19 mars 2016
Sacré, Robert ULg

E-print/Working paper (2016)

Compte rendu de la Southern Blues Night annuelle de Heerlen aux Pays Bas, avec photos

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See detailNote on the numerical solution of the scalar Helmholtz equation in a nanotorus with uniform Dirichlet boundary conditions
Nguyen, Ngoc Duy ULg; Evrard, Roger ULg; Stroscio, Michael

E-print/Working paper (2016)

This note describes the solution of the Helmholtz equation inside a nanotorus with uniform Dirichlet boundary conditions. The eigenfunction symmetry is discussed and the lower-order eigenvalues and ... [more ▼]

This note describes the solution of the Helmholtz equation inside a nanotorus with uniform Dirichlet boundary conditions. The eigenfunction symmetry is discussed and the lower-order eigenvalues and eigenfunctions are shown. The similarity with the case of a long cylinder and with that of the vibrations of a circular elastic membrane is discussed. This similarity is used to propose a classification scheme of the eigenfunctions based on three indices. [less ▲]

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See detailThe Smallest Salable Patent-Practicing Unit ('SSPPU') Experiment, General Purpose Technologies and the Coase Theorem
Petit, Nicolas ULg

E-print/Working paper (2016)

In the last years, some Standard-Setting Organizations (“SSOs”) active in wireless communications have experimented new pricing principles for standard essential patents (“SEPs”). One of those experiments ... [more ▼]

In the last years, some Standard-Setting Organizations (“SSOs”) active in wireless communications have experimented new pricing principles for standard essential patents (“SEPs”). One of those experiments is the “SSPPU” rule. Under SSPPU, the licensing rates paid to owners of SEPs for the use of their technology shall reflect the “value that the functionality of the claimed invention or inventive feature…contributes to the value of the relevant functionality of the smallest saleable Compliant Implementation that practices the Essential Patent Claim”. This paper reviews the SSPPU experiment through the lenses of the Coase theorem. It finds that SSPPU interferes with the efficient operation of the price system, and is likely to reduce investment in socially beneficial activities, including in General Purpose Technologies (“GPTs”) which are key drivers of economic growth. [less ▲]

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See detailLa diversité des expressions culturelles au tourbillon du numérique
Vlassis, Antonios ULg

E-print/Working paper (2016)

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See detailSome characterizations about Generalized Hölder-Zygmund Spaces Λ_{σ,N}^{α}(R^d)
Kreit, Damien ULg; Nicolay, Samuel ULg

E-print/Working paper (2016)

Generalized Hölder-Zygmund spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ were recently introduced and are based on a generalization of Besov spaces. Under some conditions, generalized Hölder-Zygmund and ... [more ▼]

Generalized Hölder-Zygmund spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ were recently introduced and are based on a generalization of Besov spaces. Under some conditions, generalized Hölder-Zygmund and Besov spaces are equal. It has been proved that most properties of classical Hölder-Zygmund spaces are held for spaces $\Lambda^{\sigma,\alpha}(\R^{d})$, which constitute a particular case of spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ with $N_{j}=2^{j}$. The goal of the present document is to prove that most of these properties are kept for $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ spaces. [less ▲]

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Peer Reviewed
See detailA Comparison of Departure Time of Day Formulations
Lurkin, Virginie ULg; Garrow, Laurie; Higgins, Matthew et al

E-print/Working paper (2016)

Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been ... [more ▼]

Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been used to model departure time of day preferences. The first is a discrete formulation that uses indicator variables to represent the hour of departure. The next two methods are based on a continuous formulation that uses a series of sine and cosine functions. One assumes departure time preferences over a 24-hour cycle and the other uses shorter cycle lengths that account for fewer departures during certain hours of the day. We compare models using itineraries in the Continental U.S. that are separated by two time zones. Although the discrete formulation fits the data better, the two continuous time of day formulations are preferred as they provide more intuitive predictions and require fewer parameters. Results between the two continuous time of day formulations are similar but differ in how strongly they weight itineraries that depart very early or very late in the day. Based on empirical results, we recommend testing both 24-hour and less than 24-hour cycle lengths for a particular dataset. [less ▲]

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See detailContinuous Departure Time of Day Preferences for Continental U.S. Airline Markets Segmented by Distance, Direction of Travel, Number of Time Zones, Day of Week and Itinerary Type
Lurkin, Virginie ULg; Garrow, Laurie; Higgins, Matthew et al

E-print/Working paper (2016)

Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice model ... [more ▼]

Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice model using database of more than 3 million tickets for Continental U.S. markets provided by the Airlines Reporting Corporation that accounted for price endogeneity. The size and comprehensiveness of our database allowed us to estimate highly refined continuous departure time of day preference curves that account for distance, direction of travel, the number of time zones traversed, departure day of week and itinerary type (outbound, inbound or one-way). This paper and accompanying Excel spreadsheet located at http://garrowlab.ce.gatech.edu contain the results of all model coefficients (including the 1260 time of day parameters) and summarize results in a series of ten figures. These highly-refined time of day preference curves can be used by airlines, researchers, and government organizations in the evaluation of demand-management and other policies. [less ▲]

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See detailPolitique de la Ville : Dynamisation des coeurs de ville
Bastin, Florine ULg; Lacroix, Gilles; May, Xavier et al

E-print/Working paper (2016)

La régionalisation de la Politique Fédérale des Grandes Villes, suite à la sixième réforme de l’Etat, fut une opportunité de s’interroger sur les objectifs et l’organisation d’une Politique de la Ville en ... [more ▼]

La régionalisation de la Politique Fédérale des Grandes Villes, suite à la sixième réforme de l’Etat, fut une opportunité de s’interroger sur les objectifs et l’organisation d’une Politique de la Ville en Wallonie. Dans ce cadre, la note de recherche CPDT n°63 « Politique de la ville. Dynamisation des cœurs de ville » répond à la volonté du Gouvernement wallon de se doter d’une vision territoriale stratégique sur le long terme et est un premier pas vers la mise en place d’une politique de la ville intégrée en Wallonie. Cette note fait le point sur, d’une part, les différentes politiques et outils relatifs à la restructuration et à la dynamisation des tissus urbains, au sens large, établis au niveau régional, fédéral et européen et, d’autre part, les propositions et recommandations relatives à l’évolution du cadre actuel. Cette réflexion s’adresse évidemment aux acteurs concernés par les enjeux de gouvernance urbaine : les décideurs politiques, les villes et les communes mais concerne aussi le citoyen. [less ▲]

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See detailStructure et négativité dans la Préface de 1961 à L'Histoire de la folie
Oulc'hen, Hervé ULg

E-print/Working paper (2016)

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Peer Reviewed
See detailHistoires de rayons verts : phénomène physique, critique de cinéma, spectateurs mélancoliques
Barbion, Sébastien ULg

E-print/Working paper (2016)

En s’appuyant sur la physique, un roman de Jules Verne et un film de Rohmer, ce texte déplie les différents aspects théoriques et pratiques contenus dans le concept de rayon vert : un type de perception ... [more ▼]

En s’appuyant sur la physique, un roman de Jules Verne et un film de Rohmer, ce texte déplie les différents aspects théoriques et pratiques contenus dans le concept de rayon vert : un type de perception, une manière de concevoir la critique de cinéma, une expérience de spectateur. [less ▲]

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See detailRésumé de la thèse: Rôle du climat et de la compétition interspécifique dans la limitation de l'aire d'invasion d'Ambrosia artemisiifolia L. en Europe de l'Ouest
Ortmans, William ULg

E-print/Working paper (2016)

The invasion continuum is classically described from a temporal point of view, where a species overcomes a defined number of barriers linked to the environment. First, an exotic species has to get through ... [more ▼]

The invasion continuum is classically described from a temporal point of view, where a species overcomes a defined number of barriers linked to the environment. First, an exotic species has to get through the geographical barrier, in order to be introduced in the new area. When introduced, the species has to face the new environmental conditions and survive to start the naturalization phase. When the environmental barrier is overcome, i.e. when the species is able to reproduce and its populations are self-sufficient, it has to overcome the dispersal barrier to spread in the ecosystem and finally become invasive. Within a given continent, a species could have overcome a variable number of barriers depending on the considered area. One can observe depending on the geographical zone some non-naturalized populations that cannot survive without a human introduction of new propagules, some naturalized populations that are not invasive yet, and some invasive populations. This geographical variation may be the result of a variation of the environmental conditions at the continental scale. The common ragweed (Ambrosia artemisiifolia L.) invasion in Western Europe is a good opportunity to study this aspect of the invasion biology. The invasion history and the species distribution are well documented, and highlight a geographical variation of the invasion dynamic. This is particularly clear in Western Europe, where lies a contrast between the highly invaded zone of the South of France, and the areas that are farther north (e.g. the North of France, Belgium, and the Netherlands). In this work, the general objective was to determine if this situation will remain stable or not, by assessing if the local climate and the interspecific competition were liming the species expansion northward. In order to answer this general objective, four different questions were asked: 1) Is the climate and/or the interspecific competition causing a plant performance variation within the different areas of the introduced range in Western Europe?; 2) Is the local climate allowing the establishment and the reproduction of newly introduced populations north to the current invaded range, in an agricultural habitat?; 3) What is the role of the morphological variability of the seeds in the invasion of areas experiencing rigorous climatic conditions?; and 4) What is the role of the priority effect in the species establishment? The results showed that once introduced in an agricultural habitat outside the current invaded range, the species was able to establish self-sustaining populations. On average, each plant produced a number of offspring equal to 273 ± 18.4 (mean ± standard error). In ruderal habitats, populations already exist in Belgium and in the South of The Netherlands, and are able to produce a high quantity of seeds: on average, measured plants carried 222± 32.0 seeds. The measured plant performances were similar to those measured within the invaded area. No limit to the colonization of the area beyond the current invaded range was found in this study. The local climate and the interspecific competition did not appear to limit the naturalization of the species in the studied area, which is located north to the current invaded range, in agricultural or ruderal situations. This work highlighted the obsolescence of the species status in Belgium, and illustrated the dynamic aspect of the invasion. The results showed the importance of the temporality in the colonization of disturbed habitats. When the species started its development a few weeks before the rest of the community, its performance was decupled, and this increase was higher than the one other Asteraceae ruderals species showed in the same position: its above ground biomass was 30.5 ± 1.94 times higher, and the number of flower heads 570 ± 160 times more important.. The high variability of the species observed all along this work is probably playing an important role in the invasion success. The high variability of the seeds morphology can widen the range of environmental conditions of the habitats the species is able to colonize. In addition, the plasticity of the morphological traits of the plant in response to climate and competition appeared to allow the species to maintain a good performance, even in stressful conditions. The results of this work suggest an invasion potential north to the current invaded area in Western Europe. In this uncertain situation, it appears critical to implement structure allowing the early detection of the species. This early detection may allow the eradication of the species before that the invasion was as problematic as in France. Sensitization campaigns of the agricultural sector should be encouraged in Belgium in order to avoid new occurrence of the species in field to be overlooked. These measures could allow the dispersion to remain a limiting factor for the invasion process in Belgium. [less ▲]

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See detailHedge fund styles and macroeconomic uncertainty
Platania, Federico ULg; Lambert, Marie ULg

E-print/Working paper (2016)

This paper examines the dynamic trading strategies implemented by hedge fund managers using a Kalman filter of hedge fund betas across styles. We further investigate the risk drivers of dynamic trades ... [more ▼]

This paper examines the dynamic trading strategies implemented by hedge fund managers using a Kalman filter of hedge fund betas across styles. We further investigate the risk drivers of dynamic trades, examining which conditioning/macroeconomic variables strongly lead the time variation in fund trades. We report the significance of macroeconomic factors such as interest rates, dividend yield, GDP growth and US unemployment. We show that hedge fund managers do control the intensity of their exposures according to economic uncertainty and that differences between up- and down-market regimes can be observed. Commonly, Hedge funds tend to dislike high-dividend paying stocks. Besides, all hedge fund styles are shown to display pro-cyclical exposures towards directional equity factors as well as credit and liquidity risks. Small growth stocks, however, are revealed to be crisis investments whose allocation increases with unemployment, inflation or volatility. As volatility increases, the value of growth options embedded into growth stocks indeed increases. Growth stocks are shown to hedge market reversals and volatility. The outperformance of growth companies in recessions might also relate to their cost flexibility. Allocation to small stocks embed strong micro risks and might also constitute a hedge in economic slowdowns. This might explain why some funds with such a particular investment focus appear to be countercyclical. [less ▲]

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See detailSéminaire "Storytelling": note d'intention
Claisse, Frédéric ULg; Huppe, Justine ULg

E-print/Working paper (2016)

A l'origine, cette note constitue un document de travail à destination des étudiant-e-s de Masters en langues et lettres françaises romanes, à finalité approfondie, qui ont choisi le module « Storytelling ... [more ▼]

A l'origine, cette note constitue un document de travail à destination des étudiant-e-s de Masters en langues et lettres françaises romanes, à finalité approfondie, qui ont choisi le module « Storytelling » dans le cadre du séminaire de littérature (XIXe-XXIe) : Histoire, société, institutions, discours (2e quadrimestre, année 2015-2016). Elle reprend les hypothèses et grandes lignes du projet de recherche (FRS-FNRS) "Storyfic", qui vise à évaluer l'impact du storytelling sur l'écriture de fiction contemporaine. [less ▲]

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See detailAnalyse comparative des résultats économiques de la production rizicole dans les pays de la CEPGL
Furaha Mirindi, Germaine ULg; Mastaki, Jean-Luc; Lebailly, Philippe ULg

E-print/Working paper (2016)

Cet article fait une analyse comparative des résultats économiques de la production rizicole durant la saison B 2014 dans les trois pays de la CEPGL qui sont la République Démocratique du Congo, le Rwanda ... [more ▼]

Cet article fait une analyse comparative des résultats économiques de la production rizicole durant la saison B 2014 dans les trois pays de la CEPGL qui sont la République Démocratique du Congo, le Rwanda et le Burundi. L’approche comparative permet de trouver les explications des différences des résultats en partie dans les politiques mises en oeuvre dans chaque pays. Les enquêtes ont été menées dans la plaine de la Ruzizi partagée entre les trois pays auprès de 240 producteurs du riz choisi à partir de la méthode des quotas sur la base d'une stratification des exploitations rizicoles. Dans le site congolais (où il est plus difficile d’accéder aux intrants et crédits), les coûts de production d’1kg de paddy sont les plus élevés avec une fonction de production y=0,034x+0,053z+0,422 et le rendement le plus bas (2698kgs). Par contre, dans les sites burundais et rwandais où l’Etat intervient dans l’approvisionnement en intrants et particulièrement dans le site rwandais, l’accès aux crédits, les fonctions de production sont respectivement de y=0,024x+0,031z+0,297 et y=0,017x+0,023z+0,269 avec des rendements de 3962kgs et 5339kgs dans le même ordre. Les coûts de production supportés sur un hectare rizicole ou encore pour la production d’une tonne de paddy varient selon le pays car ils dépendent de la valeur des intrants utilisés et des autres charges de structures. Ils varient ainsi de 1139,4USD à 1354,5USD/ ha et de 269 à 422USD/tonne. [less ▲]

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See detailNonparametric control charts: economic statistical design
Marcos Alvarez, Alejandro ULg; Heuchenne, Cédric ULg; Faraz, Alireza ULg

E-print/Working paper (2016)

This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested location ... [more ▼]

This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested location parameter, they do not use either any parametric distribution for the quality characteristic or any information about the possible involved parameters, neither in the in-control nor in the out-of-control state. This is made possible by minimizing a cost function specified independently of these quantities. Unlike the ESD for the $\overline{x}$ chart, the resulting charts designs are robust to changes of the distributions of the observations (in control or out of control), provide reliable statistical guarantees when the $\overline{x}$ chart ESD does not and stay competitive even when the strong assumptions of the $\overline{x}$ chart ESD are fully satisfied. These new techniques can therefore be applied to a definitely wider class of problems and their designs may stay constant over time without losing performance. [less ▲]

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See detailOnline Learning for Strong Branching Approximation in Branch-and-Bound
Marcos Alvarez, Alejandro ULg; Wehenkel, Louis ULg; Louveaux, Quentin ULg

E-print/Working paper (2016)

We present an online learning approach to variable branching in branch-and-bound for mixed-integer linear problems. Our approach consists in learning strong branching scores in an online fashion and in ... [more ▼]

We present an online learning approach to variable branching in branch-and-bound for mixed-integer linear problems. Our approach consists in learning strong branching scores in an online fashion and in using them to take branching decisions. More specifically, numerical scores are used to rank the branching candidates. If, for a given variable, the learned approximation is deemed reliable, then the score for that variable is computed thanks to the learned function. If the approximation is not reliable yet, the real strong branching score is used instead. The scores that are computed through the real strong branching procedure are fed to the online learning algorithm in order to improve the approximated function. The experiments show promising results. [less ▲]

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See detailOn the processing of red pigment by late mousterian Neanderthals in Ormesson, Seine-et-Marne, France, 47000 years ago
Salomon, Hélène ULg; Bodu, Pierre; Geurten, Stéphanie et al

E-print/Working paper (2016)

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See detailBispecial factors in the Brun S-adic system
Labbé, Sébastien ULg; Leroy, Julien ULg

E-print/Working paper (2016)

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See detailA stroll along the gamma
Arras, Benjamin ULg; Swan, Yvik ULg

E-print/Working paper (2016)

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Peer Reviewed
See detailFundamentals for an International Typology of Social Enterprise Models
Defourny, Jacques ULg; Nyssens, Marthe

E-print/Working paper (2016)

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See detailRossano Rosi, "Hanska": un roman en "feuilleté"
Demoulin, Laurent ULg

E-print/Working paper (2016)

Compte rendu du beau roman de Rossano Rosi "Hanska"

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See detailMarket efficiency and hedge fund trading strategies
Platania, Federico ULg; Lambert, Marie ULg; Papageorgiou, Nicolas

E-print/Working paper (2016)

Stock and option markets can at times reflect differing information. We identify three reasons for the presence of these periods of "disagreement" between the cash and derivatives markets: 1) high ... [more ▼]

Stock and option markets can at times reflect differing information. We identify three reasons for the presence of these periods of "disagreement" between the cash and derivatives markets: 1) high volatility and noise trading; 2) high level of risk aversion; 3) speculation versus hedging trades. This paper investigates the role that hedge funds, a proxy for sophisticated investors, play in the price discovery process between stock and option markets and the disagreement/agreement periods. We observe that a disparity in information between the two markets is often associated with deleveraging in directional exposures and reversal strategies. Posterior to the event, active tactical asset allocation in small and value factor investing takes place. We investigate four specific macro events which resulted in significant rebalancing by hedge fund manegers: the Thai Baht depreciation, the Dot-com bubble, the credit crunch and the Nasdaq correction. [less ▲]

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See detailHST-Juno synergistic approach of Jupiter's magnetosphere and ultraviolet auroras
Grodent, Denis ULg; Bonfond, Bertrand ULg; Gérard, Jean-Claude ULg et al

E-print/Working paper (2016)

Jupiter's system is not only fundamental to our understanding of the solar system but also of planetary systems around other stars as well as more distant astrophysical bodies, not accessible to a ... [more ▼]

Jupiter's system is not only fundamental to our understanding of the solar system but also of planetary systems around other stars as well as more distant astrophysical bodies, not accessible to a detailed investigation. Fully exploiting any rare opportunity to explore the Jovian system through synergistic observations is thus critical, as it will impact significantly across wider astronomical studies. Such an exceptional opportunity will occur in Cycle 24, when the NASA Juno spacecraft will achieve its prime mission around Jupiter. Since Juno will literally fly through the auroral acceleration regions, the combination of HST auroral observations with Juno in situ measurements will allow us to finally unravel the origins and consequences of Jupiter's powerful and highly variable ultraviolet auroras. This occasion has never occurred before and is unlikely to ever repeat. Juno will address key scientific issues related to unexplored regions of the Jovian magnetosphere. The auroral signatures associated with these magnetospheric processes will be precisely observed with STIS and COS. This program responds to the UV initiative and is only possible during Cycle 24. Indeed, HST is the only observatory capable of making these high spatial and temporal resolution FUV observations during the Juno mission. This ambitious campaign will yield high-impact results and significantly augment the science return of the NASA Juno mission. [less ▲]

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See detailFisheries reforms and right-based fisheries: insights from community fisheries across Cambodia
Chap, Sreyphea; Touch, Panha; Diepart, Jean-Christophe ULg

E-print/Working paper (2016)

The working paper uses a right-based approach to examine recent wave of reforms in the Cambodian fisheries sector and what these reforms mean for community fisheries management.

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See detailALPI project - Green Incentives : Belgian and European Aspects
Bourgeois, Marc ULg; Vanrykel, Fanny ULg; Defoy, Xavier ULg

E-print/Working paper (2016)

Finance is one of the main critical issues for the development of a low-carbon society especially during times of economic recession. Closing this green investment gap will require policy intervention ... [more ▼]

Finance is one of the main critical issues for the development of a low-carbon society especially during times of economic recession. Closing this green investment gap will require policy intervention. The ALPI project will concentrate on promoting relevant ins truments to accelerate the transition towards a low-carbon society by demonstrating the performance and impact of policy instruments on economic, government budget and environmental aspects. [less ▲]

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See detailFeasibility-oriented Branching Strategies for Global Optimization
Gerard, Damien ULg; Köppe, Matthias; Louveaux, Quentin ULg

E-print/Working paper (2016)

We study the spatial Brand-and-Bound algorithm for the global optimization of nonlinear problems. In particular we are interested in a method to find quickly good feasible solutions. Most spatial Branch ... [more ▼]

We study the spatial Brand-and-Bound algorithm for the global optimization of nonlinear problems. In particular we are interested in a method to find quickly good feasible solutions. Most spatial Branch-and-Bound-based solvers use a non global solver at a few nodes to try to find better incumbents. We show that it is possible to improve the branching rules and the node priority by exploiting the solutions from the non global solver. We also propose several smart adaptive strategies to choose when to run the non global solver. We show that despite the time spent in solving many more NLP problems in the nodes, the new strategies enable the algorithm to find the first good incumbents faster and to prove the global optimality faster. Numerous easy, medium size as well as hard NLP instances from the Coconut library are benchmarked. All experiments are run using the open source solver Couenne. [less ▲]

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See detailChinese State Capitalism and Western Antitrust Policy
Petit, Nicolas ULg

E-print/Working paper (2016)

Enthused by China’s conversion to the free market system in 1978 and its adoption of Western-style market institutions, the world has spent the last few decades turning a blind eye to China’s real ... [more ▼]

Enthused by China’s conversion to the free market system in 1978 and its adoption of Western-style market institutions, the world has spent the last few decades turning a blind eye to China’s real “governance” problem: that a shadow Party-State system permeates all branches of the economy. Whatever Washington-consensus style institutions are put in place, whatever State Owned Enterprise (“SOE”) reform is introduced, corporate and market governance occur under the rule of the Chinese Communist Party (“CCP”). And the CCP’s guidebook is the Leninist command that the whole of society shall be run as “single country-wide State syndicate”. This paper contends that China’s syndicated economic organization is akin to a “supertrust”, and that this creates conditions that are conducive to antitrust problems to which the Western world must awaken. In this context, this paper advances that the antitrust regulators of North America, Europe and elsewhere should take two simple, pragmatic steps under merger control and antitrust rules. In merger review, antitrust agencies should treat all SOEs and Privately Owned Enterprises (POEs) with a CCP cell as one unitary group and undertake a thorough competitive assessment of transactions on this basis. In addition, antitrust cases involving Chinese firms should be investigated on the default assumption that there is an underlying coordination scheme among them. [less ▲]

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See detailSize and Value Matter But Not the Way You Thought
Lambert, Marie ULg; Fays, Boris ULg; Hübner, Georges ULg

E-print/Working paper (2016)

We propose a simple but fundamental methodological change to Fama and French (1993) factor construction procedure. Consistent with Lambert and Hübner (2013) sequential sorting procedure to classify stocks ... [more ▼]

We propose a simple but fundamental methodological change to Fama and French (1993) factor construction procedure. Consistent with Lambert and Hübner (2013) sequential sorting procedure to classify stocks, our methodology controls ex ante for pricing errors produced by multifactor models. Our size and value factors deliver less specification errors when used to price portfolios, especially regarding low size and high B/M stocks. Furthermore, this alternative framework generates much stronger “turn-of-the-year” size and “through-the-year” book-to-market effects than conventionally documented. The factors also display a slight competitive advantage on the taxonomy of low turnover market anomalies defined by Novy-Marx and Velikov (2015). [less ▲]

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Peer Reviewed
See detailIntensification of smallholder agriculture in Rwanda: scenarios and challenges towards a sustainable transformation
Musabanganji, Edouard ULg; Karangwa, Antoine; Lebailly, Philippe ULg

E-print/Working paper (2016)

This paper clarifies the path that Rwanda took in the quest for a modern, intensive, productive and market-oriented agriculture. The facts presented here have been collected by means of documentation that ... [more ▼]

This paper clarifies the path that Rwanda took in the quest for a modern, intensive, productive and market-oriented agriculture. The facts presented here have been collected by means of documentation that led to the review of different publications including published papers and government and development partners’ reports. The paper shows that an adequate policy and institutional environment has been created by various socio-economic, institutional and agriculture-led reforms launched since the early 2000s. The literature review reveals that impressive results have been recorded in regard to smallholder agriculture intensification. In addition, the theoretical model for progressive smallholder agriculture transformation helped to show that most of the smallholders grouped in cooperatives are at the 'semi-commercial smallholders' stage while only a few are at the 'commercial smallholders' and 'advanced farmers' stages. This study also examines various challenges that hamper the sustainable intensification of smallholder agriculture at both institutional, community and smallholder level. It suggests some policy actions to be put forward by the government and other agriculture sector development partners to address those challenges. [less ▲]

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See detailAlmost sure approximations in H older norms of a general stochastic process de ned by a Young integral
Ayache, Antoine; Esser, Céline ULg; Qidi, Peng

E-print/Working paper (2016)

We focus on a stochastic process $\{Y(t)\}_{t\in [0,v]}$ defined by a pathwise Young integral of a general form. Thanks to the Haar basis, we connect the classical method of approximation of $\{Y(t)\}_{t ... [more ▼]

We focus on a stochastic process $\{Y(t)\}_{t\in [0,v]}$ defined by a pathwise Young integral of a general form. Thanks to the Haar basis, we connect the classical method of approximation of $\{Y(t)\}_{t\in [0,v]}$ through Euler scheme and Riemann-Stieltjes sums with a new approach consisting in the use of an appropriate series representation of $\{Y(t)\}_{t\in [0,v]}$. This representation is obtained through a general compactly supported orthonormal wavelet basis. An advantage offered by the new approach with respect to the classical one is that a better almost sure rate of convergence in H\"older norms can be derived, under a general Gaussian condition. Also, this improved rate turns out to be optimal in some situations; typically, when the integrator associated to $\{Y(t)\}_{t\in [0,v]}$ is a fractional Brownian motion of an arbitrary Hurst parameter, and the integrand is a deterministic nowhere vanishing function with an invariant H\"older regularity large enough. [less ▲]

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See detailTargeted Advertising and Consumer Information
Broos, Sébastien ULg

E-print/Working paper (2016)

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See detailLong-term care social insurance. How to avoid big losses?
Klimaviciute, Justina ULg; Pestieau, Pierre ULg

E-print/Working paper (2016)

Long-term care (LTC) needs are expected to rapidly increase in the next decades and at the same time the main provider of LTC, namely the family is stalling. This calls for more involvement of the state ... [more ▼]

Long-term care (LTC) needs are expected to rapidly increase in the next decades and at the same time the main provider of LTC, namely the family is stalling. This calls for more involvement of the state that today covers less than 20% of these needs and most often in an inconsistent way. Besides the need to help the poor dependent, there is a mounting concern in the middlec lass that a number of dependent people are incurring costs that could force them to sell all their assets. In this paper we study the design of a social insurance that meets this concern. Following Arrow (1963), we suggest a policy that is characterized by complete insurance above a deductible amount. [less ▲]

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See detailBoosted Dark Matter and its implications for the features in IceCube HESE data
Bhattacharya, Atri ULg; Gandhi, Raj; Gupta, Aritra et al

E-print/Working paper (2016)

We study the implications of the premise that any new, relativistic, highly energetic neutral particle that interacts with quarks and gluons would create cascade-like events in the IceCube (IC) detector ... [more ▼]

We study the implications of the premise that any new, relativistic, highly energetic neutral particle that interacts with quarks and gluons would create cascade-like events in the IceCube (IC) detector which would be observationally indistinguishable from neutral current deep-inelastic (DIS) scattering events due to neutrinos. Consequently, one reason for deviations, breaks or excesses in the expected astrophysical power-law neutrino spectrum could be the flux of such a particle. Motivated by features in the recent 1347-day IceCube high energy starting event (HESE) data, we focus on particular boosted dark matter ($\chi$) related realizations of this premise, where $\chi$ is assumed to be much lighter than, and the result of, the slow decay of a massive scalar ($\phi $) which constitutes a major fraction of the Universe's dark matter (DM). We show that this hypothesis, coupled with a standard power-law astrophysical neutrino flux is capable of providing very good fits to the present data, along with a possible explanation of other features in the HESE sample: i.e., a) the paucity of events beyond $\sim 2$ PeV b) a spectral feature resembling a dip in the 400 TeV--1 PeV region and c) an excess in the $50-100$ TeV region. We consider two different boosted DM scenarios, and determine the allowed mass ranges and couplings for four different types of mediators (scalar, pseudoscalar, vector and axial-vector) which could connect the standard and dark sectors, imposing constraints from gamma-ray observations and collider searches. We find that the gamma-ray observations provide the most restrictive constraints, disfavouring the $1\sigma$ allowed parameter space from IC fits, while still being consistent with the $3\sigma$ allowed region. We also test our proposal and its implications against the sample of six year through-going muon track data recently released by IceCube. [less ▲]

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See detailMoral Hazard in VC Finance: More Expensive than You Thought
Lambert, Marie ULg; Tennert, Julius; Burghof, Hans-Peter

E-print/Working paper (2016)

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See detailOlder men’s labor force participation in Belgium
Jousten, Alain ULg; Lefebvre, Mathieu ULg

E-print/Working paper (2016)

We provide an overview of the institutional framework in Belgium that is of relevance for labor market participation and retirement decision at older ages. We then describe key labor market indicators ... [more ▼]

We provide an overview of the institutional framework in Belgium that is of relevance for labor market participation and retirement decision at older ages. We then describe key labor market indicators using data from the Labour Force Survey (LFS) over the period 1983-2013 and also present trends in participation in (early-) retirement routes. Next, we explore how the types of jobs in the country have changed over time, both in terms of their “quality” and the “quantity” of work involved. [less ▲]

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See detailNonlinear dynamical tunneling of optical whispering gallery modes in the presence of a Kerr nonlinearity
Shim, Jeong -Bo ULg; Schlagheck, Peter ULg; Hentschel, Martina et al

E-print/Working paper (2015)

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See detailIdentification of the concepts at stake during a consultation. Clinical exercises
Jamoulle, Marc ULg

E-print/Working paper (2015)

During a consultation between a patient and a doctor, symptoms, process and health problems are at stake and could be identified and retrieved through the use of ICPC.(refer to www.ph3c.org) Specific ... [more ▼]

During a consultation between a patient and a doctor, symptoms, process and health problems are at stake and could be identified and retrieved through the use of ICPC.(refer to www.ph3c.org) Specific training and managerial competences of the doctor could be identified and explained through the Q-Codes Together ICPC and Q-Codes form 3CGP ; Core Content Classification in General Practice/ Family Medicine The concepts identified in ICPC and Q-Codes could be useful to understand and teach the content of consultation in family medicine. [less ▲]

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See detailFestivals Acadiens et Creoles
Sacré, Robert ULg

E-print/Working paper (2015)

Comptes-rendus avec photos et liens Internet : 1) Houston et Galveston ( TX) 2) Festivals Acadiens et Créoles à Lafayette ( LA) jours 1 , 2 et 3 3) Lafayette by night

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See detailWhy Did the Industrial Revolution Start in Britain?
Van Neuss, Leif ULg

E-print/Working paper (2015)

The main goal of this paper is to provide an integrated overview of the literature devoted to identifying the causes of the British industrial revolution. Why did the industrial revolution, a fascinating ... [more ▼]

The main goal of this paper is to provide an integrated overview of the literature devoted to identifying the causes of the British industrial revolution. Why did the industrial revolution, a fascinating and multifaceted event which brought about modern economic growth, occur in eighteenth-century Britain? This question has animated a lot of discussions among scholars and is still nowadays heatedly debated in the literature. This debate is reflected in the large spectrum of theories which aim at explaining the true origins of the British industrialization. The paper first sheds light on a rising debate concerning the evolution of British incomes per capita before the British industrial revolution and the “Great Divergence”. The paper then investigates the proposed causes of the British industrialization, aggregating them into seven broad categories, i.e. (1) geography and natural resources, (2) demography, (3) agricultural progress, (4) demand-side factors, (5) trade and empire, (6) institutional and political factors, (7) science, technology, and human capital. [less ▲]

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See detailFrom 'Risk Communication' to Participatory Radiation Risk Assessment
Shirabe, Masashi; Fassert, Christine; Hasegawa, Reiko ULg

E-print/Working paper (2015)

In the aftermath of the Fukushima nuclear accident, many of the post¿disaster responses undertaken by the Japanese government sparked vivid debates and criticisms from the civil society. The article ... [more ▼]

In the aftermath of the Fukushima nuclear accident, many of the post¿disaster responses undertaken by the Japanese government sparked vivid debates and criticisms from the civil society. The article examines the post-accidental management of the authorities, with a special focus on their risk communication, and explores what went wrong in the process. It deals with the issues of risk assessment, expertise, counter-expertise, policy-makings, stakeholder participation, and trust in crisis and disaster situations. [less ▲]

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See detailLarge neighborhood search for multi-trip vehicle routing
François, Véronique ULg; Arda, Yasemin ULg; Crama, Yves ULg et al

E-print/Working paper (2015)

We consider two large neighborhood search approaches for the multi-trip vehicle routing problem, where each vehicle can perform several routes during the working shift to serve a set of customers. The ... [more ▼]

We consider two large neighborhood search approaches for the multi-trip vehicle routing problem, where each vehicle can perform several routes during the working shift to serve a set of customers. The problem specifically arises when customers are close to each other and/or when the demands are large. A common approach in the literature consists in solving this problem by mixing vehicle routing heuristics with bin packing routines to assign routes to vehicles. We compare this approach with the use of specific operators designed to tackle the routing and the assignment aspects of the problem simultaneously. We provide several best known solutions for benchmark instances. At the end of the work, we give insights about the proposed algorithm configurations by analyzing the behavior of several method components. [less ▲]

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Peer Reviewed
See detailQui ne risque rien n'a rien... Ou comment la Cour européenne des droits de l'homme incite le justiciable à éprouver la protection de ses droits fondamentaux devant son juge national
Rosoux, Géraldine ULg

E-print/Working paper (2015)

L'article analyse la décision Gherghina c. Roumanie du 9 juillet 2015, qui rejette une requête pour défaut d'épuisement des voies de recours internes.

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See detail25 novembre 2015 : cent ans de Relativité
De Rop, Yves ULg

E-print/Working paper (2015)

La théorie proposée par Einstein au début du XXe siècle porte bien mal son nom; car si, historiquement, l'accent fut mis d'abord sur la relativité de certaines notions (en particulier, la mesure de l ... [more ▼]

La théorie proposée par Einstein au début du XXe siècle porte bien mal son nom; car si, historiquement, l'accent fut mis d'abord sur la relativité de certaines notions (en particulier, la mesure de l'intervalle de temps écoulé entre deux événements donnés), on a compris par la suite qu'elle reposait plus fondamentalement sur l'existence de quantités absolues, c'est-à-dire, dont la mesure est identique pour tous les observateurs, quel que soit leur état de repos ou de mouvement. Ces quantités sont inconnues de la mécanique de Newton, laquelle ne reconnaît qu'un seul invariant : le temps. Ce texte cherche à retracer, avec un minimum de formalisme, comment s'est imposé un nouveau cadre géométrique pour la physique, dominé par cette exigence d'invariance des mesures spatio-temporelles et intégrant une description révolutionnaire de la gravitation. [less ▲]

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See detailElmore D. L'intégrale Frémeaux et Ass.
Sacré, Robert ULg

E-print/Working paper (2015)

Compte rendu Coffret 5 CDs + livret . La Wallon et le Blues , un mariage réussi

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See detailMars nighttime aurora
European Space Agency, ESA/ATG medialab; Gérard, Jean-Claude ULg; Soret, Lauriane ULg

E-print/Working paper (2015)

Press release by the European Space Agency (ESA) on the occasion of the publication in two journals of the peer-reviewed literature

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Peer Reviewed
See detailRebates and Article 102 TFEU: The European Commission's Duty to Apply the Guidance Paper
Petit, Nicolas ULg

E-print/Working paper (2015)

This paper shows that the European Union (EU) courts' case-law and general principles of EU law place the European Commission (“Commission”) under a duty to apply the Guidance Communication on Enforcement ... [more ▼]

This paper shows that the European Union (EU) courts' case-law and general principles of EU law place the European Commission (“Commission”) under a duty to apply the Guidance Communication on Enforcement Priorities (“Guidance Paper”) in abuse of dominance cases started after its adoption. This duty includes the obligation to test Article 102 TFEU cases under the As Efficient Competitor (“AEC”) framework, as set out in the 2009 Guidance Paper. The judgments handed down by the Union courts in Intel v Commission and Post Danmark II do not alter in any way the Commission’s “self binding” duty to apply the Guidance Paper. If the Commission wishes to depart from the AEC framework, it must officially withdraw its Guidance Paper. [less ▲]

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See detailLes Nouveaux Réactionnaires : mythe ou réalité ?
Durand, Pascal ULg; Sindaco, Sarah ULg; Devecchio, Alexandre

E-print/Working paper (2015)

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See detailL’accompagnement de projets d’entrepreneuriat social dans leurs phases initiales
Dufays, Frédéric ULg; Lovens, Caroline ULg; Mertens de Wilmars, Sybille ULg

E-print/Working paper (2015)

L’entrepreneuriat social connaît depuis quelques années un intérêt croissant. Mais pour les entrepreneurs sociaux, concilier les dimensions sociales et économiques demande de faire face à des défis bien ... [more ▼]

L’entrepreneuriat social connaît depuis quelques années un intérêt croissant. Mais pour les entrepreneurs sociaux, concilier les dimensions sociales et économiques demande de faire face à des défis bien spécifiques. Ne faut-il donc pas favoriser un accompagnement sur-mesure et modulable ? C’est le défi qu’a choisi de relever en Belgique francophone le programme ImpulCera en proposant aux entrepreneurs sociaux un soutien financier pour la réalisation d’une étude de faisabilité et pour le lancement de leur projet. Le présent article présente quelques résultats de l’évaluation de ce programme ainsi que les enseignements qui peuvent en être dégagés. [less ▲]

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See detailPour analyser la qualité des médicaments
Ziemons, Eric ULg

E-print/Working paper (2015)

Technique permettant de décortiquer les caractéristiques chimiques et physiques des molécules, la spectroscopie vibrationnelle est précieuse dans le domaine pharmaceutique. Les chercheurs du laboratoire ... [more ▼]

Technique permettant de décortiquer les caractéristiques chimiques et physiques des molécules, la spectroscopie vibrationnelle est précieuse dans le domaine pharmaceutique. Les chercheurs du laboratoire de Chimie Analytique de l’Université de Liège, spécialistes dans ce domaine de recherche, collaborent régulièrement avec des entreprises pharmaceutiques pour contrôler leurs matières premières, produits finis et procédés. [less ▲]

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See detailLe syndrome coup de sang
Courouce-Malblanc, Anne; Daix, Charlène; Ferry, Bénédicte et al

E-print/Working paper (2015)

Le coup de sang est un terme utilisé pour nommer une myopathie brutale consécutive à un exercice qui se manifeste cliniquement par des crampes douloureuses et une urine de couleur anormalement foncée du ... [more ▼]

Le coup de sang est un terme utilisé pour nommer une myopathie brutale consécutive à un exercice qui se manifeste cliniquement par des crampes douloureuses et une urine de couleur anormalement foncée du fait de l’élimination de la myoglobine des cellules musculaires détruites (myoglobinurie). [less ▲]

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See detailCeci n’est pas un conseil !
Choffray, Jean-Marie ULg

E-print/Working paper (2015)

La « Grande Récession de 2008 » a un mérite. Un seul ! Elle a rendu public le fait que personne ne savait exactement ce qui s’était passé, ni ce qui se passait. Pourquoi une telle crise de confiance avait ... [more ▼]

La « Grande Récession de 2008 » a un mérite. Un seul ! Elle a rendu public le fait que personne ne savait exactement ce qui s’était passé, ni ce qui se passait. Pourquoi une telle crise de confiance avait-elle vu le jour ? Quelles en seraient les conséquences ? Toutes et tous se sont trompés, y compris les meilleurs. Même celles et ceux qui étaient convaincus d’avoir raison ! Plus que jamais, l’incertitude, la saine et souveraine incertitude, garantit la liberté de l’investisseur... et du professeur ! [less ▲]

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See detailMarkets flash graphs
Choffray, Jean-Marie ULg

E-print/Working paper (2015)

A graph is worth a hundred words... A good graph may suggest some new heuristics. And…, a series of excellent graphs may provide the backbone of a theory! The goal of this paper is to share a set of ... [more ▼]

A graph is worth a hundred words... A good graph may suggest some new heuristics. And…, a series of excellent graphs may provide the backbone of a theory! The goal of this paper is to share a set of graphs from multiple sources that offer as many flashes on current and past market conditions. Inevitably, these graphs reflect my own biases and questionings. They are not meant to induce any action aside, maybe, from their integration in a personal Information System. The Great Recession of 2008, whose consequences are still unfolding, has been for each of us a powerful invitation to modesty. We live in a world where improbable, unthinkable and impossible events happen every day... More than ever, it’s time to sit down, shut up, watch out, build graphs, and think… hard! [less ▲]

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See detailInstitutional repositories: it’s a matter of sticks and carrots
Rentier, Bernard ULg

E-print/Working paper (2015)

Detailed reference viewed: 257 (11 ULg)
See detailObserving the emergence of chaos in a many-particle quantum system
Tomkovic, Jiri; Muessel, Wolfgang; Strobel, Helmut et al

E-print/Working paper (2015)

Accessing the connection between classical chaos and quantum many-body systems has been a long-standing experimental challenge. Here, we investigate the onset of chaos in periodically driven two-component ... [more ▼]

Accessing the connection between classical chaos and quantum many-body systems has been a long-standing experimental challenge. Here, we investigate the onset of chaos in periodically driven two-component Bose-Einstein condensates, whose small quantum uncertainties allow for exploring the phase space with high resolution. By analyzing the uncertainties of time-evolved many-body states, we find signatures of elliptic and hyperbolic periodic orbits generated according to the Poincar\'e-Birkhoff theorem, and the formation of a chaotic region at increasing driving strengths. The employed fluctuation analysis allows for probing the phase-space structure by use of only short-time quantum dynamics. [less ▲]

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See detailWill Big Data Deliver its Promised Productivity Growth?
Artige, Lionel ULg

E-print/Working paper (2015)

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See detailBlues et Wallon - Elmore D, l'intégrale cåzî complète en cinq CDs
Sacré, Robert ULg

E-print/Working paper (2015)

Analyse d'une anthologie de 5 Cds représentant l'intégrale" cåzî "complète des enregsitrements d'Elmore D ( Prof. Daniel Droixhe) pour la compagnie française FREMEAUX et ASS.

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See detailDans le dédale des Musiques Africaines-Américaines
Sacré, Robert ULg

E-print/Working paper (2015)

Notes du cours " Histoire des Musiques Africaines Américaines, des origines à nos jours" (remise à jour 2015) - cours dispensé depuis 1984

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See detailLe Gevarenwinkel Festival de Herselt
Sacré, Robert ULg

E-print/Working paper (2015)

Compte rendu du Festival Gevarenwinkel à HERSELT les 28 et 29 août 2015 , avec photos

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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)

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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)

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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)

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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)

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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 ▲]

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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)

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See detailQue produit l'entreprise d'économie sociale
Mertens de Wilmars, Sybille ULg; Marée, Michel ULg

E-print/Working paper (2015)

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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

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See detailThe Social Responsability of Football Clubs: the "Shared Value" as a Process of Value Creation?
Delhez, Gautier; Robert, Jocelyne ULg

E-print/Working paper (2015)

In the literature, CSR has been studied as a mean to reconnect sport organizations and society. Nevertheless, little attention has been paid to Porter and Kramer’s « shared value ». Therefore, after ... [more ▼]

In the literature, CSR has been studied as a mean to reconnect sport organizations and society. Nevertheless, little attention has been paid to Porter and Kramer’s « shared value ». Therefore, after presenting the management of sport organisations as well as CSR, this article will be drawn on Crane et al.’s six characteristics of CSR and on Porter and Kramer’s concept to assess whether professional football clubs in Belgium are developing CSR or not. Then, we will assess, in this qualitative and exploratory research, if the most developed ones regarding CSR are also the most involved in the shared value process. In addition, value creation will be examined regarding supporters. This study, realized in 2012, allows discovering that if CSR is well developed in the observed football clubs, differences exist between them and opportunities to create shared value can still be taken. We will show that the success of one club doesn’t depend only of the financial and human resources. A successful RSE process has an impact on the representation that the stakeholders have about the club and on the engagement for the club. [less ▲]

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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)

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

E-print/Working paper (2015)

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See detailPasseport santé pour bananier
Massart, Sébastien ULg

E-print/Working paper (2015)

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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.

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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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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 ▲]

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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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