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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 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 ▲]

Detailed reference viewed: 44 (10 ULg)
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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 detailRevealing the crucial role of network rigidity on the fragility evolution of glasses
Yildirim, Can ULg; Raty, Jean-Yves ULg; Micoulaut, Mathieu

E-print/Working paper (2015)

If quenched fast enough, a liquid is able to avoid crystallization and will remain in a metastable supercooled state down to the glass transition, with an important increase in viscosity and relaxation ... [more ▼]

If quenched fast enough, a liquid is able to avoid crystallization and will remain in a metastable supercooled state down to the glass transition, with an important increase in viscosity and relaxation time towards equilibrium upon further cooling [1,2]. There are important differences in the way liquids relax as they approach the glass transition, rapid or slow variation in dynamic quantities under moderate temperature changes, and a simple means to quantify such variations is provided by the concept of "fragility". Here, we report molecular dynamics simulations of a typical network-forming glass, and find that the relaxation behaviour of the supercooled liquid is strongly correlated to the variation of rigidity with temperature and the spatial distribution of the corresponding topological constraints which, ultimately connect to fragility minima . This permits extending the fragility concept to aspects of topology/rigidity, and to the degree of homogeneity of the atomic-sale interactions for a variety of structural glasses. [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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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 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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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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Peer Reviewed
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 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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Peer Reviewed
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

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See detailDe la crise à l’entreprise, en passant par toi…
Choffray, Jean-Marie ULg

E-print/Working paper (2014)

De la crise à l’entreprise, en passant par toi… est une invitation à l’action, à la prise de responsabilité, à la création responsable de valeur économique et à la recherche obstinée de croissance ... [more ▼]

De la crise à l’entreprise, en passant par toi… est une invitation à l’action, à la prise de responsabilité, à la création responsable de valeur économique et à la recherche obstinée de croissance rentable. Oui! Notre monde vient d’échapper à un effondrement systémique dont 1929 n’aurait constitué qu’un aimable préambule. Oui ! L’entreprise est le seul acteur social créateur de richesse économique et la seule solution au mal qui se répand. Oui ! Il est extrêmement difficile de changer quoi que ce soit sur terre et d’apprendre à dire « non ! » En cas d’échec, le coût est connu : licenciement, exil, condamnation à mort ! [less ▲]

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See detailLettre d'information trimestrielle n° 15 du projet DACEFI 2
Boldrini, Sylvie; Meunier, Quentin; Moumbogou, Carl et al

E-print/Working paper (2014)

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See detailTowards a system of concept in GP/FM. Part I towards a specific indexation system. working draft
Jamoulle, Marc ULg

E-print/Working paper (2014)

EXECUTIVE SUMMARY Towards a system of concept on general practice / family medicine Part 1 Towards a specific indexation system in GP/FM Status of this document ; preliminary draft, not for diffusion ... [more ▼]

EXECUTIVE SUMMARY Towards a system of concept on general practice / family medicine Part 1 Towards a specific indexation system in GP/FM Status of this document ; preliminary draft, not for diffusion Intended audience : Members of the board of the PhD thesis of Marc Jamoulle, department of general practice, Liege University and experts in the field contacted by the author Background :Thousands of general practitioners/ family doctors are gathering each year in local, national or international congresses. They are exchanging thoughts, researches and methods through thousands of communications in various formats; posters, oral communications, workshops and so on. Although this huge collection of bottom-up knowledge is sometimes available through Internet sites, there is no specific indexation system allowing a real knowledge management of the exposed works. Consequently the information could not be reached, which don’t favor the exchange between researchers. The absence of a common indexation system is also a problem to organize the congresses and the participants have always difficulties to find communications relevant of their interest. The technology of semantic web and Linked data have emerged as a future solution to exchange data distributed in many languages between so many providers, the family physicians, spread around the globe. The considerable development of medical ontologies demonstrates the vitality of this field of discovery. Aim of the thesis; To find the best way to identify the main concepts effectively used by practicing GPs by the development of a system of classification embedded in the International classification of Primary Care aiming at retrieval of clinical and non-clinical issues addressed by the authors in their communications To propose a mapped terminology to this classification systems, in other words an ontology of GP/FM, to participle to a linked data based automatic or semi-automatic indexation of knowledge in GP/FM and its implementation in the realm of the semantic web. Content of the part 1 : the first steps towards a global classification system in GP/FM are related as well as previous experiences and difficulties with usual coding systems. The new information technology tools for information management are concisely described which permit the understanding of their importance in future research networks of knowledge in G/FM A comparison of the coding process and results of 6 congress of GP/FM in several countries and 4 languages has been performed to examine the internal reproducibility of the classifying system proposed. Next steps of the thesis are discussed of which first of them would be the constitution of an International research group. [less ▲]

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See detailLa diversité culturelle dans les accords commerciaux : vers une nouvelle approche ?
Vlassis, Antonios ULg

E-print/Working paper (2014)

En premier lieu, le numéro de septembre met en lumière le texte des accords commerciaux du Canada avec l’Union européenne et la Corée du Sud et il analyse la façon dont les négociateurs ont traité des ... [more ▼]

En premier lieu, le numéro de septembre met en lumière le texte des accords commerciaux du Canada avec l’Union européenne et la Corée du Sud et il analyse la façon dont les négociateurs ont traité des industries culturelles et de la question de la diversité des expressions culturelles. En deuxième lieu, il aborde les enjeux récents des services audiovisuels non-linéaires qui bouleversent les acteurs dans le paysage audiovisuel, ainsi que la nature et les objectifs de l’intervention publique dans le secteur. En troisième lieu, il met l’accent sur la confrontation entre les auteurs/éditeurs et le géant américain de commerce en ligne Amazon qui révèle l’importance de la mise en place de mesures réglementaires dans le domaine des services culturels numériques – tels que le livre électronique - qui représentent l’avenir du secteur. Enfin, Louise Beaudoin, ancienne ministre des Relations internationales et de la Francophonie du Québec et actrice de premier plan dans le processus de la construction de la Convention sur la diversité des expressions culturelles (CDEC) nous explique l’impact des technologies numériques sur la mise en œuvre de la CDEC, montrant la nécessité d’adapter la CDEC aux défis de l’ère numérique. [less ▲]

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See detailRetrouvailles à vélo avec Dick Annegarn
Demoulin, Laurent ULg

E-print/Working paper (2014)

Le nouveau CD de Dick Annegarn, Vélo va (2014), offre à son auditeur, à travers un bel échantillon de dix chansons, un aperçu des différentes facettes de l’art de l’auteur-compositeur-interprète.

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See detailSome misunderstood or unknown tricks (IX) (LaTeX)
Merciadri, Luca ULg

E-print/Working paper (2014)

We describe here how to display date & time in a standard format, write (draw) dash integrals, number rows in tables, use unhabitual punctuation marks: interrobang and percontation point, draw dependency ... [more ▼]

We describe here how to display date & time in a standard format, write (draw) dash integrals, number rows in tables, use unhabitual punctuation marks: interrobang and percontation point, draw dependency arrows, distinguish between ConTeXt, LuaTeX, teTeX and XeTeX. The last section gives a LaTeX-related crossword puzzle. [less ▲]

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See detailPresidential election in Turkey: a wide range of intricate challenges ahead of the next president
Sisu, Madalina; Lika, Liridon ULg

E-print/Working paper (2014)

On 10 August 2014, Turkey will hold the first round of presidential election which are of specific importance, as its results will shape the country’s both domestic politics and external relations. This ... [more ▼]

On 10 August 2014, Turkey will hold the first round of presidential election which are of specific importance, as its results will shape the country’s both domestic politics and external relations. This paper discusses the key challenges which Turkey’s next president must undertake. The domestic challenges range from revision of Constitution, Kurdish peace process and economic growth to polarization of society, freedom of judiciary, separation of powers and civil liberties. In the external relations area, the principal challenges are the worsening of country’s relations with its neighbours, security threats and the stalemate of the EU integration. Several domestic and external challenges are inter-related: for instance, the freedom of judiciary, separation of powers and civil liberties affect the EU integration process; the political uncertainty relates to economic growth and foreign investments; the Kurdish peace process impacts on the external security issues; the economic factors influence the relations with the Kurdistan Regional Government and Iraq’s central government; the Syrian crisis raises new challenges with regard to the Syrian refugees in Turkey. Therefore, addressing Turkey’s current domestic and external challenges will be a long, puzzling and often conflicting-results process. [less ▲]

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See detailRecueil de réglementation interne des principaux partis allemands, belges et britanniques
Bouhon, Frédéric ULg

E-print/Working paper (2014)

Le présent recueil compile des extraits de la réglementation interne des principaux partis allemands, belges et britanniques. Cette documentation vient principalement appuyer le chapitre 1er de la ... [more ▼]

Le présent recueil compile des extraits de la réglementation interne des principaux partis allemands, belges et britanniques. Cette documentation vient principalement appuyer le chapitre 1er de la deuxième partie de notre étude sur le droit électoral et le principe d’égalité (à paraître en septembre 2014 aux éditions Bruylant) dans laquelle nous avons notamment étudié une partie du droit interne de certaines formations politiques. [less ▲]

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See detailEn attendant Toussaint
Demoulin, Laurent ULg

E-print/Working paper (2014)

Présentation et analyse de deux courtes pièces, Rideau et Ni l'un ni l'autre, écrites par Jean-Philippe Toussaint en 1981, quand il était un jeune auteur inconnu influencé par Samuel Beckett.

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See detailLes métiers du développement durable
Cornet, Annie ULg; dubois, valérie

E-print/Working paper (2014)

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See detailProcedural rights in antitrust proceedings
Muheme, Daniel ULg; Neyrinck, Norman ULg; Petit, Nicolas ULg

E-print/Working paper (2014)

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See detailLa biblioteca nel romanzo moderno/2. Archetipo, tema, cronotopo
de Seta, Ilaria ULg

E-print/Working paper (2014)

Detailed reference viewed: 27 (2 ULg)
See detailLa biblioteca nel romanzo moderno. 1 Manzoni, Nievo, Pirandello e Tozzi
de Seta, Ilaria ULg

E-print/Working paper (2014)

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See detailShort Prime Quadratizations of Cubic Negative Monomials
Crama, Yves ULg; Rodriguez Heck, Elisabeth ULg

E-print/Working paper (2014)

Pseudo-Boolean functions naturally model problems in a number of different areas such as computer science, statistics, economics, operations research or computer vision, among others. Pseudo-Boolean ... [more ▼]

Pseudo-Boolean functions naturally model problems in a number of different areas such as computer science, statistics, economics, operations research or computer vision, among others. Pseudo-Boolean optimization (PBO) is NP-hard, even for quadratic polynomial objective functions. However, much progress has been done in finding exact and heuristic algorithms for the quadratic case. Quadratizations are techniques aimed at reducing a general PBO problem to a quadratic polynomial one. Quadratizing single monomials is particularly interesting because it allows quadratizing any pseudo-Boolean function by termwise quadratization. A characterization of short quadratizations for negative monomials has been provided. In this report we present a proof of this characterization for the case of cubic monomials, which requires a different analysis than the case of higher degree. [less ▲]

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See detailOptimization of the service start time for an elementary shortest path problem with time windows
Arda, Yasemin ULg; Crama, Yves ULg; Kucukaydin, Hande ULg

E-print/Working paper (2014)

We investigate an elementary shortest path problem with resource constraints where a single capacitated vehicle, initially located at a depot, must serve a set of customers while respecting their ... [more ▼]

We investigate an elementary shortest path problem with resource constraints where a single capacitated vehicle, initially located at a depot, must serve a set of customers while respecting their individual time windows. When the vehicle visits a customer, it delivers the customer's demand and collects a revenue in return for the delivery. The vehicle can start its trip at any desired time. The transportation cost is a function of both the total distance traveled and the duration of the assigned trip. The objective is to determine the service start time from the depot, the subset of customers to be served, and the trip to be performed so as to minimize the total loss, which is calculated as the di erence between the transportation cost and the revenue collected from the customers. We develop two exact dynamic programming algorithms which can deal with an in nite number of Pareto-optimal states arising from the fact that the starting time and the duration of the trip act like continuous decision variables. We report computational results obtained with these algorithms and with a faster heuristic for the elementary shortest path problem. We also examine the performance of these algorithms when they are used to solve the pricing subproblem arising in the framework of a column generation algorithm for a related vehicle routing problem with time windows. [less ▲]

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See detailNew Orleans Jazz & Heritage Festival 2014
Sacré, Robert ULg

E-print/Working paper (2014)

Compte rendu du NOLA Jazz & Heritage Festival avril-mai 2014 , avec photos

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See detailChina, 1978-2013: from one Plenum to another. Reflections on hopes and constraints for reform in the Xi Jingping era
Florence, Eric ULg

E-print/Working paper (2014)

Why is it so difficult to talk about China in a nuanced and contrasting manner without falling back on superlatives and generalisations? In about thirty years, China’s GDP per capita has multiplied by ... [more ▼]

Why is it so difficult to talk about China in a nuanced and contrasting manner without falling back on superlatives and generalisations? In about thirty years, China’s GDP per capita has multiplied by eight. From a marginal economic power during the Maoist period (1949-1978), China is now ranked tenth in terms of global economic weight. “Wealth and power” (fu qiang) is the expression that embodies China’s quest for modernity since the second half of the 19th century, when China was still under the yoke of the West. This ambition is still at the heart of the “Chinese dream of rejuvenation of the Chinese nation” dear to Xi Jinping, which he set out during the Third Plenum of the 18th Central Committee of the Chinese Communist Party. But focusing only on this vision of “wealth and power” takes us back to one of the most common ways of representing China: reducing the ongoing socio-economic changes and dynamics to a set of numeric values, ultimately reified and homogenised. The increased power and internationalisation of the Chinese economy has prompted a combination of worry and enthusiasm. What does this imply about the paradigm shift in the way we portray this country? Perhaps it is still hard to leave behind the image of a subordinate, poor and voiceless China and consider the Chinese people as, at least, our equals. [less ▲]

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See detailL’Université de Liège pendant la guerre 1914-1918
Bechet, Christophe ULg

E-print/Working paper (2014)

Histoire de l'Université de Liège pendant la Grande Guerre, axée principalement sur le drame de la place du 20 août et l'occupation des locaux par l'armée allemande.

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See detailFonck meurt premier comme devant
Bechet, Christophe ULg

E-print/Working paper (2014)

Cet article revient sur le mythe du cavalier Fonck, premier soldat belge tué le 4 août 1914, sur la route Thimister-Battice

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See detailCulture et développement : le débat international s’intensifie
Vlassis, Antonios ULg

E-print/Working paper (2014)

Face à l’avènement du numérique et à la multiplication des négociations commerciales (Union européenne, États-Unis, Canada, Japon, Australie), la gouvernance mondiale des industries culturelles se trouve ... [more ▼]

Face à l’avènement du numérique et à la multiplication des négociations commerciales (Union européenne, États-Unis, Canada, Japon, Australie), la gouvernance mondiale des industries culturelles se trouve actuellement à un tournant. En premier lieu, le numéro de juillet traite des évolutions du débat sur l’inclusion de la culture dans l’agenda du développement durable post-2015, des initiatives dynamiques de la société civile en matière de culture, ainsi que des réticences des pays développés. En deuxième lieu, il aborde les enjeux récents des négociations commerciales en cours (Partenariat transpacifique, Partenariat transatlantique, accord sur le commerce des services) ainsi que les priorités de l’administration des États-Unis concentrées sur une inclusion dynamique des produits numériques dans l’agenda des négociations. Enfin, il présente plusieurs rapports qui mettent en lumière certains aspects de la mise en œuvre de la Convention sur la diversité des expressions culturelles (CDEC), tels que les politiques culturelles en Asie et l’impact de la CDEC, les effets normatifs de la CDEC, ainsi que son adaptation à l’ère numérique. [less ▲]

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See detailHalf a century of French organizational sociology: methodological roots, compositionist branches
Dubois, Christophe ULg

E-print/Working paper (2014)

Now that 50 years have gone by since the publication of The Bureaucratic Phenomenon (French title: Le phénomène bureaucratique, 1963) by Michel Crozier, what is the legacy bequeathed by the sociology of ... [more ▼]

Now that 50 years have gone by since the publication of The Bureaucratic Phenomenon (French title: Le phénomène bureaucratique, 1963) by Michel Crozier, what is the legacy bequeathed by the sociology of organizations, in France and elsewhere, to today’s researchers? This contribution considers the premises of this methodology in order to establish two important achievements: the “decomposition” of the notions of organization, State and market; and the distinction of three dimensions of organizations, i.e. their managerial discourse, formal and informal structures. This article ends by considering one contemporary challenge this tradition of research has to face: how to account for the mechanisms of collective action, in order to take part in its composition? [less ▲]

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See detailLes parlements peuvent-ils encore valider les pouvoirs de leurs élus?
Bouhon, Frédéric ULg

E-print/Working paper (2014)

Les élections du 25 mai 2014 ont été suivies de diverses contestations sur certains aspects de leur déroulement, spécialement au stade de leur dépouillement. C'est l'occasion de faire le point sur la ... [more ▼]

Les élections du 25 mai 2014 ont été suivies de diverses contestations sur certains aspects de leur déroulement, spécialement au stade de leur dépouillement. C'est l'occasion de faire le point sur la prérogative des assemblées législatives belges de vérifier elles-mêmes la validité des pouvoirs de leurs membres. [less ▲]

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See detailFederico García Lorca en Lieja
Francois, Jeromine ULg

E-print/Working paper (2014)

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See detailLettre d'information trimestrielle n° 14 du projet DACEFI 2
Meunier, Quentin; Moumbogou, Carl; Boldrini, Sylvie et al

E-print/Working paper (2014)

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See detailLa culture dans l'agenda du développement : 4ème pilier ou objectif transversal?
Vlassis, Antonios ULg

E-print/Working paper (2014)

Ce numéro aborde plusieurs questions qui se situent actuellement au cœur de la gouvernance mondiale des industries culturelles. En premier lieu, nous analysons le débat international relatif à la ... [more ▼]

Ce numéro aborde plusieurs questions qui se situent actuellement au cœur de la gouvernance mondiale des industries culturelles. En premier lieu, nous analysons le débat international relatif à la perspective d’inclure la culture dans les objectifs de l’agenda du développement durable post-2015, les initiatives récentes, ainsi que les rapports de force actuels. En deuxième lieu, nous présentons la publication annuelle du Rapport spécial 301 qui permet au Représentant américain au commerce d’identifier les pays qui ne protègent pas d’une façon appropriée et efficace les droits de propriété intellectuelle. En troisième lieu, nous traitons de la décision de l’avocat général de la Cour de justice de l’Union européenne relative au prix du livre numérique, ainsi que des batailles industrielles dans le secteur de la culture, comme celle d’Amazon contre Hachette ou de YouTube contre les producteurs indépendants de la musique, qui ont comme cible principale les auteurs et la création artistique. Enfin, Anna Steinkamp, coordinatrice du réseau international U40, nous explique l’importance des réseaux de connaissance pour la coopération internationale en matière de culture et la mise en œuvre dynamique de la Convention de 2005. [less ▲]

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See detailThe Macroeconomics of PAYG Pension Schemes in an Aging Society
Artige, Lionel ULg; Cavenaile, Laurent; Pestieau, Pierre ULg

E-print/Working paper (2014)

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See detailSome misunderstood or unknown tricks (VIII) and Turing-completeness (LaTeX)
Merciadri, Luca ULg

E-print/Working paper (2014)

We will begin by exposing new tricks, i.e. how to 1. write ‘closed’ square roots, 2. insert blank pages, 3. ask the reader to turn the page, 4. write bold words in an index, 5. divide a cell by a diagonal ... [more ▼]

We will begin by exposing new tricks, i.e. how to 1. write ‘closed’ square roots, 2. insert blank pages, 3. ask the reader to turn the page, 4. write bold words in an index, 5. divide a cell by a diagonal, 6. draw ‘product integrals,’ 7. understand what happens when \mathcal has a lower-case letter argument. We will then consider an uncommon example of what one can do with LaTeX, in link with its Turing completeness. [less ▲]

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Peer Reviewed
See detailHexis
Durand, Pascal ULg

E-print/Working paper (2014)

Définition et discussion du concept d'« Hexis » dans la sociologie de Pierre Bourdieu.

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See detailIllusio
Durand, Pascal ULg

E-print/Working paper (2014)

Définition et discussion du concept d'« Illusio » dans la sociologie de Pierre Bourdieu.

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See detailCapital symbolique
Durand, Pascal ULg

E-print/Working paper (2014)

Présentation et discussion du concept de « Capital symbolique » dans la sociologie de Pierre Bourdieu.

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See detailProtecting Assets Under Non-Parametric Market Conditions
Choffray, Jean-Marie ULg; Pahud de Mortanges, Charles ULg

E-print/Working paper (2014)

Under non-parametric market conditions, investors usually become more concerned about the return of their money than about the return on their money. Protecting assets becomes the surest if not the only ... [more ▼]

Under non-parametric market conditions, investors usually become more concerned about the return of their money than about the return on their money. Protecting assets becomes the surest if not the only path to survival and growth. High frequency trading systems, over leveraged shadow entities, flash crashes, and stealth central bank actions, to name a few, contribute to create a “Rumsfeldian” type of world in which decision makers have to cope not only with “Known knowns” – things they know that they know – but also with “Unknown unknowns” – things they don’t know that they don’t know! The goal of this paper is to explore such a conceptual model of the “Unknown” and to derive from it a concise and coherent set of battle-tested heuristics aimed at designing effective investment strategies to protect assets. [less ▲]

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien ULg; Heuchenne, Cédric ULg

E-print/Working paper (2014)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the ... [more ▼]

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional approach, we don't use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure (Mercurio and Spokoiny, 2004): the Local Adaptive Volatility Estimation (LAVE). The motivation for using this method is to avoid a possible model misspecification for the conditional variance. In a second step, we suggest a set of estimation and model selection procedures (Berk-Jones tests, kernel density-based selection, censored likelihood score, coverage probability) based on the so-obtained residuals. These methods enable to assess the global fit of a given distribution as well as to focus on its behavior in the tails. Finally, we illustrate our methodology on three time series (UBS stock returns, BOVESPA returns and EUR/USD exchange rates). [less ▲]

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See detailLes determinants des Price-Earnings ratios en Europe
Lambert, Marie ULg; Lenglois, Julien ULg; Streel, Alexandre ULg et al

E-print/Working paper (2014)

Méthode largement employée en matière d’évaluation d’entreprise, l’analyse dite comparative s’appuie sur une estimation de la valeur des entreprises selon un multiple de leur agrégat financier. Aussi ... [more ▼]

Méthode largement employée en matière d’évaluation d’entreprise, l’analyse dite comparative s’appuie sur une estimation de la valeur des entreprises selon un multiple de leur agrégat financier. Aussi appelée ‘méthode des pairs’, les multiples sont définis sur base d’un échantillon d’entreprises considérées comme comparable en termes de croissance et de risque. Le secteur est généralement retenu en pratique comme critère sous-tendant la croissance et le profil de risque opérationnel de l’entreprise. L’analyse menée dans cet article démontre l’importance des fondamentaux tels que la croissance, le risque et le taux de distribution des bénéfices dans la définition des pairs et donc de la valeur des entreprises. Sur base d’un échantillon des 100 entreprises cotées sur l’EURONEXT, entreprises les plus capitalisées et liquides, l’étude met en évidence un impact différencié de ces déterminants selon les conditions économiques. Les conséquences de notre analyse sont multiples. Premièrement, notre étude témoigne de l’importance des variables telles que le profil de risque et les perspectives croissance pour la sélection des pairs. Notre approche permet par ailleurs d’appréhender la valeur des entreprises sur base de leurs propres fondamentaux, corrigeant ainsi la méthode des multiples ‘sectoriels’ pour les différences qui subsistent au sein des sous-jacents de la valeur. Finalement, cet article nourrit une discussion quant à l’impact de la finance comportementale sur la valorisation de l’entreprise de par l’impact différencié des fondamentaux sur la valeur des entreprises au cours du temps. [less ▲]

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See detailEstimation and approximation in nonlinear dynamic systems using quasilinearization
Frasso, Gianluca ULg; Jaeger, Jonathan ULg; Lambert, Philippe ULg

E-print/Working paper (2014)

Nonlinear (systems of) ordinary differential equations (ODEs) are common tools in the analysis of complex one-dimensional dynamic systems. In this paper we propose a smoothing approach regularized by a ... [more ▼]

Nonlinear (systems of) ordinary differential equations (ODEs) are common tools in the analysis of complex one-dimensional dynamic systems. In this paper we propose a smoothing approach regularized by a quasilinearized ODE-based penalty in order to approximate the state functions and estimate the parameters defining nonlinear differential systems from noisy data. Within the quasilinearized spline based framework, the estimation process reduces to a conditionally linear problem for the optimization of the spline coefficients. Furthermore, standard ODE compliance parameter(s) selection criteria are easily applicable and conditions on the state function(s) can be eventually imposed using soft or hard constraints. The approach is illustrated on real and simulated data. [less ▲]

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See detailTentatives de réflexion sémiotique et psychanalytique au sujet du voile islamique
Demoulin, Laurent ULg

E-print/Working paper (2014)

La sémiotique et la psychanalyse sont peut-être de nature à enrichir le débat sur l'interdiction du voile islamique dans les lieux publics.

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See detailLe Parti Socialiste en 2014 : un programme électoral en rupture avec les précédents ?
Piet, Grégory ULg; Dandoy, Régis

E-print/Working paper (2014)

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See detailExamining the Effect of Earnings Management on Bid-Ask Spread and Market Liquidity
Sougné, Danielle ULg; Ajina, Aymen ULg

E-print/Working paper (2014)

The main purpose of this paper is to argue the extent that earnings management lowers liquidity. It should increase information asymmetry and impair trading liquidity. Using a sample of French firms from ... [more ▼]

The main purpose of this paper is to argue the extent that earnings management lowers liquidity. It should increase information asymmetry and impair trading liquidity. Using a sample of French firms from 2008 to 2011, we find that firms that manage earnings have wider bid-ask spreads. Our results are robust for both of two well established measures of market liquidity. Therefore the empirical results indicate that firms that exhibit greater earnings management are associated with lower market liquidity. These findings are in line with adverse selection and shed light on the role corporate governance devices can play in the consideration of shareholder interest’s protection, which leads to improved stock market liquidity levels. [less ▲]

Detailed reference viewed: 151 (8 ULg)