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See detailContextual Multi-armed Bandits for the Prevention of Spam in VoIP Networks
Jung, Tobias ULg; Martin, Sylvain ULg; Ernst, Damien ULg et al

E-print/Working paper (2012)

In this paper we argue that contextual multi-armed bandit algorithms could open avenues for designing self-learning security modules for computer networks and related tasks. The paper has two ... [more ▼]

In this paper we argue that contextual multi-armed bandit algorithms could open avenues for designing self-learning security modules for computer networks and related tasks. The paper has two contributions: a conceptual one and an algorithmical one. The conceptual contribution is to formulate -- as an example -- the real-world problem of preventing SPIT (Spam in VoIP networks), which is currently not satisfyingly addressed by standard techniques, as a sequential learning problem, namely as a contextual multi-armed bandit. Our second contribution is to present CMABFAS, a new algorithm for general contextual multi-armed bandit learning that specifically targets domains with finite actions. We illustrate how CMABFAS could be used to design a fully self-learning SPIT filter that does not rely on feedback from the end-user (i.e., does not require labeled data) and report first simulation results. [less ▲]

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See detailWanted ! Avez-vous vu ces plantes ? La conservation des plantes messicoles dans le cadre du Programme Agroenvironnemental wallon
Piqueray, Julien ULg; Gilliaux, Valentin ULg; Mahy, Grégory ULg

E-print/Working paper (2012)

Afin de mener à bien un projet de conservation des plantes messicoles menacées, la Faculté AgroBioTech de Gembloux appelle à diffuser vos observations de terrain au DEMNA

Detailed reference viewed: 18 (2 ULg)
See detailGenerational Accounting in Belgium: Fiscal Sustainability at a Glance
Decoster, André; Flawinne, Xavier ULg; Vanleenhove, Pieter

E-print/Working paper (2012)

Detailed reference viewed: 50 (13 ULg)
See detailLes Wallons du Wisconsin
Lempereur, Françoise ULg

E-print/Working paper (2012)

In the middle of the XIXe century, thousands of Walloon left Belgium to settle in Wisconsin, more than 3100 miles away.

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See detailDo Mutual Fund Investors Still Trust Standard Risk-Adjusted Performance Measures?
Bodson, Laurent ULg; Cave, Arnaud; Sougné, Danielle ULg

E-print/Working paper (2012)

We study the relationship between the risk-adjusted performance of mutual funds and their money flows (i.e. their subscriptions and redemptions). Testing the most traditional risk-adjusted performance ... [more ▼]

We study the relationship between the risk-adjusted performance of mutual funds and their money flows (i.e. their subscriptions and redemptions). Testing the most traditional risk-adjusted performance measures, we identify the ones which best explain the flows of equity, bond or mixed funds. The risk-adjusted performance measures which attract the most the attention from investors are the Information ratios (mono- and multi-factor), the M-squared and the Sharpe ratios (traditional Sharpe ratios and Sharpe MVaR). We may conclude that fund managers who want to maximize their AuM (and, if applicable, increase their AuM based fees) must mainly focus their efforts on improving these standard performance measures. Furthermore, we also demonstrate that the performance-flow relationship is concave then convex. Indeed, amongst the funds with a negative performance, those achieving the worst results are affected by disproportionately high net outflows whereas, on the opposite side of the spectrum, the most successful funds experience much higher capital inflows. [less ▲]

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See detailNewsletter n°6 - DACEFI
Meunier, Quentin; Moumbogou, Carl; Morin, Amélie et al

E-print/Working paper (2012)

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See detailEcaussinnes 2012 - Spring Blues Festival
Sacré, Robert ULg

E-print/Working paper (2012)

Compte-rendu du Spring Blues Festival d'Ecaussinnes, le 19 mai 2012

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See detailRenforcer la formation en sciences humaines en réduisant l’histoire-géo : cherchez l’erreur!
Jadoulle, Jean-Louis ULg

E-print/Working paper (2012)

Cette "carte blanche" fait suite à la décision de la Ministre de l'Enseignement obligatoire, Marie-Dominique Simonet, de réviser les grilles - horaires de l'enseignement qualifiant. Elle reprend la teneur ... [more ▼]

Cette "carte blanche" fait suite à la décision de la Ministre de l'Enseignement obligatoire, Marie-Dominique Simonet, de réviser les grilles - horaires de l'enseignement qualifiant. Elle reprend la teneur d'une lettre qui lui a été adressée et qui a été co-signée par plus de 140 enseignants, formateurs d'enseignants et membres de la société civile. [less ▲]

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See detailA Global Approach to Mutual Funds Market Timing Ability
Sougné, Danielle ULg; Bodson, Laurent ULg; Cavenaile, Laurent

E-print/Working paper (2012)

In this paper, we globally investigate market timing abilities of mutual fund managers from the three perspectives: market return, market-wide volatility and aggregate liquidity. We propose a new ... [more ▼]

In this paper, we globally investigate market timing abilities of mutual fund managers from the three perspectives: market return, market-wide volatility and aggregate liquidity. We propose a new specification to study market timing. Instead of considering an average market exposure for mutual funds, we allow mutual fund market betas to follow a random walk in the absence of market timing ability. As a consequence, we capture market exposure dynamics which is really due to manager market timing skills while allowing dynamics to come from other sources than market timing. We find that on average 6% of mutual funds display return market timing abilities while this percentage amounts to respectively 13% and 14% for volatility and liquidity market timing. We also analyze market timing by investment strategies and for surviving and dead funds. Dead fund exhibit lower volatility and liquidity timing skills than live funds. [less ▲]

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See detailDo Mutual Fund Investors Still Trust Standard Risk-Adjusted Performance Measures?
Sougné, Danielle ULg; Bodson, Laurent ULg; Cave, Arnaud

E-print/Working paper (2012)

We study the relationship between the past performance of mutual funds and their capital flows (i.e. their subscriptions and redemptions). Testing the most traditional risk-adjusted performance measures ... [more ▼]

We study the relationship between the past performance of mutual funds and their capital flows (i.e. their subscriptions and redemptions). Testing the most traditional risk-adjusted performance measures, we identify the ones which best explain the flows of US equity mutual funds. [less ▲]

Detailed reference viewed: 44 (6 ULg)
See detailLe public est tenu à distance
Corswarem, Emilie ULg; Levaux, Christophe ULg

E-print/Working paper (2012)

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See detailTraffic Situation Assessment and Intervention Strategy of a Collision Avoidance System based on Galileo Satellite Positioning
Christen, Fréderic ULg; Ewald, Christian; Eckstein, Lutz et al

E-print/Working paper (2012)

Nowadays, collision avoidance systems (CAS) are an intensive research topic since the majority of all traffic accidents are collisions that are caused due to inattention or unadjusted driving behavior of ... [more ▼]

Nowadays, collision avoidance systems (CAS) are an intensive research topic since the majority of all traffic accidents are collisions that are caused due to inattention or unadjusted driving behavior of the driver. Up to date prototypic CAS are based on on-board environmental sensors, such as camera or radar systems, that scan the vehicle's surrounding environment in order to assess the situation's hazardousness. The functionality of the used sensors under varying environmental conditions and the limited sensor covering area require an enormous effort to ensure a reliable detection of obstacles, and thus limit the application of the systems. In order to expand the operating field of such systems, a Galileo-based CAS will be developed within the project ‘Galileo above’ (application centre for ground based traffic). This advanced driver assistance system (ADAS) detects surrounding vehicles that are on collision course and reacts autonomously, if the driver does not intervene to avoid the crash. For this purpose the system initiates an emergency stop and/or an emergency steering maneuver. For the development of the CAS the Galileo test centre automotiveGATE in Aldenhoven, Germany will be used. On this test area pseudolites will be installed which provide Galileo-like navigation signals. Thus, the development respectively tuning of Galileo-based vehicle systems will be enabled, so as to have them available on the market when the Galileo satellite system reaches its full operational capability (FOC). The focus of this paper is on the traffic situation assessment and intervention strategy of the CAS. This includes the perception and analysis of the driving situation, the detection of potential collision situation, the definition of an adequate system reaction and the planning of an evasion trajectory. Furthermore, an outlook on the model predictive control for longitudinal and/or lateral control (braking and/or steering maneuver) will be presented. [less ▲]

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See detailInstitutional Change and Legislative Stability: Explicit and Contested Decision-Making in the EU Council (1995-2010)
Van Aken, Wim ULg

E-print/Working paper (2012)

In contrast to general expectations the growth of EU membership as well as European treaty reform has not had any significant impact on the Council’s overall legislative and roll call activity. On the ... [more ▼]

In contrast to general expectations the growth of EU membership as well as European treaty reform has not had any significant impact on the Council’s overall legislative and roll call activity. On the basis of a new dataset representing the total population of public roll calls and recorded votes in the Council this paper explains why the EU Council has been so successful in guaranteeing legislative and roll call stability between 1995 and 2010. The quantitative and qualitative analysis finds that frontloading legislation, changing voting behaviour, reinforcement of existing coalition patterns and the successful adjustment of newer Member States to the EU Council have contributed to the EU Council’s decision-making capacity during the observed 16 years. In explaining the apparent contradiction between institutional change and the Council’s legislative stability this paper contributes to our knowledge of the functioning, the decision-making processes and the geography of contestation in the EU Council. [less ▲]

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See detailBriefe an Casanova
Roggendorf, Cécile de; Viehöver, Vera ULg

E-print/Working paper (2012)

Detailed reference viewed: 25 (1 ULg)
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See detailThe size and book-to-market effects revisited
Lambert, Marie ULg; Hübner, Georges ULg

E-print/Working paper (2012)

Detailed reference viewed: 18 (2 ULg)
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See detailSOUTHERN BLUES NIGHT Heerlen, Hollande) 2012
Sacré, Robert ULg

E-print/Working paper (2012)

Detailed reference viewed: 8 (0 ULg)
See detailRossano Rosi: triangle amoureux et paternité
Demoulin, Laurent ULg

E-print/Working paper (2012)

Compte rendu du roman de Rossano Rosi Stabat Pater paru aux Impressions nouvelles en mars 2012.

Detailed reference viewed: 17 (2 ULg)
See detailDans le discontinu de la vie
Demoulin, Laurent ULg

E-print/Working paper (2012)

Compte rendu du roman de Caroline Lamarche La Chienne de Naha paru chez Gallimard en janvier 2012.

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See detailNewsletter n° 5 - DACEFI 2
Meunier, Quentin; Moumbogou, Carl; Angwé, A. et al

E-print/Working paper (2012)

Detailed reference viewed: 29 (6 ULg)
See detailEchecs
Demoulin, Laurent ULg

E-print/Working paper (2012)

Echecs est un roman inédit de Jean-Philippe Toussaint, antérieur à La Salle de bain. Il est ici édité avec un apparat critique: variantes et notes critiques.

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See detailOxford Centre for Evidence‐Based Medicine 2011 Levels of Evidence ‐ Traduction française
OCEBM Levels of Evidence Working Group; Durieux, Nancy ULg; Pasleau, Françoise ULg et al

E-print/Working paper (2012)

Detailed reference viewed: 349 (11 ULg)
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See detailHeinrich Rickert's Philosophy of History And Its Reception 1896-1936: An Annotated Bibliography
Dewalque, Arnaud ULg

E-print/Working paper (2012)

Annotated bibliography of the main philosophical texts which testify the reception of Heinrich Rickert's much-discussed view on historical sciences from 1896 to 1936.

Detailed reference viewed: 59 (2 ULg)
See detailHow to optimally load a set of containers into an aircraft
Schyns, Michael ULg; Limbourg, Sabine ULg; Laporte, Gilbert

E-print/Working paper (2012)

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See detailLe design du système de contrôle de gestion dans les PMI tunisiennes: une modélisation contingente
Ghorbel, Jihene ULg; Van Caillie, Didier ULg

E-print/Working paper (2012)

A l'heure actuelle, il existe relativement peu de recherches qui traitent du système de contrôle de gestion des PME, spécialement dans le contexte tunisien, malgré leur importance économique. La présente ... [more ▼]

A l'heure actuelle, il existe relativement peu de recherches qui traitent du système de contrôle de gestion des PME, spécialement dans le contexte tunisien, malgré leur importance économique. La présente communication vise dès lors à élaborer un modèle théorique expliquant le design du système de contrôle de gestion dans les PMI tunisiennes, au départ d'une analyse de la littérature portant spécifiquement soit sur les PMI tunisiennes, soit sur le système de contrôle de gestion de la PME. Cette étude est réalisée en privilégiant deux angles d'analyse particulièrement importants au vu du contexte tunisien, à savoir la taille de l'entreprise et son positionnement sur le cycle de vie. [less ▲]

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See detailLes enjeux prospectifs wallons à la lumière d’un dispositif participatif
Guyot, Jean-Luc; Rieppi, Stéphane ULg; Van Cutsem, Michaël et al

E-print/Working paper (2012)

La prospective a souvent recours à la démarche participative. Fréquemment, dans son travail analytique, le prospectiviste fait intervenir les acteurs concernés par le système qu'il examine, que ceux-ci ... [more ▼]

La prospective a souvent recours à la démarche participative. Fréquemment, dans son travail analytique, le prospectiviste fait intervenir les acteurs concernés par le système qu'il examine, que ceux-ci opèrent dans ce système ou qu’ils possèdent une expertise particulière par rapport à celui-ci. Dans la majorité des cas, cette intervention s’effectue au cours de l’exercice prospectif. Le présent working paper expose un autre type de situation : l’intervention et la participation des acteurs se placent ici en amont du travail prospectif, au moment de la délimitation des enjeux et des thématiques à considérer dans le cadre du développement d’un programme de recherche. L'expérience présentée par les auteurs, bien qu’elle recoure à l’utilisation d’un outil relativement classique en prospective, à savoir le Delphi, revêt un aspect original. Développée auprès de deux publics distincts, des équipes de recherche d’une part et des membres de l’administration wallonne, d’autre part, elle a permis d’identifier un certain nombre d’enjeux prospectifs majeurs pour la Wallonie et de définir des objets de recherche en rapport avec ces derniers. L'identification et la présentation de ces enjeux fait l’objet du présent texte. Dans un premier temps, celui-ci se propose de décrire le processus d’identification de ces enjeux et, dans un second temps, d’expliciter la nature de ceux-ci. [less ▲]

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See detailModule 3, techniques de reconstitution forestière
Dubiez, Emilien; Vermeulen, Cédric ULg

E-print/Working paper (2012)

Detailed reference viewed: 31 (7 ULg)
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See detailMeasuring Downside and Extreme Risk Allocation in Equity Hedge Funds
Lambert, Marie ULg

E-print/Working paper (2012)

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See detailAccrued Pension Rights in Belgium: Microsimulation of Reforms
Jousten, Alain ULg; Perelman, Sergio ULg; Tarantchenko, Ekaterina ULg et al

E-print/Working paper (2012)

Detailed reference viewed: 31 (10 ULg)
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See detailInternet-Based Investing at the Edge of Chaos
Choffray, Jean-Marie ULg

E-print/Working paper (2012)

This paper presents a simple, seven-step approach, to surviving on World Street: an investment environment characterized by high frequency trading system; over leveraged shadow entities and hedge funds ... [more ▼]

This paper presents a simple, seven-step approach, to surviving on World Street: an investment environment characterized by high frequency trading system; over leveraged shadow entities and hedge funds; flash crashes, incompetent management, reverse merger frauds, dot bubble 2.0 IPOs and stealth central banks’ actions. Its goal is to help you design efficient investment strategies while protecting your assets. It is based on a personal research conducted over the last ten years, involving hundreds of observations, investment simulations and actual decisions. [less ▲]

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See detailCinéma 3D: d'une révolution à l'autre
Thonon, Jonathan ULg

E-print/Working paper (2012)

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See detailBronfenbrenner, écologie du développement humain. Réflexion et action pour la promotion de la santé
Absil, Gaëtan ULg; Vandoorne, Chantal ULg; Demarteau, Michel

E-print/Working paper (2012)

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See detailPronominal reference in Dutch: a corpus-based study of resemanticisation
De Vos, Lien ULg

E-print/Working paper (2012)

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See detailInventaire des papiers Michel Gloesener (1794-1876)
Caulier-Mathy, Nicole; Haesenne-Peremans, Nicole; Oger, Cécile ULg

E-print/Working paper (2012)

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See detailBringing Belgian public finances to a sustainable path
Jousten, Alain ULg; Hoj, Jens; Kozluk, Tomasz

E-print/Working paper (2012)

Economic growth is projected to be strengthening from mid-2011 onwards, but will be insufficient to restore the sustainability of public finances. The Belgian strategy to prefund ageing costs by ... [more ▼]

Economic growth is projected to be strengthening from mid-2011 onwards, but will be insufficient to restore the sustainability of public finances. The Belgian strategy to prefund ageing costs by generating fiscal surpluses to bring down public debt was derailed by the global crisis. Restoring the strategy is a priority, especially as spreads on Belgian debt have increased. This will require cuts in public spending, improving efficiency of policies, containing the growth of ageing-related costs and making the tax system more conducive to growth. While past experiences, such as in the 1990s, have shown that successful large consolidations are feasible, the task seems even more difficult this time as potential growth will be muted and interest rates are likely to increase. In this context, a credible fiscal consolidation plan requires the participation of all governments. Its effectiveness can be strengthened by improving the fiscal framework, in particular by introducing multi-year budgets, annual expenditure rules consistent with long-term targets and an enhanced role of an independent fiscal policy watchdog [less ▲]

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See detailA capacity game in transportation management
Amand, Guillaume ULg; Arda, Yasemin ULg

E-print/Working paper (2012)

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Peer Reviewed
See detailSolvyns (François-Balthazar)
Vandersmissen, Jan ULg

E-print/Working paper (2012)

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Peer Reviewed
See detaild'Hane-Steenhuyse (Charles-François)
Vandersmissen, Jan ULg

E-print/Working paper (2012)

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See detailFixed-rank matrix factorizations and Riemannian low-rank optimization
Mishra, Bamdev ULg; Meyer, Gilles ULg; Bonnabel, Silvere et al

E-print/Working paper (2012)

Motivated by the problem of learning a linear regression model whose parameter is a large fixed-rank non-symmetric matrix, we consider the optimization of a smooth cost function defined on the set of ... [more ▼]

Motivated by the problem of learning a linear regression model whose parameter is a large fixed-rank non-symmetric matrix, we consider the optimization of a smooth cost function defined on the set of fixed-rank matrices. We adopt the geometric optimization framework of optimization on Riemannian matrix manifolds. We study the underlying geometries of several well-known fixed-rank matrix factorizations and then exploit the Riemannian geometry of the search space in the design of a class of gradient descent and trust-region algorithms. The proposed algorithms generalize our previous results on fixed-rank symmetric positive semidefinite matrices, apply to a broad range of applications, scale to high-dimensional problems and confer a geometric basis to recent contributions on the learning of fixed-rank non-symmetric matrices. We make connections with existing algorithms in the context of low-rank matrix completion and discuss relative usefulness of the proposed framework. Numerical experiments suggest that the proposed algorithms compete with the state-of-the-art and that manifold optimization offers an effective and versatile framework for the design of machine learning algorithms that learn a fixed-rank matrix. [less ▲]

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See detailA Riemannian geometry for low-rank matrix completion
Mishra, Bamdev ULg; Karavadi, Adithya Apuroop; Sepulchre, Rodolphe ULg

E-print/Working paper (2012)

We propose a new Riemannian geometry for fixed-rank matrices that is specifically tailored to the low-rank matrix completion problem. Exploiting the degree of freedom of a quotient space, we tune the ... [more ▼]

We propose a new Riemannian geometry for fixed-rank matrices that is specifically tailored to the low-rank matrix completion problem. Exploiting the degree of freedom of a quotient space, we tune the metric on our search space to the particular least square cost function. At one level, it illustrates in a novel way how to exploit the versatile framework of optimization on quotient manifold. At another level, our algorithm can be considered as an improved version of LMaFit, the state-of-the-art Gauss-Seidel algorithm. We develop necessary tools needed to perform both first-order and second-order optimization. In particular, we propose gradient descent schemes (steepest descent and conjugate gradient) and trust-region algorithms. We also show that, thanks to the simplicity of the cost function, it is numerically cheap to perform an exact linesearch given a search direction, which makes our algorithms competitive with the state-of-the-art on standard low-rank matrix completion instances. [less ▲]

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See detailThe Retirement of the Migrant Labor Force: Pension Portability and Beyond
Jousten, Alain ULg

E-print/Working paper (2012)

The specificities of the workforce with a migrant background are often neglected in studies of retirement. Similarly, many studies of migration’s impact on pensions often focus on aggregate outcomes – ... [more ▼]

The specificities of the workforce with a migrant background are often neglected in studies of retirement. Similarly, many studies of migration’s impact on pensions often focus on aggregate outcomes – system sustainability or distributive characteristics. The present paper provides a fresh look at the nexus between these two literatures. It discusses the impact of the European social security coordination mechanisms on individual decision‐making and on the functioning of social security systems – with a focus on retirement. The paper argues that such effects are non‐negligible and are likely to have major policy consequences. [less ▲]

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See detailLow-rank optimization with trace norm penalty
Mishra, Bamdev ULg; Meyer, Gilles ULg; Bach, Francis et al

E-print/Working paper (2012)

The paper addresses the problem of low-rank trace norm minimization. We propose an algorithm that alternates between fixed-rank optimization and rank-one updates. The fixed-rank optimization is ... [more ▼]

The paper addresses the problem of low-rank trace norm minimization. We propose an algorithm that alternates between fixed-rank optimization and rank-one updates. The fixed-rank optimization is characterized by an efficient factorization that makes the trace norm differentiable in the search space and the computation of duality gap numerically tractable. The search space is nonlinear but is equipped with a particular Riemannian structure that leads to efficient computations. We present a second-order trust-region algorithm with a guaranteed quadratic rate of convergence. Overall, the proposed optimization scheme converges super-linearly to the global solution while still maintaining complexity that is linear in the number of rows of the matrix. To compute a set of solutions efficiently for a grid of regularization parameters we propose a predictor-corrector approach on the quotient manifold that outperforms the naive warm-restart approach. The performance of the proposed algorithm is illustrated on problems of low-rank matrix completion and multivariate linear regression. [less ▲]

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See detailLes initiatives informelles dans le Sud partagent-elles une logique capitaliste ou représentent-elles les germes d’une économie solidaire ? Le cas de Santiago du Chili
Bauwens, Thomas ULg; Lemaître, Andreia

E-print/Working paper (2012)

Do informal initiatives display the capitalist spirit of entrepreneurship that they are often supposed to share? It is this question that this working paper is devoted to, trying to answer it through the ... [more ▼]

Do informal initiatives display the capitalist spirit of entrepreneurship that they are often supposed to share? It is this question that this working paper is devoted to, trying to answer it through the “popular economy” approach, focusing on the case of Chile. In a first step, based on a historical approach, we try to understand why the number of economic popular organizations shrank substantially since the end of the 80’s. In a second step, we bring elements of answer to the original question on the basis of deep case-studies undertaken in 2012 in Santiago de Chile. [less ▲]

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See detailGermanistische Mitteilungen 38.1
Bosse, Anke; Bunzel, Wolfgang; Ceuppens, Jan et al

E-print/Working paper (2012)

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See detailAn expanding Universe without dark matter and dark energy
Magain, Pierre ULg

E-print/Working paper (2012)

Assuming that observers located inside the Universe measure a time flow which is different from the time appearing in the Friedmann-Lemaıtre equation, and determining this time flow such that the Universe ... [more ▼]

Assuming that observers located inside the Universe measure a time flow which is different from the time appearing in the Friedmann-Lemaıtre equation, and determining this time flow such that the Universe always appears flat to these observers, we derive a simple cosmological model which allows to explain the velocity dispersions of galaxies in galaxy clusters without introducing dark matter. It also solves the horizon problem without recourse to inflation. Moreover, it explains the present acceleration of the expansion without any resort to dark energy and provides a good fit to the observations of distant supernovæ. Depending on the present value of the matter-energy density, we calculate an age of the Universe between 15.4 and 16.5 billion years, ignificantly larger than the 13.7 billion years of the standard CDM model. Our model has a slower expansion rate in the early epochs, thus leaving more time for the formation of structures such as stars and galaxies. [less ▲]

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See detailStrategic bypass deterrence
Bloch, Francis; Gautier, Axel ULg

E-print/Working paper (2012)

In liberalized network industries, entrants can either compete for service using the existing infrastructure (access) or deploy their own infrastructure capacity (bypass). In this paper, we demonstrate ... [more ▼]

In liberalized network industries, entrants can either compete for service using the existing infrastructure (access) or deploy their own infrastructure capacity (bypass). In this paper, we demonstrate that, under the threat of bypass, the access price set by an unregulated and vertically integrated incumbent is compatible with productive efficiency. This means that the entrant bypasses the existing infrastructure only if it can produce the network input more efficiently. We show that the incumbent lowers the access price compared to the ex-post efficient level to strategically deter inefficient bypass by the entrant. Accordingly, from a productive efficiency point of view, there is no need to regulate access prices when the entrant has the option to bypass. Despite that, we show that restricting the possibilities of access might be profitable for consumers and welfare because competition is fiercer under bypass. [less ▲]

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See detailEntrepreneuriat social
Mertens de Wilmars, Sybille ULg; Defourny, Jacques ULg

E-print/Working paper (2012)

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See detailLe financement des associations en Belgique francophone
Mertens de Wilmars, Sybille ULg; Marée, Michel ULg

E-print/Working paper (2012)

En raison de la nature de leurs activités et de leur finalité non lucrative, les associations rencontrent des problèmes spécifiques de financement, que ce soit au niveau de leurs opérations courantes ou ... [more ▼]

En raison de la nature de leurs activités et de leur finalité non lucrative, les associations rencontrent des problèmes spécifiques de financement, que ce soit au niveau de leurs opérations courantes ou de leurs dépenses d'investissements. Toutefois, Il existe encore peu d'études empiriques sur cette question dans les pays francophones, de sorte que nombre d'a priori - comme par exemple le fait que les associations auraient peu de garanties à offrir aux banques - sont communément admis sans qu'ils soient validés par des données de terrain. Pour mieux cerner la problématique du financement de l'associatif dans ses dimensions concrètes, on a réalisé un premier "état des lieux" du financement du secteur associatif en Belgique francophone (Wallonie et Bruxelles) en procédant à une enquête auprès d'un échantillon représentatif. Un des enseignements de cette recherche concerne précisément les relations avec les institutions bancaires. En cas de difficultés de trésorerie, la moitié à peine des associations recourent au crédit de caisse, les autres préférant se tourner vers leurs membres, vers les pouvoirs publics ou encore vers une autre association. Moins nombreuses encore sont les associations qui s'adressent aux banques pour financer leurs investissements. Mais contrairement à l'opinion courante, la principale raison ne réside ni dans les difficultés d'obtention d'un crédit, ni dans la lourdeur des formalités nécessaires : si les associations n'empruntent guère aux banques, c'est essentiellement pour des raisons de principe (ne pas s'endetter auprès des institutions bancaires). Ces raisons sont vraisemblablement liées, d'une part, à une aversion plus marquée du risque que les PME et, d'autre part, à une prise de distance à l'égard des principes de l'économie marchande. [less ▲]

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See detailOn the use of adhesion parameters to validate models specified using systems of affine differential equations
Jaeger, Jonathan ULg; Lambert, Philippe ULg

E-print/Working paper (2012)

A strategy for the selection of system of differential equations is proposed based on Bayesian ODE-penalized B-spline approach. It estimates the ODE parameters, approximates the solution of the ODE model ... [more ▼]

A strategy for the selection of system of differential equations is proposed based on Bayesian ODE-penalized B-spline approach. It estimates the ODE parameters, approximates the solution of the ODE model and quantifies the suitability of the proposed differential equations to model the dynamics of the observed state functions. Simulation study confirms that these ODE-adhesion parameters are able to question a system of differential equations as a descriptor of the dynamics in the state functions. This methodology is illustrated on a pharmacokinetic study. [less ▲]

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See detailInstituants et prix culturels, Québec, 1919-1939 : histoire culturelle et base de données
Dozo, Björn-Olav ULg; Lacroix, Michel; Lapointe, Olivier

E-print/Working paper (2012)

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See detailAre crises separating stock markets?
Muller, Aline ULg; Babaei, Hamid ULg

E-print/Working paper (2012)

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See detailPair trading: a dynamic cointegration approach
Muller, Aline ULg; Babaei, Hamid ULg

E-print/Working paper (2012)

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See detailCinq jalons de réflexion autour d’un projet de recherche
Badir, Sémir ULg

E-print/Working paper (2012)

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See detailRose-Marie François, L'Adieu, Une promenade douce-amère
Demoulin, Laurent ULg

E-print/Working paper (2011)

Compte rendu du recueil de poèmes L'Adieu de Rose-Marie François

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Peer Reviewed
See detailMeasuring poverty without the mortality paradox
Lefebvre, Mathieu ULg; Pestieau, Pierre ULg; Ponthiere, Grégory ULg

E-print/Working paper (2011)

Under income-differentiated mortality, poverty measures reflect not only the "true" poverty, but, also, the interferences or noise caused by the survival process at work. Such interferences lead to the ... [more ▼]

Under income-differentiated mortality, poverty measures reflect not only the "true" poverty, but, also, the interferences or noise caused by the survival process at work. Such interferences lead to the Mortality Paradox: the worse the survival conditions of the poor are, the lower the measured poverty is. We examine several solutions to avoid that paradox. We identify conditions under which the extension, by means of a fictitious income, of lifetime income profiles of the prematurely dead neutralizes the noise due to differential mortality. Then, to account not only for the "missing" poor, but, also, for the "hidden" poverty (premature death), we use, as a fictitious income, the welfare-neutral income, making indifferent between life continuation and death. The robustness of poverty measures to the extension technique is illustrated with regional Belgian data. [less ▲]

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See detailEvidence on the Determinants of Innovation in a Sample of Spanish firms
Artige, Lionel ULg

E-print/Working paper (2011)

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See detailNewsletter n°4 - DACEFI
Meunier, Quentin; Moumbogou, Carl; Ibinga, S. et al

E-print/Working paper (2011)

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See detailComment se finance le secteur associatif? Résultats d'une enquête de terrain en Belgique francophone
Mertens de Wilmars, Sybille ULg; Marée, Michel ULg

E-print/Working paper (2011)

Ce rapport expose les résultats d'une enquête de terrain menée en Belgique francophone fin 2010 auprès d 'environ 500 associations employeurs. Les thèmes de l'enquête concernent la situation bilantaire ... [more ▼]

Ce rapport expose les résultats d'une enquête de terrain menée en Belgique francophone fin 2010 auprès d 'environ 500 associations employeurs. Les thèmes de l'enquête concernent la situation bilantaire des associations, le financement des dépenses courantes, le financement des dépenses d'investissement, la situation de trésorerie et les apports non monétaires. [less ▲]

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See detailLève-toi et entreprends !...
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

Quelques pistes de réflexion pour faire face, avec solidarité, créativité, intelligence, et détermination, aux défis humains et économiques que pose la reconversion industrielle d'ArcelorMittal.

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See detailPolitique fiscale: quelles perspectives à moyen terme?
Jousten, Alain ULg

E-print/Working paper (2011)

The paper discusses the medium term adequacy of belgian tax policy. The paper reviews the architecture of the current system as well as its recent reforms. It draws on international experience to ... [more ▼]

The paper discusses the medium term adequacy of belgian tax policy. The paper reviews the architecture of the current system as well as its recent reforms. It draws on international experience to highlight the need for substantial structural reforms of the main tax instuments. [less ▲]

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See detailSurprise… Surprise ! Six ouvrages publiés sur le Net, que je n’ai jamais autorisés !
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

Passé un premier étonnement, ce n’est pas désagréable de découvrir que d’autres apprécient suffisamment certaines de vos contributions scientifiques pour se les approprier, et les publier sur le Net sous ... [more ▼]

Passé un premier étonnement, ce n’est pas désagréable de découvrir que d’autres apprécient suffisamment certaines de vos contributions scientifiques pour se les approprier, et les publier sur le Net sous la forme de divers ouvrages numériques et/ou physiques. [less ▲]

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See detail"Oh wow. Oh wow. Oh wow."
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

Pour les enseignants/chercheurs universitaires, et autres scientifiques, de ma génération, il y a incontestablement un « avant » et un « après » Apple II !... Plus que tout autre, au travers de sa ... [more ▼]

Pour les enseignants/chercheurs universitaires, et autres scientifiques, de ma génération, il y a incontestablement un « avant » et un « après » Apple II !... Plus que tout autre, au travers de sa créativité, de son ingéniosité, et de son sens de l’entreprise, Steve Jobs a durablement créé de nouvelles opportunités de développement intellectuel et professionnel. [less ▲]

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See detailDubois La Liberté
Demoulin, Laurent ULg

E-print/Working paper (2011)

Compte rendu de l'ouvrage de Jacques Dubois Les Figures du désir.

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See detailIntermediaries, transport costs and interlinked transactions
Lefevre, Mélanie ULg; Tharakan, Joseph ULg

E-print/Working paper (2011)

Transport costs play a key role in agricultural markets in developing countries and are one of the causes of poverty amongst farmers that are geographically isolated. Another characteristic of ... [more ▼]

Transport costs play a key role in agricultural markets in developing countries and are one of the causes of poverty amongst farmers that are geographically isolated. Another characteristic of agricultural markets is that they often involve interlinked transactions. However, the existing theoretical literature on interlinked transactions does not take into account the existence of transport costs. This paper develops a model of input-output interlinked contracts between geographically dispersed farmers and a trader, whether this trader is for-profit or non-profit. We derive implications of imposing either uniform or mill pricing policies, as opposed to spatial price discrimination. Impact on profit, farmers' income, level of production, social welfare and regional disparities are investigated. [less ▲]

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See detailNew Orleans Jazz & Heritage Festival 2011 - compte-rendu
Sacré, Robert ULg

E-print/Working paper (2011)

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See detailModule 3, techniques de reconstitution forestière
Dubiez, Emilien; Vermeulen, Cédric ULg

E-print/Working paper (2011)

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See detailLe prix de l'incompétence (2)
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

Poser la question de la compétence des administrateurs des banques belges, et celle de la pertinence du démantèlement de Fortis, c'est y répondre !... Réaction personnelle à la position courageuse ... [more ▼]

Poser la question de la compétence des administrateurs des banques belges, et celle de la pertinence du démantèlement de Fortis, c'est y répondre !... Réaction personnelle à la position courageuse exprimée par La Libre Belgique. [less ▲]

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See detailBienvenue dans le désert des marchés
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

La dernière fois que nous avons évoqué ensemble l’évolution du monde, nous étions convenus que : « La crise de 2008/09 n’en était peut-être pas une, à tout le moins pas encore ! » Cet exposé fait le point ... [more ▼]

La dernière fois que nous avons évoqué ensemble l’évolution du monde, nous étions convenus que : « La crise de 2008/09 n’en était peut-être pas une, à tout le moins pas encore ! » Cet exposé fait le point sur la situation actuelle, dans toute sa radicalité. Pour nous y aider, il aborde trois dimensions qui permettent d’en définir, au mieux, le contour : la confiance, la compétence et la virtualité. [less ▲]

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See detailDAVID HONEY BOY EDWARDS R.I.P.
Sacré, Robert ULg

E-print/Working paper (2011)

Notice nécrologique d'une icone du blues africain-américain

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See detailNew Orleans Jazz & Heritage Festival 2011 - compte-rendu 3e partie
Sacré, Robert ULg

E-print/Working paper (2011)

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See detailThe HARPS search for southern extra-solar planets XXXII. Only 4 planets in the Gl~581 system
Forveille, T.; Bonfils, X.; Delfosse, X. et al

E-print/Working paper (2011)

The Gl 581 planetary system has generated wide interest, because its 4 planets include both the lowest mass planet known around a main sequence star other than the Sun and the first super-Earth planet in ... [more ▼]

The Gl 581 planetary system has generated wide interest, because its 4 planets include both the lowest mass planet known around a main sequence star other than the Sun and the first super-Earth planet in the habitable zone of its star. A recent paper announced the possible discovery of two additional super-Earth planets in that system, one of which would be in the middle of the habitable zone of Gl 581. The statistical significance of those two discoveries has, however, been questioned. We have obtained 121 new radial velocity measurements of Gl 581 with the HARPS spectrograph on the ESO 3.6 m telescope, and analyse those together with our previous 119 measurements of that star to examine these potential additional planets. We find that neither is likely to exist with their proposed parameters. We also obtained photometric observations with the 2.5 m Isaac Newton Telescope during a potential transit of the inner planet, Gl 581e, which had a 5% geometric transit probability. Those observations exclude transits for planet densities under 4 times the Earth density within -0.2 sigma to +2.7 sigma of the predicted transit center. [less ▲]

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See detailPower indices and the measurement of control in corporate structures
Crama, Yves ULg; Leruth, Luc ULg

E-print/Working paper (2011)

This paper proposes a review of the use of power indices in the corporate governance literature. It places the emphasis on the game-theoretic aspects of this research, but it also addresses some of the ... [more ▼]

This paper proposes a review of the use of power indices in the corporate governance literature. It places the emphasis on the game-theoretic aspects of this research, but it also addresses some of the key issues linked to the specific field of application. [less ▲]

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See detailFESTIVAL INTERNATIONAL DE LAFAYETTE 2011 compte rendu
Sacré, Robert ULg

E-print/Working paper (2011)

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See detailNewsletter N° 3 - DACEFI
Meunier, Quentin ULg; Moumbogou, Carl; Ndoutoume, C. et al

E-print/Working paper (2011)

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See detailRéflexion sur la vie de Tony Choffray
Choffray, Jean-Marie ULg

E-print/Working paper (2011)

Réflexion sur la vie de Monsieur Tony Choffray, ingénieur et entrepreneur

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See detailBill Viola, L'espace d'un instant
Thonon, Jonathan ULg

E-print/Working paper (2011)

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See detailNew Orleans Jazz & Heritage Festival - compte-rendu 2e partie
Sacré, Robert ULg

E-print/Working paper (2011)

suite du compte rendu

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See detailNew Orleans Jazz & Heritage Festival 2011 - compte-rendu
Sacré, Robert ULg

E-print/Working paper (2011)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailThe changing face of disability insurance
Jousten, Alain ULg; Lefebvre, Mathieu ULg; Perelman, Sergio ULg

E-print/Working paper (2011)

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See detailSudokus' ranks
Merciadri, Luca ULg; Eastham, Chip

E-print/Working paper (2011)

A Latin square of order n^2 is a Sudoku matrix if subdividing its entries into n^2 disjoint n-by-n subblocks causes each symbol to appear once in each subblock. Symbols are taken from {1, ..., n^2}, and n ... [more ▼]

A Latin square of order n^2 is a Sudoku matrix if subdividing its entries into n^2 disjoint n-by-n subblocks causes each symbol to appear once in each subblock. Symbols are taken from {1, ..., n^2}, and n^2 = 9 then corresponds to the familiar recreation. A construction of cyclic latin squares (see Shiu, W.C. and Fang, K.T. and Ma, S. L., On the Rank of Cyclic Latin Squares, Linear and Multilinear Algebra, Vol. 40, pp. 183-188) determines their minimum rank and shows they can attain full rank. It follows that Sudoku matrices can also be full rank. The present authors initially thought that the minimum ranks of Sudoku matrices would equal the minimum ranks of cyclic latin squares of the same order, i.e. 1 + \sum_{i=1}^{s} \varphi\left((p_i)^{t_i}\right) where n=\prod_{i=1}^{s} (p_i)^{t_i} is the prime factorization (of n), and \varphi is Euler's totient function. However, a block-cyclic latin square construction is found that attains a smaller rank. For the case n^2 = 9, one gets a rank 5 matrix rather than rank 7. Some generalizations such as taking symbols from {0, ..., n^2 -1} are discussed, and comparisons made to ranks of more general kinds of latin squares. We also discuss the possibility of finding a rank inferior to 5 for a 9*9 Sudoku matrix. (Until here, no test revealed such a possibility, but tests are not finished yet.) [less ▲]

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See detailLe phénomène de l’"empowerment"
Blavier, André ULg

E-print/Working paper (2011)

L'empowerment repose sur 4 tendances technologiques majeures: les technologies sociales et de crowdsourcing, les technologies mobiles intelligentes, les technologies de vidéo pervasive, et, enfin, les ... [more ▼]

L'empowerment repose sur 4 tendances technologiques majeures: les technologies sociales et de crowdsourcing, les technologies mobiles intelligentes, les technologies de vidéo pervasive, et, enfin, les services de Cloud Computing. [less ▲]

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See detailPauvreté et mortalité différentielle chez les personnes âgées
Lefebvre, Mathieu ULg; Pestieau, Pierre ULg; ponthiere, gregory

E-print/Working paper (2011)

Cette note a pour objectif d’illustrer, dans le cas de la Belgique et de ses régions, un problème particulier posé par la mesure de la pauvreté. Etant donné que la mortalité varie selon le niveau de ... [more ▼]

Cette note a pour objectif d’illustrer, dans le cas de la Belgique et de ses régions, un problème particulier posé par la mesure de la pauvreté. Etant donné que la mortalité varie selon le niveau de revenu – les personnes aux revenus plus élevés vivant plus longtemps, en moyenne, que les personnes aux revenus plus faibles – les taux de pauvreté calculés pour les classes âgées dépendent non seulement de ce que l’on pourrait appeler la vraie pauvreté, mais aussi de la sélection induite par la mortalité différentielle selon le revenu. En calculant les taux de pauvreté que l’on observerait si des personnes avec différents niveaux de revenus avaient toutes la même espérance de vie, on peut ainsi estimer la vraie pauvreté, en neutralisant les interférences dues à la mortalité différentielle. Cet ajustement des mesures de pauvreté est particulièrement intéressant pour la Belgique, où les écarts de longévité entre Flamands et Francophones et entre riches et moins riches sont importants. [less ▲]

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See detailWillingness-to-pay for local milk-based dairy products in Senegal
Lefevre, Mélanie ULg

E-print/Working paper (2011)

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Using data from a choice-based ... [more ▼]

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Using data from a choice-based-conjoint analysis conducted on 400 households in the region of Dakar, we evaluate the premium that consumers are willing to pay for fresh raw material (rather than powder) in the composition of sour milk. Based on an Ordered Probit Model, the results show evidence for a positive WTP for fresh raw material, which may be seen as a strong indication of preference for local products. This WTP greatly depends on the characteristics of the households. Wealthier households are willing to pay more than the medium households, while big households are ready to pay much less than the base category ones. Obviously, some niche markets exist, that producers may target to sell the local milk-based dairy products. However, more information has to be provided about the composition of dairy products, as consumers are not currently able to distinguish both types of raw material, even if they are willing to pay more for one of them. In spite of some restrictions about the presence of a potential "hypothetical bias" due to the nature of the data, this study gives a rst insight of consumers' preferences for local milk-based dairy products. [less ▲]

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Peer Reviewed
See detailDe quelle totalité l'énonciation journalistique est-elle le fragment ?
Servais, Christine ULg

E-print/Working paper (2011)

Le discours d'information médiatique se caractérise certes par sa forme fragmentaire quant aux énoncés (par définition ouverts sur l'avenir et s’additionnant sans suite cohérente), mais encore par une ... [more ▼]

Le discours d'information médiatique se caractérise certes par sa forme fragmentaire quant aux énoncés (par définition ouverts sur l'avenir et s’additionnant sans suite cohérente), mais encore par une forme d'énonciation « floue » parce que collective, voire institutionnelle. Nous examinons ici la manière dont, dans le discours journalistique, la dimension collective de la langue est rapportée sur la parole et sur l’acte d’énonciation. Nous considérons que l’énonciation journalistique est, à plusieurs titres, inachevée, notamment en ce que sa performativité ne va pas jusqu’à la responsabilité assumée de l’énonciateur. Il s’agit de tenter d’identifier les lignes de fracture qui traversent le sujet d’énonciation journalistique et, avec elles, le partage de responsabilités qui en est induit. Notre ambition est d’établir un lien entre la division propre à l’énonciation journalistique et un questionnement sur le partage de l’espace et de la parole publics, ce qui suppose de se demander, notamment en intégrant à l’analyse le concept derridien de « téléiopoièse », où et comment se situe, dans cette disposition, la participation du destinataire. [less ▲]

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Peer Reviewed
See detailPolymer Maximum Drag Reduction: A Unique Transitional State
Dubief, Yves; White, Christopher M.; Shaqfeh, Eric S.G. et al

E-print/Working paper (2011)

The upper bound of polymer drag reduction is identified as a unique transitional state between laminar and turbulent flow corresponding to the onset of the nonlinear breakdown of flow instabilities.

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