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See detailAlexander Kluge et Heiner Müller, ou quand l'interview devient un art
Dupont, Bruno ULg

E-print/Working paper (2013)

Les interviews entre Alexander Kluge et Heiner Müller dans les années nonante sont devenues légendaires, à tel point qu'on les considère comme une partie de l'œuvre du dramaturge de la RDA. Elles sont le ... [more ▼]

Les interviews entre Alexander Kluge et Heiner Müller dans les années nonante sont devenues légendaires, à tel point qu'on les considère comme une partie de l'œuvre du dramaturge de la RDA. Elles sont le témoin de l'irruption de Kluge dans l'audiovisuel allemand, ainsi que de la pensée et la parole de Müller. La publication de leur recueil en français permet de revivre ces dialogues, fruit de la rencontre de deux artistes hors-normes. Diffusés il y a vingt ans, ces échanges sont toujours actuels. Cet article explique pourquoi. [less ▲]

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See detailSOUTHERN BLUES NIGHT , Heerlen (NL) 17e ed. , 15 mars 2013
Sacré, Robert ULg

E-print/Working paper (2013)

C.R. de la 17e Southern Blues Night , le 15 mars 2013 à Heerlen ( Nl) + photos ; Khalif Wailin' Walter , Mud Morganfield, Heritage Blues Orchestra, James Harman, Enrico Crivellaro, Gene Taylor, ....

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See detailPage de Beckett et Beckett de Page
Demoulin, Laurent ULg

E-print/Working paper (2013)

Compte rendu du livre de Martin Page L'Apiculture selon Samuel Beckett.

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See detailCompte rendu de Claude Simon: Situations
Demoulin, Laurent ULg

E-print/Working paper (2013)

Compte rendu du passionnant ouvrage dirigé par Paul Dirkx et Pascal Mougin au sujet de Claude Simon. Esquisse de réflexion sur la clôture du texte.

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See detailGravitationall lensing evidence against extended dark matter halos
Magain, Pierre ULg; Chantry, Virginie ULg

E-print/Working paper (2013)

It is generally thought that galaxies are embedded in dark matter halos extending well beyond their luminous matter. The existence of these galactic halos is mainly derived from the larger than expected ... [more ▼]

It is generally thought that galaxies are embedded in dark matter halos extending well beyond their luminous matter. The existence of these galactic halos is mainly derived from the larger than expected velocities of stars and gas in the outskirts of spiral galaxies. Much less is known about dark matter around early-type (elliptical or lenticular) galaxies. We use gravitational lensing to derive the masses of early-type galaxies deflecting light of background quasars. This provides a robust measurement of the total mass within the Einstein ring, a circle whose diameter is comparable to the separation of the different quasar images. We find that the mass-to-light ratio of the lensing galaxies does not depend on radius, from inner galactic regions out to several half-light radii. Moreover, its value does not exceed the value predicted by stellar population models by more than a factor two, which may be explained by baryonic dark matter alone, without any need for exotic matter. Our results thus suggest that, if dark matter is present in early-type galaxies, its amount does not exceed the amount of luminous matter and its density follows that of luminous matter, in sharp contrast to what is found from rotation curves of spiral galaxies. [less ▲]

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See detailFAO Training in Crop Yield Forecasting. Crop Yield Forecasting Methodology Enhancement – Remote sensing. Erevan 21 - 25 January 2013.
Denis, Antoine ULg

E-print/Working paper (2013)

Power point presentation of the FAO training "Crop Yield Forecasting Methodology Enhancement – Remote sensing", held in Erevan, Armenia, 21 - 25 January 2013 at ARMSTATEHYDROMET. The main objective of ... [more ▼]

Power point presentation of the FAO training "Crop Yield Forecasting Methodology Enhancement – Remote sensing", held in Erevan, Armenia, 21 - 25 January 2013 at ARMSTATEHYDROMET. The main objective of this training was the improvement of the Crop Yield Forecasting System (CYFS) in Armenia by introducing a new approach for satellite data integration (use of TIMESAT software and METOP AVHRR NDVI images). This training was held in the framework of the "EC/FAO Programme on Information Systems to Improve Food Security Decision-Making in the European Neighbourhood Policy (ENP) East Area GCP/GLO/275/EC". [less ▲]

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

E-print/Working paper (2013)

This time, as habitually, we shall see some tricks: 2. Putting two itemizations on the same line, 3. Using footnotes in boxes, 4. Dealing with PDF cut-and-past and search functionalities, even when you ... [more ▼]

This time, as habitually, we shall see some tricks: 2. Putting two itemizations on the same line, 3. Using footnotes in boxes, 4. Dealing with PDF cut-and-past and search functionalities, even when you are using accented characters, 5. Making a distinction with \overline for propositional logic formulae, 6. Referring to \labels by long names. We will then discuss some problems people often face when dealing with many figures, and, more generally, floats, in reports. Finally, we will deal with a Beamer scheme which aims at using a single file for both a presentation, and the related report. [less ▲]

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See detailLa réforme du Conseil d’Etat semble désormais sur les rails
Donnay, Luc ULg

E-print/Working paper (2013)

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See detailL’écriture au présent de Thierry Horguelin
Demoulin, Laurent ULg

E-print/Working paper (2013)

Les notations prises sur le vif par Thierry Horguelin portent un regard singulier sur notre quotidien.

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See detail« Pourquoi une nouvelle traduction du Hobbit ? »
Dor, Juliette ULg

E-print/Working paper (2013)

Après la traduction française de Francis Ledoux, qui datait de 1969, les éditions Bourgois viennent de publier une nouvelle traduction du Hobbit, par Daniel Lauzon, plus proche de l'œuvre de Tolkien, plus ... [more ▼]

Après la traduction française de Francis Ledoux, qui datait de 1969, les éditions Bourgois viennent de publier une nouvelle traduction du Hobbit, par Daniel Lauzon, plus proche de l'œuvre de Tolkien, plus contemporaine aussi. [less ▲]

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See detailConnecting IT Governance with Sourcing Theory: IT Centralization, Consolidation, and Outsourcing in US State Governments
Markus, M. Lynne; Jacobson, Dax D.; Bui, Quang Neo et al

E-print/Working paper (2013)

This paper focuses on an apparent disconnect between the literatures on 1) the governance of IT decisions and the organization of IT activities inside organizations and 2) IT outsourcing decisions and IT ... [more ▼]

This paper focuses on an apparent disconnect between the literatures on 1) the governance of IT decisions and the organization of IT activities inside organizations and 2) IT outsourcing decisions and IT outsourcing governance arrangements between client organizations and IT service providers. We hypothesize that centralization of IT activities within organizations is a necessary precondition for outcomes such as IT consolidation (leading to large cost efficiencies) and outsourcing deals and possibly also for successful consolidation and outsourcing. We investigate this hypothesis through an exploratory, mixed-method investigation of changes in IT governance arrangements and outcomes in a single, well-defined population of organizations — the executive branches of US State governments. [less ▲]

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See detailÈve de Saint-Martin
Henneau, Marie-Elisabeth ULg

E-print/Working paper (2013)

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See detailPregnancy-Associated Glycoprotein A-62 kDa [Fragment] from Dama dama placenta - Accession number C0HJC7
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailPregnancy-Associated Glycoprotein B-56 kDa [Fragment] from Dama dama placenta - Accession number C0HJC8
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailPregnancy-Associated Glycoprotein C-39 kDa [Fragment] from Dama dama placenta - Accession number C0HJC9
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailPregnancy-Associated Glycoprotein D-56 kDa [Fragment] from Dama dama placenta - Accession number C0HJD0
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailAlpha-2-HS-glycoprotein [Fragment] from Dama dama placenta - Accession number C0HJD1
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailSerum albumin [Fragment] from Dama dama placenta - Accession number C0HJD2
Bériot, Mathilde ULg; Tchimbou Njanjo, Aline Flora; Barbato, Olimpia et al

E-print/Working paper (2013)

N-terminal microsequence obtained after purification and characterization of placental proteins in Dama dama (fallow deer). Proteins were submitted to SwissProt databank.

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See detailHealth Status, Disability and Retirement Incentives in Belgium
Jousten, Alain ULg; Perelman, Sergio ULg; Lefebvre, Mathieu ULg

E-print/Working paper (2013)

Many Belgian retire well before the statutory retirement age. Numerous exit routes from the labor force can be identified: old‐age pensions, conventional early retirement, disability insurance, and ... [more ▼]

Many Belgian retire well before the statutory retirement age. Numerous exit routes from the labor force can be identified: old‐age pensions, conventional early retirement, disability insurance, and unemployment insurance are the most prominent ones. We analyze the retirement decision of Belgian workers adopting an option value framework, and pay special attention to the role of health status. We estimate probit models of retirement using data from SHARE. The results show that health and incentives matter in the decision to exit from the labor market. Based on these results, we simulate the effect of potential reforms on retirement. [less ▲]

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See detailUnraveling electron acceleration mechanisms in Ganymede's space environment through N-S conjugate imagery of Jupiter's aurora
Grodent, Denis ULg; Bonfond, Bertrand ULg; Gérard, Jean-Claude ULg et al

E-print/Working paper (2013)

There is strong scientific interest in Ganymede (Jupiter's third Galilean moon) and its surrounding environment, which stems from the likely presence of a liquid water ocean underneath its icy crust and ... [more ▼]

There is strong scientific interest in Ganymede (Jupiter's third Galilean moon) and its surrounding environment, which stems from the likely presence of a liquid water ocean underneath its icy crust and from its internally driven magnetic field. The interaction of the latter with Jupiter's magnetospheric plasma and its magnetic field gives rise to a unique situation in our solar system implying a mini-magnetosphere embedded within a giant-magnetosphere. This interaction generates Ganymede's ultraviolet auroral footprint in Jupiter's atmosphere. We propose to investigate the strong auroral connection between Jupiter and Ganymede and the variable characteristics of Ganymede's magnetosphere with an innovative approach, taking advantage of the large scale north-south asymmetries of Jupiter's magnetic field. The results obtained for Ganymede will be compared with the case of small injected hot plasma bubbles observed by the Galileo spacecraft and whose size and location are similar to those of Ganymede's magnetosphere. HST is currently the sole instrument capable of obtaining this information which pins down the proposed mechanisms linking the source and sink regions of auroral particles in the giant planets' magnetospheres. [less ▲]

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See detailDénommer. Regards rhétoriques sur la terminologie linguistique
[ Lttr 13 ]; Badir, Sémir ULg; Polis, Stéphane ULg et al

E-print/Working paper (2013)

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See detailQuelle école pour tous ?
Crahay, Marcel ULg; Baye, Ariane ULg; Fagnant, Annick ULg et al

E-print/Working paper (2013)

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See detailJesuit Solemnities in the Southern Netherlands : Immersion and Experience
Delfosse, Annick ULg

E-print/Working paper (2013)

Detailed reference viewed: 13 (5 ULg)
See detailSome misunderstood or unknown LaTeX tricks (VI)
Merciadri, Luca ULg

E-print/Working paper (2012)

Customizing a document class is important in the LaTeX world. We will consider two examples of this using the lettre document class. Next, we will consider a small fraction of a bigger LaTeX problem: the ... [more ▼]

Customizing a document class is important in the LaTeX world. We will consider two examples of this using the lettre document class. Next, we will consider a small fraction of a bigger LaTeX problem: the details of character encoding. [less ▲]

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See detailDominique A trois fois
Demoulin, Laurent ULg

E-print/Working paper (2012)

Triple actualité pour Dominique A: un nouveau disque, une tournée de concerts, un livre dans lequel il réfléchit, de façon ouverte et nuancée, à la question de l'identité et des origines.

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See detailComoment Risk and Stock Returns
Lambert, Marie ULg; Hübner, Georges ULg

E-print/Working paper (2012)

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See detailNancy Huston, Urgence d'écrire
Dor, Juliette ULg

E-print/Working paper (2012)

CR de "Reflets dans un œil d'homme"

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See detailLes littératures selon Nicolas Ancion
Demoulin, Laurent ULg

E-print/Working paper (2012)

Compte rendu du roman de Nicolas Ancion "La Cravate de Simenon" paru dans une collection destinée à l'apprentissage du français.

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See detailRisk Horizon and Expected Market Returns
Hübner, Georges ULg; Lejeune, Thomas ULg

E-print/Working paper (2012)

The paper proposes an equilibrium asset pricing model that accounts of the incomplete information on returns distribution and investors' preferences. Only moments up to order four of unknown unconditional ... [more ▼]

The paper proposes an equilibrium asset pricing model that accounts of the incomplete information on returns distribution and investors' preferences. Only moments up to order four of unknown unconditional distribution can be observed, and the model does not impose that portfolio diversi fication or moments preference should hold. Using Chebyshev-type of inequalities, an intuitive risk measure (risk horizon) is introduced with reference to the speed of convergence of a security's mean return to its expectations. By an arbitrage argument, this risk measure is related to the horizon of treasury securities in a system of equations that allows the calibration of the model parameters using term structure information. In particular, the expected return on the market portfolio can be endogenously estimated inside this system. The model calibration on U.S. market data provides plausible parameters estimates and interesting cyclical patterns in the time series of the expected return. The empirical relevance of these estimates is examined with tests of statistical and economic predictive ability for stock excess returns. The results provide signi ficant evidence on the added value of the estimates when compared to popular predictors found in the literature (see a.o. Lettau and Ludvigson, 2001; Rapach and Wohar, 2006; Goyal and Welch, 2008). [less ▲]

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See detailVers une typologie de la réflexivité
Demoulin, Laurent ULg

E-print/Working paper (2012)

Il sera ici question de phénomènes réflexifs qui, au sein d’un texte littéraire, produisent des écarts sensibles et rompent le processus classique de la représentation du réel. Les cas rencontrés sont ... [more ▼]

Il sera ici question de phénomènes réflexifs qui, au sein d’un texte littéraire, produisent des écarts sensibles et rompent le processus classique de la représentation du réel. Les cas rencontrés sont étonnamment divers, tant en ce qui concerne leur structure que les effets produits. C’est pourquoi l’on se propose de les classer en six catégories distinctes : réflexivité autotélique, réflexivité poétique, réflexivité linguistique, réflexivité de l’énonciateur, réflexivité conative et réflexivité référentielle. [less ▲]

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See detailNEW CHALLENGES FOR 21ST CENTURY COMPETITION AUTHORITIES
Petit, Nicolas ULg

E-print/Working paper (2012)

This paper discusses challenges for competition authorities in the 21st century. Those challenges were identified on the basis of a statistical review of the articles published since January 2011 in five ... [more ▼]

This paper discusses challenges for competition authorities in the 21st century. Those challenges were identified on the basis of a statistical review of the articles published since January 2011 in five major antitrust law journals. The assumption underlying this literature review is that the topics that statistically attract the most the attention from contemporary antitrust scholars are those that will likely constitute the main challenges for 21st century competition authorities. [less ▲]

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See detailOrganizational and Institutional Arrangements for e-Government: A Preliminary Report on Contemporary IT Management Approaches in US State Governments
Markus, M. Lynne; Jacobson, Dax D.; Bui, Quang Neo et al

E-print/Working paper (2012)

The success of e-government is believed to depend in part on the organizational and institutional arrangements that governments enact for the management of their IT resources. This paper develops the ... [more ▼]

The success of e-government is believed to depend in part on the organizational and institutional arrangements that governments enact for the management of their IT resources. This paper develops the conceptualization of IT management arrangements by considering possible interactions between two dimensions — 1) the organization of IT activities and 2) control over decisions about IT activities (also known as governance) — for each of two categories of IT activities — 1) IT projects (such as website development) and 2) IT services (such as the operation of networks). In addition, the paper provides preliminary empirical evidence obtained from applying this expanded conceptualization in the context of American state governments. Many states appear to employ centralization of IT activities to offset decentralization of IT control and vice versa. Consequently, neither dimension alone provides a good characterization of governmental IT management arrangements. These findings have the potential to enhance our understanding of the barriers to, and enablers of, e-government success. [less ▲]

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See detailSummer 2012 & The Blues - Chicago Blues Festival , Juin 2012
Sacré, Robert ULg

E-print/Working paper (2012)

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See detailSocial Security, Ageing and Economic Integration
Artige, Lionel ULg; Dedry, Antoine; Pestieau, Pierre ULg

E-print/Working paper (2012)

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See detailThe EMES Approach of Social Enterprise in a Comparative Perspective
Defourny, Jacques ULg; Nyssens, Marthe

E-print/Working paper (2012)

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See detailSummer 2012 & The blues 2012 pt 2 - Aurora's Blues on the Fox, June 2012
Sacré, Robert ULg

E-print/Working paper (2012)

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See detailNotes éparses d'un lecteur enthousiaste
Demoulin, Laurent ULg

E-print/Working paper (2012)

Compte rendu de "Carnet de Corée", ouvrage de Serge Delaive, mêlant littérature et photographies au sujet de trois voyages effectués en Corée sur les traces de la mère de sa compagne.

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See detailDe nieuwe fiscale antimisbruikregel en de gevolgen voor vermogensplanning
Bourgeois, Marc ULg; Nollet, Aymeric ULg

E-print/Working paper (2012)

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See detailA New Shift-Share Method
Artige, Lionel ULg; Van Neuss, Leif ULg

E-print/Working paper (2012)

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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

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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: 61 (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 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 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 detailThe size and book-to-market effects revisited
Lambert, Marie ULg; Hübner, Georges ULg

E-print/Working paper (2012)

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See detailSOUTHERN BLUES NIGHT Heerlen, Hollande) 2012
Sacré, Robert ULg

E-print/Working paper (2012)

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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.

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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 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)

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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.

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

E-print/Working paper (2012)

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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 detailCinéma 3D: d'une révolution à l'autre
Thonon, Jonathan 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 detailCinq jalons de réflexion autour d’un projet de recherche
Badir, Sémir 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 detailSolvyns (François-Balthazar)
Vandersmissen, Jan ULg

E-print/Working paper (2012)

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

E-print/Working paper (2011)

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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 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 detailFESTIVAL INTERNATIONAL DE LAFAYETTE 2011 compte rendu
Sacré, Robert ULg

E-print/Working paper (2011)

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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)

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See detailThe changing face of disability insurance
Jousten, Alain ULg; Lefebvre, Mathieu ULg; Perelman, Sergio ULg

E-print/Working paper (2011)

Detailed reference viewed: 21 (3 ULg)