References of "E-prints/Working papers"      in Complete repository Arts & humanities   Archaeology   Art & art history   Classical & oriental studies   History   Languages & linguistics   Literature   Performing arts   Philosophy & ethics   Religion & theology   Multidisciplinary, general & others Business & economic sciences   Accounting & auditing   Production, distribution & supply chain management   Finance   General management & organizational theory   Human resources management   Management information systems   Marketing   Strategy & innovation   Quantitative methods in economics & management   General economics & history of economic thought   International economics   Macroeconomics & monetary economics   Microeconomics   Economic systems & public economics   Social economics   Special economic topics (health, labor, transportation…)   Multidisciplinary, general & others Engineering, computing & technology   Aerospace & aeronautics engineering   Architecture   Chemical engineering   Civil engineering   Computer science   Electrical & electronics engineering   Energy   Geological, petroleum & mining engineering   Materials science & engineering   Mechanical engineering   Multidisciplinary, general & others Human health sciences   Alternative medicine   Anesthesia & intensive care   Cardiovascular & respiratory systems   Dentistry & oral medicine   Dermatology   Endocrinology, metabolism & nutrition   Forensic medicine   Gastroenterology & hepatology   General & internal medicine   Geriatrics   Hematology   Immunology & infectious disease   Laboratory medicine & medical technology   Neurology   Oncology   Ophthalmology   Orthopedics, rehabilitation & sports medicine   Otolaryngology   Pediatrics   Pharmacy, pharmacology & toxicology   Psychiatry   Public health, health care sciences & services   Radiology, nuclear medicine & imaging   Reproductive medicine (gynecology, andrology, obstetrics)   Rheumatology   Surgery   Urology & nephrology   Multidisciplinary, general & others Law, criminology & political science   Civil law   Criminal law & procedure   Criminology   Economic & commercial law   European & international law   Judicial law   Metalaw, Roman law, history of law & comparative law   Political science, public administration & international relations   Public law   Social law   Tax law   Multidisciplinary, general & others Life sciences   Agriculture & agronomy   Anatomy (cytology, histology, embryology...) & physiology   Animal production & animal husbandry   Aquatic sciences & oceanology   Biochemistry, biophysics & molecular biology   Biotechnology   Entomology & pest control   Environmental sciences & ecology   Food science   Genetics & genetic processes   Microbiology   Phytobiology (plant sciences, forestry, mycology...)   Veterinary medicine & animal health   Zoology   Multidisciplinary, general & others Physical, chemical, mathematical & earth Sciences   Chemistry   Earth sciences & physical geography   Mathematics   Physics   Space science, astronomy & astrophysics   Multidisciplinary, general & others Social & behavioral sciences, psychology   Animal psychology, ethology & psychobiology   Anthropology   Communication & mass media   Education & instruction   Human geography & demography   Library & information sciences   Neurosciences & behavior   Regional & inter-regional studies   Social work & social policy   Sociology & social sciences   Social, industrial & organizational psychology   Theoretical & cognitive psychology   Treatment & clinical psychology   Multidisciplinary, general & others     Showing results 1 to 100 of 1048 1 2 3 4 5 6     How to account for new forms of resistance to domination: An argument for a materialist renewal in European social theoryFrère, Bruno ; Tulle, EmmanuelleE-print/Working paper (2019)Many significant intellectual developments have taken place in 20th century European social theories. Notably the first Frankfurt School and Bourdieu’s work have successfully shown how workers, social ... [more ▼]Many significant intellectual developments have taken place in 20th century European social theories. Notably the first Frankfurt School and Bourdieu’s work have successfully shown how workers, social actors, etc. are alienated or dominated by capitalist social structures. But according to Habermas, neither perspective successfully allows for the possibility that people could contribute to their own emancipation. The emergence of new forms of social resistance to domination such as those embodied by the Indignados, Anonymous, Femen, the practitioners of alternative economy, movements of unemployed people or illegals compels us to envisage the possibility for emancipation, but how? In this paper we explore opportunities for accounting for this by considering the work of a range of other European social theorists, more specifically Boltanski whose critical intent is embodied in his pragmatic sociology, and evident in his coining and use of the concept of the world. In addition we will consider Latour’s own pragmatic stance as we believe that despite his disinterest in new social movements, his work, informed by pure immanence, might offer potential solutions. But we would argue that even in these innovations there is either a persistent tendency to imagine emancipation primarily as a return to some ideal state or a lack of critical engagement with alienation. In response, we propose a materialist renewal, which will lead us to ponder on the political role of sociologists. [less ▲]Detailed reference viewed: 148 (11 ULiège) Housing the multitude: struggling with impermanence and singularitiesVan Rooyen, Xavier ; Bianchi, Michaël E-print/Working paper (2019)Since the financial crisis of 2008, architecture must face growing conditions of instability. This rekindles the necessity to integrate the parameter of uncertainty into architectural design much like the ... [more ▼]Since the financial crisis of 2008, architecture must face growing conditions of instability. This rekindles the necessity to integrate the parameter of uncertainty into architectural design much like the concerns developed by the radical architects of the 1960s. At that time, these architects associated with the Team X challenged the hegemonic claims of the modern theories and introduced new issues for architecture. They raised the questions of uncertainty, instability over time, and the growing importance of individualities, notably on the subject of the housing and its ability to integrate the inhabitant as an actor. They introduced concepts like the ‘aesthetics of change’ (Smithsons), the ‘open form’ (Hansen), ‘open aesthetic’ (Voelcker) and developed architectural theories regarding indétermination and fragmentation. Out of a synthesis of this theoretical background, we propose to withdraw a conceptual tool with which we review the approach of two contemporary architectural offices, particularly concerned by the question of housing for the great number and exploring notions of indeterminacy, uncertainty, open aesthetics and open structure in their achievements. Doing so, we aim to provide insights to engage with actual and future challenges in the field of housing architecture. [less ▲]Detailed reference viewed: 6 (0 ULiège) Landscape-like Architecture Hiroshi Senju Museum as An Alternative to PlacelessnessVan Rooyen, Xavier E-print/Working paper (2019)Detailed reference viewed: 13 (0 ULiège) Co-Housing: The Challenge of Shared Spaces within a Shared SocietyVan Rooyen, Xavier E-print/Working paper (2019)Detailed reference viewed: 13 (1 ULiège) Critical Time Windows for Renewable Resource Complementarity AssessmentBerger, Mathias ; Radu, David-Constantin ; Fonteneau, Raphaël et alE-print/Working paper (2018)This paper proposes a systematic framework to assess the complementarity of renewable resources over arbitrary geographical scopes and temporal scales which is particularly well-suited to exploit very ... [more ▼]This paper proposes a systematic framework to assess the complementarity of renewable resources over arbitrary geographical scopes and temporal scales which is particularly well-suited to exploit very large data sets of climatological data. The concept of critical time windows is introduced, and a spatio-temporal criticality indicator is proposed, consisting in a parametrised family of scalar indicators quantifying the complementarity between renewable resources in both space and time. The criticality indicator is leveraged to devise a family of optimisation problems identifying sets of locations with maximum complementarity under arbitrary geographical deployment constraints. The applicability of the framework is shown in a case study investigating the complementarity between the wind regimes in continental western Europe and southern Greenland, and its usefulness in a power system planning context is demonstrated. Besides showing that the occurrence of low wind power production events can be significantly reduced on a regional scale by exploiting diversity in local wind patterns, results highlight the fact that aggregating wind power production sites located on different continents may result in a lower occurrence of system-wide low wind power production events and indicate potential benefits of intercontinental electrical interconnections. [less ▲]Detailed reference viewed: 402 (16 ULiège) Complementarity Assessment of South Greenland Katabatic Flows and West Europe Wind RegimesRadu, David-Constantin ; Berger, Mathias ; Fonteneau, Raphaël et alE-print/Working paper (2018)Current global environmental challenges require firm, yet diverse resolutions in the energy sector. One promising solution consists in harnessing high-quality variable renewable energy (VRE) resources in ... [more ▼]Current global environmental challenges require firm, yet diverse resolutions in the energy sector. One promising solution consists in harnessing high-quality variable renewable energy (VRE) resources in remote locations, while using transmission links to wheel the power towards end users. In this context, a comparison of western Europe and Greenland wind regimes is proposed. By leveraging a regional atmospheric model with proven results in polar conditions, local climate associated with southern Greenland is identified to exhibit specific characteristics that facilitate extensive VRE generation levels. A methodology to assess the added value of wind harnessing in remote locations is introduced and applied on the aforementioned case study, showing superior and complementary wind generation potential in this region of Greenland with respect to selected European sites. [less ▲]Detailed reference viewed: 124 (13 ULiège) Do balanced words have a short period?Brauner, Nadia; Crama, Yves ; Delaporte, Etienne et alE-print/Working paper (2018)We conjecture that each balanced word on N letters - either arises from a balanced word on two letters by expanding both letters with a congruence word, - or is D-periodic with D <= 2^N-1. Our conjecture ... [more ▼]We conjecture that each balanced word on N letters - either arises from a balanced word on two letters by expanding both letters with a congruence word, - or is D-periodic with D <= 2^N-1. Our conjecture arises from extensive numerical experiments. It implies, for any fixed N, the finiteness of the number of balanced words on N letters which do not arise from expanding a balanced word on two letters. It refines a theorem of Graham and Hubert, which states that non-periodic balanced words are congruence expansions of balanced words on two letters. It also relates to Fraenkel's conjecture, which states that for N > 2, every balanced word with distinct densities d_1 > d_2 > ... > d_N satisfies d_i = 2^{N-i} / (2^N-1), since this implies that the word is D-periodic with D= 2^N-1. For N < 7, we provide a tentative list of the density vectors of balanced words which do not arise from expanding a balanced word with fewer letters. We prove that the list is complete for N=4 letters. We also prove that deleting a letter in a congruence word always produces a balanced word and this construction allows us to further reduce the list of density vectors that remains unexplained. Moreover, we prove that deleting a letter in an m-balanced word produces an (m+1)-balanced word, thus extending and simplifying a result of Sano et al. (2004). [less ▲]Detailed reference viewed: 15 (2 ULiège) Henry Clews: Twenty-Eight Years in Wall StreetChoffray, Jean-Marie E-print/Working paper (2018)Word of caution: I am happy to share my summary of one of the best books ever written on how financial markets function and professional investors/speculators behave. Some of the observations and ... [more ▼]Word of caution: I am happy to share my summary of one of the best books ever written on how financial markets function and professional investors/speculators behave. Some of the observations and inferences made by Henry Clews, more than one hundred years ago, may sometimes appear a bit crude, if not biased – specially to those of us who live on this side of the Atlantic! – but they don’t overshadow his honest desire to observe, understand and share financial markets history as it unfolds. I think that most of his comments and advices are perfectly relevant today in our digitalized investment environment. That’s why, under the influence of some of my past students, I finally decided to share my “personal” summary of this exceptional piece of work. If it leads you to read the 724 pages of the original, I will have done useful work. [less ▲]Detailed reference viewed: 94 (21 ULiège) La tranquille pénétration chinoise en Amérique latine et CaraïbesKellner, Thierry; Wintgens, Sophie E-print/Working paper (2018)En 2008, la République populaire de Chine (RPC) publiait son premier Policy Paper définissant stratégiquement ses relations avec l’Amérique latine et les Caraïbes (ALC). Depuis, en l’espace d’une décennie ... [more ▼]En 2008, la République populaire de Chine (RPC) publiait son premier Policy Paper définissant stratégiquement ses relations avec l’Amérique latine et les Caraïbes (ALC). Depuis, en l’espace d’une décennie, elle s’est affirmée comme un partenaire commercial et financier incontournable dans cette zone longtemps considérée comme l’arrière-cour de Washington. Pourtant, vus d’Europe, les intérêts et l’action de Pékin dans le sous-continent latino-américain restent encore largement méconnus, voire ignorés. Cet article a pour but d'en livrer un petit éclairage. [less ▲]Detailed reference viewed: 31 (5 ULiège) On the efficiency of decentralized decision-making in self-dispatch power systemsPetitet, Marie; Perrot, Marie; Mathieu, Sébastien et alE-print/Working paper (2018)This paper focuses on market design options for operational balancing management in self-dispatch electric power systems. In particular, it investigates the most relevant timing for the balancing gate ... [more ▼]This paper focuses on market design options for operational balancing management in self-dispatch electric power systems. In particular, it investigates the most relevant timing for the balancing gate closure, when competitors can no longer modify their decisions on the setting of controllable assets and when this responsibility is simultaneously transferred to the system operator. This discussion is central in the development and implementation of the European Electricity Balancing Guideline. Based on a multi-level simulation tool with a realistic modelling of short-term power system operations including informational asymmetry between market participants and the system operator, this paper proposes the first quantitative assessment of reducing the balancing gate closure time from one hour to 15 minutes ahead of the imbalance settlement period. For different environments (energy mix, power plant capabilities, outages, etc…), the results highlight that postponing the balancing gate closure time from one hour to 15 minutes increases the operational cost of the system. Based on robust and scalable results, we show that this difference is mainly due to a better coordination of the available resources by the central decision maker. [less ▲]Detailed reference viewed: 188 (6 ULiège) Style de citation 'Université de Liège - Droit' : Guide d'utilisationCordier, Quentin ; Desseilles, François E-print/Working paper (2018)Detailed reference viewed: 43 (10 ULiège) Une petite collection de livres d’emblèmesDe Marco, Rosa E-print/Working paper (2018)Detailed reference viewed: 21 (5 ULiège) Likelihood-free inference with an improved cross-entropy estimatorStoye, Markus; Brehmer, Johann; Louppe, Gilles et alE-print/Working paper (2018)We extend recent work (Brehmer, et. al., 2018) that use neural networks as surrogate models for likelihood-free inference. As in the previous work, we exploit the fact that the joint likelihood ratio and ... [more ▼]We extend recent work (Brehmer, et. al., 2018) that use neural networks as surrogate models for likelihood-free inference. As in the previous work, we exploit the fact that the joint likelihood ratio and joint score, conditioned on both observed and latent variables, can often be extracted from an implicit generative model or simulator to augment the training data for these surrogate models. We show how this augmented training data can be used to provide a new cross-entropy estimator, which provides improved sample efficiency compared to previous loss functions exploiting this augmented training data. [less ▲]Detailed reference viewed: 18 (2 ULiège) Social Security Incentives in Belgium:An Analysis of Four Decades of ChangeFraikin, Anne-Lore ; Jousten, Alain ; Lefebvre, Mathieu E-print/Working paper (2018)The paper traces labor market reforms over the last four decades. It provides estimates of retirement incentives for a selected set of typical worker profiles across time and socioeconomic groups and ... [more ▼]The paper traces labor market reforms over the last four decades. It provides estimates of retirement incentives for a selected set of typical worker profiles across time and socioeconomic groups and links these series to the labor market performance in Belgium. The results show that the numerous retirement and social security program reforms have had a marked impact on incentives at the micro level. At the aggregate level, results are less clear-cut given the extreme diversity of programs and features in the Belgian institutional context. [less ▲]Detailed reference viewed: 29 (6 ULiège) Do the rules shape the game ? SEP license negotiations in a changing European regulatory environmentBulkaert, Justine E-print/Working paper (2018)Detailed reference viewed: 24 (3 ULiège) Efficient Probabilistic Inference in the Quest for Physics Beyond the Standard ModelGunes Baydin, Atilim; Heinrich, Lukas; Bhimji, Wahid et alE-print/Working paper (2018)We present a novel framework that enables efficient probabilistic inference in large-scale scientific models by allowing the execution of existing domain-specific simulators as probabilistic programs ... [more ▼]We present a novel framework that enables efficient probabilistic inference in large-scale scientific models by allowing the execution of existing domain-specific simulators as probabilistic programs, resulting in highly interpretable posterior inference. Our framework is general purpose and scalable, and is based on a cross-platform probabilistic execution protocol through which an inference engine can control simulators in a language-agnostic way. We demonstrate the technique in particle physics, on a scientifically accurate simulation of the tau lepton decay, which is a key ingredient in establishing the properties of the Higgs boson. High-energy physics has a rich set of simulators based on quantum field theory and the interaction of particles in matter. We show how to use probabilistic programming to perform Bayesian inference in these existing simulator codebases directly, in particular conditioning on observable outputs from a simulated particle detector to directly produce an interpretable posterior distribution over decay pathways. Inference efficiency is achieved via inference compilation where a deep recurrent neural network is trained to parameterize proposal distributions and control the stochastic simulator in a sequential importance sampling scheme, at a fraction of the computational cost of Markov chain Monte Carlo sampling. [less ▲]Detailed reference viewed: 15 (1 ULiège) Deep generative models for fast shower simulation in ATLASThe ATLAS collaboration; Louppe, Gilles E-print/Working paper (2018)Detailed reference viewed: 82 (4 ULiège) Machine Learning in High Energy Physics Community White PaperAlbertsson, Kim; Altoe, Piero; Anderson, Dustin et alE-print/Working paper (2018)Machine learning is an important research area in particle physics, beginning with applications to high-level physics analysis in the 1990s and 2000s, followed by an explosion of applications in particle ... [more ▼]Machine learning is an important research area in particle physics, beginning with applications to high-level physics analysis in the 1990s and 2000s, followed by an explosion of applications in particle and event identification and reconstruction in the 2010s. In this document we discuss promising future research and development areas in machine learning in particle physics with a roadmap for their implementation, software and hardware resource requirements, collaborative initiatives with the data science community, academia and industry, and training the particle physics community in data science. The main objective of the document is to connect and motivate these areas of research and development with the physics drivers of the High-Luminosity Large Hadron Collider and future neutrino experiments and identify the resource needs for their implementation. Additionally we identify areas where collaboration with external communities will be of great benefit. [less ▲]Detailed reference viewed: 30 (4 ULiège) La desconfianza es la peor antivacunasJamoulle, Marc ; Pizzanelli, MiguelE-print/Working paper (2018)La cuestión de la vacunación contra el virus del papiloma humano, es por el momento, objeto de intensas discusiones. Uno podría pensar a primera vista que se trata de una cuestión puramente médica y, por ... [more ▼]La cuestión de la vacunación contra el virus del papiloma humano, es por el momento, objeto de intensas discusiones. Uno podría pensar a primera vista que se trata de una cuestión puramente médica y, por lo tanto, científica. Sin embargo no lo es. Veremos que se trata en primer lugar de una pregunta o problema de tipo sociológico, luego económico y político y finalmente de tipo científico. Este asunto es tan urticante que se le ha llamado “la primera guerra de vacunas” (1,2) Nuestro objetivo no es detallar la historia reciente de la vacuna, sino recordar algunos hechos interesantes. La protección de la población y los individuos ha sido siempre una de las preocupaciones de la medicina. Como los médicos lidian permanentemente con el tiempo, llegar antes de un evento es el objetivo de la prevención, a pesar de que los pacientes aún no estén enfermos o aún no se vean afectados por un daño potencial. Estamos hablando de prevención primaria. Las vacunas y el descubrimiento de la higiene del agua han sido uno de los descubrimientos históricos más importantes contra los eventos que han trastornado la esperanza de vida de los humanos. Pero es la naturaleza médica de la vacunación, sus aspectos protectores y preventivos que han afectado más a la población. [less ▲]Detailed reference viewed: 90 (1 ULiège) On the Stylized Fact of the Firm Size DistributionArtige, Lionel ; Reginster, Alexandre E-print/Working paper (2018)Detailed reference viewed: 39 (7 ULiège) Roland Barthes, moderne, antimoderne, postmoderne, après-moderne ?Demoulin, Laurent E-print/Working paper (2018)Tentative de réponse à Antoine Compagnon qui considère dans Les Antimodernes de Joseph de Maistre à Roland Barthes (Gallimard, coll. Bibliothèques des idées, 2005) que Roland Barthes est un penseur ... [more ▼]Tentative de réponse à Antoine Compagnon qui considère dans Les Antimodernes de Joseph de Maistre à Roland Barthes (Gallimard, coll. Bibliothèques des idées, 2005) que Roland Barthes est un penseur antimoderne. [less ▲]Detailed reference viewed: 30 (1 ULiège) ARGOS at the LBT. Binocular laser guided ground layer adaptive opticsRabien, S.; Angel, R.; Barl, L. et alE-print/Working paper (2018)Having completed its commissioning phase, the ARGOS ground layer adaptive optics facility is coming online for scientific observations at the Large Binocular Telescope, LBT. With six Rayleigh laser guide ... [more ▼]Having completed its commissioning phase, the ARGOS ground layer adaptive optics facility is coming online for scientific observations at the Large Binocular Telescope, LBT. With six Rayleigh laser guide stars in two constellations and the corresponding wavefront sensing, ARGOS corrects the ground layer distortions for both LBT 8.4 m eyes with its adaptive secondary mirrors. Under regular observing conditions, this setup delivers a PSF size reduction by a factor ~2-3, compared to a seeing limited operation. With the two LUCI infrared imaging and MOS spectroscopy instruments receiving the corrected images, observations in the near infrared can be performed at high spatial and spectral resolution. We will discuss the final ARGOS technical setup and the adaptive optics performances. With first scientific observations being conducted, we will show that imaging cases with GLAO are boosting several science programs from cluster CMD, Milky Way embedded star formation, to nuclei of nearby galaxies or extragalactic deep fields. In the unique combination of ARGOS with the multi-object near infrared spectroscopy available in LUCI over 4x4 arcmin field of view, first scientific observations have been performed on local and high-z objects. Those high spatial and spectral resolution observations demonstrate the capabilities now at hand with ARGOS at the LBT. [less ▲]Detailed reference viewed: 23 (7 ULiège) Terminologia multilingue in medicina di famiglia Versione 2.5 italianaJamoulle, Marc ; Demurtas, Jacopo; Pesolillo, Gabriella et alE-print/Working paper (2018)Detailed reference viewed: 27 (1 ULiège) Does Coriolis force influence the flow in shallow reservoirs?Dewals, Benjamin E-print/Working paper (2018)Detailed reference viewed: 19 (0 ULiège) Gradient Energy Matching for Distributed Asynchronous Gradient DescentHermans, Joeri ; Louppe, Gilles E-print/Working paper (2018)Distributed asynchronous SGD has become widely used for deep learning in large-scale systems, but remains notorious for its instability when increasing the number of workers. In this work, we study the ... [more ▼]Distributed asynchronous SGD has become widely used for deep learning in large-scale systems, but remains notorious for its instability when increasing the number of workers. In this work, we study the dynamics of distributed asynchronous SGD under the lens of Lagrangian mechanics. Using this description, we introduce the concept of energy to describe the optimization process and derive a sufficient condition ensuring its stability as long as the collective energy induced by the active workers remains below the energy of a target synchronous process. Making use of this criterion, we derive a stable distributed asynchronous optimization procedure, GEM, that estimates and maintains the energy of the asynchronous system below or equal to the energy of sequential SGD with momentum. Experimental results highlight the stability and speedup of GEM compared to existing schemes, even when scaling to one hundred asynchronous workers. Results also indicate better generalization compared to the targeted SGD with momentum. [less ▲]Detailed reference viewed: 16 (0 ULiège) Mining gold from implicit models to improve likelihood-free inferenceBrehmer, Johann; Louppe, Gilles ; Pavez, Juan et alE-print/Working paper (2018)Simulators often provide the best description of real-world phenomena; however, they also lead to challenging inverse problems because the density they implicitly define is often intractable. We present a ... [more ▼]Simulators often provide the best description of real-world phenomena; however, they also lead to challenging inverse problems because the density they implicitly define is often intractable. We present a new suite of simulation-based inference techniques that go beyond the traditional Approximate Bayesian Computation approach, which struggles in a high-dimensional setting, and extend methods that use surrogate models based on neural networks. We show that additional information, such as the joint likelihood ratio and the joint score, can often be extracted from simulators and used to augment the training data for these surrogate models. Finally, we demonstrate that these new techniques are more sample efficient and provide higher-fidelity inference than traditional methods. [less ▲]Detailed reference viewed: 18 (2 ULiège) Large-Scale Land Acquisitions for Agricultural Development in Myanmar: A Review of Past and Current ProcessesSan Thein; Diepart, Jean-Christophe ; Hlwan Moe et alE-print/Working paper (2018)Detailed reference viewed: 29 (2 ULiège) Les révolutionnaires, protecteurs du système ? Le Grand Soir est reporté à demainNossent, Jérôme E-print/Working paper (2018)En 1969, Georges Lavau, constitutionaliste et sociologue français, propose une analyse de la fonction du parti communiste français (PCF) dans une perspective systémique. Pour construire son modèle ... [more ▼]En 1969, Georges Lavau, constitutionaliste et sociologue français, propose une analyse de la fonction du parti communiste français (PCF) dans une perspective systémique. Pour construire son modèle d’analyse, il s’inspire de l’approche de David Easton, notamment concernant la définition donnée de ce qu’est un système politique. Dans le prolongement de David Easton, Georges Lavau considère qu’un parti politique peut ou non contribuer au maintien du système politique en fonction des rôles qu’il endosse (volontairement ou indépendamment de sa volonté, voire inconsciemment). Partant, cette fois-ci de la typologie de Théodore Lowi qui assigne deux fonctions possibles à un parti politique, légitimation et stabilisation du système politique, d’une part, soutien des politiques publiques d’autre part, Georges Lavau propose une troisième fonction : la fonction tribunitienne. [less ▲]Detailed reference viewed: 167 (1 ULiège) Constraining Effective Field Theories with Machine LearningBrehmer, Johann; Cranmer, Kyle; Louppe, Gilles et alE-print/Working paper (2018)We present powerful new analysis techniques to constrain effective field theories at the LHC. By leveraging the structure of particle physics processes, we extract extra information from Monte-Carlo ... [more ▼]We present powerful new analysis techniques to constrain effective field theories at the LHC. By leveraging the structure of particle physics processes, we extract extra information from Monte-Carlo simulations, which can be used to train neural network models that estimate the likelihood ratio. These methods scale well to processes with many observables and theory parameters, do not require any approximations of the parton shower or detector response, and can be evaluated in microseconds. We show that they allow us to put significantly stronger bounds on dimension-six operators than existing methods, demonstrating their potential to improve the precision of the LHC legacy constraints. [less ▲]Detailed reference viewed: 30 (1 ULiège) A Guide to Constraining Effective Field Theories with Machine LearningBrehmer, Johann; Cranmer, Kyle; Louppe, Gilles et alE-print/Working paper (2018)We develop, discuss, and compare several inference techniques to constrain theory parameters in collider experiments. By harnessing the latent-space structure of particle physics processes, we extract ... [more ▼]We develop, discuss, and compare several inference techniques to constrain theory parameters in collider experiments. By harnessing the latent-space structure of particle physics processes, we extract extra information from the simulator. This augmented data can be used to train neural networks that precisely estimate the likelihood ratio. The new methods scale well to many observables and high-dimensional parameter spaces, do not require any approximations of the parton shower and detector response, and can be evaluated in microseconds. Using weak-boson-fusion Higgs production as an example process, we compare the performance of several techniques. The best results are found for likelihood ratio estimators trained with extra information about the score, the gradient of the log likelihood function with respect to the theory parameters. The score also provides sufficient statistics that contain all the information needed for inference in the neighborhood of the Standard Model. These methods enable us to put significantly stronger bounds on effective dimension-six operators than the traditional approach based on histograms. They also outperform generic machine learning methods that do not make use of the particle physics structure, demonstrating their potential to substantially improve the new physics reach of the LHC legacy results. [less ▲]Detailed reference viewed: 26 (1 ULiège) Elite Taxi and Uber France : do Member States have free rein to prohibit and criminalise ridesharing activities?Van Cleynenbreugel, Pieter E-print/Working paper (2018)Detailed reference viewed: 27 (3 ULiège) Commuting within the EU? Take your Netflix content with you!Van Cleynenbreugel, Pieter E-print/Working paper (2018)Detailed reference viewed: 23 (1 ULiège) Customer ratings as a vector for discrimination in employment relations? Pathways and pitfalls for legal remediesDucato, Rossana; Kullmann, Miriam; Rocca, Marco E-print/Working paper (2018)The use of customer ratings to evaluate worker performance is increasingly worrisome because of its widespread use in the gig-economy. As scholars in computer and social sciences denounce, this practice ... [more ▼]The use of customer ratings to evaluate worker performance is increasingly worrisome because of its widespread use in the gig-economy. As scholars in computer and social sciences denounce, this practice entails the risk of producing discriminatory outcomes, by reproducing biases existing in society. By drawing an analogy with discriminatory practices adopted by an employer to satisfy its customers’ preferences, we propose a legal analysis of this phenomenon grounded in EU non-discrimination law. Thus, we first analyse the issues related to the application of non-discrimination law to (alleged) self-employed workers. Then, we address the lack of access for the individual worker to the data regarding customers’ ratings. We conclude by arguing that the use of customer ratings should be considered as a suspect criterion, while the current (EU) non-discrimination laws should be modernised through a clearer inclusion of (alleged) self-employed workers. [less ▲]Detailed reference viewed: 11 (2 ULiège) The effect of initial water distribution and spatial resolution on the interpretation of ERT monitoring of water infiltration in a landfill coverDumont, Gael; Pilaswki, Tamara; Hermans, Thomas et alE-print/Working paper (2018)Detailed reference viewed: 30 (7 ULiège) Guidelines related to the use of an existing cavity (mine/quarry) as reservoir of a pumped storage hydroelectric facilityCerfontaine, Benjamin ; Ronchi, Benedicta; Archambeau, Pierre et alE-print/Working paper (2018)Underground mines/quarries or open pits are manmade earthworks resulting from previous extraction of natural resources. They were mostly abandoned after resources depletion but underground or surface ... [more ▼]Underground mines/quarries or open pits are manmade earthworks resulting from previous extraction of natural resources. They were mostly abandoned after resources depletion but underground or surface excavations remain. Pumped Storage Hydroelectricity (PSH) is one of the only efficient solutions for large scale energy storage. During peaks of energy production, water is pumped from a lower reservoir to an upper reservoir. On the other hand when demand peaks, energy is generated when water is transferred to the lower reservoir. The objective of this work is to study the recovering of abandoned excavation volumes as lower reservoirs for pumped storage hydroelectricity. Underground Pumped Storage Hydroelectricity (UPSH) is a particular case where at least one of the reservoir lies below the surface. Compare to classical PSH plants, using an existing cavity as a reservoir raises three main additional problems: 1) What are the water movements and thus discharge availability at the pump/turbine location depending on the reservoir (complex) geometry? 2) What are the exchanges between the reservoir (usually not watertight) and the surrounding medium? 3) How can the reservoir sides resist to cyclic loading imposed by the plant operation? In the following, some simplified criteria and issues are provided to carry out feasibility assessments of such rehabilitation projects, from the existing reservoir point of view. These criteria do no replace a detailed and complete study but draws the attention on problems specific to PSH using existing cavities as reservoir. They do not concern problems existing for every PSH project, such as location of electricity transport lines, availability of water… [less ▲]Detailed reference viewed: 53 (4 ULiège) L’économie sur le sentier de la guerre : la bataille des normesWintgens, Sophie E-print/Working paper (2018)On entend souvent cette idée selon laquelle le monde se dérégularise mais en réalité, le monde a rarement connu une telle inflation de normes techniques, commerciales ou environnementales qui définissent ... [more ▼]On entend souvent cette idée selon laquelle le monde se dérégularise mais en réalité, le monde a rarement connu une telle inflation de normes techniques, commerciales ou environnementales qui définissent les règles de l'économie. Alors à quoi ressemble cette bataille entre puissances normatives? [less ▲]Detailed reference viewed: 41 (8 ULiège) Un mathématicien contemporain emblématique: Sir William Timothy GowersBair, Jacques E-print/Working paper (2018)William Timothy (ou simplement Tim) Gowers est un des meilleurs mathématiciens de cette époque. Au-delà des résultats mathématiques originaux et profonds qu’il a trouvés, il présente (au moins) quatre ... [more ▼]William Timothy (ou simplement Tim) Gowers est un des meilleurs mathématiciens de cette époque. Au-delà des résultats mathématiques originaux et profonds qu’il a trouvés, il présente (au moins) quatre particularités épistémologiques qui n’étaient pas encore d’actualité dans le passé et semblaient dès lors peu préoccuper les grands mathématiciens des siècles précédents, mais qui nous paraissent prises en compte par certains savants de la présente époque travaillant dans la direction tracée par T. Gowers. 1) Dans ses recherches mathématiques, il rapproche des théories mathématiques qui a priori semblent éloignées les unes des autres. 2) Il cherche à mieux faire comprendre les mathématiques à tous niveaux et contribue à la publication d’ouvrages de (haute) vulgarisation. 3) Il milite pour une science ouverte, en « open access ». 4) Il promeut une résolution collaborative de problèmes mathématiques ardus. [less ▲]Detailed reference viewed: 30 (2 ULiège) Les politiques de mémoire, dans quels buts?Nossent, Jérôme E-print/Working paper (2018)Une large question, fondamentale dans le cadre de nos sociétés contemporaines[4], est à l’origine des réflexions développées dans l’ouvrage : « À quoi servent les politiques de mémoire ? ». Les auteurs ... [more ▼]Une large question, fondamentale dans le cadre de nos sociétés contemporaines[4], est à l’origine des réflexions développées dans l’ouvrage : « À quoi servent les politiques de mémoire ? ». Les auteurs définissent ces dernières comme des « actions qui, pour agir sur la société et ses membres, et les transformer, mobilisent le rappel du passé » (Gensburger et Lefranc, 2017, 15). Sont ainsi interrogées les intentions des initiateurs de politiques de mémoire, celles des porteurs de mémoire susceptibles de rejoindre ces initiatives et enfin, dans une certaine mesure, les effets de ces politiques. [less ▲]Detailed reference viewed: 20 (3 ULiège) Seeking to regulate Uber? Why not rely on Article 101 TFEU...Van Cleynenbreugel, Pieter E-print/Working paper (2018)Detailed reference viewed: 27 (3 ULiège) Invest Smarter... One Thousand Tweets on the Art & Science of Internet-Based InvestingChoffray, Jean-Marie E-print/Working paper (2018)“Invest smarter…” I started this project two years ago. After several hundred hours of reading, thinking and writing, here they are: “One Thousand Tweets on The Art & Science of internet-Based Investing.” ... [more ▼]“Invest smarter…” I started this project two years ago. After several hundred hours of reading, thinking and writing, here they are: “One Thousand Tweets on The Art & Science of internet-Based Investing.” While producing them, my goal was to “show you the way”; to share my observations on the evolution of the world and the behavior of the financial markets; and, to illustrate the key heuristics that I learned over more than ten years, including the most recent, and turbulent, period. As, without any doubt, I am no Warren Buffett, feel free to disagree and develop you own theory of investing. Painful and solitary work... Success is at that price! And, based on what I did - and did not! - achieve, it shouldn’t be hard to do much better... That’s my wish for you! [less ▲]Detailed reference viewed: 414 (98 ULiège) Aphorismes mathématiques de J. EllenbergBair, Jacques E-print/Working paper (2018)J. S. Ellenberg est un des meilleurs mathématiciens de notre temps. Il a écrit un livre remarquable intitulé en anglais "How not to be wrong", traduit en français sous le titre "L'art de ne pas dire n ... [more ▼]J. S. Ellenberg est un des meilleurs mathématiciens de notre temps. Il a écrit un livre remarquable intitulé en anglais "How not to be wrong", traduit en français sous le titre "L'art de ne pas dire n'importe quoi". D'après l'auteur, " il voulait expliquer aux gens, en détail, combien les maths sont fantastiques". Nous reprenons dans cette note quelques extraits qui nous semblent contenir des idées profondes et pertinentes à propos des mathématiques, de leur enseignement et de leur heuristique (c'est-à-dire la façon de les trouver); nous les appelons des "aphorismes mathématiques". [less ▲]Detailed reference viewed: 12 (0 ULiège) Review of urban flood experimental models and preliminary design of a laboratory setup of urban floodingLi, Xuefang ; Erpicum, Sébastien ; Archambeau, Pierre et alE-print/Working paper (2018)In this study, we will investigate a study on an urban flood experimental model. Firstly, a literature review of urban flood experimental models is addressed to summarize the studies in this sector ... [more ▼]In this study, we will investigate a study on an urban flood experimental model. Firstly, a literature review of urban flood experimental models is addressed to summarize the studies in this sector (Section 2). Next, a strategy of experimental model design will be proposed (section 3.1). Particularly, we are interested in analyzing the influence of model distortion to the flow characteristics (Section 3) and the effect of the interaction between surface flow and underground space (Section 4). [less ▲]Detailed reference viewed: 65 (15 ULiège) Le phénomène interrégional dans le Global South: quel cadre conceptuel pour une réalité empirique plurielle? Le cas du dialogue afro-sud- américain.Mvengou Cruzmerino, Martine Colette E-print/Working paper (2018)La mise en place de dynamiques interrégionales dans le Global South a participé à la mutation de la physionomie de la scène internationale dès le début du XXIe siècle, offrant ainsi aux régions du Sud de ... [more ▼]La mise en place de dynamiques interrégionales dans le Global South a participé à la mutation de la physionomie de la scène internationale dès le début du XXIe siècle, offrant ainsi aux régions du Sud de nouveaux espaces de socialisation et de dialogue. Par ailleurs, ces interactions interrégionales Sud-Sud renvoient à une réalité empirique plurielle dont l’étude reste marginalisée au sein de la littérature sur l’interregionalisme. Dès lors, la présente contribution s’interroge sur l’usage et la pratique qui est fait de l’espace inter régional dans le Global South et questionne la mise en place d’un cadre conceptuel capable de mettre en lumière les différents enjeux et logiques qui structurent lesdits processus ineterregionaux. En soulignant le paradoxe épistémologique qui caractérise l’analyse des processus interrégionaux au Sud, à savoir le fait de rassembler des réalités plurielles et à la fois de manquer de cadre d’analyse susceptible d’aborder les enjeux de cet usage spécifique, cette contribution se penche sur le cas des relations interrégionales afro-sud-américaines. Ainsi, à partir de cette étude de cas, il est présenté une approche éclectique qui vise à intégrer le concept de Coopération Sud-Sud dans l’étude desdits processus notamment à travers la notion d’interrégionalisme Sud-Sud. [less ▲]Detailed reference viewed: 25 (3 ULiège) Equilibrium selection and stability in dynamic core-periphery models with heterogeneous preferencesDelloye, Justin; Peeters, Dominique; Tharakan, Joseph E-print/Working paper (2018)Detailed reference viewed: 18 (5 ULiège) Law, New Technologies & Artificial Intelligence. Session 2: Regulation of dataMansvelt, Valérie E-print/Working paper (2018)After a general presentation of the context data and privacy regulation by Christian D’Cunha, the different speakers covering this course discussed the main grounds of the GDPR (Laurent De Muyter ) as ... [more ▼]After a general presentation of the context data and privacy regulation by Christian D’Cunha, the different speakers covering this course discussed the main grounds of the GDPR (Laurent De Muyter ) as well as other relevant legislation for data regulation followed by some study cases (Inge Graef ). The importance of regulation of data is undeniable, as it is at the core of artificial intelligence (A.I.). Indeed, it requires big amounts of various data and the velocity of data. The most personal the data is, the most valuable it is. This collect of data is made possible by an increasing amount of connected devices. Therefore, there is security issues that arise (risk of hacking and losing data for example). This course aims at giving a better understanding of the scope of the various regulatory instruments. [less ▲]Detailed reference viewed: 59 (6 ULiège) Towards a Typology of Business Models in the Biotechnology IndustrySegers, Jean Pierre E-print/Working paper (2018)The purpose of this paper is to identify a selection of key business models - “typology” - applied in the biotechnology industry. The focus is on the differences between traditional/closed or stand-alone ... [more ▼]The purpose of this paper is to identify a selection of key business models - “typology” - applied in the biotechnology industry. The focus is on the differences between traditional/closed or stand-alone business models opposed to open or networked business models. A number of illustrative case studies and good practices are presented to show that new biotechnology firms are gradually adopting a “best of both worlds” strategy, with both closed business models and open, networked models as a way for gaining access to the market, in close collaboration with large global pharmaceutical companies. The case firms and good practices are taken from a recent country study for Belgium. [less ▲]Detailed reference viewed: 39 (9 ULiège) Smart Equity Investing: Implementing Risk Optimization Techniques on Strategic Beta PortfoliosFays, Boris ; Lambert, Marie ; Nicolas, PapageorgiouE-print/Working paper (2018)We examine the performance of risk-optimization techniques on equity style portfolios. To form these portfolios, also called Strategic Beta factors by practitioners and data providers, we group stocks ... [more ▼]We examine the performance of risk-optimization techniques on equity style portfolios. To form these portfolios, also called Strategic Beta factors by practitioners and data providers, we group stocks based on size, value and momentum characteristics through either independent or dependent sorting. Overall, performing risk-oriented strategies on style portfolios constructed with a dependent sort deliver greater abnormal returns. On average, we observe these strategies to significantly outperform 42% of the risk-oriented ETFs listed on US exchanges, compared to 31% when the risk-oriented strategies are performed on portfolios formed with an independent sort. We attribute the outperformance yielded by dependent sorting to the fact that it provides a better stratification of the set of stocks’ opportunity and diversification properties. [less ▲]Detailed reference viewed: 68 (8 ULiège) The First Post-Kepler Brightness Dips of KIC 8462852Boyajian, Tabetha S.; Alonso, Roi; Ammerman, Alex et alE-print/Working paper (2018)We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started ... [more ▼]We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in October 2015, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1-2.5% dips, named "Elsie," "Celeste," "Skara Brae," and "Angkor", which persist on timescales from several days to weeks. Our main results so far are: (i) there are no apparent changes of the stellar spectrum or polarization during the dips; (ii) the multiband photometry of the dips shows differential reddening favoring non-grey extinction. Therefore, our data are inconsistent with dip models that invoke optically thick material, but rather they are in-line with predictions for an occulter consisting primarily of ordinary dust, where much of the material must be optically thin with a size scale <<1um, and may also be consistent with models invoking variations intrinsic to the stellar photosphere. Notably, our data do not place constraints on the color of the longer-term "secular" dimming, which may be caused by independent processes, or probe different regimes of a single process. [less ▲]Detailed reference viewed: 22 (5 ULiège) Early 2017 observations of TRAPPIST-1 with $\textit{Spitzer}$Delrez, Laetitia; Gillon, Michaël ; Triaud, Amaury H. M. J. et alE-print/Working paper (2018)The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth ... [more ▼]The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding of these planets' compositions, energy budgets, and dynamics, we are carrying out an intensive photometric monitoring campaign of their transits with the $\textit{Spitzer Space Telescope}$. In this context, we present 60 new transits of the TRAPPIST-1 planets observed with $\textit{Spitzer}$/IRAC in February and March 2017. We combine these observations with previously published $\textit{Spitzer}$ transit photometry and perform a global analysis of the resulting extensive dataset. This analysis refines the transit parameters and provides revised values for the planets' physical parameters, notably their radii, using updated properties for the star. As part of our study, we also measure precise transit timings that will be used in a companion paper to refine the planets' masses and compositions using the transit timing variations method. TRAPPIST-1 shows a very low level of low-frequency variability in the IRAC 4.5-$\mu$m band, with a photometric RMS of only 0.11$\%$ at a 123-s cadence. We do not detect any evidence of a (quasi-)periodic signal related to stellar rotation. We also analyze the transit light curves individually, to search for possible variations in the transit parameters of each planet due to stellar variability, and find that the $\textit{Spitzer}$ transits of the planets are mostly immune to the effects of stellar variations. These results are encouraging for forthcoming transmission spectroscopy observations of the TRAPPIST-1 planets with the $\textit{James Webb Space Telescope}$. [less ▲]Detailed reference viewed: 79 (3 ULiège) Afrique du Sud, les défis énergétiques et miniers d'un pays émergentMerenne-Schoumaker, Bernadette E-print/Working paper (2018)Premier pays du continent africain par son développement économique, l’Afrique du Sud n’en est pas moins confrontée à plusieurs défis économiques parmi lesquels les secteurs de l’énergie et du minier ... [more ▼]Premier pays du continent africain par son développement économique, l’Afrique du Sud n’en est pas moins confrontée à plusieurs défis économiques parmi lesquels les secteurs de l’énergie et du minier occupent une place de choix. En effet, le pays est fortement dépendant du charbon qui engendre différents problèmes économiques, sociaux et environnementaux. Le premier défi est de diversifier le mix énergétique et de réussir la transition énergétique nationale. Le second défi est économique et social : alors que le secteur minier joue un rôle majeur (2016 : 7,3 % du PIB national, plus de 455 000 emplois directs), il est en difficulté depuis trois ans. Sa relance est d’autant plus importante que le pays est menacé par la récession et que le taux de chômage progresse et dépasse actuellement 27 %. A travers l’analyse des défis énergétiques et miniers du pays, l’article tente non seulement de dresser un bilan des problèmes rencontrés par les deux secteurs mais encore de leurs potentialités et de pistes pour l’avenir. Le cas de l’Afrique du Sud est ainsi assez exemplaire des défis auxquels doit faire face un pays émergent, même si celui-ci est un BRICS. [less ▲]Detailed reference viewed: 29 (1 ULiège) Afgelopen decennium 21% meer Waalse leerlingen in het Vlaamse secundair onderwijsProesmans, Maxim E-print/Working paper (2018)Detailed reference viewed: 33 (5 ULiège) jerome.pelenc@gmail.comPelenc, Jerome; Frère, Bruno ; Wallenborn, J et alE-print/Working paper (2018)The goal of this commentary is to bring to the forefront four majors ideas/hypotheses to stimulate the debate regarding sustainability transitions: (i) we argue that “local environmental resistances” (the ... [more ▼]The goal of this commentary is to bring to the forefront four majors ideas/hypotheses to stimulate the debate regarding sustainability transitions: (i) we argue that “local environmental resistances” (the environmental justice movement) and “local economic/community alternatives” (the Transition, degrowth and alike movements) constitute the two faces of the same coin i.e. “the great transition toward sustainability” when transition is considered from a citizen, place-based and socio-political perspective; (ii) we argue that both of these two global decentralized movements are place-based, they are participating in the emergence of a place-based alterglobalism. Then, the role of place in creating spaces of re-politicization through opposition and experimentation should be acknowledged and more researched; (iii) if resistances and alternatives share some features in common, they also present differences that should be further investigated regarding their empowerment and politicization potential; and (iv) last but not the least, we stress the need for a more incarnated, politicized and place-based approach to “sustainability transitions” thus distancing us from the Transition Management approach. [less ▲]Detailed reference viewed: 81 (1 ULiège) Antoinette DesmoulinsPiront, Julie E-print/Working paper (2018)Detailed reference viewed: 17 (0 ULiège) L’Histoire: un déterminant des comportements électorauxNossent, Jérôme E-print/Working paper (2018)Dans son « Étude électorale de certaines structure ou caractéristiques historiques », Marcel Hotterbeex propose une analyse des relations pouvant être établies entre les caractéristiques historiques ou ... [more ▼]Dans son « Étude électorale de certaines structure ou caractéristiques historiques », Marcel Hotterbeex propose une analyse des relations pouvant être établies entre les caractéristiques historiques ou cultuelles de certaines communes belges et les résultats électoraux dans celles-ci. Cette étude s’inscrit dans une réflexion plus large concernant les résultats de partis régionaux et la conscience régionaliste des populations. [less ▲]Detailed reference viewed: 157 (18 ULiège) A Multi-agent Simulator to Assess the Impact of Regulatory Frameworks on the Interaction between Consumers and Distribution System OperatorManuel de Villena Millan, Miguel ; Ernst, Damien ; Gautier, Axel et alE-print/Working paper (2018)This paper proposes a simulation-based methodology for evaluating the effectiveness of various regulatory frameworks promoting the large-scale deployment of decentralised electricity generation resources ... [more ▼]This paper proposes a simulation-based methodology for evaluating the effectiveness of various regulatory frameworks promoting the large-scale deployment of decentralised electricity generation resources (DERs) in distribution systems. Electricity consumers, prosumers, and the distribution system operator (DSO) are modelled as agents interacting with each other in an artificial environment which encapsulates the salient features of realistic regulatory frameworks, along with a set of assumptions on DER technology availability, performance, and costs. More precisely, the methodology enables to simulate the interactions between those agents in a great variety of environments in order to study the progressive deployment of DER as a function of its profitability, and also shows how this deployment impacts the remuneration mechanism of the DSO and the evolution of the distribution tariff. The methodology is illustrated on a case study considering 16 different regulatory environments and using data for Belgian DSOs. [less ▲]Detailed reference viewed: 40 (6 ULiège) ‘Crossovers’ in the Flemish education system: An exploratory studyProesmans, Maxim E-print/Working paper (2018)Detailed reference viewed: 55 (13 ULiège) « Proudhon, le premier pragmatiste? Petite histoire de l’autre sociologie »Frère, Bruno E-print/Working paper (2018)Detailed reference viewed: 46 (6 ULiège) From justification to phenomenology The moral Imaginary of Solidarity EconomyFrère, Bruno E-print/Working paper (2018)Detailed reference viewed: 34 (1 ULiège) How to account for new forms of resistance to domination: An argument for a materialist renewal in European Social TheoryFrenchFrère, Bruno E-print/Working paper (2018)Detailed reference viewed: 25 (2 ULiège) « Politics without politics » in solidarity economy Towards a libertarian grammar of the anti-globalisation movementFrère, Bruno E-print/Working paper (2018)Detailed reference viewed: 26 (2 ULiège) Beyond Critical Sociology Bourdieu’s Positivism and the Sociology of CritiqueFrère, Bruno ; Jaster, DanE-print/Working paper (2018)The aim of this paper is to demonstrate the value of French sociology of critique as a post-Bourdieusian critical sociology. We first show why this sociological paradigm correctly highlights positivistic ... [more ▼]The aim of this paper is to demonstrate the value of French sociology of critique as a post-Bourdieusian critical sociology. We first show why this sociological paradigm correctly highlights positivistic elements within the Bourdieuian paradigm. Bourdieu’s epistemological barrier between scientists and ordinary actors implies that critical sociologists’ judgments are scientifically true and must be distinguished from the latter’s own understandings of his/her action. This is epistemologically and normatively unsound due to the scientist’s own position within the social milieu. We then propose that critical scholars adopt the sociology of critique approach. This takes actors’ understandings of motivations and actions seriously, minimizing the distance between sociologists’ and actors’ understandings of the social world, better representing people’s social reality. This richer, more reflexive portrait of social life places social scientists in an advantageous position to understand and critically engage with the individuals and communities whom we study. [less ▲]Detailed reference viewed: 50 (4 ULiège) The Sociology of Critique Toward a Grammatical Approach of Action. The case of civic disobedience.Frère, Bruno ; Cervera-Marzal, ManuelE-print/Working paper (2018)Detailed reference viewed: 21 (1 ULiège) Solidarity economy and its anarchist grammarFrère, Bruno E-print/Working paper (2018)‘Solidarity economy’, a widely used term for which the most common French equivalent is economie solidaire, is generally thought of as comprising five distinct classes of activity : Micro-finance, Local ... [more ▼]‘Solidarity economy’, a widely used term for which the most common French equivalent is economie solidaire, is generally thought of as comprising five distinct classes of activity : Micro-finance, Local Exange Trading Systems, proximity services, organic community supported agriculture and fairtrade distributions. Because they try to answer to the Aristotelian theoretical question “what can we do to live harmoniously together?”, these solidarity initiatives are deeply political in the philosophical sense of the term. They galvanize civic commitment at the “micro” level. But today, an important question arises regarding the kind of formal political institution that would speak in the name of all these initiatives. In France, some intellectuals who have an interest in these solidarity initiatives see them as new economic models with the potential to solve the current financial crisis, and they are eager for academic specialists and leaders of the movement to achieve some kind of consensus about the kind of concrete political identity such initiatives may be expected to generate. However this paper studies their way of establishing a basis for moving from micro level initiatives to substantial “macro” polity unity. Using the insights of french pragmatic sociology, and particularly the notion of grammar of justification, it aims to understand what the obstacles to this aim being realised are. [less ▲]Detailed reference viewed: 104 (4 ULiège) Gamma Trading Skills in Hedge FundsFays, Boris ; Hübner, Georges ; Lambert, Marie E-print/Working paper (2018)This paper explores the gamma trading, timing and managerial skills of individual hedge funds across categories. We replicate the non-linear payoffs of hedge funds with traded options, with the option ... [more ▼]This paper explores the gamma trading, timing and managerial skills of individual hedge funds across categories. We replicate the non-linear payoffs of hedge funds with traded options, with the option features being endogenously defined in our replication model. On top of providing a flexible tool to create individual benchmarks for the payoff curvature of hedge fund, the model helps assigning hedge fund styles into three categories: directional with market timing skills, non-directional and market timers. Overall, our empirical results show that, on 30% of replicated funds in our sample (10,958 funds), there is no evidence of the presence of selection skills once a fund performance is adjusted with respect to the option-based benchmark and the traditional option-based factors of Agarwal and Naik (2004). This research has an incremental potential to stimulate additional research in the field of hedge funds performance replication through passive strategies. [less ▲]Detailed reference viewed: 68 (6 ULiège) Factoring Characteristics into Returns: A Clinical Approach to Fama-French Portfolio DecompositionLambert, Marie ; Fays, Boris ; Hübner, Georges E-print/Working paper (2018)This paper thoroughly analyzes competing construction methods for factoring characteristics into returns. We show the importance of ensuring a proper diversification of the factor's portfolio constituents ... [more ▼]This paper thoroughly analyzes competing construction methods for factoring characteristics into returns. We show the importance of ensuring a proper diversification of the factor's portfolio constituents for producing relevant and unbiased risk factors or benchmark portfolios. This is an important issue to be solved for asset pricing and performance models defined as a function of characteristics. As a practical case, the paper works on the design of size and value spread portfolios à la Fama-French. This quasi- clinical investigation examines three methodological choices that have an impact on portfolio diversification: the (in)dependence and the (a)symmetry of the stock sorting procedure, and the sorting breakpoints. A sequential and symmetric sort of stocks into long and short portfolios conditioned on control variables produces unbiased factors. Our results are stronger when whole firm samples are used to define breakpoints and are also robust to the inclusion of a third dimension in the multiple sorting. [less ▲]Detailed reference viewed: 64 (3 ULiège) Estimation from cross-sectional data under a semiparametric truncation modelDe uña Alvarez, Jacobo; Heuchenne, Cédric ; Laurent, GéraldineE-print/Working paper (2018)Detailed reference viewed: 15 (3 ULiège) Nonparametric regression with cross-sectional data: an alternative to conditional product-limit estimatorsHeuchenne, Cédric ; Laurent, GéraldineE-print/Working paper (2018)Detailed reference viewed: 14 (4 ULiège) PV adoption in Wallonia: The role of distribution tariffs under net meteringGautier, Axel ; Jacqmin, Julien E-print/Working paper (2018)The deployment of decentralized productions units (DPU) like rooftop solar panels is a major challenge for energy transition. Under a net metering system where the meter runs backward when there is ... [more ▼]The deployment of decentralized productions units (DPU) like rooftop solar panels is a major challenge for energy transition. Under a net metering system where the meter runs backward when there is excessive PV production, the electricity produced is valued at the retail price. Higher retail prices thus encourage the deployment of DPU. In this paper, we study the impact of tariffs on the decision to install residential solar PV installations. We analyze a panel data from Wallonia, where tariffs depend largely from volumetric charges. We exploit the presence of 13 different grid operators with different tariffs, to disentangle this relationship. Using various specifications, our results suggest that a one eurocent per kWh of tariff increase leads to, all else equal, an increase of around 5% in the number of new installations. [less ▲]Detailed reference viewed: 106 (10 ULiège) "L'enfance d'Ivan" d'Andrei Tarkovski: premier germe d'une dissidence?Thirion, Nicolas E-print/Working paper (2018)Detailed reference viewed: 40 (13 ULiège) Prioritization vs zero-rating: Discrimination on the internetGautier, Axel ; Somogyi, RobertE-print/Working paper (2018)This paper analyzes two business practices on the mobile internet market, paid prioritization and zero-rating. Both violate the principle of net neutrality by allowing the internet service provider to ... [more ▼]This paper analyzes two business practices on the mobile internet market, paid prioritization and zero-rating. Both violate the principle of net neutrality by allowing the internet service provider to discriminate different content types. In recent years these practices have attracted considerable media attention and regulatory interest. The EU, and until recently the US have banned paid prioritization but tolerated zero-rating under conditions. With prioritization, the ISP delivers content at different speeds and it is equivalent to a discrimination in terms of quality. With zero-rating, the ISP charges different prices for content and it is equivalent to a discrimination in terms of prices. We first show that neither of these practices lead to the exclusion of a content provider, a serious concern of net neutrality advocates. The ISP chooses prioritization when traffic is highly valuable for content providers and congestion is severe, and zero-rating in all other cases. Furthermore, investment in network capacity is suboptimal in the case of prioritization and socially optimal under zero-rating. [less ▲]Detailed reference viewed: 43 (4 ULiège) Generation of Parallel Corpus for Low Resource Language TranslationTrieu, Long Hai; Ittoo, Ashwin E-print/Working paper (2018)Detailed reference viewed: 20 (1 ULiège) Decidability of the isomorphism and the factorization between minimal substitution subshiftsDurand, F.; Leroy, Julien E-print/Working paper (2018)Detailed reference viewed: 18 (2 ULiège) Stein characterizations for linear combinations of gamma random variablesArras, Benjamin; Azmoodeh, Ehsan; Poly, Guillaume et alE-print/Working paper (2018)Detailed reference viewed: 18 (1 ULiège) Stein operators, kernels and discrepancies for multivariate continuous distributionsMijoule, Guillaume; Reinert, Gesine; Swan, Yvik E-print/Working paper (2018)Detailed reference viewed: 21 (1 ULiège) Assessing and predicting review helpfulness: Critical review, open challenges and research agendaHoffait, Anne-Sophie ; Ittoo, Ashwin ; Schyns, Michael E-print/Working paper (2018)The issues of determining what makes a customer review helpful and how to predict review helpfulness have received significant attention in recent years. However, the current literature is highly ... [more ▼]The issues of determining what makes a customer review helpful and how to predict review helpfulness have received significant attention in recent years. However, the current literature is highly heterogeneous with contradictory findings. We critically synthesize extant literature and identify factors responsible for these contradictions which we classify into four dimensions, viz. datasets, features, approach and review helpfulness operationalization, and clarify the prevailing confusion. We highlight research gaps, and propose novel research directions to bridge them and to advance the state-of-the-art. We provide resources such as synthetic tables, which summarize past research and develop a (future) research roadmap. These resources not only provide a concise overview of current research, but also illustrate its heterogeneity and serve as a valuable basis to ground future research. [less ▲]Detailed reference viewed: 34 (3 ULiège) Use of high-resolution seismic reflection data in the paleogeographical reconstruction of shallow Lake Yamanaka (Fuji Five Lakes, Japan)Lamair, Laura ; Hubert, Aurelia ; Yamamoto, S. et alE-print/Working paper (2018)High-resolution seismic profiles combined with the integration of published drilling data provide a detailed paleoenvironmental history of Lake Yamanaka (Fuji Five Lakes, Japan). This study presents a ... [more ▼]High-resolution seismic profiles combined with the integration of published drilling data provide a detailed paleoenvironmental history of Lake Yamanaka (Fuji Five Lakes, Japan). This study presents a detailed analysis of different depositional stages of the current Lake Yamanaka (floodplain wetland, river and lake). From ca. 5500 cal yr BP to ca. 5050 cal yr BP, the Yamanaka Basin was occupied by floodplain wetlands. During that period, the landscape was very stable and the erosion on northeastern flank of Mt. Fuji was relatively limited. From ca. 5050 cal yr BP to ca. 3050 cal yr BP, the water level increased and the floodplain wetlands became a lake. From ca. 3050 cal yr BP to ca. 2050 cal yr BP, water level decreased progressively leading to a reduction of lake extension. During the lowering of lake water level, a 1 km2 mass-transport deposit modified the physiography of the lakefloor. From ca. 2050 cal yr BP to ca. 1050 cal yr BP, the lake disappeared and the depression was occupied by a river flowing toward the northwest. Morphological lows formed by mass-transport deposit were occupied by ponds. From ca. 1050 cal yr BP to present day, the lake water rose again connecting the pond with the main lake. Since then, lake water level continues to rise up to the current lake water level. Lake water level fluctuations are the results of several factors that could be concomitant: (i) change in precipitation rate; (ii) margin destabilization (the Yamanaka MTD); (iii) change in river inlets and therefore variation of water supplies; (iv) volcanic eruptions (scoria fall-out and lava flows); (v) change in vegetation cover. This study highlights the importance of coupling sediment cores and high-resolution seismic reflection profiling to identify lateral change and modification of the sedimentary inputs through time. [less ▲]Detailed reference viewed: 33 (3 ULiège) Numerical investigation on the seismic performance of aqueduct bridge structures: application to the Antioch on the Orontes Aqueduct (Antakya, Turkey)Lamair, Laura ; Hubert, Aurelia ; Degée, Hervé et alE-print/Working paper (2018)Seismic shaking can damage building, especially historical structures which were not designed with building codes. Here we focus on Roman aqueduct bridge structures, which remains can be found all over ... [more ▼]Seismic shaking can damage building, especially historical structures which were not designed with building codes. Here we focus on Roman aqueduct bridge structures, which remains can be found all over the Mediterranean area, a highly seismic region. We developed simple models using a finite element software to realize static and dynamic linear analyses of these structures when they are subject to imposed ground motion. The effects of basic variations in the pier-arch architectural design and in the type of material used were investigated. We identified two main weak zones: the arch extremities and the bottom part of the piers. The damage occurrence in these two areas could be attributed to earthquake shaking. Our first-order vulnerability analysis also points to different ways to enhance the structure stability: building narrow arches, adding buttress zones and using bricks which are light materials. Finally, we also investigated the vulnerability to seismic shaking of a real case example, the Antioch on the Orontes Aqueduct in Harbiye (Turkey). The aqueduct shows different stages of constructions, damage areas and repairs. The modeling suggests that the observed damages were the results of earthquake shaking. The repairs reinforced the structure and stabilized it pointing to the adaptive technology and skills of the roman engineers. [less ▲]Detailed reference viewed: 43 (4 ULiège) Extended main sequence turn-off originating from a broad range of stellar rotational velocitiesLim, Beomdu; Rauw, Grégor ; Nazé, Yaël et alE-print/Working paper (2018)Detailed reference viewed: 40 (2 ULiège) La Couverture universelle en santé au Sahel : la situation au Mali et au Sénégal en 2018Deville, Céline ; Hane, Fatoumata; Ridde, Valéry et alE-print/Working paper (2018)Detailed reference viewed: 20 (1 ULiège) Late Holocene changes on erosion pattern on a lacustrine environment: landscape stabilization by volcanic activity versus human activityLamair, Laura ; Hubert, Aurelia ; El Ouhabi, Meriam et alE-print/Working paper (2018)Lacustrine sediments are particularly sensitive to modi cations within the lake catch- ment. In a volcanic area, sedimentation rates are directly a ected by the history of the volcano and its eruptions ... [more ▼]Lacustrine sediments are particularly sensitive to modi cations within the lake catch- ment. In a volcanic area, sedimentation rates are directly a ected by the history of the volcano and its eruptions. Here, we investigate the impact of Mt. Fuji Volcano (Japan) on Lake Motosu and its watershed. The lacustrine in ll is studied by combining seismic re ec- tion pro les and sediment cores. We show evidence of changes in sedimentation patterns during the depositional history of Lake Motosu. The frequency of large mass-transport de- posits recorded within the lake decreases over the Holocene. Before 8000 cal yr BP, large sublacustrine landslides and turbidites were lling the lacustrine depression. After 8000 cal yr BP, only one large sublacustrine landslide was recorded. The change in sedimentation pattern coincides with a change in sediment accumulation rate. Over the last 8000 cal yrs BP, the sediment accumulation rate was not su cient enough to produce large sublacustrine slope failures. Consequently, the frequency of large mass-transport deposits decreased and only turbidites resulting from sur cial slope reworking occurred. These constitute the main sedimentary in ll of the deep basin. We link the change in sediment accumulation rate with (i) climate and vegetation changes; and (ii) the Mt. Fuji eruptions which a ected the Lake Motosu watershed by reducing its size and strongly modi ed its topography. Moreover, this study highlights that the deposition of turbidites in the deep basin of Lake Motosu is mainly controlled by the paleobathymetry of the lake oor. Two large mass-transport deposits, oc- curring around 8000 cal yr BP and 2000 cal yr BP, modi ed the paleobathymetry of the lake oor and therefore, changed the turbidite depositional pattern of Lake Motosu. [less ▲]Detailed reference viewed: 55 (7 ULiège) Compact quadratizations for pseudo-Boolean functionsBoros, Endre; Crama, Yves ; Rodriguez Heck, Elisabeth E-print/Working paper (2018)The problem of minimizing a pseudo-Boolean function, that is, a real-valued function of 0-1 variables, arises in many applications. A quadratization is a reformulation of this nonlinear problem into a ... [more ▼]The problem of minimizing a pseudo-Boolean function, that is, a real-valued function of 0-1 variables, arises in many applications. A quadratization is a reformulation of this nonlinear problem into a quadratic one, obtained by introducing a set of auxiliary binary variables. A desirable property for a quadratization is to introduce a small number of auxiliary variables. We present upper and lower bounds on the number of auxiliary variables required to define a quadratization for several classes of specially structured functions, such as functions with many zeros, symmetric, exact k-out-of-n, at least k-out-of-n and parity functions, and monomials with a positive coefficient, also called positive monomials. Most of these bounds are logarithmic in the number of original variables, and we prove that they are best possible for several of the classes under consideration. For positive monomials and for some other symmetric functions, a logarithmic bound represents a significant improvement with respect to the best bounds previously published, which are linear in the number of original variables. Moreover, the case of positive monomials is particularly interesting: indeed, when a pseudo-Boolean function is represented by its unique multilinear polynomial expression, a quadratization can be obtained by separately quadratizing its monomials. [less ▲]Detailed reference viewed: 29 (5 ULiège) Improvements to Inference Compilation for Probabilistic Programming in Large-Scale Scientific SimulatorsLezcano Casado, Mario; Gunes Baydin, Atilim; Martinez Rubio, David et alE-print/Working paper (2017)We consider the problem of Bayesian inference in the family of probabilistic models implicitly defined by stochastic generative models of data. In scientific fields ranging from population biology to ... [more ▼]We consider the problem of Bayesian inference in the family of probabilistic models implicitly defined by stochastic generative models of data. In scientific fields ranging from population biology to cosmology, low-level mechanistic components are composed to create complex generative models. These models lead to intractable likelihoods and are typically non-differentiable, which poses challenges for traditional approaches to inference. We extend previous work in "inference compilation", which combines universal probabilistic programming and deep learning methods, to large-scale scientific simulators, and introduce a C++ based probabilistic programming library called CPProb. We successfully use CPProb to interface with SHERPA, a large code-base used in particle physics. Here we describe the technical innovations realized and planned for this library. [less ▲]Detailed reference viewed: 14 (1 ULiège) Recovery of unlawful tax advantages remains a thorny EU State aid law issueVan Cleynenbreugel, Pieter E-print/Working paper (2017)A blogpost on State aid and tax rulings, as a contribution to the Regulating for Globalization blogDetailed reference viewed: 17 (0 ULiège) Performance sharing in risky portfolios: The case of hedge fund returns and feesLambert, Marie ; Hübner, Georges E-print/Working paper (2017)Institutional investors face different types of leverage and short-sale restrictions that alter competition in the asset management industry. This distortion enables high-risk unconstrained investors (e.g ... [more ▼]Institutional investors face different types of leverage and short-sale restrictions that alter competition in the asset management industry. This distortion enables high-risk unconstrained investors (e.g., equity long/short hedge fund managers) to extract additional income from constrained institutional investors. Using a sample of 1,938 long/short equity hedge funds spanning 15 years, we show that high-volatility funds deliver lower net-of-fees Sharpe ratios than do their low-volatility peers; furthermore, the managers of these funds usually charge higher fees. This evidence can be interpreted as a situational rent extraction or as compensation for the service of enhancing market functioning. [less ▲]Detailed reference viewed: 44 (2 ULiège) Seeking the Best Fundamental Risk Factors: A Clinical Approach to Fama-French Portfolio DecompositionLambert, Marie ; Fays, Boris ; Hübner, Georges E-print/Working paper (2017)This paper performs a thorough analysis of competing construction methods for the design of size (SMB) and value (HML) spread portfolios à la Fama-French. This quasi-clinical investigation of ... [more ▼]This paper performs a thorough analysis of competing construction methods for the design of size (SMB) and value (HML) spread portfolios à la Fama-French. This quasi-clinical investigation of methodological choices uncovers substantial differences in the capacity of estimated premiums to translate stock characteristics into returns. A sequential sort of stocks into long and short portfolios conditioned on control variables (“pre-conditioning”) produces factors that best reflect the corresponding fundamental attributes. Our results are stronger when using the whole firm sample to define breakpoints and a triple sort, which ensures the same diversification (in terms of number of firms) across the characteristic-sorted portfolios forming the long and short legs of the factor. Our results are robust to the inclusion of the momentum dimension in the multiple sorting. The best method produces a volatile and insignificant size premium, but a high and stable value premium. [less ▲]Detailed reference viewed: 101 (3 ULiège) The Excitements & Penniman RecordsSacré, Robert E-print/Working paper (2017)Interviews des membres des Excitements , de Koko Jean Davis et d'Enric Bosser ( Penniman Records) - Record reviewsDetailed reference viewed: 18 (1 ULiège) Le chemin de Jacques STOTZEMSacré, Robert E-print/Working paper (2017)Interview de Jacques Stotzem au sujet de son 15è album "The Way To Go" ; toutes les compositions sont originales.Detailed reference viewed: 15 (0 ULiège) Law, Cognitive Technologies & Artificial Intelligence. Session 1 : Introduction to A.I. and RegulationMansvelt, Valérie E-print/Working paper (2017)This session, at the Brussels School of Cognitive Technologies and Law, aims at giving meaning to the conceptual and practical impact of cognitive technologies and artificial intelligence (A.I.). The ... [more ▼]This session, at the Brussels School of Cognitive Technologies and Law, aims at giving meaning to the conceptual and practical impact of cognitive technologies and artificial intelligence (A.I.). The point is not to provide answers but questions. This first session is a general session on Law and artificial intelligence with two representatives from the private and public sector. Bjoern Juretzki is a policy official in the EU working especially on A.I. in the development of policies at the European commission level. Jonathan Sage is a representative of the private sector who works for the Government and Regulatory Affairs at IBM. Nicolas Petit, Professor of Law at ULiège and a Research Professor at the School of Law of the University of South Australia, gave some context on the technologies and their legal implication. [less ▲]Detailed reference viewed: 46 (6 ULiège) Neural Message Passing for Jet PhysicsHenrion, Isaac; Brehmer, Johann; Bruna, Joan et alE-print/Working paper (2017)Detailed reference viewed: 11 (1 ULiège) China’s new relations with Panama and Costa Rica are another step towards a Beijing Consensus in Central AmericaWintgens, Sophie E-print/Working paper (2017)Increased trade, aid, investment, and diplomatic engagement between China and both Costa Rica and Panama signal a more general projection of Chinese economic and political standards in international trade ... [more ▼]Increased trade, aid, investment, and diplomatic engagement between China and both Costa Rica and Panama signal a more general projection of Chinese economic and political standards in international trade policy. [less ▲]Detailed reference viewed: 52 (5 ULiège) A comparative study of labeling algorithms for vehicle routing problems with time windows and waiting time costsMichelini, Stefano ; Arda, Yasemin ; Küçükaydın, HandeE-print/Working paper (2017)Detailed reference viewed: 53 (19 ULiège) Velléités d’indépendance, remise en question par les armes, guerres civiles : l’État semble de plus en plus contesté et menacé. Qu’en est-il vraiment ?Wintgens, Sophie ; Weerts, Audrey E-print/Working paper (2017)Dans un grand nombre d’études menées depuis plus d’une vingtaine d’années, la question de la place et du contrôle de l’État est formulée en termes de « crise ». Comment l’État du XXIe siècle fait-il face ... [more ▼]Dans un grand nombre d’études menées depuis plus d’une vingtaine d’années, la question de la place et du contrôle de l’État est formulée en termes de « crise ». Comment l’État du XXIe siècle fait-il face aux pressions internationales (terrorisme, mondialisation, flux migratoires) et aux menaces internes (référendums d’indépendance, guerres civiles, ingérence étrangère)? "L’État dans tous ses états", un ouvrage collectif (publié chez Peter Lang en Belgique) dirigé par deux chercheuses belges, Sophie Wintgens et Audrey Weerts, essaie de répondre aux questions soulevées par l’actualité par des réflexions théoriques et des études de cas. Sophie Wintgens est chargée de recherches du Fonds de la recherche scientifique (FRS-FNRS) au Centre d’étude de la vie politique (CEVIPOL) de l’Université libre de Bruxelles, maître de conférences au département de science politique de l’Université de Liège et chercheuse associée au Center for International Relations Studies (CEFIR). Audrey Weerts est assistante et chargée de recherches au sein de la Cellule d’appui politologique Afrique-Caraïbes et de l’unité d’étude des systèmes politiques belges à l’Université de Liège. Toutes les deux expliquent à Middle East Eye que loin d’être une entité statique et figée, l’État se développe et se transforme, et reste encore pour l’instant un acteur central du système international. [less ▲]Detailed reference viewed: 17 (6 ULiège) SiSTEM, a Model for the Simulation of Short-Term Electricity MarketsMathieu, Sébastien; Petitet, Marie; Perrot, Marie et alE-print/Working paper (2017)The aim of this document is to present SiSTEM, a multi-level simulation model of European short-term electricity markets, covering day-ahead and intraday exchanges to balancing activations in real-time ... [more ▼]The aim of this document is to present SiSTEM, a multi-level simulation model of European short-term electricity markets, covering day-ahead and intraday exchanges to balancing activations in real-time, and imbalance settlement. In this model, power companies interact by making offers, notifying their positions to the system operator and impacting the balance of the electric system. The system operator activates balancing energy to restore the balance of the system, using all balancing activation offers, including from balancing reserves. Imbalance settlement implies bidirectional transactions between the system operator and power companies depending on the direction of their imbalance. A simulation of the model is performed by sequentially considering each time step and simulating actors’ decisions. The objective of this model is to understand the problems behind decisions of the actors within the short-term electrical system operation, to provide insights on how these problems can be solved through market design and to see how the decisions are linked together to shape a coherent system. This paper presents different simulation cases of an illustrative system in order to portray main features of the model in a practical and effective manner. In particular, the results show the importance of considering steady-state constraints and notice delays of generation units when looking at short-term issues. Future works could use this model to provide quantitative assessments of short-term market designs. [less ▲]Detailed reference viewed: 740 (21 ULiège) The Science Case for an Extended Spitzer MissionYee, Jennifer C.; Fazio, Giovanni G.; Benjamin, Robert et alE-print/Working paper (2017)Although the final observations of the Spitzer Warm Mission are currently scheduled for March 2019, it can continue operations through the end of the decade with no loss of photometric precision. As we ... [more ▼]Although the final observations of the Spitzer Warm Mission are currently scheduled for March 2019, it can continue operations through the end of the decade with no loss of photometric precision. As we will show, there is a strong science case for extending the current Warm Mission to December 2020. Spitzer has already made major impacts in the fields of exoplanets (including microlensing events), characterizing near Earth objects, enhancing our knowledge of nearby stars and brown dwarfs, understanding the properties and structure of our Milky Way galaxy, and deep wide-field extragalactic surveys to study galaxy birth and evolution. By extending Spitzer through 2020, it can continue to make ground-breaking discoveries in those fields, and provide crucial support to the NASA flagship missions JWST and WFIRST, as well as the upcoming TESS mission, and it will complement ground-based observations by LSST and the new large telescopes of the next decade. This scientific program addresses NASA's Science Mission Directive's objectives in astrophysics, which include discovering how the universe works, exploring how it began and evolved, and searching for life on planets around other stars. [less ▲]Detailed reference viewed: 30 (1 ULiège) SPECULOOS exoplanet search and its prototype on TRAPPISTBurdanov, Artem ; Delrez, Laetitia; Gillon, Michaël et alE-print/Working paper (2017)One of the most significant goals of modern science is establishing whether life exists around other suns. The most direct path towards its achievement is the detection and atmospheric characterization of ... [more ▼]One of the most significant goals of modern science is establishing whether life exists around other suns. The most direct path towards its achievement is the detection and atmospheric characterization of terrestrial exoplanets with potentially habitable surface conditions. The nearest ultracool dwarfs (UCDs), i.e. very-low-mass stars and brown dwarfs with effective temperatures lower than 2700 K, represent a unique opportunity to reach this goal within the next decade. The potential of the transit method for detecting potentially habitable Earth-sized planets around these objects is drastically increased compared to Earth-Sun analogs. Furthermore, only a terrestrial planet transiting a nearby UCD would be amenable for a thorough atmospheric characterization, including the search for possible biosignatures, with near-future facilities such as the James Webb Space Telescope. In this chapter, we first describe the physical properties of UCDs as well as the unique potential they offer for the detection of potentially habitable Earth-sized planets suitable for atmospheric characterization. Then, we present the SPECULOOS ground-based transit survey, that will search for Earth-sized planets transiting the nearest UCDs, as well as its prototype survey on the TRAPPIST telescopes. We conclude by discussing the prospects offered by the recent detection by this prototype survey of a system of seven temperate Earth-sized planets transiting a nearby UCD, TRAPPIST-1. [less ▲]Detailed reference viewed: 29 (1 ULiège) Affaires C-168/16 & C-169/16 : for compétent dans le secteur du transport aérien de passagersCordier, Quentin E-print/Working paper (2017)Detailed reference viewed: 40 (8 ULiège) Rapport sur l’égalité entre les femmes et les hommes à l’Université de Liège 2017- rapport genre 2017Cornet, Annie E-print/Working paper (2017)this report present the statistical data of University de Liège (student and personal) for the year 2016-2017. Similar report in 2016 and 2014.Detailed reference viewed: 99 (16 ULiège) A Simulator to Explore Tarification Designs for Distribution NetworksManuel de Villena Millan, Miguel ; Gautier, Axel ; Fonteneau, Raphaël et alE-print/Working paper (2017)This paper introduces a computational tool to help assess the impact of regulation policies within distribution net- works in the deployment of distributed renewable electricity generation. This tool is a ... [more ▼]This paper introduces a computational tool to help assess the impact of regulation policies within distribution net- works in the deployment of distributed renewable electricity generation. This tool is a comprehensive multi-agent simulator capable of handling the interaction between the users of a distribution network and their distribution system operator. With this simulator, it is possible to address the different regulatory constraints encountered by distribution system operators, for any regulation policy. In the simulator, we model individual electricity consumers as rational agents, who may invest in optimised distributed renewable energy installations, if they are cost-efficient compared to the network tariff. By modelling the cost recovery scheme of the distribution system operator, the simulator then computes the evolution of the network tariff in response to a change in the consumption and generation of the consumers in the distribution network, due to the deployment of distributed generation. The simulator is illustrated with various regulation policies. [less ▲]Detailed reference viewed: 134 (34 ULiège) The EP’s ‘European Standards’ Resolution in the wake of James Elliott Construction: carving ever more holes in Pandora’s Box?Van Cleynenbreugel, Pieter ; Demoulin, Iris E-print/Working paper (2017)This blogpost analyses a recent Parliamentary resolution against the background of the Court of Justice's James Elliott Construction judgment, dealing with the legal nature of harmonised technical ... [more ▼]This blogpost analyses a recent Parliamentary resolution against the background of the Court of Justice's James Elliott Construction judgment, dealing with the legal nature of harmonised technical standards in EU free movement law. [less ▲]Detailed reference viewed: 30 (0 ULiège) ‘Once Upon A Time’ ou le contrôle de la narrationClaisse, Frédéric ; Huppe, Justine E-print/Working paper (2017)Ce billet de blog analyse les liens entre "ELIPSIA", une série de court-métrages réalisée par Frédéric DARRAS entre 2012 et 2016, et le projet de recherche STORYFIC, consacré aux effets du storytelling ... [more ▼]Ce billet de blog analyse les liens entre "ELIPSIA", une série de court-métrages réalisée par Frédéric DARRAS entre 2012 et 2016, et le projet de recherche STORYFIC, consacré aux effets du storytelling sur l'écriture de fiction contemporaine, et plus particulièrement aux pouvoirs de la fiction. Après avoir décrit les enjeux posés par la série, l'article développe une série de parallèles avec les préoccupations d'auteurs français contemporains (C. Delaume, C. de Toledo, P. Vasset, A. Damasio), qui nourrissent le même rapport ambivalent à la fiction: à la fois dénoncée pour son emprise sur nos existences et son caractère aliénant, mais aussi valorisée pour ses promesses de réappropriation et d'émancipation. [less ▲]Detailed reference viewed: 48 (1 ULiège)