References of "First made available on ORBi"      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 386 1 2 3 4     L’imperium et les auspices du préfet d’Égypte : une innovation ? Précédents et enjeux d’un imperium ad similitudinem proconsulisBerthelet, Yann E-print/Working paper (in press)Detailed reference viewed: 21 (1 ULiège) Informal fatigue-related risk management in the emergency department: a trade-off between doing well and feeling well?Berastegui, Pierre ; Jaspar, Mathieu ; Ghuysen, Alexandre et alE-print/Working paper (in press)The effect of shift work on health and safety has long been a concern of public authorities, and increasingly stringent directives have been issued over the past decades. However, there are evidences that ... [more ▼]The effect of shift work on health and safety has long been a concern of public authorities, and increasingly stringent directives have been issued over the past decades. However, there are evidences that current directives still represent a hazard in some work settings by disturbing the sleep/wake regulation processes. Emergency physicians are known to be particularly vulnerable to sleep deprivation due to inconsistent shift rotation, extended duty periods and overnight calls. However, naturalistic studies have actually failed to systematically demonstrate that sleep deprivation is associated with poorer work performance in emergency physicians. The inconsistency of these results could reside in physicians’ ability to compensate for fatigue-related impairments. Our aim is to identify informal fatigue management strategies used by emergency physicians and to assess the efficiency in terms of fatigue, work performance and associated risks for physician burnout. We conducted a prospective longitudinal study with 28 emergency physicians for a total of 182 shifts. At enrolment, participants answered the Maslach Burnout Inventory and the Fatigue Management Survey. During shifts, we measured fatigue using the Psychomotor Vigilance Task and work performance using an adapted version of the Physician Achievement Review. Our results show that emergency physicians working at this public sector hospital use different types of compensatory strategies to manage fatigue-related risk, and that some of these strategies might result in a trade-off between work performance and occupational burnout. We propose further considerations for the implementation and follow-up of a fatigue risk management system in the emergency department. [less ▲]Detailed reference viewed: 33 (3 ULiège) Fatigue-related risk perception among emergency physicians working extended shifts.Berastegui, Pierre ; Jaspar, Mathieu ; Ghuysen, Alexandre et alE-print/Working paper (in press)There is a growing body of studies indicating that extended shift duration has an adverse effect on fatigue, consequently leading to reduced work performance and higher risk of accident. Following modern ... [more ▼]There is a growing body of studies indicating that extended shift duration has an adverse effect on fatigue, consequently leading to reduced work performance and higher risk of accident. Following modern fatigue risk management systems (FRMS), acceptable performance could be maintained by the mobilization of appropriate mitigation strategies. However, the effective deployment of such strategies assume that workers are able to assess their own level of fatigue-related impairments. In this study, we sought to determine whether emergency physicians’ subjective feelings of sleepiness could provide accurate knowledge of actual fatigue-related impairments while working extended shifts. We conducted a prospective observational study with a within-subjects repeated measures component. We collected sleep logs, sleepiness ratings and reaction times on a Psychomotor Vigilance Task (PVT) at different time points during shifts. Our results show that the PVT is sensitive to sleep loss and fatigue, with a 10% increase in mean reaction time across the shift. Subjective sleepiness, however, showed no significant association with time since awakening and was not a significant predictor of PVT performance. Our results are consistent with experimental studies showing that individuals tend to underestimate fatigue-related impairments when sleep deprived or functioning under adverse circadian phase. The discrepancy between subjective sleepiness and actual fatigue-related impairments may give workers the illusion of being in control and hinder the deployment of mitigation strategies. Further research is needed to determine the relative weight of circadian phase shifting and cumulative sleep deprivation in the decline of self-knowledge in extended shifts. [less ▲]Detailed reference viewed: 22 (3 ULiège) From justification to phenomenology The moral Imaginary of Solidarity EconomyFrère, Bruno E-print/Working paper (2020)Detailed reference viewed: 38 (1 ULiège) Beyond Critical Sociology Bourdieu’s Positivism and the Sociology of CritiqueFrère, Bruno ; Jaster, DanE-print/Working paper (2020)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: 85 (6 ULiège) Interest rate differentials and the dynamic asymmetry of exchange ratesHambuckers, Julien ; Ulm, MarenE-print/Working paper (2019)In this paper, we revisit the predictive content of interest rates for daily exchange rate returns, taking into account dependencies of higher orders. In particular, we allow for time-varying asymmetries ... [more ▼]In this paper, we revisit the predictive content of interest rates for daily exchange rate returns, taking into account dependencies of higher orders. In particular, we allow for time-varying asymmetries in the distribution of exchange rates. Then, we study the USD/EUR currency pair over the period 1999-2019. We find a dynamic asymmetry component to be significant and driven by interest rate differentials, but also by general uncertainty and past unexpected shocks. In line with recent currency crash theories, our study suggests that the high yield currency is more likely to appreciate, but is exposed to a higher likelihood of currency crashes. To assess the economic significance of our results, we introduce a directional forecasting approach derived from our model. We show that a trading rule based on these forecasts provides better in-sample and out-of-sample economic performance compared to benchmark models. [less ▲]Detailed reference viewed: 23 (3 ULiège) The Role of Power-to-Gas and Carbon Capture Technologies in Cross-Sector Decarbonisation StrategiesBerger, Mathias ; Radu, David-Constantin ; Fonteneau, Raphaël et alE-print/Working paper (2019)This paper proposes an optimisation-based framework to tackle long-term centralised planning problems of multi-sector, integrated energy systems including electricity, hydrogen, natural gas, synthetic ... [more ▼]This paper proposes an optimisation-based framework to tackle long-term centralised planning problems of multi-sector, integrated energy systems including electricity, hydrogen, natural gas, synthetic methane and carbon dioxide. The model selects and sizes the set of power generation, energy conversion and storage as well as carbon capture technologies minimising the cost of supplying energy demand in the form of electricity, hydrogen, natural gas or synthetic methane across the power, heating, transportation and industry sectors whilst accounting for policy drivers, such as energy independence, carbon emissions reductions targets, or support schemes. The usefulness of the model is illustrated in a case study evaluating the potential of sector coupling via power-to-gas and carbon capture technologies to achieve deep decarbonisation targets in the Belgian context. Results, on the one hand, indicate that power-to-gas can only play a minor supporting role in cross-sector decarbonisation strategies in Belgium, as electrolysis plants are generally deployed in moderate quantities whilst methanation plants do not appear in any studied scenario. On the other hand, given the limited renewable potential, post-combustion and direct air carbon capture technologies clearly play an enabling role in any decarbonisation strategy. [less ▲]Detailed reference viewed: 261 (14 ULiège) La longue et fascinante épopée de la vaccinationGeenen, Vincent E-print/Working paper (2019)Vaccination is still today the greatest victory of medicine against most of infectious diseases, and this triumph was acquired only after a long history that started hundred of years ago. Nevertheless ... [more ▼]Vaccination is still today the greatest victory of medicine against most of infectious diseases, and this triumph was acquired only after a long history that started hundred of years ago. Nevertheless, irrational anti-vaccination movements emerged worldwide during recent years and are now one of the ten major threats against public healthcare according to a recent report of the World Health Organization (WHO). More than ever, it is essential to inform with honesty and integrity our citizens about the safety and efficiency of current available vaccines. [less ▲]Detailed reference viewed: 31 (3 ULiège) Data requirements for computational modelling at the network levelDewals, Benjamin ; Erpicum, Sébastien ; Pirotton, Michel et alE-print/Working paper (2019)Detailed reference viewed: 19 (6 ULiège) Authentic ecology as an advanced stage of technological civilizationde Salle, Corentin; Ernst, Damien E-print/Working paper (2019)Detailed reference viewed: 19 (4 ULiège) Templates for the k-binomial complexity of the Tribonacci wordLejeune, Marie ; Rigo, Michel ; Rosenfeld, Matthieu E-print/Working paper (2019)Consider the k-binomial equivalence: two finite words are equivalent if they share the same subwords of length at most k with the same multiplicities. With this relation, the k-binomial complexity of an ... [more ▼]Consider the k-binomial equivalence: two finite words are equivalent if they share the same subwords of length at most k with the same multiplicities. With this relation, the k-binomial complexity of an infinite word x maps the integer n to the number of pairwise non-equivalent factors of length n occurring in x. In this paper based on the notion of template introduced by Currie et al., we show that, for all k > 1, the k-binomial complexity of the Tribonacci word coincides with its usual factor complexity p(n)=2n+1. A similar result was already known for Sturmian words but the proof relies on completely different techniques that seemingly could not be applied for Tribonacci. [less ▲]Detailed reference viewed: 38 (10 ULiège) Voiture électrique : 697.612 km pour devenir verte ! Vrai ou faux ?Ernst, Damien E-print/Working paper (2019)Detailed reference viewed: 98 (7 ULiège) Electric car: 697,612 km to become green! True or false?Ernst, Damien E-print/Working paper (2019)Detailed reference viewed: 98 (3 ULiège) Invest Smarter... All my Tweets on the Art & Science of Internet-Based InvestingChoffray, Jean-Marie E-print/Working paper (2019)“Invest smarter…” I started this project three years ago. After several hundred hours of reading, thinking and writing, here they are: “All my Tweets on The Art & Science of Internet-Based Investing.” ... [more ▼]“Invest smarter…” I started this project three years ago. After several hundred hours of reading, thinking and writing, here they are: “All my 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 the years, including the most recent, and turbulent, period. As, without any doubt, I am no Warren Buffett, feel free to disagree and develop your 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: 449 (104 ULiège) Debating the Measure: Steve Reich’s Sociological Imagination.Orianne, Jean-François E-print/Working paper (2019)This article intends to identify the contributions of Steve Reich's music to sociology. His music presents three main characteristics: it is made out of empirical material collected on the field; it is a ... [more ▼]This article intends to identify the contributions of Steve Reich's music to sociology. His music presents three main characteristics: it is made out of empirical material collected on the field; it is a theory of processes; it is a political and cultural act. Steve Reich's music affects sociology on these three points: it reminds the social scientist of the nature of his craft and his commitment to the social world, questions his methods and practices; it even sheds light on some of his familiar concepts (in particular that of ‘process’). The author proposes to extract from Steve Reich’s compositional work some elements that could prove useful for sociology as a profession. [less ▲]Detailed reference viewed: 37 (1 ULiège) Landscape-like Architecture Hiroshi Senju Museum as An Alternative to PlacelessnessVan Rooyen, Xavier E-print/Working paper (2019)Detailed reference viewed: 25 (2 ULiège) Co-Housing: The Challenge of Shared Spaces within a Shared SocietyVan Rooyen, Xavier E-print/Working paper (2019)Detailed reference viewed: 19 (4 ULiège) Recourse in Kidney Exchange ProgramsBartier, Valentin; Smeulders, Bart ; Crama, Yves et alE-print/Working paper (2019)The problem to decide which patient-donor pairs in a kidney exchange program should undergo a cross-match test is modelled as a two-stage stochastic optimization problem. We give an integer programming ... [more ▼]The problem to decide which patient-donor pairs in a kidney exchange program should undergo a cross-match test is modelled as a two-stage stochastic optimization problem. We give an integer programming formulation of this so-called selection problem, and describe a solution method based on Benders decomposition. We extensively test various solution methods, and observe that the solutions, when compared to solutions found by recourse models, lead to an improvement in the expected number of transplants. We also investigate the computational efficiency of our approach as a function of different parameters, such as maximum cycle length and the presence of altruists. [less ▲]Detailed reference viewed: 32 (5 ULiège) Guide d'utilisation de Zotero: Fonctionnalités de base de l'outil de gestion bibliographiqueDony, Christophe E-print/Working paper (2019)Detailed reference viewed: 508 (253 ULiège) Photovoltaic solar panel in Wallonia: Estimating the rebound effectBoccard, Nicolas; Gautier, Axel E-print/Working paper (2019)In Wallonia (Belgium), the public support for residential solar photovoltaic panels has two interesting features. First, the subsidies for solar production, in the form of tradable green certificates ... [more ▼]In Wallonia (Belgium), the public support for residential solar photovoltaic panels has two interesting features. First, the subsidies for solar production, in the form of tradable green certificates, were particularly generous which encouraged households to have large installations. Second, the region used a net metering system to record power exchanges with the grid. With net metering, the meter runs backwards when power is supplied to the grid. But, if production exceeds consumption on a yearly basis, the production surpluses are freely available for consumption. In this context, we test for a possible rebound effect. Based on a large sample of residential PV installation in Wallonia, we observe in our data and estimations, that a large proportion of households oversize their installation to benefit from the subsidies and, later consume most of their excess production. The effect is highly significant and production surpluses are almost entirely consumed. There are thus evidence of a strong increase in energy consumption by residential PV owners. [less ▲]Detailed reference viewed: 71 (8 ULiège) A Deep Reinforcement Learning Framework for Continuous Intraday Market BiddingBoukas, Ioannis ; Ernst, Damien ; Théate, Thibaut et alE-print/Working paper (2019)Detailed reference viewed: 147 (27 ULiège) Simulation-based Assessment of the Impact of Regulatory Frameworks on the Interactions between Electricity Users and Distribution System OperatorManuel de Villena Millan, Miguel ; Ernst, Damien ; Gautier, Axel et alE-print/Working paper (2019)Detailed reference viewed: 127 (34 ULiège) Recovery management for a dial-a-ride system with real-time disruptionsPaquay, Célia ; Crama, Yves ; Pironet, Thierry E-print/Working paper (2019)The problem considered in this work stems from a non-profit organization in charge of door-to-door passenger transportation for medical appointments. Patients are picked up at home by a driver and are ... [more ▼]The problem considered in this work stems from a non-profit organization in charge of door-to-door passenger transportation for medical appointments. Patients are picked up at home by a driver and are then dropped at their appointment location. They may also be driven back home at the end of their appointment. Some patients have specific requirements, e.g., they may require an accompanying person or a wheelchair. Planning such activities gives rise to a so-called dial-a-ride problem. In the present work, it is assumed that the requests assigned to the drivers have been selected, and the transportation plan has been established for the next day. However, in practice, appointment durations may vary due to unforeseen circumstances, and some transportation requests may be modified, delayed or canceled during the day. The aim of this work is to propose a reactive algorithm which can adapt the initial plan in order to manage the disruptions and to take care of as many patients as possible in real-time. The plan should be modified quickly when a perturbation is observed, without resorting to major changes which may confuse the drivers and the patients. Several recourse procedures are defined for this purpose. They allow the dispatcher to temporarily delete a request, to insert a previously deleted request, or to permanently cancel a request. Simulation techniques are used to test the approach on randomly generated scenarios. Several key performance indicators are introduced in order to measure the impact of the disruptions and the quality of the solutions. [less ▲]Detailed reference viewed: 16 (0 ULiège) Operational risk, uncertainty, and the economy: a smooth transition extreme value approachHambuckers, Julien ; Kneib, ThomasE-print/Working paper (2019)We study the link between the distribution of extreme operational losses and the economic context, a fundamental task to compute adequate risk measures over time. In particular, we allow for time-varying ... [more ▼]We study the link between the distribution of extreme operational losses and the economic context, a fundamental task to compute adequate risk measures over time. In particular, we allow for time-varying dependencies due to structural changes, thanks to a newly-introduced smooth transition Generalized Pareto (GP) regression model. In this model, the parameters of the GP distribution are related to explanatory variables through regression functions, which depend themselves on a predictor of structural changes. Relying on this model, we study the dependence of the monthly loss severity distribution at UniCredit, over the period 2005-2014. As indicator of structural changes, we use the VIX, accounting for the general uncertainty on financial markets. We show that both the goodness-of- fit far in the tail and Value-at-Risk estimates of the total loss distribution obtained from such models are superior to a set of alternatives. We also show that in periods of high uncertainty, conditions favorable to a lax monetary policy are synonym of an increased likelihood of extreme losses. Finally, we discover evidence of a self-inhibition mechanism, where a high number of losses in a recent past are indicative of less extreme losses in the future, probably due to improved monitoring. [less ▲]Detailed reference viewed: 21 (2 ULiège) “Mapping and Testing Social Enterprise Models Across the World: Evidence from the “International Comparative Social Enterprise Models (ICSEM) Project”,Defourny, Jacques ; Nyssens, Marthe; Brolis, Olivier E-print/Working paper (2018)The relevance of an international typology of SE models, as proposed by Defourny and Nyssens (2017) is tested through an Hierarchical Cluster Analysis of a database covering 740 social enterprises in 43 ... [more ▼]The relevance of an international typology of SE models, as proposed by Defourny and Nyssens (2017) is tested through an Hierarchical Cluster Analysis of a database covering 740 social enterprises in 43 countries from all world regions. Three of the four proposed SE models find a strong empirical support: the "Entrepreneurial Nonprofit", the "Social Cooperative" and the "Social Business" models [less ▲]Detailed reference viewed: 87 (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: 117 (21 ULiège) Projet JOS. Compte-rendu de l'enquête menée dans les jardins partagés luxembourgeoisGérard, Marie E-print/Working paper (2018)Les commentateurs concernés par la question des jardins s’accordent aujourd’hui sur un point : après une éclipse qui trouve son point de départ dans les bouleversements que provoque la révolution ... [more ▼]Les commentateurs concernés par la question des jardins s’accordent aujourd’hui sur un point : après une éclipse qui trouve son point de départ dans les bouleversements que provoque la révolution industrielle, et qui s’aggravent avec l’entreprise de « modernisation » de l’après-guerre (la période dite des « Trente Glorieuses »), un « retour au jardin » s’est amorcé au début des années 1980. Depuis lors, pas un jour sans que la restauration d’un « jardin historique » ne soit programmée, sans qu’un nouveau manuel de jardinage ne soit publié, sans qu’une « fête des plantes » ne soit organisée. On s’en doute : les « jardins partagés », ces jardins « communautaires » qui ont vu le jour dans les villes du vieux continent à la fin des années 1990, participent de ce renouveau. Mais que se joue-t-il à travers ce retour au jardin ? Et en quoi cela concerne-t-il les jardins partagés ? Ce travail, qui rend compte d’une enquête menée au mois de juin 2018 dans les jardins partagés luxembourgeois engagés dans le projet JOS, se confrontera à ces deux questions. [less ▲]Detailed reference viewed: 20 (3 ULiège) Notes on security of electricity supply, some practical problems in MV/LV networks and legal aspects of building global gridGlavic, Mevludin E-print/Working paper (2018)This documents presents a note on security of electricity supply and several short notes on some technical problems in MV/LV networks and legal aspects related to building global grid. The only aim of the ... [more ▼]This documents presents a note on security of electricity supply and several short notes on some technical problems in MV/LV networks and legal aspects related to building global grid. The only aim of the document is to provide potentially useful material for those interested in the problems (particularly those at initial stage of their research). Considered problems include: 1. Security of electricity supply, 2. Approaches for optimal placement of DGs and EV’s charging stations, 3. Approaches for corrective measures (load flexibility and generation curtailment) in LV networks, 4. Approaches to infer LV network model from smart meter data, 5. Approaches for phases balancing in LV networks, 6. Approaches for voltage and thermal overload control in active distribution networks, and 7. Legal aspects related to building Global Grid. [less ▲]Detailed reference viewed: 20 (1 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: 29 (4 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: 18 (0 ULiège) The Reception of Adorno's Critical Theory in France. From the Hegelian Conception of Totality to the Critique of Heidegger's OntologyFranck, Thomas E-print/Working paper (2018)Detailed reference viewed: 48 (3 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: 119 (5 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: 34 (2 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: 13 (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: 75 (17 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: 37 (8 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: 64 (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: 88 (10 ULiège) ‘Crossovers’ in the Flemish education system: An exploratory studyProesmans, Maxim E-print/Working paper (2018)Detailed reference viewed: 57 (13 ULiège) « Proudhon, le premier pragmatiste? Petite histoire de l’autre sociologie »Frère, Bruno E-print/Working paper (2018)Detailed reference viewed: 56 (6 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: 39 (2 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: 116 (6 ULiège) Diagram, the machine abstraite of contemporary architectureVan Rooyen, Xavier E-print/Working paper (2018)Detailed reference viewed: 35 (6 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: 82 (7 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: 80 (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: 28 (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: 13 (5 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: 177 (24 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: 131 (11 ULiège) Generation of Parallel Corpus for Low Resource Language TranslationTrieu, Long Hai; Ittoo, Ashwin 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: 69 (7 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: 67 (4 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: 118 (10 ULiège) Smallest Salable Patent Practicing Unit and Component Licensing: Why $1is not$1Gautier, Axel ; Petit, Nicolas E-print/Working paper (2018)The Smallest Salable Patent Pricing Unit (SSPPU) is a valuation method used as a preliminary step towards the calculation of fair, reasonable and non-discriminatory (FRAND) royalties for licenses over ... [more ▼]The Smallest Salable Patent Pricing Unit (SSPPU) is a valuation method used as a preliminary step towards the calculation of fair, reasonable and non-discriminatory (FRAND) royalties for licenses over Standard-Essential Patents (SEPs). Under SSPPU, royalties should reflect the value added to the smallest salable component implementing the patented invention. In this paper, we discuss policy making proposals to convert SSPPU into a pricing rule that not only assists the assessment of SEPs added-value, but also forces the specification of royalties terms as a share of component costs in SEP licensing negotiations. We call this new rule SSPPU+ and we show that it distorts the distribution of surplus between SEP owners and implementers by laying down a hidden revenue-cap on standardized technologies. Furthermore, SSPPU+ imposes uniform pricing of SEPs across different industries and does not allow SEP owners to take benefit of complementarities between technologies. This pleads against a generalization of SSPPU+ at early standardization and negotiation stages. [less ▲]Detailed reference viewed: 39 (5 ULiège) Nets versus trees for feature ranking and gene network inferenceVecoven, Nicolas ; Begon, Jean-Michel ; Huynh-Thu, Vân Anh et alE-print/Working paper (2017)We propose to tackle the challenging problem of gene regulatory network inference, using variable importance measures derived from artifi cial neural networks (ANN). When combined with a L1-regularized ... [more ▼]We propose to tackle the challenging problem of gene regulatory network inference, using variable importance measures derived from artifi cial neural networks (ANN). When combined with a L1-regularized selection layer, these measures allow ANN to be competitive with state of the art techniques for this problem based on random forests. [less ▲]Detailed reference viewed: 57 (25 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: 66 (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: 127 (3 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: 76 (10 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: 65 (19 ULiège) Adorno in France. The first critical Reception of the Critical Theory in the 50'sFranck, Thomas E-print/Working paper (2017)Detailed reference viewed: 88 (6 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: 174 (28 ULiège) Simulation-based Assessment of the Impact of Regulatory Frameworks on the Interactions between Electricity Users and Distribution System OperatorManuel de Villena Millan, Miguel ; Gautier, Axel ; Fonteneau, Raphaël et alE-print/Working paper (2017)Detailed reference viewed: 139 (34 ULiège) Méditations expérimenées sur la TSUM (Transition Secondaire-Université en Mathématiques)Bair, Jacques E-print/Working paper (2017)L’objectif de ce travail est de mettre par écrit quelques idées personnelles à propos de l’enseignement des mathématiques dans une première année de l’enseignement supérieur et ainsi de réfléchir à propos ... [more ▼]L’objectif de ce travail est de mettre par écrit quelques idées personnelles à propos de l’enseignement des mathématiques dans une première année de l’enseignement supérieur et ainsi de réfléchir à propos de la transition entre le secondaire et l’Université (TSU, en abrégé) pour un cours de mathématiques. A cet effet, on compare les enseignements secondaire et universitaire, on précise une certaine conception des mathématiques et de leur enseignement au niveau de la TSU. Dans une première annexe se trouve également une étude plus théorique et technique sur la métacognition. Une particularité de ce travail est probablement de relier des idées issues de la littérature spécialisée relative à trois thèmes qui sont souvent développés indépendamment les uns des autres, à savoir l’épistémologie des mathématiques, la pédagogie universitaire et la didactique des mathématiques, le tout étant agencé d’après des convictions personnelles et des expériences professionnelles. [less ▲]Detailed reference viewed: 51 (1 ULiège) Balanced sequences of complexity 2n+1Cassaigne, Julien; Labbé, Sébastien; Leroy, Julien E-print/Working paper (2017)Detailed reference viewed: 37 (2 ULiège) Le coaching en questionsAbsil, Gaëtan E-print/Working paper (2017)Cette note apporte des éléments de réponses aux questions adressées à l’APES-ULiège par Infor Santé – Alliance nationale des Mutualités chrétiennes à propos de la notion de « coaching ». Pour répondre aux ... [more ▼]Cette note apporte des éléments de réponses aux questions adressées à l’APES-ULiège par Infor Santé – Alliance nationale des Mutualités chrétiennes à propos de la notion de « coaching ». Pour répondre aux questions, nous nous appuyons sur :  Les travaux et les réflexions menées dans le cadre des collaborations avec les acteurs de prévention et promotion de la santé  L’expertise de l’APES-ULiège en matière d’accompagnement  Une première revue de la littérature concernant le concept de coaching  Une exploitation des outils linguistiques du Centre National de Ressources Textuelles et Lexicales [less ▲]Detailed reference viewed: 153 (12 ULiège) Bien raisonner en TSUM (Transition Secondaire-Université en Mathématiques)Bair, Jacques E-print/Working paper (2017)Bien raisonner est assurément une des compétences clés que doivent acquérir et développer les étudiants entrant à l’Université. Nous y consacrons entièrement ce travail illustré par de nombreux exemples ... [more ▼]Bien raisonner est assurément une des compétences clés que doivent acquérir et développer les étudiants entrant à l’Université. Nous y consacrons entièrement ce travail illustré par de nombreux exemples construits à partir de notre expérience professionnelle. En premier lieu, nous distinguons, à la suite de G. Polya, les raisonnements plausibles des raisonnements démonstratifs. Ensuite, nous nous intéressons à certains éléments de logique qui nous paraissent importants au niveau d’une TSUM. Puis, nous analysons la nature de preuves mathématiques à ce stade de l’apprentissage. Enfin, nous dissertons quelque peu sur l’usage des démonstrations dans l’enseignement. Ce travail se termine par deux annexes techniques, relatives respectivement à différents types de syllogismes et à quelques éléments plus formels de logique mathématique. [less ▲]Detailed reference viewed: 46 (1 ULiège) Les mathématiques: une science comme les autres ?Bair, Jacques E-print/Working paper (2017)Les mathématiques sont-elles une science et, dans l'affirmative, sont-elles comparables aux autres disciplines scientifiques comme la physique, la biologie, ... ? Nous apportons des éléments de réponse à ... [more ▼]Les mathématiques sont-elles une science et, dans l'affirmative, sont-elles comparables aux autres disciplines scientifiques comme la physique, la biologie, ... ? Nous apportons des éléments de réponse à de telles questions en basant principalement nos arguments sur la distinction, due au mathématicien-épistémologue G. Polya, entre les raisonnements plausibles ou démonstratifs. [less ▲]Detailed reference viewed: 17 (0 ULiège) Liens entre mathématiques et jeuxBair, Jacques E-print/Working paper (2017)Le présent travail se compose de plusieurs parties. En premier lieu, nous définissons le concept général de jeu et présentons quelques mathématiciens célèbres, de toutes époques, qui étaient (ou sont ... [more ▼]Le présent travail se compose de plusieurs parties. En premier lieu, nous définissons le concept général de jeu et présentons quelques mathématiciens célèbres, de toutes époques, qui étaient (ou sont encore) des adeptes de jeux mathématiques. Ensuite, nous établissons une typologie des jeux mathématiques. Une deuxième partie est consacrée à l’intervention des jeux dans l’enseignement des mathématiques. Nous donnons divers avantages des activités ludiques en classe, mais également des objections relatives à leur usage à des fins pédagogiques. Nous nous demandons aussi comment sélectionner un jeu pour des élèves et exhibons des exemples concrets de jeux exploitables en classe. Ce travail se termine par une bibliographie sur le sujet, ainsi que par une annexe composée de diapositives présentées lors d’un exposé réalisé à l’Université du Luxembourg dans le cadre de la Formation Pédagogique (FOPED) : nous y décrivons brièvement différentes épreuves ludiques proposées ces dernières années à des élèves de l’enseignement secondaire en France, Belgique et au Luxembourg. [less ▲]Detailed reference viewed: 147 (0 ULiège) Sur l'évaluation de compétences en mathématiquesBair, Jacques E-print/Working paper (2017)Ce document comprend deux parties. Tout d’abord, un texte est consacré à des généralités sur la mesure de compétences, ainsi qu’à la présentation, illustrée par des exemples concrets, de différents types ... [more ▼]Ce document comprend deux parties. Tout d’abord, un texte est consacré à des généralités sur la mesure de compétences, ainsi qu’à la présentation, illustrée par des exemples concrets, de différents types d’échelles (universelle, descriptive, globale) et de grilles d’évaluation. Enfin, ce travail se termine par la reproduction de diapositives (initialement réalisées à l’aide du logiciel Power Point) préparées pour accompagner une leçon sur l’évaluation ; l’exposé oral correspondant a été donné, dans le cadre de la FOPED (Formation Pédagogique), à plusieurs cohortes de stagiaires en mathématiques à l’Université du Luxembourg. [less ▲]Detailed reference viewed: 123 (3 ULiège) Petite apologie de l'analogie en mathématiquesBair, Jacques E-print/Working paper (2017)L'analogie est souvent utilisée par les mathématiciens car elle s'avère déterminante très souvent dans la création de mathématiques nouvelles. Pour illustrer simplement ces propos, nous présentons deux ... [more ▼]L'analogie est souvent utilisée par les mathématiciens car elle s'avère déterminante très souvent dans la création de mathématiques nouvelles. Pour illustrer simplement ces propos, nous présentons deux exemples, l'un de géométrie et l'autre d'analyse, qui ont été initialement développés par G. Polya. Une brève biographie de cet auteur est présentée en fin d'article. [less ▲]Detailed reference viewed: 20 (1 ULiège) Quelques idées générales à propos de la compréhension en mathématiquesBair, Jacques E-print/Working paper (2017)Dans cet article, nous apportons des éléments de réponse à la question générale suivante : "Que signifie bien comprendre en mathématiques ?" Nous nous demandons pourquoi il est difficile d'y répondre et ... [more ▼]Dans cet article, nous apportons des éléments de réponse à la question générale suivante : "Que signifie bien comprendre en mathématiques ?" Nous nous demandons pourquoi il est difficile d'y répondre et apportons une piste de solution en distinguant les activités de production de celles de reproduction. De plus, nous abordons le problème étudié d'un point de vue aussi bien local que global. Enfin, nous nous interrogeons sur l'incompréhension en mathématiques en proposant une typologie, en repérant des causes possibles d'incompréhension et en donnant quelques conseils pratiques. [less ▲]Detailed reference viewed: 58 (5 ULiège) Investment in Flexible Resources with Demand Correlation: an application to cloud computingLam, Wing Man Wynne E-print/Working paper (2017)Detailed reference viewed: 63 (10 ULiège) Impact des valeurs responsables des médecins sur l’efficacité des services médicaux dans les CHU algériens : modélisation par les plans d’expériencesBounazef, Djida ; Van Caillie, Didier E-print/Working paper (2017)Medical doctors impact the efficiency of medical departments through their level of skill and engagement. The sensitivity of medical doctors on responsible and inclusive values fosters a stable work ... [more ▼]Medical doctors impact the efficiency of medical departments through their level of skill and engagement. The sensitivity of medical doctors on responsible and inclusive values fosters a stable work climate that optimizes organizational efficiency and performance in UHCs’ departments. This reduces sources of nuisance and demotivation for optimal work stability, which induces efficiency’s improvement. The case study is done on 30 different services belonging to the Algerian UHCs in the purpose to build a model by the method of design of experiments. Multiple regression studies correlations between sensitivity to responsible values, work climate, workplace stability and efficiency of studied departments. It also allows to predict the improvement of departments’ efficiency according to the variation of dependent variables for optimizing the UHCs’ performance. The study’s results illustrate the strong correlation of sensitivity to responsible values and workplace stability’s variables on efficiency. They also highlight strong relations of interdependence between firstly responsible values and work climate, and secondly, between climate and workplace stability. [less ▲]Detailed reference viewed: 32 (0 ULiège) La Ceinture Aliment-Terre Liégeoise : des initiatives locales au projet de transition territorialeFeyereisen, Marlène ; Stassart, Pierre M E-print/Working paper (2017)Depuis une dizaine d’années, des initiatives qui cherchent à territorialiser la production et la consommation de produits alimentaires se développent dans le paysage agroalimentaire wallon. Parmi celles ... [more ▼]Depuis une dizaine d’années, des initiatives qui cherchent à territorialiser la production et la consommation de produits alimentaires se développent dans le paysage agroalimentaire wallon. Parmi celles-ci, la Ceinture aliment-terre liégeoise (CATL) est une dynamique qui s’est construite autour d’un diagnostic du système agroalimentaire conventionnel et propose des alternatives en région liégeoise. La CATL a pour caractéristique principale de constituer un « mouvement citoyen », c’est-à-dire qu’elle mobilise les citoyens dans la transformation du système agroalimentaire. Pour analyser cette initiative, nous allons retracer la trajectoire de la CATL depuis sa naissance jusqu’à aujourd’hui, ainsi que les dilemmes et questionnements auxquels elle a dû faire face tout au long de son évolution et comment elle propose d’y répondre. Cette analyse permet de comprendre que le potentiel de transformation de la CATL pour la transition réside surtout dans sa capacité à intégrer une série d’initiatives du territoire dans une vision commune pour construire une « niche globale territoriale » plus à même d’influencer le régime et d’engager une transition du système agroalimentaire liégeois et wallon. [less ▲]Detailed reference viewed: 122 (25 ULiège) La dynamique de la controverse du piétonnier de BruxellesCharlery de la Masselière, Madeleine ; Esnoul, Elise ; Pfohl, Clémentine et alE-print/Working paper (2017)La dynamique de la controverse apparue autour du projet de piétonisation des boulevards centraux de la Ville de Bruxelles est relue à travers la théorie de l’acteur réseau (Callon &Latour 1986) . Ceci ... [more ▼]La dynamique de la controverse apparue autour du projet de piétonisation des boulevards centraux de la Ville de Bruxelles est relue à travers la théorie de l’acteur réseau (Callon &Latour 1986) . Ceci permet de mettre en évidence deux traductions concurrentes : celle de la ville et celle de la Platform Pentagone. La ville a traduit son projet en organisant un réseau d’acteurs autour du point de passage obligé (PPO) suivant : « piétonniser les boulevards centraux pour stopper le transit automobile et faire du centre de Bruxelles un nouveau cœur urbain attractif ». La traduction de la Platform Pentagone, notre deuxième porte-parole, propose un autre point de passage obligé : « faire un piétonnier négocié, favorable à tous les usagers ». Cette formulation entre en concurrence directe avec celle de la ville. Chacune des deux problématisations illustre une conception différenciée de la notion de piétonnier ainsi que de ce qui est, ou non, négociable. Des dissidences apparaissent qui permettent de relever une série d’ambigüités au sein des réseaux et des diverses situations. [less ▲]Detailed reference viewed: 141 (4 ULiège) The impact of external market conditions on R&D valuationLambert, Marie ; Moreno, Manuel; Platania, FedericoE-print/Working paper (2017)Traditional real options models regard the idiosyncratic risk of a project as the main value driver. Beyond the specific risks embedded in the project, i.e., both its technical and idiosyncratic risk, our ... [more ▼]Traditional real options models regard the idiosyncratic risk of a project as the main value driver. Beyond the specific risks embedded in the project, i.e., both its technical and idiosyncratic risk, our model captures the interactions among different market, economic and social forces and their impact on R&D project valuation. Using Fourier series, our model aggregates external forces that play relevant roles in the process that determines the cash flow structure. Consequently, the posited model provides managers and policy makers with a powerful yet flexible tool to stress test several economic scenarios under which the project could develop. In a practical case, we apply our novel model and methodology to the valuation of a pharmaceutical R&D project and examine the impact of external forces on the optimal time to launch the project. The real options approach also allows for the possibility of optimally abandoning a project before completion whenever the investment cost exceeds the expected net cash flow stream after considering the impact of market conditions. [less ▲]Detailed reference viewed: 43 (1 ULiège) Targeted advertising and consumer informationBroos, Sébastien E-print/Working paper (2017)Detailed reference viewed: 29 (2 ULiège) Leadership and organisational values in university hospital centres: An analysis based on EFQM model.Bounazef, Djida ; Van Caillie, Didier E-print/Working paper (2017)Detailed reference viewed: 52 (5 ULiège) Decidable properties of extension graphs for substitutive languagesDolce, Francesco; Kyriakoglou, Revekka; Leroy, Julien E-print/Working paper (2017)Detailed reference viewed: 34 (2 ULiège) Réécrire (avec) Kafka. Une paradoxale figure de l’exit, entre silence, mensonge et véritéLucca, Sian E-print/Working paper (2017)Detailed reference viewed: 31 (2 ULiège) Adaptive large neighborhood search for multi-trip vehicle routing with time windowsFrançois, Véronique ; Arda, Yasemin ; Crama, Yves E-print/Working paper (2017)We consider a multi-trip vehicle routing problem with time windows (MTVRPTW), in which each vehicle can perform several trips during its working shift. This problem is especially relevant in the context ... [more ▼]We consider a multi-trip vehicle routing problem with time windows (MTVRPTW), in which each vehicle can perform several trips during its working shift. This problem is especially relevant in the context of city logistics. Heuristic solution methods for multi-trip vehicle routing problems often separate routing and assignment phases in order to create trips and then assign them to the available vehicles. We show that this approach is outperformed by an integrated solution method in the presence of time windows. We use an automatic configuration tool to obtain efficient and contextualized implementations of our solution methods. We provide suitable instances for the MTVRPTW as well as an instance generator. Also, we discuss the relevance of two objective functions: the total duration and the total travel time. When minimizing the travel time, large increases of waiting time are incurred, which is not realistic in practice. [less ▲]Detailed reference viewed: 63 (24 ULiège) Lineability in multifractal analysisEsser, Céline ; Jaffard, Stéphane E-print/Working paper (2017)The multifractal behavior of generic functions belonging to H older, Sobolev or Besov spaces has been investigated by many authors, using the concepts of Baire residuality and of prevalence. This paper ... [more ▼]The multifractal behavior of generic functions belonging to H older, Sobolev or Besov spaces has been investigated by many authors, using the concepts of Baire residuality and of prevalence. This paper aims at obtaining the corresponding results in the framework supplied by the notion of lineability. Furthermore, we also study the question of algebrability, proving negative and positive results. [less ▲]Detailed reference viewed: 22 (0 ULiège) La satisfaction des conditions de travail des médecins comme facteur déterminant des réussites médicalesBounazef, Djida ; Van Caillie, Didier E-print/Working paper (2017)Quality of workplace health and safety conditions of medical doctors has a strategic role in their availability for patients’ care, risk reduction of medical errors and rate of medical successes. The ... [more ▼]Quality of workplace health and safety conditions of medical doctors has a strategic role in their availability for patients’ care, risk reduction of medical errors and rate of medical successes. The improvement of these conditions represents an opportunity of internal improvement that optimizes better medical services. The case study examines the quality of workplace health and safety conditions of 200 medical doctors belonging to different Algerian UHCs. It analyses its correlation with the daily time devoted to the care of patients, with the rate of risk reduction of medical errors, and with the rate of medical successes. Multiple regression analyses the interaction effect of the three first variables on the rate of medical successes. Results determine a strong causal factor between medical doctors’ availability – quality of workplace conditions and medical successes. Results also highlight a strong correlation between quality of workplace conditions and risk reduction of medical errors. [less ▲]Detailed reference viewed: 39 (5 ULiège) Potential, opportunities and benefits of electric vehicles as frequency regulation resourcesGlavic, Mevludin ; Alvarado, FernandoE-print/Working paper (2016)Any imbalance between electric power supply and demand results in power system frequency deviations from its nominal value. Frequency regulation is one of the most important services that regional system ... [more ▼]Any imbalance between electric power supply and demand results in power system frequency deviations from its nominal value. Frequency regulation is one of the most important services that regional system operators perform to ensure reliable system operation. Traditional power supply sources such as generators are usually automatically modulated to help balance generation and demand by adjusting their output based in part on system frequency. As a result of the decreased inertia of the system caused by decommissioning of traditional power plants and the increase in the penetration of renewable energy sources, the increased use of demand side controls for the purpose of frequency regulation is receiving increased attention. Demand control can provide fast response to any imbalance. This opens up the possibility for Electric Vehicles (EVs) to be used as frequency regulation grid resources. This write-up discusses the potential, opportunities and benefit of doing so. [less ▲]Detailed reference viewed: 85 (3 ULiège) Status and Coordination in OrganizationsLam, Wing Man Wynne E-print/Working paper (2016)Detailed reference viewed: 77 (9 ULiège) Le compromis entre culture non punitive et culture juste : analyse des sous-cultures de sécurité des patients dans un service de radiothérapieKamto Kenmogne, Marius ; Van Caillie, Didier ; BOGA, Deniz et alE-print/Working paper (2016)The recent publication of the report "Medical error-the third leading causes of death in the US" (Makary & Daniel, 2016) has led to a renewed attention to the issue of patient safety in many developed ... [more ▼]The recent publication of the report "Medical error-the third leading causes of death in the US" (Makary & Daniel, 2016) has led to a renewed attention to the issue of patient safety in many developed countries. The main issue involved is the role played by medical staff work in the occurrence of deaths from the medical care. According to Makary & Daniel, communication failures, misdiagnosis, bad judgments and inadequate skills have caused an average of 251,454 deaths per year in the United States in 2013. This report has taken the opposite view of the proponents of "No shame no blame" approach characterizing a non-punitive culture in which people are led to blame the system even though human responsibility is obvious. While the no-blame culture has often been presented as the success factor of an efficient safety /quality policy in medical settings (Amalberti et al., 2005; Woynar et al, 2007), discordant voices now stand to underline the limits of this approach (see eg Dekker & Breakey, 2016; Levitt, 2014 or Shojania & Dixon-Woods, 2013). These authors argue that the no-blame culture is difficult to implement in practice and suggest the implementation of a just culture that places more emphasis on individuals' behavior and performance and on their responsibility at work. In this context, this study examines – based on an in-depth longitudinal case study of a radiotherapy department that has implemented a reporting system for adverse events - the extent to which non-punitive culture and just culture can live together in the same organizational unit. By combining in-depth interviews with members of the quality team and a questionnaire survey administered to all staff, we evaluate the current safety subcultures in the service. The content analysis of the interviews and the treatment of questionnaires following the methodology of the Agency for Healthcare Research and Quality allows to see the emergence of three subcultures in the radiotherapy department studied: a reporting subculture, a non-punitive subculture and, to some extent, a just subculture. The study shows that the development of the safety culture in this department is based primarily on the establishment of a non-punitive subculture used as a way to encourage spontaneous reporting of adverse events. The reporting culture is therefore the more controlled dimension of the safety culture of the department. Concerning responsibility of workers, the study shows that they have no fear of punishment and are not even familiar with the term in the workplace. On the contrary, instead of a retributive just culture, the department has focused its safety culture on learning from mistakes and substantial just culture based on a system of worker participation in the preparation of procedures that prescribe the right way to work. [less ▲]Detailed reference viewed: 109 (10 ULiège) LARCH: A package for estimating multinomial, nested, and cross-nested logit models that account for semi-aggregate dataNewman, Jeffrey; Lurkin, Virginie ; Garrow, LaurieE-print/Working paper (2016)We present a summary of important computational issues and opportunities that arise from the use of semi-aggregate data (where the explanatory data for choice scenarios are not necessarily unique for each ... [more ▼]We present a summary of important computational issues and opportunities that arise from the use of semi-aggregate data (where the explanatory data for choice scenarios are not necessarily unique for each decision-maker) in discrete choice models. This data feature is commonly encountered with large transactional databases that have limited consumer information, such as itinerary choice modeling. We developed a software package called Larch, written in Python and C++, to take advantage of this kind of data to greatly speed the estimation of discrete choice model parameters. Benchmarking experiments against Stata (a commonly used commercial package) and Biogeme (a commonly used freeware package) based on an industry dataset for airline itinerary choice modeling applications shows that the size of the input estimation files are 50 to 100 times larger in Stata and Biogeme, respectively. Estimation times are also much faster in Larch; e.g., for a small itinerary choice problem, a multinomial logit model estimated in Larch converged in less than one second whereas the same model took almost 15 seconds in Stata and more than three minutes in Biogeme. For more complex discrete choice models, such as the ordered generalized extreme value model, estimation times were two seconds in Larch and four to five days in Biogeme. [less ▲]Detailed reference viewed: 311 (6 ULiège) The np- Control Charts with the Guaranteed In-Control PerformanceFaraz, Alireza ; Heuchenne, Cédric E-print/Working paper (2016)In this paper, we evaluate the in-control performance of np-control charts with estimated parameters. We then apply the bootstrap method to adjust the control charts’ limits to guarantee the desired in ... [more ▼]In this paper, we evaluate the in-control performance of np-control charts with estimated parameters. We then apply the bootstrap method to adjust the control charts’ limits to guarantee the desired in-control average run length (ARL0) value in monitoring stage. The adjusted limits ensure that ARL0 would take a value greater than the desired value (say, B) with a certain specified probability, that is Pr⁡(ARL_0>B)=1-ρ. We finally provide users with tables which with practitioners do not need to do bootstrapping Phase I data set to obtain the control limit thresholds. [less ▲]Detailed reference viewed: 109 (1 ULiège) The Economic Forces Behind Deindustrialization: An Empirical InvestigationVan Neuss, Leif E-print/Working paper (2016)The purpose of this paper is to provide an in-depth study of deindustrialization and to systematically analyze the reasons why the world’s most economically successful countries have experienced a sharp ... [more ▼]The purpose of this paper is to provide an in-depth study of deindustrialization and to systematically analyze the reasons why the world’s most economically successful countries have experienced a sharp decline in relative manufacturing employment over the last decades. A large strand of empirical literature on deindustrialization aims at quantifying the relative importance of the economic forces behind deindustrialization, especially of the ‘internal’ and ‘external’ factors. While this study does not contradict the widespread belief that internal factors are quantitatively more important in explaining deindustrialization in advanced countries taken as a whole, our results, based on both static and dynamic techniques and panel data on 18 OECD countries from 1977 to 2007, however suggest that the role of globalization may be revised upwards when resorting to appropriate and well-defined indicators of trade in manufactures. [less ▲]Detailed reference viewed: 85 (3 ULiège) They will need land! The current land tenure situation and future land allocation needs of smallholder farmers in CambodiaDiepart, Jean-Christophe E-print/Working paper (2016)The objective of this background paper is to provide a succinct description of the land tenure situation in Cambodia and, on that basis, discuss the needs smallholder farmers have for land, projected up ... [more ▼]The objective of this background paper is to provide a succinct description of the land tenure situation in Cambodia and, on that basis, discuss the needs smallholder farmers have for land, projected up to the year 2030. The main problem it examines lies at the intersection between, on one hand, the demographic increase in the rural smallholder population and its associated need for land in the future (the demand side) and, on the other hand, the possibility offered by the different land tenure regimes to meet this demand (the supply side); the central question focuses on how supply can meet demand.By looking first at how much land is available under different categories (the supply side), the paper succinctly presents and maps the different land tenure regimes with updated statistics and discusses their main outcomes and shortcomings. On that basis, we present a preliminary assessment of land distribution by main land tenure systems in Cambodia. The land under cultivation by smallholders represents 19 percent of the total area of the national territory and is itself sub-divided into agricultural land with land titles (systematic land registration, 6 percent and land covered by the Order 01, 6 percent), under Social Land Concession arrangements (1 percent) and untitled (6 percent). The forest cover includes forest concessions (10 percent), Community Forestry (2 percent), Protected Areas and Protection Forests (20 percent) and an unclassified forest cover area (14 percent). Economic Land Concessions under operation represent 12 percent while cancelled concessions represent 2 percent of the total territory. The actual tenure of a large non-forested area (14 percent) remains undetermined and further updates are needed to shed light on this issue. The paper suggests that the central problem of the current Cambodian land reform is its ineffectiveness in coordinating the processes of land rights security and formalization in lowland and upland areas, although both regions are closely linked through land-driven migration movements that have intensified over the past 20 years. This has been particularly contentious given the fact that in a parallel process, and driven by a strong, state-based political economy, large land deals have been concentrated in the uplands of the entire country along processes that are exclusionary in nature. The overlap of competing land claims has created a widespread conflict situation in all uplands region of the country. By looking at how much land is needed for family farmers in the future (the demand side), the paper anticipates the land requirements of smallholder farmers by 2030 based on the projected demographic increase in the economically active population in rural Cambodia and on two sets of scenarios i) the transfer of unskilled labour from the agricultural to the secondary and tertiary sectors (industries and services) and ii) the provision of land for smallholder farmers. The analysis suggests that by the year 2030, the transfer of unskilled labour from agriculture to the secondary and tertiary sectors will lag behind the demographic increase in the active rural population. With 2015 as a baseline, the scenarios suggests that by 2030 smallholder farmers will need an additional land area ranging from 320,600 ha (+10 percent in relation to the actual area at the present time) to 1,962,400 (+64 percent), with an average desirable scenario of 1,622.000 ha based on an allocation of 1ha per active labourer (in accordance with the present social concession policy) and on the continuation of the present transfer rate of unskilled manpower from agriculture to the secondary and tertiary sectors (i.e. the transfer of 40.000 workers per year). So the question that needs to be formulated does not revolve around whether or not the rural population will need land in the future, but rather around how this can occur. Along these lines, the paper discusses different options, which are not mutually exclusive, to allocate this land without further impact on the forest cover: i) by redistribution of land from cancelled Economic Land Concessions, ii) through a firmer recognition of swidden agriculture inside Protected Areas, iii) through a far more ambitious Social Land Concession programme and iv) through further reform of the forest concession system. The paper concludes by stressing the need for relevant ministries to engage in open and constructive research-based discussion so that these options can materialize into concrete actions. [less ▲]Detailed reference viewed: 131 (2 ULiège) Dynamic Equivalents of Active Distribution Networks: A short ReviewGlavic, Mevludin E-print/Working paper (2016)The complexity of modern power systems, despite impressive progress in computational architectures, still necessitate simplified representation of their parts for local dynamic studies. The high ... [more ▼]The complexity of modern power systems, despite impressive progress in computational architectures, still necessitate simplified representation of their parts for local dynamic studies. The high penetration of Distributed Generation (DG) at the transmission and distribution network levels, the new load types and increased use of power electronics are among key factors contributing to the systems’ complexity. Particularly, representation of active distribution networks (ADN) in dynamic studies became an important research and practical implementation question. This report shortly reviews previous and existing approaches for dynamic equivalencing of ADNs and offers some recommendations for future research on this important issue. The report is organized as follows. First, the problem of dynamic equivalencing is shortly presented together with approaches to compute them. This is followed by a quick review of past notable works on this problem. Next, the approaches for dynamic equivalencing of ADNs, proposed so far in literature (available to the author), are reviewed. The reports ends with some recommendations for future research. [less ▲]Detailed reference viewed: 15 (1 ULiège) Nouvelles normes sylvicoles pour les peuplements purs équiennes d'épicéa et de douglasPerin, Jérôme ; Hebert, Jacques ; Lejeune, Philippe et alE-print/Working paper (2016)Ces documents rassemblent les tables de production (version 2016) représentant les nouvelles normes sylvicoles recommandées pour les peuplements purs équiennes d'épicéa commun et de douglas. Un ensemble ... [more ▼]Ces documents rassemblent les tables de production (version 2016) représentant les nouvelles normes sylvicoles recommandées pour les peuplements purs équiennes d'épicéa commun et de douglas. Un ensemble de 10 tables de production est présentée pour chaque essence, associant deux densités de plantation (2.5 x 2 m et 2 x 2 m) et 5 classes de productivité (0 à IV). [less ▲]Detailed reference viewed: 446 (100 ULiège) Early Detection of University Students in Potential DifficultyHoffait, Anne-Sophie ; Schyns, Michael E-print/Working paper (2016)Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant issue ... [more ▼]Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant issue at a time when post-secondary education is ever more critical to economic success. We aim at early detection of potential failure using student data available at registration, i.e. school records and environmental factors, with a view to timely and efficient remediation and/or study reorientation. For the sake of accuracy, we adapt three data mining methods, namely random forest, logistic regression and artificial neural network algorithms. Real data pertaining to undergraduates at the University of Liège (Belgium), illustrates our methodology. [less ▲]Detailed reference viewed: 41 (20 ULiège) Appropriability and the European Commission’s Android InvestigationAuer, Dirk E-print/Working paper (2016)This paper seeks to ascertain whether Google’s Android licensing terms, which are currently under scrutiny from the European Commission, could be excused under an innovation defense framework. The paper ... [more ▼]This paper seeks to ascertain whether Google’s Android licensing terms, which are currently under scrutiny from the European Commission, could be excused under an innovation defense framework. The paper starts by analyzing Google’s business model with regard to its Android OS. It then identifies the Commission’s main concerns. It argues that Google is simply pursuing a sensible appropriation strategy. Finally, it puts forward a framework which hinges on the concept of “appropriability”, and tentatively applies it to Google’s behavior. [less ▲]Detailed reference viewed: 109 (5 ULiège) Challenges in Managing State Land in Cambodia: Addressing Competing Interests for Lands inside Protected Areas (PAs)Ngin, Chanrith; Diepart, Jean-Christophe E-print/Working paper (2016)Detailed reference viewed: 28 (3 ULiège) Some characterizations about Generalized Hölder-Zygmund Spaces Λ_{σ,N}^{α}(R^d)Kreit, Damien ; Nicolay, Samuel E-print/Working paper (2016)Generalized Hölder-Zygmund spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ were recently introduced and are based on a generalization of Besov spaces. Under some conditions, generalized Hölder-Zygmund and ... [more ▼]Generalized Hölder-Zygmund spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ were recently introduced and are based on a generalization of Besov spaces. Under some conditions, generalized Hölder-Zygmund and Besov spaces are equal. It has been proved that most properties of classical Hölder-Zygmund spaces are held for spaces $\Lambda^{\sigma,\alpha}(\R^{d})$, which constitute a particular case of spaces $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ with $N_{j}=2^{j}$. The goal of the present document is to prove that most of these properties are kept for $\Lambda_{\sigma, N}^{\alpha}(\R^{d})$ spaces. [less ▲]Detailed reference viewed: 37 (5 ULiège) A Comparison of Departure Time of Day FormulationsLurkin, Virginie ; Garrow, Laurie; Higgins, Matthew et alE-print/Working paper (2016)Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been ... [more ▼]Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been used to model departure time of day preferences. The first is a discrete formulation that uses indicator variables to represent the hour of departure. The next two methods are based on a continuous formulation that uses a series of sine and cosine functions. One assumes departure time preferences over a 24-hour cycle and the other uses shorter cycle lengths that account for fewer departures during certain hours of the day. We compare models using itineraries in the Continental U.S. that are separated by two time zones. Although the discrete formulation fits the data better, the two continuous time of day formulations are preferred as they provide more intuitive predictions and require fewer parameters. Results between the two continuous time of day formulations are similar but differ in how strongly they weight itineraries that depart very early or very late in the day. Based on empirical results, we recommend testing both 24-hour and less than 24-hour cycle lengths for a particular dataset. [less ▲]Detailed reference viewed: 19 (8 ULiège) Structure et négativité dans la Préface de 1961 à L'Histoire de la folieOulc'hen, Hervé E-print/Working paper (2016)Detailed reference viewed: 25 (2 ULiège) Résumé de la thèse: Rôle du climat et de la compétition interspécifique dans la limitation de l'aire d'invasion d'Ambrosia artemisiifolia L. en Europe de l'OuestOrtmans, William E-print/Working paper (2016)The invasion continuum is classically described from a temporal point of view, where a species overcomes a defined number of barriers linked to the environment. First, an exotic species has to get through ... [more ▼]The invasion continuum is classically described from a temporal point of view, where a species overcomes a defined number of barriers linked to the environment. First, an exotic species has to get through the geographical barrier, in order to be introduced in the new area. When introduced, the species has to face the new environmental conditions and survive to start the naturalization phase. When the environmental barrier is overcome, i.e. when the species is able to reproduce and its populations are self-sufficient, it has to overcome the dispersal barrier to spread in the ecosystem and finally become invasive. Within a given continent, a species could have overcome a variable number of barriers depending on the considered area. One can observe depending on the geographical zone some non-naturalized populations that cannot survive without a human introduction of new propagules, some naturalized populations that are not invasive yet, and some invasive populations. This geographical variation may be the result of a variation of the environmental conditions at the continental scale. The common ragweed (Ambrosia artemisiifolia L.) invasion in Western Europe is a good opportunity to study this aspect of the invasion biology. The invasion history and the species distribution are well documented, and highlight a geographical variation of the invasion dynamic. This is particularly clear in Western Europe, where lies a contrast between the highly invaded zone of the South of France, and the areas that are farther north (e.g. the North of France, Belgium, and the Netherlands). In this work, the general objective was to determine if this situation will remain stable or not, by assessing if the local climate and the interspecific competition were liming the species expansion northward. In order to answer this general objective, four different questions were asked: 1) Is the climate and/or the interspecific competition causing a plant performance variation within the different areas of the introduced range in Western Europe?; 2) Is the local climate allowing the establishment and the reproduction of newly introduced populations north to the current invaded range, in an agricultural habitat?; 3) What is the role of the morphological variability of the seeds in the invasion of areas experiencing rigorous climatic conditions?; and 4) What is the role of the priority effect in the species establishment? The results showed that once introduced in an agricultural habitat outside the current invaded range, the species was able to establish self-sustaining populations. On average, each plant produced a number of offspring equal to 273 ± 18.4 (mean ± standard error). In ruderal habitats, populations already exist in Belgium and in the South of The Netherlands, and are able to produce a high quantity of seeds: on average, measured plants carried 222± 32.0 seeds. The measured plant performances were similar to those measured within the invaded area. No limit to the colonization of the area beyond the current invaded range was found in this study. The local climate and the interspecific competition did not appear to limit the naturalization of the species in the studied area, which is located north to the current invaded range, in agricultural or ruderal situations. This work highlighted the obsolescence of the species status in Belgium, and illustrated the dynamic aspect of the invasion. The results showed the importance of the temporality in the colonization of disturbed habitats. When the species started its development a few weeks before the rest of the community, its performance was decupled, and this increase was higher than the one other Asteraceae ruderals species showed in the same position: its above ground biomass was 30.5 ± 1.94 times higher, and the number of flower heads 570 ± 160 times more important.. The high variability of the species observed all along this work is probably playing an important role in the invasion success. The high variability of the seeds morphology can widen the range of environmental conditions of the habitats the species is able to colonize. In addition, the plasticity of the morphological traits of the plant in response to climate and competition appeared to allow the species to maintain a good performance, even in stressful conditions. The results of this work suggest an invasion potential north to the current invaded area in Western Europe. In this uncertain situation, it appears critical to implement structure allowing the early detection of the species. This early detection may allow the eradication of the species before that the invasion was as problematic as in France. Sensitization campaigns of the agricultural sector should be encouraged in Belgium in order to avoid new occurrence of the species in field to be overlooked. These measures could allow the dispersion to remain a limiting factor for the invasion process in Belgium. [less ▲]Detailed reference viewed: 216 (89 ULiège) 1 2 3 4