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See detailDroits de l'homme. Support Power point 2017-2018
Bouhon, Frédéric ULg

Learning material (2017)

Il s'agit de la version provisoire du support Powerpoint qui est utilisé dans le cadre du cours de Droits de l'homme pour l'année 2017-2018. Des amendements pourront être apportés par le professeur à l ... [more ▼]

Il s'agit de la version provisoire du support Powerpoint qui est utilisé dans le cadre du cours de Droits de l'homme pour l'année 2017-2018. Des amendements pourront être apportés par le professeur à l'occasion de la préparation des séances de cours, notamment pour tenir compte de l'actualité. Une version définitive sera fournie ultérieurement aux étudiants. [less ▲]

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See detailQuelle politique énergétique en Belgique pour les 30 prochaines années ?
Lilien, Jean-Louis ULg

Book published by Université de Liège (2017)

L’évolution vers les énergies renouvelables (éoliennes et panneaux photovoltaïques) paraît incontournable. La cogénération (électricité et chaleur) aussi. Sans doute faut-il faire encore des progrès dans ... [more ▼]

L’évolution vers les énergies renouvelables (éoliennes et panneaux photovoltaïques) paraît incontournable. La cogénération (électricité et chaleur) aussi. Sans doute faut-il faire encore des progrès dans le stockage de l’énergie et, peut-être, dans l’utilisation de l’hydrogène. Hélas la variabilité du climat ne génère pas une production constante d’énergie. Notre proposons dès lors une solution basée sur une solidarité européenne (au sens large) et une souplesse d’utilisation du réseau d’énergie électrique. Tout en prônant un changement radical de paradigme : notre consommation doit s’adapter à la production et non l’inverse. [less ▲]

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See detailPhoto-Ionization GCxGC-HRTOF/MS for Aviation Fuel Characterization
Giri, Anupam ULg; Courtiade; Racaud et al

Conference (2017, September)

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See detailL'autonomie de la volonté dans les relations familiales internationales
Wautelet, Patrick ULg; Fulchiron, Hugues; Panet, Amélie

Book published by Bruylant (2017)

Les règlements de l’Union européenne adoptés dans le domaine du droit international privé laissent une place de plus en plus importante à la volonté des parties dans le règlement des litiges ... [more ▼]

Les règlements de l’Union européenne adoptés dans le domaine du droit international privé laissent une place de plus en plus importante à la volonté des parties dans le règlement des litiges transfrontières. Phénomène généralisé du droit international privé contemporain, l’autonomie de la volonté s’accroît dans un domaine qui lui était traditionnellement étranger : le domaine du droit de la famille, entendu au sens large (droit patrimonial et extra patrimonial). L’essor de l’autonomie de la volonté en droit de l’Union européenne soulève de nombreuses questions : quel doit être aujourd’hui le domaine de l’autonomie de la volonté ? Comment confronter l’autonomie de la volonté avec les lois de police ? Quelle place faut-il accorder aux ordres publics nationaux ? Quel rôle doivent jouer les droits fondamentaux (moteur ou limite) ? Au-delà de ces questions théoriques, l’ouvrage tente également de répondre aux interrogations pratiques : comment les avocats et les notaires peuvent-ils aider leurs clients à mettre en œuvre l’autonomie de la volonté que leur concède l’Union européenne ? Qu’implique aujourd’hui leur devoir de conseil ? Confrontés à une clause de choix de loi en matière familiale, ou peut-être demain, à une clause d’élection de for, quels doivent être les réflexes des magistrats ? [less ▲]

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See detailA two-step methodology for human pose estimation increasing the accuracy and reducing the amount of learning samples dramatically
Azrour, Samir ULg; Pierard, Sébastien ULg; Geurts, Pierre ULg et al

in Advanced Concepts for Intelligent Vision Systems (2017, September)

In this paper, we present a two-step methodology to improve existing human pose estimation methods from a single depth image. Instead of learning the direct mapping from the depth image to the 3D pose, we ... [more ▼]

In this paper, we present a two-step methodology to improve existing human pose estimation methods from a single depth image. Instead of learning the direct mapping from the depth image to the 3D pose, we first estimate the orientation of the standing person seen by the camera and then use this information to dynamically select a pose estimation model suited for this particular orientation. We evaluated our method on a public dataset of realistic depth images with precise ground truth joints location. Our experiments show that our method decreases the error of a state-of-the-art pose estimation method by 30%, or reduces the size of the needed learning set by a factor larger than 10. [less ▲]

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See detailSemantic Background Subtraction
Braham, Marc ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in IEEE International Conference on Image Processing (ICIP), Beijing 17-20 September 2017 (2017, September)

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety ... [more ▼]

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety of challenging scenarios for background subtraction. Our framework combines the information of a semantic segmentation algorithm, expressed by a probability for each pixel, with the output of any background subtraction algorithm to reduce false positive detections produced by illumination changes, dynamic backgrounds, strong shadows, and ghosts. In addition, it maintains a fully semantic background model to improve the detection of camouflaged foreground objects. Experiments led on the CDNet dataset show that we managed to improve, significantly, almost all background subtraction algorithms of the CDNet leaderboard, and reduce the mean overall error rate of all the 34 algorithms (resp. of the best 5 algorithms) by roughly 50% (resp. 20%). Note that a C++ implementation of the framework is available at http://www.telecom.ulg.ac.be/semantic. [less ▲]

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See detailDirection de travail pour la notion du CAPES d'allemand 2018: "langages"
Neelsen, Sarah ULg

Learning material (2017)

Cette direction de travail propose des repères théoriques et chronologiques sur la notion "langages" qui figure au programme du concours de recrutement des enseignant.e.s d'allemand du second degré en ... [more ▼]

Cette direction de travail propose des repères théoriques et chronologiques sur la notion "langages" qui figure au programme du concours de recrutement des enseignant.e.s d'allemand du second degré en France en 2018. Il s'agit d'une notion abordée par en cycle 4 de l'enseignement secondaire français et le document fournit aux candidat.e.s du concours et aux futur.e.s enseignant.e.s des ressources tirées de l'histoire et de la culture des pays de langue allemandes, ainsi que des clefs pour les analyser et réussir l'épreuve de composition. [less ▲]

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See detailDirection de travail pour la thématique du CAPES d'allemand 2018: "je de l'écrivain / jeu de l'écriture"
Neelsen, Sarah ULg

Learning material (2017)

Cette direction de travail propose des repères théoriques et chronologiques sur la thématique "je l'écrivain / jeu de l'écriture" qui figure au programme du concours de recrutement des enseignant.e.s d ... [more ▼]

Cette direction de travail propose des repères théoriques et chronologiques sur la thématique "je l'écrivain / jeu de l'écriture" qui figure au programme du concours de recrutement des enseignant.e.s d'allemand du second degré en France en 2018. Il s'agit d'une thématique du cycle terminal des classes littéraires de l'enseignement secondaire français et le document fournit aux candidat.e.s du concours et aux futur.e.s enseignant.e.s des ressources tirées de la littéraire et des arts des pays de langue allemande, ainsi que des clefs pour les analyser et réussir l'épreuve de composition. [less ▲]

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See detailDamage Detection in Structures Based on Principal Component Analysis of Forced Harmonic Responses
Golinval, Jean-Claude ULg

in Procedia Engineering (2017, September)

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much ... [more ▼]

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. PCA is applied here to the problem of damage detection in structures submitted to harmonic excitation. When processing vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The method is illustrated on the example of a real truss structure for damage detection and is combined to a model updating technique for damage localization. [less ▲]

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See detailIs a Memoryless Motion Detection Truly Relevant for Background Generation with LaBGen?
Laugraud, Benjamin ULg; Van Droogenbroeck, Marc ULg

in Advanced Concepts for Intelligent Vision Systems (2017, September)

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a ... [more ▼]

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a pixel-wise median filter and a patch selection mechanism based on a motion detection performed by a background subtraction algorithm. In our previous works related to LaBGen, we have shown that, surprisingly, the frame difference algorithm provides the most effective motion detection on average. Compared to other background subtraction algorithms, it detects motion between two frames without relying on additional past frames, and is therefore memoryless. In this paper, we experimentally check whether the memoryless property is truly relevant for LaBGen, and whether the effective motion detection provided by the frame difference is not an isolated case. For this purpose, we introduce LaBGen-OF, a variant of LaBGen leverages memoryless dense optical flow algorithms for motion detection. Our experiments show that using a memoryless motion detector is an adequate choice for our background generation framework, and that LaBGen-OF outperforms LaBGen on the SBMnet dataset. We further provide an open-source C++ implementation of both methods at http://www.telecom.ulg.ac.be/labgen. [less ▲]

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See detailNonlinear analysis of compliant deployable structures: modelling, simulation and experimental validation
Dewalque, Florence ULg

Doctoral thesis (2017)

Compliant mechanisms are flexible components which can store elastic energy when deformed and then passively release it to produce a motion. Their scope of applications encompasses various domains from ... [more ▼]

Compliant mechanisms are flexible components which can store elastic energy when deformed and then passively release it to produce a motion. Their scope of applications encompasses various domains from robotic orthoses to microscopes and grippers. In this work, the developments focus on compliant mechanisms called tape springs used in deployable space structures. Tape springs, due to their autonomous deployment capacity from a compact folded configuration, their high stiffness in the deployed equilibrium state and their simplicity of integration, represent efficient alternatives to common motorised hinges for space applications. Thus, they are currently used to deploy appendices on satellites such as solar panels or telescopes and are considered as valuable components in the design of future applications such as solar sails, deployable optics and inflatable structures. However, their structural behaviour is highly nonlinear and quite sensitive to the design parameters and to the various constraints encountered on Earth and in a space environment. The objective of this thesis is thus to develop validated high-fidelity dynamic models of tape springs which can be used to support the design process. The methodology involves the development of advanced finite element models and experimental tests based on an original set-up. First, a quasi-static model based on shell finite elements is established and used to investigate the nonlinear response of tape springs as well as the influence of various geometric parameters. This model is then exploited for the design of tape springs deploying a reflector based on an automatic optimisation procedure. The study is further extended to dynamic analyses, which are characterised by a self-locking of the tape springs in their final deployed configuration. In order to accurately capture these phenomena, the importance of a suitable representation of the physical structural dissipation in the model is demonstrated and, for metallic tape springs, a Kelvin-Voigt model is retained. An experimental set-up is then designed in order to validate the model and its capacity to represent the nonlinear phenomena inherent to tape springs which occur during quasi-static and dynamic tests. The experimental data are acquired by the means of an innovative 3D motion analysis system and a force plate. The reproducibility of the tests is assessed and a procedure, involving several elementary tests, is proposed to identify the parameters of the finite element model, in particular, the structural damping. In the end, a fair correlation between the experimental and numerical results is achieved. The proposed methodology, which relies on numerical and experimental methods, thus leads to a dynamic model of tape springs which can be used to predict their behaviour in various conditions. [less ▲]

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See detail"888" Tweets on the Art and Science of Internet-Based Investing
Choffray, Jean-Marie ULg

E-print/Working paper (2017)

Here we are! Exactly “888” Tweets, regularly updated, on The Art and Science of Investing to “show you the way”, to share some observations on the evolution of the world, the behavior of the financial ... [more ▼]

Here we are! Exactly “888” Tweets, regularly updated, on The Art and Science of Investing to “show you the way”, to share some observations on the evolution of the world, the behavior of the financial markets, and to illustrate the key heuristics that I learned over the last twenty years. As, without any doubt, I am no Warren Buffett, feel free to disagree and develop you own “theory” of investing. Painful and solitary work... Success is at that price! And, based on what I did - and did not! - achieve, it shouldn’t be hard to do much better... That’s my wish for you! [less ▲]

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See detailOnline ICPC-2 & Q-Codes: General Practice / Family Medicine Online Multilingual Terminology & Knowledge Base
Jamoulle, Marc ULg

Conference (2017, August 31)

Availability of ICPC-2 and Q-Codes in URI format

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See detailThe Economic Development Pole (EDP) approach in Niger: the case of the Niger-IFAD Program
Andres, Ludovic ULg; Populin, Martha; Bodé, Sambo et al

Poster (2017, August 29)

Since 2012, the Niger-IFAD Programme uses a new non-administrative geographical intervention unit, the Economic Development Pole (EDP). The EDP is described as a space concentrating economic activities ... [more ▼]

Since 2012, the Niger-IFAD Programme uses a new non-administrative geographical intervention unit, the Economic Development Pole (EDP). The EDP is described as a space concentrating economic activities linked to the production and commercialization of the main agro-pastoral products of the neighbouring production basins. This poster aims to describe and analyze the concept of EDP, to show its first results when put into practice and to analyze its risks. [less ▲]

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See detailUniversité d'été du CIFEN - Atelier 2 :Tâches complexes dans les formations professionnalisantes
Francois, Nathalie ULg; Simons, Germain ULg

Conference (2017, August 25)

Introduction et synthèse de l'atelier consacré aux tâches complexes dans les sections professionnalisantes de différents niveaux d'enseignement en Fédération Wallonie Bruxelles.

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See detailPrésentation de la thématique de recherche et du programme de la journée
Simons, Germain ULg

Conference (2017, August 25)

Dans cette introduction, G. Simons montre comment la notion de "tâche complexe" s'est construite progressivement en Communauté française de Belgique depuis le Décret "Missions". Ensuite il propose ... [more ▼]

Dans cette introduction, G. Simons montre comment la notion de "tâche complexe" s'est construite progressivement en Communauté française de Belgique depuis le Décret "Missions". Ensuite il propose différentes questions qui baliseront la réflexion tout au long de la journée. Enfin, il présente le programme du colloque et remercie toutes les personnes qui ont contribué à son organisation. [less ▲]

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See detailPreservation protocol for dimethylsulfoniopropionate and dimethylsulfoxide analysis in plant material of the Mediterranean seagrass Posidonia oceanica, and re-evaluation of dimethylsulfoniopropionate leaf content
Borges, Alberto ULg; Champenois, Willy ULg

in Aquatic Botany (2017), 143C

We tested three treatments to preserve Posidonia oceanica leaves for the analysis of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO): oven dried at 60 °C for 24 h, frozen at −20 °C, and ... [more ▼]

We tested three treatments to preserve Posidonia oceanica leaves for the analysis of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO): oven dried at 60 °C for 24 h, frozen at −20 °C, and frozen-in-ice and kept at −20 °C. The DMSP content was analyzed by proxy as dimethylsulfide (DMS) by gas chromatography after alkaline cleavage at room-temperature. The DMSP leaf content of P. oceanica in samples that were oven dried at 60 °C for 24 h, then stored at room temperature decreased by 87% over 80 days of storage and then remained stable for about 88 additional days compared to the control. The DMSO leaf content of P. oceanica in samples that were oven dried increased nine-fold after 198 days of storage following drying compared to the control. Both the DMSP and DMSO leaf content of P. oceanica remained stable for 198 days compared to the control with frozen and frozen-in-ice treatments, which we both recommend as adequate protocols to preserve P. oceanica tissues for DMS(P,O) analysis. The annual average DMSP leaf content of P. oceanica at 10 m in the Bay of Calvi (Corsica, France) was 205 ± 58 μmol g−1 (fresh weight) based on samples preserved frozen, two orders of magnitude higher than the value we previously reported based on samples that were oven dried. The newly determined DMSP leaf content allows ranking P. oceanica as the highest DMSP producer reported to date among marine and inter-tidal autotrophs. [less ▲]

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See detailGroundless altruism: Why it makes sense to risk one's life for other people's money
Dumitru, Magdalena ULg; Joergensen, Gitte

Conference (2017, August 22)

In a study where participants were asked to make a series of assessments in distinct circumstances, we show that altruistic agents may incur disadvantages in the name of values they do not believe in (i.e ... [more ▼]

In a study where participants were asked to make a series of assessments in distinct circumstances, we show that altruistic agents may incur disadvantages in the name of values they do not believe in (i.e., saving money) as long as they believe in the overarching category (e.g., it is a ‘good deed’ to recover other people’s money). Whereas previous research mostly targeted ultimate benefits (i.e., whether or not altruistic agents incur real disadvantages), the axiological basis of altruistic acts (i.e., whether or not they have the same worth to self and to others) has remained unchallenged. Here, we explored “groundless altruism” by asking participants to rate their agreement with the statement ‘Money is worth risking my life for’ before and after presenting them with an altruistic scenario. There was a dramatic increase in the proportion of ‘yes’ responses from the first to the second rating. Moreover, as predicted by the cultural group selection theory, the status of the agent (low-rank police employee v s. secret agent) was largely irrelevant. These findings suggest that social constructs such as categorisation have the potential to significantly influence human behaviour in various domains from moral psychology to work ethics to language learning. [less ▲]