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See detailDetection of eye movements specific to drowsiness and their relation with subjective assessment of sleepiness in PVT: A cognitive ergonomic approach
Blavier, Adelaïde ULg; Montagnino, Cédric; Wertz, Jérôme ULg et al

Conference (2014, February 24)

Drowsiness is one of the major factors explaining accidents, particularly in traffic accidents but also in work situations with serious consequences (e.g. medicine). The drowsiness may be assessed by ... [more ▼]

Drowsiness is one of the major factors explaining accidents, particularly in traffic accidents but also in work situations with serious consequences (e.g. medicine). The drowsiness may be assessed by diverse measures that vary from physiological and unconscious data (e.g. EEG) to subjective and conscious evaluation. In their daily life, people are used to evaluate their drowsiness by subjective assessment and research observes a great inter-individual variation in this evaluation. Moreover, the subjective evaluation is dependent on the situation and the risk perceived by the person (e.g., new versus usual situations, simple versus complex environments, etc.). In this theoretical context, our purpose was to investigate the links between 1) objective performance (reaction time) measured by a psychomotor vigilance task (PVT), 2) data from eye movements and 3) subjective assessment of drowsiness (measured with Karolinska Sleepiness Scale, KSS). 12 persons, aged from 20 to 56, participated individually. They were asked to respect a 60% sleep deprivation during the night before the experiment and to not drink any energy drinks the day of the experiment. The experiment was conducted between 1 and 3 PM after a heavy lunch in order to increase the circadian effect. Moreover, the temperature of the room was 25° in order to increase drowsiness. Each participant was asked to perform 4 PVT. However, although 100% of participants performed the first two PVT, only 66% were able to perform the third PVT and only 33% of participants performed the fourth and last PVT. Our results showed an effect of time on objective performance, eye movements and subjective assessment of drowsiness in PVT 1 and 2: significant increase of reaction time, increase of eye closure and perclos, reduction of pupil diameter and increase of subjective drowsiness estimation (KSS). Only the frequency and duration of blinks remained constant across time. In PVT 3 and 4, data from eye movements and objective performance (reaction time) did not vary anymore across the time. Only the subjective estimation of drowsiness (KSS) continued to increase. Furthermore, subjective estimation of drowsiness was differently correlated with eye movements and objective performance across the PVT; it was significantly correlated with reaction time (PVT 1,2,3), blink frequency and duration (PVT 1,2,3), perclos (PVT 1,2,3,4), eye closure (PVT 2,3), pupil diameter (PVT 1,2,3,4). These results are discussed and integrated in an ergonomic approach in order to analyze the links between objective performance, eye movements and subjective assessment of drowsiness. [less ▲]

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See detailcompte rendu de : Paul Schubert, Pierre Ducrey, Pascale Derron (ed.), Les Grecs héritiers des Romains
Rochette, Bruno ULg

in Bryn Mawr Classical Review [=BMCR] (2014)

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See detailLes parents homos et leurs enfants: stress, résilience et pistes de travail clinique
D'Amore, Salvatore ULg

Scientific conference (2014, February 24)

La famille contemporaine connaît jour après jour d’incessantes mutations et un accroissement de sa diversité – tant au niveau de sa composition, de la culture, que de l’orientation culturelle de ses ... [more ▼]

La famille contemporaine connaît jour après jour d’incessantes mutations et un accroissement de sa diversité – tant au niveau de sa composition, de la culture, que de l’orientation culturelle de ses membres. Les assemblages kaléidoscopiques entres ces trois grandes dimensions contribuent à la genèse d’une multiplicité de constellations affectives que nous appelons aussi nouvelles familles. Ces variations sur le thème imposent au clinicien la nécessité de déconstruire certaines idées, idéaux et idéalisations du couple et de la famille au profit d’une progressive reconnaissance des différentes possibilités et potentialités des nouveaux liens affectifs et de filiation. Dans ce contexte, les familles homoparentales représentent un laboratoire pour repenser l’identité du “familial » et les changements multiples que toute famille, traditionnelle incluse, est en train d’expérimenter. D’ailleurs, les couples et les familles avec parents LGBT (lesbiens, gays, bisexuels et transgenres) deviennent de plus en plus visibles et demandeuses de reconnaissance, non seulement juridique mais aussi psychologique, sociale, culturelle, civile et morale. De nombreuses études montrent, désormais, que les familles homoparentales sont des contextes de développement tout à fait adéquats et qui répondent aux besoins évolutifs de leurs enfants. Il reste néanmoins toute une série de grandes questions qui doivent être prises en considération, comme par exemple les effets de la discrimination, de l’homophobie sociale et intériorisée, de l’ambiguïté relationnelle (liée au manque de reconnaissance légale et à l’absence de modèles sociaux et culturels) ainsi que du faible support social que les enfants et leur famille peuvent expérimenter. La gestion du stress à l’interface des multiples systèmes d’appartenance reste un défi constant tant pour les parents que pour les enfants. Les différentes transitions à la parentalité que chaque trajectoire comporte, soulèvent une série de questions qui peuvent faire l’objet d’une demande de thérapie (ex. la gestion du coming out avec les enfants, la relation avec les familles d’origine, les éventuels conflits avec l’ex-époux/se s’il y a eu une précédente union hétérosexuelle, les craintes du parent non-biologique de perdre les droits parentaux en cas de divorce, la maladie ou mort du parent biologique, la gestion de l’accès aux origines chez l’enfant conçu par insémination alternative ou par mère porteuse, etc) Dans le cadre de ce séminaire, nous aborderons les défis que les familles homoparentales vivent quotidiennement et les questions qu’elles peuvent poser à toutes ces personnes qui seront amenées à rencontrer ces nouvelles familles. [less ▲]

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See detailLa transmission entre générations de l'héritage culturel et migratoire.
Mescoli, Elsa ULg

Conference given outside the academic context (2014)

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See detailAssessing the Thermal Performance of Bedouin Tents in Hot Climates
Attia, Shady ULg

in ASHRAE Energy & Indoor Environment for Hot Climates (2014, February 24)

The aims of this study it to improve conditions inside Bedouin tents shelters and to develop tools to assess shelter quality and comfort. A prototype tent was tested in hot conditions with an internal ... [more ▼]

The aims of this study it to improve conditions inside Bedouin tents shelters and to develop tools to assess shelter quality and comfort. A prototype tent was tested in hot conditions with an internal vapor load. Temperature, humidity measurements and air speed were taken inside the shelter while the external temperature was maintained at 40°C (104°F). Building performance simulation was conducted to produce a simulation model. A model of a tent was constructed using the EnergyPlus simulation software and were calibrated with the test data. The shelter models were simulated in Wadi Rum, Jordan using real data from. The feasibility of heating the tent using only the casual gains from occupants and solar radiation was investigated, although it was found that a tent heated in this way would only be appropriate in spring and autumn. Design issues included coping with stratification of air temperature inside the tent, improving thermal comfort without compromising fabricating the materials cheaply and simply. The validity of the results is limited by the lack of measured data for rates of air infiltration. [less ▲]

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See detailStrategic Decision Making For Zero Energy Buildings in Jordan
Attia, Shady ULg; Zawaydeh, Samer

in Proceedings of the 1st International Conference on Energy & Indoor Environment for Hot Climates (2014, February 24)

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Jordanian residential building sector. A representative ... [more ▼]

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Jordanian residential building sector. A representative house prototype, located in Amman is selected as a case study for the zero energy design and performance objective. The aim of the study is to investigate the potential of achieving thermal comfort and delivering thermal and electrical energy demands for existing buildings on site for different Jordanian Cities. Jordan has a semi-arid climate with an annual total irradiation above 2000 bankable kWh/m2 per year with approximately 2000 hours of full sunshine. Therefore, different passive and active design strategies are discussed and compared to reach an annual net zero energy demand for the existing building stock. In order to achieve zero energy buildings certain strategies are examined. For example, internal loads reduction, envelope insulation in addition to the installation of solar water heater and photovoltaic. Based on a month-by–month demand analysis, internal loads and envelope performance are analyzed in order to explore the existing economical potential. Simulation software DesignBuilder is used to examine the strategies proposed to achieve annual net zero energy performance for a prototype. The final result of this study compares the potential and constraints of each strategy and assesses them based on economical feasibility. For the considered location and weather conditions the prototype can provide thermal comfort for occupants and meets the zero energy objectives. The research also proofs that some strategies are cost effective rewarding with a payback period ranging from 3 to 9 years. [less ▲]

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See detailInvestigating the Impact of Different Thermal Comfort Models for Zero Energy Buildings in Hot Climates
Attia, Shady ULg; Hensen, JLM

in Proceeding of: Conference on Energy and Indoor Environment for Hot Climates (2014, February 24)

The selection of a thermal comfort model has a major impact on energy consumption of Net Zero Energy Buildings (NZEBs) in hot climates. The objective of this paper is to compare the influence of using ... [more ▼]

The selection of a thermal comfort model has a major impact on energy consumption of Net Zero Energy Buildings (NZEBs) in hot climates. The objective of this paper is to compare the influence of using different comfort models for zero energy buildings in hot climates. The paper compares the impact of applying Givoni’s model, ASHRAE 55 adaptive comfort standard, EN 15251 adaptive comfort standard and EN ISO 7730 on energy consumption and comfort. Using ZEBO and EnergyPlus for energy simulation, an existing prototype of a residential apartment module will be used to evaluate energy performance and thermal comfort in two parametric series. The first one is the result of coupling natural ventilation and mechanical cooling and the second one is guided coupling natural ventilation, mechanical cooling and ceiling fans. Results show a significant difference of cooling loads and total energy generation for the compared comfort models. However, the study remains theoretical and requires post occupancy evaluation for a better reliability of the results. [less ▲]

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See detailThe Usability of Green Building Rating Systems in Hot Arid Climates
Attia, Shady ULg

in ASHRAE Energy & Indoor Environment for Hot Climates (2014, February 24)

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison ... [more ▼]

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison analysis showed that the four examined rating systems namely, Green Pyramid Rating System (Egypt), Green Building Standard SI 5281 (Israel), Qatar Sustainability Assessment System (QSAS) and Pearl Building Rating System (UAE) are not enough adopted to local environmental, cultural, historical, societal and economic context. They showed also a comparable similarity since they all imitate the American LEED and British BREEAM rating systems. The paper elaborates on the comparison results and presents recommendations to improve the questioned rating systems and remind designers with the principles and strategies of sustainable design that goes beyond the existing rating systems in hot climate. The evaluation of the four systems might provide a new approach for regional harmonization among the four systems and the development of adaptable and context sensitive rating system. [less ▲]

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See detailGradient Boosted Regression Trees in Scikit-Learn
Prettenhofer, Peter; Louppe, Gilles ULg

Conference (2014, February 23)

This talk describes Gradient Boosted Regression Trees (GBRT), a powerful statistical learning technique with applications in a variety of areas, ranging from web page ranking to environmental niche ... [more ▼]

This talk describes Gradient Boosted Regression Trees (GBRT), a powerful statistical learning technique with applications in a variety of areas, ranging from web page ranking to environmental niche modeling. GBRT is a key ingredient of many winning solutions in data-mining competitions such as the Netflix Prize, the GE Flight Quest, or the Heritage Health Price. We give a brief introduction to the GBRT model and regression trees -- focusing on intuition rather than mathematical formulas. The majority of the talk is dedicated to an in depth discussion how to apply GBRT in practice using scikit-learn. We cover important topics such as regularization, model tuning and model interpretation that should significantly improve your score on Kaggle. [less ▲]

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See detailHypoxia and biogeochemical processes concurrently impact acidification in a seasonally stratified coastal marine lake
Hagens, M; Slomp, CP; Meysman, FJR et al

Conference (2014, February 23)

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See detailPropos sur le Zinc
Pirard, Eric ULg

Conference given outside the academic context (2014)

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See detail1er Colloque Guy Namurois : Livre des résumés
Jidovtseff, Boris ULg; Halleux, Philippe; Lambert, Eric et al

in Jidovtseff, Boris (Ed.) 1er Colloque Guy Namurois : Livre des résumés (2014, February 22)

Colloque multi-disciplinaire en l'honneur de Guy Namurois

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See detailUtilisation d'une application internet pour quantifier la charge de travail chez le rugbyman de haut niveau
Paulus, Julien ULg; Laly, Arnaud; Guns, Sébastien et al

in Jidovtseff, Boris; Halleux, Philippe; Lambert, Eric (Eds.) Livre des résumés (2014, February 22)

La détection précoce du dépassement (over-reching) (et du syndrôme de surentrainement) est capitale compte-tenu de ses effets négatifs sur la performance. Dans ce processus, le contrôle individuel de la ... [more ▼]

La détection précoce du dépassement (over-reching) (et du syndrôme de surentrainement) est capitale compte-tenu de ses effets négatifs sur la performance. Dans ce processus, le contrôle individuel de la charge d'entrainement du joueur est indispensable. [less ▲]

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See detailLe Brésil dans le monde
Santander, Sébastian ULg

Scientific conference (2014, February 21)

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