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See detailComparison of local outliers detection techniques in spatial multivariate data
Ernst, Marie ULg; Haesbroeck, Gentiane ULg

E-print/Working paper (2016)

Outlier detection techniques in spatial data should allow to identify two types of outliers: global and local ones. Local outliers typically have non-spatial attributes that strongly differ from those ... [more ▼]

Outlier detection techniques in spatial data should allow to identify two types of outliers: global and local ones. Local outliers typically have non-spatial attributes that strongly differ from those observed on their neighbors. Detecting local outliers requires to be able to work locally, on neighborhoods, in order to take into account the spatial dependence between the statistical units under consideration, even though the outlyingness is usually measured on the non-spatial variables. Many procedures have been outlined in the literature, but their number reduces when one wants to deal with multivariate non-spatial attributes. In this paper, focus is on the multivariate context. A review of existing procedures is done. A new approach, based on a two-step improvement of an existing one, is also designed and compared with the benchmarked methods by means of examples and simulations. [less ▲]

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See detailTropospheric water vapour isotopologue data (H216O, H218O and HD16O) as obtained from NDACC/FTIR solar absorption spectra
Barthlott, Sabine; Schneider, Matthias; Hase, Frank et al

in Earth System Science Data Discussions (2016)

We report on the ground-based FTIR (Fourier Transform InfraRed) tropospheric water vapour isotopologue remote sensing data that have been recently made available via the database of NDACC (Network for the ... [more ▼]

We report on the ground-based FTIR (Fourier Transform InfraRed) tropospheric water vapour isotopologue remote sensing data that have been recently made available via the database of NDACC (Network for the Detection of Atmospheric Composition Change; ftp://ftp.cpc.ncep.noaa.gov/ndacc/MUSICA/) and via doi:10.5281/zenodo.48902. Currently, data are available for 12 globally distributed stations. They have been centrally retrieved and quality filtered in the framework of the MUSICA project (MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water). We explain particularities of retrieving the water vapour isotopologue state (vertical distribution of H162O, H182O and HD16O) and reveal the need for a new meta-data template for archiving such FTIR isotopologue data. We describe the format of different data components and give recommendations for correct data usage. Data are provided as two data types. The first type is best-suited for tropospheric water vapour distribution studies disregarding different isotopologues (comparison with radiosonde data, analyses of water vapour variability and trends, etc.). The second type is needed for analysing moisture pathways by means of {H2O,delta-D}-pair distributions. [less ▲]

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See detailRéparation des bétons: principes, matériaux et techniques
Courard, Luc ULg

Scientific conference (2016, April 26)

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See detailÉdition critique de Gerard du Frattre. Quelques remarques sur les pratiques philologiques actuelles
Lambert, Adélaïde ULg

Conference given outside the academic context (2016)

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See detailTemps linéaire – temps multiples. Réinterroger les temporalités d’une diplomatie.
Regibeau, Julien ULg

Scientific conference (2016, April 26)

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See detailComputerized Adaptive Testing
Braeken, Johan; Magis, David ULg; Stillwell, David

Scientific conference (2016, April 25)

Why ask a person to answer a problem item, when you a priori know they won’t be able to solve it? It is a waste of time and resources, and you won’t gain any new information; this is both inefficient and ... [more ▼]

Why ask a person to answer a problem item, when you a priori know they won’t be able to solve it? It is a waste of time and resources, and you won’t gain any new information; this is both inefficient and ineffective. In contrast, computerized adaptive testing (CAT) is based on the principle that more information can be gained when one tailors the test towards the level of the person being tested. Computational and statistical techniques from item response theory (IRT) and decision theory are combined to implement a test that can behave interactively during the test process and adapts towards the level of the person being tested.The implementation of such a CAT relies on an iterative sequential algorithm that searches the pool of available items (a so-called item bank) for the optimal item to administer based on the current estimate of the person’s level (and optional external constraints). The subsequent response on this item provides new information to update the person’s proficiency estimate. This selection-responding-updating process continues until specified stop criteria have been reached. The consequence of such an adaptive test administration is that you get an individualized tailored test that is more efficient and more effective. Because you have less of a mismatch between the level of the test and the level of the test taker, there is a lesser burden for the latter and a higher precision for the former, and this with fewer items than a traditional fixed item-set test format. Furthermore, because it is computerized and sequential, test performance can be continuously monitored and reported directly after test completion. Item response models come into play to ensure comparable scores of these individual tailored tests by putting them on the same measurement scale and to precalibrate,the psychometric parameters of the items that are part of the item bank on which the sequential iterative algorithm operates. The workshop intends to tackle issues encountered during the setup of a computerized adaptive test, starting from the design towards the actual delivery of a CAT. [less ▲]

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See detailNovel approaches for preventing acute graftversus- host disease after allogeneic hematopoietic stem cell transplantation
SERVAIS, Sophie ULg; BEGUIN, Yves ULg; Delens, Loïc ULg et al

in Expert Opinion on Investigational Drugs (2016)

Introduction Allogeneic hematopoietic stem cell transplantation (alloHSCT) offers potential curative treatment for a wide range of malignant and nonmalignant hematological disorders. However, its success ... [more ▼]

Introduction Allogeneic hematopoietic stem cell transplantation (alloHSCT) offers potential curative treatment for a wide range of malignant and nonmalignant hematological disorders. However, its success may be limited by post-transplant acute graft-versus-host disease (aGVHD), a systemic syndrome in which donor’s immune cells attack healthy tissues in the immunocompromised host. aGVHD is one of the main causes of morbidity and mortality after alloHSCT. Despite standard GVHD prophylaxis regimens, aGVHD still develops in approximately 40–60% of alloHSCT recipients. Areas covered In this review, after a brief summary of current knowledge on the pathogenesis of aGVHD, the authors review the current combination of a calcineurin inhibitor with an antimetabolite with or without added anti-thymocyte globulin (ATG) and emerging strategies for GVHD prevention. Expert opinion A new understanding of the involvement of cytokines, intracellular signaling pathways, epigenetics and immunoregulatory cells in GVHD pathogenesis will lead to new standards for aGVHD prophylaxis allowing better prevention of severe aGVHD without affecting graft-versus-tumor effects. [less ▲]

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See detailValidity of algometry and video assessment to diagnose pain in sheep with knee synovitis
Niessen, J; Nisolle, JF; Hontoir, F et al

Poster (2016, April 23)

Reasons to perform study. To assess lameness in animals, semi-objective scales are used. Video is sometimes used to enable blinding of the clinician. In addition, the assessment of pain is particularly ... [more ▼]

Reasons to perform study. To assess lameness in animals, semi-objective scales are used. Video is sometimes used to enable blinding of the clinician. In addition, the assessment of pain is particularly difficult in animals since they cannot report their feelings. The interpretation of the reactions of the animals can be different between observers. A method to quantify pain is the measure of mechanical nociceptive thresholds (MNT), a method called algometry. Since synovitis is often linked to swelling of periarticular tissues and to synovial fluid effusion, palpation of the joint is also a useful test. The objectives of the current study were to assess in sheep whether (1) video assessment of lameness is in agreement with real observation; (2) algometry of the knee is correlated with lameness evaluation; (3) algometry is correlated with identification of swelling by palpation. Material and methods. The population of sheep enrolled in a controlled trial at the Ovine Research Center of UNamur was used for the current study. Results. There was a moderate inter-rater agreement (value of kappa was 0,41) between the experimenter who evaluated the ewes on site and the one who watched the videos. No significant correlation was identified between lameness scores and algometry. A negative correlation (algometry reactive threshold is lower when palpation score is higher) was identified between palpation scores and MNT (P<0.05). Discussion. Video assessment can be used in research to assess lameness. The experience of the observer must be taken into account. Algometry is not entirely valid since an adaptation or learning process seems to develop in sheep. [less ▲]

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See detailNégocier avec un corps virtuel. Étude de la relation au corps dans le jeu vidéo
Delbouille, Julie ULg

Scientific conference (2016, April 22)

Interface essentielle entre le joueur et l’univers vidéoludique, l'avatar soulève la question du rapport au corps dans le jeu vidéo. En effet, la fonction d’incarnation permise par l’avatar – et qui est ... [more ▼]

Interface essentielle entre le joueur et l’univers vidéoludique, l'avatar soulève la question du rapport au corps dans le jeu vidéo. En effet, la fonction d’incarnation permise par l’avatar – et qui est soulignée par l’étymologie même du terme – ajoute à la relation entre le corps et l’esprit du joueur une dimension nouvelle : celle du corps virtuel, qui déploie sa matérialité propre au sein de l’univers fictionnel. Ce corps « autre », dont le joueur prend possession, constitue une des conditions de son « insertion » dans le monde virtuel. Fondée sur une approche communicationnelle et nourri d’un pan de la pensée phénoménologique (à travers, notamment, la Phénoménologie de la perception de Maurice Merleau-Ponty), cette intervention entend questionner la problématique du rapport au corps au sein de l’univers du jeu. [less ▲]

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See detailJustiz und Recht in Eupen-Malmedy (1940-1944)
Brüll, Christoph ULg

Conference given outside the academic context (2016)

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See detailHigh anthocyanins content of commercial blackcurrant juices induced endothelium-dependent relaxation in isolated porcine coronary arteries
Kevers, Claire ULg; Shini-Kerth, Valérie; Tabart, Jessica et al

Poster (2016, April 22)

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See detailEffect of Ribes nigrum leaf extracts on endothelium-dependent vasorelaxation
Tabart, Jessica; Shini-Kerth, Valérie; PINCEMAIL, Joël ULg et al

Poster (2016, April 22)

Detailed reference viewed: 12 (3 ULg)
See detailDu jeu au détournement : quel type d’écart ?
Barnabé, Fanny ULg

Scientific conference (2016, April 22)

L'approche du jeu vidéo, non sous l’angle de la technique ou de l'étude des joueurs, mais comme un ensemble de pratiques et de phénomènes culturels, donne lieu à un double mouvement : d'une part la ... [more ▼]

L'approche du jeu vidéo, non sous l’angle de la technique ou de l'étude des joueurs, mais comme un ensemble de pratiques et de phénomènes culturels, donne lieu à un double mouvement : d'une part la reconnaissance d'une culture commune qui fait médiation et d'autre part la création d'écarts de différentes natures entre les acteurs, les discours et les esthétiques : écarts de légitimité entre des pratiques ludiques instituées et d’autres plus périphériques (sur lesquelles se centreront les présentes communications), écarts rhétoriques produits par les joueurs qui se réapproprient les œuvres vidéoludiques pour les détourner, écarts identitaires présents dans les discours des amateurs, qui se définissent par des stratégies de distinction (par rapport aux professionnels, aux artistes, etc.) et écarts posturaux, mobilisés par les différents acteurs de la presse vidéoludique afin de se singulariser – notamment pour permettre une existence économique. Cet ensemble de problématiques seront traitées au sein d’un panel de communications, à travers différentes perspectives disciplinaires : la rhétorique et la sémiotique, la sociologie de la littérature et l’analyse des réseaux, et l’approche communicationnelle inspirée des « cultural studies ». [less ▲]

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See detailUsing a dynamic vegetation model for future projections of crop yields : application to Belgium in the framework of the VOTES and MASC projects
Jacquemin, Ingrid ULg; Henrot, Alexandra-Jane ULg; Fontaine, Corentin M. et al

Poster (2016, April 22)

Dynamic vegetation models (DVM) were initially designed to describe the dynamics of natural ecosystems as a function of climate and soil, to study the role of the vegetation in the carbon cycle. These ... [more ▼]

Dynamic vegetation models (DVM) were initially designed to describe the dynamics of natural ecosystems as a function of climate and soil, to study the role of the vegetation in the carbon cycle. These models are now directly coupled with climate models in order to evaluate feedbacks between vegetation and climate. But DVM characteristics allow numerous other applications, leading to amelioration of some of their modules (e.g., evaluating sensitivity of the hydrological module to land surface changes) and developments (e.g., coupling with other models like agent-based models), to be used in ecosystem management and land use planning studies. It is in this dynamic context about DVMs that we have adapted the CARAIB (CARbon Assimilation In the Biosphere) model. One of the main improvements is the implementation of a crop module, allowing the assessment of climate change impacts on crop yields. We try to validate this module at different scales: - from the plot level, with the use of eddy-covariance data from agricultural sites in the FLUXNET network, such as Lonzée (Belgium) or other Western European sites (Grignon, Dijkgraaf,. . . ), - to the country level, for which we compare the crop yield calculated by CARAIB to the crop yield statistics for Belgium and for different agricultural regions of the country. Another challenge for the CARAIB DVM was to deal with the landscape dynamics, which is not directly possible due to the lack of consideration of anthropogenic factors in the system. In the framework of the VOTES and the MASC projects, CARAIB is coupled with an agent-based model (ABM), representing the societal component of the system. This coupled module allows the use of climate and socio-economic scenarios, particularly interesting for studies which aim at ensuring a sustainable approach. This module has particularly been exploited in the VOTES project, where the objective was to provide a social, biophysical and economic assessment of the ecosystem services in four municipalities under urban pressure in the center of Belgium. The biophysical valuation was carried out with the coupled module, allowing a quantitative evaluation of key ecosystem services as a function of three climatic and socio-economic scenarios. [less ▲]

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See detailSize and Value Matter But Not the Way You Thought
Lambert, Marie ULg; Fays, Boris ULg; Hübner, Georges ULg

Scientific conference (2016, April 22)

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See detailCOP21 : le grand enfumage
Alaluf, Mateo; Bayot, Bernard; Brouyaux, Antoinette et al

Article for general public (2016)

C’est à partir de ce vendredi que l’accord sur le climat obtenu en décembre dernier est ouvert à la signature. Entre les intentions annoncées et les moyens mis en œuvre par les Etats pour les atteindre ... [more ▼]

C’est à partir de ce vendredi que l’accord sur le climat obtenu en décembre dernier est ouvert à la signature. Entre les intentions annoncées et les moyens mis en œuvre par les Etats pour les atteindre, il subsiste un gouffre. Et la réalité est inquiétante. [less ▲]

Detailed reference viewed: 21 (1 ULg)