References of "2012"
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See detailUse of graphical modality in a collaborative design distant setting
Safin, Stéphane ULg; Juchmes, Roland ULg; Leclercq, Pierre ULg

in Work: A Journal of Prevention, Assessment and Rehabilitation (2012), Supplement 1

In this paper, we present an original environment, the Distributed Collaborative Design Studio (DCDS) which allows multimodal real-time remote exchanges, and which aims at re-creating remotely the ... [more ▼]

In this paper, we present an original environment, the Distributed Collaborative Design Studio (DCDS) which allows multimodal real-time remote exchanges, and which aims at re-creating remotely the conditions of co-present meetings. This environment associates a videoconference tool (supporting verbal and non-verbal communication) and an original real-time shared digital hand-drawn sketches system (supporting graphical communication). The users can import documents and annotate them in real-time at distance. In this paper, we are interested in studying the use of the graphical modality (digital sketch and document annotations) as a tool for collective design and remote communication. This study takes place in the framework of a collaborative architectural design studio, which has taken place during 3 month, and gathering students from Belgium and France to work together in 3 small groups mainly at distance. The study focuses on the role of graphical modality in the synchronous remote meetings supported by the DCDS. We identify the types of digital annotations made on the imported document, thanks to the electronic pen, and their role in the cognitive processes of designing and in the collaboration and communication processes. We also identify the different practices of digital sketching, according to the group and its collaborative strategies. We discuss the utility of the graphical modality as an efficient support for collaborative synchronous activities and show that the DCDS environment supports different strategies of collaborative design (co-design and distributed design). We conclude on recommendations for improving the system and for designing sketch-based collaborative environments. [less ▲]

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See detailRepeated cycles of DSS inducing a chronically relapsing inflammation: A novel model to study fibrosis using in vivo MRI T2 relaxometry
Breynaert, C; Dresselaers, T; Cremer, J et al

Poster (2012, February)

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See detailPsychomotor disadaptation syndrome: a poorly known clinical entity
lepage, stéphanie; GILLAIN, Sophie ULg; Petermans, Jean ULg

in Revue Médicale de Liège (2012), 67(2), 75-80

Le Syndrome de Désadaptation PsychoMotrice (SDPM) représente une entité clinique typiquement gériatrique. Il regroupe des troubles posturaux tels que la rétropulsion du corps, des troubles de la marche ... [more ▼]

Le Syndrome de Désadaptation PsychoMotrice (SDPM) représente une entité clinique typiquement gériatrique. Il regroupe des troubles posturaux tels que la rétropulsion du corps, des troubles de la marche peu spécifiques, des signes neurologiques comme une akinésie axiale et une hypertonie, ainsi que des troubles psychocomportementaux proches de ceux retrouvés dans la dépression. Son diagnostic repose tant sur la clinique que sur les données iconographiques. Ce syndrome cause des chutes qui occasionnent un sentiment d’insécurité chez la personne âgée. Celle-ci se dévalorise, risque de se replier sur elle-même et de perdre son autonomie et tout contact social. Dans cet article, nous évoquerons brièvement la physiopathologie, tenterons de rappeler les outils diagnostiques et proposerons une prise en charge des patients souffrant de ce syndrome. [less ▲]

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See detailLes quotas
Stone, Pete; Cornet, Annie ULg; Cusumano, Christophe ULg

in Peretti, Jean Marie (Ed.) L'encyclopédie de la Diversité: regards croisés (2012)

Within the framework of policies to promote the diversity, the use of quota is more and more discussed, what besides brings to the foreground tensions about this issue. There is no uniform model about ... [more ▼]

Within the framework of policies to promote the diversity, the use of quota is more and more discussed, what besides brings to the foreground tensions about this issue. There is no uniform model about that in the European countries. This article realizes an inventory of fixtures, in Belgium and in France, on the laws concerning the usage of the quota and the arguments (positive and negatives) in this issue. This research participates to show that the development of the quote in Europe joins in the passage of a regulation " soft law " towards one " hard law ". [less ▲]

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See detailSubproblem Approach for Thin Shell Dual Finite Element Formulations
Dang, Quoc Vuong ULg; Dular, Patrick ULg; Vazquez Sabariego, Ruth ULg et al

in IEEE Transactions on Magnetics (2012), 48(2), 407-410

A subproblem technique is applied to dual thin shell finite element formulations. Both the magnetic vector potential and magnetic field formulations are considered. The subproblem approach developed ... [more ▼]

A subproblem technique is applied to dual thin shell finite element formulations. Both the magnetic vector potential and magnetic field formulations are considered. The subproblem approach developed herein couples three problems: a simplified model with only inductors, a thin region problem using approximate interface conditions and a correction problem to improve the accuracy of the thin shell approximation, in particular near their edges and corners. Each problem has its own geometry and is solved on its associated finite element mesh. [less ▲]

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See detailElectromagnetic absorption properties of carbon nanotube nanocomposite foam filling honeycomb waveguide structures
Quiévy, Nicolas; Bollen, Pierre; Thomassin, Jean-Michel ULg et al

in IEEE Transactions on Electromagnetic Compatibility (2012), 24(1), 43-51

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential ... [more ▼]

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential. Electromagnetic modeling and experimental characterization of the hybrids proved that the honeycomb, acting as a hexagonal waveguide, improves the absorption properties in the gigahertz range above the cutoff frequency. The electromagnetic absorption can be tuned by changing the hybrid material properties. The required levels of electrical conductivity are attained owing to the dispersion of low amounts (1–2 wt%) of carbon nanotubes inside the polymermatrix. The combination of the foam and honeycomb architecture contributes to decrease the real part of the relative effective permittivity Re{εr,eff }. Varying the cell shape of the honeycomb changes the frequency range for high absorption. An analytical model for the absorption has been developed, showing good agreement with the experimental results. [less ▲]

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See detailA leader-follower game in competitive facility location
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

in Computers & Operations Research (2012), 39(2), 437-448

We address the problem of locating new facilities of a firm or franchise that enters a market where a competitor operates existing facilities. The goal of the new entrant firm is to decide the location ... [more ▼]

We address the problem of locating new facilities of a firm or franchise that enters a market where a competitor operates existing facilities. The goal of the new entrant firm is to decide the location and attractiveness of its new facilities that maximize its profit. The competitor can react by opening new facilities, closing existing ones, and adjusting the attractiveness levels of its existing facilities, with the aim of maximizing its own profit. The demand is assumed to be aggregated at certain points in the plane and the new facilities of both the firm and the competitor can be located at predetermined candidate sites. We employ the gravity-based rule in modeling the behavior of the customers where the probability that a customer visits a certain facility is proportional to the facility attractiveness and inversely proportional to the distance between the facility site and demand point. We formulate a bilevel mixed-integer nonlinear programming model where the firm entering the market is the leader and the competitor is the follower. We propose heuristics that combine tabu search with exact solution methods. [less ▲]

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2012)

Survivantes; Kepler-20 et KOI-961;Êta Carinae; Exo-Saturne ? ; GRAIL; Tranquillityite; H1743-322; Matière noire; ACT-CL J0102-4915; Nébuleuse Oméga

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See detailLa cécidomyie équestre : un ravageur à tenir à l'oeil
Censier, Florence ULg; Chavalle, Sandrine; De Proft, Michel et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2012, February)

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See detailInvisible computer for collaborative design : evaluation of a multimodal sketch-based environment
Defays, Aurore ULg; Safin, Stéphane ULg; Darses, Françoise et al

in Work: A Journal of Prevention, Assessment and Rehabilitation (2012), Supplement 1

In the areas of design, especially in architectural design, collaboration has become an important challenge. The specialization of skills increase, work teams are more and more extensive and the ... [more ▼]

In the areas of design, especially in architectural design, collaboration has become an important challenge. The specialization of skills increase, work teams are more and more extensive and the geographic distance between them increases too. The economic and ecological stakes related to remote collaboration are an evidence. This context involves the need to support most efficiently possible remote working meetings. We present the Distributed Collaborative Digital Studio (DSDC), a tool designed to recreate, in distant situations, the context of copresence meetings. This shared environment is created in the “invisible computer” approach. The idea is that the tool should disappear from user’s consciousness. Indeed, creative design activities require some fluidity in their process. Therefore, any involuntary interruption created by the system can potentially brake creativity. In this perspective, we investigate specifically the “invisibility” of our environment. To do this, we propose a framework for the operationalization of the concept and a methodology to test the system invisibility. This methodology was applied through a case study consisting of a corpus of 12 hours of remote collaborative design sessions with the DSDC. We highlight the learning effects while using our system, conclude on its effectiveness and discuss our methodology. [less ▲]

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See detailDe la quérulence à la toute puissance, quelques réflexions sur la prise en charge des victimes
Garcet, Serge ULg

Conference given outside the academic context (2012)

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See detailOn the human pose recovery based on a single view
Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in International conference on pattern recognition applications and methods (ICPRAM) (2012, February)

Estimating the pose of the observed person is crucial for a large variety of applications including home entertainment, man-machine interaction, video surveillance, etc. Often, only a single side view is ... [more ▼]

Estimating the pose of the observed person is crucial for a large variety of applications including home entertainment, man-machine interaction, video surveillance, etc. Often, only a single side view is available, but authors claim that it is possible to derive the pose despite that humans evolve in a 3D environment. In addition, to decrease the sensitivity to color and texture, it is preferable to rely only on the silhouette to recover the pose. Under these conditions, we show that there is an intrinsic limitation: at least two poses correspond to the observed silhouette. We discuss this intrinsic limitation in details in this short paper. To our knowledge, this issue has been overlooked by authors in the past. We observe that this limitation has an impact on the way previous reported results should be interpreted, and it has clearly to be taken into account for designing new methods. [less ▲]

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See detailPOST-COMBUSTION CO2 CAPTURE: Global Process Simulation and Solvent Degradation
Léonard, Grégoire ULg; Lepaumier, Hélène; Blandina, Fabrice et al

Poster (2012, February)

One of the biggest upcoming challenges concerning both environmental and energy systems engineering is the control and limitation of greenhouse gas emissions due to human activity. Fossil fuels-fired ... [more ▼]

One of the biggest upcoming challenges concerning both environmental and energy systems engineering is the control and limitation of greenhouse gas emissions due to human activity. Fossil fuels-fired power plants are in this context one of the main contributors due to the large amounts of CO2 emitted. Different technologies have been developed for capturing CO2 from such power plants. This work focuses on post-combustion CO2 capture by reactive absorption into amine solvents like monoethanolamine (MEA). The main drawback of this technology is actually the high energy requirement of the process, especially for solvent regeneration. It is then highly interesting to model the capture process so that optimal operating conditions could be approached by simulation thus reducing the number of expensive experimental tests. Thanks to the simulation, it has been possible to identify the most influent process variables and to optimize their value. It was also possible to study the impact of process modifications on the global capture efficiency. The improvements studied allowed for a reduction by up to 14% of the process exergy consumption. Another major drawback of the post-combustion CO2 capture is solvent degradation, which can be due to thermal as well as oxidative mechanisms. Degradation affects the CO2 capture process since it may cause corrosion, foaming and fouling, possibly inducing a decrease of the solvent efficiency and high additional operating costs due to solvent replacement. In order to study degradation of conventional amine solvents as well as degradation of novel solvents, a degradation test rig has been built at the University of Liège in collaboration with the company Laborelec, member of the GDF SUEZ group. First results show that degradation obtained on this lab installation can be compared to degradation results observed on CO2 capture pilot installation. The final objective of this thesis is to make a link between degradation and simulation. Experimental data obtained on the degradation test rig will be implemented into the existing simulation model so that optimal operating conditions considering both process energy efficiency and solvent degradation can be determined. [less ▲]

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See detailFrançois Jacqmin, entre l'ascèse et la tempête
Purnelle, Gérald ULg

Article for general public (2012)

François Jacqmin compte parmi les quelques deux ou trois plus grands poètes de Belgique. Toute l’écriture de celui qui a dit « la poésie sera consolatrice, ou rien » est une lutte contre les limites ou ... [more ▼]

François Jacqmin compte parmi les quelques deux ou trois plus grands poètes de Belgique. Toute l’écriture de celui qui a dit « la poésie sera consolatrice, ou rien » est une lutte contre les limites ou les illusions de la pensée et de la parole, une tentative de dépasser l’impuissance de la poésie à conserver trace de l’émerveillement de l’homme devant la nature. Réel et langage, désir et nihilisme sont les pôles d’une œuvre capitale. [less ▲]

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See detailEvaluation of the cytotoxicity of organic dust components on thp1 monocytes-derived-macrophages using high content analysis
Ramery, Eve ULg; O'Brien, Peter James

in Environmental Toxicology (2012)

Organic dust contains pathogen-associated molecular patterns (PAMPs) which can induce significant airway diseases following chronic exposure. Mononuclear phagocytes are key protecting cells of the ... [more ▼]

Organic dust contains pathogen-associated molecular patterns (PAMPs) which can induce significant airway diseases following chronic exposure. Mononuclear phagocytes are key protecting cells of the respiratory tract. Several studies have investigated the effects of PAMPs and mainly endotoxins, on cytokine production. However the sub-lethal cytotoxicity of organic dust components on macrophages has not been tested yet. The novel technology of high content analysis (HCA) is already used to assess subclinical drug-induced toxicity. It combines the capabilities of flow cytometry, intracellular fluorescence probes, and image analysis and enables rapid multiple analyses in large numbers of samples. In the present study, HCA was used to investigate the cytotoxicity of the 3 major PAMPs contained in organic dust, ie. endotoxin (LPS), peptidoglycan (PGN) and β-glucans (zymosan) on THP-1 monocyte-derived macrophages. LPS was used at concentrations of 0.005, 0.01, 0.02, 0.05, 0.1 and 1 μg/ml; PGN and zymosan were used at concentrations of 1, 5, 10, 50, 100 and 500 μg/ml. Cells were exposed to PAMPs for 24 h. In addition, the oxidative burst and the phagocytic capabilities of the cells were tested. An overlap between PGN intrinsic fluorescence and red/far-red fluorescent dyes occurred, rendering the evaluation of some parameters impossible for PGN. LPS induced sub-lethal cytotoxicity at the lowest dose (from 50 ng/ml). However, the greatest cytotoxic changes occurred with zymosan. In addition, zymosan, but not LPS, induced phagosome maturation and oxidative burst. Given the fact that β-glucans can be up to 100-fold more concentrated in organic dust than LPS, these results suggest that β-glucans could play a major role in macrophage impairment following heavy dust exposure and will merit further investigation in the near future. [less ▲]

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See detailCurrent Developments of Alloyed Steels for Hot Strip Roughing Mills : Characterization of High-Chromium Steel and Semi-High Speed Steel
Lecomte-Beckers, Jacqueline ULg; Sinnaeve, Mario; Tchuindjang, Jérôme Tchoufack ULg

in Iron and Steel Technology (2012)

Two alloys grades for work rolls used in the roughing stand of Hot Strip Mill - high chromium steel (HCS) and semi-high-speed steel (semi-HSS), In this paper, the new semi-high-speed steel grade is studied

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