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See detailLa légation des Pays-Bas en cour de Rome au temps de l’agent Laurent du Blioul (1573-1598): Une légation au cœur des réseaux de la monarchie de Philippe II
Regibeau, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (2016, August)

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See detailCollaborative Care regarding major depressed patients: A review of guidelines and current practices
Van den Broeck, Kris; Remmen, Roy; Vanmeerbeek, Marc ULg et al

in Journal of Affective Disorders (2016), 200

Major Depressive Disorder (MDD) is a severe and common mental disorder. A growing body of evidence suggests that stepped and/or collaborative care treatment models have several advantages for severely ... [more ▼]

Major Depressive Disorder (MDD) is a severe and common mental disorder. A growing body of evidence suggests that stepped and/or collaborative care treatment models have several advantages for severely depressed patients and caretakers. However, despite the availability of these treatment strategies and guidance initiatives, many depressive patients are solely treated by the general practitioner (GP), and collaborative care is not common. In this paper, we review a selected set of international guidelines to inventory the best strategies for GPs and secondary mental health care providers to collaborate when treating depressed patients. Additionally, we systematically searched the literature, listing potential ways of cooperation, and potentially supporting tools. We conclude that the prevailing guidelines only include few and rather vague directions regarding the cooperation between GPs and specialised mental health practitioners. Inspiring recent studies, however, suggest that relatively little efforts may result in effective collaborative care and a broader implementation of the guidelines in general. [less ▲]

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See detailPhonological acquisition in CLIL- and non-CLIL education
Rasier, Laurent ULg

Conference (2016, August)

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See detailEnhancing Cover Song Identification with Hierarchical Rank Aggregation
Osmalsky, Julien ULg; Van Droogenbroeck, Marc ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 17th International for Music Information Retrieval Conference (2016, August)

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features ... [more ▼]

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features, recent work tends to demonstrate that combining similarity estimators based on multiple audio features increases the performance. We improve this approach by using a hierarchical rank aggregation method for combining estimators based on different features. More precisely, we first aggregate estimators based on global features such as the tempo, the duration, the loudness, the beats, and the average chroma vectors. Then, we aggregate the resulting composite estimator with four popular state-of-the-art methods based on chromas as well as timbre sequences. We further introduce a refinement step for the rank aggregation called “local Kemenization” and quantify its benefit for cover song identification. The performance of our method is evaluated on the Second Hand Song dataset. Our experiments show an significant improvement of the performance, up to an increase of more than 200 % of the number of queries identified in the Top-1, compared to previous results. [less ▲]

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See detailEffects of aging on task- and stimulus-related cerebral attention networks
Kurth, Sophie ULg; Majerus, Steve ULg; Bastin, Christine ULg et al

in Neurobiology of Aging (2016), 44

Interactions between a dorsal attention (DAN) and a ventral attention cerebral network (VAN) have been reported in young participants during attention or short term memory (STM) tasks. Since it remains an ... [more ▼]

Interactions between a dorsal attention (DAN) and a ventral attention cerebral network (VAN) have been reported in young participants during attention or short term memory (STM) tasks. Since it remains an under-investigated question, age effects on DAN and VAN activity and their functional balance were explored during performance of a STM task. Older and young groups showed similar behavioral patterns of results. At the cerebral level, DAN activation increased as a function of increasing STM load in both groups, suggesting preserved activity in DAN during healthy aging. Age-related over-recruitment in regions of the DAN in the higher task load raised the question of compensation attempt versus less efficient use of neural resources in older adults. Lesser decrease of VAN activation with increasing load and decreased stimulus-driven activation in the VAN, especially in the higher load, in older participants suggested age-related reduced response in the VAN. However, functional connectivity measures showed that VAN was still functionally connected to the DAN in older participants. [less ▲]

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See detailHydrocarbon biostimulation and bioaugmentation in organic carbon and clay-rich soils
Masy, Thibaut ULg; Demanèche, Sandrine; Tromme, Olivier et al

in Soil Biology & Biochemistry (2016), 99

Hydrocarbon-contaminated organic carbon-rich clayey soils are challenging for bioremediation stakeholders since the pollutant is heterogeneously distributed and poorly bioavailable due to its strong ... [more ▼]

Hydrocarbon-contaminated organic carbon-rich clayey soils are challenging for bioremediation stakeholders since the pollutant is heterogeneously distributed and poorly bioavailable due to its strong adsorption on clay and organic particles. In addition, biodegradation rates are restricted by limited diffusion of oxygen and nutrients to hydrocarbon-degrading aerobes. This study assessed the benefits of bioaugmentation with the strain Rhodococcus erythropolis T902.1 versus those from biostimulation and anaerobic natural attenuation in terms of hydrocarbon (HC) degradation efficiency and changes in the bacterial community structure in a diesel-polluted clay-rich soil. Three soil samples with a similar total organic content but with a different HC concentration (0.2, 1.0 and 6.5 g/kg) were compared in a microcosm experiment. Despite a limitation in oxygen transfer, R. erythropolis T902.1 enhanced a greater HC degradation compared to the biostimulation treatment. However, this advantage decreased with time as the proportion of Rhodococci declined from 25% initially to 1% of the global community after 80 days of treatment. Similarly, the alkB gene proportion in bioaugmented soils decreased to levels close to those of biostimulated soils. Consequently, further engineering was suggested to improve the resilience of the inoculum to ensure its long-term presence and activity in such polluted environments. [less ▲]

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See detailEVALUATION OF FISH EXPOSURE TO POP-LIKE (ORGANOTIN) COMPOUNDS IN SEPETIBA BAY (RIO DE JANEIRO STATE, BRAZIL) THROUGH HEPATIC TOTAL TIN CONCENTRATIONS
Paiva, TC; Schilithz, PF; Bisi, TL et al

in Organohalogen Compounds (2016, August)

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See detailStable biofilms of Rhodococcus erythropolis T902.1 in draining pavement structures for runoff water decontamination
Masy, Thibaut ULg; Bertrand, Christelle ULg; Paul-Marie, Xavier et al

in International Biodeterioration & Biodegradation (2016), 112

Permeable Pavement Systems (PPS) are sustainable devices designed to collect, store and treat urban stormwater before its release into the ground. However, this system must sufficiently retain pollutants ... [more ▼]

Permeable Pavement Systems (PPS) are sustainable devices designed to collect, store and treat urban stormwater before its release into the ground. However, this system must sufficiently retain pollutants brought by water runoff in order to comply with the current legislation. This study aims at evaluating the implementation in PPS of a hydrocarbonoclastic bacterium, Rhodococcus erythropolis T902.1, in terms of resilience and improvement of the degrading capacity. First results revealed that this strain could durably colonize the different gravels used in the construction of PPS. A 15-month experience in a real parking area showed that this biofilm remained viable without any replenishment of nutrients or bacteria. During accelerated pollution tests at a pilot scale, the structure bioaugmented with pre-coated biofilms was more efficient than a non-inoculated structure to limit hydrocarbon leaching below 50 μg L−1 and to degrade hydrocarbons adsorbed to the gravels. Over the long term, this innovative assembly should maintain the degrading capacity of PPS and ensure an effective treatment of stormwater before its infiltration into the soil. [less ▲]

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See detailFeasibility study of burning neat jatropha oil into a vaporizing burner for household applications.
Sartor, Kevin ULg; Makaire, Danielle; Fontaine, Jean-Marie et al

in Proceedings (2016, August)

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See detailEffect of Mechanical Loading on Peri-Implant Bone Remodeling Measured with Time-Lapsed Imaging and Finite Element Analysis
Li, Zihui; Betts, Duncan; Kuhn, Gisela et al

Conference (2016, July 28)

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See detailPolymeric Nanoparticles as siRNA Drug Delivery System for Cancer Therapy: The Long Road to Therapeutic Efficiency
Frère, Antoine ULg; Evrard, Brigitte ULg; Mottet, Denis ULg et al

in Holban, Alina Maria; Grumezescu, Alexandru (Eds.) Nanoarchitectonics for Smart Delivery and Drug Targeting (2016)

Polyplexes are nanoparticles composed of small-interfering RNA (siRNA) and natural or synthetic polymers. To meet the challenge of gene therapy and deliver siRNA into the cytoplasm of target cells ... [more ▼]

Polyplexes are nanoparticles composed of small-interfering RNA (siRNA) and natural or synthetic polymers. To meet the challenge of gene therapy and deliver siRNA into the cytoplasm of target cells, several barriers must be overcome. In this chapter, the main steps, from the formulation of polyplexes to the efficient release of the siRNA into the cytoplasm of cancer cells, are described, taking into account the different strategies used to overcome the obstacles linked to the formulation of this type of nanovector. To allow a parenteral administration of the nanocolloids, the polyplex production methods should result in identical, stable, and reproducible nanostructures. Charge interactions occur between the anionic siRNA and the cationic/amphiphilic polymer. Once in the blood circulation, polyplexes must keep their physical stability. The positively charged surface can cause aggregation of the nanoparticles with plasma proteins, as well as complement activation and recognition by the mononuclear phagocytic system, with a consequent reduction of their pharmacological activity. Polyethylene glycol (PEG) can be added on the surface of the nanovectors to confer “the stealth” properties and increase plasma half-life. Then, particles have to preferentially accumulate in the tumor tissue following an active or passive targeting. Endocytosis process enables the polyplex cellular uptake, but some strategies like “the proton sponge effect” have to be used to allow the escape of the nanovectors from the cellular endosomes. Once released into the cytoplasm, polymer and siRNA must dissociate for an effective degradation of the targeted mRNA, leading finally to a decrease of the corresponding protein. [less ▲]

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See detailLa logique de l'espace dans les stemmas de Lucien Tesnière
Mazziotta, Nicolas ULg

Conference (2016, July 19)

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See detailServitude et grandeur pédagogiques. Les nouvelles circonstances et exigences du métier de professeur de français langue étrangère.
Defays, Jean-Marc ULg

Scientific conference (2016, July 19)

Les circonstances ne sont guère favorables aux professeurs de français, ni aux professeurs de langues et de cultures d’une manière générale, qui traversent des temps aussi difficiles que cruciaux dans ... [more ▼]

Les circonstances ne sont guère favorables aux professeurs de français, ni aux professeurs de langues et de cultures d’une manière générale, qui traversent des temps aussi difficiles que cruciaux dans chacun de leur pays, chacune de leur institution et chacune de leur classe. Face à l’uniformisation linguistique et culturelle, aux restrictions budgétaires, à l’instrumentalisation de l’enseignement, c’est presque devenu un sacerdoce que de promouvoir la diversité non intéressée, les échanges non commerciaux, les valeurs non marchandes, bref l’humanisme. En ce qui concerne la langue française, partant les cultures francophones, le défi n’est pas seulement – par leur enseignement – de les maintenir vivantes et attrayantes dans des pays où elles sont étrangères ou secondes, mais aussi résistantes et entreprenantes dans les pays francophones où leur échappent des domaines d’activités aussi fondamentaux que l’économie, la diplomatie, la science, voire l’enseignement supérieur. Un défi encore plus important est de replacer la culture, les cultures, que la langue, que les langues, véhiculent, associent, enrichissent, au centre du vivre-ensemble sous peine de voir s’aggraver les replis et les conflits identitaires. C’est précisément en refusant de servir une conception étroite et stérile de la mondialisation qu’acquièrent leur grandeur les projets des professeurs de français dans le monde, de leurs associations, de la FIPF. [less ▲]

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See detailShaping (im)mobility in border camps: a case study of the transformation of Calais camps and its actors
Da Silva, Amanda Carolina ULg

Conference (2016, July 13)

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the ... [more ▼]

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the implementation of a semi-permanent exclusion system based on the refugee crisis. I observe this issue as a result of a securitization process. The securitization apparatus (speech acts and policies), produced the immobility of a group. In the other hand actors will emerge to produce mobility. When a situation is defined as a crisis, atypical actions can be employed to protect the «political community». I started from the assumption that dialectic relation between securitization and camps actors had a high impact on the projects of refugees, and so long in their mobility. This is a question of integration policies at the local level. I aim to highlight the local level relevance, where the integration is primarily implemented, and therefore local and regional context should matter as much as the national model for integration (Martiniello, 2013). In Calais, due to the lack of immigrants policies, civilians associations started to react and build informal camps, but due to recent "crisis" the Stat concentrated all refugees in a single camp, 6 kilometers from the city center, called bidonville. [less ▲]

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See detailOn the use of ROC curves in DIF simulation studies
Magis, David ULg; Tuerlinckx, Francis

Conference (2016, July 12)

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF ... [more ▼]

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF items relies on statistics based on pre-defined significance level or on pre-established cutoff values. DIF methods based on conceptually different approaches may therefore become incomparable in terms of summary DIF statistics such as false alarm rate or hit rate. The purpose of this talk is to overcome this analytic issue by introducing receiver operating characteristic (ROC) curves in this context. ROC curves allow for global comparison of methods’ performances by computing pairs of (false alarm, hit) rates and representing them on a common scatter plot. Several summary ROC statistics can be considered for further analysis. The application of the ROC curve methodology, together with its limitation and possible extensions, is illustrated by a simple simulation study that compares three score-based DIF methods (Mantel-Haenszel, standardization and Delta plot). [less ▲]

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See detailExamine the effects of two adjustments to the lz statistic
Riley, Barth; Magis, David ULg

Conference (2016, July 12)

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two ... [more ▼]

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two adjustments to the standardized log-likelihood statistic (lz): (1) correction of the negatively skewed distribution of lz (Snijders, 2001), and (2) improving the sensitivity of the statistic by employing more accurate estimates of item response probability using symmetric functions (Dimitrov and Smith, 2006). Data were simulated using three test lengths (10, 20, 30 items). Data containing misfitting response patterns were simulated using three aberrant response patterns (cheating, guessing, and inattentiveness), and three levels of aberrance (i.e., proportion of item responses affected by misfit; 10%, 30% and 50%). Data containing no simulated misfitting response patterns were also generated for each test length. Non-misfitting responses were generated using the dichotomous Rasch measurement model. For each combination of independent variables, a dataset was generated consisting of 5,000 simulees. Four fit statistics were compared: lz, lz* (Snijders adjustment), lzSYM (Dimitrov and Smith adjustment), and lzSYM* (both adjustments). Mean Type I error rates were ≤ 0.1 across all conditions. The lz* statistic produced the best control of Type I error, which was often below the nominal Type I error rate, whereas the empirical Type I error rate for the unadjusted lz statistic most closely approximated the nominal rate. In contrast, lzSYM and lzSYM* yielded empirical Type I error rates larger than the nominal rate, with the discrepancy being particularly pronounced as the length of the test decreased. As might be expected, power to detect misfitting response patterns increased with test length and with the percentage of misfitting response patterns in the sample. Both lzSYM and lzSYM* evidenced improved power in detecting misfitting response patterns compared to lz and lz*, particularly for guessing response patterns and/or on shorter (i.e., 10 item) tests. [less ▲]

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See detailOpen source programming: a new hope for psychometric research
Magis, David ULg

Conference (2016, July 12)

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore ... [more ▼]

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore require accurate, fast and stable implementation. To this regards, open source programming (such as in the R language) is a promising approach allowing for flexible implementation, data generation, replication of studies, and worldwide dissemination. The purpose of this talk is to illustrate how psychometrics and open source programming (with special emphasis on the R language) can interact and contribute to each other, by means of some selected examples. Several topics will be illustrated, among others: why open source programming is (to my opinion) as important as psychometric research; why we need for stable and complete implementation of psychometric and statistical routines for research purposes (for e.g., CAT); how accurate implementation of IRT routines can lead to unexpected theoretical results; why (and how) open source software can be valued as research output. Most examples will arise from the CAT framework and the R package catR for simulating CAT patterns. [less ▲]

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See detailA Novel Methodology for Hybrid Fire Testing
Sauca, Ana ULg; Gernay, Thomas ULg; Robert, Fabienne et al

in Proceedings of the 6th European Conference on Structural Control (2016, July 11)

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is ... [more ▼]

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is calculated separately, here by means of a predetermined matrix. Equilibrium and compatibility at the interface between the tested “physical substructure” and the “numerical substructure” is maintained throughout the test using a dedicated algorithm. The procedures developed so far are sensitive to the stiffness ratio between the physical and the numerical substructure and therefore they can be applied only in some cases. In fire field, the stiffness of the heated physical substructure may change dramatically and the resulting change in stiffness ratio can lead to instability during the test. To overcome this drawback, a methodology independent of the stiffness ratio has been developed, inspired from the Finite Element Tearing and Interconnecting (FETI) method, which has been originally developed for substructuring in numerical analyses. The novel methodology has been successfully applied to a hybrid fire test in a purely numerical environment, i.e. the physical substructure was also modelled numerically. It is shown that stability does not depend on the stiffness ratio and that equilibrium and compatibility can be consistently maintained at the interface during the fire. Finally, the ongoing experimental program aimed at employing and experimentally validating this methodology is described. [less ▲]

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See detailFiniteness of the weighted likelihood estimator and applications to CAT
Magis, David ULg

Scientific conference (2016, July 07)

The purpose of this talk is to present some recent research on the weighted likelihood estimator (WLE) of ability in item response theory (IRT). This estimator is quite commonly used as an alternative to ... [more ▼]

The purpose of this talk is to present some recent research on the weighted likelihood estimator (WLE) of ability in item response theory (IRT). This estimator is quite commonly used as an alternative to usual maximum likelihood and Bayesian estimators. However, the uestion of providing finite ability estimates was left unsolved and led to some controversy. Recently, Magis and Verhelst (in press) established that the WLE always returns finite values, independently of the IRT model, the number of items, and the item responses. This general result will be briefly outlined. The finiteness of the WLE has straightforward impact within the field of computerized adaptive testing (CAT). One technical and crucial issue in CAT is to accurately estimate the latent ability at the early stages of the adaptive process, when only a few items are available. Currently heuristic adjustments are adviced to avoid infinite estimates with only a few item responses. In this talk it will be highlighted how the use of the WLE throughout the CAT can be a promising and performant approach to solve this issue. [less ▲]

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