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Peer Reviewed
See detailL'évaluation du profil psychosocial de demandeurs d'emploi, une population peu familiarisée à la technologie informatique
Houssemand, Claude UL; Meyers, Raymond UL; Martin, Romain UL

in Blais, Jean-Guy (Ed.) Évaluation des apprentissages et technologies de l’information et de la communication: Enjeux, applications et modèles de mesure (2009)

L’utilisation de plus en plus répandue du testing assisté par ordinateur (TAO) auprès de différentes populations ne doit pas faire oublier un certain nombre de biais potentiels pouvant créer des ... [more ▼]

L’utilisation de plus en plus répandue du testing assisté par ordinateur (TAO) auprès de différentes populations ne doit pas faire oublier un certain nombre de biais potentiels pouvant créer des différences artificielles entre les sujets. Dès les premières expérimentations du TAO, la familiarité avec l’outil informatique et l’anxiété envers l’ordinateur ont été mises en avant comme de potentielles sources de variation dans les performances enregistrées. Même si maintenant, avec la démocratisation de cet outil, ces biais peuvent paraître moins marqués, il reste des populations ou/et des situations pour lesquelles leur impact reste important. Dans le cadre des Services Publics de l’Emploi, la situation de chômage des personnes tout-venant peut paraître difficilement conciliable avec l’utilisation de l’ordinateur à des fins d’évaluation. Pourtant, même avec des personnes très peu familiarisées avec cet outil, voire le découvrant, des mesures de différentes dimensions de personnalité, d’attitude et d’intelligence ont été réalisées sans rencontrer de difficultés majeures ou de refus. Il est évident qu’un certain nombre d’adaptations des outils et du matériel est nécessaire, mais il semble que l’utilisation du TAO puisse être généralisée. Le présent papier montrera les aménagements qui ont été nécessaires pour rendre possible ces évaluations, des résultats comparés entre évaluations par le TAO sur ces populations et celles de populations dites «non-spécifiques» et les intérêts à généraliser ce type de prises d’informations. [less ▲]

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Peer Reviewed
See detailEvaluation externe d’un lycée-pilote au Luxembourg – utilisation de questionnaires en miroir pour comparer l’opinion des différents acteurs de la communauté scolaire.
Villanyi, Denise UL; Mancuso, Giovanna UL; Poncelet, Débora UL et al

in Actes du 25ème colloque de l’ADMEE-Europe Fribourg 2013 : Evaluation et autoévaluation, quels espaces de formation (2013)

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See detailEvaluation kognitiver Fähigkeiten im luxemburgischen Schulsystem
Muller, Claire UL; Reichel, Yanica UL; Wollschläger, Rachel UL et al

Report (2018)

Das Erlernen von Fremdsprachen hat sich über die Jahre hinweg als zentral für die soziale und kulturelle Entwicklung der Schüler Luxemburgs erwiesen. Die sprachlichen Kurrikula sind entsprechend komplex ... [more ▼]

Das Erlernen von Fremdsprachen hat sich über die Jahre hinweg als zentral für die soziale und kulturelle Entwicklung der Schüler Luxemburgs erwiesen. Die sprachlichen Kurrikula sind entsprechend komplex ausgelegt. Nicht alle Schüler sind dieser Herausforderung gewachsen. Daten aus dem luxemburgischen Schulmonitoring (Épreuves standardisées) zeigen, dass vor allem Grundschüler, die zuhause keine der Landessprachen nutzen, Probleme haben eine richtige Erstsprache zu entwickeln. In diesem Fall ist es nicht weiter verwunderlich, wenn auch andere Kompetenzen nur schleppend ausgebildet werden. Leider wird die Sprachenvielfalt – so sinnvoll und nützlich sie für den Einen auch ist – für so Manche zum Hindernis. Das System produziert unweigerlich Schüler, deren akademische Leistungen unter ihrem Potential bleiben: die sogenannten „Underachiever“. Bevor wir uns allerdings überlegen können wie diesem Problem zu begegnen ist, muss kognitives Potential überhaupt evaluiert werden können. Bislang existieren jedoch keine Tests, die an die Luxemburgische Schülerpopulation angepasst sind. Um diesen Mangel zu beheben, wurde am LUCET der Test of Cognitive Potential (TCP) entwickelt. Der TCP ermöglicht es, kognitive Kompetenzen weitestgehend sprach- und kulturfrei zu erfassen, womit er den Bedürfnissen des luxemburgischen Schulsystems optimal entspricht. Im Verlauf des Kapitels wird der TCP kurz vorgestellt, um folgend erste Beobachtungen hinsichtlich der Problematik des „Underachievements“ anzustellen. Anschließend wird aufgezeigt, wie universal der Nutzen einer systematischen Evaluation von kognitiven Fähigkeiten im schulischen Kontext ist: von der Diagnose spezifischer Lernschwierigkeiten auf Individualniveau bis hin zur Beurteilung der Passung von Lernprogrammen und Fördermaßnahmen auf Systemniveau. [less ▲]

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Peer Reviewed
See detailAn Evaluation Model for Selecting Cloud Services from Commercially Available Cloud Providers
Wagle, Shyam Sharan UL; Guzek, Mateusz UL; Bouvry, Pascal UL et al

in 2015 IEEE 7th International Conference on Cloud Computing Technology and Science (CloudCom) (2015, December)

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See detailEvaluation of a CFD-Simulation approach for modelling CO2 evaporation in microchannels in Ansys Fluent using a mixture-model
Dvorak, Tom; Mazitzis, Nikolaos; Cousin, René et al

Poster (2016)

Microchannels shall be used for evaporation of CO2 in a heat-pump cycle of a hybrid PV-module with direct heat recovery (PVT-direct). In order to predict the required tube length and the expected pressure ... [more ▼]

Microchannels shall be used for evaporation of CO2 in a heat-pump cycle of a hybrid PV-module with direct heat recovery (PVT-direct). In order to predict the required tube length and the expected pressure losses of the microchannel evaporator, a CFD simulation model was implemented and evaluated. The simulation shall finally help finding the adequate size of the evaporator and optimize its geometry. For the simulation the software “Fluent” was chosen using the two phase mixture-model including the Lee-model for evaporation. As the tubes in the microchannel system represent an axis-symmetric setup, a 2D-geometry is sufficiently suitable for the model and its mesh. After an initial testing of the mixture model, it could be seen that the conservation of mass and energy were not correctly calculated with the advised standard set of parameters, neither the phase change mechanism with its characteristic latent heat. In order to get reasonable results with the mixture model, the input parameters of the evaporation rate and the bubble diameter were systematically varied and validated by manual calculation based on experimental data published in the standard literature. To further improve the numerical quality and stability of the simulation, solver parameters were changed. The adjustment of discretization schemes and the under-relaxation factors were most successful. The effect of different boundary conditions for solar radiation and convective heat on the relevant evaporator surface was also investigated. The test simulations showed that the mixture model is appropriate for a low vapor volume fraction but maybe reaches its limits at higher vapor volume fractions as the flow regime changes. It needs more investigation to prove if drop-evaporation will be sufficiently represented by the chosen model. Consequently, the modelling approach must be optimized and validated for the relevant volume vapor fraction of up to 95 Vol %. This will be the task for the future. And also completely different model approaches have to be considered. [less ▲]

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See detailEvaluation of a regional real-time precise positioning system based on GPS/BeiDou observations in Australia
Ding, Wenwu UL; Tan, Bingfeng; Chen, Yongchang et al

in Advances in Space Research (2018)

The performance of real-time (RT) precise positioning can be improved by utilizing observations from multiple Global Navigation Satellite Systems (GNSS) instead of one particular system. Since the end of ... [more ▼]

The performance of real-time (RT) precise positioning can be improved by utilizing observations from multiple Global Navigation Satellite Systems (GNSS) instead of one particular system. Since the end of 2012, BeiDou, independently established by China, began to provide operational services for users in the Asia-Pacific regions. In this study, an regional RT precise positioning system in Australia is developed to evaluate the performance of GPS/BeiDou observations in providing high precision positioning services for users. Fixing three hourly updated satellite orbits, RT correction messages are generated and broadcasted by processing RT observation/navigation data streams from AUSCORS at the server side. At the user side, RT PPP is realized by processing RT data streams and the RT correction messages received. RT clock offsets, for which the accuracy reached 0.07 and 0.25 ns for GPS and BeiDou, respectively, can be determined. Based on these corrections, an accuracy of 12.2, 30.0 and 45.6 cm in the North, East and Up directions was achieved for the BeiDou-only solution after 30 minutes while the GPS-only solution reached 5.1, 15.3 and 15.5 cm for the same components at the same time. A further improvement of 43.7, 36.9 and 45.0 percent in the three directions, respectively, was achieved for the combined GPS/BeiDou solution. After the initialization process, the North, East and Up positioning accuracies were 5.2, 8.1 and 17.8 cm, respectively, for the BeiDou-only solution, while 1.5, 3.0, and 4.7 cm for the GPS-only solution. However, we only noticed a 20.9% improvement in the East direction was obtained for the GPS/BeiDou solution, while no improvements in the other directions were detected. It is expected that such improvements may become bigger with the increasing accuracy of the BeiDou-only solution. [less ▲]

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Peer Reviewed
See detailEvaluation of an anatomically augmented Statistical Shape Model of the scapula: Clinical validation and reliability of landmark selection. Submited to
Borotikar, Bhushan; Ghorbel, Enjie UL; Lempereur, Mathieu et al

in Computer Methods in Biomechanics and Biomedical Engineering. Imaging and Visualization (2015)

Detailed reference viewed: 34 (1 UL)
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See detailEvaluation of an antagonistic model of self-controlled skill learning
Bund, Andreas UL; Ferwagner, Dirk

Poster (2006, July)

Detailed reference viewed: 19 (0 UL)
Peer Reviewed
See detailThe evaluation of an educational system toward its monitoring and piloting
Houssemand, Claude UL; Wanlin, P

Poster (2007, September)

Detailed reference viewed: 18 (1 UL)
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See detailEvaluation of basic motor competencies in primary school children: Development of a test instrument
Scheuer, Claude; Bund, Andreas UL; Herrmann, Christian

in Revista Espanola de Educación Física y Deporte (2015, July), 410 (Supl.)(3), 486

Detailed reference viewed: 55 (4 UL)
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Peer Reviewed
See detailEvaluation of Cell Line Suitability for Disease Specific Perturbation Experiments.
Biryukov, Maria UL; Antony, Paul UL; Krishna, Abhimanyu UL et al

in Lausen, Berthold; Krolak-Schwerdt, Sabine; Böhmer, Matthias (Eds.) Data Science, Learning by Latent Structures, and Knowledge Discovery (2015, February 20)

Cell lines are widely used in translational biomedical research to study the genetic basis of diseases. A major approach for experimental disease modeling are genetic perturbation experiments that aim to ... [more ▼]

Cell lines are widely used in translational biomedical research to study the genetic basis of diseases. A major approach for experimental disease modeling are genetic perturbation experiments that aim to trigger selected cellular disease states. In this type of experiments it is crucial to ensure that the targeted disease- related genes and pathways are intact in the used cell line. In this work we are developing a framework which integrates genetic sequence information and disease- specific network analysis for evaluating disease-specific cell line suitability. [less ▲]

Detailed reference viewed: 171 (22 UL)
See detailEvaluation of cognitive ability in heterogeneous student populations: Development of the Test of Cognitive Potential
Muller, Claire UL

Doctoral thesis (2016)

Evaluation of cognitive potential of individuals with diverse backgrounds often presents a challenge. Individuals’ imperfect mastery of the language of instruction in particular presents a major threat to ... [more ▼]

Evaluation of cognitive potential of individuals with diverse backgrounds often presents a challenge. Individuals’ imperfect mastery of the language of instruction in particular presents a major threat to validity of results and prohibits comparison to performance with better language skills. Eliminating language from test instruction may be a solution to this problem. The present thesis presents the development and validation of the innovative Test of Cognitive Potential (TCP), a language-free, tablet-based group-assessment tool designed to measure fluid intelligence within children in grade 4 (regular age between 9 and 10). Using dynamic visual instruction videos, task requirements are presented visually, without adding any verbal clarification. In order to sample a wide array of cognitive processes on different contents (domain-general, quantitative and semantic-syntactic reasoning as well as visual processing), the TCP includes a variety of subtests. Using confirmatory factor analysis, the overall structure of the test is evaluated within student samples from Luxembourg, Germany and Brazil. In a 2x2 design, measurement invariance of a latent TCP g-factor is further shown to largely hold across combinations of verbal vs. visual dynamic instruction and tablet-based vs. paper & pencil assessment. For the target TCP version (tablet and dynamic visual instruction), only one subtest is found to present increased residual variance and thus needs revision. Overall, a strong association of the TCP with criterion measures (educational achievement and a well-established test of cognitive ability) is found across samples. Measurement of a latent TCP factor could further be shown to be invariant across students with differential opportunity to learn. No strong evidence of biased measurement is found for students with different language backgrounds and socio-economic status. The Test of Cognitive Potential proofs to be a valid and reliable tool for the measurement of general cognitive ability. It will be particularly useful for the evaluation of children with limited understanding of the local language. Avoiding language bias, the TCP may contribute to the reduction of inequalities in educational opportunities that are produced by structural characteristics of many school systems. [less ▲]

Detailed reference viewed: 186 (29 UL)