References of "Unpublished conference"
     in
Bookmark and Share    
Peer Reviewed
See detailRecursive UE Localization for a Multi-RIS-Assisted Wireless System in an Obstacle-Dense Environment
Zhao, Sibo; Liu, Yuan UL; Wu, Linlong UL et al

Scientific Conference (in press)

Accurate user equipment (UE) localization in an obstacle-dense environment is quite challenging due to the insufficiency of line-of-sight (LoS) links. However, the reconfigurable intelligent surface (RIS ... [more ▼]

Accurate user equipment (UE) localization in an obstacle-dense environment is quite challenging due to the insufficiency of line-of-sight (LoS) links. However, the reconfigurable intelligent surface (RIS) has the potential for offering alternative RIS-assisted LoS links to refine the localization results. In this paper, a recursive localization scheme is proposed based on an iterative RIS selection strategy, with the help of prior knowledge of the propagation environment. And numerical results based on a geometry-based channel simulator in a typical composite urban environment exhibit the improvement of localization accuracy. [less ▲]

Detailed reference viewed: 49 (6 UL)
Full Text
Peer Reviewed
See detailProject DragLiner: Harnessing plasma Coulomb drag for satellite deorbiting to keep orbits clean
Genzer, Maria; Janhunen, Pekka; Haukka, Harri et al

Scientific Conference (in press)

Detailed reference viewed: 28 (5 UL)
Full Text
See detailThermodynamic integration via Replica Exchange Hamiltonian Monte Carlo for faster sampling and model comparison
Mingo Ndiwago, Damian UL; Nijzink, Remko; Ley, Christophe UL et al

Scientific Conference (2023, April 24)

Detailed reference viewed: 49 (3 UL)
Peer Reviewed
See detailIntérêt de la participation des parents dans un modèle de Réponse à l’Intervention (RàI) ou dans un Système de Soutien à Paliers Multiples (SSPM) : une récension des écrits
Poncelet, Débora UL; Tinnes, Mélanie UL

Scientific Conference (2023, April 03)

Avec la démocratisation de l’enseignement et la multiplication des profils d’apprenants, l’institution scolaire a rapidement été confrontée à la nécessité d’étudier comment les besoins des élèves sont ... [more ▼]

Avec la démocratisation de l’enseignement et la multiplication des profils d’apprenants, l’institution scolaire a rapidement été confrontée à la nécessité d’étudier comment les besoins des élèves sont pris en compte par le système et comment les pratiques éducatives lui sont adaptées. C’est dans ce contexte qu’au début des années 2000, le modèle de réponse à l’intervention (RàI) a vu le jour. Il se définit comme une approche visant l’identification des élèves en difficulté et la mise en place d’une intervention ciblée sur les besoins de l’apprenant (Desrochers & Guay, 2020). Au fil des années, ce modèle RàI s’est intensifié et élargi à de nombreux domaines d’apprentissage mais aussi à la gestion du comportement des élèves. Cet élargissement du champ d’action initial a amené à renommer l’appellation de l’approche en Système de Soutien à Paliers Multiples (SSPM). Si la qualité de l’enseignement en classe et le soutien additionnel apporté aux élèves en difficulté semblent constituer le socle des interventions mobilisées dans le cadre du modèle RàI ou de l’approche en SSPM, il semble que l’engagement parental et la collaboration famille-école pourraient constituer un apport intéressant. En tant que premiers agents de socialisation de l’enfant et compte tenu de l’influence importante des familles sur la réussite développementale et éducative des enfants, la promotion de l’engagement parental et du partenariat famille-école présente un grand intérêt. Or, peu d’études ont, à ce jour, associé la facette famille à un modèle SSPM. Depuis plus de vingt années, l’engagement parental et le partenariat avec les parents constituent une thématique de recherche dont l’intérêt ne cesse de croître. Des synthèses récentes (par exemple, Axford et al., 2019 ; Englund et al., 2004 ; Kim et al., 2020, Roy & Giraldo-García, 2018 ; Huat See & Gorard, 2015), soulignent à quel point les relations école-famille ainsi que l’engagement parental peuvent avoir une influence significative et positive à la fois sur les performances scolaires mais aussi sur des variables conatives. Toutes ces études semblent converger vers le constat que la participation des parents a une influence positive sur la scolarité des élèves. Or, comme le rappellent Castro et al. (2015), ces études souffrent d’un manque d’homogénéisation des concepts à l’étude ; ce qui fait de la participation des parents un phénomène multiforme et multidimensionnel. En outre, il semble que peu d’études incluent un incitant à mettre en place une stratégie parentale particulière de soutien au cursus scolaire de l’enfant (Lawson, 2015). Cependant, il semble que l’école comme les familles se demandent quelles sont les façons les plus efficaces de collaborer pour optimiser les effets de l’engagement parental (Jeynes, 2012). Il apparait que le plus souvent les démarches et les actions sont davantage centrées sur l’école (Kanouté, 2006) qui tendent à placer les familles dans des rôles éducatifs mineurs (participation aux réunions de parents, par exemple). Toutefois, Garbacz et al. (2008) soutiennent qu’une approche d’implication parentale basée sur le partenariat favoriserait le renforcement des compétences des familles comme du personnel scolaire en identifiant et en soutenant les ressources des deux acteurs. Selon les auteurs, cette approche serait efficace car elle repose sur le principe d’une participation active des familles depuis l’identification des besoins, l’établissement de l’intervention et l’acquisition de nouvelles compétences plutôt que sur une réception passive d’une intervention externe faites par des professionnels. Ajoutons encore avec Larivée (2012) que pour renforcer l’efficacité des programmes d’implication parentale, il est important de concevoir les interventions en se référant aux données probantes de la recherche scientifique. Nous nous demandons si, par conséquent, le fait de renforcer la participation des parents dans la scolarité de leur enfant, au sein du modèle SSPM, dans le cadre d’un véritable partenariat école-famille autour d’une compétence d’apprentissage particulière, pourrait renforcer l’influence positive de ce soutien parental sur le développement scolaire de l’enfant tant au niveau des apprentissages scolaires (numératie et littératie) que de ses compétences socio-émotionnelles. C’est donc à travers une récension des écrits que nous cherchons à mettre en évidence l’intérêt de la participation des parents à un modèle de RàI ou une approche basée sur un SSPM. Pour réaliser cette synthèse, nous avons procédé de la façon suivante. Nous avons mené une recension de textes sur la participation des parents, le RàI ou le SSPM. Pour ce faire, nous avons eu recours à la base de données Education Research Complete. Nous avons utilisé les mots-clefs suivants : participation parentale, engagement parental ou investissement parental, Réponse à l’Intervention (RàI), Système de Soutien à Paliers Multiples (SSPM), numératie, littératie ou compétences socio-émotionnelles, ainsi que leur traduction en anglais : Response to intervention, Multi-tiered system of support, parental involvement ou parent engagement ou parent participation, numeracy, litteracy or Social-Emotional Learning (SEL). Les critères utilisés pour sélectionner les articles sont les suivants : 1) l’article est issu d’une revue à comité de lecture ; 2) l’article est disponible en langue française ou anglaise ; 3) l’article utilise une méthodologie qualitative et/ou quantitative étudiant l’intérêt d’une participation des parents dans un modèle RàI ou dans une approche en SSPM visant le développement de la numératie, de la littératie ou le développement socio-émotionnel chez des élèves du préscolaire et du primaire. Ce sont les résultats détaillés de cette récension d’écrits qui feront l’objet de la communication. Bibliographie Axford, N., Berry, V., Lloyd, J., Moore, D., Rogers, M., Hurst, A., Blockley, K., Durkin,H. and Minton, J. (2019) How Can Schools Support Parents’ Engagement in their Children’s Learning? Evidence from Research and Practice. London: Education Endowment Foundation. Report available from: https://educationendowmentfoundation.org.uk/evidence-summaries/evidence-reviews/parental-engagement/ (retrieved February 2022). Castro, M., Expósito-Casas, E., López-Martín, E., Lizasoain, L., Navarro-Asencio, E., & Gaviria, J. (2015). Parental involvement on student academic achievement: A meta-analysis. Educational Research Review, 14, 33-46. http://dx.doi.org/10.1016/j.edurev.2015.01.002 Englund, M. M., Luckner, A. E., Whaley, G. J. L., & Egeland, B. (2004). Children's Achievement in Early Elementary School: Longitudinal Effects of Parental Involvement, Expectations, and Quality of Assistance. Journal of Educational Psychology, 96(4), 723–730. https://doi.org/10.1037/0022-0663.96.4.723 Garbacz, S. & Woods, Kathryn & Swanger-Gagné, Michelle & Taylor, Ashley & Black, Kathryn & Sheridan, Susan. (2008). The Effectiveness of a Partnership-Centered Approach in Conjoint Behavioral Consultation. School Psychology Quarterly, 23(3), 313-326. 10.1037/1045-3830.23.3.313. Huat See, B., & Gorard, S. (2015). The role of parents in young people’s education—a critical review of the causal evidence. Oxford Review of Education, 41, 346-366. [less ▲]

Detailed reference viewed: 228 (55 UL)
See detailPersonal Informatics at Work
van den Heuvel, Roy; Lallemand, Carine UL

Scientific Conference (2023, April)

An ever-increasing amount of sensor technologies surrounds our work environment, collecting data about workers? activity and wellbeing ? often without them having any say in this. This datafication of the ... [more ▼]

An ever-increasing amount of sensor technologies surrounds our work environment, collecting data about workers? activity and wellbeing ? often without them having any say in this. This datafication of the workplace can help find novel ways to stimulate healthy behaviors or increase productivity. However, the ubiquitous usage of data collectors in the workplace can also put employees in a position of power imbalance, where management is frequently aiming at ?optimizing? employees towards normative and more-than-often problematic standards of productivity and wellbeing. Yet, data-tracking practices might not only seek an optimum but also can be interpreted towards self-enhancement (Meissner, 2016). In this sense, optimization is not per se an improvement on previous goals, but rather allows ?the discovery of new opportunities?. Indeed, data can be a means of giving space for users to be curious about their own subjective work experiences. Personal Informatics research has mostly focused on leisure and health-related topics but it takes on different forms, requirements, and ethical considerations for a work context. To explore how such considerations emerge from material practices, we conducted a field study, deploying a research probe called Habilyzer at a workplace (N=5). Findings show that users explored aspects meaningful to them yet highlight discrepancies between the envisioned self-tracking goals and participants? practices. Regarding sensors? open-endedness, a balance between the burden of data collection and the value derived from it appeared critical. We contribute new insights into how open-ended sensor technologies can be designed to support self-tracking practices in the workplace. [less ▲]

Detailed reference viewed: 72 (1 UL)
See detailContinuer à faire réseau : le regard d’une chercheuse sur le projet Respadon (conclusion de la journée).
Schafer, Valerie UL

Scientific Conference (2023, March 13)

L’équipe de ResPaDon organise une journée d’échange autour des résultats et des perspectives de ce projet débuté en mars 2021. Des conditions d’accès aux collectes collaboratives, des enjeux juridiques à ... [more ▼]

L’équipe de ResPaDon organise une journée d’échange autour des résultats et des perspectives de ce projet débuté en mars 2021. Des conditions d’accès aux collectes collaboratives, des enjeux juridiques à la coopération entre acteurs nationaux et établissements de proximité, le Réseau de Partenaires pour l’exploration et l’analyse de données numériques (ResPaDon) propose de partager les résultats de sa démarche pour développer les usages scientifiques de la collection des archives du dépôt légal du web. [less ▲]

Detailed reference viewed: 31 (0 UL)
Peer Reviewed
See detailLehrer-Schüler-Beziehungen: Von der Generalisierbarkeit positiver Befunde
Emslander, Valentin UL; Holzberger, Doris

Scientific Conference (2023, March 01)

Zahlreiche Studien zeigen Zusammenhänge zwischen positiven Lehrer-Schüler-Beziehungen und Ergebnisvariablen im schulischen Kontext (z.B. Noten, wahrgenommene Leistung, soziales Verhalten, Lernmotivation ... [more ▼]

Zahlreiche Studien zeigen Zusammenhänge zwischen positiven Lehrer-Schüler-Beziehungen und Ergebnisvariablen im schulischen Kontext (z.B. Noten, wahrgenommene Leistung, soziales Verhalten, Lernmotivation; Givens Rolland, 2012; Korpershoek et al., 2016). Hierbei werden Lehrer-Schüler-Beziehungen ganz unterschiedlich konzeptualisiert: Während die Lehrer-Schüler-Interaktion vor allem den praktischen Austausch zwischen Lehrkraft und Schüler*in betrachtet (z.B. Beteiligung am Unterrichtsgespräch), verbindet die konstruktive Unterstützung durch die Lehrkraft unterrichtliche und inhaltliche Unterstützung mit der Wärme und Qualität der Lehrer-Schüler-Beziehung (vgl. Decristan et al., 2022; Endedijk et al., 2021; Hamre & Pianta, 2001). Beide Aspekte sind bedeutend für den schulischen Lernerfolg (Endedijk et al., 2021). Vor dem Hintergrund zahlreicher Befunde stellt sich die Frage der Generalisierbarkeit von Effekten positiver Lehrer-Schüler-Beziehungen und -Interaktionen: Profitieren alle Schüler*innen gleichermaßen von emotionaler Nähe und Freundlichkeit der Lehrkraft? Oder zeigen sich Unterschiede, beispielsweise zwischen Jungen und Mädchen oder Schüler*innen verschiedenen Alters, inwieweit sich positive Lehrer-Schüler-Beziehungen auf Ergebnisvariablen auswirken? Auch die meta-analytische Literatur ist sich in diesen Fragen teilweise uneins (vgl. Lei et al., 2016; Roorda et al., 2017). Offen bleibt zudem, welche Schüler*innen besondere Nachteile haben bei einer negativen Lehrer-Schüler-Beziehung (Nurmi, 2012). Unser Symposium zeichnet ein umfassendes Bild dieser wichtigen Beziehung und Interaktion im Herzen der schulischen Bildung anhand der Generalisierbarkeit gefundener Effekte: Der erste Beitrag (Emslander et al., 2023) vergleicht die Rolle der elterliche Unterstützung mit der Unterstützung durch die Lehrkraft auf die akademische Entwicklung der Schüler*innen. Die umfangreiche längsschnittliche Studie verwendet Daten von Haupt-, Real- und Mittelschulen über einen Zeitraum von vier Jahren in der Adoleszenz. Ein Augenmerk liegt auf Unterschieden in den Zusammenhängen zwischen der fünften und achten Klasse. Der zweite Beitrag untersucht den Einfluss der Fehlerkultur bei der Beteiligung am Unterrichtsgespräch. Mithilfe von Videodaten werden Unterrichtsstunden in Mathematik und Deutsch untersucht. Die Studie untersucht differenzielle Befunde der Zusammenhänge in Abhängigkeit des Selbstkonzepts und Migrationshintergrunds von Schüler*innen. Ein dritter Beitrag beschäftigt sich mit dem moderierenden Einfluss der Schülerwahrnehmung von konstruktiven Lehrkraftunterstützung in der Sekundarstufe und ihrem Zusammenhang zu mathematischen Selbstkonzept und Interesse. Das besondere Augenmerk dieser Studie liegt auf den Unterschieden in der Motivation von jungen Frauen und Männern für das Fach Mathematik. Abschließend bietet ein vierter Beitrag einen Überblick über Korrelate von Lehrer-Schüler-Beziehungen in der Literatur. Das systematische Review von Meta-Analysen illustriert Zusammenhänge, Moderatoren und Studienqualität auf dem Gebiet der Lehrer-Schüler-Beziehungen. Besonders werden Alter und Geschlecht der Schüler*innen ebenso wie wer die Lehrer-Schüler-Beziehung einschätzt kontrovers diskutiert. LITERATUR Decristan, J., Kunter, M., & Fauth, B. (2022). Die Bedeutung individueller Merkmale und konstruktiver Unterstützung der Lehrkraft für die soziale Integration von Schülerinnen und Schülern im Mathematikunterricht der Sekundarstufe. Zeitschrift für Pädagogische Psychologie, 36(1–2), 85–100. https://doi.org/10.1024/1010-0652/a000329 Emslander, V., Holzberger, D., Fischbach, A., & Scherer, R. (2023, January 3). Lehrer-Schüler-Beziehungen und ihre Korrelate: Ein systematisches Review von Meta-Analysen [Teacher-Student Relationships and their Correlates: A systematic Review of Meta-Analyses]. In Emslander, V., & Holzberger, D. (Eds.) (2023, February 28 – March 2). Lehrer-Schüler-Beziehungen: Von der Generalisierbarkeit positiver Befunde [Teacher-Student Relationships: Of the Generalizability of Positive Results]. Symposium at the 10th Conference of the Society for Empirical Educational Research (GEBF), Essen, Germany. http://hdl.handle.net/10993/54530 Endedijk, H. M., Breeman, L. D., van Lissa, C. J., Hendrickx, M. M. H. G., den Boer, L., & Mainhard, T. (2021). The Teacher’s Invisible Hand: A Meta-Analysis of the Relevance of Teacher–Student Relationship Quality for Peer Relationships and the Contribution of Student Behavior. Review of Educational Research, 92(3). https://doi.org/10.3102/00346543211051428 Givens Rolland, R. (2012). Synthesizing the Evidence on Classroom Goal Structures in Middle and Secondary Schools: A Meta-Analysis and Narrative Review. Review of Educational Research, 82(4), 396–435. https://doi.org/10.3102/0034654312464909 Hamre, B. K., & Pianta, R. C. (2001). Early Teacher-Child Relationships and the Trajectory of Children’s School Outcomes through Eighth Grade. Child Development, 72(2), 625–638. https://doi.org/10.1111/1467-8624.00301 Korpershoek, H., Harms, T., de Boer, H., van Kuijk, M., & Doolaard, S. (2016). A Meta-Analysis of the Effects of Classroom Management Strategies and Classroom Management Programs on Students’ Academic, Behavioral, Emotional, and Motivational Outcomes. Review of Educational Research, 86(3), 643–680. https://doi.org/10.3102/0034654315626799 Lei, H., Cui, Y., & Chiu, M. M. (2016). Affective Teacher—Student Relationships and Students’ Externalizing Behavior Problems: A Meta-Analysis. Frontiers in Psychology, 7. https://doi.org/10.3389/fpsyg.2016.01311 Nurmi, J.-E. (2012). Students’ characteristics and teacher–child relationships in instruction: A meta-analysis. Educational Research Review, 7(3), 177–197. https://doi.org/10.1016/j.edurev.2012.03.001 Roorda, D. L., Jak, S., Zee, M., Oort, F. J., & Koomen, H. M. Y. (2017). Affective Teacher–Student Relationships and Students’ Engagement and Achievement: A Meta-Analytic Update and Test of the Mediating Role of Engagement. School Psychology Review, 46(3), 239–261. https://doi.org/10.17105/SPR-2017-0035.V46-3 [less ▲]

Detailed reference viewed: 33 (3 UL)
Peer Reviewed
See detailDiversifikation im Klassenzimmer – ein Einwegspiegel?
Pit-Ten Cate, Ineke UL; Rivas, Salvador UL; Busana, Gilbert UL

Scientific Conference (2023, March 01)

Detailed reference viewed: 41 (0 UL)
Peer Reviewed
See detailLehrer-Schüler-Beziehungen und ihre Korrelate: Ein systematisches Review von Meta-Analysen
Emslander, Valentin UL; Holzberger, Doris; Fischbach, Antoine UL et al

Scientific Conference (2023, March 01)

THEORETISCHER HINTERGRUND Gute Beziehungen zur eigenen Lehrerin können sich positiv auf den Erfolg eines Schülers auswirken. Dieser Effekt kann mit Bowlby’s (1982) Bindungstheorie erklärt werden und wird ... [more ▼]

THEORETISCHER HINTERGRUND Gute Beziehungen zur eigenen Lehrerin können sich positiv auf den Erfolg eines Schülers auswirken. Dieser Effekt kann mit Bowlby’s (1982) Bindungstheorie erklärt werden und wird empirisch immer wieder gestützt (z.B. Hamre & Pianta, 2001). Positive Lehrer-Schüler-Beziehungen zeichnen sich durch emotionale Wärme und Nähe aus; negative Aspekte durch Konflikt und Abhängigkeit. So stehen positive Lehrer-Schüler-Beziehungen nicht nur mit akademischen Leistungen in Verbindung, sondern auch mit einer Vielzahl anderer, wünschenswerter Schülerentwicklungen. Zahlreiche Meta-Analysen deuten auf signifikante Zusammenhänge zwischen Lehrer-Schüler-Beziehungen und schulischem Engagement, guten Beziehungen zu Gleichaltrigen, exekutiven Funktionen, allgemeinem Wohlbefinden und der Verringerung aggressiver oder störender Verhaltensweisen hin (Endedijk et al., 2021; Nurmi, 2012; Roorda et al., 2017; Vandenbroucke et al., 2018). Diese Befunde sind jedoch weit verstreut in der Literatur, sodass Forschungslücken unentdeckt bleiben. Auch unterscheiden sich bisherige Überblicksarbeiten in ihren Methoden und den gefundenen Zusammenhängen zwischen Lehrer-Schüler-Beziehungen und Ergebnisvariablen von Schüler*innen. Darüber hinaus ist die Literatur uneindeutig, welche Moderatoren (z.B. Alter oder Geschlecht) diese Beziehungen beeinflussen. Gleichzeitig variiert die Qualität der Meta-Analysen in diesem Feld merklich, was die Interpretation ihrer Ergebnisse erschweren kann. FRAGESTELLUNG Angesichts dieser Forschungslücken haben wir die meta-analytische Literatur systematisch durchsucht und zusammengefasst (Cooper & Koenka, 2012), um einen Überblick über Korrelate von Lehrer-Schüler-Beziehungen zu schaffen. Hierbei untersuchten wir drei Forschungsfragen 1. Inwieweit hängen akademische, verhaltensbezogene, sozio-emotionale, motivationale und kognitive Schülereigenschaften mit Lehrer-Schüler-Beziehungen in der meta-analytischen Literatur zusammen? 2. Welche Moderatoren beeinflussen diese Zusammenhänge? 3. Welche methodische Qualität haben die einbezogenen Meta-Analysen? METHODE Um diese Forschungsfragen zu beantworten, analysierten wir 24 Meta-Analysen, die rund 130 Effektstärken für über eine Million Schüler*innen umfassten. Nach der Präregistrierung erfolgte eine systematische Literatursuche. Während mehrerer Runden der Überprüfung mithilfe unserer Ein- und Ausschlusskriterien identifizierten wir 24 passende Meta-Analysen. Aus diesen Meta-Analysen extrahierten wir die Effektstärken zum Zusammenhang von Lehrer-Schüler-Beziehungen und akademische, verhaltensbezogene, sozio-emotionale, motivationale und allgemeine kognitive Schülereigenschaften. Für die Forschungsfragen 1 und 2 haben wir die Ergebnisse zusammengefasst und einen narrativen Überblick erarbeitet. Für Forschungsfrage 3 bewerteten wir die Qualität der Meta-Analysen mit Hilfe der AMSTAR-2 Skala (angepasst an korrelative Studien in der Psychologie und Bildungsforschung; Shea et al., 2017). ERGEBNISSE UND IHRE BEDEUTUNG Mit Blick auf die Lehrer-Schüler-Beziehungen werden unterschiedliche Ergebnisvariablen analysiert (Forschungsfrage 1). Die stärksten Zusammenhänge zeigten sich für Konflikt und Abhängigkeit in der Lehrer-Schüler-Beziehung mit Verhaltensproblemen der Schüler*innen (r = .35 bis .57; Nurmi, 2012). Positive Lehrer-Schüler-Beziehungen zeigte die stärkste Verbindung mit der Beteiligung in der Schule (r = .26 bis .34; Roorda et al., 2011), prosozialem, externalisierendem und internalisierendem Verhalten (r = .25; Endedijk et al., 2021) sowie mit Lernmotivation in Kombination mit Beteiligung der Schüler*innen (r = .23; Wang et al., 2020). Alter oder Klassenstufe waren die am häufigsten untersuchten Moderatoren mit teilweise gegenläufigen Befunden (Forschungsfrage 2). Geschlechterunterschiede wurden dagegen seltener festgestellt. Gleichzeitig wurde der Effekt der Informationsquelle häufig untersucht, d.h., ob und auf welche Weise Lehrkräfte, Gleichaltrige oder die Schüler*innen selbst die Lehrer-Schüler-Beziehung bewerteten. Für Forschunsgfrage 3 diskutieren wir die Qualitätsunterschiede der Meta-Analysen. Mit dem systematischen Review von Meta-Analysen fassen wir die Forschungslandschaft zu Korrelaten von Lehrer-Schüler-Beziehungen zusammen und zeigen, in welchem Zusammenhang diese mit Lehrer-Schüler-Beziehungen stehen. Unseren Ergebnissen folgend sollten Lehrkräfte für die Wirkung von Lehrer-Schüler-Beziehungen und deren Zusammenhängen sensibilisiert werden. Einige Interventionen zur Verbesserung von dieser wichtigen Beziehungen wurden bereits meta-analytisch mit vielversprechende Ergebnissen untersucht (Kincade et al., 2020). Ein nächster Schritt ist nun die experimentelle Überprüfung der gefundenen Korrelate, um positive Lehrer-Schüler-Beziehungen als wirksame Strategie zur Verbesserung von akademischen, verhaltensbezogenen, sozio-emotionalen, motivationalen und kognitiven Schülereigenschaften kausal zu bestätigen. LITERATUR Bowlby, J. (1982). Attachment and loss: Vol. 1. Attachment. (2nd ed., Vol. 1). Basic Books. Cooper, H., & Koenka, A. C. (2012). The overview of reviews: Unique challenges and opportunities when research syntheses are the principal elements of new integrative scholarship. American Psychologist, 67(6), 446–462. https://doi.org/10.1037/a0027119 Decristan, J., Kunter, M., & Fauth, B. (2022). Die Bedeutung individueller Merkmale und konstruktiver Unterstützung der Lehrkraft für die soziale Integration von Schülerinnen und Schülern im Mathematikunterricht der Sekundarstufe. Zeitschrift für Pädagogische Psychologie, 36(1–2), 85–100. https://doi.org/10.1024/1010-0652/a000329 Endedijk, H. M., Breeman, L. D., van Lissa, C. J., Hendrickx, M. M. H. G., den Boer, L., & Mainhard, T. (2021). The Teacher’s Invisible Hand: A Meta-Analysis of the Relevance of Teacher–Student Relationship Quality for Peer Relationships and the Contribution of Student Behavior. Review of Educational Research, 003465432110514. https://doi.org/10.3102/00346543211051428 Givens Rolland, R. (2012). Synthesizing the Evidence on Classroom Goal Structures in Middle and Secondary Schools: A Meta-Analysis and Narrative Review. Review of Educational Research, 82(4), 396–435. https://doi.org/10.3102/0034654312464909 Hamre, B. K., & Pianta, R. C. (2001). Early Teacher-Child Relationships and the Trajectory of Children’s School Outcomes through Eighth Grade. Child Development, 72(2), 625–638. https://doi.org/10.1111/1467-8624.00301 Kincade, L., Cook, C., & Goerdt, A. (2020). Meta-Analysis and Common Practice Elements of Universal Approaches to Improving Student-Teacher Relationships. Review of Educational Research, 90(5), 710–748. https://doi.org/10.3102/0034654320946836 Korpershoek, H., Harms, T., de Boer, H., van Kuijk, M., & Doolaard, S. (2016). A Meta-Analysis of the Effects of Classroom Management Strategies and Classroom Management Programs on Students’ Academic, Behavioral, Emotional, and Motivational Outcomes. Review of Educational Research, 86(3), 643–680. https://doi.org/10.3102/0034654315626799 Lei, H., Cui, Y., & Chiu, M. M. (2016). Affective Teacher—Student Relationships and Students’ Externalizing Behavior Problems: A Meta-Analysis. Frontiers in Psychology, 7. https://doi.org/10.3389/fpsyg.2016.01311 Nurmi, J.-E. (2012). Students’ characteristics and teacher–child relationships in instruction: A meta-analysis. Educational Research Review, 7(3), 177–197. https://doi.org/10.1016/j.edurev.2012.03.001 Roorda, D. L., Jak, S., Zee, M., Oort, F. J., & Koomen, H. M. Y. (2017). Affective Teacher–Student Relationships and Students’ Engagement and Achievement: A Meta-Analytic Update and Test of the Mediating Role of Engagement. School Psychology Review, 46(3), 239–261. https://doi.org/10.17105/SPR-2017-0035.V46-3 Roorda, D. L., Koomen, H. M. Y., Spilt, J. L., & Oort, F. J. (2011). The Influence of Affective Teacher–Student Relationships on Students’ School Engagement and Achievement: A Meta-Analytic Approach. Review of Educational Research, 81(4), 493–529. https://doi.org/10.3102/0034654311421793 Shea, B. J., Reeves, B. C., Wells, G., Thuku, M., Hamel, C., Moran, J., Moher, D., Tugwell, P., Welch, V., Kristjansson, E., & Henry, D. A. (2017). AMSTAR 2: A critical appraisal tool for systematic reviews that include randomised or non-randomised studies of healthcare interventions, or both. BMJ, j4008. https://doi.org/10.1136/bmj.j4008 Vandenbroucke, L., Spilt, J., Verschueren, K., Piccinin, C., & Baeyens, D. (2018). The Classroom as a Developmental Context for Cognitive Development: A Meta-Analysis on the Importance of Teacher–Student Interactions for Children’s Executive Functions. Review of Educational Research, 88(1), 125–164. https://doi.org/10.3102/0034654317743200 Wang, M.-T., L. Degol, J., Amemiya, J., Parr, A., & Guo, J. (2020). Classroom climate and children’s academic and psychological wellbeing: A systematic review and meta-analysis. Developmental Review, 57, 100912. https://doi.org/10.1016/j.dr.2020.100912 [less ▲]

Detailed reference viewed: 29 (2 UL)
See detailTable ronde : L'historiographie de l'histoire des relations internationales en Belgique 1950-1970
Briamont, Thomas; Brüll, Christoph UL; Sierens, Vivien

Scientific Conference (2023, February 17)

Detailed reference viewed: 23 (1 UL)
Full Text
See detailInvestigation of OpenFOAM-XDEM momentum coupling results for AWJC Nozzle using preCICE
Adhav, Prasad UL

Scientific Conference (2023, February 14)

The high-speed water jet is the momentum source in an Abrasive Water Jet Cutting Nozzle. This momentum is transferred to the abrasive particles & the air within the nozzle. This leads to turbulent ... [more ▼]

The high-speed water jet is the momentum source in an Abrasive Water Jet Cutting Nozzle. This momentum is transferred to the abrasive particles & the air within the nozzle. This leads to turbulent & complex particle-laden flow in the nozzle. These flow conditions can influence particle impacts on the nozzle, thus influencing erosion. Hence it is imperative that this complex particle-laden flow is captured correctly. The momentum exchange can be directly from the water jet to the particles or indirectly through the airflow. In this work, we investigate these fluid-particle momentum exchanges. Our prototype uses preCICE for volumetric coupling of XDEM (for the particle motion), & OpenFOAM (for the fluid). XDEM uses fluid flow conditions to compute the forces acting on particles. XDEM computes the particle momentum source that is injected into the fluid solver. The results of the coupled simulation align with literature & can be extended to include the FEM component for erosion predictions. [less ▲]

Detailed reference viewed: 45 (1 UL)
See detailExplorers presenter
Cauvin, Thomas UL

Scientific Conference (2023, February 01)

Detailed reference viewed: 23 (0 UL)
Peer Reviewed
See detailWhich Factors Play a Role in CoCo Issuance? Evidence from European Banks
Wolff, Christian UL

Scientific Conference (2023, February)

Detailed reference viewed: 8 (2 UL)
Full Text
See detailEMN Inform "Transition of unaccompanied minors to adulthood"
Sommarribas, Adolfo UL

Scientific Conference (2023, January 31)

This presentation shares the main results of the EMN Inform Transition of unaccompanied minors to adulthood" indicating what are the challenges that unaccompanied minors confront when they reach adulthood ... [more ▼]

This presentation shares the main results of the EMN Inform Transition of unaccompanied minors to adulthood" indicating what are the challenges that unaccompanied minors confront when they reach adulthood and how Member States respond to this situation. [less ▲]

Detailed reference viewed: 23 (0 UL)
Full Text
See detailBreakthrough of directional statistics in space science
Palmirotta, Guendalina UL

Scientific Conference (2023, January 24)

It should be no surprise that already back in the 17-18th centuries important foundations of modern statistical theory were formulated to address astronomical problems, the astronomers were the ... [more ▼]

It should be no surprise that already back in the 17-18th centuries important foundations of modern statistical theory were formulated to address astronomical problems, the astronomers were the statisticians. For instance the 'almost coincidence' in the orbits of the planets in our Solar System with the ecliptic has intrigued the scientists for a long time. Even D. Bernoulli (in the 1730's) wondered if this fact could happen 'by chance'. In a statistical framework, one could think of using a uniformity test on the sphere. Testing isotropy or, equivalently, testing uniformity on the unit hypersphere is one of the oldest as well as most fundamental problems in directional statistics and it is still much considered nowadays. Furthermore with the increasing astronomical data, innovative modern directional statistical theories and models have been proposed to deal with space science issues such as tracking space objects. In this talk, we will provide a review of the many old and recent developments of directional statistics animated by interesting applications in space science. This is a joint work with Christophe Ley. [less ▲]

Detailed reference viewed: 26 (4 UL)
Full Text
See detailNew results in finite mixture modeling
Schiltz, Jang UL; Noel, Cédric

Scientific Conference (2023, January 05)

Detailed reference viewed: 16 (0 UL)
Full Text
Peer Reviewed
See detailNon-Standard errors
Wolff, Christian UL

Scientific Conference (2023, January)

Detailed reference viewed: 7 (1 UL)
Full Text
Peer Reviewed
See detailXRP-NDN overlay: Improving the Communication Efficiency of Consensus-Validation based Blockchains with an NDN Overlay
Trestioreanu, Lucian Andrei UL; Shbair, Wazen UL; Scheidt de Cristo, Flaviene UL et al

Scientific Conference (2023)

With growing adoption of Distributed Ledger Technologies, their networks must scale while maintaining efficient communication for the underlying consensus and replication mechanisms. New content ... [more ▼]

With growing adoption of Distributed Ledger Technologies, their networks must scale while maintaining efficient communication for the underlying consensus and replication mechanisms. New content distribution concepts like Named Data Networking create opportunities to achieve this goal. We present and evaluate XRP-NDN overlay, a solution to increase communication efficiency for consensus-validation blockchains like XRP Ledger. We send consensus messages over different communication models and show that the chosen model lowers the number of messages at node level to minimum, while maintaining or improving performance by leveraging overlay advantages. [less ▲]

Detailed reference viewed: 32 (7 UL)
Full Text
Peer Reviewed
See detailDeep Learning-Based Device-Free Localization in Wireless Sensor Networks
Abdullah, Osamah; Al-Hraishawi, Hayder UL; Chatzinotas, Symeon UL

Scientific Conference (2023)

Location-based services are witnessing a rise in popularity owing to their key features of delivering personalized digital experience. The recent developments in wireless sensing techniques make the ... [more ▼]

Location-based services are witnessing a rise in popularity owing to their key features of delivering personalized digital experience. The recent developments in wireless sensing techniques make the realization of device-free localization (DFL) feasible within wireless sensor network (WSN) architectures. The DFL is an emerging technology that utilizes radio signal information for detecting and positioning a passive movable target without attached devices. However, determining the characteristics of the massive raw signals and extracting meaningful discriminative features relevant to the localization are highly intricate tasks due to the different patterns associated with different locations. To overcome these issues, deep learning (DL) techniques can be utilized here owing to their remarkable performance gains in similar practical problems. In this direction, we propose a DFL framework consists of multiple convolutional neural network (CNN) layers along with deep autoencoders based on the restricted Boltzmann machines (RBM) to construct a convolutional deep belief network (CDBN) for features recognition and extracting. Each CNN layer has stochastic pooling to sample down the feature map and reduced the dimensions of the required data without losing important information. This dimensionality reduction can alleviate the heavy computation while ensuring precise localization. The proposed framework is validated using real experimental dataset. The results show that the proposed model is able to achieve a high accuracy of 98% with reduced data dimensions and low signal-to-noise ratios (SNRs). [less ▲]

Detailed reference viewed: 66 (5 UL)
Peer Reviewed
See detailSchedulability Analysis of CAN and CAN FD Authentication
Ikumapayi, Omolade; Olufowobi, Habeeb; Daily, Jeremy et al

Scientific Conference (2023)

Ensuring the data integrity of messages transmitted over the Controller Area Network (CAN) bus and other vehicular networks is achieved through the implementation of cryptographic authentication protocols ... [more ▼]

Ensuring the data integrity of messages transmitted over the Controller Area Network (CAN) bus and other vehicular networks is achieved through the implementation of cryptographic authentication protocols. However, these protocols raise concerns about a significant increase in response time due to the restrictions on CAN frame size and bandwidth. This paper presents a comprehensive analysis of the impact on response time of CAN and CAN Flexible Data-rate (CAN FD) messages with the implementation of cryptographic message authentication codes (MACs) and the periodic transmission of these codes. Our evaluation is based on a randomized schedulability experiment to provide insights into the overhead incurred by adding authentication to the frame payloads. [less ▲]

Detailed reference viewed: 25 (0 UL)
See detailResults - TRB
Bigi, Federico UL

Scientific Conference (2023)

Detailed reference viewed: 21 (3 UL)
Full Text
Peer Reviewed
See detailYou Can Dance! Generating Music-Conditioned Dances on Real 3D Scans.
Dupont, Elona UL; Singh, Inder Pal UL; Fuentes, Laura et al

Scientific Conference (2023)

Detailed reference viewed: 39 (1 UL)
Full Text
See detailTowards assimilating SAR data into an anisotropic model of an underground aquifer
Salehian Ghamsari, Sona UL; van Dam, Tonie UL; Hale, Jack UL

Scientific Conference (2023)

In this study, we aim to shed light on the feasibility of assimilating synthetic aperture radar (SAR) data into a partial differential equation-based model of a poroelastic homogeneous aquifer with ... [more ▼]

In this study, we aim to shed light on the feasibility of assimilating synthetic aperture radar (SAR) data into a partial differential equation-based model of a poroelastic homogeneous aquifer with anisotropic hydraulic conductivity (AHC). Although other authors [1] have considered the problem of assimilating SAR data into a poroelastic model that uses an inhomogeneous isotropic random field model for hydraulic conductivity, to the best of our knowledge, our study is the first to consider assimilating SAR data into a poroelastic model with AHC. Our study is inspired by the work of [2] where an aquifer test is performed on the Anderson Junction aquifer in southwestern Utah. Due to the inherent preferential direction of the fractured sandstone at the Anderson Junction site, the ratio of hydraulic conductivity along the principal axes can be on the order of 24 to 1. We build an anisotropically conductive poroelastic finite element model of the Anderson Junction site that can predict the coupled fluid flow and mechanical displacements. Our results show that the effective elastic response of the aquifer on the Earth’s surface has an anisotropic nature driven by the underlying anisotropy in the fluid problem, even when the elasticity problem is assumed to be isotropic. We interpret these results in the context of using SAR data to improve the characterization of aquifer systems, like the Anderson Junction site, with strongly anisotropic behavior. The Doctoral Training Unit Data-driven computational modelling and applications (DRIVEN) is funded by the Luxembourg National Research Fund under the PRIDE programme (PRIDE17/12252781). [1] Amal Alghamdi. Bayesian inverse problems for quasi-static poroelasticity with application to ground water aquifer characterization from geodetic data. PhD thesis, 2020. https://repositories.lib.utexas.edu/handle/2152/86231. [2] Victor M. Heilweil and Paul A. Hsieh. Determining Anisotropic Transmissivity Using a Simplified Papadopulos Method. Groundwater, 44(5):749–753, 2006. 10.1111/j.1745-6584.2006.00210.x [less ▲]

Detailed reference viewed: 86 (19 UL)
Full Text
See detailConnecting culture to geometry - problem based learning across subjects
Ulbrich, Eva; Hosic, Rusmir; Haas, Ben et al

Scientific Conference (2022, December 16)

Symbols are used to visualise and understand abstract mathematical concepts. According to Duval (1999), visualisations are the core of understanding mathematics and creating a visualisation involves ... [more ▼]

Symbols are used to visualise and understand abstract mathematical concepts. According to Duval (1999), visualisations are the core of understanding mathematics and creating a visualisation involves reasoning and construction. This is also common in culture, for example, in religions where internalisation and externalisation are used for reflection (Vicini, 2017) that might be a visualisation such as geometric art. We want to create learning situations for problem based learning useful for various subjects (i.e., mathematics, history, culture, arts) in primary school based on geometrical shapes. Geometrical shapes are among symbols used in human beliefs (e.g., the cross in Christianity, the star of David in Judaism or the wheel of law in Buddhism) and can be found on buildings and several school books. Visualisations, e.g. in Islam, can be based on polygons, stars or rosettas (Abdullahi & Embi, 2013). Lesson plans combining cultural subjects such as history or art with mathematics are not common, but we believe there is a visible connection with geometric art. Therefore, we aim to find out whether teachers from subjects with a cultural background are interested in such lesson plans and which attributes they should have to combine the subject, geometry and technology in a maker-centred learning experience (Michael & Jones, 2020). We plan on a qualitative approach, first introducing an activity and then interviewing primary school children and their teachers for their perceptions and learnings. For a first orientation of attributes and teacher needs, we created an activity to develop bookmarks in 2D and 3D using chequered paper and the 3D modelling software TinkerCAD for over 50 primary school students. The lesson plan and comments of the student's teachers hinting towards attributes will be presented, and future steps will be discussed. [less ▲]

Detailed reference viewed: 32 (7 UL)
Full Text
See detailOn Improving Slant Wet delays for Tracking Severe Weather Events: An evaluation During Two Storms in Europe
Teferle, Felix Norman UL; Hunegnaw, Addisu UL; Duman, Huseyin et al

Scientific Conference (2022, December 14)

Climate change has led to an increase in the frequency and severity of weather events with intense precipitation and, subsequently, a greater susceptibility of communities around the world to flash ... [more ▼]

Climate change has led to an increase in the frequency and severity of weather events with intense precipitation and, subsequently, a greater susceptibility of communities around the world to flash flooding. Networks of ground-based Global Navigation Satellite System (GNSS) stations enable the measurement of integrated water vapor along slant pathways, providing three-dimensional (3D) water vapor distributions at low-cost and in real-time. This makes these data a valuable complementary source of information for tracking storm events and predicting their paths. However, it is well established that residual modelling errors and multipath (MP) effects at GNSS stations do impact incoming signals, especially at low elevations and during storms when the atmospheric conditions change rapidly. Until now, the bulk of GNSS products for meteorology are estimates of the more conventional zenith total delays and horizontal gradients, but these products may not be most appropriate for determining 3D distributions of water vapor during convective storm events. In this study we investigate the impact of residual-phase-corrected and multipath-corrected slant wet delay (SWD) estimates on tracking extreme weather events using two events in Europe that led to flooding, damage to property and loss of life. We employed Precise Point Positioning (PPP) with integer ambiguity resolution to generate station-specific MP correction maps. The spatial stacking was carried out in congruent cells with an optimal resolution in elevation and azimuth at the local horizon but with decreasing azimuth resolution as the elevation angle increases. This permits an approximately equal number of observations allocated to each cell. In our analysis we recovered the one-way SWD by adding GNSS post-fit phase residuals, representing the non-isotropic component of the SWD, i.e., the higher-order inhomogeneity. Using the derived MP maps in a final step, the one-way SWD were improved to employ them for the analysis of the weather event. Moreover, we validated the SWD between ground-based water-vapor radiometry and GNSS-derived SWD for different elevation angles. Furthermore, the spatio-temporal fluctuations in the SWD as measured by GNSS closely mirrored the moisture field from the ERA5 re-analysis associated with this severe weather event [less ▲]

Detailed reference viewed: 25 (1 UL)
Full Text
Peer Reviewed
See detailSmart charging of EVs: Would you share your data for money?
Marxen, Hanna UL; Ansarin, Mohammad

Scientific Conference (2022, December 11)

Many governments worldwide aim to eventually replace most combustion engines on the roads with electric vehicles (EVs). But this change causes an additional load on the electrical grid, especially if many ... [more ▼]

Many governments worldwide aim to eventually replace most combustion engines on the roads with electric vehicles (EVs). But this change causes an additional load on the electrical grid, especially if many EVs are charged simultaneously at peak times. Smart charging is a solution to better distribute the load throughout the day or night, while considering consumer preferences. For home charging, the idea is for EV users to always plug in their EVs when they are at home, and for the energy supplier to then decide when to charge which EV. By using (sensitive) consumer data, such as charging history, location of the smartphone and calendar information, the energy supplier can plan and optimize the charging of the EVs even better. In a survey, we seek to understand which of these data consumers are willing to share for smart charging, and what factors, such as privacy concerns and data sharing habits, influence this decision. Furthermore, in an experiment within the survey, we investigate whether consumers are more willing to share data if they receive monetary incentives. Our research design is based on the theoretical framework of Barth and de Jong (2017). 20 participants took part in the pretest, after which we adjusted the survey. We then shared the survey through various channels. [less ▲]

Detailed reference viewed: 65 (2 UL)
Full Text
See detailHigh-Performance Computing for the simulation of particles with the Discrete Element Method
Besseron, Xavier UL

Scientific Conference (2022, December 09)

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete ... [more ▼]

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete Element Method (DEM), a numerical method for the simulation of the motion of granular materials. We will cover the main parallelization paradigms and their implementations (shared memory with OpenMP and distributed memory with MPI), present the performance bottlenecks and introduce load-balancing techniques. [less ▲]

Detailed reference viewed: 13 (2 UL)
Full Text
See detail“When publics co-produce history in museums: skills, methodologies and impact of participation”
Cauvin, Thomas UL

Scientific Conference (2022, December 07)

Detailed reference viewed: 23 (0 UL)
Full Text
Peer Reviewed
See detailRate Splitting Multiple Access for Cognitive Radio GEO-LEO Co-Existing Satellite Networks
Khan, Wali Ullah UL; Ali, Zain; Lagunas, Eva et al

Scientific Conference (2022, December 07)

Low Earth orbit (LEO) satellite communication has drawn particular attention recently due to its high data rate services and low round-trip latency. It is low-cost to launch and can provide global ... [more ▼]

Low Earth orbit (LEO) satellite communication has drawn particular attention recently due to its high data rate services and low round-trip latency. It is low-cost to launch and can provide global coverage. However, the spectrum scarcity might be one of the critical challenges in the growth of LEO satellites, impacting severe restrictions on the development of ground-space integrated networks. To address this issue, we propose rate splitting multiple access (RSMA) for cognitive radio (CR) enabled nongeostationary orbit (GEO)-LEO coexisting satellite network. In particular, this work aims to maximize the system's sum rate by simultaneously optimizing the power allocation and subcarrier beam assignment of LEO satellite communication while restricting the interference temperature to GEO satellite users. The problem of sum rate maximization is formulated as non-convex and a Global optimal solution is challenging to obtain. Therefore, we first employ the successive convex approximation technique to reduce the complexity and make the problem more tractable. Then for the power allocation, we exploit Karush–Kuhn–Tucker (KKT) condition and adopt an efficient algorithm based on the greedy approach for subcarrier beam assignment. We also propose two suboptimal schemes with fixed power allocation and random subcarrier beam assignment. [less ▲]

Detailed reference viewed: 33 (10 UL)
Peer Reviewed
See detailSchool tracking in Luxembourg: the longitudinal impact of student characteristics and school composition
Pit-Ten Cate, Ineke UL; Ottenbacher, Martha UL; Alieva, Aigul et al

Scientific Conference (2022, December 05)

Research question: The current study aimed to investigate the influence of student and school level factors on school tracking in secondary education. We were especially interested in the association ... [more ▼]

Research question: The current study aimed to investigate the influence of student and school level factors on school tracking in secondary education. We were especially interested in the association between student characteristics and school composition in Grade 3 and school track in Grade 9. Data source: Data were collected as part of the Luxembourg school monitoring programme “Épreuves Standardisées” (ÉpStan; Fischbach et al., 2014). The study cohort include all students enrolled in the Luxembourg public education system in Grade 3 in November 2013 combined with data from the same students in Grade 9 in November 2017-2019 for students following advanced or regular educational pathways, completed with data from November 2020 and 2021 for students that repeated once or twice (N≈3600). Theoretical approach: The study draws upon theoretical frameworks and empirical findings (e.g., Boudon, 1974; Bourdieu, 1984), that have demonstrated students´ socio-demographic characteristics are associated with (dis)advantages for specific groups of students in education systems as well as more recent work focusing on school composition (e.g., Baumert et al., 2006), especially as tracked school systems are known to be prone to social segregation (e.g., Hadjar & Gross, 2016). To date, most research on school segregation in tracked education systems such as Luxembourg has focused on individual student´s characteristics. However, with increasing heterogeneity of student cohorts and known differences in educational opportunities related to the social and ethnic composition of the school’s student body (e.g., Thrupp et al., 2002), the current research extents the existing literature by considering both individual (including prior academic achievement and socio-demographic characteristics) and school level factors (mean academic level and percentage of students from lower socio-economic and migration background) in predicting school track placement. Main findings: Results of a multilevel random effect logistic regression analysis in which we estimated marginal effects on the probability to be placed in the highest, middle or lowest track in Luxembourg show that even after controlling for student´s academic achievement, track placement is affected by the gender and socio-economic background of the student, whereby boys and students from low SES families have less chance to be placed in the highest track. The association with socio-economic background is not only visible on the student level but also on school level, whereby students attending primary schools with a higher percentage of low SES families have less chance to be orientated to the higher track compared to the middle track, regardless of the student´ individual academic performance. [less ▲]

Detailed reference viewed: 123 (14 UL)
Full Text
Peer Reviewed
See detailDynamic Beam-Layout Design for MEO High Throughput Satellite Systems
Chaker, Haythem UL; Chougrani, Houcine UL; Alves Martins, Wallace UL et al

Scientific Conference (2022, December 04)

We propose a traffic-oriented beam-layout optimization framework for a medium Earth orbit (MEO) high throughput satellite (HTS) system. The designed beam-layout plans have the objective of dynamic traffic ... [more ▼]

We propose a traffic-oriented beam-layout optimization framework for a medium Earth orbit (MEO) high throughput satellite (HTS) system. The designed beam-layout plans have the objective of dynamic traffic load balancing with minimal radio resource management. We model and evaluate the high directivity and the high reconfigurability capabilities of next-generation HTS systems that are equipped with a processing power on board. The resulting payload flexibility is compared numerically against the on-ground counterpart. Adequate key performance indicators, such as the Jain’s fairness index, the load distribution gap and optimization convergence time, are used to benchmark the system against state-of-the-art solutions. Results show that a dynamic HTS in MEO is capable of efficiently attaining high quality load balancing performance under realistic spatiotemporally varying traffic demands. [less ▲]

Detailed reference viewed: 107 (22 UL)
Full Text
Peer Reviewed
See detailAdaptive Beam Pattern Selection and Resource Allocation for NOMA-Based LEO Satellite Systems
Wang, Anyue UL; Lei, Lei; Hu, Xin et al

Scientific Conference (2022, December 04)

Detailed reference viewed: 46 (8 UL)
See detailThe Legality of EU Sanctions under International Investment Agreements
Garcia Olmedo, Javier UL

Scientific Conference (2022, December 02)

Detailed reference viewed: 25 (0 UL)
Full Text
See detailInterpretation and distinction between labour exploitation in the context of trafficking in human beings and particularly exploitative working conditions under the Employers Sanctions Directive
Sommarribas, Adolfo UL

Scientific Conference (2022, December 01)

This presentation presents the findings of the EMN Luxembourg inform entitled Interpretation and distinction between labour exploitation in the context of trafficking in human beings and particularly ... [more ▼]

This presentation presents the findings of the EMN Luxembourg inform entitled Interpretation and distinction between labour exploitation in the context of trafficking in human beings and particularly exploitative working conditions under the Employers Sanctions Directive and the conclusions of the Benelux thematic day entitled "Human Trafficking" on 11 October 2022 that took place under the Luxembourgish presidency of the Benelux. [less ▲]

Detailed reference viewed: 22 (0 UL)
Full Text
Peer Reviewed
See detailOptimizing Computational and Communication Resources for MEC Network Empowered UAV-RIS Communication
Mahmood, Asad UL; Xuan VU, Thang; Khan, Wali Ullah UL et al

Scientific Conference (2022, December)

With the technological evolution and new applications, user equipment (UEs) has become a vital part of our lives. However, limited computational capabilities and finite battery life bottleneck the ... [more ▼]

With the technological evolution and new applications, user equipment (UEs) has become a vital part of our lives. However, limited computational capabilities and finite battery life bottleneck the performance of computationally demanding applications. A practical solution to enhance the quality of experience (QoE) is to offload the extensive computation to the mobile edge cloud (MEC). Moreover, the network’s performance can be further improved by deploying an unmanned aerial vehicle (UAV) integrated with intelligent reflective surfaces (IRS): an effective alternative to massive antenna systems to enhance the signal quality and suppress interference. In this work, the MEC network architecture is assisted by UAV-IRS to provide computational services to the UEs. To do so, a cost minimization problem in terms of computing time and hovering energy consumption is formulated. Furthermore, to achieve an efficient solution to a formulated challenging problem, the original optimization problem is decoupled into sub-problems using the block-coordinate decent method. Moreover, numerical results are compared to baseline schemes to determine the effectiveness of the proposed scheme. Simulation results demonstrate that the optimal allocation of local computational resources results in minimizing tasks’ computational time and hovering energy consumption. [less ▲]

Detailed reference viewed: 47 (16 UL)
Full Text
Peer Reviewed
See detail"The Origins Of Chess" A Digital 3D Chess Artwork with Physics & AI
Capitanescu, Stefan; Temperoni, Alessandro UL; Franck, Christian UL

Scientific Conference (2022, November 30)

Chess and Artificial Intelligence (AI) have always been connected together as the game naturally challenges the ability of a computer to think. In this work, we present a novel chess game using AI and 3D ... [more ▼]

Chess and Artificial Intelligence (AI) have always been connected together as the game naturally challenges the ability of a computer to think. In this work, we present a novel chess game using AI and 3D technology for the implementation of the engine as well as for the physical installation of the game. For the engine, the Minimax algorithm is utilized to calculate the best possible move. The game is installed at the ”AI and Art” exhibition in the Computational Creativity Hub (CCH) of the University of Luxembourg. [less ▲]

Detailed reference viewed: 20 (2 UL)
See detailThe Implementation and Legality of EU Sanctions Against ‘Russian Nationals’
Garcia Olmedo, Javier UL; Finelli, Francesca UL

Scientific Conference (2022, November 25)

Detailed reference viewed: 56 (2 UL)
Full Text
Peer Reviewed
See detailInternships in Times of Crisis: Collaborative production of instructional videos at a distance
Reuter, Robert UL; Reeff, Alain; Busana, Gilbert UL

Scientific Conference (2022, November 24)

The Bachelor in Educational Sciences (BScE) at the University of Luxembourg offers a thorough and demanding teacher training program that combines academic and practical knowledge. As in many other ... [more ▼]

The Bachelor in Educational Sciences (BScE) at the University of Luxembourg offers a thorough and demanding teacher training program that combines academic and practical knowledge. As in many other initial teacher training programs, internships are a key part of each semester in the BScE. In the face of the COVID-19 health crisis, this essential part of our teacher training program could not be maintained. Indeed, the schools were closed, and the pupils were taught at a distance by their teachers. We therefore had to quickly innovate and set up alternative learning activities that best met the objectives of the internships. We thus asked our students to design and produce educational videos, in dyads, for the country's schools. The aim was to enable our students to develop the necessary skills to produce such learning resources and to make them available to schools via the Internet. We will describe, analyse and evaluate the scheme and the videos that were produced. We will also discuss possible lessons learned that might lead to adaptations in our training program. [less ▲]

Detailed reference viewed: 22 (1 UL)
Full Text
See detailPredicting depression in old age: Combining life course data with machine learning
Montorsi, Carlotta UL

Scientific Conference (2022, November 24)

Detailed reference viewed: 41 (0 UL)
Full Text
Peer Reviewed
See detailAttitudes, Preconceptions and Practices in Conversational AI Design
Hoehn, Sviatlana UL; Migge, Bettina; Schneider, Britta et al

Scientific Conference (2022, November 23)

Detailed reference viewed: 20 (0 UL)
Full Text
Peer Reviewed
See detailTolerating Resource Exhaustion Attacks in the Time-Triggered Architecture
Alkoudsi, Mohammad Ibrahim; Fohler, Gerhard; Volp, Marcus UL

Scientific Conference (2022, November 21)

The Time-Triggered Architecture (TTA) presents a blueprint for building safe and real-time constrained distributed systems, based on a set of orthogonal concepts that make extensive use of the ... [more ▼]

The Time-Triggered Architecture (TTA) presents a blueprint for building safe and real-time constrained distributed systems, based on a set of orthogonal concepts that make extensive use of the availability of a globally consistent notion of time and a priori knowledge of events. Although the TTA tolerates arbitrary failures of any of its nodes by architectural means (active node replication, a membership service, and bus guardians), the design of these means considers only accidental faults. However, distributed safety- and real-time critical systems have been emerging into more open and interconnected systems, operating autonomously for prolonged times and interfacing with other possibly non-real-time systems. Therefore, the existence of vulnerabilities that adversaries may exploit to compromise system safety cannot be ruled out. In this paper, we discuss potential targeted attacks capable of bypassing TTA's fault-tolerance mechanisms and demonstrate how two well-known recovery techniques - proactive and reactive rejuvenation - can be incorporated into TTA to reduce the window of vulnerability for attacks without introducing extensive and costly changes. [less ▲]

Detailed reference viewed: 36 (1 UL)
See detailForschungsergebnisse und Forschungslücken zu Mehrsprachigkeit in der non-formalen Bildung in Luxemburg
Neumann, Sascha; Kirsch, Claudine UL

Scientific Conference (2022, November 17)

Detailed reference viewed: 51 (0 UL)
Full Text
Peer Reviewed
See detailFantômes et revenants : dispersion, destruction et reconstitution par « traces » du fonds des chirographes échevinaux de Tournai
Mineo, Emilie UL

Scientific Conference (2022, November 17)

Les centaines de milliers de chirographes échevinaux (contrats d’intérêt privé réalisés en multiples exemplaires sur une même feuille de parchemin) de Tournai, déjà amoindris par leur vente ... [more ▼]

Les centaines de milliers de chirographes échevinaux (contrats d’intérêt privé réalisés en multiples exemplaires sur une même feuille de parchemin) de Tournai, déjà amoindris par leur vente partielle au poids en 1820-23, ont été détruits sous les bombes allemandes en 1940. Après avoir reparcouru l’histoire mouvementée de ce fonds documentaire, nous montrerons comment, à partir de différentes sortes de « traces » laissées par les chirographes tournaisiens avant leur disparition et du suivi des migrations des originaux après leur dispersion, il est encore possible d’avoir un aperçu substantiel de la portion médiévale de cette collection, y compris dans certains aspects matériels. Nous insisterons enfin sur des aspects méthodologiques du traitement de ces données dans un logique de constitution d’un corpus, en nous focalisant sur la question de l’estimation quantitative, à partir de témoignages parfois discordants, de la consistance passée du fonds et, partant, de la proportion des pertes [less ▲]

Detailed reference viewed: 24 (0 UL)
See detailThe crucial role of language in mathematical development
Hornung, Caroline UL

Scientific Conference (2022, November 17)

Basic mathematics skills build on nonverbal number sense But these innate non-verbal skills are insufficient to develop symbolic exact number concepts and to learn arithmetic. Language development allows ... [more ▼]

Basic mathematics skills build on nonverbal number sense But these innate non-verbal skills are insufficient to develop symbolic exact number concepts and to learn arithmetic. Language development allows the acquisition of number words and math vocabulary, crucial for developing basic exact number concepts and arithmetic skills. This presentations highlights five key aspects on how language influences mathematical development. First, language is a building block for basic math skills. Second, number naming systems affect number transcoding. Third, multilingual students calculate better in the language in which they have learned numbers. Forth, children's home language influences their mathematics achievement. And finally, the mastery of the language of instruction has a strong impact on mathematics achievement. The implication of these key aspects are discussed with regard to education and instruction in schools. [less ▲]

Detailed reference viewed: 21 (0 UL)
See detailMigration and ageing: The sense of belonging of first-generation Portuguese migrants in Luxembourg
Albert, Isabelle UL

Scientific Conference (2022, November 15)

The need to belong is fundamental to human beings and constitutes a basis for subjective well-being. It is closely linked to further concepts, such as identification, connectedness, attachment, fitting in ... [more ▼]

The need to belong is fundamental to human beings and constitutes a basis for subjective well-being. It is closely linked to further concepts, such as identification, connectedness, attachment, fitting in and feeling “at home”. Migration is a life transition that entails changes in social and emotional belonging. Former social network members might be left behind in the country of origin, and an important developmental task for migrants is therefore the establishment of bonds in the receiving country. As first-generation immigrants of the past decades are now close to retirement age, the question of home and belonging has become particularly pertinent also with regard to their future plans and concerning their intergenerational relations. The present contribution will focus on the sense of belonging of first generation Portuguese immigrants living in Luxembourg by drawing on data from the FNR-funded IRMA study on “Intergenerational Relations in the light of Migration and Ageing”. Selected results with regard to future plans and intergenerational relations will be presented. Further, applying the lens of cultural psychology of semiotic mediation, the development of a sense of belonging will be traced by taking a life span perspective and drawing on concepts such as proculturation and the Trajectory Equifinality Approach. [less ▲]

Detailed reference viewed: 19 (0 UL)
Full Text
Peer Reviewed
See detailTradition - Zukunft - Bedürfnisse. Luxemburgische Blasmusik
Schumacher, Anette UL; Sagrillo, Damien François UL

Scientific Conference (2022, November 12)

Detailed reference viewed: 15 (2 UL)
See detailResilience and well-being of older people in times of crisis and beyond
Albert, Isabelle UL

Scientific Conference (2022, November 11)

Recent times have been characterized by a number of crises which can challenge the quality of life of older people. The Covid-19 pandemic, in particular, has been disruptive for social participation and ... [more ▼]

Recent times have been characterized by a number of crises which can challenge the quality of life of older people. The Covid-19 pandemic, in particular, has been disruptive for social participation and integration. While at the beginning of the pandemic, the sanitary measures were at the foreground and most effort was focused on containing the virus, it became soon clear that secondary effects of social distancing were putting at risk the subjective well-being and mental health of people around the globe. Older people were particularly concerned by social distancing measures as they were regarded a vulnerable group, irrespective of their heterogeneity. Social engagement is a main pillar of successful ageing (Rowe & Kahn, 2015) but opportunities for social activities and connectedness with others have been undermined during the pandemic. Interestingly and contrary to expectations, initial studies have shown that older people fared on average better than feared in the early months of the pandemic as they could draw on resources and resilience built over a life time. However, prolonged times of inactivity and social isolation can take a toll on mental and physical health of those older people who find it difficult to reconnect with others and to participate in social activities. In my talk, I will present findings from the FNR-funded CRISIS project on older people during the pandemic regarding “Correlates of Resilience In the context of Social Isolation in Seniors” as well as from the PAN-VAL project on active ageing in the context of cultural diversity in Luxembourg which was funded by the Ministry of Family and Integration, and I will make reference to the importance of intergenerational relations for the subjective well-being of (older) family members. In light of present and future societal challenges, I will finally discuss how geropsychology can make a contribution to ensure the quality of life of older people. [less ▲]

Detailed reference viewed: 11 (1 UL)
Peer Reviewed
See detailFairness as seen by students - a differentiated look at perceived assessment fairness by 7th and 9th graders in Luxembourg
Sonnleitner, Philipp UL; Inostroza Fernandez, Pamela Isabel UL; Wollschläger, Rachel UL

Scientific Conference (2022, November 10)

Assessment is probably the central factor in every educational biography: On the one hand, through direct consequences for school career decisions, on the other hand, through repercussions on each ... [more ▼]

Assessment is probably the central factor in every educational biography: On the one hand, through direct consequences for school career decisions, on the other hand, through repercussions on each student’s self-concept in the respective subject, for one's own work behavior and the perception of institutional fairness in general. A crucial factor is the subjective, perceived fairness of assessment, which has been shown to influence students' satisfaction, motivation, and attitudes toward learning (Chory-Assad, 2002; Wendorf & Alexander, 2005). The current study examines how Luxembourgish students experience fairness of assessment on the basis of representative samples of the 7iéme (N > 700 students) and 9iéme/ 5iéme (N > 2200, 35% of the total cohort) and gives a first insight into the connection with school interest and self-concept. Special attention is given to the heterogeneity of the Luxembourgish student population: the extent to which language background, socioeconomic status, and gender are related to these perceptions of fairness will be analyzed. Data was collected as part of the nationwide Épreuves standardisées in fall 2021 using the Fairness Barometer (Sonnleitner & Kovacs, 2020) - a standardized instrument to measure informational and procedural fairness in student assessment. The analyses are theoretically based on Classroom Justice Theory and educational psychology (Chory-Assad and Paulsel, 2004; Chory, 2007; Duplaga & Astani, 2010) and utilize latent variable models (SEM) to study the complex interplay between perceived assessment practices and students’ school-related motivational factors. The insights offered by this study are internationally unique in their scope and provide a first glimpse on fairness perceptions of groups of Luxembourgish students in known disadvantaged situations. Results aim to sensitize especially active teachers and educators to the central importance of assessment in schools and offer some concrete advice how to improve it. References: Chory, R. M. (2007). Enhancing student perceptions of fairness: the relationship between instructor credibility and classroom justice. Commun. Educ. 56, 89–105. doi: 10.1080/03634520600994300 Chory-Assad, R. M., and Paulsel, M. L. (2004). Classroom justice: student aggression and resistance as reactions to perceived unfairness. Commun. Educ. 53, 253–273. doi: 10.1080/0363452042000265189 Chory-Assad, R. M. (2002). Classroom justice: perceptions of fairness as a predictor of student motivation, learning, and aggression. Commun. Q. 50, 58–77. doi: 10.1080/01463370209385646 Duplaga, E. A., and Astani, M. (2010). An exploratory study of student perceptions of which classroom policies are fairest. Decision Sci. J. Innov. Educ. 8, 9–33. doi: 10.1111/j.1540-4609.2009.00241.x Sonnleitner, P., & Kovacs, C. (2020, February). Differences between students’ and teachers’ fairness perceptions: Exploring the potential of a self-administered questionnaire to improve teachers’ assessment practices. In Frontiers in Education (Vol. 5, p. 17). Frontiers Media SA. Wendorf, C. A., and Alexander, S. (2005). The influence of individual- and class-level fairness-related perceptions on student satisfaction. Contemp. Educ. Psychol. 30, 190–206. doi: 10.1016/j.cedpsych.2004.07.003 [less ▲]

Detailed reference viewed: 35 (1 UL)
Peer Reviewed
See detailTowards a fairer assessment of cognitive abilities in multilingual children
Kijamet, Dzenita UL; Ugen, Sonja UL

Scientific Conference (2022, November 10)

Detailed reference viewed: 20 (0 UL)
Peer Reviewed
See detailImplementation of a large-scale functional vision screener in early childhood at a national level
Monteiro, Sara UL; Esch, Pascale UL; Hipp, Géraldine UL et al

Scientific Conference (2022, November 10)

Functional vision refers to the way in which an individual uses visual skills and abilities to perform everyday tasks. Limitations on the functional use of vision can interfere with school achievements if ... [more ▼]

Functional vision refers to the way in which an individual uses visual skills and abilities to perform everyday tasks. Limitations on the functional use of vision can interfere with school achievements if left undetected. Early detection is thus key to offer appropriate aids to avoid a negative impact on learning processes. To screen for functional vision impairments at a national level, we developed a set of items measuring visual skills that can be administered in a classroom setting to be included in the yearly school monitoring tests ‘ÉpStan’ in grade 1. Children identified as being at risk will be followed by the Centre pour le Développement des compétences relatives à la Vue (CDV, MENJE). Based on a theoretical model of visual perceptual processing (Humphreys and Riddoch, 1987), we developed 35 items that were pretested. The same first graders (n = 1034) were administered group tests with the newly developed items and existing standardized individual tests (by CDV clinicians). Based on the clinical outcome of the CDV, the items which best predicted functional vision impairments were selected to be implemented in the Luxembourgish school monitoring in grade 1, together with a validated short parent questionnaire (Gorrie et al., 2019). This talk will focus on the development of the screener and on the characteristics of the children with functional vision impairments. [less ▲]

Detailed reference viewed: 18 (2 UL)
Full Text
Peer Reviewed
See detailDevelopment of a test battery to diagnose specific learning disorder in reading in a multilingual education context
Romanovska, Linda UL; Ugen, Sonja UL; Pit-Ten Cate, Ineke UL

Scientific Conference (2022, November 10)

Providing timely and adequate support to children experiencing difficulties in reading and writing is key to minimize the impact on children’s academic achievements, social and emotional well-being ... [more ▼]

Providing timely and adequate support to children experiencing difficulties in reading and writing is key to minimize the impact on children’s academic achievements, social and emotional well-being, particularly for children with specific learning disorders. However, the diagnostic process is especially challenging in Luxembourg’s multilingual educational system with changing instruction languages (Luxembourgish, German, French) and multilingual population. The chosen language of the diagnostic tool is usually identical to the main language of instruction at school, which at time of diagnosis (typically grade 3) is German. This may especially affect the diagnosis of children who do not speak German or Luxembourgish at home as data from the Luxembourgish national school monitoring program reveals significant differences in German reading comprehension in grade 3 depending on the language spoken at home (Hoffmann et al., 2018; Martini et al., 2021). Furthermore, the diagnostic tools currently employed in Luxembourg are developed in countries with primarily one language of instruction, challenging the validity of the diagnostic process in a multilingual population (Ugen et al., 2021). The aim of the current project is to develop a diagnostic tool adapted to the Luxembourgish educational curriculum, that takes children’s potential proficiency differences in the test language into account in the instructions, tasks and resulting norms. This way, over-diagnosis of reading and writing disorders in children who do not speak the main language(s) of instruction at home and underdiagnosis of children who do, can be avoided. The developed test battery assesses children’s performance in key domains relevant for reading and writing comprising phonological skills, (non)word and text reading (fluency and accuracy), reading comprehension, writing, and vocabulary. We will present the pre-test results of 9 sub-tests completed by 214 children, providing the first insights into the test development and validation process.   References Hoffmann, D., Hornung, C., Gamo, S., Esch, P., Keller, U., & Fischbach, A. (2018). Schulische Kompetenzen von Erstklässlern und ihre Entwicklung nach zwei Jahren. In T. Lentz, I. Baumann, & A. Küpper (Eds.), Nationaler Bildungsbericht (pp. 84–96). University of Luxembourg & SCRIPT. Martini, S., Schiltz, C., Fischbach, A., & Ugen, S. (2021). Identifying Math and Reading Difficulties of multilingual children: Effects of different cut-offs and reference group. In M. Herzog, A. Fritz-Stratmann, & E. Gürsoy (Eds.), Diversity Dimensions in Mathematics and Language Learning (pp. 200–228). De Gruyter Mouton. Ugen, S., Schiltz, C., Fischbach, A., & Pit-ten Cate, I. M. (2021). Einleitung: Lernstörungen im multilingualen Kontext – Eine Herausforderung. In Ugen, S., Schiltz, C., Fischbach, A., & Pit-ten Cate, I. M. (Eds.), Lernstörungen im multilingualen Kontext. Diagnose und Hilfestellungen (pp3-7). Luxembourg: Melusina Press. [less ▲]

Detailed reference viewed: 35 (4 UL)
Peer Reviewed
See detailSchool Segregation in Primary and Secondary Education in Luxembourg: Track Placement and Academic Achievement
Pit-Ten Cate, Ineke UL; Hadjar, Andreas UL; Alieva, Aigul et al

Scientific Conference (2022, November 09)

Known as a highly stratified education system with early tracking (similar to Dutch, German, Austrian, and German-speaking Swiss systems), Luxembourg features additional properties that add to its ... [more ▼]

Known as a highly stratified education system with early tracking (similar to Dutch, German, Austrian, and German-speaking Swiss systems), Luxembourg features additional properties that add to its complexity in the educational realm (Backes & Hadjar, 2017). It is a simultaneously multilingual system that also has the largest share of students born outside of Luxembourg or parents born abroad. While most migrants come from within Europe, they frequently come from either a particularly high or low socio-economic background. It has been scientifically established that the educational inequalities in Luxembourg are driven mostly by social origin and immigration/language background. Gender is another critical dimension of disadvantage; for example, boys are less motivated to obtain higher education than girls (Hadjar, Scharf, & Hascher, 2021). In addition, gender often intersects with other factors such as immigrant background in shaping disadvantages. However, evidence shows that – beyond individual background characteristics – schools’ social composition also perpetuates inequalities in student achievement (Martins & Veiga, 2010). Therefore, we focus on the role of school-level segregation on student’s academic outcomes over time using data of a longitudinal cohort from the School Monitoring Programme (Éprueve Standardisée (ÉpStan)) with 5097 students in Grade 3 observed in 2013 and later in Grade 9 observed in 2019 (regular pathways) and 2020 and 2021 (irregular pathways, i.e., class repetitions). School segregation is an aggregate measure of the proportion of students who belong to low socio-economic background and the proportion of students born abroad and/or do not speak instruction language at home. Our contribution aims to provide insights into the following questions: 1. Does school-level segregation in primary education (G3) predict student’s track placement in secondary education? 2. Does school-level segregation in primary education (G3) predict student’s math and German achievement in secondary education (G9)? 3. How strongly are achievement outcomes in G9 correlated with within- and between-track segregation in G9? The findings will serve as a complementary base for tailored policy making with respect to the long-term impact of school composition for teaching and learning, especially within a tracked school system. References Becker, S., & Hadjar, A. (2017). Educational trajectories through secondary education in Luxembourg: How does permeability affect educational inequalities? Schweizerische Zeitschrift Für Bildungswissenschaften, 39(3), 437–460. https://doi.org/10.25656/01:16659 Hadjar, A., Scharf, J., & Hascher, T. (2021). Who aspires to higher education? Axes of inequality, values of education and higher education aspirations in secondary schools in Luxembourg and the Swiss Canton of Bern. European Journal of Education, 56(1), 9–26. https://doi.org/10.1111/ejed.12435 Martins, L., & Veiga, P. (2010). Do inequalities in parents’ education play an important role in PISA students’ mathematics achievement test score disparities? Economics of Education Review, 29(6), 1016–1033. https://doi.org/10.1016/j.econedurev.2010.05.001 [less ▲]

Detailed reference viewed: 68 (10 UL)
Peer Reviewed
See detailTeacher-Student-Relationships and Student Outcomes in Heterogeneous Educational Settings: A Systematic Review of Meta-Analyses
Emslander, Valentin UL; Holzberger, Doris; Fischbach, Antoine UL et al

Scientific Conference (2022, November 09)

Especially in diverse educational settings, positive relationships between students and their teachers can foster students’ learning and help alleviate systematic inequalities. Characterized by emotional ... [more ▼]

Especially in diverse educational settings, positive relationships between students and their teachers can foster students’ learning and help alleviate systematic inequalities. Characterized by emotional warmth or closeness, positive teacher-student relationships (TSR) can improve several student outcomes. For instance, existing meta-analyses suggest significant links between TSR and students’ peer relations, school engagement, academic achievement, emotions, executive functions, general well-being, and reductions in aggressive or disruptive behaviors. However, the evidence on these links is scattered, and a comprehensive overview of the associations with TSR integrating academic, behavioral, socio-emotional, motivational, and general cognitive outcomes is lacking. Furthermore, researchers have been unequivocal about possible moderators, such as how these relationships vary with student age or gender. In light of these research gaps, we systematically reviewed the meta-analytic literature and examined (a) the extent to which academic, behavioral, socio-emotional, motivational, and general cognitive student outcomes are related to TSR in the meta-analytic literature; (b) which moderators influence this association; and (c) the methodological quality of the included meta-analyses. We included meta-analyses with preschool or K-12 samples in our dataset which reported some measure of the relation between TSR and student outcomes. With this dataset, we systematically mapped the evidence on (a) the TSR-outcome relationship; (b) the moderators; and (c) the methodological quality of the meta-analyses. We will present our core findings and discuss future research with this second-order, meta-analytic dataset and the impact of positive TSR in diverse and heterogeneous settings. [less ▲]

Detailed reference viewed: 64 (6 UL)
Peer Reviewed
See detailLie superalgebras of Krichever-Novikov type and their central extensions
Schlichenmaier, Martin UL

Scientific Conference (2022, November 02)

Detailed reference viewed: 16 (0 UL)
Full Text
Peer Reviewed
See detailMO-Gym: A Library of Multi-Objective Reinforcement Learning Environments
Alegre, Lucas Nunes; Felten, Florian UL; Talbi, El-Ghazali UL et al

Scientific Conference (2022, November)

Detailed reference viewed: 120 (40 UL)
Peer Reviewed
See detailValidation and Psychometric Analysis of 32 cognitive item models spanning Grades 1 to 7 in the mathematical domain of numbers & operations
Michels, Michael Andreas UL; Hornung, Caroline UL; Gamo, Sylvie UL et al

Scientific Conference (2022, November)

Today’s educational field has a tremendous hunger for valid and psychometrically sound items to reliably track and model students’ learning processes. Educational large-scale assessments, formative ... [more ▼]

Today’s educational field has a tremendous hunger for valid and psychometrically sound items to reliably track and model students’ learning processes. Educational large-scale assessments, formative classroom assessment, and lately, digital learning platforms require a constant stream of high-quality, and unbiased items. However, traditional development of test items ties up a significant amount of time from subject matter experts, pedagogues and psychometricians and might not be suited anymore to nowadays demands. Salvation is sought in automatic item generation (AIG) which provides the possibility of generating multiple items within a short period of time based on the development of cognitively sound item templates by using algorithms (Gierl & Haladyna, 2013; Gierl et al., 2015). The present study psychometrically analyses 35 cognitive item models that were developed by a team of national subject matter experts and psychometricians and then used for algorithmically producing items for the mathematical domain of numbers & shapes for Grades 1, 3, 5, and 7 of the Luxembourgish school system. Each item model was administered in 6 experimentally varied versions to investigate the impact of a) the context the mathematical problem was presented in, and b) problem characteristics which cognitive psychology identified to influence the problem solving process. Based on samples from Grade 1 (n = 5963), Grade 3 (n = 5527), Grade 5 (n = 5291), and Grade 7 (n = 3018) collected within the annual Épreuves standardisées, this design allows for evaluating whether psychometric characteristics of produced items per model are a) stable, b) can be predicted by problem characteristics, and c) are unbiased towards subgroups of students (known to be disadvantaged in the Luxembourgish school system). After item calibration using the 1-PL model, each cognitive model was analyzed in-depth by descriptive comparisons of resulting IRT parameters, and the estimation of manipulated problem characteristics’ impact on item difficulty by using the linear logistic test model (LLTM, Fischer, 1972). Results are truly promising and show negligible effects of different problem contexts on item difficulty and reasonably stable effects of altered problem characteristics. Thus, the majority of developed cognitive models could be used to generate a huge number of items (> 10.000.000) for the domain of numbers & operations with known psychometric properties without the need for expensive field-trials. We end with discussing lessons learned from item difficulty prediction per model and highlighting differences between the Grades. References: Fischer, G. H. (1973). The linear logistic test model as an instrument in educational research. Acta Psychologica, 36, 359-374. Gierl, M. J., & Haladyna, T. M. (Eds.). (2013). Automatic item generation: Theory and practice. New York, NY: Routledge. Gierl, M. J., Lai, H., Hogan, J., & Matovinovic, D. (2015). A Method for Generating Educational Test Items That Are Aligned to the Common Core State Standards. Journal of Applied Testing Technology, 16(1), 1–18. [less ▲]

Detailed reference viewed: 172 (7 UL)
Peer Reviewed
See detailUsing Diagnostic Classification Models to map first graders’ cognitive development pathways in the Luxembourgish school monitoring program: a pilot study in the domain of numbers & operations
Inostroza Fernandez, Pamela Isabel UL; Michels, Michael Andreas UL; Sonnleitner, Philipp UL

Scientific Conference (2022, November)

Educational large-scale assessments aim to evaluate school systems’ effectiveness by typically looking at aggregated levels of students’ performance. The developed assessment tools or tests are not ... [more ▼]

Educational large-scale assessments aim to evaluate school systems’ effectiveness by typically looking at aggregated levels of students’ performance. The developed assessment tools or tests are not intended or optimized to be used for diagnostic purposes on an individual level. In most cases, the underlying theoretical framework is based on national curricula and therefore too blurry for diagnostic test construction, and test length is too short to draw reliable inferences on individual level. This lack of individual information is often unsatisfying, especially for participating students and teachers who invest a considerable amount of time and effort, not to speak about the tremendous organizational work needed to realize such assessments. The question remains, if the evaluation could not be used in an optimized way to offer more differentiated information on students’ specific skills. The present study explores the potential of Diagnostic Classification Models (DCM) in this regard, since they offer crucial information for policy makers, educators, and students themselves. Instead of a ranking of, e.g., an overall mathematics ability, student mastery profiles of subskills are identified in DCM, providing a rich base for further targeted interventions and instruction (Rupp, Templin & Henson, 2010; von Davier, M., & Lee, Y. S., 2019). A prerequisite for applying such models is well-developed, and cognitively described items that map the assessed ability on a fine-grained level. In the present study, we drew on 104 items that were developed on base of detailed cognitive item models for basic Grade 1 competencies, such as counting, as well as decomposition and addition with low numbers and high numbers (Fuson, 1988, Fritz & Ricken, 2008, Krajewski & Schneider, 2009). Those items were spread over a main test plus 6 different test booklets and administered to a total of 5963 first graders within the Luxembourgish national school monitoring Épreuves standardisées. Results of this pilot study are highly promising, giving information about different student’s behaviors patterns: The final DCM was able to distinguish between different developmental stages in the domain of numbers & operations, on group, as well as on individual level. Whereas roughly 14% of students didn’t master any of the assessed competencies, 34% of students mastered all of them including addition with high numbers. The remaining 52% achieved different stages of competency development, 8% of students are classified only mastering counting, 15% of students also can master addition with low numbers, meanwhile 20% of students additionally can master decomposition, all these patterns reflect developmental models of children’s counting and concept of numbers (Fritz & Ricken, 2008; see also Braeuning et al, 2021). Information that could potentially be used to substantially enhance large-scale assessment feedback and to offer further guidance for teachers on what to focus when teaching. To conclude, the present results make a convincing case that using fine-grained cognitive models for item development and applying DCMs that are able to statistically capture these nuances in student response behavior might be worth the (substantially) increased effort. References: Braeuning, D. et al (2021)., Long-term relevance and interrelation of symbolic and non-symbolic abilities in mathematical-numerical development: Evidence from large-scale assessment data. Cognitive Development, 58, https://doi.org/10.1016/j.cogdev.2021.101008. Fritz, A., & Ricken, G. (2008). Rechenschwäche. utb GmbH. Fuson, K. C. (1988). Children's counting and concepts of number. Springer-Verlag Publishing. Rupp, A. A., Templin, J. L., & Henson, R. A. (2010). Diagnostic measurement: Theory, methods, and applications. New York, NY: Guildford Press. Von Davier, M., & Lee, Y. S. (2019). Handbook of diagnostic classification models. Cham: Springer International Publishing. [less ▲]

Detailed reference viewed: 150 (7 UL)
Peer Reviewed
See detailMaaS modelling: a review of factors, customers’ profiles, choices and business models
Cisterna, Carolina UL; Negarsadat, Madani; Bandiera, Claudia UL et al

Scientific Conference (2022, November)

Mobility-as-a-Service (MaaS) is regarded as one of the emerging solutions to offer integrated, seamless, and flexible multi-modal mobility services as an alternative to privately owned mobility resources ... [more ▼]

Mobility-as-a-Service (MaaS) is regarded as one of the emerging solutions to offer integrated, seamless, and flexible multi-modal mobility services as an alternative to privately owned mobility resources. MaaS gathers collective services such as public transport, shared solutions and other types of new mobility (e.g., on-demand ride services) and ancillary services (e.g., discounted parking) in bundles, accessed via monthly subscriptions. The key distinction between this system and traditional multi-modal systems managed by independent service providers is that payment for services is done through a single digital platform. MaaS is expected to change the way users will choose their modes of transport to reach their daily activities, and how service providers will generate profits, cooperate, and compete. From a wider perspective, MaaS is expected to favour a decline in car ownership and foster sustainable mobility, especially if the services increase the efficiency and utilisation of mass transit. To that aim, it is critical to obtain a thorough grasp of feasible and sustainable business models that suit the diverse needs of customers as well as the diverse and often competing objectives of service providers. In contrast, traditional transportation planning models typically assess solutions in a limited period of time (i.e., the peak hour) and use different simplifying assumptions (e.g., single trip-based choices, no interaction between service providers). This paper aims to provide a general modelling framework relating all main actors in the MaaS ecosystem and identify and discuss all factors that are considered relevant to define customers’ profiles and business models based on a comprehensive review of the literature. Gaps and challenges from the current studies are highlighted and future research directions are recommended. [less ▲]

Detailed reference viewed: 46 (1 UL)
Full Text
Peer Reviewed
See detailAUSLEGUNG eines BIOMECHANISCHEN TESTSTANDES für das BECKEN einschließlich der MUSKELKRÄFTE des GANGZYKLUS
Soliman, Ahmed Abdelsalam Mohamed UL; Ricci, Pierre-Louis; Kedziora, Slawomir UL et al

Scientific Conference (2022, October 28)

Detailed reference viewed: 65 (9 UL)
Peer Reviewed
See detailImpacting the computerization and Digitalization in Luxembourg: the case of teachers and education
Noguera, Carmen UL

Scientific Conference (2022, October 21)

Detailed reference viewed: 15 (2 UL)
See detailSpecial ECREA panel : Rethinking digital sources — making web archives useful for future scholars
Schafer, Valerie UL

Scientific Conference (2022, October 20)

The aim of this panel was to draw attention to the large number of archived web collections, and to rethink the challenges and possibilities that they constitute for studies of past and present mediated ... [more ▼]

The aim of this panel was to draw attention to the large number of archived web collections, and to rethink the challenges and possibilities that they constitute for studies of past and present mediated communication. The point of departure is the international network WARCnet, Web ARChive studies net- work researching web domains and events (warcnet.eu), that is composed of humanities scholars, IT-developers, and web archivists, and that aims at promoting national and transnational research that will help us to understand the history of (trans)national web domains and of transnational events on the web, drawing on the increasingly important digital cultural heritage held in national web archives. [less ▲]

Detailed reference viewed: 32 (2 UL)
Peer Reviewed
See detail“Challenge accepted”. The many sources to catch the history of virality and memes
Schafer, Valerie UL

Scientific Conference (2022, October 20)

Gifs and memes (Kaplan and Nova, 2016), “buzz” on the Web and social networks are inherent to digital cultures since the very first steps of the Web (i.e., Godwin’s Law, Dancing babies, Hamster Dance, cf ... [more ▼]

Gifs and memes (Kaplan and Nova, 2016), “buzz” on the Web and social networks are inherent to digital cultures since the very first steps of the Web (i.e., Godwin’s Law, Dancing babies, Hamster Dance, cf. McGrath, 2019). Virality has developed and changed over time, may it be related to forms (macro images, videos, etc.) and platforms (YouTube, 4Chan, Twitter, TikTok, etc.), audiences, curation and dissemination (with features encouraging spreadability within social platforms), etc., while relying on some patterns that were identified by Shifman (2014), Milner (2018), Jenkins (2009) and others. However, history and diachronic approaches still remain underrepresented in studies of online virality, although Finn Brunton’s Spam, Jason Eppink’s visual history of gifs (2014), or the Memes entry in The Sage Handbook of Web History (McGrath, 2019) can be mentioned. Historicizing virality through times, spaces and platforms is at the heart of the Hivi project at C2DH, University of Luxembourg (https://hivi.uni.lu). While starting to historicize these “Internet phenomena”, may it be Numa Numa Guy, Leave Britney Alone, Grumpy Cat, the Harlem Shake, Distracted Boyfriends, etc., challenges related to sources become more and more obvious: researchers have to deal with ephemerality as well as data overload, with several spaces of heritagization on the live and archived web, with gaps, silences and noises, issues of searchability in web archives, etc. This presentation focused on a case study, the Harlem Shake, to first demonstrate the variety of sources and spaces (physical and digital) that may be used to retrieve and rebuild this phenomenon (i.e., press, audiovisual content, archived web in several institutions, live web and platforms, etc.). It then presented the challenges related to this kind of reconstruction that is also strongly intertwining vernacular and commercial cultures; sound, video, textual contents; local as well as international spaces, etc. [less ▲]

Detailed reference viewed: 53 (0 UL)
See detailPresenter: Testimonies from the Russian Invasion of Ukraine
Venken, Machteld UL

Scientific Conference (2022, October 20)

Detailed reference viewed: 15 (1 UL)
See detailCo-Organiser: Voices from the War – Path to Peace: Ukrainian and International Insights
Venken, Machteld UL

Scientific Conference (2022, October 20)

Detailed reference viewed: 14 (1 UL)
Peer Reviewed
See detail“Small is impactful”. Memes and Politics
Pailler, Fred UL; Schafer, Valerie UL

Scientific Conference (2022, October 20)

From the Hampster Dance and the Dancing Baby in the second half of the 1990s to the hijacking meme of Bernie and his mittens at the US presidential inauguration or the images of the Evergreen blocked in ... [more ▼]

From the Hampster Dance and the Dancing Baby in the second half of the 1990s to the hijacking meme of Bernie and his mittens at the US presidential inauguration or the images of the Evergreen blocked in the Suez Canal, memes have become in the last twenty years an important part of our digital cultures (Shifman, 2014), whose often absurd, playful, corrosive and viral character cannot hide also multiple political dimensions. To the question "Do Memes have politics", to paraphrase Langdon Winner (1980), the answer is undoubtedly yes and this presentation aims to analyse the many levels of politics and agencies at stake when studying memes and their impact, in terms of digital cultures, governance, curation, sharing (John, 2017), appropriation by several communities, but also writing of their history. The first part of the presentation unfolded several levels of politics, starting with the most obvious (memes address political aspects, see for example Denisova, 2019 or Askanius and Keller, 2021) to the more hidden levels (politics of meme generators, of heritagization platform like Know your Meme (Pettis, 2021), of curation …). Relying on a diachronic approach, from the Godwin Law to Distracted Boyfriend, through Leave Britney Alone, this part aimed to address both complementary sides of these Internet phenomena: memes as political forms and politics of memes, while underlying some economic, gendered, affective dimensions which are part of their impact. We then examined the consequences of the notion of “impact” and “politics” for the shaping of an history of memes, which is at stake in the Hivi (A history of online virality) project, we are currently conducting, may it be in terms of sources, methods (“scalable” and “medium” reading), or topics (notably claiming for a study of circulation and flow (Jenkins, 2009), of processes, of participation (Milner, 2018) and appropriation, beyond a sole semiotic approach of memes). References Tina Askanius, Nadine Keller, “Murder fantasies in memes: fascist aesthetics of death threats and the banalization of white supremacist violence”, Information, Communication & Society, 2021, vol. 0, n° 0, p. 1 18. Anastasia Denisova, Internet memes and society: social, cultural, and political contexts, New York, Routledge, 2019. Nicholas A. John, The age of sharing, Cambridge, Polity Press, 2017. Henry Jenkins, If It Doesn’t Spread, It’s Dead (Part One): Media Viruses and Memes, 2009 (http://henryjenkins.org/blog/2009/02/if_it_doesnt_spread_its_dead_p.html). Ryan Milner, The world made meme: Public conversations and participatory media, Cambridge MA, The MIT Press, 2018. Ben Tadayoshi Pettis, “Know your Meme and the Homogeneization of Web History”, Internet Histories, 2021 (to be soon published). Limor Shifman, Memes in digital culture, Cambridge MA, The MIT Press, 2014. Langdon Winner, “Do artifacts have politics ?”, Daedalus, vol. 109, n°1, 1980, p. 121-136. [less ▲]

Detailed reference viewed: 85 (2 UL)
Peer Reviewed
See detailRetrieve me if you can... Women and COVID through Web archives
Schafer, Valerie UL

Scientific Conference (2022, October 18)

The COVID crisis has been a shared worldwide and collective experience from March 2020 and lot of voices have echoed each other, may it be related to grief, lockdown, masks and vaccines, homeschooling ... [more ▼]

The COVID crisis has been a shared worldwide and collective experience from March 2020 and lot of voices have echoed each other, may it be related to grief, lockdown, masks and vaccines, homeschooling, etc. However, this unprecedented crisis has also deepened asymmetries and failures within societies, in terms of occupational fields, economic inequalities, health and sanitary access, and we could extend the inventory of these hidden and more visible gaps that were reinforced during the crisis. Women and gender were also at stake when it came to this sanitary crisis, may it be to discuss the better management of the crisis by female politicians, domestic violence during the lockdown, decreasing production of papers by female research scientists, homeschooling and mental load of women, etc. In December 2021, our AWAC2 team submitted several topics to the IIPC (International Internet Preservation Consortium) community and invited the international organization to select one of them that the team would investigate in depth, based on the unique IIPC Covid collection of web archives. Women, gender and COVID was the winning topic. As a cohort team within the AUT (Archives Unleashed Team) program, the AWAC2 team benefited from a privileged access to this collection, thanks to Archive-It and through ARCH, and from regular mentorship by the AUT team. It allowed us to investigate and analyse this huge collection of 5.3 TB, 161 757 lines for the CSV on domain frequency CSV, 8,738,751 lines for the CSV related to plain text of web pages. Accepting the challenge, the AWAC2 team organized a datathon in March 2022 in Luxembourg to investigate and retrieve the many traces of women, gender and COVID in web archives, while mixing close and distant reading. This panel, chaired by Valérie Schafer, aimed to present this research, entwining technical, epistemological, and methodological issues and challenges with our results. Valérie Schafer began the panel by presenting an overview of the project, including a presentation of the IIPC corpus, of the AUT cohort program and of the research topic. Karin de Wild and Joshgun Sirajzade presented the AUT tools and interfaces, the technical challenges of the corpus, the choices we made (and notably with regards to multilingualism) as well as the tools and methodologies that were used. Finally, Susan Aasman and Sophie Gebeil presented some results and challenges of this research. [less ▲]

Detailed reference viewed: 42 (1 UL)
Peer Reviewed
See detailLet’s talk about web archiving … three institutions, many possibilities
Schafer, Valerie UL

Scientific Conference (2022, October 18)

This presentation focused on three oral interviews I conducted during the COVID crisis, respectively with the BnL (Bibliothèque nationale du Luxembourg, Els, 2020) in Luxembourg and with INA (Institut ... [more ▼]

This presentation focused on three oral interviews I conducted during the COVID crisis, respectively with the BnL (Bibliothèque nationale du Luxembourg, Els, 2020) in Luxembourg and with INA (Institut national de l’audiovisuel, Schafer, 2020b) and BnF (Bibliothèque nationale de France, Gebeil et al., 2020) in France, to document their web archiving practices and choices during the pandemic. Oral histories not only document the collections and often hidden practices of crawling, selecting, curating and preserving data. They also provide a lot of information on living collections, on the challenges at stake and on human participation in this process. It also enlightens values and governance of web archives and web archiving practices (Schafer and Winters, 2021). Moreover, documenting web archiving is necessary for the current and future work of researchers and may help them to better understand their datasets, the representativeness of collections, bias and limits as well as the strengths of these web archives. Our presentation first compared the practices in the three institutions we selected as case studies for this presentation, in terms of perimeters, curation, stakeholders, targets - INA being a specific case as it focused more precisely on Twitter and retrieved data from the Twitter API, while the BnL and BnF targeted websites more widely (and some social networks but in a less systematic way). We also explained how these oral histories may help to better understand the shaping of web archives. We finally gave several concrete examples of the usefulness of this material for researchers who conduct research on web archives, and more specifically on the COVID crisis, in terms of transnational approaches, and silences and noises in web archives (Brügger, 2018), etc. [less ▲]

Detailed reference viewed: 42 (2 UL)
Peer Reviewed
See detailRetrieving traces of the Luxembourg WebSphere through its first websites
Noguera, Carmen UL

Scientific Conference (2022, October 18)

Detailed reference viewed: 18 (1 UL)
See detailKeynote by panel on Looking ahead: after web (archives)?
Noguera, Carmen UL

Scientific Conference (2022, October 18)

Detailed reference viewed: 16 (0 UL)
See detailHistoire des territoires belges annexés au IIIe Reich
Brüll, Christoph UL

Scientific Conference (2022, October 15)

Detailed reference viewed: 33 (3 UL)
Peer Reviewed
See detailOn the (alleged) disappearance of repair since the 1970s
Krebs, Stefan UL

Scientific Conference (2022, October 14)

Detailed reference viewed: 47 (0 UL)
See detailLiteracy mit Kleinkindern mit Erzieher*Innen und Eltern in Kindertagestätten
Kirsch, Claudine UL

Scientific Conference (2022, October 14)

In 2017 führte Luxemburg ein mehrsprachiges Programm in der frühkindlichen Bildung ein: kleine Kinder lernen Luxemburgisch und machen sich mit Französisch vertraut, außerdem werden ihre Familiensprachen ... [more ▼]

In 2017 führte Luxemburg ein mehrsprachiges Programm in der frühkindlichen Bildung ein: kleine Kinder lernen Luxemburgisch und machen sich mit Französisch vertraut, außerdem werden ihre Familiensprachen wertgeschätzt. Literacy Aktivitäten in mehreren Sprachen sowie eine enge Zusammenarbeit mit Eltern sollen dies gewährleisten. Eine Umfrage sowie Beobachtungen im Rahmen des Forschungsprojekts „Zusammenarbeit mit Eltern und Multiliteracies“ (COMPARE) zeigen, dass viele Erzieher*Innen Kindern in mehreren Sprachen vorlesen, dass die Qualität der Interaktionen aber sehr unterschiedlich ist. Eine Umfrage mit Eltern verdeutlicht zudem, dass etwa die Hälfte der Teilnehmer ihren Kindern in der Familiensprachen vorlasen. Dieser Beitrag wird Einblicke in die ersten Ergebnisse der Studie COMPARE geben mit besonderem Fokus auf die Literacy Aktivitäten, die Eltern gemeinsam mit Erzieher*Innen in drei Kindertagesstätten in 2020-2021 durchführten. Wir zeigen, dass die gemeinsamen Aktivitäten mit den Eltern zur Entwicklung von Multiliteracy Praktiken und der Wertschätzung von Familiensprachen führen kann, wenn die Erzieher*Innen ein gutes Verständnis von Literacy haben, in Bildungspartnerschaften investieren und sich Sprachhierarchien bewusst sind. [less ▲]

Detailed reference viewed: 40 (0 UL)
Full Text
Peer Reviewed
See detailNvidia Omniverse for Active Space Debris Removal Missions, an Overview
Li, Xiao UL; Richard, Antoine UL; Loumpasefski, Olga-Orsalia UL et al

Scientific Conference (2022, October 13)

Earth orbits have an increasingly worrying space debris pollution problem caused by millions of human-made objects left in space. These are becoming a hazard for current and future space missions. Many ... [more ▼]

Earth orbits have an increasingly worrying space debris pollution problem caused by millions of human-made objects left in space. These are becoming a hazard for current and future space missions. Many solutions to deal with space debris problems have been proposed, including Active Space Debris Removal (ASDR) methods. In this thriving field, various technologies are under development, among them, systems based on tethers, nets, lasers, or robotic arms can be found. However, testing such systems on earth is challenging, recreating space-like conditions, such as accurate contact dynamics under microgravity, is particularly difficult. Nonetheless, it is of paramount importance to offer testing environments for clean space technologies, as space is unforgiving, and space devices must go through thorough evaluation processes to ensure peak efficiency. The HELEN project aims at fulfilling this very need. Building on one of the most advanced simulation frameworks, it will provide photo-realistic rendering, an accurate physical simulation of the space environment, and eventually, through Hardware-In-the-Loop (HIL), simulation of microgravity in ground facilities. This project is the result of the collaboration between SpaceR (University of Luxembourg), and Spacety (Industry). This simulation will be used to test FlexeS, an ASDR capturing system, which is under development. In HELEN, the accuracy of the physics is particularly important, as FlexeS will be validated through simulated HIL scenarios. Hence, a lifelike depiction of the microgravity environment, as well as the collisions, is critical. Moreover, to intercept and grab the debris FlexeS will rely on computer vision algorithms, thus photo-realistic graphics, allowing for lifelike visualizations are required. Furthermore, for future HIL testing, the ROS bridge and real-time communication capacity are crucial to connect the virtual world with the Zero-G robotic facility of the University of Luxembourg. In such a manner, FlexeS will be visualized in the space surroundings while simultaneously undergoing hardware experiments. With all these constraints in mind, Nvidia's Issac Sim was selected to create on-orbit dynamic scenarios. It not only meets all the requirements above but also provides a variety of sensors. Consequently, HELEN is creating on-orbit simulations featuring a CubeSat embedded with FlexeS, and debris circling the Earth. The scenarios showcase the digital twin of the capturing system intercepting debris, corresponding to the approaching phase in ASDR missions. Visually speaking, the RTX render engine allows for photo-realistic image generation. Regarding the motion of these objects, force-based astrodynamics is implemented into the simulation following the gravitational equation. Faithful velocities, position, and contacts are inferred by Nvidia's physics engine, PhysX. Scaled real-life values are used for the mass, as well as the orbital velocity and altitude. Thus, accurate simulations of contact dynamics between the system and the debris can be achieved. In the future, using a ROS bridge, the simulation will be connected to the HIL testing system of the Zero-G facility, amounting to a wholesome ASDR testing framework. Overall, the realistic simulations created with Isaac Sim are promising for analyzing clean space technologies. They combine photo-realistic scenes, accurate physics, and in the future, a means to test real hardware systems. [less ▲]

Detailed reference viewed: 224 (43 UL)
Full Text
Peer Reviewed
See detailTopology Analysis of the XRP Ledger
Tumas, Vytautas UL; Rivera, Sean UL; Magoni, Damien et al

Scientific Conference (2022, October 12)

XRP Ledger is one of the oldest, well-established blockchains. Despite the popularity of the XRP Ledger, little is known about its underlying peer-to-peer network. The structural properties of a network ... [more ▼]

XRP Ledger is one of the oldest, well-established blockchains. Despite the popularity of the XRP Ledger, little is known about its underlying peer-to-peer network. The structural properties of a network impact its efficiency, security and robustness. We aim to close the knowledge gap by providing a detailed analysis of the XRP overlay network. In this paper we examine the graph-theoretic properties of the XRP Ledger peer-to-peer network and its temporal characteristics. We crawl the XRP Ledger over two months and collect 1,290 unique network snapshots. We uncover a small group of nodes that act as a networking backbone. In addition, we observe a high network churn, with a third of the nodes changing every five days. Our findings have strong implications for the resilience and safety of the XRP Ledger. [less ▲]

Detailed reference viewed: 71 (20 UL)
Full Text
Peer Reviewed
See detailConcept of an Active Debris Removal 2-step capturing system for small satellites in Low Earth Orbit
Hubert Delisle, Maxime UL; Martinez Luna, Carol UL; Yalcin, Baris Can UL et al

Scientific Conference (2022, October 12)

Space debris brings up two main critical issues: not only a non-sustainable space environment for satellite missions, with orbit saturation, but also the creation of an unsafe place for human-related ... [more ▼]

Space debris brings up two main critical issues: not only a non-sustainable space environment for satellite missions, with orbit saturation, but also the creation of an unsafe place for human-related space missions. Despite being extremely challenging, catching autonomously and harmlessly an uncooperative object tumbling at high velocity demand reliability, compliance, and robustness. Grasping an object in microgravity means having control during the impact, but also keeping the link between the chaser satellite and the debris secure enough to handle the deorbiting phase. Supposing that the GNC installed tackles the synchronization with the debris rotation, so that only a linear translation is necessary to capture, three main problems can occur. The first problem can occur at the impact between the servicer and the debris. Due to the motion-reaction law, the debris could be pushed away if the capturing system does not prevent that motion. Besides, a high stiffness of the system, added to an unexpected strong impact, could damage either the servicer and/or the debris, resulting in a mission failure. Moreover, the need for a secure attach is required to go-on with the deorbit phase without losing the debris. That’s why, thanks to the fruitful collaboration between industry and academia (Spacety Luxembourg - SpaceR research group at the University of Luxembourg), a cutting-edge concept of a two-step capturing mechanism is being designed. Data analysis of trackable objects in LEO reveals an abundant number of CubeSat-shaped satellites, that future constellations might also take advantage of. Consequently, the concept presented is focusing on capturing these, at their end of life. A first ‘soft capture’ ensures that the debris is received softly while dampening any vibrations generated. A gecko-inspired adhesive surface will first receive the debris, preventing it from being pushed away. The property of such dry adhesive is that they do not require a high preload to stick to the surface, while having a very strong adhesion. To absorb most of the vibrations or movements due to the first impact, a compliant mechanism will be integrated behind the adhesive part. To that extent, if the alignment is not perfect, the system has some degrees of freedom, so that no damage can be generated. This compliant and sticky system would prevent the first main two issues of capturing an uncooperative target in microgravity. Then, a ‘hard capture’ secures the debris so that it would be deorbited without being released on the way. This part of the system would either gently squeeze the debris, using controlled adhesive flexible arms, or encircle it, and would be designed in compliance of ESA guidelines for demise. A two-step capturing mechanism is here proposed, taking advantage of bio-inspired dry adhesive technology, and compliant mechanisms, while having ESA guidelines in mind. Bringing the advantage of removing a vast range of objects in orbit, it also allows a reliable capturing, removing risks of generating more debris. Later works would bring attention to architecture that would fit more than a box shape. [less ▲]

Detailed reference viewed: 103 (33 UL)
Full Text
Peer Reviewed
See detailRace and gender homophily in collaborations and citations
Kozlowski, Diego UL; Larivière, Vincent; Sugimoto, Cassidy R. et al

Scientific Conference (2022, October 09)

Detailed reference viewed: 167 (5 UL)
Full Text
See detail3D Modelling for AR and 3D printing in Teacher Training
Ulbrich, Eva; El Bedewy, Shereen; Handl, Julia et al

Scientific Conference (2022, October 07)

School activities integrating students’ environments into teaching aim to develop skills and strategies to solve problems in real-world situations and can be useful in hybrid teaching. Such activities can ... [more ▼]

School activities integrating students’ environments into teaching aim to develop skills and strategies to solve problems in real-world situations and can be useful in hybrid teaching. Such activities can encourage and motivate exploring skills in Science, Technology, Engineering, Arts, and Mathematics (STEAM). Hybrid teaching usually uses technologies and connects virtual and physical worlds. We use technologies like 3D modelling for Augmented Reality (AR) or 3D printing with GeoGebra and created an exercise introducing them in a lecture for pre-service mathematics students. The exercise combines the possibility to introduce these technologies, can be used in hybrid teaching and connects to the Austrian mathematics curriculum. The exercise consists of 3D modelling mathematical mazes that can be explored using AR on handheld devices and can also be 3D printed. We used it in online, offline and hybrid scenarios with pre- and in-service teachers and will show resulting presentations of teacher projects. [less ▲]

Detailed reference viewed: 98 (9 UL)
Full Text
See detailPredicting depression in old age: Combining life course data with machine learning
Montorsi, Carlotta UL

Scientific Conference (2022, October 06)

Detailed reference viewed: 24 (0 UL)
Full Text
See detailAugmented Reality in primary education: New learning opportunities for students with learning difficulties in mathematics education
Haas, Ben; Kreis, Yves UL; Lavizcza, Zsolt

Scientific Conference (2022, October 06)

Although there are manifold connections between mathematics, foremost geometry, and the real-world (e.g., architecture, arts, functional objects), integration seldom happens in daily learning lessons in ... [more ▼]

Although there are manifold connections between mathematics, foremost geometry, and the real-world (e.g., architecture, arts, functional objects), integration seldom happens in daily learning lessons in mathematics primary education. Learning three-dimensional geometric shapes, for example, is mainly done in a two-dimensional setting using textbooks instead of three-dimensional settings using technology or didactical material. This circumstance, however, makes it far more difficult for students with learning difficulties in mathematics to understand mathematical properties, recognize shapes in the real world, and understand the possibilities of modulating shapes. Students with learning difficulties learn efficient strategies to apply mathematics to their environment when shapes and connections are visualized with Augmented Reality within the real world. Based on several experiences and studies, we will present and discuss learning mathematics with Augmented Reality in primary education for students with learning difficulties. [less ▲]

Detailed reference viewed: 35 (7 UL)
See detailEtude PAN-VAL: le vieillissement actif dans le contexte de la diversité culturelle au Luxembourg
Albert, Isabelle UL

Scientific Conference (2022, October 05)

Detailed reference viewed: 19 (0 UL)
See detailL'espace frontalier franco-luxembourgeois vu depuis le Luxembourg
Brüll, Christoph UL

Scientific Conference (2022, October 02)

Detailed reference viewed: 56 (4 UL)
Full Text
Peer Reviewed
See detailHybridization of GNSS and 5G Measurement for Assured Positioning, Navigation and Timing
González Garrido, Alejandro UL; Querol, Jorge UL; Chatzinotas, Symeon UL

Scientific Conference (2022, October)

Positioning, Navigation and Timing (PNT) services based on the Global Navigation Satellite System (GNSS) have a number of known drawbacks that makes them prone to suffer a disruption. These flaws can be ... [more ▼]

Positioning, Navigation and Timing (PNT) services based on the Global Navigation Satellite System (GNSS) have a number of known drawbacks that makes them prone to suffer a disruption. These flaws can be exploited to disable this service in critical infrastructures. Therefore, the hybridization of GNSS and 5G measurements enabling Assured PNT (APNT) services is growing up and gaining attention by governmental bodies. 5G signals emitted by terrestrial networks and by Low Earth Orbit (LEO) satellites can complement GNSS enhancing their reliability, security and accuracy. For example, the larger Signal-to-Noise Ratio (SNR) of a terrestrial system makes them more difficult to suffer a jamming attack as compared to GNSS signals. A joint data and positioning signal enhances the security and reliability of the APNT solution with, for example, the successful decoding of encrypted data could be used for system authentication. Moreover, a larger signal bandwidth increases the accuracy of the PNT solution. All of these benefits can be extracted from the 5G terrestrial and non-terrestrial networks that transmit the Positioning Reference Signal (PRS). The rationale for these benefits rely on the flexibility of this pilot signal in terms of bandwidth or symbols used for the APNT service. This paper aims to analyse how this flexibility can be optimized to achieve a specific level of accuracy, minimizing the resources used under certain constrains of bandwidth or latency. The results present the optimal parameters to design a 5G PRS waveform with a target scenario constrains. Then, we compare it with the GNSS service and how to benefit when using them in combination. Finally, the paper concludes with the future research lines proposing a joint communications and positioning system as a feedback or closed loop. In such scenario, the user achieved accuracy is sent back to the infrastructure, and using the dynamic PRS flexibility, the system increases or reduces the PRS resources in order to meet the user accuracy requirements. [less ▲]

Detailed reference viewed: 17 (3 UL)
Full Text
Peer Reviewed
See detailNon-Coherent Massive MIMO Integration in Satellite Communication
Monzon Baeza, Victor UL; Ha, Vu Nguyen UL; Querol, Jorge UL et al

Scientific Conference (2022, October)

Massive Multiple Input-Multiple Output (mMIMO) technique has been considered an efficient standard to improve the transmission rate significantly for the following wireless communication systems, such as ... [more ▼]

Massive Multiple Input-Multiple Output (mMIMO) technique has been considered an efficient standard to improve the transmission rate significantly for the following wireless communication systems, such as 5G and beyond. However, implementing this technology has been facing a critical issue of acquiring much channel state information. Primarily, this problem becomes more criticising in the integrated satellite and terrestrial networks (3GPP-Release 15) due to the countable high transmission delay. To deal with this challenging problem, the mMIMO-empowered non-coherent technique can be a promising solution. To our best knowledge, this paper is the first work considering employing the non-coherent mMIMO in satellite communication systems. This work aims to analyse the challenges and opportunities emerging with this integration. Moreover, we identified the issues in this conjunction. The preliminary results presented in this work show that the performance measured in bit error rate (BER) and the number of antennas are not far from that required for terrestrial links. Furthermore, thanks to mMIMO in conjunction with the non-coherent approach, we can work in a low signal-to-noise ratio (SNR) regime, which is an excellent advantage for satellite links. [less ▲]

Detailed reference viewed: 76 (16 UL)
See detailChildren’s perspectives on their learning experiences during the pandemic
Kirsch, Claudine UL

Scientific Conference (2022, October)

Detailed reference viewed: 29 (2 UL)
Full Text
See detailVARIABILITY-DRIVEN DESIGN CONFIGURATOR OF SPACE SYSTEMS TO SUPPORT DECISION-MAKERS
Rana, Loveneesh UL; Lazreg, Sami UL; Bohlachov, Vladyslav et al

Scientific Conference (2022, October)

Detailed reference viewed: 33 (0 UL)
Full Text
Peer Reviewed
See detailClimate Risk and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2022, October)

Detailed reference viewed: 6 (1 UL)
Full Text
Peer Reviewed
See detailEnabling Elements of Simulations Digital Twins and its Applicability for Information Superiority in Defence Domain
Aggarwal, Kapish; Bögel, Elias; La Rosa Betancourt, Manuel et al

Scientific Conference (2022, September 29)

The emerging concept of digital twins is the key enabler for modelling and simulations needs of any future-ready entity. Digital twins enable rapid transformation of requirements into capabilities at much ... [more ▼]

The emerging concept of digital twins is the key enabler for modelling and simulations needs of any future-ready entity. Digital twins enable rapid transformation of requirements into capabilities at much lower costs, compared to conventional methods, through enhancement of modularity and scalability. Elements of a modelling and simulations digital twin are discussed in this paper. These capabilities include, but are not limited to, surrogate modelling, optimization, parallelization, high performance computing, cloud architecture design, etc. These concepts are relevant for the integration of modelling and simulations technologies into a single interface digital twin for rapid prototyping and qualification of engineering systems. Use of these emerging technologies leads to significantly less simulation computation time (reduced from hours/days to seconds or even micro-seconds) compared to the conventional methods. Ease-of-collaboration with all stakeholders, reduced testing time, minimal on-site infrastructure requirements are the key cost-reducing advantages found in this study. Applicability of such intelligent and online digital twins for information superiority to enhance cybersecurity and on-board threat assessment of space-based (defence) services is analysed. The use of these synchronized and interoperable capabilities mitigates both reversible and non-reversible physical and cyber threats to defence space infrastructure. [less ▲]

Detailed reference viewed: 102 (17 UL)