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See detailGeoGebraTAO: Geometry Learning using a Dynamic Adaptive ICT-Enhanced Environment to Promote Strong Differentiation of Children’s Individual Pathways
Dording, Carole UL

Doctoral thesis (2020)

In our project, we investigate the scientific validity of a specific self-built Adaptive Learning Tool in the field of dynamic geometry with a focus on the individual learning pathways of a highly diverse ... [more ▼]

In our project, we investigate the scientific validity of a specific self-built Adaptive Learning Tool in the field of dynamic geometry with a focus on the individual learning pathways of a highly diverse student population. A total of 164 children in Luxembourgish elementary schools, aged between 10 and 13 years, acted as the test group and explored elementary geometric concepts in a sequence of learning assignments created with GeoGebra, a dynamic mathematics system which is integrated into the computer-assisted testing framework TAO. They actively built new knowledge in an autonomous way and at their own pace with only minor support interventions by their teacher. Based on easily exploitable data collected within a sequence of exploratory learning assignments, the GEOGEBRATAO tool analyses the answers provided by the child and performs a diagnostic of the child’s competencies in geometry. With respect to this outcome, the tool manages to identify children struggling with geometry concepts and subsequently proposes a differentiated individual pathway through scaffolding and feedback practices. The children can voluntarily watch short video clips aimed to help them better understand any task that they might have difficulty with. A spaced repetition feature is another highly useful component of the tool. Pre- and post-test results show that the test group (working with the GEOGEBRATAO tool) and a parallel working control group (following a traditional paper-and-pencil geometry course), increased their geometry skills and knowledge through the training program, with the test group performing even better in items related to dynamic geometry. In addition, a more precise analysis within clusters based on similar performances in both pre- and post-tests and the child’s progress within the GEOGEBRATAO activities, provides evidence of some common ways of working with our educational technology tool, leading to overall improvement at an individualized level. [less ▲]

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See detailInternational Law and the European Court of Justice: The Politics of Avoiding History
Erpelding, Michel UL

in Journal of the History of International Law (2020, October 21), 22(2-3), 446-472

Using the example of the European Court of Justice (ECJ), this article addresses the lack of historical contextualization which is prevalent in most general accounts of EU law and EU institutions. It ... [more ▼]

Using the example of the European Court of Justice (ECJ), this article addresses the lack of historical contextualization which is prevalent in most general accounts of EU law and EU institutions. It argues that this narrative is the result of a tradition established by the founders of the discipline. For these early ‘Euro-lawyers’, distinguishing the practice of European institutions from earlier international institutions had important political implications. This was especially true with regard to the ECJ. By providing a selective and partly decontextualized narrative of this court and describing it as largely unprecedented in international law, early Euro-lawyers were not only able to bolster the ‘supranational’ and ‘sui generis’ character of their nascent discipline. They were also able to avoid comparisons between the ECJ and prior international courts and tribunals whose similarly wide-ranging powers and integrated nature had been considered as politically problematic. [less ▲]

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See detailLa Public History à Esch
Cauvin, Thomas UL

Scientific Conference (2020, October 09)

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See detailUnderstanding Alpha Decay
Penasse, Julien UL

Presentation (2020, October 06)

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See detailSine-skewed toroidal distributions and their application in protein bioinformatics
Ley, Christophe UL; Ameijeiras-Alonso, Jose

in Biostatistics (2020)

In the bioinformatics field, there has been a growing interest in modeling dihedral angles of amino acids by viewing them as data on the torus. This has motivated, over the past years, new proposals of ... [more ▼]

In the bioinformatics field, there has been a growing interest in modeling dihedral angles of amino acids by viewing them as data on the torus. This has motivated, over the past years, new proposals of distributions on the torus. The main drawback of most of these models is that the related densities are (pointwise) symmetric, despite the fact that the data usually present asymmetric patterns. This motivates the need to find a new way of constructing asymmetric toroidal distributions starting from a symmetric distribution. We tackle this problem in this article by introducing the sine-skewed toroidal distributions. The general properties of the new models are derived. Based on the initial symmetric model, explicit expressions for the shape and dependence measures are obtained, a simple algorithm for generating random numbers is provided, and asymptotic results for the maximum likelihood estimators are established. An important feature of our construction is that no extra normalizing constant needs to be calculated, leading to more flexible distributions without increasing the complexity of the models. The benefit of employing these new sine-skewed toroidal distributions is shown on the basis of protein data, where, in general, the new models outperform their symmetric antecedents. [less ▲]

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See detailScience Meets Sports: When Statistics Are More Than Numbers
Ley, Christophe UL; Dominicy, Yves

Book published by Cambridge Scholars Publishing (2020)

This book presents the field of sports statistics to two very distinct target audiences, namely academicians, in order to raise their interest in this growing field, and, on the other hand, sports fans ... [more ▼]

This book presents the field of sports statistics to two very distinct target audiences, namely academicians, in order to raise their interest in this growing field, and, on the other hand, sports fans, who, even without advanced mathematical knowledge, will be able to understand the data analysis and gain new insights into their favourite sports. The book thus offers a unique perspective on this attractive topic by combining sports analytics, data visualisation and advanced statistical procedures to extract new findings from sports data such as improved rankings or prediction methods. Bringing together insights from football, tennis, basketball, track and field, and baseball, the book will appeal to aficionados of any sport, and, thanks to its cutting-edge data analysis tools, will provide the reader with completely new insights into their favourite sport in an engaging and user-friendly way. [less ▲]

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See detailHigh-Throughput Elliptic Curve Cryptography Using AVX2 Vector Instructions
Cheng, Hao UL; Groszschädl, Johann UL; Tian, Jiaqi UL et al

in Dunkelman, Orr; Jacobson Jr., Michael J.; O'Flynn, Colin (Eds.) Selected Areas in Cryptography, 27th International Conference, Halifax, NS, Canada (Virtual Event), October 21-23, 2020, Revised Selected Papers (2020, October)

Single Instruction Multiple Data (SIMD) execution engines like Intel’s Advanced Vector Extensions 2 (AVX2) offer a great potential to accelerate elliptic curve cryptography compared to implementations ... [more ▼]

Single Instruction Multiple Data (SIMD) execution engines like Intel’s Advanced Vector Extensions 2 (AVX2) offer a great potential to accelerate elliptic curve cryptography compared to implementations using only basic x64 instructions. All existing AVX2 implementations of scalar multiplication on e.g. Curve25519 (and alternative curves) are optimized for low latency. We argue in this paper that many real-world applications, such as server-side SSL/TLS handshake processing, would benefit more from throughput-optimized implementations than latency-optimized ones. To support this argument, we introduce a throughput-optimized AVX2 implementation of variable-base scalar multiplication on Curve25519 and fixed-base scalar multiplication on Ed25519. Both implementations perform four scalar multiplications in parallel, where each uses a 64-bit element of a 256-bit vector. The field arithmetic is based on a radix-2^29 representation of the field elements, which makes it possible to carry out four parallel multiplications modulo a multiple of p=2^255−19 in just 88 cycles on a Skylake CPU. Four variable-base scalar multiplications on Curve25519 require less than 250,000 Skylake cycles, which translates to a throughput of 32,318 scalar multiplications per second at a clock frequency of 2 GHz. For comparison, the to-date best latency-optimized AVX2 implementation has a throughput of some 21,000 scalar multiplications per second on the same Skylake CPU. [less ▲]

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See detailLike a Phoenix from the Ashes of Insolvency: An Appraisal of the Rescue Culture of the Kenyan Insolvency Act of 2015
Lichuma, Caroline Omari UL; Shako, Florence

in East African Community, Law Journal (2020), 1(1), 33-50

Caroline Lichuma and Florence Shako posit that the goal of any modern insolvency regime is to salvage financially viable companies or to provide individuals in financial distress with breathing room ... [more ▼]

Caroline Lichuma and Florence Shako posit that the goal of any modern insolvency regime is to salvage financially viable companies or to provide individuals in financial distress with breathing room without or before subjecting them to the liquidation or bankruptcy processes. The application of the Insolvency Act 2015 and the accompanying Insolvency Regulations of 2016, they note, is bound to have a more than positive change in the Kenyan insolvency regime. In that context, the rescue procedures should be adequately utilized in order to ensure a lasting change in the administration of the insolvency regime in Kenya. It is hoped that there will be no need to be ‘rescued from rescue’ procedures as a result of misuse or abuse of these mechanisms. They convey optimistsm that under the aegis of this fortified rescue culture, many deserving debtors in Kenya, especially companies worth saving, will live on to trade and enrich the country. [less ▲]

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See detailFlexibility in Problem Solving: Analogical Transfer of Tool Use in Toddlers Is Immune to Delay
Bobrowicz, Katarzyna UL; Lindström, Felicia; Lindblom Lovén, Marcus et al

in Frontiers in Psychology (2020)

Solving problems that are perceptually dissimilar but require similar solutions is a key skill in everyday life. In adults, this ability, termed analogical transfer, draws on memories of relevant past ... [more ▼]

Solving problems that are perceptually dissimilar but require similar solutions is a key skill in everyday life. In adults, this ability, termed analogical transfer, draws on memories of relevant past experiences that partially overlap with the present task at hand. Thanks to this support from long-term memory, analogical transfer allows remarkable behavioral flexibility beyond immediate situations. However, little is known about the interaction between long-term memory and analogical transfer in development as, to date, they have been studied separately. Here, for the first time, effects of age and memory on analogical transfer were investigated in 2-to-4.5-olds in a simple tool-use setup. Children attempted to solve a puzzle box after training the correct solution on a different looking box, either right before the test or 24 hours earlier. We found that children (N = 105) could transfer the solution regardless of the delay and a perceptual conflict introduced in the tool set. For children who failed to transfer (N = 54) and repeated the test without a perceptual conflict, the odds of success did not improve. Our findings suggest that training promoted the detection of functional similarities between boxes and, thereby, flexible transfer both in the short and the long term. [less ▲]

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See detailRequiem for a dream: perceived economic conditions and subjective well-being in times of prosperity and economic crisis
Fernandez Urbano, Roger UL; Kulic, Nevena

in Social Indicators Research (2020), 151

Using the Panel of Social Inequalities in Catalonia, Spain (PaD 2001–2012), this article investigates the relationship between perceptions of economic conditions and subjective well-being in times of ... [more ▼]

Using the Panel of Social Inequalities in Catalonia, Spain (PaD 2001–2012), this article investigates the relationship between perceptions of economic conditions and subjective well-being in times of prosperity and economic crisis. It also analyses how this relation- ship plays out across different social backgrounds. Periods of economic crisis and prosper- ity serve as a proxy for objective macroeconomic conditions. The Spanish region of Cata- lonia is a relevant setting because it faced one of the highest increases in inequality and unemployment in Europe as a result of the 2008 Economic Crisis. Our results show that perceived economic conditions matter beyond objective micro and macroeconomic realm and become a strong determinant of subjective well-being during a crisis, particularly for the middle class. However, contrary to our initial expectations, our results also show the existence of a close correlation between perceptions of economic conditions and subjective well-being for low social background individuals in times of economic prosperity, and an even stronger relationship in times of economic crisis. The article stipulates several poten- tial explanations for these results. [less ▲]

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See detailChapitres sur le droit européen et comparé de la consommation
Poillot, Elise UL

in Fenouillet, Dominique (Ed.) Dalloz Action - Droit de la consommation (2020)

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See detailMemory suppression and its deficiency in psychological disorders: A focused meta-analysis
Stramaccia, Davide F.; Meyer, Ann-Kristin; Rischer, Katharina Miriam UL et al

in Journal of Experimental Psychology. General (2020)

It is still debated whether suppressing the retrieval of unwanted memories causes forgetting and whether this constitutes a beneficial mechanism. To shed light on these 2 questions, we scrutinize the ... [more ▼]

It is still debated whether suppressing the retrieval of unwanted memories causes forgetting and whether this constitutes a beneficial mechanism. To shed light on these 2 questions, we scrutinize the evidence for such suppression-induced forgetting (SIF) and examine whether it is deficient in psychological disorders characterized by intrusive thoughts. Specifically, we performed a focused meta-analysis of studies that have used the think/no-think procedure to test SIF in individuals either affected by psychological disorders or exhibiting high scores on related traits. Overall, across 96 effects from 25 studies, we found that avoiding retrieval leads to significant forgetting in healthy individuals, with a small to moderate effect size (0.28, 95% CI [0.14, 0.43]). Importantly, this effect was indeed larger than for more anxious (−0.21, 95% CI [−0.41, −0.02]) or depressed individuals (0.05, 95% CI [−0.19, 0.29])—though estimates for the healthy may be inflated by publication bias. In contrast, individuals with a stronger repressive coping style showed greater SIF (0.42, 95% CI [0.32, 0.52]). Furthermore, moderator analyses revealed that SIF varied with the exact suppression mechanism that participants were instructed to engage. For healthy individuals, the effect sizes were considerably larger when instructions induced specific mechanisms of direct retrieval suppression or thought substitution than when they were unspecific. These results suggest that intact suppression-induced forgetting is a hallmark of psychological well-being, and that inducing more specific suppression mechanisms fosters voluntary forgetting. [less ▲]

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See detailMuseen der Großregion
Helfer, Malte UL

in Heimatfabrik Lokalmuseum (2020)

Carte interactive des musées de la Wallonie et du Luxembourg

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See detailNumerical Assessment of two Implants for Pubic Ramus Fracture of human Pelvis applying Normal Gait loading
Ricci, Pierre-Louis; Gerich, Torsten; Kelm, Jens et al

Poster (2020, October)

Fractures of the anterior pelvic ring reduce patients` mobility and independence and increase mortality. Pelvic instability impairs the load transfer to the lower extremity. Restoring stability has ... [more ▼]

Fractures of the anterior pelvic ring reduce patients` mobility and independence and increase mortality. Pelvic instability impairs the load transfer to the lower extremity. Restoring stability has therefore been a crucial point of research. Most of the reported studies refer to loading on one leg stand without consideration of physiological muscle and contact-joint forces of the common vital daily movements. Our present study considers physiological gait loading of all acting muscles and Hip Joint Contact (HJC) forces of the pelvis. Those muscles and HJC forces were calculated by inverse dynamics for normal gait motion data and applied in Finite Element Analyses (FEA). The biomechanical stability provided to the anterior pelvic ring by two reconstructive techniques was investigated numerically: the iliopubic Subcutaneous Plate (SP) and the Supra-Acetabular External Fixator (SAFE). Numerical biomechanical assessment of two reconstructive devices for pubic ramus fracture. All muscles and HJC forces of normal gait were calculated by means of inverse dynamics software for a healthy patient considering a musculoskeletal model previously validated experimentally. The Finite Element (FE) model was developed for a pelvis with and without superior and/or inferior rami fractures. Furthermore, two FE models for SP and SAFE mounted on the rami fractured pelvis were designed considering fixation bearing at the lumbosacral joint. The calculated forces were implemented on the FE models following the anatomical orientation and attachments/insertions of each muscle. During the two moments of the gait with higher stresses: Left Heel Strike (LHS) and Right Toe-Off (RTO), strains and displacements were recorded and investigated at the fracture location in addition to the implant fixation points. Considering only right superior ramus fracture during LHS and RTO, recorded strains and displacements for both implants showed similar results. However, during RTO, the SAFE showed a slight reduction of strains at the posterior location by 6% compared to SP. When including both superior and inferior right ramus fractures, both devices did not show considerable difference in recorded strains. However, there were significant differences in the displacements between fracture extremities. The SP technique reduced these motions for both LHS and RTO by 40% compared to the gold standard SAFE technique. In cases of superior ramus fracture only, displacements for both reconstructive devices were similar due to the remaining stability provided by the intact inferior ramus. Both devices reduced stresses of the sacrum wing in LHS and RTO with slightly better results for SAFE. In case of superior and inferior pubic ramus fractures, the SP technique reduced the frontal opening of the fractured right pubic bone. The SAFE did not provide any improvements compared to the SP technique. [less ▲]

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See detailLaboratory Tests of ATSC M/H Commercial Receivers Performance on SFN Networks
Matias, Jose Maria; Ortiz Gomez, Flor de Guadalupe UL; Hernandez, Mario et al

in IEEE Latin America Transactions (2020), 18(10),

The Single Frequency Networks (SFN) are widely used in Digital Television transmission networks due to the high spectral efficiency achieved by them. Digital modulation techniques with a cyclic prefix ... [more ▼]

The Single Frequency Networks (SFN) are widely used in Digital Television transmission networks due to the high spectral efficiency achieved by them. Digital modulation techniques with a cyclic prefix, like OFDM (Orthogonal Frequency Division Multiplex) are adequate to define and use SFN networks due to their ability to deal with the artificial multipath produced in a SFN network. Nevertheless, the ATSC 1.0 and ATSC M/H standards use the VSB-8 modulation technique, which has no cyclic prefix, so it is very sensitive to multipath. The ATSC 1.0 standard has been recently implemented in Mexico, so the ATSC M/H standard can be used in the next years because it is compatible with ATSC 1.0, meanwhile ATSC 3.0, the newest standard of ATSC, it is not compatible.The performance of the reception with VSB-8 modulation depends strongly on the receiver channel equalizer. For this reason, the objective of this study is to analyze the performance of ATSC M/H commercial receivers in SFN networks. The results of this study will help in the implementation of SFN networks in Mexico and other countries that use ATSC 1.0 and ATSC M/H. [less ▲]

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See detailIndirizzi di saluto
Cauvin, Thomas UL

Scientific Conference (2020, September 27)

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See detailCompounding forms of inequality: Cape Verdean migrants' struggles in education and beyond in Luxembourg
Tavares, Bernardino UL

in European Journal of Applied Linguistics (2020), 8(2), 307-332

This paper seeks to show how language, combined with other social variables, exacerbates migrants’ and their descendants’ struggles at school and beyond in Luxembourg. To a certain extent, the official ... [more ▼]

This paper seeks to show how language, combined with other social variables, exacerbates migrants’ and their descendants’ struggles at school and beyond in Luxembourg. To a certain extent, the official trilingualism of Luxembourg – French, German and Luxembourgish – corresponds to an ‘elite multilingualism’ (Garrido 2017; Barakos and Selleck 2018) which defines who can access certain resources, e. g. education, work etc., and who can be left playing catch-up. The latter are those migrants who I here conceive as multilinguals on the margins. The elitist system is a form of domination and power over those whose language repertoire is less valued. Migrants’ disadvantage is further impacted by other indicators of their identity that can go beyond their educational qualifications and language repertoire per se, such as their country of origin, ethnicity, race, gender, citizenship etc. Language intersects with other forms of disadvantage or privileges. From an ethnographic sociolinguistic perspective, drawing on interviews and participant observations, this paper will illustrate this intersection of language, race and ethnicity, and struggles from the ground-level educational realities and aspirations of Cape Verdean migrants and their descendants in Luxembourg. This helps cast light on the social organisation in Luxembourg and understand the effects of multilingualism in creating ‘abyssal lines’ (Santos 2007) between the nationals, certain European migrants, Lusophone and African migrants in terms of social and economic mobility. [less ▲]

Detailed reference viewed: 36 (2 UL)