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See detailNeed for Cognition and its relation to academic achievement in different learning environments
Colling, Joanne UL; Wollschläger, Rachel UL; Keller, Ulrich UL et al

in Learning and Individual Differences (2022), 93

The present study investigates how Need for Cognition (NFC), an individual's tendency to engage in and enjoy thinking, relates to academic achievement in 9th grade students (N = 3.355) attending different ... [more ▼]

The present study investigates how Need for Cognition (NFC), an individual's tendency to engage in and enjoy thinking, relates to academic achievement in 9th grade students (N = 3.355) attending different school tracks to understand whether school track moderates this relation when controlling for student background variables. Using structural regression analyses, our findings revealed small and significant positive relations between NFC and academic achievement in German, French and Math. Relations were strongest in the highest and weakest in the lowest track. No significant track difference between the highest and the intermediary track could be identified; significant differences of small effect size between the intermediary and the lowest track were found in favor of the intermediary track in the relation between NFC and academic achievement in German and Math. These findings underpin the importance of NFC in academic settings, while highlighting that the relation between NFC and achievement varies with the characteristics of different learning environments. [less ▲]

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See detailLeveraging stretching directions for stationkeeping in Earth-Moon halo orbits
Muralidharan, Vivek UL; Howell, Kathleen C.

in Advances in Space Research (2022), 69(1), 620-646

Near Rectilinear Halo Orbits (NRHOs) are stable or nearly stable orbits that are defined as part of the L1 and L2 halo orbit families in the circular restricted three-body problem. Within the Earth-Moon ... [more ▼]

Near Rectilinear Halo Orbits (NRHOs) are stable or nearly stable orbits that are defined as part of the L1 and L2 halo orbit families in the circular restricted three-body problem. Within the Earth-Moon regime, the L1 and L2 NRHOs are proposed as long horizon trajectories for cislunar exploration missions, including NASA’s upcoming Gateway mission. The spacecraft, however, incurs continuous deviations due to unmodeled forces and orbit determination errors in this dynamically sensitive region. The current investigation focuses on an impulsive stationkeeping technique to maintain the spacecraft near a virtual reference orbit despite these uncertainties. The flow dynamics in the region are utilized to identify appropriate maneuver and target locations. The investigation reflects the impact of various factors on maneuver cost and efficacy. For orbits where position and velocity states are particularly sensitive to epoch time, an additional feedback control strategy is applied for phasing constraints. [less ▲]

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See detailRepresentaciones (ficticias) de un pequeño medio literario: el caso de la literatura luxemburguesa
Glesener, Jeanne UL

in Theory Now: journal of literature, critique, and thought (2022), 5(1), 77-96

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See detailComparison of high-performance and conventional internal insulation materials based on hygrothermal analysis using in situ measurements and simulation
Latz, Sebastian UL; Maas, Stefan UL; Scholzen, Frank UL et al

in Bauphysik (2022), 1

Following the European directive to reduce CO2 emissions of existing buildings by improving energy efficiency, internal insulation systems play a central role in the renovation of historically valuable ... [more ▼]

Following the European directive to reduce CO2 emissions of existing buildings by improving energy efficiency, internal insulation systems play a central role in the renovation of historically valuable buildings which cannot be insulated from the outside for reasons of monumental protection, or in cases where no additional exterior space is available. However, besides the thermal property of insulation systems, there are other relevant properties to be considered before choosing an internal insulation system, such as the hygrothermal behavior which plays a particularly important role in diffusion-open interior insulation systems. As the internal insulation layer reduces the temperature of the existing wall during the heating season, its drying potential after rain events is considerably reduced. In addition to the effects of moisture from the outside (mainly wind driven rain), the entry of humidity from the inside through diffusion plays an important role. In the presented study, high performance insulation materials with nanostructure based on silicon dioxide and polyurethane are compared to conventional material based on wood fiber from a hygrothermal point of view by analyzing in situ measurements and simulations. [less ▲]

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See detailThe Green Stock Market Bubble
Lehnert, Thorsten UL

Scientific Conference (2022, January)

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See detailRevealing defect-induced spin disorder in nanocrystalline
Bersweiler, Mathias UL

Scientific Conference (2022, January)

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See detailThe Myth of Beirut’s Resilience: Introduction to the Thematic Issue
Buccianti-Barakat, Liliane; Hesse, Markus UL

in Urban Planning (2022), 7(1), 82-86

This editorial introduces a thematic issue of Urban Planning on recent developments in Beirut, Lebanon. It emphasises the multiple crises the city has been undergoing for some time, which include an ... [more ▼]

This editorial introduces a thematic issue of Urban Planning on recent developments in Beirut, Lebanon. It emphasises the multiple crises the city has been undergoing for some time, which include an enduring political and economic crisis, the impact of the Covid‐19 pandemic, and most recently the devastating impact of the blast that happened in the port of Beirut on 4th August 2020. The editorial outlines the specific challenges resulting from these crises and addresses the concept of resilience, which is taken up by the articles included in this issue. [less ▲]

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See detailIst individuelle Diagnostik im Schulmonitoring möglich? Neue Methoden versprechen einen diagnostischen Mehrwert der Épreuves Standardisées
Sonnleitner, Philipp UL

in Georges, Carrie; Hoffmann, Danielle; Hornung, Caroline (Eds.) et al LEARN Newsletter - Editioun 2022 (2022)

Das durch den Fonds National de la Recherche (FNR) geförderte Forschungsprojekt FAIR-ITEMS (C19/SC/13650128) am Luxembourg Centre for Educational Testing (LUCET, lucet.uni.lu) Untersucht aktuell ... [more ▼]

Das durch den Fonds National de la Recherche (FNR) geförderte Forschungsprojekt FAIR-ITEMS (C19/SC/13650128) am Luxembourg Centre for Educational Testing (LUCET, lucet.uni.lu) Untersucht aktuell, inwieweit die ÉpStan im Bereich Mathematik zusätzliche diagnostische Informationen über die SchülerInnen liefern könnten. Da die Tests dabei mehr leisten sollen, wird zusätzliche Expertise bei der Erstellung, als auch bei der Auswertung mithilfe neuester psychometrischer Methoden angewandt. [less ▲]

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See detailIntroduction to Smart Cities in Transition: Challenges of Participation in Urban Environments
Papangelis, Konstantinos; Saker; Leork, Dale et al

in International Journal of Human-Computer Interaction (2022)

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See detailOpinion Statement ECJ-TF 2/2021 on the ECJ Decision of 25 February 2021 in Société Générale (Case C-403/19) on the Calculation of the Maximum Amount of a Foreign Direct Tax Credit
Kofler, Georg; Garcia Prats, Alfredo; Haslehner, Werner UL et al

in European Taxation (2022)

The Court’s decision in Société Générale reinforces established case law that EU law neither prohibits juridical double taxation nor does it impose an obligation on the residence Member State to prevent ... [more ▼]

The Court’s decision in Société Générale reinforces established case law that EU law neither prohibits juridical double taxation nor does it impose an obligation on the residence Member State to prevent the disadvantages that could arise from the exercise of competence thus attributed by the two Member States. The parallel existence of taxing jurisdiction, however, must be distinguished from the exercise of such jurisdiction by each Member State. While Member States are free to determine the connecting factors for the allocation of taxing jurisdiction in tax treaties, in exercising the “power of taxation, so allocated by bilateral conventions for the avoidance of double taxation, the Member States must comply with EU rules and, more particularly, observe the principle of equal treatment”. It is generally accepted in the Court’s case law that both the ordinary credit and exemption (including exemption with progression) methods are permissible to avoid double taxation. In Société Générale, this position was confirmed, specifically as regards the “maximum deduction” under the ordinary credit method in tax treaties, even though this treatment can result in a disadvantage for cross-border income as compared with domestic income. As the disadvantage in Société Générale was due to the difference between gross-basis taxation of dividends in the source Member States (Italy, the Netherlands and the United Kingdom) and net-basis taxation of those foreign-sourced dividends in the residence state (France), it remains to be seen whether or not future cases will bring clarity in light of the Seabrokers decision of the EFTA Court, which examined how expenses can be lawfully allocated to foreign income from the perspective of the residence Member State. [less ▲]

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See detailThe Irreversible Pollution Game
Boucekkine, Raouf; Ruan, Weihua; Zou, Benteng UL

E-print/Working paper (2022)

We study a 2-country differential game with irreversible pollution. Irresability is of a hard type: above a certain threshold level of pollution, the self-cleaning capacity of Nature drops to zero ... [more ▼]

We study a 2-country differential game with irreversible pollution. Irresability is of a hard type: above a certain threshold level of pollution, the self-cleaning capacity of Nature drops to zero. Accordingly, the game includes a non-concave feature, and we characterize both the cooperative and non-cooperative versions with this general non-LQ property. We deliver full analytical results for the existence of Markov Perfect Equilibria. We first demonstrate that when pollution costs are equal across players (symmetry), irreversible pollution regimes are more frequently reached than under cooperation. Second, we study the implications of asymmetry in the pollution cost. We find far nontrivial results on the reachability of the irreversible regime. However, we unambiguously prove that, for the same total cost of pollution, provided the irreversible regime is reached in both the symmetric and asymmetric cases, long-term pollution is larger in the symmetric case, reflecting more intensive free-riding under symmetry. [less ▲]

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See detail"Le chant de la sirène d'une Europe recalibrée"
Roelens, Nathalie UL

Conference given outside the academic context (2022)

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See detailBreaking and Fixing Vote Privacy of the Estonian E-Voting Protocol IVXV
Mueller, Johannes UL

in Workshop on Advances in Secure Electronic Voting 2022 (2022)

We revisit the e-voting protocol IVXV that is used for legally-binding political elections in Estonia from a privacy perspective. We demonstrate that IVXV is vulnerable to attacks against vote privacy in ... [more ▼]

We revisit the e-voting protocol IVXV that is used for legally-binding political elections in Estonia from a privacy perspective. We demonstrate that IVXV is vulnerable to attacks against vote privacy in those threat scenarios that were considered for IVXV originally. We explain how to improve IVXV so that it protects against the privacy issues we discovered. [less ▲]

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See detailDiscovering pesticides and their TPs in Luxembourg waters using open cheminformatics approaches
Krier, Jessy; Singh, Randolph R.; Kondic, Todor UL et al

in Environment International (2022), 158

The diversity of hundreds of thousands of potential organic pollutants and the lack of (publicly available) information about many of them is a huge challenge for environmental sciences, engineering, and ... [more ▼]

The diversity of hundreds of thousands of potential organic pollutants and the lack of (publicly available) information about many of them is a huge challenge for environmental sciences, engineering, and regulation. Suspect screening based on high-resolution liquid chromatography-mass spectrometry (LC-HRMS) has enormous potential to help characterize the presence of these chemicals in our environment, enabling the detection of known and newly emerging pollutants, as well as their potential transformation products (TPs). Here, suspect list creation (focusing on pesticides relevant for Luxembourg, incorporating data sources in 4 languages) was coupled to an automated retrieval of related TPs from PubChem based on high confidence suspect hits, to screen for pesticides and their TPs in Luxembourgish river samples. A computational workflow was established to combine LC-HRMS analysis and pre-screening of the suspects (including automated quality control steps), with spectral annotation to determine which pesticides and, in a second step, their related TPs may be present in the samples. The data analysis with Shinyscreen (https://gitlab.lcsb.uni.lu/eci/shinyscreen/), an open source software developed in house, coupled with custom-made scripts, revealed the presence of 162 potential pesticide masses and 96 potential TP masses in the samples. Further identification of these mass matches was performed using the open source approach MetFrag (https://msbi.ipb-halle.de/MetFrag/). Eventual target analysis of 36 suspects resulted in 31 pesticides and TPs confirmed at Level-1 (highest confidence), and five pesticides and TPs not confirmed due to different retention times. Spatio-temporal analysis of the results showed that TPs and pesticides followed similar trends, with a maximum number of potential detections in July. The highest detections were in the rivers Alzette and Mess and the lowest in the Sûre and Eisch. This study (a) added pesticides, classification information and related TPs into the open domain, (b) developed automated open source retrieval methods - both enhancing FAIRness (Findability, Accessibility, Interoperability and Reusability) of the data and methods; and (c) will directly support “L’Administration de la Gestion de l’Eau” on further monitoring steps in Luxembourg. [less ▲]

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See detailPhysics-Based Cognitive Radar Modeling and Parameter Estimation
Sedighi, Saeid UL; Mysore Rama Rao, Bhavani Shankar UL; Mishra, Kumar Vijay et al

in IEEE Radar Conference (2022)

We consider the problem of channel response estimation in cognitive fully adaptive radar (CoFAR). We show that this problem can be expressed as a constrained channel estimation problem exploiting the ... [more ▼]

We consider the problem of channel response estimation in cognitive fully adaptive radar (CoFAR). We show that this problem can be expressed as a constrained channel estimation problem exploiting the similarity between the channel impulse responses (CIRs) of the adjacent channels. We develop a constrained CIR estimation (CCIRE) algorithm enhancing estimation performance compared to the unconstrained CIR estimation where the similarity between the CIRs of the adjacent channels is not employed. Further, we we derive the Cram\'{e}r-Rao bound (CRB) for the CCIRE and show the optimality of the proposed CCIRE through comparing its performance with the derived CRB. [less ▲]

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See detailPerspective luxembourgeoise: Conclusions sur le caractère inclusif des supports pédagogiques
Andersen, Katja Natalie UL; Vogt, Michaela; Bagger, Anette et al

in Forum für Politik, Gesellschaft und Kultur in Luxemburg (2022), 423

Cette contribution s’appuie sur les conclusions du projet European Comparison of Inclusive Teaching Materials (ITM) lancé en 2018. Cette collaboration regroupant l’Allemagne (Prof. Dr. M. Vogt, C ... [more ▼]

Cette contribution s’appuie sur les conclusions du projet European Comparison of Inclusive Teaching Materials (ITM) lancé en 2018. Cette collaboration regroupant l’Allemagne (Prof. Dr. M. Vogt, C. Bierschwale), le Luxembourg (Prof. Dr. K. Andersen), la Suède (Prof. Dr. A. Bagger) et l’Italie (Prof. Dr. V. Macchia, Prof. Dr. A. Augschöll, A. Ardemagni) cherche un moyen de définir le caractère inclusif des supports pédagogiques. C’est dans cette perspective qu’a été développé un catalogue de critères permettant d’évaluer la pertinence des supports pédagogiques en vue de leur utilisation dans des contextes d’enseignement inclusif. La présente contribution présente ces critères en les mettant en parallèle avec les conclusions des recherches menées au Luxembourg. [less ▲]

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See detailIntegral Attacks on Pyjamask-96 and Round-Reduced Pyjamask-128
Cui, Jiamin; Hu, Kai; Wang, Qingju UL et al

in Topics in Cryptology - CT-RSA 2022 - The Cryptographers' Track at the RSA Conference 2022, San Francisco, CA, USA, February 7-10, 2022, Proceedings (2022)

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See detailPrivacy-preserving Copy Number Variation Analysis with Homomorphic Encryption
Demirci, Huseyin UL; Lenzini, Gabriele UL

Scientific Conference (2022)

Innovative pharma-genomics and personalized medicine services are now possible thanks to the availability for processing and analysis of a large amount of genomic data. Operating on such databases, is ... [more ▼]

Innovative pharma-genomics and personalized medicine services are now possible thanks to the availability for processing and analysis of a large amount of genomic data. Operating on such databases, is possible to test for predisposition to diseases by searching for genomic variants on whole genomes as well as on exomes, which are collections of protein coding regions called exons. Genomic data are therefore shared amongst research institutes, public/private operators, and third parties, creating issues of privacy, ethics, and data protection because genome data are strictly personal and identifying. To prevent damages that could follow a data breach—a likely threat nowadays—and to be compliant with current data protection regulations, genomic data files should be encrypted, and the data processing algorithms should be privacy-preserving. Such a migration is not always feasible: not all operations can be implemented straightforwardly to be privacypreserving; a privacy-preserving version of an algorithm may not be as accurate for the purpose of biomedical analysis as the original; or the privacy-preserving version may not scale up when applied to genomic data processing because of inefficiency in computation time. In this work, we demonstrate that at least for a wellknown genomic data procedure for the analysis of copy number variants called copy number variations (CNV) a privacy-preserving analysis is possible and feasible. Our algorithm relies on Homomorphic Encryption, a cryptographic technique to perform calculations directly on the encrypted data. We test our implementation for performance and reliability, giving evidence that it is practical to study copy number variations and preserve genomic data privacy. Our proof-of-concept application successfully and efficiently searches for a patient’s somatic copy number variation changes by comparing the patient gene coverage in the whole exome with a healthy control exome coverage. Since all the genomics data are securely encrypted, the data remain protected even if they are transmitted or shared via an insecure environment like a public cloud. Being this the first study for privacy-preserving copy number variation analysis, we demonstrate the potential of recent Homomorphic Encryption tools in genomic applications. [less ▲]

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See detailLa qualité pour agir dans l’intérêt collectif
Menetrey, Séverine UL

in Revue Critique de Jurisprudence Belge (2022)

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See detailOn the sociopolitical and institutional production of digital cities
Carr, Constance UL

Presentation (2022)

Detailed reference viewed: 27 (4 UL)