References of "Scientific congresses, symposiums and conference proceedings"
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See detailA Methodology for Handling Data Movements by Anticipation: Position Paper
Bleuse, Raphaël UL; Lucarelli, Giorgio; Trystram, Denis

in Euro-Par 2018 Workshops (in press)

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on ... [more ▼]

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on different nodes of the system. The management of such a huge communication demand is crucial for reaching the best possible performance of the system. Meanwhile, we have to deal with more interferences as the trend is to use a single all-purpose interconnection network whatever the interconnect (tree-based hierarchies or topology-based heterarchies). There are two different types of communications, namely, the flows induced by data exchanges during the computations, and the flows related to Input/Output operations. We propose in this paper a general model for interference-aware scheduling, where explicit communications are replaced by external topological constraints. Specifically, the interferences of both communication types are reduced by adding geometric constraints on the allocation of tasks into machines. The proposed constraints reduce implicitly the data movements by restricting the set of possible allocations for each task. This methodology has been proved to be efficient in a recent study for a restricted interconnection network (a line/ring of processors which is an intermediate between a tree and higher dimensions grids/torus). The obtained results illustrated well the difficulty of the problem even on simple topologies, but also provided a pragmatic greedy solution, which was assessed to be efficient by simulations. We are currently extending this solution for more complex topologies. This work is a position paper which describes the methodology, it does not focus on the solving part. [less ▲]

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See detailL’exposition d’objets ou de collections de « marque » : cobranding, réécriture, réénonciation
Schall, Céline UL

in Laval, Sylvie (Ed.) Marques muséales : un espace public revisité ? (in press)

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités  ... [more ▼]

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités ? Quels effets peut avoir cette démarche sur la communication ou sur l’exposition ? Notamment, le musée d’accueil s’approprie-t-il simplement l’imaginaire et les valeurs de la marque invitée par un phénomène de « transfert » ? Pour répondre à ces questions, nous étudions trois expositions qui reprennent des objets ou collections de musées dont la marque est internationalement reconnue. L’analyse sémiotique des images de marque du musée d’accueil et du musée invité ainsi que l’analyse sémiopragmatique des expositions montrent l’impact de la présence d’une grande marque internationale sur l’exposition et réciproquement, l’impact de l’exposition sur l’image de marque du musée d’accueil. Plus qu’un simple cobranding, c’est une réécriture impliquant une réénonciation du discours et des valeurs portés par les marques qui est proposée à travers ces expositions. Le processus aboutit à la création de nouveaux espaces symboliques et d’expositions réflexives, avec plusieurs niveaux de lecture. [less ▲]

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See detailLe quotidien d’un poilu de la première guerre mondiale sur Facebook : nouvelle forme de médiation, nouvelle expérience ?
Schall, Céline UL; Vilatte, Jean-Christophe

in Les mondes de la médiation culturelle (in press)

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une ... [more ▼]

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une forme de médiation a priori inédite pour un musée français. Elle présente l’histoire d’un personnage de fiction, Léon Vivien, qui raconte son quotidien lors de la première guerre mondiale, sur Facebook, comme si ce réseau social avait existé à cette époque. Cette contribution met en évidence certains des effets de sens de la page par une analyse sémiotique du dispositif et une analyse thématique de ses contenus. Nous questionnons ensuite cette « nouvelle » forme de médiation qui se dit « participante » et qui, en réalité, reste assez classique dans son contenu et sous-exploite le potentiel de Facebook. » [less ▲]

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See detail« … Eripuit servus mihi vitam » - Représentations médiatiques de la violence et de la criminalité dans les provinces occidentales de l'Empire romain
Binsfeld, Andrea UL

in Amodio, Mara (Ed.) The imagery of violence in Roman society (I-VI cent.). Persistence, innovations and interrelations from the Roman to the Christian Empire (in press)

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See detailA New Perspective on the Luxembourgish Genitive
Döhmer, Caroline UL

in Germanic Genitives (in press)

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See detailLe dialogue entre les juges en matière de protection des droits de l'homme
Pelin Raducu, Ioana UL

in Menetrey, Séverine; Hess, Burkhard (Eds.) Les dialogues des juges en Europe (in press)

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard ... [more ▼]

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard propre de l’UE en matière des droits de l’homme. Cette tendance de la C.J.U.E. contredira le prescrit normatif découlant du « dialogue des juges » d’interprétation conforme à la jurisprudence de la C.E.D.H. avant que l’adhésion de l’UE à la Convention E.D.H. ne soit formellement acquise. [less ▲]

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See detailLes archevêques de Milan face aux premières expériences seigneuriales: stratégies et positionnements (milieu XIIIe-début XIVe s.)
Salemme, Timothy UL

in Barralis, Christine (Ed.) L’évêque face à son métier. Actes du colloque international, Metz. 15-17 novembre 2017 (in press)

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See detailConservazione e ricezione dei documenti pontifici in Italia settentrionale: il caso del monastero cistercense di Chiaravalle Milanese (secoli XII-XVI)
Salemme, Timothy UL

in Salemme, Timothy; Renault, Jean-Baptiste (Eds.) Conservation et réception des documents pontificaux par les Ordres religieux (XIe-XVe siècles). Actes du colloque international. Nancy, 12-13 décembre 2013 (in press)

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See detailBlockchain Governance: An Overview and Prediction of Optimal Strategies Using Nash Equilibrium
Khan, Nida UL; Ahmad, Tabrez; Patel, Anass et al

in 3rd AUE International Research Conference (in press)

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this ... [more ▼]

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this nascent technology. In this paper, the position of blockchain governance within the hierarchy of Institutional governance is discussed. Blockchain governance is analyzed from the perspective of IT governance using Nash equilibrium to predict the outcome of different governance decisions. A payoff matrix for blockchain governance is created and simulation of different strategy profiles is accomplished for computation of all Nash equilibria. We also create payoff matrices for different kinds of blockchain governance, which were used to propose novel mathematical formulae usable to predict the best governance strategy that minimizes the occurrence of a hard fork as well as predicts the behavior of the majority during protocol updates. [less ▲]

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See detailDiscrete-Phase Sequence Design with Stopband and PSL Constraints for Cognitive Radar
Alaeekerahroodi, Mohammad UL; Kumar, Sumit UL; Mysore Rama Rao, Bhavani Shankar UL et al

in Proceedings of EuRAD 2020 (in press)

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or ... [more ▼]

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or communications. We use the coordinate descent framework and propose an algorithm to design discrete-phase sequences with spectral power suppressed in arbitrary bands and with low auto-correlation sidelobes in terms of PSL. Our proposed algorithm exploits fast Fourier transform and is, therefore, computationally efficient. The over-the-air experiments using implementation on software-defined radio show reasonable agreement with numerical simulations and feasibility for field-deployment [less ▲]

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See detailVon Objekt- und Meta-Ebenen: Analyse der Softwareanforderungen computergestützter juristischer Entscheidungen
Adrian, Axel; Rapp, Max; Steen, Alexander UL

in Recht DIGITAL – 25 Jahre IRIS, Proceedings of the International Legal Informatics Symposium (IRIS 2022) (in press)

Die Interpretation und Anwendung von Gesetzestexten auf einem konkreten Lebenssachverhalt erfordert von menschlichen Experten ein hohes Maß an Wissen, Erfahrung und die Fähigkeit zahlreiche kontextuelle ... [more ▼]

Die Interpretation und Anwendung von Gesetzestexten auf einem konkreten Lebenssachverhalt erfordert von menschlichen Experten ein hohes Maß an Wissen, Erfahrung und die Fähigkeit zahlreiche kontextuelle Überlegungen anzustellen. Die Formalisierung und Automatisierung solch eines Prozesses in einem computergestützten Verfahren muss dies entsprechend reflektieren. Ausgehend von einer Fallstudie werden in dieser Arbeit erforderliche juridische Schritte der Rechtsanwendung identifiziert und verschiedenen Objekt- und Meta-Ebenen zugeordnet. Diese Zuordnung erlaubt eine abstrakte Analyse von Softwareanforderungen, die juristische Assistenzsysteme erfüllen müssen, um bei juristischen Fallentscheidungen unterstützen zu können. [less ▲]

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See detailEnergy performance comparison of ventilation-based heating versus water-based heating systems in an efficient residential building
Shirani, Arsalan UL; Merzkirch, Alexander; Leyer, Stephan UL et al

in Fluid Dynamics & Material Processing (in press)

The application of air-based heating systems as a possible approach to reduce the construction costs in highly efficient residential buildings is becoming popular. Air-based heating systems have been well ... [more ▼]

The application of air-based heating systems as a possible approach to reduce the construction costs in highly efficient residential buildings is becoming popular. Air-based heating systems have been well-known for their usage in passive houses during the past three decades. Available studies on such systems tend mostly to focus only on comparing exhaust air heat pump technology with conventional systems in efficient buildings. Moreover, most of the existing studies ignore the usual presence of the electrical heaters as backup. Besides, a comprehensive study and comparison between different air-based heating system concepts is still missing. In this study, four different air-based heating system concepts separated by the type of heat source of heat pump for heating and domestic hot water are defined. These systems are compared to four conventional heating system, including floor heating and direct electrical system employing dynamic annual simulations. According to simulation results, the systems with floor heating have shown the best system efficiencies and the lowest energy demand in comparison to the other systems. The main reason for this was the lower supply temperatures of the floor heating systems. Between the air heating systems, the system equipped with an outdoor air heat pump showed a better energy performance than an exhaust air system. The main reason for this could be attributed to the power limitation of exhaust air heat pump systems. [less ▲]

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See detailAn (Un)Necessary Evil - Users’ (Un)Certainty about Smartphone App Permissions and Implications for Privacy Engineering
Bongard, Kerstin UL; Sterckx, Jean-Louis; Rossi, Arianna UL et al

in 2022 7th IEEE European Symposium on Security and Privacy Workshops (EuroSPW) (in press)

App permission requests are a control mechanism meant to help users oversee and safeguard access to data and resources on their smartphones. To decide whether to accept or deny such requests and make this ... [more ▼]

App permission requests are a control mechanism meant to help users oversee and safeguard access to data and resources on their smartphones. To decide whether to accept or deny such requests and make this consent valid, users need to understand the underlying reasons and judge the relevance of disclosing data in line with their own use of an app. This study investigates people’s certainty about app permission requests via an online survey with 400 representative participants of the UK population. The results demonstrate that users are uncertain about the necessity of granting app permissions for about half of the tested permission requests. This implies substantial privacy risks, which are discussed in the paper, resulting in a call for user-protecting interventions by privacy engineers. [less ▲]

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See detailLessons from Investment Treaty Arbitration
Garcia Olmedo, Javier UL

in Haslehner, Werner; Rust, Alexander; Kofler (Eds.) Alternative Dispute Resolution in Taxation (in press)

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See detailCOREQQA: A COmpliance REQuirements Understanding using Question Answering Tool
Abualhaija, Sallam UL; Arora, Chetan; Briand, Lionel UL

in The ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE) (in press)

We introduce COREQQA, a tool for assisting requirements engineers in acquiring a better understanding of compliance requirements by means of automated Question Answering. Extracting compliance-related ... [more ▼]

We introduce COREQQA, a tool for assisting requirements engineers in acquiring a better understanding of compliance requirements by means of automated Question Answering. Extracting compliance-related requirements by manually navigating through a legal document is both time-consuming and error-prone. COREQQA enables requirements engineers to pose questions in natural language about a compliance-related topic given some legal document, e.g., asking about data breach. The tool then automatically navigates through the legal document and returns to the requirements engineer a list of text passages containing the possible answers to the input question. For better readability, the tool also highlights the likely answers in these passages. The engineer can then use this output for specifying compliance requirements. COREQQA is developed using advanced large-scale language models from BERT’s family. COREQQA has been evaluated on four legal documents. The results of this evaluation are briefly presented in the paper. The tool is publicly available on Zenodo (https://doi.org/10.5281/zenodo.6653514). [less ▲]

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See detailWikiDoMiner: Wikipedia Domain-Specific Miner
Ezzini, Saad UL; Abualhaija, Sallam UL; Sabetzadeh, Mehrdad

in The ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE) (in press)

We introduce WikiDoMiner -- a tool for automatically generating domain-specific corpora by crawling Wikipedia. WikiDoMiner helps requirements engineers create an external knowledge resource that is ... [more ▼]

We introduce WikiDoMiner -- a tool for automatically generating domain-specific corpora by crawling Wikipedia. WikiDoMiner helps requirements engineers create an external knowledge resource that is specific to the underlying domain of a given requirements specification (RS). Being able to build such a resource is important since domain-specific datasets are scarce. WikiDoMiner generates a corpus by first extracting a set of domain-specific keywords from a given RS, and then querying Wikipedia for these keywords. The output of WikiDoMiner is a set of Wikipedia articles relevant to the domain of the input RS. Mining Wikipedia for domain-specific knowledge can be beneficial for multiple requirements engineering tasks, e.g., ambiguity handling, requirements classification, and question answering. WikiDoMiner is publicly available on Zenodo under an open-source license (https://doi.org/10.5281/zenodo.6672682) [less ▲]

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See detailTAPHSIR: Towards AnaPHoric Ambiguity Detection and ReSolution In Requirements
Ezzini, Saad UL; Abualhaija, Sallam UL; Arora, Chetan et al

in The ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE) (in press)

We introduce TAPHSIR -- a tool for anaphoric ambiguity detection and anaphora resolution in requirements. TAPHSIR facilities reviewing the use of pronouns in a requirements specification and revising ... [more ▼]

We introduce TAPHSIR -- a tool for anaphoric ambiguity detection and anaphora resolution in requirements. TAPHSIR facilities reviewing the use of pronouns in a requirements specification and revising those pronouns that can lead to misunderstandings during the development process. To this end, TAPHSIR detects the requirements which have potential anaphoric ambiguity and further attempts interpreting anaphora occurrences automatically. TAPHSIR employs a hybrid solution composed of an ambiguity detection solution based on machine learning and an anaphora resolution solution based on a variant of the BERT language model. Given a requirements specification, TAPHSIR decides for each pronoun occurrence in the specification whether the pronoun is ambiguous or unambiguous, and further provides an automatic interpretation for the pronoun. The output generated by TAPHSIR can be easily reviewed and validated by requirements engineers. TAPHSIR is publicly available on Zenodo (https://doi.org/10.5281/zenodo.5902117). [less ▲]

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See detailTerminal-Aware Multi-Connectivity Scheduler for Uplink Multi-Layer Non-Terrestrial Networks
Dazhi, Michael UL; Al-Hraishawi, Hayder UL; Mysore Rama Rao, Bhavani Shankar UL et al

in IEEE Global Communications Conference (Globecom), Rio de Janeiro 4 - 8 December 2022 (in press)

This paper introduces the concept of multi-connectivity (MC) to the multi-orbit non-terrestrial networks (NTNs), where user terminals can be served by more than one satellite to achieve higher peak ... [more ▼]

This paper introduces the concept of multi-connectivity (MC) to the multi-orbit non-terrestrial networks (NTNs), where user terminals can be served by more than one satellite to achieve higher peak throughput. MC is a technique initially introduced by the 3rd Generation Partnership Project (3GPP) for terrestrial communications in 4G and 5G, it has shown much gain in the terrestrial domain and this paper explores areas where this concept can benefit the satellite domain. MC can increase throughput, but this entails increased power consumption at user terminal for uplink transmissions. The energy efficiency of uplink communications can be improved by designing efficient scheduling schemes, and to this end, we developed a terminal aware multi-connectivity scheduling algorithm. This proposed algorithm uses the available radio resources and propagation information to intelligently define a dynamic resource allocation pattern, that optimally routes traffic so as to maximize uplink data rate while minimizing the energy consumption at the UT. The algorithm operates with the terminal differentiating multi-layer NTN resource scheduling architecture, which has a softwarized dispatcher at the network layer that classifies and differentiates the packets based on terminal type. The performance of the proposed algorithm was compared with round robin and joint carrier schedulers in terms of uplink data rate and energy efficiency. We also provide architectural design of implementable schedulers for multi-orbital satellite networks that can operate with different classes of terminals. [less ▲]

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See detailRegional heterogeneity and individual characteristics in the development of a European tax policy: historical insights from Luxembourg
Danescu, Elena UL

in Danescu, Elena; Dima, Alina Mihaela (Eds.) Fostering recovery through metaverse business modelling - An interdisciplinary analysis of the new paradigm shift (2023, March)

Luxembourg is currently one of the most politically stable, consensus-oriented, and prosperous countries in the world, characterised by am advanced social market economy, and a level of material wellbeing ... [more ▼]

Luxembourg is currently one of the most politically stable, consensus-oriented, and prosperous countries in the world, characterised by am advanced social market economy, and a level of material wellbeing above the EU average. Its strong fiscal position is well illustrated by a longstanding AAA credit rating, a significant accumulation of government financial assets, and a distinct fiscal approach. In this light, this paper aims to investigate the specific features of the tax system in Luxembourg from a multidisciplinary perspective by analysing historical sources and exploring the development of these particularities over time, their impact on the socioeconomic context and their repercussions for the European integration process, especially in the design and completion of Economic and Monetary Union (EMU). [less ▲]

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See detailSoK: Secure E-Voting with Everlasting Privacy
Haines, Thomas; Mueller, Johannes UL; Mosaheb, Rafieh UL et al

in Proceedings on Privacy Enhancing Technologies (PoPETs) (2023)

Vote privacy is a fundamental right, which needs to be protected not only during an election, or for a limited time afterwards, but for the foreseeable future. Numerous electronic voting (e-voting ... [more ▼]

Vote privacy is a fundamental right, which needs to be protected not only during an election, or for a limited time afterwards, but for the foreseeable future. Numerous electronic voting (e-voting) protocols have been proposed to address this challenge, striving for everlasting privacy. This property guarantees that even computationally unbounded adversaries cannot break privacy of past elections. The broad interest in secure e-voting with everlasting privacy has spawned a large variety of protocols over the last three decades. These protocols differ in many aspects, in particular the precise security properties they aim for, the threat scenarios they consider, and the privacy-preserving techniques they employ. Unfortunately, these differences are often opaque, making analysis and comparison cumbersome. In order to overcome this non-transparent state of affairs, we systematically analyze all e-voting protocols designed to provide everlasting privacy. First, we illustrate the relations and dependencies between all these different protocols. Next, we analyze in depth which protocols do provide secure and efficient approaches to e-voting with everlasting privacy under realistic assumptions, and which ones do not. Eventually, based on our extensive and detailed treatment, we identify which research problems in this field have already been solved, and which ones are still open. Altogether, our work offers a well-founded reference point for conducting research on secure e-voting with everlasting privacy as well as for future-proofing privacy in real-world electronic elections. [less ▲]

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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 ▲]

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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)

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See detailPower Allocation for Space-Terrestrial Cooperation Systems with Statistical CSI
Chien, Trinh-Van; Lagunas, Eva UL; Hoang, Tiep M. et al

in IEEE Global Communications Conference (IEEE Globecom), Rio de Janeiro, Brazil, Dec. 2022 (2022, December)

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See detailCoexistence of eMBB and URLLC in Open Radio Access Networks: A Distributed Learning Framework
Al-Senwi, Madyan Abdullah Othman UL; Lagunas, Eva UL; Chatzinotas, Symeon UL

in IEEE Global Communications Conference (IEEE Globecom), Rio de Janeiro, Brazil, Dec. 2022 (2022, December)

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See detailSecurity Modeling and Analysis of Moving Target Defense in Software Defined Networks
Rodrigues de Mendonça Neto, Júlio UL; Kim, Minjune; Graczyk, Rafal UL et al

in Security Modeling and Analysis of Moving Target Defense in Software Defined Networks (2022, November 28)

The use of traditional defense mechanisms or intrusion detection systems presents a disadvantage for defenders against attackers since these mechanisms are essentially reactive. Moving target defense (MTD ... [more ▼]

The use of traditional defense mechanisms or intrusion detection systems presents a disadvantage for defenders against attackers since these mechanisms are essentially reactive. Moving target defense (MTD) has emerged as a proactive defense mechanism to reduce this disadvantage by randomly and continuously changing the attack surface of a system to confuse attackers. Although significant progress has been made recently in analyzing the security effectiveness of MTD mechanisms, critical gaps still exist, especially in maximizing security levels and estimating network reconfiguration speed for given attack power. In this paper, we propose a set of Petri Net models and use them to perform a comprehensive evaluation regarding key security metrics of Software-Defined Network (SDNs) based systems adopting a time-based MTD mechanism. We evaluate two use-case scenarios considering two different types of attacks to demonstrate the feasibility and applicability of our models. Our analyses showed that a time-based MTD mechanism could reduce the attackers’ speed by at least 78% compared to a system without MTD. Also, in the best-case scenario, it can reduce the attack success probability by about ten times. [less ▲]

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See detailEconomic Ideas and Political Action in Shaping Economic and Monetary Union: Pierre Werner and Luxembourg
Danescu, Elena UL

in Danescu, Elena; Dima, Alina (Eds.) Fostering recovery through metaverse business modelling - An interdisciplinary analysis of the new paradigm shift (2022, November 19)

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the ... [more ▼]

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the establishment of Community institutions and European funding institutions in the country. As Luxembourg was in a currency union with Belgium within the Belgium-Luxembourg Economic Union and did not have its own Central Bank, these developments were all the more meaningful. When the European integration process experienced a series of major crises – including the failure of the European Defence Community and European Political Community in 1954, the empty chair crisis in 1966 and General de Gaulle’s veto on British accession in 1962 and 1967 –, Luxembourg set out on the path of European monetary integration, under the impetus of Finance Minister and Prime Minister Pierre Werner. In October 1970, the Werner Report provided a detailed blueprint for Economic and Monetary Union and laid the foundations for the euro. The Luxembourg financial centre would serve as a “laboratory” for the future single currency. This paper makes extensive use of relevant European and international archives and original interviews, adopting an interdisciplinary approach to analyse Luxembourg’s leading role in reconciling different views on EMU and fostering political commitment to a European currency among the Member States. [less ▲]

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See detailForschungsergebnisse und Forschungslücken zu Mehrsprachigkeit in der non-formalen Bildung in Luxemburg
Neumann, Sascha; Kirsch, Claudine UL

Scientific Conference (2022, November 17)

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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 ▲]

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See detailDo your magic, Harry Potter! popular fiction books and their impact on students’ reading performances
Krämer, Charlotte UL; Rathmacher, Yannick UL; Ottenbacher, Martha UL et al

Poster (2022, November 10)

Previous surveys on the reading habits of Luxembourgish secondary school students (conducted within the framework of the national school monitoring programme Épreuves Standardisées (ÉpStan) in 2016 and ... [more ▼]

Previous surveys on the reading habits of Luxembourgish secondary school students (conducted within the framework of the national school monitoring programme Épreuves Standardisées (ÉpStan) in 2016 and 2019) revealed better reading comprehension results in French and German for those students who frequently read printed narrative texts in their leisure time. However, these studies only focused on different reading modes and text types. They did not investigate which digital and/or printed books students actually read for pleasure, nor which text features determine the positive impact narrative texts have on their reading performances: Is it, for example, the language quality, the richness and complexity of content, or simply the amount of written language they need to process? Therefore, we conducted an explorative follow-up survey within the framework of ÉpStan 2020 and asked secondary school students (Grade 7: n=3055; Grade 9: n=5781) to indicate up to three book titles – printed and e-books respectively – they had read in their leisure time. Despite the omnipresence of digital media, preliminary findings show that both age groups prefer paper-based reading activities when reading longer texts (or books) for pleasure. Nevertheless, the most popular text types and book titles are the same for printed books and e-books: Among them, we find the novel series “Harry Potter”, the rather comic-like book series “Gregs Tagebuch”, and the mangas from the “Naruto”/“Boruto” series. The linkage between students’ leisure time reading activities and their ÉpStan reading performances will be drawn, and some first linguistic text analyses of extracts from the most popular book titles will be conducted in order to reveal some of the text features that foster reading comprehension skills. [less ▲]

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See detailEarly Childhood Education and Care in Luxembourg - Is attendance influenced by immigration background and socioeconomic status?
Kaufmann, Lena Maria UL; Fischbach, Antoine UL; Ottenbacher, Martha UL et al

Poster (2022, November 10)

For decades, researchers have been raising awareness of the issue of educational inequalities in the multilingual Luxemburgish school system. Especially children from families with a migration background ... [more ▼]

For decades, researchers have been raising awareness of the issue of educational inequalities in the multilingual Luxemburgish school system. Especially children from families with a migration background or a lower socio-economic status show large deficits in their language and mathematics competences in comparison to their peers. The same applies to children who do not speak Luxemburgish or German as their first language (Hornung et al., 2021; Sonnleitner et al., 2021). One way to reduce such educational inequalities might be an early and extensive participation in early childhood education and care (ECEC). Indeed, participation in ECEC was found to be positively connected to language and cognitive development in other countries, especially for children from disadvantaged families (Bennett, 2012). However, these children attend ECEC less often (Vandenbroeck & Lazzari, 2014). There are indications that lower parental costs might go hand in hand with a greater attendance of ECEC in general (for a Luxembourgish study, see Bousselin, 2019) and in particular by disadvantaged families (Busse & Gathmann, 2020). The aim of this study is to spotlight the attendance of ECEC in Luxembourg during the implementation of the ECEC reform after 2017 which increased free ECEC hours for all families from 3 to 20 hours a week. We draw on a large dataset of about 35.000 children from the Épreuves Standardisées (ÉpStan, the Luxemburg school monitoring programme) from 2015 to 2021 and investigate which children attend any kind of regulated ECEC service (public, private or family daycare) in which intensity, taking socio-economic and cultural family factors into account. The findings might help to understand in which contexts ECEC attendance should be further encouraged. Implications for future policy decisions are discussed with the goal of further promoting equal educational opportunities for all children. [less ▲]

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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 ▲]

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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 ▲]

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See detailGender and diversity representations in textbooks in Luxembourgish secondary education.
Kerger, Sylvie UL; Pianaro, Enrica UL; Schadeck, Claire UL

Poster (2022, November 10)

Teaching materials, and particularly textbooks, play an essential role in the socialisation of children through the communication of values. As „textbooks are not a reflection of reality, but an ... [more ▼]

Teaching materials, and particularly textbooks, play an essential role in the socialisation of children through the communication of values. As „textbooks are not a reflection of reality, but an arrangement of the representation of a society that they legitimise” (Brugeilles & Cromer, 2008, p.42), we argue that they contribute to challenging, perpetuating, or increasing gender inequalities. The results of our first study on Luxemburgish primary school textbooks, already published, indicate an androcentric view (Kerger & Brasseur, 2021). In every textbook, we counted more male than female characters in the texts and the illustrations. Men are more often represented in professional activities, while women are more likely to perform domestic activities. The celebrities represented are more often men than women. This poster presents the results of history textbooks in secondary school. It shows an ethnocentric perspective on the representation of non-white characters and those with disabilities. People with disabilities are almost exclusively portrayed when disability as a subject is being discussed. Use of racist language. These representations do not transmit the realities of societal complexities and they contribute to the marginalization and discrimination of non-white people and people with disabilities. [less ▲]

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See detailTowards a fairer assessment of cognitive abilities in multilingual children
Kijamet, Dzenita UL; Ugen, Sonja UL

Scientific Conference (2022, November 10)

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See detailWhat Primary Schools Are Doing Right: Educational Value-Added in Luxembourg
Emslander, Valentin UL; Levy, Jessica UL; Fischbach, Antoine UL

Poster (2022, November 10)

In such a diverse context as Luxembourg, educational inequalities can arise from diverse languages spoken at home, a migration background, or a family’s socioeconomic status. This diversity leads to ... [more ▼]

In such a diverse context as Luxembourg, educational inequalities can arise from diverse languages spoken at home, a migration background, or a family’s socioeconomic status. This diversity leads to different preconditions for learning math and languages (e.g. the language of instruction) and thus shapes the school careers of students (Hadjar & Backes, 2021). The aim of the project Systematic Identification of High Value-Added in Educational Contexts (SIVA) was to answer the questions (1) what highly effective schools are doing “right” or differently and (2) what other schools can learn from them in alleviating inequalities. In collaboration with the Observatoire National de la Qualité Scolaire, we investigated the differences of schools with stable high value-added (VA) scores to those with stable medium or low VA scores from multiple perspectives. VA is a statistical regression method usually used to fairly estimate schools’ effectiveness considering diverse student backgrounds. First, we identified 16 schools which had a stable high, medium, or low VA scores over two years. Second, we collected data on their pedagogical strategies, student background, and school climate through questionnaires and classroom observations. Third, we matched our data to results from the Luxembourg School Monitoring Programme ÉpStan (LUCET, 2021). We selected the variables based on learning models focusing on aspects such as school organization or classroom management (e.g., Hattie, 2008; Helmke et al., 2008; Klieme et al., 2001). We further investigated specificities about the Luxembourgish school system, which are not represented in international school learning models (such as the division into two-year learning cycles, the multilingual school setting, or the diverse student population). We will discuss the SIVA-project, its goals, and its data collection leading to data from observations in 49 classroom and questionnaires with over 500 second graders, their parents, their teachers, as well as school presidents and regional directors. Literature Hadjar, A., & Backes, S. (2021). Bildungsungleichheiten am Übergang in die Sekundarschule in Luxemburg. https://doi.org/10.48746/BB2021LU-DE-21A Hattie, J. (2008). Visible Learning: A synthesis of over 800 meta-analyses relating to achievement (0 ed.). Routledge. https://doi.org/10.4324/9780203887332 Helmke, A., Rindermann, H., & Schrader, F.-W. (2008). Wirkfaktoren akademischer Leistungen in Schule und Hochschule [Determinants of academic achievement in school and university]. In M. Schneider & M. Hasselhorn (Eds.), Handbuch der pädagogischen Psychologie (Vol. 10, pp. 145–155). Hogrefe. Klieme, E., Schümer, G., & Knoll, S. (2001). Mathematikunterricht in der Sekundarstufe I: “Aufgabenkultur” und Unterrichtsgestaltung. TIMSS - Impulse für Schule und Unterricht, 43–57. LUCET. (2021). Épreuves Standardisées (ÉpStan). https://epstan.lu [less ▲]

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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 ▲]

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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 ▲]

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See detailSecure and Distributed Assessment of Privacy-Preserving Releases of GWAS
Pascoal, Túlio UL; Decouchant, Jérémie; Volp, Marcus UL

in ACM/IFIP International Middleware Conference (2022, November)

Genome-wide association studies (GWAS) identify correlations between the genetic variants and an observable characteristic such as a disease. Previous works presented privacy-preserving distributed ... [more ▼]

Genome-wide association studies (GWAS) identify correlations between the genetic variants and an observable characteristic such as a disease. Previous works presented privacy-preserving distributed algorithms for a federation of genome data holders that spans multiple institutional and legislative domains to securely compute GWAS results. However, these algorithms have limited applicability, since they still require a centralized instance to decide whether GWAS results can be safely disclosed, which is in violation to privacy regulations, such as GDPR. In this work, we introduce GenDPR, a distributed middleware that leverages Trusted Execution Environments (TEEs) to securely determine a subset of the potential GWAS statistics that can be safely released. GenDPR achieves the same accuracy as centralized solutions, but requires transferring significantly less data because TEEs only exchange intermediary results but no genomes. Additionally, GenDPR can be configured to tolerate all-but-one honest-but-curious federation members colluding with the aim to expose genomes of correct members. [less ▲]

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See detailSpecifying Source Code and Signal-based Behaviour of CPS Components
Dawes, Joshua UL; Bianculli, Domenico UL

in Dawes, Joshua; Bianculli, Domenico (Eds.) Proceedings of the 18th International Conference on Formal Aspects of Component Software (2022, November)

Specifying properties over the behaviour of components of Cyber-Physical Systems usually focuses on the behaviour of signals, i.e., the behaviour of the physical part of the system, leaving the behaviour ... [more ▼]

Specifying properties over the behaviour of components of Cyber-Physical Systems usually focuses on the behaviour of signals, i.e., the behaviour of the physical part of the system, leaving the behaviour of the cyber components implicit. There have been some attempts to provide specification languages that enable more explicit reference to the behaviour of cyber components, but it remains awkward to directly express the behaviour of both cyber and physical components in the same specification, using one formalism. In this paper, we introduce a new specification language, Source Code and Signal Logic (SCSL), that 1) provides syntax specific to both signals and events originating in source code; and 2) does not require source code events to be abstracted into signals. We introduce SCSL by giving its syntax and semantics, along with examples. We then provide a comparison between SCSL and existing specification languages, using an example property, to show the benefit of using SCSL to capture certain types of properties. [less ▲]

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See detailDISCOV: Stimulating Physical Activity through an Explorative Interactive Walking Experience
van Renswouw, Loes; Verhoef, Jasmijn; Vos, Steven et al

in [ ] With Design: Reinventing Design Modes (2022, November)

Aware of the consequences of their inactive lifestyles, many people still struggle to integrate enough physical activity into their busy lives. Interventions that nudge to reinforce existing active ... [more ▼]

Aware of the consequences of their inactive lifestyles, many people still struggle to integrate enough physical activity into their busy lives. Interventions that nudge to reinforce existing active behavior seem therefore more likely to be effective than those adding an activity to daily routines. To encourage people to increase their physical activity level, we designed Discov, a network of physical waypoints triggering people to lengthen their walks. Placed in a public park, Discov encourages people to explore their surroundings in a fun and challenging way by creating an interactive walking experience. Adopting a Research-through-Design approach, we explore the potential of the design of accessible infrastructures and human-environment interactions to impact public health by nudging citizens into being more physically active. We discuss insights gathered through this process and report on first user tests of this interactive walking experience. [less ▲]

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See detailAsynja: Sensorial Design for Running Motivation
Menheere, Daphne; Hilderink, Myrthe; Vos, Steven et al

in [ ] With Design: Reinventing Design Modes (2022, November)

If starting to run is an easy decision, committing to a long-term running routine proves to be a more challenging endeavor for many people. In this pictorial, we unravel the design process of Asynja, an ... [more ▼]

If starting to run is an easy decision, committing to a long-term running routine proves to be a more challenging endeavor for many people. In this pictorial, we unravel the design process of Asynja, an artefact that triggers exercise imagery by using natural scents related to running. Relying on peripheral interaction, this research probe subtly nudges users to go running, thereby supporting them to transform their positive intentions into actions. Exploring sensoriality as a design opportunity for behavior change interventions, we invite the community to expand the design space of exercise-related motivational products and systems. [less ▲]

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See detailUX Needs Cards – A Pragmatic Tool to Support Experience Design Through Psychological Needs
Lallemand, Carine UL

in [ ] With Design: Reinventing Design Modes (2022, November)

The psychological needs-driven UX approach is a well-explored area in UX research and a powerful framework for the design of optimal experiences with systems and products. However, the transfer from ... [more ▼]

The psychological needs-driven UX approach is a well-explored area in UX research and a powerful framework for the design of optimal experiences with systems and products. However, the transfer from research to practice is slow and this approach is not yet widely used by practitioners. As card- based methods have been shown to support designers in both the generation of ideas and the evaluation of their designs, we created the UX needs cards as a pragmatic tool able to support a needs-driven UX process. We present the iterative development of the card-set and its associated techniques and report on three use cases, demonstrating the effectiveness of this tool for user research, idea generation and UX evaluation. Our empirical findings suggest that the UX needs cards are a valuable tool able to support design practice, being easily understood by lay users and a source of inspiration for designers. Acting as a tangible translation of a research framework, the UX needs cards promote theory-driven design strategies and provide researchers, designers, and educators with a tool to clearly communicate the framework of psychological needs. [less ▲]

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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 ▲]

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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 ▲]

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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)

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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)

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See detailBiomechanische Untersuchung zu verschiedenen Verfahren der Stabilisierung von Insuffizienzfrakturen des vorderen Beckenringes
Gerich, Torsten; Soliman, Ahmed Abdelsalam Mohamed UL; Ricci, Pierre-Louis et al

Poster (2022, October 26)

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See detailLearning to Grasp on the Moon from 3D Octree Observations with Deep Reinforcement Learning
Orsula, Andrej UL; Bøgh, Simon; Olivares Mendez, Miguel Angel UL et al

Scientific Conference (2022, October 24)

Extraterrestrial rovers with a general-purpose robotic arm have many potential applications in lunar and planetary exploration. Introducing autonomy into such systems is desirable for increasing the time ... [more ▼]

Extraterrestrial rovers with a general-purpose robotic arm have many potential applications in lunar and planetary exploration. Introducing autonomy into such systems is desirable for increasing the time that rovers can spend gathering scientific data and collecting samples. This work investigates the applicability of deep reinforcement learning for vision-based robotic grasping of objects on the Moon. A novel simulation environment with procedurally-generated datasets is created to train agents under challenging conditions in unstructured scenes with uneven terrain and harsh illumination. A model-free off-policy actor-critic algorithm is then employed for end-to-end learning of a policy that directly maps compact octree observations to continuous actions in Cartesian space. Experimental evaluation indicates that 3D data representations enable more effective learning of manipulation skills when compared to traditionally used image-based observations. Domain randomization improves the generalization of learned policies to novel scenes with previously unseen objects and different illumination conditions. To this end, we demonstrate zero-shot sim-to-real transfer by evaluating trained agents on a real robot in a Moon-analogue facility. [less ▲]

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See detailImpacting the computerization and Digitalization in Luxembourg: the case of teachers and education
Noguera, Carmen UL

Scientific Conference (2022, October 21)

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailRetrieving traces of the Luxembourg WebSphere through its first websites
Noguera, Carmen UL

Scientific Conference (2022, October 18)

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See detailKeynote by panel on Looking ahead: after web (archives)?
Noguera, Carmen UL

Scientific Conference (2022, October 18)

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See detailHistoire des territoires belges annexés au IIIe Reich
Brüll, Christoph UL

Scientific Conference (2022, October 15)

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See detailAutomatic Repair and Deadlock Detection for Parameterized Systems
Jacobs, Swen; Sakr, Mouhammad UL; Volp, Marcus UL

in Automatic Repair and Deadlock Detection for Parameterized Systems (2022, October 15)

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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 ▲]

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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 ▲]

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See detailPerformance Modeling of Weather Forecast Machine Learning for Efficient HPC
Panner Selvam, Karthick UL; Brorsson, Mats Hakan UL

in Panner Selvam, Karthick; Brorsson, Mats Hakan (Eds.) Performance Modeling of Weather Forecast Machine Learning for Efficient HPC (2022, October 13)

High-performance computing is a prime area for many applications. Majorly, weather and climate forecast applications use the HPC system because it needs to give a good result with low latency. In recent ... [more ▼]

High-performance computing is a prime area for many applications. Majorly, weather and climate forecast applications use the HPC system because it needs to give a good result with low latency. In recent years machine learning and deep learning models have been widely used to forecast the weather. However, to the best of the author’s knowledge, many applications do not effectively utilise the HPC system for training, testing, validation, and inference of weather data. Our experiment is to conduct performance modeling and benchmark analysis of weather and climate forecast machine learning models and determine the characteristics between the application, model and the underlying HPC system. Our results will help the researchers improvise and optimise the weather forecast system and use the HPC system efficiently. [less ▲]

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See detailCentralized or not Centralized? Topology Analysis of the XRP Ledger
Tumas, Vytautas UL; Rivera, Sean UL; Magoni, Damien et al

Scientific Conference (2022, October 12)

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

XRP is one of the oldest, well-established cryptocurrencies. Despite the popularity of XRP, 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 Network topology and its temporal characteristics. We crawl the XRP Network 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 ▲]

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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 ▲]

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See detailEugenia, incarnée par Marina Hands, dans Actrice de Pascal Rambert : le corps d’une mourante comme figuration de la Dame Blanche
Deregnoncourt, Marine UL

in Laforêt, Carole; Raimbault, Nicole (Eds.) Les femmes et leur corps (2022, October 10)

Soit cette description physique de l’actrice franco-britannique Marina Hands par Éric Ruf (Administrateur Général de la Comédie-Française depuis 2014) : Marina est une jeune femme très belle, mais elle a ... [more ▼]

Soit cette description physique de l’actrice franco-britannique Marina Hands par Éric Ruf (Administrateur Général de la Comédie-Française depuis 2014) : Marina est une jeune femme très belle, mais elle a une beauté très singulière. Elle ne correspond en rien au canon. Elle a des épaules des nageuses est-allemandes, elle a des bras longs comme des kilomètres, elle est massive, elle a une drôle de tronche avec des pommettes extrêmement saillantes. Elle n’a pas une beauté classique. Nous avons conclu ainsi notre exposé au 10ème colloque orléanais consacré aux sorcières. En vue de contribuer humblement et d’apporter modestement notre pierre à l’édifice du prochain congrès intitulé : « Femmes des lumières et de l'ombre. Les Femmes et leur Corps », nous entendons, par le biais de cette nouvelle communication, prolonger notre réflexion initiale sur Marina Hands en nous axant plus particulièrement, cette fois-ci, sur le corps de cette comédienne au miroir de son interprétation d’Eugenia dans Actrice de Pascal Rambert. Tout d’abord, en quoi le corps de Marina Hands peut-il être défini comme « masculin » et quels en sont, non seulement, les enjeux, mais aussi, les implications sur son jeu d’actrice ? C’est précisément ce que nous entendons aborder, par la suite, avec le rôle d’Eugenia, protagoniste autour de laquelle se construit l’action d’Actrice de Pascal Rambert. Pourquoi le corps d’Eugenia, mourante, peut-il être perçu comme une figuration de la Dame Blanche, messagère de la mort, et comment Pascal Rambert, renforce-t-il cette idée en construisant un requiem, par un dispositif scénographique singulier ? C’est spécifiquement à ces trois questions centrales auxquelles cette présentation souhaite répondre [less ▲]

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See detailRace and gender homophily in collaborations and citations
Kozlowski, Diego UL; Larivière, Vincent; Sugimoto, Cassidy R. et al

Scientific Conference (2022, October 09)

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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 ▲]

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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 ▲]

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See detailA Secure Authentication Protocol for Cholesteric Spherical Reflectors using Homomorphic Encryption
Arenas Correa, Monica Patricia UL; Bingol, Muhammed Ali; Demirci, Huseyin UL et al

in Lecture Notes in Computer Science (2022, October 06), 13503

Sometimes fingerprint-like features are found in a material. The exciting discovery poses new challenges on how to use the features to build an object authentication protocol that could tell customers and ... [more ▼]

Sometimes fingerprint-like features are found in a material. The exciting discovery poses new challenges on how to use the features to build an object authentication protocol that could tell customers and retailers equipped with a mobile device whether a good is authentic or fake. We are exactly in this situation with Cholesteric Spherical Reflectors (CSRs), tiny spheres of liquid crystals with which we can tag or coat objects. They are being proposed as a potential game-changer material in anti-counterfeiting due to their unique optical properties. In addition to the problem of processing images and extracting the minutiæ embedded in a CSR, one major challenge is designing cryptographically secure authentication protocols. The authentication procedure has to handle unstable input data; it has to measure the distance between some reference data stored at enrollment and noisy input provided at authentication. We propose a cryptographic authentication protocol that solves the problem, and that is secure against semi-honest and malicious adversaries. We prove that our design ensures data privacy even if enrolled data are leaked and even if servers and provers are actively curious. We implement and benchmark the protocol in Python using the Microsoft SEAL library through its Python wrapper PySEAL. [less ▲]

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See detailL'espace frontalier franco-luxembourgeois vu depuis le Luxembourg
Brüll, Christoph UL

Scientific Conference (2022, October 02)

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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 ▲]

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See detailPEELER: Learning to Effectively Predict Flakiness without Running Tests
Qin, Yihao; Wang, Shangwen; Liu, Kui et al

in Proceedings of the 38th IEEE International Conference on Software Maintenance and Evolution (2022, October)

—Regression testing is a widely adopted approach to expose change-induced bugs as well as to verify the correctness/robustness of code in modern software development settings. Unfortunately, the ... [more ▼]

—Regression testing is a widely adopted approach to expose change-induced bugs as well as to verify the correctness/robustness of code in modern software development settings. Unfortunately, the occurrence of flaky tests leads to a significant increase in the cost of regression testing and eventually reduces the productivity of developers (i.e., their ability to find and fix real problems). State-of-the-art approaches leverage dynamic test information obtained through expensive re-execution of test cases to effectively identify flaky tests. Towards accounting for scalability constraints, some recent approaches have built on static test case features, but fall short on effectiveness. In this paper, we introduce PEELER, a new fully static approach for predicting flaky tests through exploring a representation of test cases based on the data dependency relations. The predictor is then trained as a neural network based model, which achieves at the same time scalability (because it does not require any test execution), effectiveness (because it exploits relevant test dependency features), and practicality (because it can be applied in the wild to find new flaky tests). Experimental validation on 17,532 test cases from 21 Java projects shows that PEELER outperforms the state-of-the-art FlakeFlagger by around 20 percentage points: we catch 22% more flaky tests while yielding 51% less false positives. Finally, in a live study with projects in-the-wild, we reported to developers 21 flakiness cases, among which 12 have already been confirmed by developers as being indeed flaky. [less ▲]

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See detailTowards the Application of Neuromorphic Computing to Satellite Communications
Ortiz Gomez, Flor de Guadalupe UL; Lagunas, Eva UL; Alves Martins, Wallace UL et al

in Towards the Application of Neuromorphic Computing to Satellite Communications (2022, October)

Artificial intelligence (AI) has recently received significant attention as a key enabler for future 5G-and-beyond terrestrial wireless networks. The applications of AI to satellite communications is also ... [more ▼]

Artificial intelligence (AI) has recently received significant attention as a key enabler for future 5G-and-beyond terrestrial wireless networks. The applications of AI to satellite communications is also gaining momentum to realize a more autonomous operation with reduced requirements in terms of human intervention. The adoption of AI for satellite communications will set new requirements on computing processors, which will need to support large workloads as efficiently as possible under harsh environmental conditions. In this context, neuromorphic processing (NP) is emerging as a bio-inspired solution to address pattern recognition tasks involving multiple, possibly unstructured, temporal signals and/or requiring continual learning. The key merits of the technology are energy efficiency and capacity for on-device adaptation. In this paper, we highlight potential use cases and applications of NP to satellite communications. We also explore major technical challenges for the implementation of space-based NP focusing on the available NP chipsets. [less ▲]

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See detailTransition Pathways towards Design Principles of Self-Sovereign Identity
Sedlmeir, Johannes; Huber, Jasmin; Barbereau, Tom Josua UL et al

in Forty-Third International Conference on Information Systems (2022, October)

Society’s accelerating digital transformation during the COVID-19 pandemic highlighted clearly that the Internet lacks a secure, efficient, and privacy-oriented model for identity. Self-sovereign identity ... [more ▼]

Society’s accelerating digital transformation during the COVID-19 pandemic highlighted clearly that the Internet lacks a secure, efficient, and privacy-oriented model for identity. Self-sovereign identity (SSI) aims to address core weaknesses of siloed and federated approaches to digital identity management from both users’ and service providers’ perspectives. SSI emerged as a niche concept in libertarian communities, and was initially strongly associated with blockchain technology. Later, when businesses and governments began to invest, it quickly evolved towards a mainstream concept. To investigate this evolution and its effects on SSI, we conduct design science research rooted in the theory of technological transition pathways. Our study identifies nine core design principles of SSI as deployed in relevant applications, and discusses associated competing political and socio-technical forces in this space. Our results shed light on SSI’s key characteristics, its development pathway, and tensions in the transition between regimes of digital identity management [less ▲]

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See detailThe EU's Digital Identity Policy: Tracing Policy Punctuations
Weigl, Linda UL; Amard, Alexandre UL; Fridgen, Gilbert UL et al

in Proceedings of the International Conference on Theory and Practice of Electronic Governance 2022 (2022, October)

This paper analyzes the development of the European Union’s digital identity policy. The analysis focuses on the dynamics leading to a sudden shift from identity management as a sensitive topic under ... [more ▼]

This paper analyzes the development of the European Union’s digital identity policy. The analysis focuses on the dynamics leading to a sudden shift from identity management as a sensitive topic under national competence towards a common, harmonized, user-centric European Digital Identity Framework layering on top of Member States’ existing systems. We adopted a syncretic approach to Punctuated Equilibrium Theory and focused specifically on the concept of policy punctuations and policy image. Process tracing is used as a method to trace and interpret causal mechanisms of policy processes. The empirical analysis is grounded in elite interviews and policy documentation. To open up the black box of policy-making, we analyze and disaggregate the policy process. We thereby provide a better understanding of the historical-political and technological mechanisms that determine particular policy outcomes. [less ▲]

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See detailChildren’s perspectives on their learning experiences during the pandemic
Kirsch, Claudine UL

Scientific Conference (2022, October)

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See detailNanosensor Location in the Human Circulatory System Based on Electric Circuit Representation of Vessels
Gómez, Jorge Torres; Gonzalez Rios, Jorge Luis UL; Dressler, Falko

in Proceedings of the 9th ACM International Conference on Nanoscale Computing and Communication (2022, October)

Nanotechnologies are advancing precision medicine applications, enhancing the detection and treatment of diseases. Traveling through the human vessels, nanosensors are envisioned to locally detect and ... [more ▼]

Nanotechnologies are advancing precision medicine applications, enhancing the detection and treatment of diseases. Traveling through the human vessels, nanosensors are envisioned to locally detect and actuate on targets very efficiently. In this area, modeling the behavior of traveling nanosensors in the human circulatory system helps developing new mechanisms for medical treatments. This paper explores the accurate modeling of the concentration level of the flowing nanosensors in vessels. We use a Markov chain formulation to predict the stationary distribution of them in the variety of vessel segments. To evaluate the transition probabilities of the Markov chain, we compute the blood flow based on the representation of vessels through electric circuit components. The resulting study reveals the dynamics of the movement of nanosensors in the blood flow yielding further details on their concentration level along vessels. [less ▲]

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See detailThe Role of Cultural Fit in the Adoption of Fashionable IT: A Blockchain Case Study
Roth, Tamara UL; Rieger, Alexander UL; Utz, Manuel et al

in Forty-Third International Conference on Information Systems (2022, October)

Investments in fashionable IT do not make organizations more successful than investments in less fashionable alternatives. Many organizations nevertheless associate with fashionable IT to signal ... [more ▼]

Investments in fashionable IT do not make organizations more successful than investments in less fashionable alternatives. Many organizations nevertheless associate with fashionable IT to signal compliance with norms of progress and rationality. These decisions can be risky as fashionable IT is often surrounded by wishful and unbalanced discourse, especially in the ‘fashion up-swing’. Engagement with fashionable IT thus requires the ability to navigate hype narratives and fit the new technology into the adopting organization. Fit needs to be established in many regards, such as political and technological. In this paper, we explore a third and so far, understudied perspective: cultural fit between the values attributed to the fashionable IT through the fashion discourse and those of the recipient organizational context. Through an inductive case study of two blockchain projects, we find that cultural fit can equally be an important determinant for successful adoption of fashionable IT. Moreover, we develop a process theory for how cultural fit can be established through a process of cultural sensemaking and dissonance reduction along two recursive pathways. Adopting organizations can change their implementation of fashionable IT systems and re-frame the narratives surrounding them to fit their organization’s cultural values. Alternatively, they can transform their local or overarching organizational culture by integrating values attributed to the fashionable IT. Overall, we contribute a much-needed organizational culture perspective to IT fashions and extend the discussions on IT cultural conflict. [less ▲]

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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 ▲]

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See detailPost-quantum Plaintext-awareness
Ebrahimi, Ehsan UL; van Wier, Jeroen UL

in Post-quantum Plaintext-awareness (2022, September 28)

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See detailThe use of media in language teaching
Lejot, Eve UL; Krames, Marion

Scientific Conference (2022, September 24)

Multilingual teaching and the promotion of multilingualism among students are important principles of the University of Luxembourg. For their implementation, a variety of e-learning resources are used ... [more ▼]

Multilingual teaching and the promotion of multilingualism among students are important principles of the University of Luxembourg. For their implementation, a variety of e-learning resources are used, adapted to the needs of the learners. We will give an overview of new multimodal communication practices and methods used by learners in multilingual contexts which naturally lead teachers to rethink their approach and incorporate media into their teaching strategies. The hybrid nature of devices (computers, tablets, televisions, smartphones, paper, interactive whiteboards, etc.) and digital tools (document sharing platforms, online correction tools, interactive exercises, online learning programmes, dictionaries, video editing software, automatic pronunciation correction, etc.) offer a great potential to interactive and mobile teaching and learning. We will illustrate this potential by giving an example of how to develop text production competence in Chinese as a foreign language in a motivating way using the content management system Moodle. Our reflection aims at optimising the quality of language teaching both in and out of the classroom. [less ▲]

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See detailAndroid Malware Detection Using BERT
Souani, Badr UL; Khanfir, Ahmed UL; Bartel, Alexandre UL et al

in Jianying, Zhou (Ed.) Applied Cryptography and Network Security Workshops (2022, September 24)

In this paper, we propose two empirical studies to (1) detect Android malware and (2) classify Android malware into families. We rst (1) reproduce the results of MalBERT using BERT models learning with ... [more ▼]

In this paper, we propose two empirical studies to (1) detect Android malware and (2) classify Android malware into families. We rst (1) reproduce the results of MalBERT using BERT models learning with Android application's manifests obtained from 265k applications (vs. 22k for MalBERT) from the AndroZoo dataset in order to detect malware. The results of the MalBERT paper are excellent and hard to believe as a manifest only roughly represents an application, we therefore try to answer the following questions in this paper. Are the experiments from MalBERT reproducible? How important are Permissions for mal- ware detection? Is it possible to keep or improve the results by reducing the size of the manifests? We then (2) investigate if BERT can be used to classify Android malware into families. The results show that BERT can successfully di erentiate malware/goodware with 97% accuracy. Further- more BERT can classify malware families with 93% accuracy. We also demonstrate that Android permissions are not what allows BERT to successfully classify and even that it does not actually need it. [less ▲]

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See detailMethods for increasing the dependability of High-performance, Many-core, System-on-Chips
Graczyk, Rafal UL; Memon, Md Saad UL; Volp, Marcus UL

in Graczyk, Rafal; Memon, Md Saad; Volp, Marcus (Eds.) IAC 2022 congress proceedings, 73rd International Astronautical Congress (IAC) (2022, September 21)

Future space exploration and exploitation missions will require significantly increased autonomy of operation for mission planning, decision-making, and adaptive control techniques. Spacecrafts will ... [more ▼]

Future space exploration and exploitation missions will require significantly increased autonomy of operation for mission planning, decision-making, and adaptive control techniques. Spacecrafts will integrate new processing and compression algorithms that are often augmented with machine learning and artificial intelligence capabilities. This functionality will have to be provided with high levels of robustness, reliability, and dependability for conducting missions successfully. High-reliability requirements for space-grade processors have led to trade-offs in terms of costs, energy efficiency, and performance to obtain robustness. However, while high-performance / low-robustness configurations are acceptable in the Earth's vicinity, where assets remain protected by the planet's magnetosphere, they cease to work in more demanding environments, like cis-lunar or deep space, where high-energy particles will affect modern components heavily, causing temporary or permanent damage and ultimately system failures. The above has led to a situation where state-of-the-art processing elements (processors, co-processors, memories, special purpose accelerators, and field-programmable-gate arrays (FPGAs), all possibly integrated into System-on-a-Chip (SoC) designs) are superior to their high reliability, space-qualified counterparts in terms of processing power or energy efficiency. For example, from modern, state-of-the-art (SOTA) devices, one can expect a 2-3 order-of-magnitude performance per Watts improvement over space-grade equipment. Likewise, one finds a gap of approximately nine technology nodes between devices, which translates into a factor 25 decrease in operations per Watts. In this paper, we demonstrate how to utilize part of this enormous performance advantage to increase the robustness and resilience of otherwise susceptible semiconductor devices while harnessing the remaining processing power to build affordable space systems capable of hosting the compute-intensive functionality that future space missions require. We are bridging this performance-reliability gap by researching the enabling building blocks for constructing reliable and secure, space-ready Systems-on-a-Chip from SOTA processing elements. [less ▲]

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See detailHardware-in-the-loop Proximity Operations in Cislunar Space
Muralidharan, Vivek UL; Makhdoomi, Mohatashem Reyaz UL; Barad, Kuldeep Rambhai UL et al

Scientific Conference (2022, September 20)

Space missions to Near Rectilinear Halo Orbits (NRHOs) in the Earth-Moon system are upcoming. A rendezvous technique in the cislunar space is proposed in this investigation, one that leverages coupled ... [more ▼]

Space missions to Near Rectilinear Halo Orbits (NRHOs) in the Earth-Moon system are upcoming. A rendezvous technique in the cislunar space is proposed in this investigation, one that leverages coupled orbit and attitude dynamics in the Circular Restricted Three-body Problem (CR3BP). An autonomous Guidance, Navigation and Control (GNC) technique is demonstrated in which a chaser spacecraft approaches a target spacecraft in the southern 9:2 synodic-resonant L2 Near Rectilinear Halo Orbit (NRHO), one that currently serves as the baseline for NASA's Gateway. A two-layer control approach is contemplated. First, a nonlinear optimal controller identifies an appropriate baseline rendezvous path, both in position and orientation. As the spacecraft progresses along the pre-computed baseline path, optical sensors measure the relative pose of the chaser relative to the target. A Kalman filter processes these observations and offers precise state estimates. A linear controller compensates for any deviations identified from the predetermined rendezvous path. The efficacy of the GNC technique is tested by considering a complex scenario in which the rendezvous operation is conducted with a non-cooperative tumbling target. Hardware-in-the-loop laboratory experiments are conducted as proof-of-concept to validate the guidance algorithm, with observations supplemented by optical navigation techniques. [less ▲]

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See detailSMASCH: Facilitating multi-appointment scheduling in longitudinal clinical research studies and care programs
Vega Moreno, Carlos Gonzalo UL; Gawron, Piotr UL; Lebioda, Jacek et al

Poster (2022, September 20)

Longitudinal clinical research studies require conducting various assessments over long periods of time. Such assessments comprise numerous stages, requiring different resources defined by ... [more ▼]

Longitudinal clinical research studies require conducting various assessments over long periods of time. Such assessments comprise numerous stages, requiring different resources defined by multidisciplinary research staff and aligned with available infrastructure and equipment, altogether constrained by time. While it is possible to manage the allocation of resources manually, it is complex and error-prone. Efficient multi-appointment scheduling is essential to assist clinical teams, ensuring high participant retention and producing successful clinical studies, directly impacting patient throughput and satisfaction. We present Smart Scheduling (SMASCH) system [1], a web application for multi-appointment scheduling management aiming to reduce times, optimise resources and secure personal identifiable information. SMASCH facilitates clinical research and integrated care programs in Luxembourg, providing features to better manage multi-appointment scheduling problems (MASPs) characteristic of longitudinal clinical research studies and speed up management tasks. It is present in multiple clinical research and integrated care programs in Luxembourg since 2017, including Dementia Prevention Program, the study for Mild Cognitive Impairment and gut microbiome, and the National Centre of Excellence in Research on Parkinson’s disease [2] which encompasses the study for REM sleep behaviour disorder and the Luxembourg Parkinson’s Study. SMASCH is a free and open-source solution available both as a Linux package and Docker image. [less ▲]

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See detailMachine learning applied to higher order functional representations of omics data reveals biological pathways associated with Parkinson‘s Disease
Gómez de Lope, Elisa UL; Glaab, Enrico UL

Poster (2022, September 18)

Background: Despite the increasing prevalence of Parkinson’s Disease (PD) and research efforts to understand its underlying molecular pathogenesis, early diagnosis of PD remains a challenge. Machine ... [more ▼]

Background: Despite the increasing prevalence of Parkinson’s Disease (PD) and research efforts to understand its underlying molecular pathogenesis, early diagnosis of PD remains a challenge. Machine learning analysis of blood-based omics data is a promising non-invasive approach to finding molecular fingerprints associated with PD that may enable an early and accurate diagnosis. Description: We applied several machine learning classification methods to public omics data from PD case/control studies. We used aggregation statistics and Pathifier’s pathway deregulation scores to generate higher order functional representations of the data such as pathway-level features. The models’ performance and most relevant predictive features were compared with individual feature level predictors. The resulting diagnostic models from individual features and Pathifier’s pathway deregulation scores achieve significant Area Under the Curve (AUC, a receiver operating characteristic curve) scores for both cross-validation and external testing. Furthermore, we identify plausible biological pathways associated with PD diagnosis. Conclusions: We have successfully built machine learning models at pathway-level and single-feature level to study blood-based omics data for PD diagnosis. Plausible biological pathway associations were identified. Furthermore, we show that pathway deregulation scores can serve as robust and biologically interpretable predictors for PD. [less ▲]

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See detailA Communal Struggle: Team-Teaching at the University of Luxembourg
Rivas, Salvador UL; Bes Izuel, Maria Asuncion UL; Zutavern, Jan UL

Scientific Conference (2022, September 15)

INTRODUCTION Team-teaching, also known as collaborative-teaching, co-teaching and pair-lecturing has been practiced for ages (Buckley 2000). It is generally described as a positive pedagogical practice ... [more ▼]

INTRODUCTION Team-teaching, also known as collaborative-teaching, co-teaching and pair-lecturing has been practiced for ages (Buckley 2000). It is generally described as a positive pedagogical practice that can both enhance learning among students and the experience of teaching among instructors (Plank 2011, 2014). While it is acknowledged that team-teaching is not simple and requires great coordination among instructors, it is presented in gleaming terms for both instructors and students alike. More recent work highlights an increased necessity for collaborative-teaching due to the growing complexity in higher education combined with dwindling resources (Minett-Smith and Davis 2020), or as a deliberate cost-saving measure (Liebel et al. 2017). Yet, little quantitative evidence can be found in the literature showing the positive efficacy of this methodology, relative to Student Evaluation Teaching (SET) measures (for exception see: Carpenter et al. 2007). Thus, this study aims to answer: 1) how prevalent is team-teaching; 2) what are the most common team compositions (number of instructors, gender, instructor status and seniority); 3) are there any significant differences in SET scores relative to differences in composition; and 4) what can we learn from the open-text feedback to help us understand, or contextualize, any quantitative differences found between solo- versus team-taught courses? DATA & METHODS To address our research questions and investigate the contours of team teaching in the Faculty of Humanities, Education and Social Sciences (FHSE) at the University of Luxembourg, we use SET data (course feedback), as an indirect measure of quality of education (Marsh 2007). We use descriptive statistics and regression analysis to examine the quantitative feedback for a total of 2908 courses collected over eight semesters (Winter semester 2015-Summer semester 2019). We compliment these results with content analysis of open-text comments that help us understand and contextualize the quantitative findings. PRELIMINARY RESULTS While course feedback data does not directly measure the quality of learning experienced by students (i.e., whether students learn better in team-taught courses vs. solo instructor courses), it does however shed light on the general sentiment experienced and reported by participating students. Preliminary analyses indicate that approximately 30% of courses are team-taught (60% with two-person teams and 40% with teams of 3 and 4+ instructors). Furthermore, we found that, on average, team-taught courses receive significantly lower ratings from students than solo instructor courses. In the remainder of this article, we analyse this basic finding and discuss the implications for team teaching. [less ▲]

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See detailInstitutional determinants of intersectional inequalities in science
Kozlowski, Diego UL; Larivière, Vincent; Sugimoto, Cassidy R. et al

in BRIDGES BETWEEN DISCIPLINES: GENDER IN STEM AND SOCIAL SCIENCES (2022, September 12)

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See detail3D printed mathematics visualisations by STEAM teachers
Ulbrich, Eva; Tejera, Mathias; Haas, Ben et al

Scientific Conference (2022, September 12)

Visualising abstract concepts such as for example geometrical objects in mathematics can be a valuable support for learners. Visualisation, however, is a process involving several steps that influence ... [more ▼]

Visualising abstract concepts such as for example geometrical objects in mathematics can be a valuable support for learners. Visualisation, however, is a process involving several steps that influence each other. Duval (1998) uses steps connecting reasoning by an explanation or proof to a construction step involving tools creating a visualisation to a production of a visual representation leading to new insights about a geometrical object. Vágová (2020) argues that visualising geometrical objects needs the ability to create, manipulate, and transform mental images by an internal and an external representation which both require information about the spatial arrangement. 3D modelled and then visualised geometrical objects can support the development and train visualisation skills. Steps of visualisation processes require visuospatial competencies and are also important for other subjects in Science, Technology, Engineering, Arts and Mathematics (STEAM) education (Ng 2017). Being able to understand representations and their spatial rotations, transitions between 2D and 3D and being able to manipulate representations are valuable for STEAM related subjects (Kok 2020). Martin-Dorta et al. (2008) says that spatial abilities can be improved using real and computer-aided models. 3D printing can therefore be an interesting activity as it also combines the mentioned steps in a mathematical modelling way. This approach was used in a beginners course for pre-service mathematics teachers and some of them chose to create mathematical proofs as visualisation. We will look at 3D printed objects, which concepts they visualise and what teachers' ideas behind visualisations were. [less ▲]

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