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See detailKnowledge assessment with concept maps: Opportunities and challenges
Rohles, Björn UL; Koenig, Vincent UL; Fischbach, Antoine UL et al

Scientific Conference (2021, July)

21st-century digital society poses tremendous challenges for education and assessment. Learners have to understand the complex relations between diverse topics and learn how to learn their entire lives ... [more ▼]

21st-century digital society poses tremendous challenges for education and assessment. Learners have to understand the complex relations between diverse topics and learn how to learn their entire lives. Concept mapping is a promising approach to address these issues. It is a method that uses concepts connected by labeled links to visualize a semantic network of knowledge. Concept mapping is predestined for a digital approach because it allows for easy interactive editing, innovative test items, and incorporation of multimodal information. Concept mapping is available for summative and formative assessment and, thus, provides the opportunity to become a vital part of modern education. The biggest advantage of concept mapping (i.e., a comprehensive and yet comprehensible visualization of complex relations) also represents the biggest challenge when it comes to assessment with - and scoring of - concept maps. The first challenge is the enormous amount of indicators used for scoring concept maps in assessment. A second challenge comes from the fact that educators using concept mapping in their assessment have to understand and interpret the indicators that are used in scoring concept maps. This presentation reports on a Ph.D. project that investigates digital concept mapping in the context of knowledge assessment from a user experience perspective. The results are based on, first, a comprehensive international systematic literature review on concept map scoring, and second, three empirical studies covering the needs and experiences of learners and educators in concept mapping. It presents key findings from the iterative user experience design of a concept mapping tool as part of the online assessment platform OASYS, an overview of indicators used in concept map scoring, and research opportunities in knowledge assessment with concept maps. Finally, it stresses the value that user experience design brings to knowledge assessment with concept maps. [less ▲]

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See detailRESIF 3.0: Toward a Flexible & Automated Management of User Software Environment on HPC facility
Varrette, Sébastien UL; Kieffer, Emmanuel UL; Pinel, Frederic UL et al

in ACM Practice and Experience in Advanced Research Computing (PEARC'21) (2021, July)

HPC is increasingly identified as a strategic asset and enabler to accelerate the research and the business performed in all areas requiring intensive computing and large-scale Big Data analytic ... [more ▼]

HPC is increasingly identified as a strategic asset and enabler to accelerate the research and the business performed in all areas requiring intensive computing and large-scale Big Data analytic capabilities. The efficient exploitation of heterogeneous computing resources featuring different processor architectures and generations, coupled with the eventual presence of GPU accelerators, remains a challenge. The University of Luxembourg operates since 2007 a large academic HPC facility which remains one of the reference implementation within the country and offers a cutting-edge research infrastructure to Luxembourg public research. The HPC support team invests a significant amount of time in providing a software environment optimised for hundreds of users, but the complexity of HPC software was quickly outpacing the capabilities of classical software management tools. Since 2014, our scientific software stack is generated and deployed in an automated and consistent way through the RESIF framework, a wrapper on top of Easybuild and Lmod meant to efficiently handle user software generation. A large code refactoring was performed in 2017 to better handle different software sets and roles across multiple clusters, all piloted through a dedicated control repository. With the advent in 2020 of a new supercomputer featuring a different CPU architecture, and to mitigate the identified limitations of the existing framework, we report in this state-of-practice article RESIF 3.0, the latest iteration of our scientific software management suit now relying on streamline Easybuild. It permitted to reduce by around 90% the number of custom configurations previously enforced by specific Slurm and MPI settings, while sustaining optimised builds coexisting for different dimensions of CPU and GPU architectures. The workflow for contributing back to the Easybuild community was also automated and a current work in progress aims at drastically decrease the building time of a complete software set generation. Overall, most design choices for our wrapper have been motivated by several years of experience in addressing in a flexible and convenient way the heterogeneous needs inherent to an academic environment aiming for research excellence. As the code base is available publicly, and as we wish to transparently report also the pitfalls and difficulties met, this tool may thus help other HPC centres to consolidate their own software management stack. [less ▲]

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See detailSmall in size, great in significance: conspicilla and perspicilla in the visual arts of the Low Countries around 1600
Koeleman, Floor UL

Scientific Conference (2021, July)

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée ... [more ▼]

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée Magnin (Dijon) seems to allude to the implicit link between the two. As tools to observe with and through, these instruments visualize the limits of human perception and the ability to alter the scale of the visible world. The Five Senses was created in Antwerp around the same time the telescope first appeared in textual sources, namely 1608. However, the optical instrument is likely to have existed for years by then. This paper investigates if any references to the telescope in the visual arts predate the first written evidence of its invention. For artists the early telescope was probably not that challenging an object to represent. The exterior, a simple tube characterized by a diaphragm, housed two lenses made by the same glass industry that manufactured eyeglasses. This paper takes a closer look at the imagery of eyeglasses and telescopes, depicted in the visual arts of the late sixteenth and early seventeenth centuries. The meaning assigned to these instruments can be inferred from the context in which they are presented and their relative scale. Together eyeglasses and telescopes feature prominently in constcamer paintings dedicated to visual perception, understood both physically and metaphysically. While the exact date of creation remains subject to debate, The Five Senses probably contains the earliest known depiction of a telescope – true to scale. [less ▲]

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See detailIntelligent Misbehavior Detection System for Detecting False Position Attacks in Vehicular Networks
Hawlader, Faisal UL; Boualouache, Abdelwahab UL; Faye, Sébastien UL et al

in Hawlader, Faisal; Boualouache, Abdelwahab; Faye, Sébastien (Eds.) et al The 2021 IEEE International Conference on Communications (the 4th Workshop on 5G and Beyond Wireless Security) (2021, June)

Position falsification attacks are one of the most dangerous internal attacks in vehicular networks. Several Machine Learning-based Misbehavior Detection Systems (ML-based MDSs) have recently been proposed ... [more ▼]

Position falsification attacks are one of the most dangerous internal attacks in vehicular networks. Several Machine Learning-based Misbehavior Detection Systems (ML-based MDSs) have recently been proposed to detect these attacks and mitigate their impact. However, existing ML-based MDSs require numerous features, which increases the computational time needed to detect attacks. In this context, this paper introduces a novel ML-based MDS for the early detection of position falsification attacks. Based only on received positions, our system provides real-time and accurate predictions. Our system is intensively trained and tested using a publicly available data set, while its validation is done by simulation. Six conventional classification algorithms are applied to estimate and construct the best model based on supervised learning. The results show that the proposed system can detect position falsification attacks with almost 100% accuracy. [less ▲]

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See detailBoys don't cry (or do the dishes): Family size and the housework gender gap
Menta, Giorgia UL; Lepinteur, Anthony UL

in Journal of Economic Behavior and Organization (2021), 186

We here use data from the British Cohort Study (BCS) to link family size to age-16 children’s contribution to household chores and the adult housework gender gap. Assuming that home production is an ... [more ▼]

We here use data from the British Cohort Study (BCS) to link family size to age-16 children’s contribution to household chores and the adult housework gender gap. Assuming that home production is an increasing function of family size and using an instrument to account for the endogeneity of fertility, we show that larger families have a different effect on boys and girls at age 16: girls in large families are significantly more likely to contribute to housework, with no effect for boys. We then show that childhood family size affects the housework gender gap between the cohort members and their partners at age 34. Women who grew up in larger families are more likely to carry out a greater share of household tasks in adulthood, as compared to women from smaller families. In addition, growing up in a large family makes cohort members more likely to sort into households with a wider housework gender gap as adults. We show that the persistent effect of family size is due to the adoption of behaviours in line with traditional gender roles: a lower likelihood of employment and shorter commutes for women, along with a higher employment probability for their partners. [less ▲]

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See detailLocal Meanings of Proportionality
Marketou, Afroditi UL

Book published by Cambridge University Press (2021)

Proportionality increasingly dominates legal imagination. Initially conceived of as a principle that regulates police action, today it is progressively established as an advanced tool of liberal ... [more ▼]

Proportionality increasingly dominates legal imagination. Initially conceived of as a principle that regulates police action, today it is progressively established as an advanced tool of liberal constitutional science. Its spread, accompanied by a global paradigm of constitutional rights, appears to be an irresistible natural development. This thesis was inspired by the intuition that even though courts and lawyers around the world reason more and more in proportionality terms, proportionality can mean very different things in different contexts, even within the same legal system. While the relevant literature has paid little attention to differences in the use of proportionality, identifying the local meanings of proportionality is crucial to making sense of its spread, to assessing its success, and to appraising the possibility of convergence between legal systems. Through an in-depth study and comparison of the use of proportionality by legal actors in France, England and Greece, this work shows that the local meanings of proportionality are not simply deviant applications of a global model. Instead, they reflect the legal cultures in which they evolve, local paths of cultural change and local patterns of Europeanisation. [less ▲]

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See detailChannel Modeling and Analysis of Reconfigurable Intelligent Surfaces Assisted Vehicular Networks
Kong, Long UL; He, Jiguang; Ai, Yun et al

Scientific Conference (2021, June)

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See detailProtection of Personal Data in High Performance Computing Platform for Scientific Research Purposes
Paseri, Ludovica; Varrette, Sébastien UL; Bouvry, Pascal UL

in Proc. of the EU Annual Privacy Forum (APF) 2021 (2021, June)

The Open Science projects are also aimed at strongly encouraging the use of Cloud technologies and High Performance Computing (HPC), for the benefit of European researchers and universities. The emerging ... [more ▼]

The Open Science projects are also aimed at strongly encouraging the use of Cloud technologies and High Performance Computing (HPC), for the benefit of European researchers and universities. The emerging paradigm of Open Science enables an easier access to expert knowledge and material; however, it also raises some challenges regarding the protection of personal data, considering that part of the research data are personal data thus subjected to the EU’s General Data Protection Regulation (GDPR). This paper investigates the concept of scientific research in the field of data protection, with regard both to the European (GDPR) and national (Luxembourg Data Protection Law) legal framework for the compliance of the HPC technology. Therefore, it focuses on a case study, the HPC platform of the University of Luxembourg (ULHPC), to pinpoint the major data protection issues arising from the processing activities through HPC from the perspective of the HPC platform operators. Our study illustrates where the most problematic aspects of compliance lie. In this regard, possible solutions are also suggested, which mainly revolve around (1) standardisation of procedures; (2) cooperation at institutional level; (3) identification of guidelines for common challenges. This research is aimed to support legal researchers in the field of data protection, in order to help deepen the understanding of HPC technology’s challenges and universities and research centres holding an HPC platform for research purposes, which have to address the same issues. [less ▲]

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See detailEnergy Efficiency Optimization Technique for SWIPT-enabled Multi-Group Multicasting Systems with Heterogeneous Users
Gautam, Sumit UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in The international Conference on Acoustics, Speech, & Signal Processing (ICASSP) (2021, June)

We consider a multi-group (MG) multicasting (MC) system wherein a multi-antenna transmitter serves heterogeneous users capable of either information decoding (ID) or energy harvesting (EH), or both. In ... [more ▼]

We consider a multi-group (MG) multicasting (MC) system wherein a multi-antenna transmitter serves heterogeneous users capable of either information decoding (ID) or energy harvesting (EH), or both. In this context, we investigate a precoder design framework to explicitly serve the ID and EH users categorized within certain MC and EH groups. Specifically, the ID users are categorized within multiple MC groups while the EH users are a part of single (last) group. We formulate a problem to optimize the energy efficiency in the considered scenario under a quality-of-service (QoS) constraint. An algorithm based on Dinkelback method, slack-variable replacement, and second-order conic programming (SOCP)/semi-definite relaxation (SDR) is proposed to obtain a suitable solution for the above-mentioned fractional-objective dependent non-convex problem. Simulation results illustrate the benefits of proposed algorithm under several operating conditions and parameter values, while drawing a comparison between the two proposed methods. [less ▲]

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See detailA design strategy for phase synchronization in Precoding-enabled DVB-S2X user terminals
Martinez Marrero, Liz UL; Merlano Duncan, Juan Carlos UL; Querol, Jorge UL et al

Scientific Conference (2021, June)

This paper address the design of a phase tracking block for the DVB-S2X user terminals in a satellite precoding system. The spectral characteristics of the phase noise introduced by the oscillator, the ... [more ▼]

This paper address the design of a phase tracking block for the DVB-S2X user terminals in a satellite precoding system. The spectral characteristics of the phase noise introduced by the oscillator, the channel, and the thermal noise at the receiver are taken into account. Using the expected phase noise mask, the optimal parameters for a second-order PLL intended to track channel variations from the pilots are calculated. To validate the results a Simulink model was implemented considering the characteristics of the hardware prototype. The performance of the design was evaluated in terms of the accuracy and stability for the frame structure of superframe Format 2, as described in Annex E of DVB-S2X. [less ▲]

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See detailDemocracy, Freedom and Truth at a Time of Digital Disruption: An equation with three unknowns?
Danescu, Elena UL

in Višňovský, Ján; Radošinská (Eds.) Fake News Is Bad News - Hoaxes, Half-truths and the Nature of Today's Journalism (2021)

The pattern of a knowledge-based society relies to a large extent on digital technologies and intangible outputs and generate considerable transnational financial flows and gains. These technologies also ... [more ▼]

The pattern of a knowledge-based society relies to a large extent on digital technologies and intangible outputs and generate considerable transnational financial flows and gains. These technologies also play a key role in providing free access to data and information, encouraging citizen participation in public decision-making, fostering transparency and scrutiny of government action and mobilising new players capable of identifying alternative means of civic and political participation worldwide. At the same time, the increasingly impact of online platforms in manipulating transnational public debates, and the surge in extremist groups using the digital ecosystem to incite hatred, hostility and violence are a warning sign that these modes of communication may be having an adverse effect on democracy and that the boundary between fact and fiction is not as clear as we may like to think. The US presidential election campaign and the Brexit referendum (2016), the theories about COVID-19 (that have flooded the web since 2019), the terrorist attack against French teacher Samuel Paty (16 October 2020) all highlight these trends. When the majority of the world’s citizens are using online media as their main source of information, the proliferation of disinformation and the related threat of radicalism and extremism have led to a growing awareness of these issues at international- and European Union level. What can be done to tackle the situation? How should the democratic states with new forms of private power in the algorithmic society? Where should the line be drawn between freedom of expression and media pluralism on the one hand, and intrusion and censorship of dissenting opinions on the other? How should information be defended as a fundamental right? Is there a moral or ethical code when it comes to information? How can be created an environment that is conducive to inclusive, pluralistic public debate? How to equip citizens to develop a critical approach and to take informed decisions? How to balance innovation with the need to ensure transparency and fairness? Could we be witnessing a situation in which algorithms are “dissolving” democracy? Drawing on the archives of the international and European multilateral organisations (UN/UNESCO, Council of Europe, the Organisation for Security and Cooperation in Europe, the European Union) and several public and private stakeholders worldwide, this chapter proposes: a) to take stock of the issues and challenges raised by the proliferation of fake news, social media and algorithms, and their impact on freedom and democracy; b) to review the regulatory provisions implemented in this area at European and international level; and c) to identify future prospects. [less ▲]

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See detailTable ronde : comment faire réseau autour des archives du web ?
Schafer, Valerie UL

Scientific Conference (2021, May 17)

Table ronde : comment faire réseau autour des archives du web ? Intervenants : Emmanuelle Bermès (Bibliothèque nationale de France), Dominique Cardon (medialab, Sciences Po), Stéphanie Groudiev (Campus ... [more ▼]

Table ronde : comment faire réseau autour des archives du web ? Intervenants : Emmanuelle Bermès (Bibliothèque nationale de France), Dominique Cardon (medialab, Sciences Po), Stéphanie Groudiev (Campus Condorcet), Valérie Schafer (Université du Luxembourg) [less ▲]

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See detailLuxemburg und der Zweite Weltkrieg: Über den nationalen Tellerrand hinausschauen
Brüll, Christoph UL

Article for general public (2021)

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See detailMonolingual cringe and ideologies of English: Anglophone migrants to Luxembourg draw their experiences in a multilingual society
de Bres, Julia; Lovrits, Veronika UL

in Journal of Multilingual and Multicultural Development (2021)

This article uses reflective drawing to explore representations of multilingualism by Anglophone migrants in Luxembourg. Analysing twelve interviews in which participants drew and described their language ... [more ▼]

This article uses reflective drawing to explore representations of multilingualism by Anglophone migrants in Luxembourg. Analysing twelve interviews in which participants drew and described their language experiences, we examine the language ideologies Anglophone migrants adopt in response to the ideologies of English they encounter. Participants adopt various ideologies, sometimes aligning with the ideology of global English, sometimes with counter-ideologies of resistance to it, and sometimes a mix of the two. Visual features indexing affective states include colour, gesture, facial expression, and composition. Monolingual cringe – expressed as shame, embarrassment and being ‘bad at languages’ – performs several functions for the participants. Sometimes it serves as an affective disclaimer, allowing them to lean on their privilege in a more socially acceptable way. Sometimes it appears to express genuine distress, in the form of searing linguistic insecurity. Sometimes it performs a distancing function, enabling them to oppose themselves to the stereotype of the monolingual English speaker. The affective intensity of the drawings suggests the ideology of global English does have costs for Anglophone migrants. Fundamentally, though, monolingual cringe reinforces privilege, allowing participants to apologise for their monolingualism even as they continue to benefit from it. [less ▲]

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See detail„Place de l’Etoile“/Stäreplaz. Goldgrube mit grünen Dächern
Hesse, Markus UL

Article for general public (2021)

Stadt ist Markt. Der Warentausch war, neben Militär und Kirche, immer ein wichtiges Movens von Stadtgründung und -entwicklung. Will man die heutigen Konsumlandschaften reflektieren, muss man am Konsum von ... [more ▼]

Stadt ist Markt. Der Warentausch war, neben Militär und Kirche, immer ein wichtiges Movens von Stadtgründung und -entwicklung. Will man die heutigen Konsumlandschaften reflektieren, muss man am Konsum von Grund und Boden ansetzen. Solch ein Blick erklärt, in welche Richtung sich viele Städte gegenwärtig und zukünftig entwickeln werden. [less ▲]

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See detailMultiple vulnerabilities: The effects of neighborhood structural changes upon older residents' mental health and perceptions of the broader community
Settels, Jason UL

Scientific Conference (2021, May 06)

Aims: Neighborhoods’ structural conditions are consequential for their social circumstances and residents’ well-being. Neighborhood effects might be accentuated among older residents because their daily ... [more ▼]

Aims: Neighborhoods’ structural conditions are consequential for their social circumstances and residents’ well-being. Neighborhood effects might be accentuated among older residents because their daily activities and social lives are more confined to their immediate communities. This study examines how changing neighborhood socioeconomic disadvantage affects older residents’ depression and stress, as well as perceptions of neighborhood context. Methods: This study employed waves 2 (2010-2011) and 3 (2015-2016) of the National Social Life, Health, and Aging Project survey (N=2,357) and fixed-effects linear regression models to study these relationships. Results: While rising neighborhood socioeconomic disadvantage was associated with more depression and stress, it was negatively associated with overall neighborhood social capital and neighborhood social cohesion, and was only associated with lower perceptions of neighborhood safety among respondents who relocated to new neighborhoods. Conclusions: Beyond cross-sectional associations, changing neighborhood socioeconomic disadvantage is associated with changes in mental health and perceptions of neighborhood social context. [less ▲]

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See detailHagiography in the Digital Age. New Perspectives on Latin Legendaries
Dubuisson, Bastien UL; de Valeriola, Sébastien

Presentation (2021, May 06)

La dernière décennie du 20e siècle fut marquée par la mise en place d’un outil devenu indispensable aux historiens qui étudient l’hagiographie latine d’avant 1500 et qui s’intéressent à ses vecteurs ... [more ▼]

La dernière décennie du 20e siècle fut marquée par la mise en place d’un outil devenu indispensable aux historiens qui étudient l’hagiographie latine d’avant 1500 et qui s’intéressent à ses vecteurs manuscrits. Née de l’initiative visionnaire de Guy Philippart et de son équipe, ainsi que d’une collaboration avec la Société des Bollandistes, la base de données BHLms entendait rendre la Bibliotheca Hagiographica Latina et ses Supplementa, couplés à l’ensemble des catalogues de manuscrits hagiographiques bollandiens, instantanément interrogeables . Deux décennies plus tard, le projet est toujours vivace et s’apprête à connaître une seconde vie sur les serveurs de l’Institut de Recherche et d’Histoire des Textes . Cependant, si les informations collectées, présentées sous la forme d’une interface graphique, permettent à tout utilisateur d’obtenir rapidement des renseignements sur un texte donné (identifié par un n° BHL) et les manuscrits qui le contiennent, les données brutes de la base n’avaient à ce jour jamais été exploitées de façon globale. C’est une analyse de ce genre que nous proposons ici, par le biais de méthodes quantitatives, et notamment d’outils d’apprentissage automatique (machine learning) . Pour ce faire, nous embrassons deux approches, qui considèrent la base de données globales sous deux angles de vue différents. D’une part, nous enquêtons sur le degré de similarité entre les manuscrits sur la base de leur contenu, à l’aide de techniques de partitionnement (clustering). D’autre part, nous étudions les relations qu’entretiennent entre eux les saints par le truchement de méthodes de fouille de règles d’association (rule mining) et de théorie des graphes. Si le but final de notre analyse est bel et bien d’appliquer ces méthodes à l’ensemble de la base, nous aborderons dans un premier temps un cas d’étude concret, celui des manuscrits hagiographiques et des saints de l’ancien diocèse de Trèves. Les résultats de l’analyse quantitative peuvent ainsi être confrontés aux conclusions qualitatives obtenues par l’historiographie. [less ▲]

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See detailFinancial Difficulties and Gender as Moderators of How Workforce Involvement and Transitions Affect the Health of Older Europeans
Settels, Jason UL

Poster (2021, May 05)

A prominent demographic trend throughout the industrialized world is population aging. In response to concerns about labor force shortages, many European nations have enacted policies aimed at keeping ... [more ▼]

A prominent demographic trend throughout the industrialized world is population aging. In response to concerns about labor force shortages, many European nations have enacted policies aimed at keeping older persons employed. Understanding how later life paid work is associated with health is thus important. Using an older sample from waves six and seven of the Survey of Health, Ageing and Retirement in Europe (N = 38,884), this study shows how a set of six workforce involvement/transitions patterns are associated with health. Also studied are whether these effects are moderated by financial difficulties. Later life paid work is found to be beneficial for health, and this benefit is accentuated by financial difficulties. The findings also reveal moderation by gender. Older women’s more fragmented employment histories cause stable paid work to be of less benefit for addressing their financial difficulties. Furthermore, older women are especially vulnerable to unemployment while undergoing financial troubles. [less ▲]

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