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See detailAutomatic Test Suite Generation for Key-points Detection DNNs Using Many-Objective Search
Ul Haq, Fitash UL; Shin, Donghwan UL; Briand, Lionel UL et al

in 2021 ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA) (in press)

Automatically detecting the positions of key-points (e.g., facial key-points or finger key-points) in an image is an essential problem in many applications, such as driver's gaze detection and drowsiness ... [more ▼]

Automatically detecting the positions of key-points (e.g., facial key-points or finger key-points) in an image is an essential problem in many applications, such as driver's gaze detection and drowsiness detection in automated driving systems. With the recent advances of Deep Neural Networks (DNNs), Key-Points detection DNNs (KP-DNNs) have been increasingly employed for that purpose. Nevertheless, KP-DNN testing and validation have remained a challenging problem because KP-DNNs predict many independent key-points at the same time---where each individual key-point may be critical in the targeted application---and images can vary a great deal according to many factors. In this paper, we present an approach to automatically generate test data for KP-DNNs using many-objective search. In our experiments, focused on facial key-points detection DNNs developed for an industrial automotive application, we show that our approach can generate test suites to severely mispredict, on average, more than 93% of all key-points. In comparison, random search-based test data generation can only severely mispredict 41% of them. Many of these mispredictions, however, are not avoidable and should not therefore be considered failures. We also empirically compare state-of-the-art, many-objective search algorithms and their variants, tailored for test suite generation. Furthermore, we investigate and demonstrate how to learn specific conditions, based on image characteristics (e.g., head posture and skin color), that lead to severe mispredictions. Such conditions serve as a basis for risk analysis or DNN retraining. [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 detailUpdate Internationales und Europäisches Steuerrecht
Sinnig, Julia UL

in Taeger, Jürgen (Ed.) Tagungsband DSRI-Herbstakademie 2020 (in press)

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle ... [more ▼]

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle, der in einer Veröffentlichung im Januar 2020 vorgestellt wurde. Auf Ebene der Europäischen Union gab es im Berichtszeitraum keine Weiterent-wicklung der Richtlinienvorschläge zu einer Digitalsteuer und dem Konzept der „signifi-kanten digitalen Präsenz“. Der EuGH urteilte am 3. März 2020 in Hinblick auf die unions-rechtliche Vereinbarkeit zweier ungarischer Umsatzsteuern. Dieses Urteil erlaubt erste Rückschlüsse bezüglich der Europarechtskonformität umsatzbasierter Steuern, wie bspw. auch im Berichtszeitraum eingeführte Digitalsteuern einzelner Mitgliedstaaten. Dieser Beitrag knüpft an die Vorträge von Prof. Dr. Jens M. Schmittmann und der Verfasserin anlässlich der Herbstakademien 2018 in Bochum und 2019 in Oldenburg, sowie dem Vortrag der Verfasserin anlässlich der Herbstakademie 2017 in Heidelberg an. [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 detailDigital Twins Are Not Monozygotic -- Cross-Replicating ADAS Testing in Two Industry-Grade Automotive Simulators
Borg, Markus; Ben Abdessalem (helali), Raja UL; Nejati, Shiva UL et al

in 2021 IEEE 14th International Conference on Software Testing, Validation and Verification (ICST) (in press)

The increasing levels of software- and data-intensive driving automation call for an evolution of automotive software testing. As a recommended practice of the Verification and Validation (V&V) process of ... [more ▼]

The increasing levels of software- and data-intensive driving automation call for an evolution of automotive software testing. As a recommended practice of the Verification and Validation (V&V) process of ISO/PAS 21448, a candidate standard for safety of the intended functionality for road vehicles, simulation-based testing has the potential to reduce both risks and costs. There is a growing body of research on devising test automation techniques using simulators for Advanced Driver-Assistance Systems (ADAS). However, how similar are the results if the same test scenarios are executed in different simulators? We conduct a replication study of applying a Search-Based Software Testing (SBST) solution to a real-world ADAS (PeVi, a pedestrian vision detection system) using two different commercial simulators, namely, TASS/Siemens PreScan and ESI Pro-SiVIC. Based on a minimalistic scene, we compare critical test scenarios generated using our SBST solution in these two simulators. We show that SBST can be used to effectively and efficiently generate critical test scenarios in both simulators, and the test results obtained from the two simulators can reveal several weaknesses of the ADAS under test. However, executing the same test scenarios in the two simulators leads to notable differences in the details of the test outputs, in particular, related to (1) safety violations revealed by tests, and (2) dynamics of cars and pedestrians. Based on our findings, we recommend future V&V plans to include multiple simulators to support robust simulation-based testing and to base test objectives on measures that are less dependant on the internals of the simulators. [less ▲]

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See detailRoboMAX: Robotic Mission Adaptation eXemplars
Askarpour, Mehrnoosh; Tsigkanos, Christos; Menghi, Claudio UL et al

in Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS) - Artifact Track (in press)

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic ... [more ▼]

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic mission adaptation exemplars. Co-designed with robotic application stakeholders including researchers, developers, operators, and end-users, our repository captures key sources of uncertainty, adaptation concerns, and other distinguishing characteristics of such applications. An online form enables external parties to supply new exemplars for curation and inclusion into the repository. We envisage that our RoboMAX repository will enable the development, evaluation, and comparison of much-needed self-adaptation approaches for the robotic systems domain. [less ▲]

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See detailAvoiding bias when inferring race using name-based approaches
Kozlowski, Diego UL; Murray, Dakota S.; Bell, Alexis et al

Scientific Conference (in press)

Racial disparity in academia is a widely acknowledged problem. The quantitative understanding of racial-based systemic inequalities is an important step towards a more equitable research system. However ... [more ▼]

Racial disparity in academia is a widely acknowledged problem. The quantitative understanding of racial-based systemic inequalities is an important step towards a more equitable research system. However, few large-scale analyses have been performed on this topic, mostly because of the lack of robust race-disambiguation algorithms. Identifying author information does not generally include the author’s race. Therefore, an algorithm needs to be employed, using known information about authors, i.e., their names, to infer their perceived race. Nevertheless, as any other algorithm, the process of racial inference can generate biases if it is not carefully considered. When the research is focused on the understanding of racial-based inequalities, such biases undermine the objectives of the investigation and may perpetuate inequities. The goal of this article is to assess the biases introduced by the different approaches used name-based racial inference. We use information from US census and mortgage applications to infer the race of US author names in the Web of Science. We estimate the effects of using given and family names, thresholds or continuous distributions, and imputation. Our results demonstrate that the validity of name-based inference varies by race and ethnicity and that threshold approaches underestimate Black authors and overestimate White authors. We conclude with recommendations to avoid potential biases. This article fills an important research gap that will allow more systematic and unbiased studies on racial disparity in science. [less ▲]

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See detailA Comparison of Pre-Trained Language Models for Multi-Class Text Classification in the Financial Domain
Arslan, Yusuf UL; Allix, Kevin UL; Veiber, Lisa UL et al

in Companion Proceedings of the Web Conference 2021 (WWW '21 Companion), April 19--23, 2021, Ljubljana, Slovenia (in press)

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See detailDe la naissance de l’État luxembourgeois. Analyse et historique de la problématique
Heuschling, Luc UL

in Actes de la Section des sciences morales et politiques, Institut grand-ducal (in press)

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See detailDatenbank für Zweisprachige Historische Luxemburgische Bekanntmachungen
Gilles, Peter UL; Ziegler, Evelyn

in Wallmeier, Nadine; Tophinke, Doris (Eds.) Historische Stadtsprachenforschung (in press)

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See detailThe legacy of coal mining – a view on examples in Belgium and France
Helfer, Malte UL

in Deutsches Bergbau-Museum Bochum (Ed.) Boom – Crisis – Heritage. King Coal and Energy Revolutions after 1945; proceedings of the international conference March 14th-16th 2018, Technische Hochschule Georg Agricola, Bochum (in press)

Following the end of coalmining in Belgium (1992) and France (2004), the year 2018 marks the end of hard coal mining in Germany as well. This contribution looks at the legacy of coalmining of Germany’s ... [more ▼]

Following the end of coalmining in Belgium (1992) and France (2004), the year 2018 marks the end of hard coal mining in Germany as well. This contribution looks at the legacy of coalmining of Germany’s French-speaking neighbours and presents the most important remaining coal mining heritage sites as well as some extraordinary converted sites in France and the Belgian province Wallonia. [less ▲]

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See detailLog-based Slicing for System-level Test Cases
Messaoudi, Salma UL; Shin, Donghwan UL; Panichella, Annibale et al

in 2021 ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA) (in press)

Regression testing is arguably one of the most important activities in software testing. However, its cost-effectiveness and usefulness can be largely impaired by complex system test cases that are poorly ... [more ▼]

Regression testing is arguably one of the most important activities in software testing. However, its cost-effectiveness and usefulness can be largely impaired by complex system test cases that are poorly designed (e.g., test cases containing multiple test scenarios combined into a single test case) and that require a large amount of time and resources to run. One way to mitigate this issue is decomposing such system test cases into smaller, separate test cases---each of them with only one test scenario and with its corresponding assertions---so that the execution time of the decomposed test cases is lower than the original test cases, while the test effectiveness of the original test cases is preserved. This decomposition can be achieved with program slicing techniques, since test cases are software programs too. However, existing static and dynamic slicing techniques exhibit limitations when (1) the test cases use external resources, (2) code instrumentation is not a viable option, and (3) test execution is expensive. In this paper, we propose a novel approach, called DS3 (Decomposing System teSt caSe), which automatically decomposes a complex system test case into separate test case slices. The idea is to use test case execution logs, obtained from past regression testing sessions, to identify "hidden" dependencies in the slices generated by static slicing. Since logs include run-time information about the system under test, we can use them to extract access and usage of global resources and refine the slices generated by static slicing. We evaluated DS3 in terms of slicing effectiveness and compared it with a vanilla static slicing tool. We also compared the slices obtained by DS3 with the corresponding original system test cases, in terms of test efficiency and effectiveness. The evaluation results on one proprietary system and one open-source system show that DS3 is able to accurately identify the dependencies related to the usage of global resources, which vanilla static slicing misses. Moreover, the generated test case slices are, on average, 3.56 times faster than original system test cases and they exhibit no significant loss in terms of fault detection effectiveness. [less ▲]

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See detailLes transformations d'un recueil hagiographique monumental: le grand légendier de Saint-Maximin de Trèves aux XVe-XVIe siècles
Dubuisson, Bastien UL

in Peloux, Fernand (Ed.) Des saints et des livres: Christianisme flamboyant et manuscrits hagiographiques du Nord à la fin du Moyen Âge (XIIIe-XVIe siècles) (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 detailUsing Passive Data Collection Methods to Learn Complex Mobility Patterns: An Exploratory Analysis
Toader, Bogdan UL; Cantelmo, Guido UL; Popescu, Mioara et al

Scientific Conference (in press)

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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 detailLSPnet: A 2D Localization-oriented Spacecraft Pose Estimation Neural Network
Garcia Sanchez, Albert UL; Mohamed Ali, Mohamed Adel UL; Gaudilliere, Vincent UL et al

in Conference on Computer Vision and Pattern Recognition Workshops. Proceedings (in press)

Being capable of estimating the pose of uncooperative objects in space has been proposed as a key asset for enabling safe close-proximity operations such as space rendezvous, in-orbit servicing and active ... [more ▼]

Being capable of estimating the pose of uncooperative objects in space has been proposed as a key asset for enabling safe close-proximity operations such as space rendezvous, in-orbit servicing and active debris removal. Usual approaches for pose estimation involve classical computer vision-based solutions or the application of Deep Learning (DL) techniques. This work explores a novel DL-based methodology, using Convolutional Neural Networks (CNNs), for estimating the pose of uncooperative spacecrafts. Contrary to other approaches, the proposed CNN directly regresses poses without needing any prior 3D information. Moreover, bounding boxes of the spacecraft in the image are predicted in a simple, yet efficient manner. The performed experiments show how this work competes with the state-of-the-art in uncooperative spacecraft pose estimation, including works which require 3D information as well as works which predict bounding boxes through sophisticated CNNs. [less ▲]

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See detailBuffer XDEM
Mainassara Chekaraou, Abdoul Wahid UL; Besseron, Xavier UL; Rousset, Alban UL et al

Scientific Conference (in press)

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See detailLa Charte dans l'action extérieure de l'Union européenne
Neframi, Eleftheria UL

in Iliopoulou Penot, Anastasia; Xenou, Lamprini (Eds.) La Charte des droits fondamentaux de l'UE (in press)

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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 detailStudent Response Systems in Remote Teaching
Botev, Jean UL; Grevisse, Christian UL; Rothkugel, Steffen UL

in Proceedings of the 23rd International Conference on Human-Computer Interaction (HCI International) (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 detailVirtual Agent Representation for Critical Transactions
Sun, Ningyuan UL; Botev, Jean UL

in Proceedings of the 12th ACM Multimedia Systems Conference (MMSys) (in press)

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See detailWhich Properties has an Icon? A Critical Discussion on Evaluation Methods for Standardised Data Protection Iconography
Rossi, Arianna UL; Lenzini, Gabriele UL

in Proceedings of the 8th Workshop on Socio-Technical Aspects in Security and Trust (STAST) (in press)

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this ... [more ▼]

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this paper, we firstly critically review some of those proposals. We then examine the properties that icons and icon sets should arguably fulfill according to Art.12's transparency provisions. Lastly, we discuss metrics and evaluation procedures to measure compliance with the Article. [less ▲]

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See detailProcess analysis in thermal process engineering with high-performance computing using the example of grate firing
Peters, Bernhard UL; Rousset, Alban UL; Besseron, Xavier UL et al

in 12th European Conference on Industrial Furnaces and Boilers (in press)

Biomass as a renewable energy source continues to grow in popularity to reduce fossil fuel consumption for environmental and economic benefits. In the present contribution, the combustion chamber of a 16 ... [more ▼]

Biomass as a renewable energy source continues to grow in popularity to reduce fossil fuel consumption for environmental and economic benefits. In the present contribution, the combustion chamber of a 16 MW geothermal steam super-heater, which is part of the Enel Green Power "Cornia 2" power plant, is being investigated with high-performance computing methods. For this purpose, the extended discrete element method (XDEM) developed at the University of Luxembourg is used in a high-performance computing environment, which includes both the moving wooden bed and the combustion chamber above it. The XDEM simulation platform is based on a hybrid four-way coupling between the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD). In this approach, particles are treated as discrete elements that are coupled by heat, mass, and momentum transfer to the surrounding gas as a continuous phase. For individual wood particles, besides the equations of motion, the differential conservation equations for mass, heat, and momentum are solved, which describe the thermodynamic state during thermal conversion. The consistency of the numerical results with the actual system performance is discussed in this paper to determine the potentials and limitations of the approach. [less ▲]

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See detailPrimauté et droits fondamentaux: une question de compétences?
Neframi, Eleftheria UL

in Gaudin, Hélène (Ed.) Primauté et clause la plus protectrice: le renouveau des droits fondamentaux en Europe (in press)

Dans le rapport entre le principe de primauté et la protection des droits fondamentaux la question de la répartition des compétences ne semble pas, à première vue, se poser : la primauté nous place dans ... [more ▼]

Dans le rapport entre le principe de primauté et la protection des droits fondamentaux la question de la répartition des compétences ne semble pas, à première vue, se poser : la primauté nous place dans la sphère de compétence de l’Union, alors que la protection des droits fondamentaux, comme contestation de la primauté, relève de la sphère nationale. Le conflit entre primauté et droits fondamentaux relève ainsi du rapport des ordres juridiques et est résolu par leur interaction, exprimée dans la balance entre le principe de coopération loyale et la prise en compte des intérêts nationaux, sur la base du respect de l’identité nationale ou en invoquant l’article 53 de la Charte . En ce sens, la problématique des compétences n’entre pas en ligne de compte. Cependant, l’élaboration de standards européens de protection des droits fondamentaux, en tant qu’objet direct ou indirect de l’exercice des compétences de l’Union, peut servir le compromis issu du principe d’attribution. Ainsi, primauté et droits fondamentaux peuvent être abordés sous l’angle des compétences. Le rapport entre primauté et droits fondamentaux n’est toutefois pas forcément conflictuel. La Charte est source d’obligations pour les Etats membres au-delà du champ couvert par l’exercice des compétences de l’Union. Il est bien établi que la notion de mise en œuvre du droit de l’Union en tant que condition de l’application de la Charte à l’égard des Etats membres, est entendue dans le sens du domaine couvert par le droit de l’Union. Ainsi, les standards européens de protection sont eux-mêmes couverts par la primauté et interviennent dans l’encadrement de l’autonomie nationale et l’articulation des compétences [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 detailGoal-Directed Decision Procedures for Input/Output Logics
Steen, Alexander UL

in Marra, Alessandra; Liu, Fenrong; Portner, Paul (Eds.) et al Deontic Logic and Normative Systems: 15th International Conference (DEON2020/2021, Munich) (in press)

Input/Output (I/O) logics address the abstract study of conditional norms. Here, norms are represented as pairs of formulas instead of statements that themselves carry truth-values. I/O logics have been ... [more ▼]

Input/Output (I/O) logics address the abstract study of conditional norms. Here, norms are represented as pairs of formulas instead of statements that themselves carry truth-values. I/O logics have been studied thoroughly in the past, including further applications and refinements. In this paper, a class of automated reasoning procedures is presented that, given a set of norms and a concrete situation, decide whether a specific state of affairs is obligatory according to the output operations of I/O logics. The procedures are parametric in the underlying logical formalism and can be instantiated with different classical objects logics, such as propositional logic or first-order logic. The procedures are shown to be correct, and a proof-of-concept implementation for propositional I/O logics is surveyed. [less ▲]

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See detailTrace-Checking CPS Properties: Bridging the Cyber-Physical Gap
Menghi, Claudio UL; Vigano, Enrico UL; Bianculli, Domenico UL et al

in Proceedings of the 43rd International Conference on Software Engineering (ICSE 2021) (in press)

Cyber-physical systems combine software and physical components. Specification-driven trace-checking tools for CPS usually provide users with a specification language to express the requirements of ... [more ▼]

Cyber-physical systems combine software and physical components. Specification-driven trace-checking tools for CPS usually provide users with a specification language to express the requirements of interest, and an automatic procedure to check whether these requirements hold on the execution traces of a CPS. Although there exist several specification languages for CPS, they are often not sufficiently expressive to allow the specification of complex CPS properties related to the software and the physical components and their interactions. In this paper, we propose (i) the Hybrid Logic of Signals (HLS), a logic-based language that allows the specification of complex CPS requirements, and (ii) ThEodorE, an efficient SMT-based trace-checking procedure. This procedure reduces the problem of checking a CPS requirement over an execution trace, to checking the satisfiability of an SMT formula. We evaluated our contributions by using a representative industrial case study in the satellite domain. We assessed the expressiveness of HLS by considering 212 requirements of our case study. HLS could express all the 212 requirements. We also assessed the applicability of ThEodorE by running the trace-checking procedure for 747 trace-requirement combinations. ThEodorE was able to produce a verdict in 74.5% of the cases. Finally, we compared HLS and ThEodorE with other specification languages and trace-checking tools from the literature. Our results show that, from a practical standpoint, our approach offers a better trade-off between expressiveness and performance. [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)

Detailed reference viewed: 103 (15 UL)
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 detailExternalisation de la politique migratoire et identité de l'Union européenne
Neframi, Eleftheria UL; Gatti, Mauro UL

in Benlolo, Myriam (Ed.) L'Union européenne et les migrations (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 detailConFuzzius: A Data Dependency-Aware Hybrid Fuzzer for Smart Contracts
Ferreira Torres, Christof UL; Iannillo, Antonio Ken UL; Gervais, Arthur et al

in European Symposium on Security and Privacy, Vienna 7-11 September 2021 (2021, September)

Smart contracts are Turing-complete programs that are executed across a blockchain. Unlike traditional programs, once deployed, they cannot be modified. As smart contracts carry more value, they become ... [more ▼]

Smart contracts are Turing-complete programs that are executed across a blockchain. Unlike traditional programs, once deployed, they cannot be modified. As smart contracts carry more value, they become more of an exciting target for attackers. Over the last years, they suffered from exploits costing millions of dollars due to simple programming mistakes. As a result, a variety of tools for detecting bugs have been proposed. Most of these tools rely on symbolic execution, which may yield false positives due to over-approximation. Recently, many fuzzers have been proposed to detect bugs in smart contracts. However, these tend to be more effective in finding shallow bugs and less effective in finding bugs that lie deep in the execution, therefore achieving low code coverage and many false negatives. An alternative that has proven to achieve good results in traditional programs is hybrid fuzzing, a combination of symbolic execution and fuzzing. In this work, we study hybrid fuzzing on smart contracts and present ConFuzzius, the first hybrid fuzzer for smart contracts. ConFuzzius uses evolutionary fuzzing to exercise shallow parts of a smart contract and constraint solving to generate inputs that satisfy complex conditions that prevent evolutionary fuzzing from exploring deeper parts. Moreover, ConFuzzius leverages dynamic data dependency analysis to efficiently generate sequences of transactions that are more likely to result in contract states in which bugs may be hidden. We evaluate the effectiveness of ConFuzzius by comparing it with state-of-the-art symbolic execution tools and fuzzers for smart contracts. Our evaluation on a curated dataset of 128 contracts and a dataset of 21K real-world contracts shows that our hybrid approach detects more bugs than state-of-the-art tools (up to 23%) and that it outperforms existing tools in terms of code coverage (up to 69%). We also demonstrate that data dependency analysis can boost bug detection up to 18%. [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 detailMeasuring multicultural ideology: Scale development and validation in different languages and contexts
Stogianni, Maria UL; Schmidt, Lea Marie; Murdock, Elke UL et al

Scientific Conference (2021, July)

Increased migration has led to the formation of culturally diverse societies in many places around the world. The concept of Multicultural Ideology incorporates two values as a way to promote positive ... [more ▼]

Increased migration has led to the formation of culturally diverse societies in many places around the world. The concept of Multicultural Ideology incorporates two values as a way to promote positive intercultural relations: a) Diversity: the presence of ethnocultural diversity in the population and b) Equity: the right for equal participation of all cultural groups in the society. Both diversity and equity are necessary conditions for the success of multicultural policies. Culturally heterogeneous communities that do not support inclusion and equitable participation of all groups face the negative consequences of segregation and marginalization. In line with this notion, an international research consortium is developing a revised version of the Multicultural Ideology Scale to assess the endorsement of multicultural ideology in different national contexts. The scale aims to distinguish various attitudinal dimensions of multiculturalism, relevant to the acceptance of diversity and social inclusion of different ethnocultural groups: Cultural Maintenance, Social Interaction, Equity/Inclusion, Extent of Differences, Conflictual Relations, Essentialistic Boundaries. We present the first assessment of the new scale in the German language. The survey was administered online to a sample of native German citizens (N = 382) with different demographic characteristics. Our aim was to understand the attitude of native citizens towards cultural diversity and their willingness to have members of ethnic minority groups be included in the larger society. We investigated the factor structure of the scale, its psychometric properties, and the relationship between multicultural ideology and some individual difference variables, such as ethnic group attachment and social dominance orientation. [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 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 detailThinking Borders and Border Thinking
Wille, Christian UL

Scientific Conference (2021, June 17)

Obwohl die Grenz- und Migrationsforschung große Überschneidungen aufweisen, unterscheiden sie sich z.B. hinsichtlich ihrer Erkenntnisinteressen und Theoretisierungen. Der Vortrag baut auf solchen ... [more ▼]

Obwohl die Grenz- und Migrationsforschung große Überschneidungen aufweisen, unterscheiden sie sich z.B. hinsichtlich ihrer Erkenntnisinteressen und Theoretisierungen. Der Vortrag baut auf solchen Gemeinsamkeiten und Unterschieden auf und zeigt zunächst die Verbindungen zwischen Grenz- und Migrationsforschung. Im zweiten Schritt werden aus Sicht der Grenzforschung verschiedene analytische Trends – insbesondere die komplexitätsorientierte Perspektive – und die damit verbundenen Grenzkonzepte vorgestellt. Abschließend werden die analytischen Trends mit der Methode „border thinking“ (Mignolo) in Zusammenhang gebracht und gefragt, inwiefern sie für die Migrationsforschung nützlich sein können. [less ▲]

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See detailScaling of urban heat island and nitrogen dioxide with urban population: a meta-analysis
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2021, June 10)

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See detailReplicating the Kinora: 3D modelling and printing as heuristics in digital media history
van der Heijden, Tim UL; Wolf, Claude UL

Scientific Conference (2021, June 02)

This presentation reflects on the Kinora replica project, an interdisciplinary collaboration between the Luxembourg Centre for Contemporary and Digital History (C2DH) and the Department of Engineering ... [more ▼]

This presentation reflects on the Kinora replica project, an interdisciplinary collaboration between the Luxembourg Centre for Contemporary and Digital History (C2DH) and the Department of Engineering (DoE) of the University of Luxembourg. Combining historical inquiry with a hands-on and technical approach – involving the latest 3D modelling and desktop additive manufacturing engineering techniques – it provides insights into the process of making a working replica of the Kinora motion picture technology from the early 1900s. [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 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 detailAn Age-Of-Information Perspective on Decentralized Congestion Control in Vehicular Networks
Turcanu, Ion UL; Baiocchi, Andrea; Lyamin, Nikita et al

in 19th Mediterranean Communication and Computer Networking Conference, Online Conference, 15-17 June 2021 (2021, June)

Vehicular networking enables a wide range of emerging Cooperative Intelligent Transportation System (C-ITS) applications, from safety to traffic efficiency and infotainment. Many of these applications ... [more ▼]

Vehicular networking enables a wide range of emerging Cooperative Intelligent Transportation System (C-ITS) applications, from safety to traffic efficiency and infotainment. Many of these applications depend on the reliability and timeliness of status information periodically exchanged among vehicles on the same wireless communication channel. A major effort has been spent, especially by standardization bodies, to define congestion control algorithms for the vehicular networking environment. The picture is, however, more complex than simply controlling the load level on the channel, given the non-trivial interplay of delivery reliability, system throughput, and timeliness of updates. In this paper, we provide a comprehensive performance evaluation of the main state-of- the-art broadcast rate control algorithms from the point of view of channel load, utilization efficiency, and information freshness. We evaluate these algorithms in a realistic simulation environment and describe a centralized approach to define a bound on the performance. We show that controlling the congestion based on either channel load or information freshness only leads to sub-optimal performance. [less ▲]

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See detailTypes of health-related behaviours: a cluster analysis of the Luxembourgish HBSC data
Heinz, Andreas UL; Willems, Helmut Erich UL; van Duin, Claire UL et al

Scientific Conference (2021, June)

Background: Although it is known that health behaviours, socio-demographic variables and outcomes correlate, it is rarely investigated if there are typical patterns of these variables among the research ... [more ▼]

Background: Although it is known that health behaviours, socio-demographic variables and outcomes correlate, it is rarely investigated if there are typical patterns of these variables among the research subjects. Objectives: To find out whether the students can be divided into distinct groups based on their health behaviour and whether these groups differ in other ways (outcomes and socio-demographics). Method: In step 1, a hierarchical cluster analysis was carried out to determine the number of groups and to identify the cluster centres. In step 2, this information was entered as the initial values of a cluster centre analysis. In step 3, the clusters were characterised using additional variables. Results: The 8065 students surveyed could be divided into 5 distinct groups based on their data on smoking, drinking, soft drinks, exercising, fighting and bullying, with cluster 1 and cluster 5 representing the strongest contrast. Cluster 1 comprises students whose health behaviour is generally positive. It is the largest cluster with 49.5% of students. Cluster 5 comprises students whose behaviour is consistently negative. It is the smallest cluster with 7.1% of students. Students in cluster 2 are close to average on many variables, but their dental health is problematic because they frequently consume soft drinks and rarely brush their teeth. Students in cluster 3 are physically inactive, their mental health is poor, but they are also rarely injured. The students in cluster 4 stand out because of their aggressive behaviour. Conclusion: With the help of cluster analysis, it is possible to categorise the students into a small number of groups based on their health behaviour. These groups are coherent in terms of health behaviour, many outcome variables and socio-demographic variables. [less ▲]

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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 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 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 detailFirst results of the iterative STEAM design process in 3D modelling and printing with pre-service teachers
Kreis, Yves UL; Haas, Ben; Lavicza, Zsolt

Scientific Conference (2021, May 28)

While we examined mathematical modelling of architectures with CAD software during the last years, we intended in our higher education courses in pre-service elementary school teachers' initial training ... [more ▼]

While we examined mathematical modelling of architectures with CAD software during the last years, we intended in our higher education courses in pre-service elementary school teachers' initial training to expand the complexity of the modelling tasks. In addition, our previous research results indicated a high difference between the quality and functionality of designs by students. Therefore, we investigated the design process in 3D modelling and printing. Based on the industrial iterative design process (e.g., design of a pen), we became aware of the importance of iterative process milestones, quality controls, discussions and peer evaluations. Therefore, we created a remote teaching course for pre-service teachers to design complex objects (e.g., functionality) and create learning settings and tasks based on an iterative design process concept. We will present the first results and reflections at this conference. [less ▲]

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See detailScaling of urban heat island & NO2 with urban population: a meta-analysis
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2021, May 28)

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See detailMetadiscourse by native and non-native English speakers: importance marking in lectures
Deroey, Katrien UL; Johnson, Jane Helen

Scientific Conference (2021, May 27)

This talk has a dual purpose. In addition to mapping the use of one type of metadiscourse, viz. importance markers, across ‘native’ and ‘English Medium Instruction’ (EMI) lecture corpora, we elaborate on ... [more ▼]

This talk has a dual purpose. In addition to mapping the use of one type of metadiscourse, viz. importance markers, across ‘native’ and ‘English Medium Instruction’ (EMI) lecture corpora, we elaborate on analytical issues related to studying metadiscourse in spoken and disciplinary discourse. ‘Importance markers’ (Deroey & Taverniers, 2012) are lexicogrammatical metadiscursive devices combining discourse organization with evaluation along a ‘parameter of importance or relevance’ (Thompson and Hunston, 2000, p. 24). In lectures, they help students identify key content, which is useful for allocating processing resources while listening to what are typically dense monologues that require processing in real time. This in turns is likely to benefit understanding, note-taking and retention. Comparing the use of importance markers in a single-discipline corpus of engineering lectures by ‘native’ speakers and EMI lecturers, our aim was to contribute to the limited insights into the linguistic features of EMI lecture discourse generally and metadiscourse important for lecture discourse organization and hence lecture listening, specifically. Both researchers independently identified potential importance markers manually in lectures 46 engineering lectures (364,542 words) delivered in the Italy, Malaysia, the UK, and New Zealand,. Agreed instances were tagged and the tagged corpus imported into Sketch Engine to facilitate further analysis. Overall, native speakers and EMI lecturers differed little in importance marker frequency, range, types, and lexemes. In both corpora, the predominant verb marker was V n/clause (e.g. remember they don't know each other). The main difference was the far more common use of the listener-oriented 2 pers pron V n/clause marker (you must understand how to apply this one) by the non-native speakers but this was largely due to idiolectic variation. Contrary to most corpus linguistic metadiscourse studies, we report the inevitable analytical difficulties when identifying and classifying metadiscourse. Issues include establishing a definition that is broad enough to capture the various realizations of a metadiscursive function, while not ‘opening the floodgates’ to include instances that are not representative or that render the study unfeasible. For us this included distinguishing between evaluation of discourse and ‘real world’ entities, excluding very frequent phrases that could be viewed as importance markers but in this discipline probably served another function, and establishing a continuum of highlighting ‘force’. These considerations necessitated careful manual analysis of a relatively small corpus, which however means that generalization are limited and idiolectic bias more likely. [less ▲]

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See detailScience Inequalities
Kozlowski, Diego UL

Poster (2021, May 21)

Detailed reference viewed: 75 (58 UL)
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See detailA data-driven computational framework to provide deformable solids with the sense of touch
Hurtado Cathalifaud, Diego Rene UL

Poster (2021, May 21)

A data-driven, probabilistic, computational framework will be developed that provides a deformable solid with the sense of 'touch', so that it can detect the shape and mechanical behaviour of its ... [more ▼]

A data-driven, probabilistic, computational framework will be developed that provides a deformable solid with the sense of 'touch', so that it can detect the shape and mechanical behaviour of its environment. The framework will rely on three modules: a mechanical model to simulate the contact between the deformable solid and its environment, a machine learning module to rapidly emulate the mechanical simulations, and a probabilistic framework to identify the shape and mechanical behaviour of the solid’s environment. [less ▲]

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See detailIndividually Tailored Neurofeedback
Uslu, Sinan UL

Poster (2021, May 21)

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See detailGNSS-R GRAZING ANGLE FOR SEA ICE ALTIMETRY
Navarro Buendìa, Raquel UL

Poster (2021, May 21)

The grazing angle signals of opportunities from Global Navigation Satellite System (GNSS) are used to perform precise sea-ice altimetry. The novel GNSS-Reflectometry (GNSS-R) would help to better ... [more ▼]

The grazing angle signals of opportunities from Global Navigation Satellite System (GNSS) are used to perform precise sea-ice altimetry. The novel GNSS-Reflectometry (GNSS-R) would help to better understand the sea-ice distribution and classification in the polar regions. [less ▲]

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See detailLinking Executive Functions and Math Intelligence in Preschool Children: A Meta-Analysis
Emslander, Valentin UL; Scherer, Ronny

Scientific Conference (2021, May 20)

Background: Executive functions (i.e., response inhibition, attention shifting, working memory updating) have shown to be related to the mathematical component of intelligence, which, in turn, is ... [more ▼]

Background: Executive functions (i.e., response inhibition, attention shifting, working memory updating) have shown to be related to the mathematical component of intelligence, which, in turn, is predictive of various competences later in life. While this relation has already been thoroughly researched in school students and adults, a comprehensive research synthesis on preschool children—a group for which the assessment of these constructs is more challenging—is still missing. Evidence on the differentiation of cognitive skills over time suggests a differential relation of the three executive functions with math intelligence in older but not in younger children. It remains unclear, however, whether and which one of the three executive functions is more closely related to math intelligence in preschool children. Further research gaps concern the measurement of both executive functions and math intelligence in preschool children, as they cannot complete reading- and writing-based questionnaires. Addressing this measurement challenge, a plethora of inventive measurements has been used to assess both cognitive skills. These measurement differences might also have an influence on the relation between executive functions and math intelligence. Objectives: With our meta-analysis, we aimed to clarify the relation between executive functions and math intelligence in preschool children. Further, we wanted to investigate the influence of different measurement methods on this relation and look into the specific links of inhibition, shifting, and updating with math intelligence more closely. Research questions: 1. To what extent are inhibition, shifting, and updating (as a composite and separately) related to math intelligence in preschool children? (Overall correlations) 2. Which sample, study, and measurement characteristics moderate this relation? (Heterogeneity and moderators) 3. How much variation in math intelligence do inhibition, shifting, and updating explain jointly? (Model testing) Methods: We examined the relation between executive functions and math intelligence for 268 effect sizes from 29 studies for a total sample of 25,510 preschool children. Specifically, we synthesized the corresponding correlations by means of three-level random-effects meta-analyses (RQ 1) and examined the study, sample, and measurement characteristics as possible moderators of this relation between EFs and math intelligence via mixed-effects modeling (RQ 2). Further, we performed meta-analytic structural equation modeling to investigate the joint and differential effects inhibition, shifting, and updating on math intelligence (RQ 3). Results: We found executive functions and math intelligence to correlate moderately in preschool children (r = .35). Investigating inhibition, shifting, and updating separately also revealed moderate average correlations to math intelligence (r = .30, r = .38 , and r = .36, respectively). While we did not find age to explain significant amounts of heterogeneity, four measurement characteristics moderated the relation between executive function and math intelligence. When considered jointly through meta-analytic structural equation modeling, the relations of inhibition, shifting, and updating to math intelligence were similar. Conclusions and Implications: By presenting evidence for a significant relation between executive functions and math intelligence also in preschool children, our findings contribute to the discussion on the differentiation of cognitive skills. They highlight the importance of considering measurement characteristics when researching executive functions and math intelligence. Further, we could not confirm that inhibition, shifting, and updating are differentially related to math intelligence. Further research is needed to clarify the impact of age on the relation between executive functions and math intelligence. [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 detailDigital Cultural Heritage and the Politics of Digitisation
Zaagsma, Gerben UL

Scientific Conference (2021, May 11)

This talk deals with a question that is becoming increasingly important for historians who work with digitised cultural heritage: what are the politics of digitisation and what are its implications for ... [more ▼]

This talk deals with a question that is becoming increasingly important for historians who work with digitised cultural heritage: what are the politics of digitisation and what are its implications for historical research? Is the often-lauded democratising potential of digitisation also offset by challenges, inherent in selection processes that might privilege the digitisation of heritage corresponding to existing national master narratives, the availability of funding and/or the priorities set by cultural policies and certain research agendas? How does transnational heritage fit into this picture when most digitisation projects are, in one way or another, nationally framed? What biases can digital archives introduce in our work and how does that differ from issues of bias and selection in the ‘paper’ archive? A key point to highlight is that professional historians can and should be more open to learn from the experience of digital archivists and librarians who are at the forefront of the digital turn in heritage wsk. the talk will conclude with a brief plea and suggestion for transparancy guidelines for digital resources. [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 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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See detailHSM-based Key Management Solution for Ethereum Blockchain
Shbair, Wazen UL; Gavrilov, Eugene; State, Radu UL

in IEEE International Conference on Blockchain and Cryptocurrency, 3-6 May 2021 (2021, May 03)

The security of distributed applications backed by blockchain technology relies mainly on keeping the associated cryptographic keys (i.e. private keys) in well-protected storage. Since they are the unique ... [more ▼]

The security of distributed applications backed by blockchain technology relies mainly on keeping the associated cryptographic keys (i.e. private keys) in well-protected storage. Since they are the unique proof of ownership of the underlying digital assets. If the keys are stolen or lost, there is no way to recover the assets. The cold wallet is a good candidate for basic use cases, but it has a substantial challenge for more complex applications as it does not scale. Warm and hot wallets are more convenient options for blockchain-based solutions that aim to transact in a cloud environment. In this work, we focus on Hardware Security Module (HSM) based wallet. The HSM is the de-facto standard device designed to manage high-value cryptographic keys and to protect them against hacks. In this demonstration, we present an HSM-based working prototype that secures the entire life cycle of Ethereum public and private keys. [less ▲]

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See detailEvaluation of the Molecular Pathogenesis of Adrenocortical Tumors by Whole-Genome Sequencing
Neininger, Kerstin UL; May, Patrick UL; Altieri, Barbara et al

in Journal of the Endocrine Society (2021, May 03), 5(Issue Supplement_1), 68

Pathogenesis of autonomous steroid secretion and adrenocortical tumorigenesis remains partially obscure. Our aim was to identify novel genetic alterations in adrenocortical adenomas (ACA) without somatic ... [more ▼]

Pathogenesis of autonomous steroid secretion and adrenocortical tumorigenesis remains partially obscure. Our aim was to identify novel genetic alterations in adrenocortical adenomas (ACA) without somatic mutations in known driver genes. Whole-genome sequencing was performed on 26 ACA/blood-derived DNA pairs without driver mutations in PRKACA, GNAS and CTNNB1 genes at previous WES (ENSAT study JCEM 2016). These included 12 cortisol-producing adenomas with Cushing syndrome (CS-CPAs), 7 with mild autonomous cortisol secretion (MACS-CPAs), and 7 endocrine-inactive ACAs (EIAs). Seven adrenocortical carcinomas (ACC) were added to the cohort. We developed a bioinformatics pipeline for a comprehensive genome analysis and to reveal differences in variant distribution. Strelka, VarScan2 and ANNOVAR software and an in-house confidence score were used for variant calling and functional annotation. Combined Annotation-Dependent-Depletion (CADD) values were used to prioritize pathogenic variants. Additional focus relied on variants in pathogenically known pathways (Wnt/β-catenin, cAMP/PKA pathway). NovoBreak algorithm was applied to discover structural variations. Two hypermutated CS-CPA samples were excluded from further analysis. Using different filters, we detected variants in driver genes not observed at WES (one p.S45P in CTNNB1 and one p.R206L in PRKACA in two different CS-CPAs). In total, we report 179,830 variations (179,598 SNVs; 232 indels) throughout all samples, being more abundant in ACC (88,954) compared to ACA (CS-CPAs: 31,821; MACS-CPAs: 35,008; EIAs: 29,963). Most alterations were in intergenic (>50%), followed by intronic and ncRNA intronic regions. A total of 32 predicted pathogenic variants were found in both coding (CADD values ≥ 15) and non-coding (CADD values ≥ 5) regions. We found 3,301 possibly damaging and recurrent variants (intergenic mutations removed) (CS-CPAs: 1,463; MACS-CPAs: 1,549; EIAs: 1,268; ACC: 1,660), mostly accumulated in intronic regions. Some of these were detected in members of the Wnt/β-catenin (CS-CPAs: 6; MACS-CPAs: 2; EIA: 1) and cAMP/PKA (CS-CPAs: 6; MACS-CPAs: 7; EIA: 4) pathways (e.g. ADCY1, ADCY2, GNA13, PDE11A). We also found a slightly higher number of structural variations in EIA (3,620) and ACC (3,486) compared to CS-CPAs (977) and MACS-CPAs (2,119). In conclusion, still unrevealed genetic alterations, especially in intronic regions, may accompany early adrenal tumorigenesis and/or autonomous cortisol secretion. [less ▲]

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See detailA Replication Study on the Usability of Code Vocabulary in Predicting Flaky Tests
Haben, Guillaume UL; Habchi, Sarra UL; Papadakis, Mike UL et al

in 18th International Conference on Mining Software Repositories (2021, May)

Abstract—Industrial reports indicate that flaky tests are one of the primary concerns of software testing mainly due to the false signals they provide. To deal with this issue, researchers have developed ... [more ▼]

Abstract—Industrial reports indicate that flaky tests are one of the primary concerns of software testing mainly due to the false signals they provide. To deal with this issue, researchers have developed tools and techniques aiming at (automatically) identifying flaky tests with encouraging results. However, to reach industrial adoption and practice, these techniques need to be replicated and evaluated extensively on multiple datasets, occasions and settings. In view of this, we perform a replication study of a recently proposed method that predicts flaky tests based on their vocabulary. We thus replicate the original study on three different dimensions. First we replicate the approach on the same subjects as in the original study but using a different evaluation methodology, i.e., we adopt a time-sensitive selection of training and test sets to better reflect the envisioned use case. Second, we consolidate the findings of the initial study by building a new dataset of 837 flaky tests from 9 projects in a different programming language, i.e., Python while the original study was in Java, which comforts the generalisability of the results. Third, we propose an extension to the original approach by experimenting with different features extracted from the Code Under Test. Our results demonstrate that a more robust validation has a consistent negative impact on the reported results of the original study, but, fortunately, these do not invalidate the key conclusions of the study. We also find re-assuring results that the vocabulary-based models can also be used to predict test flakiness in Python and that the information lying in the Code Under Test has a limited impact in the performance of the vocabulary-based models [less ▲]

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See detailRAICC: Revealing Atypical Inter-Component Communication in Android Apps
Samhi, Jordan UL; Bartel, Alexandre UL; Bissyande, Tegawendé François D Assise UL et al

in Samhi, Jordan; Bartel, Alexandre; Bissyande, Tegawendé François D Assise (Eds.) et al 43rd International Conference on Software Engineering (ICSE) (2021, May)

Inter-Component Communication (ICC) is a key mechanism in Android. It enables developers to compose rich functionalities and explore reuse within and across apps. Unfortunately, as reported by a large ... [more ▼]

Inter-Component Communication (ICC) is a key mechanism in Android. It enables developers to compose rich functionalities and explore reuse within and across apps. Unfortunately, as reported by a large body of literature, ICC is rather "complex and largely unconstrained", leaving room to a lack of precision in apps modeling. To address the challenge of tracking ICCs within apps, state of the art static approaches such as Epicc, IccTA and Amandroid have focused on the documented framework ICC methods (e.g., startActivity) to build their approaches. In this work we show that ICC models inferred in these state of the art tools may actually be incomplete: the framework provides other atypical ways of performing ICCs. To address this limitation in the state of the art, we propose RAICC a static approach for modeling new ICC links and thus boosting previous analysis tasks such as ICC vulnerability detection, privacy leaks detection, malware detection, etc. We have evaluated RAICC on 20 benchmark apps, demonstrating that it improves the precision and recall of uncovered leaks in state of the art tools. We have also performed a large empirical investigation showing that Atypical ICC methods are largely used in Android apps, although not necessarily for data transfer. We also show that RAICC increases the number of ICC links found by 61.6% on a dataset of real-world malicious apps, and that RAICC enables the detection of new ICC vulnerabilities. [less ▲]

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See detailThEodorE: a Trace Checker for CPS Properties
Menghi, Claudio UL; Vigano, Enrico UL; Bianculli, Domenico UL et al

in Companion Proceedings of the 43rd International Conference on Software Engineering (2021, May)

ThEodorE is a trace checker for Cyber-Physical systems (CPS). It provides users with (i) a GUI editor for writing CPS requirements; (ii) an automatic procedure to check whether the requirements hold on ... [more ▼]

ThEodorE is a trace checker for Cyber-Physical systems (CPS). It provides users with (i) a GUI editor for writing CPS requirements; (ii) an automatic procedure to check whether the requirements hold on execution traces of a CPS. ThEodorE enables writing requirements using the Hybrid Logic of Signals (HLS), a novel, logic-based specification language to express CPS requirements. The trace checking procedure of ThEodorE reduces the problem of checking if a requirement holds on an execution trace to a satisfiability problem, which can be solved using off-the-shelf Satisfiability Modulo Theories (SMT) solvers. This artifact paper presents the tool support provided by ThEodorE. [less ▲]

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See detailThe Hormones of Dark Souls: The Dark Tetrad and Violent Gaming Effects on Aggression, Cortisol and Testosterone Levels
Wagener, Gary; Felten, Andrea; Melzer, André UL

Scientific Conference (2021, May)

Although playing violent video games may lead to detrimental effects on cognition, emotion and behavior, the role of hormones and its interplay with personality characteristics is not well understood. An ... [more ▼]

Although playing violent video games may lead to detrimental effects on cognition, emotion and behavior, the role of hormones and its interplay with personality characteristics is not well understood. An experimental study tested how playing a violent versus non-violent video game affects cortisol and testosterone levels, whether these hormonal changes increase implicit aggressive cognition, and whether Dark Tetrad personality traits moderate these effects. In an experimental design, 54 male participants played either a violent or a non-violent video game. Participants provided salivary samples at the beginning of the experiment (T1), right after 25 minutes of gameplay (T2), and 20 minutes after that (T3). There were no significant effects on implicit aggressive cognition. However, participants in the violent game condition had a significant decrease in cortisol levels (T1 to T2) and a significant negative trend in cortisol levels from T1 to T3. Participants with higher Machiavellianism scores in the violent condition had a stronger decrease in cortisol (T1 to T2). In contrast, participants with higher Machiavellianism scores in the non-violent condition had a higher increase in cortisol (T1 to T2). The present findings illustrate the complex interplay between personality, hormones, and game content, thus specifying current notions on violent game effects. [less ▲]

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See detailOffice Agents: Personal Office Vitality Sensors with Intent
Stamhuis, Sjoerd; Brombacher, Hans; Vos, Steven et al

Scientific Conference (2021, May)

In smart office buildings, almost every aspect of the environment can be assessed and adjusted by sensors. Yet employees rarely have access to the data collected to act upon it. It is also unclear what ... [more ▼]

In smart office buildings, almost every aspect of the environment can be assessed and adjusted by sensors. Yet employees rarely have access to the data collected to act upon it. It is also unclear what they would find meaningful to follow the recommendations on healthy work conditions and behavior, while productivity is the priority. The Office Agents are a set of artefacts placed on the employee’s desk, which capture data about the office environment. Air quality, sound level, light exposure, productivity, and physical activity level are measured to provide office workers with feedback on the ‘best’ working conditions. Using speculative design and Objects with Intent, the employee engages in a negotiation with the Office Agents based on the office ecosystem. Through this project and interactivity session, we open a debate on the use of sensors in office environments and the stakes around office vitality from the viewpoint of the employees. [less ▲]

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See detailUsing Domain-specific Corpora for Improved Handling of Ambiguity in Requirements
Ezzini, Saad UL; Abualhaija, Sallam UL; Arora, Chetan et al

in In Proceedings of the 43rd International Conference on Software Engineering (ICSE'21), Madrid 25-28 May 2021 (2021, May)

Ambiguity in natural-language requirements is a pervasive issue that has been studied by the requirements engineering community for more than two decades. A fully manual approach for addressing ambiguity ... [more ▼]

Ambiguity in natural-language requirements is a pervasive issue that has been studied by the requirements engineering community for more than two decades. A fully manual approach for addressing ambiguity in requirements is tedious and time-consuming, and may further overlook unacknowledged ambiguity – the situation where different stakeholders perceive a requirement as unambiguous but, in reality, interpret the requirement differently. In this paper, we propose an automated approach that uses natural language processing for handling ambiguity in requirements. Our approach is based on the automatic generation of a domain-specific corpus from Wikipedia. Integrating domain knowledge, as we show in our evaluation, leads to a significant positive improvement in the accuracy of ambiguity detection and interpretation. We scope our work to coordination ambiguity (CA) and prepositional-phrase attachment ambiguity (PAA) because of the prevalence of these types of ambiguity in natural-language requirements [1]. We evaluate our approach on 20 industrial requirements documents. These documents collectively contain more than 5000 requirements from seven distinct application domains. Over this dataset, our approach detects CA and PAA with an average precision of 80% and an average recall of 89% ( 90% for cases of unacknowledged ambiguity). The automatic interpretations that our approach yields have an average accuracy of 85%. Compared to baselines that use generic corpora, our approach, which uses domain-specific corpora, has 33% better accuracy in ambiguity detection and 16% better accuracy in interpretation. [less ▲]

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See detailAge of Information in IEEE 802.11p
Baiocchi, Andrea; Turcanu, Ion UL; Lyamin, Nikita et al

in 17th IFIP/IEEE International Symposium on Integrated Network Management (IM): ITAVT Workshop (2021, May)

Vehicle-to-Everything (V2X) communication is essential for facilitating connected and automated driving, where vehicles and other road traffic participants share data instantaneously and cooperate to ... [more ▼]

Vehicle-to-Everything (V2X) communication is essential for facilitating connected and automated driving, where vehicles and other road traffic participants share data instantaneously and cooperate to solve tricky traffic situations in milliseconds. This paper proposes two stochastic models for the V2X standard IEEE 802.11p to characterize amongst other things the Age of Information (AoI), a recently-proposed metric that measures the freshness of information. The first model is based on renewal process analysis of a tagged station with mean field approximation, while the second one adopts Markov chain approach with network level view. Analytical results show that IEEE 802.11p, given its adaptability to event-triggered and aperiodic messaging, supports advanced cooperative driving scenarios. [less ▲]

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See detailThe impact of COVID-19 in the migration area in EU and OECD countries
Sommarribas, Adolfo UL; Sheridan, Anne

Scientific Conference (2021, April 30)

The European Migration Network (EMN) and the Organisation for Economic Co-operation and Development (OECD) have published updated information on the impact of COVID-19 in the migration area. The new ... [more ▼]

The European Migration Network (EMN) and the Organisation for Economic Co-operation and Development (OECD) have published updated information on the impact of COVID-19 in the migration area. The new Umbrella Inform completes the joint EMN and OECD Inform series between on the impact of COVID-19 on migration and asylum in the EU Member States and non-EU OECD countries throughout 2020. Updates include changes in border procedures, provision of COVID-19 related healthcare services to migrants, the shifting landscape of the labour market, international protection, international students, and return issues. [less ▲]

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See detailSoziale Kohäsion und Exklusion im luxemburgischen Wohnungswesen
Dujardin, Céline UL

Scientific Conference (2021, April 23)

Kontext und Problematik Im Großherzogtum Luxemburg ist die Nachfrage an bezahlbarem Wohnraum deutlich höher als das bestehende Angebot (Manet, 2017; Reuter, 2017). Für die finanziell benachteiligten ... [more ▼]

Kontext und Problematik Im Großherzogtum Luxemburg ist die Nachfrage an bezahlbarem Wohnraum deutlich höher als das bestehende Angebot (Manet, 2017; Reuter, 2017). Für die finanziell benachteiligten Haushalte stellen die Wohnkosten von ungefähr 40% des verfügbaren Budgets eine wesentliche und sehr hohe Ausgabe dar. Generell kann sogar eine Verschärfung des Armutsrisikos durch die Wohnkosten beobachtet werden (Ametepe, 2019). Die luxemburgische Bevölkerung setzt sich aus den folgenden Nationalitäten zusammen: 52,5% Luxemburger, wobei etwas mehr als eine Person von 10 eine doppelte Staatsangehörigkeit besitzt und 40,1% Nationalitäten aus den weiteren 27 EU-Mitgliedsstaaten, wobei 15,6% Portugiesen den größten Anteil darstellen (Klein & Peltier, 2019). Antworten und Herausforderungen der Sozialen Arbeit Der wahrscheinlich größte Anteil der Obdachlosenhilfe besteht europaweit aus niederschwelligen Dienstleistungen, die grundlegende Unterstützung außerhalb des Wohnungswesens bieten oder aus der Bereitstellung von Notfallunterkunft/vorübergehender Unterbringung. Im Gegensatz dazu sind Dienste, die obdachlosen Menschen sofort ein dauerhaftes Zuhause bieten, in den meisten Ländern nur bis zu einem gewissen Grad präsent (Pleace, Baptista, Benjaminsen & Busch-Geertsema, 2018). In Anlehnung an die bestehenden Vergleichsstudien des European Observatory on Homelessness sowie an die europäische Typologie für Wohnungslosigkeit ETHOS wird auch das entsprechende Handlungsfeld der Sozialen Arbeit in Luxemburg durchleuchtet. Anhand dieser Darstellung folgt eine Diskussion über die bestehenden Herausforderungen für Wissenschaft, Politik und Praxis. Diskussion und Ausblick Soziale Kohäsion wird gerne als Zielsetzung und Antwort auf die Problematiken des luxemburgischen Wohnungswesens aufgeführt. Nach Habermeier (2005) umfasst die soziale Kohäsion den Ist-Zustand des Zusammenhalts einer Gemeinschaft – von der Paarbeziehung bis zur Gesamtgesellschaft – und nicht seine Entstehung. Die soziale Kohäsion als Ziel hingegen ist ein Soll-Zustand, der mehrere Fragen aufwirft, z.B. ob soziale Kohäsion planbar ist oder sich verstärken lässt, ob sie immer ein theoretischer Idealtyp der Gesellschaft bleibt oder ob die Soziale Arbeit soziale Kohäsion unterstützen kann ohne ihre Klienten in ein Abhängigkeitsverhältnis zu setzen. Bibliographie Ametepe, F. (2019). Le logement, amplificateur des inégalités au Luxembourg. Regards, 18(8). Disponible sous : https://statistiques.public.lu/catalogue-publications/regards/2019/PDF-18-2019.pdf Habermeier, R. (2005). Soziale Kohäsion. Hitotsubashi Journal of Social Studies, 37(1), 1-17. Klein, C. & Peltier, F. (2019). 93% de la population luxembourgeoise sont des ressortissants de l’UE-28. Regards, 7(5). Disponible sous : https://statistiques.public.lu/catalogue-publications/regards/2019/PDF-07-2019.pdf Manet, B. (2017). Schlimmer als die Bewerbung für einen Job? Die Facebook-WG-colocation-à louer-Welt Luxemburgs. Forum für Politik, Gesellschaft und Kultur, 372, 31. Pleace, N., Baptista, I., Benjaminsen, L. & Busch-Geertsema, V. (2018). Homelessness Services in Europe. EOH Comparative Studies on Homelessness. Brussels: European Observatory on Homelessness. Reuter, J.-P. (2017). Wohnst du schon oder suchst du noch? Über Schwierigkeiten adäquat wohnen zu dürfen und den Versuch Lösungen zu finden. Forum für Politik, Gesellschaft und Kultur, 372, 24-26. [less ▲]

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See detailResults of the project TRANSLA
Aleksic, Gabrijela UL; Bebić-Crestany, Džoen Dominique UL

Scientific Conference (2021, April 21)

In this Conference, we presented the the results from the project TRANSLA, with the focus on the teachers. According to the results from the questionnaires that were administered before and after the ... [more ▼]

In this Conference, we presented the the results from the project TRANSLA, with the focus on the teachers. According to the results from the questionnaires that were administered before and after the professional development course in translanguaging pedagogy, there was a significant increase in teachers' positive attitudes towards multilingualism and the use of children's home languages, and a significant decrease of focus on Luxembourgish only, after the course. The focus groups before and after the course and the interviews after the course showed that there was a raise of awareness of the link between implementation of home languages and children's well-being, positive change in deficit perspective of children, and positive change in attitudes (however, for some still firm monolingual stance). Finally, the teachers shared that there was a positive change in their practice (however, for some too time-consuming). [less ▲]

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See detailStudying transnational events through web archives
Schafer, Valerie UL

Scientific Conference (2021, April 20)

This short presentation was a mid-term feedback on the collective work of WG2 that I lead within the WARCnet project. I especially underlined the research we conducted through an internal datathon we ... [more ▼]

This short presentation was a mid-term feedback on the collective work of WG2 that I lead within the WARCnet project. I especially underlined the research we conducted through an internal datathon we organised in January 2021 and which used seed lists, derived data and metadata. [less ▲]

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See detailThird-country National Labour Workers' Mobility to and inside Europe during the COVID-19 Pandemic
Nienaber, Birte UL; Sommarribas, Adolfo UL

Scientific Conference (2021, April 15)

This presentation analyses the situation generated by the Covid-19 pandemic crisis regarding border closures and the reintroduction of temporary border controls at the internal borders in the EU and the ... [more ▼]

This presentation analyses the situation generated by the Covid-19 pandemic crisis regarding border closures and the reintroduction of temporary border controls at the internal borders in the EU and the impact that this border closures and the pandemic had on third-country nationals living or visiting the European Union. [less ▲]

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See detailMapping citizens’ reflections and perceptions of place-based experiences in the time of COVID-19
Jones, Catherine UL

Scientific Conference (2021, April 14)

Using a Citizen Science Approach, the ZesummenMaps project explores the emergent spatial interactions of our towns, cities and rural areas that arise from the COVID-19 pandemic and social distancing and ... [more ▼]

Using a Citizen Science Approach, the ZesummenMaps project explores the emergent spatial interactions of our towns, cities and rural areas that arise from the COVID-19 pandemic and social distancing and confinement policies in Luxembourg and the Greater Region. Citizens (residents, students, cross-border workers) reflect on their personal experiences of place during the crises. They contribute thoughts and perceptions through a collaborative community-mapping interface. This provides a foundation to explore, evaluate and understand the evolving perceptions and uses of public spaces, infrastructures and physical environments. Thus, creating an evidence-base of emerging spatial interactions to inform understanding of the impact of the "bleift doheem" policy (stay at home, confinement, lockdown) related to our perceptions and uses of our towns, cities and rural areas. [less ▲]

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See detailEco-construction for sustainable development: Concept of a Material and Component Bank
JAYASINGHE, Laddu Bhagya; Waldmann, Daniele UL

in POWERSKIN Conference Proceedings (2021, April 09)

The European Commission has recently promulgated the concept of Circular Economy as a new pathway towards sustainability, in particular through new policy initiatives such as the Circular Economy Action ... [more ▼]

The European Commission has recently promulgated the concept of Circular Economy as a new pathway towards sustainability, in particular through new policy initiatives such as the Circular Economy Action Plan (CEAP). Since the environmental impact of the construction industry with the depletion of natural resources and the raising CO2 emissions will have to be reduced in the future, the need of recycling and even reusing entire building components supporting the principles of circular economy have been identified. The direct reuse of components extracted from old deconstructed buildings presents an energy-efficient and environmental-friendly solution. However, the reuse of components can be hindered by e.g. the lack of information on the availability of decommissioned structural components and uncertainties on the warranty of structural components. To handle this process an additional independent institution acting as Material and Component (M&C) Bank is needed. This entity assures activities such as e.g. the identification of reusable components in buildings which are proposed for selective dismantling; the condition assessment; the data management and the data transfer from a previously deconstructed building to a new building; and finally, an official certification of the components’ conformity for another service life in a new application. In the current paper, a concept for such a M&C bank is presented. This study investigates the potential of a M&C bank in the framework of circular economy concepts for the planning of sustainable and circular buildings with a reduced eco-footprint by focusing on the reuse of decommissioned structural components. The concept, main businesses and work operation of the bank are discussed. Furthermore, a digital representation of the bank as BIM-based M&C bank needed to publicize the availability of the reusable components to the market and to enable circular business models by showing their circular pathways are described. [less ▲]

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See detailDesign model for dry-stacked and demountable masonry blocks
Chewe Ngapeya, Gelen Gael; Waldmann, Daniele UL

in POWERSKIN Conference Proceedings (2021, April 09)

The construction industry around the world produces a large part of inert wastes mainly coming from building demolitions. Facing to this envi-ronmental challenge and considering the new policy initiatives ... [more ▼]

The construction industry around the world produces a large part of inert wastes mainly coming from building demolitions. Facing to this envi-ronmental challenge and considering the new policy initiatives supporting the designing of sustainable buildings, dry-stacked masonry comes forward as a promising solution since components can be dismantled, saved in a component bank and reassembled on new sites. The speedy growth of the construction industry, the increasing importance given to the complete life cycle of buildings and the evolution of construction technics have led to the development of dry-stacked masonry structures. Mortarless masonry structures minimise skilled labour requirements and improve construction productivity. However, despite these advantages, there are no design standards providing guidelines to assess the load-bearing capacity of dry-stacked masonry block, which therefore limits its use in construction. In an attempt to fill this lack, the current paper investigates the load-bearing capacity of dry-stacked masonry and its influencing parameters. The effects of the geometric imperfections such as height imperfections and bed-joint roughness have been analysed as well as a mitigation strategy. Then, based on experimental evidence, a design method has been proposed for dry-stacked masonry solicited by axial compression. The developed design methodology provided promising results, with 93% of accuracy in the prediction of the dry-stacked masonry’s’ load-bearing capacity. [less ▲]

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See detailSocial Inequality in Education: Academic Achievement of First-, Second-, and Later-Generation Immigrant Students in Luxembourg
Rivas, Salvador UL; Reichel, Yanica UL; Krämer, Charlotte UL et al

Scientific Conference (2021, April 08)

Students with immigrant backgrounds are often disadvantaged in public educational systems. In Luxembourg, about 50% of primary and secondary school students have an immigrant background, most notably from ... [more ▼]

Students with immigrant backgrounds are often disadvantaged in public educational systems. In Luxembourg, about 50% of primary and secondary school students have an immigrant background, most notably from Italy, the former Yugoslavia and Portugal. Using data from Luxembourg’s national school monitoring program, we investigate and document for the first time, existing and emerging differences in academic achievement among different immigrant generations of students. Our results indicate that student achievement in Math, German and French is differentially affected by immigrant generational status and language spoken at home. In addition, we find secondary effects of student social background. [less ▲]

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See detailDesigning EMI lecturer training programmes: what and how
Deroey, Katrien UL

Scientific Conference (2021, April 08)

This workshop will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training. Although universities have been slow to organize EMI lecturer support, an increasing ... [more ▼]

This workshop will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training. Although universities have been slow to organize EMI lecturer support, an increasing awareness of the challenges faced by EMI lecturers and their students now appears to be boosting the demand for EMI lecturer training and support initiatives. Consequently, EAP practitioners can increasingly expect requests to design and deliver such programmes. However, the efficient design and delivery of EMI lecturing training and support is a complex challenge. First, the EMI context is very varied and initiatives should be adapted to the local cultural, educational, linguistic and institutional contexts (Herington, 2020; Martinez & Fernandes, 2020; Tuomainen, 2018). Second, most literature highlights the need for language, pedagogical and intercultural components (e.g. Fortanet Gómez, 2020). Third, we need to be sensitive to lecturers’ attitudes towards EMI and EMI training (Tsui, 2018). Fourth, there are practical considerations such as the timely provision of support (Guarda & Helm, 2017), promoting participation, facilitating learning transfer to lectures, and optimizing the support in view of what are often heterogeneous participant groups in terms of English proficiency, (EMI) lecturing experience and discipline (Ball & Lindsay, 2013). Finally, the design of these programmes typically needs to happen with very limited institutional resources, few (if any) published materials and relatively little published research on lecture discourse and EMI lecturer training. The workshop will start with an overview of published training initiatives with their reported successes and challenges (Deroey, 2021). Next, participants will work in small groups, brainstorming ideas for an EMI support programme based on a brief we have recently received at the multilingual University of Luxembourg Language Centre. Finally, these proposals will be discussed in the whole group and key ideas summarized to consolidate the insights gained. Ball, P., & Lindsay, D. (2013). Language demands and support for English-medium instruction in tertiary education. Learning from a specific context In A. Doiz, D. Lasagabaster, & J. M. Sierra (Eds.), English-medium instruction at universities: Global challenges (pp. 44-61). Bristol: Multilingual Matters. -Deroey, K. L. B. (2021). Lecturer training for English Medium Instruction: what and how? In B. D. Bond, A. & M. Evans (Ed.), Innovation, exploration and transformation. Proceedings of the 2019 BALEAP Conference. Reading: Garnet. -Fortanet Gómez, I. (2020). The dimensions of EMI in the international classroom: training teachers for the future university. In M. Del Mar Sánchez-Pérez (Ed.), Teacher training for English-medium instruction in higher education (pp. 1-20). Hershey: IGI Global. -Guarda, M., & Helm, F. (2017). A survey of lecturers’ needs and feedback on EMI training. In K. Ackerley, M. Guarda, & F. Helm (Eds.), Sharing perspectives on English-medium instruction (pp. 167-194). Bern: Peter Lang. -Herington, R. (2020). Observation as a tool to facilitate the professional development of teaching faculty involved in English as a Medium of Instruction: trainer and trainee perspectives. In M. L. Carrió-Pasto (Ed.), Internationalising Learning in Higher Education (pp. 65-82). Hershey: IGI Global. -Martinez, R., & Fernandes, K. (2020). Development of a teacher training course for English medium instruction for higher education professors in Brazil. In M. Del Mar Sánchez-Pérez (Ed.), Teacher Training for English-Medium Instruction in Higher Education (pp. 125-152). Hershey: IGI Global. -Tuomainen, S. (2018). Supporting non-native university lecturers with English-medium instruction. Journal of Applied Research in Higher Education. 10(3), 230-242. -Tsui, C. (2018). Teacher efficacy: a case study of faculty beliefs in an English-medium instruction teacher training program. Taiwan Journal of TESOL, 15(1), 101-128. [less ▲]

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See detailDesigning and managing an online, personalised research writing course for postgraduates
Deroey, Katrien UL; Skipp, Jennifer

Scientific Conference (2021, April 08)

This paper describes and evaluates an online research article writing course at the University of Luxembourg. Participants were self-referred PhD students from different disciplines. The aim of the ten ... [more ▼]

This paper describes and evaluates an online research article writing course at the University of Luxembourg. Participants were self-referred PhD students from different disciplines. The aim of the ten-week course is to improve insight into the structural, stylistic and rhetorical features of research articles as well as the writing and publication process. It also provides tools for students to develop their own writing. We will situate our course rationale and design within the literature, then compare these to both the reality of managing and delivering the course online as well as participants’ feedback as reflected in 30 surveys. We will focus on the following results: • The practicability of including multiple pedagogical elements in an online course was challenging. We wanted to integrate both independent and collaborative work, production and reflection. However, results of the surveys and our own experience show that the multiplicity of elements was often seen as complex and difficult to manage and multiple submission deadlines problematic. • Students favoured working alone over working together and uptake of writing groups (Aitchison, 2009) was poor. Multi-disciplinary peer groups were, however, positively reviewed (cf. Hyland, 2012). • The flexibility of the online environment was seen as positive, yet many reported problems finding time to write. However, participants did see the benefit in having to write regularly. Tools of reflection did not score highly. • The personalisation of learning input scored highly in the survey, but this was time-consuming to implement. Whilst instructor-student consultations were offered to further personalise feedback, these had a low uptake (8/30). • We wanted to create a course which included guidance on the writing and publication process (Starfield & Paltridge, 2016) as well as increased genre awareness (Swales, 1990) to prepare students for publication. However, tasks on language and structure were rated more useful by more students than this content. • More participants commented on the benefit of working through their language issues in live sessions over learning how to address language issues through the corpus-tools that were integrated into the course (Charles, 2018). Through sharing this information, we hope to generate a discussion with the audience about ways to optimise online writing courses and manage some of the problems associated with online delivery. Aitchison, C. (2009). Writing groups for doctoral education. Studies in Higher Education, 34(8), 905-916. Charles, M. (2018) Corpus-assisted editing for doctoral students: More than just concordancing. Journal of English for Academic Purposes, 36, 15-26. Charles, M. (2018). Using do-it-yourself-corpora in EAP: A tailor-made resource for teachers and students. Teaching English for Specific and Academic Purposes, 6(2), 217-224. Hyland, K. (2012). Disciplinary Identities: Individuality and Community in Academic Discourse. Cambridge: Cambridge University Press. Nesi, H. & Gardener, S. (2012). Genres across the disciplines: Student writing in higher education. Cambridge: Cambridge University Press. Paltridge, B., & Starfield, S. (2016). Getting published in academic journals: Navigating the publication process. Ann Arbor: University of Michigan Press. Swales, J. (1990). Genre analysis: English in academic and research settings. Cambridge: Cambridge University Press. [less ▲]

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See detailTransition from traditional to hybrid to online courses for pre-service elementary school teachers at the University of Luxembourg: STEAM integrated approach in the project MathEduc @ BScE
Kreis, Yves UL; Haas, Ben

Scientific Conference (2021, April 07)

During the past year, technology has started enabling new forms of teaching and learning in higher education in Luxemburg. Thus, to be able to work more closely with elementary school pre-service teachers ... [more ▼]

During the past year, technology has started enabling new forms of teaching and learning in higher education in Luxemburg. Thus, to be able to work more closely with elementary school pre-service teachers, we shifted our mathematics education course during the past years to flipped classroom approaches and worked with synchronous and asynchronous teaching on- and off-campus modes. Furthermore, due to the restrictions of the COVID-19 pandemic, we decided to shift our teaching to entirely online flipped classroom approaches together with outdoor mathematical trails with STEAM integrated assessments. This final shift to a fully online flipped classroom, with self-paced, student-centred teachings and learnings, showed strong positive effects on pre-service elementary school teachers in mathematics teaching. In this presentation, we will outline results of this transition period and describe results from different studies. [less ▲]

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