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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 detailService Performance Pattern Analysis and Prediction of Commercially Available Cloud Providers
Wagle, Shyam Sharan UL; Guzek, Mateusz UL; Bouvry, Pascal UL

in Service Performance Pattern Analysis and Prediction of Commercially Available Cloud Providers (in press)

The knowledge of service performance of cloud providers is essential for cloud service users to choose the cloud services that meet their requirements. Instantaneous performance readings are accessible ... [more ▼]

The knowledge of service performance of cloud providers is essential for cloud service users to choose the cloud services that meet their requirements. Instantaneous performance readings are accessible, but prolonged observations provide more reliable information. However, due to technical complexities and costs of monitoring services, it may not be possible to access the service performance of cloud provider for longer time durations. The extended observation periods are also a necessity for prediction of future behavior of services. These predictions have very high value for decision making both for private and corporate cloud users, as the uncertainty about the future performance of purchased cloud services is an important risk factor. Predictions can be used by specialized entities, such as cloud service brokers (CSBs) to optimally recommend cloud services to the cloud users. In this paper, we address the challenge of prediction. To achieve this, the current service performance patterns of cloud providers are analyzed and future performance of cloud providers are predicted using to the observed service performance data. It is done using two automatic predicting approaches: ARIMA and ETS. Error measures of entire service performance prediction of cloud providers are evaluated against the actual performance of the cloud providers computed over a period of one month. Results obtained in the performance prediction show that the methodology is applicable for both short- term and long-term performance prediction. [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 detailNeue Staaten – neue Grenzen. Die Rhein-Maas-Mosel-Region zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress (1779 – 1816)
Uhrmacher, Martin UL

in Fickers, Andreas; Franz, Norbert; Laux, Stephan (Eds.) et al Repression, Reform und Neuordnung im Zeitalter der Revolutionen: Die Folgen des Wiener Kongresses für Westeuropa. Tagung und Workshop zum 200. Jahrestag des Abschlusses des Wiener Kongresses (in press)

Abstract Konferenz 200 Jahre Wiener Kongress Martin Uhrmacher Neue Staaten – neue Grenzen. Die Großregion zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress ... [more ▼]

Abstract Konferenz 200 Jahre Wiener Kongress Martin Uhrmacher Neue Staaten – neue Grenzen. Die Großregion zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress (1779 – 1816). Der Vortrag untersucht die Veränderung von Grenzen und Ihre Entwicklung von sich teils überlagernden und durch Enklaven und Gemeinsherrschaften durchsetzten historisch gewachsenen Grenzsäumen hin zu begradigten, fest definierten und teils naturräumlichen Scheidelinien folgenden Staatsgrenzen. In der heutigen Großregion vollzog sich dieser fundamentale Wandel in nur drei Jahrzehnten: Er gliederte die Region vollkommen neu. Zunächst waren es 1779 mit dem Brüsseler Vertrag nach jahrzehntelangen Verhandlungen endlich zu einem Ausgleich zwischen Österreich und Frankreich gekommen, der die Grenzstreitigkeiten beseitigte und neue, begradigte Grenzen exakt festlegte. Ein ähnlicher Vertrag wurde auch zwischen Österreich und Kurtrier abgeschlossen. Doch die als endgültig geplanten Regelungen bestanden nur wenige Jahre: Infolge der französischen Revolution annektierte die französische Republik am 1. Oktober 1795 die österreichischen Niederlande mit dem Herzogtum Luxemburg und kurz darauf auch Kurtrier und die anderen linksrheinischen Territorien. Alle Staaten wurden aufgelöst und gehörten nun zum französischen Staatsgebiet; Teile der alten Grenzen bestanden als Départementsgrenzen weiter. Nach der Absetzung Napoleons beschloss der Wiener Kongress 1815 eine Neuordnung Europas. Doch im Maas-Moselraum blieben mit Ausnahme Frankreichs alle Territorien und Landesherrschaften, die hier seit dem Früh- und Hochmittelalter bestanden hatten verschwunden. Sie wurden ersetzt durch das neu gegründete Großherzogtum Luxemburg und das ebenfalls neu gegründete Königreich der Vereinigten Niederlande sowie durch die preußische Rheinprovinz, die den gesamten östlichen Teil umfasste. Bei der territorialen Neugliederung griff man in Teilen auf die bis 1795 bestehenden Grenzen des alten Herzogtums zurück. In der Schlussakte des Wiener Kongresses behandeln die Artikel 66 bis 69 das Großherzogtum Luxemburg. Hier werden die Grenzen des neuen Staates allerdings nur grob umrissen; detaillierte Regelungen blieben späteren Verträgen vorbehalten. Unstrittig war die Süd- und Westgrenze mit Frankreich; sie entsprach der 1769/79 festgesetzten und bis 1795 gültigen Linie mit Ausnahme des ehemaligen Herzogtums Bouillon als Zugewinn. Vollkommen neu festgelegt wurde jedoch die Ostgrenze: Mit der Schlussakte des Wiener Kongresses waren alle hier an Luxemburg angrenzenden Gebiete an das Königreich Preußen gefallen. In den Verträgen von Aachen (26. Juni 1816) und Kleve (7. Oktober 1816) einigten sich die niederländische und die preußische Seite darauf, dass die Flussläufe von Mosel, Sauer und Our zukünftig die gemeinsame Grenze bildeten. Hier offenbart sich ein grundlegender Wandel im Verständnis und der Genese von Grenzen: Bisher waren territoriale Veränderungen auf Grundlage historisch gewachsener Herrschaftsstrukturen vorgenommen worden. So konnten kleinere Herrschaften aber auch größere Gebietskonglomerate zwar durch Tausch, Verkauf, Abtretung oder - wie durch Frankreich praktiziert - als „Reunionen“ die territoriale Zugehörigkeit wechseln. Dabei wurden jedoch die historisch gewachsenen Grenzen beachtet, sogar noch bei der Einrichtung der französischen Départements 1795. Mit der Wahl des Flußverlaufs von Sauer und Our als Grenze zwischen Luxemburg und Preußen wurde dieses Prinzip durchbrochen und ein naturräumliches Gliederungselement als neu geschaffene Grenze gewählt. [less ▲]

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

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

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

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

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

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

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See detailA 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 detailTopologie culinaire au cinéma : le lieu commun du repas et ses déclinaison
Roelens, Nathalie UL

in Bibliothèque électronique Paris 8 (in press)

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See detailRigor or rhetoric: Public philosopher and public in dialogue
Burks, Deven UL

in Perspectives: International Postgraduate Journal of Philosophy (in press), 9

Brian Leiter (2016) throws down two gauntlets to philosophers engaged in dialogue with the broader public. If, with the first, public philosophers recognize that they cannot offer substantive answers but ... [more ▼]

Brian Leiter (2016) throws down two gauntlets to philosophers engaged in dialogue with the broader public. If, with the first, public philosophers recognize that they cannot offer substantive answers but only sophisticated method, they nevertheless fail to realize that said method does not resonate with the very public whom they purport to help. For, with the second, that method does not engage the emotivist and tribalist cast of contemporary public discourse: emotivist because a person’s moral and political beliefs are a function of emotional attitudes or affective responses for which she adduces reasons post hoc; tribalist because the person tracks not the inferential relation between beliefs but her similarity with interlocutors. In order to understand the full extent of this critique, it is necessary, first, to parse strands of public philosophy, distinct discursive sites, and pictures of philosophical practice and, then, to probe the critique’s empirical groundedness and intended scope. These elements in place, it is then possible to sketch public philosophy reconceived along Leiter’s lines as equal part rigor and rhetoric. That sketch may be somewhat filled out through two tactics employed in Jeffrey Stout’s (2004, 2010) work. These form part of a toolkit for philosophical dialogue whereby philosophers get a discursive grip on non-discursive factors underlying public discourse and push back on Leiter's dilemma. [less ▲]

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See detailFundamental rights and constitutional identity(ies): limits or parameters of the EU constitutional governance?
Zinonos, Panagiotis UL

in European Governance and Sovereignty (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 detailHistorical outline and chromatic properties of purpura rubra Tarentina and its potential identification with purple dye extracted from Bolinus brandaris
Meiers, Fabienne UL

in Enegren, Hedvig; Meo, Francesco (Eds.) Treasures from the Sea : Sea-Silk and Shell purple dye in antiquity. Proceedings from the International workshop, 26.-28.05. (in press)

This paper presents a historical overview of the importance of the red dye found in spiny dye-murices (Bolinus brandaris) and its production in Taranto, one of the most industrious Greek colonies founded ... [more ▼]

This paper presents a historical overview of the importance of the red dye found in spiny dye-murices (Bolinus brandaris) and its production in Taranto, one of the most industrious Greek colonies founded in southern Italy in the 8th century BC and renowned for its luxury products. Written evidence as well as numismatic and archaeological sources dating from the 5th century BC to the 5th century AD have been analysed in this context to identify purpura rubra Tarentina. In addition, the results of a series of dye experiments with hypobranchial glands from the same species are treated in order to detect chromatic properties and potential manufacturing processes for Tarentine Red. The methods for vatting the dye glands are discussed in relation to historical validity and chromatic outcome. To conclude, comparisons are drawn between the colour characteristics of Bolinus brandaris and Hexaplex trunculus (banded dye-murex), and the possibility of mixing both dyes is taken into consideration. The synthesis of historical and experimental approach finally shows that purpura rubra Tarentina can potentially be identified with purple dye extracted from Bolinus brandaris. [less ▲]

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See detailCoercion-Resistant Voting in Linear Time via Fully Homomorphic Encryption: Towards a Quantum-Safe Scheme
Roenne, Peter UL; Atashpendar, Arash UL; Kristian, Gjøsteen et al

in Financial Cryptography and Data Security 2019. FC 2019: International Workshops, CIW, VOTING, and WTSC (in press)

We present an approach for performing the tallying work in the coercion-resistant JCJ voting protocol, introduced by Juels, Catalano, and Jakobsson, in linear time using fully homomorphic encryption (FHE ... [more ▼]

We present an approach for performing the tallying work in the coercion-resistant JCJ voting protocol, introduced by Juels, Catalano, and Jakobsson, in linear time using fully homomorphic encryption (FHE). The suggested enhancement also paves the path towards making JCJ quantum-resistant, while leaving the underlying structure of JCJ intact. The exhaustive, comparison-based approach of JCJ using plaintext equivalence tests leads to a quadratic blow-up in the number of votes, which makes the tallying process rather impractical in realistic settings with a large number of voters. We show how the removal of invalid votes can be done in linear time via a solution based on recent advances in various FHE primitives such as hashing, zero-knowledge proofs of correct decryption, verifiable shuffles and threshold FHE. We conclude by touching upon some of the advantages and challenges of such an approach, followed by a discussion of further security and post-quantum considerations. [less ▲]

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See detailEntwicklungen der sexualwissenschaftlichen und rechtlichen Debatten zu Transsexualität und deren Verschränkungen in der Bundesrepublik Deutschland (1960er Jahre bis 1980)
De Silva, Adrian UL

in 'Auf nach Casablanca?' Lebensrealitäten transgeschlechtlicher Menschen zwischen 1945-1980 (in press)

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See detailTogether or Alone: The Price of Privacy in Collaborative Learinig
Pejo, Balazs UL; Tang, Qiang; Biczók, Gergely

in Proceedings on Privacy Enhancing Technologies (2019, July)

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training ... [more ▼]

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training dataset; in reality a small or medium sized organization often does not have the necessary data to train a reasonably accurate model. For such organizations, a realistic solution is to train their machine learning models based on their joint dataset (which is a union of the individual ones). Unfortunately, privacy concerns prevent them from straightforwardly doing so. While a number of privacy-preserving solutions exist for collaborating organizations to securely aggregate the parameters in the process of training the models, we are not aware of any work that provides a rational framework for the participants to precisely balance the privacy loss and accuracy gain in their collaboration. In this paper, by focusing on a two-player setting, we model the collaborative training process as a two-player game where each player aims to achieve higher accuracy while preserving the privacy of its own dataset. We introduce the notion of Price of Privacy, a novel approach for measuring the impact of privacy protection on the accuracy in the proposed framework. Furthermore, we develop a game-theoretical model for different player types, and then either find or prove the existence of a Nash Equilibrium with regard to the strength of privacy protection for each player. Using recommendation systems as our main use case, we demonstrate how two players can make practical use of the proposed theoretical framework, including setting up the parameters and approximating the non-trivial Nash Equilibrium. [less ▲]

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See detailNetworks and Governance of Local Food Systems. The case of Food Policy Councils
Reckinger, Rachel UL

Scientific Conference (2019, June 06)

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See detailWho’s afraid of Donkey Kong? Testing the Stereotype Threat Effect in Video Gaming
Holl, Elisabeth UL; Wagener, Gary L.; Melzer, André UL

Scientific Conference (2019, May)

In two studies (Study 1: N = 130; Study 2: N = 56) participants played a video game (Bejeweled 3; SkyChasers) and were either confronted with a stereotype threat (ST) or not. ST is defined as the risk of ... [more ▼]

In two studies (Study 1: N = 130; Study 2: N = 56) participants played a video game (Bejeweled 3; SkyChasers) and were either confronted with a stereotype threat (ST) or not. ST is defined as the risk of confirming a negative stereotype about one’s own group and has been investigated in various field, i.a. in gaming. In the first study participants were confronted with the stereotype that women would perform worse in video games than men. In the second study we worked with a reversed stereotype, namely that women would have now outpaced males in some genres of video games. Our results show that performance varies across gender and genre. Although we did not find the hypothesized interaction effect of gender and ST condition in performance, self-reported measures, such as perceived frustration, and moderating variables indicate performance differences both for women and men, but on different psychological dimensions. [less ▲]

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See detailAn Effective Hybrid Algorithm for an Extended Flexible Job Shop Scheduling Problem]{An Effective Hybrid Imperialist Competitive Algorithm and Tabu Search for an Extended Flexible Job Shop Scheduling Problem
Tessaro Lunardi, Willian UL; Voos, Holger UL; Cherri, Luiz Henrique

in 34th ACM/SIGAPP Symposium On Applied Computing, Limassol, Cyprus April 8-12, 2019 (2019, April 08)

An extended version of the flexible job shop problem is tackled in this work. The investigated extension of the classical flexible job shop problem allows the precedences between the operations to be ... [more ▼]

An extended version of the flexible job shop problem is tackled in this work. The investigated extension of the classical flexible job shop problem allows the precedences between the operations to be given by an arbitrary directed acyclic graph instead of a linear order. The problem consists of designating the operations to the machines and sequencing them in compliance with the supplied precedences. The goal in the present work is the minimization of the makespan. In order to produce reasonable outcomes in acceptable time, a hybrid imperialist competitive algorithm and tabu search is proposed to solve the problem. Numerical experiments assess the efficiency of the proposed method and compare it with well-known scheduling algorithms. [less ▲]

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See detailExploration of Different School Value-Added Models in a Highly Heterogeneous Educational Context
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, April)

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See detailFog Computing as the Key for Seamless Connectivity Handover in Future Vehicular Networks
Palattella, Maria Rita UL; Soua, Ridha UL; Abdelmajid, Khelil et al

in The 34th ACM Symposium On Applied Computing (SAC (2019, April)

With the emergence of highly automated and autonomous con-nected vehicles, rigorous requirements in terms of responsiveness,security and scalability become necessary to enable new servicesthat improve ... [more ▼]

With the emergence of highly automated and autonomous con-nected vehicles, rigorous requirements in terms of responsiveness,security and scalability become necessary to enable new servicesthat improve efficiency and safety on the road. In future networks,vehicles need to frequently perform handover procedures whilecrossing various dense heterogeneous cells, which may cause anunacceptable network service degradation. In this concept paper,we propose a fog-aided architecture for seamless handover. Fogcomputing can fill the architectural gap between clients and cloudsto manage short lived information and enable novel latency-criticalapplications at the edge of networks. Accordingly, the proposedarchitecture, along with its unified integration of virtually all de-vices (end-devices, gateways and servers) and all networks (ad hoc,access and core), supports Vehicle-to-Everything (V2X) distributedapplications with crucial needs such as time-, safety- and security-critical network functions. [less ▲]

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See detailSecurity – Visible, Yet Unseen? How Displaying Security Mechanisms Impacts User Experience and Perceived Security
Distler, Verena UL; Zollinger, Marie-Laure UL; Lallemand, Carine UL et al

in Proceedings of ACM CHI Conference on Human Factors in Computing Systems (CHI2019) (2019, April)

An unsolved debate in the field of usable security concerns whether security mechanisms should be visible, or blackboxed away from the user for the sake of usability. However, tying this question to ... [more ▼]

An unsolved debate in the field of usable security concerns whether security mechanisms should be visible, or blackboxed away from the user for the sake of usability. However, tying this question to pragmatic usability factors only might be simplistic. This study aims at researching the impact of displaying security mechanisms on user experience (UX) in the context of e-voting. Two versions of an e-voting application were designed and tested using a between-group experimental protocol (N=38). Version D displayed security mechanisms, while version ND did not reveal any security-related information. We collected data on UX using standardised evaluation scales and semi-structured interviews. Version D performed better overall in terms of UX and need fulfilment. Qualitative analysis of the interviews gives further insights into factors impacting perceived security. Our study adds to existing research suggesting a conceptual shift from usability to UX and discusses implications for designing and evaluating secure systems. [less ▲]

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See detailAVATAR: Fixing Semantic Bugs with Fix Patterns of Static Analysis Violations
Liu, Kui UL; Koyuncu, Anil UL; Dongsun, Kim et al

in Liu, Kui; Koyuncu, Anil; Dongsun, Kim (Eds.) et al The 26th IEEE International Conference on Software Analysis, Evolution, and Reengineering (SANER-2019) (2019, February 24)

Fix pattern-based patch generation is a promising direction in Automated Program Repair (APR). Notably, it has been demonstrated to produce more acceptable and correct patches than the patches obtained ... [more ▼]

Fix pattern-based patch generation is a promising direction in Automated Program Repair (APR). Notably, it has been demonstrated to produce more acceptable and correct patches than the patches obtained with mutation operators through genetic programming. The performance of pattern-based APR systems, however, depends on the fix ingredients mined from fix changes in development histories. Unfortunately, collecting a reliable set of bug fixes in repositories can be challenging. In this paper, we propose to investigate the possibility in an APR scenario of leveraging code changes that address violations by static bug detection tools. To that end, we build the AVATAR APR system, which exploits fix patterns of static analysis violations as ingredients for patch generation. Evaluated on the Defects4J benchmark, we show that, assuming a perfect localization of faults, AVATAR can generate correct patches to fix 34/39 bugs. We further find that AVATAR yields performance metrics that are comparable to that of the closely-related approaches in the literature. While AVATAR outperforms many of the state-of-the-art pattern-based APR systems, it is mostly complementary to current approaches. Overall, our study highlights the relevance of static bug finding tools as indirect contributors of fix ingredients for addressing code defects identified with functional test cases. [less ▲]

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See detailTeachers´ Attitudes toward Students with High- and Low-Educated Parents
Pit-Ten Cate, Ineke UL; Glock, Sabine UL

Scientific Conference (2019, February)

Background In several countries, school tracking is used to group students with similar academic potential to optimize instruction. Teachers often have a more or less deciding vote, which school track ... [more ▼]

Background In several countries, school tracking is used to group students with similar academic potential to optimize instruction. Teachers often have a more or less deciding vote, which school track would suit different students based on academic achievement and potential (Ansalone and Biafora, 2004). Given the differential qualifications associated with completion of the different school tracks, teachers’ abilities to correctly assign students to different tracks will not only affect the students´ educational pathways, but also has a long lasting effect on career opportunities and general wellbeing in future adult life. Research shows that tracking recommendations mainly rely on students’ abilities (e.g., Caro, et al., 2009; Klapproth, et al., 2013; Marks, 2006). However, non-academic related student characteristics such as the socioeconomic status (SES) of the parents and —closely related (Reardon, 2011)—the parental educational level also affect teachers´ tracking decisions, either indirectly via grades or directly via the tracking decision itself (Bauer and Riphahn, 2006; Caro et al., 2009; de Boer, et al., 2010; Ditton, Krüsken, and Schauenberg, 2005; Maaz, et al., 2008; Timmermans, et al., 2015; Wagner, et al., 2009). Indeed, research has provided evidence for such stereotype bias in teachers’ judgments, leading to disadvantages for certain social groups (Peterson, et al., 2016; van den Bergh, et al., 2010). Hence, the aim of our study was the investigation of teachers’ attitudes toward students in relation to the educational level of parents. Method The aim of the current study was to investigate teachers´ implicit and explicit attitudes toward students with differentially educated parents. Implicit attitudes were measured using an implicit association task (IAT). The first name of the student was used as a proxy for the educational level of parents (see Onland & Bloothooft, 2008), whereby we created separate versions for boys and girls. Participating teachers (N=70) were randomly divided in two groups whereby the first group completed the IAT-boys version and the other group the IAT-girls version. Explicit attitudes were measured using a questionnaire (adapted from Glock, et al., 2016). Results: Participants indicated positive implicit attitudes toward students with highly educated parents, independent of the gender of the student. More specifically, an independent t test revealed that the mean IAT-D scores for boys and girls did not differ, t(68)=0.47, p=.64, d=0.12. The IAT-D score for the whole sample (M=0.81, SD=0.61) was significantly different from zero, t(69)=11.14, p<.001, d=1.33, reflecting more positive implicit attitudes toward highly educated parents. Teachers did not express differential explicit beliefs regarding the learning and social behaviors of students based on the educational level of the parents (i.e., subscale scores were significantly lower than the mean of the scale, t(65)=4.26, p<.001, d=0.53), whereas their expectations concerning the motivation and ambitions or educational chances of these students were neutral. Although the three subscales within the explicit attitudes measure were substantially associated (correlations ranging from r = .39 to r =.74), no association between explicit and implicit attitudes measures was found (correlations range from r = -.07 to r = .08). Conclusion: Teachers’ attitudes seem to be an important factor, which can guide teachers´ judgments and behaviors, and could partly explain differences in educational equity for students with similar academic profiles, but differentially educated parents. The positive implicit attitudes in favor of students with highly educated parents imply more favorable judgments for and behavior toward these students and deeper work is required to ensure teachers’ fair treatment of all students. The dissociation between implicit and explicit attitudes may be an indication of the social sensitivity of the relationship between students´ social background and educational achievements and opportunities. [less ▲]

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See detailComment assurer la qualité de l’évaluation par les pairs des propositions de communication dans le cadre d’un colloque scientifique ?
Milmeister, Marianne UL; Weis, Christiane UL; Dierendonck, Christophe UL

Scientific Conference (2019, January 10)

L’évaluation par les pairs joue un rôle important dans le monde universitaire et est souvent considérée comme le garant de la qualité scientifique. En même temps, les biais qui existent pour ce type ... [more ▼]

L’évaluation par les pairs joue un rôle important dans le monde universitaire et est souvent considérée comme le garant de la qualité scientifique. En même temps, les biais qui existent pour ce type d’évaluation sont multiples (partialité des évaluateurs, divergence de jugement entre évaluateurs, etc.) et bien documentés dans la littérature. Dans le cadre d’un colloque que nous avons organisé en 2018, nous avons mené une analyse exploratoire sur la base de données des évaluations réalisées par les pairs. Le but était d’avoir une idée de la qualité de l’évaluation par les pairs, de voir dans quelle mesure on retrouve les biais relevés par la littérature scientifique et, enfin, de définir des pistes qui pourraient contribuer à améliorer la qualité de ce processus. Dans le cas de notre colloque, l’évaluation par les pairs s’est faite via une plateforme en ligne. Chaque proposition de communication était évaluée de manière anonyme par deux personnes et sur base de neuf critères pour lesquels les évaluateurs pouvaient choisir entre quatre modalités d’appréciation : très faible, faible, bon, très bon. Ensuite, l’évaluateur devait donner sa recommandation pour la contribution analysée : acceptation, acceptation sous réserve d’ajustements ou refus. Une première analyse des données montre notamment qu’il existe des différences plus ou moins importantes tant entre les jugements des évaluateurs qu’entre les décisions d’un même évaluateur. Les résultats détaillés de nos analyses seront présentés lors du colloque et des pistes d’amélioration discutées. [less ▲]

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See detailMethodological Aspects of Software Engineering, Assurance, Quality, and Reliability Engineering (MAS/AQR) 2019 Welcome from the Minitrack Co-Chairs
Tenbergen, Bastian; Ries, Benoît UL

in Proceedings of the 52nd Hawaii International Conference on System Sciences (HICSS) (2019, January)

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See detailFeasibility Analysis of Blockchain for Donation-based Crowdfunding of Ethical Projects
Khan, Nida UL; Ouaich, Rachid

in Springer Smart Technologies and Innovation for a Sustainable Future. Advances in Science, Technology & Innovation (IEREK Interdisciplinary Series for Sustainable Development). (2019)

Donation is a necessary social tool that is plagued by many inherent shortcomings. A novel model in the form of a decentralized app was designed in the Ethereum blockchain to solve the challenges present ... [more ▼]

Donation is a necessary social tool that is plagued by many inherent shortcomings. A novel model in the form of a decentralized app was designed in the Ethereum blockchain to solve the challenges present and optimize the process of Zakaah donation. Load and stress tests on the prototype of the smart contract in the public testnet of Ethereum were analyzed to gauge the feasibility of mass usage. Similar tests were done in Hyperledger to conclude on the optimum blockchain platform for Zakaah. An anomaly was detected during the testing phase of the decentralized app in the public testnet of Ethereum and it was exploited to propose a novel strategy to enhance the throughput of Ethereum. The testing is a pioneer in evaluating the throughput and feasibility of a blockchain based financial product and provides a benchmark to validate the business and technical hypotheses of other similar financial products and services. [less ▲]

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See detailNegotiating the past, present, and future: The Luxembourgish Jewish Museum Project as a Process of Contested memory and imagined futures
Badder, Anastasia UL; Bronec, Jakub UL

Scientific Conference (2019)

There is currently a project underway to establish a Jewish museum in Luxembourg in a restored synagogue just outside the main city center. As this project unfolds, it provides a clear view into the ... [more ▼]

There is currently a project underway to establish a Jewish museum in Luxembourg in a restored synagogue just outside the main city center. As this project unfolds, it provides a clear view into the contestations and negotiations over meaning, representation, Jewishness, and the past, present, and future visions of community that arise in the development of a museum. Ongoing debates over which objects will be included in the museum, how they will be defined, how they will link to other sites of Jewish heritage around the city (through tours, performances, reference, etc.), as well as a hesitancy by many to donate family objects all point to issues around the construction of collective memory, communal cultural heritage, and multiple narratives of the past and how these are erased in the process of producing heritage as a series of museum objects. These debates also highlight concerns about how the contemporary community – which is multilingual, multinational, and multi-denominational – will be represented; in other words, who will be included in representations of the community and how will the contemporary community be defined, if at all? Finally, ongoing discussions around what will be emphasized or downplayed indicate the contested nature, not only of the past, but also of collective visions of the future as constituted through representations of heritage. In particular, negotiations over how to represent the Holocaust reflect a desire by some to fit the museum into developing narratives of cosmopolitanism, interfaith, and intercultural relations and a drive by others to represent family narratives and engage in a project ‘against forgetting’ in order to ensure a particular kind of future. And so, using this project as a case study, I seek to draw attention to the ways in which the construction of a heritage regime is at once a negotiation over narratives of the past, shared present identities, and collective visions of the future and the discourses and social processes at work within these debates. [less ▲]

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See detailNature et modernité : réflexions théoriques suivies d’une lecture écologique de Fenn Kaß
Thiltges, Sébastian UL

in Millim, Anne-Marie; Toffoli, Ian (Eds.) Modernismen in Luxemburg: Traditionen - Variationen - Brüche (2019)

The current environmental concerns call upon a revaluation of the concept of modernity which, a century ago, has been proven to be a major cultural and aesthetic reference. Modernist writers took up new ... [more ▼]

The current environmental concerns call upon a revaluation of the concept of modernity which, a century ago, has been proven to be a major cultural and aesthetic reference. Modernist writers took up new subjects, like industry and urbanism, as an alternative to homeland literature’s depiction of earth and soil. Batty Weber depicts in Fenn Kaß (1913) the life of a defrocked priest who leaves his native countryside to become an engineer abroad. Seemingly a novel about modernity, the book also contains several descriptions of the protagonist’s relation to the natural environment, using repeatedly the metaphor of a liquid and dissolving body. By defining both interrelated concepts of nature and modernity, this paper provides an anthropological reading of texts, questioning how salient poetical motives can challenge sociological and epistemological contextualisation. [less ▲]

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See detailTRANSMISSION OF COLLECTIVE MEMORY AND JEWISH IDENTITY IN POSTWAR JEWISH GENERATIONS THROUGH WAR SOUVENIRS
Bronec, Jakub UL

in International 26th annual CIDOC - ICOM Conference in 2018 (2019)

My contribution includes a sample of testimonies containing the life stories of Jews born in the aftermath of World War II in two countries (Czechoslovakia and Luxembourg). At that time, Czechoslovakian ... [more ▼]

My contribution includes a sample of testimonies containing the life stories of Jews born in the aftermath of World War II in two countries (Czechoslovakia and Luxembourg). At that time, Czechoslovakian Jews were living through the era of de-Stalinisation, and their narratives offer new insights into this segment of Jewish postwar history that differ from those of Jews living in liberal democratic European states. Based on personal documents, photos, letters and souvenirs, the conducted interviews highlight an interesting way of maintaining personal memories in Jewish families and how this varies from one generation to the next. In my contribution, I am planning to illustrate the importance of these small artefacts for the transmission of Jewish collective memory. My presentation showcases people widely referred to as the “second and third Jewish generation”, their attitude to current notions of Jewish memory and self-perception and their role in society. Some had to live under totalitarian oppression, others had to face a wave of Jewish Sephardic immigrants coming from overseas – and witnesses admit that the arrival of these newcomers often caused difficulties in Jewish communities. Small objects from the war, often displayed in their households, serve as a reminder of their roots and destiny, which should not be forgotten. This paper is a part of my broader research project examining distinctions and similarities in identity formation through generations of Czech, Slovak, French and Luxembourgish Jews, who grew up either under communism or in liberal Western Europe. The aim is to create an international virtual library and cloud storage, not only for professional educators but also for the public. [less ▲]

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See detailDigital Resources and Tools in Historical Research
Zaagsma, Gerben UL; Wieneke, Lars UL

in Kollmann, Stefanie; Müller, Lars; Reh, Sabine (Eds.) et al Picture archives and the emergence of visual history of education. ISCHE 40 pre-conference workshop. 3rd workshop "Pictura Paedagogica Online: educational knowledge in images (2018, December 21)

One of the characteristic features of modern life is the omnipresence of images - in public life as well as in the private surroundings. At latest with coining the term "Visual history" at the beginning ... [more ▼]

One of the characteristic features of modern life is the omnipresence of images - in public life as well as in the private surroundings. At latest with coining the term "Visual history" at the beginning of the nineteen nineties historical disciplines are dealing with this ever growing pool of pictorial sources. This is also true for educational history - especially when keeping in mind that the use of images in an educational context is common practice since early modern ages. This concerns the presentation practices, the design of didactic visual media and their use in educational practice as well as the illustrated traces of historical educational practice and historical educational knowledge (e.g. photographs of school buildings or educational scenes). There are various digital picture archives to address the research questions of many historical disciplines. These databases, though, differ widely in purpose and design - and of course they cannot serve every scientific demand. According to Gerhard Paul there should be at least four layers of information evaluation when analysing historical images (reality of depiction, genesis, use and impact). Thus, building up a corpus of image sources with sufficient accompanying information can be quite challenging. As major topic the Pre-Conference Workshop will focus on the impact of the discipline on developing and maintaining of a picture archive. (DIPF/Orig.) [less ▲]

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See detailGeschlechter(re)konstruktionen in Autobiographien transgeschlechtlicher Menschen - Namenskunde
Artuso, Sandy Kathy UL

Scientific Conference (2018, December 12)

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See detailCan we automate away the main challenges of end-to-end testing?
Rwemalika, Renaud UL; Kintis, Marinos UL; Papadakis, Mike UL et al

Scientific Conference (2018, December 11)

Agile methodologies enable companies to drastically increase software release pace and reduce time-to-market. In a rapidly changing environment, testing becomes a cornerstone of the software development ... [more ▼]

Agile methodologies enable companies to drastically increase software release pace and reduce time-to-market. In a rapidly changing environment, testing becomes a cornerstone of the software development process, guarding the system code base from the insertion of faults. To cater for this, many companies are migrating manual end-to-end tests to automated ones. This migration introduces several challenges to the practitioners. These challenges relate to difficulties in the creation of the automated tests, their maintenance and the evolution of the test code base. In this position paper, we discuss our preliminary results on such challenges and present two potential solutions to these problems, focusing on keyword-driven end-to-end tests. Our solutions leverage existing software artifacts, namely the test suite and an automatically-created model of the system under test, to support the evolution of keyword-driven test suites. [less ▲]

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See detailModelling Scale in Historiographical Data
Armaselu, Florentina UL

Scientific Conference (2018, December 09)

The project will investigate the meaning of scale in historical writings, and more precisely how scale is expressed through language in historical discourse. This question draws attention to the ... [more ▼]

The project will investigate the meaning of scale in historical writings, and more precisely how scale is expressed through language in historical discourse. This question draws attention to the conceptual and linguistic mechanisms at play in building historical knowledge, when the historian moves between different layers of analysis, narration or consulted sources, involving different degrees of generality. A small historiographical corpus, in which variations of scale are clearly present, will serve to develop the digital approach/tools/methodology. Depending on the findings of the project, an extension of the research to other types of corpora is envisaged. The paper presents a workflow and first experiments using topic modelling to analyse scale representation in historiographical data. Further experiments with more documents, other models and visualisation tools, as well as eventually creating a pipeline for semi-automatic restructuration of data as zoomable texts are also envisaged. [less ▲]

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See detailEin (un)möglicher Dialog? Überlegungen zum Verhältnis von Historikern und Schriftstellern in Ostbelgien
Brüll, Christoph UL

Scientific Conference (2018, December 07)

Künstlerische Freiheit versus Wahrheitsanspruch, Klio als Dichterin, Geschichtsschreibung als eine Form von literarischer Erzählung? Natürlich könnte auch die Historiographie zum heutigen Ostbelgien durch ... [more ▼]

Künstlerische Freiheit versus Wahrheitsanspruch, Klio als Dichterin, Geschichtsschreibung als eine Form von literarischer Erzählung? Natürlich könnte auch die Historiographie zum heutigen Ostbelgien durch die Brille dieser Debatten gelesen werden. Der durch eine Frage herausgehobene Gegenstand des Beitrags ist jedoch pragmatischer gefasst: er geht von der Beobachtung aus, dass zahlreiche literarische Publikationen über Ostbelgien bzw. aus der Feder von ostbelgischen Autoren eine Sicht auf die bewegte Vergangenheit der Region transportieren, dass dies jedoch nie zu einem Dialog zwischen den Schriftstellern und den Historikern in der Region geführt hat. Gefragt wird nach den Gründen für einen unmöglichen Dialog und den Bedingungen für eine mögliche Kommunikation. Dazu werden einerseits ausgewählte Schriften und öffentliche Interventionen (vor allem in den regionalen Medien) bekannter ostbelgischer Autoren auf ihr Geschichtsbild untersucht, andererseits jedoch auch – durchaus in der Form der Selbstbeobachtung – die Mobilisierung literarischer Erzeugnisse durch die historische Forschung analysiert. Überprüft werden soll zudem, inwiefern generationelle Faktoren als Erklärung für die Ausgangshypothese ausgemacht werden können. In einem letzten Schritt sollen dann Überlegungen angestellt werden, wie ein Dialog hergestellt werden könnte. Dass hierbei den Polen Öffnung und identitärer Rückzug eine bedeutende Rolle zukommt, überrascht nicht, macht jedoch die derzeitige Abwesenheit von Dialog und Auseinandersetzung umso erklärungsbedürftiger. [less ▲]

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See detailGender differences in risk factors for suicidal behaviours in adolescents
van Duin, Claire UL; Catunda, Carolina UL; Heinz, Andreas UL et al

Scientific Conference (2018, December 07)

Introduction: As the second leading cause of death among young people suicide is a severe public health problem. Previous studies have indicated that risk factors for suicidal behaviours differ for males ... [more ▼]

Introduction: As the second leading cause of death among young people suicide is a severe public health problem. Previous studies have indicated that risk factors for suicidal behaviours differ for males and females, although it remains uncertain whether gender predicts suicidal behaviors. The 2014 HBSC study in Luxembourg has gathered data on the suicidal ideation sequence in adolescents and can contribute to these issues. Purpose: The objective of this study was to examine gender differences within the risk factors for suicidal behaviours within the adolescent population of Luxembourg. Materials and Methods: Data on suicidal ideation among adolescents was collected through written survey. Data from secondary school students aged 12 to 18 was used (N=5595). Bivariate logistic regressions were conducted in order to identify risk factors for the dependent variables of “sadness”, “considering suicide”, “planning suicide” and “suicide attempt” in the last twelve months. Subsequently, multivariate logistic regressions were performed split by gender. 24 independent variables were included in the models. Results: The three significant variables that added most to the models for “sadness” and “suicide attempt” are named. For boys, the odds for sadness were impacted by the number of health complaints (OR: 1.4 for each additional health complaint; CI: 1.4-1.6), life satisfaction (OR: 1.2 for each additional unit; CI: 1.2-1.3) and body image (OR: 1.6 for too thin; CI: 1.1-2.3; OR: 1.7 for too fat; CI: 1.3-2.3). For girls, the variables were the number of health complaints (OR: 1.4; CI: 1.3-1.4), life satisfaction (OR: 1.3; CI: 1.2-1.4) and sexual abuse (OR: 2.5; CI: 2.0-3.1). Considering suicide attempts, for boys the odds were impacted by the physical fighting (OR: 2.9 for 4 fights or more; CI: 1.5-5.5), life satisfaction (OR: 1.2; CI: 1.3-2.1) and substance use (OR: 1.7; CI: 1.3-2.1). For girls, the number of health complaints (OR: 1.3, CI: 1.2-1.4), life satisfaction (OR: 1.3; CI: 1.2-1.4) and type of school (OR: 3.7 for secondary technique; CI: 2.1-5.0) impacted the odds. Conclusion: This study has indicated that differences in risk factors between the genders increase as the severity of suicidal behavior increases. This highlights the need for distinct strategies for the prevention of suicide behaviours that are suitable for the different genders, and their respective risk factors. [less ▲]

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See detailLSRepair: Live Search of Fix Ingredients for Automated Program Repair
Liu, Kui UL; Koyuncu, Anil UL; Kim, Kisub UL et al

Scientific Conference (2018, December 07)

Automated program repair (APR) has extensively been developed by leveraging search-based techniques, in which fix ingredients are explored and identified in different granularities from a specific search ... [more ▼]

Automated program repair (APR) has extensively been developed by leveraging search-based techniques, in which fix ingredients are explored and identified in different granularities from a specific search space. State-of-the approaches often find fix ingredients by using mutation operators or leveraging manually-crafted templates. We argue that the fix ingredients can be searched in an online mode, leveraging code search techniques to find potentially-fixed versions of buggy code fragments from which repair actions can be extracted. In this study, we present an APR tool, LSRepair, that automatically explores code repositories to search for fix ingredients at the method-level granularity with three strategies of similar code search. Our preliminary evaluation shows that code search can drive a faster fix process (some bugs are fixed in a few seconds). LSRepair helps repair 19 bugs from the Defects4J benchmark successfully. We expect our approach to open new directions for fixing multiple-lines bugs. [less ▲]

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See detailSuicide Prevention in Luxembourg: Using the HBSC Symptom Checklist as an Alternative Tool for Screening
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Poster (2018, December 07)

Introduction: Suicide is one of the leading causes of death of young people and as such, screening for suicidal ideation is a major public health concern. However, there is fear that exposure to suicide ... [more ▼]

Introduction: Suicide is one of the leading causes of death of young people and as such, screening for suicidal ideation is a major public health concern. However, there is fear that exposure to suicide-related content would encourage suicide attempt. This false idea is a great barrier to effectively screen. Hence, the need for tools without suicide content. Purpose: The goal of this study is to present a short tool that could be helpful for suicide screening and prevention. Materials and Methods: This study is based on the 2014 HBSC Luxembourg survey. A total of 5595 students aged from 12 to 18 years old in secondary school responded to a questionnaire translated to both French and German. Among others, it included the HBSC Symptom Checklist, a scale developed to measure eight health complaints (headache, abdominal pain, backache, feeling low, irritability, feeling nervous, sleeping difficulties and dizziness), as well as 4 questions asked in a logical sequence concerning sadness, suicide ideation, suicide planning and suicide attempt. Results: Multivariate Logistic Regression analyses with 24 potential indicators showed the number of health complaints as the most predictive indicator for suicide attempt (OR=1.248; C.I.: 1.175-1.325). Following, a significant ROC curve (area under the curve of 0.76; sensitivity=0.68 and specificity=0.73) and Youden Index (0.41) indicates the optimum cut-off at three complaints, with a predictive value of 17%. An alternative cut off point at four (sensitivity=0.57 and specificity=0.82; Youden Index of 0.39) has a predictive value of 21%. Conclusion: The HBSC Symptom Checklist seems to be a good predictor as each additional health complaint increases the risk of suicide attempt by 25%. In addition, it could be an alternative to traditional suicide screening measures, as its sensitivity, specificity and predictive values are similar to measures more commonly used, such as the Columbia Suicide Screen or the Beck Depression Inventory. Further work should be invested to validate the HBSC Symptom Checklist as a screening tool for suicide prevention. [less ▲]

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See detailCannabis Use during Adolescence: An Overview in Luxembourg and in Comparison to other European Countries
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Scientific Conference (2018, December 06)

Introduction: Cannabis is the most widely consumed illegal drug worldwide. The use of cannabis is a risk factor for mental illnesses, but also for social problems such as lower educational attainment and ... [more ▼]

Introduction: Cannabis is the most widely consumed illegal drug worldwide. The use of cannabis is a risk factor for mental illnesses, but also for social problems such as lower educational attainment and the use of other drugs. Consumption is considered particularly harmful if it starts early in adolescence, if in a high-dose and if it continues on a regular basis. Purpose: This study aims to give an overview on adolescents’ cannabis consumption in Luxembourg (how often and when they started consuming cannabis) and in comparison with other European countries. Materials and Methods: In 2014, 3461 students in secondary school took part in the HBSC study. The questionnaire translated to both French and German. They answered, among other health related questions, about their cannabis use (30 days and lifetime prevalence), as well as when they started consuming it. Results: Two groups were formed: 15-16 and 17-18 years old. In the 15-16 group, 11.2% used cannabis in the past 30 days and 21.7% tried it at least once in their lives. In the age group of 17-18, 15.2% stated using it in the last month and 38% in lifetime. Regarding the use in the past 30 days split by gender, the prevalence for girls is 8.9% and 13.8% for boys (15-16 age group) and 10.6% and 20.1% respectively (17-18 year-olds). The lifetime prevalence for 15-16 years old is 18% for both girls and boys, higher than the 13% HBSC participant countries (mostly European) mean for girls and 17% for boys. Finally, about the age they first tried cannabis, 6.8% of boys and 5.3% of girls responded the age of 12 (or younger), a similar ascendant curve is found and the prevalence of 25% for boys is reached at the age of 14 years, as for girls it is at 14.2 years old. Conclusion: First, our results highlight the differences between the 30-day versus lifetime consumption, indicating the latter is much more widespread than the regular consumption. Secondly, the older the students are, the higher the proportion of cannabis users, for both boys and girls, with regular consumption being more frequent among boys. In addition, consumption in a lifetime in Luxembourg is higher than other Europeans countries. Finally, a quarter of consumers started at the age of 14 or younger. This data indicates not only that prevention programs still are in need, but they should start early. [less ▲]

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See detailA Memory-Based Label Propagation Algorithm for Community Detection
Fiscarelli, Antonio Maria UL; Brust, Matthias UL; Danoy, Grégoire UL et al

in Aiello, Luca Maria; Cherifi, Chantal; Cherifi, Hocine (Eds.) et al Complex Networks and Their Applications VII (2018, December 02)

The objective of a community detection algorithm is to group similar nodes in a network into communities, while increasing the dis- similarity between them. Several methods have been proposed but many of ... [more ▼]

The objective of a community detection algorithm is to group similar nodes in a network into communities, while increasing the dis- similarity between them. Several methods have been proposed but many of them are not suitable for large-scale networks because they have high complexity and use global knowledge. The Label Propagation Algorithm (LPA) assigns a unique label to every node and propagates the labels locally, while applying the majority rule to reach a consensus. Nodes which share the same label are then grouped into communities. Although LPA excels with near linear execution time, it gets easily stuck in local optima and often returns a single giant community. To overcome these problems we propose MemLPA, a novel LPA where each node imple- ments memory and the decision rule takes past states of the network into account. We demonstrate through extensive experiments on the Lancichinetti-Fortunato-Radicchi benchmark and a set of real-world net- works that MemLPA outperforms most of state-of-the-art community detection algorithms. [less ▲]

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See detailPower and Load Optimization in Interference-Coupled Non-Orthogonal Multiple Access Networks
Lei, Lei UL; You, Lei; Yang, Yang UL et al

in IEEE Global Communications Conference (GLOBECOM) 2018 (2018, December)

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See detailMicrobiome: the environment within
Wilmes, Paul UL

Scientific Conference (2018, December)

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See detailSystems ecology of microbiomes
Wilmes, Paul UL

Scientific Conference (2018, December)

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See detailRobust Precoding and Beamforming in a Multiple Gateway Multibeam Satellite System
Joroughi, Vahid UL; Shankar, Bhavani UL; Maleki, Sina UL et al

in Robust Precoding and Beamforming in a Multiple Gateway Multibeam Satellite System (2018, December)

This paper aims to design joint precoding and onboard beamforming at a multiple gateway multibeam satellite system. Full frequency reuse pattern is considered among the beams and each gateway serves a ... [more ▼]

This paper aims to design joint precoding and onboard beamforming at a multiple gateway multibeam satellite system. Full frequency reuse pattern is considered among the beams and each gateway serves a cluster of adjacent beams such that multiple clusters are served through a set of gateways. However, two issues are required to be addressed. First, the interference in both user and feeder links is the bottleneck of the whole system and employing interference mitigation techniques is essential. Second, as the data demand increases, the ground and space segments should employ extensive bandwidth resources in the feeder link accordingly. This entails embedding an extra number of gateways aiming to support a fair balance between the increasing demand and the corresponding required feeder link resources. To tackle these problems, this paper studies the impact of employing a joint multiple gateway architecture and on-board beamforming scheme. It is shown that by properly designing the on-board beamforming scheme, the number of gateways can be kept affordable even if the data demand increases. The proposed beamforming scheme can partially mitigate the interference in the user link. While the user and feeder link channels vary over time, this paper focuses on designing fixed beamforming which is sufficiently robust to the variations in both channels, leading to keep payload complexity low. Moreover, Zero Forcing precoding technique is employed at the gateways to reject the interference in the feeder links as well as it helps the proposed fixed on-board beamforming by partially equalizing the interference in user link. [less ▲]

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See detailSequential Resource Distribution Technique for Multi-User OFDM-SWIPT based Cooperative Networks
Gautam, Sumit UL; Lagunas, Eva UL; Chatzinotas, Symeon UL et al

Scientific Conference (2018, December)

In this paper, we investigate resource allocation and relay selection in a dual-hop orthogonal frequency division multiplexing (OFDM)-based multi-user network where amplify-and-forward (AF) enabled relays ... [more ▼]

In this paper, we investigate resource allocation and relay selection in a dual-hop orthogonal frequency division multiplexing (OFDM)-based multi-user network where amplify-and-forward (AF) enabled relays facilitate simultaneous wireless information and power transfer (SWIPT) to the end-users. In this context, we address an optimization problem to maximize the end-users’ sum-rate subjected to transmit power and harvested energy constraints. Furthermore, the problem is formulated for both time-switching (TS) and power-splitting (PS) SWIPT schemes.We aim at optimizing the users’ SWIPT splitting factors as well as sub-carrier–destination assignment, sub-carrier pairing, and relay–destination coupling metrics. This kind of joint evaluation is combinatorial in nature with non-linear structure involving mixed-integer programming. In this vein, we propose a sub-optimal low complex sequential resource distribution (SRD) method to solve the aforementioned problem. The performance of the proposed SRD technique is compared with a semi-random resource allocation and relay selection approach. Simulation results reveal the benefits of the proposed design under several parameter values with various operating conditions to illustrate the efficiency of SWIPT schemes for the proposed techniques. [less ▲]

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See detailCollaborative Data Delivery for Smart City-oriented Mobile Crowdsensing Systems
Vitello, Piergiorgio; Capponi, Andrea UL; Fiandrino, Claudio UL et al

in IEEE Global Communications Conference (GLOBECOM), Abu Dhabi, UAE, 2018 (2018, December)

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing ... [more ▼]

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing infrastructures. In typical MCS systems, sensing tasks are allocated and reported on individual-basis. In this paper, we investigate on collaboration among users for data delivery as it brings a number of benefits for both users and sensing campaign organizers and leads to better coordination and use of resources. By taking advantage from proximity, users can employ device-to-device (D2D) communications like Wi-Fi Direct that are more energy efficient than 3G/4G technology. In such scenario, once a group is set, one of its member is elected to be the owner and perform data forwarding to the collector. The efficiency of forming groups and electing suitable owners defines the efficiency of the whole collaborative-based system. This paper proposes three policies optimized for MCS that are compliant with current Android implementation of Wi-Fi Direct. The evaluation results, obtained using CrowdSenSim simulator, demonstrate that collaborative-based approaches outperform significantly individual-based approaches. [less ▲]

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See detailQoS-Constrained Sum-Harvested Energy Maximization in OFDMA-based Wireless Cooperative Networks
Gautam, Sumit UL; Lagunas, Eva UL; Vuppala, Satyanarayana UL et al

Scientific Conference (2018, December)

We investigate the performances of the time-switching (TS) and power-splitting (PS) based energy harvesting models in a two-hop relay assisted network where the end-users are capable of decoding ... [more ▼]

We investigate the performances of the time-switching (TS) and power-splitting (PS) based energy harvesting models in a two-hop relay assisted network where the end-users are capable of decoding information and harvesting energy concurrently. In particular, we consider joint resource allocation and relay selection to realize Simultaneous Wireless Transmission of Information and Energy (Wi-TIE) in a multi-carrier multi-user cooperative system where the relays employ the amplify-and-forward (AF) protocol. First, we formulate based on the TS and PS Wi-TIE architectures an optimization problem to maximize the sum of energy harvested at the end-users, taking into consideration each user's quality-of-service (QoS) requirement as well as power constraints at the transmit and relaying nodes. We then solve the formulated problem to optimize the users' Wi-TIE splitting factors along with relay-user coupling, sub-carrier-user assignment, sub-carrier pairing, and power allocation. Finally, we demonstrate the benefits of the proposed framework via numerical results. [less ▲]

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See detailWealth inequality, frailty, and memory impairment: Is wealthier = healthier true at all older ages?
Leist, Anja UL

Scientific Conference (2018, December)

Detailed reference viewed: 18 (0 UL)
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See detailHealth access and wealth: Does capital structure matter?
Paccoud, Ivana; Leist, Anja UL

Scientific Conference (2018, December)

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See detailKnowledge Graph-based Core Concept Identification in Learning Resources
Manrique, Rubén; Grevisse, Christian UL; Mariño, Olga et al

in 8th Joint International Conference, JIST 2018, Awaji, Japan, November 26–28, 2018, Proceedings (2018, December)

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support ... [more ▼]

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support systems. We present a set of strategies for core concept identification on the basis of a semantic representation built using the open and available knowledge in the so-called Knowledge Graphs (KGs). Different unsupervised weighting strategies, as well as a supervised method that operates on the semantic representation, were implemented for core concept identification. In order to test the effectiveness of the proposed strategies, a human-expert annotated dataset of 96 learning resources extracted from MOOCs was built. In our experiments, we show the capacity of the semantic representation for the core-concept identification task as well as the superiority of the supervised method. [less ▲]

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See detailClosed-Form Solution for Computationally Efficient Symbol-Level Precoding
Krivochiza, Jevgenij UL; Merlano Duncan, Juan Carlos UL; Andrenacci, Stefano UL et al

Scientific Conference (2018, December)

We present a convex optimization based Symbol-Level Precoding (SLP) for sum power minimization and propose the low-latency closed-form algorithm to find a heuristic solution to the optimization problem ... [more ▼]

We present a convex optimization based Symbol-Level Precoding (SLP) for sum power minimization and propose the low-latency closed-form algorithm to find a heuristic solution to the optimization problem. The technique exploits constructive interference at the multi-user MIMO systems and minimizes the sum power of the transmitted precoded signal per each symbol slot. As a result, the received signals gain extra Signal-to-Noise Ratio (SNR), which leads to the improved data rate and energy efficiency. We benchmark the low-complexity algorithm for solving the optimization technique against the conventional Fast Non-Negative Least Squares algorithm (NNLS). The demonstrated design of the SLP technique combined with the proposed closed-form algorithm has low computational complexity and fast processing time, which is applicable in low-latency high-throughput satellite communication systems. [less ▲]

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See detailOsiris: Hunting for Integer Bugs in Ethereum Smart Contracts
Ferreira Torres, Christof UL; Schütte, Julian; State, Radu UL

in 34th Annual Computer Security Applications Conference (ACSAC ’18), San Juan, Puerto Rico, USA, December 3-7, 2018 (2018, December)

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed ... [more ▼]

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed once deployed to the blockchain. They typically implement the business logic of distributed apps and carry billions of dollars worth of coins. In that respect, it is imperative that smart contracts are correct and have no vulnerabilities or bugs. However, research has identified different classes of vulnerabilities in smart contracts, some of which led to prominent multi-million dollar fraud cases. In this paper we focus on vulnerabilities related to integer bugs, a class of bugs that is particularly difficult to avoid due to some characteristics of the Ethereum Virtual Machine and the Solidity programming language. In this paper we introduce Osiris – a framework that combines symbolic execution and taint analysis, in order to accurately find integer bugs in Ethereum smart contracts. Osiris detects a greater range of bugs than existing tools, while providing a better specificity of its detection. We have evaluated its performance on a large experimental dataset containing more than 1.2 million smart contracts. We found that 42,108 contracts contain integer bugs. Be- sides being able to identify several vulnerabilities that have been reported in the past few months, we were also able to identify a yet unknown critical vulnerability in a couple of smart contracts that are currently deployed on the Ethereum blockchain. [less ▲]

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See detailBiomechanical testing of osteotomy plates
Maas, Stefan UL; Diffo Kaze, Arnaud UL

Scientific Conference (2018, November 30)

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See detailBlockPGP: A Blockchain-based Framework for PGP Key Servers
Yakubov, Alexander UL; Shbair, Wazen UL; State, Radu UL

in The Sixth International Symposium on Computing and Networking (2018, November 28)

Pretty Good Privacy (PGP) is one of the most prominent cryptographic standards, offering end-to-end encryption for email messages and other sensitive information. PGP allows to verify the identity of the ... [more ▼]

Pretty Good Privacy (PGP) is one of the most prominent cryptographic standards, offering end-to-end encryption for email messages and other sensitive information. PGP allows to verify the identity of the correspondent in information exchange as well as the information integrity. It implements asymmetric encryption with certificates shared through a network of PGP key servers. Many recent breaches show that certificate infrastructure can be compromised as well as exposed to operational errors. In this paper, we propose a new PGP management framework with the key server infrastructure implemented using blockchain technology. Our framework resolves some problems of PGP key servers focusing in particular on fast propagation of certificate revocation among key servers and elimination of man-in-the-middle risk. We also provided user access right control where only the certificate holder can change information related to the certificate. We designed and developed a prototype for key server deployment on permissioned Ethereum blockchain. Permissioned blockchain should allow to control the costs of PGP key server infrastructure maintenance at the present level. [less ▲]

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See detailHeterogeneity of beliefs in experimental asset markets revisited
Neugebauer, Tibor UL

Scientific Conference (2018, November 28)

We study the question if we can recover original traders’ price expectations in experimental asset markets if subjects receive the same pre-recorded information. Our results show reliable recovery of ... [more ▼]

We study the question if we can recover original traders’ price expectations in experimental asset markets if subjects receive the same pre-recorded information. Our results show reliable recovery of original traders’ median expectations across treatments. Treatment comparison suggests no effect on beliefs of subjects’ action space, whether subjects trade, act as price takers or only observe the market. Our results also suggest that we are unable to recover the individual expectations beyond the median expectation. Hence, we confirm the advanced observation of the experimental literature that expectations are heterogeneous and markets do not homogenize beliefs. [less ▲]

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See detailHoneyPAKEs
Lopez Becerra, José Miguel UL; Roenne, Peter UL; Ryan, Peter UL et al

in Security Protocols XXVI: Lecture Notes in Computer Science (2018, November 27)

We combine two security mechanisms: using a Password-based Authenticated Key Establishment (PAKE) protocol to protect the password for access control and the Honeywords construction of Juels and Rivest to ... [more ▼]

We combine two security mechanisms: using a Password-based Authenticated Key Establishment (PAKE) protocol to protect the password for access control and the Honeywords construction of Juels and Rivest to detect loss of password files. The resulting construction combines the properties of both mechanisms: ensuring that the password is intrinsically protected by the PAKE protocol during transmission and the Honeywords mechanisms for detecting attempts to exploit a compromised password file. Our constructions lead very naturally to two factor type protocols. An enhanced version of our protocol further provides protection against a compromised login server by ensuring that it does not learn the index to the true password. [less ▲]

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See detailA Novel Approach to Joint User Selection and Precoding for Multiuser MISO Downlink Channels
Bandi, Ashok UL

in Bandi, Ashok; Shankar, Bhavani; maleki, Sina (Eds.) et al 6th IEEE Global Conference on Signal and Information Processing, November 26–29, 2018 Anaheim, California, USA (2018, November 26)

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See detailIst Solfège gute Musik? Ein musikpädagogischer Ansatz zwischen Ästhetik und Selbstzweck
Sagrillo, Damien UL

Scientific Conference (2018, November 24)

Als Guido von Arezzo vor einem knappen Jahrtausend mit der Erfindung des Liniensystems aufwartete und Tonsilben aus den Angangsbuchstaben des Johannes-Hymnus ableitete, revolutionierte er damit die ... [more ▼]

Als Guido von Arezzo vor einem knappen Jahrtausend mit der Erfindung des Liniensystems aufwartete und Tonsilben aus den Angangsbuchstaben des Johannes-Hymnus ableitete, revolutionierte er damit die musikalische Bildung: Er ersetzte absurdes Auswendiglernen von (Kirchen-)Gesängen durch eine erlernbare, mechanische Lesetechnik. Er konnte wohl nicht ahnen, dass nach fast tausend Jahren „seine“ Methode immer noch Anwendung findet. In meinem Vortrag werde ich aufzeigen, wie Solfège, zum einen, durchaus musikästhetisch verortet ist, während, auf der anderen Seite, eben diese Methode der mechanischen Lesbarkeit, bar jedes musikästhetischen Anspruchs, den Musikpädagogen Kopfzerbrechen bereitet. [less ▲]

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See detailPréparer les futurs enseignants à l’utilisation stratégique des TICE: Une approche par projet
Busana, Gilbert UL; Reuter, Bob UL

Scientific Conference (2018, November 23)

Étant donné (1) le besoin d'enseignants désireux et capables de concevoir et de mettre en œuvre de façon fondée et réfléchie des pratiques techno-pédagogiques dans les écoles et (2) la rareté actuelle des ... [more ▼]

Étant donné (1) le besoin d'enseignants désireux et capables de concevoir et de mettre en œuvre de façon fondée et réfléchie des pratiques techno-pédagogiques dans les écoles et (2) la rareté actuelle des utilisations stratégiques des TIC dans les écoles au Luxembourg, le manque de compétences déclarées et la faible confiance des enseignants lorsqu'il s'agit d'enseigner avec les TIC (Reuter, Busana & Linckels, 2016), nous avons conçu, mis en œuvre et testé, dans la formation initiale des futurs enseignants de l’enseignement fondamental, une approche par projet pour le développement de compétences TICE. Nous demandons aux étudiants (1) d'explorer activement des problèmes pédagogiques réels, (2) de passer en revue les solutions pédagogiques existantes et les technologies potentiellement utiles, (3) de développer un scénario pédagogique original enrichi par les TIC et ayant une valeur ajoutée projetée selon le modèle SAMR (Puentedura, 2013), (4) de le mettre en œuvre dans un contexte scolaire réel, (5) de documenter, analyser et évaluer les activités d'apprentissage et d'enseignement mises en pratique, (6) de réfléchir sur base de connaissances scientifiques et de sagesses pédagogiques existantes et (7) de rapporter, par écrit et oralement, leurs expériences à un public authentique de pairs et de membres de la communauté scolaire. L'ensemble du processus a pour but d'engager les étudiants, de les faire travailler sur un projet dont ils sont les auteurs, de favoriser la collaboration, de mettre en place des apprentissages authentiques et orientés vers la pratique professionnelle et de leur permettre d'appliquer concrètement des concepts théoriques, comme la taxonomie des objectifs d'apprentissage de Bloom (Anderson & Krathwohl, 2001), la taxonomie des événements d'apprentissage et d'enseignement (Verpoorten, Poumay & Leclercq, 2008) et les stratégies d'intégration technologique (Roblyer & Doering, 2012). [less ▲]

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See detailThe non-restraint: a case-study into (trans)national knowledge circulation
Andersen, Eva UL

Scientific Conference (2018, November 22)

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See detailConcrete-Filled Steel Tubular (CFTS) Columns Subjected to Eccentric Compressive Load
KEDZIORA, SLAWOMIR UL; Anwaar, Muhammad Omer

in AIP Conference Proceedings (2018, November 15)

Concrete-steel composite structures are very efficient in carrying high loads as they combine benefits of both materials concrete and steel. The combination of them can significantly improve the strength ... [more ▼]

Concrete-steel composite structures are very efficient in carrying high loads as they combine benefits of both materials concrete and steel. The combination of them can significantly improve the strength of the composite structure by taking advantage of high compression resistance of concrete and high strength of steel in tension. Recently, there has been renewed interest in the composite structures used in different forms, as beams, slabs, sandwich structures and columns and many methods of structural analyses were utilised. However, none of them was able to eliminate concrete material when it fractured. The presented work concerns circular composite columns CFST under eccentric compression. The principal objective of the project was to investigate a straightforward method based on a finite element analysis employed to estimate the load carrying capacity of columns. This study has also been set out to determine whether the Drucker-Prager material model of concrete without a crack capability could be used for analyses of the CFST columns with the additional elimination of the concrete material when concrete is damaged. The elaborated finite element model was verified with existing test data from the literature. The findings show that the correlation between the test results and the numerical analysis was excellent confirming the feasibility of usage of the proposed method for the assessment of complex cases of the CFST columns. A new part of the work is the employment of a death element feature to eliminate concrete material, which theoretically is not taking any load after reaching its tensile strength. A criterion to eliminate elements from the model is the maximum principal stress greater than tensile strength. The obtained results are excellent; the established goal was met entirely. [less ▲]

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See detailMoving beyond the Lecture: Towards Collaborative Inquiry-Based Learning with Big Questions
Reuter, Bob UL; Busana, Gilbert UL

Scientific Conference (2018, November 13)

We had been teaching a first-year course on “education in the digital age” as a lecture for a few years. However, we have observed, over the last years, that (1) many students failed to pass the exam and ... [more ▼]

We had been teaching a first-year course on “education in the digital age” as a lecture for a few years. However, we have observed, over the last years, that (1) many students failed to pass the exam and (2) that a lot of them, when in their 4th year, had forgotten most of these theoretical foundations. These considerations have driven us to rethink & redesign our teaching methods and how we assess students learning outcomes. Our pedagogical approach combines various learning & teaching methods that require students to actively and collaboratively construct meaningful knowledge and share it in a community of learners using an online digital portfolio. Overall, we are quite satisfied with our teaching approach but will have to improve our formative assessment practices and will have to set up a digital portfolio solution that is more reliable and leads to greater user satisfaction. [less ▲]

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See detail(Dis)engaging in Language and Sciences Lessons: How do Primary School Students in Multilingual Luxembourg Communicate With Each Other?
Degano, Sarah UL

Scientific Conference (2018, November 09)

As the country with the highest percentage of immigration in Europe, Luxembourg has a very diverse school population. This doctoral project is part of the research project ‘CALIDIE’ that investigates how ... [more ▼]

As the country with the highest percentage of immigration in Europe, Luxembourg has a very diverse school population. This doctoral project is part of the research project ‘CALIDIE’ that investigates how multilingualism can be capitalized on. In Luxembourg, the teaching of Luxembourgish, German and French accounts for 40.5% of all curricular time. Assessment studies have shown that students of Portuguese, French and Slavic heritage underperform compared to Luxembourgish and German-speaking students in primary schools (MENJE, 2017). While studies in preschool, Year 1 and Year 2 classes show that some teachers begin to draw on children’s semiotic repertoires (Kirsch 2017), the present project targets Years 4 and 5. The focus lies on translanguaging practices. Translanguaging is the enactment of a person’s linguistic and non-linguistic resources. Research in bilingual and trilingual school contexts has shown that translanguaging can promote knowledge, understanding and academic success (García & Sylvan 2011). To help students learn, teachers need to encourage students to make use of their resources in a strategic and responsible way, whatever the status of the languages (García, Johnson & Seltzer 2017). In this paper, I examine the extent to which a fourth-grader of Slovenian language background deploys (or does not deploy) his linguistic repertoire while interacting with peers. Data are drawn from eighteen days of observation and video-recordings of the students’ language use in German, French and Science lessons from September 2017 to July 2018 in a state school in Eastern Luxembourg. The thematic analysis focuses on classroom interactions among students; the learning activities; the languages; and the purposes of their (in)flexible language use. Preliminary results show that peer interactions and child-led learning activities are scarce; the students communicate in the language of instruction; and translanguaging is used to (help) participate. The findings are tentative because data collection is on-going. [less ▲]

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See detailChildren's languaging and peer interactions in non-formal early childhood education in Luxembourg
Mortini, Simone UL

Scientific Conference (2018, November 09)

In Luxembourg children engage daily in multilingual practices outside early childhood institutions but often face monolingual practices within (Neumann, 2015). Despite research having debunked the need ... [more ▼]

In Luxembourg children engage daily in multilingual practices outside early childhood institutions but often face monolingual practices within (Neumann, 2015). Despite research having debunked the need for strict language separation for effective language learning, children are deprived from drawing on their complete linguistic repertoire (Neumann, 2015). In 2017 Luxembourg has opted for multilingual education in the early years. Formal and non-formal education settings are now required to offer the teaching of Luxembourgish, a familiarization with French and a valorisation of the children’s home languages. Whereas researchers have analysed inclusive language pedagogies (García, Johnson & Seltzer, 2017), studies seldomly examine the children’s active participation and peer interactions in early years settings implementing such multilingual pedagogies (Schwartz & Gorbatt, 2018). The present doctoral study is part of the research project MuLiPEC (Kirsch, 2016-2019) which aims at developing multilingual pedagogies through professional development in early childhood. Drawing on a sociocultural perspective, this paper focusses on two three-year-old children in two non-formal settings and investigates their languaging and interactions with peers and practitioners over a year. The data stem from 31 days of participant observation and videography of the children’s interactions with peers and practitioners and from eight interviews with the practitioners. The ongoing data analysis is based on thematic and interaction analysis. The preliminary findings, firstly, indicate that the children translanguaged, making use of their home language French, features of at least two other languages (e.g. German, English) and non-verbal communication (e.g. actions, gestures, pointing). Secondly, the children developed competences in Luxembourgish and learned new words in other languages from their peers and the practitioners. Finally, akin to Corsaro (2018), the children reproduced the practitioners’ language strategies (e.g. labelling, corrective feedback, translanguaging) during peer interactions and adapted their languaging to their interlocutors. The findings should contribute to research on dynamic multilingual practices and their impact on peer interactions in early childhood education. Corsaro, W.A. (2018). The Sociology of Childhood (5th edition). Los Angeles: SAGE García, O., Johnson, S., & Seltzer, K. (2017). The Translanguaging classroom. Leveraging student bilingualism for learning. Philadelphia: Caslon. Neumann, S. (2015). Lost in Translanguaging? Practices of Language Promotion in Luxemburgish Early Childhood Education. Global Education Review 2(1), 23–39. Schwartz, M., & Gorbatt, N. (2018). The Role of Language Experts in Novices’ Language Acquisition and Socialization. In M. Schwartz (ed.) Preschool Bilingual Education. Agency Between Children, Teachers, and Parents (pp. 343 – 356). Springer. [less ▲]

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See detailDeveloping and validating a short-form questionnaire for the assessment of seven conscientiousness facets in educational large-scale assessments
Franzen, Patrick UL; van der Westhuizen, Lindie UL; Greiff, Samuel UL et al

Scientific Conference (2018, November 09)

The influence of personality on academic outcomes has been demonstrated consistently in previous research. In particular, conscientiousness and its lower order facets generally show the strongest ... [more ▼]

The influence of personality on academic outcomes has been demonstrated consistently in previous research. In particular, conscientiousness and its lower order facets generally show the strongest predictive validity for academic success. MacCann et al. (2009) constructed a 68-item questionnaire for the comprehensive assessment of different conscientiousness facets in secondary education. However, such questionnaires are arguably too long for the use in large-scale educational assessments. Investigating the influence of conscientiousness facets within large-scale educational assessments is, nevertheless, crucial for advancing our knowledge of the differential influence of facets on various academic outcomes. Short and psychometrically sound questionnaires are thus required. Currently, no short and yet comprehensive questionnaire assessing the lower order facets of conscientiousness, that is suitable for large-scale educational assessments exists. Therefore, within the present investigation we develop a short-form instrument based upon the seven-factor version (59 items) of the questionnaire presented by MacCann et al. (2009), by using an exhaustive search algorithm and traditional item selection methods. Our sample consists of a large and representative dataset comprising all 9th grade students in Luxembourg from the Luxembourgish national school monitoring system (N = 6325; see epstan.lu), who answered French and German adaptations of the original 59-item questionnaire. We specified the exhaustive search algorithm to select the best possible combination of four items for each lower order facet, by considering goodness of fit criteria, factor saturation statistics, and measurement invariance between the German and French version. In addition, we used Mokken scale analysis and assessed the congruence of item wordings and theoretical definitions of each lower order facet to ensure content validity. We finally selected four to five items per scale based on our analyses. We found good fit statistics for all lower order facet scales (CFI >.95, RMSEA < 0.05), and acceptable to good factor saturation statistics for all but one of these scales (McDonalds ω > 0.7). On top of that, all scales show either scalar invariance, or partial scalar invariance between the German and French language version. The result of our investigation is a short and psychometrically sound instrument for the assessment of the lower order facets of conscientiousness. It is specifically tailored towards the unique context of the multilingual Luxembourgish educational system, and can be used in the upcoming Épstan cohorts. [less ▲]

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See detail'Analogue Renaissance': Strategies of Technostalgia with Kodak’s new Super 8 film camera
van der Heijden, Tim UL

Scientific Conference (2018, November 09)

“There are some moments that digital just can’t deliver, because it doesn’t have the incomparable depth and beauty of film. These moments inspired Kodak to design a new generation of film cameras.” Along ... [more ▼]

“There are some moments that digital just can’t deliver, because it doesn’t have the incomparable depth and beauty of film. These moments inspired Kodak to design a new generation of film cameras.” Along with this mission statement, Kodak announced the making of a new Super 8 film camera at the Consumer Electronics Show (CES) in January 2016. The announcement preceded the re-release of various other “retro” and “vintage” products in the following years, including Kodak’s iconic Ektachrome film stock. This paper critically investigates Kodak’s so-called “Analogue Renaissance”, the return of these analogue amateur film technologies that used to be widely popular among amateur film and home moviemakers in the 1970s. The re-releases not only fostered the imagination of numerous hobbyists around the world who were familiar with analogue filmmaking already, but also a new generation of users interested in film’s analogue aesthetic and material qualities. The paper analyses Kodak’s cross-generational attempt to remediate, revive and re-imagine the Super 8 film camera as a past media technology in particular. Drawing on the concept of “technostalgia”, the reminiscence of past media technologies in contemporary memory practices, it aims to further build on previous attempts to theorize the dynamic relations between the past and the present, the analogue and the digital, and the archival and the performative. While Kodak has been strategically framing the new Super 8 film camera under the label of the “Analogue Renaissance”, it will be shown that it not limits itself to remediating the design and analogue functionality of the device’s idiosyncratic equivalent. On the contrary, remarkably enough, the new Super 8 camera comes with several additional digital features, such as the recording of digital sound and a LCD display. The paper argues that this merging of the film camera’s original analogue features with digital ones makes Kodak’s new film camera a fundamental “hybrid” media technology, whose manufacturer’s attempt to update it to the present day by adding digital features entails more than just a way of enhancing user possibilities and experiences. While Kodak advertises its new device with a statement that aims to exaggerate the impossibilities of the digital, it will be argued that Kodak’s new Super 8 film camera requires a theoretical thinking that moves beyond the analogue-digital divide as well as previous conceptualizations of (tech)nostalgia. [less ▲]

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See detailLongitudinal development of students‘ competencies in Mathematics and German reading comprehension
Sonnleitner, Philipp UL; Krämer, Charlotte UL; Gamo, Sylvie UL et al

Scientific Conference (2018, November 09)

Im Rahmen des luxemburgischen Schulmonitorings werden Schlüsselkompetenzen der Schülerinnen und Schüler der luxemburgischen Regelschulen in regelmäßigen Abständen durch die so genannten Épreuves ... [more ▼]

Im Rahmen des luxemburgischen Schulmonitorings werden Schlüsselkompetenzen der Schülerinnen und Schüler der luxemburgischen Regelschulen in regelmäßigen Abständen durch die so genannten Épreuves Standardisées (ÉpStan) gemessen. Diese längsschnittliche Begleitung der Schülerinnen und Schüler birgt die einmalige Chance, neue Erklärungsansätze für ein (alt)bekanntes Problem des luxemburgischen Schulsystems zu finden: die großen Unterschiede der Bildungschancen von Schülerinnen und Schüler je nach Geschlecht, sprachlichem und sozioökonomischem Hintergrund. Der vorliegende Beitrag gibt nun einen ersten Einblick in die längsschnittliche Kompetenzentwicklung in den Bereichen Deutsch-Leseverstehen und Mathematik. Hierfür werden die Testergebnisse der untersuchten Schülerkohorte aus den ÉpStan-Kompetenztests 2010 in der 3.Schulstufe den Leistungen in der 9. Schulstufe im Jahre 2016 gegenübergestellt. Die Darstellung der Entwicklungsverläufe mittels Sankey-Flussdiagrammen, erlaubt ein schnelles und intuitives Verständnis, von welchem Kompetenzniveau die Schülerinnen und Schüler in der 3. Klasse starten und welches sie schließlich in der 9. Klasse erreichen. Der Effekt von nachgewiesenermaßen einflussreichen, demografischen (Hintergrund-) Merkmalen wie Geschlecht, sprachlichem Hintergrund und sozioökonomischem Status wird dabei gesondert analysiert. Beim Blick auf die generellen Entwicklungsverläufe in den Bereichen Deutsch-Leseverstehen und Mathematik fällt vor allem eine sehr hohe Stabilität der Kompetenzeinstufungen auf: Schülerinnen und Schüler der 3. Klasse, deren Leistungen auf dem (erwartungskonformen) Niveau Socle oder Niveau Avancé liegen, verfügen in der Regel auch 6 Jahre später über hohe Deutsch- bzw. Mathematikkompetenzen. Umgekehrt verbleibt die Mehrheit der Schülerinnen und Schüler mit anfänglich schwachen Leistungen auch später auf einem niedrigen Kompetenzniveau. Bezieht man nun die Teilergebnisse zum Sprachhintergrund mit ein, lässt sich ganz klar folgern, dass die Unterrichtssprache hierfür einen entscheidenden Faktor darstellt: Schülerinnen und Schüler, die Luxemburgisch oder Deutsch als Muttersprache angeben, können sowohl in Deutsch-Leseverstehen als auch in Mathematik eher ein hohes Niveau halten bzw. sich im Laufe ihrer Schulkarriere auf ein solches verbessern. Portugiesischsprachige bzw. frankophone Schülerinnen und Schüler, die im Allgemeinen ohnehin auf einem niedrigeren Kompetenzniveau starten, können sich nur teilweise deutlich verbessern, profitieren aber vom Wechsel der Unterrichtssprache im Secondaire. Die Analysen zeigen darüber hinaus, dass typische Geschlechtsunterschiede, die auf einen Vorteil für Mädchen beim Lesen und einen leichten Vorteil für Jungen in Mathematik hindeuten, schon anfangs der 3. Klasse bestehen, und über die folgenden 6 Jahre weitgehend stabil bleiben. Zusammenfassend bestätigen die Ergebnisse die bereits mehrfach aufgezeigten landestypischen Probleme, erlauben aber eine feinere Aufschlüsselung und zeitliche Verortung der Wechselwirkungen zwischen Unterrichtssprache, sprachlichem und sozioökonomischem Schülerhintergrund, und bilden so die Grundlage für effektivere Interventionen. [less ▲]

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See detailReplicating and extending the GI/E model: Social and dimensional comparison effects of achievement on test anxiety in math, physics, German, and English
Talic, Irma UL; Franzen, Patrick UL; Greiff, Samuel UL et al

Scientific Conference (2018, November 09)

The internal/external frame of reference model (I/E model; Marsh, 1986) depicts the formation of academic self-concept by assuming an interplay of social and dimensional comparison processes within and ... [more ▼]

The internal/external frame of reference model (I/E model; Marsh, 1986) depicts the formation of academic self-concept by assuming an interplay of social and dimensional comparison processes within and across different domains. Associations between achievement and self-concept are expected to be positive within one given domain due to social comparisons (i.e., external frame of reference) and negative across different domains due to dimensional comparisons (i.e., internal frame of reference). The Generalized I/E model (GI/E model; Möller, Müller-Kalthoff, Helm, Nagy, & Marsh, 2015) allows for the inclusion of other outcome variables besides academic self-concept, for example, interest or motivation. The present research aimed at applying the GI/E model to the construct of test anxiety, thereby replicating and significantly extending some first supportive findings on the validity of the GI/E model with test anxiety (Arens, Becker, & Möller, 2017). To this end, we expanded the scope of the GI/E model with test anxiety for the first time to four domains; namely math, physics, German, and English. For this purpose, we drew on a sample of N = 305 9th and 10th graders attending the highest ability school track (i.e., Gymnasium) from six different secondary schools in four German federal states. Analyses were carried out using structural equation modelling in Mplus 8. We used school grades in the respective domains as achievement indicators. Test anxiety was assessed separately for each domain while simultaneously differentiating between two components of test anxiety; namely, worry and emotionality. Our results suggested negative within-domain relations between achievement and test anxiety in all four domains (i.e., higher grades were associated with less test anxiety). The pattern of results for the relations across domains was not as clear. Positive links between achievement and test anxiety across domains (i.e., higher grades in domain A were associated with higher test anxiety in domain B) were weak and could only be established for the association between German achievement and students’ worry in mathematics. These findings partially supported the assumptions made by the GI/E model. As such, we replicated preexisting findings and added novel insights to the GI/E model. Our results were discussed within the framework of self-concept theory and research as well as dimensional comparison theory. [less ▲]

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See detailDimensional and Social Comparisons Effects on Domain-Specific Self-Concepts and Interests: A Study of Elementary School Children from Luxembourg Across Two Waves
van der Westhuizen, Lindie UL; Talic, Irma UL; Greiff, Samuel UL et al

Scientific Conference (2018, November 09)

Already at the beginning of elementary school, students start to develop self-beliefs and attitudes that reflect their motivation, thoughts, and feelings about a specific school domain. The internal ... [more ▼]

Already at the beginning of elementary school, students start to develop self-beliefs and attitudes that reflect their motivation, thoughts, and feelings about a specific school domain. The internal/external frame of reference (I/E) model (Marsh, 1986) encapsulates this phenomenon by explicating the formation of academic self-concept through a combination of social (i.e. comparing one’s achievement in one domain with the achievement of one’s peers in the same domain) and dimensional (i.e. comparing one’s achievement in one domain with one’s achievement in another domain) comparison processes. The recently established generalized internal/external frame of reference (GI/E) model (Möller, Müller-Kalthoff, Helm, Nagy, & Marsh, 2015) builds on the I/E model by extending it to the formation of other subject-specific academic self-beliefs and attitudes, such as interest and test anxiety. Despite the salience of the (G)I/E model in educational research, studies investigating the formation of self-beliefs and attitudes according to this model remains scarce among elementary school children. This study aims to contribute to the current literature by examining the associations between verbal and mathematics achievement, on the one hand, and corresponding domain-specific self-concepts and interests, on the other hand. A population of Luxembourgish elementary school students was assessed twice, two years apart (once in Grade 1 and once in Grade 3) as part of the Luxembourgish school monitoring system (EpStan, cohorts 2014 & 2016; epstan.lu). Using a domain-specific approach, students were assessed on math and verbal achievement as well as German- and math self-concept and interest. This culminated in a sample of N = 3606 elementary school children who participated in both waves. German- and math self-concepts and interests were self-reported whereas standardized achievement tests (see epstan.lu) were used as indicators of math and verbal (Luxembourgish for Grade 1 and German for Grade 3) achievement. Cross-lagged structural equation modelling was performed in Mplus 8 using WLSMV estimation for categorical variables. Overall, the results suggest strong support for the (G)I/E model for Grade 3, while only partial support was found for the (G)I/E model for Grade 1. More specifically, for both Grade 1 and Grade 3, achievement was positively related to self-concept and interest within the same domain. Negative relations between achievement and self-concept and interest across domains were found in Grade 3, but not in Grade 1. The findings are discussed within the context of theory and research on self-concept differentiation processes, dimensional comparison theory, and the multilingual Luxembourgish educational system. [less ▲]

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See detailResearching education in Luxembourg (symposium)
Fischbach, Antoine UL

Scientific Conference (2018, November 08)

Detailed reference viewed: 19 (2 UL)
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See detailChildren’s languaging and peer interactions in non-formal early childhood education in Luxembourg
Kirsch, Claudine UL; Aleksic, Gabrijela UL; Andersen, Katja Natalie UL

Scientific Conference (2018, November 08)

The need for multilingual pedagogies has been recognized and several multilingual programmes have been implemented in early childhood in Europe. In Luxembourg, where this study is based, laws were voted ... [more ▼]

The need for multilingual pedagogies has been recognized and several multilingual programmes have been implemented in early childhood in Europe. In Luxembourg, where this study is based, laws were voted in 2017 that require early years practitioners to develop Luxembourgish, familiarize children with French, and value home languages. To develop inclusive multilingual practices, the authors of this presentation developed a 30-hour professional development programme (thereafter PD) which was long-term, collaborative, inquiry-based, performance-oriented, and included coaching. The participants carried out and video-record activities based on books and rhymes in several languages, reflected on these, and received feedback. This case-study examines the influence of the PD on the understanding of language learning and practices of two teachers and five carers working in schools and crèches. The data stem from a questionnaire completed three times; twelve interviews; six observations of the training; 30 video-recorded activities; ten coaching reports, and emails. The methods of data analysis comprise paired samples t-test, correlational analysis, content analysis and triangulation. The findings show a positive effect of the PD on understanding of language learning and practices. The teachers and some carers developed a better understanding of social constructivist learning theories which influenced their practices that began to focus on interactions between adults and children, and amongst children. The other carers understood the relevance of dialogue and carried out activities in several languages but their overall practice did not change. The findings confirm that collaborative, inquiry-based PD can be transformative (Gaikhorst et al., 2017; Prenger et al., 2017) and change perspectives and practices to some extent (Buschmann & Sachse, 2018). In addition, they add to the dearth of literature on PD on multilingual education in early years (Egert, 2015). Buschmann, A., & Sachse, S. (2018). Heidelberg interaction training for language promotion in early childhood settings. European Journal of Education, 53(1), 66-78. Egert, F. (2015). Meta-analysis on the impact of in-service professional development programs for preschool teachers on quality ratings and child outcomes. Gaikhorst, L., Beishuizen, J. J. J., Zijlstra, B. J. H., & Volman, M. L. L. (2017) The sustainability of a teacher professional development programme for beginning urban teachers, Cambridge Journal of Education, 47(1), 135-154. Prenger, R., Poortman, C. L., & Handelzalts, A. (2017). Factors influencing teachers’ professional development in networked professional learning communities. Teaching and Teacher Education, 68(1), 77-90. [less ▲]

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See detailCognitive Potential and Academic Success in Luxembourg: Use case of the "Test of Cognitive Potential"
Muller, Claire UL; Reichel, Yanica UL; Wollschläger, Rachel UL et al

Poster (2018, November 08)

The “Test of Cognitive Ability” (“TCP”) is a language-free test of reasoning ability that was created at the heart of the Luxembourg Centre for Educational Testing (LUCET). The TCP was initially developed ... [more ▼]

The “Test of Cognitive Ability” (“TCP”) is a language-free test of reasoning ability that was created at the heart of the Luxembourg Centre for Educational Testing (LUCET). The TCP was initially developed for children at the age of 10 and can be applied in a group context. Since no advanced language-skills are required in order to take this test, it is perfectly suited not only to serve as a cognitive ability screener in a multi-lingual context, but also to study the relationship of cognitive ability and academic success within a demanding school-system that deals with a very complex mixture of student backgrounds (spoken languages, socioeconomic status, culture, etc.). Using traditional intelligence tests with language-based tasks and instructions could, in this context, result in biased data since maximum performance relies on a good understanding of task requirements. Being language-free, the TCP can help in gaining a more precise understanding of academic performance under different circumstances and prevent wrong conclusions as to the fairness of curricular requirements for different student populations. The present contribution will present the Test of Cognitive Potential and give an overview of how the relationship of cognitive ability and academic success varied within different subpopulations of a Luxembourgish sample of 303 4th graders. [less ▲]

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See detailExemplarische Bildungsverläufe von Jugendlichen in den Erziehungshilfen und im Übergang
Göbel, Sabrina UL

Scientific Conference (2018, November 08)

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See detailSchulische Kompetenzen von Erstklässlern und ihre Entwicklung nach zwei Jahren.
Hoffmann, Danielle UL; Hornung, Caroline; Gamo, Sylvie UL et al

Poster (2018, November 08)

Jedes Jahr werden in den luxemburgischen Schulen die ÉpStan (Épreuves Standardisées) durchgeführt. Hierbei handelt es sich um nationale Schulleistungstests, welche Kompetenzen im Bereich der Mathematik ... [more ▼]

Jedes Jahr werden in den luxemburgischen Schulen die ÉpStan (Épreuves Standardisées) durchgeführt. Hierbei handelt es sich um nationale Schulleistungstests, welche Kompetenzen im Bereich der Mathematik und den Schulsprachen (Luxemburgisch, Deutsch und Französisch) auf standardisierte Art messen. Der vorliegende Beitrag ist sowohl eine Bestandsaufnahme der Schülerschaft zu Beginn des formalen Bildungswegs als auch ein Bericht ihrer Evolution über zwei Jahre im luxemburgischen Schulsystem. Hierzu haben wir die Daten aus drei Erhebungen (2014, 2015, 2016) der ÉpStan analysiert. Zum einen zeigen wir, anhand von Daten aus drei verschiedenen Kohorten, welche schulischen Kompetenzen Erstklässler (Zyklus 2.1) am Anfang ihrer Schullaufbahn aufweisen. Zudem hatten wir die Möglichkeit die Schüler und Schülerinnen der ersten Erhebung (2014) zwei Jahre später im Zyklus 3.1 nochmals zu testen und somit ihren Entwicklungsverlauf über zwei Jahre im luxemburgischen Bildungssystem zu dokumentieren. Diese ersten längsschnittlichen Daten zeigen, dass die Mehrheit der Schülerinnen und Schüler zu Beginn des Zyklus 2.1 das Niveau Avancé in den drei überprüften Kernkompetenzen („Luxemburgisch-Hörverstehen“, „Vorläuferfertigkeiten der Schriftsprache“ und „Mathematik“) erreicht. Somit stellen wir fest, dass die für den ersten Lernzyklus festgehaltenen Bildungsstandards erfüllt sind. Zwei Jahre später fällt die Verteilung der Schülerinnen und Schüler auf die verschiedenen Kompetenzränge negativer aus als im Zyklus 2.1. Im Zyklus 3.1 haben vergleichsweise mehr Kinder das Niveau Socle in allen drei Kernkompetenzen („Deutsch-Hörverstehen“, „Deutsch-Leseverstehen“ und „Mathematik“) noch nicht erreicht. Unsere Befunde zeigen außerdem, dass verschiedene außerschulische Faktoren (wie z. B. sozioökonomische Situation, Sprachhintergrund) bereits sehr früh im Verlauf der Schullaufbahn einen äußerst starken Einfluss auf die Testergebnisse haben und sich dieser Einfluss über die Jahre hinweg verstärkt. Abschließend präsentieren und diskutieren wir verschiedene Erklärungsansätze für diesen beobachteten Schereneffekt. [less ▲]

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See detailFAST: A MapReduce Consensus for High Performance Blockchains
Khan, Nida UL

in ACM BlockSys '18 Proceedings of the 1st Workshop on Blockchain-enabled Networked Sensor Systems (2018, November 04)

Blockchain platforms when used as a database for IoT systems can resolve data reliability fault-tolerance, consistency and non-repudiation issues. However, their inherent shortcomings related to their ... [more ▼]

Blockchain platforms when used as a database for IoT systems can resolve data reliability fault-tolerance, consistency and non-repudiation issues. However, their inherent shortcomings related to their throughput in terms of processed transactions, limit their applicability in such environments in a decentralized way as the underlying network is unable to sustain high workloads. In this paper a fully decentralized high performance consensus mechanism, named FAST, is proposed for a public blockchain. FAST is based on mapreduce paradigm for aggregating and adding transactions on blockchain blocks. FAST was implemented and evaluated in a basic blockchain prototype. A light client for FAST using IPFS, was developed to bring about a reduction in the data stored locally. The obtained results from tests conducted on the prototype depict that FAST exceeds the performance of not just other existing blockchain platforms but comes very close to the throughput of traditional electronic payment networks such as Visa. [less ▲]

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See detailEmpowering reuse of digital cultural heritage in context-aware crosscuts of European history
Antoniou, A; Lopez-Nores, M; Yannick, N et al

in Wallace, M; Antoniou, A (Eds.) Proceedings of the Workshop on Cultural Informatics co-located with the EUROMED International Conference on Digital Heritage 2018 (EUROMED 2018) (2018, November 03)

The paper presents the H2020 CrossCult project, providing a short overview, a summary of the platform developed by the project, a description of the consortium, lessons learnt in three main dimensions ... [more ▼]

The paper presents the H2020 CrossCult project, providing a short overview, a summary of the platform developed by the project, a description of the consortium, lessons learnt in three main dimensions (humanities, technology and business), the open challenges and the main tools developed by the project. [less ▲]

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See detailIt's not only the game, it's also the player: The role of player personality in violent video game preference
Holl, Elisabeth UL; Melzer, André UL

Scientific Conference (2018, November 03)

In contrast to the effects of game content, violent video games have less been researched with regard to players' preferences for these games, and whether these preferences are related to certain ... [more ▼]

In contrast to the effects of game content, violent video games have less been researched with regard to players' preferences for these games, and whether these preferences are related to certain personality characteristics. Using a novel brief and uni-dimensional self-report measure, the present research examined the role of personality factors and preferences for violent video games. A scale of five items was administrated in two studies that involved 292 and 180 respondents, respectively. The same scale with two additional items was presented to 190 respondents in the third study, which included measures revealed by prior research to be relevant for understanding violent video game motivation and preference. More specifically, we measured participants' trait aggression, the Dark Triad traits of psychopathy, Machiavellianism, and narcissism. To test for the scale's discriminant validity, trait empathy was also included. In line with other findings in the literature (e.g., Greitemeyer, 2015), results obtained with the self-report measure indicated that players with a propensity for games featuring violent themes show callous, impulsive and exploitative attributes, whereas narcissism was not a significant predictor. However, and as already suggested by some authors (Hartmann, Möller, & Krause, 2014), a lack of empathy was found to predict violent game preferences. The present findings are important with regard to future research on video games that should focus more on the players and their gaming motivation than on the effects of playing alone. [less ▲]

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See detailVisualizing the Learning Progress of Self-Driving Cars
Mund, Sandro; Frank, Raphaël UL; Varisteas, Georgios UL et al

in 21st International Conference on Intelligent Transportation Systems (2018, November 02)

Using Deep Learning to predict lateral and longitudinal vehicle control, i.e. steering, acceleration and braking, is becoming increasingly popular. However, it remains widely unknown why those models ... [more ▼]

Using Deep Learning to predict lateral and longitudinal vehicle control, i.e. steering, acceleration and braking, is becoming increasingly popular. However, it remains widely unknown why those models perform so well. In order for them to become a commercially viable solution, it first needs to be understood why a certain behavior is triggered and how and what those networks learn from human-generated driving data to ensure safety. One research direction is to visualize what the network sees by highlighting regions of an image that influence the outcome of the model. In this vein, we propose a generic visualization method using Attention Heatmaps (AHs) to highlight what a given Convolutional Neural Network (CNN) learns over time. To do so, we rely on a novel occlusion technique to mask different regions of an input image to observe the effect on a predicted steering signal. We then gradually increase the amount of training data and study the effect on the resulting Attention Heatmaps, both in terms of visual focus and temporal behavior. [less ▲]

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See detailRevisiting Deniability in Quantum Key Exchange via Covert Communication and Entanglement Distillation
Atashpendar, Arash UL; Policharla, Guru Vamsi; Roenne, Peter UL et al

in Secure IT Systems, 23rd Nordic Conference, NordSec 2018. Lecture Notes in Computer Science, vol 11252. Springer, Cham (2018, November 02)

We revisit the notion of deniability in quantum key exchange (QKE), a topic that remains largely unexplored. In the only work on this subject by Donald Beaver, it is argued that QKE is not necessarily ... [more ▼]

We revisit the notion of deniability in quantum key exchange (QKE), a topic that remains largely unexplored. In the only work on this subject by Donald Beaver, it is argued that QKE is not necessarily deniable due to an eavesdropping attack that limits key equivocation. We provide more insight into the nature of this attack and how it extends to other constructions such as QKE obtained from uncloneable encryption. We then adopt the framework for quantum authenticated key exchange, developed by Mosca et al., and extend it to introduce the notion of coercer-deniable QKE, formalized in terms of the indistinguishability of real and fake coercer views. Next, we apply results from a recent work by Arrazola and Scarani on covert quantum communication to establish a connection between covert QKE and deniability. We propose DC-QKE, a simple deniable covert QKE protocol, and prove its deniability via a reduction to the security of covert QKE. Finally, we consider how entanglement distillation can be used to enable information-theoretically deniable protocols for QKE and tasks beyond key exchange. [less ▲]

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See detailA survey: The usage of Augmented Reality in Industry
Gallala, Abir UL; Hichri, Bassem UL; Plapper, Peter UL

in Robotix-Academy Conference for Industrial Robotics 2018 (2018, November 01)

Human-Robot-Interaction technologies in industry 4.0 and modern manufacturing are more and more growing. Using off-line robot programming methods such as Augmented Reality (AR) could gain time and money ... [more ▼]

Human-Robot-Interaction technologies in industry 4.0 and modern manufacturing are more and more growing. Using off-line robot programming methods such as Augmented Reality (AR) could gain time and money as well as improve programming and repair tasks. This paper is a study of the use of AR in smart factories. [less ▲]

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See detailReflecting on teachers' practices as multimodally co-constructed in spatial reality
Arend, Béatrice UL

in Proceedings of ICERI2018 (2018, November)

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See detailAußerschulisches Lesen und Lesekompetenz Zum Zusammenhang zwischen den Deutsch- und Französisch- Lesekompetenzen von Neuntklässlerinnen und Neuntklässlern und ihren außerschulischen Lesegewohnheiten in Luxemburg.
Reichert, Monique UL; Krämer, Charlotte UL; Rivas, Salvador UL et al

Scientific Conference (2018, November)

In Luxemburg erreichen viele Jugendliche ein gutes Lesekompetenzniveau nicht nur in einer, sondern gleich in zwei Sprachen. Allerdings wird wiederholt darauf hingewiesen, dass die Lesekompetenzen in ... [more ▼]

In Luxemburg erreichen viele Jugendliche ein gutes Lesekompetenzniveau nicht nur in einer, sondern gleich in zwei Sprachen. Allerdings wird wiederholt darauf hingewiesen, dass die Lesekompetenzen in Luxemburg stark mit dem familiären Hintergrund der Schülerinnen und Schüler zusammenhängen. Die vorliegende Studie soll jedoch über die Darstellung der Zusammenhänge zwischen den Deutsch- und Französisch-Lesekompetenzen und Einflussfaktoren wie sozio-ökonomischem Hintergrund, Migrationsstatus und Muttersprache hinausgehen. In der Tat stellt sich die Frage, ob es Faktoren gibt, die sich positiv auf das Lesekompetenzniveau der Schülerinnen und Schüler auswirken und auf die sie – anders als bei diesen mittlerweile gut belegten Faktoren – selbst Einfluss nehmen können? Das Leseverhalten Jugendlicher stellt hierfür einen naheliegenden Ansatzpunkt dar. Somit wurden die Schülerinnen und Schüler während der ÉpStan 2016 nicht nur zu ihrem familiären, schulischen und persönlichen Hintergrund befragt, sondern erstmals auch zu ihrem außerschulischen Leseverhalten. Hierbei wurde erfasst, wie häufig sie in ihrer Freizeit Texte unterschiedlicher Art (z. B. Erzählungen, Sachtexte, Zeitungsartikel, Foreneinträge oder Emails) lesen, und in welchen Sprachen sie dies tun. Mittels verschiedener Regressionsanalysen wurde der familiäre Hintergrund der Jugendlichen, ihr Leseverhalten, sowie ihr Lesekompetenzniveau im Deutschen und Französischen zueinander in Bezug gesetzt. Die aus diesen Analysen hervorgehenden Ergebnisse belegen eindrücklich, dass neben dem familiären Hintergrund auch die Lesehäufigkeit und die Sprache, in der die Schülerinnen und Schüler üblicherweise lesen, von Bedeutung für das erreichte Lesekompetenzniveau sind. Darüber hinaus haben insbesondere die Textsorten, mit denen sich die Jugendlichen in ihrer Freizeit auseinandersetzen, entscheidenden Einfluss auf ihre Deutsch- und ihre Französisch-Lesekompetenz. Insbesondere die Häufigkeit, mit der Jugendliche angeben, narrative Texte (wie Geschichten, Romane oder Erzählungen) zu lesen, steht deutlich in positivem Zusammenhang mit ihrer Lesekompetenz in beiden Sprachen. Der Vortrag schließt mit einer Diskussion bezüglich der außerordentlich hohen Attraktivität von digitalen Textsorten bei Kindern und Jugendlichen, und den Möglichkeiten, diese Vielfalt an primär kommunikativ bzw. interaktiv ausgerichteten Lesematerialien als lebensnahe, pädagogische „Sprungbretter“ zu nutzen, mit deren Hilfe zukünftige Leserinnen und Leser an zunehmend komplexere Texte herangeführt werden könnten. [less ▲]

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See detailSystems ecology of the human microbiome
Wilmes, Paul UL

Scientific Conference (2018, November)

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See detailCognitive functioning and decline in relation to urban environmental characteristics
Leist, Anja UL

Scientific Conference (2018, November)

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See detailIndustry 4.0 – Implementation of an automated assembly line in a wooden modular house production plant: The case Leko Labs
de Vincenzo, Vincenzo UL; Hichri, Bassem UL; Plapper, Peter UL

in De vincenzo, Vincenzo; Hichri, Bassem; Plapper, Peter (Eds.) Robotix-Academy Conference for Industrial Robotics (RACIR) 2018 (2018, November)

Detailed reference viewed: 19 (0 UL)