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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 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 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 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 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 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 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 detailA New Perspective on the Luxembourgish Genitive
Döhmer, Caroline UL

in Germanic Genitives (in press)

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See detailAn Investigation of Compression Techniques to Speed up Mutation Testing
Zhu; Panichella, Annibale UL; Zaidman, Andy

in Proceedings of 11th IEEE Conference on Software Testing, Validation and Verification, 2018 (in press)

Mutation testing is widely considered as a high-end test coverage criterion due to the vast number of mutants it generates. Although many efforts have been made to reduce the computational cost of ... [more ▼]

Mutation testing is widely considered as a high-end test coverage criterion due to the vast number of mutants it generates. Although many efforts have been made to reduce the computational cost of mutation testing, in practice, the scalability issue remains. In this paper, we explore whether we can use compression techniques to improve the efficiency of strong mutation based on weak mutation information. Our investigation is centred around six mutation compression strategies that we have devised. More specifically, we adopt overlapped grouping and Formal Concept Analysis (FCA) to cluster mutants and test cases based on the reachability (code covergae) and necessity (weak mutation) conditions. Moreover, we leverage mutation knowledge (mutation locations and mutation operator types) during compression. To evaluate our method, we conducted a study on 20 open source Java projects using manually written tests. We also compare our method with pure random sampling and weak mutation. The overall results show that mutant compression techniques are a better choice than random sampling and weak mutation in practice: they can effectively speed up strong mutation 6.3 to 94.3 times with an accuracy of >90%. [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 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 detailLe récit de voyage comme rupture de contrat
Roelens, Nathalie UL

in Acta Fabula : Revue des Parutions en Théorie Littéraire (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 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 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 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 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 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 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 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 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 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 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 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 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'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 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 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 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 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 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 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 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 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 detailResearching education in Luxembourg (symposium)
Fischbach, Antoine UL

Scientific Conference (2018, November 08)

Detailed reference viewed: 16 (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 detailFAST: A MapReduce Consensus for High Performance Blockchains
Khan, Nida UL

in Khan, Nida (Ed.) 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 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 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 (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 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 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 detailOptimal dispatching of electric and hybrid buses subject to scheduling and charging constraints
Rinaldi, Marco UL; Parisi, Federico; Laskaris, Georgios UL et al

Scientific Conference (2018, November)

We consider the problem of optimally determining the sequence of electric and hybrid buses departing from a multi-line bus terminal, considering both service constraints (schedule adherence) and energy ... [more ▼]

We consider the problem of optimally determining the sequence of electric and hybrid buses departing from a multi-line bus terminal, considering both service constraints (schedule adherence) and energy constraints (electric bus charging status, bus recharging scheduling in capacitated facilities). The problem is formulated as a Mixed Integer Linear Program, with the objective of minimizing the total operational cost for the bus lines in question. System dynamics are captured by practical sets of constraints, ranging from scheduling adherence to discharge- recharge dynamics. Individual operational costs at the bus level and at the trip level are fully parametrized, allowing for extensive sensitivity analysis. We investigate a real-life case study based on the city of Luxembourg, where two charging stations have been installed in the central station’s bus terminal. Experimental results show that, while full electrification is indeed possible, the required fleet size depends strongly on the given line(s) timetable. [less ▲]

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See detailDeformation-Based Abnormal Motion Detection using 3D Skeletons
Baptista, Renato UL; Demisse, Girum UL; Aouada, Djamila UL et al

in IEEE International Conference on Image Processing Theory, Tools and Applications (IPTA) (2018, November)

In this paper, we propose a system for abnormal motion detection using 3D skeleton information, where the abnormal motion is not known a priori. To that end, we present a curve-based representation of a ... [more ▼]

In this paper, we propose a system for abnormal motion detection using 3D skeleton information, where the abnormal motion is not known a priori. To that end, we present a curve-based representation of a sequence, based on few joints of a 3D skeleton, and a deformation-based distance function. We further introduce a time-variation model that is specifically designed for assessing the quality of a motion; we refer to a distance function that is based on such a model as~\emph{motion quality distance}. The overall advantages of the proposed approach are 1) lower dimensional yet representative sequence representation and 2) a distance function that emphasizes time variation, the motion quality distance, which is a particularly important property for quality assessment. We validate our approach using a publicly available dataset, SPHERE-StairCase2014 dataset. Qualitative and quantitative results show promising performance. [less ▲]

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See detailDeterminants of cognitive decline in a large cross-national study using machine learning
Leist, Anja UL

in Innovation in Aging (2018, November), 2(S1), 244

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See detailAdvancing the Security of Trustworthy Self-IoT (Position Paper)
Msadek, Mohamed Nizar UL; Soua, Ridha UL; Ladid, Latif UL et al

in International Conference on Smart Applications, Communications and Networking (SmartNets) (2018, November)

The Internet of Things (IoT) encompasses many aspects of our daily life, from connected homes and cities through connected vehicles and roads to devices that collaborate independently to achieve a ... [more ▼]

The Internet of Things (IoT) encompasses many aspects of our daily life, from connected homes and cities through connected vehicles and roads to devices that collaborate independently to achieve a specific purpose. Being an example of a largescale self-organizing systems, the IoT should present imperative properties such as autonomy and trustworthiness. However, compared to classical self-organizing systems, IoT has intrinsic characteristics (wide deployment, resource constraints, uncertain environment, etc.) that open up several security challenges. These challenges cannot be solved by existing Autonomic and Organic Computing techniques and therefore new techniques adapted to self-organizing IoT, (that we call Self-IoT) peculiarities are needed. To this end, this paper studies related work in the area of self-organizing IoT, identifies and describes the key research challenges for trustworthy secure Self-IoT and proposes new and tailored existing solutions. [less ▲]

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See detailAre octroyed constitutions of the 19th century to be considered as 'imposed constitutions'?
Gerkrath, Jörg UL

in Contiades, Xenophon; Albert, Richard; Fotiadou, Alkmene (Eds.) The Law and Legitimacy of Imposed Constitutions (2018, November)

The paper considers ‘octroyed’, ‘conceded’ or ‘granted’ constitutions of 19th century Europe whose common roots are to be found in the French ‘Charte constitutionnelle’ of 1814. These Charters stem from a ... [more ▼]

The paper considers ‘octroyed’, ‘conceded’ or ‘granted’ constitutions of 19th century Europe whose common roots are to be found in the French ‘Charte constitutionnelle’ of 1814. These Charters stem from a paternalistic process of domestic constitution-making engaged unilaterally by a monarch possessing the de facto constituent power and exercising it without the direct involvement of a body representing the people. Such octroyed constitutions, which are of course to be opposed to democratically established ones, show nevertheless a number of specific characteristics which distinguish them also from ‘imposed constitutions’ in the usual sense. The expression ‘constitutional octroy’ should not be used as a synonym for any process leading to an ‘imposed Constitution’. The contribution aims to develop and to validate or invalidate the value of a series of distinctive criteria and possible elements of a definition of ‘octroyed’ or ‘granted’ constitutions in order to underline their specificity. [less ▲]

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See detailAssociations of wealth with frailty and memory impairment across the course of aging
Leist, Anja UL

in Innovation in Aging (2018, November), 2(S1), 906

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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 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 detailAttacks and Countermeasures for White-box Designs
Biryukov, Alex UL; Udovenko, Aleksei UL

in Peyrin, Thomas; Galbraith, Steven (Eds.) Advances in Cryptology – ASIACRYPT 2018 (2018, November)

In traditional symmetric cryptography, the adversary has access only to the inputs and outputs of a cryptographic primitive. In the white-box model the adversary is given full access to the implementation ... [more ▼]

In traditional symmetric cryptography, the adversary has access only to the inputs and outputs of a cryptographic primitive. In the white-box model the adversary is given full access to the implementation. He can use both static and dynamic analysis as well as fault analysis in order to break the cryptosystem, e.g. to extract the embedded secret key. Implementations secure in such model have many applications in industry. However, creating such implementations turns out to be a very challenging if not an impossible task. Recently, Bos et al. proposed a generic attack on white-box primitives called differential computation analysis (DCA). This attack was applied to many white-box implementations both from academia and industry. The attack comes from the area of side-channel analysis and the most common method protecting against such attacks is masking, which in turn is a form of secret sharing. In this paper we present multiple generic attacks against masked white-box implementations. We use the term “masking” in a very broad sense. As a result, we deduce new constraints that any secure white-box implementation must satisfy. Based on the new constraints, we develop a general method for protecting white-box implementations. We split the protection into two independent components: value hiding and structure hiding. Value hiding must pro- vide protection against passive DCA-style attacks that rely on analysis of computation traces. Structure hiding must provide protection against circuit analysis attacks. In this paper we focus on developing the value hiding component. It includes protection against the DCA attack by Bos et al. and protection against a new attack called algebraic attack. We present a provably secure first-order protection against the new al- gebraic attack. The protection is based on small gadgets implementing secure masked XOR and AND operations. Furthermore, we give a proof of compositional security allowing to freely combine secure gadgets. We derive concrete security bounds for circuits built using our construction. [less ▲]

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See detailWie wirken sich Klassenwiederholungen in der Sekundarstufe 1 auf spätere Schulnoten aus? Eine Längsschnittanalyse
Klapproth, Florian; Fischbach, Antoine UL; Keller, Ulrich UL et al

Scientific Conference (2018, November)

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See detailAn Approach to Incorporate Emotions in a Chatbot with Seq2Seq Model
Zheng, Yaqiong; Guo, Siwen UL; Schommer, Christoph UL

in Benelux Conference on Artificial Intelligence, ‘s-Hertogenbosch 8-9 November 2018 (2018, November)

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See detailPolicy and research priorities of the World Young Leaders in Dementia (WYLD) network
Leist, Anja UL

Scientific Conference (2018, October 30)

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See detailMicromagnetic simulations for understanding magnetic SANS
Michels, Andreas UL

Scientific Conference (2018, October 29)

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See detailPrésences de souverains dans l'espace du "regnum Lotharii": Itinéraires, lieux de pouvoir et fidélités "Lotharingiennes" (869-936)
Pettiau, Hérold UL

in Pettiau, Hérold; Margue, Michel (Eds.) La Lotharingie en question. Identités, oppositions, intégration. LOtharingische Identitäten im Spannungsfeld zwischen integrativen und partikularen Kräften. Actes des 14es Journées Lotharingiennes (2018, October 25)

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See detailForward Secrecy for SPAKE2
Lopez Becerra, José Miguel UL; Ostrev, Dimiter UL; Skrobot, Marjan

in Baek, Joonsang; Willy, Susilo (Eds.) Provable Security (2018, October 25)

Currently, the Simple Password-Based Encrypted Key Exchange (SPAKE2) protocol of Abdalla and Pointcheval (CT-RSA 2005) is being considered by the IETF for standardization and integration in TLS 1.3 ... [more ▼]

Currently, the Simple Password-Based Encrypted Key Exchange (SPAKE2) protocol of Abdalla and Pointcheval (CT-RSA 2005) is being considered by the IETF for standardization and integration in TLS 1.3. Although it has been proven secure in the Find-then-Guess model of Bellare, Pointcheval and Rogaway (EUROCRYPT 2000), whether it satisfies some notion of forward secrecy remains an open question. In this work, we prove that the SPAKE2 protocol satisfies the so-called weak forward secrecy introduced by Krawczyk (CRYPTO 2005). Furthermore, we demonstrate that the incorporation of key-confirmation codes in SPAKE2 results in a protocol that provably satisfies the stronger notion of perfect forward secrecy. As forward secrecy is an explicit requirement for cipher suites supported in the TLS handshake, we believe this work could fill the gap in the literature and facilitate the adoption of SPAKE2 in the recently approved TLS 1.3. [less ▲]

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See detailDoing Digital Hermeneutics in an Interdisciplinary Setting
van der Heijden, Tim UL

Scientific Conference (2018, October 25)

This contribution examines the conference theme from the perspective of the Doctoral Training Unit (DTU) in ‘Digital History and Hermeneutics’, a four-year interdisciplinary research and training program ... [more ▼]

This contribution examines the conference theme from the perspective of the Doctoral Training Unit (DTU) in ‘Digital History and Hermeneutics’, a four-year interdisciplinary research and training program funded by the Luxembourg National Research Fund (FNR) and hosted by the Centre for Contemporary and Digital History (C2DH) at the University of Luxembourg. The DTU is designed as an experimental platform for collaboration, in which thirteen doctoral candidates with different disciplinary backgrounds – from history, linguistics and philosophy to computer and information science – study and reflect on the epistemological and methodological implications of the ‘digital turn’ on historical research. The presentation takes a look back at the project’s first year, in which the doctoral candidates were introduced to various skills and methods in digital humanities, including text mining, digital source criticism, database structures, data visualization, GIS analysis, tool criticism and algorithmic critique. Based on experiences by the doctoral students themselves as reflected in semi-structured interviews, as well as drawing upon studies in interdisciplinarity, digital humanities, and the role of space(s) in scientific collaborations, the possibilities and challenges will be explored of doing digital history and hermeneutics in an interdisciplinary setting. [less ▲]

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See detailTwitter data as primary sources for historians: a critical approach
Clavert, Frédéric UL; Papastamkou, Sofia

Scientific Conference (2018, October 25)

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See detailThe long and winding road to inclusion in Higher Education
Limbach-Reich, Arthur UL

Scientific Conference (2018, October 18)

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See detailEin Atlas der Stadtgeschichte Luxemburgs - digital und interaktiv. Ein Werkstattbericht
Uhrmacher, Martin UL; Kass, Steve UL

Scientific Conference (2018, October 18)

Seit 2016 widmet sich ein Forschungsprojekt der Universität, in Zusammenarbeit mit der Stadt Luxemburg, der Erstellung eines historischen Atlas. Dieser wird die städtische Entwicklung seit Beginn des 19 ... [more ▼]

Seit 2016 widmet sich ein Forschungsprojekt der Universität, in Zusammenarbeit mit der Stadt Luxemburg, der Erstellung eines historischen Atlas. Dieser wird die städtische Entwicklung seit Beginn des 19. Jahrhunderts in Form von digitalen und interaktiven Karten im Internet darstellen. Fünf Zeitschnitte sind vorgesehen, um die tiefgreifenden Wandlungsprozesse Luxemburgs zu analysieren und zugleich auch spannend und anschaulich zu präsentieren: Von der Festungsstadt, die das militärische Korsett erst nach 1867 ablegen konnte, über eine moderne europäischen Hauptstadt des frühen 20. Jahrhunderts bis hin zu einem der Hauptverwaltungssitze der EU und einem internationalen Finanzzentrum. Ein Jahr vor der offiziellen Veröffentlichung des Atlas werden erste Ergebnisse präsentiert. Dies ermöglicht einen Einblick in die historische Forschungsarbeit sowie in die digitale Aufbereitung alter Karten für die Publikation im Internet. [less ▲]

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See detailDEMO: An Effective Android Code Coverage Tool
Pilgun, Aleksandr UL; Gadyatskaya, Olga UL; Dashevskyi, Stanislav UL et al

Poster (2018, October 15)

The deluge of Android apps from third-party developers calls for sophisticated security testing and analysis techniques to inspect suspicious apps without accessing their source code. Code coverage is an ... [more ▼]

The deluge of Android apps from third-party developers calls for sophisticated security testing and analysis techniques to inspect suspicious apps without accessing their source code. Code coverage is an important metric used in these techniques to evaluate their effectiveness, and even as a fitness function to help achieving better results in evolutionary and fuzzy approaches. Yet, so far there are no reliable tools for measuring fine-grained bytecode coverage of Android apps. In this work we present ACVTool that instruments Android apps and measures the smali code coverage at the level of classes, methods, and instructions. Tool repository: https://github.com/pilgun/acvtool [less ▲]

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See detailSoLeMiO: Semantic Integration of Learning Material in Office
Grevisse, Christian UL; Manrique, Rubén; Mariño, Olga et al

in Proceedings of E-Learn: World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education 2018 (2018, October 15)

Learners throughout different educational levels and study domains use a significant amount of time to consult learning material. In addition to the resources given by their teachers, further information ... [more ▼]

Learners throughout different educational levels and study domains use a significant amount of time to consult learning material. In addition to the resources given by their teachers, further information might be required by the learner. However, leaving the study context to search for related material may lead to distraction or even abandonment of the learning task. Furthermore, traditional learning resources do not foster active learning. In this paper, we present SoLeMiO, a plugin for Office applications, which identifies key concepts in a document and thereby integrates related, heterogeneous resources from an open corpus. We employ concept recognition tools to determine concepts from different domains. Thereupon, resources from different repositories are suggested to the learner and can be consulted from within the current document. Aside from traditional learning resources, active learning is fostered through gamification activities. We showcase the applicability of our approach in multiple disciplines with concrete examples. [less ▲]

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See detailAre mutants really natural? A study on how “naturalness” helps mutant selection
Jimenez, Matthieu UL; Titcheu Chekam, Thierry UL; Cordy, Maxime UL et al

in 12th International Symposium on 
 Empirical Software Engineering and Measurement (ESEM'18) (2018, October 11)

Background: Code is repetitive and predictable in a way that is similar to the natural language. This means that code is ``natural'' and this ``naturalness'' can be captured by natural language modelling ... [more ▼]

Background: Code is repetitive and predictable in a way that is similar to the natural language. This means that code is ``natural'' and this ``naturalness'' can be captured by natural language modelling techniques. Such models promise to capture the program semantics and identify source code parts that `smell', i.e., they are strange, badly written and are generally error-prone (likely to be defective). Aims: We investigate the use of natural language modelling techniques in mutation testing (a testing technique that uses artificial faults). We thus, seek to identify how well artificial faults simulate real ones and ultimately understand how natural the artificial faults can be. %We investigate this question in a fault revelation perspective. Our intuition is that natural mutants, i.e., mutants that are predictable (follow the implicit coding norms of developers), are semantically useful and generally valuable (to testers). We also expect that mutants located on unnatural code locations (which are generally linked with error-proneness) to be of higher value than those located on natural code locations. Method: Based on this idea, we propose mutant selection strategies that rank mutants according to a) their naturalness (naturalness of the mutated code), b) the naturalness of their locations (naturalness of the original program statements) and c) their impact on the naturalness of the code that they apply to (naturalness differences between original and mutated statements). We empirically evaluate these issues on a benchmark set of 5 open-source projects, involving more than 100k mutants and 230 real faults. Based on the fault set we estimate the utility (i.e. capability to reveal faults) of mutants selected on the basis of their naturalness, and compare it against the utility of randomly selected mutants. Results: Our analysis shows that there is no link between naturalness and the fault revelation utility of mutants. We also demonstrate that the naturalness-based mutant selection performs similar (slightly worse) to the random mutant selection. Conclusions: Our findings are negative but we consider them interesting as they confute a strong intuition, i.e., fault revelation is independent of the mutants' naturalness. [less ▲]

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See detailEntwicklung der zweiten Generation des Eurocodes 4 - Neuerungen in der Bemessung für Verbundtragwerke aus Stahl und Beton
Schäfer, Markus UL; Mensinger, Martin

Scientific Conference (2018, October 11)

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See detailInsights into the performance and configuration of TCP in Automotive Ethernet Networks
Navet, Nicolas UL; Migge, Jörn

Scientific Conference (2018, October 10)

TCP has become an integral part of the Autosar communication stack located immediately below the Socket Adaptor layer. There are numerous use-cases for TCP in automotive networks. First TCP can be ... [more ▼]

TCP has become an integral part of the Autosar communication stack located immediately below the Socket Adaptor layer. There are numerous use-cases for TCP in automotive networks. First TCP can be leveraged on by many higher-level protocols be it for diagnostic (DoIp), calibration protocols (XCP), service-oriented communications (SomeIP), FTP and HTTP transfer, or more specialized tasks like protocols for the control of electric vehicle charging. In addition, communication through standard TCP sockets simplifies the development and re-use of applications requiring reliable transmissions within the vehicle or with external end-systems (car2x, cloud-based services).If previous works focused on throughput as performance criterion, we here also consider the communication latencies and memory usage in the end-systems and switches. The first question explored by simulation is to quantify the importance of TCP configuration choices in the latencies that can be achieved with TCP. In particular, it is shown that turning off Nagle's algorithm in transmission and delayed acknowledgment in reception as Autosar is very beneficial in terms of latencies but at the expense of throughput. We then extend the experiments to integrate the interactions between the Socket Adaptor and TCP layers. Finally, we study the performance of TCP streams as part of a complete automotive TSN case-study made up of control traffic, audio/video streams and best-effort traffic to evaluate the impact of higher priority traffic classes on TCP streams throughput and delays. The contribution of this work is twofold. First, we draw up a panorama of the TCP features and configuration options available in Autosar. Second, through experiments on models increasingly close to an implementation, we provide quantified insights in what we can expect from TCP in terms of latencies and throughput with the different configuration options available to us. [less ▲]

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See detailDoes Born-Digital Heritage turn Historians into Digital Historians?
Schafer, Valerie UL

Scientific Conference (2018, October 10)

On three levels within digital history - the use of (1) digital sources, (2) digital tools (3) digital narratives, this presentation aims to demonstrate how the practice of born-digital heritage opens new ... [more ▼]

On three levels within digital history - the use of (1) digital sources, (2) digital tools (3) digital narratives, this presentation aims to demonstrate how the practice of born-digital heritage opens new possibilities but also issues for historians. [less ▲]

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See detailOral History and Linguistic Analysis. A Study in Digital and Contemporary European History
Armaselu, Florentina UL; Danescu, Elena UL; Klein, Francois UL

Scientific Conference (2018, October 09)

The article presents a workflow for combining oral history and language technology, and for evaluating this combination in the context of European contemporary history research and teaching. Two ... [more ▼]

The article presents a workflow for combining oral history and language technology, and for evaluating this combination in the context of European contemporary history research and teaching. Two experiments are devised to analyse how interdisciplinary connections between history and linguistics are built and evaluated within a digital framework. The longer term objective of this type of enquiry is to draw an “inventory” of strengths and weaknesses of language technology applied to the study of history. [less ▲]

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See detailCombining PET imaging and blood metabolomics data to improve machine learning models for Parkinson’s disease diagnosis
Glaab, Enrico UL; Trezzi, Jean-Pierre UL; Greuel et al

Poster (2018, October 08)

Objective: To investigate whether the integration of PET imaging and metabolomics data can provide improved machine learning models for PD diagnosis. Background: The reliable diagnosis of PD can remain ... [more ▼]

Objective: To investigate whether the integration of PET imaging and metabolomics data can provide improved machine learning models for PD diagnosis. Background: The reliable diagnosis of PD can remain challenging, even at the motor stage. PET imaging can be used to confirm the clinical diagnosis. However, limitations in the robustness of predictive features extracted from the data and the costs associated with PET imaging restrict its application. Using blood metabolomics data as an additional information source may provide improved combined diagnostic models and/or an initial filter to decide on whether to apply PET imaging. Methods: Metabolomics profiling of blood plasma samples using gas chromatography coupled to mass spectrometry (GC­MS) was conducted in 60 IPD patients and 15 healthy controls. After pre-processing, these data were compared to neuroimaging data for subsets of the same individuals using FDOPA PET (44 patients and 14 controls) and FDG PET (51 patients and 15 controls). Machine learning models using linear support vector machines were trained on 50% of the data and evaluated on a 50% hold­out test set using Receiver Operating Characteristic (ROC) curves. Next, standardized FDOPA and FDG PET intensity measurements were combined with those from the metabolomics data to build and evaluate sample classification models in the same manner as for the individual datasets. Results: Both for the FDOPA and FDG PET data, the predictive performance given by the area under the ROC curve (AUC) was highest when combining imaging features with those from the metabolomics data (AUC for FDOPA + metabolomics: 0.98; AUC for FDG + metabolomics: 0.91). The performance was generally lower when using only the respective PET attributes (FDOPA: 0.94, FDG: 0.8) or only the metabolomics data (AUC: 0.66). [less ▲]

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See detail(Dis-)Continuities and Disruptions in Young People’s Transitions out of Residential and Foster Care
Göbel, Sabrina UL

Scientific Conference (2018, October 05)

The project “TransCare. Young People's Transitions out of Residential and Foster Care” of the University of Luxembourg focuses on researching the achievement of agency in constellations of transitions ... [more ▼]

The project “TransCare. Young People's Transitions out of Residential and Foster Care” of the University of Luxembourg focuses on researching the achievement of agency in constellations of transitions. One part of the project sheds a light on former care leaver’s perspectives on their transition processes out of institutional care settings. Therefore, it looks at the experiences of young people themselves.The retrospective and biographical interviews with people who had left the care system, three to seven years ago, give us the opportunity to reconstruct different forms and patterns of transition. On closer inspection, the analysis of the interviews reveals many disruptions, discontinuities, turning points and overlays in the trajectories of the young people already within the care system. There are multiple breaks that influence transitions in other systems, e.g. in the system of education. This leads to various challenges and uncertainties that respondents face. Moreover, in phases of transition specific constructions and changes of affiliation/belongings appear to be handled by the young people. The biographical approach shows in which dimensions young people positioning themselves towards their own person and the institutional setting. It also illustrates in which ways the former care leavers experience themselves in various ways as agentic subjects in their transitions and which conditions and resources play a role in this process of leaving an institutional organized setting. By contrasting the interviews, the reconstructive analysis reveals the relevance of belongings and social relations in leaving care processes. It is asking “how, in a context of increasingly fluid, unstable and mobile lives, young people build meaning through their connections with people and places over time” (Cuervo & Wyn 2017, p. 220) and how different ways and forms of agency are achieved during transition processes. [less ▲]

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See detailThe Levodopa Response Trial and the Parkinson Disease Digital Biomarker Challenge: Monitoring symptoms of Parkinson’s disease in the lab and home using wearable sensors
Daneault, J.; Vergara-Diaz, G.; Costante, G. et al

in Movement Disorders : Official Journal of the Movement Disorder Society (2018, October 03), 33(S2), 525

Objective: To leverage a community of researchers and shared wearable data to develop algorithms to estimate the severity of PD specific symptoms. Background: People with Parkinson’s disease (PwPD) often ... [more ▼]

Objective: To leverage a community of researchers and shared wearable data to develop algorithms to estimate the severity of PD specific symptoms. Background: People with Parkinson’s disease (PwPD) often experience fluctuations in motor symptom severity. Wearable sensors have the potential to help clinicians monitor symptoms over time, outside the clinic. However, to gather accurate and clinically-relevant measures, there is a need to develop robust algorithms based on clinically- labelled data. Methods: The Levodopa Response Trial captured three-axis acceleration from two wrist-worn sensors and a smartphone located at the waist from 29 PwPD continuously over 4 days. On day 1, in an in-clinic visit, participants performed clinical assessments and motor tasks on their regular medication regimen. During these visits, a clinician also provided symptom severity scores for tremor, bradykinesia, and dyskinesia. On days 2 & 3, sensor data was collected while participants were at home. On day 4, participants returned to the clinic for the same assessments as day 1, but arrived without having taken their medication for at least 10 hours. Leveraging this dataset, Sage Bionetworks, the Michael J Fox Foundation and the Robert Wood Johnson Foundation launched the PD Digital Biomarker DREAM Challenge which made a subset of the data available to researchers to develop robust and accurate algorithms for the estimation of specific symptoms’ severity. Results: Teams participating in the challenge used several technical approaches, from signal processing to deep learning. 35 submissions were received for the estimation of action tremor severity. Teams achieved an area under the precision-recall curve (AUPR) of 0.444 to 0.75. As for dyskinesia during movement, 37 submissions were received and the teams achieved an AUPR of 0.175 to 0.477. Finally, 39 submissions were received for the estimation of bradykinesia and the teams achieved an AUPR of 0.413 to 0.95. Null expectations for the testing datasets were 0.432, 0.195, and 0.266, respectively. Conclusions: Making datasets available to the community leverages the creativity of different groups to develop robust and accurate algorithms for the estimation of PD symptom severity. This will lead to better quality and interpretability of data collected in unsupervised settings within the community. [less ▲]

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See detailThe Price of Privacy in Collaborative Learning
Pejo, Balazs UL; Tang, Qiang UL; Gergely, Biczok

Poster (2018, October)

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 enough data to train a reasonably accurate model. For such organizations, a realistic solution is to train machine learning models based on a 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, 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. [less ▲]

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See detailThe Influence of Code Coverage Metrics on Automated Testing Efficiency in Android
Dashevskyi, Stanislav UL; Gadyatskaya, Olga UL; Pilgun, Aleksandr UL et al

Poster (2018, October)

Code coverage is an important metric that is used by automated Android testing and security analysis tools to guide the exploration of applications and to assess efficacy. Yet, there are many different ... [more ▼]

Code coverage is an important metric that is used by automated Android testing and security analysis tools to guide the exploration of applications and to assess efficacy. Yet, there are many different variants of this metric and there is no agreement within the Android community on which are the best to work with. In this paper, we report on our preliminary study using the state-of-the-art automated test design tool Sapienz. Our results suggest a viable hypothesis that combining different granularities of code coverage metrics can be beneficial for achieving better results in automated testing of Android applications. [less ▲]

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See detailFacilitating Privacy-preserving Recommendation-as-a-Service with Machine Learning
Wang, Jun UL; Arriaga, Afonso; Tang, Qiang et al

Poster (2018, October)

Machine-Learning-as-a-Service has become increasingly popular, with Recommendation-as-a-Service as one of the representative examples. In such services, providing privacy protection for users is an ... [more ▼]

Machine-Learning-as-a-Service has become increasingly popular, with Recommendation-as-a-Service as one of the representative examples. In such services, providing privacy protection for users is an important topic. Reviewing privacy-preserving solutions which were proposed in the past decade, privacy and machine learning are often seen as two competing goals at stake. Though improving cryptographic primitives (e.g., secure multi-party computation (SMC) or homomorphic encryption (HE)) or devising sophisticated secure protocols has made a remarkable achievement, but in conjunction with state-of-the-art recommender systems often yields far-from-practical solutions. We tackle this problem from the direction of machine learning. We aim to design crypto-friendly recommendation algorithms, thus to obtain efficient solutions by directly using existing cryptographic tools. In particular, we propose an HE-friendly recommender system, refer to as CryptoRec, which (1) decouples user features from latent feature space, avoiding training the recommendation model on encrypted data; (2) only relies on addition and multiplication operations, making the model straightforwardly compatible with HE schemes. The properties turn recommendation-computations into a simple matrix-multiplication operation. To further improve efficiency, we introduce a sparse-quantization-reuse method which reduces the recommendation-computation time by $9\times$ (compared to using CryptoRec directly), without compromising the accuracy. We demonstrate the efficiency and accuracy of CryptoRec on three real-world datasets. CryptoRec allows a server to estimate a user's preferences on thousands of items within a few seconds on a single PC, with the user's data homomorphically encrypted, while its prediction accuracy is still competitive with state-of-the-art recommender systems computing over clear data. Our solution enables Recommendation-as-a-Service on large datasets in a nearly real-time (seconds) level. [less ▲]

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See detailA Statistically Efficient Estimator for Co-array Based DoA Estimation
Sedighi, Saeid UL; Shankar, Bhavani UL; Ottersten, Björn UL

Poster (2018, October)

Co-array-based Direction of Arrival (DoA) estimation using Sparse linear arrays (SLAs) has recently gained considerable interest in array processing due to the attractive capability of providing enhanced ... [more ▼]

Co-array-based Direction of Arrival (DoA) estimation using Sparse linear arrays (SLAs) has recently gained considerable interest in array processing due to the attractive capability of providing enhanced degrees of freedom. Although a variety of estimators have been suggested in the literature for co-array-based DoA estimation, none of them are statistically efficient. This work introduces a novel Weighted Least Squares (WLS) estimator for the co-array-based DoA estimation employing the covariance fitting method. Then, an optimal weighting is given so that the asymptotic performance of the proposed WLS estimator coincides with the Cram\'{e}r-Rao Bound (CRB), thereby ensuring statistical efficiency of resulting WLS estimator. This implies that the proposed WLS estimator has significantly better performance compared to existing methods in the literature. Numerical simulations are provided to corroborate the asymptotic statistical efficiency and the improved performance of the proposed estimator. [less ▲]

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See detailMoonlightBox: Mining Android API Histories for Uncovering Release-time Inconsistencies
Li, Li; Bissyande, Tegawendé François D Assise UL; Klein, Jacques UL

in 29th IEEE International Symposium on Software Reliability Engineering (ISSRE) (2018, October)

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See detailEfficient 5G Edge Caching Over Satellite
Vu, Thang Xuan UL; Maturo, Nicola UL; Vupalla, Satyaranayana et al

Scientific Conference (2018, October)

The fifth generation (5G) wireless networks have to deal with the high data rate and stringent latency requirements due to the massive invasion of connected devices and data-hungry applications. Edge ... [more ▼]

The fifth generation (5G) wireless networks have to deal with the high data rate and stringent latency requirements due to the massive invasion of connected devices and data-hungry applications. Edge caching is a promising technique to overcome these challenges by prefetching the content closer to the end users at the edge node's local storage. In this paper, we analyze the performance of edge caching 5G networks with the aid of satellite communication systems. Firstly, we investigate the satellite-aided edge caching systems in two promising use cases: a) in dense urban areas, and b) in sparsely populated regions, e.g., rural areas. Secondly, we study the effectiveness of satellite systems via the proposed satellite-aided caching algorithm, which can be used in three configurations: i) mono-beam satellite, ii) multi-beam satellite, and iii) hybrid mode. Thirdly, the proposed caching algorithm is evaluated by using both empirical Zipf-distribution data and the more realistic Movielens dataset. [less ▲]

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