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See detailLa référence à l’Alsace-Lorraine dans le rattachement et l’intégration d’Eupen-Malmedy à la Belgique (1918-1925)
Brüll, Christoph UL

Scientific Conference (2018, February 09)

En novembre 1910, le Journal des Tribunaux, principal organe d’information des juristes belges, qualifie la partie wallonne du Kreis allemand de Malmedy de « notre Alsace-Lorraine » où se trouveraient des ... [more ▼]

En novembre 1910, le Journal des Tribunaux, principal organe d’information des juristes belges, qualifie la partie wallonne du Kreis allemand de Malmedy de « notre Alsace-Lorraine » où se trouveraient des « frères de race et de langue, exilés et emprisonnés en Prusse. » Le 20 septembre 1920, ce Kreis ainsi que celui d’Eupen, presque exclusivement germanophone, sont rattachés à la Belgique, suite au traité de Versailles et à un simulacre de consultation populaire. Dans notre contribution qui traitera de la période qui s’étend de l’occupation de la région par des troupes belges en août 1919 à la fin du régime transitoire en mars 1925, nous voudrions nous interroger sur la signification de la référence à l’Alsace-Lorraine pendant cette phase du changement de la nationalité. Des indices donnent à penser que cette référence n’est pas limitée aux discours de légitimation de l’annexion du territoire par la Belgique, mais que les autorités belges ont, à certaines occasions (comme l’introduction du service militaire), contacté leurs homologues français afin de connaître la politique d’intégration menée en Alsace-Lorraine. En revanche, il n’y a jamais eu d’étude systématique de cette référence idéelle et pratique. Notre proposition voudrait combler cette lacune et constituerait également une contribution à une histoire comparée de la transition étatique dans les deux territoires. [less ▲]

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See detailSimulation-Based Fault Injection as a Verification Oracle for the Engineering of Time-Triggered Ethernet networks
Fejoz, Loïc; Regnier, Bruno; Miramont, Philippe et al

Scientific Conference (2018, February 02)

TTEthernet (TTE) is considered for use as high-speed backbone in the avionics of next-generation orbital space launchers. Given the key role of communication in launchers, the OEM must acquire a precise ... [more ▼]

TTEthernet (TTE) is considered for use as high-speed backbone in the avionics of next-generation orbital space launchers. Given the key role of communication in launchers, the OEM must acquire a precise understanding of TTE’s functioning and its performances in nominal and error conditions. This holds especially true for the clock synchronization algorithm, the cornerstone of time-triggered communication in TTE, which involves complex distributed algorithms. In this study, we use both an experimental platform and fault-injection on a simulation model to gain quantified insights in these questions. We first describe a fine-grained simulation model of TTE model and discuss how it has been validated against communication traces recorded on the TTE platform. We then present experiments that evaluate the accuracy of the clock synchronization in TTE in the fault-free case as well as considering permanent link failure and transient transmission errors. Finally, we discuss what we have learned during the project in terms of development process and programming language support for complex simulation models used in the design of critical systems. [less ▲]

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See detailInsights on the Performance and Configuration of AVB and TSN in Automotive Ethernet Networks
Migge, Jörn; Villanueva, Josetxo; Navet, Nicolas UL et al

Scientific Conference (2018, February 02)

Switched Ethernet is profoundly reshaping in-car communications. To meet the diverse real-time requirements in automotive communications, Quality-of-Service protocols that go beyond the mere use of ... [more ▼]

Switched Ethernet is profoundly reshaping in-car communications. To meet the diverse real-time requirements in automotive communications, Quality-of-Service protocols that go beyond the mere use of priorities are required. In this work, the basic questions that we investigate on a case-study with diverse and demanding communication requirements is what can we expect from the various protocols aimed at providing a better timing Quality of Service on top of Ethernet? And how to use them? Especially how to use them in a combined manner. We will focus on the Credit-Based Shaper of AVB, the Time-Aware Shaper of TSN and the use of priorities as defined in IEEE802.1Q. The performance metrics considered are the distributions of the communication latencies, obtained by simulation, as well as upper bounds on these quantities obtained by worst-case schedulability analysis. If there have been over the last 5 years numerous studies on the performance of AVB CBS, the literature on comparing AVB to TSN and other candidate protocols is still sparse. To the best of our knowledge, this empirical study is the first to consider most protocols currently considered in the automotive domain, with the aim to gain insights into the different technological, design and configurations alternatives. In particular, an objective of this study is to identify key problems that need to be solved in order to further automate network design and configuration. [less ▲]

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See detailSurmonter les barrières linguistiques avec « MaGrid » - un outil de formation de pré-mathématiques pour un contexte scolaire multilingue
Cornu, Véronique UL; Pazouki, Tahereh UL; Schiltz, Christine UL et al

Scientific Conference (2018, January 11)

Le contexte scolaire luxembourgeois est caractérisé par le multilinguisme et une population scolaire hétérogène, ce qui nécessite la mise en place de pratiques pédagogiques qui prennent en compte ... [more ▼]

Le contexte scolaire luxembourgeois est caractérisé par le multilinguisme et une population scolaire hétérogène, ce qui nécessite la mise en place de pratiques pédagogiques qui prennent en compte l’hétérogénéité des élèves. Dans le domaine des mathématiques, qui semble être non-verbal à première vue, des résultats scientifiques montrent que les enfants dont la langue maternelle est différente de la langue d’instruction, atteignent sur des tests d’aptitudes pré-mathématiques des résultats significativement inférieurs à ceux de leurs camarades natifs. Ceci est d’autant plus inquiétant, sachant que ces aptitudes pré-mathématiques sont prédictives des apprentissages ultérieurs. Par conséquent, nous avons développé l’outil de formation de pré-mathématiques non-verbale « MaGrid ». « MaGrid » permet à chaque enfant de bénéficier pleinement d’une instruction préscolaire en mathématiques, indépendamment de ses compétences langagières. Cet outil se caractérise par sa nature visuelle et il est implémenté sur tablette tactile. Jusqu’à présent, nous avons implémenté et évalué « MaGrid » lors de deux études scientifiques. Les résultats quantitatifs des évaluations empiriques sont prometteurs, comme ils montrent des effets positifs sur les habilités entraînées chez les enfants ayant utilisé cet outil comparé à un groupe contrôle. Dans une première étude, l’outil a été utilisé auprès de cinq classes durant 10 semaines, comprenant deux séances de 20 minutes par semaine. Les résultats lors de petites épreuves spécifiques ont été comparés aux résultats d’élèves de cinq classes n’ayant pas d’entraînement spécifique, et des effets d’intervention ont été observés. Dans une deuxième étude, nous nous sommes focalisés sur un groupe d’enfants de langue minoritaire (le portugais). « MaGrid » a été utilisé lors d’un programme d’intervention de pré-mathématiques s’étendant sur les deux années scolaires de l’école préscolaire. Les analyses préliminaires ont abouti à des résultats positifs. Des effets bénéfiques se sont manifestés sur différentes mesures de pré-mathématiques chez les enfants ayant suivi notre programme par rapport aux enfants du groupe contrôle. [less ▲]

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See detailÉvaluations numériques: quel rôle pour l’expérience utilisateur ?
Pere, Maxime UL; Lallemand, Carine UL; Koenig, Vincent UL

Scientific Conference (2018, January)

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See detailAn elementary proof of the formal rigidity of the Witt and Virasoro algebra
Schlichenmaier, Martin UL

Scientific Conference (2017, December 19)

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See detailThe Missing Risk Premium in Exchange Rates
Penasse, Julien UL

Scientific Conference (2017, December 15)

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See detailHealth Behaviour in School-aged Children - Studienergebnisse der HBSC-Erhebung 2014
Heinz, Andreas UL

Scientific Conference (2017, December 13)

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See detailZugangsbarrieren im Gesundheitssystem - Ein Ländervergleich
Heinz, Andreas UL

Scientific Conference (2017, December 08)

In der international vergleichenden Forschung zu Gesundheitssystemen spielt der Zugang zu Gesundheitsleistungen eine zentrale Rolle. Entsprechende Typologien klassifizieren Gesundheitssysteme u.a. danach ... [more ▼]

In der international vergleichenden Forschung zu Gesundheitssystemen spielt der Zugang zu Gesundheitsleistungen eine zentrale Rolle. Entsprechende Typologien klassifizieren Gesundheitssysteme u.a. danach, ob Patienten Zuzahlungen leisten müssen, ob sie sich bei Hausärzten einschreiben müssen und nach welchen Regeln sie einen Facharzt konsultieren können (z.B. Reibling 2010, Wendt 2009, Böhm et al 2013). In der Typologie von Wendt gehört Österreich zum „Health service provision-oriented type“, der fast der gesamten Bevölkerung einen einfachen Zugang zu Gesundheitsleistungen bei geringen Zuzahlungen und freier Arztwahl ermöglicht (2009). Diese Typologien basieren jedoch auf den gesetzlichen Zugangsregeln in einem Land, nicht auf den subjektiven Erfahrungen der Bevölkerung mit Zugangsbarrieren. Im aktuellen European Social Survey (ESS) wurde nach diesen Barrieren gefragt: Haben Befragte medizinische Behandlungen nicht bekommen und was waren die Gründe (z.B. Kosten, Behandlung nicht erhältlich, Warteliste zu lang)? Der Vortrag stellt die Ergebnisse des ESS vor und geht auf folgende Fragen ein: • Wie häufig stoßen Kranke in Österreich und in anderen europäischen Ländern auf Zugangsbarrieren? • Welche Personen in Österreich sind besonders von Zugangsbarrieren betroffen? Die vorläufigen Ergebnisse deuten darauf hin, dass es durchaus nennenswerte Zugangsbarrieren im Gesundheitssystem Österreichs gibt und dass ohnehin benachteiligte Personen häufiger als andere auf Zugangsbarrieren stoßen. Für die wissenschaftliche Theorie stellt sich die Frage, ob die gängigen Typologien von Gesundheitssystemen um die subjektiven Erfahrungen ergänzt werden müssen. Für die Praxis stellt sich die Frage, wie schädlich Zugangsbarrieren sind und wie sie abgebaut werden können. [less ▲]

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See detailBlockchain Technology - Arsenal for a Shariah-Compliant Financial Ecosystem
Lacasse, Rcihard-Marc; Lambert, Berthe; Khan, Nida UL

Scientific Conference (2017, December 05)

The authors’ first challenge is to decipher the complexity of Islamic Finance despite the opacity of the sector. A second focal point is the agent’s agenda; in the Islamic Finance industry, contributors ... [more ▼]

The authors’ first challenge is to decipher the complexity of Islamic Finance despite the opacity of the sector. A second focal point is the agent’s agenda; in the Islamic Finance industry, contributors mandate intermediaries (agents) to transfer their contributions to social causes according to the Shariah; in principle, Islamic financial institutions must create value for their stakeholders by offering Shariah-compliant products and services. An underlying assumption of agency theory is that agents attempt to maximize their personal welfare and compensation, but such behaviour may not always be in the best interests of other stakeholders, and an analysis of the agent’s agenda can help explain how agents can fall off the pedestal of altruism. Relationships between Islamic banks and three key stakeholders (contributors, beneficiaries and regulators) are also explored via a complexity-aware monitoring process. Contributors provide funds to an Islamic bank (agent), and in return, the agent should be accountable to the contributors, but the form and degree of accountability can vary depending on the organization’s mission. There are many unanswered questions regarding the monitoring process. One objective of the article is to consider whether agents act in the best interests of the stakeholders. Finally, the authors explore the following question: Can blockchain technology and smart contracts support and enhance the transparency feature, which is the core underlying principle of all transactions in the Islamic Finance industry? A qualitative research framework was adopted because of the constraints of the enigmatic, secretive Islamic Finance culture. [less ▲]

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See detailOntologically stepping-up: A model for refugee entrepreneurship
Heilbrunn, Sibylle; Iannone, Rosa Lisa UL

Scientific Conference (2017, December 01)

This paper is a first attempt at proposing an integrated conceptual model that would bridge this gap in our knowledge of refugee entrepreneurship. Such a model might then enable for the understanding of ... [more ▼]

This paper is a first attempt at proposing an integrated conceptual model that would bridge this gap in our knowledge of refugee entrepreneurship. Such a model might then enable for the understanding of the super-diverse entrepreneurial strategies being employed by super-diverse refugees, within complex and super-diverse socio-economic and political settings – thereby, ontologically stepping-up our theoretical approaches and empirical insights into the phenomenon. [less ▲]

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See detailPreparing Future Teachers for Strategic Uses of Educational Technology: A Project-Based Approach
Reuter, Bob UL; Busana, Gilbert UL

Scientific Conference (2017, December 01)

Given (1) the need for teachers who are willing and able to design, implement and reflect meaningful and successful educational technology practices in schools and (2) the current rarity of strategic uses ... [more ▼]

Given (1) the need for teachers who are willing and able to design, implement and reflect meaningful and successful educational technology practices in schools and (2) the current rarity of strategic uses of ICT in education in Luxembourgish schools, the self-declared lack of competencies and the low confidence of teachers when it comes to teaching with ICT (Reuter, Busana & Linckels, 2016), we have designed, implemented and tested a project-based approach to the development of practice- oriented TPACK in pre-service teachers. Future teacher students are instructed to define an educational problem they want to solve, to explore existing pedagogical and technological solutions and to design an original solution that involves the strategic use of ICT (theoretically grounded and practically meaningful). They then have to implement the designed learning & teaching scenario in a classroom, to document the teaching & learning processes, to analyse, evaluate and to critically reflect them. Finally, they are required to write a structured report about their project and to present it to their peers and to interested teachers from schools. Overall, we observe that while most students become able to design and implement relatively meaningful educational technology practices, they still tend to feel that they are not ready to teach with technology in a more general sense, because their work was focused on one or two tools and does not give them access to a broader range of meaningful ICT-enriched teaching scenarios for their later professional career. [less ▲]

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See detailProbabilistic Analysis of Low-Criticality Execution
Küttler, Martin; Roitzsch, Michael; Hamann, Claude-Joachim et al

Scientific Conference (2017, December)

The mixed-criticality toolbox promises system architects a powerful framework for consolidating real-time tasks with different safety properties on a single computing platform. Thanks to the research ... [more ▼]

The mixed-criticality toolbox promises system architects a powerful framework for consolidating real-time tasks with different safety properties on a single computing platform. Thanks to the research efforts in the mixed-criticality field, guarantees provided to the highest criticality level are well understood. However, lower-criticality job execution depends on the condition that all high-criticality jobs complete within their more optimistic low-criticality execution time bounds. Otherwise, no guarantees are made. In this paper, we add to the mixed-criticality toolbox by providing a probabilistic analysis method for low-criticality tasks. While deterministic models reduce task behavior to constant numbers, probabilistic analysis captures varying runtime behavior. We introduce a novel algorithmic approach for probabilistic timing analysis, which we call symbolic scheduling. For restricted task sets, we also present an analytical solution. We use this method to calculate per-job success probabilities for low-criticality tasks, in order to quantify, how low-criticality tasks behave in case of high-criticality jobs overrunning their optimistic low-criticality reservation. [less ▲]

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See detailThe Time-Varying Risk of Macroeconomic Disasters
Penasse, Julien UL

Scientific Conference (2017, December)

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See detailFacing the Safety-Security Gap in RTES: the Challenge of Timeliness
Volp, Marcus UL; Kozhaya, David UL; Verissimo, Paulo UL

Scientific Conference (2017, December)

Safety-critical real-time systems, including real-time cyber-physical and industrial control systems, need not be solely correct but also timely. Untimely (stale) results may have severe consequences that ... [more ▼]

Safety-critical real-time systems, including real-time cyber-physical and industrial control systems, need not be solely correct but also timely. Untimely (stale) results may have severe consequences that could render the control system’s behaviour hazardous to the physical world. To ensure predictability and timeliness, developers follow a rigorous process, which essentially ensures real-time properties a priori, in all but the most unlikely combinations of circumstances. However, we have seen the complexity of both real-time applications, and the environments they run on, increase. If this is matched with the also increasing sophistication of attacks mounted to RTES systems, the case for ensuring both safety and security through aprioristic predictability loses traction, and presents an opportunity, which we take in this paper, for discussing current practices of critical realtime system design. To this end, with a slant on low-level task scheduling, we first investigate the challenges and opportunities for anticipating successful attacks on real-time systems. Then, we propose ways for adapting traditional fault- and intrusiontolerant mechanisms to tolerate such hazards. We found that tasks which typically execute as analyzed under accidental faults, may exhibit fundamentally different behavior when compromised by malicious attacks, even with interference enforcement in place. [less ▲]

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See detailValue-Added Modelling in Primary and Secondary School: An Integrative Review of 674 Publications
Levy, Jessica UL; Keller, Ulrich UL; Brunner, Martin et al

Scientific Conference (2017, December)

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See detailInnovative approaches for microfinance for youth
Leist, Anja UL; Chapet, Jérémie; Szelest, Linda

Scientific Conference (2017, November 28)

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See detailSome naturally defined star products for Kaehler manifolds
Schlichenmaier, Martin UL

Scientific Conference (2017, November 27)

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See detailDemo: MAMBA: A Platform for Personalised Multimodal Trip Planning
Faye, Sébastien UL; Cantelmo, Guido UL; Tahirou, Ibrahim UL et al

Scientific Conference (2017, November 27)

In recent years, multimodal transportation has become a challenging approach to route planning. Most existing planning systems usually rely on data sourced from different organisations, enabling the user ... [more ▼]

In recent years, multimodal transportation has become a challenging approach to route planning. Most existing planning systems usually rely on data sourced from different organisations, enabling the user to select a limited number of routing strategies. As part of the MAMBA project, developed in Luxembourg until 2017, we have been interested in the potential benefits of multimodal mobility systems. A key factor has been integrated into our studies: the need for a personalised experience at user level, whether when selecting the means of transport or describing user habits (e.g. route style, environment). In this context, we have developed a platform for planning personalised multimodal trips, broken down into the three main modules presented in this demonstration. More importantly, this platform has been developed to facilitate the daily mobility of people in Luxembourg, and considers datasets and characteristics that are specific to this region, which has an exceptionally high volume of daily commuting between Luxembourg and neighbouring countries. [less ▲]

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See detailWorking conditions and work-related anger: A longitudinal perspective
Steffgen, Georges UL; Sischka, Philipp UL

Scientific Conference (2017, November 24)

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See detailMobilités transfrontalières et développement économique et social des territoires frontaliers : l'exemple du nord d ela Lorraine
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid; Clément, Franz

Scientific Conference (2017, November 23)

Par leur ampleur, mais aussi leur pérennité, les mobilités transfrontalières au sein de la Grande Région SaarLorLux ne sont pas sans effets sur les dynamiques territoriales. Au Luxembourg, vers lequel ... [more ▼]

Par leur ampleur, mais aussi leur pérennité, les mobilités transfrontalières au sein de la Grande Région SaarLorLux ne sont pas sans effets sur les dynamiques territoriales. Au Luxembourg, vers lequel converge une grande partie des flux de travailleurs, le phénomène frontalier a des conséquences multiples (sur la consommation, les pratiques linguistiques, les transports, l’immobilier….). Le travail frontalier a également des impacts sur les régions de provenance des travailleurs . Il est devenu un important ressort de la dynamique économique et sociale de ces espaces géographiques. Sur un plan économique, il contribue à l’ajustement aussi bien quantitatif que qualitatif entre besoins en ressources humaines et besoins de production. Il est aussi à l’origine de nombreuses autres formes de mobilités (mobilités résidentielles, de consommation, de loisirs….) qui contribuent à dynamiser aussi bien les territoires d’emploi que de résidence. L’hypothèse que nous formulons est que le développement du travail frontalier impacte les trajectoires de développement économique et social des territoires frontaliers, particulièrement des territoires de résidence de ces travailleurs. Quelles sont les nouvelles activités structurantes du territoire en rupture avec le passé industriel (comme par exemple au nord de la Lorraine) ? Cette question a du sens dans un contexte où le travail frontalier est ancré dans les économies locales. En Lorraine, 10% de la population active occupée a son emploi de l’autre côté des frontières. A proximité directe des frontières, ce pourcentage augmente. Le travail frontalier concerne par exemple la moitié des actifs occupés habitant la zone d’emploi de Longwy. Notre proposition se focalisera sur cette zone d’emploi située au nord de la Lorraine, frontalière à la fois du Luxembourg et de la Belgique. Le choix de ce territoire s’explique surtout par les ruptures importantes de la structure économique et sociale locale avec l’activité industrielle passée de ce territoire et par l’ampleur des restructurations du système productif local. [less ▲]

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See detailConfronting corpora with coursebooks: the case of lecture listening
Deroey, Katrien UL

Scientific Conference (2017, November 23)

This paper confronts language use in the British Academic Spoken English (BASE) corpus with the representation of lectures in 25 listening coursebooks (Deroey, submitted; Deroey, 2017). Following key ... [more ▼]

This paper confronts language use in the British Academic Spoken English (BASE) corpus with the representation of lectures in 25 listening coursebooks (Deroey, submitted; Deroey, 2017). Following key tenets such as authenticity, specificity and needs analysis, English for Academic Purposes (EAP) materials development should be guided by an understanding of target genres and their communicative demands. Yet, lecture listening coursebooks have often been criticised for their lack of realistic lecture models (e.g. Alexander, Argent, & Spencer, 2008; Field, 2011; Thompson, 2003). The aspects of representativeness examined in these coursebooks are language, lecture authenticity and research-informedness. To assess the representativeness of language, signposts of important points are compared with those retrieved from the BASE corpus of 160 authentic lectures (Deroey, submitted; Deroey and Taverniers, 2012). The coursebook lectures are also analysed in terms of their source, delivery and length. The materials are further reviewed for their use of findings from research into listening comprehension and lecture discourse. Results suggest that current lecture listening materials often do not reflect the language and lectures students are likely to encounter on their degree programmes. Moreover, materials are typically not (systematically) informed by listening and lecture discourse research. These findings highlight the need for EAP practitioners to approach published materials critically and supplement or modify them in ways that would better serve students. References Alexander, O., Argent, S., & Spencer, J. (2008). EAP Essentials: a teacher’s guide to principles and practice. Reading: Garnet. Deroey, K. L. B. (submitted). The representativeness of lecture listening coursebooks: language, lectures, research-informedness. Deroey, K. L. B. (2017). How representative are EAP listening books of real lectures? . In J. Kemp (Ed.), Proceedings of the 2015 BALEAP Conference. EAP in a rapidly changing landscape: Issues, challenges and solutions. Reading: Garnet. Deroey, K. L. B., & Taverniers, M. (2012). Just remember this: Lexicogrammatical relevance markers in lectures. English for Specific Purposes, 31(4), 221-233.  Field, J. (2011). Into the mind of the academic listener. Journal of English for Academic Purposes, 10(2), 102-112.  Thompson, S. E. (2003). Text-structuring metadiscourse, intonation and the signalling of organisation in academic lectures. Journal of English for Academic Purposes, 2(1), 5-20.  [less ▲]

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See detailKonventionen und Tabus? Deutschlandbilder in Lüttich im langen 19. Jahrhundert
Brüll, Christoph UL

Scientific Conference (2017, November 22)

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See detailMarkers of lesser importance in lecture discourse
Deroey, Katrien UL

Scientific Conference (2017, November 22)

This paper surveys how less important lecture discourse is marked lexicogrammatically in the British Academic Spoken English (BASE) corpus (Deroey and Taverniers, 2012; Deroey, 2014). Such interpersonal ... [more ▼]

This paper surveys how less important lecture discourse is marked lexicogrammatically in the British Academic Spoken English (BASE) corpus (Deroey and Taverniers, 2012; Deroey, 2014). Such interpersonal, metadiscursive devices combine discourse organization with evaluation along a ‘parameter of importance or relevance’ (Thompson and Hunston, 2000: 24). They can help students discern the relative importance of points and so may aid lecture comprehension, note-taking and retention. The markers were first retrieved manually from 40 lectures and then using Sketch Engine from all 160 lectures. They fell into five categories: (i) message status markers (e.g. not pertinent, joke, anyway); (ii) topic treatment markers (e.g. briefly, not look at, for a moment); (iii) lecturer knowledge markers (e.g. not know, not remember); (iv) assessment markers (e.g. not examine, not learn); and (v) attention- and note-taking markers (e.g. ignore, not copy down). This study illustrates the challenge of identifying and quantifying pragmatic features in academic discourse. Few markers explicitly evaluated discourse as being unimportant (e.g. not pertinent) and few had an inherent meaning of lesser importance (e.g. incidentally). Instead, they depended rather heavily on pragmatic interpretation to achieve their effect and could generally be viewed as ‘muted signals’ (Swales and Burke, 2003: 17), expressing importance implicitly or cumulatively (cf. Hunston, 2011). Hence, Hunston’s observation that ‘much evaluative meaning is not obviously identifiable, as it appears to depend on immediate context and on reader assumptions about value’ (2004: 157) is particularly pertinent here. References Deroey, K. L. B. (2014). ‘Anyway, the point I'm making is’: Lexicogrammatical relevance marking in lectures. In L. Vandelanotte, D. Kristin, G. Caroline, & K. Ditte (Eds.), Recent Advances in Corpus Linguistics: Developing and Exploiting Corpora (pp. 265-291). Amsterdam/New York: Rodopi. Deroey, K. L. B., & Taverniers, M. (2012). ‘Ignore that' cause it's totally irrelevant’: Marking lesser relevance in lectures. Journal of Pragmatics, 44(14), 2085-2099. Hunston, S. (2004). Counting the uncountable: Problems of identifying evaluation in a text and in a corpus. In A. Partington, J. Morley, & L. Haarman (Eds.), Corpora and discourse (pp. 157-188). Bern: Peter Lang. Hunston, S. (2011). Corpus approaches to evaluation: phraseology and evaluative language (Vol. 13). New York: Routledge. Swales, J. M., & Burke, A. (2003). " Its really fascinating work": Differences in Evaluative Adjectives across Academic Registers. Language and Computers, 46(1), 1-18.  Thompson, G., & Hunston, S. (2000). Evaluation: An introduction. In Hunston, S., & Thompson, G. (Eds.), Evaluation in text: Authorial stance and the construction of discourse (pp. 1-27). Oxford: OUP. [less ▲]

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See detailDemystifying multilingualism at work, at home and at school
Kirsch, Claudine UL

Scientific Conference (2017, November 21)

What is multilingualism? How has our understanding of multilingualism, language learning and developing several languages in children at home and at school changed over the last century? Building on the ... [more ▼]

What is multilingualism? How has our understanding of multilingualism, language learning and developing several languages in children at home and at school changed over the last century? Building on the work of several leading scholars such as García, Creese and Blackledge, Li Wei, and Baker as well as on my own research, this interactive presentation will deconstruct traditional understandings of multilingualism and show that translanguaging, the use of one’s entire semiotic repertoire for communication, meaning-making and learning, is a normal practice. In addition, we will examine approaches such as “one-person-one-language” and “one-person-two-languages” and discuss some video excerpts illustrating how children use their multilingual repertoire in a crèche at and school. [less ▲]

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See detailEU citizens’ rights versus the Member States’ right to withdraw from the Union
Gerkrath, Jörg UL

Scientific Conference (2017, November 18)

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See detailConclusions
Pettiau, Hérold UL; Lemesle, Bruno; Lemaître, Nicole

Scientific Conference (2017, November 17)

This intervention consiste of concluding remarks of a conférence on the office of bishops as administrations of their diocèse within a region encompassing the Low Countries, dthe Duchy of Lorraine, the ... [more ▼]

This intervention consiste of concluding remarks of a conférence on the office of bishops as administrations of their diocèse within a region encompassing the Low Countries, dthe Duchy of Lorraine, the Alsace region, Switzelrand, south-Esastern France and the North of Italy, which were allegedly part of a sort of "catholic front" facing the Reformation. [less ▲]

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See detailAlternative Paths Towards Sustainable Localized Food Sovereignty. Convergence between Prosumers and Ethical Entrepreneurs over Time
Reckinger, Rachel UL

Scientific Conference (2017, November 14)

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, in a context of particularly low organic agricultural rates paradoxically ... [more ▼]

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, in a context of particularly low organic agricultural rates paradoxically paired with high consumer demands for organic produce, leading to a specific market of largely imported organic goods. As an encompassing reaction to this situation, a niche of social innovators are combining agro-ecological land use and food production with locavoracity and circular economy. Based on qualitative in-depth interviews and participant observation, we would like to expand on four micro-case studies of circular-economy-type fruit and vegetable production as well as unpackaged and/or socially responsible food retail in today’s Luxembourg. One has been established since the 1980s with over 150 employees, partly in social insertion measures, producing and importing organic fruits and vegetables, delivered via a classical box scheme system. Additionally, over the last three years three significantly smaller initiatives with higher citizen and/or community involvement have emerged. They are characterized by a cooperative governance structure, a claimed community-supported agricultural outlook, a more dynamic presence on social media and regular hands-on workshops and activities. These more recent initiatives are also more radical in their agro-ecological and/or permaculture practices, focusing on local production without relying on imports, as a politicized step further than mere (possibly industrialized) organic production, which is an altogether renewed enacting of circular economy precepts. Yet their position on the market is for the moment more fragile and marginal. Particularly, the retailers among them have to build creative consensus – according to specific priorities and stances – between their standards and the adjustment to consumers who, albeit sensitized, are in search for a certain variety and convenience. By focusing on heterodox experiences of more or less established alternative actors in diverse yet complementary food production and retail niches, we will explore topics such as emotional collective commitment and consensus-building, ethical entrepreneurship in relation to possibly reframed standards over time, governmentality, political enabling or disabling structures and regulations, as well as commodification and upscaling issues. Therefore, this paper touches on political processes and strategies, urban agro-ecological practices as well as post-capitalist economics. [less ▲]

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See detailAssociative and quasitrivial operations on finite sets (invited lecture)
Marichal, Jean-Luc UL; Couceiro, Miguel; Devillet, Jimmy UL

Scientific Conference (2017, November 10)

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See detailThe Missing Risk Premium in Exchange Rates
Penasse, Julien UL

Scientific Conference (2017, November 08)

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See detailThe Effects of Deskilling and Unemployment on Hiring Decisions
Samuel, Robin UL; Imdorf, Christian; Sacchi, Stefan et al

Scientific Conference (2017, November 08)

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See detailInsights on the performance and configuration of AVB and TSN in automotive applications
Navet, Nicolas UL; Villanueva, Josetxo; Migge, Jörn et al

Scientific Conference (2017, November 01)

Switched Ethernet is profoundly reshaping in-car communications. To meet the diverse real-time requirements in automotive communications, Quality-of-Service protocols that go beyond the mere use of ... [more ▼]

Switched Ethernet is profoundly reshaping in-car communications. To meet the diverse real-time requirements in automotive communications, Quality-of-Service protocols that go beyond the mere use of priorities are required. In this work, the basic questions that we investigate on a case-study with diverse and demanding communication requirements is what can we expect from the various protocols aimed at providing a better timing Quality of Service on top of Ethernet? And how to use them? Especially how to use them in a combined manner. We will focus on the Credit-Based Shaper of AVB, the Time-Aware Shaper of TSN and the use of priorities as defined in IEEE802.1Q. The performance metrics considered are the distributions of the communication latencies, obtained by simulation, as well as upper bounds on these quantities obtained by worst-case schedulability analysis. If there have been over the last 5 years numerous studies on the performance of AVB CBS, the literature on comparing AVB to TSN and other candidate protocols is still sparse. To the best of our knowledge, this empirical study is the first to consider most protocols currently considered in the automotive domain, with the aim to gain insights into the different technological, design and configurations alternatives. In particular, an objective of this study is to identify key problems that need to be solved in order to further automate network design and configuration. [less ▲]

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See detailAdvanced Interest Flooding Attacks in Named-Data Networking
Signorello, Salvatore UL; Marchal, Samuel; François, Jérôme et al

Scientific Conference (2017, October 30)

The Named-Data Networking (NDN) has emerged as a clean-slate Internet proposal on the wave of Information-Centric Networking. Although the NDN’s data-plane seems to offer many advantages, e.g., native ... [more ▼]

The Named-Data Networking (NDN) has emerged as a clean-slate Internet proposal on the wave of Information-Centric Networking. Although the NDN’s data-plane seems to offer many advantages, e.g., native support for multicast communications and flow balance, it also makes the network infrastructure vulnerable to a specific DDoS attack, the Interest Flooding Attack (IFA). In IFAs, a botnet issuing unsatisfiable content requests can be set up effortlessly to exhaust routers’ resources and cause a severe performance drop to legitimate users. So far several countermeasures have addressed this security threat, however, their efficacy was proved by means of simplistic assumptions on the attack model. Therefore, we propose a more complete attack model and design an advanced IFA. We show the efficiency of our novel attack scheme by extensively assessing some of the state-of-the-art countermeasures. Further, we release the software to perform this attack as open source tool to help design future more robust defense mechanisms. [less ▲]

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See detailEthereum: state of knowledge and research perspectives
Tikhomirov, Sergei UL

Scientific Conference (2017, October 24)

Ethereum is a decentralized application platform that allows users to write, deploy, and interact with smart contracts -- programs that encode financial agreements. A peer-to-peer network of mutually ... [more ▼]

Ethereum is a decentralized application platform that allows users to write, deploy, and interact with smart contracts -- programs that encode financial agreements. A peer-to-peer network of mutually distrusting nodes maintains a common view of the state of all accounts and executes smart contracts' code upon request. The global state is stored in a blockchain secured by a proof-of-work consensus mechanism similar to that in Bitcoin. The core value proposition of Ethereum is a Turing-complete programming language that enables implementing complex logic in smart contracts. Decentralized applications without a trusted third party are appealing in many areas, such as financial services, crowdfunding, and gambling. Smart contracts as a research topic contains many unsolved challenges and spans over areas ranging from cryptography, consensus algorithms, and programming languages to governance, ethical, and legal issues. This paper is the first to summarize the state of knowledge in this field. We provide a technical overview of Ethereum and outline open challenges along with proposed solutions. We also mention alternative blockchains with Turing complete programming capabilities. [less ▲]

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See detailGCAI 2017: 3rd Global Conference on Artificial Intelligence, Miami, FL, USA, 18-22 October 2017
Benzmüller, Christoph UL; Lisetti, Christine; Theobald, Martin UL

Scientific Conference (2017, October 18)

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See detailDigital health: navigating towards meaningful and sustainable solutions
Lygidakis, Charilaos UL

Scientific Conference (2017, October 18)

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See detailUnified Satellite and Terrestrial ACM Design
Haqiqatnejad, Alireza UL; Kayhan, Farbod UL

Scientific Conference (2017, October 17)

First step towards integrating satellite and terrestrial standards at the physical layer is to design a unified packet frame structure, and in particular, a unified adaptive coding and modulation (ACM ... [more ▼]

First step towards integrating satellite and terrestrial standards at the physical layer is to design a unified packet frame structure, and in particular, a unified adaptive coding and modulation (ACM) scheme without substantial loss in either of the systems. In this paper we introduce a methodology to design such a set of modulation and coding (MODCOD) combinations. In the first step, we design a set of base MODCODs for the AWGN channel. Then, for any other given channel model, we build a new set of MODCODs through a suitable transformation of the base MODCODs. We mainly focus on two types of channels: (a) non-linear satellite channels, and (b) AWGN channels with fading. We compare our results with latest digital video broadcasting standards, namely, DVB-T2 and DVB-S2X. [less ▲]

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See detailThe dialectic of transnational integration and national disintegration as mayor challenge of the aggregation of knowledge by European Expert Groups
Decieux, Jean Philippe Pierre UL

Scientific Conference (2017, October 14)

From a phenomenological perspective on modern systems of knowledge production a transformation towards a hybrid knowledge production has taken place. Categories like locality or embeddedness have been ... [more ▼]

From a phenomenological perspective on modern systems of knowledge production a transformation towards a hybrid knowledge production has taken place. Categories like locality or embeddedness have been overcome and rise of arenas of cross-broader-cooperation can be observed. The political sector is an important example where a rise of decision-making contexts with supra national relevance can be detected. As consequence a transformation of the political advisory-system towards the genesis of multinational advisory organisations on supranational level can be observed. This means that decision-making knowledge is developed and standardized on supranational level and supposed to be applied top-down on local level. Theoretically such a cooperative form of knowledge co-production of application-driven knowledge by a heterogeneous set of stakeholders aims to produce a context specific solution for specific problems of application (“socially robust knowledge”) in order to provide evidence-based policy-making. But in fact such a processes of unification of knowledge on supranational level often reduces national policy autonomy and is associated with the risk of limited compliance to the specific local needs. Thus the universal transnational knowledge is systematically contested by a variety of particularistic relevancies as is lacks in socially robustness for the application on national decision-making level (“dialectic of transnational integration and disintegration “. This paper analyses how national policy systems are responding to global integration initiatives. By using an in-depth-case-study, I focus especially on individual actors and their responses in the light of a multiplicity of institutional relevancies and the effective social robustness of the aggregated knowledge on national level. [less ▲]

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See detail“They can communicate, BUT…” - Language learning goals of forced migrants in multilingual Luxembourg
Kalocsanyiova, Erika UL

Scientific Conference (2017, October 13)

This contribution presents data from an ongoing doctoral research project that focuses on the linguistic integration trajectory of Syrian and Iraqi refugees in Luxembourg. Drawing on interview data and ... [more ▼]

This contribution presents data from an ongoing doctoral research project that focuses on the linguistic integration trajectory of Syrian and Iraqi refugees in Luxembourg. Drawing on interview data and classroom observations we explore teachers’ and learners’ attitudes towards Luxembourg’s main languages and their beliefs about how to approach language learning in a multilingual society. Upon arrival, refugees are immediately exposed to the country’s immense linguistic diversity along with ambiguous and often competing ideologies as to what languages to learn. While French is the main vernacular language, English has been gaining importance as lingua franca of the Grand Duchy’s large international community. Government sources increasingly emphasise the role of Luxembourgish as the sole language of integration, despite its minority position in several domains. Other languages such as German or Portuguese might be equally important for navigating local life. Refugees from regions where (a regional/dialectal form of) Arabic enjoys the status of majority language, are expected to encounter difficulties in adapting to the complex language situation of Luxembourg. As a result, the research participants have shown a strong interest in developing different capabilities in a variety of languages and for a range of purposes. Our data confirms that wide-ranging learning outcomes are pursued in this context. While teachers acknowledge the importance of this aspect for setting language learning goals, system-wide, policy-declared goals still prevail in their pedagogical practice. Yet, we have observed instances of more holistic approaches that recognize the multilingual character of communication and learning, and take better account of the learners’ short- and long-term expectations. [less ▲]

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See detailMagnetic SANS as a probe to disclose internal interfaces and the spin structure of nanoparticles
Michels, Andreas UL

Scientific Conference (2017, October 11)

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See detailThe Implementation of the Cross-Border Mergers Directive in Luxembourg - A Critical Assessment
Corbisier, Isabelle UL

Scientific Conference (2017, October 07)

Many cross-border mergers do take place in Luxembourg. Most practical difficulties in implementing the new regime were solved in the first months/years following the transposal of the Cross-Border Mergers ... [more ▼]

Many cross-border mergers do take place in Luxembourg. Most practical difficulties in implementing the new regime were solved in the first months/years following the transposal of the Cross-Border Mergers directive. As a matter of fact most of the cross-border mergers taking place in Luxembourg are of a rather uncomplicated kind as they are often intra-group mergers, between companies with no or very few employees and furthermore in a vast majority of cases between a parent company and its 100% subsidiary. In the most recent practice however, the following questions/issues were raised : - the directive only addresses mergers. Other restructurings such as divisions, transfers of assets, of a branch of activity or of the universality of the company’s assets are not covered by the directive and this even though they can likewise take place across the borders and can be difficult to carry out in the absence of some harmonized regime; - a new company law reform was recently adopted in Luxembourg, introducing, a.o., a new article 1865bis in the Civil Code that allows “dissolution-confusion” in one-shareholder companies. The question can be raised whether this provision could be applied across the borders (f.e. could a French company being the sole shareholder of a Luxembourg company decide to dissolve it without having to consider the provisions of the Cross-Border Mergers Directive ?); - another provision of the recently adopted company law reform does re-balance things when considering the cross-border merger as a means for the company to change “nationality” (or law applicable thereto). In the past companies were eventually forced to use the detour of the CBM in order to avoid the requirement of unanimity imposed by law for the transfer of the seat. Since aforementioned reform unanimity is no longer required for the cross-border transfer of the seat. The usefulness of the Cross-Border Merger Directive is therefore not in the least questioned in Luxembourg but it is regrettable that this would appear part of a “work-in-progress” that however does not show concrete signs of being completed any time soon. [less ▲]

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See detailCreditor Protection in Private Companies - the Luxembourg Experience
Corbisier, Isabelle UL

Scientific Conference (2017, October 06)

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See detailItaliani fuggitivi o semplici “gondolieri” dello spazio?
Cicotti, Claudio UL

Scientific Conference (2017, October 06)

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See detailGrenzüberschreitende Berufsausbildung als Prozess grenzüberschreitenden Lernens
Funk, Ines; Nienaber, Birte UL; Dörrenbächer, H. Peter

Scientific Conference (2017, October 03)

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See detailImaginationen der Macht: Über ästhetischen Autoritarismus
Kohns, Oliver UL

Scientific Conference (2017, October)

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See detailGesellschaftlicher Wandel als Re-Formierung sozialer Praxis: Analytische Zugänge
Wille, Christian UL

Scientific Conference (2017, October)

In Abgrenzung zu herkömmlichen Beschreibungen von gesellschaftlichen Verhältnissen entwerfen Praxistheorien eine Vision von Sozietät, die performativ angelegt ist, Materialität und Körperlichkeit betont ... [more ▼]

In Abgrenzung zu herkömmlichen Beschreibungen von gesellschaftlichen Verhältnissen entwerfen Praxistheorien eine Vision von Sozietät, die performativ angelegt ist, Materialität und Körperlichkeit betont und Formen des Wandels integriert. Allerdings geben die Praxistheorien (zunächst) keine modellhaften Erklärungen für gesellschaftliche Verhältnisse oder verweisen (offenkundig) auf Stellschrauben für die Steuerung des Sozialen. Im Sinne einer dynamischen Heuristik bieten sie vielmehr vielfältige und miteinander verknüpfte Beschreibungs- und Analysekategorien, treffen Aussagen über (angenommene) Zusammenhänge und versuchen die Heterogenität und Widersprüchlichkeit des Sozialen als Vollzugswirklichkeiten zu greifen. Der Vortrag setzt an dieser Stelle an und will die Chancen und Grenzen einer praxistheoretischen Reformulierung und Untersuchung von gesellschaftlichen Verhältnissen unter dem Aspekt von Wandel umreißen. Dafür wird besonders auf den flexiven Charakter von sozialen Praktiken eingegangen (In/Stabilität), das Moment der Praxislogik entwickelt (Wissen) und gefragt, inwiefern Praxistheorien eine diachrone Perspektive vorsehen (Rekonfiguration). Letztere erscheint unverzichtbar für die Thematisierung von Wandel und soll helfen praxistheoretisch orientierte Ansatzpunkte seiner Untersuchung zu identifizieren. Der Vortrag verzichtet auf empirische Beispiele, überträgt die Überlegungen allerdings auf Fragen des Forschungsprozesses. [less ▲]

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See detailEnclave-Based Privacy-Preserving Alignment of Raw Genomic Information
Volp, Marcus UL; Decouchant, Jérémie UL; Lambert, Christoph UL et al

Scientific Conference (2017, October)

Recent breakthroughs in genomic sequencing led to an enormous increase of DNA sampling rates, which in turn favored the use of clouds to e ciently process huge amounts of genomic data. However, while ... [more ▼]

Recent breakthroughs in genomic sequencing led to an enormous increase of DNA sampling rates, which in turn favored the use of clouds to e ciently process huge amounts of genomic data. However, while allowing possible achievements in personalized medicine and related areas, cloud-based processing of genomic information also entails signi cant privacy risks, asking for increased protection. In this paper, we focus on the rst, but also most data-intensive, processing step of the genomics information processing pipeline: the alignment of raw genomic data samples (called reads) to a synthetic human reference genome. Even though privacypreserving alignment solutions (e.g., based on homomorphic encryption) have been proposed, their slow performance encourages alternatives based on trusted execution environments, such as Intel SGX, to speed up secure alignment. Such alternatives have to deal with data structures whose size by far exceeds secure enclave memory, requiring the alignment code to reach out into untrusted memory. We highlight how sensitive genomic information can be leaked when those enclave-external alignment data structures are accessed, and suggest countermeasures to prevent privacy breaches. The overhead of these countermeasures indicate that the competitiveness of a privacy-preserving enclavebased alignment has yet to be precisely evaluated. [less ▲]

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See detailCharacterizing Driving Environments Through Bluetooth Discovery
Bronzi, Walter UL; Faye, Sébastien UL; Frank, Raphaël UL et al

Scientific Conference (2017, October)

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore ... [more ▼]

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore, having knowledge of nearby Bluetooth devices, both inside and outside other vehicles, can provide the listening vehicles with enough data to learn about their environment. In this paper, we collect and analyze a dataset of Bluetooth Classic (BC) and Low Energy (BLE) discoveries. We evaluate their respective characteristics and ability to provide context-aware information from a vehicular perspective. By taking a look at data about the encountered devices, such as GPS location, quantity, quality of signal and device class information, we infer distinctive behaviors between BC and BLE relative to context and application. For this purpose, we propose a set a features to train a classifier for the recognition of different driving environments (i.e. road classes) from Bluetooth discovery data alone. Comparing the performance of our classifier with different sampling parameters, the presented results indicate that, with our feature selection, we are able to predict with reasonable confidence up to three classes (Highway, City, Extra-Urban) by using only discovery data and no geographical information. This outcome gives promising results targeted at low energy and privacy-friendly applications and can open up a wide range of research directions. [less ▲]

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See detailAssessing adaptive task assignments in a simulated classroom setting
Hörstermann, Thomas UL

Scientific Conference (2017, October)

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See detailStout’s unconstrained discourse: Does reason-giving apply across the board?
Burks, Deven UL

Scientific Conference (2017, October)

If considerable scholarly attention has, to this point, focused on the content permitted in Jeffrey Stout’s pragmatist-expressivist account of political discourse and justification as reason-giving, set ... [more ▼]

If considerable scholarly attention has, to this point, focused on the content permitted in Jeffrey Stout’s pragmatist-expressivist account of political discourse and justification as reason-giving, set out in 2004’s Democracy and Tradition, little enough has been said on the scope which he envisions therefor. Can time-consuming and intensely individual reason-giving shape institutional and governmental discourse in the same way as it does face-to-face encounters, associational life and broad-based organizing? While one can concede that unconstrained discourse and appeal to an individual standpoint are appropriate to building consensus and legitimacy in the latter forms, as 2010’s Blessed are the Organized purports to show, one may nonetheless harbour doubts whether public officials could likewise engage in earnest personal narration and exchange of individual perspectives. For, despite the limited number of participants, it remains an open question whether such discourse represents either an appropriate or a practicable way of proceeding in such settings. Indeed, Stout’s own questions, in his 2010 book, as to the efficacy of grassroots groups and broad-based organizing at the state, national or international level, may leave one with the impression that there exists a gap between the individual and associational context and the institutional and governmental. This leaves us with two questions going forwards about unconstrained discourse and the individual standpoint. First, are these different settings sufficiently similar such that Stout’s version of political discourse displaces liberal public reason in institutional and governmental settings? Otherwise, does the former merely complement the latter, contrary to Stout’s assertions? Second, from a systemic point of view, is Stout’s version of public discourse deliberatively net-positive? In other words, as formulated, can it make an important contribution to the balance of the overall deliberative system? If these questions do not admit of an unqualified yes or no, there is reason to suspect that Stout’s account cannot be implemented equally at all levels of political discourse. In the end, we will argue that unconstrained discourse and the individual standpoint, while salutary, are incomplete in themselves and are best suited to a complementary role in institutional and governmental settings as, at most, one tactic among others. [less ▲]

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See detailOptimized non-orthogonal multiplexing in Peak Power Limited Channels
Alagha, Nader; Kayhan, Farbod UL; Montorsi, Guido

Scientific Conference (2017, October)

In this paper, we investigate the performance of optimized overlay modulation schemes and compare the results with both time division multiplexing and superposition modulation assuming a peak power ... [more ▼]

In this paper, we investigate the performance of optimized overlay modulation schemes and compare the results with both time division multiplexing and superposition modulation assuming a peak power limited AWGN channel. We show that significant gains can be achieved by properly designing the constellation set, specially in the presence of large SNIR imbalance between the user's link quality. We introduce two realistic case studies and present the results for each scenario. [less ▲]

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See detailMultiscale model of sintering: diffusion and plastic flow
Kabore, Brice Wendlassida UL; Peters, Bernhard UL

Scientific Conference (2017, September 27)

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub ... [more ▼]

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub-second time. This fast sintering force in the particular case of the snow contribute to the rheological behavior and grain rearrangement [1]. Understanding the kinetics of sintering in granular material is of great importance in some engineering applications. For decades, diffusional processes have received more attention in investigations related to the mechanisms behind sintering [2]. Some works have suggested that the plastic flow might be neglected in sintering process for stresses are not high enough to cause dislocation. However, some studies have showed that stresses experienced in fine particles necks can be high enough and even lead to plasticity driven sintering. The importance of each mechanism in the sintering process may lie in the temporal and spatial scale of interest. Increasing importance is being accorded to the role of plastic flow in sintering. however, several investigations have proved that the conventional plasticity theory may fail to predict plastic activity at micro-scale, The objective of this work is to develop adequate computational model that includes instantaneous and time-dependent plastic flow at micro-scale. We aim at extending existing models of sintering and plasticity to cope with multiple spatial and temporal scales simulations using Extended Discrete Element Method. The numerical results are compare to experimental data on snow. [less ▲]

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See detailInhalte und Ergebnisse einer Fortbildung zur Mehrsprachigkeitspädagogik in der frühen Kindheit
Kirsch, Claudine UL

Scientific Conference (2017, September 23)

Concepts and results of a continuous development course on the development of multilingual pedagogies in early childhood This presentation begins with the concepts of language development (e.g. dynamic ... [more ▼]

Concepts and results of a continuous development course on the development of multilingual pedagogies in early childhood This presentation begins with the concepts of language development (e.g. dynamic bilingualism, sociocultural theories of language learning) our professional development course on multilingual pedagogies was based on. I will then give some insights into the content of the course, show the beliefs that teachers and educators held regarding multilingualism, and show some examples of practices the latter filmed and discussed in the course. Finally, I present the results of a survey the practitioners carried our prior and after the course. The findings indicate an enhanced openness towards home languages and a weaker focus on Luxembourgish. [less ▲]

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See detailEnlarging the frame: Issues of Inclusion and mental health in an ageing society
Murdock, Elke UL; Ferring, Dieter UL

Scientific Conference (2017, September 22)

This contribution frames the notions of inclusion and mental health by describing trends in European societies at the social and economic level that will have direct consequences for a participative civil ... [more ▼]

This contribution frames the notions of inclusion and mental health by describing trends in European societies at the social and economic level that will have direct consequences for a participative civil society and social cohesion. Our starting point is the observation that the world faces challenges at the start of the 21st century that are new and unprecedented in its history. The four global forces that break all the trends known so far in human history include urbanisation, accelerating technological development, greater global connections, and population ageing (Dobbs, Manyika and Woetzel, 2016). We will first describe the scale of population ageing, as ageing populutions characterize several developed economies. In a second step, we will highlight some consequences of population ageing for social welfare and in a third part I will elaborate on the notion of justice and inclusion in rapidly changing societies. [less ▲]

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See detailInvolvement and Community participation
Limbach-Reich, Arthur UL

Scientific Conference (2017, September 22)

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See detailThe Time-Varying Risk of Macroeconomic Disasters
Penasse, Julien UL

Scientific Conference (2017, September 15)

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See detailInfluence of laser ablation and plasma surface treatment on the joint strength of laser welded aluminum-polyamide assemblies
Al Sayyad, Adham UL; Bardon, Julien; Hirchenhahn, Pierre et al

Scientific Conference (2017, September 14)

Laser assembly of a metal with a polymer is an innovative process for the development of hybrid lightweight structures. It was already demonstrated that surface treatment of aluminum prior to laser ... [more ▼]

Laser assembly of a metal with a polymer is an innovative process for the development of hybrid lightweight structures. It was already demonstrated that surface treatment of aluminum prior to laser joining has a critical influence on joint strength of laser assembly with polyamide. In this work, further investigation of the influence of surface treatment prior to laser assembly is carried out. In particular, two kind of surface modification pretreatments of aluminum, laser ablation and plasma surface modification, in combination with plasma surface pretreatment of polyamide, were investigated. Surface properties of aluminum and polyamide after pretreatment are compared to their untreated state. More precisely, surface chemistry, surface energy and roughness characteristics are evaluated by X-ray photoelectron spectroscopy (XPS), sessile drop tests and 3D profilometry, respectively. Joint strength of laser assembly of treated aluminum and polyamide is reported. The more influential surface characteristics for the improvement of joint strength are determined, paving the way to significant advances in metal-polymer laser assembly technology. [less ▲]

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See detailMultiscale Modelling of Damage and Fracture in Discrete Materials Using a Variational Quasicontinuum Method
Rokos, Ondrej; Peerlings, Ron; Beex, Lars UL et al

Scientific Conference (2017, September 05)

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See detailExposure to Sexualized Pictures Primes Occupational Stereotypes
Melzer, André UL; Ramsperger, Stephan

Scientific Conference (2017, September 05)

Gender stereotypes in advertisements, magazines, or videogames often appear in the form of sexualized portrayals of women characterized by inappropriately foregrounding female sexuality. Women are shown ... [more ▼]

Gender stereotypes in advertisements, magazines, or videogames often appear in the form of sexualized portrayals of women characterized by inappropriately foregrounding female sexuality. Women are shown with highly revealing clothing and engaging in seductive acts. Sexualization may serve as a motivator to adopt congruent gender-related stereotypes in the viewers and, thus, influence beliefs about women in the real world, including negative effects on self-efficacy of women (Behm-Morawitz & Mastro, 2009). In two studies, sexualization had similar adverse effects on participants’ spontaneous judgments of occupational stereotypes and job classification. In a field study (Study 1, N=128), sexualized female game characters were spontaneously associated with jobs of lower prestige (e.g., hairdresser). In contrast, non-sexualized portrayals were linked to jobs of higher status (i.e., physician, educator). This detrimental effect of sexualized portrayal on occupational status was replicated for depictions of male and female fashion models in an online survey (Study 2, N=459). Moreover, this effect was partially mediated by ratings of lower perceived competence for sexualized portrayals of both men and women. The findings of the present studies extend the multifaceted negative effects of sexualization on stereotyping by showing that the resulting spontaneous competence judgments may have detrimental job-related consequences. [less ▲]

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See detailEffects of ethnic group density on young migrants' health and health behaviour.
Kern, Matthias Robert UL; Willems, Helmut UL

Scientific Conference (2017, September 01)

Throughout the 20th century and the beginning of the current one there has been a drastic increase in ethnic diversity in many European societies. From a sociology of health perspective these developments ... [more ▼]

Throughout the 20th century and the beginning of the current one there has been a drastic increase in ethnic diversity in many European societies. From a sociology of health perspective these developments pose the question of how processes of acculturation, and with it levels of acculturative stress, often seen as responsible for many of the adverse health effects of migration, are altered if the standard assumption of an allochthonous ethnic minority acculturating to the ways of an autochthonous ethnic majority is violated. The ethnic density hypothesis suggests that an increase in own ethnic group density or overall ethnic minority density, through facilitating social support networks among co-ethnics, decreasing the rates and altering the perception of incidences of interpersonal racism and lowering the gap between acculturation and ecology can have a buffering effect on the adverse health effects of migrant status. This contribution, relying on data from the 2013-14 wave of the Luxembourgish Health Behaviour in School-Aged Children (HBSC) study, investigates the relationship between young migrants’ health and health behaviour and ethnic density in school classes. School classes, as an essential part of school-students’ immediate social environment, constitute an important acculturation context. At the same time, Luxembourg, as one of the most diverse countries in Europe, where almost two thirds of school-aged children have a migration background and only roughly 17% of first- and second-generation migrants attend classes with a native majority, presents itself as the ideal national context to explore the implications of increasing levels of ethnic diversity for migrant health and, due to its high variance in ethnic density between classes, offers enough statistical power to detect the sketched potential moderating effects. [less ▲]

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See detailFinding a job after precarious labour market experience. A cross-country factorial survey experiment with recruiters in Bulgaria, Greece, Norway and Switzerland
Imdorf, Christian; Shi, Lulu P.; Sacchi, Stefan et al

Scientific Conference (2017, September 01)

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See detailNatural Resource Management: A Network Perspective
Kyriakopoulou, Efthymia UL; Xepapadeas, Anastasios

Scientific Conference (2017, September)

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See detailPerspectives and transition experiences of adolescents and young adults with disabilities
Weis, Daniel UL; Mousset, Isabelle

Scientific Conference (2017, September)

Aims: The focus of the presentation is the specific situation of young people with disabilities during their transition period into adulthood. Methods: The presentation is based on 51 guideline-based ... [more ▼]

Aims: The focus of the presentation is the specific situation of young people with disabilities during their transition period into adulthood. Methods: The presentation is based on 51 guideline-based qualitative interviews with adolescents and young adults with a disability. The study was conducted within the framework of the Luxembourg Youth Report 2015 (Willems, 2015). Results: The aspirations and ideas of young people with disabilities about being and becoming an adult are little different from those of their able-bodied peers. For them, too, being an adult primarily means financial, emotional and social independence and autonomy. Nevertheless, it is obvious that for them the transition to self-reliant, independent adult life is more difficult: only one in seven of those questioned had found their first job on the labour market and one in two were still living with their parents. Conclusion: Our conclusion is that for adolescents and young adults with a disability, the transition to adulthood presents a disproportionately tough challenge compared with their able-bodied peers. Sociological and psychological theories (Hurrelmann & Quenzel, 2012; Havighurst, 1972) consider the successful accomplishment of certain developmental tasks as a master challenge of youth. Young people with disabilities have to cope with the same developmental tasks as young people without disabilities. However, achieving them is much more difficult, not only because of their physical, mental or psychiatric impairment but also because of the lack of respect and the stigmatisation that they experience in daily life. [less ▲]

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See detailOrganizational learning and complex problem solving. Towards a better understanding of the modern workplace.
Jaster, Christian UL; Mainert, Jakob; Greiff, Samuel UL

Scientific Conference (2017, September)

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See detailEmployable Middle Ages - MediävistInnen auf dem Arbeitsmarkt von morgen?
Bendheim, Amelie UL

Scientific Conference (2017, September)

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See detailParallelizing XDEM: Load-balancing policies and efficiency, a study
Rousset, Alban UL; Besseron, Xavier UL; Peters, Bernhard UL

Scientific Conference (2017, September)

In XDEM, the simulation domain is geometrically decomposed in regular fixed-size cells that are used to distribute the workload between the processes. The role of the partitioning algorithm is to ... [more ▼]

In XDEM, the simulation domain is geometrically decomposed in regular fixed-size cells that are used to distribute the workload between the processes. The role of the partitioning algorithm is to distribute the cells among all the processes in order to balance the workload. To accomplish this task, the partitioning algorithm relies on a computing/communication cost that has been estimated for each cell. A proper estimation of these costs is fundamental to obtain pertinent results during this phase. The study in the work is twofold. First, we integrate five partitioning algorithms (ORB, RCB, RIB, kway and PhG) in the XDEM framework [1]. Most of these algorithms are implemented within the Zoltan library [2], a parallel framework for partitioning and ordering problems. Secondly, we propose different policies to estimate the computing cost and communication cost of the different cells composing the simulation domain. Then, we present an experimental evaluation and a performance comparison of these partitioning algorithms and cost-estimation policies on a large scale parallel execution of XDEM running on the HPC platform of the University of Luxembourg. Finally, after explaining the pros and cons of each partitioning algorithms and cost-estimation policies, we discuss on the best choices to adopt depending on the simulation case. [less ▲]

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See detailKomplexes Problemlösen und Intelligenz
Greiff, Samuel UL

Scientific Conference (2017, September)

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See detailSelektives Enkodieren in figuralen Matrizen.
Domnick, Florian UL; Becker, Nicolas; Greiff, Samuel UL et al

Scientific Conference (2017, September)

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See detailDie Trainierbarkeit von komplexem Problemlösen im Rahmen eines Trainings für Experimentieren.
Stebner, Ferdinand; Kunze, Thiemo UL; Kemper, Christoph UL et al

Scientific Conference (2017, September)

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See detailZusammenhänge zwischen Zahlenstrahlschätzfähigkeit, Mathematikleistung und Schülercharakteristika: Eine Vollerhebung mit 6484 Luxemburgischen Neuntklässlern
Nurayadin, Sevim; Ugen, Sonja UL; Martin, Romain et al

Scientific Conference (2017, September)

In der Zahlenstrahlschätzaufgabe sehen die Probanden eine Zahl und einen leeren Zahlenstrahl, bei dem nur die erste und die letzte Position markiert und mit ihrem Wert beschriftet sind. Die Aufgabe der ... [more ▼]

In der Zahlenstrahlschätzaufgabe sehen die Probanden eine Zahl und einen leeren Zahlenstrahl, bei dem nur die erste und die letzte Position markiert und mit ihrem Wert beschriftet sind. Die Aufgabe der Probanden besteht darin, die Position der Zahl auf dem Strahl anzugeben. Der vorherrschende Ansatz in der Literatur geht davon aus, dass diese Aufgabe die Qualität der mentalen Repräsentation numerischer Größen erfasst. Diese gibt Lernen ein Verständnis von numerischen Größen und ihren Interrelationen, das eine wichtige Grundlage für den Erwerb anspruchsvollerer mathematischer Kompetenzen z.B. in Arithmetik oder Algebra darstellt. Zahlreiche Studien fanden positive Korrelationen zwischen der Zahlenstrahlschätzfähigkeit und der Mathematikleistung. Daher bietet es sich an, die Zahlenstrahlschätzaufgabe zur Diagnostik mathematischer Leistung und Entwicklung zu nutzen. Jedoch ist zum einen noch unklar, wie die Zahlstrahlschätzfähigkeit in der Population ausgeprägt und verteilt ist. Zum anderen ist offen, inwieweit die Korrelation mit der Mathematikleistung eine Scheinkorrelation darstellt, die auf den Einfluss anderer Personeneigenschaften zurückgeht. Um diese Punkte zu klären, analysierten wir Daten aus einer Vollerhebung aller Neuntklässler in Luxemburg (N = 6484). Die Schüler lösten die Zahlenstrahlschätzaufgabe mit ganzen Zahlen sowie Brüchen, absolvierten einen standardisierten Mathematikleistungstest und beantworteten zahlreiche Fragen zu domänenspezifischen (Matheängstlichkeit, Selbstkonzept, Interesse, Testmotivation) und domänenübergreifenden (Geschlecht, Immigrationsstatus, Gewissenhaftigkeit und elterlicher sozioökonomischer Status) Personenmerkmalen. Wir dokumentierten Mittelwerte und Verteilungseigenschaften der Zahlenstrahlschätzfähigkeit für diverse Subpopulationen (Jungen, Mädchen, Migranten, Schulformen etc.). Die Ergebnisse von Mehrebenenregressionsmodellen zeigten, dass die Zahlenstrahlschätzfähigkeit erheblich enger als alle anderen erhobenen Personeneigenschaften mit der Mathematikleistung zusammenhing. Der Zusammenhang war stärker für das Schätzen von Brüchen als ganzen Zahlen. Die Ergebnisse bestätigen die Annahme, dass die Zahlenstrahlschätzfähigkeit eine zentrale Komponente mathematischen Vorwissens erfasst, die weiteres Lernen leitet. In Anbetracht der einfachen Handhabung kann die Aufgabe vielfältig eingesetzt werden, um die mathematische Leistung in der Schule zu messen oder vorherzusagen. Zukünftige Studien sollten verstärkt die Nutzung der Aufgabe in Interventionen erproben. [less ▲]

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See detailIntroduction to Detection of Non-Technical Losses using Data Analytics
Glauner, Patrick UL; Meira, Jorge Augusto UL; State, Radu UL et al

Scientific Conference (2017, September)

Electricity losses are a frequently appearing problem in power grids. Non-technical losses (NTL) appear during distribution and include, but are not limited to, the following causes: Meter tampering in ... [more ▼]

Electricity losses are a frequently appearing problem in power grids. Non-technical losses (NTL) appear during distribution and include, but are not limited to, the following causes: Meter tampering in order to record lower consumptions, bypassing meters by rigging lines from the power source, arranged false meter readings by bribing meter readers, faulty or broken meters, un-metered supply, technical and human errors in meter readings, data processing and billing. NTLs are also reported to range up to 40% of the total electricity distributed in countries such as Brazil, India, Malaysia or Lebanon. This is an introductory level course to discuss how to predict if a customer causes a NTL. In the last years, employing data analytics methods such as data mining and machine learning have evolved as the primary direction to solve this problem. This course will compare and contrast different approaches reported in the literature. Practical case studies on real data sets will be included. Therefore, attendees will not only understand, but rather experience the challenges of NTL detection and learn how these challenges could be solved in the coming years. [less ▲]

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See detailInterkulturelle Annäherung im Zeichen der Exogamie - Kommunikationsstrategien im König Rother
Bendheim, Amelie UL

Scientific Conference (2017, September)

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See detailThe Time-Varying Risk of Macroeconomic Disasters
Penasse, Julien UL

Scientific Conference (2017, September)

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See detailStereotypen gegenüber SchülerInnen mit Förderbedarf: Überzeugungen von erfahrenen Lehrkräften, Lehramtsstudierenden und SchülerInnen
Krischler, Mireille UL; Pit-Ten Cate, Ineke UL; Krolak-Schwerdt, Sabine UL

Scientific Conference (2017, September)

„Stereotypen“ werden als sozial geteilte Meinungen über Verhaltensweisen und Persönlichkeitsmerkmale von Mitgliedern einer bestimmten Gruppe verstanden. Stereotypen beeinflussen nicht nur unser Denken und ... [more ▼]

„Stereotypen“ werden als sozial geteilte Meinungen über Verhaltensweisen und Persönlichkeitsmerkmale von Mitgliedern einer bestimmten Gruppe verstanden. Stereotypen beeinflussen nicht nur unser Denken und Verhalten, sondern haben auch Auswirkungen darauf, wie unsere Mitmenschen über sich selber denken und sich dementsprechend verhalten (z.B. Pygmalion Effekt). Aus den stereotyp-basierten Erwartungen gegenüber SchülerInnen mit Förderbedarf können Bildungsungleichheiten und eine reduzierte soziale Partizipation resultieren. Lehrerurteile können beispielsweise von Stereotypen geprägt sein und dementsprechend Bildungswege unangemessen beeinflussen. Ebenso können Schüler, geleitet von ihren stereotyp-basierten Überzeugungen, weniger bereit sein Freundschaften mit MitschülerInnen mit Förderbedarf einzugehen. Gemäss dem „Stereotyp Content Model“ (Fiske u.a., 2002) finden Einschätzungen von Aussengruppen entlang der Dimensionen „Wärme“ und „Kompetenz“ statt. Die „Wärme“ bestimmt dabei ob eine Person als negativ oder positiv wahrgenommen wird, wobei die „Kompetenz“ die Extremität dieses Eindrucks festlegt. Stereotypen sind verbunden mit differenziellen Emotionen. So werden z.B. warme Menschen mit niedriger Kompetenz als angenehm wahrgenommen. Ziel dieser Studie war die Ermittlung ob Überzeugungen über SchülerInnen mit Förderbedarf durch Stereotypen geprägt sind und diese je nach Förderbedarf variieren. Zusätzlich wurde untersucht ob Stereotypen zwischen den verschiedenen Akteuren in der Schule variieren (z.B. abhängig von professioneller Kompetenz). Lehrkräfte, Lehramtsstudierende und Schüler (N=103) bewerteten Schüler mit Verhaltensproblemen und Lernschwierigkeiten anhand von Vignetten in den beiden Dimensionen „Wärme und „Kompetenz“. SchülerInnen sowie Lehramtsstudierende kategorisierten Schüler mit Lernschwierigkeiten und Verhaltensproblemen beide als inkompetent. Schüler mit Verhaltensproblemen wurden zusätzlich auch als relativ kalt eingeschätzt, während Schüler mit Lernschwierigkeiten eher als warm wahrgenommen wurden. Erfahrene Lehrkräfte dagegen, bewerteten die Schüler mit Lernschwierigkeiten als warm aber inkompetent und die Schüler mit Verhaltensproblemen in beiden Dimensionen neutral. Unsere Befunde sind im Einklang mit vorherigen Forschungsergebnissen die belegen, dass Stereotypen je nach Förderbedarf varieren. Da Stereotypen Urteile und Verhalten beeinflussen, deuten unsere Befunde darauf hin, dass sich die Interaktionen mit SchülerInnen mit Lernschwierigkeiten und Verhaltensproblemen voneinander unterscheiden. [less ▲]

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See detailHealth inequalities in Youth: Do objective and subjective family affluence matter?
Residori, Caroline UL; Willems, Helmut UL

Scientific Conference (2017, August 31)

Detailed reference viewed: 10 (1 UL)