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See detailFinding Inequality in an Unlikely Place: Differences in Policy Congruence between Social Groups in Belgium
Lesschaeve, Christophe UL

in Acta Politica (2017), 52(3), 361383

This paper seeks to develop and test an issue-level determinants model of opinion congruence inequality between the privileged and the underprivileged social groups. Current theories on congruence ... [more ▼]

This paper seeks to develop and test an issue-level determinants model of opinion congruence inequality between the privileged and the underprivileged social groups. Current theories on congruence inequality and representation focus on country-level factors such as the interest group system or campaign finance. The existing literature focuses far less on variation in inequality in preference representation in a single context. To fill this void in the literature, we develop an issue-level model of opinion congruence inequality between the privileged and the underprivileged groups in terms of education and income. Based on an integrated dataset containing the policy positions of parties and voters in Belgium on 229 policy statements, we find that when social groups have different policy positions, preferences in the legislature align more with the preferences of the privileged social groups. In addition, opinion congruence inequality also depends on the importance of the issues to groups: the difference in opinion congruence is larger for economic and tax policies, vital to the privileged groups, but smaller on issues related to social welfare, crucial to the underprivileged groups. Finally, the results show that when voters of a group disagree with their party’s position on an issue, their preferences regarding that issue are less well represented in the legislature. [less ▲]

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See detailPID and Biomimetic Variable Structure Path Tracking Control in Automated Surface Finishing Processes
Klecker, Sophie UL; Plapper, Peter UL; Hichri, Bassem UL

in Robotix-Academy Conference for Industrial Robotics (RACIR) 2017 (2017)

This paper addresses freeform surface following control as one of the main challenges in automating surface finishing processes. Successive changes in constraints between the tool attached to the robotic ... [more ▼]

This paper addresses freeform surface following control as one of the main challenges in automating surface finishing processes. Successive changes in constraints between the tool attached to the robotic manipulator and its surroundings are due to complex workpiece-geometries and result in a switched nonlinear system. The control problem of the latter is addressed by industrial state-of-the-art conventional PID control as well as by biomimetic variable structure control which are both applied to a benchmark path tracking problem as characteristically encountered in surface finishing. [less ▲]

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See detailResistivity scaling in metallic thin films and nanowires due to grain boundary and surface roughness scattering
Moors, Kristof UL; Sorée, B.; Magnus, W.

in Microelectronic Engineering (2017), 167

A modeling approach, based on an analytical solution of the semiclassical multi-subband Boltzmann transport equation, is presented to study resistivity scaling in metallic thin films and nanowires due to ... [more ▼]

A modeling approach, based on an analytical solution of the semiclassical multi-subband Boltzmann transport equation, is presented to study resistivity scaling in metallic thin films and nanowires due to grain boundary and surface roughness scattering. While taking into account the detailed statistical properties of grains, roughness and barrier material as well as the metallic band structure and quantum mechanical aspects of scattering and confinement, the model does not rely on phenomenological fitting parameters. [less ▲]

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See detailLa cohérence textuelle et la grammaire de la phrase dans les productions écrites de doctorants
Lejot, Eve UL

in LIDIL : Revue de Linguistique et de Didactique des Langues (2017), 56

Cet article a pour objet de créer un pont entre la grammaire de la phrase et la cohérence textuelle dans le processus d’écriture des doctorants. Il s’appuie sur une étude de cas menée auprès de deux ... [more ▼]

Cet article a pour objet de créer un pont entre la grammaire de la phrase et la cohérence textuelle dans le processus d’écriture des doctorants. Il s’appuie sur une étude de cas menée auprès de deux groupes : les doctorants de sciences humaines d’un côté et ceux de droit de l’autre. Le corpus de cette recherche se compose de paragraphes écrits et retravaillés par les doctorants eux-mêmes dans le cadre d’un atelier d’écriture. La question-clé qui oriente la recherche est de savoir si l’approche par la grammaire de la phrase a une répercussion sur la qualité des écrits des doctorants. Les résultats de réécriture de paragraphes font apparaitre trois types de modifications. La principale modification se fait au sein même de l’énoncé et non du paragraphe. La seconde modification consiste en la réorganisation des énoncés au sein du paragraphe. Enfin, la troisième modification réalisée par les doctorants sur leur paragraphe est l’ajout d’un commentaire méta-réflexif indiquant leurs démarches. Par ailleurs, les deux versions du paragraphe sont grammaticalement correctes, la correction grammaticale n’est donc pas directement en cause, mais une bonne maîtrise de celle-ci aide à la construction de la pensée. [less ▲]

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See detailCoordination Mechanisms for Floating Content in Realistic Vehicular Scenario
Manzo, Gaetano; Soua, Ridha UL; Di Maio, Antonio UL et al

in Coordination Mechanisms for Floating Content in Realistic Vehicular Scenario (2017)

The increasing interest in vehicular communications draws attention to scalability and network congestion problems and therefore on techniques to offload the traffic, typically carried through the ... [more ▼]

The increasing interest in vehicular communications draws attention to scalability and network congestion problems and therefore on techniques to offload the traffic, typically carried through the infrastructure, to the Vehicle-to-vehicle (V2V) network. Floating content (FC) represents a promising paradigm to share ephemeral content without direct support from infrastructure. It is based on constraining geographically within the Anchor Zone (AZ) the opportunistic replication of a given content among vehicles, in a way that strikes a balance between minimization of resource usage and content availability. Existing works on FC performance modeling are based on standard, homogeneous synthetic mobility models, and it is hence unclear how they actually fit in realistic mobility scenarios. Moreover, the approaches to FC dimensioning they propose assume users have full knowledge of Spatio-temporal mobility patterns, which is hard to achieve in practice. Finally, despite FC is an infrastructure-less communication paradigm, some form of infrastructure support could be available in the vast majority of those application scenarios for which it has been proposed. In this paper, we perform a first attempt at tackling these issues. We focus on how to dimension an Anchor Zone in a realistic vehicular scenario. We propose the first set of simple dimensioning strategies, based on the estimation of some key mobility parameters and of FC performance. We assess such strategies on measurement-based vehicular traces, providing a first indication of their relative performance, and of the feasibility of FC in practical scenarios. [less ▲]

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See detail"March for Science" in Deutschland: Rückblick und Ausblick.
Baudson, Tanja UL

in Biologie in Unserer Zeit (2017)

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See detailInequality in Party-voter Opinion Congruence: A Matter of Choices Made or Choices Given?
Lesschaeve, Christophe UL

in Representation (2017), 53(2), 153-166

Studies on the agreement, or congruence, between voters and parties have often found more congruence between higher educated voters and the parties for which they vote than between lower educated voters ... [more ▼]

Studies on the agreement, or congruence, between voters and parties have often found more congruence between higher educated voters and the parties for which they vote than between lower educated voters and their party selections. The literature offers two explanations for this finding. The first argues that lower educated voters vote ‘incorrectly’, selecting less congruent parties at the ballot box, despite the presence of a better alternative. The second posits that they lack policy offers for which to vote. This paper seeks to detangle these two explanations. Based on a dataset containing the positions of Belgian voters and parties on 23 policy statements, we find that inequality in opinion congruence is primarily the result of incorrect voting by lower educated voters. However, given Belgium’s political system—which increase the likelihood of policy offers attuned to lower educated voters, the education bias in parties’ policy offers is surprisingly high. [less ▲]

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See detailOptical properties of Cu2ZnSnSe4 thin films and identification of secondary phases by spectroscopic ellipsometry
Demircioglu, Ozden; Salas, Jose Fabio Lopez; Rey, Germain UL et al

in OPTICS EXPRESS (2017), 25(5), 5327-5340

We apply spectroscopic ellipsometry (SE) to identify secondary phases in Cu2ZnSnSe4 (CZTSe) absorbers and to investigate the optical properties of CZTSe. A detailed optical model is used to extract the ... [more ▼]

We apply spectroscopic ellipsometry (SE) to identify secondary phases in Cu2ZnSnSe4 (CZTSe) absorbers and to investigate the optical properties of CZTSe. A detailed optical model is used to extract the optical parameters, such as refractive index and extinction coefficient in order to extrapolate the band gap values of CZTSe samples, and to obtain information about the presence of secondary phases at the front and back sides of the samples. We show that SE can be used as a non-destructive method for detection of the secondary phases ZnSe and MoSe2 and to extrapolate the band gap values of CZTSe phase. (C) 2017 Optical Society of America [less ▲]

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See detailSemantic annotation for places in LBSN through graph embedding
Wang, Yan; Qin, Zongxu; Pang, Jun UL et al

in Proceedings of the 26th ACM International Conference on Information and Knowledge Management - CIKM'17 (2017)

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See detailDie Figur des Grenzgängers. Vermeintliche Ordnungen in Frage gestellt
Wille, Christian UL

Article for general public (2017)

Das Thema der Grenzgänger ist populär – nicht nur in der Schweiz und in Luxemburg, wo zusammen fast eine halbe Millionen Menschen aus dem angrenzenden Ausland arbeiten. Auch andernorts sind sie sichtbar ... [more ▼]

Das Thema der Grenzgänger ist populär – nicht nur in der Schweiz und in Luxemburg, wo zusammen fast eine halbe Millionen Menschen aus dem angrenzenden Ausland arbeiten. Auch andernorts sind sie sichtbar, denn als Grenzgänger gelten nicht nur grenzüberschreitende Arbeitnehmer. Als Denkfigur für Gegenwartsphänomene fungieren sie in den Kulturwissenschaften schon seit langer Zeit. Was aber macht einen Grenzgänger aus und welche Facetten hat der Begriff? [less ▲]

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See detailThe Predictive Power of the Left-Right Self-Placement Scale for the Policy Positions of Voters and Parties.
Lesschaeve, Christophe UL

in West European Politics (2017), 40(2), 357-377

The left-right self-placement scale is often used in political science as a proxy for the policy positions of voters and parties. Yet studies have suggested that, for voters, this relation is dependent on ... [more ▼]

The left-right self-placement scale is often used in political science as a proxy for the policy positions of voters and parties. Yet studies have suggested that, for voters, this relation is dependent on education level. These studies were, however, hampered by data limitations and restricted statistical analyses. In addition, the extent to which the relation between the left-right self-placement scale and policy positions differs for parties and voters has not been explored. This article looks at the differential relation between left-right self-placement and policy positions for voters with different education levels on an integrated dataset containing over 50 voter and party policy positions. It is found that the left-right self-placement scale is a much better predictor for the policy positions of parties than it is for the policy preferences of voters. Robustness checks show that neither the saliency of the policy positions nor their complexity moderates these findings. [less ▲]

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See detailStruggling for the Future, Burdened by the Past: Croatia’s Relations with the United Kingdom from Independence to Brexit
Glaurdic, Josip UL

in Croatian International Relations Review (2017), 23(79), 5-39

Apart from relations with its neighbours, Croatia’s relations with the United Kingdom (UK) were undoubtedly its greatest international challenge since it won its independence in the early 1990s. Relations ... [more ▼]

Apart from relations with its neighbours, Croatia’s relations with the United Kingdom (UK) were undoubtedly its greatest international challenge since it won its independence in the early 1990s. Relations between the two countries during this period were frequently strained partly due to Zagreb’s democratic shortcomings, but partly also due to competing visions of post-Cold War Southeast Europe and due to long-lasting biases rooted in Croatia’s and Britain’s conflicting policies during Yugoslavia’s breakup and wars. Croatia’s accession to the EU in 2013 offered an opportunity for the two countries to leave the burdens of their past behind, since Zagreb and London had similar preferences on a number of crucial EU policy fronts. However, Brexit changed everything. Croatia’s future relations with the UK are likely to be determined by the nature of Brexit negotiations and the evolution of British policy toward the pace and direction of EU integration. [less ▲]

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See detailA New Modelling Framework over Temporal Graphs for Collaborative Mobility Recommendation Systems
Toader, Bogdan UL; Moawad, Assaad UL; Fouquet, François UL et al

Scientific Conference (2017)

Over the years, collaborative mobility proved to be an important but challenging component of the smart cities paradigm. One of the biggest challenges in the smart mobility domain is the use of data ... [more ▼]

Over the years, collaborative mobility proved to be an important but challenging component of the smart cities paradigm. One of the biggest challenges in the smart mobility domain is the use of data science as an enabler for the implementation of large scale transportation sharing solutions. In particular, the next generation of Intelligent Transportation Systems (ITS) requires the combination of artificial intelligence and discrete simulations when exploring the effects of whatif decisions in complex scenarios with millions of users. In this paper, we address this challenge by presenting an innovative data modelling framework that can be used for ITS related problems. We demonstrate that the use of graphs and time series in multi-dimensional data models can satisfy the requirements of descriptive and predictive analytics in real-world case studies with massive amounts of continuously changing data. The features of the framework are explained in a case study of a complex collaborative mobility system that combines carpooling, carsharing and shared parking. The performance of the framework is tested with a large-scale dataset, performing machine learning tasks and interactive realtime data visualization. The outcome is a fast, efficient and complete architecture that can be easily deployed, tested and used for research as well in an industrial environment. [less ▲]

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See detailToute la vie pour apprendre. Histoire de l´education des adultes au Luxembourg.
Lenz, Thomas UL

in Hemecht : Zeitschrift für Luxemburger Geschichte = Revue d'Histoire Luxembourgeoise (2017), 3-4(69), 479-482

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See detailThe discrete Pompeiu problem on the plane
Kiss, Gergely UL; Laczkovich, Miklós; Vincze, Csaba

in Monatshefte für Mathematik (2017)

We say that a finite subset $E$ of the Euclidean plane $\R^2$ has the discrete Pompeiu property with respect to isometries (similarities), if, whenever $f:\R^2\to \C$ is such that the sum of the values of ... [more ▼]

We say that a finite subset $E$ of the Euclidean plane $\R^2$ has the discrete Pompeiu property with respect to isometries (similarities), if, whenever $f:\R^2\to \C$ is such that the sum of the values of $f$ on any congruent (similar) copy of $E$ is zero, then $f$ is identically zero. We show that every parallelogram and every quadrangle with rational coordinates has the discrete Pompeiu property with respect to isometries. We also present a family of quadrangles depending on a continuous parameter having the same property. We investigate the weighted version of the discrete Pompeiu property as well, and show that every finite linear set with commensurable distances has the weighted discrete Pompeiu property with respect to isometries, and every finite set has the weighted discrete Pompeiu property with respect to similarities. [less ▲]

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See detailThe Visual in Histories of Education: A Reappraisal
Dussel, Inés; Priem, Karin UL

in Paedagogica Historica (2017), 53(6),

This introduction to the special issue on Images and Films as Objects to Think With presents a historiographical reflection on how images are being approached in the field of educational history. In ... [more ▼]

This introduction to the special issue on Images and Films as Objects to Think With presents a historiographical reflection on how images are being approached in the field of educational history. In recent years, much of the work has been situated at the intersection of visual and material studies; images are considered objects with which humans interact, carrying affects and particular materialities that condition their experience; they are taken as historical artefacts that bring out a plurality of meanings, which continue to grow with each new reading or approach. This introduction presents the articles that are included in this special issue as well as a final commentary written by Lynn Fendler that engages in a dialogue with them. The articles move away from considering the visual as a transparent source with a stable meaning, and open up different possibilities for working with and through it. They also problematise and expand the archives in which historians work; by looking at various surfaces in which images are exhibited and circulate, such as books, reports, art shows, films, magazines, and collective memories, these studies point to the “affective and effective histories” that images tell, and invite new research agendas for a visual history of education. [less ▲]

See detailLanguage Practices in Multilingual Legal Education: A Case Study at the University of Luxembourg
Uwera, Francine UL

Doctoral thesis (2016)

Abstract in English The effects of globalisation include the internationalisation of universities, executed for the purpose of quality improvement, restructuration or upgrading. At the higher education ... [more ▼]

Abstract in English The effects of globalisation include the internationalisation of universities, executed for the purpose of quality improvement, restructuration or upgrading. At the higher education level, internationalisation may be visible in the outline of the curriculum, the superdiversity of students’ and teachers’ origins and languages, as well as the establishment of student and staff exchange programmes. All these aspects lead to the need for communication in different languages and, in an increasing numbers of cases, the presence of languages of teaching and learning which are not the first languages of the teachers, students and administrative staff involved. Therefore, the trend towards internationalisation of universities around the world goes hand in hand with re-structuring related to language use and language choice. In other words, language being an essential component of education has become a major point in governance. The topic of the present thesis is situated in the area of the role of languages and multilingualism in higher education. The study addresses the problem of using a specific instructional language, French, English or German in our case, to learn content subjects in contexts where some of these languages may be a foreign language to students and teachers and in a field, which in many countries is traditionally considered bound to the nation-state and hence to a national language. With regard to the field of law, the situation in the multilingual country Luxembourg is particular in that the Luxembourgish law is formulated in French, to some extent in German but the national language is Luxembourgish. The study sets out to describe the linguistic practices applied in learning and teaching the law at the trilingual university of Luxembourg and investigating how students and teachers view these practices. Using a range of ethnographic methods, the study examines classroom practices in a specific multilingual context and the way participants view them, rather than assessing the appropriateness of the pedagogical means selected or applied by teachers in a normative sense. However, matters of general and legal pedagogy and legal theory will be accessorily although not thoroughly discussed. We hope that the study will contribute to increase the knowledge on this subject in general and be useful for this specific research terrain (Luxembourg) as well as for other similar contexts worldwide. [less ▲]

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See detailA systematic review on the engineering of software for ubiquitous systems
Sanchez Guinea, Alejandro UL; Nain, Gregory; Le Traon, Yves UL

in Journal of Systems and Software (2016), 118

Context: Software engineering for ubiquitous systems has experienced an important and rapid growth, however the vast research corpus makes it difficult to obtain valuable information from it. Objective ... [more ▼]

Context: Software engineering for ubiquitous systems has experienced an important and rapid growth, however the vast research corpus makes it difficult to obtain valuable information from it. Objective: To identify, evaluate, and synthesize research about the most relevant approaches addressing the different phases of the software development life cycle for ubiquitous systems. Method: We conducted a systematic literature review of papers presenting and evaluating approaches for the different phases of the software development life cycle for ubiquitous systems. Approaches were classified according to the phase of the development cycle they addressed, identifying their main concerns and limitations. Results: We identified 128 papers reporting 132 approaches addressing issues related to different phases of the software development cycle for ubiquitous systems. Most approaches have been aimed at addressing the implementation, evolution/maintenance, and feedback phases, while others phases such as testing need more attention from researchers. Conclusion: We recommend to follow existing guidelines when conducting case studies to make the studies more reproducible and closer to real life cases. While some phases of the development cycle have been extensively explored, there is still room for research in other phases, toward a more agile and integrated cycle, from requirements to testing and feedback. [less ▲]

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