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See detailUsing Passive Data Collection Methods to Learn Complex Mobility Patterns: An Exploratory Analysis
Toader, Bogdan UL; Cantelmo, Guido UL; Popescu, Mioara et al

Scientific Conference (in press)

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See detailValue-added modeling in primary school: What covariates to include?
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, August)

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See detailBenefits, challenges, social learning and controversies around Local Food Systems
Reckinger, Rachel UL; Nemes, Gusztav; Lajos, Veronika

Scientific Conference (2019, June 25)

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food ... [more ▼]

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food networks, approached from a collaborative and participatory angle, bring about a cultural shift by associating prosumers through a renewed form of trust, reciprocity and community, thus reinforcing social and ecological justice. At the same time, such heterodox actors in the transition to more sustainable food systems create new forms of knowledge, that are contested, co-constructed and potentially conflictual – along with enabling or disabling policymaking and, often, in dialogue with research. Our main objective is in this topic to start the process of creating an edited special issue of a peer reviewed journal (Sociologia Ruralis, Studies of Agricultural Economics or similar) should raise from this WG. We invite researchers working in the area of (local) food systems, alternative food networks, short food supply chains and related topics (rural tourism, community supported agriculture, etc.). We consider both the benefits and possible conflicts/problems in the connected socio-economic, cultural and environmental processes and welcome theoretical papers and case studies, too. Topic: By welcoming case studies from all geographical areas, in a comparative manner, this Working Group’s aim is to address different understandings and dynamics happening within and around different types of Local Food Systems (LFS). Alternative food networks, local food systems and short food supply chains have long been viewed as a sustainable, green way of raising the value added and creating opportunities for sur/re-vival of rural economy and society. They induce many benefits in terms of environmental impact, cultural exemplification, ethical entrepreneurship, social justice or rural development. Conceptually, LFS can be understood as ‘local food for local people’, as for example in the Slow Food or the community supported agriculture (CSA) movements. They are then associated with low food miles, environmental protection (Jones 2002), enhanced social networks and revitalised local communities (Fenstra 1997). From a local economic development perspective, in particular when LFS produce high quality products, they can equally be considered as ‘local food for non-local people’, either transported to urban centres, or attracting flows of tourists into rural areas. Here LFS can still enhance local businesses, economic and rural development, yet social and environmental benefits (Guthman 2004) of such foodstuffs, marketed with the added value of environmental and social responsibility, are more difficult to trace. Therefore, besides benefits, we would also like to analyse potential dissonances, that the distinction between local or extra-local target groups help to identify – for instance: • established, certified organic producers might criticize non-certified yet organically producing CSAs as fragmenting an already minority market or showing a lack of solidarity by not contributing to organic labels; • when LFS end up producing high quality, expensive products, a dynamic of social exclusion might occur, favoring the wealthy; • enhanced local production, tourism, and visitor pressure can cause social, economic, and environmental degradation, multiplier effects do not always occur to build more businesses and sustain social and economic capital; • innovative alternative food networks tend to struggle with territorial competition over land and resources, but if they rely on external investments, they might additionally be confronted – more insidiously – with the risk of co-option by neoliberal corporate agendas. We welcome analyses focusing on negotiations and struggles among actors in a multifaceted foodscape, where some block and some enhance transitions. Viewing the relationships, interconnectedness and agency of niche innovations, local and non-local appropriations as well regime hegemonies opens up the theoretical perspective of contested knowledge claims. We look for questions and answers including: • How are dynamics of “knowing and growing food in a contested arena” (Goodman, DuPuis, Goodman, 2014) negotiated – sometimes in a mutually enhancing and locally beneficial way, sometimes in more conflictual ways? • What are the local and extra-local stakeholders’ (producers, intermediaries, customers, tourists) different and often conflicting interests and responsibilities in LFS? • What can we learn from the tensions and local problems of LFS in order to support relevant policies to solve current controversies within the sector? • How can rural sociologists use their knowledge and influence to support local rural stakeholders of LFS? [less ▲]

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

Scientific Conference (2019, June 06)

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

Scientific Conference (2019, May)

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

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

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

Scientific Conference (2019, April)

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See detailPricing Perspective for SWIPT in OFDM-based Multi-User Wireless Cooperative Systems
Gautam, Sumit UL; Lagunas, Eva UL; Vuppala, Satyanarayana UL et al

Scientific Conference (2019, April)

We propose a novel formulation for joint maximization of total weighted sum-spectral efficiency and weighted sum-harvested energy to study Simultaneous Wireless Information and Power Transfer (SWIPT) from ... [more ▼]

We propose a novel formulation for joint maximization of total weighted sum-spectral efficiency and weighted sum-harvested energy to study Simultaneous Wireless Information and Power Transfer (SWIPT) from a pricing perspective. Specifically, we consider that a transmit source communicates with multiple destinations using Orthogonal Frequency Division Multiplexing (OFDM) system within a dual-hop relay-assisted network, where the destination nodes are capable of jointly decoding information and harvesting energy from the same radio-frequency (RF) signal using either the time-switching (TS) or power-splitting (PS) based SWIPT receiver architectures. Computation of the optimal solution for the aforementioned problem is an extremely challenging task as joint optimization of several network resources introduce intractability at high numeric values of relays, destination nodes and OFDM sub-carriers. Therefore, we present a suitable algorithm with sub-optimal results and good performance to compute the performance of joint data processing and harvesting energy under fixed pricing methods by adjusting the respective weight factors, motivated by practical statistics. Furthermore, by exploiting the binary options of the weights, we show that the proposed formulation can be regulated purely as a sum-spectral efficiency maximization or solely as a sum-harvested energy maximization problem. Numerical results illustrate the benefits of the proposed design under several operating conditions and parameter values. [less ▲]

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

Scientific Conference (2019, February)

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

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

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See detailGeneralizations of single-peakedness
Devillet, Jimmy UL

Scientific Conference (2019, January 30)

We establish a surprising connection between a family of conservative semigroups, which includes the class of idempotent uninorms, and the concepts of single-peakedness and single-plateaudness, introduced ... [more ▼]

We establish a surprising connection between a family of conservative semigroups, which includes the class of idempotent uninorms, and the concepts of single-peakedness and single-plateaudness, introduced in social choice theory by D. Black. We also introduce a generalization of single-peakedness to partial orders of join-semilattices and show how it is related to the class of idempotent and commutative semigroups. Finally, we enumerate those orders when the corresponding semigroups are finite. [less ▲]

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See detail"A Colônia Luxemburguesa" – Trajectories made of Steel
Santana, Dominique UL

Scientific Conference (2019, January 25)

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See detailIslamic Finance and Economic Growth: New Evidence
Lehnert, Thorsten UL

Scientific Conference (2019, January 24)

While extensive work has shown that conventional banking development is generally conducive to economic growth, there are only a limited number of studies that investigate the impact of Islamic banking ... [more ▼]

While extensive work has shown that conventional banking development is generally conducive to economic growth, there are only a limited number of studies that investigate the impact of Islamic banking. Importantly, the literature on conventional banking claims that a reverse causality from economy performance to banking may exists, but existing studies on Islamic banking fail to address this potential endogeneity problem. This paper tackles this problem and explores the relationship between Islamic banking development and economic performance in a sample of 32 developed and developing countries based on data spanning the 2000 to 2016 period. The findings show that, although Islamic banks are considered small relative to the total size of the financial sector, Islamic banking is positively correlated with economic growth even after controlling for financial structure, macroeconomic factors and other variables. The outcome is robust across different econometric specifications like pooling OLS, fixed effects, panel data with over-identified GMM, and dynamic difference GMM. The results are confirmed on two different indicators of Islamic banking and hold for different time periods. [less ▲]

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See detailMagnetic and free-layer properties of MgO/(Co)FeB/MgO structure: Dependence on CoFeB composition
Bersweiler, Mathias UL

Scientific Conference (2019, January 17)

Detailed reference viewed: 20 (4 UL)
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See detailComment assurer la qualité de l’évaluation par les pairs des propositions de communication dans le cadre d’un colloque scientifique ?
Milmeister, Marianne UL; Weis, Christiane UL; Dierendonck, Christophe UL

Scientific Conference (2019, January 10)

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

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

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See detailGender differences with regard to physical activity motivation and behavior in physical education and leisure time
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Scientific Conference (2019, January)

Objectives: Given a widespread continuous decrease in children’s and adoles-cents’ physical activity (PA), the potential of physical education (PE) in promoting young people’s PA motivation and behavior ... [more ▼]

Objectives: Given a widespread continuous decrease in children’s and adoles-cents’ physical activity (PA), the potential of physical education (PE) in promoting young people’s PA motivation and behavior has become a key issue in research. Based on the self-determination theory (SDT) of Deci and Ryan (1985), the present study aimed to ex-amine gender differences with regard to PA motivation and behavior during PE and lei-sure time (LT). Previously, girls were found to be more self-determined than boys (Wil-liams & Deci, 1996), but showed lower self-reported PA and were meeting the PA guide-lines of the WHO to a lesser extent (Trost et al., 2002). Method: 244 students (139 girls and 125 boys) from 11 to 21 years participated in the study. PA motivation was assessed via a digital questionnaire containing the scales need support (Standage, Duda and Ntoumanis, 2005), basic needs (BPNES; Vlachopou-los, Ntoumanis & Smith, 2010), external and intrinsic motivation in PE (PLOC-R; Vla-chopoulos et al., 2011) and in LT (BREQ-II; Markland & Tobin, 2004). PA behavior was measured through a self-report questionnaire (Schmidt, Will, Henn, Reimers & Woll, 2016). Additionally, 76 students (38 girls and 38 boys) wore an accelerometer (ActiGraph GT3X-BT) over seven consecutive days to measure PA behavior objectively, too. Results: With regard to PA motivation, girls reported a lower fulfillment in the basic need of competence during PE and scored higher in the external motivation during PE and LT than boys. In contrast, boys reported higher rates of intrinsic motivation during PE and LT. Concerning PA behavior, boys showed higher PA than girls for self-reported and objectively measured PA in PE and LT. Independently of gender, higher levels of intrinsic motivation were associated with increased self-reported PA. Discussion: In conflict with previous findings, girls reported a lower intrinsic motiva-tion in PA than boys. As girls simultaneously show lower self-reported and objectively measured PA, future intervention programs should focus on strengthening the more in-ternally driven behavior of girls in order to foster regular PA. Key Reference: Deci, E.L. & Ran, R.M. (1985). Intrinsic motivation and self-determination in human behav-ior. New York: Plenum Press. [less ▲]

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See detailMixed hybrid and electric bus dynamic fleet management in urban networks: a model predictive control approach
Rinaldi, Marco UL; Picarelli, Erika; Laskaris, Georgios UL et al

Scientific Conference (2019, January)

Reducing pollutant emissions and promoting sustainable mobility solutions, including Public Transport, are increasingly becoming key objectives for policymakers worldwide. In order to jointly achieve ... [more ▼]

Reducing pollutant emissions and promoting sustainable mobility solutions, including Public Transport, are increasingly becoming key objectives for policymakers worldwide. In order to jointly achieve these goals, careful consideration should be put on the operational cost and management of PT services, in order to promote the adoption of green mobility solutions and advanced management techniques by operators. In this work we develop a dynamic fleet management approach for next generation Public Transportation systems, considering the instance of mixed electric / hybrid fleet. Our objective is that of investigating to what extent electrification, coupled with optimal fleet management, can yield operational cost savings for PT operators, explicitly considering real-time disturbances, including delays, service disruptions etc. We propose a Mixed Integer Linear Program to address the problem of optimal scheduling of a mixed fleet of electric and hybrid / non-electric buses, and employ it as predictor in a Model Predictive Control approach. Test results based upon a real-life scenario showcase how the proposed approach is indeed capable of yielding a sizable reduction in operational costs, even when considerable disturbances arise from the underlying system. [less ▲]

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See detailKomparatistik als Praxis der Freiheit (Hans-Jost Frey, Werner Hamacher)
Kohns, Oliver UL

Scientific Conference (2019, January)

Detailed reference viewed: 27 (1 UL)
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See detailDas Ende der Reparaturarbeit?
Krebs, Stefan UL

Scientific Conference (2019)

Detailed reference viewed: 22 (5 UL)
See detailProducing a binaural radio play on the history of 3D sound recording
Krebs, Stefan UL

Scientific Conference (2019)

Detailed reference viewed: 14 (2 UL)
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See detailNegotiating the past, present, and future: The Luxembourgish Jewish Museum Project as a Process of Contested memory and imagined futures
Badder, Anastasia UL; Bronec, Jakub UL

Scientific Conference (2019)

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

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

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

Scientific Conference (2018, December 12)

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

Scientific Conference (2018, December 11)

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

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

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See detailModelling Scale in Historiographical Data
Armaselu, Florentina UL

Scientific Conference (2018, December 09)

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

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

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

Scientific Conference (2018, December 07)

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

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

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

Scientific Conference (2018, December 07)

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

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

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

Scientific Conference (2018, December 07)

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

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

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

Scientific Conference (2018, December 06)

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

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

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See detailMicrobiome: the environment within
Wilmes, Paul UL

Scientific Conference (2018, December)

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

Scientific Conference (2018, December)

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See detailSystems ecology of microbiomes
Wilmes, Paul UL

Scientific Conference (2018, December)

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See detailHealth access and wealth: Does capital structure matter?
Paccoud, Ivana; Leist, Anja UL

Scientific Conference (2018, December)

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

Scientific Conference (2018, December)

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

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

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

Scientific Conference (2018, December)

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

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

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

Scientific Conference (2018, December)

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

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

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

Scientific Conference (2018, November 30)

Detailed reference viewed: 42 (0 UL)
See detailHeterogeneity of beliefs in experimental asset markets revisited
Neugebauer, Tibor UL

Scientific Conference (2018, November 28)

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

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

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

Scientific Conference (2018, November 24)

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

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

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

Scientific Conference (2018, November 23)

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

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

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

Scientific Conference (2018, November 22)

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

Scientific Conference (2018, November 13)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 09)

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

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

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

Scientific Conference (2018, November 08)

Detailed reference viewed: 22 (2 UL)
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See detailChildren’s languaging and peer interactions in non-formal early childhood education in Luxembourg
Kirsch, Claudine UL; Aleksic, Gabrijela UL; Andersen, Katja Natalie UL

Scientific Conference (2018, November 08)

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

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

Detailed reference viewed: 57 (13 UL)
See detailExemplarische Bildungsverläufe von Jugendlichen in den Erziehungshilfen und im Übergang
Göbel, Sabrina UL

Scientific Conference (2018, November 08)

Detailed reference viewed: 16 (2 UL)
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See detailIt's not only the game, it's also the player: The role of player personality in violent video game preference
Holl, Elisabeth UL; Melzer, André UL

Scientific Conference (2018, November 03)

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

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

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See detailCompetition and Workplace Bullying. The moderating role of passive avoidant leadership style.
Sischka, Philipp UL; Steffgen, Georges UL

Scientific Conference (2018, November 02)

The aim of the study was to test if competition is a potential risk factor for the occurrence of workplace bullying and if this association depends on the level of passive avoidant leadership style. We ... [more ▼]

The aim of the study was to test if competition is a potential risk factor for the occurrence of workplace bullying and if this association depends on the level of passive avoidant leadership style. We proposed that competition and passive avoidant leadership style are positive related to workplace bullying exposure and perpetration. Furthermore, we hypothesized that the effect of competition on workplace bullying exposure and perpetration is moderated through passive avoidant leadership style. An online survey design was employed and data were collected among U.S. employees. The final sample consists of 1,408 respondents. Workplace bullying exposure and perpetration were cross-sectionally assessed via self-labeling and behavioral experience method. Hierarchical regression analyses showed that competition and passive avoidant leadership style are important predictors for workplace bullying exposure and perpetration. Furthermore, the results indicated that the effect of competition on workplace bullying exposure (measured via behavioral method) and self-labeled workplace bullying exposure and perpetration is moderated through passive avoidant leadership style. However, for workplace bullying perpetration (measured via behavioral method) no moderation effect was found. The findings underline the importance of the supervisor’s behavior in the occurrence of workplace bullying. Organizations may decrease workplace bullying incidents by training their supervisors to apply a more constructive leadership style. [less ▲]

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See detailOptimal dispatching of electric and hybrid buses subject to scheduling and charging constraints
Rinaldi, Marco UL; Parisi, Federico; Laskaris, Georgios UL et al

Scientific Conference (2018, November)

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

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

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

Scientific Conference (2018, November)

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

Scientific Conference (2018, November)

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

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

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

Scientific Conference (2018, November)

Detailed reference viewed: 44 (1 UL)
See detailAssociations of wealth with frailty and memory impairment across the course of aging
Leist, Anja UL

Scientific Conference (2018, November)

Detailed reference viewed: 14 (4 UL)
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See detailFrustration inducing tasks as tools for assessing adolescent emotion regulation
Battistutta, Layla UL; Steffgen, Georges UL

Scientific Conference (2018, November)

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among ... [more ▼]

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among adolescents in experimental settings are needed, but so far potential differences between already existing frustration inducing tasks are not well understood. The aim of the present study was thus to compare the efficacy of two non-verbal distress tolerance tasks – the Behavioural Indicator of Resiliency to Distress (BIRD, Lejuez et al.), and the Mirror Tracing Persistence Task (MPTP; Strong et al., 2003), in inducing frustration in a sample of 72 adolescents between the ages of 11 and 16. Adolescents’ subjective, physiological and behavioural emotion responses were assessed via self-report (PANAS-C; Laurent et al., 1999), heart rate monitoring and persistence on the task respectively, and associated with their self-reported emotion regulation difficulties (DERS-SF, Gullone & Taffe, 2012) as well as strategy use during the task (ERQ-state; Egloff et al., 2006). Both tasks were found to be subjectively frustrating, as evidenced by significant differences between pre- and post- reported negative affect. Beyond the similar self-reported psychological distress for both tasks, stronger negative physiological and behavioural reactions were however found for the BIRD task with higher heart rates as well as a tendency towards a shorter persistence on this task. The emotional responses were found to be correlated with adolescents reported difficulties, above all with their reported impulsiveness. Adolescents’ strategy use of reappraisal and suppression did not differ between tasks. Due to the similar self-reported negative affect after both tasks, these findings validate the use of both tasks in an adolescent population. In addition, they highlight potential differences between tasks in terms of emotion responses. These discrepancies should be taken into account in further studies due to their implications for the interpretation of findings. [less ▲]

Detailed reference viewed: 18 (4 UL)
See detailSystems ecology of the human microbiome
Wilmes, Paul UL

Scientific Conference (2018, November)

Detailed reference viewed: 8 (0 UL)
See detailPolicy and research priorities of the World Young Leaders in Dementia (WYLD) network
Leist, Anja UL

Scientific Conference (2018, October 30)

Detailed reference viewed: 20 (0 UL)
See detailMicromagnetic simulations for understanding magnetic SANS
Michels, Andreas UL

Scientific Conference (2018, October 29)

Detailed reference viewed: 12 (0 UL)
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See detailTwitter data as primary sources for historians: a critical approach
Clavert, Frédéric UL; Papastamkou, Sofia

Scientific Conference (2018, October 25)

Detailed reference viewed: 45 (3 UL)
See detailDoing Digital Hermeneutics in an Interdisciplinary Setting
van der Heijden, Tim UL

Scientific Conference (2018, October 25)

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

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

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

Scientific Conference (2018, October 18)

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

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

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

Scientific Conference (2018, October 18)

Detailed reference viewed: 26 (7 UL)
See detailTechnology’s Storytellers reloaded A text-mining experiment in history of technology
Lucchesi, Anita UL; Fickers, Andreas UL

Scientific Conference (2018, October 12)

Detailed reference viewed: 14 (1 UL)
See detailEntwicklung der zweiten Generation des Eurocodes 4 - Neuerungen in der Bemessung für Verbundtragwerke aus Stahl und Beton
Schäfer, Markus UL; Mensinger, Martin

Scientific Conference (2018, October 11)

Detailed reference viewed: 13 (0 UL)
See detailDoes Born-Digital Heritage turn Historians into Digital Historians?
Schafer, Valerie UL

Scientific Conference (2018, October 10)

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

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

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

Scientific Conference (2018, October 10)

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

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

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

Scientific Conference (2018, October 09)

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

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

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

Scientific Conference (2018, October 05)

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

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

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

Scientific Conference (2018, October)

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

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

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See detailThe ecology of the unseen
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailStatic load deflection experiment on a beam for damage detection using the Deformation Area Difference Method
Erdenebat, Dolgion UL; Waldmann, Danièle UL; Teferle, Felix Norman UL

Scientific Conference (2018, October)

A reliable and safety infrastructure for both transport and traffic is becoming increasingly important today. The condition assessment of bridges remains difficult and new methods must be found to provide ... [more ▼]

A reliable and safety infrastructure for both transport and traffic is becoming increasingly important today. The condition assessment of bridges remains difficult and new methods must be found to provide reliable information. A meaningful in-situ assessment of bridges requires very detailed investigations which cannot be guaranteed by commonly used methods. It is known that the structural response to external loading is influenced by local damages. However, the detection of local damage depends on many factors such as environmental effects (e.g. temperature), construction layer (e.g. asphalt) and accuracy of the structural response measurement. Within the paper, a new so-called Deformation Area Difference (DAD) Method is presented. The DAD method is based on a load deflection experiment and does not require a reference measurement of initial condition. Therefore, the DAD method can be applied on existing bridges. Moreover, the DAD method uses the most modern technologies such as high precision measurement techniques and attempts to combine digital photogrammetry with drone applications. The DAD method uses information given in the curvature course from a theoretical model of the structure and compares it to real measurements. The paper shows results from a laboratory load-deflection experiment with a steel beam which has been gradually damaged at distinct positions. The load size is chosen so that the maximum deflection does not exceed the serviceability limit state. With the data obtained by the laboratory experiment, the damage degree, which can still be detected by the DAD method, is described. Furthermore, the influence of measurement accuracy on damage detection is discussed. [less ▲]

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See detailHardware Demonstration of Precoded Communications in Multi-Beam UHTS Systems
Merlano Duncan, Juan Carlos UL; Krivochiza, Jevgenij UL; Andrenacci, Stefano UL et al

Scientific Conference (2018, October)

In this paper, we present a hardware test-bed to demonstrate closed-loop precoded communications for interference mitigation in the forward link of the multi-beam ultra-high throughput satellite systems ... [more ▼]

In this paper, we present a hardware test-bed to demonstrate closed-loop precoded communications for interference mitigation in the forward link of the multi-beam ultra-high throughput satellite systems. The hardware demonstrator is a full-chain closed-loop communication system with a multi-beam DVB-S2X compliant gateway, a satellite payload and MIMO channel emulator and a set of DVB-S2X user terminals with real-time CSI estimation and feedback. We experimentally show the feasibility of Precoding implementation in satellite communications based on the superframe structure DVB-S2X standard. Using the test-bed we have a possibility to run real-time precoded DVB-S2X communication and benchmark its performance under realistic environment. The hardware demonstrator is suitable to perform realistic benchmarks of Block- and Symbol-level Precoding techniques for multicast and unicast user scheduling scenarios. [less ▲]

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See detailLe microbiote humain et son impacte sur la santé
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailUnderstanding the role of the microbiome in Parkinson’s disease
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailDie Zeit der Pfandherrschaften (1388-1437). Luxemburg unter fremder Herrschaft?
Dönges, Christa Annette UL

Scientific Conference (2018, September 28)

Detailed reference viewed: 36 (1 UL)
Peer Reviewed
See detailDie Erfindung der Grenze. Zur Konstruktion von Herrschaftsgebieten auf Regionalkarten des 16. Jahrhunderts im Westen des Reiches.
Uhrmacher, Martin UL

Scientific Conference (2018, September 28)

Im Spätmittelalter war das Reich durch Prozesse der Territorialisierung geprägt. Vor allem in den größeren Landesherrschaften wurde versucht, der Zersplitterung von Rechten und Besitzungen ... [more ▼]

Im Spätmittelalter war das Reich durch Prozesse der Territorialisierung geprägt. Vor allem in den größeren Landesherrschaften wurde versucht, der Zersplitterung von Rechten und Besitzungen entgegenzuwirken und Herrschaft zu verdichten. Im Westen des Reiches blieb man jedoch auf dem Weg zum Territorialstaat zumeist noch weit von einer flächigen Durchsetzung von Herrschaft entfernt. Die territorialen Verhältnisse lassen sich häufig als Gemengelage aus sich überlagernden Herrschaftsrechten, Hochgerichtsbezirken, Gemeinherrschaften, umstrittenen Gebieten oder anderen Abhängigkeiten beschreiben. Eine kartographische Erfassung dieser komplexen und mehrdimensionalen räumlichen Strukturen war mit den Mitteln der damaligen Zeit nicht möglich. Der Aufschwung einer zunehmend wissenschaftlich geprägten Kartographie ab der Mitte des 15. Jahrhunderts erlaubte es den Landesherren, kartographischer Darstellungen als Instrumente von Macht und Herrschaft zu nutzen: einerseits als Grundlage für die politische und wirtschaftliche Entwicklung des Territoriums, andererseits als Medium zur Verbreitung territorialer Ansprüche und zur Inszenierung von Herrschaft. Aus diesem Grund wurden einige der bekanntesten zeitgenössischen Kartographen mit der räumlichen Darstellung einzelner Fürstentümer beauftragt, bspw. Martin Waldseemüller durch Herzog René II. von Lothringen. Diese Aufgaben stellten die Kartographen vor große Probleme, denn noch gab es keine geeigneten Mittel, mit denen die politischen und territorialen Verhältnisse im Kartenbild auch nur annähernd widergegeben werden konnten. Eine Analyse ausgewählter Karten zeigt, welche verschiedenen Strategien angewandt wurden, um den fragmentarischen Besitz der Auftraggeber in seiner Gesamtheit als geschlossenes Herrschaftsgebiet erst zu konstruieren. Diese Experimentierphase endete Mitte des 16. Jahrhunderts mit der Etablierung von Grenzen in Form von Linien als allgemein gültiger Konvention, obwohl Territorialgrenzen im Sinne einer umfassenden Scheidelinie zwischen zwei Territorien in dieser Zeit nicht existierten. Der Vortrag widmet sich einer Fragestellung, die in Folge des spatial turn zwar wieder verstärkt in den geschichtswissenschaftlichen Fokus gelangte, aber in vieler Hinsicht noch nicht gründlich genug aufgearbeitet ist. Es gilt, historische Karten als vielschichtige, Schrift und Bild vereinende Wissensträger verstärkt auf Ihre Funktion bei der Ausbildung von politischen Räumen und Einheiten in den Blick zu nehmen. Denn sie müssen stets als bewusste Konstruktionen und keinesfalls als Versuch eines - gemessen an den jeweiligen technischen Möglichkeiten - quasi photographischen Abbildes der Realität verstanden und interpretiert werden. Die mit den Karten vermittelten und durch deren Druck auch weit verbreiteten Inszenierungen von geschlossenen Territorialstaaten erwiesen sich zudem als sehr wirkmächtig und prägend, teilweise bis zum Ende des Alten Reiches. Den zugrundeliegenden Strukturen und Prozessen wird im Rahmen des Vortrags besondere Aufmerksamkeit geschenkt. [less ▲]

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See detailMultilingualism in forced migration research: insights from an ethnographic study in Luxembourg
Kalocsanyiova, Erika UL

Scientific Conference (2018, September 27)

This paper outlines some methodological considerations for researching integration trajectories in multilingual societies. It draws on a linguistic ethnographic study undertaken in Luxembourg. It ... [more ▼]

This paper outlines some methodological considerations for researching integration trajectories in multilingual societies. It draws on a linguistic ethnographic study undertaken in Luxembourg. It discusses ways of accommodating the participants’ (and my own) multilingual but distinct language competences. I reflect upon how my positionality as a multilingual researcher became part of the research process, shaping both the research design and the relationships I had with the informants. Multilingual research practices can play a fundamental role in empowering participants and privileging their voices in migration-related studies. This paper outlines some of the benefits/complexities that can arise if both participants and researchers draw on their old and newly acquired language resources. In this connection, I will argue that narrative analysis allows a refined understanding of foreign- and cross-language exchanges, which in turn helps to uncover the many ways in which linguistic integration can be understood, practiced and experienced. Narratives also proved to be an excellent tool for exploring multiple and shifting ideological stances in (meta)discourses surrounding language, identity and societal participation in the context of this research. [less ▲]

Detailed reference viewed: 27 (1 UL)
See detailRadial urban forms in Europe
Caruso, Geoffrey UL

Scientific Conference (2018, September 27)

Detailed reference viewed: 22 (1 UL)
See detailMagnetic neutron scattering on nanomagnets
Michels, Andreas UL

Scientific Conference (2018, September 26)

Detailed reference viewed: 8 (1 UL)
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See detailSOFTENING AND MELTING MODELING OF IRON ORE PARTICLES USING A CFD-DEM COUPLING METHOD
Baniasadi, Mehdi UL; Peters, Bernhard UL

Scientific Conference (2018, September 25)

The iron-bearing particles start softening and melting because of the weight of burden above and the high temperature in the middle of the blast furnace so-called cohesive zone. In this region, as ... [more ▼]

The iron-bearing particles start softening and melting because of the weight of burden above and the high temperature in the middle of the blast furnace so-called cohesive zone. In this region, as particles are softened, the void space between particles decreases. As the temperature increases further, the softened particles start melting and generate two different liquids: molten iron and slag. Then the generated liquids trickle down to the lower part of the blast furnace. The softening and melting process forms the impermeable ferrous layers forcing gas to flow horizontally through the permeable coke windows. These phenomena have a big effect on the operation of the blast furnace, and since it is not possible to interrupt the blast furnace to investigate details of the phenomena occurring inside, the numerical simulation becomes more practical. In this contribution, the eXtended Discrete Element Method (XDEM) as an advanced numerical tool based on the discrete-continuous framework, is used. Within this model, the gas and liquid phases are described by computational fluid dynamics (CFD) and the soft-sphere discrete element approach (DEM) is used for the coke and iron ore particles. Continuous phases are coupled to the discrete entities through mass, momentum, and energy exchange. Moreover, the internal temperature distribution of the particles is described. The particle’s deformation, temperature, melting, and shrinking along with the saturation of molten iron and slag are examined using the XDEM method. [less ▲]

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See detailTell Your Town – Sprache lernen, Integration fördern, Städte erkunden und entdecken
Reuter, Bob UL; Haberkorn, Marcus

Scientific Conference (2018, September 20)

Wie können ansässige und neu zugezogene Schülerinnen und Schülern in Rheinland-Pfalz und Luxemburg besser in ihren Regionen integriert werden, dabei ihre sprachlichen Fähigkeiten entwickeln und die ... [more ▼]

Wie können ansässige und neu zugezogene Schülerinnen und Schülern in Rheinland-Pfalz und Luxemburg besser in ihren Regionen integriert werden, dabei ihre sprachlichen Fähigkeiten entwickeln und die erforderliche Medienkompetenz erlernen? Diesen Fragen hat sich ein grenzüberschreitendes bilaterales Entwicklungs- und Forschungsprojekt gewidmet, wobei ein „Partizipativer Design“ Ansatz (Danielsson & Wiberg, 2006) angewandt wurde. Unter der Leitung eines Teams der Hochschule Trier wurde in Zusammenarbeit mit SchülerInnen und LehrerInnen der Escher Brill Schule und der Trierer Kurfürst-Balduin-Realschule sowie einem Team der Universität Luxemburg, während des Schuljahres 2016/2017, die mobile App „Tell Your Town" entwickelt. Ziel war es erfundene Geschichten an echten Schauplätzen in Trier und Esch auf Deutsch, Französisch, Englisch und Luxemburgisch in spielerischer Form zu erzählen. Die Geschichten, Schauplätze und Routen wurden in Design Workshops partizipativ erarbeitet. Ein Team an der Hochschule Trier setzte die App anschließend um und ein Team der Universität Luxemburg dokumentierte, analysierte und evaluierte die Benutzung der App durch die SchülerInnen in Feldversuchen in Trier und in Esch, mit Hilfe teilnehmender Beobachtungen, Videographie und Befragungen von SchülerInnen und LehrerInnen, um technische und pädagogische Rückmeldungen an die EntwicklerInnen und LehrerInnen zu geben. Bei diesem Projekt ist eine frei verfügbare App entstanden, welche die Benutzer dazu einlädt eine der beiden Städte „per pedes“ zu entdecken und dabei noch so einiges über die Geschichte der Stadt zu erfahren, was ihnen durch einen fiktionalen Reiseführer in interaktiven Dialogen vermittelt wird. Dabei wird die Geolokalisierungsfunktion des Smartphones genutzt um den Benutzer zu bedeutsamen Sehenswürdigkeiten zu führen, wo dann interaktive Minispiele oder Dialoge mit dem fiktionalen Reiseführer erfolgen. In der Route Esch steht die Geschichte des Luxemburgischen Bergbaus und den dortigen Minenarbeitern im Mittelpunkt. Die Route Trier handelt von einem Wettlauf zwischen Karl Marx und Nero. In diesem wird der Spieler von Karl Marx begleitet und lernt so bekannte Orte aus Trier kennen. Mit Hilfe der Feldversuche wurde sichtbar, dass die App großes Potential hat, um eine relativ autonome Erkundung der Städte zu initiieren und es auch den einheimischen SchülerInnen erlaubt, ihre Stadt mit neuen Augen bewusster wahrzunehmen. [less ▲]

Detailed reference viewed: 35 (1 UL)