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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 detailJoint Scheduling and Precoding for Frame-Based Multigroup Multicasting in Satellite Communications
Bandi, Ashok UL; Shankar, Bhavani UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, December 09)

Recent satellite standards enforce the coding of multiple users’ data in a frame. This transmission strategy mimics the well-known physical layer multigroup multicasting (MGMC). However, typical beam ... [more ▼]

Recent satellite standards enforce the coding of multiple users’ data in a frame. This transmission strategy mimics the well-known physical layer multigroup multicasting (MGMC). However, typical beam coverage with a large number of users and limited frame length lead to the scheduling of only a few users. Moreover, in emerging aggressive frequency reuse systems, scheduling is coupled with precoding. This is addressed in this work, through the joint design of scheduling and precoding for frame-based MGMC satellite systems. This aim is formulated as the maximization of the sum-rate under per beam power constraint and minimum SINR requirement of scheduled users. Further, a framework is proposed to transform the non-smooth SR objective with integer scheduling and nonconvex SINR constraints as a difference-of-convex problem that facilitates the joint update of scheduling and precoding. Therein, an efficient convex-concave procedure based algorithm is proposed. Finally, the gains (up to 50%) obtained by the jointed design over state-of-the-art methods is shown through Monte-Carlo simulations. [less ▲]

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See detailSoftware Engineering for Dataset Augmentation using Generative Adversarial Networks
Jahic, Benjamin UL; Guelfi, Nicolas UL; Ries, Benoît UL

Scientific Conference (2019, October 19)

Software engineers require a large amount of data for building neural network-based software systems. The engineering of these data is often neglected, though, it is a critical and time-consuming activity ... [more ▼]

Software engineers require a large amount of data for building neural network-based software systems. The engineering of these data is often neglected, though, it is a critical and time-consuming activity. In this work, we present a novel software engineering approach for dataset augmentation using neural networks. We propose a rigorous process for generating synthetic data to improve the training of neural networks. Also, we demonstrate our approach to successfully improve the recognition of handwritten digits using conditional generative adversarial networks (cGAN). Finally, we shortly discuss selected important issues of our process, presenting related work and proposing some improvements. [less ▲]

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See detailMonitoring du système scolaire – Le modèle luxembourgeois (invited talk)
Fischbach, Antoine UL

Scientific Conference (2019, October 17)

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See detailP3LS : Plausible Deniability for Practical Privacy-Preserving Live Streaming
Decouchant, Jérémie UL; Boutet, Antoine; Yu, Jiangshan et al

Scientific Conference (2019, October)

Video consumption is one of the most popular Internet activities worldwide. The emergence of sharing videos directly recorded with smartphones raises important privacy concerns. In this paper we propose ... [more ▼]

Video consumption is one of the most popular Internet activities worldwide. The emergence of sharing videos directly recorded with smartphones raises important privacy concerns. In this paper we propose P3LS , the first practical privacy-preserving peer-to-peer live streaming system. To protect the privacy of its users, P3LS relies on k-anonymity when users subscribe to streams, and on plausible deniability for the dissemination of video streams. Specifically, plausible deniability during the dissemination phase ensures that an adversary is never able to distinguish a user’s stream of interest from the fake streams from a statistical analysis (i.e., using an analysis of variance). We exhaustively evaluate P3LS and show that adversaries are not able to identify the real stream of a user with very high confidence. Moreover, P3LS consumes 30% less bandwidth than the standard k-anonymity approach where nodes fully contribute to the dissemination of k streams. [less ▲]

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See detailWireless Multi-group Multicast Precoding with Selective RF Energy Harvesting
Gautam, Sumit UL; Lagunas, Eva UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, September 05)

We present a novel framework for multi-group multicast precoding in the presence of three types of wireless users which are distributed among various multicast groups. A multi-antenna transmitter conveys ... [more ▼]

We present a novel framework for multi-group multicast precoding in the presence of three types of wireless users which are distributed among various multicast groups. A multi-antenna transmitter conveys information and/or energy to the groups of corresponding receivers using more than one multicast streams. The information specific users have conventional receiver architectures to process data, energy harvesting users collect energy using the non-linear energy harvesting module and each of the joint information decoding and energy harvesting capable user is assumed to employ the separated architecture with disparate non-linear energy harvesting and conventional information decoding units. In this context, we formulate and analyze the problem of total transmit power minimization for optimal precoder design subjected to minimum signal-to-interference-and-noise ratio and harvested energy demands at the respective users under three different scenarios. This problem is solved via semi-definite relaxation and the advantages of employing separate information and energy precoders are shown over joint and per-user information and energy precoder designs. Simulation results illustrate the benefits of proposed framework under several operating conditions and parameter values. [less ▲]

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See detailValue-added models: To what extent do estimates of school effectiveness depend on the selection of covariates?
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, September)

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See detailFear and Euphoria
Lehnert, Thorsten UL

Scientific Conference (2019, August 28)

Detailed reference viewed: 57 (3 UL)
See detailDimensional Comparison Effects on Facets of Subject-Specific Anxieties: A Nested Modelling Approach
Talic, Irma UL; Sparfeldt, Jörn; Möller, Jens et al

Scientific Conference (2019, August 16)

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See detailImplementing intelligence facets as predictors into the generalised I/E model
Hausen, Jennifer UL; Möller, Jens; Greiff, Samuel UL et al

Scientific Conference (2019, August 13)

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent ... [more ▼]

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent extension as the generalized I/E model allows further domains than math and verbal achievement. However, intelligence facets as an indicator of achievement have been neglected within the GI/E model framework. Therefore, the purpose of this research is to explore the influences of three intelligence facets (verbal, numerical, figural) on domain-specific ASCs beyond grades and achievement scores. We drew on N=382 German students to analyze verbal, numerical, and figural intelligence, German and math achievement, self-reported grades and ASCs in four domains. We performed a structural equation model using Mplus with grades, achievement scores and intelligence facets specified as predictors and domain-specific ASCs as criteria. Positive paths were found from math, physics, German and English grade to their corresponding self-concepts. A positive path was found between physics grade and math ASC while negative paths were found from English grade to math and physics ASC and from math grade to German, physics and English ASC. The path coefficients from math achievement to math ASC as well as to physics ASC were positive; German achievement was negatively related to math ASC. Lastly, numerical intelligence was positively related to physics ASC, and verbal intelligence was positively related to English ASC. Thus, intelligence, specifically numerical and verbal intelligence, seem to be valid predictors of domain-specific ACSs beyond grades and achievement test scores. [less ▲]

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See detailThe Long 19th Century of Music in Luxembourg. Music History, Sociology and Ethnology
Sagrillo, Damien UL

Scientific Conference (2019, August 09)

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is ... [more ▼]

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is concerned, national music research. A first point of view is music ethnology: citizens, nations have their songs and pass them on orally across national and linguistic borders and over generations. Folksongs originate from the music of the people, and patriotic music in Luxembourg is often music based on folksong styles. A further aspect of music in Luxembourg is that art music originated since the independence of the Grand Duchy in the 19th century. Sociological considerations deal with community music in Luxembourg. The starting point is a more liberal constitution, which for the first time offered citizens the right of assembly. Finally, my lecture will offer some insights of musical activities of people who left their homeland. [less ▲]

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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 detailPresent-Day Land and Sea Level Changes around South Georgia Island: Results from Precise Levelling, GNSS, Tide Gauge and Satellite Altimetry Measurements
Teferle, Felix Norman UL; Dalziel, I W D; Hunegnaw, Addisu UL et al

Scientific Conference (2019, July 25)

South Georgia Island, the main land outcrop on the South Georgia microcontinent (SGM), is located approximately 1,400 km east of the Falkland Islands and approximately 1,400 km northeast of the ... [more ▼]

South Georgia Island, the main land outcrop on the South Georgia microcontinent (SGM), is located approximately 1,400 km east of the Falkland Islands and approximately 1,400 km northeast of the northernmost tip of the Antarctic peninsular. The SGM is believed to lie south of the North Scotia Ridge (NSR), which forms the boundary to the South America Plate, while to the south it is bordered by the Scotia Plate (SP). In its sub-Antarctic location, the island is largely covered by mountain glaciers which have been reported to be retreating due to climatic change. Furthermore, during past glaciation periods the island and its shelf area, stretching much of the SGM, have been ice covered as was revealed by scarring of the sub-oceanic topography. Together with ongoing tectonics along the NSR and recent seismicity at the SP boundary, these processes have the ability to produce significant uplift on local to regional scales. With its mid-ocean location in the Southern Atlantic Ocean South Georgia Island is in a key position for the oceanic and geodetic global monitoring networks. As these net-works suffer from a Hemisphere imbalance with the number of stations in the Northern Hemisphere outnumbering those in the Southern Hemisphere, operating these stations to the highest standards is of key scientific value. It is of particular interest to monitor the tide gauge (GLOSS ID 187) at King Edward Point (KEP) for vertical land movements to establish a continuous record of its datum within the Permanent Service for Mean Sea Level (PSMSL), which in turn makes it useful for long-term sea level studies and satellite altimetry calibrations. With the establishment of five GNSS stations on the islands by teams from Luxembourg, the UK and the USA during 2013 to 2015, and the scientific analysis of these data within a global network of stations, it has now become possible to study present-day vertical land movements and their impacts. Furthermore, together with four precise levelling campaigns of the KEP benchmark network in 2013, 2014 and two in 2017, it has also been possible to investigate the very local character of the vertical motions near KEP, i.e. the stability of the jetty upon which the tide gauge is mounted. In this study, we will present the still preliminary results from the GNSS and levelling measurements and will discuss their impact on the sea level record from the KEP tide gauge. Our measurements show that while South Georgia Island and the area around KEP are rising, the jetty and tide gauge are subsiding, leading to a lower magnitude of the observed sea level change than expected from satellite altimetry. In order to improve the agreement between these measurements both local and regional vertical land movements need to be monitored. [less ▲]

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See detailBracketing in student writing: its uses (and abuses)
Deroey, Katrien UL

Scientific Conference (2019, July 23)

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related ... [more ▼]

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related to important text construction issues such as information packaging, coherence, clarity, conciseness, intertextual framing and sourcing. With a view to informing academic writing description and instruction, we examined the relationship between bracketed text and its cotext in a wide variety of disciplines and assignment genres. The relationships are described using an adaptation of Halliday and Matthiessen’s (2014) logico-semantic framework of clausal relationships. To better understand and teach the use of this information packaging feature, we studied the relationship between bracketed text and its cotext in the British Academic Written English (BAWE) corpus of high-graded student assignments. Using Sketch Engine and corpus query language, we extracted a random sample of 2000 instances of bracketing in running text only. This subcorpus is composed of 500 instances from each of the four main disciplinary groupings (Arts and Humanities, Life Sciences, Physical Sciences, Social Sciences) and contains instances from most of the BAWE assignment genres. The concordances were imported into a database table in FileMaker Pro. This database programme facilitates coding by limiting choices depending on previous selections and thus guiding the coder through the analytical steps. For the analysis of the data, it offers flexibility for grouping records and aggregating results on different levels. The logico-semantic framework used in systemic functional linguistics to classify the relationships between clauses (Halliday & Matthiessen, 2014) served as our starting point to classify the relationships between bracketed text and cotext. This framework distinguishes two fundamental logico-semantic relationships: expansion, which ‘relates phenomena as being of the same order of experience’, and projection, which ‘relates phenomena of one order of experience (the processes of saying and thinking) to phenomena of a higher order (semiotic phenomena – what people say and think)’ (p. 443). The latter contains three subtypes: elaboration (‘one clause elaborates on the meaning of another by further specifying or describing it’) (p. 461), enhancement (‘one clause (or subcomplex) enhances the meaning of another by qualifying it) (p. 476) and extension (‘one clause extends the meaning of another by adding something new to it’) (p. 471). This framework was refined and expanded through several stages of interrating and discussion in order to reflect our findings. We first analysed a random sample of 1000 instances from the whole BAWE corpus. With the resulting adapted classificatory framework we next independently analysed a quarter of our subcorpus of 2000 concordances. This led to further refinement of the framework and classificatory criteria. Finally, we each analyzed a different set of concordances from the disciplinary groupings. Disciplinary informants were consulted where needed. Our analysis revealed four major logico-semantic relationships between the bracketed text and cotext: in addition to Halliday & Matthiessen’s (2014) projection (1) and expansion (elaboration (2), enhancement (3, 4), extension (5)), we identified bracketed text functioning as intratextual reference (6) and code (7). The few instances that could not be confidently classified were assigned to a ‘hard to classify’ category. (1) However the anticipated number of children per woman in Europe and the USA is still near or above two (Bongaarts, 1999), showing that many are still having children. (2) Many of these injures are healed fractures and breaks occurring around the torso (upper body). (3) It is dated to the reign of Nectanebo II (360-343 BC). (4) Acetanilide (4.78g, 35.4 mmol) was dissolved in cold, glacial acetic acid (25ml, 437.1 mmol) (5) Parmenides decision to include a cosmology that he has already (apparently) proved to be flawed is an interesting one to say the least. (6) This is called circular polarization (figure 5) and is the natural state of white light. (7) Stronger field ligands such as (PPh 3) and (NCS) increase the splitting. Projection was –perhaps not surprisingly- the most common relationship by far, although markedly less frequent in the Physical Sciences. Expansion was mainly achieved through elaboration, with restatements (2) and abbreviations predominating. Enhancement relationships were mostly temporal locations (3) or measurements (4). Extension was relatively rare (5). Intratextual references (6) took various forms, such as figures, appendices, equations, and line numbers for quoted text. Bracketed code was a marked feature of the Physical Sciences, occurring in formulae and enclosing symbols or abbreviations (7). Overall, students’ use of bracketed text appeared to reflect disciplinary conventions and reflected the genre goals of assignments by demonstrating knowledge, understanding and appropriate source use. Contrary to expectations, instances where the bracketed text seemed superfluous or adversely affected coherence were rare. We conclude by discussing what these findings mean for academic writing instruction. Reference Halliday, M. A. K., & Matthiessen, C. M. I. M. (2014). Halliday's introduction to functional grammar (4 ed.). Abingdon: Routledge. [less ▲]

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See detailWind music and scholarship. IGEB and WASBE
Sagrillo, Damien UL

Scientific Conference (2019, July 13)

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See detailRecent Activities on Tristan da Cunha Island: Geodetic Installations, Local Tie Measurements and their Analysis
Teferle, Felix Norman UL; Hunegnaw, Addisu UL; Backes, Dietmar UL et al

Scientific Conference (2019, July 11)

During 2017 a team from the University of Luxembourg and the National Oceanography Centre, Liverpool, established a permanent Global Navigation Satellite System (GNSS) station and two new tide gauges on ... [more ▼]

During 2017 a team from the University of Luxembourg and the National Oceanography Centre, Liverpool, established a permanent Global Navigation Satellite System (GNSS) station and two new tide gauges on Tristan da Cunha Island in the South Atlantic Ocean. These installations were funded through various projects at both collaborating institutions under the umbrella of the International GNSS Service (IGS) Tide Gauge Benchmark Monitoring (TIGA) Working Group and the Global Geodetic Observing System (GGOS) focus area on Sea Level Change, Variability and Forecasting. While this was the first scientific installation of a GNSS station on the main island within the Tristan da Cunha archipelago, IGS station GOUG, located on Gough Island which lies 412 km to the south, has been in operation since 1998. Unfortunately GOUG was decommissioned in 2018. Sea level observations on Tristan da Cunha have a longer history than GNSS with various tide gauges having been in operation since 1984. Tristan da Cunha also hosts a Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) station which was established in 2012 after a previous installation was upgraded and moved to the current site. The antenna TCTA is located on the concrete monument of the previous DORIS antenna. Furthermore, in order for future International Terrestrial Reference Frame (ITRF) computations to fully benefit from the proximity of the sensors, the geodetic ties between the respective antennas (and reference markers in case of the tide gauges) need to be determined at the millimeter level using various terrestrial surveying methods and a local benchmark network. This contribution provides details of the activities on Tristan da Cunha including the installations, the established benchmark network, the terrestrial surveys of the geodetic ties and the analysis of these measurements in order to geometrically link the GNSS and DORIS antennas to each other as well as to the tide gauges. [less ▲]

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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

Scientific Conference (2019, July 09)

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See detailNamenskunde – Gender(re)konstruktionen in Autobiographien von Transpersonen
Artuso, Sandy Kathy UL

Scientific Conference (2019, July 05)

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See detailTranslanguaging as a pedagogy, a practice or a strategy? Examples from a preschool and a primary school class in Luxembourg
Kirsch, Claudine UL; Degano, Sarah UL; Mortini, Simone UL

Scientific Conference (2019, July 01)

The concept of translanguaging has been continuously redefined in education, psycholinguistics and sociolinguistics, which has led to some loss of meaning. Regarding teacher translanguaging, studies show ... [more ▼]

The concept of translanguaging has been continuously redefined in education, psycholinguistics and sociolinguistics, which has led to some loss of meaning. Regarding teacher translanguaging, studies show that it has been used as a strategy to further comprehension and learning, and as a pedagogy. The latter recognizes the existence of multiple languages in class and leverages the students’ semiotic system to make meaning and learn (García et al. 2017). Translanguaging has thereby been understood either as a resource-oriented pedagogy that challenges traditional conceptualizations of bilingualism and language learning, or as a pedagogy that fights social inequalities. Most research studies adopt the first view (Poza, 2017). The present paper combines two longitudinal doctoral studies and investigates the ways in which a preschool and a primary school teacher use translanguaging in their classes in Luxembourg. Drawing on interviews and observations, the findings show that the preschool teacher implemented a translanguaging pedagogy. She planned for the use of several languages, opened translanguaging spaces, and systematically translanguaged where she believed it would support learning (Kirsch et al. submitted). By contrast, the primary school teacher used translanguaging as a pedagogical strategy. She used the curricular languages and only translanguaged to support particular students. These differences are explained by the curriculum and the preschool teacher’s attendance of a professional development course. The findings contribute to our understanding of possible ways of implementing translanguaging as a pedagogy. [less ▲]

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See detailTranslanguaging Course for Teachers
Aleksic, Gabrijela UL; Bebic-Crestany, Dzoen

Scientific Conference (2019, July 01)

Amongst the many terms to describe the natural linguistic experiences of bilinguals, translanguaging is standing out as the socio-linguistic theory that consciously recognises a unitary linguistic ... [more ▼]

Amongst the many terms to describe the natural linguistic experiences of bilinguals, translanguaging is standing out as the socio-linguistic theory that consciously recognises a unitary linguistic repertoire of bilinguals. Translanguaging is used without regards to boundaries imposed by socio-politically constructed named languages and the unnatural differentiation of various forms of communication. The extensive research of many scholars, most notably by Li Wei and Ofelia García, confronts the social and educational suppression of minorities’ languages and cultures in schools. Their analyses and proposed solutions for social justice, therefore, serve as the theoretical and pedagogical basis of our research in Luxembourg’s multilingual education. The understanding that bilinguals translanguage naturally in conversation and for sense- and meaning-making purposes has also been shown in Luxembourg: 64% of four-year olds in Luxembourg do not speak Luxembourgish and translanguaging happens naturally. Research also shows that students of minority groups generally underperform at school. The implementation of translanguaging in Luxembourg’s multilingual education would therefore enable a better development of school and home language, metalinguistic awareness, linguistic tolerance, socio-emotional development and multilingual identity. To address the challenges of multilingual education in Luxembourg, we firstly offer a professional development (PD) course that aims to help teachers take a translanguaging stance, vital for its success. Secondly, we adapt the general translanguaging pedagogical methodology to incorporate home languages in teachers’ daily classroom activities. Our project has been supported by the Luxembourg National Research Fund* to deliver 8 sessions from the Translanguaging guide developed at the City University of New York. Given the local multilingual context, introducing translanguaging and adapting the guide is a challenge for us as researchers. We will use quantitative and qualitative methods to assess the success of the PD and better understand translanguaging as a theory, practice and pedagogy. [less ▲]

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See detailA DEM approach for modeling biomass fast pyrolysis in a double auger reactor
Qi, Fenglei UL

Scientific Conference (2019, July)

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to ... [more ▼]

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to predict the biomass fast pyrolysis process in a double auger reactor, which is described as a reacting granular flow. The thermodynamic state of each particle is properly predicted with an addition of a heat transfer model and a reaction model on top of the traditional DEM method. The results suggest that the predictions of the thermochemical decomposition kinetics of biomass components are consistent with the experimental observations. The results also indicate that the fast pyrolysis in the reactor is controlled by the heat transfer process. Any operating condition variation in favor of enhancing heat transfer is beneficial to the fast pyrolysis process and vice versa. [less ▲]

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See detailExpansion nach Belgien als Verwaltungstätigkeit: der Kölner Beamte Franz Thedieck im NS
Brüll, Christoph UL

Scientific Conference (2019, June 28)

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See detailN point Virasoro algebras are multi-point Krichever Novikov type algebras
Schlichenmaier, Martin UL

Scientific Conference (2019, June 28)

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See detailForced migrants in Luxembourg: an LE approach to linguistic integration
Kalocsanyiova, Erika UL

Scientific Conference (2019, June 28)

This paper outlines the core contributions that a linguistic ethnography (LE) approach can make to forced migration and integration research. LE provides multiple tools for capturing the complexity and ... [more ▼]

This paper outlines the core contributions that a linguistic ethnography (LE) approach can make to forced migration and integration research. LE provides multiple tools for capturing the complexity and transient character of the real social environments in which forced migrants integrate. After summarising the main arguments of the literature which examines the language–displacement nexus, this contribution moves on to discuss the nature and focus of the proposed approach. It then turns to specific examples from a two-year LE research project that addressed the impact of multilingualism on forced migrants’ trajectories in Luxembourg. [less ▲]

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See detailOn the single-peakedness property
Devillet, Jimmy UL

Scientific Conference (2019, June 28)

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See detailOpening Remarks / Chair / Program Chair
Schafer, Valerie UL

Scientific Conference (2019, June 27)

Decoding Europe. Technological Pasts in the Digital Age. The conference will study – in an interdisciplinary way – the impact of digitisation on historical developments and the consequences of the digital ... [more ▼]

Decoding Europe. Technological Pasts in the Digital Age. The conference will study – in an interdisciplinary way – the impact of digitisation on historical developments and the consequences of the digital turn on the writing and shaping of European history. The Tensions of Europe (ToE) conference is organised biennially. ToE is an interdisciplinary community of scholars who study the shaping of Europe by paying attention to the role of technology and material culture. It welcomes fruitful interaction between historians of technology and scholars who study technology from all other fields of the humanities and the social sciences. [less ▲]

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See detailLaser polishing of Aluminum and Polyamide for dissimilar laser welded assemblies
Amne Elahi, Mahdi UL; Koch, Marcus; Plapper, Peter UL

Scientific Conference (2019, June 27)

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See detailLaser overlap joining from copper to aluminum and analysis of failure zone
Mathivanan, Karthik UL; Plapper, Peter UL

Scientific Conference (2019, June 26)

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of ... [more ▼]

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of copper. However, in dissimilar material interaction the resulting intermetallic (IMC) phases are brittle, which result in reduced performance.This paper analyses the joint with laser beam irradiated from the copper side (Cu on top). The idea is to distribute the intermetallic compounds inside the joint to obtain a ductile behavior. The zones of failure and the distribution of the intermetallic phase is studied. The microstructural analysis of the fusion zone and mechanical strength of the joint are presented. [less ▲]

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See detailRécits visuels de la Grande Guerre au Luxembourg : cent ans de manuels d'histoire
Camarda, Sandra UL; Scuto, Denis UL

Scientific Conference (2019, June 26)

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See detailHistory of networks: evolution, issues, challenges
Schafer, Valerie UL

Scientific Conference (2019, June 26)

This conference described and analyzed the recent evolutions in the field of the history of Internet and of the Web, underlining new trends and challenges.

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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 detailCharacterizations and enumerations of classes of quasitrivial n-ary semigroups
Devillet, Jimmy UL; Couceiro, Miguel

Scientific Conference (2019, June 23)

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See detailOverestimation of physical activity among young people: Does age and gender play a role?
Eckelt, Melanie UL; Hutmacher, Djenna UL; Steffgen, Georges UL et al

Scientific Conference (2019, June 22)

Background and purpose: Due to the continuous decrease of physical activity (PA) of people in industrialized countries (Kohl et al., 2012), PA behavior and its psychological foundations has become a key ... [more ▼]

Background and purpose: Due to the continuous decrease of physical activity (PA) of people in industrialized countries (Kohl et al., 2012), PA behavior and its psychological foundations has become a key issue in health-related research. Studies show that most people tend to overesti-mate their habitual PA (Skender et al., 2016), however, there is very little research on the role of demographic variables in this respect. Therefore, the aim of this study was to examine whether age and/or gender affect the (over)estimation of PA among children and adolescents. Methods: Data of 75 students (38 girls and 37 boys, 10 to 18 years) of various primary and sec-ondary schools were randomly included in the study. Habitual PA was assessed through an online self-report questionnaire (Schmidt et al., 2017) as well as by wearing an accelerometer (Acti-Graph GT3X-BT) over seven consecutive days. A multiple regression analysis was used to ana-lyze the impact of age and gender on the accuracy of PA estimation. Results: The students reported being active for at least 60 minutes on average on 4,0 ± 2,1 days per week, whereas the accelerometer data verify only 1,8 ± 1,6 days per week. Thus, a majority of 76% of the children and adolescents overestimated and 9% underestimated their PA. Almost 15% were correct in their PA estimation. However, results of the regression analysis indicate neither an effect of age ( = .003, p > .1) nor of gender ( = -.070, p > .1). Conclusions: Overestimation of PA is common not only among adults but also among children and adolescents. However, this misperception appears to be independent of age and gender, at least in the age group considered here. Future studies should examine further demographic and psychological variables in order to explain why most of the people significantly overestimate their habitual PA. [less ▲]

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See detailBridging the Gap between Requirements Modeling and Behavior-driven Development
Alferez, Mauricio UL; Pastore, Fabrizio UL; Sabetzadeh, Mehrdad UL et al

Scientific Conference (2019, June 20)

Acceptance criteria (AC) are implementation agnostic conditions that a system must meet to be consistent with its requirements and be accepted by its stakeholders. Each acceptance criterion is typically ... [more ▼]

Acceptance criteria (AC) are implementation agnostic conditions that a system must meet to be consistent with its requirements and be accepted by its stakeholders. Each acceptance criterion is typically expressed as a natural-language statement with a clear pass or fail outcome. Writing AC is a tedious and error-prone activity, especially when the requirements specifications evolve and there are different analysts and testing teams involved. Analysts and testers must iterate multiple times to ensure that AC are understandable and feasible, and accurately address the most important requirements and workflows of the system being developed. In many cases, analysts express requirements through models, along with natural language, typically in some variant of the UML. AC must then be derived by developers and testers from such models. In this paper, we bridge the gap between requirements models and AC by providing a UML-based modeling methodology and an automated solution to generate AC. We target AC in the form of Behavioral Specifications in the context of Behavioral-Driven Development (BDD), a widely used agile practice in many application domains. More specially we target the well-known Gherkin language to express AC, which then can be used to generate executable test cases. We evaluate our modeling methodology and AC generation solution through an industrial case study in the financial domain. Our results suggest that (1) our methodology is feasible to apply in practice, and (2) the additional modeling effort required by our methodology is outweighed by the benefits the methodology brings in terms of automated and systematic AC generation and improved model precision. [less ▲]

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See detail"Are you a boy or girl?" Who are the non-responders
Heinz, Andreas UL; Catunda, Carolina UL; van Duin, Claire UL et al

Scientific Conference (2019, June 20)

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some ... [more ▼]

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some participants may have understandable reasons for not reporting their gender, e.g. questioning their gender identity. Objective: How many students and which students do not answer the question on gender? Methods: HBSC 2018 raw data from Ireland, Luxembourg, Belgium and France are compared. To explore the reasons for non-response, we divided the participants into 3 groups: 1. Responders answered both sociodemographic questions (age and gender) 2. age non-responders did not answer the question on age. 3. Gender non-responders answered the question on age, but not the one on gender. Results: Between 0.8% (Ireland) and 1.2% (Luxembourg) of participants did not report their gender. About half of them did not answer the age question either. However, the other half belong to the group of gender non-responders and this group is disadvantaged compared to responders: they report lower life satisfaction, lower self-rated health, more health complaints, less peer support and their WHO-5 Well-being score is lower. Not answering the question on gender is rare. If the participants answered the question on age, but not the question on gender, then the variable gender is missing not at random. Implication: The question arises whether the group of gender non-responders should be included in the analysis and whether the question on gender should be asked differently in the future. [less ▲]

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See detail„What’s a normal weight?“ – Weight assessment standards in Origin- and Receiving Country and Immigrant Adolescents’ Weight-Status Self-Assessment
Kern, Matthias Robert UL; Heinz, Andreas UL; Stevens, Gonneke et al

Scientific Conference (2019, June 19)

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight ... [more ▼]

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight-status misperception differs considerably cross-nationally, indicating that individual weight-status assessment is informed by culturally transmitted standards of evaluation. For adolescents with a migration background, this brings up the problem of multiple frames of reference, as their perception of weight-status may be influenced by different cultural standards. Objective: We investigate the extent to which the assessment of one's own weight-status is based on standards of the heritage country or the receiving country. Methods: Data are retrieved from the 2014 Health Behaviour in School-Aged Children study. The cross-national design of the study enabled us to aggregate weight-evaluation standards for 41 countries and subsequently identify a large sample of 8132 immigrant adolescents in 23 receiving countries from 41 heritage countries. The influence of heritage- and receiving country standards of evaluation was assessed using cross-classified multilevel models. Results: Descriptive analyses reveal considerable differences in weight-evaluation standards between the countries. We find evidence of a significant influence of both heritage- and receiving culture standards of evaluation, with a stronger impact of receiving culture standards. Stratified analyses reveal a stronger influence of heritage culture standards among first- than among second-generation immigrants, and a stronger influence of receiving culture standards among second- than among first-generation immigrants. Conclusions: The results corroborate our expectations regarding the persistency of cultural standards and help to understand inter-ethnic differences in weight-status assessment. [less ▲]

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See detailPhase field fracture model for viscoplastic materials in large deformations
Kabore, Brice Wendlassida UL; Loew, Pascal Juergen UL; Peters, Bernhard UL

Scientific Conference (2019, June 13)

Phase-field modeling approach to material fracture and damage has received a growing interest among researchers. It has proven to be an effective way to address crack related discontinuities in continuum ... [more ▼]

Phase-field modeling approach to material fracture and damage has received a growing interest among researchers. It has proven to be an effective way to address crack related discontinuities in continuum mechanics. Also, it solves the problem related to tracking the fracture surface by simply representing the fracture phase with a continuous field variable. Recently, phase-field fracture models have been extended to finite deformations, crack nucleation and applied to complex material behaviors such as plasticity and viscoplasticity. In this contribution we describe a viscoplastic model coupled with a phase-field dynamic fracture model in a large strain formulation. The model include damage, history, rate and temperature dependent behavior. A finite element implementation is presented in a staggered time integration. Moreover, we address the crack closure and crack surfaces interpenetration taking into account tension-compression strength asymmetry. Performance of the model on dynamic crack propagation are presented. [less ▲]

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See detailLe rôle du Pôle Européen de Développement entre le Luxembourg, la Belgique et la France dans l’émergence d’un territoire transfrontalier
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid

Scientific Conference (2019, June 07)

Au pays des trois frontières (Athus en Belgique, Longwy en France, Pétange au Luxembourg), ces territoires ont connu une histoire commune du déclin industriel. Dans le cadre de programme européen de ... [more ▼]

Au pays des trois frontières (Athus en Belgique, Longwy en France, Pétange au Luxembourg), ces territoires ont connu une histoire commune du déclin industriel. Dans le cadre de programme européen de reconversion de ces espaces, l'implantation d'un pôle européen de développement au milieu des années 1980, a constitué le principal instrument de reconversion de ces territoires. Après 20 ans de fonctionnement, le PED a produit différents effets sur la structuration de ces territoires transfrontaliers : une diversification inégale de part et d'autre des frontières du tissu productif local, une accélération des mobilités transfrontalières avec le développement du travail frontalier, un accroissement de la population locale avec de nouveaux profils sociologiques qui marque de nouvelle logique de mobilité résidentielle, ... Si le PED a permis d'amortir fortement la crise du système productif local, il a néanmoins contribué à diversifier les trajectoires de développement territorial de part et d'autre des frontières. On voit se dessiner au pays des trois frontières, un nouveau modèle de segmentation territoriale traduisant la juxtaposition de zones d'activités dynamiques d'un côté de la frontière avec des territoires à vocation résidentielle de l'autre côté de la frontière. [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 detailMagnetic neutron scattering studies on Nd-Fe-B magnets (Keynote Lecture)
Michels, Andreas UL

Scientific Conference (2019, June 05)

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See detailA forcing fictitious domain/immersed boundary method for super-quadric shape of particulate flow simulation of cementitious material
Wu, Mingqiu UL; Peters, Bernhard UL; Dressler, Inka

Scientific Conference (2019, June 05)

Fictitious domain/immersed boundary method (FD/IBM) has recently been used for particulate flows and complex fluid-solid interaction problems. The advantage of FD/IBM over the body- fitted method is that ... [more ▼]

Fictitious domain/immersed boundary method (FD/IBM) has recently been used for particulate flows and complex fluid-solid interaction problems. The advantage of FD/IBM over the body- fitted method is that it substantially simplifies grid generation for immersed geometries, and it is easier to handle moving boundary situations. FD/IBM even allows the use of a stationary and non- deformation background mesh, as well as it reduces the cost of computation by avoiding generation of a body-fitted mesh for each time step. In this work, we develop a new platform to directly simulate super-quadric (SQ) particles in fluid based on a forcing fictitious domain method. Specifically, a super-quadric particle function is used to represent particle with varying shapes and sizes as encountered for concrete and mortar. The immersion of particles in fluid is handled by imposing a rigidity solid body motion in the particle domain, as well as adding a forcing term to the Navier-stokes equation by integral of pressure gradient and particle related velocity over the whole particle domain. Particle shapes are given by changing the super-quadric parameters of SQ equation. Particle motions, which occur during pumping of cementitious material, can be calculated and tracked by solving Newton’s equations of motions using the extended discrete element method (XDEM)[4] while the data of fluid flow properties are obtained by solving the Navier-Stokes equations which govern the fluid phase. Hence, a particle interface resolving solver is developed by coupling XDEM and IBM. We validate our solver by performing flow around particles and free falling of a particle in the channel at different parameters in 2D and 3D. The final objective of this work is to develop a particle-resolved direct numerical simulation platform to predict highly packed fluids with different shapes of particles and over a wide range of particle sizes. [less ▲]

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See detailInvestment fund performance validation - Vine copulae estimation using a minimum spanning tree
Petijean, Simon; Schiltz, Jang UL

Scientific Conference (2019, June 03)

Catching the dependencies between financial time series is a complex exer- cise with a lot of challenges, both of theoretical and practical nature. We develop a metho- dology to model portfolio dynamics ... [more ▼]

Catching the dependencies between financial time series is a complex exer- cise with a lot of challenges, both of theoretical and practical nature. We develop a metho- dology to model portfolio dynamics using the minimum spanning tree methods combined with econometric models which solves a good part of these challenges. We use a tracking error that is equivalent to the Euclidean distance, to cluster the closest market indices. Financial risk is difficult to manage, because risk is evolving constantly and depends on very different factors like volatility, liquidity, asset class etc. To capture this evolution we develop a recursive portfolio validation method that reveals the true nature of the evolution of the risk structure of financial portfolios. We investigate several portfolio strategies to understand the dynamics behind the holdings. We thus validate the results of our portfolio analysis. We use a vine copula construction, which allows us to separate the marginal estimation from the dependence estimation and calibrate the underlying dynamics very precisely. The minimum spanning tree method helps us to create a robust tree foundation to support the entire vine structure. Starting from a portfolio analysis, we are thus able to validate the portfolio valuation over a specific period of time. [less ▲]

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See detailŽidé, identita, domov a rodinné dědictví
Bronec, Jakub UL

Scientific Conference (2019, June 01)

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See detailGrenze als multiple (Sozio-)Materialität
Wille, Christian UL

Scientific Conference (2019, June)

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See detailRe-thinking untraceability in the CryptoNote-style blockchain
Yu, Jiangshan; Au, Man Ho Allen; Verissimo, Paulo UL

Scientific Conference (2019, June)

We develop new foundations on transaction untrace- ability for CryptoNote-style blockchain systems. In particular, we observe new attacks; develop theoretical foundations to model transaction ... [more ▼]

We develop new foundations on transaction untrace- ability for CryptoNote-style blockchain systems. In particular, we observe new attacks; develop theoretical foundations to model transaction untraceability; provide the least upper bound of transaction untraceability guarantee; provide ways to efficiently and automatically verify whether a given ledger achieves optimal transaction untraceability; and provide a general solution that achieves provably optimal transaction untraceability. Unlike previous cascade effect attacks (ESORICS’ 17 and PETS’ 18) on CryptoNote-style transaction untraceability, we consider not only a passive attacker but also an active adaptive attacker. Our observed attacks allow both types of attacker to trace blockchain transactions that cannot be traced by using the existing attacks. We develop a series of new games, which we call “The Sun-Tzu Survival Problem”, to model CryptoNote-style blockchain transaction untraceability and our identified attacks. In addition, we obtain seven novel results, where three of them are negative and the rest are positive. In particular, thanks to our abstract game, we are able to build bipartite graphs to model transaction untraceability, and provide reductions to formally relate the hardness of calculating untraceability to the hardness of calculating the number of perfect matchings in all possible bipar- tite graphs. We prove that calculating transaction untraceability is a #P−complete problem, which is believed to be even more difficult to solve than NP problems. In addition, we provide the first result on the least upper bound of transaction untraceability. Moreover, through our theoretical results, we are able to provide ways to efficiently and automatically verify whether a given ledger achieves optimal transaction untraceability. Furthermore, we propose a simple strategy for CryptoNote-style blockchain systems to achieve optimal untraceability. We take Monero as a concrete example to demonstrate how to apply this strategy to optimise the untraceability guarantee provided by Monero. [less ▲]

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See detailA real time hybrid controller for regulating bus operations and reducing stops at signals
Laskaris, Georgios UL; Seredynski, Marcin; Viti, Francesco UL

Scientific Conference (2019, June)

We propose a hybrid controller which consists of holding and a Driver Advisory System (DAS). It combines the objectives of seeking the regularization of operation and the reduction of stop and go actions ... [more ▼]

We propose a hybrid controller which consists of holding and a Driver Advisory System (DAS). It combines the objectives of seeking the regularization of operation and the reduction of stop and go actions at signalized intersections. A simple headway based holding criterion is applied at stops to define the time needed to maintain even spaced headways between buses and additionally a speed recommendation is given to traverse during green indication at the downstream signalized intersection. The controller is tested using simulation for a bus line of the city of Luxembourg, Luxembourg and compared to a benchmark scenario, the single application of bus holding, two advisory systems and different levels of transit signal priority. Results show that there are additional benefits compared to traditional holding in terms of regularity while similar performance to strong transit signal priority is achieved in terms of time spent at traffic lights. [less ▲]

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See detailResilience and innovative work behaviours of entrepreneurs: The moderating role of gender
Geraudel, Mickaël UL; Cesinger, Beate; Gundolf, Katherine et al

Scientific Conference (2019, June)

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See detailLeveraging GIS Data and Topological Information to Infer Trip Chaining Behaviour at Macroscopic Level
Carrese, Filippo; Fusco, Gaetano; Cantelmo, Guido et al

Scientific Conference (2019, June)

One of the open challenges in transport modelling is to estimate within-day demand flows that reflect the complexity of individual activity-travel behaviour. While disaggregate (Activity-Based) demand ... [more ▼]

One of the open challenges in transport modelling is to estimate within-day demand flows that reflect the complexity of individual activity-travel behaviour. While disaggregate (Activity-Based) demand models can recreate realistic daily mobility patterns at an individual level, they usually require an accurate knowledge of individual user behaviour (i.e. via travel surveys), which is not always available. As a result, practitioners often turn to aggregate demand models, that have the advantage of being less demanding in terms of data but typically under represent the demand for secondary activities. In this work, we take research on within-day demand modelling one step forward by proposing a framework that combines traditional methodologies with heterogeneous data sources in order to explicitly represent trip chaining at an aggregated level. We show that the combination of web-based crowd sensed data, network data and behavioural constraints allows to capture complex spatial and temporal correlations between demand patterns. The methodology is applied on the classical Gravity model to show how to incorporate within-day dynamics. Yet, any alternative demand model can be adopted. In our case, Generation and Attraction are used to estimate the systematic demand, that is enriched of information about individual activity patterns, and then a novel definition of impedance function based on Hagestraand ellipse theory plays a central role in spatially distributing locations of trips using geographic relationships and constraints deriving from space-time behaviour. A case study for Luxembourg City has been presented to show the potential of the methodology: the choice of using data from a different spatial context to account for the temporal dimension has been validated through comparisons with official statistics. The results of simulating a workplace relocation show the advantages of this new approach in representing demand related to secondary activities. [less ▲]

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See detailToward a contingent model of talent management: The case of Aerospace SMEs in Luxembourg
USANOVA, Ksenia; Geraudel, Mickaël UL

Scientific Conference (2019, June)

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See detailSupply characteristics and membership choice in round-trip and free-floating carsharing systems
Cisterna, Carolina UL; Giorgione, Giulio UL; Cipriani, Ernesto et al

Scientific Conference (2019, June)

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See detailEine Krise der Öffentlichkeit : Protest, Populismus, "Neue Medien"
Kohns, Oliver UL

Scientific Conference (2019, June)

Detailed reference viewed: 37 (1 UL)
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See detailIs Life Satisfaction Contagious?
Catunda, Carolina UL; Heinz, Andreas UL; van Duin, Claire UL et al

Scientific Conference (2019, June)

Background: Life satisfaction (LS) is a major component of adolescents’ subjective well-being, facilitating adaptive development and influencing health. Literature shows that social support influences ... [more ▼]

Background: Life satisfaction (LS) is a major component of adolescents’ subjective well-being, facilitating adaptive development and influencing health. Literature shows that social support influences adolescents LS. In addition, the social network can affect health-related behaviors of adults - individuals that smoke or exercise tend to group together. However, the effects of others` LS on adolescents’ individual evaluation of LS (the contagion hypothesis) is still to be addressed. Objective(s): To test the contagion hypothesis of adolescents’ life satisfaction (how LS of proxies influences the individual LS appraisal). Method: Data is from 9738 students (aged 9-20) from the 2018 HBSC Luxembourg survey. A multilevel analysis was used to evaluate LS, with the school classes as subjects (model 1) to estimate the influence of being in a certain school class. Later, FAS, age and gender were entered as control variables (model 2). Results: The grand mean (intercept) for LS in model 1 was 7.57 (SE=.03, p<.001). For model 2, FAS (b=.47, SE=.03, p<.001), age (b=-.14, SE=.01, p<.001) and gender (b=-.23, SE=.04, p<.001) were significantly predictive of LS. The grand mean for LS, conditioned on the presence of FAS, age and gender, was 9.02 (SE=.05, p<.001). Interclass Correlation Coefficient decreased from model 1 (ICC=.08) to model 2 (ICC=.04). Conclusions: Results suggest that part of the variance of LS can be explained by the school class level. In other words, school class clusters have an influence on their LS, indicating that the LS of adolescents from a class partially accounts for individual LS. [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 UL; D'Ariano, Andrea et al

Scientific Conference (2019, June)

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

Abstract—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 detailCraving for violence: The role of Dark Personality traits in violent video game preference
Melzer, André UL

Scientific Conference (2019, June)

Background: Violent and antisocial video games are popular, but little is known why players are drawn to these kinds of games. This present research tested whether there is a connection between player ... [more ▼]

Background: Violent and antisocial video games are popular, but little is known why players are drawn to these kinds of games. This present research tested whether there is a connection between player preferences for violent games and characteristics of so called “dark” personality traits. Method: Relying on a user-centered approach, three online studies (N=662) examined the role of “dark” personality traits together with a novel violent game preference short scale. Results: Study 1 and 2 indicated strong correlations between trait aggression and players’ interest in explicit depictions of blood and gore and games that provide experiences of domination and antisocial behavior. In Study 3, the new scale was tested together with participants’ trait aggression, trait empathy, and the Dark Triad traits of psychopathy, Machiavellianism, and narcissism. Games featuring violence and the possibility of antisocial behavior were found to meet the needs of players who lack empathy and show callous, impulsive, and exploitive (but not narcissistic) attributes. Conclusions: Findings of individual motivators for game violence significantly extend the literature that is predominantly focusing on the effects of playing these games. Apparently, game preferences and playing habits fulfill individual needs that are at least partly determined by particular, i.e. “dark”, personality characteristics. [less ▲]

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See detailReading in a new technology environment: Are reading assessments still in the ballpark?
Reichert, Monique UL; Krämer, Charlotte UL; Wollschläger, Rachel UL

Scientific Conference (2019, May 31)

Using digital technologies for daily activities such as communicating or learning has become ubiquitous today. This trend is also clearly visible within the field of reading habits, especially among ... [more ▼]

Using digital technologies for daily activities such as communicating or learning has become ubiquitous today. This trend is also clearly visible within the field of reading habits, especially among adolescents: Recent studies underline that traditional text types (e.g., fiction books) are no longer part of the more commonly read text materials (Duncan et al., 2016). The question addressed in the presentation will deal with the degree to which different reading habits impact on adolescents’ reading competence, and is intended to encourage a discussion about the construct of reading competence as generally operationalized in reading competence assessments. We base our considerations on the analyses of two data sets: The first one deals with the extra-curricular reading habits of 3074 9th grade students, and the impact of these practices on their German reading competence. The corresponding data are taken from a survey regarding their reading habits in terms of ten different types of texts (e.g., non-fiction books, e-mails). A regression analysis reveals the strongest impact on reading competence for narrative texts, whilst reading digital texts – although highly attractive among the students – is found to be of minor importance. The second data set differentiates between the reading habits of around 4500 adolescents regarding 1) traditional (printed) texts, 2) digitalised texts (e.g., e-books), and 3) text types that have emerged with new technologies (e.g., social media texts). The ensuing discussion compares particularities of classical and digital texts, and raises questions concerning the construct of reading competence (to be) targeted by standardized tests. [less ▲]

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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

Scientific Conference (2019, May 30)

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See detailMotivationsregulation im Sportunterricht und ihre Relevanz für die körperliche Aktivität in der Freizeit
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Scientific Conference (2019, May 30)

Hintergrund: Angesichts der kontinuierlichen Abnahme der körperlichen Aktivität von Kindern und Jugendlichen erweist sich die Stärkung der Motivation im Sportunterricht als ein bedeutsamer Ansatz zur ... [more ▼]

Hintergrund: Angesichts der kontinuierlichen Abnahme der körperlichen Aktivität von Kindern und Jugendlichen erweist sich die Stärkung der Motivation im Sportunterricht als ein bedeutsamer Ansatz zur Sportaktivierung (Standage, Duda, & Ntoumanis, 2005). Die Selbstbestimmungstheorie (Deci & Ryan, 2000) postuliert, dass ein eher intrinsischer Regulationstyp sowie ein autonomie-förderndes Klima im Sportunterricht die Intention körperlicher Aktivität steigern. Basierend auf dem trans-kontextuellen Modell (Hagger, Chatzisarantis, Culverhouse, & Biddle, 2003) wird in der vorliegenden Studie geprüft, ob der motivationale Regulationstyp aus dem Sportunterricht selbigen hinsichtlich der körperlichen Aktivität im Freizeitbereich vorhersagen kann. Methode: 264 Schüler von 11 bis 21 Jahren (52.6% Mädchen) aus Luxemburg nahmen an der Studie teil. Neben der Bedürfnisunterstützung (Autonomie, Geselligkeit und Kompetenz; Standage, Duda, & Ntoumis, 2005), dem Regulationstyp im Sportunterricht (BPNES; Vlachopoulos, Ntoumanis, & Smith, 2010) sowie zur körperlichen Aktivität in der Freizeit (BREQ-II; Markland & Tobin, 2004) wurde auch die Intention zu körperlicher Aktivität erfasst (Hagger, et al. 2003). Ergebnisse: Eine SEM-Analyse belegt einen signifikanten Zusammenhang zwischen dem intrinsischen Regulationstyp im Sportunterricht und der intrinsischen Regulation zur körperlichen Aktivität in der Freizeit. Letztere erweist sich hierbei als positiver Prädiktor der Intentionsbildung. Zudem geht die Unterstützung der drei Grundbedürfnisse durch den Sportlehrer mit einer signifikant höheren intrinsischen Regulation sowie niedrigeren Amotivation im Sportunterricht einher. Schlussfolgerung: Die Befunde zeigen auf, dass ein intrinsischer Regulationstyp im Sportunterricht kontextübergreifend mit dem Regulationstyp im Freizeitbereich zusammenhängt, welcher wiederum die Aktivitätsintention erhöht. Die Implikationen dieser Befunde für den Sportunterricht werden im Rahmen des Vortrags diskutiert. [less ▲]

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See detailSocial and behavioral factors in cognitive aging: Applying the causal inference framework in observational studies
Leist, Anja UL

Scientific Conference (2019, May 25)

Rationale: There is an urgent need to better understand how to maintain cognitive functioning at older ages with lifestyle interventions, given that there is currently no medical cure available to prevent ... [more ▼]

Rationale: There is an urgent need to better understand how to maintain cognitive functioning at older ages with lifestyle interventions, given that there is currently no medical cure available to prevent, halt or reverse the progression of cognitive decline and dementia. However, in current models, it is still not well established which social and behavioral modifiable factors (e.g. education, BMI, physical activity, sleep, depression) matter most at which ages, and which behavioral profiles are most protective against cognitive decline. In the last years, advances in the fields of causal inference have equipped epidemiology and social sciences with methods and models to approach causal questions in observational studies. Method: The presentation will give an overview of the causal inference framework to investigate the value of behavior changes in cognitive aging. Motivated by conflicting recent publications if physical activity should or should not be recommended to reduce individual risk of cognitive decline, we emulate a target trial where sedentary people are followed over the course of the Survey of Health, Ageing and Retirement in Europe (SHARE) and compare their cognitive development depending on initiating or not physical activity at a later measurement. Extended inclusion/exclusion criteria, and concepts of incident versus prevalent users and multiple eligibility are introduced. Discussion: The causal inference framework applied to observational studies is able to guide study design to reconcile conflicting evidence from intervention and observational studies. Investigations under the new framework have fewer ethical considerations compared to intervention research and, considering the need to follow up individuals over several decades, are considerably more cost-effective. Limitations are discussed. [less ▲]

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See detailGrenzüberschreitende Berufsausbildung als grenzüberschreitender Lernprozess in der grenzregion Lothringen - Saarland
Funk, Ines; Nienaber, Birte UL; Dörrenbächer, Peter

Scientific Conference (2019, May 24)

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See detailCompetence support in physical education: a predictor towards a more self-determined physical activity behavior?
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Scientific Conference (2019, May 22)

Objectives: Given a widespread continuous decrease in children’s and adolescents’ 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 adolescents’ physical activity (PA), the potential of physical education (PE) in promoting young people’s PA motivation and behavior has become a key issue. Research in line with the trans-contextual model highlights the support of perceived autonomy in PE as a significant predictor for self-determined PA behavior in a leisure-time (LT) context (Hagger et al., 2003). However, the impact of competence and relatedness support still remains unclear. Therefore, the present study aimed to investigate the role of support during PE, differentiated into three basic needs for behavioral regulation in PE and LT. It was expected that, in addition to perceived autonomy, competence and relatedness would be relevant predictors. Method: 244 students (139 girls) from Luxembourg, ranging from 11 to 21 years, participated in the study. Via a digital questionnaire, the scales need support (perceived autonomy, competence and relatedness; Standage, Duda, & Ntoumanis, 2005), basic needs (BPNES; Vlachopoulos, Ntoumanis, & Smith, 2010), and external and intrinsic motivation in PE (PLOC-R; Vlachopoulos et al., 2011) as well as in LT (BREQ-II; Markland & Tobin, 2004) were applied in the classroom. With regard to the theory of planned behavior (Ajzen, 1985), the attitudes, perceived behavioral control, and intentions toward PA were assessed (Hagger et al., 2003). Results: A SEM analysis showed that competence support in PE was the major predictor for self-determined behavior in PE, while perceived autonomy produced mixed findings. Relatedness support had a negative effect on external regulated behavior in PE. In accordance with the assumptions of the trans-contextual model, similar behavioral regulations in PE and LT were found. Furthermore, a more self-determined behavior in LT predicted higher attitudes, subjective norms, and perceived behavioral control towards PA, which increased the intention of doing sports. Discussion: Results suggest that the children’s perceived support of competence from the teacher during PE is an important factor to increase self-determined PA behavior. Further intervention programs may focus on improving the perception of competence during PE in order to increase motivation. In addition, these findings underline the importance for future research to consider the different roles of perceived support of competence, autonomy and relatedness in PE. [less ▲]

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See detailPreschool teachers’ language-supporting strategies in multilingual education in Luxembourg
Kirsch, Claudine UL

Scientific Conference (2019, May 16)

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See detailThe Effect of Professional Development on Multilingual Education in Early Childhood in Luxembourg.
Kirsch, Claudine UL; Aleksic, Gabrijela; Mortini, Simone UL et al

Scientific Conference (2019, May 15)

In sum, these findings show that the PD made the practitioners reflect on their language use, which, in turn, contributed to a positive stance towards multilingualism (Egert et al., 2018; Garrity et al ... [more ▼]

In sum, these findings show that the PD made the practitioners reflect on their language use, which, in turn, contributed to a positive stance towards multilingualism (Egert et al., 2018; Garrity et al., 2015; Peeters, Cameron, Lazzari, et al., 2014). The partly contradictory findings – embracing translanguaging while holding on to language separation - are reminiscent of other studies showing that practitioners do not simply substitute one set of beliefs with a different one but can hold contradictory beliefs (Levin and Wadmany, 2006). Reflecting on the professional development carried out in New York, Seltzer (2018) reported that the participating teachers simultaneously evidenced ideological shifts and deficit thinking, such as defining children’s linguistic skills as baby talk. [less ▲]

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See detailMultiscale fracture: a natural connection between reduced order models and homogenisation
Bordas, Stéphane UL; Beex, Lars UL; Chen, Li UL et al

Scientific Conference (2019, May 13)

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See detailDisplacement based polytopal elements a strain smoothing and scaled boundary approach
Bordas, Stéphane UL; Natarajan, Sundararajan

Scientific Conference (2019, May 03)

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See detailCanonical quantization for compact quantizable Kaehler manifolds
Schlichenmaier, Martin UL

Scientific Conference (2019, May 02)

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See detailInnovative work behaviors of entrepreneurs: The role of resilience and satisfaction with life
Palmer, Carolin; Jaouen, Annabelle; Gundolf, Katherine et al

Scientific Conference (2019, May)

We examine the antecedents of entrepreneurs’ innovative work behavior through the prism of two personality variables: resilience and satisfaction with life. Based on a sample of 325 French entrepreneurs ... [more ▼]

We examine the antecedents of entrepreneurs’ innovative work behavior through the prism of two personality variables: resilience and satisfaction with life. Based on a sample of 325 French entrepreneurs, we find a direct effect of both variables. [less ▲]

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See detailRise of the machines - Moral decisions in Detroit: Become Human
Holl, Elisabeth UL

Scientific Conference (2019, May)

Moral decisions in video games have become increasingly popular. This work in progress project applies established theories on mediated morality (e.g., MIME; Tamborini, 2011) to the cutting-edge video ... [more ▼]

Moral decisions in video games have become increasingly popular. This work in progress project applies established theories on mediated morality (e.g., MIME; Tamborini, 2011) to the cutting-edge video game Detroit: Become Human. The in the game implemented feature of displaying world statistics provides valuable information on how players engage in meaningful moral decision within a virtual world. Statistics will be aggregated and analyzed in relation to the available decision time span, the involved characters and different moral foundations. [less ▲]

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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 detailMulticultural society - multiple ways to negotiate identity
Murdock, Elke UL

Scientific Conference (2019, April 30)

The 21st century has been called the “age of migration” (Castles & Miller, 2009). International migration is a growing phenomenon, both in terms of scope and complexity and affects virtually all countries ... [more ▼]

The 21st century has been called the “age of migration” (Castles & Miller, 2009). International migration is a growing phenomenon, both in terms of scope and complexity and affects virtually all countries in the world (United Nations, 2009). The global migration system has changed over recent decades with regard to origins and destinations for migration. In the 20th century, Europe was a major area for emigration, but has now become a target for immigration, with most European countries, including Iceland, hosting significant minority immigrant populations. In Luxembourg, nearly half of the population is foreign – the foreign population percentage currently stands at 48%. Within this context majority and minority become fluid with the migration process itself being fluid, ranging from daily migration (transnational commuters), to medium-term stays, return visits and permanent immigration including uptake of citizenship. Within such a plurally composed society, culture contact is a permanent feature in daily life. Nationality becomes a salient feature as culture contact tends to prompt reflection, resulting in questioning and (re-)negotiation of national identity. This affects both the native and the diverse immigrant population – with diversity going beyond the level of country of origin as many individuals have very complex biographies. Using multicultural, multilingual Luxembourg as a case study example, I will present examples for the construal process of national identity for different groups, illustrating how (national) identity is negotiated at individual level. As can be expected, the identity construal process becomes more complex within a multicultural context. [less ▲]

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See detailThe Importance of Socio-Emotional Skills and Behaviour in Preschool for Later Outcomes
Aleksic, Gabrijela UL; Christine, Merrell; Peter, Tymms

Scientific Conference (2019, April 18)

Background to the Study In order to meet the socio-economic challenges of the 21st century, a blend of cognitive and socio-emotional skills is required (Temple, 2002). Socio-emotional skills are important ... [more ▼]

Background to the Study In order to meet the socio-economic challenges of the 21st century, a blend of cognitive and socio-emotional skills is required (Temple, 2002). Socio-emotional skills are important for personal well-being, life satisfaction, healthy life styles, active citizenship and safer societies (OECD, 2015). No study in Serbia has investigated the development of young children’s socio-emotional skills and behaviour, and the relationship with academic progress in Serbia before and this directly responds to the urgent call for more information concerning the Serbian preschool education (Baucal et al., 2016). The findings are of broader relevance to other countries; as noted in the OECD (2015) report, socio-emotional development continues through late childhood and adolescence which gives a space for intervention programmes that can help reduce social inequalities among children. Theoretical Framework Socio-emotional skills are a range of competences including emotion knowledge, emotional and behavioural regulatory abilities and social skills (Denham, 2006). When children enter school and have positive peer and teacher interactions, they will develop more positive attitudes towards school tasks, engage more into school activities, be more persistent and perform higher (e.g., Arnold et al., 2012; Fantuzzo et al., 2007). Furthermore, studies have shown that children with behavioural difficulties such as inattention, hyperactivity and impulsivity display more delinquent behaviour as adolescents and achieve academically lower than their peers (e.g., Frazier et al., 2007; Merrell et al., 2017). Data In this empirical study we explored the links between socio-emotional skills, behaviour, mathematics and literacy performance of preschool children in Serbia over the course of 14 months. Teachers rated 159 children (51% of girls) aged 5-8 by Personal, social and emotional development scale, and Behaviour rating scale on inattention, hyperactivity and impulsivity. These scales were included in the Performance Indicators in Primary School (PIPS; Tymms, 1999), an adaptive test that measures early literacy and mathematics. Results • At all three times, girls were rated more positively than boys in socio-emotional skills and behaviour, except for adjustment to school setting where there were no differences. • At Time 3, when children entered school, their socio-emotional skills and behaviour were associated with gender, mathematics at Time 1 and their socio-emotional and behaviour ratings at Time 2, controlling for maternal education at Time 1. • Mathematics at Time 3 was not associated with socio-emotional skills nor with specific behaviour. • Literacy at Time 3 was associated with mathematics and social skills at Time 1, and literacy at Time 2, controlling for gender and maternal education. Significance of the Study This study offers the first insight into the links between socio-emotional skills, behaviour and mathematics and literacy performance of preschool children in Serbia which will inform the development and evaluation of interventions. Attrition of the sample limits the findings. [less ▲]

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See detailHow can we support lecturers in English-medium instruction?
Deroey, Katrien UL

Scientific Conference (2019, April 13)

English-medium instruction (EMI) is a worldwide phenomenon. EMI language and communication issues (e.g. Hu et al., 2014; Murray, 2015; Werther et al., 2014) have led to calls for EAP practitioners to ... [more ▼]

English-medium instruction (EMI) is a worldwide phenomenon. EMI language and communication issues (e.g. Hu et al., 2014; Murray, 2015; Werther et al., 2014) have led to calls for EAP practitioners to collaborate with lecturers and other HE stakeholders to explore ways in which these lecturers can be supported and teaching standards ensured (Coleman, 2006; Doiz et al., 2013; Dubow & Gundermann, 2017). The design and implementation of EMI training and support programmes can be an especially challenging task for EAP practitioners. First, lecturers may not recognize the need for support and may be reluctant to be assessed. Second, we need to factor in practical considerations such as their limited availability and possible reluctance to attend ‘classes’ with colleagues. Third, we have limited resources in terms of specialized standardized tests, training materials and research literature that could inform our 'course' design. Innovative approaches are therefore needed to factor in all these circumstances. This paper has two main parts. First I summarize research on the challenges EMI lecturers face, including the results of a needs analysis among lecturers at the University of Luxembourg and my work on lecture discourse organization (Deroey, 2015). From the relatively few studies that exist, we will see that lecturers tend to believe they have sufficient English language skills and that reduced interactivity is a particularly common issue. Second, I survey different support and training schemes at HE institutions across the world. Here, it will become clear that work on relevant pedagogical skills needs to be included and an apparently ‘remedial’ approach should be avoided if we want to get lecturers on board. [less ▲]

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See detailDigitisation of musicology at the University of Luxembourg
Sagrillo, Damien UL

Scientific Conference (2019, April 13)

One of the aims of the new government of Luxembourg is to enhance digitisation in all dimensions of daily life. Since years already the literature archive runs a dictionary of Luxembourgish authors. I ... [more ▼]

One of the aims of the new government of Luxembourg is to enhance digitisation in all dimensions of daily life. Since years already the literature archive runs a dictionary of Luxembourgish authors. I will present two projects funded by the Ministry of Culture aiming also to promote and to valorise the musical heritage of Luxembourg by compiling an Encyclopedia of Luxembourg Musicians and by editing the music of Luxembourgish composer Laurent Menager. [less ▲]

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See detailMessung von Ambivalenzen: Ambivalenzerfahrungen zwischen jungen Erwachsenen und ihren Eltern
Albert, Isabelle UL

Scientific Conference (2019, April 12)

Die vorliegende Studie beschäftigte sich mit den Ambivalenzerfahrungen junger Erwachsener und der Rolle des Auszugs aus dem Elternhaus. Die Teilnehmer wohnten entweder noch bei den Eltern, waren bereits ... [more ▼]

Die vorliegende Studie beschäftigte sich mit den Ambivalenzerfahrungen junger Erwachsener und der Rolle des Auszugs aus dem Elternhaus. Die Teilnehmer wohnten entweder noch bei den Eltern, waren bereits komplett ausgezogen oder pendelten zwischen dem Wohnort der Eltern und dem Studienort. Ausgangspunkt war die Frage, ob sogenannte „exit options“ die Erfahrung von Ambivalenz verringern können (siehe auch Dykstra & Komter, 2010). Im Folgenden werden anhand dieser Studie verschiedene Möglichkeiten der direkten und indirekten Erfassung von Ambivalenz veranschaulicht sowie inhaltliche Ergebnisse präsentiert. [less ▲]

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See detailADVANCES IN GEOMETRY INDEPENDENT APPROXIMATIONS
Anitescu, Cosmin; Atroshchenko, Elena; Bordas, Stéphane UL et al

Scientific Conference (2019, April 11)

We present recent advances in geometry independent field approximations. The GIFT approach is a generalisation of isogeometric analysis where the approximation used to describe the field variables no ... [more ▼]

We present recent advances in geometry independent field approximations. The GIFT approach is a generalisation of isogeometric analysis where the approximation used to describe the field variables no-longer has to be identical to the approximation used to describe the geometry of the domain. As such, the geometry can be described using usual CAD representations, e.g. NURBS, which are the most common in the CAD area, whilst local refinement and meshes approximations can be used to describe the field variables, enabling local adaptivity. We show in which cases the approach passes the patch test and present applications to various mechanics, fracture and multi-physics problems. [less ▲]

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See detailLes résistances belge et luxembourgeoise et leurs conceptions européennes
Brüll, Christoph UL

Scientific Conference (2019, April 10)

La deuxième Occupation allemande en un quart de siècle a vu se développer en Belgique et au Luxembourg une série de mouvements de Résistance aux caractéristiques et conceptions politiques très diverses ... [more ▼]

La deuxième Occupation allemande en un quart de siècle a vu se développer en Belgique et au Luxembourg une série de mouvements de Résistance aux caractéristiques et conceptions politiques très diverses. Parmi les Résistants qui s’interrogent sur l’après-guerre, deux tendances lourdes s’affirment : le rétablissement de l’indépendance nationale et la démilitarisation d’une Allemagne vaincue. Il en résulte aussi des plans pour l’Europe qui reposent toutefois rarement sur une approche systématique de la question. Une importance cruciale revient à la question des liens entre mouvements de Résistance et gouvernements en exil. Par ailleurs, il y a des personnalités qui, comme le futur Premier ministre luxembourgeois Pierre Werner, s’engagent aux côtés de la Résistance française et réfléchissent sur l’avenir du continent. La contribution se propose d’établir un inventaire de ces initiatives et d’adopter (là où c’est possible) une perspective comparatiste. Finalement, nous examinerons le rôle des mouvements de Résistance dans la vie politique de l’après-guerre et l’engagement de certains Résistants dans les débuts de l’intégration européenne après 1945. [less ▲]

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See detailIntegrated micromechanical model for slope stability analysis
Kabore, Brice Wendlassida UL; Peters, Bernhard UL

Scientific Conference (2019, April 09)

Advances in supercomputing hardware have made it possible to handle highly complex geomechanical analysis with large data. Thus, particle-based methods are gaining an ever-increasing interest with ... [more ▼]

Advances in supercomputing hardware have made it possible to handle highly complex geomechanical analysis with large data. Thus, particle-based methods are gaining an ever-increasing interest with massively parallel programs being developed. These methods have been applied to the analysis of failure mechanisms and scenarios such as mass movement in landslides, avalanches under static, dynamic or seismic loading condition. They provide deep insights into the meso and micro-scale mechanisms leading to macroscopic instabilities. This contribution describes a micromechanical model for stability analysis and simulation in natural or man-made slopes under complex loading and boundary conditions. Based on the micromechanics of loose granular and compacted geomaterial, microstructural change, viscoelastic deformations, fracture, and healing are explicitly integrated into a coupled discrete particle and beam lattice model. Stress-based failure criteria and energy based dissipation and frictional contact are employed. Both gravity increase and strength reduction methods have been employed to evaluate the Factor of Safety (FoS) and potential failure surface and compared. With an emphasis on the impact of the microstructure and its spatial variability on stress-induced microcracks and crack propagation, this study outlines material models and properties relevant to stability analysis. Special focus has been put on layered slopes which present varying shear strength along the depth formed over time according to pressure, temperature, and moisture such as snowpack. This microstructural approach unifies geometrical and material information and allows the structural assembling layers of different strength. [less ▲]

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See detailThe Influence of Professional Development on Early Years Teachers’ and Educators’ Attitudes and Practices in Luxembourg
Kirsch, Claudine UL

Scientific Conference (2019, April 09)

The present case-study based in multilingual Luxembourg reports on the influence of professional development on two preschool teachers’ attitudes towards multilingual education and their emerging ... [more ▼]

The present case-study based in multilingual Luxembourg reports on the influence of professional development on two preschool teachers’ attitudes towards multilingual education and their emerging multilingual practices. The need for multilingual pedagogies has been recognized and several countries in Europe have implemented multilingual programs in early childhood (García, Lin, & May, 2017; Panagiotopoulou, 2016). Nevertheless, practices often remain monolingual and focus on the development of the majority language (Kratzmann et al., 2017). In Luxembourg, new laws were voted in 2017 that require preschool teachers to develop the three-to-five -year-olds’ skills in Luxembourgish, familiarize them with French, and value home languages. Before 2017, the language policy focused on Luxembourgish. Nevertheless, some teachers had implemented multilingual practices to address the diverse language needs of the children (Kirsch, 2017). In 2015/16, 63,5 % of the four-year-olds did not speak Luxembourgish as a home language (MENJE, 2017). To develop inclusive multilingual practices, researchers at the University of Luxembourg developed a professional development program (thereafter PD) based on the pedagogy of translanguaging (García et al., 2017). The latter is supportive of social justice, places the learners at the centre and gives them some agency over their language use. The 30-hour program was collaborative and inquiry-based and included coaching. The practitioners were invited to implement activities based on books and rhymes in several languages and video-record these activities. The professionals reflected on their practices in the meetings. The research project drew on both qualitative and quantitative research methods. The data collection drew on a questionnaire completed before, during and after the PD; six interviews; six observations of the course and 15 video-recorded classroom activities; four coaching reports and emails after the coaching. The methods of data analysis include paired samples t-test, correlational analysis and content analysis (Braun & Clark, 2006). The findings show a positive effect of PD on the teachers’ knowledge about language learning and their attitudes towards multilingual education. At the beginning of the course, both teachers were influenced by the monolingual language policy in place, parental expectation, and the belief that children learn less Luxembourgish if they encountered other languages. The initial sceptics changed once the teachers began to implement activities in French and home languages, and realized the children’s motivation,engagement and continued progress in Luxembourgish. Both incorporated rituals and regular activities that drew on multiple languages. Both repeatedly acknowledged the impact of the PD, stating that the instruction, the reflection on their activities and the feedback helped them develop different perspectives on their own teaching. The findings of this study confirm that long-term, collaborative and inquiry-based professional development can be transformative (Gaikhorst et al., 2017; Kennedy, 2005; Prenger et al., 2017). They also contribute to the dearth of literature on PD on multilingual education in early years (Egert, 2015). [less ▲]

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See detailEnergy Systemic Risk
Decet, Romain; Lehnert, Thorsten UL

Scientific Conference (2019, April 06)

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See detailConvergence, concurrence, harmonisation – une analyse comparative de la fiscalité Be-Ne-Lux (1945-1992)
Danescu, Elena UL

Scientific Conference (2019, April 04)

The paper aims to investigate the concept, context and socio-economic consequences of fiscal competition and fiscal justice, with a focus on the taxation of Beneux countries. The analysis is carried out ... [more ▼]

The paper aims to investigate the concept, context and socio-economic consequences of fiscal competition and fiscal justice, with a focus on the taxation of Beneux countries. The analysis is carried out at the intersection of several historical fields – national, regional, European and international –, and in a interdisciplinary approach. The research is based on a wide range of primary sources (original archives from Luxembourg, Belgium, the Netherlands, France, Germany and international organisations), by taking into account of a variety of institutions, players and mechanisms, and through the prism of the existing literature in the field. The findings emerged of this analysis may make a valuable addition to this historiography and provide new information, nuances and interpretations in the ongoing debates. [less ▲]

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See detailResearch visit, Chulalongkorn University, Bangkok, Thailand
Wolff, Christian UL

Scientific Conference (2019, April)

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See detailMortgages and Life Time Contracts
Ratti, Luca UL

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 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)

Detailed reference viewed: 75 (12 UL)
See detailMicrofluidic Wet Spinning of Core-Sheath Elastomer-Liquid Crystal Fibers
Honaker, Lawrence William UL; Vats, Shameek UL; Anyfantakis, Emmanouil UL et al

Scientific Conference (2019, March 29)

Liquid crystals encapsulated in fibers have a wide variety of applications in sensing. In order to produce these, several methods have been explored. Electrospinning is among the better-known techniques ... [more ▼]

Liquid crystals encapsulated in fibers have a wide variety of applications in sensing. In order to produce these, several methods have been explored. Electrospinning is among the better-known techniques with considerable successes. Only a limited range of polymers, though, has been used for electrospinning with liquid crystal cores, and the process of electrospinning has many obstacles to its utility at an industrial scale. On the other hand, wet-spinning techniques are better suited for industrial applications and are widely used in textile manufacturing, but are not commonly used for coaxial fiber production, especially with the large experimental scales that are difficult to replicate in a standard liquid crystal research laboratory. We therefore propose a method for wet-spinning coaxial core-sheath liquid crystal-filled elastomer fibers using a microfluidic set-up. Based on the flow-focusing method used for the production of liquid crystal shells and emulsions, this technique generates coaxial filaments by pumping a core-sheath flow of a liquid crystal surrounded by a rubbery polymer solution into a co-flowing coagulation bath. The coagulation bath is tuned to quickly extract the elastic polymer solution solvent, leaving behind a dry, continuous fiber. We have employed this method to produce fibers of polybutadiene and polyisoprene containing a core of a liquid crystal, such as 4-cyano-4'-pentylbiphenyl (5CB). Investigations into the choice of polymer solution, i.e. both the polymer and solvents used, will be presented in addition to discussion on parameters affecting the contiguity of the core. [less ▲]

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