References of "Unpublished conference"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailAdversarial Embedding: A robust and elusive Steganography and Watermarking technique
Ghamizi, Salah UL; Cordy, Maxime UL; Papadakis, Mike UL et al

Scientific Conference (2020)

We propose adversarial embedding, a new steganography and watermarking technique that embeds secret information within images. The key idea of our method is to use deep neural networks for image ... [more ▼]

We propose adversarial embedding, a new steganography and watermarking technique that embeds secret information within images. The key idea of our method is to use deep neural networks for image classification and adversarial attacks to embed secret information within images. Thus, we use the attacks to embed an encoding of the message within images and the related deep neural network outputs to extract it. The key properties of adversarial attacks (invisible perturbations, nontransferability, resilience to tampering) offer guarantees regarding the confidentiality and the integrity of the hidden messages. We empirically evaluate adversarial embedding using more than 100 models and 1,000 messages. Our results confirm that our embedding passes unnoticed by both humans and steganalysis methods, while at the same time impedes illicit retrieval of the message (less than 13% recovery rate when the interceptor has some knowledge about our model), and is resilient to soft and (to some extent) aggressive image tampering (up to 100% recovery rate under jpeg compression). We further develop our method by proposing a new type of adversarial attack which improves the embedding density (amount of hidden information) of our method to up to 10 bits per pixel. [less ▲]

Detailed reference viewed: 414 (43 UL)
Full Text
Peer Reviewed
See detailA performance evaluation of weight-constrained conditioned portfolio optimization
Schiltz, Jang UL; Boissaux, Marc UL

Scientific Conference (2019, December 20)

Detailed reference viewed: 44 (0 UL)
Full Text
See detailFrom home to early childhood education: beliefs, language ideologies and OPOL
Kirsch, Claudine UL

Scientific Conference (2019, December 18)

Detailed reference viewed: 148 (2 UL)
Full Text
See detailHome literacy environment and family language policy of immigrant families in Luxembourg
Aleksic, Gabrijela UL; Bebic, Dzoen Dominique UL

Scientific Conference (2019, December 18)

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic ... [more ▼]

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic multilingualism, assuring cross-linguistic transfer and developing identities. To explore home literacy environment and family language policy of language minority preschool children in Luxembourg, we obtained 603 parent questionnaires, tested 226 children age 4 to 6 in their home languages and Luxembourgish, and interviewed 31 families. The results from the questionnaires showed that the home resources and parent involvement influenced children’s language awareness and their print knowledge irrespective of parent’s education and their wealth. Concerning children’s competences in Luxembourgish, children with positive attitudes towards their school did better than their peers in other schools. In the interviews, parents explained that maintaining home language is important for keeping connections with family, friends and their culture. This is the language parents feel emotionally connected to and the easiest to transmit to their children. Language maintenance is mostly achieved through conversations, movies, games and books in the home languages, children’s attendance of language schools on weekends, celebrations of traditions as well as holidays in the native country of the parents. The home language is, however, not something parents enforce too strictly, as they mostly correct the children’s linguistic mistakes by simple repetition. It is often with great pride that parents report their children having an excellent proficiency in their home language. Finally, through our professional development training in translanguaging we are helping teachers to integrate children’s different home languages and cultures into the classroom and strengthen the home-school collaboration in order to support children’s well-being, learning and identities. [less ▲]

Detailed reference viewed: 94 (8 UL)
Peer Reviewed
See detailAnomaly or Risk Factor? Some Simple Tests
Holcblat, Benjamin UL; Lioui, Abraham; Weber, Michael

Scientific Conference (2019, December 16)

Detailed reference viewed: 15 (0 UL)
See detailUnderstanding Alpha Decay
Penasse, Julien UL

Scientific Conference (2019, December 16)

Detailed reference viewed: 12 (0 UL)
Full Text
Peer Reviewed
See detailA professional development course in translanguaging: Teachers’ stance, design, and shifts
Aleksic, Gabrijela UL

Scientific Conference (2019, December 14)

The school population in Luxembourg is highly socially, culturally, and linguistically diverse. The new law in 2017 has declared multilingual early education mandatory, with the focus not only on the ... [more ▼]

The school population in Luxembourg is highly socially, culturally, and linguistically diverse. The new law in 2017 has declared multilingual early education mandatory, with the focus not only on the development of Luxemburgish, but also familiarizing children with French and valuing their home languages. Thus, our project aims to: (1) offer a professional development (PD) course in translanguaging to preschool teachers, (2) involve children’s families to reinforce home-school collaboration, and (3) foster children’s cognitive, linguistic, and socio-emotional engagement in the classroom. With teachers, we use focus groups, questionnaires, and language portraits, with parents, we employ questionnaires and interviews, and with children, a test in early literacy and numeracy in school and home language and video observations. Translanguaging is the use of a full linguistic repertoire to make meaning (Otheguy, García, & Reid, 2015). Translanguaging pedagogy is the main topic of our 22 hour PD course (June – December 2019) for 40 teachers. In the focus groups, the teachers shared their negative translanguaging stance towards the use of children’s home languages in the classroom, convinced that it hindered the development of Luxembourgish. Teachers, however, in some instances incorporated a translanguaging design (e.g. multilingual stories, morning greetings) and translanguaging shift (e.g. translations by older children). The project addresses these negative translanguaging stances through practical activities and a close collaboration with parents, children and organisational stakeholders. The preliminary results from parent questionnaires and tests with children will provide a bigger picture of the effect of translanguaging pedagogy from our PD course on all the actors involved. References Otheguy, R., García, O., & Reid, W. (2015). Clarifying translanguaging and deconstructing named languages: A perspective from linguistics. Applied Linguistic Review, 6(3), 281–307. [less ▲]

Detailed reference viewed: 123 (8 UL)
Peer Reviewed
See detailYoung emergent multilingual children's agency in learning new language in trilingual Luxembourg
Mortini, Simone UL

Scientific Conference (2019, December 14)

Studies on translanguaging suggest that opportunities to use languages flexibly in the classroom may give children some agency over their language use and facilitate their language learning (García ... [more ▼]

Studies on translanguaging suggest that opportunities to use languages flexibly in the classroom may give children some agency over their language use and facilitate their language learning (García & Kleifgen, 2010). In the emerging field of preschool bilingual education, scholars investigate the concept of child agency in relation to the learning of multiple languages (Schwartz, 2018). Children were shown to actively and creatively contribute to their language learning through choosing to interact in a particular language. Studies on young children’s translanguaging and agency nevertheless remain scarce, especially in multilingual contexts involving more than two languages (Schwartz et al., forthcoming). The present study focuses on eight children’s agentive behaviour in multilingual practices in two formal and two non-formal early childhood education institutions participating in a larger longitudinal research project on the development of multilingual pedagogies in trilingual Luxembourg. I drew on multidimensional qualitative research methods, including 65 days of participant observations, fieldnotes, video-recordings and semi-structured interviews with the practitioners. The findings show that all the children made use of various non-linguistic strategies and at least four named languages and translanguaged for various purposes (e.g. demonstrating knowledge, meaning making). Moreover, they showed two types of agentive behaviour: ‘participatory agency’ (e.g. adapting learning to practitioners’ requirements) and ‘controlling agency’ (e.g. influencing or changing peers’ or practitioners’ language use). The findings should deepen our understanding of the interplay between agency and translanguaging. García, O., & Kleifgen, J. (2010). Educating Emergent Bilinguals. Policies, Programs and Practices for English Language Learners. New York: Teachers College Press. Schwartz, M. (2018). Preschool Bilingual Education: Agency in Interactions between Children, Teachers, and Parents. Dordrecht: Springer. Schwartz, M., Kirsch, C., & Mortini, S. (forthcoming). Young children’s language-based agency in multilingual contexts in Luxembourg and Israel. (Applied Linguistic Review). Manuscript accepted for publication. [less ▲]

Detailed reference viewed: 37 (2 UL)
Full Text
Peer Reviewed
See detailWhy is the Market Skewness-Return Relationship Negative?
Lehnert, Thorsten UL

Scientific Conference (2019, December 13)

Detailed reference viewed: 41 (4 UL)
Full Text
See detailUsing the Vertical Land Movement estimates from the IGS TIGA combined solution to derive Global Mean Sea Level changes
Bogusz, Janusz; Hunegnaw, Addisu UL; Teferle, Felix Norman UL et al

Scientific Conference (2019, December 13)

Global mean sea level (GMSL) is now widely recognized to have risen between 1 to 2 mm/yr depending on location since the 20th century. Prior to the satellite altimetry era, GMSL was primarily estimated ... [more ▼]

Global mean sea level (GMSL) is now widely recognized to have risen between 1 to 2 mm/yr depending on location since the 20th century. Prior to the satellite altimetry era, GMSL was primarily estimated from a set of secular tide gauge records relative to coastal benchmarks. Recent measurements of GPS (Global Positioning System) have been demonstrated as a useful tool of a direct estimate of Vertical Land Motion (VLM) induced by both long and short-term geophysical and human-induced processes in a geocentric reference frame. This presentation will provide the results of a combination performed using the CATREF software of three independent GPS daily solutions provided by British Isles continuous GNSS Facility – University of Luxembourg consortium (BLT), German Research Centre for Geosciences (GFZ) and University of La Rochelle (ULR) under the auspices of the Tide Gauge Benchmark Monitoring (TIGA) Working Group (WG), that results in a spatially comprehensive map of VLM near or close to tide gauge benchmarks. The combination was performed in accordance with the second re-processing campaign (repro2) of the IGS (International GNSS Service). Long coastal tide gauge records from the archives maintained at the Permanent Service for Mean Sea Level (PSMSL) were extracted for relative sea level estimates. To cross-compare the sea level rates over the years, we employed observations between 1900-2016. Then, the time series were cut and analyzed separately, ceteris paribus, for the period 1960-2016. This analysis was aimed at a cross-comparison of relative sea level trends and their changes over the years. The stochastic part of the tide gauge records was analyzed with Maximum Likelihood Estimation (MLE) and assumed several different combinations of noise models with the Bayesian Information Criterion (BIC) providing a means to identify the preferred one. The relative sea level estimates were corrected by the inverted barometric effect to the tide-gauge records using data from the 20th century Reanalysis project version V2C, the effect of wind stress on the surface of the ocean in both, zonal and meridional components, as well as Pacific Decadal Oscillation (PDO) and the North Pacific Gyre Oscillation (NPGO) influencing Pacific tide gauge records. The GPS-based velocities were corrected by Glacial Isostatic Adjustment (GIA) effect using ICE-6G(VM5a) model with associated geoid rate and post seismic decays using ITRF2014 estimates. Also, environmental loading models were employed to account for present-day elastic loading in VLM. The Mean Sea Level (MSL) trends from tide gauges and VLM-corrected MSL trends using GIA model (TG+GIA) and the TIGA combination (TG+TIGA) were determined. Our final reconstruction of GMSL based on the MSL records from 1900 to 2016 where the VLM uncertainty is smaller than 0.7 mm/yr indicate a long-term trend of 1.75 +/- 0.2 mm/yr and is in good agreement with several similar determinations. [less ▲]

Detailed reference viewed: 74 (1 UL)
Full Text
See detailConventional EO Satellites vs. CubeSats; FDL - AI flood detection onboard a Nano Satellite
Backes, Dietmar UL; Schumann, Guy; Teferle, Felix Norman UL

Scientific Conference (2019, December 11)

Detailed reference viewed: 65 (2 UL)
Full Text
See detailHydrogeological effects on terrestrial gravity measurements
Van Camp, Michel; de Viron, Olivier; Dassargues, Alain et al

Scientific Conference (2019, December 10)

For the 20 last years, terrestrial and satellite gravity measurements have reached such a precision that they allow for identification of the signatures from water storage fluctuations. In particular ... [more ▼]

For the 20 last years, terrestrial and satellite gravity measurements have reached such a precision that they allow for identification of the signatures from water storage fluctuations. In particular, hydrogeological effects induce significant time-correlated signature in the gravity time series. Gravity response to rainfall is a complex function of the local geologic and climatic conditions, e.g., rock porosity, vegetation, evaporation, and runoff rates. The gravity signal combines contributions from many geophysical processes, source separation being a major challenge. At the local scale and short-term, the associated gravimetric signatures often exceed the tectonic and GIA effects, and monitoring gravity changes is a source of information on local groundwater mass balance, and contributes to model calibrations. Some aquifer main characteristics can then be inferred by combining continuous gravity, geophysical and hydrogeological measurements. In Membach, Belgium, a superconducting gravimeter has monitored gravity continuously for more than 24 years. This long time series, together with 300 repeated absolute gravity measurements and environmental monitoring, has provided valuable information on the instrumental, metrological, hydrogeological and geophysical points of view. This has allowed separating the signal sources and monitoring partial saturation dynamics in the unsaturated zone, convective precipitation and evapotranspiration at a scale of up to 1 km², for signals smaller than 1 nm/s², equivalent to 2.5 mm of water. Based on this experience, another superconducting gravimeter was installed in 2014 in the karst zone of Rochefort, Belgium. In a karst area, where the vadose zone is usually thicker than in other contexts, combining gravity measurements at the surface and inside accessible caves is a way to separate the contribution from the unsaturated zone lying between the two instruments, from the saturated zone underneath the cave, and the common mode effects from the atmosphere or other regional processes. Those experiments contribute to the assessment of the terrestrial hydrological cycle, which is a major challenge of the geosciences associated with key societal issues: availability of freshwater, mitigation of flood hazards, or measurement of evapotranspiration. [less ▲]

Detailed reference viewed: 86 (4 UL)
Full Text
See detailAbsolute Gravity and Uplift in the Yellowstone Caldera
van Dam, Tonie UL; Francis, Olivier UL

Scientific Conference (2019, December 10)

GPS time-series of uplift show that points in and around the caldera have gone through cycles of uplift, followed by subsidence since observations began about three decades ago. A dramatic increase in the ... [more ▼]

GPS time-series of uplift show that points in and around the caldera have gone through cycles of uplift, followed by subsidence since observations began about three decades ago. A dramatic increase in the uplift rate started in 2004 at the GPS station LKWY near Yellowstone Lake and Old Faithful, OFWY. Since 2010, the sites have subsided, began uplifting again in 2014 coincidentally after a M 4.8 earthquake near the Norris Geyser Basin, and then started subsiding again in 2016. The cause of the episodic uplift and subsidence and the spatial pattern of the surface displacement are not yet well understood. The 2003-2009 episode of rapid uplift is believed to result from deep source magma intrusion simultaneous with depressurization of the hydrothermal systems beneath the Norris Geyser Basin. But whether it is caused by the intrusion of magma from a distant reservoir, or by the expulsion and localized trapping of pressurized water and gas from rock that is already in-place, is not known. We have taken observations of absolute gravity at LKWY and OFWY almost annually since 2009. In this presentation, we compare gravity and uplift and provide some insight into the mechanism driving the uplift/subsidence cycles. [less ▲]

Detailed reference viewed: 118 (6 UL)
Full Text
See detailMechanical parameters identification of keloid and surrounding healthy skin using Digital Image Correlation measurements in vivo
Elouneg, Aflah; Sutula, Danas; Sensale, Marco UL et al

Scientific Conference (2019, December 09)

The human skin behaves as an elastic membrane initially prestressed but not uniformly. The presence of anatomical sites favorable to the appearance of some tumors, a keloid in our case, while other sites ... [more ▼]

The human skin behaves as an elastic membrane initially prestressed but not uniformly. The presence of anatomical sites favorable to the appearance of some tumors, a keloid in our case, while other sites never develop them attests to the importance of the mechanical environment of the tissue. Thus, a mechanical characterization of the tumored skin is necessary to understand the keloid expansion from a mechanical point of view. Our case study consists in modeling a bi-material structure composed of a keloid skin surrounded by healthy skin located on upper left arm of a young female. From the experimental measurements in vivo, by combining force sensor, displacement sensor and Digital Image Correlation techniques, we perform a mechanical analysis to characterize the mechanical stress fields over the entire area and on the interface ‘healthy skin/keloid skin’. Since the mechanical behavior of the tumorous skin is unknown, many physical models can be implemented and assessed very easily inside the specific digital software to fit with the real data. Once a set of mechanical parameters for both the healthy skin and the keloid skin are identified, the stress fields around the keloid are calculated. Next steps consist in determining matching preferential directions in order to define as precisely as possible the specifications of a device for preventing the growth of keloids. [less ▲]

Detailed reference viewed: 40 (3 UL)
Full Text
See detailParameter identification problem in bimaterial human skin and sensitivity analysis : Uncertainties in biomechanics of skin
Sutula, Danas; Elouneg, Aflah; Sensale, Marco UL et al

Scientific Conference (2019, December 09)

The proposed paper concerns the prediction of the numerical response of a biomechanical structure submitted to an unknown external loading state. The methodology is based on homogeneous and then ... [more ▼]

The proposed paper concerns the prediction of the numerical response of a biomechanical structure submitted to an unknown external loading state. The methodology is based on homogeneous and then heterogeneous structures such as healthy or pathological cutaneous tissues that can be mechanically tested in vivo under a patchy knowledge of boundary conditions. Experimental data corresponding to the extension of a piece of skin located between two pads with displacement enslavement, represent input data to the numerical model. Data are reaction force on one pad and displacement field between the two pads and all around. The numerical model consists of a representation of the bi-material domain geometry with neo-hookean behaviors. The boundary conditions and loadings of the experimental extension test are imposed. The materials parameters have been identified by inverse method starting from a constrained cost function minimizing the difference between the calculated displacements field and experimental displacements field obtained by digital image correlation and taking into account the reaction force as a constraint. An analysis of the model sensitivity to material parameters is presented. [less ▲]

Detailed reference viewed: 35 (0 UL)
Peer Reviewed
See detailPsychiatric knowledge dissimination at international conferences (1860-1914): 'those who have the interest of science at heart, don't distinguish between nationalities'
Andersen, Eva UL

Scientific Conference (2019, December 06)

The amount of international conferences that were organised over the nineteenth century increased rapidly, and formed an ideal environment for discussions amongst peers and establishing knowledge ... [more ▼]

The amount of international conferences that were organised over the nineteenth century increased rapidly, and formed an ideal environment for discussions amongst peers and establishing knowledge transfers. Medical and psychiatric conferences were no exception. However, a study into psychiatric conferences on a larger scale has not yet been conducted. Adopting a transnational perspective is essential, and while this approach is gaining more attention from historians more generally, it is only slowly reaching the history of psychiatry. To gain insights into the (inter)national knowledge dissemination that happened within psychiatry, we will examine different organisational aspects such as the locations where conferences were held, its organisation and the subjects and questions that were included in the conference program, as well as studying the mutual connections between congresses and the connections between the participants. This will help to discover the key players and whether it was well-known psychiatrists that were most involved in these international conferences. These interwoven sub-questions will help to establish in how far an international community existed within psychiatry and thus if such international congresses were an epicentre of transnational knowledge dissemination or if they were rather a manifestation of national encounters. This research is based on the minutes and membership lists found within conference proceedings of the “Congrès internationale médecine mentale”, “Congrès international de neurologie, psychiatrie et de physiologie”, “Congrès international de l’assistance aux aliéné” and the “Congrès international de médecine” that also often included a section dedicated to psychiatry. These all took place between the 1860’s and the first decade of the twentieth century. [less ▲]

Detailed reference viewed: 52 (2 UL)
Peer Reviewed
See detailScaling of urban heat island & NO2 with urban population: a meta-analysis
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2019, December 05)

Detailed reference viewed: 140 (14 UL)
Peer Reviewed
See detailAccommodation of non-nationals in Luxembourg
Wronska, Iwona; Murdock, Elke UL

Scientific Conference (2019, December 05)

The Grand Duchy of Luxembourg within its current borders was established in the end of 19th century. In the space of less than 150 years the population of this state more than doubled - largely ... [more ▼]

The Grand Duchy of Luxembourg within its current borders was established in the end of 19th century. In the space of less than 150 years the population of this state more than doubled - largely attributable to immigration. Today, 48% of the population are foreigners. We would like to argue that the current immigration policy of Luxembourg is based on the strategy of accommodation. We can identify three major pillars of this strategy. The first pillar creates welcome conditions to adaptation within the host society. The second pillar brings liberal provisions for naturalization and the third pillar offers open and generous admission of refugees. [less ▲]

Detailed reference viewed: 61 (2 UL)
Full Text
Peer Reviewed
See detailMachine learning for physical-layer security: Attacks and SLP Countermeasures for Multiantenna Downlink Systems
Mayouche, Abderrahmane UL; Spano, Danilo; Tsinos, Christos UL et al

Scientific Conference (2019, December)

Most physical-layer security (PLS) work employ information theoretic metrics for performance analysis. In this paper, however, we investigate PLS from a signal processing point of view, where we rely on ... [more ▼]

Most physical-layer security (PLS) work employ information theoretic metrics for performance analysis. In this paper, however, we investigate PLS from a signal processing point of view, where we rely on bit-error rate (BER) at the eavesdropper (Eve) as a metric for information leakage. Meanwhile, recently, symbol-level precoding (SLP) has been shown to provide PLS gains as a new way for security. However, in this work, we introduce a machine learning (ML) based attack, where we show that even SLP schemes can be vulnerable to such attacks. Namely, this attack manifests when an eavesdropper (Eve) utilizes ML in order to learn the precoding pattern when precoded pilots are sent. With this ability, an Eve can decode data with favorable accuracy. As a countermeasure to this attack, we propose a novel precoding design. The proposed countermeasure yields high BER at the Eve, which makes symbol detection practically infeasible for the latter, thus providing physical-layer security between the base station (BS) and the users. In the numerical results, we validate both the attack and the countermeasure, and show that this gain in security can be achieved at the expense of only a small additional power consumption at the transmitter. [less ▲]

Detailed reference viewed: 142 (14 UL)
Full Text
Peer Reviewed
See detailIncidental Video-Based Foreign Language Learning in Young Children: A Pilot Study in Home Settings
Nosbusch, Charline; Reuter, Robert UL

Scientific Conference (2019, November 29)

In the present pilot study, we explore in how far a self-developed video-based app could lead to incidental foreign language learning in young children with a migration background. Four children (3-7 ... [more ▼]

In the present pilot study, we explore in how far a self-developed video-based app could lead to incidental foreign language learning in young children with a migration background. Four children (3-7 years old; 2 boys, 2 girls) participated in the study together with their parents. Pre- and post-intervention language skills tests were used to quantify their language proficiencies; interviews with the children and their parents were used to get a grasp of how engaging the learning app was for the children and in how far the children transferred what they heard in the videos to everyday life situations. Results suggest that the use of the app did lead to increases in language skills and that it was engaging and extended beyond the concrete exposure phase. Incidental foreign language learning using mobile video apps should be further explored as a promising tool to prepare minority children for formal language learning. [less ▲]

Detailed reference viewed: 45 (4 UL)
Full Text
Peer Reviewed
See detailLa (non) violence en mots et en gestes : Partage de midi de Paul Claudel, mise en scène d'Yves Beaunesne (Comédie-Française, 2007 et Théâtre Marigny, 2009)
Deregnoncourt, Marine UL

Scientific Conference (2019, November 29)

Pour tenter de correspondre au mieux au propos de ce colloque intitulé : « Le geste sur les scènes des XXe et XXIe siècles : entre tradition et innovation théâtrales », nous nous proposons d’analyser ... [more ▼]

Pour tenter de correspondre au mieux au propos de ce colloque intitulé : « Le geste sur les scènes des XXe et XXIe siècles : entre tradition et innovation théâtrales », nous nous proposons d’analyser comment, au sein de la mise en scène d’Yves Beaunesne de Partage de midi de Paul Claudel, le geste actorial vient contrecarrer les paroles énoncées. Nous nous attarderons plus spécifiquement sur la scène d’amour entre Ysé et Mesa, protagonistes phares du drame claudélien (Acte II, Scène 2). En effet, la crudité et la violence langagières se voient, au cours d’une danse contemporaine, atténuées par les gestes tendres, sensuels et complices de Marina Hands et Éric Ruf, interprètes des rôles - titre susmentionnés. Comment un tel oxymore scénique peut-il se produire ? C’est précisément à cette problématique que notre communication entend se consacrer. Pour ce faire, notre réflexion se divisera en deux parties. La première s’axera davantage sur les didascalies claudéliennes pour tenter de mettre au jour la violence passionnelle. La seconde partie concernera l’interprétation actoriale de cette scène d’amour singulière. [less ▲]

Detailed reference viewed: 66 (1 UL)
Full Text
Peer Reviewed
See detailDreaming of Constructivist Technology Integration Strategies in Future Teacher Students
Reuter, Robert UL; Busana, Gilbert UL

Scientific Conference (2019, November 27)

Based on previous experiences in preparing future teachers for technology integration (Reuter & Busana, 2017), and based on the recommendations from Kolb’s (2017) Triple E framework about effective uses ... [more ▼]

Based on previous experiences in preparing future teachers for technology integration (Reuter & Busana, 2017), and based on the recommendations from Kolb’s (2017) Triple E framework about effective uses of ICT in education, we have adapted the Educational Technology course in our Initial Teacher Training. Over the years, we have indeed observed that, when given the choice of the type of technology integration strategies, many students designed ICT-based learning and teaching scenarios that implemented a rather teacher-centred teaching model (Roblyer & Doering, 2013). These scenarios were often far from innovative nor did they implement the disruptive potential of ICT in education (Christensen, Horn & Johnson, 2008). In the winter semester 2018-2019 we thus decided to ask our students to design and develop constructivist technology integration scenarios. We assessed the success of this adaptation with the help of our own observations, the semester reports produced by our students and their answers to an end-of-semester course evaluation. In general, we saw that students were able to design rather attractive constructivist learning activities. We also observed that our students were quite surprised that such activities do not require complicated and expensive tools, but that they can be implemented with standard productivity tools. [less ▲]

Detailed reference viewed: 127 (14 UL)
Full Text
See detailA professional development course in translanguaging: Challenges and opportunities
Aleksic, Gabrijela UL; Dzoen, Bebic-Crestany

Scientific Conference (2019, November 27)

In Luxembourg, the new law in 2017 has declared multilingual early education mandatory. Not only that teachers need to help children develop their Luxembourgish, but also they need to familiarize them ... [more ▼]

In Luxembourg, the new law in 2017 has declared multilingual early education mandatory. Not only that teachers need to help children develop their Luxembourgish, but also they need to familiarize them with French and value their home languages. In order to support preschool teachers in this endeavour, our project aims to: (1) offer a professional development (PD) course in translanguaging, (2) involve children’s families to reinforce home-school collaboration, and (3) foster children’s cognitive, linguistic, and socio-emotional engagement in the classroom. We use a panoply of measures to reach our aims: focus groups and teacher questionnaires (aim 1), parent questionnaires and interviews (aim 2), a test in early literacy and numeracy in school and home languages, teacher assessment of children’s socio-emotional development and video observations with children (aim 3). Translanguaging, the main topic of our 22 hour PD course (June – December 2019), is the use of a full linguistic repertoire to make meaning (Otheguy, García, & Reid, 2015). In eight sessions, we explore multilingual ecology, parental involvement, and oracy and early literacy. We will present preliminary findings of the focus groups with teachers and tests in early literacy and numeracy in children’s home and school languages. Challenges and opportunities that emerged during the course will be explored as well. [less ▲]

Detailed reference viewed: 108 (3 UL)
Full Text
See detailDeveloping Multilingual Pedagogies in Early Childhood: a review of the project MuLiPEC
Aleksic, Claudine UL; Aleksic, Gabrijela UL; Mortini, Simone UL et al

Scientific Conference (2019, November 27)

Developing Multilingual Pedagogies in Early Childhood: a review of the project The project MuLiPEC (2016-2019) addresses the need for multilingual pedagogies in early childhood education in Luxembourg. It ... [more ▼]

Developing Multilingual Pedagogies in Early Childhood: a review of the project The project MuLiPEC (2016-2019) addresses the need for multilingual pedagogies in early childhood education in Luxembourg. It offered a professional development (PD) course to develop the practitioners’ knowledge and skills in relation to multilingualism and effective pedagogies as well as their practices, and analysed the effects of the PD on the practitioners and the children’s languaging. We offered a first 15-hour course to 46 practitioners from formal and non-formal education settings. Of these, seven continued during one academic year. They were coached and took part in six network meetings where we discussed their practices. To analyse the results, we drew on observations of the PD and in the research settings, video-recorded activities, and interviews. The results show that all 46 participants opened up to multilingual education and deepened their understanding of multilingualism, language development and multilingual pedagogies. Furthermore, the seven focus practitioners implemented activities in multiple languages and deployed effective language supportive strategies. Five of them developed holistic and child-centred multilingual pedagogies. This paper presents these positive findings and raises questions related to the sustainability of PD course and the need to continue the implementation of these effective pedagogies. [less ▲]

Detailed reference viewed: 98 (5 UL)
Full Text
Peer Reviewed
See detailAu-delà du cours magistral: Vers des apprentissages autonomes et collaboratifs basés sur de « grandes questions »
Busana, Gilbert UL; Reuter, Robert UL

Scientific Conference (2019, November 22)

Nous enseignions depuis quelques années un cours de première année sur "l'éducation à l'ère numérique", dans la formation initiale des futur-e-s enseignant-e-s du fondamental, sous forme d’un cours ... [more ▼]

Nous enseignions depuis quelques années un cours de première année sur "l'éducation à l'ère numérique", dans la formation initiale des futur-e-s enseignant-e-s du fondamental, sous forme d’un cours magistral afin de véhiculer certaines connaissances théoriques et pratiques dans ce domaine. Cependant, nous avons observé au cours des dernières années que (1) de nombreux étudiants échouaient à l'examen et que (2) beaucoup d'entre eux, lorsqu'ils étaient en 4e année, avaient oublié la plupart des fondements. Ces considérations nous ont amenés à repenser et à remanier nos méthodes d'enseignement et notre façon d'évaluer les résultats d'apprentissage des étudiant-e-s. Après une première implémentation de notre nouvelle approche pédagogique combinant diverses méthodes actives d'apprentissage au semestre d’hiver 2018 (décrite et réfléchie dans Reuter & Busana, 2018), nous avons effectué quelques modifications basées (a) sur nos propres observations et réflexions ainsi que (b) sur les commentaires des étudiant-e-s tirées de l’évaluation du cours (organisée par notre université). Dès à présent, plutôt que de les faire travailler sur de « grandes questions » (c.-à-d. des questions pour lesquelles il n'y a pas de réponses simples et faciles à consulter) au cours des séances en présentiel, nous demandons maintenant à nos étudiant-e-s (1) de construire individuellement des connaissances en amont du séminaire sur base de ressources fournies ou tirés de recherches bibliographiques autonomes ; (2) de les présenter, discuter et développer de manière collaborative en petits groupes pendant les séminaires ; puis (3) de les partager et discuter avec nous et leurs pairs et finalement (4) de les conserver dans un portfolio numérique personnel. L’évaluation des apprentissages des étudiant-e-s est effectuée à l’aide de ce portfolio numérique en fin de semestre. [less ▲]

Detailed reference viewed: 145 (14 UL)
Peer Reviewed
See detailDie Entstehung einer Hauptstadtregion als deutsch-belgische Beziehungsgeschichte
Brüll, Christoph UL

Scientific Conference (2019, November 22)

Vom 14. Mai - 23. Juli und vom 19. September - 31.Oktober 1972 fand zunächst im Kölner Museum Schnütgen und dann in den Brüsseler Musées Royaux d’Art et d’Histoire die bis heute größte Schau rheinisch ... [more ▼]

Vom 14. Mai - 23. Juli und vom 19. September - 31.Oktober 1972 fand zunächst im Kölner Museum Schnütgen und dann in den Brüsseler Musées Royaux d’Art et d’Histoire die bis heute größte Schau rheinisch-maasländischer Kunst statt. Unter dem Titel „Rhein und Maas. Kunst und Kultur 800-1400“ wurde sie zu einem großen Publikumserfolg, der auch in der Scientific Community der Kunsthistoriker einige Aufmerksamkeit erregte. Die Entstehung der Ausstellung sagt einiges über die Geschichte der Wissenschaftsbeziehungen zwischen Deutschland und Belgien seit 1945 aus, aber auch, so die Ausgangshypothese meines Beitrags, über die Veränderungen der in Belgien vorherrschenden Mental Maps von Deutschland seit der Verlagerung des politischen Schwerpunktes an den Rhein mit der Gründung der Bundesrepublik. Der belgische Deutschlanddiskurs knüpfte dabei durchaus an bereits bestehende Deutschlandbilder an, die gerade das Maasland als Zwischenraum inszenierten , doch kam durch das Zusammenrücken der westeuropäischen Länder im Zuge von Kaltem Krieg und beginnender europäischer Integration, gerade auch unter dem Signum des Abendlandes, eine neue Dimension ins Spiel. Mentalitätsgeschichtlich hob die rheinische Bonner Republik die durch den Ersten Weltkrieg hervorgerufene Distanz zwischen dem belgischen Staat und (West-)Deutschland auf, politikgeschichtlich fanden deutsche und belgische „Suche nach Sicherheit“ (E. Conze) ein enges Kooperationsfeld. Zum Zentrum der belgischen Aktivität im Rheinland wurde Köln, das nach dem durch die Wahl als Regierungssitz notwendig gewordenen Verlassen Bonns durch die belgischen Truppen in Deutschland 1950 zu deren neuem Hauptquartier wurde. Dort etablierte sich zudem rasch das Belgische Haus als Drehscheibe für politischen, konsularischen, aber auch kulturellen Austausch. Die Ausstellung „Rhein und Maas“ dient als Aufhänger für den Beitrag, der sowohl das Ende einer langen Nachkriegszeit als auch das Ankommen Belgiens in der Bonner Republik herausstellen kann. Auch die Anfang der 1970er Jahre erfolgten ersten gegenseitigen Staatsbesuche geben Aufschluss über Inszenierung und Wahrnehmung der Hauptstadtregion. Der Beitrag wirft somit eine beziehungsgeschichtliche Perspektive auf Bonn-Köln-Düsseldorf zwischen 1949 und den 1970er Jahren und fragt mit Bezug auf die Hauptstadtregion auf die belgische(n) Wahrnehmung(en) des Rheinischen, aber auch nach Rückwirkungen auf Brüssel als belgischer und europäischer Hauptstadt. [less ▲]

Detailed reference viewed: 108 (0 UL)
Full Text
Peer Reviewed
See detailMono-static Automotive Joint Radar-Communications System
Dokhanchi, Sayed Hossein UL; Ottersten, Björn UL

Scientific Conference (2019, November 21)

Detailed reference viewed: 97 (3 UL)
Full Text
See detailOral History as a multimedia and multidimensional presentation challenge
Lambert, Douglas UL

Scientific Conference (2019, November 13)

Oral History is a multidisciplinary, multinational field based on a format of recorded, usually sit-down interviews, where the past is documented through personal narratives of life experience. In the ... [more ▼]

Oral History is a multidisciplinary, multinational field based on a format of recorded, usually sit-down interviews, where the past is documented through personal narratives of life experience. In the early 2000’s, a new approach to processing and managing oral histories was introduced based on timecode indexing made possible by software environments. This work can be referred to as Oral History Digital Indexing (OHDI), and it represents a suite of activities, tools, methods, and interfaces that have made oral histories more accessible both with and without transcripts, whilst reconnecting navigable text to original recordings for listening and watching. OHDI allows for oral history to be represented in visual, dynamic forms far more palatable to users than the previous default--a collection of transcripts. Pioneering OHDI work was done by Michael Frisch and The Randforce Associates, with whom the author worked with on a number of consulting projects between 2002 and 2018. The focus of these projects was distinctly on comprehensive timecode indexing, the use of annotation as an alternative to word-for-word transcription, and deployment of custom controlled vocabularies (CVs) organized visually as a spatially-meaningful content map. These CVs function like back-of-the-book term indexes providing better “front end” user access, but they have they also been adapted for research applications to organize sets of qualitative analysis codes. Through a post-doctoral research position at the University of Luxembourg, the author is introducing and integrating these OHDI methods into oral history development plans in Luxembourg. Several representative tools, interfaces, and CVs used to make oral histories more multimedia and multidimensional will be presented, all of which will be influential to the in-development “Luxembourgish Oral History Initiative.” [less ▲]

Detailed reference viewed: 46 (4 UL)
Peer Reviewed
See detailThe 2004 Afghan Constitution and Islam Merits and Challenges
Al Hajjaji, Shams Al Din UL

Scientific Conference (2019, November 11)

Detailed reference viewed: 82 (0 UL)
Full Text
Peer Reviewed
See detailWorkplace bullying exposure and subjective well-being – The mediating role of the frustration of the need for relatedness. A longitudinal six-wave study
Sischka, Philipp UL; Steffgen, Georges UL

Scientific Conference (2019, November 08)

Workplace bullying is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior. Drawing on self-determination theory, we propose that bullying ... [more ▼]

Workplace bullying is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior. Drawing on self-determination theory, we propose that bullying exposure thwarts employee’s need for relatedness with the result of decreased well-being. Studies examining these mechanisms used either a cross-sectional design (Trépanier et al., 2013) or a longitudinal design with (not theoretically justified) long time intervals (i.e., 12-month time lag; Trépanier et al., 2015). Therefore, the aim of our study was to test this mediation in a longitudinal design with much shorter time intervals (i.e. monthly), whether to see if the bullying exposure also shows short-term effects on well-being. A six-wave online survey design with monthly time lag was employed and data were collected among U.S. employees. The sample consists of 1,595 respondents (55.8% females, n=890, ageM = 36.9, ageSD =10.3). Workplace bullying exposure was assessed with the S-NAQ (Notelaers et al., 2018), frustration of the need for relatedness with the Psychological Needs Thwarting Scale (Bartholomew et al., 2011) and well-being with the WHO-5 well-being-index (Topp et al., 2015). Cross-lagged mediation analysis within a structural equation modeling framework confirmed the mediation model: Bullying exposure was significantly related to a change in frustration of relatedness and frustration of relatedness was significantly related to a change in well-being across all waves. The study findings advance the field through showing that bullying exposure has not only a long-term effect on well-being but also a short one, and that this effect is mediated through the frustration of relatedness. [less ▲]

Detailed reference viewed: 61 (4 UL)
Peer Reviewed
See detailMath and Reading Difficulties in a Multilingual Educational Setting
Martini, Sophie Frédérique UL; Fischbach, Antoine UL; Ugen, Sonja UL

Scientific Conference (2019, November 06)

Detailed reference viewed: 74 (5 UL)
Peer Reviewed
See detailSimilarities and differences of value-added scores from models with different covariates: A cluster analysis
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, November 06)

Detailed reference viewed: 91 (8 UL)
Peer Reviewed
See detailNeed for Cognition across school tracks: The importance of learning environments
Colling, Joanne UL; Wollschläger, Rachel UL; Keller, Ulrich UL et al

Scientific Conference (2019, November 06)

Detailed reference viewed: 115 (9 UL)
See detailDimensional and Social Comparison Effects on Domain-Specific Academic Self-Concepts and Interests with First- and Third-Grade Students
van der Westhuizen, Lindie UL; Arens, Katrin; Keller, Ulrich UL et al

Scientific Conference (2019, November 06)

Academic self-concepts (ASCs) are self-perceptions of one’s own academic abilities. The internal/external frame of reference (I/E) model (Marsh, 1986) explains the formation of domain-specific ASCs ... [more ▼]

Academic self-concepts (ASCs) are self-perceptions of one’s own academic abilities. The internal/external frame of reference (I/E) model (Marsh, 1986) explains the formation of domain-specific ASCs through a combination of social (i.e. comparing one’s achievement in one domain with the achievement of others in the same domain) and dimensional (i.e. comparing one’s achievement in one domain with one’s achievement in another domain) comparisons. This results into positive achievement-self-concept relations within the math and verbal domains, but into negative achievement-self-concept relations across these domains. The generalized internal/external frame of reference (GI/E) model (Möller, Müller-Kalthoff, Helm, Nagy, & Marsh, 2015) extends the I/E model to the formation of other domain-specific academic self-beliefs such as interest. Research on the validity of the (G)I/E model for elementary school children is limited, especially for first-graders. This study examined the associations between verbal and math achievement and corresponding domain-specific self-concepts and interests for first-graders and third-graders. Two fully representative Luxembourgish first-grader cohorts and two fully representative third-graders cohorts (N=21,192) were used. The analyses were based on structural equation modeling. The findings fully supported the (G)I/E model for third-graders: Achievement was positively related to self-concept and interest within matching domains. Negative relations were found between achievement and self-concept and between achievement and interest across domains. For first-graders, achievement was positively related to self-concept and interest within matching domains. However, the majority of cross-domain relations were non-significant, except for the negative path between math achievement and verbal interest. Hence, while the formation of domain-specific ASCs and interests seem to rely on social and dimensional comparisons for third-graders, only social comparisons seem to be in operation for first-graders. Gender and cohort invariance was established for both grade levels. The findings are discussed within the framework of ASC differentiation and dimensional comparison theory applied to elementary school students. [less ▲]

Detailed reference viewed: 155 (8 UL)
Full Text
Peer Reviewed
See detailEnergy-efficient Trajectory Design for UAV-enabled Wireless Communications with Latency Constraints
Tran Dinh, Hieu UL; Vu, Thang Xuan UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, November 03)

This paper studies a new energy-efficient unmanned aerial vehicle (UAV)-enabled wireless communications, where the UAV acts as a flying base station (BS) to serve the ground users (GUs) within some ... [more ▼]

This paper studies a new energy-efficient unmanned aerial vehicle (UAV)-enabled wireless communications, where the UAV acts as a flying base station (BS) to serve the ground users (GUs) within some predetermined latency limitations, e.g., requested timeout (RT). Our goal is to design the UAV trajectory to minimize the total energy consumption while satisfying the RT requirement from every GU, which is accomplished via two consecutive subproblems: traveling time minimization and energy minimization problems. Firstly, we propose two exhaustive search and heuristic algorithms based on the traveling salesman problem with time window (TSPTW) in order to minimize the UAV’s traveling time without violating the GUs’ RT requirements. While the exhaustive algorithm achieves the best performance at a high computation cost, the heuristic algorithm achieves a trade-off between the performance and complexity. Secondly, we minimize the total energy consumption, for a given trajectory, via a joint optimization of the UAV’s velocity along subsequent hops. Finally, numerical results are presented to demonstrate the effectiveness of our proposed algorithms. In particular, it is shown that the proposed solutions outperform the reference in terms of both energy consumption and outage performance. [less ▲]

Detailed reference viewed: 104 (6 UL)
Full Text
Peer Reviewed
See detailActive Content Popularity Learning via Query-by-Committee for Edge Caching
Bommaraveni, Srikanth UL; Vu, Thang; Vuppala, Satyanarayana et al

Scientific Conference (2019, November 03)

Edge caching has received much attention as an effective solution to face the stringent latency requirements in 5G networks due to the proliferation of handset devices as well as data-hungry applications ... [more ▼]

Edge caching has received much attention as an effective solution to face the stringent latency requirements in 5G networks due to the proliferation of handset devices as well as data-hungry applications. One of the challenges in edge caching systems is to optimally cache strategic contents to maximize the percentage of total requests served by the edge caches. To enable the optimal caching strategy, we propose an Active Learning approach (AL) to learn and design an accurate content request prediction algorithm. Specifically, we use an AL based Query-by-committee (QBC) matrix completion algorithm with a strategy of querying the most informative missing entries of the content popularity matrix. The proposed AL framework leverage's the trade-off between exploration and exploitation of the network, and learn the user's preferences by posing queries or recommendations. Later, it exploits the known information to maximize the system performance. The effectiveness of proposed AL based QBC content learning algorithm is demonstrated via numerical results. [less ▲]

Detailed reference viewed: 70 (12 UL)
See detailVon Eupen-Malmedy nach Ostbelgien. Eine deutsch-belgische Beziehungsgeschichte seit 1920
Brüll, Christoph UL

Scientific Conference (2019, November 01)

Detailed reference viewed: 96 (1 UL)
Peer Reviewed
See detailEffectiveness of bullying intervention teams in German schools
Böhmer, Matthias UL; Franck, André; Schirra, Helmut et al

Scientific Conference (2019, November)

In recent years, bullying has increasingly been recognized as a widespread problem - also in the school context. Numerous examples illustrate that bullying at school is not an unfortunate individual case ... [more ▼]

In recent years, bullying has increasingly been recognized as a widespread problem - also in the school context. Numerous examples illustrate that bullying at school is not an unfortunate individual case, but is often part of everyday school life. Large-scale international comparative studies such as HBSC underline the high bullying prevalence rate and thus the relevance of the topic. According to these studies, classmates bully every sixth child in Germany several times a week. Teachers have a special responsibility in dealing with bullying. As a rule, they are at the center of the action and have the task of recognizing bullying in good time and of (re)acting quickly, decisively and reflectively. Since bullying is a complex phenomenon, professional action in this area poses a major challenge. For this reason, a program against bullying introduced in some federal states explicitly aims at teachers who are trained as bullying intervention teams on three days. Currently, we are systematically evaluating this program. In particular, we are interested in the extent to which the previous knowledge of teachers on the subject of mobbing is transformed by the program into consolidated knowledge relevant for acting and decision-making. In connection with the intervention of teachers in the case of bullying, there is (a) the expression of their expectation of self-efficacy, (b) the teaching climate, i.e. the social climate in teaching situations in a class, and (c) the experience and behavior of their students. We will present and discuss first results of the effectiveness of the program. [less ▲]

Detailed reference viewed: 125 (5 UL)
Full Text
Peer Reviewed
See detailFour Jewish stateless families between the millstones of Luxembourg authorities
Scuto, Denis UL; Bronec, Jakub UL

Scientific Conference (2019, November)

Our research, among others, attempts to find answers to the questions: How Luxembourg administration dealt with Jewish refugees who had lost their citizenship arriving to the Grand Duchy of Luxembourg ... [more ▼]

Our research, among others, attempts to find answers to the questions: How Luxembourg administration dealt with Jewish refugees who had lost their citizenship arriving to the Grand Duchy of Luxembourg from the East. Were there any particular differences between genders in the process of acceptance? Did Luxembourgish authorities distinguish or give priority to citizens of particular nations? [less ▲]

Detailed reference viewed: 51 (5 UL)
Full Text
Peer Reviewed
See detailTowards Dynamic Zero Emission Zone Management for Plug-in Hybrid Buses
Seredynski, Marcin UL; Viti, Francesco UL

Scientific Conference (2019, November)

Detailed reference viewed: 52 (8 UL)
Full Text
Peer Reviewed
See detailGraceful Interactions and Social Support as Motivational Design Strategies to Encourage Women in Exercising
Menheere, Daphne; Lallemand, Carine UL; Faber, Ilse et al

Scientific Conference (2019, November)

Increasingly aware of the importance of active lifestyles, many people intend to exercise more. Yet the main challenge remains to translate these intentions into action. Wearable devices supporting ... [more ▼]

Increasingly aware of the importance of active lifestyles, many people intend to exercise more. Yet the main challenge remains to translate these intentions into action. Wearable devices supporting exercise regrettably tend to adopt a one-size-fits-all approach by monitoring activity through quantified data as a motivation strategy. Since certain individuals are driven by social motives to exercise, less addressed through quantification, the impact of these devices on user experience and motivation is questionable. We contribute to the field by defining interaction attributes of graceful interactions in product design. We then embedded these in designing Grace, a piece of jewelry enabling women to share exercise intentions with friends to encourage social support. Instead of focusing on quantification, we rely on a qualitative approach using graceful interaction. Through this we extend the design space of sport-related wearables for women and inform how to design for exercise motivation through social support and graceful interactions. [less ▲]

Detailed reference viewed: 45 (0 UL)
Full Text
Peer Reviewed
See detailTeachers’ translanguaging stance, design, and shifts in a professional development course
Aleksic, Gabrijela UL; Bebic, Dzoen Dominique UL

Scientific Conference (2019, October 28)

Classrooms in Luxembourg are highly socially, culturally, and linguistically diverse. About 65% of 4 year-old children do not speak Luxembourgish, of which 28% speak Portuguese (MENJE, 2018). In 2017, the ... [more ▼]

Classrooms in Luxembourg are highly socially, culturally, and linguistically diverse. About 65% of 4 year-old children do not speak Luxembourgish, of which 28% speak Portuguese (MENJE, 2018). In 2017, the new law has declared multilingual early education mandatory. Until that time, the focus was solely on the development of Luxemburgish, whereas now teachers should also familiarize children with French and value their home languages. To support preschool teachers, our project aims to: (1) offer a professional development (PD) course in translanguaging, (2) involve children’s families to reinforce home-school collaboration, and (3) foster children’s cognitive, linguistic, and socio-emotional engagement in the classroom. We use focus groups, questionnaires, and language portraits with teachers and a test in early literacy and numeracy in school and home language and video observations with children. Translanguaging, the main topic of our 22 hour PD course (June – December 2019), is the use of a full linguistic repertoire to make meaning (Otheguy, García, & Reid, 2015). Through focus groups, we identified teachers’ negative translanguaging stance towards children’s proficiency in their home language that hinders the development of Luxembourgish. Translanguaging design was related to teachers’ use of multilingual stories and morning greetings, while translanguaging shifts concerned frequent translations by involving older children. Our main goal is to address the negative translanguaging stance by offering practical activities during the course and collaborating with parents, children, and organisational stakeholders. References Ministry of National Education, Childhood and Youth [MENJE]. (2018). Key numbers of the national education: statistics and indicators – School year 2016-2017. Retrieved from http://www.men.public.lu/fr/actualites/publications/themes-transversaux/statistiques-analyses/chiffres-cles/index.html Otheguy, R., García, O., & Reid, W. (2015). Clarifying translanguaging and deconstructing named languages: A perspective from linguistics. Applied Linguistic Review, 6(3), 281–307. [less ▲]

Detailed reference viewed: 248 (11 UL)
Peer Reviewed
See detailRebuilding the Office around the Mainframe: IBM’s S/360 in Context
van Herck, Sytze UL

Scientific Conference (2019, October 27)

The Oxford English Dictionary states that originally, a mainframe only defined the central processing unit and primary memory of a computer, whereas now a mainframe describes any large or general-purpose ... [more ▼]

The Oxford English Dictionary states that originally, a mainframe only defined the central processing unit and primary memory of a computer, whereas now a mainframe describes any large or general-purpose computer, specifically supporting numerous peripherals or subordinate computers. The IBM System/360, announced in 1964 and first installed at around 1967, consists of a collection of peripherals that can be connected to any central processing unit in the system family. Due to the size of both the individual components and the entire system, the design and layout of the office often needed to accommodate for the machine. Furthermore, “the experiences of weight, surface texture, sound and smell are part of the physicality of object” (Dannehl 2013, 130) so in order to experience the environment of a designated computer room, several museums have reconstructed at least some of the structure of a computer room. At the Living Computers Museum+Labs in Seattle the entrance to the separately airconditioned room is up a ramp, because of the raised floor that supports the weight of the computer and hides the very thick cables. Purchasing and installing an IBM System/360 required careful planning in terms of physical requirements and site selection, taking into account environmental, electrical, and signal factors. Besides the system and associated personnel, other furniture including storage cabinets, work tables, chairs, and desks also influenced planning. Furthermore, the length of the cables connecting the machines limited the distance between the system components. The schedule proposed by IBM encouraged customers to order six months before delivery and finalizing the layout two months later to allow for building alterations and time to process the cable order (IBM, 1975). Once the machine was installed, the dimensions and layout continuously influenced the workflow and working conditions of the users. Dannehl, Karin. 2013. “Object biographies. From production to consumption.” In History and Material Culture: A Student’s Guide to Approaching Alternative Sources, edited by Harvey, Karen, 123-138. Routledge. IBM System/360 Model 20 Installation Manual-Physical Planning. Systems Reference Library. Atlanta, Georgia: International Business Machines Corporation, 1975. Living Computers Museum+Labs, IBM, Box 1, 76027. [less ▲]

Detailed reference viewed: 59 (2 UL)
Full Text
Peer Reviewed
See detailFacing parallel inventions: the French telecommunications strategies in the digital field (mid-1950s to mid-1990s)
Schafer, Valerie UL

Scientific Conference (2019, October 26)

This panel on parallel inventions is an opportunity to rethink 15-years of research on data networks and digitization from the perspective of simultaneity. The subject of parallel inventions in the field ... [more ▼]

This panel on parallel inventions is an opportunity to rethink 15-years of research on data networks and digitization from the perspective of simultaneity. The subject of parallel inventions in the field of data networks immediately brings to mind the outset of packet switching, a key concept of Arpanet and Internet (Bay, 2019) that was developed in the 1960s by several players, namely Paul Baran at the RAND Corporation, Leonard Kleinrock at UCLA and Donald Davies at the NPL (National Physical Laboratory) in Great Britain. Yet this Zeitgeist surrounding packet switching is not the only example of parallel ideas and projects within the history of data networks, nor is it limited to the US context. My presentation therefore aims to shift the focus to deepen our understanding of simultaneous inventions, turning away from the cumbersome examination of the “great figures” towards collective innovation and adoption. To do so, we will look at the telecommunications sector. Since the 1950s, this sector in the United States, France, Great Britain and other European countries has been confronted with computer needs and the challenge of building data networks based on their infrastructure – communication lines were mainly monopolized by telecommunication companies in Europe until the end of the 1980s. Several parallel paths were experimented during the period from the transition to electronic switching in phone equipment to the development of standards such as X25, which competed with Internet protocols in the 1980s and 1990s, demonstrating that innovation is not a linear process. Rather than discuss AT&T’s hostility towards packet switching as implemented in Arpanet, which has already been well documented (Abbate, 1999), this study will look at the French telecommunications administration and show how those responsible for the communication lines needed for French networks were positioning themselves to face the changes that had begun in the 1950s, whilst assessing parallel inventions that were either internal or external to the administration. Our paper will therefore focus less on invention per se than on the response to simultaneous inventions, and will review several simultaneous paths in the history of digital networks that French telecommunications had to face, and the associated process of collective decision-making. We will start by presenting the parallel development of spatial and temporal switching in the second half of the 1950s, then look at the simultaneous experiment of Caducée and Hermès networks (early 1970s). Complementary case studies will cover the debate about virtual circuits and datagrams from the 1970s to the 1990s, standardization within the field of telematics and the first Web offers in the transition period from the Minitel to the Web in the 1990s. Our analysis aims to establish a typology of the administration’s choices and attitudes, which differ according to whether the alternative is an internal solution or from an external source, but also according to the periods, from the telecommunications monopoly to the 1990s deregulation. In this way, we aim to reveal how inventions were not only connected to the technical context and knowledge, but were also shaped by those who were interested in the resulting technology. [less ▲]

Detailed reference viewed: 98 (4 UL)
Full Text
Peer Reviewed
See detailInformation Content of Systematic and Idiosyncratic Risk Disclosure
Weber, Véronique UL; Muessig, Anke UL

Scientific Conference (2019, October 24)

Detailed reference viewed: 53 (2 UL)
See detailThe Occupied Museum. Culture and Science in Luxemburg during the Nazi Occupation, 1940–1944
Spirinelli, Fabio UL

Scientific Conference (2019, October 24)

Prior to the invasion of the Grand Duchy of Luxembourg by Nazi Germany on May 10, 1940, national research infrastructures were barely developed. A university did not exist. Research was mainly carried out ... [more ▼]

Prior to the invasion of the Grand Duchy of Luxembourg by Nazi Germany on May 10, 1940, national research infrastructures were barely developed. A university did not exist. Research was mainly carried out in the Grand-Ducal Institute, comparable to a scientific academy, and within the State Museum. During the occupation, the Germans introduced a civil administration and constitutional institutions were consequently abolished. Furthermore, the occupying power aimed at neutralizing French influence in Luxembourg while implementing a policy of ʻteutonizationʼ or ʻgermanizationʼ. From a National Socialist perspective, Luxembourg was considered a territory adherent to the German nation. Though the desired annexation of Luxembourg to the Third Reich did not happen, the measures implemented by the regime and the incorporation of the country into the Gau Moselland in February 1941 meant a de facto annexation. New policies implemented by the Nazi regime affected all spheres of social, cultural, and economic life. In the area of culture and science, plans were drafted to build new institutions or expand existing ones. Cultural and research societies were reorganised or disbanded. Theatres, libraries and museums became propaganda tools to diffuse and consolidate an official German culture. The state museum, renamed Landesmuseum during the occupation, expanded its collection and increased its staff. While the origins of objects and artefacts acquired during the occupation are not entirely clear, the museum strengthened its public role as a protector and conservator of cultural heritage. My paper aims at exploring how the occupation has shaped research in both sciences and humanities and their related institutions. A comparative view that considers other occupied countries and the Third Reich will be complemented by a case study related to the Landesmuseum during the four-year occupation. Three questions are at the core of the present contribution: How were the research infrastructures incorporated into the new administration? How did the museum adapt to and cope with a situation out of the ordinary? What worldview was to be disseminated to the general public and which particular elements of this worldview were disseminated through cultural and research institutions? My contribution takes into account the relationship between structures (both administrative and legislative), actors, and discourses. Additionally, specific difficulties related to the currently available primary sources will be dealt with and the ambiguous scientific relations between Germany and Luxembourg before the war will be examined. [less ▲]

Detailed reference viewed: 107 (7 UL)
Full Text
Peer Reviewed
See detailThe association between workplace bullying exposure and workplace bullying perpetration – The role of frustration of the need for relatedness
Sischka, Philipp UL; Steffgen, Georges UL

Scientific Conference (2019, October 24)

Workplace bullying (WB) is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior (Nielsen & Einarsen, 2012). WB is seen as an escalated ... [more ▼]

Workplace bullying (WB) is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior (Nielsen & Einarsen, 2012). WB is seen as an escalated conflict, where both parties engage in increasing overt acts of aggression (e.g., Einarsen et al., 2011). This perspective is supported by one of the most robust finding in WB and aggression literature, the association between experienced workplace aggression and enacting in workplace aggression (e.g., Baillien et al., 2016). However, there are only a few studies that have researched the mechanism between these phenomena (Samnani & Singh 2012). Self-determination theory (SDT) might explain this link. As need frustration is linked to less self-control (Vansteenkiste & Ryan, 2012), the frustration of the need for relatedness might also lead to increased aggressive behavior. Drawing on SDT, we propose that bullying exposure thwarts employee’s need for relatedness that increase aggressive behavior. Thus, the aim of our study was to test this mediation in a longitudinal design with short time intervals (i.e. monthly). A six-wave online survey design with monthly time lag was employed and data were collected among U.S. employees. The sample consists of 1,595 respondents (55.8% females, n=890, ageM = 36.9, ageSD =10.3). Workplace bullying exposure was assessed with the S-NAQ (Notelaers et al., 2018). Being a perpetrator of bullying was measured by the same nine items of the S-NAQ, however, formulated in an active manner (e.g., Baillien et al., 2011). Finally, frustration of the need for relatedness was assessed with the Psychological Needs Thwarting Scale (Bartholomew et al., 2011). Cross-lagged mediation analysis within a path modeling framework only partially confirmed the proposed model: WB exposure was significantly related to a change in frustration of relatedness. However, frustration of relatedness did (most of the time) not increase WB perpetration, but WB exposure. These longitudinal findings underline the vicious circle nature of WB exposure. [less ▲]

Detailed reference viewed: 91 (0 UL)
Full Text
Peer Reviewed
See detailPrivacy-Preserving Processing of Filtered DNA Reads
Fernandes, Maria UL; Decouchant, Jérémie UL; Volp, Marcus UL et al

Scientific Conference (2019, October 22)

Detailed reference viewed: 84 (14 UL)
See detailRussians in Luxembourg: Russische Immigration nach Luxemburg 1918-1935: Einwanderer aus einem nicht-existierenden Land
Ganschow, Inna UL

Scientific Conference (2019, October 18)

Die Einwanderer_innen aus dem früheren Russischen Reich trugen zur Arbeiterlandschaft im Süden, Norden und Osten Luxemburgs nach dem Ersten Weltkrieg bei. Nimmt man diese „Russen“ genauer unter die Lupe ... [more ▼]

Die Einwanderer_innen aus dem früheren Russischen Reich trugen zur Arbeiterlandschaft im Süden, Norden und Osten Luxemburgs nach dem Ersten Weltkrieg bei. Nimmt man diese „Russen“ genauer unter die Lupe, zeigen sich mindestens drei neue Gruppen, die die bereits vor 1914 bestehende russische Gemeinde vergrößerten. Die ersten sind die ehemaligen Kriegsgefangenen aus den Lagern in Frankreich, Belgien und Deutschland. Ein Teil ist vor Kriegsende als Flüchtlinge im Lande, die anderen kommen nach dem Waffenstillstand im November 1918. Sie wollen nicht zurück nach Russland, wo der Bürgerkriegt tobt. Die zweite Gruppe kommt im Laufe des Bürgerkrieges um 1926-1929 aus Bulgarien und Serbien nach. Es handelt sich um noch zusammenhaltende Weißgardisten, die zu der über die Krim in die Türkei evakuierte Armee von Petr Wrangel gehörten. Schließlich ist die dritte Gruppe der zivilen politischen Flüchtlinge zu erwähnen, die seit den frühen 1920ern meistens über Deutschland nach Luxemburg kamen und öfters Angehörigen der jüdischen Glaubensgemeinschaft waren. Viele von ihnen sind bereits seit den intensivierten Pogromen der ersten russischen Revolution von 1905 in Europa. Die Wanderungsstrukturen dieser verschiedenen und sehr heterogenen Gruppen von „Russen“ stehen im Mittelpunkt des Vortrags. [less ▲]

Detailed reference viewed: 61 (9 UL)
See detailDiscussion of "Do ETFs Increase Liquidity?" by Mehmet Saglam, Tugkan Tuzun and Russ Wermers
Holcblat, Benjamin UL

Scientific Conference (2019, October 18)

Detailed reference viewed: 244 (8 UL)
See detailApproche européenne sur l'entreprise : de la nouveauté ?
Corbisier, Isabelle UL

Scientific Conference (2019, October 17)

Detailed reference viewed: 93 (12 UL)
See detailRegards allemands sur le Luxembourg
Brüll, Christoph UL

Scientific Conference (2019, October 17)

Detailed reference viewed: 67 (1 UL)
Full Text
See detailOral History Choices in the Digital Age: An International Perspective
Lambert, Douglas UL

Scientific Conference (2019, October 17)

Indexing oral histories digitally at the timecode level is a practice increasingly adopted for collections, often with the goal of creating online access to recordings. A particular attraction to using an ... [more ▼]

Indexing oral histories digitally at the timecode level is a practice increasingly adopted for collections, often with the goal of creating online access to recordings. A particular attraction to using an index is that it can be generated in less time than a transcript, especially when both must be done manually. Indexing provides convenient access to original recordings and can be a platform for decision-making about a collection over time, for researchers or collection stewards. In my current work in digital oral history at the University of Luxembourg’s Centre for Contemporary and Digital History (C2DH), indexing is being embraced for these strategic and practical benefits. However, indexing approaches I promoted previously in the US will need to be re-envisioned, retooled, and otherwise adapted for new and different cultural and technological contexts. In Europe, many oral history projects tend to be focused on journalistic-style research, so the goal of recording and indexing is different; curating, archiving, and publishing recordings is not necessarily expected or assumed. In Luxembourg and elsewhere in Europe, there is great interest in applying technology-centered analyses to oral history corpora (e.g., topic modeling, sentiment analysis, corpus linguistics, etc.), work predicated on high-quality transcripts rather than indexing. At the same time, improvements have been made in other technology/transcript-centered methods of analysis, such as keyword extraction, named entity recognition, and automated indexing—all of which could advance and improve oral history indexing and analysis practice. These new approaches will be more viable as speech recognition technology continues to improve, making transcripts easier and cheaper to create. As these factors converge, a new balance between transcription, indexing, and human interpretation will develop that supports both conventional oral history uses as well as secondary collection research activities. [less ▲]

Detailed reference viewed: 41 (1 UL)
See detailMonitoring du système scolaire – Le modèle luxembourgeois (invited talk)
Fischbach, Antoine UL

Scientific Conference (2019, October 17)

Detailed reference viewed: 84 (8 UL)
See detailRegards belges sur le Luxembourg 1919-1921
Brüll, Christoph UL

Scientific Conference (2019, October 17)

Detailed reference viewed: 66 (3 UL)
Full Text
Peer Reviewed
See detailTravail frontalier en Suisse et au Luxembourg : mobilités, profils et défis
Pigeron-Piroth, Isabelle UL; Helfer, Malte UL; Belkacem, Rachid

Scientific Conference (2019, October 15)

La Suisse et le Luxembourg sont particulièrement concernés par le travail frontalier. Ces deux pays accueillent à eux seuls plus d’un demi-million de travailleurs frontaliers et recourent à la main ... [more ▼]

La Suisse et le Luxembourg sont particulièrement concernés par le travail frontalier. Ces deux pays accueillent à eux seuls plus d’un demi-million de travailleurs frontaliers et recourent à la main-d’œuvre frontalière depuis plusieurs décennies. Petits pays dynamiques ayant d’importants besoins de main-d’œuvre, ils se caractérisent par des différentiels liés à la présence de frontières (différentiels de prix immobiliers, de taux de chômage, de salaires, de niveaux d’activité économique … avec les pays voisins). Ces différentiels entretiennent la dynamique du travail frontalier (Belkacem et Pigeron-Piroth, 2016). [less ▲]

Detailed reference viewed: 88 (9 UL)
See detailInside the Trading Zone: Doing Digital Hermeneutics in an Interdisciplinary Setting
van der Heijden, Tim UL; Tatarinov, Juliane UL

Scientific Conference (2019, October 11)

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

Our contribution examines the conference theme of digital hermeneutics from the perspective of the Doctoral Training Unit (DTU) in ‘Digital History and Hermeneutics’, a four-year interdisciplinary research and training program hosted by the Centre for Contemporary and Digital History (C²DH) at the University of Luxembourg. The DTU is designed as an experimental platform for collaboration or ‘trading zone’, in which thirteen doctoral candidates with different disciplinary backgrounds – from history, linguistics and philosophy to computer and information science – study and reflect on the epistemological and methodological implications of the ‘digital turn’ on historical research. This presentation reflects on the project’s first year, in which the doctoral candidates were introduced to various skills and methods in digital humanities, including text mining, digital source criticism, database structures, data visualization, GIS analysis, tool criticism and algorithmic critique; and its second year, when data collections had been created and research tools identified that were going to be applied to it. By doing so, it presents some of the main practical and epistemological opportunities and challenges of “thinkering” with digital tools and technologies in the Digital History Lab of the C2DH, and it reflects scientific dissemination strategies for the group and the individual. The analysis is informed by studies on interdisciplinarity, digital humanities infrastructures and communities of practice. It furthermore draws on a series of semi-structured interviews and self-reflexive training reports, in which the doctoral candidates of the DTU reflect on their experiences in doing digital hermeneutics in an interdisciplinary setting. [less ▲]

Detailed reference viewed: 97 (10 UL)
See detailThe ESP estimator
Holcblat, Benjamin UL; Sowell, Fallaw

Scientific Conference (2019, October 08)

Detailed reference viewed: 72 (11 UL)
Full Text
See detailDemountable Steel Connections
Lam, Dennis; Odenbreit, Christoph UL; Yang, Jie et al

Scientific Conference (2019, October 08)

Detailed reference viewed: 36 (5 UL)
Full Text
Peer Reviewed
See detailA Falta que nos move (Le manque qui nous meut) : création documentaire de Christiane Jatahy
Deregnoncourt, Marine UL

Scientific Conference (2019, October 05)

Pour tenter de contribuer humblement au propos de ce colloque intitulé : « Quand les femmes filment : le documentaire dans la péninsule ibérique et dans le continent latino-américain », nous nous ... [more ▼]

Pour tenter de contribuer humblement au propos de ce colloque intitulé : « Quand les femmes filment : le documentaire dans la péninsule ibérique et dans le continent latino-américain », nous nous proposons d’analyser A Falta que nos move (Le manque qui nous meut) de Christiane Jatahy. Depuis 2002, les créations hybrides de cette auteure, metteure en scène et cinéaste carioca se situent sur une « ligne ténue entre réalité et fiction »1. A Falta que nos move en témoigne. En 2005, A Falta que nos move est tout d’abord une création scénique qui est, durant trois ans, présentée dans de nombreux festivals brésiliens et européens. Ensuite, en 2008, A Falta que nos move devient un long métrage documenté tourné en treize heures au sein duquel l’entre-deux théâtre / cinéma génère une tension radicale entre la réalité et la fiction. Cette expérience filmique se situe à la frontière avec la télé-réalité : cinq amis acteurs trentenaires brésiliens se réunissent la veille de Noël. Chacun a grandi sous la dictature militaire, façonné par les produits culturels américains. Ils attendent un invité et s’adressent continuellement au public. Comment Christiane Jatahy procède-t-elle ? Quelle est sa manière de travailler avec les acteurs pour en arriver à brouiller les rapports entre les personnes physiques et les personnages fictifs ? Comment un vrai parti pris esthétique et dramaturgique apparaît-il ? Comment le cinéma influence-t-il le théâtre et vice versa ? C’est précisément à toutes ces questions que nous entendons répondre. [less ▲]

Detailed reference viewed: 49 (0 UL)
Full Text
Peer Reviewed
See detailWYLD Special Symposium: Technological Innovations in Dementia Diagnosis and Care
Leist, Anja UL

Scientific Conference (2019, October)

Researchers and entrepreneurs present technological innovations in dementia diagnosis and care, particularly through the use of wearables, apps, and novel data analysis techniques. These innovations ... [more ▼]

Researchers and entrepreneurs present technological innovations in dementia diagnosis and care, particularly through the use of wearables, apps, and novel data analysis techniques. These innovations address complex challenges of differential dementia diagnosis and ensuring high-quality and safe home and formal care. [less ▲]

Detailed reference viewed: 116 (6 UL)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 172 (16 UL)
See detailL’UniGR-Center for Border Studies et ses outils d’analyse
Wille, Christian UL; Dethier, Perrine

Scientific Conference (2019, October)

Detailed reference viewed: 79 (1 UL)
Full Text
Peer Reviewed
See detailGender inequalities across the life course: A societal perspective on gender differences in dementia
Leist, Anja UL; Ford, Katherine Joy UL

Scientific Conference (2019, October)

Introduction. Women are at increased risk of developing dementia, which can only partly be explained with differences in longevity, sex biology, or differences in detection/diagnosis. A promising approach ... [more ▼]

Introduction. Women are at increased risk of developing dementia, which can only partly be explained with differences in longevity, sex biology, or differences in detection/diagnosis. A promising approach at the population level is the systematic investigation of life course conditions for men and women across countries and cohorts in order to detect if schooling or work opportunities differ by gender. In the cognitive reserve framework, education and work reflect opportunities for cognitively stimulating activities, which increase cognitive reserve across the life course, and which could delay cognitive decline and the diagnosis of dementia. Method. We develop a framework for systematizing gender inequalities across different life stages and life domains, with a focus on systematic disadvantages for women that could be relevant barriers to cognitive reserve development. For the empirical analysis, we gather individual information and performance on cognitive tests from several harmonized cross-national aging surveys, i.e. the U.S. Health and Retirement Study and sister studies (SHARE, ELSA, SAGE), separated by cohort. Historical figures on gender inequalities for countries and cohorts, and their relevant timings in the life course of the older respondents, e.g. during schooling, were gathered from different sources, and merged with the individual-level data. Results. The new framework leads to testable hypotheses in both the Western and global context regarding life-course socialization and schooling and work opportunities that have been different for men and women. We will present preliminary evidence of how female (dis)advantages on different cognitive tests – memory, executive functioning – are mirroring societal gender inequalities. Discussion. We need to better understand how different life-course opportunities for men and women can create gender differences in dementia at old ages in order to identify individuals at risk today and improve conditions for future generations. [less ▲]

Detailed reference viewed: 139 (5 UL)
Full Text
Peer Reviewed
See detailExploring the value of user-generated app data to design and improve urban running environments
van Renswouw, Loes; Bogers, Sander; Lallemand, Carine UL et al

Scientific Conference (2019, October)

Detailed reference viewed: 34 (1 UL)
See detailDie Maske des Bösen : Lombroso, Fu-Manchu, Mabuse
Kohns, Oliver UL

Scientific Conference (2019, October)

Detailed reference viewed: 76 (0 UL)
Full Text
Peer Reviewed
See detailFlood Detection On Low Cost Orbital Hardware
Mateo-Garcia, Gonzalo; Oprea, Silviu; Smith, Lewis et al

Scientific Conference (2019, October)

Satellite imaging is a critical technology for monitoring and responding to natural disasters such as flooding. Despite the capabilities of modern satellites, there is still much to be desired from the ... [more ▼]

Satellite imaging is a critical technology for monitoring and responding to natural disasters such as flooding. Despite the capabilities of modern satellites, there is still much to be desired from the perspective of first response organisations like UNICEF. Two main challenges are rapid access to data, and the ability to automatically identify flooded regions in images. We describe a prototypical flood segmentation system, identifying cloud, water and land, that could be deployed on a constellation of small satellites, performing processing on board to reduce downlink bandwidth by 2 orders of magnitude. We target PhiSat-1, part of the FSSCAT mission, which is planned to be launched by the European Space Agency (ESA) near the start of 2020 as a proof of concept for this new technology. [less ▲]

Detailed reference viewed: 46 (9 UL)
Full Text
Peer Reviewed
See detailEFFECTS OF MULTIPLE OSCILLATOR PHASE NOISE IN PRECODING PERFORMANCE
Martinez Marrero, Liz UL; Merlano Duncan, Juan Carlos UL; Querol, Jorge UL et al

Scientific Conference (2019, October)

Satellite Precoding is a promising technique to meet the target data rates of the future high throughput satellite systems and the costs per bit as required by 5G applications and networks, but it ... [more ▼]

Satellite Precoding is a promising technique to meet the target data rates of the future high throughput satellite systems and the costs per bit as required by 5G applications and networks, but it requires strict synchronization among the transmitted waveforms, in addition to accurate channel state information. Most of the published work about this topic consider ideal oscillators, but in practice, the output of an oscillator is not a single spectral line at the nominal frequency. This paper proposes a model for the oscillator phase noise and analyzes the resulting received signal to interference plus noise ratio (SNIR) in a satellite communication system using Precoding. Simulations of a communication satellite system with a two-beam transponder and two receivers were performed to compute the effective SNIR. This work uses a simulator which also considers practical impairments such as time misalignment, errors in the channel state information, interference, thermal noise and phase noise masks for satellite oscillators. The Precoding methods used for the analysis are Zero Forcing (ZF) and Minimum Mean Square Error (MMSE). The obtained results prove that there is a degradation in the performance due to the use of independent oscillators but this effect is compensated by the precoding matrix. [less ▲]

Detailed reference viewed: 271 (56 UL)
Full Text
Peer Reviewed
See detailThree models of flexible talent management
Usanova, Ksenia UL; Geraudel, Mickaël UL; D'Armagnac, Sophie et al

Scientific Conference (2019, September 30)

Detailed reference viewed: 123 (16 UL)
Peer Reviewed
See detailHow To Attract And Retain Talents In Not-For-Profit Organizations?
Usanova, Ksenia UL; Telitsina, Aleksandra; Geraudel, Mickaël UL

Scientific Conference (2019, September 30)

Detailed reference viewed: 89 (12 UL)
Peer Reviewed
See detailQualitative interviewing in multilingual research
Kalocsanyiova, Erika UL; Shatnawi, Malika

Scientific Conference (2019, September 27)

A growing body of research in super-diverse societies is conducted, by necessity, in multiple languages. Multilingual research practices can play a fundamental role in empowering participants and ... [more ▼]

A growing body of research in super-diverse societies is conducted, by necessity, in multiple languages. Multilingual research practices can play a fundamental role in empowering participants and privileging their voices, especially in migration-related studies. Yet, questions of cross-language interviewing are for the most part avoided or ignored in mainstream research. This contribution seeks to bring cross-language communication back into the focus of methodological discussions. Our paper builds on multilingual interview material extracted from a two-year linguistic ethnographic research project on forced migrants’ integration trajectories in Luxembourg. It looks at interpreter-mediated research encounters, as well as interviewees’ translation and translanguaging moves. Audio recordings and field notes from collaborative data analysis sessions underpin the data for this contribution. Our examples show that there is merit in fixing our analytical gaze on the minute details of language use across different codes, as these allow for a novel inquiry into specific moments of meaning making, role performances and rapport-building in qualitative interviewing. [less ▲]

Detailed reference viewed: 103 (4 UL)
See detailThe Discovery of Ghijsbrecht Donckere’s Perpetuum Mobile: Visual Proof of the First Barometer?
Koeleman, Floor UL

Scientific Conference (2019, September 27)

Ghijsbrecht Donckere is sometimes associated with the invention of the barometer, based on two textual sources from about 1620. No visual record was known of Donckere’s instrument, which was referred to ... [more ▼]

Ghijsbrecht Donckere is sometimes associated with the invention of the barometer, based on two textual sources from about 1620. No visual record was known of Donckere’s instrument, which was referred to as a perpetuum mobile, until now. The rediscovery of a third source, and more importantly, the identification of his device on a contemporary painting, calls for a reassessment. The surroundings of the perpetual motion machine as represented in paint place this instrument at the intersection of natural philosophy and mechanical engineering. Donckere’s invention appears to be loosely based on Cornelis Drebbel’s perpetuum mobile (ca. 1607), and was commissioned by a courtly couple that was already partially informed about the hidden cause of motion of this machine. Nevertheless, the symbolic meaning of the object, rather than an understanding of its actual workings, is put on display. Donckere’s instrument is thus inextricably linked to one of the Aristotelian senses, and to concepts of astronomy and harmony, such as the primum mobile and musica universalis. Even though the textual evidence suggests that the device was at some point used to predict the weather, a reinterpretation particularly emphasizes the rhetoric of the time. The sources do not indicate that the effect of atmospheric pressure was already known. Taking these observations into account, the label of barometer does not seem applicable to Donckere’s perpetuum mobile. The newly revealed visual proof portrays the instrument instead as a collector’s item to be interpreted intellectually by an elite clientele in the early seventeenth century. [less ▲]

Detailed reference viewed: 135 (11 UL)
Full Text
Peer Reviewed
See detailReal-time Radio Frequency Interference Detection and Mitigation with the Front-End GNSS Interference eXcisor (FENIX)
Querol Borras, Jorge UL; Perez, Adrian; Munoz-Martin, Joan Francesc et al

Scientific Conference (2019, September 26)

The number of applications based on Global Navigation Satellite Systems (GNSS) has been increasing in the last years. With its proliferation, Radio-Frequency Interference (RFI) has become one of the most ... [more ▼]

The number of applications based on Global Navigation Satellite Systems (GNSS) has been increasing in the last years. With its proliferation, Radio-Frequency Interference (RFI) has become one of the most concerning topics on GNSS-based devices for navigation, positioning and timing, but also for Earth Observation purposes such as GNSS-Reflectometry (GNSS-R) and GNSS-Radio Occultations (GNSS-RO) due to the corruption of the received signal and the corresponding geophysical measurements. The Front-End GNSS Interference eXcisor (FENIX) mitigates the problem of RFI by providing a plug-and-play solution which, placed between the antenna and the receiver, excises virtually any kind of interference signal, as its mitigation algorithm is agnostic on the particular type of RFI. The new version of FENIX is also capable of operating with large signal bandwidths ($\sim$50 MHz) and dual-band applications (e.g. L1 + L2 or L1/E1 + L5/E5). This paper shows the performance of the system for commercial GNSS receivers and GNSS-R applications. The use of FENIX in Microwave Radiometers is also possible, but it is out of the scope of this paper. [less ▲]

Detailed reference viewed: 99 (6 UL)
Full Text
Peer Reviewed
See detailTHE MARKET SKEWNESS-RETURN RELATIONSHIP, Plenary Talk
Lehnert, Thorsten UL

Scientific Conference (2019, September 25)

Detailed reference viewed: 44 (4 UL)
See detail‘Bis zum Anthropozän und noch viel weiter’: Space Mining in Luxemburger Hörspielen
Thiltges, Sébastian UL

Scientific Conference (2019, September 25)

Detailed reference viewed: 26 (1 UL)
Full Text
Peer Reviewed
See detailEarly-stage topological and technological choices for TSN-based communication architectures
Navet, Nicolas UL; Villanueva, Josetxo; Migge, Jörn

Scientific Conference (2019, September 24)

A main issue in the design of automotive communication architectures is that the most important design choices pertaining to the topology of the networks and the technologies to use (protocols, data rate ... [more ▼]

A main issue in the design of automotive communication architectures is that the most important design choices pertaining to the topology of the networks and the technologies to use (protocols, data rate, hardware) have to be made at a time when the communication requirements are not entirely known. Indeed, many functions only becomes available along the development cycle, and vehicle platforms have to support incremental evolutions of the embedded system that may not be fully foreseeable at the time design choices are made. The problem is becoming even more difficult and crucial with the introduction of dynamically evolving communication requirements requiring network re-configuration at run-time. We present how the use of synthetic data, that is data generated programmatically based on past vehicle projects and what can be foreseen for the current project, enables the designers to make such early stage choices based on quantified metrics. The proposals are applied to Groupe Renault's FACE service-oriented E/E architecture with the use of a software-implemented function we called “Topology Stress Test”. [less ▲]

Detailed reference viewed: 148 (9 UL)
See detailMoney Laundering and Cryptocurrencies
Allegrezza, Silvia UL

Scientific Conference (2019, September 24)

Detailed reference viewed: 257 (5 UL)
Full Text
Peer Reviewed
See detailProceedings of the Deduktionstreffen 2019
Schon, Claudia; Steen, Alexander UL

Scientific Conference (2019, September 23)

The annual meeting Deduktionstreffen is the prime activity of the Special Interest Group on Deduction Systems (FG DedSys) of the AI Section of the German Society for Informatics (GI-FBKI). It is a meeting ... [more ▼]

The annual meeting Deduktionstreffen is the prime activity of the Special Interest Group on Deduction Systems (FG DedSys) of the AI Section of the German Society for Informatics (GI-FBKI). It is a meeting with a familiar, friendly atmosphere, where everyone interested in deduction can report on their work in an informal setting. [less ▲]

Detailed reference viewed: 63 (3 UL)
See detailWann kam die Grenze auf die Karte? Zur Konstruktion von Herrschaftsgebieten zwischen Reich und Frankreich in der Frühen Neuzeit
Uhrmacher, Martin UL

Scientific Conference (2019, September 19)

Feste politische Grenzen, wie man sie heute kennt, die ein Staatsgebiet nach innen wie nach außen umfassend begrenzen, sind im Raum zwischen Maas und Rhein ein Produkt des späten 18. Jahrhunderts. Für ... [more ▼]

Feste politische Grenzen, wie man sie heute kennt, die ein Staatsgebiet nach innen wie nach außen umfassend begrenzen, sind im Raum zwischen Maas und Rhein ein Produkt des späten 18. Jahrhunderts. Für diese Region wird nach dem Ursprung dieser festen Grenzlinien gesucht, die heute ein selbstverständlicher Bestandteil von Karten sind. Seit dem späten 16. Jahrhundert wurden im Westen des Heiligen Römischen Reiches erstmals historische Karten publiziert und im Druck verbreitet, die unser Bild der territorialen Landschaft bis heute prägen. Ab wann aber werden solche Grenzlinien zur Darstellung territorial-räumlicher Verhältnisse verwendet? Und welche Rolle kommt ihnen bei der Konstruktion von Herrschaft im Raum zu? Diesen Fragen widmet sich der Beitrag für die Region zwischen Maas und Rhein. Sie liegt an der Schnittstelle von Germania und Romania und ist durch Einflüsse beiderseits der Sprachgrenze geprägt. [less ▲]

Detailed reference viewed: 142 (6 UL)
Peer Reviewed
See detail(Im)mobilizing languages
Kalocsanyiova, Erika UL

Scientific Conference (2019, September 19)

This presentation is concerned with the impact of multilingualism on forced migrants’ trajectories. It reports the findings of a two-year qualitative research project, which used ethnographic research ... [more ▼]

This presentation is concerned with the impact of multilingualism on forced migrants’ trajectories. It reports the findings of a two-year qualitative research project, which used ethnographic research methods, including narrative and go-along interviews, classroom and participant observations and linguistic analysis of interactional data. The project set out to investigate how forced migrants reflect, position, and affirm themselves – through languages – in multilingual societies. Our contribution aligns itself with the body of research that challenges hegemonic monolingual and monocultural practices (Grzymala-Kazlowska/Phillimore 2018, Van Avermaet 2009). Other major influences were Juffermans and Tavares’s (2017) research on south-north trajectories and linguistic repertoires, Stevenson’s (2014, 2017) work on language (hi)stories and Busch’s (2017) biographical explorations of Spracherleben. In this talk, the focus will be on the experiences of three men from Syria and Iraq who have obtained humanitarian protection in Luxembourg, but aspire to fulfil their integration aspirations across multiple locations and countries. A careful analysis of divergent trajectories sheds light on how experiences of linguistic inequality and/or success are imprinted on forced migrants’ repertoires and shape their understanding of (successful) integration. [less ▲]

Detailed reference viewed: 65 (2 UL)
See detailSize-dependent spatial magnetization profile of Manganese-Zinc ferrite nanoparticles
Bersweiler, Mathias UL

Scientific Conference (2019, September 18)

Detailed reference viewed: 65 (4 UL)
Full Text
Peer Reviewed
See detailFördern reflexionsbasierter Schulpraktika, die Professionalisierung von Studierenden für den Umgang mit Heterogenität
Weber, Jean-Marie UL; Rauh, Bernhard; Datler, Margit

Scientific Conference (2019, September 18)

Detailed reference viewed: 39 (0 UL)
Peer Reviewed
See detailMale vs female gamers: Testing the stereotype threat effect in video gaming
Holl, Elisabeth UL; Wagener, Gary Lee; Melzer, André UL

Scientific Conference (2019, September 17)

Stereotype threat (ST), defined as the risk of confirming a negative stereotype about one’s own group, has been demonstrated in various social contexts. Regarding video games, for example, informing ... [more ▼]

Stereotype threat (ST), defined as the risk of confirming a negative stereotype about one’s own group, has been demonstrated in various social contexts. Regarding video games, for example, informing female participants that men would outperform women in gaming leads to gender differences in performance. To date, however, these studies have not looked into the mechanisms of this ST effect in gaming. In two lab studies (N=186), some participants were confronted with ST-related information before playing a video game. In Study 1, half of the participants read a bogus article confirming the “standard” gender stereotype (“men outperform women”). In Study 2, a reverse stereotype was presented to half of the participants (“women have outpaced men in some game genres”). In contrast to hypotheses, both studies failed to show the expected significant interaction effect of gender and ST condition on performance, although female participants confronted with the “standard” gender stereotype reported greater frustration in Study 1, for example. In sum, results indicate a complex relationship between gender, social identity, experience with the game genre, and behavior. Identifying oneself as a gamer and being experienced in a particular game genre were found to be better performance predictors than reading stereotype threatening information. [less ▲]

Detailed reference viewed: 197 (4 UL)
See detailLe blanchiment: évolution du cadre européen et nouvelles formes numériques
Allegrezza, Silvia UL

Scientific Conference (2019, September 17)

Detailed reference viewed: 113 (3 UL)
See detailThe real problem with Rawlsian reasonableness
Burks, Deven UL

Scientific Conference (2019, September 17)

In The Law of Peoples, Rawls states that, if “political liberalism offers no way of proving that this specification [of reasonableness] is itself reasonable”, this is no great loss, for “it is simply ... [more ▼]

In The Law of Peoples, Rawls states that, if “political liberalism offers no way of proving that this specification [of reasonableness] is itself reasonable”, this is no great loss, for “it is simply politically reasonable to offer fair terms of cooperation to other free and equal citizens, and it is simply politically unreasonable to refuse to do so” (Rawls 1999: 87-8). While Rawls is undoubtedly right that public reason liberalism analytically requires some standard of reasonableness, it is less obvious this standard must take Rawls’s preferred form. Yet criticisms of Rawlsian “reasonableness” as “loaded” (Stout 2004: 184), “chimerical” (Young 2005: 308) or “entirely circular” (Mulhall and Swift 2003: 483) often equivocate on the meaning of reasonableness and so fall afoul of the “equivocation defense” (Freeman 2004: 2063-5). In this paper, I improve on those earlier criticisms by means of a narrow, immanent criticism whereon the two basic aspects of reasonableness – (A1) proposing and abiding by fair terms of cooperation and (A2) recognizing the “burdens of judgment” (Rawls 1996: 54-8) – may plausibly conflict: in some instances, accepting (A2) may give persons reason to disagree over the need to accept (A1). To show this, I first restate two aspects of reasonableness as a biconditional: a person is reasonable iff (A1) and (A2) obtain. I then examine whether Rawls’s burdens give reason to doubt the requirement in (A1). Insofar as the third, fourth and fifth burdens give reason to doubt just this requirement, I conclude that Rawlsian reasonableness should be reformulated. This reformulation preserves what Rawls gets right about reasonableness – namely, the burdens – but replaces the old standard with “reasonableness pluralism”, from which it follows that public reason cannot represent all the necessary conditions of political justification under circumstances of reasonable pluralism. [less ▲]

Detailed reference viewed: 96 (1 UL)
Peer Reviewed
See detailA Formal Framework for Structured N-Back Stimuli Sequences
Ansarinia, Morteza UL; Mussack, Dominic UL; Schrater, Paul et al

Scientific Conference (2019, September 15)

Detailed reference viewed: 25 (0 UL)
See detailSocial stratification in higher education trajectories: A sequence-analytical approach
Haas, Christina UL

Scientific Conference (2019, September 13)

Detailed reference viewed: 95 (2 UL)
Full Text
Peer Reviewed
See detailDifferences in physical activity among children with physically active and inactive parents
Eckelt, Melanie UL; Hutmacher, Djenna UL; Steffgen, Georges UL et al

Scientific Conference (2019, September 13)

Objectives: Parental physical activity is considered as positively related to children´s physical activity (PA; Sallis, Prochaska & Taylor, 2000). Since parents serve as role models, have the potential to ... [more ▼]

Objectives: Parental physical activity is considered as positively related to children´s physical activity (PA; Sallis, Prochaska & Taylor, 2000). Since parents serve as role models, have the potential to influence the health-related behavior and, for instance, to alter a mainly sedentary lifestyle of their children (Beets, Cardinal & Alderman, 2010), the impact of parental PA has become a key issue in research. Many studies report associations between parental PA and the PA behavior of their children, e.g., the direct involvement of the parents in activities with their children is related to increased levels of their PA (Adkins, Sherwood, Story, & Davis, 2004; Beets, Vogel, Chapman, Pitetti, & Cardinal, 2007). However, the mechanisms of parental influence are still poorly understood and besides recent studies are based on self-reported data. Therefore, this study aims to examine if parental PA is related to the subjectively and objectively measured PA of their children. Methods: 237 Luxembourgish children and adolescents (134 girls and 103 boys) aged from 10-18 years participated in the study. Via a digital questionnaire, the children indicated if their mother and father are physically active on a regular basis and if they are active together with their parents. Furthermore, the children and adolescents indicated if they are active at least 60 minutes/ day and if they own a membership in a sports club (MoMo physical activity questionnaire). Additionally, children’s PA behavior was objectively assessed by wearing an accelerometer (ActiGraph GT3X-BT) for a period of seven consecutive days. Activity was categorized as sedentary, light physical activity or moderate to vigorous physical activity (MVPA) using age-specific thresholds. Results: A multivariate ANOVA revealed significant differences in self-reported physical activity if the mother was physically active (F (2, 166) = 5.4, p < .01). Thus, children reported subjectively higher daily activity duration (p < .05) and more activities in a regular week (p < .01). There was no impact on self-reported PA if the father was active or the children were active with their parents together. Regarding the objective data, there were no significant differences between children with active parents and children with inactive parents. If the parents were active with their children together there were significant differences (F (3, 229) = 3.2, p < .05), thus MVPA per day was higher (p < .05) and the sedentary time was lower (p < .01). Neither subjective nor objective data revealed gender-specific differences. Discussion: In contrast to other studies, only the mother seems to have an influence on the subjective PA behavior of the children. The fact, that parents being active or in a sports club does not appear to enhance the PA of the children objectively. However, the objective PA is merely affected by being active together. According to this finding, joint activities of parents and children seem to be necessary to promote children’s PA effectively. It is important to note that in our study the parental PA was rated by the children. In future studies, parents should be included via self-report questionnaires and/or accelerometer. [less ▲]

Detailed reference viewed: 129 (8 UL)
Full Text
See detailBringing Digital Oral History to Luxembourg
Lambert, Douglas UL

Scientific Conference (2019, September 13)

Oral history is a field with a growing digital component and, as with other DH fields, computer-based techniques and systems have revolutionized the way we process and present content. One particular set ... [more ▼]

Oral history is a field with a growing digital component and, as with other DH fields, computer-based techniques and systems have revolutionized the way we process and present content. One particular set of activities, which I refer to as Oral History Digital Indexing (OHDI), has been important in shaping new processes and methods for organization, analysis, and curation of digital oral history. I have been directly involved with this work in the United States and am currently working in Luxembourg to explore what aspects of OHDI will be appropriate in Europe. In this presentation I will introduce the organizations, projects, and tools that have helped shape OHDI. Among these projects/products is the Oral History Metadata Synchronizer, or OHMS, which has two important modes of digital indexing for oral histories. One is a transcript synchronization tool and the second an indexing tool, both of which help create multimedia webpages that connect interviews in an audio/video media player with text representations of the content. OHMS and other tools will be highlighted briefly, while emphasizing that no two systems have exactly the same features. One unifying principle behind OHDI tools is that indexing processes, i.e., creating shorter, summarizing text tied to time points in the a/v media, can and should take priority over word-for-word transcription. The indexing concept leads to multiple options for processing, analyzing, and presenting an oral history and OHDI also provides a framework for operating under the inevitable reality that not all digital processing options are feasible to pursue. [less ▲]

Detailed reference viewed: 41 (3 UL)
Peer Reviewed
See detailDigital History as Trading Zone? Reflections from a Doctoral Training Unit
van der Heijden, Tim UL

Scientific Conference (2019, September 12)

This paper addresses the question how Digital History “trading zones” are being constituted in practice and how they are situated in physical working environments. The analysis is based on a case study of ... [more ▼]

This paper addresses the question how Digital History “trading zones” are being constituted in practice and how they are situated in physical working environments. The analysis is based on a case study of the Doctoral Training Unit (DTU) “Digital History and Hermeneutics”, an interdisciplinary research and training programme that was established at the Luxembourg Centre for Contemporary and Digital History (C²DH) of the University of Luxembourg. The DTU is designed as an interdisciplinary “trading zone”, in which thirteen doctoral candidates with different disciplinary backgrounds – from history, linguistics and philosophy to computer and information science – reflect on the epistemological and methodological challenges of doing digital history and humanities research (Fickers 2015, 2012). The paper reflects on the project’s first year, in which the doctoral researchers were introduced to various skills and methods in digital humanities as part of the so-called “DH incubation phase”. This phase included trainings in text mining, digital source criticism, database structures, data visualization, GIS analysis, tool criticism and algorithmic critique. The paper presents some of the main practical and epistemological opportunities and challenges of “thinkering”: the playful experimentation with digital tools and technologies for doing historical research. It furthermore reflects on the practical and institutional challenges of constituting an interdisciplinary trading zone, like the DTU. As such, it addresses a number of critical questions: How to build bridges between different knowledge domains in a specific research environment? How to stimulate interdisciplinary collaboration and to get scholars out of their disciplinary or methodological comfort zones? What is at stake in such interdisciplinary trading zones? Who are the traders – and what is being traded? The analysis is informed by studies on interdisciplinarity (Klein 2015, Deegan and McCarty 2012, Stehr and Weingart 2000), trading zones (Collins et al. 2007, Galison 1996, Kemman 2019) and communities of practice (Wenger 1998). Empirically, it draws on a series of semi-structured interviews and thirty-nine self-reflexive training reports, in which the doctoral researchers of the DTU discuss their experiences of doing digital history and hermeneutics in an interdisciplinary setting. Finally, the paper evaluates the suitability of the trading zone concept as analytical framework for studying interdisciplinary collaborations in Digital History as a field. [less ▲]

Detailed reference viewed: 86 (2 UL)
Peer Reviewed
See detailIncome Inequality and the Strength of the Origins-Health Gradient in 20 European Countries
Chauvel, Louis UL; Bar-Haim, Eyal UL; Leist, Anja UL

Scientific Conference (2019, September 12)

Health is determined by socio-economic position not only of the individual, but also by that of their parents. The intergenerational transmission of health via parental socioeconomic status is suggested ... [more ▼]

Health is determined by socio-economic position not only of the individual, but also by that of their parents. The intergenerational transmission of health via parental socioeconomic status is suggested to vary according to contextual factors such as income inequality. Earlier studies with a comparative perspective had a limited number of countries available. This study uses 20 countries at up to five waves from the European Social Survey (2008-2016) and SWIID in order to examine the extent to which income inequality is related to the origins-health gradient. The higher the income inequality of a given country and year, the stronger the origins-health gradient. Contrary to earlier findings, this association can be fully explained by intergenerational transmission of status, i.e. education. Implications of this finding are that health is largely determined by educational attainment and associated health behaviors, giving societal context a less prominent role than earlier studies suggested. [less ▲]

Detailed reference viewed: 144 (15 UL)
Peer Reviewed
See detailAdaptive equation-free multiscale modeling of metallic lattices with geometrical nonlinearity and variability
Chen, Li UL; Berke, Peter; Beex, Lars UL et al

Scientific Conference (2019, September 12)

An equation-free concurrent multiscale framework is proposed to model 3D metallic lattice structures. The proposed equation-free multiscale method (EFMM) is effectively a generalization of the ... [more ▼]

An equation-free concurrent multiscale framework is proposed to model 3D metallic lattice structures. The proposed equation-free multiscale method (EFMM) is effectively a generalization of the quasicontinuum method [2] and relies on the use of fully-resolved domains (FRD) in which all details of the lattice micro-structure are captured, and of coarse-grained domains (CGD) in which a model reduction is performed by interpolation and summation steps. The particularity of the lattice geometrical description is that cross section variations along the lattice struts (caused by the manufacturing process) are explicitly represented by their discretization in several beam finite elements, both in the FRDs and CGDs. The interpolation step of the EFMM refers to a kinematic approximation of the lattice deformation within CGDs based on the displacement of a reduced number of material points. One of the originalities of this work is the consideration of a separate interpolation of each type of kinematic variables within the CGDs, as a function of the connectivity of the lattice beam nodes (i.e. taking the location of different cross sections into account) and their kinematical pattern. This, together with accounting for geometric nonlinearity, by the development and implementation of a 3D co-rotational beam finite element [1], are innovative contributions. Choosing the appropriate sizes of the FRDs and the CGDs for a lattice to be simulated is a trade-off because larger FRDs prevail the accuracy but compromise the efficiency while larger CGDs do the opposite. Since the required sizes of the FRDs and CGDs are generally not known a priori for specific applications, an adaptive coarse-graining strategy is developed. To be specific, the whole lattice is initially considered as a CGD. Two kinds of error indicator are proposed (e.g. the Zienkiewicz-Zhu error indicator [4, 3] and the error indicator based on the discrepancy of strain energy). The error indicator guides on: 1) introducing more material points and rearranging the interpolation for the CGDs; 2) changing the localization-prone parts of the lattice into FRDs. The adaptive EFMM is applied to metallic BCC lattices with various sizes and loading conditions. By comparing to the results of those of the direct numerical simulation (DNS), it is shown that geometrical non-linearities can be captured at a fraction of the DNS cost. [less ▲]

Detailed reference viewed: 47 (2 UL)