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

Scientific Conference (in press)

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See detailA Novel Heap-based Pilot Assignment for Full Duplex Cell-Free Massive MIMO with Zero-Forcing
Nguyen, Van Hieu; Nguyen, van Dinh UL; Dobre, Octavia A. et al

Scientific Conference (in press)

This paper investigates the combined benefits of full-duplex (FD) and cell-free massive multiple-input multipleoutput (CF-mMIMO), where a large number of distributed access points (APs) having FD ... [more ▼]

This paper investigates the combined benefits of full-duplex (FD) and cell-free massive multiple-input multipleoutput (CF-mMIMO), where a large number of distributed access points (APs) having FD capability simultaneously serve numerous uplink and downlink user equipments (UEs) on the same time-frequency resources. To enable the incorporation of FD technology in CF-mMIMO systems, we propose a novel heapbased pilot assignment algorithm, which not only can mitigate the effects of pilot contamination but also reduce the involved computational complexity. Then, we formulate a robust design problem for spectral efficiency (SE) maximization in which the power control and AP-UE association are jointly optimized, resulting in a difficult mixed-integer nonconvex programming. To solve this problem, we derive a more tractable problem before developing a very simple iterative algorithm based on inner approximation method with polynomial computational complexity. Numerical results show that our proposed methods with realistic parameters significantly outperform the existing approaches in terms of the quality of channel estimate and SE. [less ▲]

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See detailPractical aspects of the Bank-Weiser estimator implementation and Biomechanics applications.
Bulle, Raphaël UL; Bordas, Stéphane UL; Chouly, Franz et al

Scientific Conference (2020, July)

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See detailSystematic derivation of Generalized Langevin Equations for coarse-graining and bridge-scaling procedures
Meyer, Hugues UL

Scientific Conference (2020, July)

In many branches of physics, one must often deal with processes involving a huge number of degrees of freedom. Instead of describing the dynamics of each individual of them, one rather wants to ... [more ▼]

In many branches of physics, one must often deal with processes involving a huge number of degrees of freedom. Instead of describing the dynamics of each individual of them, one rather wants to characterize the process of interest via a small set of observ- ables that capture its main features of the process. Even if the microscopic dynamics can be resolved using Newton’s equations of motion, it quickly becomes a computation- ally very expensive calculation to make. It is however much more convenient to come up with a self-consistent equation of motion for the ’global’ observable of interest itself in order to reduce the complexity of the problem. The development of the Mori-Zwanzig formalism in the 1960’s allowed to systematically derive such equations for arbitrary observables in stationary processes. This framework, derived from first principles by means of projection operator techniques, proves the structure of what is now known as the Generalized Langevin Equation, i.e. a stochastic equation of motion which a priori exhibits memory effects in the form on non-localities in time. We propose to extend the formalism and its corollaries to a broad class of out-of- equilibrium processes. We show that the structure of the Generalized Langevin Equa- tion is overall robust but must be adapted to account for the non-stationary dynamics [1,2]. The function that controls memory effects the stochastic term are related through a relation that can be associated to fluctuation-dissipation theorems. This formalism is very convenient to study two-time auto-correlation functions for which we can write a self-consistent differential equation as well. We finally show a new method to evaluate the memory function from numerical or experimental data [3]. [less ▲]

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See detailA short Survey on the Cyber Security in Control Systems
Bezzaoucha, Souad UL; Voos, Holger UL

Scientific Conference (2020, July)

In the present survey paper, we give a short, yet exhaustive state-of-the-art about the cyber-security applied to control systems, especially the event-based strategy. Indeed, in the past few years, due ... [more ▼]

In the present survey paper, we give a short, yet exhaustive state-of-the-art about the cyber-security applied to control systems, especially the event-based strategy. Indeed, in the past few years, due to a highest degree of connectivity in modern systems, new related control-specific cyber-physical systems security challengesarise and novel approaches integrating the cyber aspect are developed.Our goal in this paper is then to provide an overview of attack-modeling and security analysis approaches in recent works thatexplore networked control systems subject to cyber-attacks attacks. To this end, we look at the control, estimation, and modeling problems. [less ▲]

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See detailDATA DRIVEN SURGICAL SIMULATIONS
Deshpande, Saurabh UL; Bordas, Stéphane UL; Beex, Lars UL et al

Scientific Conference (2020, July)

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See detailInverse simulation for retrieving the undeformed position for hyperelastic materials : application to breast simulations
Mazier, Arnaud UL; Bilger, Alexandre; Forte, Antonio et al

Scientific Conference (2020, July)

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See detailSuccessive Convex Approximation for Transmit Power Minimization in SWIPT-Multicast Systems
Gautam, Sumit UL; Lagunas, Eva UL; Kisseleff, Steven UL et al

Scientific Conference (2020, June)

We propose a novel technique for total transmit power minimization and optimal precoder design in wireless multi-group (MG) multicasting (MC) systems. The considered framework consists of three different ... [more ▼]

We propose a novel technique for total transmit power minimization and optimal precoder design in wireless multi-group (MG) multicasting (MC) systems. The considered framework consists of three different systems capable of handling heterogeneous user types viz., information decoding (ID) specific users with conventional receiver architectures, energy harvesting (EH) only users with non-linear EH module, and users with joint ID and EH capabilities having separate units for the two operations, respectively. Each user is categorized under unique group(s), which can be of MC type specifically meant for ID users, and/or an energy group consisting of EH explicit users. The joint ID and EH users are a part of the (last) EH group as well as any one of the MC groups distinctly. In this regard, we formulate an optimization problem to minimize the total transmit power with optimal precoder designs for the three aforementioned scenarios, under constraints on minimum signal-to-interference-plus-noise ratio and harvested energy by the users with respective demands. The problem may be adapted to the well-known semi-definite program, which can be typically solved via relaxation of rank-1 constraint. However, the relaxation of this constraint may in some cases lead to performance degradation, which increases with the rank of the solution obtained from the relaxed problem. Hence, we develop a novel technique motivated by the feasible-point pursuit and successive convex approximation method in order to address the rank-related issue. The benefits of the proposed method are illustrated under various operating conditions and parameter values, with comparison between the three above-mentioned scenarios. [less ▲]

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See detailConstcamer Paintings as Epistemic Images: Early Modern Theaters of Wisdom
Koeleman, Floor UL

Scientific Conference (2020, April)

This paper argues, against existing literature, that 17th-cent. constcamer paintings were objects to think with, functioning as the two-dimensional space of artificial memory. In turn, these artworks ... [more ▼]

This paper argues, against existing literature, that 17th-cent. constcamer paintings were objects to think with, functioning as the two-dimensional space of artificial memory. In turn, these artworks complicate conventional definitions of epistemic images more broadly. I focus on an analysis of constcamer paintings accounting for the reception of the ancients and the mnemonic and propaedeutic role of images, entailing concepts such as wonder or thauma (from Greek θεάομαι), the drive to gather knowledge, memory as the locus of this ‘collection’, and recollecting as the intellectual process of interaction with memorized knowledge. The term inventor, referring to the creator of a given collection, is derived from the rhetorical technique for the retrieval of information. The theatre or ‘place for viewing’ provided the physical context for the collected wisdom. Inventors of constcamer paintings – often artists themselves – vitally participated in knowledge formation contributing to contemporary intellectual debates. [less ▲]

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See detailNew opportunities by laser joining of dissimilar materials
Plapper, Peter UL

Scientific Conference (2020, February 13)

The presentation gives an overview about research projects at UL related to laser welding of dissimilar materials. Literature reference at the end enables the reader to dig deeper in case some specific ... [more ▼]

The presentation gives an overview about research projects at UL related to laser welding of dissimilar materials. Literature reference at the end enables the reader to dig deeper in case some specific projects are of interest. [less ▲]

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See detailVon Imaginationen himmlischer Erlösung bis zum Pogrom – Der Umgang mit Leprakranken im historischen Überblick.
Uhrmacher, Martin UL

Scientific Conference (2020, February 13)

Die Geschichte der Lepra ist geprägt von Elend, Siechtum und Ausgrenzung bis hin zum Pogrom, aber andererseits auch von religiöser Überhöhung, Privilegierung und beispielhafter Fürsorge. Diese Ambivalenz ... [more ▼]

Die Geschichte der Lepra ist geprägt von Elend, Siechtum und Ausgrenzung bis hin zum Pogrom, aber andererseits auch von religiöser Überhöhung, Privilegierung und beispielhafter Fürsorge. Diese Ambivalenz ist sehr typisch für den Umgang mit Leprakranken, auch Leprose genannt, im Mittelalter und in der frühen Neuzeit. Und sie spiegelt sich auch in Vorurteilen wider, mit denen die an Lepra Erkrankten konfrontiert waren. Das Spektrum reicht hier von Imaginationen himmlischer Erlösung bis hin zur Unterstellung von Sünden und Verbrechen. Der Vortrag beschreibt zunächst Ursprünge und Ausprägungen von Vorurteilen gegenüber Leprakranken beschreiben. Kann man überhaupt von „den Leprosen“ sprechen, die stets als typische Randgruppe der mittelalterlichen Gesellschaft bezeichnet werden? Oder führten Vorurteile in unterschiedlichen zeitlichen und sozialen Kontexten womöglich zur Bildung verschiedener Gruppen? Hierzu werden im zweiten Teil ausgewählte Quellenbeispiele in den Blick genommen. Sie zeigen auf, welche konkreten Auswirkungen bestehende Vorurteile in der Praxis auf die Lebenswelt von Leprakranken hatten. Und sie ermöglichen, der Wandlung von Vorurteilsstrukturen in der long durée nachzugehen. [less ▲]

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See detailLe relations belgo-luxembourgeoises: une mise en perspective historique
Brüll, Christoph UL

Scientific Conference (2020, February 05)

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See detailN point Virasoro algebras considered as Krichever - Novikov type algebras
Schlichenmaier, Martin UL

Scientific Conference (2020, February 04)

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See detailOpening the black box of the social learning process: The case of community of practices
Boughattas, Yosra; Geraudel, Mickaël UL; Claeye, Frederic

Scientific Conference (2020, February 04)

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See detailLocal Organiser, European Shadow Financial Regulatory Committee Meeting
Wolff, Christian UL

Scientific Conference (2020, February)

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See detailThe Loneliness of the Vilain : Shakespeare and Schiller
Kohns, Oliver UL

Scientific Conference (2020, February)

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See detailWhen a Master Dies: Speculation and Asset Float”
Penasse, Julien UL; Renneboog,, Luc; Scheinkman, José A.

Scientific Conference (2020, January 30)

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See detailLa pluralité des marchés du travail au Luxembourg
Pigeron-Piroth, Isabelle UL

Scientific Conference (2020, January 28)

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See detailWhy is the Market Skewness-Return Relationship Negative?
Lehnert, Thorsten UL

Scientific Conference (2020, January 23)

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we ... [more ▼]

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we consider the usual interpretation of e.g. option-implied skewness as an indicator of jump risk or downside risk. One possible explanation for this inconsistency is that there are factors affecting option-implied market skewness other than jump risk in the stock market. In this paper, I find that price pressure associated with “crowded trades” of mutual funds is an important endogenous factor. Given that retail investors are prone to herding, the directional trading of mutual funds is correlated, and their collective actions can generate short-term price pressure on aggregate stock prices. Short sellers systematically exploit these patterns not only in the equity lending market, but also in the options market. In line with this economic channel, I find that firstly, the significant negative relationship between market skewness and returns becomes insignificant, once I control for price pressure. Secondly, the negative relationship is only present for the “bad” downside component of risk-neutral skewness, associated with out-of-the-money put options. For the “good” upside component of risk-neutral skewness, associated with out-of-the-money call options, the relationship is always positive. Thirdly, price pressure affects the skewness-return relationship, which can be clearly distinguished from the impact of flows on the volatility-return relationship in terms of the leverage effect. [less ▲]

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See detail„Entweder man kann’s oder man lässt es bleiben.“ Kritische Gedanken zur Ausbildung von Blasmusikdirigenten
Sagrillo, Damien UL

Scientific Conference (2020, January 17)

Diesen Karl Böhm in den Mund gelegten Satz passt zu seinem Naturell. Sein Sarkasmus und Zynismus waren bekannt. Karl Böhm hat nie ein Dirigierstudium absolviert. Dennoch gehörte er zu den Großen seines ... [more ▼]

Diesen Karl Böhm in den Mund gelegten Satz passt zu seinem Naturell. Sein Sarkasmus und Zynismus waren bekannt. Karl Böhm hat nie ein Dirigierstudium absolviert. Dennoch gehörte er zu den Großen seines Fachs. In der Fachzeitschrift „das Orchester“ ist im Zusammenhang mit dem berufsausbildenden Angebot für Blasorchesterdirigenten folgendes zu lesen: „Marschmusik oder leichtere Muse haben keinen Platz im Curriculum, die Konzentration liegt auf der Literatur für Sinfonisches Blasorchester“ Diese Aussage gehört kritisch hinterfragt. In meinem Vortrag steht infolgedessen zweierlei im Vordergrund. Zum einen: Was ist ein sinfonisches Blasorchester bzw. eine Bläserphilharmonie – wo kommen die Begriffe her, worauf zielen sie ab? Zum anderen: Marchmusik und sog. „leichte Muse“ gehören zum Wesen lokaler Musikvereine. Wieso finden diese als Tradition zu bezeichnenden Genres der Blasmusik in der Ausbildung keinen Platz? In der Zusammenfassung der beiden voraus gestellten Fragen lassen sich Schlussfolgerungen für die Ausbildung von Blasmusikdirigenten ziehen. [less ▲]

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See detailStudents’ perceptions of instructional quality: Validating 3 dimensions on a lesson-to-lesson basis
Talic, Irma UL; Möller, Jens; Niepel, Christoph UL

Scientific Conference (2020, January 17)

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See detailConditionality in the European Union External Migration Policy – A Critical Appraisal
Silga, Janine UL

Scientific Conference (2020, January)

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See detailJoint Power Allocation and Access Point Selection for Cell-free Massive MIMO
Vu, Thang Xuan UL; Chatzinotas, Symeon UL; ShahbazPanahi, Shahram et al

Scientific Conference (2020)

Cell-free massive multiple-input multiple-output (CF-MIMO) is a promising technological enabler for fifth generation (5G) networks in which a large number of access points (APs) jointly serve the users ... [more ▼]

Cell-free massive multiple-input multiple-output (CF-MIMO) is a promising technological enabler for fifth generation (5G) networks in which a large number of access points (APs) jointly serve the users. Each AP applies conjugate beamforming to precode data, which is based only on the AP's local channel state information. However, by having the nature of a (very) large number of APs, the operation of CF-MIMO can be energy-inefficient. In this paper, we investigate the energy efficiency performance of CF-MIMO by considering a practical energy consumption model which includes both the signal transmit energy as well as the static energy consumed by hardware components. In particular, a joint power allocation and AP selection design is proposed to minimize the total energy consumption subject to given quality of service (QoS) constraints. In order to deal with the combinatorial complexity of the formulated problem, we employ norm $l_{2,1}$-based block-sparsity and successive convex optimization to leverage the AP selection process. Numerical results show significant energy savings obtained by the proposed design, compared to all-active APs scheme and the large-scale based AP selection. [less ▲]

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See detailUnderstanding Walking Meetings: Drivers and Barriers
Damen, Ida; Lallemand, Carine UL; Brankaert, Rens et al

Scientific Conference (2020)

There is increased interest in reducing sedentary behavior of office workers to combat the negative health effects of prolonged sitting. Walking meetings offer a promising solution to this problem as they ... [more ▼]

There is increased interest in reducing sedentary behavior of office workers to combat the negative health effects of prolonged sitting. Walking meetings offer a promising solution to this problem as they facilitate a physically active way of working. To inform future development of technologies supporting these type of meetings, in-depth qualitative insights into people’s experiences of walking meetings are needed. We conducted semi-structured walking interviews (N=16) to identify key drivers and barriers for walking meetings in a living lab setting by using the ‘WorkWalk’. The ‘WorkWalk’ is a 1.8 km walking route indicated by a dotted blue line with outdoor meeting points, integrated into the room booking system. Our findings provide insights into how walking meetings are experienced and affect the set-up and social dynamics of meetings. We propose design recommendations for the development of future technologies and service design elements to support walking meetings and active ways of working. [less ▲]

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See detailMeeting Designers Where They Are: Using Industry Events as a Research Venue for HCI and Design Methods Development
Lockton, Dan; Lallemand, Carine UL

Scientific Conference (2020)

There is much work in the CHI community about the ‘industry-academia divide’, and how to bridge it. One key crossover between HCI/UX scientists and practitioners is the development and use of tools and ... [more ▼]

There is much work in the CHI community about the ‘industry-academia divide’, and how to bridge it. One key crossover between HCI/UX scientists and practitioners is the development and use of tools and methods—boundary objects between academia and practice. Among other forms of collaboration, there is an underdeveloped opportunity for academics to make use of industry events (conferences, meetups, design jams) as a research venue in the context of tool and method development. This paper describes three cases from work in academia-industry engagement over the last decade, in which workshops or experiments have been run at industry events as a way of trialling and developing tools directly with practitioners. We discuss advantages of this approach and extract key insights and practical implications, highlighting how the CHI community might use this method more widely, gathering relevant research outcomes while contributing to knowledge exchange between academia and practice. [less ▲]

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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 ▲]

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See detailA performance evaluation of weight-constrained conditioned portfolio optimization
Schiltz, Jang UL; Boissaux, Marc UL

Scientific Conference (2019, December 20)

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See detailFrom home to early childhood education: beliefs, language ideologies and OPOL
Kirsch, Claudine UL

Scientific Conference (2019, December 18)

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailWhy is the Market Skewness-Return Relationship Negative?
Lehnert, Thorsten UL

Scientific Conference (2019, December 13)

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we ... [more ▼]

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we consider the usual interpretation of e.g. option-implied skewness as an indicator of jump risk or downside risk. One possible explanation for this inconsistency is that there are factors affecting option-implied market skewness other than jump risk in the stock market. In this paper, I find that price pressure associated with “crowded trades” of mutual funds is an important endogenous factor. Given that retail investors are prone to herding, the directional trading of mutual funds is correlated, and their collective actions can generate short-term price pressure on aggregate stock prices. Short sellers systematically exploit these patterns not only in the equity lending market, but also in the options market. In line with this economic channel, I find that firstly, the significant negative relationship between market skewness and returns becomes insignificant, once I control for price pressure. Secondly, the negative relationship is only present for the “bad” downside component of risk-neutral skewness, associated with out-of-the-money put options. For the “good” upside component of risk-neutral skewness, associated with out-of-the-money call options, the relationship is always positive. Thirdly, price pressure affects the skewness-return relationship, which can be clearly distinguished from the impact of flows on the volatility-return relationship in terms of the leverage effect. [less ▲]

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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)

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailThe 2004 Afghan Constitution and Islam Merits and Challenges
Al Hajjaji, Shams Al Din UL

Scientific Conference (2019, November 11)

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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 ▲]

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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)

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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 ▲]

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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)

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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)

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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 ▲]

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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 ▲]

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See detailVon Eupen-Malmedy nach Ostbelgien. Eine deutsch-belgische Beziehungsgeschichte seit 1920
Brüll, Christoph UL

Scientific Conference (2019, November 01)

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See detailTowards Dynamic Zero Emission Zone Management for Plug-in Hybrid Buses
Seredynski, Marcin UL; Viti, Francesco UL

Scientific Conference (2019, November)

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailThe Occupied Museum. Culture and Science in Luxemburg during the Nazi Occupation, 1940–1944
Spirinelli, Fabio UL

Scientific Conference (2019, October 24)

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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 ▲]

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See detailInformation Content of Systematic and Idiosyncratic Risk Disclosure
Weber, Véronique UL; Muessig, Anke UL

Scientific Conference (2019, October 24)

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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: 37 (7 UL)
See detailrom Text to Bits: Making the Treaties of a Monk from the 16th Century "Understandable" to the Computer
Dubuisson, Bastian UL

Scientific Conference (2019, October 19)

Historians who aspire to explore texts with the help of the computer are more than often confronted to the absence of machine-readable corpora to suit their needs. As such, the early 16th century Latin ... [more ▼]

Historians who aspire to explore texts with the help of the computer are more than often confronted to the absence of machine-readable corpora to suit their needs. As such, the early 16th century Latin treaties about the city of Trier and its relics by the Benedictine monk Johannes Scheckmann are no exception. Despite their historical importance, among others for the study of the religious phenomenon during this pivotal era, these texts remain in their original form. Optical Character Recognition software makes it possible to overcome this gap by translating printed or handwritten characters into encoded glyphs, but not at any cost. Creating a digital corpus requires a careful reflection, particularly when it comes to small scale projects. Moreover, Latin being a highly inflected language, further post-processing steps such as tokenization and lemmatization are necessary in order to finally be able to process a corpus of texts with lines of code. During the digital transformation, each step leads to a profound but necessary modification of the original text and the creation of new data. The example of Scheckmann’s works illustrates what is lost when a text is turned into bits, as well as what can be discovered once the machine reads. [less ▲]

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

Scientific Conference (2019, October 19)

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

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

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See detailRussische 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 ▲]

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See detailDiscussion of "Do ETFs Increase Liquidity?" by Mehmet Saglam, Tugkan Tuzun and Russ Wermers
Holcblat, Benjamin UL

Scientific Conference (2019, October 18)

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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 ▲]

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See detailRegards allemands sur le Luxembourg
Brüll, Christoph UL

Scientific Conference (2019, October 17)

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

Scientific Conference (2019, October 17)

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See detailRegards belges sur le Luxembourg 1919-1921
Brüll, Christoph UL

Scientific Conference (2019, October 17)

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See detailApproche européenne sur l'entreprise : de la nouveauté ?
Corbisier, Isabelle UL

Scientific Conference (2019, October 17)

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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 ▲]

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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 ▲]

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See detailThe ESP estimator
Holcblat, Benjamin UL; Sowell, Fallaw

Scientific Conference (2019, October 08)

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See detailEFFECTS OF MULTIPLE OSCILLATOR PHASE NOISE IN PRECODING PERFORMANCE
Martinez Marrero, Liz UL

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 ▲]

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See detailL’UniGR-Center for Border Studies et ses outils d’analyse
Wille, Christian UL; Dethier, Perrine

Scientific Conference (2019, October)

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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)

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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 ▲]

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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 ▲]

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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: 19 (4 UL)