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See detailDesigning for Qualitative Interfaces: Experiences from Studio Education
Lockton, Dan; Lallemand, Carine UL; Menheere, Daphne

Scientific Conference (in press)

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See detailBuffer XDEM
Mainassara Chekaraou, Abdoul Wahid UL; Besseron, Xavier UL; Rousset, Alban UL et al

Scientific Conference (in press)

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See detailHyaku: A Qualitative Negotiation-Through-Interaction Interface to Support Runners in Achieving Balanced Training Sessions
Restrepo, Juan; Vos, Steven; Verhagen, Evert et al

Scientific Conference (in press)

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See detailTranslanguaging pedagogy and creative activism for early education in multilingual Luxembourg
Aleksic, Gabrijela UL

Scientific Conference (2022, September 07)

Luxembourg is a highly linguistically and culturally diverse country. In early education, there are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). From 2017 ... [more ▼]

Luxembourg is a highly linguistically and culturally diverse country. In early education, there are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). From 2017, multilingual early education is mandatory, which obliges teachers to develop children’s Luxembourgish, familiarizing them with French, and valuing their home languages. Therefore, the present project aimed to: (1) offer an 18-hours professional development (PD) course in translanguaging pedagogy to 40 teachers over 6 months, (2) strengthen home-school collaboration, and (3) support children’s linguistic, socio-emotional, and cognitive development and engagement in the classroom. The results from teacher questionnaires, focus groups, and interviews, showed that there was some positive change regarding the attitudes towards children’s home languages. The interviews with 17 parents indicated that there was a need for more home-school collaboration. The tests in early literacy and numeracy with 23 preschool children over one year, identified that children performed higher in their home languages. The video observations showed that when the teachers used children’s languages in the classroom, this impacted positively their well-being. Following the principles of creative activism, the author produced: (1) the website with over 100 practical activities on how teachers can involve children’s languages and families, (2) the illustrated book Sumak for parents, showing difficulties with integration in a new country, and (3) the illustrated book, Mara’s song for preschool children, showing how Mara finds her way in the new classroom. [less ▲]

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See detailIndicators for assessing the necessity of power system flexibility: a systematic review and literature meta‐analysis
Bhuiyan, Rajon UL; Weissflog, Jan; Schoepf, Michael et al

Scientific Conference (2022, September)

There are different flexibility options to align power systems to volatile feed-in of renewable electricity sources. The flexibility options differ in the dimensions of time, spatiality, and resource type ... [more ▼]

There are different flexibility options to align power systems to volatile feed-in of renewable electricity sources. The flexibility options differ in the dimensions of time, spatiality, and resource type. To make policy decisions on future energy systems, it is necessary to get a top-down indication of how much power system flexibility is needed. With the ongoing energy transition, there is yet no comprehensive overview of indicators that describe which dimension of flexibility will be necessary to what extent for different energy systems. Therefore, this paper provides a first overview of indicators that can be used to assess the necessity of power system flexibility. Thus, we do a systematic literature review to identify indicators that allow us to estimate the necessity of power system flexibility. We conduct a meta-analysis of these indicators and categorize them as indicators that either stand for an increasing or decreasing necessity of power system flexibility. Our paper can help inform policy, assess needed changes to system operations, increase stakeholder acceptance and investor confidence in implementing new technology and measures. [less ▲]

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See detailUnlinkability of an Improved Key Agreement Protocol for EMV 2nd Gen Payments
Horne, Ross James UL; Mauw, Sjouke UL; Yurkov, Semen UL

Scientific Conference (2022, August 10)

To address known privacy problems with the EMV standard, EMVCo have proposed a Blinded Diffie-Hellman key establishment protocol, which is intended to be part of a future 2nd Gen EMV protocol. We point ... [more ▼]

To address known privacy problems with the EMV standard, EMVCo have proposed a Blinded Diffie-Hellman key establishment protocol, which is intended to be part of a future 2nd Gen EMV protocol. We point out that active attackers were not previously accounted for in the privacy requirements of this proposal protocol, and demonstrate that an active attacker can compromise unlinkability within a distance of 100cm. Here, we adopt a strong definition of unlinkability that does account for active attackers and propose an enhancement of the protocol proposed by EMVCo. We prove that our protocol does satisfy strong unlinkability, while preserving authentication. [less ▲]

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See detailSOniCS: Interfacing SOFA and FEniCS for advanced constitutive models
Mazier, Arnaud UL; El Hadramy, Sidaty; Brunet, Jean-Nicolas et al

Scientific Conference (2022, August)

The Simulation Open Framework Architecture (SOFA) is a software environment for building simulations with a particular focus on real-time medical applications, e.g. surgery. Its scope is far broader than ... [more ▼]

The Simulation Open Framework Architecture (SOFA) is a software environment for building simulations with a particular focus on real-time medical applications, e.g. surgery. Its scope is far broader than the FEniCS Project, encompassing e.g. rigid body dynamics, interfacing with haptic devices, contact and visualisation. Naturally, it also includes some finite element models of soft tissue mechanics, but these capabilities are currently ‘pre-baked’ and limited to a few simple constitutive models. The goal of this work is to incorporate state-of-the-art code generation tools from the FEniCS Project into SOFA in order to hugely increase SOFA’s capabilities in terms of soft tissue mechanics. To this end we have developed a new SOFA plugin named SOniCS. For adding a new material model in SOniCS, the user describes its strain energy density function using UFL (Unified Form Language) syntax. Then, using FFCx (FEniCSx Form Compiler) we generate the C code associated with the kernels corresponding to the automatically differentiated cell-local residual and stiffness forms. Finally, we assemble these kernels in SOFA into global tensors and solve the resulting non-linear systems of equations. The result is that it is now possible to straightforwardly implement complex material models such as the Holzapfel-Ogden anisotropic model into SOFA, and to use them alongside SOFA’s existing strong feature set in medical simulation. [less ▲]

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See detailMultilingualism as Challenge for Luxembourgish Literary Historiography
Glesener, Jeanne UL

Scientific Conference (2022, July 29)

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See detailEtzels Vielvölkerhof – ein Modell europäisch vernetzter Herrschaft?
Bendheim, Amelie UL

Scientific Conference (2022, July 29)

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See detail"Mapping" biographies in relational databases - The case of Luxembourg soldiers in the Second World War
Janz, Nina UL

Scientific Conference (2022, July 25)

The Impact and Legacy of War Experiences in Luxembourg” researches the personal side of the history of Luxembourgish youth born between 1920 and 1927 who were enrolled into German services under the Nazi ... [more ▼]

The Impact and Legacy of War Experiences in Luxembourg” researches the personal side of the history of Luxembourgish youth born between 1920 and 1927 who were enrolled into German services under the Nazi occupation of Luxembourg during World War II. The research focuses on personal testimonies and their individual war experience to uncover these men, women, and families’ individual experiences. Using a relational database to represent their war experiences, we face several challenges, such as a data structure that is too rigid and strict to “map” the fluid and unpredictable life patterns of our study subjects. We developed a data model where we treat different life stations (military unit, POW camp etc.) as equal data levels like our recruits (as persons). Each “life station” or event we treat as a “person” and create a separate “biography” to include all relevant data. Afterwards, we link the life stations or events with the actual person in the database. The aim of my contribution is the “translation” of lives, with its twists and turns into a static data set such as a relational database to map the individual war experiences of our study object. [less ▲]

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See detailHigh-Performance Computing for the simulation of particles with the Discrete Element Method
Besseron, Xavier UL

Scientific Conference (2022, July 21)

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete ... [more ▼]

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete Element Method (DEM), a numerical method for the simulation of the motion of granular materials. We will cover the main parallelization paradigms and their implementations (shared memory with OpenMP and distributed memory with MPI), present the performance bottlenecks and introduce load-balancing techniques. [less ▲]

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See detailTranslanguaging pedagogy and creative activism for preschool teachers, parents, and children
Aleksic, Gabrijela UL

Scientific Conference (2022, July 14)

There are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). The government proclaimed multilingual early education mandatory in 2017, obliging teachers to develop ... [more ▼]

There are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). The government proclaimed multilingual early education mandatory in 2017, obliging teachers to develop children’s Luxembourgish, familiarizing them with French, and valuing their home languages. Thus, the present project was threefold: (1) to offer an 18-hours professional development (PD) course in translanguaging pedagogy to 40 teachers over 6 months, (2) to strengthen home-school collaboration, and (3) to support children’s linguistic, socio-emotional, and cognitive development and engagement in the classroom. The results from teacher questionnaires, focus groups, and interviews, showed that there was some positive change regarding the attitudes towards children’s home languages. The interviews with 17 parents indicated that there was a need for more home-school collaboration. The tests in early literacy and numeracy with 23 preschool children over one year, identified that children performed higher in their home languages. The video observations showed that every time the teacher used children’s languages in the classroom, this impacted positively their well-being. Following the principles of creative activism, the author produced three outcomes: (1) the website with over 100 practical activities on how teachers can involve children’s languages and families, (2) the illustrated book Sumak for parents, showing difficulties with integration in a new country, and (3) the illustrated book, Mara’s song for preschool children, showing how Mara, a girl who is laughed at because of her language and culture, finds her way through singing a song inspired by a bird. [less ▲]

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See detailJewish History and the Politics of Digitisation
Zaagsma, Gerben UL

Scientific Conference (2022, July 13)

This paper discusses the politics of Jewish Studies by focusing on the digitisation of Jewish cultural heritage and its effects for research into Jewish history(ies). In the past few years we have ... [more ▼]

This paper discusses the politics of Jewish Studies by focusing on the digitisation of Jewish cultural heritage and its effects for research into Jewish history(ies). In the past few years we have witnessed the emergence of what could be termed the critical turn in digital humanities with an increasing focus on how digital resources shape various parts of the research process and its outcomes. One aspect of that turn is more attention to digital source criticism and the politics of digitisation of cultural heritage. There are many aspects of digitisation that can be considered “political”, from selection for digitisation to modes of access to broader questions about the political aspects of infrastructure or ‘infrapolitics’. None of these is specific to our digital age nor to Jewish Studies, and historical context is crucially important.  This paper builds upon my recent reseach into the politics of digitisation and considers the case of Jewish Studies, framed within the broader context of the politics of heritage and its preservation. It set outs a number of broad parameters for discussion, with the aim to encourage further debate. Questions to be addressed include: what Jewish heritage is being digitised and which stories about the Jewish past can (and cannot) be told on its basis? Which players are involved in digitisation and how do both top-down national strategies and bottom-up community initiatives guide the process? How do memory politics influence selection processes? And how does transnational heritage fare in an age where many digitisation programs are nationally framed and funded? The paper will use the historical example of the digitisation of Yiddish heritage to illustrate these questions and provide a concrete example.  [less ▲]

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See detailIf there’s something strange in your [cyber]hood – who you gonna call?
Schmitz, Sandra UL

Scientific Conference (2022, July 07)

Detailed reference viewed: 22 (0 UL)
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See detailWhich Factors Play a Role in Coco Issuance? Evidence from European Banks.
Wolff, Christian UL

Scientific Conference (2022, July 06)

Detailed reference viewed: 19 (0 UL)
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See detailCentrality and city size effects on NO2 ground and tropospheric concentrations within European cities
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2022, July 06)

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See detailClimate Risk and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2022, July 05)

Detailed reference viewed: 55 (1 UL)
See detailEconomic Sanctions and International Investment Law: Investor and State Defences
Garcia Olmedo, Javier UL

Scientific Conference (2022, July 04)

This workshop examines the law and practice of economic sanctions in light of current developments in the Ukraine-Russia conflict. It explores the legality and implementation of, and possible challenges ... [more ▼]

This workshop examines the law and practice of economic sanctions in light of current developments in the Ukraine-Russia conflict. It explores the legality and implementation of, and possible challenges to, economic sanctions imposed by a number of international actors (including the US, the EU and the UK), as well as their potential impact on businesses and dispute resolution. [less ▲]

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See detailPourquoi les enseignants décident-ils de s'ouvrir aux familles ? résultats issus d'une consultation nationale au Grand-Duché du Luxembourg
Poncelet, Débora UL; Tinnes, Mélanie UL; Dierendonck, Christophe UL

Scientific Conference (2022, July 01)

En décembre 2021, une enquête, intitulée « Consultation des acteurs de l’école fondamentale. Une étude scientifique participative » a permis la collecte de données auprès des enseignants de l’école ... [more ▼]

En décembre 2021, une enquête, intitulée « Consultation des acteurs de l’école fondamentale. Une étude scientifique participative » a permis la collecte de données auprès des enseignants de l’école fondamentale et des éducateurs gradués. La thématique des relations école-famille a constitué un des aspects investigués dans l’étude. Depuis une vingtaine d’années, un intérêt croissant pour la thématique est observé. Une revue de la littérature récente (par exemple, Axford et al., 2019 ; Englund et al., 2004 ; Kim, Mok & Seidel, 2020, Roy & Giraldo-García, 2018 ; Huat See & Gorard, 2015), a montré à quel point les relations école-famille ainsi que l’engagement parental dans la scolarité de l’enfant pouvaient avoir une influence significative et positive à la fois sur les performances scolaires mais aussi sur des variables conatives (motivation scolaire, engagement ou adoption de comportements scolairement attendus). En outre, étant donné la grande diversité culturelle et socioéconomique des parents dont les enfants fréquentent l’école fondamentale comme la place accordée au partenariat avec les familles dans la loi scolaire, cette thématique est apparue comme incontournable pour le recueil de données. La théorie du comportement planifié (TCP) a été retenue comme un des modèles théorique et d’analyse des données collectées (voir exemple à ce sujet, Ajzen, 1991 ; Armitage et Conner, 2001). Ce modèle théorique vise à prédire et à expliquer un comportement au départ d’un processus cognitif et émotionnel incluant quatre éléments distincts : (1) les attitudes envers le comportement cible, (2) les normes subjectives en lien avec ce comportement, (3) le contrôle comportemental perçu et (4) l’intention d’adopter le comportement cible. Nous chercherons par conséquent à mettre en évidence l’intention des acteurs interrogés d’adopter des comportements propices à l’ouverture et à la communication envers les familles sur la base de leurs attitudes explicites. C’est ainsi que les conceptions et attitudes spécifiques, instrumentales comme affectives, ont été étudiées au départ de 6 items dont cinq sont originaux et un issu de l’instrument de Cárcamo-Vásquez & Rodríguez-Garcés (2015). En ce qui concerne les pratiques relatives à la relation école-famille, elles ont été observées par le biais de deux aspects : 1) la qualité des relations école-famille actuelles telles que perçues par les répondants (Vickers & Mincke, 1995 ; Dawson & Wymbs, 2016) et 2) les actions mises en œuvre pour susciter l’engagement des parents dans l’éducation scolaire de leur enfant soit à domicile, soit à l’école, soit par le biais des communications avec l’école (Hoover-Dempsey & Sandler, 2005 ; Manz, Fantuzzo & Power, 2004). Après avoir décrit la population interrogée et fournit des informations importantes sur le contexte de l’institution scolaire luxembourgeoise en matière d’hétérogénéité des publics, nous présenterons les premiers résultats de l’enquête en ce qui concerne la thématique des relations école-famille selon la théorie du comportement planifié. Bibliographie Ajzen, I. (1991). The theory of planned behavior. Organizational Behavior and Human Decision Processes, 50, 179–211. https://doi: 10.1016/0749-5978(91)90020-T Armitage, C. & Conner, M. (2001). Efficacy of the Theory of Planned Behaviour: A meta-analytic review. British Journal of Social Psychology, 40, 471-499. https://doi.org/10.1348/014466601164939 Axford, N., Berry, V., Lloyd, J., Moore, D., Rogers, M., Hurst, A., Blockley, K., Durkin,H. and Minton, J. (2019). How Can Schools Support Parents’ Engagement in their Children’s Learning? Evidence from Research and Practice. London: Education Endowment Foundation. Report available from: https://educationendowmentfoundation.org.uk/evidence-summaries/evidence-reviews/parental-engagement/ (retrieved February 2022). Cárcamo-Vásquez, H., Rodríguez-Garcés, C. (2015). Rol parental educativo: aproximación a las percepciones que poseen los futuros profesores. Educ., 18(3), 456-470. https://DOI: 10.5294/edu.2015.18.3.5 Dawson, A. E., & Wymbs, B. T. (2016). Validity and Utility of the Parent–Teacher Relationship Scale–II. Journal of Psychoeducational Assessment, 34(8), 751–764. https://doi.org/10.1177/0734282915627027   Englund, M. M., Luckner, A. E., Whaley, G. J. L., & Egeland, B. (2004). Children's Achievement in Early Elementary School: Longitudinal Effects of Parental Involvement, Expectations, and Quality of Assistance. Journal of Educational Psychology, 96(4), 723–730. https://doi.org/10.1037/0022-0663.96.4.723 Hoover-Dempsey, K.V., & Sandler, H.M. (2005). Final Performance Report for OERI Grant # R305T010673. The Social Context of Parental Involvement: A Path to Enhanced Achievement. Presented to Project Monitor, Institute of Education Sciences, U.S. Department of Education, March 22, 2005. Huat See, B., & Gorard, S. (2015). The role of parents in young people’s education—a critical review of the causal evidence. Oxford Review of Education, 41, 346-366. Kim, Y., Mok, S.Y., & Seidel, T. (2020). Parental influences on immigrant students' achievement-related motivation and achievement: A meta-analysis. Educational Research Review, 30, 1-19. https://doi.org/10.1016/j.edurev.2020.100327 Manz, P. H., Fantuzzo, J. W., & Power, T. J. (2004). Multidimensional assessment of family involvement among urban elementary students. Journal of School Psychology, 42(6), 461–475. https://doi.org/10.1016/j.jsp.2004.08.002 Roy, M., & Giraldo-García, R. (2018). The role of parental involvement and social/emotional skills in academic achievement: Global perspectives. The School Community Journal, 28(2), 29–46. Vickers, H. S., & Minke, K. M. (1995). Exploring parent-teacher relationships: Joining and communication to others. School Psychology Quarterly, 10(2), 133–150. https://doi.org/10.1037/h0088300 [less ▲]

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See detailAutonomous control for satellite rendezvous in near-Earth orbits
Muralidharan, Vivek UL; Martinez Luna, Carol UL; Zinys, Augustinas et al

Scientific Conference (2022, July)

CubeSats are being deployed for a number of activities including Earth observation, telecommunications, scientific experiments, and due to their low cost and flexibility, more often than not, they are ... [more ▼]

CubeSats are being deployed for a number of activities including Earth observation, telecommunications, scientific experiments, and due to their low cost and flexibility, more often than not, they are even being considered for use in On-Orbit Servicing (OOS) and debris removal missions. This investigation focuses on using the CubeSat technology to perform autonomous proximity operations with passive target bodies including satellites or space debris. The nonlinear coupled attitude and orbit dynamics for the chaser and the target bodies are modelled and simulated. A nonlinear optimal controller identifies an appropriate rendezvous path. A vision-based navigation system on the chaser satellite records the pose of the target body. The pose observations with stochastic uncertainties are processed using a Kalman filter, and offer state feedback along the satellite path. Such observations in conjunction with the postulated linear control algorithm anchor the chaser to approach the target by maintaining appropriate relative configuration. The linear controller delivers regular maneuvers to compensate for any deviations from the identified reference path. A close-range rendezvous operation is illustrated in a Mission Design Simulator (MDS) tool. [less ▲]

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See detailPotentials of sector coupling to improve the resilience of electricity and gas networks
Leinauer, Christina; Hanny, Lisa; Bhuiyan, Rajon UL et al

Scientific Conference (2022, July)

Global warming leads to an increase in extreme weather events that considerably threaten critical infrastructures (e.g., electricity or gas networks). The failure of one critical infrastructure may have ... [more ▼]

Global warming leads to an increase in extreme weather events that considerably threaten critical infrastructures (e.g., electricity or gas networks). The failure of one critical infrastructure may have far-reaching consequences triggering a “cascade of failures” that affects other critical infrastructures. As extreme weather events usually hit affected regions unexpectedly, flexibility in energy systems is key to sustain resilience and rapidly respond to changing conditions, e.g., failed network lines. Hence, we analyze sector coupling (SC) as one option to increase flexibility and exploit synergies between electricity and gas networks. We investigate SC investments that allow for a bi-directional conversion of gas and electricity in the form of gas-fired power plants or power-to-X technologies and their effect on resilience. We propose a two-level market model where, in the upper-level problem, long-term investments in SC technologies are made in anticipation of short-term market clearing as well as uncertain failures and, in the lower-level problem, SC technologies may be activated. We model extreme weather events as a set of discrete scenarios that pose an external risk to the energy system. In our paper, we derive optimal SC investments representing a trade-off between enhancing system resilience and increasing investments. Moreover, we derive optimal SC responses for selected weather events to guide the operation of SC plants under extreme conditions. [less ▲]

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See detailTowards real-time patient-specific breast simulations: from full-field information to surrogate model
Mazier, Arnaud UL; Lavigne, Thomas UL; Lengiewicz, Jakub UL et al

Scientific Conference (2022, July)

In breast cancer treatment, surgery is one of the most common practices [DeSantis et al., 2019]. The surgery involves a complex pipeline, principally due to the difference between the imaging and the ... [more ▼]

In breast cancer treatment, surgery is one of the most common practices [DeSantis et al., 2019]. The surgery involves a complex pipeline, principally due to the difference between the imaging and the surgical posture [Mazier et al., 2021]. Indeed, because of the stance difference, the surgeon has to rely on radioactive or invasive markers to predict the tumor position in the surgical setup. Biomechanical simulations could predict such complex tumor displacements but often require patient-specific data (material properties, organs geometries, or loading and boundary conditions). Full-field acquisitions coupled with landmark identifications allow obtaining relative deformation between the different configurations. Having this information and assuming a finite element model, an identification procedure of the model parameters can be carried out. Finally, finding a suitable computational model allowing for a compromise between accuracy and speed, one may consider surrogate models for real-time simulations (20 to 50 FPS). In this work, we obtained the patient-specific geometry through micro-computed tomography in 8 different configurations, including 15 bio-markers. Assessing the displacement of the bio-markers enabled us to infer the relative strains between the different configurations. A heterogeneous neo-Hookean model was assumed for simulating soft tissue behavior. Based on the displacements and the position of the biomarkers, model parameters identification was performed to calibrate the experimental data with the finite element method results. To overcome speed performance issues, Convolutional Neural Network (CNN) trained with a synthetic simulation-based dataset generated by applying different gravity directions is used. Preliminary results show that CNN can predict the displacement of anatomical landmarks to millimetric precision and is 100 times faster than the finite element method, satisfying our real-time objective. Plus, the use of Bayesian inferences involves a longer prediction time but allows a 95% confidence interval of the biomarkers' displacements. For a given precision, contrary to CNNs, optimization methods are computationally expensive and depend on an initialization point. Although CNNs require new training for each patient, optimization algorithms can be applied regardless of the patient's geometry. Through this study, we observed that material properties were playing an essential role but not as much as the anatomical structures e.g. infra-mammary or Copper’s ligaments. [less ▲]

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See detailLe travail frontalier "à distance" : les enjeux du télétravail et des espaces de coworking dans un espace transfrontalier
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid

Scientific Conference (2022, June 30)

The objective of this paper is to identify the economic and social challenges of telework in the context of a cross-border labor market : Greater Region SaarLorLux, a cross-border area including ... [more ▼]

The objective of this paper is to identify the economic and social challenges of telework in the context of a cross-border labor market : Greater Region SaarLorLux, a cross-border area including Luxembourg, Lorraine (in France), Saarland and Rhineland Palatinate (in Germany) and Wallonia (in Belgium). This area is strongly concerned by the flows of border workers (nearly 260,000 in 2021). Teleworking has been imposed by the pandemic and is not without raising a certain number of questions: legal, social, fiscal.... linked to the presence of the border between the place of residence and the place of work. In a context of mobility and congestion problems, another form of remote work has developed in recent years : coworking spaces. This paper aims to discuss these two organizational modalities of teleworking, but also their challenges for the development of the border territories of both residence and work. [less ▲]

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See detailWeb archives of the COVID-crisis : challenges related to short-term and long-term readability
Schafer, Valerie UL

Scientific Conference (2022, June 29)

During the COVID-19 crisis many institutions have started live and special collections related to web archives of the pandemic. Many libraries have also been involved in an initiative led by the IIPC ... [more ▼]

During the COVID-19 crisis many institutions have started live and special collections related to web archives of the pandemic. Many libraries have also been involved in an initiative led by the IIPC (International Internet Preservation Consortium) to gather a huge international collection of web archives available through Archive-It. Taking as a starting point two research projects related to the analysis of the web archiving of the COVID crisis, that we conducted within WARCnet and through the AWAC2 cohort program, this presentation will focus on issues related to scalable reading, contextualization of datasets, FAIR data, sustainability, inclusiveness, etc., in order to unfold the challenges of these collections and of their analysis in a short and in a long term perspective. [less ▲]

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See detailDemocracy and the digital revolution – steering an evolving paradigm
Danescu, Elena UL

Scientific Conference (2022, June 29)

Knowledge-based societies rely to a large extent on intangible assets and digital technologies, and these are having an increasing impact on information systems, power, governance and citizenship, driven ... [more ▼]

Knowledge-based societies rely to a large extent on intangible assets and digital technologies, and these are having an increasing impact on information systems, power, governance and citizenship, driven by a proliferation of stakeholders and networks at multiple levels (states, international organisations, private companies, civil society and citizens. There is a clear need for international regulation in this area. This paper takes a multidisciplinary approach, combining an examination of theoretical, conceptual and methodological frameworks with an analysis of relevant public and private archives, with a threefold objective: 1) to outline issues and challenges in terms of human rights, freedom and democracy; 2) to identify the regulatory provisions adopted at European and international level to promote accountability, civic engagement and digital literacy through new forms of (mediated) democracy; and 3) to identify future prospects, risks and uncertainties in the era of artificial intelligence. [less ▲]

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See detailWhich Factors Play a Role in Coco Issuance? Evidence from European Banks.
Wolff, Christian UL

Scientific Conference (2022, June 20)

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See detailBackscatter-Aided NOMA V2X Communication under Channel Estimation Errors
Khan, Wali Ullah UL; Jamshed, Muhammad Ali; Mahmood, Asad UL et al

Scientific Conference (2022, June 20)

Backscatter communications (BC) has emerged as a promising technology for providing low-powered transmissions in nextG (i.e., beyond 5G) wireless networks. The fundamental idea of BC is the possibility of ... [more ▼]

Backscatter communications (BC) has emerged as a promising technology for providing low-powered transmissions in nextG (i.e., beyond 5G) wireless networks. The fundamental idea of BC is the possibility of communications among wireless devices by using the existing ambient radio frequency signals. Non-orthogonal multiple access (NOMA) has recently attracted significant attention due to its high spectral efficiency and massive connectivity. This paper proposes a new optimization framework to minimize total transmit power of BC-NOMA cooperative vehicle-to-everything networks (V2XneT) while ensuring the quality of services. More specifically, the base station (BS) transmits a superimposed signal to its associated roadside units (RSUs) in the first time slot. Then the RSUs transmit the superimposed signal to their serving vehicles in the second time slot exploiting decode and forward protocol. A backscatter device (BD) in the coverage area of RSU also receives the superimposed signal and reflect it towards vehicles by modulating own information. Thus, the objective is to simultaneously optimize the transmit power of BS and RSUs along with reflection coefficient of BDs under perfect and imperfect channel state information. The problem of energy efficiency is formulated as non-convex and coupled on multiple optimization variables which makes it very complex and hard to solve. Therefore, we first transform and decouple the original problem into two sub-problems and then employ iterative sub-gradient method to obtain an efficient solution. Simulation results demonstrate that the proposed BC-NOMA V2XneT provides high energy efficiency than the conventional NOMA V2XneT without BC. [less ▲]

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See detailWhen RIS Meets GEO Satellite Communications: A New Sustainable Optimization Framework in 6G
Khan, Wali Ullah UL; Lagunas, Eva UL; Mahmood, Asad UL et al

Scientific Conference (2022, June 19)

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the ... [more ▼]

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the signal propagation by using passive reflecting elements. On the other side, the demand of high throughput geostationary (GEO) satellite communications (SatCom) is rapidly growing to deliver broadband services in inaccessible/insufficient covered areas of terrestrial networks. This paper proposes a GEO SatCom network, where a satellite transmits the signal to a ground mobile terminal using multicarrier communications. To enhance the effective gain, the signal delivery from satellite to the ground mobile terminal is also assisted by RIS which smartly shift the phase of the signal towards ground terminal. We consider that RIS is mounted on a high building and equipped with multiple re-configurable passive elements along with smart controller. We jointly optimize the power allocation and phase shift design to maximize the channel capacity of the system. The joint optimization problem is formulated as nonconvex due to coupled variables which is hard to solve through traditional convex optimization methods. Thus, we propose a new optimal algorithm which is based on Mesh Adaptive Direct Search to obtain an efficient solution. Simulation results unveil the benefits of RIS-assisted SatCom in terms of system channel capacity. [less ▲]

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See detailArea-Power Analysis of FFT Based Digital Beamforming for GEO, MEO, and LEO Scenarios
Palisetty, Rakesh UL; Eappen, Geoffrey UL; Gonzalez Rios, Jorge Luis UL et al

Scientific Conference (2022, June 19)

Satellite communication systems can provide seamless wireless coverage directly or through complementary ground terrestrial components and are projected to be incorporated into future wireless networks ... [more ▼]

Satellite communication systems can provide seamless wireless coverage directly or through complementary ground terrestrial components and are projected to be incorporated into future wireless networks, particularly 5G and beyond networks. Increased capacity and flexibility in telecom satellite payloads based on classic radio frequency technology have traditionally translated into increased power consumption and dissipation. Much of the analog hardware in a satellite communications payload can be replaced with highly integrated digital components that are often smaller, lighter, and less expensive, as well as software reprogrammable. Digital beamforming of thousands of beams simultaneously is not practical due to the limited power available onboard satellite processors. Reduced digital beamforming power consumption would enable the deployment of a full digital payload, resulting in comprehensive user applications. Beamforming can be implemented using matrix multiplication, hybrid methodology, or a discrete Fourier transform (DFT). Implementing DFT via fast Fourier transform (FFT) reduces the power consumption, process time, hardware requirements, and chip area. Therefore, in this paper, area-power efficient FFT architectures for digital beamforming are analyzed. The area in terms of look up tables (LUTs) is estimated and compared among conventional FFT, fully unrolled FFT, and a 4-bit quantized twiddle factor (TF) FFT. Further, for the typical satellite scenarios, area, and power estimation are reported. [less ▲]

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See detailJewish History and the Politics of Digitisation
Zaagsma, Gerben UL

Scientific Conference (2022, June 17)

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See detailEconomic Ideas and Political Action in Shaping Economic and Monetary Union: Pierre Werner and Luxembourg
Danescu, Elena UL

Scientific Conference (2022, June 16)

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the ... [more ▼]

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the establishment of Community institutions and European funding institutions in the country. As Luxembourg was in a currency union with Belgium within the Belgium-Luxembourg Economic Union and did not have its own Central Bank, these developments were all the more meaningful. When the European integration process experienced a series of major crises – including the failure of the European Defence Community and European Political Community in 1954, the empty chair crisis in 1966 and General de Gaulle’s veto on British accession in 1962 and 1967 –, Luxembourg set out on the path of European monetary integration, under the impetus of Finance Minister and Prime Minister Pierre Werner. In October 1970, the Werner Report provided a detailed blueprint for Economic and Monetary Union and laid the foundations for the euro. The Luxembourg financial centre would serve as a “laboratory” for the future single currency. This paper makes extensive use of relevant European and international archives and original interviews, adopting an interdisciplinary approach to analyse Luxembourg’s leading role in reconciling different views on EMU and fostering political commitment to a European currency among the Member States. [less ▲]

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See detailClimate Risk and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2022, June 13)

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See detailStudying transnational events through web archives
Schafer, Valerie UL

Scientific Conference (2022, June 13)

This presentation was an update of the work of WG2 related to web archives and transnational events I'm leading within the WARCnet project.

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See detailWhen Cryptographic Ransomware Poses Cyber Threats: Ethical Challenges and Proposed Safeguards for Cybersecurity Researchers
Botes, Wilhelmina Maria UL; Lenzini, Gabriele UL

Scientific Conference (2022, June 10)

Cryptographic ransomware, a malware capable of destroying data, is a serious threat if used against providers of critical infrastructures such as healthcare, energy supply chains, banking services, and ... [more ▼]

Cryptographic ransomware, a malware capable of destroying data, is a serious threat if used against providers of critical infrastructures such as healthcare, energy supply chains, banking services, and transport systems. Used as such, ransomware may qualify as cyber weapon, but the current discussion around cyber and information warfare is not sufficiently legally regulated. This delegates the safe governance thereof to the application of ethical principles but leaves researchers working on ransomware in doubt about the double-use nature of their work and what code of conduct to follow. Although some existing biomedical research ethical principles have been repurposed for ICT research, in the context of recent threats posed by ransomware attacks, these efforts need an urgent rethink, especially when it involves the research of cybersecurity researchers dealing specifically with ransomware. This paper does not offer solutions, but rather describes the complexity, nature and extent of ethical challenges raised by cybersecurity research and invites the cybersecurity research community to enter into active discussions around the need to consider the development of an appropriate research ethics framework in the domain of cybersecurity. [less ▲]

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See detailTélétravail et mobilités dans un contexte transfrontalier
Pigeron-Piroth, Isabelle UL

Scientific Conference (2022, June 09)

La Grande Région SaarLorLux se caractérise par d’intenses flux de travailleurs frontaliers qui représentent près d’un quart des flux de travail frontalier de l’ensemble de l’UE. La pandémie de Covid-19 et ... [more ▼]

La Grande Région SaarLorLux se caractérise par d’intenses flux de travailleurs frontaliers qui représentent près d’un quart des flux de travail frontalier de l’ensemble de l’UE. La pandémie de Covid-19 et le confinement total débuté en mars 2020 ont eu pour conséquence de développer le recours massif au télétravail y compris dans cet espace traversé par plusieurs frontières. Cette plongée brutale et soudaine dans le télétravail a attiré l’attention sur cette forme d’organisation du travail, assez peu utilisée et étudiée jusqu’alors. La question se pose désormais de voir comment va évoluer cette forme de travail dans un contexte transfrontalier, compte tenu des multiples règlementations en vigueur (fiscales, sécurité sociale…), par ailleurs diverses selon les pays concernés (de travail comme de résidence). Le débat a notamment été relancé avec la récente résolution européenne déposée à l’Assemblée Nationale française visant à l’augmentation du télétravail des travailleurs frontaliers et à mener une réflexion européenne sur leur statut (texte adopté n°819). Il importe alors de tenir compte des effets du télétravail sur les travailleurs frontaliers en place mais aussi sur les évolutions du travail frontalier. Doit-on s’attendre à une forte hausse du travail frontalier si le télétravail se généralise ? Comment seront alors impactées les mobilités des frontaliers ? L’objectif de la présente communication est de dresser une liste des effets potentiels du télétravail sur les mobilités (quotidiennes et résidentielles) dans un contexte transfrontalier. Comment le télétravail peut-il impacter les pratiques de mobilités des frontaliers ? constitue-t-il une solution envisageable et réaliste face aux problèmes de congestion autour du Luxembourg ? ou y a-t-il des effets-rebonds qui nuanceraient cet impact du télétravail sur les mobilités? Autant de questions qui constituent une étape préliminaire avant toute tentative de mesure ou de prise en compte de l’effet télétravail dans l’analyse du marché du travail transfrontalier dans la Grande Région. Méthodologie En partant d’une analyse de la littérature sur le sujet, souvent abordé de manière « nationale » donc sans tenir compte des particularités liées aux frontières, nous complèterons ce tour d’horizon par nos propres travaux sur la question et notre connaissance du contexte transfrontalier. Principaux résultats obtenus ou attendus Une réflexion générale sera engagée quant aux effets attendus du télétravail sur les mobilités transfrontalières, à la fois au niveau macro, meso et micro. Il importera de distinguer les impacts sur les travailleurs frontaliers déjà en place et sur ceux qui sont potentiellement candidats à un emploi transfrontalier, mais aussi de tenir compte du fait que tous les emplois ne sont pas télétravaillables par exemple (selon le secteur ou le type d’emploi). Cet inventaire détaillé nous permettra de conclure sur l’intérêt de la prise en compte de la variable télétravail dans les futures analyses du travail frontalier, mais également nous fournira des pistes d’études concrètes à réaliser. [less ▲]

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See detailHEAT AND MASS TRANSFER BETWEEN XDEM & OPENFOAM USING PRECICE COUPLING LIBRARY
Adhav, Prasad UL; Besseron, Xavier UL; Estupinan Donoso, Alvaro Antonio UL et al

Scientific Conference (2022, June 09)

This work demonstrates the rapid development of a simulation environment to achieve Heat and Mass Transfer (HMT) between Discrete Element Methods (DEM) and Computa- tional Fluid Dynamics (CFD). The HMT ... [more ▼]

This work demonstrates the rapid development of a simulation environment to achieve Heat and Mass Transfer (HMT) between Discrete Element Methods (DEM) and Computa- tional Fluid Dynamics (CFD). The HMT coupling can be employed to simulate processes such as drying, pyrolysis, combustion, melting, solid-fluid reactions etc and have indus- trial applications such as biomass furnaces, boilers, heat exchangers, and flow through packed beds. This shows that diverse CFD features and solvers need to be coupled with DEM in order to achieve various applications mentioned above. The proposed DEM-CFD Eulerian-Lagrangian coupling for heat and mass transfer is achieved by employing the preCICE coupling library[1] on volumetric meshes. In our prototype, we use the eXtended Discrete Element Method (XDEM)[2] for handling DEM calculations and OpenFOAM for the CFD. The XDEM solver receives various CFD data fields such as fluid properties, and flow conditions exchanged through preCICE, which are used to set boundary conditions for particles. Various heat transfer and mass transfer laws have been implemented in XDEM to steer HMT source term computations. The heat and mass source terms computed by XDEM are transferred to CFD solver and added as source. These source terms represent particles in CFD. The generic coupling interface of preCICE, XDEM and its adapter allows to tackle a di- verse range of applications. We demonstrate the heat, mass & momentum coupling capa- bilities through various test cases and then compared with our legacy XDEM-OpenFOAM coupling and experimental results. [less ▲]

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See detailUnsupervised Learning for User Scheduling in Multibeam Precoded GEO Satellite Systems
Ortiz Gomez, Flor de Guadalupe UL; Lagunas, Eva UL; Chatzinotas, Symeon UL

Scientific Conference (2022, June 09)

Future generation SatCom multibeam architectures will extensively exploit full-frequency reuse schemes together with interference management techniques, such as precoding, to dramatically increase ... [more ▼]

Future generation SatCom multibeam architectures will extensively exploit full-frequency reuse schemes together with interference management techniques, such as precoding, to dramatically increase spectral efficiency performance. Precoding is very sensitive to user scheduling, suggesting a joint precoding and user scheduling design to achieve optimal performance. However, the joint design requires solving a highly complex optimization problem which is unreasonable for practical systems. Even for suboptimal disjoint scheduling designs, the complexity is still significant. To achieve a good compromise between performance and complexity, we investigate the applicability of Machine Learning (ML) for the aforementioned problem. We propose three clustering algorithms based on Unsupervised Learning (UL) that facilitate the user scheduling decisions while maximizing the system performance in terms of throughput. Numerical simulations compare the three proposed algorithms (K-means, Hierarchical clustering, and Self-Organization) with the conventional geographic scheduling and identify the main trade-offs. [less ▲]

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See detailDevelopment of an HPC Multi-Physics Biomass Furnace Simulation and Integration in a Cloud-based Workflow
Besseron, Xavier UL; Henrik, Rusche; Peters, Bernhard UL

Scientific Conference (2022, June 09)

Biomass combustion offers a credible alternative to reduce the consumption of fossil fuels. To optimize the biomass combustion process and improve the design of biomass furnaces numerical simulation is a ... [more ▼]

Biomass combustion offers a credible alternative to reduce the consumption of fossil fuels. To optimize the biomass combustion process and improve the design of biomass furnaces numerical simulation is a less expensive and time-effective approach as opposed to the experimental method. However, the combustion in a biomass furnace involves intricate physical phenomena that must be modeled (and validated) carefully, in the fuel bed (with particle motion and shrinking, heat transfer, drying, pyrolysis, gasification) and in the surrounding gas (with turbulence, combustion, radiation). With this level of complexity, and to be conducted in a reasonable time, the simulation of industrial biomass furnaces requires the use of High-Performance Computing (HPC) platforms and expertise, which is usually not affordable for manufacturing SMEs. To address this issue, we developed a configurable digital twin of a biomass furnace running on HPC and we designed a cloudified easy-to-use end-to-end workflow. This fully automated workflow, from user input to results analysis, has been integrated into the digital marketplace of the CloudiFacturing EU project and is now directly available to SMEs via a Cloud portal. With this presentation, we want to offer a glance at the internal details and enabling technologies used in our parallel coupled application and scientific workflow. Our parallel simulation tool for biomass furnaces combines OpenFOAM (for the gas phase) parallelized with MPI and XDEM (for the solid wood particles) parallelized with OpenMP. The two libraries are coupled in parallel using an original approach based on the co-located partitioning strategy which has been tailored to minimize communications. As for the cloud workflow, it is based on an all-in-one Singularity image containing all the software, scripts, and data required to prepare the simulation input, execute the computation-intensive simulation, and analyze the results. Finally, we present the lessons learned from the development of this complex workflow and highlight the remaining challenges related to HPC multi-physics coupled simulations. [less ▲]

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See detailA survey of EMI lecturer training programmes: content, delivery, ways forward.
Deroey, Katrien UL

Scientific Conference (2022, June 09)

This talk will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training by surveying published initiatives worldwide (Deroey, 2021). Although EMI is not a recent ... [more ▼]

This talk will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training by surveying published initiatives worldwide (Deroey, 2021). Although EMI is not a recent phenomenon, many higher education institutions are only now beginning to organize specific support for EMI lecturers. EAP practitioners are often tasked with providing such support, since the perception commonly is that language is the main issue requiring improvement. However, the efficient design and delivery of EMI lecturing training and support is a complex challenge. First, most literature highlights the need for pedagogical and communication training in addition to language work. Second the varied EMI context means training should be adapted to the local cultural, educational, linguistic and institutional contexts (Herington, 2020; Martinez & Fernandes, 2020; Tuomainen, 2018). Third, we need to be sensitive to lecturers’ attitudes towards EMI and EMI training (Tsui, 2018). Fourth, there are practical considerations such as the timely provision of support (Guarda & Helm, 2017); promoting participation; facilitating learning transfer to lectures; and working with what are usually heterogeneous participant groups in terms of English proficiency, (EMI) lecturing experience and discipline (Ball & Lindsay, 2013). Finally, the design of these programmes typically needs to happen with very limited institutional resources, few (if any) published materials and relatively little published research on lecture discourse and EMI lecturer training. Having surveyed the main components, formats and work forms of the programmes, the conclusion highlights ways forward in EMI lecturer training that emerge from this analysis. References Ball, P., & Lindsay, D. (2013). Language demands and support for English-medium instruction in tertiary education. Learning from a specific context In A. Doiz, D. Lasagabaster, & J. M. Sierra (Eds.), English-medium instruction at universities: Global challenges (pp. 44-61). Multilingual Matters. Deroey, K. L. B. (2021). Lecturer training for English Medium Instruction: what and how? In B. D. Bond, A. & M. Evans (Ed.), Innovation, exploration and transformation. Proceedings of the 2019 BALEAP Conference (pp. 245-253). Garnet. Guarda, M., & Helm, F. (2017). A survey of lecturers’ needs and feedback on EMI training. In K. Ackerley, M. Guarda, & F. Helm (Eds.), Sharing perspectives on English-medium instruction (pp. 167-194). Peter Lang. Herington, R. (2020). Observation as a tool to facilitate the professional development of teaching faculty involved in English as a Medium of Instruction: trainer and trainee perspectives. In M. L. Carrió-Pasto (Ed.), Internationalising Learning in Higher Education (pp. 65-82). IGI Global. Martinez, R., & Fernandes, K. (2020). Development of a teacher training course for English medium instruction for higher education professors in Brazil. In M. Del Mar Sánchez-Pérez (Ed.), Teacher Training for English-Medium Instruction in Higher Education (pp. 125-152). IGI Global. Tuomainen, S. (2018). Supporting non-native university lecturers with English-medium instruction. Journal of Applied Research in Higher Education, 10(3), 230-242. [less ▲]

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See detailA CutFEM Method for a Mechanistic Modelling of Astrocytic Metabolism in 3D Physiological Morphologies
Farina, Sofia UL; Voorsluijs, Valerie UL; Claus, Susanne et al

Scientific Conference (2022, June 07)

Investigating neurodegenerative diseases can be done complementary through biological and computational experiments. A good computational approach describing a simplification of the reality and focusing ... [more ▼]

Investigating neurodegenerative diseases can be done complementary through biological and computational experiments. A good computational approach describing a simplification of the reality and focusing only on some features of the problem can help getting insights on the field. The question addressed in our work is the role of astrocytes in neurodegeneration. These cells have two interesting characteristics that we want to investigate in our model: first, their role as metabolic mediator between neurons and blood vessels and second, their peculiar morphology. In fact, metabolic dysfunctions and morphological changes have been noticed in astrocyte affected by neuropathology. Computationally the main difficulty arising from solving a metabolic model into cellular shape comes from the complexity of the domain. The shape of astrocytes are very ramified, with thin branches and sharp edges. As shown in our previous work \cite{Farina}, a \cutfem{} \cite{Burman} approach is a suitable tool to deal with this issue. In our latest work we use real human three-dimensional astrocyte morphologies obtained via microscopy \cite{Salamanca} as domain to solve our system. The performed simulations highlight the effect of morphological changes on the system output. Suggesting that our model can be crucial in understanding the morphological-dependency in neuropathologies and that the spatial component cannot be neglected. [less ▲]

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See detailUsing Bayes factors to compare dynamical models of hydrological systems
Mingo Ndiwago, Damian UL; Nijzink, Remko; Ley, Christophe UL et al

Scientific Conference (2022, June 05)

Detailed reference viewed: 22 (5 UL)
See detail"Hybrid is the new normal." Einblicke in die Projekte des Luxembourg Centre for Contemporary and Digital History am Beispiel der virtuellen Ausstellungen ww1.lu, zeitschichten.be und minett-stories.lu
Brüll, Christoph UL

Scientific Conference (2022, June 03)

Seinen Forschungsschwerpunkt in der digitalen Geschichte trägt das 2017 gegründete C²DH bereits im Namen. Überlegungen zu den methodologischen Herausforderungen des Digitalen für die ... [more ▼]

Seinen Forschungsschwerpunkt in der digitalen Geschichte trägt das 2017 gegründete C²DH bereits im Namen. Überlegungen zu den methodologischen Herausforderungen des Digitalen für die Geschichtswissenschaft stehen bei seiner Arbeit genauso im Mittelpunkt wie das Nachdenken über den Einsatz digitaler Mittel bei der Vermittlung von Zeitgeschichte. Bei dieser Digital Public History spielen besonders die so genannten virtuellen Ausstellungen eine große Rolle. Der Vortrag bettet diese in einem ersten Teil in die konzeptionelle Ausrichtung des C²DH ein, bevor im zweiten Teil drei Ausstellungen vorgestellt werden: zum Ersten Weltkrieg in Luxemburg (2018), zur Geschichte Ostbelgiens seit 1920 (2020) und zur Sozial- und Industriegeschichte im luxemburgisch-französischen Grenzgebiet (2022). Besondere Aufmerksamkeit kommt der Problematisierung der Nutzung von Archivquellen in diesen Ausstellungen zu – sowohl im Zusammenspiel mit anderen (v.a. audiovisuellen) Quellen als auch aus methodischer und didaktischer Perspektive. [less ▲]

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See detailExploring the History of Digital History: Setting an Agenda
Zaagsma, Gerben UL

Scientific Conference (2022, June 02)

See attached.

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See detailUnlocking web archives through metadata, seed lists and derived data
Clavert, Frédéric UL; Schafer, Valerie UL

Scientific Conference (2022, June 01)

This presentation addresses the use, re-use, access and dissemination of data related to web archives. Web archives (Brügger, 2018) have been for several years in a hybrid position regarding access ... [more ▼]

This presentation addresses the use, re-use, access and dissemination of data related to web archives. Web archives (Brügger, 2018) have been for several years in a hybrid position regarding access, depending on the institutions that were preserving them. While Internet Archive has made its collections available online since 2001 through the Wayback Machine (but with limited features for scholars willing to conduct a distant reading based on data, WARC files, etc.), most national libraries only allowed an onsite access due to authors rights restrictions (and in some cases the frame of legal deposits), while starting to provide interesting metadata for research projects willing to explore them. However, the situation is currently evolving in the frame of several research projects that allow to access a vast amount of (international) metadata and datasets. Taking two research projects in progress as case studies, WARCnet and AWAC2, this paper aims to present the move towards the use of metadata and derived data related to huge collections of web archives of the COVID crisis. WARCnet (Web ARChive studies network researching web domains and events) is a network whose activities (funded by the Independent Research Fund Denmark | Humanities (grant no 9055-00005B)) run in 2020-2023. The networking activities are guided by overarching research questions, one of them being “How transnational events developed on the European web?” (and notably the COVID crisis which is explored in WG2 (https://cc.au.dk/en/warcnet/working-groups)). AWAC2 (Analysing Web Archives of the COVID Crisis through the IIPC Novel Coronavirus dataset) is a project part of the Archives Unleashed Cohort Program, that supports and facilitates research engagement with web archives. It aims to explore a unique collection of web material (https://archive-it.org/collections/13529) related to the pandemic, with contributions from over 30 members of IIPC (International Internet Preservation Consortium) as well as public nominations from over 100 individuals/institutions. May it be in terms of access or tools, both projects are currently exploring new methodologies based on broad datasets (i.e. 5,3 TB for the IIPC collection related to the COVID crisis; 9.4 GB and 8,738,751 lines for the CSV related to plain text webpages). Starting with the WARCnet project, the presentation will explain how its WG2 gathered and accessed several national European datasets of COVID web archives, their specificities as well as their heterogeneity, the first analysis conducted through a datathon on January- February 2021 (Aasman et al. 2021) and the limits and assets of such access. Within the AWAC2 project (2021-2022) the access to the international IIPC COVID collection, through Archive-It and through the cohort program developed by the Archives Unleashed Team (Netpreserve, 2021; Ruest et al., 2021), is then a new opportunity to access data through mediated interfaces (ARCH) and to go further into them. Here again the presentation will demonstrate new opportunities and show a few examples of the analysis conducted by the team. Both examples aim to present the way web archiving institutions, libraries and researchers are developing new ways of accessing and exploring web archives, while also increasing their value(s) (Schafer and Winters, 2021). References Aasman, S., Bingham, N., Brügger, N., de Wild, K., Gebeil S. & Schafer V. (2021). Chicken and Egg: Reporting from a Datathon Exploring Datasets of the COVID- 19 Special Collections, WARCnet paper, Aarhus, https://cc.au.dk/fileadmin/dac/Projekter/WARCnet/Aasman_et_al_Chicken_and_Egg.pdf Brügger, N. (2018). The Archived Web. Doing History in the Digital Age. Cambridge, MA: The MIT Press. IIPC (2021), A Retrospective with the Archives Unleashed Project, netpreserve blog, https://netpreserveblog.wordpress.com/2021/04/01/a-retrospective-with-the-archives-unleashed-project/ Ruest, N., Fritz, S., Deschamps, R. Lin, J. & Milligan, I. (2021) From archive to analysis: accessing web archives at scale through a cloud-based interface. International Journal of Digital Humanities, https://paperity.org/p/260049927/from-archive-to-analysis-accessing-web-archives-at-scale-through-a-cloud-based-interface Schafer V. & Winters J. (2021). The values of web archives, International Journal of Digital Humanities, 1-10, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8190571/ [less ▲]

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See detailSignal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalability of the Layered Software Architecture
Bengtsson, Hoai Hoang; Hiller, Martin; Migge, Jörn et al

Scientific Conference (2022, June 01)

The industry is quickly moving away from a function/signal-oriented architecture towards Service-Oriented Architectures (SOA). To carry-over legacy signal-oriented ECUs during the transition phase, Volvo ... [more ▼]

The industry is quickly moving away from a function/signal-oriented architecture towards Service-Oriented Architectures (SOA). To carry-over legacy signal-oriented ECUs during the transition phase, Volvo Cars has developed a layered software (SW) architecture based on the concepts of "device proxys" (i.e., one per legacy ECU), signal real-time database and service interface. This architecture, executing on the central computer on the TSN backbone, provides a clear separation of concerns between its components with a reduced additional complexity. In this presentation, we will review the main challenges faced in the integration of signal-oriented ECUs into SOA, and present the solutions explored at Volvo with a focus on layered SW architecture in the centralized E/E architecture and its 3 core components: o Device Proxies o Signal DataBase o Service Interface We then report on the performances of this architecture in terms of latencies and conclude on the maximum number of signal-oriented frames and legacy ECUs that can be handled. The performance evaluation is conducted by simulation, with sensitivity analysis to identify the performance bottlenecks. The E/E architecture under study is a prototype TSN-based central computing architecture targeted at next-generation models. The main questions that will be discussed throughout the presentation are 1) how to efficiently handle signal to service conversion? 2) The performance and the scalability of the SW architecture proposed and 3) the suitability of SOME/IP as the SOA protocol. [less ▲]

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See detailKonzept, Methodik und Perspektiven eines digitalen historischen Stadtatlas - das Beispiel Luxemburg
Uhrmacher, Martin UL

Scientific Conference (2022, June)

The historical atlas of the city of Luxembourg has been accessible on the internet since 2019. Since then, it has been continuously expanded, revised and improved, both technically and in terms of content ... [more ▼]

The historical atlas of the city of Luxembourg has been accessible on the internet since 2019. Since then, it has been continuously expanded, revised and improved, both technically and in terms of content. Users currently have the opportunity to view a large number of historical old maps and aerial photographs from Luxembourg archives for the period between 1560 and 2017 at zoom levels of their choice and to compare them with each other on transparent layers, precisely fitting one above the other. In addition, historical photos and views as well as explanatory texts on the city's history and on selected buildings or other infrastructure elements can be displayed. In order to realise the advantages of a web publication in the best possible way, the Luxatlas is based on open source software. This enables the development of customised WebGIS applications for the specific requirements of the project.In addition to the project presentation, the presentation will also highlight the methodological and source-critical challenges and put them up for discussion. [less ▲]

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See detailFeasibility of Advanced Oxidation Processes as an upgrade for Microcontaminants removal at municipal Wastewater Treatment Plants
Salmeron Garcia, Irene UL; Nunez Tafalla, Paula UL; Venditti, Silvia UL et al

Scientific Conference (2022, June)

Benzotriazole, carbamazepine, clarithromycin and diclofenac have been identified as microcontaminants of concern in Luxembourgish wastewaters, thus the implementation of photo-Fenton processes at natural ... [more ▼]

Benzotriazole, carbamazepine, clarithromycin and diclofenac have been identified as microcontaminants of concern in Luxembourgish wastewaters, thus the implementation of photo-Fenton processes at natural pH has been proposed for their removal. In the present work, the effectiveness of a pilot scale photo-Fenton system (500W Medium Pressure) has been evaluated according to the reagent dosage and toxicity of the treated effluent. With this treatment, 80% degradation is achieved in 15 minutes even with 5 and 3 mg/L of iron (40 mg/L H2O2), but 5 mg/L can have a negative effect on the growth of Sorghum saccharatum in Phytotoxicity tests. In comparison UV-C/H2O2 (40W Low Pressure; 40 mg/L H2O2) process needs longer treatment time and generates degradation by-products causing a growth inhibition of Sorghum saccharatum. The combination of both lamps can lead to a better performance of the reagents allowing to reach the 80% target in less time and to reduce the dosage. [less ▲]

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See detailReal-Time Large Deformation Simulations Using Probabilistic Deep Learning Framework
Saurabh, Deshpande; Jakub, Lengiewicz; Stephane, Bordas

Scientific Conference (2022, June)

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See detailComparison of UVC and Solar-based Processes for the Simultaneous Removal of Microcontaminants and Microorganism from Urban Wastewater Effluents I.
Salmeron Garcia, Irene UL; Sánchez-Montes, Isaac; Ruiz-Delgado, Ana et al

Scientific Conference (2022, June)

Currently, the presence of microcontaminats (MCs) and pathogens in secondary municipal wastewater treatment plant effluents entails a challenge to be addressed before water discharge or reuse. In this ... [more ▼]

Currently, the presence of microcontaminats (MCs) and pathogens in secondary municipal wastewater treatment plant effluents entails a challenge to be addressed before water discharge or reuse. In this work UVC (UVC/S2O82-, UVC/H2O2) and solar-based processes (solar/S2O82- and solar/H2O2) are proposed as tertiary treatments for the simultaneous removal of both, MCs and pathogens, comparing their efficiency aiming to find the most suitable solution. The microorganisms studied were Escherichia coli, Enterococcus faecalis and Salmonella enteritidis in a concentration of 103 CFU mL-1 each and a mixture of 6 MCs (acetaminophen, caffeine, carbamazepine, trimethoprim, sulfamethoxazole and diclofenac) each at 100 μg L-1 of initial concentration, using simulated wastewater treatment plant effluent as water matrix. The concentrations of oxidants studied were 25 and 50 mg L-1 of each, respectively. Results revealed that UVC/H2O2 at 25 mg L-1 presented the most satisfactory solution considering treatment time and addition of reagents for complete inactivation of target pathogens and 80% removal of the sum of MCs. [less ▲]

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See detailDie zweifache Rechtfertigung des ‚Bösewichts‘: Figurationen des Bösen bei Schiller
Kohns, Oliver UL

Scientific Conference (2022, June)

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See detailAnalysis of GNSS sensed slant wet delay during severe weather events in central Europe
Hunegnaw, Addisu UL; Duman, Hüseyin; Elgered, Gunnar et al

Scientific Conference (2022, May 26)

Over the last few decades, anthropogenic greenhouse gas emissions have increased the frequency of climatological anomalies such as temperature, precipitation, and evapotranspiration. It is noticed that ... [more ▼]

Over the last few decades, anthropogenic greenhouse gas emissions have increased the frequency of climatological anomalies such as temperature, precipitation, and evapotranspiration. It is noticed that the frequency and severity of the intense precipitation signify a greater susceptibility to flash flooding. Flash flooding continues to be a major threat to European cities, with devastating mortality and considerable damage to urban infrastructure. As a result, accurate forecasting of future extreme precipitation events is critical for natural hazard mitigation. A network of ground-based GNSS receivers enables the measurement of integrated water vapour along slant pathways providing three-dimensional water vapour distributions. This study aims to demonstrate how GNSS sensing of the troposphere can be used to monitor the rapid and extreme weather events that occurred in central Europe in June 2013 and resulted in flash floods and property damage. We recovered one-way slant wet delay (SWD) by adding GNSS post-fit phase residuals, representing the troposphere's higher-order inhomogeneity. Nonetheless, noise in the GNSS phase observable caused by site-specific multipath can significantly affect the SWD from individual satellites. To overcome the problem, we employ a suitable averaging strategy for stacking post-fit phase residuals obtained from the PPP processing strategy to generate site-specific multipath corrections maps (MPS). The spatial stacking is carried out in congruent cells with an optimal resolution in elevation and azimuth at the local horizon but with decreasing azimuth resolution as the elevation angle increases. This permits an approximately equal number of observations allocated to each cell. The spatio-temporal fluctuations in the SWD as measured by GNSS closely mirrored the moisture field associated with severe weather events in central Europe, i.e., a brief rise prior to the main rain events, followed by a rapid decline once the storms passed. Furthermore, we validated the one-way SWD between ground-based water-vapour radiometry (WVR) and GNSS-derived SWD for different elevation angles. [less ▲]

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See detailA Cybersecurity Incident: Who You Gonna Call?
Schmitz, Sandra UL

Scientific Conference (2022, May 25)

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See detail“Use”: When personas become real users…
Clavert, Frédéric UL; Schafer, Valerie UL

Scientific Conference (2022, May 24)

Building upon our experience with ARCH, our study related to the IIPC Novel Coronavirus collection, as well as upon the first months of research we conducted as a cohort team in the Archives Unleashed ... [more ▼]

Building upon our experience with ARCH, our study related to the IIPC Novel Coronavirus collection, as well as upon the first months of research we conducted as a cohort team in the Archives Unleashed Project, we will provide feedback related to users’ needs and achievements. Ian Milligan distinguished in his paper “You shouldn’t Need to be a Web Historian to Use Web Archives: Lowering Barriers to Access Through Community and Infrastructure” (WARCnet paper, Aarhus, 2020), three personas: a computational humanist, a digital humanist, and a conventional historian. As an heterogeneous team, mirroring in some ways the personas distinguished by Ian Milligan, we will underline the successes and failures we experienced, the technical layers and levels we unfolded, our experience of collective work which also needs to take interdisciplinarity and heterogeneity (of technical skills, interests, availability, digital literacy) into account, the value of mentorship and our iterative process with data and research questions. We will finally shortly discuss the many pros and few cons in lowering barriers to access web archives (e.g. How to make access easiest without hiding the complexity of web archives?). [less ▲]

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See detailLes archives du Web, des sources aux données
Schafer, Valerie UL

Scientific Conference (2022, May 20)

This keynote during Humanistica 2022 aimed to retrace 15 years of evolution of web archiving and web archives' studies. It also presented some research projects like the current Hivi, WARCnet and AWAC2 ... [more ▼]

This keynote during Humanistica 2022 aimed to retrace 15 years of evolution of web archiving and web archives' studies. It also presented some research projects like the current Hivi, WARCnet and AWAC2 projects. [less ▲]

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See detailL'émission de radio "100 Jahre Ostbelgien"
Brüll, Christoph UL; Fickers, Andreas UL

Scientific Conference (2022, May 20)

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See detailDie unfreien Befreiten. Über die lange Heimkehr der sowjetischen ZwangsarbeiterInnen aus Luxemburg.
Ganschow, Inna UL

Scientific Conference (2022, May 17)

Inna Ganschow untersucht in ihrem Vortrag die verschiedenen Typen totaler Institutionen im Sinne Erving Goffmans auf dem Weg von ZwangsarbeiterInnen aus der Sowjetunion nach Luxemburg und zurück. Von den ... [more ▼]

Inna Ganschow untersucht in ihrem Vortrag die verschiedenen Typen totaler Institutionen im Sinne Erving Goffmans auf dem Weg von ZwangsarbeiterInnen aus der Sowjetunion nach Luxemburg und zurück. Von den nationalsozialistischen Durchgangs- und Kriegsgefangenenlagern über die luxemburgischen Werk- und Ostarbeiterlager bis hin zu den sowjetischen Sammel- und Filterlagern endete die lange Reise nach Hause oft nach einigen Monaten oder Jahren erneut in einem Lager oder einer Zwangsansiedlung. Die Repatriierung junger ukrainischer, weißrussischer und russischer Frauen wird anhand von erhaltenen Dokumenten aus erster Hand, verschiedenen Lager- und Betriebsunterlagen sowie Augenzeugenberichten rekonstruiert. Die Rückführung wird im Hinblick auf ihre Funktion analysiert, die eine Bestrafung, eine Belohnung oder ein Schutz sein konnte. [less ▲]

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See detailLuxembourg – navigating the transition to the knowledge economy. A historical perspective
Danescu, Elena UL

Scientific Conference (2022, May 13)

Luxembourg is a multicultural, multilingual and cross-border area par excellence that has always sought to maintain an openness to its neighbours, both for reasons of security and to give itself access to ... [more ▼]

Luxembourg is a multicultural, multilingual and cross-border area par excellence that has always sought to maintain an openness to its neighbours, both for reasons of security and to give itself access to larger markets. Despite its small geographical area, limited workforce and lack of natural resources, Luxembourg is currently first out of 196 countries worldwide in terms of GDP/capita (with 114 370 €/capita, representing 260% of the EU average).Thanks to a long-term strategic vision, political and institutional innovation and structural changes implemented in economy throughout the 20th century, the once bipolar agricultural/industrial society has become a competitive society based largely on knowledge-intensive services and centred on the financial sector, characterised by high-performing human capital, political stability, prosperity and a strong welfare system.Taking this observation as a starting point, adopting a comparative and interdisciplinary perspective and drawing on a wide range of European and international archive and institutional sources, the paper sets out to address the following research questions: what are the factors of change and the major challenges facing Luxembourg in the digital transition? What institutions and governance is it using to tackle these challenges? What are the risks, benefits and opportunities of this transformation over the long term? What are the country’s strengths in terms of competitiveness, and what are the weaknesses that might jeopardise its comparative advantages? What is the impact of digitalisation on the public sector and on the government’s links with business and the public at large? [less ▲]

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See detailThe NIS 2.0 Directive - Lessons learnt or lagging behind? A legal perspective
Schmitz, Sandra UL

Scientific Conference (2022, May 10)

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See detailTable ronde : Quel avenir pour la Revue Belge d'Histoire contemporaine ?
Auwers, Michael; Dubois, Sébastien; Tyssens et al

Scientific Conference (2022, May 09)

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See detailScanning the Past: A 3D Model of Trausch's Library
Teferle, Felix Norman UL; Wieneke, Lars UL; Parvaz, Shahoriar UL et al

Scientific Conference (2022, May 05)

Today, modern geospatial technologies and methods are widely used in combination with the documentation and preservation of objects of importance to cultural heritage. In this setting, archeologists and ... [more ▼]

Today, modern geospatial technologies and methods are widely used in combination with the documentation and preservation of objects of importance to cultural heritage. In this setting, archeologists and historians alike benefit from the rapid technological developments over the past decades, which have resulted in instrumentation that allows the capture of real objects and the generation of accurate and precise three-dimensional (3D) digital representations, i.e. models, from these sensed data. Here, the object of interest is the villa of the late historian Professor Gilbert Trausch with its library, for which a virtual library should be created for the general public. The building is an 19th century townhouse located on Limpertsberg in the City of Luxembourg and contains a cellar, three floors as well as a loft. Of particular interest were the cellar, stair cases, the first (the location of Professor Trausch’s office) and second floors as most of the bookshelves are situated there. In line with state-of-the-art approaches for 3D building modelling, a broad spectrum of modern geospatial technologies including classical surveying, Global Navigation Satellite System (GNSS), digital close-range photogrammetry and terrestrial laser scanning were employed to capture the Villa Trausch and its 33 bookshelves, i.e. Trausch’s Library, in all its details, while providing all data in one homogeneous coordinate system. Models and more photo-realistic visualizations of the exterior and interior have been obtained using, e.g., indoor images captured during the scanning. These allowed us to explore different virtual reality (VR) pathways employed by the gaming industry, for the generation of a first VR experience of the building in the sense of a digital museum. Currently solutions for the development of a public virtual library using commercial providers are investigated. [less ▲]

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See detailSpatio-Temporal Rainfall Estimation from Communication Satellite Data using Graph Neural Networks
Krebs, Julian UL; Mishra, Kumar Vijay; Gharanjik, Ahmad et al

Scientific Conference (2022, May)

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See detailThe Luxembourg Financial Ecosystem and the European Monetary Innovation. Cas Study on KBL, LuxSE and EIB (1957-1990)
Danescu, Elena UL; Cheng, Anqi

Scientific Conference (2022, April 26)

The Luxembourg international financial centre developed considerably during the 1960s, propelled by several factors including concerted government policy, flexible regulation and a willingness to harness ... [more ▼]

The Luxembourg international financial centre developed considerably during the 1960s, propelled by several factors including concerted government policy, flexible regulation and a willingness to harness opportunities at international level (such as the 1963 US interest equalisation tax and the Bundesbank provisions introduced in 1968 and 1974). The decision to establish various Community institutions (the ECSC High Authority in 1952) and European funding institutions (the European Investment Bank in 1968) in the country also had a decisive impact. The currency union with Belgium (BLEU, 1921) and the absence of a Luxembourg Central Bank made these developments all the more significant. Drawing on archives and oral history sources, this paper aims to illustrate the complexity and originality that characterised the development of the conceptual, political and regulatory context in Luxembourg in the 1960s-1990s, in what can be seen as a sui generis experiment and preparation for EMU. It will explore the changing financial ecosystem in Luxembourg and the collaborative efforts by its main stakeholders (banks, regulatory authorities, individuals, networks) - with a focus on KBL, LuxSE and EIB - to encourage financial and monetary innovation (via the EUA, ECU, and Eurco) before the introduction of the European single currency and to pave the way for the establishment and consolidation of the euro [less ▲]

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See detailRKHS Based State Estimator for Radar Sensor in Indoor Application
Kumar Singh, Uday UL; Shankar, Bhavani; Alaee, Mohammad

Scientific Conference (2022, April 23)

For the estimation of targets’ states (location, velocity, and acceleration) from nonlinear radar measurements, usually, the improved version of well known Kalman filter: extended Kalman filter (EKF) and ... [more ▼]

For the estimation of targets’ states (location, velocity, and acceleration) from nonlinear radar measurements, usually, the improved version of well known Kalman filter: extended Kalman filter (EKF) and unscented Kalman filter (UKF) are used. However, EKF and UKF approximates the nonlinear measurement function either by Jacobian or using sigma points. Consequently, because of the approximation of the measurement function, the EKF and UKF cannot achieve high estimation accuracy. The potential solution is to replace the approximation of nonlinear measurement function with its estimate, obtained in high dimensional reproducing kernel Hilbert space (RKHS). An ample amount of research has been done in this direction, and the combined filter is termed RKHS based Kalman filter. However, there is a shortage of literature dealing with estimating the dynamic state of the target in an indoor environment using RKHS based Kalman filter. Therefore, in this paper, we propose the use of RKHS based Kalman filter for indoor application. Specifically, we validate the suitability of the RKHS based Kalman filtering approach using simulations performed over three different target motion models. [less ▲]

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See detailThe positional value of education in the Americas: dynamics of inequality in labour market returns for highly unequal countries, 2000-2019
Ceron, Francisco UL; Chauvel, Louis UL

Scientific Conference (2022, April 22)

The article examines how the labour market value of education has changed in the context of the expansion of higher education. However, one drawback is understanding how it generates differences between ... [more ▼]

The article examines how the labour market value of education has changed in the context of the expansion of higher education. However, one drawback is understanding how it generates differences between high and low-skilled labour markets, particularly in contexts of high inequality and informality. This could be linked to specific mechanisms by which employers value educational credentials as signalled skills. Using the Luxembourg Income Study (LIS), we analyse trends over two decades in 11 American countries. Our results confirm the previous results for the claim that education has become increasingly positional, compared with the absolute model of education. However, we find that the relative gains in wages for workers with higher levels of education, as the pool of higher education graduates expand over time, increased only slightly in high-skilled occupations, while their relative gains decreased for lower-skilled occupations. This trend is present in both absolute and positional models of education. Moreover, when looking at the structure of labour markets in terms of the linkage between educational credentials and occupational groups, we higher the tertiary education specificity of occupations, the higher the earnings for workers with advantaged positions. These findings are consistent with processes of displacement of low-skilled workers due to increasing competition among highly educated workers, from the positional model of education. [less ▲]

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See detailAcademic Profile Development: An Investigation of Differentiation Processes Based on Students' Achievement and Grade Level
Breit, Moritz; Brunner, Martin; Fischbach, Antoine UL et al

Scientific Conference (2022, April 21)

Academic achievement profiles affect students’ further development, i.e., by informing educational and professional choices. However, there is a lack of knowledge on the mechanisms behind the development ... [more ▼]

Academic achievement profiles affect students’ further development, i.e., by informing educational and professional choices. However, there is a lack of knowledge on the mechanisms behind the development of academic profiles. For research on cognitive ability profiles, specifically differentiation processes, statistical tools have been developed. In the present article, we transfer these methods for differentiation research to academic achievement data. We examine differentiation depending on students’ general level of achievement and grade level in a large Luxembourgish student sample. Students’ achievements in German, French, and Math were assessed within the Luxembourg school monitoring program. We found more balanced academic profiles with increasing achievement level. We further found more balanced profiles with increasing grade level and a positive interaction effect. [less ▲]

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See detailA new R package for Finite Mixture Models with an application to pension systems
Schiltz, Jang UL; Noel, Cédric

Scientific Conference (2022, April 20)

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See detailTranslanguaging pedagogy and creative activism for preschool teachers, parents, and children
Aleksic, Gabrijela UL

Scientific Conference (2022, April 18)

Today’s education is impacted by the fast changes that can be very challenging for teachers, parents, and students. The need of pedagogies that will support them to navigate through these changes and ... [more ▼]

Today’s education is impacted by the fast changes that can be very challenging for teachers, parents, and students. The need of pedagogies that will support them to navigate through these changes and challenges, becomes evident, especially in highly linguistically and culturally diverse countries such as the small trilingual Grand-Duchy of Luxembourg. One of such pedagogies is translanguaging pedagogy. While translanguaging refers to the natural use of entire linguistic repertoire of bi/multilingual people, translanguaging pedagogy helps teachers to use bi/multilingual students’ unique linguistic repertoires to foster learning, comprehension, and academic achievement (Otheguy, García, & Reid, 2015). In Luxembourg, there are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). Therefore, in 2017, multilingual early education has become mandatory obliging teachers to help students to develop Luxembourgish, familiarize them with French, and value their home languages. Thus, in order to support teachers’ work, there were three objectives of the present project : (1) to administer an 18-hours professional development (PD) course in translanguaging pedagogy to 40 preschool teachers, (2) to actively include students’ families in order to straighten home-school collaboration, and (3) to support children’s linguistic, socio-emotional, and cognitive development and engagement in the classroom. The PD course was divided into seven sessions on multilingual ecology, home-school collaboration, multilingual brain, and multilingual oracy and literacy, over 6 months. To evaluate the success of these aims, before and after the course, we employed teacher questionnaires, focus groups, and interviews with the teachers, parent questionnaires and interviews with the parents, and early literacy and numeracy tests in the school and home languages as well as video observations of classroom interactions with the students. Regarding the teachers, the results from the teacher questionnaire before and after the course, showed that there was a significant positive change in attitudes towards children’s multilingualism and their home languages. However, in the focus groups and the interviews, we identified that most of the teachers were open to the use children’s home languages only to develop the school language, Luxembourgish. In the analysis of the video observations of teacher/child interactions, we observed that when the home language of children was used, this immediately contributed to their well-being. However, we also observed that in some classrooms the use of children’s home languages was artificial; the teachers insisted on naming home languages instead of giving the children the opportunity to use the school language and be proud of it. Regarding the parents, the analysis of 65 questionnaires on children’s home literacy environment and the interviews showed that parental involvement is crucial for children’s linguistic and socio-emotional development. The interviewed parents shared that they would like to be more involved in the home-school collaboration but they did not know how. Although they were open for more collaboration, most of the parents thought that this should be initiated from the teachers. Finally, regarding the children, we observed the linguistic and socio-emotional development of 23 children (age 4) over one year. The children were tested in early literacy and numeracy, three times over the course of one year. When plotting the results, we identified that all children performed better in their home languages than in the school language and that there was a progress in both home and school language over one year. Furthermore, the video observations showed that when translanguaging pedagogy was used and children’s home languages were valued, children were more responsive and eager to learn and interact with others. Following these results and in order to connect teachers, parents, and children, I developed a website for teachers with the summary of important theories in multilingualism supported by many practical activities in the domain of multilingual classroom, home-school collaboration, and multilingual oracy and literacy. The website is in English, French, and German, and teachers can find a solid support for their work. Furthermore, I wrote two illustrated books for parents and children. In the illustrated book for parents the main character is a woman called Sumak who moved from another country as a refugee and is forced to learn a new language in a society she does not fit in. A storytelling workshop will allow teachers and parents to share their experience and connect on a deeper level. In the book for children, the main character is a girl called Mara who moved to a new country and does not understand the school language. She is sad and angry and tries to find solutions, for example, in music. The book contains a CD with in which the character Mara sings the song in Mara’s language, allowing teachers and children to hear that it is ok to speak in a language they do not understand. The illustrated books exist in English, French, Serbian, Portuguese, and German. These creations are an act of creative activism, which are “transformative interventions in order to change society for the better by communicating conflicts and/or solutions where no one else can or will in order to provoke reflection (and consequent behavioral changes)” (Harrebye, 2016, p. 25). Finally, this is an act of going beyond the horizons and the project results, and reimagining everything, especially playing with new ideas and applying those through specific creative acts that bring teachers, parents, and children together. The Conference will allow me to showcase these creative interventions, discuss their impact on the schools, and offer them to international researchers who work in education and beyond. References Ministry of National Education, Childhood and Youth [MENJE]. (2018). Les chiffres clés de l'Éducation nationale: statistiques et indicateurs - Année scolaire 2016-2017 [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 Harrebye S.F. (2016) Creative activism today. In: Social change and creative activism in the 21st century. London: Palgrave Macmillan. Otheguy, R., García, O., & Reid, W. (2015). Clarifying translanguaging and deconstructing named langauges: A perspective from linguistics. Applied Linguistic Review, 6(3), 281–307. [less ▲]

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See detailD-ViNE: Dynamic Virtual Network Embedding in Non-Terrestrial Networks
Maity, Ilora UL; Vu, Thang Xuan UL; Chatzinotas, Symeon UL et al

Scientific Conference (2022, April 10)

In this paper, we address the virtual network embedding (VNE) problem in non-terrestrial networks (NTNs) enabling dynamic changes in the virtual network function (VNF) deployment to maximize the service ... [more ▼]

In this paper, we address the virtual network embedding (VNE) problem in non-terrestrial networks (NTNs) enabling dynamic changes in the virtual network function (VNF) deployment to maximize the service acceptance rate and service revenue. NTNs such as satellite networks involve highly dynamic topology and limited resources in terms of rate and power. VNE in NTNs is a challenge because a static strategy under-performs when new service requests arrive or the network topology changes unexpectedly due to failures or other events. Existing solutions do not consider the power constraint of satellites and rate limitation of inter-satellite links (ISLs) which are essential parameters for dynamic adjustment of existing VNE strategy in NTNs. In this work, we propose a dynamic VNE algorithm that selects a suitable VNE strategy for new and existing services considering the time-varying network topology. The proposed scheme, D-ViNE, increases the service acceptance ratio by 8.51% compared to the benchmark scheme TS-MAPSCH. [less ▲]

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See detailMusique à vent pendant l'occupation nazie au Luxembourg de 1940 à 1944
Sagrillo, Damien François UL

Scientific Conference (2022, April 09)

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See detailThe Instrumental Turn of Nationality: An Investment Law Perspective
Garcia Olmedo, Javier UL

Scientific Conference (2022, April 08)

This workshop takes a holistic approach to examine the role and future of nationality in a globalised world, taking citizenship by investment (CBI) schemes as a point of departure. It explores the ... [more ▼]

This workshop takes a holistic approach to examine the role and future of nationality in a globalised world, taking citizenship by investment (CBI) schemes as a point of departure. It explores the implications and impacts of CBI schemes, followed by a discussion on the instrumental turn of nationality in different areas, including EU law, private international law, human rights law, immigration law, diplomatic protection and international investment law. [less ▲]

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See detailThe History of Cross-Border Cooperation: some historiographical remarks
Brüll, Christoph UL

Scientific Conference (2022, March 24)

What is Cross-Border Cooperation? How to write the History of Cross-Border Cooperation? The contribution explores the historiography in the field and presents two case studies (Euregio Meuse-Rhine and ... [more ▼]

What is Cross-Border Cooperation? How to write the History of Cross-Border Cooperation? The contribution explores the historiography in the field and presents two case studies (Euregio Meuse-Rhine and Europäische Vereinigung Eifel-Ardennen). It focusses on the sources that could be used for such a history and on difficulties regarding archival research. [less ▲]

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See detailSeeking A Balanced Investment Protocol in the African Continental Free Trade Area (AfCTA)
Garcia Olmedo, Javier UL

Scientific Conference (2022, March 21)

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See detailLa relecture entre pairs : un levier de motivation de la pratique de l’écrit
Lejot, Eve UL

Scientific Conference (2022, March 17)

Les enseignants corrigent et donnent des conseils d’amélioration à leurs apprenants, mais les commentaires des enseignants sont parfois mal compris (Cole, Coats, Lentell 1986 ; Smith 1997), alors que la ... [more ▼]

Les enseignants corrigent et donnent des conseils d’amélioration à leurs apprenants, mais les commentaires des enseignants sont parfois mal compris (Cole, Coats, Lentell 1986 ; Smith 1997), alors que la relecture entre pairs apporte un échange avec moins de pression (Lejot 2017). Cet échange se fait à un niveau de hiérarchie égal et facilite la négociation de sens des éléments du texte. Néanmoins, certains élèves pointent le manque de qualification des pairs pour remplacer les commentaires des professeurs dans l’enseignement supérieur (Rollinson 2005). Cette démarche trouve toute sa force pour les doctorants. Mis en place sur un semestre, ce système fermé de relecture et de commentaires reçus en boucle est bénéfique et motivant pour ces derniers. Dans les ateliers interdisciplinaires sur les compétences transversales et en l'occurrence celle de l'écrit académique, les doctorants soulignent l’énergie, la réflexion commune et le soutien que leur a apporté la relecture de texte d'un pair et d'être eux-mêmes relus (Lejot 2017). Relire est formateur et être compris par des chercheurs pairs fait faire un grand pas en termes de cohérence d'écriture et d'argumentation bien articulée à ces groupes des écoles doctorales. [less ▲]

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See detailThe Digital Archive and the Politics of Digitisation
Zaagsma, Gerben UL

Scientific Conference (2022, March 10)

In this paper I will discuss key parameters of the politics of digitisation within a broader historical and global context with the aim to encourage further debate on its implications for historical ... [more ▼]

In this paper I will discuss key parameters of the politics of digitisation within a broader historical and global context with the aim to encourage further debate on its implications for historical research. In the first part, I will outline the global dimensions of the politics of digital cultural heritage with a particular focus on developments within and between Europe and Africa, framed within the broader context of the politics of heritage and its preservation and recent debates about ‘postcolonial digital humanities’. In the second part, I will discuss the history and current state of digitisation in Europe and Africa. Here I will partly draw upon the web archive of the IFLA/Unesco Directory of Digitised Library Collections (2002-2006) and recent global and European digitisation surveys. The paper will conclude by highlighting the paradoxical situation we currently face with regard to digitisation and the state of ‘memory’ in both the global North and South. [less ▲]

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See detailDie Bedeutung der Schule für Gesundheit und Wohlbe- finden von Schülerinnen und Schülern: Ergebnisse der HBSC Surveys 2018 in Luxemburg
van Duin, Claire UL; Heinz, Andreas UL; Willems, Helmut Erich UL

Scientific Conference (2022, March 10)

Neben der Familie ist die Schule für Kinder und Jugendliche ein wichtiges Umfeld. Hier verbringen sie einen großen Teil des Tages, hier treffen sie ihre Freunde, und ihre schulischen Leistungen bestimmen ... [more ▼]

Neben der Familie ist die Schule für Kinder und Jugendliche ein wichtiges Umfeld. Hier verbringen sie einen großen Teil des Tages, hier treffen sie ihre Freunde, und ihre schulischen Leistungen bestimmen wesentlich mit, welchen beruflichen Weg sie später einschlagen können. Dementsprechend hat die Schule als sozialer Kontext einen großen Einfluss auch auf das Wohlbefinden und gesundheitliche Befindlichkeiten der Schüler. Positive schulische Erfahrungen können eine Ressource für Wohlbefinden sein, negative Erfahrungen können die psychische und physische Gesundheit beeinträchtigen. Da es sich bei HBSC um eine Befragung handelt, die in der Schule durchgeführt wird und da die Schule ein wichtiges soziales Umfeld ist, werden auch mehrere Fragen zur Schule gestellt. Im Vortrag werden zunächst aktuelle Ergebnisse aus Luxemburg zum schulischen Kontext präsentiert und international eingeordnet. So wird schon seit mehreren Befragungen erhoben, ob die Schüler die Schule mögen, ob sie sich durch die Schularbeit gestresst fühlen und wie sie die Beziehungen zu ihren Klassenkameraden und den Lehrern bewerten und ob sie viel auf der Ebene der Klasse und der Schule mitbestimmen können. In einem zweiten Schritt wird mit Hilfe einer Clusteranalyse untersucht, ob es typische Konstellationen gibt, d. h. Gruppen von Schülern, die sich in ihren Schulerfahrungen möglichst stark ähneln. Aus der HBSC-Studie ist bekannt, dass es zahlreiche Zusammenhänge zwischen diesen Erfahrungen gibt. Wenn solche kohärenten Gruppen identifiziert werden können, dann kann eine darauf basierende Typologie helfen, die komplexen Zusammenhänge zwischen zahlreichen Variablen in komprimierter Form darzustellen. Im konkreten Fall wurden 4 schulbezogene Einstellungen und Bewertungen dazu genutzt, um solche Gruppen zu identifizieren. Diese Gruppen/Cluster werden zunächst anhand der Variablen beschrieben, die zur Gruppenbildung genutzt wurden. Die Analyse zeigt, dass es bezüglich der Schulerfahrungen fünf in sich homogene Cluster gibt. Cluster 1, in dem sich der größte Anteil der Schüler (28.8%) befindet, ist durch allgemein positive Schulerfahrungen gekennzeichnet. Die Schüler in dieser Gruppe mögen die Schule, sie berichten von einem guten Klassenklima und sie geben an, kaum durch die Schularbeit gestresst zu sein. Darüber hinaus berichten diese Schüler über ein gutes Verhältnis zu ihren Lehrern. Cluster 2 ist durch Schüler gekennzeichnet, deren Schulerfahrungen überwiegend positiv sind (sie mögen die Schule und sie haben ein gutes Verhältnis zu den Mitschülern und Lehrern), die sich aber durch die Schularbeit gestresst fühlen, was sich negativ auf ihr allgemeines Wohlbefinden auswirkt. Cluster 3 zeichnet sich durch Schüler aus, die über ein geringes Maß an Stress berichten und insgesamt durchschnittliche Werte für die schulbezogenen Variablen wie Beziehungen zu ihrem Lehrer und das Klassenklima aufweisen. In Cluster 4 befinden sich die Schüler, die viel Schulstress erfahren, relativ schlechte Beziehungen zu ihren Lehrern haben und die Schule im Allgemeinen nicht mögen. Allerdings berichten diese Schüler von einem guten Klassenklima. Dieses Cluster umfasst 14.7% der Schüler und ist damit das kleinste Cluster. Cluster 5 besteht aus Schülern mit durchweg negativen Schulerfahrungen und ist damit das Gegenteil von Cluster 1. Die Schüler in Cluster 5 haben viel Schulstress, sind nicht gerne in der Schule und berichten von schlechteren Beziehungen zu ihren Lehrern und Mitschülern im Vergleich zu den Schülern in den anderen Clustern. Die weitere Beschreibung der Cluster mit Hilfe von soziodemografischen Variablen, anderen schulbezogenen Variablen und gesundheitsbezogenen Ergebnisvariablen wird zeigen, dass die gefundenen Gruppen in sich kohärent sind bezüglich der schulbezogenen Variablen, und dass sie zudem mit gesundheitsbezogenen und mit soziodemografischen Variablen korrelieren. [less ▲]

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See detailStereotypbasierte Erwartungen und Lehrer*innenverhalten: Auswirkungen eines diagnostischen Etiketts auf die Klassenführung und die Beziehung zwischen Lehrperson und Schüler*innen.
Glock, Sabine UL; Pit-Ten Cate, Ineke UL

Scientific Conference (2022, March 09)

Theoretischer Hintergrund Neben der allgemeinen und domänenspezifischen Kompetenz von Lehrkräften bestimmen die Klassenführung und die Beziehung zwischen Lehrpersonen und Schüler*innen den Lernerfolg der ... [more ▼]

Theoretischer Hintergrund Neben der allgemeinen und domänenspezifischen Kompetenz von Lehrkräften bestimmen die Klassenführung und die Beziehung zwischen Lehrpersonen und Schüler*innen den Lernerfolg der Schüler*innen (Korpershoek et al., 2016). Die Klassenführung umfasst Strategien, die durchgeführt werden, um Ordnung zu schaffen (Doyle, 2006) und die aktive Arbeitszeit zu maximieren (Ophardt & Thiel, 2013), wobei eine Kombination von präventiven und intervenierenden Strategien zu einer effektiven Klassenführung beitragen (Little & Akin-Little, 2008). Das Modell des zwischenmenschlichen Lehrer*innenverhaltens (Wubbels et al., 2006) klassifiziert das Verhalten von Lehrkräften in die zwei Dimensionen Einfluss und Nähe, wobei eine Kombination aus autoritärem und tolerantem Verhalten als optimal angesehen wird (Wubbels & Brekelmans, 2005). Eine effektive Klassenführung und das Verständnis der Lehrkräfte für Faktoren im Zusammenhang mit dem Externalisierungs- und Internalisierungsverhalten von Schüler*innen können im Hinblick auf die Umsetzung inklusiver Bildung besonders relevant sein. Die von Lehrer*innen gewählten Strategien können jedoch durch ihre Überzeugungen und Erwartungen an bestimmte Gruppen von Schüler*innen beeinflusst werden (Bibou-Nakou et al., 2000), die mit Stereotypen in Verbindung stehen. Diese Stereotype können durch Etikettierungen aktiviert werden, beispielsweise durch eine Diagnose von sonderpädagogischem Förderbedarf (Hornstra et al., 2010). Solche Diagnosen können die Erwartungen beeinflussen und zu erhöhter Akzeptanz und Toleranz führen, und Lehrer*innen wenden oft unterschiedliche Standards und Strategien an, um auf diese Schüler*innen zu reagieren und sie zu unterstützen (Andreou & Rapti, 2010; Georgiou et al., 2002). Fragestellung Die Studie zielte darauf ab, die Klassenführung und das zwischenmenschliche Lehrer*innenverhalten als Funktion des Schülerverhaltens und einer klinischen Diagnose zu untersuchen. Wir erwarteten erstens, dass die Lehramtsstudierende bei der Konfrontation mit externalisierendem Verhalten im Vergleich zu internalisierendem Verhalten eine strengere Klassenführung und negativeres zwischenmenschliches Verhalten zeigen und zweitens, dass die Lehramtsstudierenden ihre Strategien in Abhängigkeit von einer Diagnose des sonderpädagogischen Förderbedarfs anpassen. Methode An der Studie haben 254 Lehramtsstudierende (143 weiblich) teilgenommen. Die Teilnehmer*innen wurden gebeten, anhand von Schülervignetten eine Bewertung bezüglich einer passenden Klassenführung (Neuenschwander et al., 2003) und eines angemessenen zwischenmenschlichen Lehrer*innenverhaltens abzugeben (Fisher et al., 1995; Wubbels et al., 2006). Die Schülervignetten beschrieben zwei unterschiedliche Schüler mit externalisierende oder internalisierende Verhaltensauffälligkeiten (s.a. Glock, 2016; Glock & Kleen, 2017). Um den Einfluss der Diagnose auf die Antworten der Teilnehmer*innen zu untersuchen, variierten wir systematisch das Vorliegen einer klinischen Diagnose. Daher folgte die Studie einem 2 (Diagnose: ja/nein) x 2 (Verhalten: internalisierend/externalisierend) Zwischensubjekt Design. Ergebnisse und ihre Bedeutung Die Daten zur Klassenführung wurden mit einer 2x2 MANOVA ausgewertet. Die Ergebnisse zeigten signifikanten Haupteffekte für Schülerverhalten und Diagnose, das heißt die angegebenen Klassenführungsstrategien variierten in Abhängigkeit des Schülerverhaltens (externalisierend vs. internalisierend) und Diagnose (ja/nein). Auch der Interaktionseffekt Verhalten x Diagnose war signifikant. Die Ergebnisse zusätzlicher ANOVAs zeigten, dass Lehramtsstudierende als Antwort auf Schüler mit externalisierenden Verhalten strengere Kontrolle (Regeln setzen) und mehr Flexibilität anwenden als auf internalisierendes Verhalten, vor allem wenn die Schüler mit internalisierenden Verhalten eine Diagnose sonderpädagogischen Förderbedarfs haben. Die Angaben zu dem zwischenmenschlichen Verhalten wurden mit einer 2x2 MANOVA analysiert. Auch hier waren die beiden Haupteffekte (Schülerverhalten und Diagnose) und der Interaktionseffekt (Verhalten x Diagnose) signifikant. Zusätzliche ANOVAs zeigten, dass Lehramtsstudierende im Allgemeinen autoritative zwischenmenschliche Verhaltensmuster bevorzugen, die durch Kooperation und eine gewisse Dominanz charakterisiert werden. Insgesamt zeigen die Befunde, dass Lehramtsstudiere ihre Klassenführung und zwischenmenschliches Verhalten an das Schülerverhalten und an eine klinische Diagnose anpassen. Die Lehramtsstudierenden passten ihre Strategien an, wenn Schüler eine klinische Diagnose erhielten, und wurden toleranter und unterstützender für Schüler mit internalisierendem Verhalten, während sie vor allem strengere Kontrolle und Strategien zur Begrenzung störenden (externalisierenden) Schülerverhalten anwendeten, unabhängig von einer Diagnose. Diese Befunde können teilweise auf bestehende Überzeugungen und Erwartungen hinweisen, insbesondere da die Lehramtsstudierende weniger bereit sind, externalisierendes Verhalten zu tolerieren. [less ▲]

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See detailSubjektives Wohlbefinden in der 5. und 9. Schulklasse: gibt es einen Zusammenhang mit dem Bildungsweg und der schulischen Leistung?
Pit-Ten Cate, Ineke UL; Esch, Pascale UL; Keller, Ulrich UL et al

Scientific Conference (2022, March 09)

Der Bildungsauftrag unserer heutigen Wissensgesellschaft vereint ein vielseitiges Spektrum an Kompetenzen, die den Schüler*innen vermittelt werden sollen. Die Lernziele beinhalten nicht nur akademischen ... [more ▼]

Der Bildungsauftrag unserer heutigen Wissensgesellschaft vereint ein vielseitiges Spektrum an Kompetenzen, die den Schüler*innen vermittelt werden sollen. Die Lernziele beinhalten nicht nur akademischen Erfolg, sondern auch schulisches Wohlbefinden. In der Bildungsforschung haben affektive und sozio-emotionale Faktoren sowie deren Einfluss auf das Erreichen von Lernzielen über die letzten Jahrzehnte an Interesse gewonnen (s.a. Hascher et al., 2018). Subjektives Wohlbefinden (SWB) ist ein komplexes, multidimensionales Phänomen, welches emotionale, soziale und kognitive Facetten umfasst (Hascher & Edlinger, 2009). Das SWB wird als Grundlage für erfolgreiches Lernen betrachtet (Hascher & Hagenauer, 2011), wobei der Zusammenhang je nach Entwicklungsstadium der Schüler*innen variieren kann. Ergebnisse einer Metaanalyse (Bücker et al., 2018) zeigten eine statistisch signifikante mittlere Effektstärke für den Zusammenhang zwischen SWB und Leistung, wobei diese Ergebnisse über verschiedene Ebenen soziodemografischer Merkmale, SWB-Domäne und Indikatoren der Leistung hinweg stabil waren. Außerdem zeigten Gutman und Voraus (2012) in einer längsschnittlichen Studie mit einer Kohorte von Schüler*innen zwischen 7 und 13 Jahren, schwache bis mittlere Korrelationen zwischen unterschiedlichen Dimensionen des Wohlbefindens und aktueller sowie späterer akademischer Leistung. In dieser Studie haben wir den Zusammenhang zwischen verschiedenen Dimensionen des SWB und standardisierten Kompetenztestergebnissen zu verschiedenen Zeitpunkten (5. und 9. Schulkasse) untersucht. Ein erstes Ziel bestand darin, die Unterschiede des Wohlbefindens in Bezug auf das Entwicklungsstadium zu untersuchen, wobei wir auch den Einfluss von Klassenwiederholung und Schulzweig betrachteten. Ein weiteres Ziel der Studie bestand darin, den Zusammenhang zwischen SWB und Leistung unter Berücksichtigung sozio-demografischer Variablen zu ermitteln. Die Ergebnisse basieren auf den Daten der gesamte Kohorte von Fünft- und Neuntklässler*innen (N=5159 bzw. N=6279), die im Rahmen des nationalen Schulmonitoring (Luxembourg School Monitoring Programm „Épreuves Standardisées“; Martin et al., 2015) im November 2018 in Luxemburg erhoben wurden. Im Rahmen dieser Erhebung wurden sowohl standardisierte Schulleistungstests als auch ein Fragebogen zu soziodemographischen und sozio-emotionalen Aspekten durchgeführt. Vier Domäne des SWB wurden erfasst: Selbstkonzept, Schulangst, soziale- sowie emotionale Inklusion. Die standardisierten Leistungstests umfassten Leseverstehen in Deutsch und Französisch sowie Mathematik. Zusätzlich wurden über einen Schüler- oder Elternfragebogen weitere sozio-demographische Merkmale erfasst. Der Zusammenhang zwischen SWB und Entwicklungsstadium (Schulklasse) unter Einbeziehung von Klassenwiederholung und Schulzweig wurde mittels zwei mixed model Analysen überprüft. Die Ergebnisse zeigten, dass Schüler*innen in der 5. Klasse höhere Werte von SWB angaben als Schüler*innen in der 9. Klasse, F(8,121164)=180.61, p<.001. Zusätzlich wurde das SWB negativ beeinflusst durch Klassenwiederholung, F(8, 63989)=17.75, p<.001. Neuntklässler*innen in anspruchsvolleren Schulzweigen gaben höhere Werte von SWB an als Schüler*innen in niedrigeren Schulzweigen, F(2,40219)=15.71, p<001. Die Schulleistung wurde über eine schrittweise Regression vorhergesagt: zunächst wurden sozio-demographische Hintergrundvariable (Geschlecht, Migrationshintergrund, HISEI der Eltern) dem Model hinzugefügt und, in einem zweiten Schritt, Indikatoren des SWB. Die Ergebnisse zeigten, dass in der 5. Klasse 13% und in der 9. Klasse 19% der Varianz in der Schulleistung durch soziodemografische Variablen vorausgesagt werden kann. Sowohl für Fünft- als auch für Neuntklässler*innen, erklärten die Dimensionen des SWB zusätzliche 6% bzw. 4% der Varianz. Die Ergebnisse dieser Studie zeigten, dass Entwicklungsstadium, Klassenwiederholung und Schulzweig einen Einfluß auf das SWB der Schüler*innen haben. Darüber hinaus zeigten die Ergebnisse, dass das SWB über soziodemografische Merkmale hinaus zur Erklärung der schulischen Leistung beiträgt. In Anbetracht ihrer Ergebnisse, kann diese Studie auch die Diskussion um Klassenwiederholung als pädagogische Intervention und um die Praxis der Aufgliederung von Schüler*innen nach Leistungsniveau innerhalb und zwischen Schulformen bereichern. Während sich die meisten Studien zu den Effekten dieser Interventionen auf die schulische Leistung konzentrierten, zeigt die vorliegende Studie, dass diese Maßnahmen auch das SWB betreffen. Weitere (längsschnittliche) Studien könnten darauf eingehen, inwieweit es letztendlich zu einem kumulativen Effekt auf die schulische Leistung kommen kann oder ob und inwiefern das SWB den Zusammenhang zwischen diesen Faktoren und der schulischen Leistung beeinflussen kann. [less ▲]

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See detailAre Value-Added Scores Stable Enough for High-Stakes Decisions?
Emslander, Valentin UL; Levy, Jessica UL; Scherer, Ronny et al

Scientific Conference (2022, March)

Theoretical Background: Can we quantify the effectiveness of a teacher or a school with a single number? Researchers in the field of value-added (VA) models may argue just that (e.g., Chetty et al., 2014 ... [more ▼]

Theoretical Background: Can we quantify the effectiveness of a teacher or a school with a single number? Researchers in the field of value-added (VA) models may argue just that (e.g., Chetty et al., 2014; Kane et al., 2013). VA models are widely used for accountability purposes in education and quantify the value a teacher or a school adds to their students’ achievement. For this purpose, these models predict achievement over time and attempt to control for factors that cannot be influenced by schools or teachers (i.e., sociodemographic & sociocultural background). Following this logic, what is left must be due to teacher or school differences (see, e.g., Braun, 2005). To utilize VA models for high-stakes decision-making (e.g., teachers’ tenure, the allocation of funding), these models would need to be highly stable over time. School-level stability over time, however, has hardly been researched at all and the resulting findings are mixed, with some studies indicating high stability of school VA scores over time (Ferrão, 2012; Thomas et al., 2007) and others reporting a lack of stability (e.g., Gorard et al., 2013; Perry, 2016). Furthermore, as there is no consensus on which variables to use as independent or dependent variables in VA models (Everson, 2017; Levy et al., 2019), the stability of VA could vary between different outcome measures (e.g., language or mathematics). If VA models lack stability over time and across outcome measures, their use as the primary information for high-stakes decision-making is in question, and the inferences drawn from them could be compromised. Questions: With these uncertainties in mind, we examine the stability of school VA model scores over time and investigate the differences between language and mathematics achievement as outcome variables. Additionally, we demonstrate the real-life implications of (in)stable VA scores for single schools and point out an alternative, more constructive use of school VA models in educational research. Method: To study the stability of VA scores on school level over time and across outcomes, we drew on a sample of 146 primary schools, using representative longitudinal data from the standardized achievement tests of the Luxembourg School Monitoring Programme (LUCET, 2021). These schools included a heterogeneous and multilingual sample of 7016 students. To determine the stability of VA scores in the subject of mathematics and in languages over time, we based our analysis on two longitudinal datasets (from 2015 to 2017 and from 2017 to 2019, respectively) and generated two VA scores per dataset, one for language and one for mathematics achievement. We further analyzed how many schools displayed stable VA scores in the respective outcomes over two years, and compared the rank correlations of VA scores between language and mathematics achievement as an outcome variable. Results and Their Significance: Only 34-38 % of the schools showed stable VA scores from grade 1 to 3 with moderate rank correlations of r = .37 with language and r = .34 with mathematics achievement. We therefore discourage using VA models as the only information for high-stakes educational decisions. Nonetheless, we argue that VA models could be employed to find genuinely effective teaching or school practices—especially in heterogeneous student populations, such as Luxembourg, in which educational disparities are an important topic already in primary school (Hoffmann et al., 2018). Consequently, we contrast the school climate and instructional quality, which might be a driver of the differences between schools with stable high vs. low VA scores. Literature Braun, H. (2005). Using student progress to evaluate teachers: A primer on value-added models. Educational Testing Service. Chetty, R., Friedman, J. N., & Rockoff, J. E. (2014). Measuring the impacts of teachers I: Evaluating bias in teacher value-added estimates. American Economic Review, 104(9), 2593–2632. https://doi.org/10.1257/aer.104.9.2593 Everson, K. C. (2017). Value-added modeling and educational accountability: Are we answering the real questions? Review of Educational Research, 87(1), 35–70. https://doi.org/10.3102/0034654316637199 Ferrão, M. E. (2012). On the stability of value added indicators. Quality & Quantity, 46(2), 627–637. https://doi.org/10.1007/s11135-010-9417-6 Gorard, S., Hordosy, R., & Siddiqui, N. (2013). How unstable are “school effects” assessed by a value-added technique? International Education Studies, 6(1), 1–9. https://doi.org/10.5539/ies.v6n1p1 Kane, T. J., McCaffrey, D. F., Miller, T., & Staiger, D. O. (2013). Have We Identified Effective Teachers? Validating Measures of Effective Teaching Using Random Assignment. Research Paper. MET Project. Bill & Melinda Gates Foundation. https://files.eric.ed.gov/fulltext/ED540959.pdf Levy, J., Brunner, M., Keller, U., & Fischbach, A. (2019). Methodological issues in value-added modeling: An international review from 26 countries. Educational Assessment, Evaluation and Accountability, 31(3), 257–287. https://doi.org/10.1007/s11092-019-09303-w LUCET. (2021). Épreuves Standardisées (ÉpStan). https://epstan.lu Perry, T. (2016). English value-added measures: Examining the limitations of school performance measurement. British Educational Research Journal, 42(6), 1056–1080. https://doi.org/10.1002/berj.3247 Thomas, S., Peng, W. J., & Gray, J. (2007). Modelling patterns of improvement over time: Value added trends in English secondary school performance across ten cohorts. Oxford Review of Education, 33(3), 261–295. https://doi.org/10.1080/03054980701366116 [less ▲]

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See detailTechnical Sovereignty and Digital Democracy in Europe – Follower or Influencer ? A New Media Approach
Danescu, Elena UL

Scientific Conference (2022, February 04)

The digital turn has considerably impacted geopolitics in terms of power, governance and regulation, leading to a proliferation of stakeholders and networks at multiple levels (states, international ... [more ▼]

The digital turn has considerably impacted geopolitics in terms of power, governance and regulation, leading to a proliferation of stakeholders and networks at multiple levels (states, international organisations, private companies, civil society and citizens), new dynamics of competition in a transnational space that is becoming increasingly virtual, borderless and deterritorialised (cyberspace), and novel forms of learning, work and human activity. Digital technologies have also brought about a paradigm shift in information and communication systems, with the emergence of new media (online platforms, interactive websites, algorithmic decision-making ecosystems, etc.) that will have a long-term impact on social and cultural practices, interpersonal and societal relations, the public sphere and the exercise of individual and collective democracy. [less ▲]

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See detail“Spread or die”. Online Virality as a Transmedia Phenomenon
Schafer, Valerie UL; Pailler, Fred UL

Scientific Conference (2022, February 03)

Memes (Kaplan and Nova, 2016; McGrath, 2019), gifs (Eppink, 2014), buzz on the Web and social networks are inherent to digital cultures since the very first steps of the Web (i.e., Dancing babies, Hamster ... [more ▼]

Memes (Kaplan and Nova, 2016; McGrath, 2019), gifs (Eppink, 2014), buzz on the Web and social networks are inherent to digital cultures since the very first steps of the Web (i.e., Dancing babies, Hamster Dance). Virality has developed and changed over time through several platforms (YouTube, 4Chan, Twitter, TikTok, etc.), while relying on some patterns identified by Shifman (2014), Milner (2018), Jenkins (2009) and others. Historicizing virality through times, spaces and platforms is at the heart of the Hivi project1 (https://hivi.uni.lu). While starting to historicize these phenomena, may it be Numa Numa Guy, Leave Britney Alone, Grumpy Cat, the Harlem Shake, online challenges (Ice Bucket Challenge, Fire challenge, etc.) and many others, the transmedia circulations and the role played by “traditional media” in the life cycles and virality of such practices have become more and more obvious. This proposal aims therefore to demonstrate and analyze how Internet phenomena are transmedia. Building upon several case studies, this presentation will first remind us how virality occurred before the digital (Pinker, 2020) and how previous historical forms were also reused in the digital. We will then analyse the circulation between online viral phenomena and other media, may it be Internet phenomena that are echoed in other media (press, cinema, video games...) or on the contrary the use of media phenomena by digital cultures (see for example memes related to Chuck Norris or Sad Keanu). Finally, the last part will specifically focus on the relationship between online virality and the general press, relying on a vast corpus gathered through Europresse, on which we conducted a diachronic distant reading. This intertwinement of Media cultures and Digital Cultures aim at highlightening several topics of the call and notably Temporalities of media through digital technologies; Persistence and discontinuities in communication; and finally Digital sources, new practices, tools and narratives in media history. References Eppink, J., “A brief history of the GIF”, Journal of Visual Culture, 2014, 13(3), p. 298- 306. Jenkins, H., « If it doesn’t spread, it’s dead (Part One) : Media Viruses and Memes”, Confessions of an Aca-Fan, 2009. http://henryjenkins.org/blog/2009/02/if_it_doesnt_spread_its_dead_p.html Kaplan, D., Nova, N., La culture Internet des Mèmes, Lausanne, PPUR, 2016. MacGrath, J., “Memes”, in Brügger, N., Milligan, I. (ed.), The Sage handbook of Web History, Los Angeles, London, Sage, 2019. Milner, R., The Word Mad Meme. Public Conversations and Participatory Media, Cambridge, MA, MIT Press, 2018. Shifman, L., Memes in Digital Culture, Cambridge MA, Mit Press, 2014. Pinker, R., Fake News & Viralité avant Internet. Les lapins du Père-Lachaise et autres légendes médiatiques, Paris, CNRS Éditions, 2020. [less ▲]

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See detailApproaching border complexities: von der Linie zur Textur
Wille, Christian UL

Scientific Conference (2022, February)

Die Renaissance von Grenzen hat nicht nur für eine stärkere Institutionalisierung und Sichtbarkeit der Grenzforschung gesorgt, sondern auch theoretisch-konzeptionelle Entwicklungen und Neuorientierungen ... [more ▼]

Die Renaissance von Grenzen hat nicht nur für eine stärkere Institutionalisierung und Sichtbarkeit der Grenzforschung gesorgt, sondern auch theoretisch-konzeptionelle Entwicklungen und Neuorientierungen in Gang gesetzt. Davon zeugen die zahlreichen Konzepte und Ansätze, die – inspiriert vom cultural, spatial und practice turn der Sozial- und Kulturwissenschaften – die Grenze als soziale Praxis fassen. Die Prozessorientierung überwindet die Idee der Grenze als Linie und bildet den Ausgangspunkt des Vortrags. Er zeigt verschiedene Weiterentwicklungen des sogenannten „‘bordering turn‘“ (Cooper 2020: 17) auf und geht dabei näher auf komplexitätsorientierte Ansätze als jüngsten Trend der territorialen und kulturellen Grenzforschung ein. [less ▲]

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See detailAI and Education. Luxemborug and Estonia
Baumann, Isabell Eva UL

Scientific Conference (2022, February)

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See detailDas ehemalige Schloss "La Fontaine" und sein Areal in Luxemburg-Clausen - Einführung in die Tagungsthematik
Uhrmacher, Martin UL

Scientific Conference (2022, February)

On the basis of the current state of historical, archaeological and architectural research, the 15 speakers at the conference took an interdisciplinary look at the possibilities for future use and ... [more ▼]

On the basis of the current state of historical, archaeological and architectural research, the 15 speakers at the conference took an interdisciplinary look at the possibilities for future use and landscaping of the former palace and its gardens. [less ▲]

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See detailAchievements and Developments of the UniGR-Center for Border Studies
Wille, Christian UL

Scientific Conference (2022, February)

The UniGR-Center for Border Studies (UniGR-CBS) is a thematic cross-border network of approximately 80 researchers within the university grouping University of the Greater Region (UniGR) conducting ... [more ▼]

The UniGR-Center for Border Studies (UniGR-CBS) is a thematic cross-border network of approximately 80 researchers within the university grouping University of the Greater Region (UniGR) conducting research on borders, their meanings and challenges. [less ▲]

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See detailPreliminary findings: EMN-OECD InformDigitalisation and Artificial Intelligence
Sommarribas, Adolfo UL

Scientific Conference (2022, January 27)

This presentation provides the preliminary findings of the EMN-OECD Inform on Digitalisation and Artificial Intelligence. It aims to analyse the use of digitalisation and artificial intelligence in ... [more ▼]

This presentation provides the preliminary findings of the EMN-OECD Inform on Digitalisation and Artificial Intelligence. It aims to analyse the use of digitalisation and artificial intelligence in migration management. [less ▲]

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See detailIm Spannungsfeld zwischen Informationsfreiheit und Datenschutz: Das Luxemburger Archivgesetz von 2018 und die zeithistorische Forschung
Brüll, Christoph UL; Janz, Nina UL

Scientific Conference (2022, January 19)

Im Sommer 2018 trat in Luxemburg erstmals ein Archivgesetz in Kraft, das nach jahrelangen Verhandlungen – leider ohne Beteiligung der Archivnutzer*innen – zustande kam. Es war lange erwartet und ... [more ▼]

Im Sommer 2018 trat in Luxemburg erstmals ein Archivgesetz in Kraft, das nach jahrelangen Verhandlungen – leider ohne Beteiligung der Archivnutzer*innen – zustande kam. Es war lange erwartet und definierte für das Großherzogtum (endlich!), wie Quellen aus Ministerien und Verwaltungen archivalisch behandelt werden müssen. Das Gesetz schuf damit den Rahmen für eine notwendige und geregelte Ablieferungs- und Archivierungspolitik sowie den erforderlichen Einsatz von geschultem Personal in staatlichen und kommunalen Verwaltungen. Der Gesetzestext weist große Ähnlichkeiten mit bundesdeutschen und belgischen Bestimmungen zum Archivzugang auf. Die allgemeine Schutzfrist von 50 Jahren ist allerdings deutlich länger als in den meisten Ländern, wohingegen die 75-Jahre-Sperrfrist für Akten mit persönlichen Daten auf dem Papier kürzer ausfällt als bei den Nachbarn. Die Auslegung des Gesetzes durch das Nationalarchiv und die Ministerialverwaltungen war seitdem mehrmals Gegenstand von parlamentarischen Fragen und Presseberichterstattung, die die restriktive Zugangspraxis und lange Bearbeitungszeiten bei Anträgen auf Schutzfristverkürzung monieren. Den Forscher*innen fielen dabei zwei Dinge auf: zum einen wurde die Entscheidungsfrist für die Anträge auf Schutzfristverkürzungen regelmäßig deutlich überschritten; zum anderen legten die Archivmitarbeiter*innen ihren Entscheidungen, ob ein solcher Antrag vonnöten sei, ein extrem rigides Verständnis von „persönlichen Daten“ zugrunde. Dies verweist auf einige Grundprobleme bei der Konzeption des Gesetzes: die wissenschaftliche Forschung, die ein großes Interesse daran hatte, bei der Archivnutzung Rechtssicherheit zu haben, war zu keinem Zeitpunkt in den Gesetzgebungsprozess eingebunden. Zum anderen problematisierte dieser zu wenig die Tatsache, dass das Nationalarchiv historisch als eine kulturelle und nicht als eine wissenschaftliche Einrichtung betrachtet wurde. Dies war nach unserer Auffassung ein weiterer Grund dafür, dass die Perspektive der Forschung nicht ausreichend mitgedacht wurde. In der Praxis wird beispielsweise der Zugang zu Dokumenten aus der Zeit des Zweiten Weltkriegs noch regelmäßig erschwert; an eine zeitgeschichtliche Forschung zum Zeitraum ab den 1960er Jahren auf der Grundlage der im Nationalarchiv aufbewahrten Quellen ist kaum zu denken. Das Nationalarchiv nimmt eine restriktive Haltung gegenüber seinen Nutzer*innen ein: Inventare, wie z.B. vorläufige Abgabelisten, werden nicht vorgelegt, ganze Bestände werden wegen mangelnder Bearbeitung oder Unkenntnis der Zuständigkeiten gesperrt. Den Forscher*innen wird kein Vertrauen entgegengebracht. Es besteht beispielsweise keine Möglichkeit, Dokumente nach Zusicherung von Anonymisierung oder Unterzeichnung einer Verpflichtungserklärung einzusehen. Die Einsicht (falls gesperrt) bedarf noch immer teilweise der Zustimmung durch die Aktenproduzenten. Mitunter ist aber den Benutzern nicht klar, welche Akten noch dem Produzenten unterliegen oder nicht. In anderen Fällen ist selbst dem Archiv nicht klar, wer die „Zuständigkeit“ und damit das letzte Wort über den Zugang innehat. Solange aber das Archiv nicht die Benutzungshoheit oder die „Archivhoheit“ über seine eigenen Akten hat, kann keine professionelle Benutzung gewährleistet werden. In Bezug auf die Gemeindearchive gilt das Archivgesetz von 2018 nicht, daher ist dort die Verunsicherung sehr groß und es fehlt das Bewusstsein für eine geordnete Archivierung und Bereitstellung von Unterlagen. Es fehlen beispielsweise Benutzungsordnungen und professionelle Findmittel. Im Falle von Akteneinsichten müssen die Forscher mit der zuständigen Gemeinde eine Art Datenschutzvertrag (Convention de mise á disposition d’archives et collections) schließen, in welches jedes Dokument aufgelistet wird. Seitdem die Probleme mit dem Gesetz und seiner Anwendung bekannt sind, wurden regelmäßig Lösungsansätze diskutiert, die jedoch bisher nicht umgesetzt wurden. Zum einen wird angeregt, die Entscheidungen zu Schutzfristverkürzungen in die Hände des Nationalarchivs zu legen. Dazu wären, wie in anderen Ländern auch, Abkommen zwischen den Ministerialverwaltungen und dem Archiv nötig. In der Zwischenzeit ist jedoch Bewegung in die Sache gekommen: zumindest auf der politischen Ebene ist das Bewusstsein dafür, dass überhaupt ein Problem besteht, gewachsen. Im Raum steht derzeit eine Evaluierung des Gesetzes, die bisher nicht vorgesehen war – obwohl eine solche Vorgehensweise bei anderen Gesetzen regelmäßig praktiziert wird – und die mündlich signalisierte Bereitschaft der Justizministerin, für die ihr unterstellten Bereiche ein Abkommen mit dem Archiv zu schließen. Vielleicht kann so ein Paradox aufgelöst werden. [less ▲]

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See detailRevealing defect-induced spin disorder in nanocrystalline
Bersweiler, Mathias UL

Scientific Conference (2022, January)

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Peer Reviewed
See detailThe Green Stock Market Bubble
Lehnert, Thorsten UL

Scientific Conference (2022, January)

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See detailSymbiotic Radio based Spectrum Sharing in Cooperative UAV-IRS Wireless Networks
Solanki, Sourabh UL; Gautam, Sumit; Singh, Vibhum UL et al

Scientific Conference (2022)

Ambient backscatter communication (AmBC) technology can potentially offer spectral- and energy-efficient solutions for future wireless systems. This paper proposes a novel design to facilitate the ... [more ▼]

Ambient backscatter communication (AmBC) technology can potentially offer spectral- and energy-efficient solutions for future wireless systems. This paper proposes a novel design to facilitate the spectrum sharing between a secondary system and a primary system based on the AmBC technique in intelligent reflective surface (IRS)-assisted unmanned aerial vehicle (UAV) networks. In particular, an IRS-aided UAV cooperatively relays the transmission from a terrestrial primary source node to a user equipment on the ground. On the other hand, leveraging on the AmBC technology, a terrestrial secondary node transmits its information to a terrestrial secondary receiver by modulating and backscattering the ambient relayed radio frequency (RF) signals from the UAV-IRS. The performance of such a system setup is analyzed by deriving the expressions of outage probability and ergodic spectral efficiency. Finally, we present the numerical results to provide useful insights into the system design and also validate the derived theoretical results using Monte Carlo simulations. [less ▲]

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See detailGeometrie der römischen Mosaiken
Perucca, Antonella UL

Scientific Conference (2022)

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See detailDeep Learning-Based Device-Free Localization in Wireless Sensor Networks
Abdullah, Osamah; Al-Hraishawi, Hayder UL; Chatzinotas, Symeon UL

Scientific Conference (2022)

Location-based services (LBS) are witnessing a rise in popularity owing to their key features of delivering powerful and personalized digital experiences. The recent developments in wireless sensing ... [more ▼]

Location-based services (LBS) are witnessing a rise in popularity owing to their key features of delivering powerful and personalized digital experiences. The recent developments in wireless sensing techniques make the realization of device-free localization (DFL) feasible in wireless sensor networks. The DFL is an emerging technology that utilizes radio signal information for detecting and positioning a passive target while the target is not equipped with a wireless device. However, determining the characteristics of the massive raw signals and extracting meaningful discriminative features relevant to the localization are highly intricate tasks. Thus, deep learning (DL) techniques can be utilized to address the DFL problem due to their unprecedented performance gains in many practical problems. In this direction, we propose a DFL framework consists of multiple convolutional neural network (CNN) layers along with autoencoders based on the restricted Boltzmann machines (RBM) to construct a convolutional deep belief network (CDBN) for features recognition and extracting. Each layer has stochastic pooling to sample down the feature map and reduced the dimensions of the required data for precise localization. The proposed framework is validated using real experimental dataset. The results show that our algorithm can achieve a high accuracy of 98\% with reduced data dimensions and low signal-to-noise ratios (SNRs). [less ▲]

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