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

Report (2019)

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

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

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See detailBlasmusikausbildung. Über Bildungskategorien in der “community music”
Sagrillo, Damien UL

in Weber-Lucks, Theda; Brusniak, Friedhelm; Rhode-Jüchtern, Anna-Christine (Eds.) Würzburger Beiträge zur Kestenberg-Forschung. Festgabe für Andreas Eschen zum 65. Geburtstag (2019)

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See detailThe twin-PhD model contributs to knowledge production in Africa
Cubaka, Vincent Kalumire; Schriver, Michael; Uwizihiwe, Jean Paul et al

in The Lancet (2019), 393(10191), 2590

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See detailUne histoire contemporaine du Luxembourg en 70 chroniques
Scuto, Denis UL

Book published by Fondation Robert Krieps/Luxembourg Centre for Contemporary and Digital History (C2DH) avec l'appui de la Fondation Lydie Schmit (2019)

"A contemporary history of Luxembourg in 70 chronicles" by Denis Scuto is a collection of 70 press chronicles, published from 2014 to 2019 in the Luxembourg newspaper Tageblatt. It is "public history" in ... [more ▼]

"A contemporary history of Luxembourg in 70 chronicles" by Denis Scuto is a collection of 70 press chronicles, published from 2014 to 2019 in the Luxembourg newspaper Tageblatt. It is "public history" in the best sense of the word, because Denis Scuto as a professional historian intervenes directly in today's debates and enlightens them in a dazzling way by replacing them in the history of Luxembourg and Europe. It is a book aimed directly at the general public, which does not necessarily read scholarly works, but is interested in understanding the country in which it lives and works, with its indissolubly linked past and present. It is therefore a contemporary history because, over the course of the current debates commented by Denis Scuto, the essential elements of the construction of contemporary Luxembourg appear: the birth of the Grand Duchy as a nation-state, its hard learning of independence throughout the nineteenth century, political and social struggles, the consequences of the two world wars, its destiny as a country made of migratory flows, the upheaval of a rural country that became an industrial power and then a European and financial centre, etc. [less ▲]

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See detailOn the single-peakedness property
Devillet, Jimmy UL

Scientific Conference (2019, June 28)

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

Scientific Conference (2019, June 28)

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

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

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

Scientific Conference (2019, June 28)

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

Scientific Conference (2019, June 27)

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

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

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See detailCritical perspectives on plurilingual students' identity performance in sustainability education
Gorges, Anna UL

Doctoral thesis (2019)

The purpose of this critical video-ethnographic study is to gain new perspectives on how the open, dialogic structures in an alternative high school setting afford plurilingual adult students’ to take ... [more ▼]

The purpose of this critical video-ethnographic study is to gain new perspectives on how the open, dialogic structures in an alternative high school setting afford plurilingual adult students’ to take agency and the development of a positive student identity. With this goal, the study seeks to contribute to the research literature on plurilingual adult students and on nontraditional students learning about sustainability. The overarching question that guides this study is how does the figured world of multilingual sustainability education based on socioscientific issues mediate plurilingual adult students identities as competent science students? This study is multi-theoretical, multi-method, and multi-level, and as such, the manuscriptstyle dissertation presents several case studies of students as they participate in an interdisciplinary unit on sustainability. Situated in a superdiverse context, the data collection took place at an alternative high school, where students who dropped out of the traditional school system have the chance to get a leaving certificate. Data resources include video data, audio data, student artefacts, fieldnotes and photographs. Multimodal discourse analysis based on Gee (1996) was used to reveal the structures at the micro, meso and macro level that mediate learning for students in the alternative educational setting and afford them to make connections to their everyday lives. Three individual manuscripts examine three separate case studies regarding students’ use of transmodalling, students’ engagement in socio-scientific issues, and students’ perspectives on the holistic teaching and learning approaches in their school. Drawing on dialectic understandings of learning, the three case studies each illuminate holistic approaches to learning focusing on students’ multimodal means of expression, emotions and identity development that afford them with opportunities to take agency and create solidarity in the class and school community. This study concludes that dialogic pedagogy as space of possibilities mediates student’ development of identities as competent science learners, which has implications for their identities as agents positioned for transformative actions. [less ▲]

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

Scientific Conference (2019, June 26)

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

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See detailShift-symmetric configurations in two-dimensional cellular automata: Irreversibility, insolvability, and enumeration
Banda, Peter UL; Caughman, John; Cenek, Martin et al

in Chaos (2019), 29(6), 063120

The search for symmetry as an unusual yet profoundly appealing phenomenon, and the origin of regular, repeating configuration patterns have long been a central focus of complexity science and physics. To ... [more ▼]

The search for symmetry as an unusual yet profoundly appealing phenomenon, and the origin of regular, repeating configuration patterns have long been a central focus of complexity science and physics. To better grasp and understand symmetry of configurations in decentralized toroidal architectures, we employ group-theoretic methods, which allow us to identify and enumerate these inputs, and argue about irreversible system behaviors with undesired effects on many computational problems. The concept of so-called configuration shift-symmetry is applied to two-dimensional cellular automata as an ideal model of computation. Regardless of the transition function, the results show the universal insolvability of crucial distributed tasks, such as leader election, pattern recognition, hashing, and encryption. By using compact enumeration formulas and bounding the number of shift-symmetric configurations for a given lattice size, we efficiently calculate the probability of a configuration being shift-symmetric for a uniform or density-uniform distribution. Further, we devise an algorithm detecting the presence of shift-symmetry in a configuration. Given the resource constraints, the enumeration and probability formulas can directly help to lower the minimal expected error and provide recommendations for system’s size and initialization. Besides cellular automata, the shift-symmetry analysis can be used to study the non-linear behavior in various synchronous rule-based systems that include inference engines, Boolean networks, neural networks, and systolic arrays. [less ▲]

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See detailInvestor Schemes "Golden Passports" and "Golden Visas"
Sommarribas, Adolfo UL

Report (2019)

For the last 10 years, the EU Member States have been developing schemes to attract wealthy third-country national investors. To this end, Member States have facilitated the granting of visas or residence ... [more ▼]

For the last 10 years, the EU Member States have been developing schemes to attract wealthy third-country national investors. To this end, Member States have facilitated the granting of visas or residence permits and even implemented fast-track procedures for the acquisition of citizenship. The Commission’s report identified the following areas of concern: 1) Security: checks run on applicants are not sufficiently robust and the EU’s own centralised information systems, such as the Schengen Information System (SIS), are not being used as systematically as they should be; 2) Money laundering: enhanced checks (‘due diligence’) are necessary to ensure that rules on anti-money laundering are not circumvented; 3) Tax evasion: monitoring and reporting is necessary to make sure that individuals do not take advantage of these schemes to benefit from privileged tax rules; 4) Transparency and information: the report finds a lack of clear information on how the schemes are run, including on the number of applications received, granted or rejected and the origins of the applicants; and 5) In addition, Member States do not (routinely) exchange information on applicants for such schemes, nor do they inform each other of rejected applicants. [less ▲]

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See detailWhispering Botnet Command and Control Instructions
Steichen, Mathis UL; Ferreira Torres, Christof UL; Fiz Pontiveros, Beltran UL et al

in 2nd Crypto Valley Conference on Blockchain Technology, Zug 24-26 June 2019 (2019, June 25)

Detailed reference viewed: 34 (0 UL)
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See detailDeep dive into Interledger: Understanding the Ripple ecosystem
Trestioreanu, Lucian Andrei UL; Cassagnes, Cyril UL; State, Radu UL

Learning material (2019)

The goal of Interledger is to create an international friction-less payments routing system. The Interledger protocol is literally a protocol for inter-ledger payments. To achieve this goal, several ... [more ▼]

The goal of Interledger is to create an international friction-less payments routing system. The Interledger protocol is literally a protocol for inter-ledger payments. To achieve this goal, several aspects of the technology require a deeper analysis. For this reason, we created our own test-bed in our premises. By doing so, we notice that some aspects are well documented but we found that others might need more attention and clarification. Despite a large community effort, the task to keep information of a fast evolving software ecosystem is tedious and not always the priority for such a project. Therefore, the purpose of the following document is to consolidate all the relevant information to create a test-bed for the Interledger protocol between Ripple and Ethereum. [less ▲]

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

Scientific Conference (2019, June 23)

Detailed reference viewed: 52 (3 UL)
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See detailOverestimation of physical activity among young people: Does age and gender play a role?
Eckelt, Melanie UL; Hutmacher, Djenna UL; Steffgen, Georges UL et al

Scientific Conference (2019, June 22)

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

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

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See detailHigh Performance Parallel Coupling of OpenFOAM+XDEM
Besseron, Xavier UL; Pozzetti, Gabriele; Rousset, Alban UL et al

Presentation (2019, June 21)

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See detailAutomated optimisation of stem cell-derived neuronal cell culture in three dimensional microfluidic device
Kane, Khalid Ibnou Walid UL

Doctoral thesis (2019)

This dissertation is a compilation of publications and manuscripts that aim 1) to integrate an automated platform optimised for long term in vitro cell culture maintenance for Parkinson’s disease, long ... [more ▼]

This dissertation is a compilation of publications and manuscripts that aim 1) to integrate an automated platform optimised for long term in vitro cell culture maintenance for Parkinson’s disease, long term live cell imaging and the handling of many cell lines, 2) to combine physics principles with imaging techniques to optimise the seeding of Matrigel embedded human neuroepithelial stem cells into a three-dimensional microfluidic device, and 3) to combine engineering principles with cell biology to optimise the design of a three-dimensional microfluidic system based on phaseguide technology. In the first publication manuscript, we investigated Matrigel as a surrogate extracellular matrix in three-dimensional cell culture systems, including microfluidic cell culture. The study aimed at understanding and characterising the properties of Matrigel. Using classical rheological measurements of Matrigel (viscosity versus shear rate) in combination with fluorescence microscopy and fluorescent beads for particle image velocimetry measurements (velocity profiles), the shear rates experienced by cells in a microfluidic device for three-dimensional cell culture was characterised. We discussed how the result of which helped to mechanically optimise the use of Matrigel in microfluidic systems to minimise the shear stress experienced by cells during seeding in a microchannel. The second manuscript proposes a methodology to passively control the flow of media in a three-dimensional microfluidic channel. We used the fluid dynamic concept of similitude to dynamically replicate cerebral blood flow in a rectangular cross-sectional microchannel. This similarity model of a target cell type and a simple fluid flow mathematical prediction model was used to iterate the most optimum dimensions within some manufacturing constraints to adapt the design of the OrganoPlate, a cell culture plate fully compatible with laboratory automation, which allowed its re-dimension to achieve over 24h of flow for the culture of human neuroepithelial stem cells into midbrain specific dopaminergic neurons. In the third publication manuscript, we propose an automated cell culture platform optimised for long-term maintenance and monitoring of different cells in three-dimensional microfluidic cell culture devices. The system uses Standard in Laboratory Automation or SiLA, an open source standardisation which allows rapid software integration of laboratory automation hardware. The automation platform can be flexibly adapted to various experimental protocols and features time-lapse imaging microscopy for quality control and electrophysiology monitoring to assess cellular activity. It was biologically validated by differentiating Parkinson’s disease patient derived human neuroepithelial stem cells into midbrain specific dopaminergic neurons. This system is the first example of an automated Organ-on-a-Chip culture and has the potential to enable a versatile array of in vitro experiments for patient-specific disease modelling. Finally, the fourth manuscript initiates the assessment of the neuronal activity of induced pluripotent stem cell derived neurons from Parkinson’s Disease patients with LRRK2-G2019S mutations and isogenic controls. A novel image analysis pipeline that combined semi-automated neuronal segmentation and quantification of calcium transient properties was developed and used to analyse neuronal firing activity. It was found that LRRK2-G2019S mutants have shortened inter-spike intervals and an increased rate of spontaneous calcium transient induction than control cell lines. [less ▲]

Detailed reference viewed: 46 (4 UL)