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See detailL'Histoire avec sa grande Hache et la Plume
Scuto, Denis UL

Article for general public (2019)

A chronicle by historian Denis Scuto on the new novel of Jean Portante about the migrations of twins, Lorenzo and Antonio Tramagni from San Demetrio (Abruzze, Italy), the one to New York and West Virginia ... [more ▼]

A chronicle by historian Denis Scuto on the new novel of Jean Portante about the migrations of twins, Lorenzo and Antonio Tramagni from San Demetrio (Abruzze, Italy), the one to New York and West Virginia, the other to Hussigny (Lorraine, France) and Differdange (Luxembourg), their fates and those of their descendants, closely linked to the tragedies of 20th century. [less ▲]

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See detailSoftwarization of SCADA: Lightweight Statistical SDN-Agents for Anomaly Detection
Rinaldi, Giulia UL; Adamsky, Florian UL; Soua, Ridha UL et al

in 10th International Conference on Networks of the Future (NoF) (2019, October 04)

The increasing connectivity of restricted areas suchas Critical Infrastructures (CIs) raises major security concernsfor Supervisory Control And Data Acquisition (SCADA) systems,which are deployed to ... [more ▼]

The increasing connectivity of restricted areas suchas Critical Infrastructures (CIs) raises major security concernsfor Supervisory Control And Data Acquisition (SCADA) systems,which are deployed to monitor their operation. Given the impor-tance of an early anomaly detection, Intrusion Detection Systems(IDSs) are introduced in SCADA systems to detect malicious ac-tivities as early as possible. Agents or probes form the cornerstoneof any IDS by capturing network packets and extracting relevantinformation. However, IDSs are facing unprecedented challengesdue to the escalation in the number, scale and diversity of attacks.Software-Defined Network (SDN) then comes into play and canprovide the required flexibility and scalability. Building on that,we introduce Traffic Agent Controllers (TACs) that monitor SDN-enabled switches via OpenFlow. By using lightweight statisticalmetrics such as Kullback-Leibler Divergence (KLD), we are ableto detect the slightest anomalies, such as stealth port scans, evenin the presence of background traffic. The obtained metrics canalso be used to locate the anomalies with precision over 90%inside a hierarchical network topology. [less ▲]

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See detailThe Power of LC-MS Based Multiomics: Exploring Adipogenic Differentiation of Human Mesenchymal Stem/Stromal Cells
Rampler, Evelyn; Egger, Dominik; Schoeny, Harald et al

in Molecules (2019)

The molecular study of fat cell development in the human body is essential for our understanding of obesity and related diseases. Mesenchymal stem/stromal cells (MSC) are the ideal source to study fat ... [more ▼]

The molecular study of fat cell development in the human body is essential for our understanding of obesity and related diseases. Mesenchymal stem/stromal cells (MSC) are the ideal source to study fat formation as they are the progenitors of adipocytes. In this work, we used human MSCs, received from surgery waste, and differentiated them into fat adipocytes. The combination of several layers of information coming from lipidomics, metabolomics and proteomics enabled network analysis of the biochemical pathways in adipogenesis. Simultaneous analysis of metabolites, lipids, and proteins in cell culture is challenging due to the compound’s chemical difference, so most studies involve separate analysis with unimolecular strategies. In this study, we employed a multimolecular approach using a two–phase extraction to monitor the crosstalk between lipid metabolism and protein-based signaling in a single sample (~105 cells). We developed an innovative analytical workflow including standardization with in-house produced 13C isotopically labeled compounds, hyphenated high-end mass spectrometry (high-resolution Orbitrap MS), and chromatography (HILIC, RP) for simultaneous untargeted screening and targeted quantification. Metabolite and lipid concentrations ranged over three to four orders of magnitude and were detected down to the low fmol (absolute on column) level. Biological validation and data interpretation of the multiomics workflow was performed based on proteomics network reconstruction, metabolic modelling (MetaboAnalyst 4.0), and pathway analysis (OmicsNet). Comparing MSCs and adipocytes, we observed significant regulation of different metabolites and lipids such as triglycerides, gangliosides, and carnitine with 113 fully reprogrammed pathways. The observed changes are in accordance with literature findings dealing with adipogenic differentiation of MSC. These results are a proof of principle for the power of multimolecular extraction combined with orthogonal LC-MS assays and network construction. Considering the analytical and biological validation performed in this study, we conclude that the proposed multiomics workflow is ideally suited for comprehensive follow-up studies on adipogenesis and is fit for purpose for different applications with a high potential to understand the complex pathophysiology of diseases. [less ▲]

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See detailArchives du Web, "la cathédrale et le bazar"
Schafer, Valerie UL

Presentation (2019, October 03)

Le groupe de travail Ethique & Droit a organisé, avec le soutien de l’URFIST Méditerranée, une journée d’étude intitulée « Diffuser les données numériques en SHS : le droit et l’éthique comme alliés » ... [more ▼]

Le groupe de travail Ethique & Droit a organisé, avec le soutien de l’URFIST Méditerranée, une journée d’étude intitulée « Diffuser les données numériques en SHS : le droit et l’éthique comme alliés ». S’inscrivant dans la dynamique de la science ouverte, cette journée d’étude a présenté l’actualité juridique et éthique de la diffusion des données en SHS tout en précisant les orientations actuelles des institutions d’enseignement et de recherche en la matière. De nouvelles problématiques, comme celles soulevées par les archives du web, ont été abordées, notamment lors de mon intervention qui prenait pour point de départ la référence à l'ouvrage d'E. Raymond et les différents modèles de conservation et d'accès aux archives du Web mais aussi les enjeux éthiques posés par les périmètres de conservation notamment. voir: https://ethiquedroit.hypotheses.org/3003 [less ▲]

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See detailLe jugement par défaut dans l'espace judiciaire européen
Richard, Vincent Jérôme UL

Doctoral thesis (2019)

French judges regularly refuse to enforce foreign judgements rendered by default against a defendant who has not appeared. This finding is also true for other Member States, as many European regulations ... [more ▼]

French judges regularly refuse to enforce foreign judgements rendered by default against a defendant who has not appeared. This finding is also true for other Member States, as many European regulations govern cross-border enforcement of decisions rendered in civil and commercial matters between Member States. The present study examines this problem in order to understand the obstacles to the circulation of default decisions and payment orders in Europe. When referring to the recognition of default judgments, it would be more accurate to refer to the recognition of decisions made as a result of default proceedings. It is indeed this (default) procedure, more than the judgment itself, which is examined by the exequatur judge to determine whether the foreign decision should be enforced. This study is therefore firstly devoted to default procedures and payment order procedures in French, English, Belgian and Luxembourgish laws. These procedures are analysed and compared in order to highlight their differences, be they conceptual or simply technical in nature. Once these discrepancies have been identified, this study turns to private international law in order to understand which elements of the default procedures are likely to hinder their circulation. The combination of these two perspectives makes it possible to envisage a gradual approximation of national default procedures in order to facilitate their potential circulation in the European area of freedom, security and justice. [less ▲]

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See detailCurriculum Development in Multilingual Societies: the example of Luxembourg
Sattler, Sabrina UL

Presentation (2019, October 03)

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See detailEnforcing the European Pillar of Social Rights: Finding the Right Mix and Balance
Muñoz, Susana UL

in Effective Enforcement of EU Law & Policy <www.euenforcement.com/research-blog-1> (2019)

Against the backdrop of the recent multidimensional crisis, significant changes have been introduced to the legal and political frameworks in which the EU and its Member States design, implement, monitor ... [more ▼]

Against the backdrop of the recent multidimensional crisis, significant changes have been introduced to the legal and political frameworks in which the EU and its Member States design, implement, monitor and evaluate policies and practices. Both the nature and the content of the European Pillar of Social Rights (EPSR) raise issues regarding effective enforcement of EU law and policy in the post-crisis context. From this perspective, this contribution addresses the main challenges facing the EPRS and explores possible ways forward. [less ▲]

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See detailLattice dynamics and Raman spectrum of BaZrO3 single crystals
Toulouse, Constance UL; Amoroso, Danila; Xin, Cong et al

in PHYSICAL REVIEW B (2019), 100

BaZrO3 is a perovskite that remains in the simple cubic phase at all temperatures, hence with no first-order Raman-active phonon mode allowed by symmetry. Yet, it exhibits an intense Raman spectrum with ... [more ▼]

BaZrO3 is a perovskite that remains in the simple cubic phase at all temperatures, hence with no first-order Raman-active phonon mode allowed by symmetry. Yet, it exhibits an intense Raman spectrum with sharp and well-defined features. Here, we report the evolution of the Raman spectrum of BaZrO3 single crystals in a broad temperature range (4-1200 K) and discuss its origin with the support of detailed first-principle calculations of the lattice dynamics. Phonon calculations are performed not only for the cubic phase of BaZrO3, but also for the low-symmetry phases with octahedra tilts that have been suspected to exist at the nanoscale. We show that the Raman spectrum shows no direct evidence for these nanodomains, but can instead be explained by classical second-order Raman scattering. We provide an assignment of the dominant features to phonon mode combinations. In particular, we show that the high frequency range of the spectrum is dominated by overtones and shows an image of the phonon density of states corresponding to the stretching modes of the oxygen octahedra. [less ▲]

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See detailThe Implementation of the Cross-Border Mergers Directive in Luxembourg
Corbisier, Isabelle UL

in Papadopoulos, Thomas (Ed.) Cross-Border Mergers - EU Perspectives and National Experiences (2019)

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See detailA Forcing Fictitious Domain Method to Simulate Fluid-particle Interaction of Particles with Super-quadric Shape
Wu, Mingqiu UL; Peters, Bernhard UL; Rosemann, Tony et al

in Powder Technology (2019), 360(15/January 2020), 264-277

In this work, we develop a new framework to directly simulate super-quadric (SQ) particles in fluid flows based on a forcing fictitious domain method. Specifically, a super-quadric particle function is ... [more ▼]

In this work, we develop a new framework to directly simulate super-quadric (SQ) particles in fluid flows based on a forcing fictitious domain method. Specifically, a super-quadric particle function is used to represent the particle shape of different types in a flexible manner. The immersion of particles in the fluid is handled by imposing rigid solid body motion in the particle domain, as well as adding a local forcing term to the Navier-Stokes equations by calculating the integral of both the pressure gradient and the particle velocity over the whole particle domain. Particle shapes are varied by changing the five super-quadric parameters of the SQ equation. We validate our approach by performing simulations of flow around a fixed particle and sedimentation of a particle in a channel in 2D and 3D. The validation results indicate that the current simulation results show a good agreement with experimental data. Moreover, our method is used to study the flow around fixed non-spherical particles with different orientations and particle Reynolds numbers. The particle Reynolds numbers vary from 0.1 to 3000. The super-quadric particles exemplarily considered in the current study are an ellipsoidal particle and fibre-like particles. We present the results for drag and lift coefficients at different particle orientations and different particle Reynolds numbers. The obtained results lay the foundation to apply the framework to flown through multi-particle systems in the near future. [less ▲]

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See detailElectoral Violence Under Different Contexts. Evidence from the Western Balkans
Mochtak, Michal UL

in Nations and Nationalism (2019), 25(4), 1325-1361

The paper addresses the question of what settings are empirically relevant for the occurrence of electoral violence in the region of Western Balkans and what theoretical paths may cover their logic ... [more ▼]

The paper addresses the question of what settings are empirically relevant for the occurrence of electoral violence in the region of Western Balkans and what theoretical paths may cover their logic. Electoral violence has been part of the electoral arenas in the region for decades and although it has evolved and in some cases disappeared, a number of countries still experience it. The paper analyses original data on electoral violence collected from the OSCE monitoring reports covering 56 parliamentary elections organized between 1990 and 2015. Applying fuzzy‐set Qualitative Comparative Analysis (fsQCA), the paper identifies four sub-models under which electoral violence is observed. The conjunctural logic that defines each and every of the discussed paths within the sub-models shows that the scenarios of electoral violence in the Western Balkans are always complex and potentially relevant conditions are never sufficient for the outcome on their own. [less ▲]

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See detailUser Experience Design for E-Voting: How mental models align with security mechanisms
Zollinger, Marie-Laure UL; Distler, Verena UL; Roenne, Peter UL et al

in Electronic Voting (2019, October)

This paper presents a mobile application for vote-casting and vote-verification based on the Selene e-voting protocol and explains how it was developed and implemented using the User Experience Design ... [more ▼]

This paper presents a mobile application for vote-casting and vote-verification based on the Selene e-voting protocol and explains how it was developed and implemented using the User Experience Design process. The resulting interface was tested with 38 participants, and user experience data was collected via questionnaires and semi-structured interviews on user experience and perceived security. Results concerning the impact of displaying security mechanisms on UX were presented in a complementary paper. Here we expand on this analysis by studying the mental models revealed during the interviews and compare them with theoretical security notions. Finally, we propose a list of improvements for designs of future voting protocols. [less ▲]

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

Scientific Conference (2019, October)

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

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

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See detailBericht über die "Demenzforschungstage" 2019. Einbezug von Betroffenen in die Forschung zu kognitivem Altern und Demenz
Leist, Anja UL

Report (2019)

On 19 and 20 September 2019, the first "Dementia Research Days" took place on the Belval campus of the University of Luxembourg. People living with dementia were invited to the university to discuss the ... [more ▼]

On 19 and 20 September 2019, the first "Dementia Research Days" took place on the Belval campus of the University of Luxembourg. People living with dementia were invited to the university to discuss the research questions of the ERC-CRISP project and to advise the researchers on the dissemination of the research results. The idea of giving people affected by dementia a voice in research projects is already being successfully implemented in other countries such as the UK. The report presents some information on the research project for the general public. After that, the contributions of the participants are summarised. [less ▲]

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See detailEvent Notification in CAN-based Sensor Networks
Bloom, Gedare; Cena, Gianluca; Cibrario Bertolotti, Ivan et al

in IEEE Transactions on Industrial Informatics (2019), 15(10), 5613-5625

Preventive and reactive maintenance require the collection of an ever-increasing amount of information from industrial plants and other complex systems, like those based on robotized cells, a need that ... [more ▼]

Preventive and reactive maintenance require the collection of an ever-increasing amount of information from industrial plants and other complex systems, like those based on robotized cells, a need that can be fulfilled by means of a suitable event notification mechanism. At the same time, timing and delivery reliability requirements in those scenarios are typically less demanding than in other cases, thus enabling the adoption of best-effort notification approaches. This paper presents, evaluates, and compares some of those approaches, based on either standard CAN messaging or a recently proposed protocol extension called CAN XR. In the second case, the combined use of Bloom filters is also envisaged to increase flexibility. Results show that the latter approaches are advantageous in a range of event generation rates and network topologies of practical relevance. [less ▲]

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

Scientific Conference (2019, October)

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

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

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See detailA mechanical design model for steel and concrete composite members with web openings
Claßen, Martin; Kurz, Wolfgang; Schäfer, Markus UL et al

in Engineering Structures (2019), Engineering Structures 197:109417(109417),

In web opening regions, a significant share of the global shear force is redistributed from the perforated web of the steel beam to the reinforced concrete (RC) slab. This redistribution leads to vertical ... [more ▼]

In web opening regions, a significant share of the global shear force is redistributed from the perforated web of the steel beam to the reinforced concrete (RC) slab. This redistribution leads to vertical forces in the shear connectors close to both edges of the opening and influences the internal forces in the steel beam and the RC slab over a length of approximately three times the opening length a0. The global shear failure in the web opening region is affected by the rather brittle behavior of the concrete and is either characterized by a diagonal shear cracking failure of the RC slab, or a local bending failure at the opening edges, or vertical connector failure (concrete break-out) at the ends of the opening. This paper is intended to clarify the structural behavior of web opening regions and proposes easy-to-use models that make it possible to analyze the local internal forces of each partial beam in a mechanically consistent manner. Based on these models, a novel design procedure is presented, that allows efficient design and dimensioning of web openings as well as prediction of shear resistance and failure mode. [less ▲]

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See detailDie ‚Circular Economy‘ als Ausweg aus der Wachstumsfalle? Diskussionsbeitrag
Schulz, Christian UL

in Reckinger, Carole; Urbé, Robert (Eds.) Sozialalmanach 2019. Schwéierpunkt: Qualitativen Wuesstem (2019)

Detailed reference viewed: 56 (11 UL)