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See detailMa thèse en 180 secondes version blogdroiteuropéen- par Simona Demková
Demkova, Simona UL

Article for general public (2021)

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See detailOn the Optimality of the Stationary Solution of Secrecy Rate Maximization for MIMO Wiretap Channel
Mukherjee, Anshu; Kumar, Vaibhav; Jorswieck, Eduard et al

in IEEE Wireless Communications Letters (2021)

To achieve perfect secrecy in a multiple-input multiple-output (MIMO) Gaussian wiretap channel (WTC), we need to find its secrecy capacity and optimal signaling, which involves solving a difference of ... [more ▼]

To achieve perfect secrecy in a multiple-input multiple-output (MIMO) Gaussian wiretap channel (WTC), we need to find its secrecy capacity and optimal signaling, which involves solving a difference of convex functions program known to be non-convex for the non-degraded case. To deal with this, a class of existing solutions have been developed but only local optimality is guaranteed by standard convergence analysis. Interestingly, our extensive numerical experiments have shown that these local optimization methods indeed achieve global optimality. In this paper, we provide an analytical proof for this observation. To achieve this, we show that the Karush-Kuhn-Tucker (KKT) conditions of the secrecy rate maximization problem admit a unique solution for both degraded and non-degraded cases. Motivated by this, we also propose a low-complexity algorithm to find a stationary point. Numerical results are presented to verify the theoretical analysis. [less ▲]

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See detailThe need of standardised metadata to encode causal relationships: Towards safer data-driven machine learning biological solutions
Garcia Santa Cruz, Beatriz UL; Vega Moreno, Carlos Gonzalo UL; Hertel, Frank UL

Scientific Conference (2021, November 16)

In this paper, we discuss the importance of considering causal relations in the development of machine learning solutions to prevent factors hampering the robustness and generalisation capacity of the ... [more ▼]

In this paper, we discuss the importance of considering causal relations in the development of machine learning solutions to prevent factors hampering the robustness and generalisation capacity of the models, such as induced biases. This issue often arises when the algorithm decision is affected by confounding factors. In this work, we argue that the integration of causal relationships can identify potential confounders. We call for standardised meta-information practices as a crucial step for proper machine learning solutions development, validation, and data sharing. Such practices include detailing the dataset generation process, aiming for automatic integration of causal relationships. [less ▲]

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See detailLe siège de la BGL - une banque et son architecture​ ​
Mouton, Victoria UL; Duval, Cécile UL; Gabellini, Marco UL

Presentation (2021, November 16)

L'histoire architecturale du siège de la Banque Générale du Luxembourg (BGL), est intimement liée à l’histoire urbanistique de la ville de Luxembourg. Le choix du quartier, du boulevard ou de la rue dans ... [more ▼]

L'histoire architecturale du siège de la Banque Générale du Luxembourg (BGL), est intimement liée à l’histoire urbanistique de la ville de Luxembourg. Le choix du quartier, du boulevard ou de la rue dans lequel la Banque va s'implanter a toute sa signification et n’est pas dû au hasard. Les choix architecturaux, l’emplacement d’un siège deviennent-ils alors des éléments qui contribuent à façonner l'identité d'une banque ? Ou est-ce que les mutations urbaines et les évolutions du secteur bancaire influencent-elles le style de la construction ? Tout au long de son histoire, depuis ses débuts en 1919 jusqu’à nos jours, les bâtiments du siège de la BGL situés dans le centre-ville et au Kirchberg ont connu plusieurs vies pour rester compétitifs dans un monde bancaire qui se crée et se cherche. Concomitant à l’émergence de la place financière dans le paysage urbain luxembourgeois, la Banque a dû aussi continuellement se réinventer. À travers un siècle riche en événements, le narratif que les dirigeants de la Banque ont souhaité véhiculer à travers la dimension architecturale du siège a donc aussi évolué. Il fallait bien évidemment se démarquer de la concurrence, des autres institutions financières établies dans des bâtisses plus ou moins prestigieuses. Les multiples mutations architecturales du siège, qu’il s’agisse d’agrandissements, de transformations ou de reconstructions, en témoignent. [less ▲]

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See detailZur Entwicklung des TSG unter Berücksichtigung der aktuellen politischen Debatte
de Silva, Adrian UL

E-print/Working paper (2021)

The article deals with developments regarding the Transsexual Act and the current political debate on trans law in the Federal Republic of Germany.

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See detailNot yet another digital identity
Rieger, Alexander UL; Roth, Tamara UL; Sedlmeir, Johannes UL et al

in Nature Human Behaviour (2021)

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See detailAndroid Malware Detection: Looking beyond Dalvik Bytecode
Sun, Tiezhu UL; Daoudi, Nadia UL; Allix, Kevin UL et al

in 2021 36th IEEE/ACM International Conference on Automated Software Engineering Workshops (ASEW) (2021, November 15)

Machine learning has been widely employed in the literature of malware detection because it is adapted to the need for scalability in vetting large scale samples of Android. Feature engineering has ... [more ▼]

Machine learning has been widely employed in the literature of malware detection because it is adapted to the need for scalability in vetting large scale samples of Android. Feature engineering has therefore been the key focus for research advances. Recently, a new research direction that builds on the momentum of Deep Learning for computer vision has produced promising results with image representations of Android byte- code. In this work, we postulate that other artifacts such as the binary (native) code and metadata/configuration files could be looked at to build more exhaustive representations of Android apps. We show that binary code and metadata files can also provide relevant information for Android malware detection, i.e., that they can allow to detect Malware that are not detected by models built only on bytecode. Furthermore, we investigate the potential benefits of combining all these artifacts into a unique representation with a strong signal for reasoning about maliciousness. [less ▲]

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See detailHeterogeneously-Distributed Joint Radar Communications: Bayesian Resource Allocation
Wu, Linlong; Mishra, Kumar Vijay; Mysore Rama Rao, Bhavani Shankar UL et al

in 2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) (2021, November 15)

Due to spectrum scarcity, the coexistence of radar and wireless communication has gained substantial research interest recently. Among many scenarios, the heterogeneously-distributed joint radar ... [more ▼]

Due to spectrum scarcity, the coexistence of radar and wireless communication has gained substantial research interest recently. Among many scenarios, the heterogeneously-distributed joint radar-communication system is promising due to its flexibility and compatibility of existing architectures. In this paper, we focus on a heterogeneous radar and communication network (HRCN), which consists of various generic radars for multiple target tracking (MTT) and wireless communications for multiple users. We aim to improve the MTT performance and maintain good throughput levels for communication users by a well-designed resource allocation. The problem is formulated as a Bayesian Cramér-Rao bound (CRB) based minimization subjecting to resource budgets and throughput constraints. The formulated nonconvex problem is solved based on an alternating descent-ascent approach. Numerical results demonstrate the efficacy of the proposed allocation scheme for this heterogeneous network. [less ▲]

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See detailA First Look at Security Risks of Android TV Apps
Liu, Yonhui; Li, Li; Kong, Pingfan UL et al

in A First Look at Security Risks of Android TV Apps (2021, November 15)

In this paper, we present to the community the first preliminary study on the security risks of Android TV apps. To the best of our knowledge, despite the fact that various efforts have been put into ... [more ▼]

In this paper, we present to the community the first preliminary study on the security risks of Android TV apps. To the best of our knowledge, despite the fact that various efforts have been put into analyzing Android apps, our community has not explored TV versions of Android apps. There is hence no publicly available dataset containing Android TV apps. To this end, We start by collecting a large set of Android TV apps from the official Google Play store. We then experimentally look at those apps from four security aspects: VirusTotal scans, requested permissions, security flaws, and privacy leaks. Our experimental results reveal that, similar to that of Android smartphone apps, Android TV apps can also come with different security issues. We hence argue that our community should pay more attention to analyze Android TV apps. [less ▲]

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See detailGlobal land dampness characterization using reflectometry by students (GOLDCREST): mission and CubeSat design
Asadi, Niloofar; Gholami-Boroujeni, Farzaneh; Gogoi, Bishwajit et al

in Proceedings of the 12th European CubeSat symposium (2021, November 15)

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See detailCookie Banners, What’s the Purpose? Analyzing Cookie Banner Text Through a Legal Lens
Santos, Cristiana; Rossi, Arianna UL; Sanchez Chamorro, Lorena UL et al

in Proceedings of the 2021 ACM SIGSAC Conference on Computer and Communications Security (CCS '21) (2021, November 15)

A cookie banner pops up when a user visits a website for the first time, requesting consent to the use of cookies and other trackers for a variety of purposes. Unlike prior work that has focused on ... [more ▼]

A cookie banner pops up when a user visits a website for the first time, requesting consent to the use of cookies and other trackers for a variety of purposes. Unlike prior work that has focused on evaluating the user interface (UI) design of cookie banners, this paper presents an in-depth analysis of what cookie banners say to users to get their consent. We took an interdisciplinary approach to determining what cookie banners should say. Following the legal requirements of the ePrivacy Directive (ePD) and the General Data Protection Regulation (GDPR), we manually annotated around 400 cookie banners presented on the most popular English-speaking websites visited by users residing in the EU. We focused on analyzing the purposes of cookie banners and how these purposes were expressed (e.g., any misleading or vague language, any use of jargon). We found that 89% of cookie banners violated applicable laws. In particular, 61% of banners violated the purpose specificity requirement by mentioning vague purposes, including “user experience enhancement”. Further, 30% of banners used positive framing, breaching the freely given and informed consent requirements. Based on these findings, we provide recommendations that regulators can find useful. We also describe future research directions. [less ▲]

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See detailProceedings of the 12th European CubeSatSymposium
Thoemel, Jan UL; Querol, Jorge UL; Bokal, Zhanna UL et al

in Proceedings of the 12th European CubeSatSymposium (2021, November 15)

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See detailInclusion in Physical Education in primary schools in Europe through the lens of an Erasmus+ partnership
Marron, Susan; Murphy, Frances; Pitsia, Vasiliki et al

in Education 3-13 (2021)

Using data from the Disentangling Inclusion in Primary Physical Education (DIPPE) Erasmus+ project, this study aimed at investigating teachers’ practices related to inclusion of children with additional ... [more ▼]

Using data from the Disentangling Inclusion in Primary Physical Education (DIPPE) Erasmus+ project, this study aimed at investigating teachers’ practices related to inclusion of children with additional needs (AN) in primary physical education (PE) and identifying supports that could enhance these practices. Responses from 1170 primary teachers across nine European countries to an online questionnaire were analysed. Although inclusion was regarded as important, only 30% of children with AN were reported as being always included and engaged in PE. Teachers considered guidance on children’s motor needs and video-based resources particularly useful in promoting inclusion. Implications of the findings within the DIPPE project and more broadly are discussed. [less ▲]

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See detailImpact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2
Martin Lanzoni, Evandro UL; Ramirez Sanchez, Omar UL; Phirke, Himanshu UL et al

in Thin Solid Films (2021)

Alkali post-deposition treatments (PDTs) of Cu(In, Ga)Se2 (CIGSe) absorbers are known to improve the power conversion efficiency of the thin-film solar cell devices. The PDTs are usually carried out via ... [more ▼]

Alkali post-deposition treatments (PDTs) of Cu(In, Ga)Se2 (CIGSe) absorbers are known to improve the power conversion efficiency of the thin-film solar cell devices. The PDTs are usually carried out via evaporation of alkali fluorides in a selenium atmosphere onto a hot substrate. In this work, an alkali metal dispenser was used to evaporate pure metallic potassium onto epitaxial CIGSe absorbers. Subsequently, the absorber layers were heated in-situ to monitor chemical reactions and diffusion into the bulk. Due to the absence of grain boundaries, fluorine, and selenium, the effect of K on CIGSe absorber properties can be directly monitored. We find that potassium effectively diffuses into the bulk of epitaxial CIGSe absorber layers. The diffusion depends on the Cucontent of the CIGSe absorbers, in which Cu-depleted films present higher diffusion rates of K. Photoluminescence (PL) imaging corroborates that K in the bulk of the CIGSe absorber increases the PL yield, suggesting a passivation of defects or an increase in doping. This work highlights that alkali PDTs are not limited by interface and grain boundary modifications but also changes the absorber bulk properties, which needs to be taken into account. [less ▲]

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See detailLiewensgeschichten aus dem Minett
Harnoncourt, Julia UL

Diverse speeches and writings (2021)

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See detailZusammenarbeit der Luxemburger Universität mit der Derzhavin-Universität in Tambow, Russland
Ganschow, Inna UL

Speeches/Talks (2021)

The talk was focused on the academic activities around the international and interdisciplinary seminar at the University of Luxembourg "Russia and Luxembourg at the Crossroads of History"

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See detailAbout AI and Arts
Schommer, Christoph UL

Speeches/Talks (2021)

From a technical point of view, one can say that there have been extraordinary developments in the broad areas of Artificial Intelligence and Data Science that increasingly determine our lives. Think, for ... [more ▼]

From a technical point of view, one can say that there have been extraordinary developments in the broad areas of Artificial Intelligence and Data Science that increasingly determine our lives. Think, for example, of the many intelligent assistants that are playing an ever greater role in road traffic, in hospitals and in many other areas of application. Art is affected by this as well, because the computer-assisted and AI-supported implementation of creative ideas and thoughts and experimentation with new things have led to innovative results. [less ▲]

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See detailSowjetische Kriegsgefangene und Ostarbeiter_innen in Luxemburg 1942-1944
Ganschow, Inna UL

in Schroeder, Frank; Hoffmann, Elisabeth; Courtoy, Jérôme (Eds.) Luxemburg und das dritte Reich (2021)

The article provides an overview of the categories of forced workers from the USSR in Luxembourg during the Second World War. In particular, in addition to specific figures, selected biographies of both ... [more ▼]

The article provides an overview of the categories of forced workers from the USSR in Luxembourg during the Second World War. In particular, in addition to specific figures, selected biographies of both Soviet prisoners of war and civilian "Eastern workers" are given. The article treats their transportation from the Nazi-occupied Soviet territories, the life in a Luxembourger camp, living conditions, supply of clothes and shoes, food, working conditions and punishments. It also provides examples of the Luxembourg population sheltering prisoners who escaped from the camp. The article ends with a statistical summary of the penalties for collaboration, which were subjected to forced workers who returned to their Soviet homeland. [less ▲]

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See detailDie Zwangsrekrutierten in der sowjetischen Gefangenschaft
Ganschow, Inna UL

in Schroeder, Frank; Hoffmann, Elisabeth; Courtoy, Jérôme (Eds.) Luxemburg und das Dritte Reich (2021)

The article describes the difficulties of returning from Soviet captivity of the Luxembourgers who were drafted into the German Wehrmacht. On concrete examples, it is shown what was the path even of those ... [more ▼]

The article describes the difficulties of returning from Soviet captivity of the Luxembourgers who were drafted into the German Wehrmacht. On concrete examples, it is shown what was the path even of those young people into the German army who actively resisted the invaders and participated in the General Strike of 1942. The article also provides an overview of the possibilities in Soviet captivity for building survival mechanisms (learning the language, participating in the theater, writing poetry, songs and creating paintings). Based on ego documents, as well as on diplomatic correspondence between the Grand Duchy and the USSR, it is explained why the Luxembourgers were able to return to their homeland only in the fall of 1945, despite the fact that Luxembourg was already free from the fall of 1944. [less ▲]

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