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See detailDe la "grande" à la "petite" histoire. Les chartes des souverains de la Maison de Luxembourg pour le convent de Marienthal
Pettiau, Hérold UL

Article for general public (2018)

This article aime at a general audience, presents three charters held in the National Archive in Luxembourg, in the Fonds Weimar. Commenting on several features, it provides a context to the writing of ... [more ▼]

This article aime at a general audience, presents three charters held in the National Archive in Luxembourg, in the Fonds Weimar. Commenting on several features, it provides a context to the writing of these three charters and illustrantes the involvement of high ranking aristocrate (indeed, sovereigns), in the affairs of a small convent. This article was written as part of a series of short pièces on the occasion of the XXth Journées Lotharingiennes, an international conference held from 24 to 26 October at the University of Luxembourg, on the topic "Re-reading the history of territorial principalities". [less ▲]

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See detailPrésences de souverains dans l'espace du "regnum Lotharii": Itinéraires, lieux de pouvoir et fidélités "Lotharingiennes" (869-936)
Pettiau, Hérold UL

in Pettiau, Hérold; Margue, Michel (Eds.) La Lotharingie en question. Identités, oppositions, intégration. LOtharingische Identitäten im Spannungsfeld zwischen integrativen und partikularen Kräften. Actes des 14es Journées Lotharingiennes (2018, October 25)

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See detailInterfacing counterculture and digital cultures: an interview with Geert Lovink
Schafer, Valerie UL

in Internet Histories: Digital Technology, Culture and Society (2018)

The famous Dutch media theorist and net activist Geert Lovink stood at the crossroads of several players and stages of cyberculture in the 90s, trying to assemble a disparate crowd of media activists and ... [more ▼]

The famous Dutch media theorist and net activist Geert Lovink stood at the crossroads of several players and stages of cyberculture in the 90s, trying to assemble a disparate crowd of media activists and media artists, programmers, designers, cultural producers and researchers. In this interview he looks back at his involvement in Mediamatic magazine from 1989 till 1994, the co-creation of the community access network De Digitale Stad Amsterdam,which started in 1994 as a freenet initiative in Amsterdam and the nettime email list in 1995. He also discusses the spirit of the 90s decade and the role of counter-cultural movements in the genesis and development of digital cultures. [less ▲]

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See detailForward Secrecy for SPAKE2
Lopez Becerra, José Miguel UL; Ostrev, Dimiter UL; Skrobot, Marjan

in Baek, Joonsang; Willy, Susilo (Eds.) Provable Security (2018, October 25)

Currently, the Simple Password-Based Encrypted Key Exchange (SPAKE2) protocol of Abdalla and Pointcheval (CT-RSA 2005) is being considered by the IETF for standardization and integration in TLS 1.3 ... [more ▼]

Currently, the Simple Password-Based Encrypted Key Exchange (SPAKE2) protocol of Abdalla and Pointcheval (CT-RSA 2005) is being considered by the IETF for standardization and integration in TLS 1.3. Although it has been proven secure in the Find-then-Guess model of Bellare, Pointcheval and Rogaway (EUROCRYPT 2000), whether it satisfies some notion of forward secrecy remains an open question. In this work, we prove that the SPAKE2 protocol satisfies the so-called weak forward secrecy introduced by Krawczyk (CRYPTO 2005). Furthermore, we demonstrate that the incorporation of key-confirmation codes in SPAKE2 results in a protocol that provably satisfies the stronger notion of perfect forward secrecy. As forward secrecy is an explicit requirement for cipher suites supported in the TLS handshake, we believe this work could fill the gap in the literature and facilitate the adoption of SPAKE2 in the recently approved TLS 1.3. [less ▲]

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See detailThemenabend "Tambow"
Ganschow, Inna UL

Conference given outside the academic context (2018)

Nach der Einführung findet ein Dokumentarfilm über das Gefangenenlager Tambow statt; eine erste Diskussion wird über die Manipulation von Quellen und die Rolle der audiovisuellen Quellen in der aktuellen ... [more ▼]

Nach der Einführung findet ein Dokumentarfilm über das Gefangenenlager Tambow statt; eine erste Diskussion wird über die Manipulation von Quellen und die Rolle der audiovisuellen Quellen in der aktuellen Historiographie führen. Anschließend, bieten wir Ihnen an eine Diskussion zu verfolgen zwischen einem Überlebenden des Gefangenenlagers Tambow, Herrn Jos Steichen und der Forscherin Inna Ganschow. [less ▲]

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See detailImplementing Transparency
Bunout, Estelle UL; During, Marten UL

Presentation (2018, October 25)

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See detailModel-based Reasoning in Science and Technology
Durlacher, Thomas UL

Presentation (2018, October 25)

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See detailConference report on the 45th German liquid crystal conference
Honaker, Lawrence William UL

in Liquid Crystals Today (2018), 27(3), 77-79

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See detailLink Optimization in Future Generation Satellite Systems
Mengali, Alberto UL

Doctoral thesis (2018)

In recent years, communication networks have seen a huge growth in the amount of requested throughput, pushed from the combination of two main drivers: the introduction of new services and the improvement ... [more ▼]

In recent years, communication networks have seen a huge growth in the amount of requested throughput, pushed from the combination of two main drivers: the introduction of new services and the improvement of existing ones, requiring increased amount of traffic (e.g. higher quality of video content). These effects mandate the constant evolution of current systems in order to cope with the growing user demand and should be tackled from multiple angles. On the one hand, better utilization of available resources might help in the short term to keep up with the market and has always been an important priority for operators of terrestrial and satellite networks alike. On the other hand, acquisition and exploitation of currently unused resources might fuel the growth for a significantly longer period of time, ensuring longevity and thus enabling future-proofing of current systems. Both these topics are addressed in this thesis with specific applications relevant to satellite communication networks. In the first part, this thesis focuses on maximization of the user capacity by better exploiting the available radio resources. Motivated by the substantial capacity gains enabled by a higher bandwidth allocation, we investigate the optimization of satellite systems employing full-frequency reuse on the user downlink. Unlike most of the literature on the subject, usually resorting to precoding techniques to mitigate the interference, we propose a combination of predistortion and precoding to jointly counteract on-board non-linear distortions and multi-user interference. First, a flexible framework for the optimization of transmit processing schemes in communication chains is presented. This framework expands on the application of the well known gradient descent technique by applying it to the maximization of the received Signal to Noise plus Interference ratio in complex communication systems. To do so, it identifies a suitable mathematical representation of various key blocks of the system and exploits the chain rule of the derivative to compute the overall gradient as a cascade of the single components. Afterwards, this framework is validated by optimizating the coefficients of the proposed predistortion architecture for the satellite system in analysis. The obtained results highlight the flexibility of the developed optimization framework and the benefits of the suggested predistortion strategy compared to existing state of the art solutions. In the second part of the thesis, the focus is shifted towards investigating the exploitation of novel resources by looking at the use of optical frequencies for ground-to-space feeder links. The topic is introduced by a survey of existing benefits and limitations of free space optical communications. Subsequently, the implications of employing optical frequencies in long distance ground-to-space feeder links with transparent satellites are addressed. Furthermore, a powerful and flexible simulation tool was developed and exploited during the course of this thesis to model and assess the Physical (PHY) layer performance of hybrid optical/Radio Frequencies (RF) satellite networks. This tool is presented together with the scenarios and results obtained as part of the project ONSET (Optical Feeder Links Study for Satellite Networks - ESA Contract No. 40000113462/15/NL/NDe). Finally, the thesis investigates a scenario that combines the transmit processing techniques analyzed in the first part and the context of optical feeder links evaluated in the second part. A hybrid optical/RF system is considered with an electrical predistorter in place to counteract the impairments induced by the combined effects of electrical and optical non-linearities encountered along the end-to-end chain. The developed mathematical framework is exploited to jointly optimize the predistortion coefficients and the working point for the electro-optical modulator. The performance results obtained after the optimization procedure demonstrate the efficacy of the proposed approach for hybrid optical/RF systems with analog modulations. [less ▲]

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See detailRanke2.uni.lu; an online multilingual teaching platform for lessons on digital source criticism
Scagliola, Stefania UL

Learning material (2018)

Ranke.2 is a teaching platform that offers lessons on how to critically assess and work with digital historical sources

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See detailGründerzeit à Dudelange - un nouveau regard sur l'histoire du Luxembourg
Scuto, Denis UL

Article for general public (2018)

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See detailGuideline-based and bioinformatic reassessment of lesion-associated gene and variant pathogenicity in focal human epilepsies
Niestroj, Lisa-Marie; Du, Juanjiangmeng; Nothnagel, Michael et al

in Epilepsia (2018)

Objective: Increasing availability of surgically resected brain tissue from patients with focal epilepsy and Focal Cortical Dysplasia (FCD) or low-grade glio-neuronal tumors has fostered large-scale ... [more ▼]

Objective: Increasing availability of surgically resected brain tissue from patients with focal epilepsy and Focal Cortical Dysplasia (FCD) or low-grade glio-neuronal tumors has fostered large-scale genetic examination. However, assessment of pathogenicity of germline and somatic variants remains difficult. Here, we present a state of the art evaluation of reported genes and variants associated with epileptic brain lesions. Methods: We critically re-evaluated the pathogenicity for all neuropathology-associated variants reported to date in PubMed and ClinVar databases including 101 neuropathology-associated missense variants encompassing 11 disease-related genes. We assessed gene variant tolerance and classified all identified missense variants according to guidelines from the American College of Medical Genetics and Genomics (ACMG). We further extended the bioinformatic variant prediction by introducing a novel gene-specific deleteriousness ranking for prediction scores. Results: Application of ACMG guidelines and in silico gene variant tolerance analysis classified only seven out of 11 genes to be likely disease-associated according to the reported a disease mechanism, while 61 (60.4%) of 101 variants of those genes were classified as of uncertain significance (VUS), 37 (36.6%) as being likely pathogenic (LP) and 3 (3%) as being pathogenic (P). Significance: We concluded that the majority of neuropathology-associated variants reported to date do not have enough evidence to be classified as pathogenic. Interpretation of lesion-associated variants remains challenging and application of current ACMG guidelines is recommended for interpretation and prediction. [less ▲]

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See detailHome Movie Day 2018: van smalfilm tot selfie
van der Heijden, Tim UL

Speeches/Talks (2018)

Home Movie Day at Eye Filmmuseum is an international tribute to the amateur film. This year, Home Movie Day highlights the history of amateur film which spans more than 100 years: from film strips to ... [more ▼]

Home Movie Day at Eye Filmmuseum is an international tribute to the amateur film. This year, Home Movie Day highlights the history of amateur film which spans more than 100 years: from film strips to selfies. How has the making and screening of amateur films and home movies changed in the past century? Who was filming? How and what did they film? And what role did the changing media landscape play? Eye celebrates the Home Movie Day on 20 October. The worldwide tribute to the amateur film has been organised every year since 2002, in countries such as the United States, Argentina and Japan. This edition, through the use of special objects and historical archive material, Home Movie Day zooms in on a number of drastic changes in amateur film. There was the rise of home video in the 1970s and 80s, and the transition from analogue to digital. The amateur and family filmer first filmed on a narrow film or Super8. After these transitions, there were plenty of new possibilities to capture daily life. On October 20 at 15.00 there is a lecture and presentation (90', in Dutch) in Eye in cooperation with Stichting Amateurfilm and the Netherlands Institute for Sound and Vision. The lecture will be held by Tim van der Heijden, media historian and board member of Stichting Amateurfilm. After the presentation, there is an opportunity to exchange information, ask questions and view the exhibited equipment. [less ▲]

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See detailErgebnisse der Zukunftswerkstatt im Rahmen des Praxis- und Kontakttages 2018
Flammang, Manou Laure UL

Article for general public (2018)

Im Rahmen des vom PraxisBüro der Universität Luxemburg organisierten Praxis- und Kontakttages 2018, haben ca. 300 Professionelle der Sozialen Arbeit an einer Zukunftswerkstatt mit dem Thema "Was sind die ... [more ▼]

Im Rahmen des vom PraxisBüro der Universität Luxemburg organisierten Praxis- und Kontakttages 2018, haben ca. 300 Professionelle der Sozialen Arbeit an einer Zukunftswerkstatt mit dem Thema "Was sind die Bedürfnisse der Akteure der Sozialen Arbeit?" teilgenommen. Die Ergebnisse wurden gesammelt und von der Autorin analysiert. Der Artikel beschreibt die Ergebnisse der Zukunftswerkstatt sowie ihre Bedeutung für die Soziale Arbeit in Luxemburg. [less ▲]

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See detailPrivacy-preserving Recommender Systems Facilitated By The Machine Learning Approach
Wang, Jun UL

Doctoral thesis (2018)

Recommender systems, which play a critical role in e-business services, are closely linked to our daily life. For example, companies such as Youtube and Amazon are always trying to secure their profit by ... [more ▼]

Recommender systems, which play a critical role in e-business services, are closely linked to our daily life. For example, companies such as Youtube and Amazon are always trying to secure their profit by estimating personalized user preferences and recommending the most relevant items (e.g., products, news, etc.) to each user from a large number of candidates. State-of-the-art recommender systems are often built on top of collaborative filtering techniques, of which the accuracy performance relies on precisely modeling user-item interactions by analyzing massive user historical data, such as browsing history, purchasing records, locations and so on. Generally, more data can lead to more accurate estimations and more commercial strategies, as such, service providers have incentives to collect and use more user data. On the one hand, recommender systems bring more income to service providers and more convenience to users; on the other hand, the user data can be abused, arising immediate privacy risks to the public. Therefore, how to preserve privacy while enjoying recommendation services becomes an increasingly important topic to both the research community and commercial practitioners. The privacy concerns can be disparate when constructing recommender systems or providing recommendation services under different scenarios. One scenario is that, a service provider wishes to protect its data privacy from the inference attack, a technique aims to infer more information (e.g., whether a record is in or not) about a database, by analyzing statistical outputs; the other scenario is that, multiple users agree to jointly perform a recommendation task, but none of them is willing to share their private data with any other users. Security primitives, such as homomorphic encryption, secure multiparty computation, and differential privacy, are immediate candidates to address privacy concerns. A typical approach to build efficient and accurate privacy-preserving solutions is to improve the security primitives, and then apply them to existing recommendation algorithms. However, this approach often yields a solution far from the satisfactory-of-practice, as most users have a low tolerance to the latency-increase or accuracy-drop, regarding recommendation services. The PhD program explores machine learning aided approaches to build efficient privacy-preserving solutions for recommender systems. The results of each proposed solution demonstrate that machine learning can be a strong assistant for privacy-preserving, rather than only a troublemaker. [less ▲]

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