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See detailJoint Scheduling and Precoding for Frame-Based Multigroup Multicasting in Satellite Communications
Bandi, Ashok UL; Shankar, Bhavani UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, December 09)

Recent satellite standards enforce the coding of multiple users’ data in a frame. This transmission strategy mimics the well-known physical layer multigroup multicasting (MGMC). However, typical beam ... [more ▼]

Recent satellite standards enforce the coding of multiple users’ data in a frame. This transmission strategy mimics the well-known physical layer multigroup multicasting (MGMC). However, typical beam coverage with a large number of users and limited frame length lead to the scheduling of only a few users. Moreover, in emerging aggressive frequency reuse systems, scheduling is coupled with precoding. This is addressed in this work, through the joint design of scheduling and precoding for frame-based MGMC satellite systems. This aim is formulated as the maximization of the sum-rate under per beam power constraint and minimum SINR requirement of scheduled users. Further, a framework is proposed to transform the non-smooth SR objective with integer scheduling and nonconvex SINR constraints as a difference-of-convex problem that facilitates the joint update of scheduling and precoding. Therein, an efficient convex-concave procedure based algorithm is proposed. Finally, the gains (up to 50%) obtained by the jointed design over state-of-the-art methods is shown through Monte-Carlo simulations. [less ▲]

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See detailPromoting multilingualism and multiliteracies through storytelling: a casestudy on the use of the app iTEO in preschools in Luxembourg
Kirsch, Claudine UL

in Breuer, Ester; Lindgren, Eva; Stavans, anat (Eds.) et al Multilingual Literacy (2019)

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See detailChallenges in completing EMU: asymmetric competition vs fiscal harmonisation. A case study of the Benelux countries
Danescu, Elena UL

in Journal of Contemporary European Research [=JCER] (2019)

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative ... [more ▼]

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative factors at work via a case study of the Benelux countries – both founder members of the EU and pioneers of EMU – and to examine the impact on European and international regulations in the field. In particular, it will endeavour to provide a comprehensive interpretation of fiscal policy in the Benelux countries via a comparative approach and from a historical perspective. It will look at the development of respective domestic fiscal policies, driven by national interests and by membership of a Community that is subject to requirements in terms of harmonisation and taxation, but also by constant contact (and frequent clashes) with the multilateral international environment. [less ▲]

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See detailDialog, Monolog, Hybrid - Mehrsprachige Theatertexte in Luxemburg
Bloch, Natalie UL

Presentation (2019, November)

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

Scientific Conference (2019, October 19)

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. Also, we demonstrate our approach to successfully improve the recognition of handwritten digits using conditional generative adversarial networks (cGAN). Finally, we shortly discuss selected important issues of our process, presenting related work and proposing some improvements. [less ▲]

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See detailMonitoring du système scolaire – Le modèle luxembourgeois (invited talk)
Fischbach, Antoine UL

Scientific Conference (2019, October 17)

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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 detailRemixed und reloaded: Der Chor und das (neue) Volkstheater
Bloch, Natalie UL; Tropper, Elisabeth UL

Presentation (2019, October)

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See detailWireless Multi-group Multicast Precoding with Selective RF Energy Harvesting
Gautam, Sumit UL; Lagunas, Eva UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, September 05)

We present a novel framework for multi-group multicast precoding in the presence of three types of wireless users which are distributed among various multicast groups. A multi-antenna transmitter conveys ... [more ▼]

We present a novel framework for multi-group multicast precoding in the presence of three types of wireless users which are distributed among various multicast groups. A multi-antenna transmitter conveys information and/or energy to the groups of corresponding receivers using more than one multicast streams. The information specific users have conventional receiver architectures to process data, energy harvesting users collect energy using the non-linear energy harvesting module and each of the joint information decoding and energy harvesting capable user is assumed to employ the separated architecture with disparate non-linear energy harvesting and conventional information decoding units. In this context, we formulate and analyze the problem of total transmit power minimization for optimal precoder design subjected to minimum signal-to-interference-and-noise ratio and harvested energy demands at the respective users under three different scenarios. This problem is solved via semi-definite relaxation and the advantages of employing separate information and energy precoders are shown over joint and per-user information and energy precoder designs. Simulation results illustrate the benefits of proposed framework under several operating conditions and parameter values. [less ▲]

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See detailThe Latent Topic Block Model for the Co-Clustering of Textual Interaction Data
Berge, Laurent UL; Bouveyron, Charles; Corneli, Marco et al

in Computational Statistics and Data Analysis (2019), 137

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See detailTime-Deconvolutive CNMF for Multichannel Blind Source Separation
Dias, Thadeu; Biscainho, Luiz Wagner; Alves Martins, Wallace UL

in Anais do XXXVII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT 2019) (2019, September)

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See detailValue-added models: To what extent do estimates of school effectiveness depend on the selection of covariates?
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, September)

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See detailOn indefinite sums weighted by periodic sequences
Marichal, Jean-Luc UL

in Results in Mathematics (2019), 74(3), 95

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0 ... [more ▼]

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0}$, where $p\in\{0,\ldots,q-1\}$. When explicit expressions for the latter sums are available, this formula immediately provides explicit expressions for the former sums. We also illustrate this formula through some examples. [less ▲]

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See detailIntersymbol and Intercarrier Interference in OFDM Transmissions Through Highly Dispersive Channels
Alves Martins, Wallace UL; Cruz-Roldán, Fernando; Moonen, Marc et al

in Proc. of the 27th European Signal Processing Conference (EUSIPCO-2019) (2019, September)

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See detailOn the Use of Vertex-Frequency Analysis for Anomaly Detection in Graph Signals
Lewenfus, Gabriela; Alves Martins, Wallace UL; Chatzinotas, Symeon UL et al

in Anais do XXXVII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT 2019) (2019, September)

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See detailFear and Euphoria
Lehnert, Thorsten UL

Scientific Conference (2019, August 28)

Detailed reference viewed: 57 (3 UL)
See detailBelgien und Deutschland: eine kleine Beziehungsgeschichte
Brüll, Christoph UL

E-print/Working paper (2019)

Detailed reference viewed: 38 (2 UL)
See detailDie Entwicklung der Entfremdung vom Lernen in der unteren Sekundarstufe in Luxemburg: Der Beitrag differenzieller schulischer Lern- und Entwicklungsmilieus
Grecu, Alyssa Laureen UL

Doctoral thesis (2019)

This dissertation provides research on alienation from learning in differential learning and developmental milieus (vgl. Baumert/Stanat/Watermann 2006) within the strongly stratified educational system of ... [more ▼]

This dissertation provides research on alienation from learning in differential learning and developmental milieus (vgl. Baumert/Stanat/Watermann 2006) within the strongly stratified educational system of Luxembourg. Alienation from learning is defined as a student´s generalised negative orientation towards learning (Hascher/Hadjar 2018, S. 179) and collocates with severe consequences including school dropout (see Hascher/Hagenauer 2010, S. 220). The study focusses on the question of how the development of alienation from learning differs between the differential learning and developmental milieus within Luxembourgish secondary school tracks. The conceptual framework is based on the perspective of differential learning and developmental milieus (Baumert/Stanat/Watermann 2006), the theory of school culture (Helsper 2008; Kramer/Thiersch/Ziems 2015) and further culture sociological and resonance pedagogical approaches (Willis 1978; Beljan 2017). Combining research on school culture and research on school alienation, this works examines the interplay between school culture and individual students and its impact on alienation from learning. Conceptualized as a mixed method study, this research aims for a holistic picture on alienation from learning by combining quantitative and qualitative approaches. The quantitative part is based on a three-year panel study with students from all secondary school tracks (grade 7-9). Employing random effects models and growth curves models it investigated the degree and development of alienation from learning over time. Qualitative group discussions and interviews with classes (grade 7) and their teachers from the high-achieving and low-achieving school track (corresponding to grammar school and the lowest secondary school track) were conducted to research how schools´ specific demands contribute to alienation from learning. The method employed in the qualitative analysis was the sequence-analytical habitus reconstruction approach. Quantitative analysis reveals a moderate but increasing degree of alienation from learning in all secondary school tracks from grade 7 to 9. Therefore, alienation from learning develops similarly in all secondary school tracks. Students from the high-achieving ES-Track show the strongest degree of alienation from learning whereas students from the low-achieving Modulaire-Track show the lowest degree of alienation from learning. Qualitative analysis identifies the high-achieving and low-achieving secondary school tracks as differential learning and developmental milieus characterized by diverging educational demands and standards on the class level. Consequently, when students’ orientations conflict with the school´s demands and offers there is a high risk for them to develop alienation. Track-specific possibilities and risks were identified with regard to bonding and alienation. Strong achievement orientation, theoretical educational content and highly standardised educational settings may foster alienation from learning depending on the students´ individual competencies and orientations. [less ▲]

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See detailDimensional Comparison Effects on Facets of Subject-Specific Anxieties: A Nested Modelling Approach
Talic, Irma UL; Sparfeldt, Jörn; Möller, Jens et al

Scientific Conference (2019, August 16)

Detailed reference viewed: 23 (0 UL)