References of "2020"
     in
Bookmark and Share    
Full Text
See detailA newform theory for Katz modular forms
Mamo, Daniel Berhanu UL

Doctoral thesis (2020)

In this thesis, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old ... [more ▼]

In this thesis, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old space of a uniquely associated Katz newform. We also set up multiplicity one results for Katz eigenforms which have reducible Galois representation. [less ▲]

Detailed reference viewed: 99 (6 UL)
See detailNew Legal Aspects of the NISD Review
Schmitz, Sandra UL

Presentation (2020, December 02)

Detailed reference viewed: 43 (1 UL)
Full Text
See detailIntroduction : les Cahiers de la Grande Région - Quelles équations à résoudre pour le marché du travail transfrontalier (n°2) et la formation dans la Grande Région Réalités et défis (n°3)
Pigeron-Piroth, Isabelle UL

Conference given outside the academic context (2020)

A l’occasion de la publication de la troisième édition de la série Cahiers de la Grande Région, la Fondation IDEA asbl et le réseau Center for Border Studies de l’Université de la Grande Région (UniGR-CBS ... [more ▼]

A l’occasion de la publication de la troisième édition de la série Cahiers de la Grande Région, la Fondation IDEA asbl et le réseau Center for Border Studies de l’Université de la Grande Région (UniGR-CBS), en partenariat avec les membres de l’initiative des Cahiers de la Grande Région ont le plaisir de vous inviter à participer à la prochaine conférence-débat qui portera sur le thème: Inadéquations, compétences, formation… Quelles équations pour le marché du travail transfrontalier ? Eléments de réflexion à partir des Cahiers de la Grande Région #2 et #3 [less ▲]

Detailed reference viewed: 22 (0 UL)
Full Text
Peer Reviewed
See detailEnergy-aware scheduling of malleable HPC applications using a Particle Swarm optimised greedy algorithm.
Mejri, Nesryne UL; Dupont, Briag Gerard Benjamin UL; Da Costa, Georges

in Sustainable Computing: Informatics and Systems (2020)

The scheduling of parallel tasks is a topic that has received a lot of attention in recent years, in particular, due to the development of larger HPC clusters. It is regarded as an interesting problem ... [more ▼]

The scheduling of parallel tasks is a topic that has received a lot of attention in recent years, in particular, due to the development of larger HPC clusters. It is regarded as an interesting problem because when combined with performant hardware, it ensures fast and efficient computing. However, it comes with a cost. The growing number of HPC clusters entails a greater global energy consumption which has a clear negative environmental impact. A green solution is thus required to find a compromise between energy-saving and high-performance computing within those clusters. In this paper, we evaluate the use of malleable jobs and idle servers powering off as a way to reduce both jobs mean stretch time and servers average power consumption. Malleable jobs have the particularity that the number of allocated servers can be changed during runtime. We present an energy-aware greedy algorithm with Particle Swarm Optimised parameters as a possible solution to schedule malleable jobs. An in-depth evaluation of the approach is then outlined using results from a simulator that was developed to handle malleable jobs. The results show that the use of malleable tasks can lead to an improved performance in terms of power consumption. We believe that our results open the door for further investigations on using malleable jobs models coupled with the energy-saving aspect. [less ▲]

Detailed reference viewed: 32 (5 UL)
See detailIntegrated likelihood based inference for nonlinear panel data models with unobserved effects
Schumann, Martin; Severini, Thomas A.; Tripathi, Gautam UL

Presentation (2020, December 01)

Detailed reference viewed: 50 (0 UL)
Full Text
Peer Reviewed
See detailFootball activism as political contention: Contextual determinants of membership in the association of supporters of Hajduk Split
Glaurdic, Josip UL

in International Review for the Sociology of Sport (2020), 55(8), 1094-1115

Where do politically activist football supporters come from? What are the social conditions under which they are successfully recruited and mobilised? This article answers those questions by analysing a ... [more ▼]

Where do politically activist football supporters come from? What are the social conditions under which they are successfully recruited and mobilised? This article answers those questions by analysing a unique dataset of more than 43,000 members of Our Hajduk – the association of supporters of the Croatian club Hajduk Split – as well as a host of data on the communities they live in. The analysis shows that Our Hajduk thrives in exactly the same areas where most other social, civil and political organisations thrive: among the more educated and more socioeconomically successful. Most importantly, the analysis shows that the pattern of Our Hajduk membership closely follows the patterns of political affiliation and participation in Croatia’s electoral arena and is guided by the opposition to political players who have dominated Croatian football and turned it into a social field marked by corruption and mismanagement. [less ▲]

Detailed reference viewed: 92 (6 UL)
Full Text
See detailCommon pool resource management and risk perceptions
Mavi, Can Askan UL; Quérou, Nicolas

E-print/Working paper (2020)

Motivated by recent discussions about the issue of risk perceptions for climate change related events, we introduce a non-cooperative game setting where agents manage a common pool resource under a ... [more ▼]

Motivated by recent discussions about the issue of risk perceptions for climate change related events, we introduce a non-cooperative game setting where agents manage a common pool resource under a potential risk, and agents exhibit different risk perception biases. Focusing on the effect of the polarization level and other population features, we show that the type of bias (overestimation versus underestimation biases) and the resource quality level before and after the occurrence of the shift have first-order importance on the qualitative nature of behavioral adjustments and on the pattern of resource conservation. When there are non-uniform biases within the population, the intra-group structure of the population qualitatively affects the degree of resource conservation. Moreover, unbiased agents may react in nonmonotone ways to changes in the polarization level when faced with agents exhibiting different types of bias. The size of the unbiased agents’ sub-population does not qualitatively affect how an increase in the polarization level impacts individual behavioral adjustments, even though it affects the magnitude of this change. Finally, it is shown how perception biases affect the comparison between centralized and decentralized management. [less ▲]

Detailed reference viewed: 59 (0 UL)
Full Text
Peer Reviewed
See detailLuxembourger in the USSR: Tambow in Wort und Schrift. Zur logotherapeutischen Funktion von Ego-Dokumenten und Lagerliteratur der Zwangsrekrutierten in sowjetischer Gefangenschaft
Ganschow, Inna UL

Article for general public (2020)

Luxembourg camp literature has its literary roots in the literature of prisoners of war and prisoners of war of the First World War. During their Soviet imprisonment from 1943 to 1953, the Luxembourg ... [more ▼]

Luxembourg camp literature has its literary roots in the literature of prisoners of war and prisoners of war of the First World War. During their Soviet imprisonment from 1943 to 1953, the Luxembourg conscripts continued a tradition of documentarism that did not want to create fictional narrative worlds, but instead focused exclusively on what they had experienced themselves. A large part of the texts left behind is also not literature that was written for a larger audience. They have often been published by the authors themselves. Autobiographies, memoirs and a few volumes of poetry (Faber, Bausch, Schauss) were published, some decades later. A fictional play by the former prisoner of war Joseph Schmit has not been printed to this day. Numerous ego documents, as the research of contemporary history calls them today, have also been preserved - private, handwritten texts of a personal nature. Such material will be the primary focus of this paper. The range of Luxembourgish texts to be examined from the Soviet camp ranges from smuggled notes and letters that released comrades brought to Luxembourg, through diaries, speeches and self-made dictionaries to poems and stories, some of which were in the camp and some immediately after their return Tambov and other Soviet camps emerged. [less ▲]

Detailed reference viewed: 27 (3 UL)
Full Text
Peer Reviewed
See detailChanges in school alienation profiles among secondary school students and the role of teaching style: Results from a longitudinal study in Luxembourg and Switzerland
Hadjar, Andreas UL; Grecu, Alyssa; Scharf, Jan et al

in International Journal of Educational Research (2020), early online

What students think about school has a major impact on learning and academic achievement. The multi-domain concept of school alienation distinguishes between alienation from learning, from teachers and ... [more ▼]

What students think about school has a major impact on learning and academic achievement. The multi-domain concept of school alienation distinguishes between alienation from learning, from teachers and from classmates. We aim to study a) alienation patterns among secondary school students, b) how school alienation profiles change from year 7 to year 9 and how secondary school students transition between profiles, and c) the role of teaching style for transitions between school alienation profiles. We draw on panel data of secondary school students from Luxembourg and Switzerland. Results of latent profile/latent transition analyses reveal distinct school alienation profiles, country differences and support for the idea that student-oriented, supportive teaching styles might prevent students from transitioning towards more-highly alienated profiles. [less ▲]

Detailed reference viewed: 113 (3 UL)
Full Text
Peer Reviewed
See detailLe travail de parole avec les enseignants: un rempart face aux nouvelles formes de fatigue subjective
Weber, Jean-Marie UL; Pirone, Ilaria

in Psicanalise e Educacao (2020), 29

Detailed reference viewed: 67 (2 UL)
See detailLecture notes on Algebraic Geometry
Kalugin, Alexey UL

Learning material (2020)

Lecture notes for the course given by the author at the University of Luxembourg during the winter term 2020.

Detailed reference viewed: 43 (3 UL)
Full Text
Peer Reviewed
See detailFrontières liquides : l’eau dans les romans de la terre au Luxembourg
Thiltges, Sébastian UL

in Thiltges, Sébastian; Solte-Gresser, Christiane (Eds.) Ecologie culturelle et cultures écologiques dans la Grande Région (2020, December)

While the earth usually represents the element in which cultural attachment is rooted, water on the contrary reveals what exceeds or interpenetrates the land. The liquid element is as ambiguous as it is ... [more ▼]

While the earth usually represents the element in which cultural attachment is rooted, water on the contrary reveals what exceeds or interpenetrates the land. The liquid element is as ambiguous as it is proteiform: vital and destructive at the same time, it sometimes is a figure of liberation, sometimes of tragic dissolution. In a corpus of Luxembourgish novels from the early 20th century, this paper will analyse the depictions of water, mostly in its opposition with the soil, in order to question the meaning of the liquid element in a context where, corollary to social, economic and political changes, the earth is generally dominant in discourse and imagination. If nature has mostly been confined to the local and cultural landscape, an eco-material reading highlights on the contrary a global and crossborder dimension inherent to nature, but also to culture, disregarding the map-drawn boundaries that define the individual and the collective. Finally, a sensitive, anthropoetical reading also challenges historical, contextual and fictional frames. The materiality of the liquid element is not just a metaphor: it shapes natural, as well as textual environments. [less ▲]

Detailed reference viewed: 24 (1 UL)
Full Text
See detailPrésences et déplacements des souverains de la Francie médiane de 843 à 869: Contribution à l'étude de l'espace politique de Lothaire Ier et Lothaire II
Pettiau, Hérold UL

in Pettinger, Maxime (Ed.) D'un regnum à l'autre. La Lotharingie, un espace de l'entre-deux? Von Regnum hum Imperium. Lotharingien als Zwischenreich? (2020, December)

This contribution is devoted to the analysis of the movements made by Emperor Lothar I and his son, King Lothar II, by proposing to distinguish between three types of movement: movements at the beginning ... [more ▼]

This contribution is devoted to the analysis of the movements made by Emperor Lothar I and his son, King Lothar II, by proposing to distinguish between three types of movement: movements at the beginning of the reign, "usual" movements during the reign and movements that would be described as "punctual", of a pendular type. The importance and nature of multilateral meetings between sovereigns is taken into account. This comparison highlights a certain permanence in the use of a stable palatial zone by the two sovereigns, between the Meuse and Eifel on the one hand and a Moselle axis from Thionville to Remiremont on the other, but also, beyond the variety of contexts, similarities in the more exceptional movements, which remain largely concentrated in the Francia media area, a part that fell to Lothaire after the Treaty of Verdun. [less ▲]

Detailed reference viewed: 31 (2 UL)
Full Text
Peer Reviewed
See detailA comparison of constitutive models for describing the flow of uncured styrene-butadiene rubber
Rehor, Martin UL; Gansen, Alex UL; Sill, Clemens et al

in Journal of Non-Newtonian Fluid Mechanics (2020), 286

Uncured styrene-butadiene rubber (SBR) can be modelled as a viscoelastic material with at least two different relaxation mechanisms. In this paper we compare multi-mode constitutive models combining two ... [more ▼]

Uncured styrene-butadiene rubber (SBR) can be modelled as a viscoelastic material with at least two different relaxation mechanisms. In this paper we compare multi-mode constitutive models combining two viscoelastic modes (linear and/or nonlinear) in three possible ways. Our particular choice of the two modes was inspired by models originally developed to describe the response of asphalt binders. We select the model that best fits the experimental data obtained from a modified stress relaxation experiment in the torsional configuration of the plate-plate rheometer. The optimisation of the five model parameters for each model is achieved by minimising the weighted least-squares distance between experimental observations and the computer model output using a tree-structured Parzen estimator algorithm to find an initial guess, followed by further optimisation using the Nelder-Mead simplex algorithm. The results show that the model combining the linear mode and the nonlinear mode is the most suitable variant to describe the observed behavior of SBR in the given regime. The predictive capabilities of the three models are further examined in changed experimental and numerical configurations. Full data and code to produce the figures in this article are included as supplementary material. [less ▲]

Detailed reference viewed: 223 (21 UL)
Full Text
Peer Reviewed
See detailPrivacy-Preserving Logistic Regression as a Cloud Service Based on Residue Number System
Cortés-Mendoza, Jorge; Tchernykh, Andrei; Babenko, Mikhail et al

in Voevodin, Vladimir; Sobolev, Sergey (Eds.) 6th Russian Supercomputing Days, Moscow 21-22 September 2020 (2020, December)

Detailed reference viewed: 82 (0 UL)
Full Text
See detailA hybrid MGA-MSGD ANN training approach for approximate solution of linear elliptic PDEs
Dehghani, Hamidreza UL; Zilian, Andreas UL

E-print/Working paper (2020)

We introduce a hybrid "Modified Genetic Algorithm-Multilevel Stochastic Gradient Descent" (MGA-MSGD) training algorithm that considerably improves accuracy and efficiency of solving 3D mechanical problems ... [more ▼]

We introduce a hybrid "Modified Genetic Algorithm-Multilevel Stochastic Gradient Descent" (MGA-MSGD) training algorithm that considerably improves accuracy and efficiency of solving 3D mechanical problems described, in strong-form, by PDEs via ANNs (Artificial Neural Networks). This presented approach allows the selection of a number of locations of interest at which the state variables are expected to fulfil the governing equations associated with a physical problem. Unlike classical PDE approximation methods such as finite differences or the finite element method, there is no need to establish and reconstruct the physical field quantity throughout the computational domain in order to predict the mechanical response at specific locations of interest. The basic idea of MGA-MSGD is the manipulation of the learnable parameters’ components responsible for the error explosion so that we can train the network with relatively larger learning rates which avoids trapping in local minima. The proposed training approach is less sensitive to the learning rate value, training points density and distribution, and the random initial parameters. The distance function to minimise is where we introduce the PDEs including any physical laws and conditions (so-called, Physics Informed ANN). The Genetic algorithm is modified to be suitable for this type of ANN in which a Coarse-level Stochastic Gradient Descent (CSGD) is exploited to make the decision of the offspring qualification. Employing the presented approach, a considerable improvement in both accuracy and efficiency, compared with standard training algorithms such classical SGD and Adam optimiser, is observed. The local displacement accuracy is studied and ensured by introducing the results of Finite Element Method (FEM) at sufficiently fine mesh as the reference displacements. A slightly more complex problem is solved ensuring the feasibility of the methodology [less ▲]

Detailed reference viewed: 66 (1 UL)
See detailManaging residence permits and unemployment of third-country nationals during the COVID-19 crisis in the EU
Sommarribas, Adolfo UL

in Journaal Vreemdelingenrecht (2020), 19(4), 14-21

This article will try to provide a state of play of the response of the EU Member States to the COVID-19 crisis in regard to third-country nationals through the information compiled by the European ... [more ▼]

This article will try to provide a state of play of the response of the EU Member States to the COVID-19 crisis in regard to third-country nationals through the information compiled by the European Migration Network between 3 February until 15 June 2020. It will draw a state of play of the actions taken by Member States to confront the spread of the coronavirus in the immigration context. It also will focus on the validity of residence permits and the dispositions taken to avoid that legal migrants fall in an irregular situation and the effects of unemployment in regard to their residence permits. However, the article will not draw a timeline on when the actions were taken. [less ▲]

Detailed reference viewed: 40 (3 UL)
Full Text
Peer Reviewed
See detailDouble-Graded Quantum Superplane
Bruce, Andrew UL; Duplij, Steven

in Reports on Mathematical Physics (2020), 86(3), 383-400

A ℤ2 × ℤ2-graded generalisation of the quantum superplane is proposed and studied. We construct a bicovariant calculus on what we shall refer to as the double-graded quantum superplane. The ommutation ... [more ▼]

A ℤ2 × ℤ2-graded generalisation of the quantum superplane is proposed and studied. We construct a bicovariant calculus on what we shall refer to as the double-graded quantum superplane. The ommutation rules between the coordinates, their differentials and partial derivatives are explicitly given. Furthermore, we show that an extended version of the double-graded quantum superplane admits a natural Hopf -algebra structure. [less ▲]

Detailed reference viewed: 12 (1 UL)