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See detailToward a new model of collaborative problem solving definition and assessment
Stoeffler, K.; Greiff, Samuel UL; Von Davier, A. et al

Scientific Conference (2018, July)

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See detailSuccessive convex approximation algorithms for sparse signal estimation with nonconvex regularizations
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

in Proc. The 10th IEEE Sensor Array and Multichannel Signal Processing Workshop (2018, July)

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See detailTowards a multifaceted framework of complex problem solving
Stadler, Matthias UL; Niepel, Christoph UL; Greiff, Samuel UL

Scientific Conference (2018, July)

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See detailInnovations in computer-based assessment
Greiff, Samuel UL

Speeches/Talks (2018)

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See detailIntroducing MaFIN. A dynamic matrices finite state automata test
Kunze, Thiemo UL; Krieger, Florian UL; Stadler, Matthias UL et al

Scientific Conference (2018, July)

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See detailFundamentality and Time's Arrow
Loew, Christian UL

in Philosophy of Science (2018), 85(3), 483-500

The distribution of matter in our universe is strikingly time asymmetric. Most famously, the Second Law of Thermodynamics says that entropy tends to increase toward the future but not toward the past. But ... [more ▼]

The distribution of matter in our universe is strikingly time asymmetric. Most famously, the Second Law of Thermodynamics says that entropy tends to increase toward the future but not toward the past. But what explains this time-asymmetric distribution of matter? In this paper, I explore the idea that time itself has a direction by drawing from recent work on grounding and metaphysical fundamentality. I will argue that positing such a direction of time, in addition to time-asymmetric boundary conditions (such as the so-called "past hypothesis"), enables a better explanation of the thermodynamic asymmetry than is available otherwise. [less ▲]

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See detailDynamic controllers for column synchronization of rotation matrices: a QR-factorization approach
Thunberg, Johan UL; Markdahl, Johan UL; Goncalves, Jorge UL

in Automatica (2018), 93

In the multi-agent systems setting, this paper addresses continuous-time distributed synchronization of columns of rotation matrices. More precisely, k specific columns shall be synchronized and only the ... [more ▼]

In the multi-agent systems setting, this paper addresses continuous-time distributed synchronization of columns of rotation matrices. More precisely, k specific columns shall be synchronized and only the corresponding k columns of the relative rotations between the agents are assumed to be available for the control design. When one specific column is considered, the problem is equivalent to synchronization on the (d-1)-dimensional unit sphere and when all the columns are considered, the problem is equivalent to synchronization on SO(d). We design dynamic control laws for these synchronization problems. The control laws are based on the introduction of auxiliary variables in combination with a QR-factorization approach. The benefit of this QR-factorization approach is that we can decouple the dynamics for the $k$ columns from the remaining d-k ones. Under the control scheme, the closed loop system achieves almost global convergence to synchronization for quasi-strong interaction graph topologies. [less ▲]

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See detailCommunautés de vie et fiscalité individuelle au Grand-Duché de Luxembourg
Chaouche, Fatima UL

in Revue européenne et internationale de droit fiscal (2018), 2018/2

Luxembourg personal income tax system is far from being indifferent to family structures (marriage, civil union or cohabitation). For decades, the institution of marriage has been given preference over ... [more ▼]

Luxembourg personal income tax system is far from being indifferent to family structures (marriage, civil union or cohabitation). For decades, the institution of marriage has been given preference over any other forms of family by Luxembourg tax law. It was only in 2007 that the Luxembourg legislator recognized that, under restrictive conditions, civil unions may qualify for certain tax benefits. Almost a decade later, Luxembourg introduced optional individual taxation for married individuals in effect as of January 2018. Although some of these family structures may appear equivalent (marriage, civil unions), the application of the principle of equality before the law is ineffective to reach equal tax treatment for these communities as it is generally recognized that such institutions are not objectively comparable as recently confirmed by the Luxembourg Constitutional Court. Yet, various evolutions have taken place since the sixties including gender-equality-driven reforms. These recent developments provide an opportunity to question the maintenance of tax classes and envision, on the long run, a conceivable shift towards an individualization of taxation for all family structures. [less ▲]

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See detailGenerating Multi-Categorical Samples with Generative Adversarial Networks
Camino, Ramiro Daniel UL; Hammerschmidt, Christian UL; State, Radu UL

Scientific Conference (2018, July)

We propose a method to train generative adversarial networks on mutivariate feature vectors representing multiple categorical values. In contrast to the continuous domain, where GAN-based methods have ... [more ▼]

We propose a method to train generative adversarial networks on mutivariate feature vectors representing multiple categorical values. In contrast to the continuous domain, where GAN-based methods have delivered considerable results, GANs struggle to perform equally well on discrete data. We propose and compare several architectures based on multiple (Gumbel) softmax output layers taking into account the structure of the data. We evaluate the performance of our architecture on datasets with different sparsity, number of features, ranges of categorical values, and dependencies among the features. Our proposed architecture and method outperforms existing models. [less ▲]

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See detailTest Case Prioritization for Acceptance Testing of Cyber Physical Systems: A Multi-Objective Search-Based Approach
Shin, Seung Yeob UL; Nejati, Shiva UL; Sabetzadeh, Mehrdad UL et al

in Proceedings of the ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA'18) (2018, July)

Acceptance testing validates that a system meets its requirements and determines whether it can be sufficiently trusted and put into operation. For cyber physical systems (CPS), acceptance testing is a ... [more ▼]

Acceptance testing validates that a system meets its requirements and determines whether it can be sufficiently trusted and put into operation. For cyber physical systems (CPS), acceptance testing is a hardware-in-the-loop process conducted in a (near-)operational environment. Acceptance testing of a CPS often necessitates that the test cases be prioritized, as there are usually too many scenarios to consider given time constraints. CPS acceptance testing is further complicated by the uncertainty in the environment and the impact of testing on hardware. We propose an automated test case prioritization approach for CPS acceptance testing, accounting for time budget constraints, uncertainty, and hardware damage risks. Our approach is based on multi-objective search, combined with a test case minimization algorithm that eliminates redundant operations from an ordered sequence of test cases. We evaluate our approach on a representative case study from the satellite domain. The results indicate that, compared to test cases that are prioritized manually by satellite engineers, our automated approach more than doubles the number of test cases that fit into a given time frame, while reducing to less than one third the number of operations that entail the risk of damage to key hardware components. [less ▲]

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See detailPeut-on se moquer de tout ? L'étendue de la liberté d'expression face au sentiment religieux
Gerkrath, Jörg UL

in Institut Grand Ducal (Ed.) Actes de la Section des sciences morales et politiques (2018, July)

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See detailReduced modulatory effects of distraction on pain due to aging
Siquier, A; Prats, MA; Montoya, P et al

Scientific Conference (2018, July)

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See detail23. Konferenz der IGEB 19. bis 24. Juli 2018, Wadgassen, Deutschland. Neue Technologien und Innovationen in der Blasmusikforschung und –ausbildung.
Sagrillo, Damien UL

Book published by Kliment - Konferenzbuch / Conference Guide 2018 (2018)

The present compilation of abstracts and biographies contains all texts received before June 15th, 2018. The translations have been provided by each author. Texts and translations are the sole ... [more ▼]

The present compilation of abstracts and biographies contains all texts received before June 15th, 2018. The translations have been provided by each author. Texts and translations are the sole responsibility of the authors and not of the editors. Automated translations have been removed. We ask for your understanding [less ▲]

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See detail"Rien n'est possible sans les hommes, rien n'est durable sans les institutions"
Danescu, Elena UL

Article for general public (2018)

Le 19 juin 1983, au Conseil européen de Stuttgart, le Premier Ministre, Pierre Werner, signe la Déclaration solennelle sur l'Union européenne. Ce document programmatique affirme la nécessité de « ... [more ▼]

Le 19 juin 1983, au Conseil européen de Stuttgart, le Premier Ministre, Pierre Werner, signe la Déclaration solennelle sur l'Union européenne. Ce document programmatique affirme la nécessité de « progresser vers une union toujours plus étroite entre les peuples et les États membres » et considère l’amélioration des institutions communautaires et la coopération politique comme clé de voûte pour plus d’Europe. Trente-cinq ans plus tard, ces desiderata trouvent un ample écho dans l’actualité. [less ▲]

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See detailHow unemployment scarring affects skilled young workers: evidence from a factorial survey of Swiss recruiters
Shi, Lulu P.; Imdorf, Christian; Samuel, Robin UL et al

in Journal for Labour Market Research = Zeitschrift für Arbeitsmarktforschung (2018), 52(7),

We ask how employers contribute to unemployment scarring in the recruitment process in the German-speaking part of Switzerland. By drawing on recruitment theories, we aim to better understand how ... [more ▼]

We ask how employers contribute to unemployment scarring in the recruitment process in the German-speaking part of Switzerland. By drawing on recruitment theories, we aim to better understand how recruiters assess different patterns of unemployment in a job candidate’s CV and how this affects the chances of young applicants being considered for a vacancy. We argue that in contexts with tight school-work linkage and highly standardised Vocational Education and Training (VET) systems, the detrimental effect of early unemployment depends on how well the applicant’s profile matches the requirements of the advertised position. To test this assumption, we surveyed Swiss recruiters who were seeking to fill positions during the time of data collection. We employed a factorial survey experiment that tested how the (un)employment trajectories in hypothetical young job applicants’ CVs affected their chances of being considered for a real vacancy. Our results show that unemployment decreases the perceived suitability of an applicant for a specific job, which implies there is a scarring effect of unemployment that increases with the duration of being unemployed. But we also found that these effects are moderated by how well the applicant’s profile matches the job’s requirements. Overall, the worse the match between applicant’s profile and the job profile, the smaller are the scarring effects of unemployment. In sum, our findings contribute to the literature by revealing considerable heterogeneity in the scarring effects of unemployment. Our findings further suggest that the scarring effects of unemployment need to be studied with regard to country-specific institutional settings, the applicants’ previous education and employment experiences, and the job characteristics. [less ▲]

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