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See detailParallel and distributed computing for stochastic dual dynamic programming
Avila, Daniel; Papavasiliou, Anthona; Löhndorf, Nils UL

in Computational Management Science (2021)

We study different parallelization schemes for the stochastic dual dynamic programming (SDDP) algorithm. We propose a taxonomy for these parallel algorithms, which is based on the concept of parallelizing ... [more ▼]

We study different parallelization schemes for the stochastic dual dynamic programming (SDDP) algorithm. We propose a taxonomy for these parallel algorithms, which is based on the concept of parallelizing by scenario and parallelizing by node of the underlying stochastic process. We develop a synchronous and asynchronous version for each configuration. The parallelization strategy in the parallelscenario configuration aims at parallelizing the Monte Carlo sampling procedure in the forward pass of the SDDP algorithm, and thus generates a large number of supporting hyperplanes in parallel. On the other hand, the parallel-node strategy aims at building a single hyperplane of the dynamic programming value function in parallel. The considered algorithms are implemented using Julia and JuMP on a high performance computing cluster. We study the effectiveness of the methods in terms of achieving tight optimality gaps, as well as the scalability properties of the algorithms with respect to an increasing number of CPUs. In particular, we study the effects of the different parallelization strategies on performance when increasing the number of Monte Carlo samples in the forward pass, and demonstrate through numerical experiments that such an increase may be harmful. Our results indicate that a parallel-node strategy presents certain benefits as compared to a parallel-scenario configuration. [less ▲]

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See detailBatch Learning in Stochastic Dual Dynamic Programming
Avila, Daniel; Papavasiliou, Anthona; Löhndorf, Nils UL

E-print/Working paper (2021)

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See detailRelated-Tweak Impossible Differential Cryptanalysis of Reduced-Round TweAES
Niu, Chao; Li, Muzhou; Wang, Meiqin et al

in Selected Areas in Cryptography - SAC 2021 - 24th International Conference, Ottawa, ON, Canada, September 29 - October 01, 2021, Revised Selected Papers (2021)

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See detailWhat does it cost to deploy an XAI system: A case study in legacy systems
Hoehn, Sviatlana UL; Faradouris, Niko

in Proceedings of EXTRAAMAS 2021 (2021)

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See detailBook review of : Alain Atten, D'Hobitz. Novell (Kanephora, 9), Luxembourg: Kremart Edition, 2020 ; 174 p.
Weis, Monique UL

in Hemecht: Zeitschrift für Luxemburger Geschichte (2021), 73(4), 509-510

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See detailSocial robotics and deception: beyond the ethical approach
Carli, Rachele UL

in Proceedings of BNAIC/BeneLearn 2021 (2021)

Social robots are designed to directly interact with users, to collaborate with them and to act in a human-centred environment, with different degrees of automation. In order to encourage acceptability ... [more ▼]

Social robots are designed to directly interact with users, to collaborate with them and to act in a human-centred environment, with different degrees of automation. In order to encourage acceptability and trust, they are structured as so to leverage the human tendency to anthropomorphise what they interact with. It follows that some machines are able to simulate the feeling of genuine emotions or empathy, to appear needy of help, to pretend to have an own rersonality and – more in general – to induce the user to think that they are something more than mere objects. Thus, it may be argued that such interaction could lead to forms of manipulation that fall within the remit of a deceptive dynamic. Such a phenomenon is still much debated by the scientific community and raises significant concerns regarding long-term ethical and psychological repercussions on the users. This paper investigates which tools we have and which ones we may need to tackle the theme of deception in social robotics. Therefore, both ethical and legal perspectives are reconstructed, with the attempt to try to distinguish their respective scope and to emphasise their fruitful in tegration in addressing these issues. Finally, the possible relevance of fundamental human rights in human-robot interaction dynamics is dis cussed, due to their ability to reconcile ethical demands with the binding feature of legal norms. [less ▲]

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See detailPredictors of Problematic Social Media Use in a Nationally Representative Sample of Adolescents in Luxembourg
van Duin, Claire UL; Heinz, Andreas UL; Willems, Helmut Erich UL

in International Journal of Environmental Research and Public Health (2021), 18(22),

Social media use has increased substantially over the past decades, especially among adolescents. A proportion of adolescents develop a pattern of problematic social media use (PSMU). Predictors of PSMU ... [more ▼]

Social media use has increased substantially over the past decades, especially among adolescents. A proportion of adolescents develop a pattern of problematic social media use (PSMU). Predictors of PSMU are insufficiently understood and researched. This study aims to investigate predictors of PSMU in a nationally representative sample of adolescents in Luxembourg. Data from the Health Behavior in School-aged Children (HBSC) study in Luxembourg were used, in which 8687 students aged 11–18 years old participated. The data were analyzed using hierarchical multiple regression. A range of sociodemographic, social support, well-being and media use predictors were added to the model in four blocks. The predictors in the final model explained 22.3% of the variance in PSMU. The block of sociodemographic predictors explained the lowest proportion of variance in PSMU compared with the other blocks. Age negatively predicted PSMU. Of the predictors related to social support, cyberbullying perpetration was the strongest predictor of PSMU. Perceived stress and psychosomatic complaints positively predicted PSMU. The intensity of electronic media communication and preference for online social interaction were stronger predictors of PSMU than the other predictors in the model. The results indicate that prevention efforts need to consider the diverse range of predictors related to PSMU. [less ▲]

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See detailExperiments in Causality and STIT
Streit, David D UL

in Proceedings of the First International Workshop on Logics for the New Generation Artificial Intelligence (2021)

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See detailReconstruction et reenactment. L'Histoire et la réanimation du passé
Fickers, Andreas UL

in Tore, Gian Maria; Colas-Blaise (Eds.) "RE-" Répétition et reproduction dans les arts et les médias (2021)

Since the beginning of historical writing, historians, philosophers and poets have reflected on the complex relationship between history and its linguistic representation, between the narrative and the ... [more ▼]

Since the beginning of historical writing, historians, philosophers and poets have reflected on the complex relationship between history and its linguistic representation, between the narrative and the reality expressed in it, between the textual formulation of the truth requirement and the stylistic or rhetorical work of persuasion. For centuries, and even for more than two millennia, this debate has always revolved around a major epistemological problem, summed up by the French historian Ivan Jablonka as follows: "How can truth be told in and through a text? The purpose of this small foray into historical theory is to reflect on the relationship between narrative, writing, interpretation and argumentation in historical writing, and in particular on the changes in these dimensions of historical thought and work over time, notably through the emergence of the 'modern ideal' of historical narrative in the nineteenth century. Next, I would like to briefly return to the complex relationship between historical reality and its representation in sources and media, and conclude with a more general reflection on the possibilities and challenges posed by digital representations of history. But first let us delve into the history of historical writing. [less ▲]

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See detailJurisdiktionsübergreifende Verwaltungsverfahren und gerichtliche Kontrolle
Hofmann, Herwig UL

in von Bogdandy, Armin; Huber, Peter (Eds.) Handbuch Ius Publicum (2021)

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See detailMagnetophotonics for sensing and magnetometry toward industrial applications
Rizal, Conrad; Manera, Maria Grazia; Ignatyeva, Daria O. et al

in Journal of Applied Physics (2021), 130

Magnetic nanostructures sustaining different types of optical modes have been used for magnetometry and label-free ultrasensitive refractive index probing, where the main challenge is the realization of ... [more ▼]

Magnetic nanostructures sustaining different types of optical modes have been used for magnetometry and label-free ultrasensitive refractive index probing, where the main challenge is the realization of compact devices that are able to transfer this technology from research laboratories to smart industry. This Perspective discusses the state-of-the-art and emerging trends in realizing innovative sensors containing new architectures and materials exploiting the unique ability to actively manipulate their optical properties using an externally applied magnetic field. In addition to the well-established use of propagating and localized plasmonic fields, in the so-called magnetoplasmonics, we identified a new potential of the all-dielectric platforms for sensing to overcome losses inherent to metallic components. In describing recent advances, emphasis is placed on several feasible industrial applications, trying to give our vision on the future of this promising field of research merging optics, magnetism, and nanotechnology. [less ▲]

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See detailUniversality and retroactivity in company law
Conac, Pierre-Henri UL

in Kusnetzov, Alexandr (Ed.) Российский акционерный закон: сборник статей к 25-летнему юбилею принятия (2021)

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See detailThe Breach of Union law procedure and the European Supervisory Agencies (ESAs) : an effective tool suffering from an expectation gap
Conac, Pierre-Henri UL

in The Future of Legal Europe: Will We Trust in It? Liber Amicorum in Honour of Wolfgang Heusel (2021)

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See detailSklaverei und Identitäten. Von der Antike bis zur Gegenwart
Binsfeld, Andrea UL; Ghetta, Marcello

Book published by Olms-Verlag (2021)

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See detailDominus and tyrannos? Narratives of slavery in the political discourse of Late Antiquity
Binsfeld, Andrea UL

Book published by EBVerlag (2021)

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See detailEinleitung
Binsfeld, Andrea UL

in Binsfeld, Andrea; Ghetta, Marcello (Eds.) Sklaverei und Identitäten. Von der Antike bis zur Gegenwart (2021)

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See detailLebens’wirklichkeiten‘ von Sklaven – Überlegungen zum Verhältnis von Gender, Macht und Status
Binsfeld, Andrea UL

in Binsfeld, Andrea; Ghetta, Marcello (Eds.) Sklaverei und Identitäten. Von der Antike bis zur Gegenwart (2021)

Detailed reference viewed: 11 (0 UL)