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See detailAlgorithmic Decision Making with Python Resources: From multicriteria performance records to decision algorithms via bipolar-valued outranking digraphs
Bisdorff, Raymond UL

Book published by Springer (in press)

This book describes Python3 programming resources for implementing decision aiding algorithms in the context of a bipolar-valued outranking approach. These computing resources, made available under the ... [more ▼]

This book describes Python3 programming resources for implementing decision aiding algorithms in the context of a bipolar-valued outranking approach. These computing resources, made available under the name Digraph3, are useful in the field of Algorithmic Decision Theory and more specifically in outranking-based Multiple-Criteria Decision Aiding (MCDA). The first part of the book presents a set of tutorials introducing the Digraph3 collection of Python3 modules and its main objects such as bipolar-valued digraphs and outranking digraphs. The second part illustrates in eight methodological chapters multiple-criteria evaluation models and decision algorithms. These chapters are mostly problem oriented and show how edit a new multiple-criteria performance tableau, how to build a best choice recommendation, how to compute the winner of an election and how to rank or rate with incommensurable criteria. The book's third part presents three real decision case studies, while the fourth part addresses more advanced topics, such as computing ordinal correlations between bipolar-valued outranking digraphs, computing kernels in bipolar-valued digraphs, testing for confidence or stability of outranking statements when facing uncertain or solely ordinal criteria significance weights, and tempering plurality tyranny effects in social choice problems. The last part is more specifically focused on working with undirected graphs, tree graphs and forests. The closing chapter explores comparability, split, interval and permutation graphs. The book is primarily intended for graduate students in management sciences, computational statistics and operations research. Chapters presenting algorithms for ranking multicriteria performance records will be of computational interest for designers of web recommender systems. Similarly, the relative and absolute quantiles-rating algorithms, discussed and illustrated in several chapters, will be of practical interest for public or private performance auditors. [less ▲]

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See detailEsclavage, servitude, travail forcé : constitution et évolution d’un cadre conceptuel
Erpelding, Michel UL

in Marchadier, Fabien (Ed.) La prohibition de l'esclavage (in press)

This chapter examines the emergence, definition and evolution of the concepts of slavery, forced labour and servitude in international law.

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See detailLearning-Assisted User Clustering in Cell-Free Massive MIMO-NOMA Networks
Le, Quang Nhat; Nguyen, van Dinh UL; Dobre, Octavia A. et al

in IEEE Transactions on Vehicular Technology (in press)

The superior spectral efficiency (SE) and user fairness feature of non-orthogonal multiple access (NOMA) systems are achieved by exploiting user clustering (UC) more efficiently. However, a random UC ... [more ▼]

The superior spectral efficiency (SE) and user fairness feature of non-orthogonal multiple access (NOMA) systems are achieved by exploiting user clustering (UC) more efficiently. However, a random UC certainly results in a suboptimal solution while an exhaustive search method comes at the cost of high complexity, especially for systems of medium-to-large size. To address this problem, we develop two efficient unsupervised machine learning based UC algorithms, namely k-means++ and improved k-means++, to effectively cluster users into disjoint clusters in cell-free massive multiple-input multiple-output (CFmMIMO) system. Adopting full-pilot zero-forcing at access points (APs) to comprehensively assess the system performance, we formulate the sum SE optimization problem taking into account power constraints at APs, necessary conditions for implementing successive interference cancellation, and required SE constraints at user equipments. The formulated optimization problem is highly non-convex, and thus, it is difficult to obtain the global optimal solution. Therefore, we develop a simple yet efficient iterative algorithm for its solution. In addition, the performance of collocated massive MIMO-NOMA (COmMIMO-NOMA) system is also characterized. Numerical results are provided to show the superior performance of the proposed UC algorithms compared to baseline schemes. The effectiveness of applying NOMA in CFmMIMO and COmMIMO systems is also validated. [less ▲]

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See detailOn Frame Fingerprinting and Controller Area Networks Security in Connected Vehicles
Buscemi, Alessio UL; Turcanu, Ion; Castignani, German et al

in IEEE Consumer Communications & Networking Conference, Virtual Conference 8-11 January 2022 (2022, January)

Modern connected vehicles are equipped with a large number of sensors, which enable a wide range of services that can improve overall traffic safety and efficiency. However, remote access to connected ... [more ▼]

Modern connected vehicles are equipped with a large number of sensors, which enable a wide range of services that can improve overall traffic safety and efficiency. However, remote access to connected vehicles also introduces new security issues affecting both inter and intra-vehicle communications. In fact, existing intra-vehicle communication systems, such as Controller Area Network (CAN), lack security features, such as encryption and secure authentication for Electronic Control Units (ECUs). Instead, Original Equipment Manufacturers (OEMs) seek security through obscurity by keeping secret the proprietary format with which they encode the information. Recently, it has been shown that the reuse of CAN frame IDs can be exploited to perform CAN bus reverse engineering without physical access to the vehicle, thus raising further security concerns in a connected environment. This work investigates whether anonymizing the frames of each newly released vehicle is sufficient to prevent CAN bus reverse engineering based on frame ID matching. The results show that, by adopting Machine Learning techniques, anonymized CAN frames can still be fingerprinted and identified in an unknown vehicle with an accuracy of up to 80 %. [less ▲]

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See detailZielkonflikte zwischen Lernen und Freizeit
Hofer, Manfred; Fries, Stefan; Grund, Axel UL

in Reinders, Heinz; Bergs-Winkels, Dagmar; Prochnow, Annette (Eds.) et al Empirische Bildungsforschung: Eine elementare Einführung (2022)

Häufig wollen junge Menschen lernen und gleichzeitig etwas anderes tun, das für sie wichtig ist. Sie müssen sich dann für eine der beiden Handlungen entscheiden. Es stellt sich die Frage, ob Anreize der ... [more ▼]

Häufig wollen junge Menschen lernen und gleichzeitig etwas anderes tun, das für sie wichtig ist. Sie müssen sich dann für eine der beiden Handlungen entscheiden. Es stellt sich die Frage, ob Anreize der nicht-gewählten Handlung die Ausübung der gewählten Lern- oder Freizeithandlung im Hinblick auf kognitive und motivationale Aspekte stören (motivationale Interferenz). Es wird auch nach Bedingungen und Folgen dieser Erscheinung gefragt und es werden Maßnahmen zur Minimierung von Zielkonflikten und zur Herstellung einer ausgewogenen Zeitverteilung auf Tätigkeiten in verschiedenen Lebensbereichen vorgeschlagen. [less ▲]

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See detailLe Luxembourg et l’institutionnalisation de la justice internationale : un exemple de politique juridique extérieure (1863-1940)
Erpelding, Michel UL

in Fritz, Vera; Scuto, Denis; Wingerter, Elisabeth (Eds.) Histoire de la Justice au Luxembourg (1795 à nos jours) : Institutions, organisation, acteurs (2021)

Based on both printed and archival sources, chapter examines the foreign policy of Luxembourg in the field of international adjudication, from the 1860s, when Luxembourg had its first experience with ... [more ▼]

Based on both printed and archival sources, chapter examines the foreign policy of Luxembourg in the field of international adjudication, from the 1860s, when Luxembourg had its first experience with international arbitration, until the interwar period, when Luxembourg sought to preserve its independence by systematically signing arbitration treaties with Western states. [less ▲]

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See detailContesting war memories: Parties and voters in contemporary Southeast Europe
Glaurdic, Josip UL; Lesschaeve, Christophe UL; Mochtak, Michal UL

in Party Politics (2021)

Over the past four decades, there has been a proliferation of interest in the causes, consequences, and dynamics of contestation over collective memories across a variety of fields. Unfortunately ... [more ▼]

Over the past four decades, there has been a proliferation of interest in the causes, consequences, and dynamics of contestation over collective memories across a variety of fields. Unfortunately, collective memories—particularly those of traumatic experiences of violence such as wars and revolutions—have been largely absent from party politics research. Using data collected in an expert survey on the policy positions and ideological orientations of all relevant political parties, as well as an extensive survey of more than ten thousand voters in the six post-conflict countries of Southeast Europe, we demonstrate that collective memories of war are not only subjects of historiographical contestation but are also significant sources of ideological and policy differentiation among political parties, as well as one of the strongest determinants of voter choice. Our analysis shows that collective memories are politically contested and that party politics research would benefit from taking them seriously. [less ▲]

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See detailThe Past Web as Heritage: Practices, Challenges and Uses of Web Archives
Schafer, Valerie UL

Scientific Conference (2021, October 20)

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See detailThe Future of Living with AI
Schommer, Christoph UL

Speeches/Talks (2021)

This talk, which was part of a 2-hour panel and delivered as a 20-minute presentation without slides, came at the invitation of the Luxembourg Embassy in Brussels, Belgium. The speech is a statement and ... [more ▼]

This talk, which was part of a 2-hour panel and delivered as a 20-minute presentation without slides, came at the invitation of the Luxembourg Embassy in Brussels, Belgium. The speech is a statement and part of the International Symposium "The Future of Living", supported by EUNIC - EU National Institutes of Culture. The event was under the patronage of the Slovenian Presidency of the European Parliament. In the lecture, I briefly presented some selected ideas, observations, and examples on the symposium topic as well as my view of a future living together. [less ▲]

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See detailResilienz und Wohlbefinden älterer Menschen in der COVID-19 Pandemie
Albert, Isabelle UL

Presentation (2021, October 18)

Ältere Erwachsene galten ungeachtet der großen Heterogenität dieser Altersgruppe während der COVID-19-Pandemie als Risikogruppe. Während eine Reduzierung der persönlichen Kontakte vor allem in den ersten ... [more ▼]

Ältere Erwachsene galten ungeachtet der großen Heterogenität dieser Altersgruppe während der COVID-19-Pandemie als Risikogruppe. Während eine Reduzierung der persönlichen Kontakte vor allem in den ersten Monaten der Pandemie notwendig war, um das Virus einzudämmen und vulnerable Personen vor Ansteckung zu schützen, wurden schnell Bedenken hinsichtlich der sekundären Auswirkungen dieser Maßnahmen auf das subjektive Wohlbefinden geäußert. Der vorliegende Beitrag befasst sich damit, wie ältere Erwachsene die COVID-19 Pandemie und die damit verbundenen Einschränkungen selbst erlebten. Dabei wird Bezug auf zwei Studien genommen, die 2020 in Luxemburg durchgeführt wurden – CRISIS und PAN-VAL. Ziel des vom FNR finanzierten CRISIS-Projekts war es, herauszufinden, wie ältere Erwachsene (60+) in Luxemburg die Sicherheitsmaßnahmen und deren Kommunikation an die Öffentlichkeit während der ersten Monate der Pandemie erlebten. Dabei wurden Daten von unabhängig lebenden Personen zu zwei Messzeitpunkten (N = 611 im Juni und N = 523 im Oktober 2020) erhoben sowie N = 84 Personen in Altersheimen befragt. Die vom Ministerium für Familie und Integration geförderte Studie PAN-VAL befasste sich mit dem aktiven Altern von Luxemburgern und Nicht-Luxemburgern. Im Dezember 2020 wurden N = 1000 in Luxemburg lebende Personen ab 50 Jahre befragt, wobei neben der Lebenszufriedenheit, dem sozialen Eingebundensein und gemeinschaftlichen Aktivitäten auch das Erleben von Einsamkeit vor und seit der Corona-Pandemie erfasst wurde. Die vorliegenden Analysen konzentrieren sich auf die selbstberichtete Resilienz, Einsamkeitserleben und subjektives Wohlbefinden älterer Menschen sowie auf deren Bedingungsfaktoren während der Pandemie. [less ▲]

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See detailTwo centuries of music education in Luxembourg. 'Learning to teach' in the focus of two traditions
Sagrillo, Damien François UL

Scientific Conference (2021, October 15)

Mit der Teilung Luxemburgs zu Beginn des 19. Jahrhunderts wird das Land einsprachig. Es verbleibt der luxemburgischsprachige (moselfränkische) Teil. Zum besseren Verständnis der kulturellen Entwicklung ... [more ▼]

Mit der Teilung Luxemburgs zu Beginn des 19. Jahrhunderts wird das Land einsprachig. Es verbleibt der luxemburgischsprachige (moselfränkische) Teil. Zum besseren Verständnis der kulturellen Entwicklung Luxemburgs – sie setzt für die musikalische Bildung um die Mitte des 19. Jahrhunderts ein – ist das Wissen um den historischen Kontext unerlässlich. Publikationen erster musikpädagogischer Werke, in der Mehrzahl Liederbücher, werden mit didaktischen Anweisungen eingeleitet, stehen nicht selten unter der Einflussnahme der katholischen Kirche und werden in einschlägigen Publikationsorganen behandelt. Dabei spielt die Bewegung des Cäcilianismus eine herausgehobene Rolle. Der erste spezialisierte Musikunterricht (Instrumentalunterricht und Gesangsunterricht) erfolgt in Privatinitiative, bis im Jahr 1844 der Gemeinderat der Stadt Luxemburg der Gründung der ersten öffentlichen Musikschule im Großherzogtum zustimmt. Die Besetzung von Direktorenposten und Lehrern abwechselnd mit deutsch- und mit französischsprachigen Persönlichkeiten führt zu einem Sonderweg musikpädagogischen Wirkens. Seit dem Jahrhundertwechsel sind die Grundsteine des spezialisierten Musikunterrichts gelegt. Die geographische Nähe zum Pariser bzw. zum Brüsseler Konservatorium führen jedoch überwiegend zur Übernahme der dort vorherrschenden Traditionen. Das Thema des Symposiums 'Das Lehren lernen' bewahrheitet sich hier in der Negation. Angehende Lehrer sind zuerst Musiker, dann Lehrer. Das Erwerben von Expertise erfolgt vielfach durch Lernen in der Praxis. Diese Tendenz setzt sich z.T. bis heute fort. Studiengänge für musikpädagogische Praxis werden in französischsprachigen Ländern sehr spät angeboten und existieren in Luxemburg bis heute nicht. Auf der anderen Seite folgt der Musikunterricht (Gesangunterricht) in Grund- und Sekundarschulen eher der Vorgehensweise in deutschsprachigen Ländern. Die gegenseitige Beeinflussung im Fokus der beiden Traditionen ist in diesem Bereich weniger ausgeprägt. Für meinen Vortrag schlage ich einen historischen Überblick über die Entwicklung der Musikpädagogik in Luxemburg anhand von der Organisation des spezialisierten Musikunterrichts vor. Die Ausbildung der Lehrenden im Bereich der Kirchenmusik gehört als integrativer Bestandteil in den Vortrag mit einbezogen. [less ▲]

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See detailNonstandard n-distances based on certain geometric constructions
Kiss, Gergely; Marichal, Jean-Luc UL

E-print/Working paper (2021)

The concept of n-distance was recently introduced to generalize the classical definition of distance to functions of n arguments. In this paper we investigate this concept through a number of examples ... [more ▼]

The concept of n-distance was recently introduced to generalize the classical definition of distance to functions of n arguments. In this paper we investigate this concept through a number of examples based on certain geometrical constructions. In particular, our study shows to which extent the computation of the best constant associated with an n-distance may sometimes be difficult and tricky. It also reveals that two important graph theoretical concepts, namely the total length of the Euclidean Steiner tree and the total length of the minimal spanning tree constructed on n points, are instances of n-distances. [less ▲]

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See detailPost-Urban Mining Automation and Digitalisation for a Closed- Loop Circular Construction
Akbarieh, Arghavan UL; Schäfer, Markus UL; Waldmann, Daniele UL et al

Poster (2021, October 13)

The large volume of in- and out-flow of raw materials to construction projects has a huge potential to be optimised for resource efficiency and waste reduction. With the recent awareness of the importance ... [more ▼]

The large volume of in- and out-flow of raw materials to construction projects has a huge potential to be optimised for resource efficiency and waste reduction. With the recent awareness of the importance of the circular economy, construction actors are aligning their practices to be more circular and sustainable. The concept of material banks is born out of this awareness in order to document the lifecycle information of materials and facilitate re-using them. The introduction of new cycles before individual materials reach their final lifecycle stages results in reduced negative environmental impacts. This paper presents a workflow by positioning different digital technologies to automate the procedures for reuse assessment: from the deconstructed building to M/C bank to new construction projects. This automation supports a practical material and component reuse, while it provides the necessary infrastructure to digitise and digitalise the post-deconstruction materials to be visualised, selected and used by future designers in Building Information Modelling (BIM)-based design and management environments. To this aim, the coupling of BIM, reality capturing technologies, additive manufacturing techniques, IoT and RFID sensors is also anticipated. [less ▲]

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See detailEl Estado de Bienestar de la 4T y La Tercera Vía
Huitrón García, Patricia Manuela; Cebotari, Victor UL; Rodríguez Rosario, David Gustavo

Article for general public (2021)

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See detailBismut-Stroock Hessian formulas and local Hessian estimates for heat semigroups and harmonic functions on Riemannian manifolds
Chen, Qin-Qian; Cheng, Li-Juan; Thalmaier, Anton UL

E-print/Working paper (2021)

In this article, we develop a martingale approach to localized Bismut-type Hessian formulas for heat semigroups on Riemannian manifolds. Our approach extends the Hessian formulas established by Stroock ... [more ▼]

In this article, we develop a martingale approach to localized Bismut-type Hessian formulas for heat semigroups on Riemannian manifolds. Our approach extends the Hessian formulas established by Stroock (1996) and removes in particular the compact manifold restriction. To demonstrate the potential of these formulas, we give as application explicit quantitative local estimates for the Hessian of the heat semigroup, as well as for harmonic functions on regular domains in Riemannian manifolds. [less ▲]

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See detailLeveraging High-Frequency Components for Deepfake Detection
Mejri, Nesryne UL; Papadopoulos, Konstantinos UL; Aouada, Djamila UL

in IEEE Workshop on Multimedia Signal Processing (2021)

In the past years, RGB-based deepfake detection has shown notable progress thanks to the development of effective deep neural networks. However, the performance of deepfake detectors remains primarily ... [more ▼]

In the past years, RGB-based deepfake detection has shown notable progress thanks to the development of effective deep neural networks. However, the performance of deepfake detectors remains primarily dependent on the quality of the forged content and the level of artifacts introduced by the forgery method. To detect these artifacts, it is often necessary to separate and analyze the frequency components of an image. In this context, we propose to utilize the high-frequency components of color images by introducing an end-to-end trainable module that (a) extracts features from high-frequency components and (b) fuses them with the features of the RGB input. The module not only exploits the high-frequency anomalies present in manipulated images but also can be used with most RGB-based deepfake detectors. Experimental results show that the proposed approach boosts the performance of state-of-the-art networks, such as XceptionNet and EfficientNet, on a challenging deepfake dataset. [less ▲]

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See detailAdvanced Characterizations of Silica Surface in Rubber Compounds by Solid-State Nuclear Magnetic Resonance Spectroscopy
Yan, Chuanyu UL

Doctoral thesis (2021)

This thesis details the development, validation, and application of advanced solid-state nuclear Magnetic resonance spectroscopy (NMR) techniques for the characterization of the silica surface in raw ... [more ▼]

This thesis details the development, validation, and application of advanced solid-state nuclear Magnetic resonance spectroscopy (NMR) techniques for the characterization of the silica surface in raw materials and in rubber compounds. The performance of the quantitative techniques (29Si DP-CPMG, SVD and 29Si multiCP) and qualitative techniques (29Si CP-CPMG and {1H-29Si}-1H MCPi) are investigated using model and close-to-real life samples. The insights gained from this study are useful for the surface-specific characterization of silica and could offer clues for similar topics. [less ▲]

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See detailCyborg, IA et société "cyborgisée" : l’avènement d’une société-ruche
Derian, Maxime UL

in Collectif (Ed.) Aux frontières de l'humain (2021)

If the cyborg remains a human - repaired, augmented or diminished -, the emergence of metaphorical or real figures such as the latter as well as hybrids, robots, drones and AIs, is perhaps the expression ... [more ▼]

If the cyborg remains a human - repaired, augmented or diminished -, the emergence of metaphorical or real figures such as the latter as well as hybrids, robots, drones and AIs, is perhaps the expression of an anthropological major shift. Indeed, beyond the question of the enhanced humanity, transhumanism and the possibility of posthumanism, it seems topical to ask whether it is not society itself that is in the process of becoming 'cyborgised' on a global scale. In such a case, rather than listing the anthropotechnical technologies (of human modification) that have appeared since the invention of computers, it seems appropriate to anticipate and attempt to understand the ethical, political, economic and social issues emblematic of these technologies. Hence the concept of the 'hive-society', used to describe this possible major break in history marked by the advent of an organisation that is above all administered by - and sometimes for - digital machines. [less ▲]

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See detailSix provocations for 6G
Schafer, Valerie UL

Scientific Conference (2021, October 06)

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