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See detailFrom Persistent Homology to Reinforcement Learning with Applications for Retail Banking
Charlier, Jérémy Henri J. UL

Doctoral thesis (2019)

The retail banking services are one of the pillars of the modern economic growth. However, the evolution of the client’s habits in modern societies and the recent European regulations promoting more ... [more ▼]

The retail banking services are one of the pillars of the modern economic growth. However, the evolution of the client’s habits in modern societies and the recent European regulations promoting more competition mean the retail banks will encounter serious challenges for the next few years, endangering their activities. They now face an impossible compromise: maximizing the satisfaction of their hyper-connected clients while avoiding any risk of default and being regulatory compliant. Therefore, advanced and novel research concepts are a serious game-changer to gain a competitive advantage. In this context, we investigate in this thesis different concepts bridging the gap between persistent homology, neural networks, recommender engines and reinforcement learning with the aim of improving the quality of the retail banking services. Our contribution is threefold. First, we highlight how to overcome insufficient financial data by generating artificial data using generative models and persistent homology. Then, we present how to perform accurate financial recommendations in multi-dimensions. Finally, we underline a reinforcement learning model-free approach to determine the optimal policy of money management based on the aggregated financial transactions of the clients. Our experimental data sets, extracted from well-known institutions where the privacy and the confidentiality of the clients were not put at risk, support our contributions. In this work, we provide the motivations of our retail banking research project, describe the theory employed to improve the financial services quality and evaluate quantitatively and qualitatively our methodologies for each of the proposed research scenarios. [less ▲]

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See detailKünstliche Intelligenz für die Medizin
Schommer, Christoph UL

Article for general public (2019)

Innovative developments in Artificial Intelligence (AI), Data Science and Computer Engineering have led to far-reaching consequences for many areas of economic and social life, including medicine and ... [more ▼]

Innovative developments in Artificial Intelligence (AI), Data Science and Computer Engineering have led to far-reaching consequences for many areas of economic and social life, including medicine and healthcare. This article presents some scientific innovations, but at the same time pleads for the inclusion of important factors such as explainability, ethics, comprehensibility and others. [less ▲]

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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 detailL'utilisation politique de l'histoire par le Parlement européen
Spirinelli, Fabio UL

Article for general public (2019)

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See detailDiscussion of "Do ETFs Increase Liquidity?" by Mehmet Saglam, Tugkan Tuzun and Russ Wermers
Holcblat, Benjamin UL

Scientific Conference (2019, October 18)

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See detailRoundtable on uses of Web archives and concluding remarks
Schafer, Valerie UL

Presentation (2019, October 18)

Descriptif de la journée Le vendredi 18 octobre 2019, les Archives de l’État et la Bibliothèque royale (KBR) vous emmèneront dans l’univers complexe de l’archivage du web, lors d’un colloque sous le thème ... [more ▼]

Descriptif de la journée Le vendredi 18 octobre 2019, les Archives de l’État et la Bibliothèque royale (KBR) vous emmèneront dans l’univers complexe de l’archivage du web, lors d’un colloque sous le thème « Saving the web : the promise of a Belgian web archive ». Pourquoi le web belge devrait-il être archivé ? Quel contenu du web belge est/sera sauvegardé ? Qu’est-ce au fond, le web belge ? Quels instruments sont utilisés pour archiver le web ? Comment le contenu est-il sauvegardé ? Comment peut-on avoir accès aux archives du web ? Quels sont les besoins des utilisateurs en matière d’archives du web ? Qu’en est-il de l’archivage du web à l’étranger ? Quels sont les aspects juridiques que les Archives de l’État et la Bibliothèque royale doivent prendre en compte ? Depuis 2017, les Archives de l’État, la KBR, les universités de Gand (Research Group for Media, Innovation and Communication Technologies ; Ghent Centre for Digital Humanities) et de Namur (Research Centre in Information, Law and Society) et la Haute-École Bruxelles-Brabant (Unité de Recherche et de Formation en Sciences de l’Information et de la Documentation) développent une stratégie pour l’archivage du web au niveau fédéral, dans le cadre du projet de recherche PROMISE. Les chercheurs de ce projet, qui est financé par le SPP Politique scientifique (Belspo), auront le plaisir de présenter les résultats de leurs travaux lors d’un colloque consacré à l’archivage du web. Entre-temps, ils continuent à mettre en place et à tester une plateforme d’accès, ils contrôlent la qualité des informations archivées et ils analysent en profondeur les aspects juridiques des modalités de consultation des archives du web. Après l’été, la stratégie sera présentée au comité de direction des Archives de l’État et de la KBR, et ensuite, des procédures concrètes seront élaborées. [less ▲]

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See detailApproche européenne sur l'entreprise : de la nouveauté ?
Corbisier, Isabelle UL

Scientific Conference (2019, October 17)

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

Scientific Conference (2019, October 17)

Detailed reference viewed: 38 (6 UL)
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See detailChildhood trauma affects stress-related interoceptive accuracy
Schaan, Violetta UL; Schulz, André UL; Rubel, Julian A. et al

in Frontiers in Psychiatry (2019), 10(1), 750

Early life adversity (ELA) may cause permanent disturbances in brain-body signaling. These disturbances are thought to contribute to physical symptoms and emotional dysregulation in adulthood. The current ... [more ▼]

Early life adversity (ELA) may cause permanent disturbances in brain-body signaling. These disturbances are thought to contribute to physical symptoms and emotional dysregulation in adulthood. The current study investigated the effects of childhood trauma on young adults’ interoceptive accuracy as an indicator of brain-body communication that may be dysregulated by ELA. Sixty-six participants completed an online-questionnaire followed by a laboratory session including the socially-evaluated cold pressor stress test during which ECG, salivary cortisol and interoceptive accuracy were assessed. Childhood trauma was negatively related to interoceptive accuracy (IAc) after the stressor. This stress-effect could not be observed for heart rate and cortisol, which were unrelated to IAc. Participants reporting higher baseline unpleasantness exhibited lower IAc after the stressor, while increases in unpleasantness due to the stressor were associated with higher IAc. Unpleasantness at baseline mediated the effect of childhood trauma on IAc after the stressor. [less ▲]

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See detailRegards belges sur le Luxembourg 1919-1921
Brüll, Christoph UL

Scientific Conference (2019, October 17)

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See detailRegards allemands sur le Luxembourg
Brüll, Christoph UL

Scientific Conference (2019, October 17)

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See detailTravail frontalier en Suisse et au Luxembourg : mobilités, profils et défis
Pigeron-Piroth, Isabelle UL; Helfer, Malte UL; Belkacem, Rachid

Scientific Conference (2019, October 15)

La Suisse et le Luxembourg sont particulièrement concernés par le travail frontalier. Ces deux pays accueillent à eux seuls plus d’un demi-million de travailleurs frontaliers et recourent à la main ... [more ▼]

La Suisse et le Luxembourg sont particulièrement concernés par le travail frontalier. Ces deux pays accueillent à eux seuls plus d’un demi-million de travailleurs frontaliers et recourent à la main-d’œuvre frontalière depuis plusieurs décennies. Petits pays dynamiques ayant d’importants besoins de main-d’œuvre, ils se caractérisent par des différentiels liés à la présence de frontières (différentiels de prix immobiliers, de taux de chômage, de salaires, de niveaux d’activité économique … avec les pays voisins). Ces différentiels entretiennent la dynamique du travail frontalier (Belkacem et Pigeron-Piroth, 2016). [less ▲]

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See detailConstant Gaussian curvature foliations and Schläfli formulas of hyperbolic 3-manifolds
Mazzoli, Filippo UL

E-print/Working paper (2019)

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary ... [more ▼]

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary. First, we show that the Thurston and the Schwarzian parametrizations are the limits of two families of parametrizations of the space of hyperbolic ends, defined by Labourie in 1992 in terms of the geometry of the leaves S_k. We give a new description of the renormalized volume using the constant curvature foliation. We prove a generalization of McMullen's Kleinian reciprocity theorem, which replaces the role of the Schwarzian parametrization with Labourie's parametrizations. Finally, we describe the constant curvature foliation of a hyperbolic end as the integral curve of a time-dependent Hamiltonian vector field on the cotangent space to Teichmüller space, in analogy to the Moncrief flow for constant mean curvature foliations in Lorenzian space-times. [less ▲]

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See detailSpherical CR uniformization of Dehn surgeries of the Whitehead link complement
Acosta, Miguel UL

in Geometry and Topology (2019), 23(5), 25932664

We apply a spherical CR Dehn surgery theorem in order to obtain infinitely many Dehn surgeries of the Whitehead link complement that carry spherical CR structures. We consider as a starting point the ... [more ▼]

We apply a spherical CR Dehn surgery theorem in order to obtain infinitely many Dehn surgeries of the Whitehead link complement that carry spherical CR structures. We consider as a starting point the spherical CR uniformization of the Whitehead link complement constructed by Parker and Will, using a Ford domain in the complex hyperbolic plane H2C. We deform the Ford domain of Parker and Will in H2C in a one-parameter family. On one side, we obtain infinitely many spherical CR uniformizations on a particular Dehn surgery on one of the cusps of the Whitehead link complement. On the other side, we obtain spherical CR uniformizations for infinitely many Dehn surgeries on the same cusp of the Whitehead link complement. These manifolds are parametrized by an integer n≥4, and the spherical CR structure obtained for n=4 is the Deraux–Falbel spherical CR uniformization of the figure eight knot complement. [less ▲]

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See detailInside the Trading Zone: Doing Digital Hermeneutics in an Interdisciplinary Setting
van der Heijden, Tim UL; Tatarinov, Juliane UL

Scientific Conference (2019, October 11)

Our contribution examines the conference theme of digital hermeneutics from the perspective of the Doctoral Training Unit (DTU) in ‘Digital History and Hermeneutics’, a four-year interdisciplinary ... [more ▼]

Our contribution examines the conference theme of digital hermeneutics from the perspective of the Doctoral Training Unit (DTU) in ‘Digital History and Hermeneutics’, a four-year interdisciplinary research and training program hosted by the Centre for Contemporary and Digital History (C²DH) at the University of Luxembourg. The DTU is designed as an experimental platform for collaboration or ‘trading zone’, in which thirteen doctoral candidates with different disciplinary backgrounds – from history, linguistics and philosophy to computer and information science – study and reflect on the epistemological and methodological implications of the ‘digital turn’ on historical research. This presentation reflects on the project’s first year, in which the doctoral candidates were introduced to various skills and methods in digital humanities, including text mining, digital source criticism, database structures, data visualization, GIS analysis, tool criticism and algorithmic critique; and its second year, when data collections had been created and research tools identified that were going to be applied to it. By doing so, it presents some of the main practical and epistemological opportunities and challenges of “thinkering” with digital tools and technologies in the Digital History Lab of the C2DH, and it reflects scientific dissemination strategies for the group and the individual. The analysis is informed by studies on interdisciplinarity, digital humanities infrastructures and communities of practice. It furthermore draws on a series of semi-structured interviews and self-reflexive training reports, in which the doctoral candidates of the DTU reflect on their experiences in doing digital hermeneutics in an interdisciplinary setting. [less ▲]

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See detailModelling of Railways Signalling System Requirements by Controlled Natural Languages: A Case Study
Lenzini, Gabriele UL; Petrocchi, Marinella

in From Software Engineering to Formal Methods and Tools, and Back (2019)

The railway sector has been a source of inspiration for generations of researchers challenged to develop models and tools to analyze safety and reliability. Threats were coming mainly from within, due to ... [more ▼]

The railway sector has been a source of inspiration for generations of researchers challenged to develop models and tools to analyze safety and reliability. Threats were coming mainly from within, due to occasionally faults in hardware components. With the advent of smart trains, the railway industry is venturing into cybersecurity and the railway sector will become more and more compelled to protect assets from threats against information & communication technology. We discuss this revolution at large, while speculating that instruments developed for security requirements engineering can then come in support of in the railway sector. And we explore the use of one of them: the Controlled Natural Language for Data Sharing Agreement (CNL4DSA). We use it to formalize a few exemplifying signal management system requirements. Since CNL4DSA enables the automatic generation of enforceable access control policies, our exercise is preparatory to implementing the security-by design principle in railway signalling management engineering. [less ▲]

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See detailParadox: Mehr Bildung, weniger Gleichheit
Powell, Justin J W UL

in Powell, Justin J W (Ed.) Wissen aktuell: Exoplaneten, Urknall und Bildung (2019)

Bildung für sozialen Fortschritt: Wie wirkt sich ein Mehr an Bildung auf eine Gesellschaft aus? Dieser Frage widmete sich eine Tagung am Institut für Höhere Studien in Wien. In den vergangenen Jahrzenten ... [more ▼]

Bildung für sozialen Fortschritt: Wie wirkt sich ein Mehr an Bildung auf eine Gesellschaft aus? Dieser Frage widmete sich eine Tagung am Institut für Höhere Studien in Wien. In den vergangenen Jahrzenten ist der Bildungsstand weltweit gestiegen und geht mit einem längeren, gesünderen Leben, einer höheren Produktivität und mehr zivilgesellschaftlichem Engagement einher. Gleichzeitig kann Bildung die soziale Ungleichheit verschärfen. Gestaltung: Julia Geistberger Mit: Justin Powell, Bildungssoziologe Universität Luxemburg Redaktion: Barbara Daser [less ▲]

Detailed reference viewed: 59 (6 UL)
See detailJohn Locke und wie man sich nicht vorstellt, eine andere Person zu sein
Fraissler, Hannes UL

in Meer, Rudolf; Motta, Giuseppe; Stiening, Gideon (Eds.) Konzepte der Einbildungskraft in der Philosophie, den Wissenschaften und den Künsten des 18. Jahrhunderts (2019)

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See detailDeconstructing Blockchains: A Comprehensive Survey on Consensus, Membership and Structure
Natoli, Christopher; Yu, Jiangshan; Gramoli, Vincent et al

E-print/Working paper (2019)

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a ... [more ▼]

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a flurry of proposals addressing variations and/or trying to solve problems stemming from the initial specification. This added considerable complexity to the current blockchain ecosystems, amplified by the absence of detail in many accompanying blockchain whitepapers. Through this paper, we set out to explain blockchains in a simple way, taming that complexity through the deconstruction of the blockchain into three simple, critical components common to all known systems: membership selection, consensus mechanism and structure. We propose an evaluation framework with insight into system models, desired properties and analysis criteria, using the decoupled components as criteria. We use this framework to provide clear and intuitive overviews of the design principles behind the analyzed systems and the properties achieved. We hope our effort will help clarifying the current state of blockchain proposals and provide directions to the analysis of future proposals. [less ▲]

Detailed reference viewed: 35 (1 UL)
See detailThe ESP estimator
Holcblat, Benjamin UL; Sowell, Fallaw

Scientific Conference (2019, October 08)

Detailed reference viewed: 23 (1 UL)