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See detailLaurent Menager (1835-1902). Kritische Gesamtausgabe, Abteilung I: Vokalwerke, Band 4, Weltliche Vokalwerke
Anders, Ursula UL; Reuter, Caroline; Sagrillo, Damien François UL et al

Book published by Merseburger (2021)

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See detailThe Digital Humanities Classroom as a “Node”. From Toolbox to Mindset?
Armaselu, Florentina UL

in DH Benelux Journal (2021), 3(Autumn 2021), 103-115

The paper describes a framework for digital pedagogy and evaluation that combines different approaches – theoretical, application-oriented and project-based –, underpinned by a view of the digital ... [more ▼]

The paper describes a framework for digital pedagogy and evaluation that combines different approaches – theoretical, application-oriented and project-based –, underpinned by a view of the digital humanities classroom metaphorically defined as a “node”. The metaphor encompasses the hybrid character of digital humanities teaching, as a crossing or convergence of paths, which involves the use of various categories of study materials, themes, examples, methodologies and skills, as well as exchange, circulation of ideas and connection with other disciplines. It is assumed that the application of this type of hybrid approach in the course design, together with the coverage of a variety of tools to be studied in class, might foster a reflective mindset, enabling the students to contextualise the digital technologies within different humanities areas, beyond the acquisition of technical skills and knowledge of computational methods and tools usually referred to as the toolbox-based education paradigm. [less ▲]

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See detailBeeinträchtigung und soziale Partizipation in Familie und Schule
Stöcker, Anne UL; Zurbriggen, Carmen

Presentation (2021, October)

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See detailPakeMail: Authentication and Key Management in Decentralized Secure Email and Messaging via PAKE
Vazquez Sandoval, Itzel UL; Atashpendar, Arash; Lenzini, Gabriele UL et al

in Obaidat, Mohammad S.; Ben-Othman, Jalel (Eds.) E-Business and Telecommunications - 17th International Conference on E-Business and Telecommunications, ICETE 2020, Online Event, July 8-10, 2020, Revised Selected Papers. (2021, October)

We propose the use of password-authenticated key exchange (PAKE) for achieving and enhancing entity authentication (EA) and key management (KM) in the context of decentralized end-to-end encrypted email ... [more ▼]

We propose the use of password-authenticated key exchange (PAKE) for achieving and enhancing entity authentication (EA) and key management (KM) in the context of decentralized end-to-end encrypted email and secure messaging, i.e., without a public key infrastructure or a trusted third party. This not only simplifies the EA process by requiring users to share only a low-entropy secret such as a memorable word, but it also allows us to establish a high-entropy secret key. This approach enables a series of cryptographic enhancements and security properties, which are hard to achieve using out-of-band (OOB) authentication. We first study a few vulnerabilities in voice-based OOB authentication, in particular a combinatorial attack against lazy users, which we analyze in the context of a secure email solution. We then propose tackling public key authentication by solving the problem of secure equality test using PAKE and discuss various protocols and their properties. This method enables the automation of important KM tasks such as key renewal and future key pair authentications, reduces the impact of human errors and lends itself to the asynchronous nature of email and modern messaging. It also provides cryptographic enhancements including multi-device synchronization, and secure secret storage/retrieval, and paves the path for forward secrecy, deniability and post-quantum security.We also discuss the use of auditable PAKEs for mitigating a class of online guess and abort attacks in authentication protocols. We present an implementation of our proposal, called PakeMail, to demonstrate the feasibility of the core idea and discuss some of its cryptographic details, implemented features and efficiency aspects. We conclude with some design and security considerations, followed by future lines of work. [less ▲]

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See detailDATA DISTRIBUTION API SPECIFICATION
Blanco, Braulio UL; Brorsson, Mats Hakan UL

Report (2021)

The second deliverable for the Script Project: API Specification

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See detailDelta-kick cooling, time-optimal control of scale-invariant dynamics, and shortcuts to adiabaticity assisted by kicks
Dupays, Léonce UL; Spierings, David C.; Steinberg, Aephraim M. et al

in Physical Review Research (2021)

Delta-kick cooling (DKC) is used to compress the momentum distribution of ultracold quantum matter. It combines expansion dynamics with the use of kick pulses, designed via classical methods, that bring ... [more ▼]

Delta-kick cooling (DKC) is used to compress the momentum distribution of ultracold quantum matter. It combines expansion dynamics with the use of kick pulses, designed via classical methods, that bring the system to rest.We introduce an exact approach to DKC for arbitrary scale-invariant dynamics of quantum gases, lifting the original restrictions to free evolution and noninteracting systems, to account for the control of atomic clouds in a time-dependent harmonic trap that can be either repulsive (inverted) or confining. We show that DKC assisted by a repulsive potential outperforms the conventional scheme, and that sudden trap-frequency quenches combined with DKC are equivalent to time-optimal bang-bang protocols.We further show that reverse engineering of the scale-invariant dynamics under smooth trap-frequency modulations can be combined with DKC to introduce a new class of shortcuts to adiabaticity assisted by kicks. [less ▲]

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See detailMachine learning for surgical time prediction
Martinez, Oscar; Martinez Luna, Carol UL; Parra, Carlos et al

in Computer Methods and Programs in Biomedicine (2021)

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See detailStructuration of piezotronic junctions for ultrasensitive strain sensors
Joly, Raoul Joseph Adolphe UL

Doctoral thesis (2021)

The piezotronic effect relies on the creation of piezoelectric polarization charges mechanically induced within a piezoelectric semiconductor to modulate the carrier dynamics across electronic contact ... [more ▼]

The piezotronic effect relies on the creation of piezoelectric polarization charges mechanically induced within a piezoelectric semiconductor to modulate the carrier dynamics across electronic contact interfaces. The field of piezotronics is a relatively new area of study, based on a mechanical signal triggering, which is one of the most common kind of interactions between the environment and electronic systems. It started to draw a considerable attention in the early 2010’s, by reaching higher electromechanical sensitivities when compared to conventional methods of sensing. The rapidly spreading Internet-of-Things is accelerating Micro-ElectroMechanical Systems (MEMS) industry to deliver highly sensitive and miniaturized self-sensing sensors with low power consumption and cost-effective production process. Within this context, strain sensors based on the piezotronic effect appear as promising candidates to address these needs. However, several crucial questions remain unanswered or need to be refined, concerning the design and integration of piezotronic junctions with its fabrication process into microsystems or MEMS, the optimal configuration for strain sensing as well as noise studies for such systems. This PhD thesis proposes to rationalize the piezotronic effect for strain sensors and presents a novel microfabrication process integrating for the first time piezotronic strain sensors in millimetre-sized cantilevers on flexible polymeric substrates by means of maskless laser lithography. The atomic layer deposition (ALD) technique was used for the deposition of ZnO polycrystalline thin films on high work function metals to obtain Schottky junctions. However, such ZnO-based Schottky junctions by ALD have never been post-processed and integrated into a strain sensor. We propose to rationalize the ALD processing to obtain wurtzite polycrystalline zinc oxide thin films with a privileged (002) orientation and to make it compatible with microfabrication processing on polymer. The difficulties linked with the integration of inorganic thin films onto a polymeric substrate within the developed microfabrication process will be highlighted. We propose appropriate adjustments of the sensor’s design and the process flow. Pt/ZnO/Pt back-to-back Schottky diode junctions have been shaped in interdigitated microelectrodes to get piezotronic strain sensing on the clamp area of the cantilever structure. The conduction mechanisms occurring within the piezotronic strain microsensors have been thoroughly studied, based on the thermionic emission model. The developed electrical model will be detailed, emphasizing the presence of interface trap states and their prominent impact on the electrical characteristics. The piezotronic strain sensors’ transducing properties will be detailed as well by the mean of force spectroscopy, leading to the expected Schottky barrier height modulation by the piezotronic effect. Furthermore, we investigated for the first time the noise figure of within strain sensors based on the piezotronic effect. These new insights about noise amplitudes and origins are promising matter of optimization to improve the signal-to-noise ratio of the sensor. Within the last section of this work, we will detail the piezotronic strain sensors size miniaturization for integration in microcantilevers in a full-SU8 body. The miniaturization of our strain sensors makes them more prone for AFM (Atomic Force Microscopy) scanning probe operations on commercial machines, with the aim of greatly improving the sensitivity to small mechanical deformations. The approach taken for the microfabrication of these miniaturized sensors is based on a reversed processing by the mean of a sacrificial layer. This raised new difficulties in terms of metal adhesion and electrical contact continuity, which will be reported. The results obtained are highly promising and pave the way towards the processing of ultrasensitive strain microsensors on MEMS structures, as well as their great potential for AFM scanning probe operations. [less ▲]

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See detailPerspectives on multilingualism and multilingual literacies from early childhood educators in Luxembourg
Kirsch, Claudine UL; Aleksic, Gabrijela UL; Bebić, Džoen Dominique UL et al

Scientific Conference (2021, September 04)

The pedagogies of multiliteracies and translanguaging (García et al., 2017) call for multiliteracies, but early childhood educators are often ensure of how to develop practices in one, let alone multiple ... [more ▼]

The pedagogies of multiliteracies and translanguaging (García et al., 2017) call for multiliteracies, but early childhood educators are often ensure of how to develop practices in one, let alone multiple languages. The development of literacy skills is often reduced to the isolated training of phonological awareness or the letters of the alphabet. By contrast, storytelling is a holistic approach which contributes to the development of language and literacy skills (Sénéchal & Lefevre, 2001). It can promote multilingualism if multilingual speakers are involved (Kirsch, 2018). This presentation reports on the perspectives on multiliteracies of educators in crèches in multilingual Luxembourg, where 63.7% of the 4-year-olds do not speak Luxembourgish at home. Multilingual education became mandatory in 2017, requesting educators to develop Luxembourgish, promote French and value home languages. The mix-method project Collaboration with parents and Multiliteracy in early Childhood Education aims to develop literacy practices in multiple languages and with multiple actors (parents, educators) through professional development in crèches. In this paper we report the findings of interviews and a survey sent to 700 educators in May 2020. The latter were asked to identify literacy practices (e.g. storytelling), language-promoting strategies, and translanguaging practices. The data are analysed with thematic analysis and descriptive statistical analysis. The findings will contribute to our understanding of current ideologies, pedagogies, and practices, and help identify issues and possible ways forward. [less ▲]

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See detailRules, Norms and Practices. A Comparative Study Exploring Disposal Practices and Facilities in Northern Europe
Kmec, Sonja UL; Nordh, Helena; House, Danielle et al

in Omega: Journal of Death and Dying (2021), 83(4),

We identify and analyse practices and management regimes around burial and handling of ashes across eight case study towns within six Northern European countries. We analyse management of cemeteries and ... [more ▼]

We identify and analyse practices and management regimes around burial and handling of ashes across eight case study towns within six Northern European countries. We analyse management of cemeteries and crematoria gardens, majority practices and provision for minority communities, including various burial types, cremated remains, the re-use of graves, and costs for interments. Comparative data is drawn from analysis of national and local regulations, interviews with stakeholders, and observations at cemeteries and crematoria gardens. The findings show significant variation in national and local regulations and practices for burial and cremation particularly around the re-use of graves, handling of ashes and costs for grave space and cremation. We identify the opportunities and constraints of these variations in terms of accessibility, diversity and equality; and argue for national directions to avoid unequal treatment within nations. Furthermore, we stress the importance of a liberal and inclusive management of European cemeteries and crematoria gardens. [less ▲]

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See detail„Raum für Mehrsprachigkeit geben!“
Heinzel, Friederike; Schüler, Liz; Kirsch, Claudine UL et al

in Die Grundschulzeitschrift (2021)

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See detailAutomatic Diagnosis of Bipolar Disorder Using Optical Coherence Tomography Data and Artificial Intelligence
Sanchez-Morla, Eva M.; Fuentes, Juan L.; Miguel-Jimenez et al

in Journal of Personalized Medicine (2021)

Background: The aim of this study is to explore an objective approach that aids the diagnosis of bipolar disorder (BD), based on optical coherence tomography (OCT) data which are analyzed using artificial ... [more ▼]

Background: The aim of this study is to explore an objective approach that aids the diagnosis of bipolar disorder (BD), based on optical coherence tomography (OCT) data which are analyzed using artificial intelligence. Methods: Structural analyses of nine layers of the retina were analyzed in 17 type I BD patients and 42 controls, according to the areas defined by the Early Treatment Diabetic Retinopathy Study (ETDRS) chart. The most discriminating variables made up the feature vector of several automatic classifiers: Gaussian Naive Bayes, K-nearest neighbors and support vector machines. Results: BD patients presented retinal thinning affecting most layers, compared to controls. The retinal thickness of the parafoveolar area showed a high capacity to discriminate BD subjects from healthy individuals, specifically for the ganglion cell (area under the curve (AUC) = 0.82) and internal plexiform (AUC = 0.83) layers. The best classifier showed an accuracy of 0.95 for classifying BD versus controls, using as variables of the feature vector the IPL (inner nasal region) and the INL (outer nasal and inner inferior regions) thickness. Conclusions: Our patients with BD present structural alterations in the retina, and artificial intelligence seem to be a useful tool in BD diagnosis, but larger studies are needed to confirm our findings. [less ▲]

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See detailFrom language policy to educational practices: early multilingual education in Luxembourg
Seele, Claudia; Kirsch, Claudine UL

Poster (2021, August 17)

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See detailCreativity in Humans, Robots, Humbots
Lubart, Todd; Esposito, Dario; Gubenko, Alla UL et al

in Creativity: Theories – Research – Applications (2021), 8(1),

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See detailREPORT OF DATA SOURCES
Wang, Xin Lin UL; Blanco, Braulio UL; Brorsson, Mats Hakan UL

Report (2021)

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See detailProbabilisitic limit theorems and the geometry of random fields
Notarnicola, Massimo UL

Doctoral thesis (2021)

The topics presented in this thesis lie at the interface of probability theory and stochastic geometry, with emphasis on the asymptotic study of geometric objects associated with Gaussian random fields ... [more ▼]

The topics presented in this thesis lie at the interface of probability theory and stochastic geometry, with emphasis on the asymptotic study of geometric objects associated with Gaussian random fields defined on manifolds. Such a research stream has been rapidly growing in past years, resulting in a number of developments focussing on local and global geometric quantities. Our principal aim is to discuss probabilistic methods allowing one to deal with the asymptotic fluctuations of volumes of zero sets (also called nodal sets) of Gaussian Laplace eigenfunctions as the eigenvalues diverge to infinity, with a particular focus on the models of Arithmetic Random Waves on the three-dimensional torus and Berry's Random Plane Wave on the two-dimensional Euclidean space. We prove universal variance estimates and non-Gaussian limit theorems for the zero sets of multiple independent Arithmetic Random Waves, complementing several related works in the literature. Our analysis for this builds on an abstract cancellation result applicable to the setting of Gaussian Laplace eigenfunctions on manifolds, yielding in particular a formal description of the so-called Berry's Cancellation Phenomenon observed in various models of random eigenfunctions. For the Berry Random Plane Wave, we prove spatial functional limit theorems for discretized and truncated versions of the nodal length indexed by rectangular domains. Such a contribution yields a basis for proving a fully general functional limit theorem for the nodal length and opens doors to a number of novel probabilistic limit theorems involving semi-local functionals of these nodal length processes. A common technique lying at the core of our arguments for dealing with these tasks is the asymptotic analysis of the Wiener-Itô chaos expansion in Hermite polynomials of such geometric quantities, often allowing one to reduce investigations on Wiener chaoses of lower order. In this context, we discuss properties of generalized Hermite polynomials with matrix arguments, appearing in multivariate statistics and the theory of zonal polynomials. We argue that this family of orthogonal polynomials is particularly effective for deducing chaotic expansions of random variables that are symmetric functionals in the eigenvalues of underlying Gaussian random matrices, notably appearing in different applications dealing with the geometry of random fields. We furthermore present a new characterization of matrix-Hermite polynomials as the eigenfunctions of a generalized Ornstein-Uhlenbeck semigroup on matrix spaces. The above mentioned probabilistic limit theorems originate from the systematic use of the Malliavin-Stein approach on Gaussian spaces, a collection of analytic statements allowing one to deduce probabilistic limit theorems by means of variational techniques. Such a series of results typically emerges from the combination of Stein's method for probabilistic approximations and Malliavin's infinite-dimensional differential calculus. At the end of this thesis, we present preliminary computations yielding variance estimates and Central Limit Theorems for certain non-linear functionals associated with the d-dimensional Berry Random field. Also, we discuss several aspects around optimal convergence rates within Gamma approximations of functionals of Gaussian fields. [less ▲]

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