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See detailExtreme values, means, and inequality measurement
d'ambrosio, Conchita UL; Bossert, Walter; Kamaga, Kohei

in Review of Income and Wealth (in press)

We examine some ordinal measures of inequality that are familiar from the literature. These measures have a quite simple structure in that their values are determined by combinations of specific summary ... [more ▼]

We examine some ordinal measures of inequality that are familiar from the literature. These measures have a quite simple structure in that their values are determined by combinations of specific summary statistics such as the extreme values and the arithmetic mean of a distribution. In spite of their common appearance, there seem to be no axiomatizations available so far, and this paper is intended to fill that gap. In particular, we consider the absolute and relative variants of the range; the max-mean and the mean-min orderings; and quantile-based measures. In addition, we provide some empirical observations that are intended to illustrate that, although these orderings are straightforward to define, some of them display a surprisingly high correlation with alternative (more complex) measures. [less ▲]

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See detailResource Allocation for AF Relaying Wireless-Powered Networks with Nonlinear Energy Harvester
Nguyen, Tien-Tung; Nguyen, van Dinh UL; Pham, Quoc-Viet et al

in IEEE Communications Letters (in press)

This letter considers a relay-based wireless-powered communication network to assist wireless communication between a source and multiple users. In particular, the relay adopts a nonlinear energy model to ... [more ▼]

This letter considers a relay-based wireless-powered communication network to assist wireless communication between a source and multiple users. In particular, the relay adopts a nonlinear energy model to harvest energy from a power beacon and subsequently uses it for information transmission over timedivision multiple access. Aiming at the maximization of end-toend (e2e) sum throughput, we formulate a novel optimization problem that jointly optimizes the power and time fraction for energy and information transmission. For a simple yet efficient solution for the nonconvex problem, we first convert it to a more computationally tractable problem and then develop an iterative algorithm, in which closed-form solutions are obtained at each iteration. The effectiveness of our proposed approach is verified and demonstrated through simulation results. Moreover, the results reveal that the source should transmit with its maximum allowable power budget to obtain the optimal e2e sum throughput. [less ▲]

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See detailKilling Stubborn Mutants with Symbolic Execution
Titcheu Chekam, Thierry UL; Papadakis, Mike UL; Cordy, Maxime UL et al

in ACM Transactions on Software Engineering and Methodology (in press)

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See detailλ-DNA Through porous materials – Surface Enhanced Raman Scattering in a simple plasmonic nanopore
Hubarevich, Aliaksandr; Huang, Jian-An; Giovannini, Giorgia et al

in Journal of Physical Chemistry C (in press)

Engineered electromagnetic fields in plasmonic nanopores enable enhanced optical detection for single molecule sensing and sequencing. Here, a plasmonic nanopore prepared in a thick nanoporous film is ... [more ▼]

Engineered electromagnetic fields in plasmonic nanopores enable enhanced optical detection for single molecule sensing and sequencing. Here, a plasmonic nanopore prepared in a thick nanoporous film is used to investigate, by means of surface enhanced Raman spectroscopy, the interaction between the metallic surface of the pore and a long-chain double strand DNA molecule free to diffuse through the pore. We discuss how the matrix of the porous material can interact with the molecule thanks to: i) transient aspecific interactions between the porous surface and DNA; ii) diffusion; iii) thermal and optical forces exerted by the localized field in a metallic nanostructure on the DNA molecule. An interaction time up to tens of milliseconds enables to collect high signal-to-noise Raman signatures, allowing an easy label-free reading of information from the DNA molecule. Moreover, to increase the rate of detection, we tested a polymeric porous hydrogel placed beneath the solid-state membrane. The hydrogel enables a slowdown of the molecule diffusion time, thus increasing the number of detected interaction events by a factor 20. The analysis of the observed Raman peaks and their relative intensities, combined with theoretical simulations, allow to get further information on the process of translocation and on the folding state and orientation of the translocating molecule. Our results demonstrate temporary adsorption of the DNA molecule on the porous material during the translocation due to the diffusion force. Finally, we provide a qualitative evaluation of the nucleotides’ contents in the different groups of collected signal. The proposed approach can find interesting applications not only in DNA sensing and sequencing, but also on generic nanopore spectroscopy. [less ▲]

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See detailTechnological Experimentation Without Adequate Safeguards? Interoperable EU Databases and Access to the Multiple Identity Detector by SIRENE Bureaux
Quintel, Teresa Alegra UL; Dimitrova, Diana

in Hallinan, Dara; De Hert, Paul; Gutwirth, Serge (Eds.) et al CPDP Book 2020 (2021)

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See detailTackling educational inequalities using school effectiveness measures
Levy, Jessica UL; Mussack, Dominic UL; Brunner, Martin et al

Scientific Conference (2020, November 11)

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See detailLoad approximation for uncertain topologies in the low-voltage grid
Mouline, Ludovic UL; Cordy, Maxime UL; Le Traon, Yves UL

in 2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm) (2020)

Smart grids allow operators to monitor the grid continuously, detect occurring incidents, and trigger corrective actions. To perform that, they require a deep understanding of the effective situation ... [more ▼]

Smart grids allow operators to monitor the grid continuously, detect occurring incidents, and trigger corrective actions. To perform that, they require a deep understanding of the effective situation within the grid. However, some parameters of the grid may not be known with absolute confidence. Reasoning over the grid despite uncertainty needs the consideration of all possible states. In this paper, we propose an approach to enumerate only valid potential grid states. Thereby, we allow discarding invalid assumptions that poison the results of a given computation procedure. We validate our approach based on a real-world topology from the power grid in Luxembourg. We show that the estimation of cable load is negatively affected by invalid fuse state combinations, in terms of computation time and accuracy. [less ▲]

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See detailThe Framework of Security-Enhancing Friction: How UX Can Help Users Behave More Securely
Distler, Verena UL; Lenzini, Gabriele UL; Lallemand, Carine UL et al

in New Security Paradigms Workshop (2020)

A growing body of research in the usable privacy and security community addresses the question of how to best influence user behavior to reduce risk-taking.We propose to address this challenge by ... [more ▼]

A growing body of research in the usable privacy and security community addresses the question of how to best influence user behavior to reduce risk-taking.We propose to address this challenge by integrating the concept of User Experience (UX) into empirical usable privacy and security studies that attempt to change risk-taking behavior. UX enables us to study the complex interplay between user-related, system-related and contextual factors and provides insights into the experiential aspects underlying behavior change, including negative experiences. We first compare and contrast existing security-enhancing interventions (e.g., nudges, warnings, fear appeals) through the lens of friction. We then build on these insights to argue that it can be desirable to design for moments of negative UX in security-critical situations. For this purpose, we introduce the novel concept of security-enhancing friction, friction that effectively reduces the occurrence of risk-taking behavior and ensures that the overall UX (after use) is not compromised. We illustrate how security-enhancing friction provides an actionable way to systematically integrate the concept of UX into empirical usable privacy and security studies for meeting both the objectives of secure behavior and of overall acceptable experience. [less ▲]

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See detailBuilding up Explainability in Multi-layer Perceptrons for Credit Risk Modeling
Sharma, Rudrani; Schommer, Christoph UL; Vivarelli, Nicolas

in Sharma, Rudrani (Ed.) Building up Explainability in Multi-layer Perceptrons for Credit Risk Modeling (2020, October 09)

Granting loans is one of the major concerns of financial institutions due to the risks of default borrowers. Default prediction by the neural networks is a popular technique for credit risk modeling ... [more ▼]

Granting loans is one of the major concerns of financial institutions due to the risks of default borrowers. Default prediction by the neural networks is a popular technique for credit risk modeling. Neural networks generally offer the accurate predictions that help banks to prevent financial losses and grow their business by approving more creditworthy borrowers. Although neural networks are capable of capturing the complex, non-linear relationships between a large number of features and output, these models act as black boxes. This is a graduation project paper that is focused on loan default risk prediction by multi-layer perceptron neural network and building up explainability to some degree in the trained neural networks through sensitivity analysis. The architecture of a multi-layer perceptron neural network with the best result is used to help the credit-risk manager in explaining why an applicant is a defaulter or non-defaulter. The prediction of a trained multi-layer perceptron neural network is explained by mapping input features and target variables directly using a model-agnostic explanation as well as a modelspecific explanation. Lastly, a comparison is performed between two explanation methods. [less ▲]

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See detailKeynote lecture: The Hybrid Historian - Historical Research in the Digital Age
Zaagsma, Gerben UL

Presentation (2020, September 25)

In the past decade, we have witnessed a shift from technological determinism to more attention to the methodological and epistemological changes in historical research which the digital turn has brought ... [more ▼]

In the past decade, we have witnessed a shift from technological determinism to more attention to the methodological and epistemological changes in historical research which the digital turn has brought about. This talk will focus on how the practice of doing history has changed in the digital age against the background of broader historical developments in the so-called digital humanities. I will argue that, in many ways, hybridity, seen at its most basic level as the integration of 'traditional' and 'digital' approaches, is the new normal for most historians. However, when more broadly conceptualised as the integration of newly emerging tools, technologies, materials, and/or practices in historical research, it also becomes clear that hybridity has a long and often unacknowledged history that predates the advent of computers – analog and digital. Against this backdrop, the first part of my talk traces this unacknowledged history and the debates accompanying the (wo)man-machine encounter in the historical research process more generally. As I will argue, this encounter needs to be qualified according to its most elementary phases (data & information gathering, processing, analysis, and dissemination). Crucially, the speed, enthusiasm, and rate of the uptake of new technologies differs, and has always differed, significantly across these phases. In the second half of the talk, I will then offer a concrete example of these insights by using my research on the diaries of Anne Frank as a case study and will demonstrate the hybrid nature of today's historical research process, both as a reality and potentiality. Exploring the longue durée of the impact of new technologies on the practice of history is not to deny the specificity of the current moment but helps us to see how 'digital' has now come to affect the entire historical profession in ways unseen before. Indeed, technology has become inescapable, even if many historians refuse to acknowledge the fact and remain reluctant to embrace it. Yet, we can only truly ground our current 'digital' practices, and learn from past experiences and expertise, by contextualising and qualifying what is new and what is not. The real challenge for our profession now is to take a mental leap forward and be consciously hybrid, to acknowledge that 'digital' is not merely complementary but integral to the practice of doing history, and purposely reflect its implications. [less ▲]

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See detailTranslanguaging at school: students’ perspectives on using multiple languages
Degano, Sarah UL

Presentation (2020, September 25)

Numerous scholars advocate for translanguaging pedagogies to increase participation and learning opportunities for all students, in particular students with a migration background (Rosiers, Van Lancker ... [more ▼]

Numerous scholars advocate for translanguaging pedagogies to increase participation and learning opportunities for all students, in particular students with a migration background (Rosiers, Van Lancker, & Delarue, 2018). Conversely, critics argue that translanguaging can contribute to reiterate unequal participation dynamics and question the equitable access to curricular resources (Hamman, 2018). While most qualitative studies draw on observations of classroom practices of the teachers and/or the students, only few consider the students’ perspectives on these practices. The present paper aims to address this issue. While my doctoral project explores the translanguaging practices of four fourth-graders of different backgrounds and their development over time, this paper investigates their perspectives on translanguaging. From January to December 2018, I observed the students’ interactions with their peers and teachers in Years 4 and 5 and identified and recorded key events. Subsequently, selected events were shown to and discussed with the students. Findings based on recordings from discussions and stimulated recall interviews revealed, first, that translanguaging was the default mode of communication of all four students and was perceived as a common practice. Second, the newcomers reported that they translanguaged to communicate quicker and that translanguaging was particularly frequent in students who were not yet proficient language users. Similarly, students with more experience in the education system perceived translanguaging as an inferior practice and indicated using their home language as a scaffold with other students, but not with their teachers. The students’ self-monitoring connects to the classroom practices. [less ▲]

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See detailPituitary Tumor Transforming Gene 1 Orchestrates Gene Regulatory Variation in Mouse Ventral Midbrain During Aging
Gui, Yujuan UL; Thomas, Mélanie H.; Garcia, Pierre et al

in Frontiers in Genetics (2020)

Dopaminergic neurons in the midbrain are of particular interest due to their role in diseases such as Parkinson’s disease and schizophrenia. Genetic variation between individuals can affect the integrity ... [more ▼]

Dopaminergic neurons in the midbrain are of particular interest due to their role in diseases such as Parkinson’s disease and schizophrenia. Genetic variation between individuals can affect the integrity and function of dopaminergic neurons but the DNA variants and molecular cascades modulating dopaminergic neurons and other cells types of ventral midbrain remain poorly defined. Three genetically diverse inbred mouse strains – C57BL/6J, A/J, and DBA/2J – differ significantly in their genomes (∼7 million variants), motor and cognitive behavior, and susceptibility to neurotoxins. To further dissect the underlying molecular networks responsible for these variable phenotypes, we generated RNA-seq and ChIP-seq data from ventral midbrains of the 3 mouse strains. We defined 1000–1200 transcripts that are differentially expressed among them. These widespread differences may be due to altered activity or expression of upstream transcription factors. Interestingly, transcription factors were significantly underrepresented among the differentially expressed genes, and only one transcription factor, Pttg1, showed significant differences between all three strains. The changes in Pttg1 expression were accompanied by consistent alterations in histone H3 lysine 4 trimethylation at Pttg1 transcription start site. The ventral midbrain transcriptome of 3-month-old C57BL/6J congenic Pttg1–/– mutants was only modestly altered, but shifted toward that of A/J and DBA/2J in 9-month-old mice. Principle component analysis (PCA) identified the genes underlying the transcriptome shift and deconvolution of these bulk RNA-seq changes using midbrain single cell RNA-seq data suggested that the changes were occurring in several different cell types, including neurons, oligodendrocytes, and astrocytes. Taken together, our results show that Pttg1 contributes to gene regulatory variation between mouse strains and influences mouse midbrain transcriptome during aging. [less ▲]

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See detailInside the Trading Zone: Thinkering in a Digital History Lab
Fickers, Andreas UL; van der Heijden, Tim UL

in Digital Humanities Quarterly (2020), 14(3),

The goal of this article is to critically reflect on the practical and epistemological challenges of doing historical research in the digital age. The analysis is based on a case study of the Doctoral ... [more ▼]

The goal of this article is to critically reflect on the practical and epistemological challenges of doing historical research in the digital age. The analysis is based on a case study of the Doctoral Training Unit (DTU) “Digital History and Hermeneutics”, an interdisciplinary research and training programme that was established at the Luxembourg Centre for Contemporary and Digital History (C²DH) of the University of Luxembourg. The DTU is designed as interdisciplinary trading zone that applies the method of “thinkering” – the tinkering with technology combined with the critical reflection on the practice of doing digital history. Based on this case study, the article addresses the question of how to constitute an interdisciplinary trading zone in practice and how to situate this trading zone in physical working environments, like a Digital History Lab and shared office space. [less ▲]

Detailed reference viewed: 57 (1 UL)