University of Luxembourg

About: University of Luxembourg is a education organization based out in Luxembourg, Luxembourg. It is known for research contribution in the topics: Population & European union. The organization has 4744 authors who have published 22175 publications receiving 381824 citations.

Website Fingerprinting at Internet Scale

Abstract: The website fingerprinting attack aims to identify the content (i.e., a webpage accessed by a client) of encrypted and anonymized connections by observing patterns of data flows such as packet size and direction. This attack can be performed by a local passive eavesdropper – one of the weakest adversaries in the attacker model of anonymization networks such as Tor. In this paper, we present a novel website fingerprinting attack. Based on a simple and comprehensible idea, our approach outperforms all state-of-the-art methods in terms of classification accuracy while being computationally dramatically more efficient. In order to evaluate the severity of the website fingerprinting attack in reality, we collected the most representative dataset that has ever been built, where we avoid simplified assumptions made in the related work regarding selection and type of webpages and the size of the universe. Using this data, we explore the practical limits of website fingerprinting at Internet scale. Although our novel approach is by orders of magnitude computationally more efficient and superior in terms of detection accuracy, for the first time we show that no existing method – including our own – scales when applied in realistic settings. With our analysis, we explore neglected aspects of the attack and investigate the realistic probability of success for different strategies a real-world adversary may follow.

The Palgrave Handbook of Childhood Studies

Abstract: List of Figures and Tables Notes on Contributors Introduction: Why Social Studies of Childhood? J.Qvortrup, W.A.Corsaro & M-S.Honig PART I: CONCEPTS OF CHILDHOOD STUDIES Childhood as Structural Form J.Qvortrup Agency A.James Child Development and Development of Childhood M.Woodhead How is the Child Constituted in Childhood Studies? M-S.Honig Method and Methodology in Childhood Research A.Lange & J.Mierendorff PART II: HISTORICAL AND SOCIO-ECONOMIC CONTEXTS OF CHILDHOOD The Evolution of Childhood in Western Europe c. 1400-1750 H.Hendrick Transitions to Modernity J.Gillis Institutionalization as a Secular Trend H.Zeiher Pluralization of Family Forms A-M.Jensen PART III: GENERATIONAL RELATIONS Generational Order L.Alanen Generational Relations at Family Level B.Mayall Children, Generational Relations and Intergenerational Justice T.Olk Collective Identities H.Hengst PART IV: CHILDREN'S EVERYDAY LIVES/THE LOCAL FRAMEWORK Children's Bodies L.Fingerson Policies in Early Childhood Education and Care: Potentialities for Agency, Play and Learning G.Dahlberg Localities: A Holistic Frame of Reference for Appraising Social Justice in Children's Lives J.McKendrick Children as Problems, Problems of Children K.Rosier Childhood: Leisure, Culture, and Peers I.Frones PART V: CHILDREN'S PRACTICE - CHILDREN AS PARTICIPANTS From Child Labour to Working Children's Movement O.Nieuwenhuys Peer Cultures W.A.Corsaro Play and Games A-C.Evaldsson Leisure Time and Cultural Activities I.Frones Children as Consumers D.Cook Children and Television D.Buckingham Children and Digital Media: Online, On Site, On the Go K.Drotner PART VI: CHILDREN'S RIGHTS AND PLACE IN THE WORLD Children's Rights as Human Rights: Reading the UNCRC M.Freeman Interests in and Responsibility for Children and their Life Worlds D.Buhler-Niederberger & H.Sunker Transnational Mobilities and Childhoods A.Bailey Closing the Gap between Rights and the Realities of Children's Lives N.H.Kaufman & I.Rizzini Author Index Subject Index

Observation of room-temperature polar skyrmions

Abstract: Complex topological configurations are fertile ground for exploring emergent phenomena and exotic phases in condensed-matter physics. For example, the recent discovery of polarization vortices and their associated complex-phase coexistence and response under applied electric fields in superlattices of (PbTiO3)n/(SrTiO3)n suggests the presence of a complex, multi-dimensional system capable of interesting physical responses, such as chirality, negative capacitance and large piezo-electric responses1-3. Here, by varying epitaxial constraints, we discover room-temperature polar-skyrmion bubbles in a lead titanate layer confined by strontium titanate layers, which are imaged by atomic-resolution scanning transmission electron microscopy. Phase-field modelling and second-principles calculations reveal that the polar-skyrmion bubbles have a skyrmion number of +1, and resonant soft-X-ray diffraction experiments show circular dichroism, confirming chirality. Such nanometre-scale polar-skyrmion bubbles are the electric analogues of magnetic skyrmions, and could contribute to the advancement of ferroelectrics towards functionalities incorporating emergent chirality and electrically controllable negative capacitance.

The nasal and gut microbiome in Parkinson's disease and idiopathic rapid eye movement sleep behavior disorder

Abstract: Background Increasing evidence connects the gut microbiota and the onset and/or phenotype of Parkinson's disease (PD). Differences in the abundances of specific bacterial taxa have been reported in PD patients. It is, however, unknown whether these differences can be observed in individuals at high risk, for example, with idiopathic rapid eye movement sleep behavior disorder, a prodromal condition of α-synuclein aggregation disorders including PD. Objectives To compare microbiota in carefully preserved nasal wash and stool samples of subjects with idiopathic rapid eye movement sleep behavior disorder, manifest PD, and healthy individuals. Methods Microbiota of flash-frozen stool and nasal wash samples from 76 PD patients, 21 idiopathic rapid eye movement sleep behavior disorder patients, and 78 healthy controls were assessed by 16S and 18S ribosomal RNA amplicon sequencing. Seventy variables, related to demographics, clinical parameters including nonmotor symptoms, and sample processing, were analyzed in relation to microbiome variability and controlled differential analyses were performed. Results Differentially abundant gut microbes, such as Akkermansia, were observed in PD, but no strong differences in nasal microbiota. Eighty percent of the differential gut microbes in PD versus healthy controls showed similar trends in idiopathic rapid eye movement sleep behavior disorder, for example, Anaerotruncus and several Bacteroides spp., and correlated with nonmotor symptoms. Metagenomic sequencing of select samples enabled the reconstruction of genomes of so far uncharacterized differentially abundant organisms. Conclusion Our study reveals differential abundances of gut microbial taxa in PD and its prodrome idiopathic rapid eye movement sleep behavior disorder in comparison to the healthy controls, and highlights the potential of metagenomics to identify and characterize microbial taxa, which are enriched or depleted in PD and/or idiopathic rapid eye movement sleep behavior disorder. © 2017 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

Gesprächsanalytisches Transkriptionssystem 2 (GAT 2)

Abstract: This article presents a revised version of GAT, a transcription system first developed by a group of German conversation analysts and interactional linguists in 1998. GAT tries to follow as many principles and conventions of CA's Jeffersonstyle transcription as possible, yet proposes some conventions which are more compatible with linguistic and phonetic analyses of spoken language, especially for the representation of prosody in talk-in-interaction. After ten years of use by many reseachers in conversation and discourse analysis, it was time to revise the first version, against the background of past experience and in light of new necessities for the transcription of corpora arising from technological advances and methodological developments over recent years. This text presents the new GAT 2 transcription system with all its conventions. It gives detailed instructions on how to transcribe spoken talk on three levels of delicacy: minimal, basic and refined transcript versions. In addition, it briefly introduces a few tools that may be helpful for the user: the online tutorial GAT-TO and the transcription editing software FOLKER.