Last 7 days
Bookmark and Share    
Peer Reviewed
See detailCannabis Use during Adolescence: An Overview in Luxembourg and in Comparison to other European Countries
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Scientific Conference (2018, December 06)

Introduction: Cannabis is the most widely consumed illegal drug worldwide. The use of cannabis is a risk factor for mental illnesses, but also for social problems such as lower educational attainment and ... [more ▼]

Introduction: Cannabis is the most widely consumed illegal drug worldwide. The use of cannabis is a risk factor for mental illnesses, but also for social problems such as lower educational attainment and the use of other drugs. Consumption is considered particularly harmful if it starts early in adolescence, if in a high-dose and if it continues on a regular basis. Purpose: This study aims to give an overview on adolescents’ cannabis consumption in Luxembourg (how often and when they started consuming cannabis) and in comparison with other European countries. Materials and Methods: In 2014, 3461 students in secondary school took part in the HBSC study. The questionnaire translated to both French and German. They answered, among other health related questions, about their cannabis use (30 days and lifetime prevalence), as well as when they started consuming it. Results: Two groups were formed: 15-16 and 17-18 years old. In the 15-16 group, 11.2% used cannabis in the past 30 days and 21.7% tried it at least once in their lives. In the age group of 17-18, 15.2% stated using it in the last month and 38% in lifetime. Regarding the use in the past 30 days split by gender, the prevalence for girls is 8.9% and 13.8% for boys (15-16 age group) and 10.6% and 20.1% respectively (17-18 year-olds). The lifetime prevalence for 15-16 years old is 18% for both girls and boys, higher than the 13% HBSC participant countries (mostly European) mean for girls and 17% for boys. Finally, about the age they first tried cannabis, 6.8% of boys and 5.3% of girls responded the age of 12 (or younger), a similar ascendant curve is found and the prevalence of 25% for boys is reached at the age of 14 years, as for girls it is at 14.2 years old. Conclusion: First, our results highlight the differences between the 30-day versus lifetime consumption, indicating the latter is much more widespread than the regular consumption. Secondly, the older the students are, the higher the proportion of cannabis users, for both boys and girls, with regular consumption being more frequent among boys. In addition, consumption in a lifetime in Luxembourg is higher than other Europeans countries. Finally, a quarter of consumers started at the age of 14 or younger. This data indicates not only that prevention programs still are in need, but they should start early. [less ▲]

Detailed reference viewed: 12 (1 UL)
See detailIdéation suicidaire – Les tendances et les groupes à risque chez les adolescents au Luxembourg
Catunda, Carolina UL

Conference given outside the academic context (2018)

Le suicide est l'une des principales causes de décès chez les jeunes et l'adolescence est une période à risque pour le développement des idées suicidaires. L’objectif de cette communication est de ... [more ▼]

Le suicide est l'une des principales causes de décès chez les jeunes et l'adolescence est une période à risque pour le développement des idées suicidaires. L’objectif de cette communication est de présenter les tendances et les groupes à risque chez les adolescents au Luxembourg. Les résultats montrent que le sexe, le niveau socioéconomique, la structure familiale, le type d'école, l'âge et le harcèlement, entre autres sont des variables associés aux idées et comportement suicidaires. [less ▲]

Detailed reference viewed: 11 (0 UL)
See detailArchives du Web, « le dur » à l’épreuve de la durée
Schafer, Valerie UL

Presentation (2018, December 04)

Avec 336 milliards de pages Web collectées depuis 1996, la fondation Internet Archive propose un voyage temporel dans la Toile du passé qui a de quoi impressionner le chercheur et n’a rien à envier à la ... [more ▼]

Avec 336 milliards de pages Web collectées depuis 1996, la fondation Internet Archive propose un voyage temporel dans la Toile du passé qui a de quoi impressionner le chercheur et n’a rien à envier à la masse de tweets récupérés par la Library of Congress suite à un accord avec Twitter en 2010. Au plan national aussi nos institutions d’archivage - la Bibliothèque nationale de France (BnF) et l’Institut national de l’audiovisuel (Ina), collectent des volumes impressionnants (plus de 20 milliards de tweets archivés à la suite des attentats de novembre 2015 par l’Ina), invitant les chercheurs à penser des lectures et analyses outillées par des moyens informatiques afin d’approcher ces masses de données. Après avoir montré dans quelle mesure chercheurs et institutions d’archivage ont pu proposer un virage vers la lecture distante en matière d’archives du Web, nous interrogerons les enjeux et limites du traitement de ces sources nativement numériques par des méthodes computationnelles ou encore des outils relevant des humanités numériques. Entre archives enfermées dans les enceintes des bibliothèques en vertu du dépôt légal, opacité de certaines collectes, lacune des fonds et division du travail de collecte et d’analyse, singularité des corpus et difficulté à les pérenniser ou encore à les partager, il s’agira enfin de proposer des pistes à la question : « Faut-il et le cas échéant où durcir les analyses liées aux archives du Web ? ». [less ▲]

Detailed reference viewed: 26 (1 UL)
Full Text
Peer Reviewed
See detailNonlinear Model Predictive Control for Ecological Driver Assistance Systems in Electric Vehicles
Sajadi Alamdari, Seyed Amin UL; Voos, Holger UL; Darouach, Mohamed

in Robotics and Autonomous Systems (2018)

Detailed reference viewed: 15 (1 UL)
See detailHumanities Talk - radio interview by Danièle Wecker
van der Heijden, Tim UL

Diverse speeches and writings (2018)

"De Mediewëssenschaftler Tim van der Heijden huet am Kader vum Projet "Changing Platforms of Ritualized Memory Practices: The Cultural Dynamics of Home Movies" d'Geschicht vum Amateurfilm recherchéiert ... [more ▼]

"De Mediewëssenschaftler Tim van der Heijden huet am Kader vum Projet "Changing Platforms of Ritualized Memory Practices: The Cultural Dynamics of Home Movies" d'Geschicht vum Amateurfilm recherchéiert. Dëse Projet kuckt sech de sougenannten Home Movie vum Ufank vun der Kamera 1895 bis d'Opkomme vun der digitaler Medieplattform YouTube 2005 un. Dobäi huet de van der Heijden sech besonnesch op Phas vum technologesche Wiessel konzentréiert a konstatéiert, datt sech net nëmmen d'Instrument ännert mat deem de private Filmemacher schafft, mee esou guer d'Aart a Weis, wéi sech erënnert gëtt. D'Danièle Wecker ënnerhält sech mam Tim van der Heijden iwwer Verännerungen am private Film." [less ▲]

Detailed reference viewed: 22 (3 UL)
See detailQualitätskonstruktionen - Zur Verarbeitung divergierender Qualitätsanforderungen in der Jugendarbeit
Biewers, Sandra UL

Book published by Beltz Juventa (2018)

Formale Verfahren zur Sicherung von Qualität in sozialpädagogischen Organisationen stehen meist in einem engen Zusammenhang mit Fragen der Wirtschaftlichkeit. Ob sie auch in der pädagogischen Praxis ... [more ▼]

Formale Verfahren zur Sicherung von Qualität in sozialpädagogischen Organisationen stehen meist in einem engen Zusammenhang mit Fragen der Wirtschaftlichkeit. Ob sie auch in der pädagogischen Praxis nutzbringend zur Anwendung kommen und aus ihnen auch fachliche Innovationen hervorgehen, steht aber häufig in Zweifel. Das vorliegende Buch befasst sich mit dieser Frage aus der Perspektive der sozialpädagogischen Praxis. Vorgestellt wird eine empirische Studie, die mit Rekurs auf neoinstitutionalistische Theoriekonzepte untersucht, anhand welcher Strategien Fachkräfte in der Offenen Jugendarbeit die meist von staatlicher Seite definierten Qualitätskriterien und -regeln in ihrem Praxisalltag aufgreifen und ob bzw. inwiefern sie diese nach professionellen Anforderungen reinterpretieren und transformieren [less ▲]

Detailed reference viewed: 32 (5 UL)
Full Text
Peer Reviewed
See detailCollaborative Data Delivery for Smart City-oriented Mobile Crowdsensing Systems
Vitello, Piergiorgio; Capponi, Andrea UL; Fiandrino, Claudio UL et al

in IEEE Global Communications Conference (GLOBECOM), Abu Dhabi, UAE, 2018 (2018, December)

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing ... [more ▼]

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing infrastructures. In typical MCS systems, sensing tasks are allocated and reported on individual-basis. In this paper, we investigate on collaboration among users for data delivery as it brings a number of benefits for both users and sensing campaign organizers and leads to better coordination and use of resources. By taking advantage from proximity, users can employ device-to-device (D2D) communications like Wi-Fi Direct that are more energy efficient than 3G/4G technology. In such scenario, once a group is set, one of its member is elected to be the owner and perform data forwarding to the collector. The efficiency of forming groups and electing suitable owners defines the efficiency of the whole collaborative-based system. This paper proposes three policies optimized for MCS that are compliant with current Android implementation of Wi-Fi Direct. The evaluation results, obtained using CrowdSenSim simulator, demonstrate that collaborative-based approaches outperform significantly individual-based approaches. [less ▲]

Detailed reference viewed: 64 (9 UL)
Full Text
Peer Reviewed
See detailSuccessive convex approximation algorithms for sparse signal estimation with nonconvex regularizations
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

in IEEE Journal of Selected Topics in Signal Processing (2018), 12(6), 1-19

Detailed reference viewed: 89 (10 UL)
Full Text
Peer Reviewed
See detailKnowledge Graph-based Core Concept Identification in Learning Resources
Manrique, Rubén; Grevisse, Christian UL; Mariño, Olga et al

in 8th Joint International Conference, JIST 2018, Awaji, Japan, November 26–28, 2018, Proceedings (2018, December)

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support ... [more ▼]

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support systems. We present a set of strategies for core concept identification on the basis of a semantic representation built using the open and available knowledge in the so-called Knowledge Graphs (KGs). Different unsupervised weighting strategies, as well as a supervised method that operates on the semantic representation, were implemented for core concept identification. In order to test the effectiveness of the proposed strategies, a human-expert annotated dataset of 96 learning resources extracted from MOOCs was built. In our experiments, we show the capacity of the semantic representation for the core-concept identification task as well as the superiority of the supervised method. [less ▲]

Detailed reference viewed: 310 (4 UL)
Full Text
Peer Reviewed
See detailHydroxycoumarin OT-55 kills CML cells alone or in synergy with imatinib or Synribo: Involvement of ER stress and DAMP release
Mazumder, A; Lee, JY; Talhi, O et al

in Cancer Letters (2018)

We synthetized and investigated the anti-leukemic potential of the novel cytostatic bis(4-hydroxycoumarin) derivative OT-55 which complied with the Lipinski's rule of 5 and induced differential toxicity ... [more ▼]

We synthetized and investigated the anti-leukemic potential of the novel cytostatic bis(4-hydroxycoumarin) derivative OT-55 which complied with the Lipinski's rule of 5 and induced differential toxicity in various chronic myeloid leukemia (CML) cell models. OT-55 triggered ER stress leading to canonical, caspase-dependent apoptosis and release of danger associated molecular patterns. Consequently, OT-55 promoted phagocytosis of OT-55-treated CML cells by both murine and human monocyte-derived macrophages. Moreover, OT-55 inhibited tumor necrosis factor α-induced activation of nuclear factor-кB and produced synergistic effects when used in combination with imatinib to inhibit colony formation in vitro and Bcr-Abl+ patient blast xenograft growth in zebrafish. Furthermore, OT-55 synergized with omacetaxine in imatinib-resistant KBM-5 R cells to inhibit the expression of Mcl-1, triggering apoptosis. In imatinib-resistant K562 R cells, OT-55 triggered necrosis and blocked tumor formation in zebrafish in combination with omacetaxine. [less ▲]

Detailed reference viewed: 41 (0 UL)
Peer Reviewed
See detailClosed-Form Solution for Computationally Efficient Symbol-Level Precoding
Krivochiza, Jevgenij UL; Merlano Duncan, Juan Carlos UL; Andrenacci, Stefano UL et al

Scientific Conference (2018, December)

We present a convex optimization based Symbol-Level Precoding (SLP) for sum power minimization and propose the low-latency closed-form algorithm to find a heuristic solution to the optimization problem ... [more ▼]

We present a convex optimization based Symbol-Level Precoding (SLP) for sum power minimization and propose the low-latency closed-form algorithm to find a heuristic solution to the optimization problem. The technique exploits constructive interference at the multi-user MIMO systems and minimizes the sum power of the transmitted precoded signal per each symbol slot. As a result, the received signals gain extra Signal-to-Noise Ratio (SNR), which leads to the improved data rate and energy efficiency. We benchmark the low-complexity algorithm for solving the optimization technique against the conventional Fast Non-Negative Least Squares algorithm (NNLS). The demonstrated design of the SLP technique combined with the proposed closed-form algorithm has low computational complexity and fast processing time, which is applicable in low-latency high-throughput satellite communication systems. [less ▲]

Detailed reference viewed: 29 (0 UL)
Full Text
Peer Reviewed
See detailLes réseaux sociaux numériques d’avant …
Schafer, Valerie UL

in Le temps des Médias (2018), 31

CBBS, The Well, Fidonet, Geocities, DDS, Calvacom, the Minitel are some of the « virtual communities » and spaces, where, from the 1970s to the 1990s, the early adopters of computer-mediated ... [more ▼]

CBBS, The Well, Fidonet, Geocities, DDS, Calvacom, the Minitel are some of the « virtual communities » and spaces, where, from the 1970s to the 1990s, the early adopters of computer-mediated communications built digital social networks, which did not yet bear this name. They challenge our definition of social networks, invite us to consider the continuities and disruptions between these past experiences and those of today, but also the traces left by these communities, to better consider the future of our born-digital heritage. [less ▲]

Detailed reference viewed: 24 (1 UL)
See detailEn construction. La fabrique française d'Internet et du Web dans les années 1990
Schafer, Valerie UL

Book published by INA Editions (2018)

Cet ouvrage s’inscrit dans le cadre d’une histoire jeune et très contemporaine, celle d’Internet, du Web et des cultures numériques et explore leur fabrique dans les années 1990 en France. Cette recherche ... [more ▼]

Cet ouvrage s’inscrit dans le cadre d’une histoire jeune et très contemporaine, celle d’Internet, du Web et des cultures numériques et explore leur fabrique dans les années 1990 en France. Cette recherche, à la croisée de l’histoire des médias, de l’histoire de l’innovation, et de l’histoire sociale et culturelle, reflète les apports d’une approche française de l’histoire d’Internet et du Web. Matérialité et infrastructures, temporalités et trajectoires, espaces et territoires traversent les cinq chapitres du livre. Ils apportent des arguments au choix d’une analyse nationale d’un phénomène pourtant transnational, en s’intéressant à l’attribution des noms de domaine et à la francophonie au sein de la Toile, à la transition entre la culture Minitel et celle du Web, ou encore à la place d’un État qui passe du volontarisme et du monopole des télécommunications à la dérégulation et aux imaginaires des autoroutes puis de la société de l’information. Explorant les pratiques, difficultés, tâtonnements de la période et le tournant grand public du Web, on croise au cours de cette navigation des informaticiens, des entrepreneurs, des politiques, des passionnés de science-fiction, des militants, autant d’acteurs qui se confrontent, débattent, co-construisent. Ils vous invitent à les suivre dans un chantier entre « cathédrale et bazar », pour reprendre Eric Raymond, dont l’exotisme mais aussi l’actualité des débats ne cessent de nous frapper. Bienvenue dans le Cyberespace des années 1990 ! [less ▲]

Detailed reference viewed: 25 (1 UL)
Full Text
Peer Reviewed
See detailWeb History in Context
Schafer, Valerie UL; Thierry, Benjamin

in Brügger, Niels; Milligan, Ian (Eds.) The SAGE Handbook of Web History FIRST EDITION (2018)

The presence now of the Web in every area of life demands studies which constitute it simultaneously both as itself a contextualising object and as anchored in a context. Contextualising because today it ... [more ▼]

The presence now of the Web in every area of life demands studies which constitute it simultaneously both as itself a contextualising object and as anchored in a context. Contextualising because today it directly influences an infinite number of objects, which can no longer be studied without taking account of their echoes online. In transmedia dynamics in particular, we can see how the Web is increasingly becoming an ever-present backdrop to controversies, to the configuration of information and even to interpersonal relationships. Equally, the Web must find its own contextualisation, first of all – since we are historians – from a diachronic perspective. The first challenge is not to remain within the limits set by the technology itself. This twofold approach (the Web in context and the Web as context) suggests how focused we need to be on the construction of an ever-changing socio-technical reality – a return to a totalising, process-focused history which takes account of ongoing developments. We should resist the effects of any discourse tending to fix realities or establish, in hieratic or metonymic fashion, an image of ‘THE’ Web. The present analysis falls into three main sections, which interrogate, in turn, the diachronic or temporal contextualisation, the boundaries or spatial contextualisation, and finally collective and individual experiences of the Web. [less ▲]

Detailed reference viewed: 23 (1 UL)
Full Text
See detailLa gouvernance, un enjeu transversal d’Internet au numérique
Musiani, Francesca; Schafer, Valerie UL

in Enjeux numériques (2018), (4),

De la gouvernance d’Internet à celle du Web mais aussi de ses archives, en passant par la gouvernance de Wikipedia, de l’Internet des objets, ou encore, par la neutralité du Net, cette contribution ... [more ▼]

De la gouvernance d’Internet à celle du Web mais aussi de ses archives, en passant par la gouvernance de Wikipedia, de l’Internet des objets, ou encore, par la neutralité du Net, cette contribution témoigne de multiples déclinaisons. Si la gouvernance peut être pensée au pluriel et à plusieurs échelles, de la donnée au « réseau des réseaux », dans cet article, nous montrerons aussi la nuance qu’apporte la notion de « gouvernementalité » pour saisir, en théorie comme en pratique, les manières de faire et d’agir dans les environnements numériques. [less ▲]

Detailed reference viewed: 17 (3 UL)
Full Text
See detailVom ersten Kongress der Gesellschaft für Musikerziehung in Prag 1936 bis 2016
Sagrillo, Damien UL; Brusniak, Friedhelm

Book published by Margraf (2018)

Vom 18. bis 20. November 2016 fand an der Universität Würzburg in Zusammenarbeit mit der Internationalen Leo-Kestenberg-Gesellschaft (IKG) ein von der Deutschen Forschungsgemeinschaft (DFG) unterstützter ... [more ▼]

Vom 18. bis 20. November 2016 fand an der Universität Würzburg in Zusammenarbeit mit der Internationalen Leo-Kestenberg-Gesellschaft (IKG) ein von der Deutschen Forschungsgemeinschaft (DFG) unterstützter internationaler Kongress zum Thema Vom ersten Internationalen Kongress der Gesellschaft für Musikerziehung in Prag 1936 bis 2016 – Ein Beitrag zum Diskurs über »cultural heritage« statt. Die hier in Auswahl publizierten Vorträge folgen dem Programm des Würzburger Kongresses, an dem Referenten aus Deutschland, Frankreich, Luxemburg, Tschechien und der Schweiz sowie aus Israel und Kanada teilnahmen. Die Autoren der Beiträge für den vorliegenden Band sind Friedhelm Brusniak, Karl Heinrich Ehrenforth, Andreas Eschen, Mechtild Fuchs, Jiřina Jiřičková/Jan Prchal, Helmke Jan Keden, Philip A. Maxwell, Franz Metz, Christoph Richter, Thomas Rösch, Anna-Christine Rhode-Jüchtern, Damien Sagrillo, Dietmar Schenk, Josef Schuster, Pascal Terrien/Angelika Güsewell/Rym Vivien. [less ▲]

Detailed reference viewed: 17 (1 UL)
Full Text
Peer Reviewed
See detailMusikalische Bildung. Deutsche, französische und ungarische Traditionen im Überblick
Sagrillo, Damien UL

in Brusniak, Friedhelm; Sagrillo, Damien (Eds.) Vom ersten Kongress der Gesellschaft für Musikerziehung in Prag 1936 bis 2016 (2018)

Detailed reference viewed: 22 (1 UL)
Full Text
Peer Reviewed
See detailScience and Technology Studies Approaches to Web History
Musiani, Francesca; Schafer, Valerie UL

in Brügger, Niels; Milligan, Ian (Eds.) The SAGE Handbook of Web History FIRST EDITION (2018)

This chapter seeks to show the value of a relational, practice-oriented approach – what in STS vocabulary is called ‘unpacking black boxes’, or doing a sociology ‘of assemblages’. The chapter examines how ... [more ▼]

This chapter seeks to show the value of a relational, practice-oriented approach – what in STS vocabulary is called ‘unpacking black boxes’, or doing a sociology ‘of assemblages’. The chapter examines how this approach can shed light on the hybrid mobilizations of innovators, consumers, users and entrepreneurs – alongside their creations and cultures – that have made the Web the complex socio-technical system it is today. [less ▲]

Detailed reference viewed: 22 (1 UL)
See detailBildungsungleichheiten im luxemburgischen Sekundarschulsystem aus zeitlicher Perspektive
Hadjar, Andreas UL; Fischbach, Antoine UL; Backes, Susanne

in University of Luxembourg, LUCET; Ministère de l’Éducation nationale, de l’Enfance et de la Jeunesse, SCRIPT (Eds.) Nationaler Bildungsbericht Luxemburg 2018 (2018)

Detailed reference viewed: 14 (1 UL)