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See detailGender differences in risk factors for suicidal behaviours in adolescents
van Duin, Claire UL; Catunda, Carolina UL; Heinz, Andreas UL et al

Scientific Conference (2018, December 07)

Introduction: As the second leading cause of death among young people suicide is a severe public health problem. Previous studies have indicated that risk factors for suicidal behaviours differ for males ... [more ▼]

Introduction: As the second leading cause of death among young people suicide is a severe public health problem. Previous studies have indicated that risk factors for suicidal behaviours differ for males and females, although it remains uncertain whether gender predicts suicidal behaviors. The 2014 HBSC study in Luxembourg has gathered data on the suicidal ideation sequence in adolescents and can contribute to these issues. Purpose: The objective of this study was to examine gender differences within the risk factors for suicidal behaviours within the adolescent population of Luxembourg. Materials and Methods: Data on suicidal ideation among adolescents was collected through written survey. Data from secondary school students aged 12 to 18 was used (N=5595). Bivariate logistic regressions were conducted in order to identify risk factors for the dependent variables of “sadness”, “considering suicide”, “planning suicide” and “suicide attempt” in the last twelve months. Subsequently, multivariate logistic regressions were performed split by gender. 24 independent variables were included in the models. Results: The three significant variables that added most to the models for “sadness” and “suicide attempt” are named. For boys, the odds for sadness were impacted by the number of health complaints (OR: 1.4 for each additional health complaint; CI: 1.4-1.6), life satisfaction (OR: 1.2 for each additional unit; CI: 1.2-1.3) and body image (OR: 1.6 for too thin; CI: 1.1-2.3; OR: 1.7 for too fat; CI: 1.3-2.3). For girls, the variables were the number of health complaints (OR: 1.4; CI: 1.3-1.4), life satisfaction (OR: 1.3; CI: 1.2-1.4) and sexual abuse (OR: 2.5; CI: 2.0-3.1). Considering suicide attempts, for boys the odds were impacted by the physical fighting (OR: 2.9 for 4 fights or more; CI: 1.5-5.5), life satisfaction (OR: 1.2; CI: 1.3-2.1) and substance use (OR: 1.7; CI: 1.3-2.1). For girls, the number of health complaints (OR: 1.3, CI: 1.2-1.4), life satisfaction (OR: 1.3; CI: 1.2-1.4) and type of school (OR: 3.7 for secondary technique; CI: 2.1-5.0) impacted the odds. Conclusion: This study has indicated that differences in risk factors between the genders increase as the severity of suicidal behavior increases. This highlights the need for distinct strategies for the prevention of suicide behaviours that are suitable for the different genders, and their respective risk factors. [less ▲]

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Peer Reviewed
See detailSuicide Prevention in Luxembourg: Using the HBSC Symptom Checklist as an Alternative Tool for Screening
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Poster (2018, December 07)

Introduction: Suicide is one of the leading causes of death of young people and as such, screening for suicidal ideation is a major public health concern. However, there is fear that exposure to suicide ... [more ▼]

Introduction: Suicide is one of the leading causes of death of young people and as such, screening for suicidal ideation is a major public health concern. However, there is fear that exposure to suicide-related content would encourage suicide attempt. This false idea is a great barrier to effectively screen. Hence, the need for tools without suicide content. Purpose: The goal of this study is to present a short tool that could be helpful for suicide screening and prevention. Materials and Methods: This study is based on the 2014 HBSC Luxembourg survey. A total of 5595 students aged from 12 to 18 years old in secondary school responded to a questionnaire translated to both French and German. Among others, it included the HBSC Symptom Checklist, a scale developed to measure eight health complaints (headache, abdominal pain, backache, feeling low, irritability, feeling nervous, sleeping difficulties and dizziness), as well as 4 questions asked in a logical sequence concerning sadness, suicide ideation, suicide planning and suicide attempt. Results: Multivariate Logistic Regression analyses with 24 potential indicators showed the number of health complaints as the most predictive indicator for suicide attempt (OR=1.248; C.I.: 1.175-1.325). Following, a significant ROC curve (area under the curve of 0.76; sensitivity=0.68 and specificity=0.73) and Youden Index (0.41) indicates the optimum cut-off at three complaints, with a predictive value of 17%. An alternative cut off point at four (sensitivity=0.57 and specificity=0.82; Youden Index of 0.39) has a predictive value of 21%. Conclusion: The HBSC Symptom Checklist seems to be a good predictor as each additional health complaint increases the risk of suicide attempt by 25%. In addition, it could be an alternative to traditional suicide screening measures, as its sensitivity, specificity and predictive values are similar to measures more commonly used, such as the Columbia Suicide Screen or the Beck Depression Inventory. Further work should be invested to validate the HBSC Symptom Checklist as a screening tool for suicide prevention. [less ▲]

Detailed reference viewed: 101 (13 UL)
See detailEin (un)möglicher Dialog? Überlegungen zum Verhältnis von Historikern und Schriftstellern in Ostbelgien
Brüll, Christoph UL

Scientific Conference (2018, December 07)

Künstlerische Freiheit versus Wahrheitsanspruch, Klio als Dichterin, Geschichtsschreibung als eine Form von literarischer Erzählung? Natürlich könnte auch die Historiographie zum heutigen Ostbelgien durch ... [more ▼]

Künstlerische Freiheit versus Wahrheitsanspruch, Klio als Dichterin, Geschichtsschreibung als eine Form von literarischer Erzählung? Natürlich könnte auch die Historiographie zum heutigen Ostbelgien durch die Brille dieser Debatten gelesen werden. Der durch eine Frage herausgehobene Gegenstand des Beitrags ist jedoch pragmatischer gefasst: er geht von der Beobachtung aus, dass zahlreiche literarische Publikationen über Ostbelgien bzw. aus der Feder von ostbelgischen Autoren eine Sicht auf die bewegte Vergangenheit der Region transportieren, dass dies jedoch nie zu einem Dialog zwischen den Schriftstellern und den Historikern in der Region geführt hat. Gefragt wird nach den Gründen für einen unmöglichen Dialog und den Bedingungen für eine mögliche Kommunikation. Dazu werden einerseits ausgewählte Schriften und öffentliche Interventionen (vor allem in den regionalen Medien) bekannter ostbelgischer Autoren auf ihr Geschichtsbild untersucht, andererseits jedoch auch – durchaus in der Form der Selbstbeobachtung – die Mobilisierung literarischer Erzeugnisse durch die historische Forschung analysiert. Überprüft werden soll zudem, inwiefern generationelle Faktoren als Erklärung für die Ausgangshypothese ausgemacht werden können. In einem letzten Schritt sollen dann Überlegungen angestellt werden, wie ein Dialog hergestellt werden könnte. Dass hierbei den Polen Öffnung und identitärer Rückzug eine bedeutende Rolle zukommt, überrascht nicht, macht jedoch die derzeitige Abwesenheit von Dialog und Auseinandersetzung umso erklärungsbedürftiger. [less ▲]

Detailed reference viewed: 46 (5 UL)
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: 117 (11 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: 50 (2 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: 63 (2 UL)
Peer Reviewed
See detailThe Empirical Saddlepoint Estimator
Holcblat, Benjamin UL; Sowell, Fallaw

Scientific Conference (2018, December 04)

Detailed reference viewed: 15 (1 UL)
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Peer Reviewed
See detailA Discrete-Continuous Method for Predicting Thermochemical Phenomena in a Cement Kiln and Supporting Indirect Monitoring
Copertaro, Edoardo UL; Estupinan Donoso, Alvaro Antonio UL; Peters, Bernhard UL

in Engineering Journal (2018), 22(6), 165-183

Thermochemical phenomena involved in cement kilns are still not well understood because of their complexity, besides technical difficulties in achieving direct measurements of critical process variables ... [more ▼]

Thermochemical phenomena involved in cement kilns are still not well understood because of their complexity, besides technical difficulties in achieving direct measurements of critical process variables. This article addresses the problem of their comprehensive numerical prediction. The presented numerical model exploits Computational Fluid Dynamics and Finite Difference Method approaches for solving the gas domain and the rotating wall, respectively. The description of the thermochemical conversion and movement of the powder particles is addressed with a Lagrangian approach. Coupling between gas, particles and the rotating wall includes momentum, heat and mass transfer. Three-dimensional numerical predictions for a full-size cement kiln are presented and they show agreement with experimental data and benchmark literature. The quality and detail of the results are believed to provide a new insight into the functioning of a cement kiln. Attention is paid to the computational burden of the model and a methodology is presented for reducing the time-to-solution and paving the way for its exploitation in quasireal-time, indirect monitoring. [less ▲]

Detailed reference viewed: 93 (4 UL)
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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: 95 (12 UL)
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See detailJewish responses to anti-Semitism in Paris and London in the late 1930s as European Jewish political history
Zaagsma, Gerben UL

in Bajohr, Frank; Pohl, Dieter (Eds.) Right-Wing Politics and the Rise of Antisemitism in Europe 1935-1941 (2018)

This article compares Jewish responses to antisemitism in Paris and London in the late 1930s, when antisemitism was on the rise in both France and the United Kingdom. There were striking similarities in ... [more ▼]

This article compares Jewish responses to antisemitism in Paris and London in the late 1930s, when antisemitism was on the rise in both France and the United Kingdom. There were striking similarities in these responses, yet local contexts and circumstances dominate the historiographies of both cases. The main aim of this article, then, is not so much to offer new insights into the individual cases (both of which have been abundantly analyzed in historical research), but rather to fill a gap by examining the broader factors that account for these similarities. On the one hand, the article examines the nature of Jewish self-identification in the post-Emancipation era and its effects on the political cultures, practices, and identifications of the actors that were involved; on the other, it explores the way in which these practices were also shaped by migration and transnational aspects. Ultimately, this case study will argue for a comparative and transnational approach to Jewish political history in order to arrive at a better understanding of its diverse configurations and permutations. [less ▲]

Detailed reference viewed: 80 (13 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 ▲]

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See detailA Memory-Based Label Propagation Algorithm for Community Detection
Fiscarelli, Antonio Maria UL; Brust, Matthias R. UL; Danoy, Grégoire UL et al

in Aiello, Luca Maria; Cherifi, Chantal; Cherifi, Hocine (Eds.) et al Complex Networks and Their Applications VII (2018, December 02)

The objective of a community detection algorithm is to group similar nodes in a network into communities, while increasing the dis- similarity between them. Several methods have been proposed but many of ... [more ▼]

The objective of a community detection algorithm is to group similar nodes in a network into communities, while increasing the dis- similarity between them. Several methods have been proposed but many of them are not suitable for large-scale networks because they have high complexity and use global knowledge. The Label Propagation Algorithm (LPA) assigns a unique label to every node and propagates the labels locally, while applying the majority rule to reach a consensus. Nodes which share the same label are then grouped into communities. Although LPA excels with near linear execution time, it gets easily stuck in local optima and often returns a single giant community. To overcome these problems we propose MemLPA, a novel LPA where each node imple- ments memory and the decision rule takes past states of the network into account. We demonstrate through extensive experiments on the Lancichinetti-Fortunato-Radicchi benchmark and a set of real-world net- works that MemLPA outperforms most of state-of-the-art community detection algorithms. [less ▲]

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See detailOsiris: Hunting for Integer Bugs in Ethereum Smart Contracts
Ferreira Torres, Christof UL; Schütte, Julian; State, Radu UL

in 34th Annual Computer Security Applications Conference (ACSAC ’18), San Juan, Puerto Rico, USA, December 3-7, 2018 (2018, December)

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed ... [more ▼]

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed once deployed to the blockchain. They typically implement the business logic of distributed apps and carry billions of dollars worth of coins. In that respect, it is imperative that smart contracts are correct and have no vulnerabilities or bugs. However, research has identified different classes of vulnerabilities in smart contracts, some of which led to prominent multi-million dollar fraud cases. In this paper we focus on vulnerabilities related to integer bugs, a class of bugs that is particularly difficult to avoid due to some characteristics of the Ethereum Virtual Machine and the Solidity programming language. In this paper we introduce Osiris – a framework that combines symbolic execution and taint analysis, in order to accurately find integer bugs in Ethereum smart contracts. Osiris detects a greater range of bugs than existing tools, while providing a better specificity of its detection. We have evaluated its performance on a large experimental dataset containing more than 1.2 million smart contracts. We found that 42,108 contracts contain integer bugs. Be- sides being able to identify several vulnerabilities that have been reported in the past few months, we were also able to identify a yet unknown critical vulnerability in a couple of smart contracts that are currently deployed on the Ethereum blockchain. [less ▲]

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See detailPhase-field predictive model for setting of fresh self-compacting concrete
Huang, Haiqin UL; Zilian, Andreas UL

in Proceedings in Applied Mathematics and Mechanics (2018), 18(1),

The initial setting of fresh concrete is mainly caused by the dissolution of cement grains and the precipitation of calcium-silicate-hydrates during cement hydration. Progressing hydration drives the ... [more ▼]

The initial setting of fresh concrete is mainly caused by the dissolution of cement grains and the precipitation of calcium-silicate-hydrates during cement hydration. Progressing hydration drives the transition from a dense suspension to a porous solid phase. Fresh mixture of self-compacting concrete (SCC) can be considered as a phase-changing multi-component material and can be described as a continuum at the macro scale, interacting with a set of transport-reaction-diffusion processes which in turn are driven by phenomena at the level of the microstructure. This contribution focuses on a predictive model for the setting of fresh SCC where the liquid-solid phase transition is captured by a phase-field variable using the Ginzburg-Landau type free energy function. Hydration-related chemical reactions together with heat and mass transfer are volume coupled with the mechanical behaviour and determined by the environmental conditions. The weak form of the predictive model is discretised using the finite element method and implemented with the FEniCS computational framework. [less ▲]

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See detailLa sémiotique visuelle naissante : Greimas et sa postérité
Colas-Blaise, Marion UL

in La Part de l'Oeil (2018), (32), 275-295

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See detailLa fiducie et la structuration des fonds d'investissement de droit français
Riassetto, Isabelle UL; Storck, Michel

in Mélanges en l'honneur du professeur Claude Witz (2018)

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See detailDéfis et pratiques dans l’établissement de l’identité des demandeurs lors des processus migratoires
Sommarribas, Adolfo UL; Coda, Nicolas UL; Nienaber, Birte UL

Article for general public (2018)

La note de synthèse présente les principaux résultats de l’étude réalisée en 2017 par le Point de contact Luxembourgeois du Réseau Européen des Migrations intitulée : « Défis et pratiques dans ... [more ▼]

La note de synthèse présente les principaux résultats de l’étude réalisée en 2017 par le Point de contact Luxembourgeois du Réseau Européen des Migrations intitulée : « Défis et pratiques dans l’établissement de l’identité des demandeurs lors des processus migratoires ». Cette étude vise à présenter un aperçu des principaux défis auxquels les autorités compétentes au Luxembourg sont confrontées lors de l’établissement et de la vérification de l’identité des ressortissants de pays-tiers dans le cadre des différentes procédures de migration (asile, retour, migration légale) ainsi que des pratiques mises en œuvre pour relever ces défis. Cette note se base essentiellement sur les informations recueillies jusqu’en juillet 2017 et n’englobe donc que peu d’évolutions qui ont pu se produire après cette date. [less ▲]

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See detailPourquoi la microfinance n’a pas éradiqué la pauvreté?
Leon, Florian UL

Article for general public (2018)

Detailed reference viewed: 26 (0 UL)