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See detailLinear smoothed extended finite element method for fatigue crack growth simulations
Surendran, M; Natarajan, Sundararajan; Palani, G.S. et al

in Engineering Fracture Mechanics (2018), 206

In this paper, the recently proposed linear smoothed extended finite element method (LSmXFEM) is employed to simulate the fatigue crack growth. Unlike the conventional extended finite element method, the ... [more ▼]

In this paper, the recently proposed linear smoothed extended finite element method (LSmXFEM) is employed to simulate the fatigue crack growth. Unlike the conventional extended finite element method, the LSmXFEM does not require special numerical integration technique to integrate the terms in the stiffness matrix. The stress intensity factors (SIFs) are evaluated by using the domain form of the interaction integral technique. The fatigue crack growth rate is evaluated using the generalized Paris’ law in conjunction with the maximum hoop stress criterion. The robustness of the method is demonstrated with a few examples for which the results are available in the literature. Then, the fatigue crack growth from the numerical simulation is compared with the experimental investigations performed on CR5 grade cold formed steel. It is seen that the fatigue life and the crack path obtained from the proposed method is in close agreement with the experimental observation. [less ▲]

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See detailA survey: The usage of Augmented Reality in Industry
Gallala, Abir UL; Hichri, Bassem UL; Plapper, Peter UL

in Robotix-Academy Conference for Industrial Robotics 2018 (2018, November 01)

Human-Robot-Interaction technologies in industry 4.0 and modern manufacturing are more and more growing. Using off-line robot programming methods such as Augmented Reality (AR) could gain time and money ... [more ▼]

Human-Robot-Interaction technologies in industry 4.0 and modern manufacturing are more and more growing. Using off-line robot programming methods such as Augmented Reality (AR) could gain time and money as well as improve programming and repair tasks. This paper is a study of the use of AR in smart factories. [less ▲]

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See detailAn Approach to Incorporate Emotions in a Chatbot with Seq2Seq Model
Zheng, Yaqiong; Guo, Siwen UL; Schommer, Christoph UL

in Benelux Conference on Artificial Intelligence, ‘s-Hertogenbosch 8-9 November 2018 (2018, November)

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See detail3D Cultures of Parkinson's Disease‐Specific Dopaminergic Neurons for High Content Phenotyping and Drug Testing
Bolognin, Silvia UL; Fossépré, Marie; Qing, Xiaobing et al

in Advanced Science (2018)

Parkinson's disease (PD)‐specific neurons, grown in standard 2D cultures, typically only display weak endophenotypes. The cultivation of PD patient‐specific neurons, derived from induced pluripotent stem ... [more ▼]

Parkinson's disease (PD)‐specific neurons, grown in standard 2D cultures, typically only display weak endophenotypes. The cultivation of PD patient‐specific neurons, derived from induced pluripotent stem cells carrying the LRRK2‐G2019S mutation, is optimized in 3D microfluidics. The automated image analysis algorithms are implemented to enable pharmacophenomics in disease‐relevant conditions. In contrast to 2D cultures, this 3D approach reveals robust endophenotypes. High‐content imaging data show decreased dopaminergic differentiation and branching complexity, altered mitochondrial morphology, and increased cell death in LRRK2‐G2019S neurons compared to isogenic lines without using stressor agents. Treatment with the LRRK2 inhibitor 2 (Inh2) rescues LRRK2‐G2019S‐dependent dopaminergic phenotypes. Strikingly, a holistic analysis of all studied features shows that the genetic background of the PD patients, and not the LRRK2‐G2019S mutation, constitutes the strongest contribution to the phenotypes. These data support the use of advanced in vitro models for future patient stratification and personalized drug development. [less ▲]

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See detailFrustration inducing tasks as tools for assessing adolescent emotion regulation
Battistutta, Layla UL; Steffgen, Georges UL

Scientific Conference (2018, November)

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among ... [more ▼]

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among adolescents in experimental settings are needed, but so far potential differences between already existing frustration inducing tasks are not well understood. The aim of the present study was thus to compare the efficacy of two non-verbal distress tolerance tasks – the Behavioural Indicator of Resiliency to Distress (BIRD, Lejuez et al.), and the Mirror Tracing Persistence Task (MPTP; Strong et al., 2003), in inducing frustration in a sample of 72 adolescents between the ages of 11 and 16. Adolescents’ subjective, physiological and behavioural emotion responses were assessed via self-report (PANAS-C; Laurent et al., 1999), heart rate monitoring and persistence on the task respectively, and associated with their self-reported emotion regulation difficulties (DERS-SF, Gullone & Taffe, 2012) as well as strategy use during the task (ERQ-state; Egloff et al., 2006). Both tasks were found to be subjectively frustrating, as evidenced by significant differences between pre- and post- reported negative affect. Beyond the similar self-reported psychological distress for both tasks, stronger negative physiological and behavioural reactions were however found for the BIRD task with higher heart rates as well as a tendency towards a shorter persistence on this task. The emotional responses were found to be correlated with adolescents reported difficulties, above all with their reported impulsiveness. Adolescents’ strategy use of reappraisal and suppression did not differ between tasks. Due to the similar self-reported negative affect after both tasks, these findings validate the use of both tasks in an adolescent population. In addition, they highlight potential differences between tasks in terms of emotion responses. These discrepancies should be taken into account in further studies due to their implications for the interpretation of findings. [less ▲]

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See detailSchool Shootings
Böhmer, Matthias UL; Hale, Miriam-Linnea UL

Poster (2018, November)

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See detailDeformation-Based Abnormal Motion Detection using 3D Skeletons
Baptista, Renato UL; Demisse, Girum UL; Aouada, Djamila UL et al

in IEEE International Conference on Image Processing Theory, Tools and Applications (IPTA) (2018, November)

In this paper, we propose a system for abnormal motion detection using 3D skeleton information, where the abnormal motion is not known a priori. To that end, we present a curve-based representation of a ... [more ▼]

In this paper, we propose a system for abnormal motion detection using 3D skeleton information, where the abnormal motion is not known a priori. To that end, we present a curve-based representation of a sequence, based on few joints of a 3D skeleton, and a deformation-based distance function. We further introduce a time-variation model that is specifically designed for assessing the quality of a motion; we refer to a distance function that is based on such a model as~\emph{motion quality distance}. The overall advantages of the proposed approach are 1) lower dimensional yet representative sequence representation and 2) a distance function that emphasizes time variation, the motion quality distance, which is a particularly important property for quality assessment. We validate our approach using a publicly available dataset, SPHERE-StairCase2014 dataset. Qualitative and quantitative results show promising performance. [less ▲]

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See detailDer Bachelor ind Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder
Dujardin, Céline UL; Böwen, Petra UL; Flammang, Manou Laure UL

E-print/Working paper (2018)

Der Newsletter ist eine Fortführung der Publikation "Der Bachelor in Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder". Er wird vervollständigt durch die Daten neuen berufsbegleitenden ... [more ▼]

Der Newsletter ist eine Fortführung der Publikation "Der Bachelor in Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder". Er wird vervollständigt durch die Daten neuen berufsbegleitenden BSSE. Der Newsletter bilanziert die Bewerber- sowie die Studienverlaufsdaten mit den Praxisfeldern und den Bachelorarbeiten des Jahres 2017-2018 [less ▲]

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See detailEmploi et développement économique au sein de la Grande Région : développement économique différencié et impacts de l’emploi transfrontalier
Belkacem, Rachid; Dörrenbächer, Peter; Pigeron-Piroth, Isabelle UL

E-print/Working paper (2018)

Axé sur le thème du développement économique et de l’emploi, ce rapport se consacrera plus spécifiquement au développement économique différencié (entre les diverses composantes de la Grande Région) et ... [more ▼]

Axé sur le thème du développement économique et de l’emploi, ce rapport se consacrera plus spécifiquement au développement économique différencié (entre les diverses composantes de la Grande Région) et aux impacts de l’emploi transfrontalier. Il se base sur l’expertise géographique et socioéconomique de ses auteurs, intéressés aux questions transfrontalières et plus particulièrement au phénomène de travail frontalier. [less ▲]

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See detail#DHJewish - Jewish Studies in the Digital Age
Zaagsma, Gerben UL

in Medaon: Magazin für Jüdisches Leben in Forschung und Bildung (2018), 23

This article discusses the intersection of Jewish Studies and Digital Humanities (DH). It investigates the specific characteristics of Jewish Studies, in terms of both subject matter and sources, and ... [more ▼]

This article discusses the intersection of Jewish Studies and Digital Humanities (DH). It investigates the specific characteristics of Jewish Studies, in terms of both subject matter and sources, and reflects on how digital approaches can be harnessed to address them. What common digital challenges do Jewish Studies scholars face, if these can indeed be defined, and in what ways can the field benefit from developments in the area of DH? Even though Jewish Studies is arguably an umbrella term (as is DH), this article suggests that the field of Jewish Studies has several characteristics that are broadly shared by all the (sub-)disciplines that it incorporates. Conceptualising the encounter between Jewish Studies and DH is thus first and foremost about translating these characteristics into specific digital challenges. As will be argued, the key task is information retrieval and analysis from dispersed, multilingual and multiscriptual sources. [less ▲]

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See detailSymbol-Level Precoding Design Based on Distance Preserving Constructive Interference Regions
Haqiqatnejad, Alireza UL; Kayhan, Farbod UL; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2018), 66(22), 5817-5832

In this paper, we investigate the symbol-level precoding (SLP) design problem in the downlink of a multiuser multiple-input single-output (MISO) channel. We consider generic two-dimensional constellations ... [more ▼]

In this paper, we investigate the symbol-level precoding (SLP) design problem in the downlink of a multiuser multiple-input single-output (MISO) channel. We consider generic two-dimensional constellations with any shape and size, and confine ourselves to one of the main categories of constructive interference regions (CIR), namely, distance preserving CIR (DPCIR). We provide a comprehensive study of DPCIRs and derive several properties for these regions. Using these properties, we first show that any signal in a given DPCIR has a norm greater than or equal to the norm of the corresponding constellation point if and only if the convex hull of the constellation contains the origin. It is followed by proving that the power of the noise-free received signal in a DPCIR is a monotonic strictly increasing function of two parameters relating to the infinite Voronoi edges. Using the convex description of DPCIRs and their characteristics, we formulate two design problems, namely, the SLP power minimization with signal-to-interference-plus-noise ratio (SINR) constraints, and the SLP SINR balancing problem under max-min fairness criterion. The SLP power minimization based on DPCIRs can straightforwardly be written as a quadratic programming (QP). We derive a simplified reformulation of this problem which is less computationally complex. The SLP max-min SINR, however, is non-convex in its original form, and hence difficult to tackle. We propose alternative optimization approaches, including semidefinite programming (SDP) formulation and block coordinate descent (BCD) optimization. We discuss and evaluate the loss due to the proposed alternative methods through extensive simulation results. [less ▲]

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See detailAußerschulisches Lesen und Lesekompetenz Zum Zusammenhang zwischen den Deutsch- und Französisch- Lesekompetenzen von Neuntklässlerinnen und Neuntklässlern und ihren außerschulischen Lesegewohnheiten in Luxemburg.
Reichert, Monique UL; Krämer, Charlotte UL; Rivas, Salvador UL et al

Scientific Conference (2018, November)

In Luxemburg erreichen viele Jugendliche ein gutes Lesekompetenzniveau nicht nur in einer, sondern gleich in zwei Sprachen. Allerdings wird wiederholt darauf hingewiesen, dass die Lesekompetenzen in ... [more ▼]

In Luxemburg erreichen viele Jugendliche ein gutes Lesekompetenzniveau nicht nur in einer, sondern gleich in zwei Sprachen. Allerdings wird wiederholt darauf hingewiesen, dass die Lesekompetenzen in Luxemburg stark mit dem familiären Hintergrund der Schülerinnen und Schüler zusammenhängen. Die vorliegende Studie soll jedoch über die Darstellung der Zusammenhänge zwischen den Deutsch- und Französisch-Lesekompetenzen und Einflussfaktoren wie sozio-ökonomischem Hintergrund, Migrationsstatus und Muttersprache hinausgehen. In der Tat stellt sich die Frage, ob es Faktoren gibt, die sich positiv auf das Lesekompetenzniveau der Schülerinnen und Schüler auswirken und auf die sie – anders als bei diesen mittlerweile gut belegten Faktoren – selbst Einfluss nehmen können? Das Leseverhalten Jugendlicher stellt hierfür einen naheliegenden Ansatzpunkt dar. Somit wurden die Schülerinnen und Schüler während der ÉpStan 2016 nicht nur zu ihrem familiären, schulischen und persönlichen Hintergrund befragt, sondern erstmals auch zu ihrem außerschulischen Leseverhalten. Hierbei wurde erfasst, wie häufig sie in ihrer Freizeit Texte unterschiedlicher Art (z. B. Erzählungen, Sachtexte, Zeitungsartikel, Foreneinträge oder Emails) lesen, und in welchen Sprachen sie dies tun. Mittels verschiedener Regressionsanalysen wurde der familiäre Hintergrund der Jugendlichen, ihr Leseverhalten, sowie ihr Lesekompetenzniveau im Deutschen und Französischen zueinander in Bezug gesetzt. Die aus diesen Analysen hervorgehenden Ergebnisse belegen eindrücklich, dass neben dem familiären Hintergrund auch die Lesehäufigkeit und die Sprache, in der die Schülerinnen und Schüler üblicherweise lesen, von Bedeutung für das erreichte Lesekompetenzniveau sind. Darüber hinaus haben insbesondere die Textsorten, mit denen sich die Jugendlichen in ihrer Freizeit auseinandersetzen, entscheidenden Einfluss auf ihre Deutsch- und ihre Französisch-Lesekompetenz. Insbesondere die Häufigkeit, mit der Jugendliche angeben, narrative Texte (wie Geschichten, Romane oder Erzählungen) zu lesen, steht deutlich in positivem Zusammenhang mit ihrer Lesekompetenz in beiden Sprachen. Der Vortrag schließt mit einer Diskussion bezüglich der außerordentlich hohen Attraktivität von digitalen Textsorten bei Kindern und Jugendlichen, und den Möglichkeiten, diese Vielfalt an primär kommunikativ bzw. interaktiv ausgerichteten Lesematerialien als lebensnahe, pädagogische „Sprungbretter“ zu nutzen, mit deren Hilfe zukünftige Leserinnen und Leser an zunehmend komplexere Texte herangeführt werden könnten. [less ▲]

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See detailLa concurrence croissante entre banques et institutions de microfinance
Leon, Florian UL; Baraton, Pierrick

Article for general public (2018)

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See detailTransborder Access to e-Evidence by Law Enforcement Agencies: A first comparative view on the Commission's Proposal for a Regulation on a European Preservation/Production Order and accompanying Directive
Quintel, Teresa Alegra UL; Cole, Mark UL

in SSRN Electronic Journal (2018)

As communication nowadays commonly takes place via electronic means, the use of electronic evidence (e-evidence) is becoming a crucial element in criminal investigations. Due to the borderless nature of ... [more ▼]

As communication nowadays commonly takes place via electronic means, the use of electronic evidence (e-evidence) is becoming a crucial element in criminal investigations. Due to the borderless nature of the internet, many criminal investigations include a cross-border dimension and therefore, commonly require access to electronic data and evidence that are stored outside the territorial jurisdiction of the investigating authority. Since data are typically held by private companies that are often located in a different country than the investigator, law enforcement authorities (LEAs) are either dependent on the willingness of these service providers to cooperate on a voluntary basis, or to resort to existing legal procedures for obtaining the data for investigations. The relevant procedures under the current framework to access data stored outside the European Union is based on so-called Mutual Legal Assistance Treaties (MLATs), whereas judicial cooperation within the EU is, inter alia, governed by the Directive on the European Investigation Order in the form of the national transposition acts of the Member States. Because e-evidence is, due to its volatile nature, prone to modification and deletion, the timely acquisition of stored data is vital for LEAs. Therefore, informal cooperation between LEAs and private companies is a common method to obtain e-evidence, thereby bypassing the lengthy and often ineffective Mutual Legal Assistance (MLA) mechanisms. Such direct cooperation between law enforcement and private companies, which is commonly carried out on a unilateral basis, has led to a fragmented framework for the acquisition of data. Against this background, the European Commission, on 17 April 2018, proposed new rules on access to e-evidence, to secure and obtain preserved data faster and more effectively and to ensure that all providers that offer services in the EU are subject to the same obligations. Similar developments regarding the adoption of comparable legislative acts and instruments regarding direct law enforcement access to data stored by private companies take place elsewhere in Europe and beyond: The Council of Europe is currently preparing a 2nd Additional Protocol to the Budapest Convention on enhanced international cooperation, whereas in the U.S., the Clarifying Lawful Overseas Use of Data Act on rules for cross-border law enforcement investigations was enacted in March 2018. This contribution will address concerns regarding the role of private companies as ‘extended arm’ of LEAs and the measures that seek to cope with the legal uncertainty and fragmentation that emerged with the informal public-private relationships around the acquisition of e-evidence. The article suggests that the initiatives on different levels might result in even more conflicts of laws than is currently the case, if lacking a coordinated and coherent approach in Europe and internationally. Moreover, the article discusses the impact of the abovementioned developments with regard to EU data protection standards. The compliance of the new rules on access to e-evidence with the EU data protection acquis, namely the GDPR and Directive (EU)2016/680, will be one of the relevant matters covered in this article. [less ▲]

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See detailTaxation of the Sharing Economy in the EU
Pantazatou, Aikaterini UL

in Infranca, John; Davidson, Nestor; Finck, Michele (Eds.) The Cambridge Handbook of the Law of the Sharing Economy (2018)

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See detailAdvancing the Security of Trustworthy Self-IoT (Position Paper)
Msadek, Mohamed Nizar UL; Soua, Ridha UL; Ladid, Latif UL et al

in International Conference on Smart Applications, Communications and Networking (SmartNets) (2018, November)

The Internet of Things (IoT) encompasses many aspects of our daily life, from connected homes and cities through connected vehicles and roads to devices that collaborate independently to achieve a ... [more ▼]

The Internet of Things (IoT) encompasses many aspects of our daily life, from connected homes and cities through connected vehicles and roads to devices that collaborate independently to achieve a specific purpose. Being an example of a largescale self-organizing systems, the IoT should present imperative properties such as autonomy and trustworthiness. However, compared to classical self-organizing systems, IoT has intrinsic characteristics (wide deployment, resource constraints, uncertain environment, etc.) that open up several security challenges. These challenges cannot be solved by existing Autonomic and Organic Computing techniques and therefore new techniques adapted to self-organizing IoT, (that we call Self-IoT) peculiarities are needed. To this end, this paper studies related work in the area of self-organizing IoT, identifies and describes the key research challenges for trustworthy secure Self-IoT and proposes new and tailored existing solutions. [less ▲]

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