References of "Poster"      in Complete repository Arts & humanities   Archaeology   Art & art history   Classical & oriental studies   History   Languages & linguistics   Literature   Performing arts   Philosophy & ethics   Religion & theology   Multidisciplinary, general & others Business & economic sciences   Accounting & auditing   Production, distribution & supply chain management   Finance   General management & organizational theory   Human resources management   Management information systems   Marketing   Strategy & innovation   Quantitative methods in economics & management   General economics & history of economic thought   International economics   Macroeconomics & monetary economics   Microeconomics   Economic systems & public economics   Social economics   Special economic topics (health, labor, transportation…)   Multidisciplinary, general & others Engineering, computing & technology   Aerospace & aeronautics engineering   Architecture   Chemical engineering   Civil engineering   Computer science   Electrical & electronics engineering   Energy   Geological, petroleum & mining engineering   Materials science & engineering   Mechanical engineering   Multidisciplinary, general & others Human health sciences   Alternative medicine   Anesthesia & intensive care   Cardiovascular & respiratory systems   Dentistry & oral medicine   Dermatology   Endocrinology, metabolism & nutrition   Forensic medicine   Gastroenterology & hepatology   General & internal medicine   Geriatrics   Hematology   Immunology & infectious disease   Laboratory medicine & medical technology   Neurology   Oncology   Ophthalmology   Orthopedics, rehabilitation & sports medicine   Otolaryngology   Pediatrics   Pharmacy, pharmacology & toxicology   Psychiatry   Public health, health care sciences & services   Radiology, nuclear medicine & imaging   Reproductive medicine (gynecology, andrology, obstetrics)   Rheumatology   Surgery   Urology & nephrology   Multidisciplinary, general & others Law, criminology & political science   Civil law   Criminal law & procedure   Criminology   Economic & commercial law   European & international law   Judicial law   Metalaw, Roman law, history of law & comparative law   Political science, public administration & international relations   Public law   Social law   Tax law   Multidisciplinary, general & others Life sciences   Agriculture & agronomy   Anatomy (cytology, histology, embryology...) & physiology   Animal production & animal husbandry   Aquatic sciences & oceanology   Biochemistry, biophysics & molecular biology   Biotechnology   Entomology & pest control   Environmental sciences & ecology   Food science   Genetics & genetic processes   Microbiology   Phytobiology (plant sciences, forestry, mycology...)   Veterinary medicine & animal health   Zoology   Multidisciplinary, general & others Physical, chemical, mathematical & earth Sciences   Chemistry   Earth sciences & physical geography   Mathematics   Physics   Space science, astronomy & astrophysics   Multidisciplinary, general & others Social & behavioral sciences, psychology   Animal psychology, ethology & psychobiology   Anthropology   Communication & mass media   Education & instruction   Human geography & demography   Library & information sciences   Neurosciences & behavior   Regional & inter-regional studies   Social work & social policy   Sociology & social sciences   Social, industrial & organizational psychology   Theoretical & cognitive psychology   Treatment & clinical psychology   Multidisciplinary, general & others     Showing results 1 to 100 of 699 1 2 3 4 5 6     Facial perception and implicit prejudice: An eye-tracking studyStogianni, Maria ; Murdock, Elke Poster (2019, July 09)Racial bias can affect the way of processing visual stimuli that are targets of prejudice. Different levels of prejudice and the type of prejudice (implicit vs. explicit) were related to automatic and ... [more ▼]Racial bias can affect the way of processing visual stimuli that are targets of prejudice. Different levels of prejudice and the type of prejudice (implicit vs. explicit) were related to automatic and controlled processes of visual exploration (Hansen Rakhshan, Ho, & Pannasch, 2015). The proposed study aims to extend these findings by including pictures of individuals that belong to different racial and ethnic groups (White, Asian, Black, Latino) and vary in prototypical characteristics. Images of the Chicago Face Database will be presented in an online study. Eye movements will be recorded during the presentation of visual stimuli. We will examine differences in exploratory looking behavior among natives in a western European country and individuals with migratory background. [less ▲]Detailed reference viewed: 32 (5 UL) The use of value-added models for the identification of schools that perform “against the odds”Levy, Jessica ; Brunner, Martin; Keller, Ulrich et alPoster (2019, July)Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high ... [more ▼]Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high-stakes decisions. To date, there seems to be no consensus concerning the calculation of VA models. Our study aims to systematically analyze and compare different school VA models by using longitudinal large-scale data emerging from the Luxembourg School Monitoring Programme. Regarding the model covariates, first findings indicate the importance of language (i.e., language(s) spoken at home and prior language achievement) in VA models with either language or math achievement as a dependent variable, with the highest amount of explained variance in VA models for language. Concerning the congruence of different VA approaches, we found high correlations between school VA scores from the different models, but also high ranges between VA scores for single schools. We conclude that VA models should be used with caution and with awareness of the differences that may arise from methodological choices. Finally, we discuss the idea that VA models could be used for the identification of schools that perform “against the odds”, especially for those schools that have positive VA scores over several years. [less ▲]Detailed reference viewed: 45 (2 UL) Magnetic Guinier LawMalyeyev, Artem ; Michels, Andreas Poster (2019, June)We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of ... [more ▼]We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of this novel approach is discussed and the quantities derived are analyzed in the framework of the existing research literature. [less ▲]Detailed reference viewed: 57 (12 UL) Subjective Reasons for Using versus not Using Assistive Technologies in Aging Population: A Meta-Synthesis of Qualitative StudiesAbrilahij, Afsaneh ; Boll, Thomas Poster (2019, May 24)The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such ... [more ▼]The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such limitations is to promote the use of assistive technologies (ATs) in the aging population. Despite evident benefits of ATs in this context, the use rate is still low. To find out why this is the case, we performed systematic literature searches in PsycINFO, MEDLINE, and Google Scholar databases about subjective reasons of older people for use and non-use of these devices. We then performed a meta-synthesis of the relevant studies in order to arrive at a comprehensive view of older people’s reasons for the use or non-use of ATs. Beliefs about ease to use and reliability of AT use as well as perceived suggestion by significant others to use ATs were important reasons for using them. Beliefs about insecurity, uselessness and other attributes of ATs as well as desires to avoid burden for others were major reasons for not using of ATs. We systematized the identified subjective reasons for using versus not using as referring to (1) situation of need and demand for an AT, (2) suggestion by significant others, (3) act of using, and (4) consequences of AT use. Most of the reasons were reasons for non-use such as beliefs about negative attributes of ATs, and the consequences of their use. In contrast, desires were only rarely mentioned as reasons for use or non-use of ATs. Comparing subjective reasons of our meta-synthesis with predictors in ATs use models, we found that only 5 out of 25 identified subjective reasons have already been considered in these models. Thus, these models appear not yet to be sufficiently comprehensive. We suggest integrating the identified subjective reasons from our meta-synthesis as additional predictors in a comprehensive AT use model with an improved predictive power. [less ▲]Detailed reference viewed: 57 (7 UL) Mint Centrality: A Centrality Measure for the Bitcoin Transaction GraphFiz Pontiveros, Beltran ; Steichen, Mathis ; State, Radu Poster (2019, May 17)In this work, we consider the graph of confirmed transactions in Bitcoin. Understanding this graph is essential to discern the different economic activities conducted by the pseudonymous actors. In ... [more ▼]In this work, we consider the graph of confirmed transactions in Bitcoin. Understanding this graph is essential to discern the different economic activities conducted by the pseudonymous actors. In addition to traditional graph analysis methods, new metrics need to be engineered specifically for the bitcoin transaction graph. Hence, we propose a new centrality measure named mint centrality. The measure uses the inherent tree structure of transactions in bitcoin and their relation to the corresponding set of coinbase transactions, and can be evaluated with linear complexity. We evaluate the mint centrality on the first 200,000 blocks of the public bitcoin blockchain. [less ▲]Detailed reference viewed: 29 (0 UL) Size-dependent spatial magnetization profile of Manganese – Zinc ferrite nanoparticlesBersweiler, Mathias Poster (2019, May 15)Detailed reference viewed: 24 (3 UL) Are dates processed like words rather than like numbers? A study of transposition priming effectsLochy, Aliette ; Golinvaux, Fanny; Schiltz, Christine Poster (2019, May)Neuropsychological case-studies suggested that dates and encyclopedic numbers may be processed differently than unknown numbers. However, this issue was not yet investigated in reading in healthy ... [more ▼]Neuropsychological case-studies suggested that dates and encyclopedic numbers may be processed differently than unknown numbers. However, this issue was not yet investigated in reading in healthy participants, so that it is unclear if dates are read like words and processed as lexical items, or like numbers where each position strictly defines the digit value in a base-10 system. Here, we compared processing of known dates to unknown numbers in a group of 26 experts (students and teachers in History). Participants performed an explicit recognition task on dates (e.g., 1789, 1945, …) and on acronyms (e.g., FNRS, HDMI, …), half known and half unknown. They were preceded by an identical prime (e.g., 1945-1945), a transposed-character prime (e.g., 1495-1945) or a substituted-character prime (e.g., 1635-1945). Results show that for dates, there is a significant transposition gain (-57ms), while for unknown numbers as well as for acronyms (known and unknown), the transposed-character prime induced a cost (from +17 to +257ms) rather than a gain. The facilitation due to transposed characters found here on dates is similar to what is observed in studies of lexical decision on words. Therefore, it suggests that dates may be processed with similar types of orthographical mechanisms than words. [less ▲]Detailed reference viewed: 21 (3 UL) Improved Monitoringand Tracking Hurricanes using GPS Atmospheric WaterVapourEjigu, Yohannes Getachew; Teferle, Felix Norman ; klose, Anna et alPoster (2019, April 09)Detailed reference viewed: 56 (3 UL) Longitudinal Approaches to Study Changes In Mood States And Subjective Well-Being: Multilevel Modeling Vs. Latent Growth Curve AnalysisStogianni, Maria ; Murdock, Elke Poster (2019, April 09)Detailed reference viewed: 44 (9 UL) Integration of high-resolution space-borne and terrestrial topographic data sets - Case study Tristan da CunhaBackes, Dietmar ; Teferle, Felix Norman Poster (2019, April 09)Detailed reference viewed: 58 (9 UL) The role of executive functions in task-related analgesiaRischer, Katharina Miriam ; Gigl, Sandra; Dierolf, Angelika et alPoster (2019, March)Introduction: Recent research suggests that weaker executive functions may be linked to a higher risk of pain chronicity. However, little is known about how executive functions affect the modulation of ... [more ▼]Introduction: Recent research suggests that weaker executive functions may be linked to a higher risk of pain chronicity. However, little is known about how executive functions affect the modulation of acute pain. The present study aimed to investigate the impact of inhibitory control on the success of cognitive distraction from pain. Methods: Participants completed a battery of cognitive tasks (Go/NoGo, Color Stroop, Eriksen Flanker), assessing their cognitive inhibition and selective attention abilities. Additionally, self-report measures of pain catastrophizing and fear of pain were administered. In a pain distraction paradigm, participants completed either a cognitively demanding working memory task (2-back task) or a visually matched easy control task (target response task) while receiving warm or painful thermal stimuli to their left forearm. Nociceptive stimulus intensity was individually calibrated for each participant. Moreover, to maintain a similar level of task difficulty across participants, task speed was continuously adapted based on the participant's performance in the previous trials. Following each trial, participants rated the perceived intensity and unpleasantness of the thermal stimuli on visual analogue scales. Results: As expected, preliminary results indicate that the 2-back task, but not the target response task, successfully distracted participants from thermal pain, manifesting in significantly lower intensity and unpleasantness ratings. Importantly, the magnitude of the distraction effect was negatively associated with the Flanker effect. Discussion: In line with previous research, engaging in a cognitively demanding task led to significantly lower pain intensity and unpleasantness ratings when compared to an easy control task. Moreover, results indicate that better interference control abilities may predict greater task-related analgesia. Taken together, the results of the present study suggest that it is crucial to assess executive functions to develop a better understanding of the mechanisms behind cognitive distraction from pain. [less ▲]Detailed reference viewed: 16 (3 UL) Lateralization for faces in prereaders depends on the perceptual processing level: An EEG Fast Periodic Visual Stimulation studyLochy, Aliette ; Schiltz, Christine ; Rossion, BrunoPoster (2019, January)The developmental origin of human adults’ right hemispheric lateralization to face stimuli is unclear, in particular because young infants’ right hemispheric advantage in face perception is no longer ... [more ▼]The developmental origin of human adults’ right hemispheric lateralization to face stimuli is unclear, in particular because young infants’ right hemispheric advantage in face perception is no longer present in preschool children, before written language acquisition. Here we used fast periodic visual stimulation (FPVS) with scalp electrophysiology to test 52 preschool children (5 years old) at two levels of face processing (i.e., faces vs. objects, or discrimination between individual faces). While the contrast between faces and nonface objects elicits strictly bilateral occipital responses in children, discrimination of faces on the basis of identity in the same children is associated with a strong right hemispheric lateralization over the occipito-temporal cortex. Inversion of the face stimuli does not modulate right lateralization but significantly decreases the discrimination response. Furthermore, there is no relationship between right hemispheric lateralization in individual face discrimination and preschool levels of letter recognition. These observations suggest that right lateralization for face perception is essentially driven by the necessity to process faces at the level of identity. Overall, they also challenge the view that the adult right hemispheric lateralization for face perception emerges late and slowly during childhood due to increased competition with left lateralized posterior network for reading. [less ▲]Detailed reference viewed: 47 (3 UL) Optimisation de la prise en charge médicale des patients sortant de prison au LuxembourgBattista, Jorge; Stein, Romain; Baumann, Michèle Poster (2019)Le passage en prison peut être un gain de chance pour la santé de la population carcérale qui a généralement un faible accès au système de soins. L’élargissement de prison peut devenir une période de ... [more ▼]Le passage en prison peut être un gain de chance pour la santé de la population carcérale qui a généralement un faible accès au système de soins. L’élargissement de prison peut devenir une période de vulnérabilité où ce gain potentiellement acquis s’annule si la transition vers la société civile n’est pas anticipée. L’objectif principal était l’identification et l’analyse des facteurs qui favorisent et s’opposent à une pratique de soins primaires chez les patients sortant du milieu carcéral au Luxembourg. L’objectif secondaire était l’élaboration de recommandations à l’égard des principaux résultats en s’appuyant sur une revue de la littérature. Méthodes : Une enquête qualitative à l’aide d’entretiens semi-dirigés a été menée auprès de médecins généralistes et de patients-détenus. Les questions des deux guides d’entretien étaient semblables afin que l’analyse permette une mise en miroir des résultats. Un recueil des caractéristiques sociodémographiques a également été effectué. A l’aide de la transcription des entretiens, une analyse de contenu thématique catégorielle de ces derniers a été réalisée au regard des objectifs. Sur base des verbatim, des items ont été formulés et regroupés en dimensions puis en thèmes. Résultats : Notre analyse a mis en lumière le manque de relais entre la prison et l’extérieur à chaque étape de la prise en charge médico-psycho-sociale du point de vue des soins et des aides proposées en prison jusqu’à l’élargissement. Des recommandations concernant des améliorations possibles ont pu être proposées, comme la création d’un réseau de médecins généralistes prenant le relais ainsi qu’une véritable coopération avec des organisations prenant en charge des toxicomanes. Conclusion : Des reformes concernant les soins en prison devraient être envisagées entre le système de l’élargissement, la création de relais socio-médicaux et des alternatives à l’incarcération, en analogie aux transitions clinics retrouvés aux États-Unis. [less ▲]Detailed reference viewed: 84 (2 UL) Suicide Prevention in Luxembourg: Using the HBSC Symptom Checklist as an Alternative Tool for ScreeningCatunda, Carolina ; van Duin, Claire ; Heinz, Andreas et alPoster (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: 72 (10 UL) Schulische Kompetenzen von Erstklässlern und ihre Entwicklung nach zwei Jahren.Hoffmann, Danielle ; Hornung, Caroline; Gamo, Sylvie et alPoster (2018, November 08)Jedes Jahr werden in den luxemburgischen Schulen die ÉpStan (Épreuves Standardisées) durchgeführt. Hierbei handelt es sich um nationale Schulleistungstests, welche Kompetenzen im Bereich der Mathematik ... [more ▼]Jedes Jahr werden in den luxemburgischen Schulen die ÉpStan (Épreuves Standardisées) durchgeführt. Hierbei handelt es sich um nationale Schulleistungstests, welche Kompetenzen im Bereich der Mathematik und den Schulsprachen (Luxemburgisch, Deutsch und Französisch) auf standardisierte Art messen. Der vorliegende Beitrag ist sowohl eine Bestandsaufnahme der Schülerschaft zu Beginn des formalen Bildungswegs als auch ein Bericht ihrer Evolution über zwei Jahre im luxemburgischen Schulsystem. Hierzu haben wir die Daten aus drei Erhebungen (2014, 2015, 2016) der ÉpStan analysiert. Zum einen zeigen wir, anhand von Daten aus drei verschiedenen Kohorten, welche schulischen Kompetenzen Erstklässler (Zyklus 2.1) am Anfang ihrer Schullaufbahn aufweisen. Zudem hatten wir die Möglichkeit die Schüler und Schülerinnen der ersten Erhebung (2014) zwei Jahre später im Zyklus 3.1 nochmals zu testen und somit ihren Entwicklungsverlauf über zwei Jahre im luxemburgischen Bildungssystem zu dokumentieren. Diese ersten längsschnittlichen Daten zeigen, dass die Mehrheit der Schülerinnen und Schüler zu Beginn des Zyklus 2.1 das Niveau Avancé in den drei überprüften Kernkompetenzen („Luxemburgisch-Hörverstehen“, „Vorläuferfertigkeiten der Schriftsprache“ und „Mathematik“) erreicht. Somit stellen wir fest, dass die für den ersten Lernzyklus festgehaltenen Bildungsstandards erfüllt sind. Zwei Jahre später fällt die Verteilung der Schülerinnen und Schüler auf die verschiedenen Kompetenzränge negativer aus als im Zyklus 2.1. Im Zyklus 3.1 haben vergleichsweise mehr Kinder das Niveau Socle in allen drei Kernkompetenzen („Deutsch-Hörverstehen“, „Deutsch-Leseverstehen“ und „Mathematik“) noch nicht erreicht. Unsere Befunde zeigen außerdem, dass verschiedene außerschulische Faktoren (wie z. B. sozioökonomische Situation, Sprachhintergrund) bereits sehr früh im Verlauf der Schullaufbahn einen äußerst starken Einfluss auf die Testergebnisse haben und sich dieser Einfluss über die Jahre hinweg verstärkt. Abschließend präsentieren und diskutieren wir verschiedene Erklärungsansätze für diesen beobachteten Schereneffekt. [less ▲]Detailed reference viewed: 43 (4 UL) Cognitive Potential and Academic Success in Luxembourg: Use case of the "Test of Cognitive Potential"Muller, Claire ; Reichel, Yanica ; Wollschläger, Rachel et alPoster (2018, November 08)The “Test of Cognitive Ability” (“TCP”) is a language-free test of reasoning ability that was created at the heart of the Luxembourg Centre for Educational Testing (LUCET). The TCP was initially developed ... [more ▼]The “Test of Cognitive Ability” (“TCP”) is a language-free test of reasoning ability that was created at the heart of the Luxembourg Centre for Educational Testing (LUCET). The TCP was initially developed for children at the age of 10 and can be applied in a group context. Since no advanced language-skills are required in order to take this test, it is perfectly suited not only to serve as a cognitive ability screener in a multi-lingual context, but also to study the relationship of cognitive ability and academic success within a demanding school-system that deals with a very complex mixture of student backgrounds (spoken languages, socioeconomic status, culture, etc.). Using traditional intelligence tests with language-based tasks and instructions could, in this context, result in biased data since maximum performance relies on a good understanding of task requirements. Being language-free, the TCP can help in gaining a more precise understanding of academic performance under different circumstances and prevent wrong conclusions as to the fairness of curricular requirements for different student populations. The present contribution will present the Test of Cognitive Potential and give an overview of how the relationship of cognitive ability and academic success varied within different subpopulations of a Luxembourgish sample of 303 4th graders. [less ▲]Detailed reference viewed: 45 (11 UL) School ShootingsBöhmer, Matthias ; Hale, Miriam-Linnea Poster (2018, November)Detailed reference viewed: 26 (4 UL) LE MOYEN ÂGE ENTRE FASCINATION ET EMANCIPATION. ÉTAT DES LIEUX ET NOUVELLES PERSPECTIVES AU LUXEMBURGVomacka, Eloïse Poster (2018, November)Detailed reference viewed: 40 (2 UL) Les Luxembourg : projet dynastique et construction de la domination entre perspectives globales et localesVomacka, Eloïse Poster (2018, November)Detailed reference viewed: 38 (2 UL) Critical transitions in microbial communities: mobile genetic elements as drivers of the microbial community dynamics within activated sludge of wastewater treatmentMartinez Arbas, Susana ; Narayanasamy, Shaman; Herold, Malte et alPoster (2018, October 19)Detailed reference viewed: 44 (4 UL) DEMO: An Effective Android Code Coverage ToolPilgun, Aleksandr ; Gadyatskaya, Olga ; Dashevskyi, Stanislav et alPoster (2018, October 15)The deluge of Android apps from third-party developers calls for sophisticated security testing and analysis techniques to inspect suspicious apps without accessing their source code. Code coverage is an ... [more ▼]The deluge of Android apps from third-party developers calls for sophisticated security testing and analysis techniques to inspect suspicious apps without accessing their source code. Code coverage is an important metric used in these techniques to evaluate their effectiveness, and even as a fitness function to help achieving better results in evolutionary and fuzzy approaches. Yet, so far there are no reliable tools for measuring fine-grained bytecode coverage of Android apps. In this work we present ACVTool that instruments Android apps and measures the smali code coverage at the level of classes, methods, and instructions. Tool repository: https://github.com/pilgun/acvtool [less ▲]Detailed reference viewed: 51 (11 UL) Combining PET imaging and blood metabolomics data to improve machine learning models for Parkinson’s disease diagnosisGlaab, Enrico ; Trezzi, Jean-Pierre ; Greuel et alPoster (2018, October 08)Objective: To investigate whether the integration of PET imaging and metabolomics data can provide improved machine learning models for PD diagnosis. Background: The reliable diagnosis of PD can remain ... [more ▼]Objective: To investigate whether the integration of PET imaging and metabolomics data can provide improved machine learning models for PD diagnosis. Background: The reliable diagnosis of PD can remain challenging, even at the motor stage. PET imaging can be used to confirm the clinical diagnosis. However, limitations in the robustness of predictive features extracted from the data and the costs associated with PET imaging restrict its application. Using blood metabolomics data as an additional information source may provide improved combined diagnostic models and/or an initial filter to decide on whether to apply PET imaging. Methods: Metabolomics profiling of blood plasma samples using gas chromatography coupled to mass spectrometry (GC­MS) was conducted in 60 IPD patients and 15 healthy controls. After pre-processing, these data were compared to neuroimaging data for subsets of the same individuals using FDOPA PET (44 patients and 14 controls) and FDG PET (51 patients and 15 controls). Machine learning models using linear support vector machines were trained on 50% of the data and evaluated on a 50% hold­out test set using Receiver Operating Characteristic (ROC) curves. Next, standardized FDOPA and FDG PET intensity measurements were combined with those from the metabolomics data to build and evaluate sample classification models in the same manner as for the individual datasets. Results: Both for the FDOPA and FDG PET data, the predictive performance given by the area under the ROC curve (AUC) was highest when combining imaging features with those from the metabolomics data (AUC for FDOPA + metabolomics: 0.98; AUC for FDG + metabolomics: 0.91). The performance was generally lower when using only the respective PET attributes (FDOPA: 0.94, FDG: 0.8) or only the metabolomics data (AUC: 0.66). [less ▲]Detailed reference viewed: 94 (16 UL) oral history and technology - integrating digital tools in the scholarly workflowScagliola, Stefania ; Corti, louise; Calamai, silvia et alPoster (2018, October 08)This poster is the outcome of the multidisciplinary workshop held in Munchen in september 2018, in which a multidisciplinary group of scholars experimented with automatic transcription tools, text ... [more ▼]This poster is the outcome of the multidisciplinary workshop held in Munchen in september 2018, in which a multidisciplinary group of scholars experimented with automatic transcription tools, text analysis, annotation and emotion recognition tools, applied to interview data [less ▲]Detailed reference viewed: 17 (4 UL) The Influence of Code Coverage Metrics on Automated Testing Efficiency in AndroidDashevskyi, Stanislav ; Gadyatskaya, Olga ; Pilgun, Aleksandr et alPoster (2018, October)Code coverage is an important metric that is used by automated Android testing and security analysis tools to guide the exploration of applications and to assess efficacy. Yet, there are many different ... [more ▼]Code coverage is an important metric that is used by automated Android testing and security analysis tools to guide the exploration of applications and to assess efficacy. Yet, there are many different variants of this metric and there is no agreement within the Android community on which are the best to work with. In this paper, we report on our preliminary study using the state-of-the-art automated test design tool Sapienz. Our results suggest a viable hypothesis that combining different granularities of code coverage metrics can be beneficial for achieving better results in automated testing of Android applications. [less ▲]Detailed reference viewed: 84 (19 UL) Das PALUX-Projekt in Luxemburg: Forschungsdesign und erste Ergebnisse einer PilotstudieEckelt, Melanie ; Hutmacher, Djenna ; Steffgen, Georges et alPoster (2018, October)Detailed reference viewed: 27 (9 UL) Microbiome-derived Multi-omicBiomarkers for Early-stage Detection and Stratification of Parkinson's DiseaseTrezzi, Jean-Pierre ; Ramiro Garcia, Javier ; Laczny, Cedric Christian et alPoster (2018, October)Detailed reference viewed: 39 (10 UL) Facilitating Privacy-preserving Recommendation-as-a-Service with Machine LearningWang, Jun ; Arriaga, Afonso; Tang, Qiang et alPoster (2018, October)Machine-Learning-as-a-Service has become increasingly popular, with Recommendation-as-a-Service as one of the representative examples. In such services, providing privacy protection for users is an ... [more ▼]Machine-Learning-as-a-Service has become increasingly popular, with Recommendation-as-a-Service as one of the representative examples. In such services, providing privacy protection for users is an important topic. Reviewing privacy-preserving solutions which were proposed in the past decade, privacy and machine learning are often seen as two competing goals at stake. Though improving cryptographic primitives (e.g., secure multi-party computation (SMC) or homomorphic encryption (HE)) or devising sophisticated secure protocols has made a remarkable achievement, but in conjunction with state-of-the-art recommender systems often yields far-from-practical solutions. We tackle this problem from the direction of machine learning. We aim to design crypto-friendly recommendation algorithms, thus to obtain efficient solutions by directly using existing cryptographic tools. In particular, we propose an HE-friendly recommender system, refer to as CryptoRec, which (1) decouples user features from latent feature space, avoiding training the recommendation model on encrypted data; (2) only relies on addition and multiplication operations, making the model straightforwardly compatible with HE schemes. The properties turn recommendation-computations into a simple matrix-multiplication operation. To further improve efficiency, we introduce a sparse-quantization-reuse method which reduces the recommendation-computation time by $9\times$ (compared to using CryptoRec directly), without compromising the accuracy. We demonstrate the efficiency and accuracy of CryptoRec on three real-world datasets. CryptoRec allows a server to estimate a user's preferences on thousands of items within a few seconds on a single PC, with the user's data homomorphically encrypted, while its prediction accuracy is still competitive with state-of-the-art recommender systems computing over clear data. Our solution enables Recommendation-as-a-Service on large datasets in a nearly real-time (seconds) level. [less ▲]Detailed reference viewed: 81 (4 UL) A Statistically Efficient Estimator for Co-array Based DoA EstimationSedighi, Saeid ; Shankar, Bhavani ; Ottersten, Björn Poster (2018, October)Co-array-based Direction of Arrival (DoA) estimation using Sparse linear arrays (SLAs) has recently gained considerable interest in array processing due to the attractive capability of providing enhanced ... [more ▼]Co-array-based Direction of Arrival (DoA) estimation using Sparse linear arrays (SLAs) has recently gained considerable interest in array processing due to the attractive capability of providing enhanced degrees of freedom. Although a variety of estimators have been suggested in the literature for co-array-based DoA estimation, none of them are statistically efficient. This work introduces a novel Weighted Least Squares (WLS) estimator for the co-array-based DoA estimation employing the covariance fitting method. Then, an optimal weighting is given so that the asymptotic performance of the proposed WLS estimator coincides with the Cram\'{e}r-Rao Bound (CRB), thereby ensuring statistical efficiency of resulting WLS estimator. This implies that the proposed WLS estimator has significantly better performance compared to existing methods in the literature. Numerical simulations are provided to corroborate the asymptotic statistical efficiency and the improved performance of the proposed estimator. [less ▲]Detailed reference viewed: 86 (21 UL) The Price of Privacy in Collaborative LearningPejo, Balazs ; Tang, Qiang ; Gergely, BiczokPoster (2018, October)Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training ... [more ▼]Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training dataset; in reality a small or medium sized organization often does not have enough data to train a reasonably accurate model. For such organizations, a realistic solution is to train machine learning models based on a joint dataset (which is a union of the individual ones). Unfortunately, privacy concerns prevent them from straightforwardly doing so. While a number of privacy-preserving solutions exist for collaborating organizations to securely aggregate the parameters in the process of training the models, we are not aware of any work that provides a rational framework for the participants to precisely balance the privacy loss and accuracy gain in their collaboration. In this paper, we model the collaborative training process as a two-player game where each player aims to achieve higher accuracy while preserving the privacy of its own dataset. We introduce the notion of Price of Privacy, a novel approach for measuring the impact of privacy protection on the accuracy in the proposed framework. Furthermore, we develop a game-theoretical model for different player types, and then either find or prove the existence of a Nash Equilibrium with regard to the strength of privacy protection for each player. [less ▲]Detailed reference viewed: 94 (5 UL) Why engage with Digital Source Criticism?Garcia Martin, Cristina; Scagliola, Stefania Poster (2018, September 26)This poster illustrates the concept of the teaching platform Ranke.2 with lessons on Digital Source CriticismDetailed reference viewed: 31 (7 UL) Verlet buffer for broad phase interaction detection in Discrete Element MethodMainassara Chekaraou, Abdoul Wahid ; Rousset, Alban ; Besseron, Xavier et alPoster (2018, September 24)The Extended Discrete Element Method (XDEM) is a novel and innovative numerical simulation technique that extends the dynamics of granular materials or particles as described through the classical ... [more ▼]The Extended Discrete Element Method (XDEM) is a novel and innovative numerical simulation technique that extends the dynamics of granular materials or particles as described through the classical discrete element method (DEM) by additional properties such as the thermodynamic state, stress/strain for each particle. Such DEM simulations used by industries to set up their experimental processes are complexes and heavy in computation time. Therefore, simulations have to be precise, efficient and fast in order to be able to process hundreds of millions of particles. To tackle this issue, such DEM simulations are usually parallelized with MPI. One of the most expensive computation parts of a DEM simulation is the collision detection of particles. It is classically divided into two steps: the broad phase and the narrow phase. The broad phase uses simplified bounding volumes to perform an approximated but fast collision detection. It returns a list of particle pairs that could interact. The narrow phase is applied to the result of the broad phase and returns the exact list of colliding particles. The goal of this research is to apply a Verlet buffer method to (X)DEM simulations regardless of which broad phase algorithm is used. We rely on the fact that such DEM simulations are temporal coherent: the neighborhood only changes slightly from the last time-step to the current time-step. We use the Verlet buffer method to extend the list of pairs returned by the broad phase by stretching the particles bounding volume with an extension range. This allows re-using the result of the broad phase for several time-steps before an update is required once again and thereby its reduce the number of times the broad phase is executed. We have implemented a condition based on particles displacements to ensure the validity of the broad phase: a new one is executed to update the list of colliding particles only when necessary. This guarantees identical results because approximations introduced in the broad phase by our approach are corrected in the narrow phase which is executed at every time-steps anyway. We perform an extensive study to evaluate the influence of the Verlet extension range on the performance of the execution in terms of computation time and memory consumption. We consider different test-cases, partitioners (ORB, Zoltan, METIS, SCOTCH, ...), broad phase algorithms (Link cell, Sweep and prune, ...) and grid configurations (fine, coarse), sequential and parallel (up to 280 cores). While a larger Verlet buffer increases the cost of the broad phase and narrow phase, it also allows skipping a significant number of broad phase execution (> 99 \%). As a consequence, our first results show that this approach can speeds up the total .execution time up to a factor of 5 for sequential executions, and up to a factor of 3 parallel executions on 280 cores while maintaining a reasonable memory consumption. [less ▲]Detailed reference viewed: 53 (13 UL) Autogenous Laser welding of copper to aluminiumMathivanan, Karthik ; Plapper, Peter Poster (2018, September 13)This work investigates laser joining of copper sheets to aluminium in overlap configuration. Dissimilar Cu-Al connections are widely used in the electrical and electronics applications e.g. battery and ... [more ▼]This work investigates laser joining of copper sheets to aluminium in overlap configuration. Dissimilar Cu-Al connections are widely used in the electrical and electronics applications e.g. battery and solar panels.Joining these materials is a very critical assembly process. The laser welding from the aluminium surface to copper (Al-Cu) is well described in the literature .But there is no data concerning the laser seam welding from the copper side to join with aluminium i.e Cu-Al.The selection of aluminium surface to irradiate is mainly because of poor absorption of copper to laser in IR region.But high intensities of about 100 MW/cm2 allow for initial vaporization of copper surface.Once the keyhole is generated, absorption of laser light is improved.Thereby high power lasers allow for successful penetration of copper surface to produce a joint with aluminium. The main objective is to investigate the approach of dissimilar laser welding starting from the copper surface to aluminium.The effect of process parameters on the shear force, microstructure and weld pool dimensions are studied.An experimental design is realized to see the effect of laser irradiation of copper surface (Cu-Al) in contrast to aluminium surface(Al-Cu). The selection of aluminium or copper surface is mainly dependent on the laser power.With the high power disk laser the possibility of joining from the copper side was evident and results of joining copper to aluminium and aluminium to copper are comparable.Therefore welding from a highly reflective surface to achive a comparable shear strength is demonstrated. [less ▲]Detailed reference viewed: 73 (17 UL) A multi-omic view of invasive genetic elements and their linked prokaryotic population dynamics within a mixed microbial communityMartinez Arbas, Susana ; Narayanasamy, Shaman; Herold, Malte et alPoster (2018, September 11)Detailed reference viewed: 27 (3 UL) Laser micro-welding of wire to flat geometry for dissimilar materials in an electromechanical applicationAmne Elahi, Mahdi ; Plapper, Peter Poster (2018, September 11)In the presented study, the laser welding of wire to flat geometry for miniature electromechanical hybrid components has been investigated. Laser welding offers variety of advantages compared to the ... [more ▼]In the presented study, the laser welding of wire to flat geometry for miniature electromechanical hybrid components has been investigated. Laser welding offers variety of advantages compared to the current joining processes for this application however, considering the geometry of parts to be welded also mechanical properties requirement, an accurate spatial modulation of laser beam should be implemented to achieve a sound joint. Tensile shear test and optical microscopy were employed to represent the mechanical properties and melt pool geometry of the joint. All welds were done by power modulation of the laser beam to better control the energy input at several feed rates and three different beam trajectories. Results show that the shear load of the joint can be controlled by feed rate and the trajectory of the laser beam. The material combination of the study (Nickel and CuSn6), represents solubility in solid state therefore, by defining a proper spatial modulation of the laser beam a joint stronger than base wire metal is achievable. Figure 1 represents schematics of weld components. [less ▲]Detailed reference viewed: 42 (8 UL) Differential association of symbolic and non-symbolic numerical abilities in children with and without MLD – Evidence from large scale assessment dataBraeuning, David; Hornung, Caroline ; Hoffmann, Danielle et alPoster (2018, September)Detailed reference viewed: 51 (6 UL) The relation between visuospatial abilities and verbal number skills in preschool: Adding spatial language to the equationGeorges, Carrie ; Cornu, Véronique; Schiltz, Christine Poster (2018, September)Detailed reference viewed: 26 (4 UL) Achievement and Language Choice on a Bilingual Math Test in German-French biliterate ninth-gradersMartini, Sophie Frédérique ; Ugen, Sonja Poster (2018, September)Detailed reference viewed: 18 (1 UL) Das Palux-Projekt in Luxemburg: Forschungsdesign und erste Ergebnisse einer PilotstudieEckelt, Melanie ; Hutmacher, Djenna ; Steffgen, Georges et alPoster (2018, September)Detailed reference viewed: 46 (7 UL) Besteuerung und Daten: Ist eine "Destination-Based Corporate Tax" die Lösung für die Ertragsbesteuerung digitaler Geschäftsaktivitäten?Sinnig, Julia Poster (2018, September)Detailed reference viewed: 33 (1 UL) Dynamisches Problemlösen und figurale Matrizenaufgaben. Das MaFIN Item-FormatKunze, Thiemo ; Stadler, Matthias ; Krieger, Florian et alPoster (2018, September)Detailed reference viewed: 60 (4 UL) Knowledge Discovery Approach from Blockchain, Crypto-currencies, and Financial Stock ExchangesLagraa, Sofiane ; Charlier, Jérémy Henri J. ; State, Radu Poster (2018, August 20)Last few years have witnessed a steady growth in interest on crypto-currencies and blockchains. They are receiving considerable interest from industry and the research community, the most popular one ... [more ▼]Last few years have witnessed a steady growth in interest on crypto-currencies and blockchains. They are receiving considerable interest from industry and the research community, the most popular one being Bitcoin. However, these crypto-currencies are so far relatively poorly analyzed and investigated. Recently, many solutions, mostly based on ad-hoc engineered solutions, are being developed to discover relevant analysis from crypto-currencies, but are not sufficient to understand behind crypto-currencies. In this paper, we provide a deep analysis of crypto-currencies by proposing a new knowledge discovery approach for each crypto-currency, across crypto-currencies, blockchains, and financial stocks. The novel approach is based on a conjoint use of data mining algorithms on imbalanced time series. It automatically reports co-variation dependency patterns of the time series. The experiments on the public crypto-currencies and financial stocks markets data also demonstrate the usefulness of the approach by discovering the different relationships across multiple time series sources and insights correlations behind crypto-currencies. [less ▲]Detailed reference viewed: 106 (4 UL) Microbiome-derived Multi-omicBiomarkers for Early-stage Detection and Stratification of Parkinson's DiseaseTrezzi, Jean-Pierre ; Heintz, Anna ; Muller, Emilie et alPoster (2018, August)Detailed reference viewed: 38 (10 UL) Integrated time-resolved multi-omics for understanding microbial niche ecologyHerold, Malte ; Narayanasamy, Shaman ; Martinez Arbas, Susana et alPoster (2018, August)Microbial communities are strongly shaped by the niche breadths of their constituent populations. However, a detailed understanding of microbial niche ecology is typically lacking. Integrated multi-omic ... [more ▼]Microbial communities are strongly shaped by the niche breadths of their constituent populations. However, a detailed understanding of microbial niche ecology is typically lacking. Integrated multi-omic analyses of host- or environment-derived samples offer the prospect of resolving fundamental and realised niches in situ. In turn, this is considered a prerequisite for niche engineering in order to drive an individual population or a community towards a specific phenotype, e.g., improvement of a biotechnological process. Here, we sampled floating islets on the surface of an activated sludge tank in a time-series spanning 51 time-points over 14 months. Multi-omics datasets (metagenomics, metatranscriptomics, metaproteomics, and (meta-)metabolomics) were generated for all time-points. Leveraging nucleotide sequencing data, we analyzed the community structure and reconstructed genomes for specific populations of interest. Moreover, based on their metabolic potential, three major groups emerged, serving as proxies for their respective fundamental niches . Time-resolved linkage of the proteomic and transcriptomic data to the reconstructed genomes revealed a fine-grained picture of niche realization. In particular, environmental factors (temperature, metabolites, oxygen) were significantly associated with gene expression of individual populations. Furthermore, we subjected the community to controlled oxygen conditions (stable or dynamic) in a bioreactor experiment and measured the transcriptomic response. Our results suggest short-term adaptations of populations of interest with respect to lipid metabolism, among other pathways. In conclusion, our work demonstrates how longitudinal multi-omic datasets can be integrated in order to further our understanding of microbial niche ecology within a biotechnological process with potential applications beyond waste water treatment. [less ▲]Detailed reference viewed: 125 (10 UL) Do the relative patterns of green space within cities impact carbon uptake? A European scale analysisBoura, Marlène Delphine Fabienne Poster (2018, August)Detailed reference viewed: 38 (4 UL) Influence of pubic symphysis stiffness on pelvis stress distribution during single leg stanceRicci, Pierre-Louis ; Maas, Stefan ; Gerich, Torsten et alPoster (2018, July 09)Detailed reference viewed: 31 (10 UL) Identity construal processes in a multicultural context: The role of migration status and personality factorsStogianni, Maria ; Murdock, Elke Poster (2018, July 04)Detailed reference viewed: 46 (24 UL) Acculturation as a success story: Theoretical elaborations, lay perceptions and empirical evidence for “successful” migration in the multicultural context of LuxembourgAlbert, Isabelle ; Barros Coimbra, Stephanie Poster (2018, July 04)Acculturation research has for a long time concentrated on problematic issues related to migration, often taking a deficit approach. Only recently have researchers shifted their focus toward factors that ... [more ▼]Acculturation research has for a long time concentrated on problematic issues related to migration, often taking a deficit approach. Only recently have researchers shifted their focus toward factors that might be linked to positive outcomes of migration and integration. The present paper will deal with the question of how individuals from migrant and non-migrant families might profit from multiculturalism and cultural diversity in a resource-oriented perspective. After a theoretical elaboration on how “successful” migration could be defined and by which indicators it could be measured, we will focus on lay perceptions of this concept drawing on qualitative interviews from the FNR-funded IRMA study (“Intergenerational Relations in the light of Migration and Ageing”). More precisely, a number of altogether n = 20 Portuguese immigrant and Luxembourgish dyads of one parent and one adult child each discussed about their experiences and views on migration and the multicultural context of Luxembourg. Finally, we will identify predictors of subjective well-being in a quantitative sample of n = 73 Portuguese immigrant families (mostly one adult child together with both parents), taking into account satisfaction in different life domains as well as social and temporal comparison processes. Analyses show that for first generation immigrants as well as for their children social downward comparisons with Luxembourgish and Portuguese peers living in the host country were beneficial for their subjective well-being, whereas comparisons with Portuguese still living in Portugal and temporal comparisons were less important. The discussion will propose an integrative model for the study of migration taking into account participants’ generation status and their migration history. [less ▲]Detailed reference viewed: 28 (2 UL) CONSISTENT LEAST SQUARES ESTIMATOR FOR CO-ARRAY-BASED DOA ESTIMATIONSedighi, Saeid ; Shankar, Bhavani ; Maleki, Sina et alPoster (2018, July)Sparse linear arrays (SLAs), such as nested and co-prime arrays, have the attractive capability of providing enhanced degrees of freedom by exploiting the co-array model. Accordingly, co-array-based ... [more ▼]Sparse linear arrays (SLAs), such as nested and co-prime arrays, have the attractive capability of providing enhanced degrees of freedom by exploiting the co-array model. Accordingly, co-array-based Direction of Arrivals (DoAs) estimation has recently gained considerable interest in array processing. The literature has suggested applying MUSIC on an augmented sample covariance matrix for co-array-based DoAs estimation. In this paper, we propose a Least Squares (LS) estimator for co-array-based DoAs estimation employing the covariance fitting method as an alternative to MUSIC. We show that the proposed LS estimator provides consistent estimates of DoAs of identifiable sources for SLAs. Additionally, an analytical expression for the large sample performance of the proposed estimator is derived. Numerical results illustrate the finite sample behavior in relation to the derived analytical expression. Moreover, the performance of the proposed LS estimator is compared to the co-array-based MUSIC. [less ▲]Detailed reference viewed: 55 (8 UL) Assessing creativityGubenko, Alla ; Houssemand, Claude Poster (2018, July)Detailed reference viewed: 41 (17 UL) Block Circulant Decomposition of Cross-Correlation Matrix for Transmit MIMO BeamformingHammes, Christian ; Shankar, Bhavani ; Ottersten, Björn Poster (2018, July)This paper deals with the design of transmit probing signal under the trade-off between good target discrimination (low cross-correlation beam pattern) and beam pattern design (desired auto-correlation ... [more ▼]This paper deals with the design of transmit probing signal under the trade-off between good target discrimination (low cross-correlation beam pattern) and beam pattern design (desired auto-correlation beam pattern) in a Multiple-Input- Multiple-Output (MIMO) radar configuration. The quartic optimization problem, with a finite alphabet constraint on the probing signal and using Quadrature Phase Shift Keying (QPSK) in a multiplexed antenna system, is solved through a Fourier series approximation of the desired beam pattern by exploiting a block circulant property of the transmit signal matrix. The mean square error between an ideal and the proposed crosscorrelation beam pattern is -35 dB enhancing the attractiveness of the proposed approach. [less ▲]Detailed reference viewed: 85 (12 UL) Project NUMTEST: Assessing basic number competence without languageGreisen, Max ; Hornung, Caroline ; Schiltz, Christine Poster (2018, June 28)Although numerical skills are essential in modern societies, 5- 7 % of the population suffer from mathematical learning disabilities. Due to the hierarchical nature of mathematical knowledge, screening ... [more ▼]Although numerical skills are essential in modern societies, 5- 7 % of the population suffer from mathematical learning disabilities. Due to the hierarchical nature of mathematical knowledge, screening during the earliest stages of learning is essential to intervene efficiently. While different screening tools exist, they rely on verbal instructions and task content, hampering their usefulness in linguistically heterogeneous young school populations. We developed a computerized task that requires subjects to encode both auditory and visual numerical information to successfully respond to the task’s demands. For task instruction, participants were presented a video showing a person correctly solving three easy items of the task, before moving on to a practice session of three different items. If any item was solved incorrectly, the entire practice session was repeated for the participant. We administered the task to a sample of first grade students and collected participant’s performance in standardized addition, subtraction and number comparison (1 & 2-digit) tasks. A multivariate analysis with practice repetition as between-subject factor on the four standardized control measures revealed that participants that repeated the practice session scored significantly lower in three out of four dependent measures. These results suggest that the immediate understanding (i.e. practice items solved correctly on the first try) of our task, requiring deductive reasoning and an abstract, format-independent representation of quantity, is able to differentiate between high and low performers on standardized measures of basic math competence non-verbally at an early stage of learning. Implications and limitations will be discussed. [less ▲]Detailed reference viewed: 39 (1 UL) A Faithful Semantic Embedding of the Dyadic Deontic Logic E in HOLBenzmüller, Christoph ; Farjami, Ali ; Parent, Xavier Poster (2018, June 16)Detailed reference viewed: 18 (5 UL) Translanguaging For Learning: A Study of Multilingual Practices in Primary Schools in LuxembourgDegano, Sarah Poster (2018, June 02)Detailed reference viewed: 54 (14 UL) Automatic discrimination of digits and letters in first graders and adults: an EEG Fast Periodic Visual Stimulation study.Lochy, Aliette ; Schiltz, Christine Poster (2018, June)Both letters and digits are arbitrary visual shapes that are distinguished into categories only after cultural acquisition. The observation that digits are easier to identify than letters has been ... [more ▼]Both letters and digits are arbitrary visual shapes that are distinguished into categories only after cultural acquisition. The observation that digits are easier to identify than letters has been repeatedly reported in the literature (Shubert, 2017). In the present study, we used a Fast Periodic Visual Stimulation approach with EEG recordings to assess the automatic discrimination of letters and digits from each other in 1st grade children (N=17) and in adults (N=18). Participants viewed 40 sec sequences (3 repetitions per condition) of frequent stimuli (letters or digits) at a fast periodic rate (adults: 10Hz, children: 6Hz), in which rare stimuli (the other category of alphanumeric symbols) were periodically inserted (every five items, e.g., adults: at 2Hz, children: at 1.2Hz). Results showed discrimination responses in both groups in posterior occipito-temporal regions with clear changes in lateralization patterns. In children, stimuli contained only single elements. Responses were right-lateralized for digits among letters, and revealed a trend for left-lateralization for letters among digits. In adults, when stimuli contained only 1 character, both letters and digits gave rise to responses in the RH. However, when strings of characters were presented, then letters were discriminated from digits in the LH. These findings show a developmental pattern where single elements in children seem to be processed like strings of elements in adults. [less ▲]Detailed reference viewed: 32 (3 UL) An Offline Dictionary Attack Against zkPAKE ProtocolLopez Becerra, José Miguel ; Ryan, Peter ; Sala, Petra et alPoster (2018, June)Password Authenticated Key Exchange (PAKE) allows a user to establish a strong cryptographic key with a server, using only knowledge of a pre-shared password. One of the basic security requirements of ... [more ▼]Password Authenticated Key Exchange (PAKE) allows a user to establish a strong cryptographic key with a server, using only knowledge of a pre-shared password. One of the basic security requirements of PAKE is to prevent o ine dictionary attacks. In this paper, we revisit zkPAKE, an augmented PAKE that has been recently proposed by Mochetti, Resende, and Aranha (SBSeg 2015). Our work shows that the zkPAKE protocol is prone to o ine password guessing attack, even in the presence of an adversary that has only eavesdropping capabilities. Therefore, zkPAKE is insecure and should not be used as a password-authenticated key exchange mechanism [less ▲]Detailed reference viewed: 65 (11 UL) Logitrank Based Measures of Joint Income and Wealth Distributions: Inequality in the U.S. and EuropeChauvel, Louis ; Bar-Haim, Eyal ; Van Kerm, Philippe et alPoster (2018, June)Detailed reference viewed: 65 (8 UL) Perceived competence congruence and its effects on the willingness to communicate and foreign language anxiety of the foreign language studentBotes, E'louise ; Stadler, Matthias ; Greiff, Samuel Poster (2018, June)Detailed reference viewed: 44 (2 UL) Building Bridges Across Heritage SilosKontiza, Kalliopi; Jones, Catherine ; Padfield, Joseph et alPoster (2018, June)This research considers how best to cross the divides that exist between: (1) disparate practices between research fields (2) disparate interpretations of shared cultural heritage by the public and (3 ... [more ▼]This research considers how best to cross the divides that exist between: (1) disparate practices between research fields (2) disparate interpretations of shared cultural heritage by the public and (3) disparate cultural heritage objects. [less ▲]Detailed reference viewed: 17 (1 UL) Identification patterns and subjective well-being in native and migrant emerging adults: The mediating role of self-efficacyStogianni, Maria ; Murdock, Elke Poster (2018, May 18)Background: Luxembourg is one of the most diverse countries in Europe with a foreign population percentage of 47%. National identification processes become complex for young adults growing up in this ... [more ▼]Background: Luxembourg is one of the most diverse countries in Europe with a foreign population percentage of 47%. National identification processes become complex for young adults growing up in this multicultural context with important implications for psychological outcomes. Research has shown that salience of national identification is heightened within this multicultural context (Murdock, Hirst, & Ferring, 2014) while higher levels of national identification are associated with life satisfaction and better health outcomes. Other findings suggest that intercultural contact can contribute to the development of a shared identity in highly diverse areas. The aim of this study was to investigate differences in identification patterns among native and non-native emerging adults and potential factors that mediate their impact on subjective well-being. As the native population is almost in the minority within its own country, we wanted to explore the relationships between well-being, ethnic, and transnational identification among this group. Methods: The sample included 260 young adults, ranging from 18 to 29 years old (M = 21.78, SD = 2.36). Participants were native citizens of Luxembourg and immigrants from different ethnic backgrounds. They completed standardized self-report questionnaires, including the Satisfaction with Life Scale and the General Self-Efficacy Scale. Identification with Luxembourg was assessed with the Multigroup Ethnic Identity Measure. Based on previous studies (van de Vijver et al, 2015), a 7-item scale was developed for the assessment of cosmopolitan/transnational identification, including items that assess beliefs about global citizenship and the level of contact with people from different ethnic groups. Results: All participants reported high levels of Luxembourgish and cosmopolitan identification with average scores M = 3.23 (SD = .79) and M = 4.15 (SD = .49) respectively. There were no significant differences for Luxembourgish identification and well-being between natives and non-natives but participants with migratory background scored significantly higher on the cosmopolitan identity scale. Luxembourgish and cosmopolitan identity correlated positively with self-efficacy in both groups and self-efficacy perceptions were positively related to well-being. To examine the direct and indirect relationships among these variables, we tested path mediation models with the two identity domains as predictors. The first model tested the mediating effect of self-efficacy on the relationship between identification patterns and well-being among native Luxembourgish citizens. The model showed a good fit χ²(1, N = 112) = .087, p = .768, RMSEA = .000, CFI = 1.00, indicating that ethnic identity was a significant predictor of self-efficacy perceptions which indeed mediated the effect of ethnic identification on well-being. Ethnic and transnational identification were not directly associated with the outcome variable. A second path model tested these relationships in the immigrant group χ²(1, N =145) = 2.452, p = .117, RMSEA = .100, CFI = .946. Neither identity component (Luxembourgish or cosmopolitan identity) was a significant predictor of subjective well-being but the findings suggest a mediating effect of self-efficacy on the relationship between transnational identification and well-being. Discussion: The present study contributes to the literature by exploring potential individual difference variables that affect the link between identification patterns and life satisfaction. [less ▲]Detailed reference viewed: 61 (11 UL) Associations of inequality of educational opportunities and later-life cognitive trajectoriesLeist, Anja ; Bar-Haim, Eyal ; Chauvel, Louis Poster (2018, May 03)Detailed reference viewed: 84 (5 UL) How to threaten male gamers: The effects of stereotype threat on video game performanceWagener, Gary L.; Melzer, André Poster (2018, May)A total of 70 participants (47.1% men) took part in a lab experiment that manipulated stereotype threat (i.e., the risk of confirming a negative stereotype about one’s group) between playing a video game ... [more ▼]A total of 70 participants (47.1% men) took part in a lab experiment that manipulated stereotype threat (i.e., the risk of confirming a negative stereotype about one’s group) between playing a video game (Bejeweled 3). Participants performed generally worse after reading a fictitious article on gaming research that women would still play less and perform worse in games than men (ST condition). In contrast to males, however, female participants reported greater frustration from reading this article than their colleagues who read that women and men no longer differ in terms of playing frequency and performance skills (no ST condition). Interestingly, a reverse pattern of results was obtained for male participants, who reported a stronger negative effect of the article in the no ST condition on their ability to show their best gaming performance. Apparently, stereotype threat may affect video game performance both for women and men, but for different reasons. [less ▲]Detailed reference viewed: 286 (11 UL) On Standardised UAV Localisation and Tracking Systems in Smart CitiesSamir Labib, Nader ; Brust, Matthias R. ; Danoy, Grégoire et alPoster (2018, May)In the near future, more than two thirds of the world’s population is expected to be living in cities and hence, with the aim of being proactive and finding innovative and sustainable solutions ... [more ▼]In the near future, more than two thirds of the world’s population is expected to be living in cities and hence, with the aim of being proactive and finding innovative and sustainable solutions, governments have made smart cities one of their priority areas of research. Smart cities are sustainable, inclusive and prosperous greener cities that foster enabling smart Information and Communication Technologies (smart ICT) like Internet-of-Things (IoT), cloud computing and big data to facilitate services such as mobility, governance, utility and energy management. As these services depend heavily on data collected by sensors, Unmanned Aerial Vehicles (UAVs) have quickly become one of the promising IoT devices for smart cities thanks to their mobility, agility and customizability of onboard sensors. UAVs found use in a wide array of applications expanding beyond military to more commercial ones, ranging from monitoring, surveillance, mapping to parcel delivery and more demanding applications that require UAVs to operate in heterogeneous swarms in a shared low-altitude airspace over populated cities. However, as the number of UAVs continues to grow and as their sensing, actuation, communication and control capabilities become increasingly sophisticated, UAV deployment in smart cities is faced with a set of fundamental challenges in their safe operation and management. These challenges emphasize the need for establishing globally-harmonised regulations and internationally-agreed-upon technical standards to govern the rapid technological advancements, as well as ensure a fair economy by encouraging market competition and lowering barriers to entry for newcomers. As various Standardisation Development Organisations (SDOs) recently recognised the need, importance and potential of such regulations, most have established dedicated working groups addressing UAVs. However, most current SDO committees focus on aspects such as vehicle categorisation, specifications and operational procedures, but one usually overlooked elementary topic is UAV localisation. Due to its importance and close relation to other technical subsystems, the lack of a resilient, scalable and efficient standardised UAV localisation and tracking system is one of the main obstructing barriers hindering the integration and interoperability of UAV swarms in smart cities and hence impeding the realisation of their vast application benefits. In this work, we focus on studying the fundamental technical requirements, specifications and functions of such UAV localisation and tracking system, and explore its relationship to and importance in 1) optimising path planning, flight scheduling and utilising shared airspace, 2) collision avoidance and conflict resolution in highly populated residential areas and 3) addressing privacy and data protection concerns that could arise from UAV monitoring and surveillance applications. Furthermore, for each of the three aspects, we analyse current SDOs efforts such as those put forth by EASA, EUCARE WG73 and ISO TC20/SC16 on UAV systems, ISO JTC1/SC41 on IoT and related technologies and ISO JTC1/SC27, EU Directive 95/46 EC and GDPR on security, privacy and data protection, in order to identify and prioritise future research questions in relation to UAV localisation, aiming to make a contribution towards narrowing the gap between research and existing technical standards by encouraging multimode standardisation. This research was conducted in collaboration with ILNAS - the Institut Luxembourgeois de la Normalisation, de l’Accréditation, de la Sécurité et qualité des produits et services (ILNAS) under the authority of the Minister of Economy, Luxembourg. [less ▲]Detailed reference viewed: 68 (19 UL) A Standardized Broker Model in Smart CitiesLiu, Chao ; Varrette, Sébastien ; Brust, Matthias R. et alPoster (2018, May)As urban residents are expected to represent more than 60 per cent of the world’s population by 2050, the current developments and interests in the “Smart City” concept are essential to enable the ... [more ▼]As urban residents are expected to represent more than 60 per cent of the world’s population by 2050, the current developments and interests in the “Smart City” concept are essential to enable the successful transition to this new era. This paradigm relies on the integration of emerging Information and Communication Technologies (ICT), such as the Internet of Things (IoT), Cloud Computing, Big Data to manage assets and resources efficiently while facilitating the planning, construction, management and smart services within cities. While smart cities aim to enhance the quality, performance and interactivity of urban services at reduced cost, their realization is faced by many regulatory and technical challenges. Among these challenges, is the integration of renewable energy resources to the utility system of smart cities motivated by the increasingclimate change concerns. Adding further to its complexity, is the challenge of incorporating multiple renewable energy retailers in the same region each with their own pricing strategies due to the lack of a standardized metering indicator and billing system. These challenges create a need for an intelligent and standardized cloud-based energy broker to satisfying the end-user requests, and minimize expenses by efficiently selecting the most suitable energy retailer. In our work, a particular focus is raised towards the optimization of such energy brokering service which is motivated by the orchestration of a brokering role aiming to improve user experience and interaction with smart city services. Hence our main contribution is proposing a standardized intelligent broker model with smart trading strategies to cope with the dynamics and complexity of the energy retail market, while allocating energy resources based on endusers’ demands. This is achieved through the following steps: 1) studying a complete model of the broker service and involved parties within the exposed framework. 2) proposing a multiobjective heuristic to provide a dynamic optimization of the grid operations and resources, with full cyber-security, within the boundaries of the city. 3) analyzing the gaps among industry practices, market requirements and current technical standardization efforts at ISO/IEC JTC 1/ SC 38 (Cloud Computing and distributed platform) in order to pave the way to establishing standards in metering indicators and billing principles for cloud services this while keeping in mind privacy and data protection risks and regulations enforced by ISO JT1/SC 27 and EU General Data Protection Regulation effective May 2018. This research was conducted in collaboration with ILNAS - the Institut Luxem- bourgeois de la Normalisation, de l’Accréditation, de la Sécurité et qualité des produits et services (ILNAS) under the authority of the Minister of Economy, Luxembourg. [less ▲]Detailed reference viewed: 35 (3 UL) Teachers´ competence and efficacy beliefs on inclusive education in Luxembourg - effect of a training modulePit-Ten Cate, Ineke ; Krischler, Mireille Poster (2018, April 26)Detailed reference viewed: 31 (3 UL) Towards multiscale data fusion of high-resolution space borne and terrestrial datasets over Tristan da CunhaBackes, Dietmar ; Teferle, Felix Norman ; Abraha, Kibrom Ebuy et alPoster (2018, April 10)Ever improving low cost, lightweight and easy to use sensing technologies are enabling the capture of rich 3D Datasets to support an unprecedented range of applications in Geosciences. Especially low-cost ... [more ▼]Ever improving low cost, lightweight and easy to use sensing technologies are enabling the capture of rich 3D Datasets to support an unprecedented range of applications in Geosciences. Especially low-cost LiDAR systems as well as optical sensors, which can be deployed from terrestrial or low altitude aerial platforms, allow the collection of large datasets without detailed expert knowledge or training. Dense pointcloud derived from these technologies provide an invaluable source to fill the gap between highly precise and accurate terrestrial topographic surveys and large area Digital Surface Models (DSMs) derived from airborne and spaceborne sensors. However, the collection of reliable 3D pointclouds in remote and hazardous locations remains to be very difficult and costly. Establishing a reliable georeference, ensuring accuracy and data quality as well as merging such rich datasets with existing or space borne mapping provide additional challenges. The presented case study investigates the data quality and integration of a heterogeneous dataset collected over the remote island of Tristan da Cunha. High-resolution 3D pointclouds derived by TLS and drone Photogrammetry are merged with space borne imagery while preserving the accurate georeference provided by Ground Control derived from geodetic observations. The volcanic island of Tristan da Cunha located in the centre of the Southern Atlantic Ocean is one of the most remote and difficult to access locations on the planet. Its remote location, rough climatic conditions and consistent cloud coverage provides exceptional challenges for terrestrial, aerial as well as space borne data acquisition. Amongst many other scientific installations, the island also hosts a continuous GNSS station observation and monitoring facilities operated by the University of Luxembourg, which provided the opportunity to conduct a local terrestrial data acquisition campaign consistent with a terrestrial ground survey, Laserscanning and an image acquisition from a low-cost drone. The highly accurate Ground Control network, observed by GNSS and total station, provides a reliable georeference. Pointclouds were acquired around the area of the harbour using a Leica P20 terrestrial Laserscanner, as well as drone Photogrammetry based on images collected by a low-cost DJI Phantom3 drone. To produce a map of the complete island a comprehensive dataset of high-resolution space borne imagery based on the Digital Globe WorldView constellation was acquired which provided high resolution mapping information. The case study presents a cross-validation of terrestrial, low altitude airborne as well as spaceborne datasets in terms coregistration, absolute georeference, scale, resolution and overall data quality. Following the evaluation a practical approach to fuse this heterogeneous dataset is applied which aims to preserve overall data quality, local resolution and accurate georeference and avoid edge artefacts. The conclusions drawn from our preliminary results provide some good practice advice for similar projects. The final topographic dataset enables mapping and monitoring of local geohazards as, e.g. coastal erosion and recent landslides thus also supporting the local population. [less ▲]Detailed reference viewed: 151 (32 UL) Vertical Land Movements and Sea Level Changes around South Georgia IslandTeferle, Felix Norman ; Hunegnaw, Addisu ; Abraha, Kibrom Ebuy et alPoster (2018, April 09)South Georgia Island in the Southern Atlantic Ocean is a key location for the seismic, geomagnetic and oceanic global monitoring networks. In its sub-Antarctic location, the island is largely covered by ... [more ▼]South Georgia Island in the Southern Atlantic Ocean is a key location for the seismic, geomagnetic and oceanic global monitoring networks. In its sub-Antarctic location, the island is largely covered by mountain glaciers which have been reported to be retreating due to climatic change. Furthermore, during past glaciation periods the island and its shelf area have been ice covered as was revealed by scarring of the sub-oceanic topography. Together with ongoing tectonics along the North Scotia Ridge, these processes have the ability to produce significant uplift on local to regional scales, affecting the measurements of the tide gauge (GLOSS ID 187) at King Edward Point (KEP). Furthermore, with its mid-ocean location, the tide gauge is of particular interest to satellite altimetry calibrations over the Southern Atlantic and Southern Oceans. With the establishment of five GNSS stations on the islands during 2013 to 2015 and the scientific analysis of these data within the global network of stations of the International GNSS Service Tide Gauge Benchmark Monitoring (TIGA) working group, it has now become possible to study present-day vertical land movements of the region and their impacts on, for example, regional sea level. Furthermore, together with four precise levelling campaigns of the KEP benchmark network in 2013, 2014 and two in 2017, it has also been possible to investigate the very local character of the vertical motions near KEP, ie. the stability of the jetty upon which the tide gauge is mounted. In this study, we will present the still preliminary results from the GNSS and levelling measurements and will discuss their impact on the sea level record from the KEP tide gauge. Our measurements show that while South Georgia Island and the area around KEP are rising, the jetty and tide gauge are subsiding, leading to a disagreement in the observed sea level change from the tide gauge and satellite altimetry. In order to improve the agreement between these sea level measurements both local and regional vertical land movements need to be monitored. [less ▲]Detailed reference viewed: 94 (4 UL) Overcoming language barriers in early mathematics instruction with “MaGrid” - a language-neutral training tool for multilingual school settingsCornu, Véronique ; Pazouki, Tahereh ; Schiltz, Christine et alPoster (2018, April 08)Mathematical knowledge at the onset of formal schooling paves the way for children’s achievement in formal mathematics (e.g. Duncan et al., 2007; Watts et al., 2014). Hence, it is crucial to equip ... [more ▼]Mathematical knowledge at the onset of formal schooling paves the way for children’s achievement in formal mathematics (e.g. Duncan et al., 2007; Watts et al., 2014). Hence, it is crucial to equip children with sound basic mathematical competencies by deploying effective teaching interventions during preschool years. However, multilingual school settings, such as Luxembourg (65% of the pupils are second language learners) pose a special challenge for instruction. Non-native pre-schoolers perform lower on early mathematics tests than their age-matched peers (Bonifacci et al., 2016; Kleemans et al., 2011). This gap is most likely due to missing out on learning opportunities, as a result of lower proficiency in the language of instruction. To provide equal access to early mathematics education for all children, we developed a language-neutral early mathematics training tool, the “MaGrid”-app. This innovative training tool has been evaluated, so far, in two studies in multilingual Luxembourg. In a first study, children from five classrooms (N = 68) used the tool to train visuo-spatial abilities, an important predictor of mathematical abilities (see e.g. Mix et al., 2016), over ten weeks (2x20min/week). At post-test, significant gains in the visuo-spatial domain were observed, compared to children from “teaching-as-usual” classrooms (N = 57). In a second study, we elaborated a comprehensive language-neutral early mathematics intervention, with “MaGrid” at its core. Findings from both training studies will be presented in detail and the importance of domain-specific versus domain-general precursors, as well as practical implications, will be discussed. [less ▲]Detailed reference viewed: 189 (30 UL) Language influence on mathematics achievement in French-German biliterate ninth gradersMartini, Sophie Frédérique ; Ugen, Sonja Poster (2018, April)Detailed reference viewed: 45 (10 UL) A Trellis-Based SAT ProblemFranck, Christian Poster (2018, April)Detailed reference viewed: 36 (2 UL) Attitudes towards multiculturalism: Majority and minority group perspectivesStogianni, Maria ; Murdock, Elke Poster (2018, March 13)Detailed reference viewed: 84 (24 UL) A Changing Jurisdictional Framework of Investment Treaty Arbitration: Quo Vadis?Radović, Relja Poster (2018, March 01)Detailed reference viewed: 38 (1 UL) When versus what: How time and valence of contextual descriptions modulate affective ERP components in response to facial expressionsRischer, Katharina Miriam ; MacGregor, Oskar; Savallampi, Mattias et alPoster (2018, March)Detailed reference viewed: 10 (1 UL) Fourth-graders' competence beliefs in mathematicsVillanyi, Denise ; Wollschläger, Rachel ; Martin, Romain et alPoster (2018, February 15)Detailed reference viewed: 63 (12 UL) Using higher-order adjoints to accelerate the solution of UQ problems with random fieldsHale, Jack ; Hauseux, Paul ; Bordas, Stéphane Poster (2018, January 08)A powerful Monte Carlo variance reduction technique introduced in Cao and Zhang 2004 uses local derivatives to accelerate Monte Carlo estimation. This work aims to: develop a new derivative-driven ... [more ▼]A powerful Monte Carlo variance reduction technique introduced in Cao and Zhang 2004 uses local derivatives to accelerate Monte Carlo estimation. This work aims to: develop a new derivative-driven estimator that works for SPDEs with uncertain data modelled as Gaussian random fields with Matérn covariance functions (infinite/high-dimensional problems) (Lindgren, Rue, and Lindström, 2011), use second-order derivative (Hessian) information for improved variance reduction over our approach in (Hauseux, Hale, and Bordas, 2017), demonstrate a software framework using FEniCS (Logg and Wells, 2010), dolfin-adjoint (Farrell et al., 2013) and PETSc (Balay et al., 2016) for automatic acceleration of MC estimation for a wide variety of PDEs on HPC architectures. [less ▲]Detailed reference viewed: 149 (22 UL) The influence of language and other background variables on mathematics achievement in Luxembourgish studentsMartini, Sophie Frédérique ; Ugen, Sonja Poster (2018, January)Detailed reference viewed: 36 (5 UL) Critical reflexivity in the professional development of professional devlopers: A co-autoethnographic explorationWilmes, Sara ; Siry, Christina ; Te Heesen, Kerstin et alPoster (2018, January)Detailed reference viewed: 34 (2 UL) Assessing the Performance of a Two-Step Dynamic Demand Estimation Model on Large-Scale Congested NetworksCantelmo, Guido ; Viti, Francesco Poster (2018, January)Detailed reference viewed: 107 (21 UL) On Vulnerability Evolution in Android AppsGao, Jun ; Li, Li; Pingfan, Kong et alPoster (2018)Detailed reference viewed: 56 (20 UL) The low-dimensional algebraic cohomology of the Witt and the Virasoro algebraEcker, Jill Marie-Anne ; Schlichenmaier, Martin Poster (2018)Detailed reference viewed: 37 (4 UL) Cross-border vocational education and training as a process of cross-border learning. The example of the Saarland-Lorraine border regionNienaber, Birte ; Funk, Ines; Dörrenbächer, H. PeterPoster (2018)Detailed reference viewed: 19 (0 UL) Entwicklung eines PV/Thermie-basierten Wärmepumpensystems auf der Basis von CO2 DirektverdampfungRullof, Johannes ; Lambers, Klaus Jürgen; Blieske, Ulf et alPoster (2018)Detailed reference viewed: 17 (0 UL) Poster: Performance Evaluation of an Open-Source Audio-Video Bridging/Time-Sensitive Networking Testbed for Automotive EthernetXu, Teng Andrea; Adamsky, Florian ; Turcanu, Ion et alPoster (2018)Automotive Ethernet (AE) is becoming more and more relevant to the automotive industry due to its support of emerging in-car applications, which have high bandwidth demands and stringent requirements in ... [more ▼]Automotive Ethernet (AE) is becoming more and more relevant to the automotive industry due to its support of emerging in-car applications, which have high bandwidth demands and stringent requirements in terms of latency and time synchronization. One of the standards under consideration for AE is IEEE 802.1 Audio Video Bridging (AVB)/Time Sensitive Networking (TSN) that provides deterministic data link layer and bounded latency to real-time traffic classes. So far, this protocol stack has only been evaluated using either simulations or proprietary and expensive platforms. In this paper, we design a real testbed system for AE using general-purpose single-board computers and conduct experiments to assess the real-time performance of an open-source AVB/TSN implementation. Our preliminary results show that even under heavy load, AVB/TSN can fulfil the latency requirements of AE while keeping a constant latency variation. [less ▲]Detailed reference viewed: 150 (21 UL) The role of metacognition in low vs high road transfer of complex problem solving skillsJohnson, Ashley ; Krieger, Florian ; Nicolay, Björn Fabrice et alPoster (2018)Detailed reference viewed: 87 (10 UL) La satisfaction de vie des adolescents au LuxembourgCatunda, Carolina ; Heinz, Andreas ; Willems, Helmut Poster (2018)Dans l’objectif d’examiner la santé et le bien-être subjectif des jeunes en âge scolaire, l’enquête HBSC a été mis en place dans plusieurs pays de l’Europe. La satisfaction de vie est un concept central ... [more ▼]Dans l’objectif d’examiner la santé et le bien-être subjectif des jeunes en âge scolaire, l’enquête HBSC a été mis en place dans plusieurs pays de l’Europe. La satisfaction de vie est un concept central dans l’évaluation du bien-être. Ainsi, l’objectif de la présente publication est de rendre compte de la satisfaction de vie des adolescents du Luxembourg, ainsi que d’identifier les tendances selon le sexe et l’âge. Méthode : Pour l’enquête HBSC 2014, la cohorte luxembourgeoise a été menée dans les écoles suivant le curriculum national pendant l’année scolaire 2013 / 2014. Au total, 7 757 élèves âgés de 11 à 18 ans, de 590 classes sélectionnées aléatoirement, ont participé à l’enquête. Leurs professeurs ont distribué un questionnaire en français / allemand composé, entre autres, de l’échelle de Cantril (1965) pour évaluer la satisfaction de vie et de questions sociodémographiques. Résultats : L'analyse des résultats montre une corrélation significative négative entre la satisfaction de vie et l’âge, les plus âgés ayant donc une moins bonne satisfaction de vie. Lorsque les analyses ont été faites séparément selon le sexe, ces tendances diffèrent. En ce que concerne les filles, les corrélations sont plus fortes. Par contre, pour les garçons, les liens sont moins importants. Dans les deux cas, les corrélations restent significatives. Des comparaisons de moyennes entre les sexes dans les différentes tranches d’âge indiquent aussi une satisfaction de vie plus élevé chez les garçons que les filles. Conclusion : Ces résultats suggèrent que la satisfaction de vie pendant l’adolescence diminue avec l’âge et que les garçons sont plus satisfaits de leur vie que les filles. Ces données corroborent les tendances retrouvés dans d’autres pays participants de l’enquête HBSC, ainsi que la littérature sur le sujet. Des analyses plus fines doivent être faites dans cette cohorte en prenant en considération ces différences. [less ▲]Detailed reference viewed: 26 (1 UL) A Reduced Order Kalman Filter for Computational Fluid-Dynamics ApplicationsIntroini, Carolina; Cammi, Antonio; Lorenzi, Stefano et alPoster (2018)Detailed reference viewed: 62 (4 UL) Executive functions as moderators of the worked example effect on statistical reasoning. A replication studyBichler, S.; Bühner, M.; Greiff, Samuel et alPoster (2018)Detailed reference viewed: 21 (0 UL) Subjective Health Complaints in Adolescence - Validity of the HBSC Symptom Checklist in LuxembourgCatunda, Carolina ; Heinz, Andreas ; Willems, Helmut Poster (2018)The HBSC Symptom Checklist (HBSC-SCL) consists on an eight-item scale developed for the Health Behaviour in School-aged Children survey to measure adolescent health complaints. Although it was developed ... [more ▼]The HBSC Symptom Checklist (HBSC-SCL) consists on an eight-item scale developed for the Health Behaviour in School-aged Children survey to measure adolescent health complaints. Although it was developed based on a RASCH measurement analysis which proved that the items are indicators of a unidimensional latent trait, some studies suggests a two highly correlated dimensions. The objective of this study is to test the validity of the Luxembourgish version of the HBSC-SCL. Methods: The 2014 HBSC Luxembourg survey took place during the 2013/14 school year. A total of 590 classes following the national curriculum were randomly selected and 7 757 students aged from 11 to 18 years old responded to the questionnaire translated to both French and German distributed by their teachers. Findings: First, the Kaiser-Meyer-Olkin criterion and the Bartlett sphericity test indicated the use of a factor analysis (KMO=.88; p<.001). A Principal Component Analysis with Varimax Rotation (with the Eigenvalues over 1) and a scree plot test suggests a one factor matrix with a total variance explained of 47%. Discussion: Factor analysis support the existence of a single factor for the Luxemburgish population in accordance with the preliminary model developed. Literature have mixed results, with the possibility to compute one or two health complaints scores. More studies should confirm these findings but as the internal consistency possibly depends on the country studied, it is recommended this be systematically checked. [less ▲]Detailed reference viewed: 29 (9 UL) H2020 PROJECT CEASEVAL. Evaluation of the Common European Asylum System under Pressure and Recommendations for Further DevelopmentNienaber, Birte ; Vianelli, Lorenzo ; Paraschivescu, Claudia et alPoster (2018)Detailed reference viewed: 41 (8 UL) First Vertical Land Movement Estimates on South Georgia Island: An Impact Study on Sea Level Change from Tide Gauge and Altimetry MeasurementsTeferle, Felix Norman ; Hunegnaw, Addisu ; Abraha, Kibrom Ebuy et alPoster (2017, December 11)South Georgia Island in the Southern Atlantic Ocean has been a key location for the seismic, geomagnetic and oceanic global monitoring networks. However, no permanent geodetic monitoring station had been ... [more ▼]South Georgia Island in the Southern Atlantic Ocean has been a key location for the seismic, geomagnetic and oceanic global monitoring networks. However, no permanent geodetic monitoring station had been established there despite the lack of observations from this region within, for example, the International GNSS Service (IGS) network of Global Navigation Satellite System (GNSS) stations. Then, in 2013 the King Edward Point (KEP) Geodetic Observatory was established with a focus on sea level studies and in support of general geoscience applications. Currently, this observatory located roughly half-way along the main island and along its northern coastline, consists of two GNSS stations (KEPA and KRSA) with local benchmark networks, allowing the height determinations from the GNSS antennas to be transferred to the KEP tide gauge (GLOSS ID 187) and forming a height reference within the International Terrestrial Reference Frame. In late 2014, three additional GNSS stations (SG01, SG02 and SG03) were established, all on small islands at the perimeter of the main island. Together the stations provide the best possible opportunity to study various geophysical processes in the region. With the GNSS-derived position time series partly reaching over 4.5 years in length, it has become possible to provide first estimates of vertical land movements for the island and KEP with its surrounding area. Together with four precise levelling campaigns of the benchmark network in 2013, 2014 and two in 2017, it has also been possible to investigate the very local character of the vertical motions, ie. the stability of the jetty upon which the tide gauge is mounted. Our measurements show that while South Georgia Island and the area around KEP are rising, the jetty and tide gauge are subsiding. In this study, we will present the preliminary results from the GNSS and levelling measurements and will discuss their impact on the sea level record from the KEP tide gauge which is ideally situated in a mid-ocean location for satellite altimetry calibration over the Southern Atlantic and Southern Oceans. [less ▲]Detailed reference viewed: 85 (10 UL) Poster: Characterizing Driving Behaviors Through a Car Simulation PlatformFaye, Sébastien ; Jafarnejad, Sasan ; Costamagna, Juan et alPoster (2017, November 27)Human mobility has opened up to many themes in recent years. Human behavior and how a driver might react to certain situations, whether dangerous (e.g. an accident) or simply part of the evolution of new ... [more ▼]Human mobility has opened up to many themes in recent years. Human behavior and how a driver might react to certain situations, whether dangerous (e.g. an accident) or simply part of the evolution of new technologies (e.g. autonomous driving), leaves many avenues to be explored. Although experiments have been deployed in real situations, it remains difficult to encounter the conditions that certain studies may require. For this reason, we have set up a driving simulator (comprising several modules) that is able to reproduce a realistic driving environment. Although, as the literature has already demonstrated, the conditions are often far from reality, simulation platforms are nonetheless capable of reproducing an incredibly large number of scenarios on the fly. In this poster, we explain how we conceived the simulator, as well as the system we developed for collecting metrics on both the driver and the simulation environment. In addition, we take advantage of this conference to publicly share a dataset consisting of 25 drivers performing the same road circuit on the "Project Cars" game. [less ▲]Detailed reference viewed: 134 (16 UL) Early life stress reduces neuropathic pain in adulthood -is alteration of spinal microglial reactivity critically involved?Genty, Julien ; Tetsi Nomigni, Milène ; Anton, Fernand et alPoster (2017, November 14)Growing evidence underlines the association between early life adversity and persistent alterations of neural, endocrine and immune functions that may be accompanied by a host of disease patterns such as ... [more ▼]Growing evidence underlines the association between early life adversity and persistent alterations of neural, endocrine and immune functions that may be accompanied by a host of disease patterns such as chronic pain in later life. Neuropathy is a debilitating condition presenting a substantial cooccurrence with stress related disorders. Despite the established overlapping of biochemical pathways involved in the etiology of these disorders, the intricacy of their mutual interdependence remains. In this context, immunocompetent cells are largely affected during chronic stress and are a key factor in the sensitization of nociceptive dorsal horn neurons. The goal of the present study was to investigate the impact of maternal separation (MS), a wellestablished model of early life stress in rodents, on chronic constriction injury (CCI)induced neuropathic pain and to reveal the relevance of spinal microglia activation and proinflammatory cytokine regulation. For this purpose 12 groups of rats were exposed to different combinations of stress condition, CCIinjury and pharmacological treatment. Noxious sensitivity was tested during baseline conditions as well as during subsequent neuropathic and pharmacological treatment conditions. Von Frey hair and the cold plate tests were used for the assessment of mechanical and cold hyperalgesia/allodynia. Amphotericin B, a substance known to activate monocytes and macrophages in the periphery and microglial cells in the CNS was administered to subgroups of animals. At the end of the protocol, rats were sacrificed to assess microglial activation using qPCR and immunohistochemistry. Our main finding was that maternal separation led to a reduction of CCIrelated pain hypersensitivity (thermal and mechanical hyperalgesia/allodynia). We concomitantly observed a downregulation of Iba 1, mRNA a marker of microglial cells, and of IL1β mRNA, a proinflammatory cytokine that may be released by microglia. According to preliminary results, Amphotericin B in turn seemed to enhance CCI related pain sensitivity, possibly via an activation of microglia. Our results show that MS may lead to a reduction of neuropathy relatedpain in adult age. Stress related dampening of spinal microglial reactivity may play a critical role in this context. [less ▲]Detailed reference viewed: 47 (9 UL) A Product Line of Software Engineering Project CoursesGuelfi, Nicolas ; Capozucca, Alfredo ; Ries, Benoît Poster (2017, November 08)Detailed reference viewed: 70 (11 UL) Reliable Machine Learning for Networking: Key Concerns and ApproachesHammerschmidt, Christian ; Garcia, Sebastian; Verwer, Sicco et alPoster (2017, October)Machine learning has become one of the go-to methods for solving problems in the field of networking. This development is driven by data availability in large-scale networks and the commodification of ... [more ▼]Machine learning has become one of the go-to methods for solving problems in the field of networking. This development is driven by data availability in large-scale networks and the commodification of machine learning frameworks. While this makes it easier for researchers to implement and deploy machine learning solutions on networks quickly, there are a number of vital factors to account for when using machine learning as an approach to a problem in networking and translate testing performance to real networks deployments successfully. This paper, rather than presenting a particular technical result, discusses the necessary considerations to obtain good results when using machine learning to analyze network-related data. [less ▲]Detailed reference viewed: 96 (3 UL) Does physical learning environment matter? Effects after the move to a new campus on the perception of the quality of studiesSteffgen, Georges ; Vesely, Jana; Pinto Costa, Andreia Poster (2017, September 18)The present study examined the effects of a move to a new physical learning environment – Belval Campus – on the students’ satisfaction with the course program in psychology. It was hypothesized that the ... [more ▼]The present study examined the effects of a move to a new physical learning environment – Belval Campus – on the students’ satisfaction with the course program in psychology. It was hypothesized that the move to a new and modern University campus with better study facilities increases course climate, learning promotion, and skill acquisition. Participants were 538 undergraduate students who completed the Bachelor Evaluation Questionnaire, which assessed the perceived quality of the course program as well as five infrastructure and equipment aspects of the new campus. Findings show that students were more satisfied with the classrooms, the capacity of the rooms, and the library facilities, but there was no increase in perceived course climate, learning promotion, and skill acquisition of the students after 6 months nor after 18 months from the move. The implications of these findings for the need to change physical learning environments are discussed and recommendations for the design of learning environments are presented. [less ▲]Detailed reference viewed: 62 (5 UL) Development of an innovative type of shear connection dedicated to the composite columns applicationChrzanowski, Maciej ; Odenbreit, Christoph ; Bogdan, TheodoraPoster (2017, September 13)Detailed reference viewed: 76 (10 UL) Project NUMTEST: Assessing basic number competence without languageGreisen, Max ; Hornung, Caroline; Martin, Romain et alPoster (2017, September 08)While numerical skills are fundamental in modern societies, some estimated 5-7% of children suffer from a mathematical learning disorder, called developmental dyscalculia (DD). Nevertheless, universally ... [more ▼]While numerical skills are fundamental in modern societies, some estimated 5-7% of children suffer from a mathematical learning disorder, called developmental dyscalculia (DD). Nevertheless, universally valid diagnostic instruments are still lacking, as all current DD test batteries are based on language instructions. Consequently, their measurements are tightly linked to the specific language context of test administration and thus their results cannot easily be compared across countries. Here we are showing results of the first two pilot studies of a research project that aims to develop a test for basic math abilities that does not rely on language instruction and minimizes language use. To this aim, video and animation based instructions were implemented on touchscreen devices. A first version of the tasks has been tested with two samples of first grade children in Luxembourg’s fundamental schools, of which half completed the same tasks with traditional verbal instructions. Our results indicate that performance in the experimental group was similar or better than the control group using verbal instructions. Relationships between linguistic background and the sample’s performance on one hand and qualitative usability aspects of nonverbal task instruction and tablet-pc use with young children will be discussed. [less ▲]Detailed reference viewed: 72 (20 UL) Avatar Sex Moderates Aggression in Violent Video Games, But Only for WomenMelzer, André ; Schmidt, Alexander F.Poster (2017, September 07)Three studies tested findings reported by Yang, Huesmann, and Bushman (2014) that playing a male avatar in a violent video game leads to greater aggression than playing a female avatar in the same game ... [more ▼]Three studies tested findings reported by Yang, Huesmann, and Bushman (2014) that playing a male avatar in a violent video game leads to greater aggression than playing a female avatar in the same game. The male avatar effect was confirmed in Study 1 (N=79) for post-game aggression: compared to playing a female character, participants who had played the male fighter in a violent mixed martials arts game chose more Hot Sauce for another participant who allegedly disliked spicy food. In contrast to Yang et al. (2014), however, the male avatar effect was qualified by participant sex, indicating that the effect was more strongly pronounced and only significant for female participants. A similar interaction effect was observed in Study 2 (N=76) and Study 3 (N=70) for in-game aggression: only female participants playing a male avatar showed a greater hit ratio in a mixed martials arts game (Study 2) or a greater number of attacks in a brawler game (Study 3) than their colleagues who played a female avatar. At this stage, the reason for this cross-gender effect is unclear. Given that games allow for behavior (i.e., aggression) independent of socially shared gender norms, we may speculate that for women, male avatars may provide the opportunity to “step out” of prevailing social norms regarding non-aggressive female behavior and adopt the role of the (hyper-)aggressive male. However, this hypothesis needs to be tested in future studies. All three studies additionally tested the mediating effect of male gender stereotype activation that was hypothesized by Yang et al. (2014). In addition to priming violent behavior, and in line with the General Aggression Model, the authors had speculated that playing the male avatar automatically activated male gender stereotypes (i.e., aggressive thoughts and behavior) which then caused aggressive behavior. In order to address this activation hypothesis, we designed an indirect cognitive measure of gender role identity using the Positive-Negative Sex-Role Inventory (PN-SRI: Berger & Krahé, 2013). After participants played the violent game, positive and negative aspects of masculinity and femininity were presented as word fragments in a five-minute response window in Study 1 and 2. Fragment completion rates served as indicators of cognitive activation of male stereotypes. In Study 3, participants used the intact PN-SRI gender attributes to rate the avatar after playing the game. However, both direct and indirect measures failed to corroborate the stereotype activation hypothesis in the present studies: word fragments related to male stereotypes were not completed more often than fragments related to female stereotypes (Study 1 and 2). Also, neither in-game aggression nor success in the game was associated with how masculine participants perceived their fighter (Study 3). At the present stage, thus, the mechanisms underlying the gender effect that participants respond differently when playing a male or female avatar in a violent video game remain unclear. [less ▲]Detailed reference viewed: 453 (3 UL) Energy and momentum distribution of fractional excitations in helical systemsCalzona, Alessio ; Acciai, Matteo; Dolcetto, Giacomo et alPoster (2017, September 05)Detailed reference viewed: 30 (1 UL) The relevance of verbal and visuo-spatial abilities for verbal number skills – what matters in 5 to 6 year olds?Cornu, Véronique ; Schiltz, Christine ; Martin, Romain et alPoster (2017, September)The acquisition of verbal number skills, as defined by the meaningful use of number words, marks a milestone in numerical development. In the present study, we were particularly interested in the question ... [more ▼]The acquisition of verbal number skills, as defined by the meaningful use of number words, marks a milestone in numerical development. In the present study, we were particularly interested in the question, whether verbal number skills are primarily verbal in nature, or if they call upon visuo-spatial processes, reflecting a spatial grounding of verbal number skills. 141 five- to six-year old children were tested on a range of verbal (i.e. vocabulary, phonological awareness and verbal working memory) and visuo-spatial abilities (i.e. spatial perception, visuo-motor integration and visuo-spatial working memory). We were particularly interested in the predictive role of these abilities for children’s verbal number skills (as measured by different counting and number naming tasks). In a latent regression model, basic visuo-spatial abilities, measured by spatial perception and visuo-motor integration, emerge as the most important predictor of verbal number skills. This gives raise to the assumption, that verbal number skills are, despite their verbal nature, spatially grounded in young children. [less ▲]Detailed reference viewed: 90 (13 UL)