Last 7 days
Bookmark and Share    
Full Text
See detailBewertung des Klassenklimas
Heinz, Andreas UL

E-print/Working paper (2018)

In der HBSC-Studie 2014 sollten die Schüler die folgende Aussage zum Klassenklima bewerten: „Die meisten Schüler in meiner Klasse sind nett und hilfsbereit.“ 72 % stimmen dieser Aussage zu, 10 % lehnen ... [more ▼]

In der HBSC-Studie 2014 sollten die Schüler die folgende Aussage zum Klassenklima bewerten: „Die meisten Schüler in meiner Klasse sind nett und hilfsbereit.“ 72 % stimmen dieser Aussage zu, 10 % lehnen sie ab und 18 % wählen die neutrale Mittelkategorie. Getrennt nach Alter und Geschlecht zeigen sich kaum Unterschiede im wahrgenommenen Klassenklima. Allerdings bewerten Schüler des Fondamental und des Secondaire das Klassenklima besser als Schüler des Secondaire technique und des Modulaire. Je besser das Klassenklima bewertet wird, desto zufriedener sind die Schüler mit ihrem Leben und desto mehr mögen sie die Schule. [less ▲]

Detailed reference viewed: 9 (1 UL)
Full Text
See detailQualität der Kommunikation in der Familie
Heinz, Andreas UL

E-print/Working paper (2018)

In der HBSC-Studie 2014 sollten die Schüler vier Aussagen zur Qualität der Kommunikation in ihrer Familie auf einer Skala von 1 (= niedrige Qualität) bis 5 (= hohe Qualität) bewerten. Über 80 % vergeben ... [more ▼]

In der HBSC-Studie 2014 sollten die Schüler vier Aussagen zur Qualität der Kommunikation in ihrer Familie auf einer Skala von 1 (= niedrige Qualität) bis 5 (= hohe Qualität) bewerten. Über 80 % vergeben gute Bewertungen im Bereich von 4 oder 5. Rund 12 % der Schüler bewerten die Qualität der Familienkommunikation im mittleren Bereich (3) und 5 % vergeben niedrige Bewertungen (1 oder 2). Ältere Schüler bewerten die Familienkommunikation schlechter als jüngere. Dementsprechend bewerten Schüler des Fondamental die Familienkommunikation besser als Schüler von Sekundarschulen. Schüler, die eine hohe Qualität angeben, berichten eine geringere Zahl von Gesundheitsbeschwerden. [less ▲]

Detailed reference viewed: 15 (3 UL)
Full Text
See detailMobbing in der Schule
Heinz, Andreas UL

E-print/Working paper (2018)

In der Kindheit und Jugend gemobbt zu werden ist ein Risikofaktor für schlechtere Schulleistungen, aber langfristig auch für Angststörungen im Erwachsenenalter. Daher wurde in der HBSC-Studie 2014 gefragt ... [more ▼]

In der Kindheit und Jugend gemobbt zu werden ist ein Risikofaktor für schlechtere Schulleistungen, aber langfristig auch für Angststörungen im Erwachsenenalter. Daher wurde in der HBSC-Studie 2014 gefragt, wie häufig die Schüler in den vergangenen Monaten in der Schule gemobbt wurden. 73 % waren nicht von Mobbing betroffen, 16 % wurden 1- bis 2-mal gemobbt und 11 % wurden mindestens 2-mal pro Monat gemobbt. Ältere Schüler waren seltener Opfer von Mobbing als jüngere Schüler, wobei Jungen und Mädchen in allen Altersgruppen ähnlich häufig betroffen waren. Dementsprechend waren die Schüler des Fondamental und des Modulaire häufiger betroffen als die Schüler des Secondaire technique und des Secondaire. Schüler, die aus Familien mit einem geringen Wohlstandsniveau stammen, waren häufiger Mobbingopfer als Schüler aus wohlhabenden Familien. Mit der Häufigkeit des Mobbings sinkt die Lebenszufriedenheit und die Zahl der Gesundheitsbeschwerden steigt. [less ▲]

Detailed reference viewed: 8 (3 UL)
Full Text
Peer Reviewed
See detailMajor changes of cell function and toxicant sensitivity in cultured cells undergoing mild, quasi-natural genetic drift
Gutbier, Simon; May, Patrick UL; Berthelot, Sylvie et al

in Archives of Toxicology (2018)

Genomic drift affects the functional properties of cell lines, and the reproducibility of data from in vitro studies. While chromosomal aberrations and mutations in single pivotal genes are well explored ... [more ▼]

Genomic drift affects the functional properties of cell lines, and the reproducibility of data from in vitro studies. While chromosomal aberrations and mutations in single pivotal genes are well explored, little is known about effects of minor, possibly pleiotropic, genome changes. We addressed this question for the human dopaminergic neuronal precursor cell line LUHMES by comparing two subpopulations (SP) maintained either at the American-Type-Culture-Collection (ATCC) or by the original provider (UKN). Drastic differences in susceptibility towards the specific dopaminergic toxicant 1-methyl-4-phenylpyridinium (MPP+) were observed. Whole-genome sequencing was performed to identify underlying genetic differences. While both SP had normal chromosome structures, they displayed about 70 differences on the level of amino acid changing events. Some of these differences were confirmed biochemically, but none offered a direct explanation for the altered toxicant sensitivity pattern. As second approach, markers known to be relevant for the intended use of the cells were specifically tested. The “ATCC” cells rapidly down-regulated the dopamine-transporter and tyrosine-hydroxylase after differentiation, while “UKN” cells maintained functional levels. As the respective genes were not altered themselves, we conclude that polygenic complex upstream changes can have drastic effects on biochemical features and toxicological responses of relatively similar SP of cells. [less ▲]

Detailed reference viewed: 15 (0 UL)
Full Text
See detailEvaluating Vulnerability Prediction Models
Jimenez, Matthieu UL

Doctoral thesis (2018)

Today almost every device depends on a piece of software. As a result, our life increasingly depends on some software form such as smartphone apps, laundry machines, web applications, computers ... [more ▼]

Today almost every device depends on a piece of software. As a result, our life increasingly depends on some software form such as smartphone apps, laundry machines, web applications, computers, transportation and many others, all of which rely on software. Inevitably, this dependence raises the issue of software vulnerabilities and their possible impact on our lifestyle. Over the years, researchers and industrialists suggested several approaches to detect such issues and vulnerabilities. A particular popular branch of such approaches, usually called Vulnerability Prediction Modelling (VPM) techniques, leverage prediction modelling techniques that flag suspicious (likely vulnerable) code components. These techniques rely on source code features as indicators of vulnerabilities to build the prediction models. However, the emerging question is how effective such methods are and how they can be used in practice. The present dissertation studies vulnerability prediction models and evaluates them on real and reliable playground. To this end, it suggests a toolset that automatically collects real vulnerable code instances, from major open source systems, suitable for applying VPM. These code instances are then used to analyze, replicate, compare and develop new VPMs. Specifically, the dissertation has 3 main axes: The first regards the analysis of vulnerabilities. Indeed, to build VPMs accurately, numerous data are required. However, by their nature, vulnerabilities are scarce and the information about them is spread over different sources (NVD, Git, Bug Trackers). Thus, the suggested toolset (develops an automatic way to build a large dataset) enables the reliable and relevant analysis of VPMs. The second axis focuses on the empirical comparison and analysis of existing Vulnerability Prediction Models. It thus develops and replicates existing VPMs. To this end, the thesis introduces a framework that builds, analyse and compares existing prediction models (using the already proposed sets of features) using the dataset developed on the first axis. The third axis explores the use of cross-entropy (metric used by natural language processing) as a potential feature for developing new VPMs. Cross-entropy, usually referred to as the naturalness of code, is a recent approach that measures the repetitiveness of code (relying on statistical models). Using cross-entropy, the thesis investigates different ways of building and using VPMs. Overall, this thesis provides a fully-fledge study on Vulnerability Prediction Models aiming at assessing and improving their performance. [less ▲]

Detailed reference viewed: 18 (10 UL)
Full Text
Peer Reviewed
See detailThe Veneto Banks Resolution: It Shall Be Called ‘Liquidation’
Asimakopoulos, Ioannis UL

in European Company Law (2018), (5),

The establishment of Banking Union and the Single Resolution Mechanism has been arguably a success for the Eurozone. However, the enforcement of the new rules seems to meet significant challenges related ... [more ▼]

The establishment of Banking Union and the Single Resolution Mechanism has been arguably a success for the Eurozone. However, the enforcement of the new rules seems to meet significant challenges related to legacy problems that could make bank resolution economically and politically unfavourable for Member States. Italy and the two Veneto banks that were liquidated under national laws in June 2017 constitute such a case. However, this paper argues that this ‘orderly liquidation’ was, in essence, a hidden resolution, which raises logical legality concerns as to the actions ultimately taken by the European and national resolution authorities. The fact that public interest for resolution was not found by the Single Resolution Board, but was instead established by the Commission to provide liquidation aid on the grounds of 107(3)(b) TFEU, combined with the reasoning of the Commission’s decision do not seem to conform with the bank resolution and state aid rules currently in place. [less ▲]

Detailed reference viewed: 8 (0 UL)
See detailFür ein ‘anderes’ Verständnis von Grenze: Erfordernisse und Entwicklungen in den Border Studies. Einführungsvortrag
Wille, Christian UL

Presentation (2018, October)

Die Tagungsreihe zum Phänomen der Deplatzierung (2017-2019) fokussiert auf aktuelle Entwicklungen im Schnittfeld von Flucht, Grenze und Integration. Im Jahr 2018 stehen der Begriff der Grenze und seine ... [more ▼]

Die Tagungsreihe zum Phänomen der Deplatzierung (2017-2019) fokussiert auf aktuelle Entwicklungen im Schnittfeld von Flucht, Grenze und Integration. Im Jahr 2018 stehen der Begriff der Grenze und seine Bezüge zu Migrationsphänomenen im Zentrum. Dafür leitend ist das Verhältnis von Grenze und Flucht und vor diesem Hintergrund die Frage, wie Grenzen im Spiegel von aktuellen Entwicklungen gedacht werden können und müssen. Damit ist es Ziel der Tagung, das Konzept der Grenze sowie Migrationsphänomene in Verbindung zu bringen und ein zeitgemäßes Verständnis von ‚Grenze‘ zu entwickeln. Dafür leitend ist die Auffassung, dass Migration konstitutiv ist für Grenzen, die wiederum als Praktiken der Regulierung – und damit als Prozesse – gedacht werden und mit Phänomenen der Flucht in Beziehung stehen. Das bedeutet, ein ‚anderes’ Verständnis von Grenze muss es leisten, diese jenseits territorialer Markierungen zu denken und als Regulierungspraxis an unterschiedlichen Orten sichtbar zu machen. Dies führt zu der Frage, wo und wie sich Grenzen ‚ereignen‘ und zu der Einsicht, dass Grenze nicht resultieren aus dem vereinfacht gedachten Zusammenspiel von staatlicher Regulierungspraxis einerseits und migrancy andererseits. Vielmehr geht es darum, solche performativen Prozesse in ihrer Vielschichtigkeit in den analytischen Blick zu bekommen und kritisch zu untersuchen. Der Einführungsvortrag greift diese Erfordernisse auf und versucht theoretisch-konzeptuelle Antworten in den Border Studies zu finden. Dieses aufstrebende Arbeitsfeld der Sozial- und Kulturwissenschaften ist spätestens seit der Jahrtausendwende von einem Zuwachs der beteiligten Disziplinen, einer Gleichzeitigkeit der praktizierten Paradigmen und von einer fortschreitenden Binnendifferenzierung gekennzeichnet. Daran knüpft der Vortrag an und macht rezente Entwicklungen der kulturwissenschaftlichen Border Studies (Cultural Border Studies) für das Thema der Tagung produktiv. [less ▲]

Detailed reference viewed: 5 (2 UL)
Full Text
Peer Reviewed
See detailWhy Energy Matters? Profiling Energy Consumption of Mobile Crowdsensing Data Collection Frameworks
Tomasoni, Mattia; Capponi, Andrea UL; Fiandrino, Claudio et al

in Elsevier's Pervasive and Mobile Computing (PMC) journal (2018)

Mobile Crowdsensing (MCS) has emerged in the last years and has become one of the most prominent paradigms for urban sensing. The citizens actively participate in the sensing process by contributing data ... [more ▼]

Mobile Crowdsensing (MCS) has emerged in the last years and has become one of the most prominent paradigms for urban sensing. The citizens actively participate in the sensing process by contributing data with their mobile devices. To produce data, citizens sustain costs, i.e., the energy consumed for sensing and reporting operations. Hence, devising energy efficient data collection frameworks (DCF) is essential to foster participation. In this work, we investigate from an energy-perspective the performance of different DCFs. Our methodology is as follows: (i) we developed an Android application that implements the DCFs, (ii) we profiled the energy and network performance with a power monitor and Wireshark, (iii) we included the obtained traces into CrowdSenSim simulator for large-scale evaluations in city-wide scenarios such as Luxembourg, Turin and Washington DC. The amount of collected data, energy consumption and fairness are the performance indexes evaluated. The results unveil that DCFs with continuous data reporting are more energy-efficient and fair than DCFs with probabilistic reporting. The latter exhibit high variability of energy consumption, i.e., to produce the same amount of data, the associated energy cost of different users can vary significantly. [less ▲]

Detailed reference viewed: 53 (1 UL)
See detailAline Mayrisch an d'sozial Froen aus hirer Zäit
Santana, Dominique UL

Speeches/Talks (2018)

Detailed reference viewed: 3 (0 UL)
See detailDie Pilotphase eines hybriden Online-Sprach- und interkulturellen Kurses
Lejot, Eve UL; Molostoff, Leslie UL

Presentation (2018, September 21)

La phase pilote de la mise en place d’un cours en ligne d’apprentissage de langues est l’occasion de connaître l’appréciation des étudiants sur la réalisation de tâches en collaboration. Ces tâches sont ... [more ▼]

La phase pilote de la mise en place d’un cours en ligne d’apprentissage de langues est l’occasion de connaître l’appréciation des étudiants sur la réalisation de tâches en collaboration. Ces tâches sont scénarisées pédagogiquement par les centres de langues des six universités de la Grande Région (Luxembourg, Kaiserslautern, Liège, Lorraine, Sarre et Trèves) autour de la question de l’implication de futurs étudiants, candidats à une mobilité internationale, dans la collecte d’informations pour leur futur échange. L’objectif du projet est d’accompagner les étudiants, de les motiver à profiter de la chance d’avoir quatre pays dans un rayon de 200 km² et ainsi d’approfondir leurs compétences linguistiques et interculturelles. Lors de notre communication, nous allons faire un bilan sur les questionnaires remplis par les étudiants et les enseignants après la phase-pilote. Nous présenterons alors les modifications apportées à la plateforme avant son ouverture officielle. [less ▲]

Detailed reference viewed: 15 (4 UL)
Full Text
See detailLabour Market Integration of Third-Country Nationals in EU Member States
Petry, Ralph UL; Sommarribas, Adolfo UL; Nienaber, Birte UL

Report (2018)

Luxembourg is characterized by a very specific demographic situation with 47,9% of its resident population being non-Luxembourgish nationals as of 1 January 2018. This particular circumstance makes ... [more ▼]

Luxembourg is characterized by a very specific demographic situation with 47,9% of its resident population being non-Luxembourgish nationals as of 1 January 2018. This particular circumstance makes Luxembourg the EU Member State with the highest share of non-citizens residing on its territory. At the same time, around 85% of the foreign population are citizens of another EU Member State, leading to the fact that third-country nationals constitute only 7,3% of the total resident population of Luxembourg, the lowest share of foreigners coming from a third-country in the European Union. Integration is defined in national legislation as a ‘two-way process by which the foreigners shows their will to participate on a long-term basis to the host society, which, in turn, takes all the necessary measures at the social, economic, political, and cultural levels, to encourage and facilitate this approach. Integration is a task that the State, municipalities and civil society achieve together’. In addition to this legal provision, several strategic documents, most notably the multi-annual national action plan on integration 2018, or PAN integration, published in July 2018, make reference to integration and its definition. The PAN integration provides the framework for the programs and tools favouring the social cohesion of Luxembourgish and non-Luxembourgish nationals and the overall national integration policy by identifying five priority domains, one of which explicitly relates to the reinforcement of employability of non-Luxembourgish nationals. Generally speaking, employment is viewed as a core element of the overall integration process, making both the access to as well as the integration into the Luxembourgish labour market a key element in becoming a part of society. At the same time, this access to and integration into the labour market pose a challenge, particularly to third-country nationals, as the statistics show that their employment rate is lower than that of Luxembourgish nationals or citizens of another EU Member State. Third-country nationals are predominantly occupied in the accommodation and food service activities sector, followed by the administrative and support service activities sector and the wholesale and retail trade; repair of motor vehicles and motorcycles sector. A closer look at the evolution of the sectors employing third-country nationals over the last years, however, indicates that in particular the information and communication technologies sector, the professional, scientific and technical activities sector and the financial and insurance activities sector register the most significant growth rates, leading to a development that seem to indicate a ‘double immigration’ of (highly) skilled migrants on the one hand and less or low skilled migrants in the more traditional economic sectors on the other hand. In regard to the general integration approach as well as the labour market integration policy, this study shows that Luxembourg does have not have a specific policy/strategic document/model in place that only focusses on third-country nationals. All political documents (laws and strategic documents such as the PAN 2010-2014 and the new PAN integration of 2018) and public measures (Welcome and Integration Contract (CAI), linguistic leave, support measures provided by the National Employment Agency (ADEM), measures facilitating school integration, electoral registration campaigns, etc.) are aimed at all foreign nationals without distinguishing between EU nationals and third-country nationals. It is the Immigration Law that provides the legal framework regarding the various grounds of migration for economic purposes. Additionally, the legislator aims to be attractive for certain categories of migrants coming to Luxembourg for economic purposes in order to meet the needs of the country’s economic development (via legislative measures such as the European Blue Card, the ‘investor’ residence permit or the agreement between Luxembourg and Cape Verde). This being said, this study will present examples of practices that have been identified as good practices in the context of the topic of labour market integration of third-country nationals, despite the fact that they, for the most part, do not fit 100% into the pre-set structure of the study template at hand. In section 2.2, three Member State measure are presented, the first of which is the linguistic leave, a specific form of additional special leave that is accessible for salaried and independent workers of all nationalities, resident or non-resident, to learn or perfect the command of the Luxembourgish language. This legislative measure was introduced by law in 2009 with the intention to facilitate the integration of the beneficiaries into society through the labour market. The second measure is the AMIF-project ‘InSitu JOBS’ by the non-governmental organisation CLAE asbl (with co-financing from the Luxembourgish State). This project, which ended in April 2018 was targeted at third-country nationals within the scope of this study as well as at beneficiaries of international protection by providing them information and counselling in the context of access and integration into the Luxembourgish labour market. The third measure was also an AMIF-project and consists of a practical guide that was developed and drafted by IMS Luxembourg, a network of Luxembourgish companies, in order to provide information on how to hire and integrate third-country nationals. As for the private sector measures in section 2.3. of this study, research of secondary resources as well as consultations with various relevant stakeholders proved to be rather difficult in terms of finding private sector initiatives that specifically target at supporting or facilitating the labour market integration of third-country nationals within the scope of this study. Two measures were selected in this context, the first consisting of a specific recruitment method (simulation-based recruitment method) by a large international company which allows them to evaluate various different profiles of people that are not necessarily detectable through the classic CV-based recruitment methods. The second measure is a business guide developed by the American Chamber of Commerce Luxembourg and aims to promote and facilitate the establishment of new business in Luxembourg by providing information on everything that entrepreneurs and international companies need to know in this context. [less ▲]

Detailed reference viewed: 7 (2 UL)
Full Text
See detailTell Your Town – Sprache lernen, Integration fördern, Städte erkunden und entdecken
Reuter, Bob UL; Haberkorn, Marcus

Scientific Conference (2018, September 20)

Wie können ansässige und neu zugezogene Schülerinnen und Schülern in Rheinland-Pfalz und Luxemburg besser in ihren Regionen integriert werden, dabei ihre sprachlichen Fähigkeiten entwickeln und die ... [more ▼]

Wie können ansässige und neu zugezogene Schülerinnen und Schülern in Rheinland-Pfalz und Luxemburg besser in ihren Regionen integriert werden, dabei ihre sprachlichen Fähigkeiten entwickeln und die erforderliche Medienkompetenz erlernen? Diesen Fragen hat sich ein grenzüberschreitendes bilaterales Entwicklungs- und Forschungsprojekt gewidmet, wobei ein „Partizipativer Design“ Ansatz (Danielsson & Wiberg, 2006) angewandt wurde. Unter der Leitung eines Teams der Hochschule Trier wurde in Zusammenarbeit mit SchülerInnen und LehrerInnen der Escher Brill Schule und der Trierer Kurfürst-Balduin-Realschule sowie einem Team der Universität Luxemburg, während des Schuljahres 2016/2017, die mobile App „Tell Your Town" entwickelt. Ziel war es erfundene Geschichten an echten Schauplätzen in Trier und Esch auf Deutsch, Französisch, Englisch und Luxemburgisch in spielerischer Form zu erzählen. Die Geschichten, Schauplätze und Routen wurden in Design Workshops partizipativ erarbeitet. Ein Team an der Hochschule Trier setzte die App anschließend um und ein Team der Universität Luxemburg dokumentierte, analysierte und evaluierte die Benutzung der App durch die SchülerInnen in Feldversuchen in Trier und in Esch, mit Hilfe teilnehmender Beobachtungen, Videographie und Befragungen von SchülerInnen und LehrerInnen, um technische und pädagogische Rückmeldungen an die EntwicklerInnen und LehrerInnen zu geben. Bei diesem Projekt ist eine frei verfügbare App entstanden, welche die Benutzer dazu einlädt eine der beiden Städte „per pedes“ zu entdecken und dabei noch so einiges über die Geschichte der Stadt zu erfahren, was ihnen durch einen fiktionalen Reiseführer in interaktiven Dialogen vermittelt wird. Dabei wird die Geolokalisierungsfunktion des Smartphones genutzt um den Benutzer zu bedeutsamen Sehenswürdigkeiten zu führen, wo dann interaktive Minispiele oder Dialoge mit dem fiktionalen Reiseführer erfolgen. In der Route Esch steht die Geschichte des Luxemburgischen Bergbaus und den dortigen Minenarbeitern im Mittelpunkt. Die Route Trier handelt von einem Wettlauf zwischen Karl Marx und Nero. In diesem wird der Spieler von Karl Marx begleitet und lernt so bekannte Orte aus Trier kennen. Mit Hilfe der Feldversuche wurde sichtbar, dass die App großes Potential hat, um eine relativ autonome Erkundung der Städte zu initiieren und es auch den einheimischen SchülerInnen erlaubt, ihre Stadt mit neuen Augen bewusster wahrzunehmen. [less ▲]

Detailed reference viewed: 27 (1 UL)
Full Text
See detailA Dual-Grid Multiscale Approach to CFD-DEM Couplings for Multiphase Flow
Pozzetti, Gabriele UL

Doctoral thesis (2018)

This thesis focuses on a novel dual-grid multiscale approach to CFD- DEM1 couplings, proposes its advantages in terms of numerical proper- ties and performance, and provides examples of engineering ... [more ▼]

This thesis focuses on a novel dual-grid multiscale approach to CFD- DEM1 couplings, proposes its advantages in terms of numerical proper- ties and performance, and provides examples of engineering applications that can benefit from it. In recent years, CFD-DEM couplings are be- coming a more and more adopted solution for the numerical simulation of particle-laden flows. In particular, couplings based on the volume av- eraging technique have become a standard for numerical simulations in chemical and process engineering. Furthermore, they are rapidly spread- ing to civil, geotechnical and mechanical applications due to their ability in dealing with arbitrarily complex mixtures of continuum and granular media. Despite the several advantages that these Eulerian-Lagrangian cou- plings provide, their rigorous application to complex scenarios is currently limited by two main factors. First, the computational traceability of the solutions can become problematic due to the lack of a general theory on the subject. In particular, grid-convergence studies for the solution of the continuous phases are often not feasible due to the averaging procedure that imposes limitations on the grid structure and refinement. Second, the parallel implementation of these numerical schemes holds important disadvantages in terms of memory consumption and inter-physics com- munication load. These disadvantages are significantly limiting the ex- tension of these approaches to large-scale scenarios. This thesis collects some of the most significant works published in the last years on a novel approach that allows solving the two above- mentioned problems, and, therefore, tackling more complex and expen- sive scenarios. I refer to this approach as dual-grid multiscale approach for CFD-DEM couplings. It consists in using two different computational grids, one for the coupling between continuum and discrete entities and one for the solution of the so-obtained continuum equations. The two grids, i.e. the two problems, are in this way resolved on two different scales. The first scale or “bulk” scale is chosen to optimize the averag- ing operation. At this length-scale, the discrete entities are considered as zero-dimensional, and interact with the fluid with local exchanges of momentum, mass, and energy. The second scale or “fluid-fine” scale is identified as the one at which a unique solution for the averaged equa- tions can be provided. In practice, this is chosen as the one at which the solution of the fluid equations becomes grid-independent. An inter-scale communication is adopted by interpolating fields from the fluid-fine scale to the bulk one and vice-versa. The theoretical description of the method is first provided with par- ticular reference to the DEM-VOF coupling. Even in its simplest version, the multiscale approach is shown to generate grid-convergent solutions and significantly higher accuracy than a standard CFD-DEM coupling. This shows how the new approach is able to overcome the first main limitation described above. Then, an optimized parallel implementation of the method is pro- posed to show how this multiscale approach can provide significant ben- efits also for what concerns the execution time. Technically, this is made possible by moving the communication cost of the coupling from the inter-physics communication that characterized the standard CFD-DEM couplings to an optimized inter-scale communication routine. This en- ables the method to overcome a major bottleneck of the parallel execution of CFD-DEM couplings and therefore the second main limitation of those schemes. Finally, the dual-grid multiscale method is applied to approach in- dustrially relevant problems that were till now out-of-reach for standard CFD-DEM couplings, proving how this technique can have direct real- case application and produce immediate benefits for practitioners willing to adopt it. [less ▲]

Detailed reference viewed: 14 (6 UL)
Peer Reviewed
See detailUsing Log-File Data to Uncover Strategy Use in Complex Problem Solving
Nicolay, Björn Fabrice UL; Krieger, Florian UL; Lagou, Charalampia UL et al

Scientific Conference (2018, September 18)

The aim of the current project is to utilize log-file data to enhance the understanding of strategy use in Complex Problem Solving (CPS). CPS can be defined as the ability to manipulate the existing ... [more ▼]

The aim of the current project is to utilize log-file data to enhance the understanding of strategy use in Complex Problem Solving (CPS). CPS can be defined as the ability to manipulate the existing variables of a particular novel, complex, intransparent, and dynamic environment successfully in order to reach a predefined goal. In order to successfully solve a CPS task, the goal-directed application and variation of certain strategies is necessary. To uncover the systematic use of these strategies, log-files have been deemed a fruitful resource as they contain not only the final results of a computer-based CPS item, but also the individual steps undertaken while solving such a task. Recent studies using log-files have highlighted the importance of some strategies for CPS, like the varying one variable at a time (VOTAT) strategy, or of engaging in noninterfering observations (i.e., idle rounds). In addition, other strategies have also been shown to be relevant in neighboring fields of CPS. However, comprehensive studies investigating a broad repertoire of strategies applied in CPS are scarce. Hence, on the basis of existing large-scale assessment data sets, the present project set out to investigate which strategies hidden in log-files are relevant for solving a CPS task in order to gain a more thorough understanding of how CPS tasks are being approached. Preliminary findings indicate that, in addition to VOTAT and idle rounds, particularly the flexibility of switching between strategies should be taken into account. [less ▲]

Detailed reference viewed: 12 (3 UL)
Full Text
See detailMobile, Playful and Collaborative Learning with TellYourTown: Empirical Results from Field Studies in Trier and Esch
Reuter, Bob UL

Conference given outside the academic context (2018)

In the context of the transnational development and research project "Language Learning - Promoting Integration", a mobile app (TellYourTown) was developed together with school classes of the Kurfürst ... [more ▼]

In the context of the transnational development and research project "Language Learning - Promoting Integration", a mobile app (TellYourTown) was developed together with school classes of the Kurfürst-Balduin-Realschule (Trier, Germany) and the Brill Schule (Esch-sur-Alzette, Luxembourg), which tells fictional stories at real locations in Trier and Esch. The stories were developed during the 2016/2017 school year in collaboration with the students and their teachers. These stories were then used as a basis for the development of the routes. The Esch route focuses on the history of Luxembourg's mining industry and its miners. The route Trier is about a race between Karl-Marx and Nero through Trier. In this game, the player is accompanied by Karl-Marx and thus gets to know well-known places from Trier. The users should discover the city "per pedes" and at the same time learn a lot about the history of the city, which is conveyed to them by the fictional travel guide in the interactive dialogues. The geolocation function of the smartphone is used to guide the users to places of interest, where interactive mini-games or dialogues with the fictional travel guide take place. To thoroughly test the app in practice, two field trials were organised, one in Trier and one in Esch. These field trials were documented by researchers from the University of Luxembourg and were scientifically analysed with regard to the social interactions and learning processes that took place. Based on this analysis, suggestions for improvement were made to the developers and possible scenarios for a meaningful use of the app in pedagogical contexts were developed. During the first field trial certain technical issues were identified. Observational data showed that the app has great potential to initiate a relatively autonomous exploration of both cities and also allowed the local students to perceive their city more consciously with new eyes. But there were also certain limitations as to the learning, social and motivational effects that the use of the app had. We will try to address these in future iterations of the app. [less ▲]

Detailed reference viewed: 6 (4 UL)
Full Text
Peer Reviewed
See detailSingle-cell transcriptomics reveals distinct inflammation-induced microglia signatures
Sousa, Carole UL; Golebiewska, Anna; Poovathingal, Suresh K et al

in EMBO Reports (2018)

Microglia are specialized parenchymal‐resident phagocytes of the central nervous system (CNS) that actively support, defend and modulate the neural environment. Dysfunctional microglial responses are ... [more ▼]

Microglia are specialized parenchymal‐resident phagocytes of the central nervous system (CNS) that actively support, defend and modulate the neural environment. Dysfunctional microglial responses are thought to worsen CNS diseases; nevertheless, their impact during neuroinflammatory processes remains largely obscure. Here, using a combination of single‐cell RNA sequencing and multicolour flow cytometry, we comprehensively profile microglia in the brain of lipopolysaccharide (LPS)‐injected mice. By excluding the contribution of other immune CNS‐resident and peripheral cells, we show that microglia isolated from LPS‐injected mice display a global downregulation of their homeostatic signature together with an upregulation of inflammatory genes. Notably, we identify distinct microglial activated profiles under inflammatory conditions, which greatly differ from neurodegenerative disease‐associated profiles. These results provide insights into microglial heterogeneity and establish a resource for the identification of specific phenotypes in CNS disorders, such as neuroinflammatory and neurodegenerative diseases. [less ▲]

Detailed reference viewed: 12 (1 UL)