References of "Scientific congresses, symposiums and conference proceedings"
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See detailTopologie culinaire au cinéma : le lieu commun du repas et ses déclinaison
Roelens, Nathalie UL

in Bibliothèque électronique Paris 8 (in press)

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See detailConservazione e ricezione dei documenti pontifici in Italia settentrionale: il caso del monastero cistercense di Chiaravalle Milanese (secoli XII-XVI)
Salemme, Timothy UL

in Salemme, Timothy; Renault, Jean-Baptiste (Eds.) Conservation et réception des documents pontificaux par les Ordres religieux (XIe-XVe siècles). Actes du colloque international. Nancy, 12-13 décembre 2013 (in press)

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See detailHistorical outline and chromatic properties of purpura rubra Tarentina and its potential identification with purple dye extracted from Bolinus brandaris
Meiers, Fabienne UL

in Enegren, Hedvig; Meo, Francesco (Eds.) Treasures from the Sea : Sea-Silk and Shell purple dye in antiquity. Proceedings from the International workshop, 26.-28.05. (in press)

This paper presents a historical overview of the importance of the red dye found in spiny dye-murices (Bolinus brandaris) and its production in Taranto, one of the most industrious Greek colonies founded ... [more ▼]

This paper presents a historical overview of the importance of the red dye found in spiny dye-murices (Bolinus brandaris) and its production in Taranto, one of the most industrious Greek colonies founded in southern Italy in the 8th century BC and renowned for its luxury products. Written evidence as well as numismatic and archaeological sources dating from the 5th century BC to the 5th century AD have been analysed in this context to identify purpura rubra Tarentina. In addition, the results of a series of dye experiments with hypobranchial glands from the same species are treated in order to detect chromatic properties and potential manufacturing processes for Tarentine Red. The methods for vatting the dye glands are discussed in relation to historical validity and chromatic outcome. To conclude, comparisons are drawn between the colour characteristics of Bolinus brandaris and Hexaplex trunculus (banded dye-murex), and the possibility of mixing both dyes is taken into consideration. The synthesis of historical and experimental approach finally shows that purpura rubra Tarentina can potentially be identified with purple dye extracted from Bolinus brandaris. [less ▲]

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See detailLe dialogue entre les juges en matière de protection des droits de l'homme
Pelin Raducu, Ioana UL

in Menetrey, Séverine; Hess, Burkhard (Eds.) Les dialogues des juges en Europe (in press)

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard ... [more ▼]

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard propre de l’UE en matière des droits de l’homme. Cette tendance de la C.J.U.E. contredira le prescrit normatif découlant du « dialogue des juges » d’interprétation conforme à la jurisprudence de la C.E.D.H. avant que l’adhésion de l’UE à la Convention E.D.H. ne soit formellement acquise. [less ▲]

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See detailBuffer XDEM
Mainassara Chekaraou, Abdoul Wahid UL; Besseron, Xavier UL; Rousset, Alban UL et al

Scientific Conference (in press)

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See detailDatenbank für Zweisprachige Historische Luxemburgische Bekanntmachungen
Gilles, Peter UL; Ziegler, Evelyn

in Wallmeier, Nadine; Tophinke, Doris (Eds.) Historische Stadtsprachenforschung (in press)

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See detailLe quotidien d’un poilu de la première guerre mondiale sur Facebook : nouvelle forme de médiation, nouvelle expérience ?
Schall, Céline UL; Vilatte, Jean-Christophe

in Les mondes de la médiation culturelle (in press)

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une ... [more ▼]

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une forme de médiation a priori inédite pour un musée français. Elle présente l’histoire d’un personnage de fiction, Léon Vivien, qui raconte son quotidien lors de la première guerre mondiale, sur Facebook, comme si ce réseau social avait existé à cette époque. Cette contribution met en évidence certains des effets de sens de la page par une analyse sémiotique du dispositif et une analyse thématique de ses contenus. Nous questionnons ensuite cette « nouvelle » forme de médiation qui se dit « participante » et qui, en réalité, reste assez classique dans son contenu et sous-exploite le potentiel de Facebook. » [less ▲]

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See detailA New Perspective on the Luxembourgish Genitive
Döhmer, Caroline UL

in Germanic Genitives (in press)

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See detailL’exposition d’objets ou de collections de « marque » : cobranding, réécriture, réénonciation
Schall, Céline UL

in Laval, Sylvie (Ed.) Marques muséales : un espace public revisité ? (in press)

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités  ... [more ▼]

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités ? Quels effets peut avoir cette démarche sur la communication ou sur l’exposition ? Notamment, le musée d’accueil s’approprie-t-il simplement l’imaginaire et les valeurs de la marque invitée par un phénomène de « transfert » ? Pour répondre à ces questions, nous étudions trois expositions qui reprennent des objets ou collections de musées dont la marque est internationalement reconnue. L’analyse sémiotique des images de marque du musée d’accueil et du musée invité ainsi que l’analyse sémiopragmatique des expositions montrent l’impact de la présence d’une grande marque internationale sur l’exposition et réciproquement, l’impact de l’exposition sur l’image de marque du musée d’accueil. Plus qu’un simple cobranding, c’est une réécriture impliquant une réénonciation du discours et des valeurs portés par les marques qui est proposée à travers ces expositions. Le processus aboutit à la création de nouveaux espaces symboliques et d’expositions réflexives, avec plusieurs niveaux de lecture. [less ▲]

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See detailExternalisation de la politique migratoire et identité de l'Union européenne
Neframi, Eleftheria UL; Gatti, Mauro UL

in Benlolo, Myriam (Ed.) L'Union européenne et les migrations (in press)

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See detailLa Charte dans l'action extérieure de l'Union européenne
Neframi, Eleftheria UL

in Iliopoulou Penot, Anastasia; Xenou, Lamprini (Eds.) La Charte des droits fondamentaux de l'UE (in press)

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See detailLes archevêques de Milan face aux premières expériences seigneuriales: stratégies et positionnements (milieu XIIIe-début XIVe s.)
Salemme, Timothy UL

in Barralis, Christine (Ed.) L’évêque face à son métier. Actes du colloque international, Metz. 15-17 novembre 2017 (in press)

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See detailHybrid Analog-Digital Precoding Design for Satellite Systems
Arora, Aakash UL; Tsinos, Christos UL; Shankar, Bhavani UL et al

in Proc. 37th International Communications Satellite Systems Conference (ICSSC'19) (in press)

The work investigates the feasibility of massive MIMO in SatCom. Towards this, the necessary channel models, system parameters and scenarios are identified and a basic simulator developed. The work then ... [more ▼]

The work investigates the feasibility of massive MIMO in SatCom. Towards this, the necessary channel models, system parameters and scenarios are identified and a basic simulator developed. The work then considers an efficient implementation of the massive MIMO transmission through the use of hybrid analog/digital precoder. Efficient algorithmic solutions are proposed for the partially connected precoder architecture which enables efficiency in power/ hardware complexity and its performance evaluated. [less ▲]

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See detail« … Eripuit servus mihi vitam » - Représentations médiatiques de la violence et de la criminalité dans les provinces occidentales de l'Empire romain
Binsfeld, Andrea UL

in Amodio, Mara (Ed.) The imagery of violence in Roman society (I-VI cent.). Persistence, innovations and interrelations from the Roman to the Christian Empire (in press)

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See detailA Methodology for Handling Data Movements by Anticipation: Position Paper
Bleuse, Raphaël UL; Lucarelli, Giorgio; Trystram, Denis

in Euro-Par 2018 Workshops (in press)

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on ... [more ▼]

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on different nodes of the system. The management of such a huge communication demand is crucial for reaching the best possible performance of the system. Meanwhile, we have to deal with more interferences as the trend is to use a single all-purpose interconnection network whatever the interconnect (tree-based hierarchies or topology-based heterarchies). There are two different types of communications, namely, the flows induced by data exchanges during the computations, and the flows related to Input/Output operations. We propose in this paper a general model for interference-aware scheduling, where explicit communications are replaced by external topological constraints. Specifically, the interferences of both communication types are reduced by adding geometric constraints on the allocation of tasks into machines. The proposed constraints reduce implicitly the data movements by restricting the set of possible allocations for each task. This methodology has been proved to be efficient in a recent study for a restricted interconnection network (a line/ring of processors which is an intermediate between a tree and higher dimensions grids/torus). The obtained results illustrated well the difficulty of the problem even on simple topologies, but also provided a pragmatic greedy solution, which was assessed to be efficient by simulations. We are currently extending this solution for more complex topologies. This work is a position paper which describes the methodology, it does not focus on the solving part. [less ▲]

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See detailUsing Passive Data Collection Methods to Learn Complex Mobility Patterns: An Exploratory Analysis
Toader, Bogdan UL; Cantelmo, Guido UL; Popescu, Mioara et al

Scientific Conference (in press)

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See detailDon't Trust Me, Test Me: 100% Code Coverage for a 3rd-party Android App
Pilgun, Aleksandr UL

in Pilgun, Aleksandr (Ed.) Don't Trust Me, Test Me: 100% Code Coverage for a 3rd-party Android App (in press)

The incompleteness of 3rd-party app testing is an accepted fact in Software Engineering. This issue makes it impossible to verify the app functionality and to confirm its safety to the end-user. To solve ... [more ▼]

The incompleteness of 3rd-party app testing is an accepted fact in Software Engineering. This issue makes it impossible to verify the app functionality and to confirm its safety to the end-user. To solve this problem, enterprises developed strict policies. A company, willing to use modern apps, may perform an expensive security analysis, rely on trust or forbid the app. These strategies may lead companies to high direct and indirect spending with no guarantee of safety. In this work, we present a novel approach, called Dynamic Binary Shrinking, that allows a user to review app functionality and leave only tested code. The shrunk app produces 100% instruction coverage on observed behaviors and in this way guarantees the absence of unexplored, and therefore, potentially malicious code. On our running examples, we demonstrate that apps use less than 20% of the codebase. We developed an approach and the ACVCut tool to shrink Android apps towards the executed code. Repository — http://github.com/pilgun/acvcut. [less ▲]

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See detailWidths of regular and context-free languages
Mestel, David UL

in 39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019) (in press)

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See detailProcess analysis in thermal process engineering with high-performance computing using the example of grate firing
Peters, Bernhard UL; Rousset, Alban UL; Besseron, Xavier UL et al

in 12th European Conference on Industrial Furnaces and Boilers (in press)

Biomass as a renewable energy source continues to grow in popularity to reduce fossil fuel consumption for environmental and economic benefits. In the present contribution, the combustion chamber of a 16 ... [more ▼]

Biomass as a renewable energy source continues to grow in popularity to reduce fossil fuel consumption for environmental and economic benefits. In the present contribution, the combustion chamber of a 16 MW geothermal steam super-heater, which is part of the Enel Green Power "Cornia 2" power plant, is being investigated with high-performance computing methods. For this purpose, the extended discrete element method (XDEM) developed at the University of Luxembourg is used in a high-performance computing environment, which includes both the moving wooden bed and the combustion chamber above it. The XDEM simulation platform is based on a hybrid four-way coupling between the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD). In this approach, particles are treated as discrete elements that are coupled by heat, mass, and momentum transfer to the surrounding gas as a continuous phase. For individual wood particles, besides the equations of motion, the differential conservation equations for mass, heat, and momentum are solved, which describe the thermodynamic state during thermal conversion. The consistency of the numerical results with the actual system performance is discussed in this paper to determine the potentials and limitations of the approach. [less ▲]

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See detailBlockchain Governance: An Overview and Prediction of Optimal Strategies Using Nash Equilibrium
Khan, Nida UL; Ahmad, Tabrez; Patel, Anass et al

in 3rd AUE International Research Conference (in press)

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this ... [more ▼]

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this nascent technology. In this paper, the position of blockchain governance within the hierarchy of Institutional governance is discussed. Blockchain governance is analyzed from the perspective of IT governance using Nash equilibrium to predict the outcome of different governance decisions. A payoff matrix for blockchain governance is created and simulation of different strategy profiles is accomplished for computation of all Nash equilibria. We also create payoff matrices for different kinds of blockchain governance, which were used to propose novel mathematical formulae usable to predict the best governance strategy that minimizes the occurrence of a hard fork as well as predicts the behavior of the majority during protocol updates. [less ▲]

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See detailFlipping Geometric Triangulations on Hyperbolic Surfaces
Despré, vincent; Schlenker, Jean-Marc UL; Teillaud, Monique

in symposium on computational geometry (SoCG) (in press)

We consider geometric triangulations of surfaces, i.e., triangulations whose edges can be realized by disjoint locally geodesic segments. We prove that the flip graph of geometric triangulations with ... [more ▼]

We consider geometric triangulations of surfaces, i.e., triangulations whose edges can be realized by disjoint locally geodesic segments. We prove that the flip graph of geometric triangulations with fixed vertices of a flat torus or a closed hyperbolic surface is connected. We give upper bounds on the number of edge flips that are necessary to transform any geometric triangulation on such a surface into a Delaunay triangulation. [less ▲]

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See detailWhich Properties has an Icon? A Critical Discussion on Evaluation Methods for Standardised Data Protection Iconography
Rossi, Arianna UL; Lenzini, Gabriele UL

in Proceedings of the 8th Workshop on Socio-Technical Aspects in Security and Trust (STAST) (in press)

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this ... [more ▼]

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this paper, we firstly critically review some of those proposals. We then examine the properties that icons and icon sets should arguably fulfill according to Art.12's transparency provisions. Lastly, we discuss metrics and evaluation procedures to measure compliance with the Article. [less ▲]

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See detailThe legacy of coal mining – a view on examples in Belgium and France
Helfer, Malte UL

in Deutsches Bergbau-Museum Bochum (Ed.) Boom – Crisis – Heritage. King Coal and Energy Revolutions after 1945; proceedings of the international conference March 14th-16th 2018, Technische Hochschule Georg Agricola, Bochum (in press)

Following the end of coalmining in Belgium (1992) and France (2004), the year 2018 marks the end of hard coal mining in Germany as well. This contribution looks at the legacy of coalmining of Germany’s ... [more ▼]

Following the end of coalmining in Belgium (1992) and France (2004), the year 2018 marks the end of hard coal mining in Germany as well. This contribution looks at the legacy of coalmining of Germany’s French-speaking neighbours and presents the most important remaining coal mining heritage sites as well as some extraordinary converted sites in France and the Belgian province Wallonia. [less ▲]

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See detailGoal-Directed Decision Procedures for Input/Output Logics
Steen, Alexander UL

in Marra, Alessandra; Liu, Fenrong; Portner, Paul (Eds.) et al Deontic Logic and Normative Systems: 15th International Conference (DEON2020/2021, Munich) (in press)

Input/Output (I/O) logics address the abstract study of conditional norms. Here, norms are represented as pairs of formulas instead of statements that themselves carry truth-values. I/O logics have been ... [more ▼]

Input/Output (I/O) logics address the abstract study of conditional norms. Here, norms are represented as pairs of formulas instead of statements that themselves carry truth-values. I/O logics have been studied thoroughly in the past, including further applications and refinements. In this paper, a class of automated reasoning procedures is presented that, given a set of norms and a concrete situation, decide whether a specific state of affairs is obligatory according to the output operations of I/O logics. The procedures are parametric in the underlying logical formalism and can be instantiated with different classical objects logics, such as propositional logic or first-order logic. The procedures are shown to be correct, and a proof-of-concept implementation for propositional I/O logics is surveyed. [less ▲]

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See detailUpdate Internationales und Europäisches Steuerrecht
Sinnig, Julia UL

in Taeger, Jürgen (Ed.) Tagungsband DSRI-Herbstakademie 2020 (in press)

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle ... [more ▼]

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle, der in einer Veröffentlichung im Januar 2020 vorgestellt wurde. Auf Ebene der Europäischen Union gab es im Berichtszeitraum keine Weiterent-wicklung der Richtlinienvorschläge zu einer Digitalsteuer und dem Konzept der „signifi-kanten digitalen Präsenz“. Der EuGH urteilte am 3. März 2020 in Hinblick auf die unions-rechtliche Vereinbarkeit zweier ungarischer Umsatzsteuern. Dieses Urteil erlaubt erste Rückschlüsse bezüglich der Europarechtskonformität umsatzbasierter Steuern, wie bspw. auch im Berichtszeitraum eingeführte Digitalsteuern einzelner Mitgliedstaaten. Dieser Beitrag knüpft an die Vorträge von Prof. Dr. Jens M. Schmittmann und der Verfasserin anlässlich der Herbstakademien 2018 in Bochum und 2019 in Oldenburg, sowie dem Vortrag der Verfasserin anlässlich der Herbstakademie 2017 in Heidelberg an. [less ▲]

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See detailMeasuring multicultural ideology: Scale development and validation in different languages and contexts
Stogianni, Maria UL; Schmidt, Lea Marie; Murdock, Elke UL et al

Scientific Conference (2021, July)

Increased migration has led to the formation of culturally diverse societies in many places around the world. The concept of Multicultural Ideology incorporates two values as a way to promote positive ... [more ▼]

Increased migration has led to the formation of culturally diverse societies in many places around the world. The concept of Multicultural Ideology incorporates two values as a way to promote positive intercultural relations: a) Diversity: the presence of ethnocultural diversity in the population and b) Equity: the right for equal participation of all cultural groups in the society. Both diversity and equity are necessary conditions for the success of multicultural policies. Culturally heterogeneous communities that do not support inclusion and equitable participation of all groups face the negative consequences of segregation and marginalization. In line with this notion, an international research consortium is developing a revised version of the Multicultural Ideology Scale to assess the endorsement of multicultural ideology in different national contexts. The scale aims to distinguish various attitudinal dimensions of multiculturalism, relevant to the acceptance of diversity and social inclusion of different ethnocultural groups: Cultural Maintenance, Social Interaction, Equity/Inclusion, Extent of Differences, Conflictual Relations, Essentialistic Boundaries. We present the first assessment of the new scale in the German language. The survey was administered online to a sample of native German citizens (N = 382) with different demographic characteristics. Our aim was to understand the attitude of native citizens towards cultural diversity and their willingness to have members of ethnic minority groups be included in the larger society. We investigated the factor structure of the scale, its psychometric properties, and the relationship between multicultural ideology and some individual difference variables, such as ethnic group attachment and social dominance orientation. [less ▲]

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See detailSmall in size, great in significance: conspicilla and perspicilla in the visual arts of the Low Countries around 1600
Koeleman, Floor UL

Scientific Conference (2021, July)

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée ... [more ▼]

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée Magnin (Dijon) seems to allude to the implicit link between the two. As tools to observe with and through, these instruments visualize the limits of human perception and the ability to alter the scale of the visible world. The Five Senses was created in Antwerp around the same time the telescope first appeared in textual sources, namely 1608. However, the optical instrument is likely to have existed for years by then. This paper investigates if any references to the telescope in the visual arts predate the first written evidence of its invention. For artists the early telescope was probably not that challenging an object to represent. The exterior, a simple tube characterized by a diaphragm, housed two lenses made by the same glass industry that manufactured eyeglasses. This paper takes a closer look at the imagery of eyeglasses and telescopes, depicted in the visual arts of the late sixteenth and early seventeenth centuries. The meaning assigned to these instruments can be inferred from the context in which they are presented and their relative scale. Together eyeglasses and telescopes feature prominently in constcamer paintings dedicated to visual perception, understood both physically and metaphysically. While the exact date of creation remains subject to debate, The Five Senses probably contains the earliest known depiction of a telescope – true to scale. [less ▲]

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See detailVertex Feature Encoding and Hierarchical Temporal Modeling in a Spatio-Temporal Graph Convolutional Network for Action Recognition
Papadopoulos, Konstantinos UL; Ghorbel, Enjie UL; Aouada, Djamila UL et al

in International Conference on Pattern Recognition, Milan 10-15 January 2021 (2021, January)

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See detailKant's supposed realism about things-in-themselves
Heidemann, Dietmar UL

in Serck-Hanssen, Camila (Ed.) Proceedings of the 13th International Kant Congress ‘The Court of Reason’ (Oslo, 6-9 August 2019) (2021)

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See detailConcise UC Zero-Knowledge Proofs for Oblivious Updatable Databases
Camenisch, Jan; Dubovitskaya, Maria; Rial, Alfredo UL

in 2021 34th IEEE Computer Security Foundations Symposium (2021)

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See detailMultipath Mitigation Maps feasibility and applicability as an International GNSS Service product
Hunegnaw, Addisu UL; Teferle, Felix Norman UL; Elgered, Gunnar et al

Scientific Conference (2020, December 17)

There have been many advances in the modeling of Global Navigation Satellite System (GNSS) observables when estimating position and other parameters of interest. Some of these bias models are related to ... [more ▼]

There have been many advances in the modeling of Global Navigation Satellite System (GNSS) observables when estimating position and other parameters of interest. Some of these bias models are related to improvements of reference frames, phase center offsets and variations of transmitter and receiver antennas, satellite orbits and clocks, and troposphere. Nonetheless, multipath remains for the most part an unmodelled source of error which causes range errors in the GNSS observations. The associated effects show highly localized features and have a different impact for each receiver and antenna. Multipath errors can propagate, can cause in-situ position biases and are also contributing to the prevalent draconitic harmonic signals. In order to mitigate the problem we generate site-specific corrections by employing a suitable averaging scheme for the stacking of carrier phase residuals. Our processing is based on globally distributed static multi-GNSS observations using several scientific GNSS software packages (Bernese GNSS Software, NAPEOS, GAMIT-GLOBK, and CSRS-PPP). Our multipath stacking maps (MPS) use the stacking of carrier phase residuals generated by variable azimuth cell size (congruent cells) and by allocating carrier phase residuals in each cell to generate the correction maps, unlike the standard fixed azimuth cell resolution approaches. This reduces the binning of fewer residuals at higher elevation angles. Before stacking, we also apply rigorous statistical outlier screening tests for each one-way post-fit carrier phase residual assigned to each of the congruent cells. We thus correct the multipath effects by subtracting the stacked multipath map from the post-fit carrier phase residual. Using this technique we produce a model available in the form of the Antenna Exchange (ANTEX) file format, that can potentially be implemented in routine GNSS analysis with no or little additional overhead for individual analysis centers (ACs). In this study, we assess the feasibility and applicability of the MPS maps as an International GNSS Service (IGS) product for routine GNSS analysis. We demonstrate the multipath stacking technique to result in a significant reduction of the variation in the one-way post-fit carrier phase residuals from multi-GNSS observations. [less ▲]

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See detailVertical Land Movements and Sea Level Changes on South Georgia, South Atlantic Ocean: Results from 7 Years of Geodetic and Oceanographic Observations on a Remote Island
Teferle, Felix Norman UL; Hunegnaw, Addisu UL; Hibbert, Angela et al

Scientific Conference (2020, December 16)

South Georgia Island in the South Atlantic Ocean, is a small remote land mass that supports various ground-based instrumental observations (Global Navigation Satellite System (GNSS), tide gauge ... [more ▼]

South Georgia Island in the South Atlantic Ocean, is a small remote land mass that supports various ground-based instrumental observations (Global Navigation Satellite System (GNSS), tide gauge, meteorological and seismic) in an otherwise largely under sampled oceanic region. Moreover, the South Atlantic Ocean plays an important role in global ocean circulation, con-necting the deep thermohaline circulation of the North Atlantic and Indian Oceans, whilst also linking to the Antarctic Circumpolar Current in the South, where the lack of continental barriers allows a free exchange of water between the major ocean basins. Hence, South Georgia po-tentially lies within a region susceptible to climatic changes before these can be felt further afield. In 2013 and 2014 a total of five GNSS stations were installed covering the area of the main island (approximately 170 x 50 km) with two of those being located close to the King Edward Point (KEP) Research Station and the GLOSS tide gauge (ID 187). Furthermore, precise levelling campaigns in 2013, 2014, 2017 and 2020 supported the analysis of local ground instabilities near the tide gauge. Through these activities the tide gauge datum within the Permanent Ser-vice for Mean Sea Level (PSMSL) has been established, which in turn, makes the derived KEP mean sea level (MSL) record highly valuable for long-term studies and satellite altimetry cali-brations. In this study, we will present the vertical land movement estimates from seven years of GNSS observations, five precise levelling campaigns, and will discuss their impact on the sea level record from the KEP tide gauge and nearby satellite altimetry sea surface heights. Our results confirm uplift all over South Georgia Island while the area at KEP and particularly the jetty with tide gauge are subsiding relative to the rest of the island. Using this information we correct the MSL record for the vertical land movements and investigate its signals together with those from nearby satellite altimetry tracks. [less ▲]

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See detailTest
Erkihune, Eshetu Nega UL; Teferle, Felix Norman UL; Hunegnaw, Addisu UL et al

Poster (2020, December 11)

test

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See detailOut-of-the-box Multipath TCP as a Tor Transport Protocol: Performance and Privacy Implications
de La Cadena Ramos, Augusto Wladimir UL; Kaiser, Daniel UL; Panchenko, Andriy UL et al

in 19th IEEE International Symposium on Network Computing and Applications (IEEE NCA 2020) (2020, November 25)

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See detailThe Helpers of Anne Frank - Recontextualising the Rescue of Dutch Jews
Zaagsma, Gerben UL

Scientific Conference (2020, November 24)

This paper sets out to recontextualise the memory of rescue as it pertains to Dutch Jewry during the Holocaust, by focusing on the helpers of Anne Frank and the other Jews in hiding in the Secret Annex ... [more ▼]

This paper sets out to recontextualise the memory of rescue as it pertains to Dutch Jewry during the Holocaust, by focusing on the helpers of Anne Frank and the other Jews in hiding in the Secret Annex. Much in the same way as perceptions of Jews in hiding have been decisively shaped by the story of Anne Frank, not only in the Dutch public imagination but arguably globally, so too the image of help, at least in the Western European and Anglosaxon world, has been considerably shaped by the story of two of the five helpers, Miep and Jan Gies, even if the support they provided to the onderduikers in the Secret Annex could ultimately not prevent discovery. The question of help, as well as the ultimate betrayal, of the onderduikers are linked to the broader question of the role of the Dutch population during the Holocaust. Within that context the Anne Frank story can and has indeed been used to provide both a stereotypical image of Gentile betrayal as well as an idealized and, arguably, romanticized image of Gentile help. In this paper I will trace the ways in which the image of help and rescue of Dutch Jews was shaped by the story of, especially, Miep Gies and analyse the ways in which her story resonated in the Netherlands as well as abroad. Important moments in this regard were the recognition of Miep Gies and the other helpers as Righteous Among the Nations in 1972, and the global publication of Miep Gies’ memoirs in 1987. I will frame this analysis within the broader historical context of 1) help provided to Jews in hiding in the Netherlands and the question of how representative the ‘helpers of Anne Frank’ were, and 2) the extent to which a focus on a few key individuals obscures the more complex reality of how rescue functioned in the first place. [less ▲]

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See detailUpdate on NORMAN-SLE / SusDat for NORMAN-CWG-NTS Meeting (17 Nov 2020)
Schymanski, Emma UL

Scientific Conference (2020, November 17)

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See detailMultilingual education in early years in Luxembourg: mind ideologies!
Kirsch, Claudine UL

Scientific Conference (2020, November 14)

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See detailTrafficSliver: Fighting Website Fingerprinting Attacks with Traffic Splitting
de La Cadena Ramos, Augusto Wladimir UL; Mitseva, Asya; Hiller, Jens et al

in 27th ACM Conference on Computer and Communications Security (CCS '20) (2020, November 13)

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See detailProfessional development to promote innovative language teaching: examples from multilingual Luxembourg
Kirsch, Claudine UL

Scientific Conference (2020, November 13)

While multilingual programmes have been implemented in early childhood education in several countries in Europe, professionals may still be unsure of how to promote multilingualism and deal with language ... [more ▼]

While multilingual programmes have been implemented in early childhood education in several countries in Europe, professionals may still be unsure of how to promote multilingualism and deal with language diversity. There is a need for professional development (PD) which can influence the practitioners’ attitudes, knowledge and skills, and the quality of their teaching (Egert et al., 2018; Peleman et al., 2017). This presentation begins with an outline of several theoretical models of PD and explains why integrated models that are collaborative, inquiry-based, and performance-based are the most effective in contributing to change. I will then present a PD used in Luxembourg to help early childhood practitioners develop and implement multilingual pedagogies. The model, which comprised training sessions, network meetings, and coaching, aimed to deepen the practitioners’ understanding of multilingualism and language learning, familiarize them with translanguaging (García & Reid, 2019) and enable them to implement language and literacy activities in Luxembourgish, French and children’s home languages (Kirsch et al. forthcoming). Finally, I provide insights into the professional learning of two preschool teachers. The PD, the experience of engaging in multilingual activities, and the reflection on teaching and learning, enabled the teachers to develop a positive stance to multilingual education, design productive leaning environments based on social-constructivist theories, and monitor language use to guarantee responsible translanguaging (Kirsch 2020). [less ▲]

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See detailFormation à la pratique d’enseignement en temps de crise sanitaire: Conception, production et diffusion de vidéos pédagogiques à distance
Reuter, Robert UL; Reeff, Alain; Busana, Gilbert UL

Scientific Conference (2020, November 13)

Le Bachelor en Sciences de l’Education (BScE) de l’Université du Luxembourg propose une formation approfondie et exigeante alliant savoir académique et pratique. Ils sont formés pour enseigner dans tous ... [more ▼]

Le Bachelor en Sciences de l’Education (BScE) de l’Université du Luxembourg propose une formation approfondie et exigeante alliant savoir académique et pratique. Ils sont formés pour enseigner dans tous les cycles de l’école fondamentale, dans les classes de la voie de préparation et dans le contexte d’élèves à besoins éducatifs spécifiques au Luxembourg. Comme dans de nombreuses autres formations initiales des enseignants, le temps de terrain (ou stage) représente un moment clé de chaque semestre dans le BScE. Face à la crise sanitaire du COVID-19, ce dispositif de formation à la pratique pédagogique n’a pas pu être conservé. En effet, les écoles étaient fermées, les élèves étaient scolarisés à distance par leur enseignant. Nous avons donc dû rapidement innover et mettre en place des activités d’apprentissage alternatives qui correspondaient au mieux aux objectifs visés par les temps de terrain. Nous avons ainsi demandé à nos étudiants de concevoir et produire, en dyades, des vidéos pédagogiques à destination des écoles du pays. Le but était de permettre à nos étudiants de développer les compétences nécessaires pour réaliser de telles ressources d’apprentissage et de de les mettre à disposition des écoles via Internet. Nous allons décrire, analyser et évaluer le dispositif mis en place, ainsi que les vidéos qui ont été produite. Nous allons également discuter des éventuelles leçons apprises qui conduiront à des adaptations dans notre formation. [less ▲]

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See detailInequalities in the Luxembourgish Educational System: Effects of Language Proficiency on Math Performance Among Different Generations of Immigrant Students
Krämer, Charlotte UL; Rivas, Salvador UL; Reichel, Yanica UL et al

Poster (2020, November 12)

Research indicates students with immigrant background are disadvantaged in educational systems of the host country (e.g., OECD, 2018). In Luxembourg, roughly half of the school population has an immigrant ... [more ▼]

Research indicates students with immigrant background are disadvantaged in educational systems of the host country (e.g., OECD, 2018). In Luxembourg, roughly half of the school population has an immigrant background (Lenz & Heinz, 2018), and several studies indicate these students are considerably disadvantaged in terms of educational achievement levels (Hadjar et al., 2015, 2018). Lower achievement may be partly due to difficulties related to displacement and settling of 1st generation immigrant students. Second and later generation students may however also experience disadvantages as they speak languages at home that are different from the two main languages of instruction (i.e., German and French), and their parents may be less familiar with the educational system and less able to provide support for their children (Alba & Foner, 2016). This may explain why educational inequalities persist; however little is known about the influence of language proficiency of different generations of immigrant students on their performance in other school subjects. Therefore, our poster focuses on the effect of generation after controlling for the effect of language on math competency. Using data from the Luxembourg School Monitoring Programme (Épreuves Standardisées) for the 2016 cohort of 9th grade students in the two main tracks of secondary school (n=4,339), we conduct regression analysis to investigate to what extent language proficiency in German and French and generational status have an impact on math performance. Data indicates that language proficiency in both German and French explains a significant proportion of variance in math performance. In addition, there is a generation effect, whereby 3rd and later generation immigrant students achieve a higher level of math competency than students of the 1st or 2nd generation. Results will be discussed in terms of social mobility and educational inequality. [less ▲]

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See detailThe use of augmented reality, digital and physical modelling in schooling at home in early childhood in Echternach
Haas, Ben; Kreis, Yves UL; Zsolt, Lavicza

Scientific Conference (2020, November 12)

During the confinement of COVID-19, many efforts were made by teachers in elementary school to switch from in-school to schooling at home (Kreis et al., 2020). The use of educational technology in early ... [more ▼]

During the confinement of COVID-19, many efforts were made by teachers in elementary school to switch from in-school to schooling at home (Kreis et al., 2020). The use of educational technology in early childhood (cycle 1), however, is not yet a common practice in elementary schools in Luxemburg. Participation in online video conferences or the use of educational technologies relied in early childhood in significant parts on the disponibility and skills of parents. Younger students were experiencing difficulties in following-up courses requests in schooling at home. From previous research (Haas et al., In Preparation), we designed a conceptual framework on parent assisted remote teaching. Hence, we used these findings to work with 12 early childhood students (ages 4-6), their teachers and parents in schooling at home. Based on the four basic principles of Dienes’s theory of mathematics in physical and digital modelling (Lieban, 2019), we created mathematical modelling tasks with TinkerCad. During two weeks, we collected data through chat responses, web meetings and observations. In this presentation, we will explain insights and how further tasks in schooling at home in early childhood could benefit from this experience. [less ▲]

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See detailGeoGebraTAO: Geometry Learning using a Dynamic Adaptive ICT-Enhanced Environment to Promote String Differentiation of Children's Individual Pathways
Dording, Carole; Max, Charles Joseph UL; Kreis, Yves UL et al

Scientific Conference (2020, November 12)

In our project, we investigate the scientific validity of a specific self-built Adaptive Learning Tool in the field of dynamic geometry with a particular focus on the individual learning pathways of a ... [more ▼]

In our project, we investigate the scientific validity of a specific self-built Adaptive Learning Tool in the field of dynamic geometry with a particular focus on the individual learning pathways of a highly diverse student population. 164 children of Luxembourg elementary schools, aged between 10 and 13 years, acted as test-group and explored elementary geometric concepts in a sequence of learning assignments, created with the dynamic mathematics system GeoGebra integrated into the computer-assisted testing framework TAO. They actively built new knowledge in an autonomous way and at their own pace with only minor support interventions of their teacher. Based on easily exploitable data, collected within a sequence of exploratory learning assignments, the GeoGebraTAO tool analyses the answers provided by the child and performs a diagnostic of the child’s competencies in geometry. With respect to this outcome, the tool manages to identify children struggling with geometry concepts and subsequently proposes a differentiated individual pathway through scaffolding and feedback practices. Short videoclips aim at helping the children to better understand any task in case of need and can be watched voluntarily. Furthermore, a spaced repetition feature is another highly useful component. Pre- and post-test results show that the test-group, working with GeoGebraTAO, and a parallel working control-group, following a traditional paper-and-pencil geometry course, increased their geometry skills and knowledge through the training program; the test-group performed even better in items related to dynamic geometry. In addition, a more precise analysis within clusters, based on similar performances in both pre- and post-tests and the child’s progress within GeoGebraTAO activities, provides evidence of some common ways of working with our dynamic geometry tool, leading to overall improvement at an individualized level. [less ▲]

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See detailStudents’ Personality Relates to Experienced Variability in State Academic Self-Concept
Hausen, Jennifer UL; Möller, Jens; Greiff, Samuel UL et al

Scientific Conference (2020, November 11)

Attaining a positive academic self-concept (ASC) is linked to many desirable educational outcomes. Research on which student attributes relate to the formation of ASC is therefore considered to be central ... [more ▼]

Attaining a positive academic self-concept (ASC) is linked to many desirable educational outcomes. Research on which student attributes relate to the formation of ASC is therefore considered to be central. Past research on the association between personality traits and ASC has taken an interindividual perspective, while the intraindividual perspective has been disregarded. The present research explored the relation between students’ Big Five traits and intraindividual variability in state general-school ASC in everyday school life for the first time using intensive longitudinal data. We drew on N=294 German ninth and tenth graders who completed a three-week e-diary and a previously presented 60-item Big Five questionnaire (BFI-2; Danner et al., 2016; Soto & John, 2017) assessing Open-Mindedness, Conscientiousness, Extraversion, Agreeableness, and Negative Emotionality as well as their respective subfacets (i.e., resulting in 15 subfacets). To assess state ASC, students completed three items after every single lesson across four different subjects (resulting in Mlessons = 21.12). We ran six mixed-effects location scale models: one specified with all five Big Five domains, and five (one for each Big Five domain) with the subfacets as predictors of intraindividual variability in state ASC. We found that Open-Mindedness, Conscientiousness, Extraversion, and Negative Emotionality as well as at least one subfacet of each Big Five trait were significant predictors of levels of state ASC independently of students’ gender and reasoning ability, and the narrower subfacets Organization (Conscientiousness) and Depression (Negative Emotionality) predicted variability in state ASC independently of students’ gender and reasoning ability. These findings thus provide first evidence that students’ ASC undergoes short-term fluctuations from school lesson to school lesson and that this intraindividual variability can be partly explained by students’ personality. Our results thus contribute to a more complete map of the formation of ASC and the role of personality therein. [less ▲]

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See detailTackling educational inequalities using school effectiveness measures
Levy, Jessica UL; Mussack, Dominic UL; Brunner, Martin et al

Scientific Conference (2020, November 11)

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See detailThe health, well-being and life satisfaction of young people in Luxembourg before the COVID-19 pandemic and during deconfinement
Residori, Caroline UL; Schomaker, Léa UL; Samuel, Robin UL

Scientific Conference (2020, November 10)

Background: During 2020, most aspects of young people’s lives have been altered by the COVID-19 pandemic and the measures being implemented to contain it. Early studies on the effects of the COVID-19 ... [more ▼]

Background: During 2020, most aspects of young people’s lives have been altered by the COVID-19 pandemic and the measures being implemented to contain it. Early studies on the effects of the COVID-19 pandemic suggest that confinement (so-called “lockdowns”) affect health, well-being and life satisfaction. However, the current situation in many countries is not confinement but prolonged deconfinement with less strict but still considerable measures and recommendations. Objectives: The possible effects of this deconfinement on the health, well-being and life satisfaction of young people is the focus of this oral presentation, which is based on the YAC-Young Adults and COVID-19 study (see Residori et al., 2020). Methods: The study relies on data collected from a random sample of residents of Luxembourg for the Youth Survey Luxembourg in Mai-July 2019 (age-range: 16-29, n=2.800) and in July 2020 (age-range: 12-29, n=3768, preliminary data). The data was gathered via online survey and using the same items as the HBSC study (self-rated health, life satisfaction (Cantril ladder) and the WHO-5 Well-being Index) (Sozio et al., 2020). Results: The cross-sectional comparison of this representative data, explores the health, wellbeing and life satisfaction of young people in Luxembourg before and during the COVID-19 pandemic. The results are presented for the overall population and detailed by socio-demographic groups. For the 12-15-year-olds, the observed proportion reporting a low life satisfaction (<6) was, for example, 31.3% in 2020. This proportion has increased from 19.9% in 2019 to 25.5 % in 2020 for the 16-20-year-olds, from 23.9% to 35.3 % for the 21-25-year-olds and from 20.2% to 32.8% for the 26-29-year-olds. Conclusion: The presentation will conclude on a reflection of the links between the observed differences and the measures implemented to during deconfinement as well as the scientific and political relevance of the observed differences for Luxembourg and other countries. Literature: Residori, Caroline; Sozio, Maria E.; Schomaker, Lea; Samuel, Robin (2020): YAC – Young People and COVID-19. Preliminary Results of a Representative Survey of Adolescents and Young Adults in Luxembourg. University of Luxembourg: Esch-sur-Alzette Sozio, M., Procopio, A., & Samuel, R. (2020). Youth Survey Luxembourg – Technical Report 2019. Esch-sur-Alzette: University of Luxembourg. [less ▲]

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See detailMixed method situational review of primary family violence care in IMOCAFV
Ares Blanco, Sara; Frese, Thomas; Lacatus, Anca et al

in 90th European General Practice Research Network Meeting (2020, November 10)

Background: The ‘IMOCAFV’ project is developing a multi-country vision on how to provide effective primary care for family violence (FV). In phase I, a situational analysis is performed based on mixed ... [more ▼]

Background: The ‘IMOCAFV’ project is developing a multi-country vision on how to provide effective primary care for family violence (FV). In phase I, a situational analysis is performed based on mixed method review of countries’ policies and interventions, key persons inquiries and professional questionnaires. Aim: Provide in a first phase of IMOCAFV a mixed methods analysis of policies and interventions for primary FV care in different health care settings, high, low and middle income countries. Research questions: How to perform a multi-level in depth mixed method analysis of policies, protocols, problems and good practices on primary FV care? Method: National guidance for FV primary care tasks is centralised into a central online database. Documentation is reviewed online nationally answering questions about prevention, detection, assessment and collaborative care for intimate partner violence, child abuse and elder abuse. Semistructured online inquiries are sent to a pragmatic sample of key persons and professionals in each country. Online training provides guidance for standardized mixed method review of materials. A continuous comparative analysis is made at local and international level; it should provide cues for the Delphi study planned in the second phase. Results: The key questionnaire describes policies and interventions defined for primary health care and advocacy support in different health services settings in three continents. The professional questionnaire describes problems encountered and professionals opinion´s. Different online software packages are suitable for international research collaboration with some limitations. Ethical and security requirements may differ, while high security level applications require more budgets. Conclusions: The organisation of a two-level international qualitative analysis is challenging from a methodological and organisational point of view. A qualitative analysis in a multilanguage context requires specific agreements. Challenges will be discussed using first results. Points for discussion: 1.How to facilitate a good qualitative analysis at both national and international level? 2.How to use different software platforms taking into account countries’ different requirements and organisational facilities in different income countries? [less ▲]

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See detailScanning of questionnaires as a tool to identify difficult questions - lessons learned
Heinz, Andreas UL; van Duin, Claire UL; Catunda, Carolina UL et al

Scientific Conference (2020, November 10)

Background: In 2018, the Luxembourg HBSC team scanned the questionnaires to make the data available faster and to avoid entry errors. Scanning has been shown to be suitable for identifying difficult ... [more ▼]

Background: In 2018, the Luxembourg HBSC team scanned the questionnaires to make the data available faster and to avoid entry errors. Scanning has been shown to be suitable for identifying difficult questions. Objective: The presentation shows which questions were difficult to answer and what the difficulty was. Method: The questionnaires were scanned by student assistants and the data was validated by them if the scanning programme did not detect any errors. If errors occurred (e.g. missing answers or multiple answers), then these questionnaires were checked by HBSC team members. This gave us a systematic overview of which questions were difficult to answer. Results 1. The data from 10000 questionnaires were entered in 6 weeks (half the time needed compared to manual entry in 2014). 2. The MVPA question was frequently the subject of multiple answers. This may indicate that these students use the answer scale as a counting aid. 3. Students who state that they have never smoked in their lives often skip the question about tobacco use in the last month. This behaviour can be explained by Grice's conversational maxims. 4. Behaviours indicating that the answers are not serious (crossed-out questions, crosses outside the boxes, fun answers to open questions) are rare. Conclusions: Scanning is an efficient way to enter many questionnaires in a short time and high quality. Furthermore, it can help to discover difficult questions and to find out what the difficulty is. [less ▲]

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See detailSpecifying key-properties to improve the recognition skills of neural networks
Jahic, Benjamin UL; Guelfi, Nicolas UL; Ries, Benoit UL

Scientific Conference (2020, November 06)

Software engineers are increasingly asked to build datasets for engineering neural network-based software systems. These datasets are used to train neural networks to recognise data. Traditionally, data ... [more ▼]

Software engineers are increasingly asked to build datasets for engineering neural network-based software systems. These datasets are used to train neural networks to recognise data. Traditionally, data scientists build datasets consisting of random collected or generated data. Their approaches are often costly, inefficient and time-consuming. Software engineers rely on these traditional approaches that do not support precise data selection criteria based on customer’s requirements. In this paper, we introduce an extended software engineering method for dataset augmentation to improve neural networks by satisfying the customer’s requirements. We introduce the notion of key-properties to describe the neural network’s recognition skills. Key-properties are used all along the engineering process for developing the neural network in cooperation with the customer. We propose a rigorous process for augmenting datasets based on the analysis and specification of the key-properties. We conducted an experimentation on a case study on the recognition of the state of a digital meter counter. We demonstrate an informal specification of the neural network’s key-properties and a successful improvement of a neural network’s recognition of the meter counter state. [less ▲]

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See detailAnalysing transnational Events through Web archives
Schafer, Valerie UL

Scientific Conference (2020, November 04)

As a co-PI of the WARCnet project, programme chair of this second WARCnet meeting and head of WG2 dedicated to "Analysing transnational Events", Valérie Schafer will give an overview of the challenges ... [more ▼]

As a co-PI of the WARCnet project, programme chair of this second WARCnet meeting and head of WG2 dedicated to "Analysing transnational Events", Valérie Schafer will give an overview of the challenges, issues, achievements, results, case studies, next steps of WG2 since the launch of the WARCnet project. [less ▲]

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See detailSeparation of Concerns Within Robotic Systems Through Proactive Computing
Frantz, Alexandre; Zampunieris, Denis UL

in Proceeding of the 4th IEEE International Conference on Robotic Computing (2020, November)

In this short paper, we first introduce a possible new model for designing and implementing software in robotic systems. This model is based on proactive scenarios, coded through dynamic sets of condition ... [more ▼]

In this short paper, we first introduce a possible new model for designing and implementing software in robotic systems. This model is based on proactive scenarios, coded through dynamic sets of condition-action rules. Each scenario embeds the required rules and can be assembled dynamically with others, allowing the proactive system to achieve a unique objective or behavior and instruct the robot accordingly. Furthermore, a scenario is not aware of the existence of the other scenarios. In fact, it only contains information about a predefined central scenario, which oversees global decision making. In addition, each scenario knows where to enter its suggestions, thus allowing for a high degree in terms of separating concerns and modularity of code. Consequently, allowing easier development, testing and optimization of each scenario independently, possible reuse in different robots, and finally, a faster achievement of robust and scalable robotics software. We then show how to apply this programming model and its functionalities during runtime, by a proof of concept consisting of a virtual robot deployed in the Webots™ simulator. This simulator is controlled with four proactive scenarios (plus the central one), in charge of three different objectives. [less ▲]

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See detailGraph Diffusion Kernel LMS using Random Fourier Features
Gogineni, Vinay; Elias, Vitor R. M.; Alves Martins, Wallace UL et al

in 2020 54th Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, 1-5 November 2020 (2020, November)

This work introduces kernel adaptive graph filters that operate in the reproducing kernel Hilbert space. We propose a centralized graph kernel least mean squares (GKLMS) approach for identifying the ... [more ▼]

This work introduces kernel adaptive graph filters that operate in the reproducing kernel Hilbert space. We propose a centralized graph kernel least mean squares (GKLMS) approach for identifying the nonlinear graph filters. The principles of coherence-check and random Fourier features (RFF) are used to reduce the dictionary size. Additionally, we leverage on the graph structure to derive the graph diffusion KLMS (GDKLMS). The proposed GDKLMS requires only single-hop communication during successive time instants, making it viable for real-time network-based applications. In the distributed implementation, usage of RFF avoids the requirement of a centralized pretrained dictionary in the case of coherence-check. Finally, the performance of the proposed algorithms is demonstrated in modeling a nonlinear graph filter via numerical examples. The results show that centralized and distributed implementations effectively model the nonlinear graph filters, whereas the random feature-based solutions is shown to outperform coherence-check based solutions. [less ▲]

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See detailInequalities in teacher reports on students’ inclusion at school
Zurbriggen, Carmen UL; Nusser, Lena; Schmitt, M.

Scientific Conference (2020, November)

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See detailAn SKOS-Based Vocabulary on the Swift Programming Language
Grevisse, Christian UL; Rothkugel, Steffen UL

in The Semantic Web – ISWC 2020 (2020, November)

Domain ontologies about one or several programming languages have been created in various occasions, mostly in the context of Technology Enhanced Learning (TEL). Their benefits range from modeling ... [more ▼]

Domain ontologies about one or several programming languages have been created in various occasions, mostly in the context of Technology Enhanced Learning (TEL). Their benefits range from modeling learning outcomes, over organization and annotation of learning material, to providing scaffolding support in programming labs by integrating relevant learning resources. The Swift programming language, introduced in 2014, is currently gaining momentum in different fields of application. Both its powerful syntax as well as the provided type safety make it a good language for first-year computer science students. However, it has not yet been the subject of a domain ontology. In this paper, we present an SKOS-based vocabulary on the Swift programming language, aiming at enabling the benefits of previous research for this particular language. After reviewing existing ontologies on other programming languages, we present the modeling process of the Swift vocabulary, its integration into the LOD Cloud and list all of its resources available to the research community. Finally, we showcase how it is being used in different TEL tools. [less ▲]

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See detailDemountable and reusable construction system for steel-concrete composite structures
Odenbreit, Christoph UL; Kozma, Andras UL

in Odenbreit, Christoph; Kozma, Andras (Eds.) Demountable and reusable construction system for steel-concrete composite structures (2020, October 30)

In the face of climate change and the depletion of finite resources, sustainability is becoming increasingly important recently. This is especially true in the construction industry that is responsible ... [more ▼]

In the face of climate change and the depletion of finite resources, sustainability is becoming increasingly important recently. This is especially true in the construction industry that is responsible for the 11% of global carbon dioxide emissions. Besides the technological improvements, the emissions can be further reduced by the application of the principles of the circular economy. This concept is based on the efficient allocation of resources. Three terms are frequently used when talking about this concept: reduce, reuse and recycle. Reducing is cut-ting back on the amount of waste we produce, reusing is finding a new way to use our products so that they do not be-come waste, and recycling is using the materials of our products to produce new materials. The traditional life-cycle of a building usually follows a linear model from the extraction of the raw materials through material production, component manufacturing, construction and building use, until when finally the building is demolished and most of the materials become debris and go into landfill. This is in direct opposition with the concept of circular economy. With proper considerations at the design stage, it is possible to deconstruct whole buildings and re-erect them elsewhere. In the frame of the RFCS Research Project “REDUCE” of the European Commission, a demountable and reusable construction system for steel-concrete composite structures has been recently developed. The system is based on a modular “kit-of-parts” system that uses prefabricated and standardised elements that are easy to manufacture and to assemble with the help of standardised connections. The elements were designed in a systematic way such that, a wide variety of different configurations are possible. In this system, the geometry of all elements respects the planning grid that is based on a basic module size. The research included the development and structural testing of novel demountable and adjustable structural solutions including beam-to-slab, beam-to-beam and beam-to-column connections. During the development of the structural solutions the following aspects were considered: structural performance, safety, installation and tolerances, demountability, corrosion resistance, aesthetics, economy, adaptability, standardisation and environmental impact. The laboratory testing was supplemented by nonlinear numerical studies using the finite element software ABAQUS. Based on the results and the experiences obtained throughout the research project, a design proposal was prepared. One objective of the project was to find structural solutions that are easily applicable and compatible with the current standard de-sign rules. The proposed beam-to-beam and beam-to-column joint is in the scope of EN1993-1-8. The new shear connections behave differently than the traditionally applied welded studs. The cor-responding standard would not allow the equidistant placement of the connectors nor the application of the partial shear theory. This would make the use of demountable shear connections complicated and uneconomical. In order to overcome this issue, a simple algorithm was developed that transforms the elastic-brittle shear connection behaviour into an equivalent ductile rigid-plastic behaviour so that the Eurocode 4 design rules for the determination of the moment resistance of composite beams with partial shear connection remain applicable. The design proposal also contains recommendations to maximize the reuse potential of the building components. This paper presents a general overview of the developed construction system and the corresponding laboratory tests and numerical studies as well as recommendations for the design and application of de-mountable and reusable composite structures. [less ▲]

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See detailDigital Detective Work: Connecting Cheminformatics, Mass Spectrometry and our Environment (analytica Conference)
Schymanski, Emma UL; Bolton, Evan

Scientific Conference (2020, October 20)

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See detailOn the Random Access Procedure of NB-IoT Non-Terrestrial Networks
Kodheli, Oltjon UL; Maturo, Nicola UL; Chatzinotas, Symeon UL et al

Scientific Conference (2020, October 20)

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See detailPresentación del paquete eph
Rosati, German; Kozlowski, Diego UL; Shokida, Natsumi Solange UL et al

Scientific Conference (2020, October 09)

Working with data produced by public sources often encounters several problems: one of the most common is the lack of continuity in the publication of databases. In this regard, the Permanent Household ... [more ▼]

Working with data produced by public sources often encounters several problems: one of the most common is the lack of continuity in the publication of databases. In this regard, the Permanent Household Survey -EPH- of the National Institute of Statistics and Censuses (INDEC) in Argentina is an exception. In fact, this survey has published user databases with information since 1974. However, this has been done in a "non-replicable" way: from changes in the formats of its publication (dbase, .txt, .xls, .sav, etc.) to renaming some variables and recoding their categories, which makes them impractical for continuous use and processing. The lack of an API for the dissemination of information produced by INDEC generates a limit to the information processing capabilities, reducing the users to i) thematic experts with knowledge of how to access sources and ii) media that access information already processed in the form of press releases. This limits the potential value of the enormous work done by the institute, by discouraging its use by users with limited knowledge of the sources, but with data processing capabilities, such as the R community. In turn, certain key indicators presented by the EPH have methodological annexes, but no public implementations that allow the public to make use of the methodology outside the reports prepared by the institute. In this context, the eph package aims to facilitate the work of those users of the Permanent Household Survey - INDEC who wish to process data from it using the programming language R. The library has the following functionalities: i) a unified syntax for downloading, tagging and building datasets with comparable cross-sectional information ii) Implementation of indicator calculation (poverty) using the official methodology Some of its functions are: get_microdata(): Downloads the microdata bases, organize_panels(): Allows to build a panel data pool of the continuous EPH surveys, organize_cno(): Classifies occupations according to the CNO 2001 organize_caes(): Classifies economic activities according to CAES Mercosur 1.0 and CAES Mercosur organize_labels(): Label the bases following the last design map_agglomerates(): Indicator map by agglomerate The package also has other datasets that can be useful for working with the EPH: some dictionaries that contain the coding of geographic variables (such as regions or clusters) or the geographic position (centroids) of the clusters where the survey is conducted. [less ▲]

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See detailBuilding up Explainability in Multi-layer Perceptrons for Credit Risk Modeling
Sharma, Rudrani; Schommer, Christoph UL; Vivarelli, Nicolas

in Sharma, Rudrani (Ed.) Building up Explainability in Multi-layer Perceptrons for Credit Risk Modeling (2020, October 09)

Granting loans is one of the major concerns of financial institutions due to the risks of default borrowers. Default prediction by the neural networks is a popular technique for credit risk modeling ... [more ▼]

Granting loans is one of the major concerns of financial institutions due to the risks of default borrowers. Default prediction by the neural networks is a popular technique for credit risk modeling. Neural networks generally offer the accurate predictions that help banks to prevent financial losses and grow their business by approving more creditworthy borrowers. Although neural networks are capable of capturing the complex, non-linear relationships between a large number of features and output, these models act as black boxes. This is a graduation project paper that is focused on loan default risk prediction by multi-layer perceptron neural network and building up explainability to some degree in the trained neural networks through sensitivity analysis. The architecture of a multi-layer perceptron neural network with the best result is used to help the credit-risk manager in explaining why an applicant is a defaulter or non-defaulter. The prediction of a trained multi-layer perceptron neural network is explained by mapping input features and target variables directly using a model-agnostic explanation as well as a modelspecific explanation. Lastly, a comparison is performed between two explanation methods. [less ▲]

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See detailCollaboration with parents and multiliteracy in early childhood education
Kirsch, Claudine UL; Neumann, Sascha; Aleksic, Gabrijela UL et al

Scientific Conference (2020, October 09)

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See detailResource Allocation for UAV Relay-Assisted IoT Communication Networks
Tran Dinh, Hieu UL; Nguyen, van Dinh UL; Gautam, Sumit UL et al

Scientific Conference (2020, October 06)

This work studies unmanned aerial vehicle (UAV) relay-assisted Internet of Things (IoT) communication networks in which a UAV is deployed as an aerial base station (BS) to collect time-constrained data ... [more ▼]

This work studies unmanned aerial vehicle (UAV) relay-assisted Internet of Things (IoT) communication networks in which a UAV is deployed as an aerial base station (BS) to collect time-constrained data from IoT devices and transfer information to a ground gateway (GW). In this context, we jointly optimize the allocated bandwidth, transmission power, as well as the UAV trajectory to maximize the total system throughput while satisfying the user’s latency requirement and the UAV’s limited storage capacity. The formulated problem is strongly nonconvex which is very challenging to solve optimally. Towards an appealing solution, we first introduce new variables to convert the original problem into a computationally tractable form, and then develop an iterative algorithm for its solution by leveraging the inner approximation method. Numerical results are given to show [less ▲]

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See detailB/Ordering-Prozesse als Bordertexturen
Wille, Christian UL

Scientific Conference (2020, October)

Angesichts jüngster Re-B/Ordering-Tendenzen (Grenzkontrollen an EU-Binnengrenzen, Euroskeptizismus, Nationalismen, Populismus, komplexe Migrationsdynamiken) ist die Grenzforschung zunehmend stärker ... [more ▼]

Angesichts jüngster Re-B/Ordering-Tendenzen (Grenzkontrollen an EU-Binnengrenzen, Euroskeptizismus, Nationalismen, Populismus, komplexe Migrationsdynamiken) ist die Grenzforschung zunehmend stärker herausgefordert, was sich auch oder vor allem in einer bewegten theoretisch-konzeptionellen Debatte widerspiegelt. Sie hat in den letzten Jahrzehnten eine kaum überschaubare Reihe an Ansätzen und Begriffen hervorgebracht, die inspiriert vom practice turn die Grenze als soziale Praxis in den Mittelpunkt stellen. Der in das Panel einführende Beitrag zeichnet diese Entwicklung nach und stellt darauf aufbauend den Ansatz der Bordertexturen näher vor. Dafür werden im ersten Teil drei analytische Trends der aktuellen Grenzforschung idealtypisch unterschieden. Sie stehen dabei für spezifische Schwerpunktsetzungen in der Beschreibung und Analyse von Grenzen: (1) Zunächst wird die Hinwendung zu Grenzen als soziale Produktionen vorgestellt, die sich an Prozessen ihrer (De-)Stabilisierung festmachen lässt und in (diskursiven) Praktiken manifest wird. Daran anschließend wird (2) eine geweitete Auffassung solcher Prozesse herausgearbeitet, die für die Vielheit der daran beteiligten Aspekte sensibilisiert und einen multiplen Zugriff auf Grenz(de)stabilisierungen einfordert. Schließlich wird (3) die Tendenz zu komplexeren Betrachtungen ausgeführt, die Grenz(de)stabilisierungen als Effekte von dynamischen Formationen verstehen. Im zweiten Teil des Vortrags wird der kulturwissenschaftlich orientierte Ansatz der Bordertexturen vorgestellt, der die für B/Ordering-Prozesse wirksamen Formationen von Wissen, Diskursen, Tätigkeiten, Objekten und Körpern als Texturen fasst. Der Texturbegriff soll die komplexe Verflochtenheit der genannten Konstituenten betonen, eine ‚dichte Beschreibung‘ von Grenz(de)stabilisierungen befördern und in der Grenzforschung für die symbolisch-ästhetische Dimension sensibilisieren. Bordertexturen stehen dabei für komplexe Formationen der Grenz(de)stabilisierung, die rhizomartig strukturiert sind, auf ein multiskalares und azentrisches Geflecht verweisen und ästhetische Verarbeitungen ebenso einschließen wie alltagskulturelle Praktiken. Die Einführung des Ansatzes soll zu den Panelvorträgen hinführen, welche die theoretisch-konzeptionellen Überlegungen an unterschiedliche Gegenstandsbereiche anlegen und diskutieren. [less ▲]

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See detailPVDeConv: Point-Voxel Deconvolution for Autoencoding CAD Construction in 3D
Cherenkova, Kseniya UL; Aouada, Djamila UL; Gusev, Gleb

Scientific Conference (2020, October)

We propose a Point-Voxel DeConvolution (PVDeConv) mod- ule for 3D data autoencoder. To demonstrate its efficiency we learn to synthesize high-resolution point clouds of 10k points that densely describe ... [more ▼]

We propose a Point-Voxel DeConvolution (PVDeConv) mod- ule for 3D data autoencoder. To demonstrate its efficiency we learn to synthesize high-resolution point clouds of 10k points that densely describe the underlying geometry of Computer Aided Design (CAD) models. Scanning artifacts, such as pro- trusions, missing parts, smoothed edges and holes, inevitably appear in real 3D scans of fabricated CAD objects. Learning the original CAD model construction from a 3D scan requires a ground truth to be available together with the corresponding 3D scan of an object. To solve the gap, we introduce a new dedicated dataset, the CC3D, containing 50k+ pairs of CAD models and their corresponding 3D meshes. This dataset is used to learn a convolutional autoencoder for point clouds sampled from the pairs of 3D scans - CAD models. The chal- lenges of this new dataset are demonstrated in comparison with other generative point cloud sampling models trained on ShapeNet. The CC3D autoencoder is efficient with respect to memory consumption and training time as compared to state- of-the-art models for 3D data generation. [less ▲]

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See detailZwischen Gehege und Idylle: Durs Grünbeins "Heimat"
Kohns, Oliver UL

Scientific Conference (2020, October)

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See detailLeveraging Natural-language Requirements for Deriving Better Acceptance Criteria from Models
Veizaga Campero, Alvaro Mario UL; Alferez, Mauricio UL; Torre, Damiano UL et al

in Proceedings of 23rd ACM / IEEE International Conference on Model Driven Engineering Languages and Systems (MODELS) (2020, October)

In many software and systems development projects, analysts specify requirements using a combination of modeling and natural language (NL). In such situations, systematic acceptance testing poses a ... [more ▼]

In many software and systems development projects, analysts specify requirements using a combination of modeling and natural language (NL). In such situations, systematic acceptance testing poses a challenge because defining the acceptance criteria (AC) to be met by the system under test has to account not only for the information in the (requirements) model but also that in the NL requirements. In other words, neither models nor NL requirements per se provide a complete picture of the information content relevant to AC. Our work in this paper is prompted by the observation that a reconciliation of the information content in NL requirements and models is necessary for obtaining precise AC. We perform such reconciliation by devising an approach that automatically extracts AC-related information from NL requirements and helps modelers enrich their model with the extracted information. An existing AC derivation technique is then applied to the model that has now been enriched by the information extracted from NL requirements. Using a real case study from the financial domain, we evaluate the usefulness of the AC-related model enrichments recommended by our approach. Our evaluation results are very promising: Over our case study system, a group of five domain experts found 89% of the recommended enrichments relevant to AC and yet absent from the original model (precision of 89%). Furthermore, the experts could not pinpoint any additional information in the NL requirements which was relevant to AC but which had not already been brought to their attention by our approach (recall of 100%) [less ▲]

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See detailAll for one and one for all: Recommendations for Sustainable International Lunar Base Utilization and Exploration Approaches
Salmeri, Antonino UL; Poliacek, Matej

in Proceedings of the 71st International Astronautical Congress - The Cyberspace Edition (2020, October)

The return to the Moon is widely regarded as the next step of space exploration. Fifty years after the first Apollo mission, a renewed interest is fostering large global efforts in pursuing the scientific ... [more ▼]

The return to the Moon is widely regarded as the next step of space exploration. Fifty years after the first Apollo mission, a renewed interest is fostering large global efforts in pursuing the scientific and economic opportunities offered by cislunar space. The ultimate goal is to establish a sustainable human and robotic presence on the lunar surface as specified in Phase 2 of NASA’s Artemis Program. These perspectives are deeply intertwined with the rapid growth of the private space sector and the arising geopolitical complexities, related to utilisation of outer space among space-faring nations. This study summarises the results and recommendations of the NASA-sponsored Space Exploration Working Group within the Space Generation Congress 2019, organised by the Space Generation Advisory Council in Washington, D.C. The Working Group consisted of 26 delegates from 15 different countries and representatives from NASA Headquarters. The group examined the evolution of lunar exploration in terms of international cooperation, socio-economic and technological challenges, and the inclusion of private industry. This report discusses the political, economic, and technological trade-offs between a multi-agency/multinational monolithic lunar base to multiple lunar bases operated by individual nations. Using the International Space Station as a model for international cooperation, the working group concluded that an initial infrastructure of a single station requiring a collaborative effort between nations and commercial stakeholders is the recommended approach. From this foothold, the presence is expanded to multiple bases with a standardization of planning, building, and operating lunar bases. Strategic recommendations were identified to be addressed to the United Nations and other public/private stakeholders with the vision of a cooperative legal and technical framework as the optimal foundation for a sustainable lunar economy. Recommendations include developing international guidelines for cooperation, establishing international standards for stakeholders, implementing conflict resolution avenues, configuring a single international base, and expanding global partnerships. [less ▲]

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See detailA Social License to Operate for Lunar Resources Activities: Towards a Fair and Sustainable Era of Space Exploration
Salmeri, Antonino UL; Villegas, Maria Camila

in Proceedings of the 71st International Astronautical Congress - The Cyberspace Edition (2020, October)

Five years ago, soon after his nomination as ESA Director General, Jan Wörner announced the concept of a Moon Village as “an environment where both international cooperation and the commercialization of ... [more ▼]

Five years ago, soon after his nomination as ESA Director General, Jan Wörner announced the concept of a Moon Village as “an environment where both international cooperation and the commercialization of space can thrive”. Today, this concept is more alive than ever and is rapidly moving to its implementation through a series of lunar resources missions planned for as soon as 2021. In line with the spirit of cooperation and sustainability of the Moon Village, this paper addresses how lunar resources activities can become a model for fair and sustainable space exploration through the development of a Social License to Operate (SLO). SLO is defined as the efforts made by a company or entity in order to give back part of the wealth it produces to the community where it operates. On Earth, this is usually done through environmentally friendly practices, information disclosure and a various range of activities aimed at community support such as job creations, educational activities and technology transfer. Mutatis mutandis, current Earth practice on SLO can be implemented in lunar resources activities in order to ensure that they are conducted “for the benefit and interest of all Countries”, as required by Article I OST. Building on the research conducted by the Socio-Economic Panel of The Hague International Space Resources Governance Working Group, this paper explores how the development of a Social License to Operate for Lunar activities can shape a new era of fair and sustainable space exploration. Guided by the principle of adaptive governance, the paper presents the benefits of Lunar SLOs as tailored for the early stages of lunar activities. To this end, Chapter 1 presents the definition of SLO, how it is used on Earth, the experience of some countries, and the way it is granted. Following, Chapter 2 discusses the rationale for implementing SLOs for lunar activities, and how they can contribute to the early development of lunar activities. Based on the above, Chapter 3 discusses three basic features for Lunar SLOs, arguing that they should be multigoverned, multipurposes and multi-incentives. Finally, Section 4 provides a practical example of how a Lunar SLO could be structured in practice, and then the paper draws the final conclusions. Please note that this paper has been developed under the auspices of the Space Generation Advisory Council, as part of the activities of the Space Exploration Project Group [less ▲]

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See detailWaste Management for Lunar Resources Activities: Towards a Circular Lunar Economy
Salmeri, Antonino UL; Pino, Paolo; Humes, Shayna et al

in Proceedings of the 71st International Astronautical Congress - The Cyberspace Edition (2020, October)

Space resources activities are currently the objective of a thriving, cross-disciplinary, global effort aimed at assessing their role and potential in the future of humankind. New, innovative mission ... [more ▼]

Space resources activities are currently the objective of a thriving, cross-disciplinary, global effort aimed at assessing their role and potential in the future of humankind. New, innovative mission concepts, legal frameworks, and advanced technologies are being actively developed and proposed with the final goal of enabling profitable and efficient space resource utilization. The immediate location for these impacts is the Moon. In sight of this bright cohort of imminent perspectives, it’s imperative for the global community to properly assess the potential effects and consequences of the forthcoming space resources activities, with the goal of including sustainability in the foundations of the ongoing progress and ensuring its enforcement in every future endeavour. Within this context, this paper addresses the topics of Moon mining waste management and a lunar circular economy as key issues in the sustainable utilization of space resources. The most promising technologies are considered for lunar resources extraction and processing - with special focus on water - correlating their waste generation potential to the scale of the efforts implemented and to the projected availability of the resources of interest. Importance is also given to the corollary activities of space mining - such as logistics and transport operations - for their implications in waste management. Protocols and technologies with the lower waste generation potential are identified and further scenarios are elaborated for waste handling, reduction, reuse, and recycle, as well as end-of-life strategies for mining plants. This report’s recommendations are proposed for the development of incremental regulation for waste management, including but not limited to the definition of common areas of non-interest for waste disposal and regulatory obligations for conducting impact assessments before the establishment of mining activities. Please note that the present paper has been developed under the auspices of the Space Generation Advisory Council, as part of the activities of the Space Exploration Project Group. [less ▲]

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See detail3D SPARSE DEFORMATION SIGNATURE FOR DYNAMIC FACE RECOGNITION
Shabayek, Abd El Rahman UL; Aouada, Djamila UL; Cherenkova, Kseniya UL et al

in 27th IEEE International Conference on Image Processing (ICIP 2020), Abu Dhabi 25-28 October 2020 (2020, October)

Detailed reference viewed: 43 (0 UL)
See detailComparison of Multidisciplinary Design Optimization Architectures for the design of Distributed Space Systems
Pandi Perumal, Raja UL; Voos, Holger UL; Dalla Vedova, Florio et al

in Pandi Perumal, Raja; Voos, Holger; Dalla Vedova, Florio (Eds.) et al Proceedings of the 71st International Astronautical Congress 2020 (2020, October)

Advancement in satellite technology, and the ability to mass-produce cost-effective small satellites has created a compelling interest in Distributed Space System (DSS), such as Low Earth Orbit (LEO ... [more ▼]

Advancement in satellite technology, and the ability to mass-produce cost-effective small satellites has created a compelling interest in Distributed Space System (DSS), such as Low Earth Orbit (LEO) satellite constellations. Optimization of DSS is a complex Multidisciplinary Design Optimization (MDO) problem involving a large number of variables and coupling relations. This paper focuses on comparing three different MDO architectures for a DSS design problem. Initially, an overview of the constellation model, the subsystems model, and the coupling relationships between the subsystems and the constellation are provided. The modelling of the subsystems and the constellation configuration are carried out in OpenMDAO. Later, three monolithic MDO architectures, namely, Individual Discipline Feasible (IDF), Simultaneous Analysis and Design (SAND) and Multidisciplinary Feasible (MDF) are compared by implementing them to the developed DSS model. The results indicate IDF outperforms the rest of the architectures for the conceptual design of DSS. The optimum objective function obtained by IDF is 1% lower than SAND and 7% lower than MDF. While the functional evaluation required for IDF is 50% lower than SAND and 90% lower than MDF. [less ▲]

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See detailDer Wert digitaler Güter - Steuerrechtliche Einordnung
Sinnig, Julia UL

in Gräfe, Hans-Christian; Telemedicus e.V. (Eds.) Tagungsband zur Sommerkonferenz 2019: Über den Tellerrand (2020, October)

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See detailDeveloping and Managing Moon and Mars Settlements in Accordance with International Space Law
Salmeri, Antonino UL

in Proceedings of the 71st International Astronautical Congress 2020 (2020, October)

Despite still being a few decades in the future, the idea of establishing an extra-terrestrial settlement on another celestial body, being it the Moon or Mars, has never been so strong. Moving from the ... [more ▼]

Despite still being a few decades in the future, the idea of establishing an extra-terrestrial settlement on another celestial body, being it the Moon or Mars, has never been so strong. Moving from the premise that future Moon and Mars settlements shall not take place in a lawless space, this paper addresses the question of how to develop and manage them in accordance with international space law. To this end, it conducts a systematic analysis of the Outer Space Treaty (OST), with the goal of assessing the scope of the freedom to use celestial bodies under international space law. Based on this analysis, and building on the successful experience of the International Space Station, the paper proposes the development of open international settlements made of shared modular facilities. In accordance with the principles of adaptive governance and subsidiarity, the paper argues that the regulation of such settlements should be based on a multi-level framework integrating international recommendations and bilateral arrangements. Under the proposed governance scheme, international recommendations should provide a general framework enabling the development of the settlement, while leaving its management to the mutual agreement of the parties. Finally, the paper presents four essential goals to be achieved by the recommendations and ultimately concludes by arguing that while international cooperation in the development and management of extra-terrestrial settlements is not a legal obligation, it may very well be the only political option that we have to preserve the peaceful uses of outer space. [less ▲]

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See detailAugmented Reality in Manual Assembly Processes
Kolla, Sri Sudha Vijay Keshav UL; Sanchez, Andre UL; Minoufekr, Meysam UL et al

in Kolla, Sri Sudha Vijay Keshav; Sanchez, Andre; Minoufekr, Meysam (Eds.) et al Augmented Reality in Manual Assembly Processes (2020, September 23)

Augmented Reality (AR) is a novel technology that projects virtual information on the real world environment. With the increased use of Industry 4.0 technologies in manufacturing, AR has gained momentum ... [more ▼]

Augmented Reality (AR) is a novel technology that projects virtual information on the real world environment. With the increased use of Industry 4.0 technologies in manufacturing, AR has gained momentum across various stages of product life cycle. AR can benefit production operators in many manufacturing tasks such as quality inspection, work instructions for manual assembly, maintenance, and in training. This research presents not only a typical architecture of an AR system but also both its software and hardware functions. The architecture is then applied to display virtual assembly instructions in the form of 3D animations on to the real world environment. The chosen assembly task in this research is to assemble a planetary gearbox system. The assembly instructions are displayed on a mobile device targeting a static tracker placed in the assembly environment. [less ▲]

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See detailActor-Critic Deep Reinforcement Learning for Energy Minimization in UAV-Aided Networks
Yuan, Yaxiong UL; Lei, Lei UL; Vu, Thang Xuan UL et al

in 2020 European Conference on Networks and Communications (EuCNC) (2020, September 21)

In this paper, we investigate a user-timeslot scheduling problem for downlink unmanned aerial vehicle (UAV)-aided networks, where the UAV serves as an aerial base station. We formulate an optimization ... [more ▼]

In this paper, we investigate a user-timeslot scheduling problem for downlink unmanned aerial vehicle (UAV)-aided networks, where the UAV serves as an aerial base station. We formulate an optimization problem by jointly determining user scheduling and hovering time to minimize UAV’s transmission and hovering energy. An offline algorithm is proposed to solve the problem based on the branch and bound method and the golden section search. However, executing the offline algorithm suffers from the exponential growth of computational time. Therefore, we apply a deep reinforcement learning (DRL) method to design an online algorithm with less computational time. To this end, we first reformulate the original user scheduling problem to a Markov decision process (MDP). Then, an actor-critic-based RL algorithm is developed to determine the scheduling policy under the guidance of two deep neural networks. Numerical results show the proposed online algorithm obtains a good tradeoff between performance gain and computational time. [less ▲]

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See detailMeasuring the Environmental Exposome (ISES2020)
Schymanski, Emma UL

Scientific Conference (2020, September 21)

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See detailPractical Use Cases for Ethernet Redundancy
Pannell, Don; Navet, Nicolas UL

Scientific Conference (2020, September 17)

Autonomous driving requires safety considerations and the need of “fail operational” requires redundancy. In the networking portion of a car, this may mean separate networks, possibly of different ... [more ▼]

Autonomous driving requires safety considerations and the need of “fail operational” requires redundancy. In the networking portion of a car, this may mean separate networks, possibly of different technologies. Or it could mean a network topology and technology that supports scalable redundancy, like Ethernet TSN. This presentation focuses on IEEE 802.1CB-2017, which is the TSN standard that supports data redundancy through the network. Various network topologies are examined. The relative costs of adding TSN redundancy for these topologies (including some, or all of, the end-stations/ECUs & bridges) are examined for various bandwidth utilizations, along with the expected packet loss. Each topology and bandwidth will be modeled under various bit-rate error values with the results discussed. This presentation aims at providing a clear understanding of the TSN standards that support redundancy, and an understanding of the cost/benefit tradeoffs so proper engineering decisions can be made and proper expectations set. [less ▲]

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See detailSchadstoffen auf der Spur mit Umweltcheminformatik
Schymanski, Emma UL

Scientific Conference (2020, September 17)

Detailed reference viewed: 39 (0 UL)
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See detailScaling of urban heat island & NO2 with urban population: a meta-analysis
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2020, September 16)

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See detailTowards Computer-Aided, Iterative TSN-and Ethernet-based E/E Architecture Design
Creighton, Oliver; Navet, Nicolas UL; Keller, Patrick UL et al

Scientific Conference (2020, September 16)

In this presentation we would like to propose a novel approach towards studying and simulating candidate designs of next generation Ethernet architectures at established OEMs that intend to employ 100BASE ... [more ▼]

In this presentation we would like to propose a novel approach towards studying and simulating candidate designs of next generation Ethernet architectures at established OEMs that intend to employ 100BASE-T1, 1000BASE-T1 and, for increased flexibility and lower cost, 10BASE-T1S. Typical design goals of next generation architectures are future extensibility and cost optimization of the lowest-end. We propose to introduce guidance to an otherwise standard Monte-Carlo simulation by providing certain fixed points (e.g., mandated connections of ECUs to certain bridges, complete re-use of ECUs) and “hot spots” in the topology (e.g., ECUs with the highest variability pressure) that are known in advance from BMW’s experience with their vehicles in the field. Several important practical considerations must be integrated in the generation of candidate architectures: - Topological constraints: ECU proximity to sensors, daisy chain connections between ECUs to minimize cable length, number of switch ports in a certain ECU, etc. - Security and reliability requirements: segregation between mixed-criticality streams, proxy ECUs, and redundant paths. Our position statement explores the ability of algorithmic tools to synthesize Ethernet-based architectures based on a minimal fixed core TSN topology, design goals, design constraints, assumptions about next generation applications and data from past projects (capturing part of the OEM domain knowledge). [less ▲]

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See detailActive Re-identification Attacks on Periodically Released Dynamic Social Graphs
Chen, Xihui UL; Kepuska, Ema UL; Mauw, Sjouke UL et al

in Chen, Liqun; Li, Ninghui; Liang, Kaitai (Eds.) et al Computer Security - ESORICS 2020 (2020, September 13)

Active re-identification attacks pose a serious threat to privacy-preserving social graph publication. Active attackers create fake accounts to enforce structural patterns that can be used to re-identify ... [more ▼]

Active re-identification attacks pose a serious threat to privacy-preserving social graph publication. Active attackers create fake accounts to enforce structural patterns that can be used to re-identify legitimate users on published anonymised graphs, even without additional background knowledge. So far, this type of attacks has only been studied in the scenario where the inherently dynamic social graph is published once. In this paper, we present the first active re-identification attack in the more realistic scenario where a dynamic social graph is periodically published. Our new attack leverages tempo-structural patterns, created by a dynamic set of sybil nodes, for strengthening the adversary. We evaluate our new attack through a comprehensive set of experiments on real-life and synthetic dynamic social graphs. We show that our new attack substantially outperforms the most effective static active attack in the literature by increasing success probability by at least two times and efficiency by at least 11 times. Moreover, we show that, unlike the static attack, our new attack remains at the same level of efficiency as the publication process advances. Additionally, we conduct a study on the factors that may thwart our new attack, which can help design dynamic graph anonymisation methods displaying a better balance between privacy and utility. [less ▲]

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See detailAutomatic Detection of Nigrosome Degeneration in Susceptibility-Weighted MRI for Computer-Aided Diagnosis of Parkinson’s Disease Using Machine Learning
Garcia Santa Cruz, Beatriz UL; Husch, Andreas UL; Hertel, Frank UL

in Movement Disorders: Volume 35, Number S1, September 2020 (2020, September 12)

Objective: Automatize the detection of ‘swallow-tail’ appearance in substantia nigra dopaminergic neurons using MRI for more robust tests on Parkinson’s disease (PD) diagnosis. Background: Differential ... [more ▼]

Objective: Automatize the detection of ‘swallow-tail’ appearance in substantia nigra dopaminergic neurons using MRI for more robust tests on Parkinson’s disease (PD) diagnosis. Background: Differential diagnosis of PD is challenging even in specialized centers. The use of imaging techniques can be bene cial for the diagnosis. Although DaTSCAN has been proven to be clinically useful, it is not widely available and has radiation risk and high-cost associated. Therefore, MRI scans for PD diagnosis offer several advantages over DaTSCAN [1]. Recent literature shows strong evidence of high diagnostic accuracy using the ‘swallow-tail’ shape of the dorsolateral substantia nigra in 3T – SWI [2]. Nevertheless, the majority of such studies rely on the subjective opinion of experts and manual methods for the analysis to assess the accuracy of these features. Alternatively, we propose a fully automated solution to evaluate the absence or presence of this feature for computer-aided diagnosis (CAD) of PD. Method: Restrospective study of 27 PD and 18 non-PD was conducted, including standard high-resolution 3D MRI – T1 & SWI sequences (additionally, T2 scans were used to increase the registration references). Firstly, spatial registration and normalization of the images were performed. Then, the ROI was extracted using atlas references. Finally, a supervised machine learning model was built using 5-fold-within-5-fold nested cross-validation. Results: Preliminary results show signi cant sensitivity (0.92) and ROC AUC (0.82), allowing for automated classi cation of patients based on swallow-tail biomarker from MRI. Conclusion: Detection of nigrosome degeneration (swallow-tail biomarker) in accessible brain imaging techniques can be automatized with signi cant accuracy, allowing for computer-aided PD diagnosis. References: [1] Schwarz, S. T., Xing, Y., Naidu, S., Birchall, J., Skelly, R., Perkins, A., ... & Gowland, P. (2017). Protocol of a single group prospective observational study on the diagnostic value of 3T susceptibility weighted MRI of nigrosome-1 in patients with parkinsonian symptoms: the N3iPD study (nigrosomal iron imaging in Parkinson’s disease). BMJ open, 7(12), e016904. [2] – Schwarz, S. T., Afzal, M., Morgan, P. S., Bajaj, N., Gowland, P. A., & Auer, D. P. (2014). The ‘swallow tail’ appearance of the healthy nigrosome –a new accurate test of Parkinson’s disease: a case-control and retrospective cross-sectional MRI study at 3T. PloS one, 9(4). [less ▲]

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See detailGoverning Health in the European Semester: Towards the Economy of Wellbeing?
Muñoz, Susana UL

Scientific Conference (2020, September 11)

Health is a key component of the Economy of Wellbeing, the new horizontal approach to political decision-making and governance adopted by the Council of the European Union on 24 October 2019. Building on ... [more ▼]

Health is a key component of the Economy of Wellbeing, the new horizontal approach to political decision-making and governance adopted by the Council of the European Union on 24 October 2019. Building on the principles of the European Pillar of Social Rights and on the Health in All Policies and One Health approaches, it seeks to strengthen the role of employment, social, health and education policies within the European Semester. Nevertheless, “wellbeing” acquires a new resonance for the post COVID-19 “Economy of Recovery”. Against this backdrop, this paper aims to provide a critical review of the effectiveness of the European Semester as a governance tool for the “wellbeing” policies from the perspective of EU law and policy- making and enforcement. It also examines future prospects in the light of the multiple impacts of the current health and socioeconomic crises. [less ▲]

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See detailTowards Privacy Preserving Data Centric Super App
Carvalho Ota, Fernando Kaway UL; Meira, Jorge Augusto UL; Frank, Raphaël UL et al

in Carvalho Ota, Fernando Kaway; Meira, Jorge Augusto; Frank, Raphaël (Eds.) et al 2020 Mediterranean Communication and Computer Networking Conference, Arona 17-19 June 2020 (2020, September 10)

The number of smartphone users recently surpassed the numbers of desktop users on Internet, and opened up countless development challenges and business opportunities. Not only the fact that the majority ... [more ▼]

The number of smartphone users recently surpassed the numbers of desktop users on Internet, and opened up countless development challenges and business opportunities. Not only the fact that the majority of users are connected using their smartphones, but the number of Internet users in general has popularized the massive use of data-driven applications. In this context, the concept of super apps seems to be the next game-changer for the mobile apps industry, and the challenges related to security and privacy are key aspects for keeping user data safe. Thus, by combining different components for provisioning, authentication, membership and others, we propose a novel framework that enables the creation of a super app using privacy by design principles. [less ▲]

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See detailFostering process skills with the educational technology software MathemaTIC in elementary schools
Haas, Ben; Kreis, Yves UL; Lavicza, Zsolt

in Donevska-Todorova, Ana; Faggiano, Eleonora; Trgalova, Jana (Eds.) et al Proceedings of the 10th ERME TOPIC CONFERENCE (ETC10) on Mathematics Education in the Digital Age (MEDA) (2020, September 07)

This study reports the use of automated tutoring and scaffolding implemented in the module “arithmetic word problem” in the educational technology software MathemaTIC in grade 3 (age 8 to 10). We examined ... [more ▼]

This study reports the use of automated tutoring and scaffolding implemented in the module “arithmetic word problem” in the educational technology software MathemaTIC in grade 3 (age 8 to 10). We examined 246 students with access to MathemaTIC and receiving tutoring and scaffolding through a one-to-one learning setting with this technology. The control group (n=226) had access to the same learning tasks and worked with paper-and-pencil without MathemaTIC but with their teachers. Results showed that the experimental group finished with higher outcome scores than the control group. This paper will outline the study and attempts to explain these results. [less ▲]

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See detaildigitizing of Research and Teaching
Plapper, Peter UL

Scientific Conference (2020, September 05)

The current Covid-19 crisis impacts all manufacturing areas and new processes are sought. This presentation provides the audience with three examples related to assembly work instructions, logistics data ... [more ▼]

The current Covid-19 crisis impacts all manufacturing areas and new processes are sought. This presentation provides the audience with three examples related to assembly work instructions, logistics data handling and manufacturing education, for which innovative ways to obtain access to context sensitive data based on digital tools are investigated. Augmented Reality (AR) and Virtual Reality (VR) facilitate access to relevant manufacturing information. In order to provide logistic warehouse workers with immediate access to shipping documents, to avoid paper print-outs, and to eliminate error-prone typing of information, critical information should be handled digitally and hands-free. To support logistic workers to efficiently document, register and trace receipt, storage or delivery of goods, the presented solution is built on hands-free digital tools with AR technology in commercially available smart glasses. Similarly, workers who execute complex assembly operations frequently require either assistance or support for the next assembly step. Depending on the context, relevant assembly process information is automatically displayed together with the environment in the AR smart glass. Thus, the operator is supported by the presented hands-free-tool to complete the next challenging tasks. Currently, teaching is being transferred from physical class-room teaching to remote or hybrid education. For this purpose, Virtual Reality (VR) provides a very welcome opportunity to complement in-presence teaching with exposure to examples of real manufacturing operations captured in videos of industrial case studies. Students apply learnings from theoretical classes to manufacturing case studies by identifying best practices and also recognizing waste. The presentation shares experience in teaching of lean methods based on AR technology to graduate engineering students. [less ▲]

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See detailBioKC: a platform for quality controlled curation and annotation of systems biology models
Vega Moreno, Carlos Gonzalo UL; Groues, Valentin UL; Ostaszewski, Marek UL et al

Scientific Conference (2020, September 04)

Standardisation of biomedical knowledge into systems biology models is essential for the study of the biological function. However, biomedical knowledge curation is a laborious manual process aggravated ... [more ▼]

Standardisation of biomedical knowledge into systems biology models is essential for the study of the biological function. However, biomedical knowledge curation is a laborious manual process aggravated by the ever increasing growth of biomedical literature. High quality curation currently relies on pathway databases where outsider participation is minimal. The increasing demand of systems biology knowledge presents new challenges regarding curation, calling for new collaborative functionalities to improve quality control of the review process. These features are missing in the current systems biology environment, whose tools are not well suited for an open community-based model curation workflow. On one hand, diagram editors such as CellDesigner or Newt provide limited annotation features. On the other hand, most popular text annotations tools are not aimed for biomedical text annotation or model curation. Detaching the model curation and annotation tasks from diagram editing improves model iteration and centralizes the annotation of such models with supporting evidence. In this vain, we present BioKC, a web-based platform for systematic quality-controlled collaborative curation and annotation of biomedical knowledge following the standard data model from Systems Biology Markup Language (SBML). [less ▲]

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See detailAn AI-assisted Approach for Checking the Completeness of Privacy Policies Against GDPR
Torre, Damiano UL; Abualhaija, Sallam UL; Sabetzadeh, Mehrdad UL et al

in in Proceedings of the 28th IEEE International Requirements Engineering Conference (RE’20) (2020, September)

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See detailForest SaVR – A Virtual-Reality Application to Raise Awareness of Deforestation
Botev, Jean UL; Viegas Milani, Adriano

in Proceedings of the 17th GI VR/AR Workshop (VAR) (2020, September)

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See detailDeepNDN: Opportunistic Data Replication and Caching in Support of Vehicular Named Data
Manzo, Gaetano; Kalogeiton, Eirini; di Maio, Antonio UL et al

in 21st IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM) (2020, September)

Although many target applications in VANETs are information-centric, the performance of Named Data Networking (NDN) in vehicular ad-hoc networks is severely hampered by persistent network partitioning ... [more ▼]

Although many target applications in VANETs are information-centric, the performance of Named Data Networking (NDN) in vehicular ad-hoc networks is severely hampered by persistent network partitioning, typical of many vehicular scenarios. Existing approaches try to address this issue by relying on opportunistic communications. However, they leave open the crucial issue of how to guarantee content persistence and tight QoS levels while optimizing the resource utilization in the vehicular environment. In this work we propose DeepNDN, a communication scheme based on the joint application of NDN and of probabilistic spatial content caching, which enables content retrieval in fragmented and dynamic network topologies with tight delay constraints. We present a data-based approach to DeepNDN management, based on locally modulating content replication and delivery in order to achieve a target hit ratio in a resource-efficient manner. Our management algorithm employs a Convolutional Neural Network (CNN) architecture for effectively capturing the complex relations between spatio-temporal patterns of mobility and content requests and DeepNDN performance. Its numerical assessment in realistic, measurement-based scenarios suggest that our management approach achieves its target set goals while outperforming a set of reference schemes. [less ▲]

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See detailTrace-Checking Signal-based Temporal Properties: A Model-Driven Approach
Boufaied, Chaima UL; Menghi, Claudio UL; Bianculli, Domenico UL et al

in Proceedings of the 35th IEEE/ACM International Conference on Automated Software Engineering (ASE ’20) (2020, September)

Signal-based temporal properties (SBTPs) characterize the behavior of a system when its inputs and outputs are signals over time; they are very common for the requirements specification of cyber-physical ... [more ▼]

Signal-based temporal properties (SBTPs) characterize the behavior of a system when its inputs and outputs are signals over time; they are very common for the requirements specification of cyber-physical systems. Although there exist several specification languages for expressing SBTPs, such languages either do not easily allow the specification of important types of properties (such as spike or oscillatory behaviors), or are not supported by (efficient) trace-checking procedures. In this paper, we propose SB-TemPsy, a novel model-driven trace-checking approach for SBTPs. SB-TemPsy provides (i) SB-TemPsy-DSL, a domain-specific language that allows the specification of SBTPs covering the most frequent requirement types in cyber-physical systems, and (ii) SB-TemPsy-Check, an efficient, model-driven trace-checking procedure. This procedure reduces the problem of checking an SB-TemPsy-DSL property over an execution trace to the problem of evaluating an Object Constraint Language constraint on a model of the execution trace. We evaluated our contributions by assessing the expressiveness of SB-TemPsy-DSL and the applicability of SB-TemPsy-Check using a representative industrial case study in the satellite domain. SB-TemPsy-DSL could express 97% of the requirements of our case study and SB-TemPsy-Check yielded a trace-checking verdict in 87% of the cases, with an average checking time of 48.7 s. From a practical standpoint and compared to state-of-the-art alternatives, our approach strikes a better trade-off between expressiveness and performance as it supports a large set of property types that can be checked, in most cases, within practical time limits. [less ▲]

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