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See detailUne cour constitutionnelle différente des autres. Etendue, raisons & avenir de l'originalité de la Cour constitutionnelle luxembourgeoise
Heuschling, Luc UL

in Gerkrath, Jörg (Ed.) Les 20 ans de la Cour Constitutionnelle: trop jeune pour mourir? (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 detailAn Investigation of Compression Techniques to Speed up Mutation Testing
Zhu; Panichella, Annibale UL; Zaidman, Andy

in 11th IEEE Conference on Software Testing, Validation and Verification, 2018 (in press)

Mutation testing is widely considered as a high-end test coverage criterion due to the vast number of mutants it generates. Although many efforts have been made to reduce the computational cost of ... [more ▼]

Mutation testing is widely considered as a high-end test coverage criterion due to the vast number of mutants it generates. Although many efforts have been made to reduce the computational cost of mutation testing, in practice, the scalability issue remains. In this paper, we explore whether we can use compression techniques to improve the efficiency of strong mutation based on weak mutation information. Our investigation is centred around six mutation compression strategies that we have devised. More specifically, we adopt overlapped grouping and Formal Concept Analysis (FCA) to cluster mutants and test cases based on the reachability (code covergae) and necessity (weak mutation) conditions. Moreover, we leverage mutation knowledge (mutation locations and mutation operator types) during compression. To evaluate our method, we conducted a study on 20 open source Java projects using manually written tests. We also compare our method with pure random sampling and weak mutation. The overall results show that mutant compression techniques are a better choice than random sampling and weak mutation in practice: they can effectively speed up strong mutation 6.3 to 94.3 times with an accuracy of >90%. [less ▲]

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See detailLe récit de voyage comme rupture de contrat
Roelens, Nathalie UL

in Acta Fabula : Revue des Parutions en Théorie Littéraire (in press)

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See detailEntwicklungen der sexualwissenschaftlichen und rechtlichen Debatten zu Transsexualität und deren Verschränkungen in der Bundesrepublik Deutschland (1960er Jahre bis 1980)
De Silva, Adrian UL

in 'Auf nach Casablanca?' Lebensrealitäten transgeschlechtlicher Menschen zwischen 1945-1980 (in press)

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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 detailNeue Staaten – neue Grenzen. Die Rhein-Maas-Mosel-Region zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress (1779 – 1816)
Uhrmacher, Martin UL

in Fickers, Andreas; Franz, Norbert; Laux, Stephan (Eds.) et al Repression, Reform und Neuordnung im Zeitalter der Revolutionen: Die Folgen des Wiener Kongresses für Westeuropa. Tagung und Workshop zum 200. Jahrestag des Abschlusses des Wiener Kongresses (in press)

Abstract Konferenz 200 Jahre Wiener Kongress Martin Uhrmacher Neue Staaten – neue Grenzen. Die Großregion zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress ... [more ▼]

Abstract Konferenz 200 Jahre Wiener Kongress Martin Uhrmacher Neue Staaten – neue Grenzen. Die Großregion zwischen den Grenzbereinigungen des Ancien Régime und der Neuordnung durch den Wiener Kongress (1779 – 1816). Der Vortrag untersucht die Veränderung von Grenzen und Ihre Entwicklung von sich teils überlagernden und durch Enklaven und Gemeinsherrschaften durchsetzten historisch gewachsenen Grenzsäumen hin zu begradigten, fest definierten und teils naturräumlichen Scheidelinien folgenden Staatsgrenzen. In der heutigen Großregion vollzog sich dieser fundamentale Wandel in nur drei Jahrzehnten: Er gliederte die Region vollkommen neu. Zunächst waren es 1779 mit dem Brüsseler Vertrag nach jahrzehntelangen Verhandlungen endlich zu einem Ausgleich zwischen Österreich und Frankreich gekommen, der die Grenzstreitigkeiten beseitigte und neue, begradigte Grenzen exakt festlegte. Ein ähnlicher Vertrag wurde auch zwischen Österreich und Kurtrier abgeschlossen. Doch die als endgültig geplanten Regelungen bestanden nur wenige Jahre: Infolge der französischen Revolution annektierte die französische Republik am 1. Oktober 1795 die österreichischen Niederlande mit dem Herzogtum Luxemburg und kurz darauf auch Kurtrier und die anderen linksrheinischen Territorien. Alle Staaten wurden aufgelöst und gehörten nun zum französischen Staatsgebiet; Teile der alten Grenzen bestanden als Départementsgrenzen weiter. Nach der Absetzung Napoleons beschloss der Wiener Kongress 1815 eine Neuordnung Europas. Doch im Maas-Moselraum blieben mit Ausnahme Frankreichs alle Territorien und Landesherrschaften, die hier seit dem Früh- und Hochmittelalter bestanden hatten verschwunden. Sie wurden ersetzt durch das neu gegründete Großherzogtum Luxemburg und das ebenfalls neu gegründete Königreich der Vereinigten Niederlande sowie durch die preußische Rheinprovinz, die den gesamten östlichen Teil umfasste. Bei der territorialen Neugliederung griff man in Teilen auf die bis 1795 bestehenden Grenzen des alten Herzogtums zurück. In der Schlussakte des Wiener Kongresses behandeln die Artikel 66 bis 69 das Großherzogtum Luxemburg. Hier werden die Grenzen des neuen Staates allerdings nur grob umrissen; detaillierte Regelungen blieben späteren Verträgen vorbehalten. Unstrittig war die Süd- und Westgrenze mit Frankreich; sie entsprach der 1769/79 festgesetzten und bis 1795 gültigen Linie mit Ausnahme des ehemaligen Herzogtums Bouillon als Zugewinn. Vollkommen neu festgelegt wurde jedoch die Ostgrenze: Mit der Schlussakte des Wiener Kongresses waren alle hier an Luxemburg angrenzenden Gebiete an das Königreich Preußen gefallen. In den Verträgen von Aachen (26. Juni 1816) und Kleve (7. Oktober 1816) einigten sich die niederländische und die preußische Seite darauf, dass die Flussläufe von Mosel, Sauer und Our zukünftig die gemeinsame Grenze bildeten. Hier offenbart sich ein grundlegender Wandel im Verständnis und der Genese von Grenzen: Bisher waren territoriale Veränderungen auf Grundlage historisch gewachsener Herrschaftsstrukturen vorgenommen worden. So konnten kleinere Herrschaften aber auch größere Gebietskonglomerate zwar durch Tausch, Verkauf, Abtretung oder - wie durch Frankreich praktiziert - als „Reunionen“ die territoriale Zugehörigkeit wechseln. Dabei wurden jedoch die historisch gewachsenen Grenzen beachtet, sogar noch bei der Einrichtung der französischen Départements 1795. Mit der Wahl des Flußverlaufs von Sauer und Our als Grenze zwischen Luxemburg und Preußen wurde dieses Prinzip durchbrochen und ein naturräumliches Gliederungselement als neu geschaffene Grenze gewählt. [less ▲]

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See detailNo Random, No Ransom: A Key to Stop Cryptographic Ransomware
Genç, Ziya Alper UL; Lenzini, Gabriele UL; Ryan, Peter UL

in Proceedings of the 15th International Conference on Detection of Intrusions and Malware, and Vulnerability Assessment (DIMVA 2018) (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 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 detailService Performance Pattern Analysis and Prediction of Commercially Available Cloud Providers
Wagle, Shyam Sharan UL; Guzek, Mateusz UL; Bouvry, Pascal UL

in Service Performance Pattern Analysis and Prediction of Commercially Available Cloud Providers (in press)

The knowledge of service performance of cloud providers is essential for cloud service users to choose the cloud services that meet their requirements. Instantaneous performance readings are accessible ... [more ▼]

The knowledge of service performance of cloud providers is essential for cloud service users to choose the cloud services that meet their requirements. Instantaneous performance readings are accessible, but prolonged observations provide more reliable information. However, due to technical complexities and costs of monitoring services, it may not be possible to access the service performance of cloud provider for longer time durations. The extended observation periods are also a necessity for prediction of future behavior of services. These predictions have very high value for decision making both for private and corporate cloud users, as the uncertainty about the future performance of purchased cloud services is an important risk factor. Predictions can be used by specialized entities, such as cloud service brokers (CSBs) to optimally recommend cloud services to the cloud users. In this paper, we address the challenge of prediction. To achieve this, the current service performance patterns of cloud providers are analyzed and future performance of cloud providers are predicted using to the observed service performance data. It is done using two automatic predicting approaches: ARIMA and ETS. Error measures of entire service performance prediction of cloud providers are evaluated against the actual performance of the cloud providers computed over a period of one month. Results obtained in the performance prediction show that the methodology is applicable for both short- term and long-term performance prediction. [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 detailStatic load deflection experiment on a beam for damage detection using the Deformation Area Difference Method
Erdenebat, Dolgion UL; Waldmann, Danièle UL; Teferle, Felix Norman UL

Scientific Conference (in press)

A reliable and safety infrastructure for both transport and traffic is becoming increasingly important today. The condition assessment of bridges remains difficult and new methods must be found to provide ... [more ▼]

A reliable and safety infrastructure for both transport and traffic is becoming increasingly important today. The condition assessment of bridges remains difficult and new methods must be found to provide reliable information. A meaningful in-situ assessment of bridges requires very detailed investigations which cannot be guaranteed by commonly used methods. It is known that the structural response to external loading is influenced by local damages. However, the detection of local damage depends on many factors such as environmental effects (e.g. temperature), construction layer (e.g. asphalt) and accuracy of the structural response measurement. Within the paper, a new so-called Deformation Area Difference (DAD) Method is presented. The DAD method is based on a load deflection experiment and does not require a reference measurement of initial condition. Therefore, the DAD method can be applied on existing bridges. Moreover, the DAD method uses the most modern technologies such as high precision measurement techniques and attempts to combine digital photogrammetry with drone applications. The DAD method uses information given in the curvature course from a theoretical model of the structure and compares it to real measurements. The paper shows results from a laboratory load-deflection experiment with a steel beam which has been gradually damaged at distinct positions. The load size is chosen so that the maximum deflection does not exceed the serviceability limit state. With the data obtained by the laboratory experiment, the damage degree, which can still be detected by the DAD method, is described. Furthermore, the influence of measurement accuracy on damage detection is discussed. [less ▲]

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See detailKommunale Selbstinszenierung im vorstädtischen Raum. Ein neuer Blick auf Leprosorien des Spätmittelalters und der frühen Neuzeit
Uhrmacher, Martin UL

in Hesse, Christian; Schulte, Daniela; Stercken, Martina (Eds.) Kommunale Selbstinszenierung (in press)

Abstract zur Tagung „Kommunale Selbstinszenierung“ der Internationalen Kommission für Stadtgeschichte, des Schweizerischen Arbeitskreises für Stadtgeschichte und des NCCR 'Mediality. Historical ... [more ▼]

Abstract zur Tagung „Kommunale Selbstinszenierung“ der Internationalen Kommission für Stadtgeschichte, des Schweizerischen Arbeitskreises für Stadtgeschichte und des NCCR 'Mediality. Historical Perspectives' Universität Zürich, 3./4./5. September 2015 Martin Uhrmacher (Universität Luxemburg) „Leprosorien als kommunale Repräsentationsbauten im vorstädtischen Raum. Ein neuer Blick auf eine bisher wenig beachtete städtische Baugattung“ Die vor den Mauern mittelalterlicher und frühneuzeitlicher Städte gelegenen Leprosorien werden heute zumeist noch immer als abgelegene und verborgene Orte der Exklusion angesehen, durch Zäune und Mauern von der Außenwelt getrennt. Dementsprechend wird auch der Baugattung „Leprosorium“ nur wenig architektonischer Wert zugebilligt, wie bspw. im Ausstellungskatalog „Aussatz – Lepra – Hansen-Krankheit: Demnach hatten sie „keinerlei repräsentative Bedeutung, im Gegenteil: eher unauffällig sollten sie sein, verborgen vor dem Blick der Stadtbewohner und Reisenden“. Im 2005 von Monika Escher und Frank G. Hirschmann publizierten Syntheseband „Die urbanen Zentren des hohen und späten Mittelalters“ zur Geschichte mittelalterlicher Städte zwischen Rhein und Maas werden Leprosorien zudem als „nicht wertungsrelevantes“ Urbanitäts- und Zentralitätskriterium“ bezeichnet; begründet mit der angeblichen „Tatsache, daß in der Regel der topographische Bezug zur Stadt gering war“. In der jüngeren Forschung hat sich diese Einschätzung nun grundlegend gewandelt. Leprosorien gelten aufgrund ihrer besonders prominent und exponiert ausgewählten Standorte an Kreuzungen, Brücken und Hauptausfallstraßen als präsente und das städtische Umland prägende kommunale Einrichtungen, die ein fester Bestandteil der städtischen Lebenswelt waren. Sie dienten nicht dazu, ihre Bewohner zu verstecken, sondern waren vielmehr mit Stiftungen und Spenden versehene städtische Einrichtungen, die vom Rat und den Bürgern auch als Prestigeobjekte betrachtet wurden. Anhand ausgewählter Beispiele wird aufgezeigt, wie Leprosorien als Repräsentationsobjekte der Stadtgemeinden auch dem bürgerlichen Selbstverständnis Ausdruck verliehen. [less ▲]

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See detailO-MI/O-DF vs. MQTT: a performance analysis
Benedick, Paul-Lou UL; Robert, Jérémy UL; Le Traon, Yves UL et al

in O-MI/O-DF vs. MQTT: a performance analysis (in press)

Over the past decade, a flourishing number of concepts and architectural shifts appeared such as Industrial Internet of Things (IIoT), Industrial CPS or even Industry 4.0. Unfortunately, today’s IoT as ... [more ▼]

Over the past decade, a flourishing number of concepts and architectural shifts appeared such as Industrial Internet of Things (IIoT), Industrial CPS or even Industry 4.0. Unfortunately, today’s IoT as well as Industry 4.0 environments, look more like a collection of isolated “Intranets of Things”, also referred to as “vertical silos”, rather than a federated infrastructure. Breaking down these silos is a key challenge in both the IoT and Industry 4.0 communities. This paper is intended to present and discuss two open and standardised mes- saging protocols designed for IoT applications, namely: MQTT and O-MI/O-DF. First, a traffic load’s analytical model derived from the MQTT standard specifications is presented. Second, a comparison study between MQTT and O-MI/O-DF standards is carried out based on a real-life industrial implementation. This study brings a deep understanding of the extent to which these protocols are performant (from a traffic load perspective) and how they can impact on future architectural designs. [less ▲]

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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 detailNew Directions in Attack Tree Research: Catching up with Industrial Needs
Gadyatskaya, Olga UL; Trujillo Rasua, Rolando UL

in Mauw, Sjouke (Ed.) Proceedings of the 4th International Workshop on Graphical Models for Security (in press)

Attack trees provide a systematic way of characterizing diverse system threats. Their strengths arise from the combination of an intuitive representation of possible attacks and availability of formal ... [more ▼]

Attack trees provide a systematic way of characterizing diverse system threats. Their strengths arise from the combination of an intuitive representation of possible attacks and availability of formal mathematical frameworks for analyzing them in a qualitative or a quantitative manner. Indeed, the mathematical frameworks have become a large focus of attack tree research. However, practical applications of attack trees in industry largely remain a tedious and error-prone exercise. Recent research directions in attack trees, such as attack tree generation, attempt to close this gap and to improve the attack tree state-of-thepractice. In this position paper we outline the recurrent challenges in manual tree design within industry, and we overview the recent research results in attack trees that help the practitioners. For the challenges that have not yet been addressed by the community, we propose new promising research directions. [less ▲]

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See detailFundamental rights and constitutional identity(ies): limits or parameters of the EU constitutional governance?
Zinonos, Panagiotis UL

in European Governance and Sovereignty (in press)

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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 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 detailThe competence to conclude the new generation of free trade agreements: lessons from Opinion 2/15
Neframi, Eleftheria UL

in Chaisse, Julien (Ed.) China-European Union Investment Relationships (in press)

Opinion 2/15 addresses the question of the external competence of the EU to conclude a free trade agreement with Singapore (EUSFTA). The nature of the EU’s competence determines the conclusion of an EU ... [more ▼]

Opinion 2/15 addresses the question of the external competence of the EU to conclude a free trade agreement with Singapore (EUSFTA). The nature of the EU’s competence determines the conclusion of an EU-only agreement, or a mixed agreement, jointly by the Union and its Member States. The Court of Justice of the European Union held that the EU competence to conclude the EUSFTA is not exclusive, as long as provisions concerning non-direct investments and dispute settlement fall under the shared competence of the Union and its Member States. The Court of Justice made valuable contributions to the interpretation of the scope of the Union’s competence in the field of common commercial policy, comprising sustainable development provisions, as well as to the interpretation of implied external competences, and clarified the status of non-substantive provisions. However, uncertainty remains as far as the meaning and the impact of a shared competence are concerned. [less ▲]

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See detailAre octroyed constitutions of the 19th century to be considered as 'imposed constitutions'?
Gerkrath, Jörg UL

in Contiades, Xenophon; Albert, Richard; Fotiadou, Alkmene (Eds.) The Law and Legitimacy of Imposed Constitutions (2018, November)

The paper considers ‘octroyed’, ‘conceded’ or ‘granted’ constitutions of 19th century Europe whose common roots are to be found in the French ‘Charte constitutionnelle’ of 1814. These Charters stem from a ... [more ▼]

The paper considers ‘octroyed’, ‘conceded’ or ‘granted’ constitutions of 19th century Europe whose common roots are to be found in the French ‘Charte constitutionnelle’ of 1814. These Charters stem from a paternalistic process of domestic constitution-making engaged unilaterally by a monarch possessing the de facto constituent power and exercising it without the direct involvement of a body representing the people. Such octroyed constitutions, which are of course to be opposed to democratically established ones, show nevertheless a number of specific characteristics which distinguish them also from ‘imposed constitutions’ in the usual sense. The expression ‘constitutional octroy’ should not be used as a synonym for any process leading to an ‘imposed Constitution’. The contribution aims to develop and to validate or invalidate the value of a series of distinctive criteria and possible elements of a definition of ‘octroyed’ or ‘granted’ constitutions in order to underline their specificity. [less ▲]

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See detailHITECS: A UML Profile and Analysis Framework for Hardware-in-the-Loop Testing of Cyber Physical Systems
Shin, Seung Yeob UL; Chaouch, Karim UL; Nejati, Shiva UL et al

in Proceedings of ACM/IEEE 21st International Conference on Model Driven Engineering Languages and Systems (MODELS’18) (2018, October)

Hardware-in-the-loop (HiL) testing is an important step in the development of cyber physical systems (CPS). CPS HiL test cases manipulate hardware components, are time-consuming and their behaviors are ... [more ▼]

Hardware-in-the-loop (HiL) testing is an important step in the development of cyber physical systems (CPS). CPS HiL test cases manipulate hardware components, are time-consuming and their behaviors are impacted by the uncertainties in the CPS environment. To mitigate the risks associated with HiL testing, engineers have to ensure that (1) HiL test cases are well-behaved, i.e., they implement valid test scenarios and do not accidentally damage hardware, and (2) HiL test cases can execute within the time budget allotted to HiL testing. This paper proposes an approach to help engineers systematically specify and analyze CPS HiL test cases. Leveraging the UML profile mechanism, we develop an executable domain-specific language, HITECS, for HiL test case specification. HITECS builds on the UML Testing Profile (UTP) and the UML action language (Alf). Using HITECS, we provide analysis methods to check whether HiL test cases are well-behaved, and to estimate the execution times of these test cases before the actual HiL testing stage. We apply HITECS to an industrial case study from the satellite domain. Our results show that: (1) HITECS is feasible to use in practice; (2) HITECS helps engineers define more complete and effective well-behavedness assertions for HiL test cases, compared to when these assertions are defined without systematic guidance; (3) HITECS verifies in practical time that HiL test cases are well-behaved; and (4) HITECS accurately estimates HiL test case execution times. [less ▲]

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See detailEnabling Model Testing of Cyber-Physical Systems
Gonzalez Perez, Carlos Alberto UL; Varmazyar, Mojtaba UL; Nejati, Shiva UL et al

in Proceedings of ACM/IEEE 21st International Conference on Model Driven Engineering Languages and Systems (MODELS’18) (2018, October)

Applying traditional testing techniques to Cyber-Physical Systems (CPS) is challenging due to the deep intertwining of software and hardware, and the complex, continuous interactions between the system ... [more ▼]

Applying traditional testing techniques to Cyber-Physical Systems (CPS) is challenging due to the deep intertwining of software and hardware, and the complex, continuous interactions between the system and its environment. To alleviate these challenges we propose to conduct testing at early stages and over executable models of the system and its environment. Model testing of CPSs is however not without difficulties. The complexity and heterogeneity of CPSs renders necessary the combination of different modeling formalisms to build faithful models of their different components. The execution of CPS models thus requires an execution framework supporting the co-simulation of different types of models, including models of the software (e.g., SysML), hardware (e.g., SysML or Simulink), and physical environment (e.g., Simulink). Furthermore, to enable testing in realistic conditions, the co-simulation process must be (1) fast, so that thousands of simulations can be conducted in practical time, (2) controllable, to precisely emulate the expected runtime behavior of the system and, (3) observable, by producing simulation data enabling the detection of failures. To tackle these challenges, we propose a SysML-based modeling methodology for model testing of CPSs, and an efficient SysML-Simulink co-simulation framework. Our approach was validated on a case study from the satellite domain. [less ▲]

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See detailTUNA: TUning Naturalness-based Analysis
Jimenez, Matthieu UL; Cordy, Maxime UL; Le Traon, Yves UL et al

in 34th IEEE International Conference on Software Maintenance and Evolution, Madrid, Spain, 26-28 September 2018 (2018, September 26)

Natural language processing techniques, in particular n-gram models, have been applied successfully to facilitate a number of software engineering tasks. However, in our related ICSME ’18 paper, we have ... [more ▼]

Natural language processing techniques, in particular n-gram models, have been applied successfully to facilitate a number of software engineering tasks. However, in our related ICSME ’18 paper, we have shown that the conclusions of a study can drastically change with respect to how the code is tokenized and how the used n-gram model is parameterized. These choices are thus of utmost importance, and one must carefully make them. To show this and allow the community to benefit from our work, we have developed TUNA (TUning Naturalness-based Analysis), a Java software artifact to perform naturalness-based analyses of source code. To the best of our knowledge, TUNA is the first open- source, end-to-end toolchain to carry out source code analyses based on naturalness. [less ▲]

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See detailOn the impact of tokenizer and parameters on N-gram based Code Analysis
Jimenez, Matthieu UL; Cordy, Maxime UL; Le Traon, Yves UL et al

Scientific Conference (2018, September)

Recent research shows that language models, such as n-gram models, are useful at a wide variety of software engineering tasks, e.g., code completion, bug identification, code summarisation, etc. However ... [more ▼]

Recent research shows that language models, such as n-gram models, are useful at a wide variety of software engineering tasks, e.g., code completion, bug identification, code summarisation, etc. However, such models require the appropriate set of numerous parameters. Moreover, the different ways one can read code essentially yield different models (based on the different sequences of tokens). In this paper, we focus on n- gram models and evaluate how the use of tokenizers, smoothing, unknown threshold and n values impact the predicting ability of these models. Thus, we compare the use of multiple tokenizers and sets of different parameters (smoothing, unknown threshold and n values) with the aim of identifying the most appropriate combinations. Our results show that the Modified Kneser-Ney smoothing technique performs best, while n values are depended on the choice of the tokenizer, with values 4 or 5 offering a good trade-off between entropy and computation time. Interestingly, we find that tokenizers treating the code as simple text are the most robust ones. Finally, we demonstrate that the differences between the tokenizers are of practical importance and have the potential of changing the conclusions of a given experiment. [less ▲]

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See detailParallel and hybrid soft-thresholding algorithms with line search for sparse nonlinear regression
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

in Proc. 26th European Signal Processing Conference (2018, September)

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See detailA Contribution to Cyber-Physical Systems Security: an Event-based Attack-tolerant Control Approach
Bezzaoucha, Souad UL; Voos, Holger UL

in Proceedings of 10th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2018 (2018, August 29)

In the present paper, a model-based fault/attack tolerant scheme is proposed to deal with cyber-threats on Cyber Physicals Systems. A common scheme based on observers is designed and a state feedback ... [more ▼]

In the present paper, a model-based fault/attack tolerant scheme is proposed to deal with cyber-threats on Cyber Physicals Systems. A common scheme based on observers is designed and a state feedback control based on an event-triggered framework is given with control synthesis and condition on the switching time. An event-based implementation is proposed in order to achieve novel security strategy. Observer and controller gains are deduced by solving su cient Bilinear Matrix Inequality (BMI) condition. Simulation results on a real-time laboratory three tank system are given to show the attack-tolerant control ability despite data deception attacks on both actuators and sensors. [less ▲]

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See detailTapping the Potential of Diverse Founding Teams for Firm Growth: The Role of New Venture Activities
Tryba, Anne UL; Patzelt, Holger; Breugst, Nicola

Scientific Conference (2018, August)

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See detailResource Allocation and Relay Selection for Multi-User OFDM-Based Cooperative Networks with SWIPT
Gautam, Sumit UL; Lagunas, Eva UL; Chatzinotas, Symeon UL et al

Scientific Conference (2018, August)

In this paper, we investigate resource allocation and relay selection in a two-hop relay-assisted multi-user network, where the end users support Simultaneous Wireless Information and Power Transfer ... [more ▼]

In this paper, we investigate resource allocation and relay selection in a two-hop relay-assisted multi-user network, where the end users support Simultaneous Wireless Information and Power Transfer (SWIPT). In particular, we consider single source assisted by a set of spatially distributed relays able to amplify-and-forward orthogonal frequency division multiplexing (OFDM) signals carrying both data and power at the same time. The users are assumed to implement a power splitting technique where the received signal is orthogonally split in two streams of different power levels, where one signal stream is sent to the power harvesting module while the other is converted to baseband for information decoding. We aim at optimizing the users’ power splitting ratios as well as the relay, carrier and power assignment so that the end-users’ sum-rate is maximized subject to transmitted and harvested power constraints. Such joint optimization is combinatorial in nature with a non-convex structure. Therefore, we present a sub-optimal low complex solution based on the harmonic mean of the two-hop relay channel coefficients. Simulation results reveal that the proposed algorithm provides significant performance gains in comparison with a semi-random resource allocation and relay selection approach. [less ▲]

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See detailConclusions générales: La Cour Constitutionnelle en tant qu'autorité de dialogue
Gerkrath, Jörg UL

in Gerkrath, Jörg (Ed.) Les 20 ans de la Cour Constitutionnelle: Trop jeune pour mourir? (2018, July 17)

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See detailThe Reasons of Older people for the Use or Non-use of Assistive Technologies:
A Systematic Review of Qualitative Studies
Abrilahij, Afsaneh UL; Boll, Thomas UL

Scientific Conference (2018, July 06)

The baby boomer generation is aging and the proportion of older people in the population is increasing. While people age, functional, cognitive, and physical problems increase. Assistive technology (AT ... [more ▼]

The baby boomer generation is aging and the proportion of older people in the population is increasing. While people age, functional, cognitive, and physical problems increase. Assistive technology (AT) can help to overcome some activity limitations relevant to aging. Although ATs have potential benefits (e.g., to reduce the burden of caregivers, to increase independence), their usage rate is still low. Whereas several reviews of quantitative studies on factors of ATs use already exist, a systematic review of qualitative research about AT use is still missing. The aim of the current review is to provide more differentiated answers about what makes some older people use ATs while others not. Based on systematic literature searches in PsycINFO, MEDLINE, and Google Scholar databases 18 relevant papers were identified according to our selection criteria. These studies were based on to self-reported reasons of older people for using or not-using diverse types of ATs designed for many different activities. We classified the key reasons as referring to three aspects: attributes of “potential technology users”, “context”, and “technology”. Perceived usefulness and attitudes towards use were the most common “personal” reasons and social impact by significant others was the most common “contextual” reason, and technology design was the most common “technological” reason influencing use or non-use of ATs. We discussed the identified reasons in relation to the major models of developmental self-regulation and action-theoretical approaches to development in age. Based on the current review, we generated methodological and theoretical recommendations for future research and for practical applications. [less ▲]

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See detailComparative Evaluation of Models of Assistive Technologies’ Use
Abrilahij, Afsaneh UL; Boll, Thomas UL

Scientific Conference (2018, July 06)

Many older people have functional limitations and are at risk of losing their ability to live autonomously. Assistive Technology (AT) could help to reduce that risk. However, many older people don’t use ... [more ▼]

Many older people have functional limitations and are at risk of losing their ability to live autonomously. Assistive Technology (AT) could help to reduce that risk. However, many older people don’t use ATs. Our presentation reviews existing models of ATs use, their applicability to specific types of AT, predictive value, fundamental elements, and critiques of such models. In systematic literature searches in PsycINFO, MEDLINE, and Google Scholar 46 papers were identified that met our inclusion criteria. 32 papers covered models of ATs use, applicability to special types of ATs, components of models, and their predictive value. 14 papers cover criticisms of models of AT use. We classified the models into two groups: The first included 11 models focusing on individuals’ mental states (e.g., beliefs, desires) as factors explaining ATs use; the second included 22 models that also considered contextual factors (e.g., social influence, physical environment) in addition to individuals’ mental states. Across both groups the most frequently included explanatory components were subjective norm and personal attitudes towards AT use, followed by perceived usefulness, perceived ease of use and then intention to use. Models were most frequently applied to information technologies followed by application to socially assistive robots. Unified Theory of Acceptance and Use of Technology 2 (UTAUT2) and an extended version of Technology Acceptance Model showed the highest amount of explained variance in intention to use (56-74%) and an extended model of UTAUT in actual use of ATs (64%). We conclude with recommendations for further improvement of AT use models. [less ▲]

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See detailAn n-ary generalization of the concept of distance
Kiss, Gergely; Marichal, Jean-Luc UL; Teheux, Bruno UL

Scientific Conference (2018, July 03)

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See detailThe Multicultural Ideology Scale (MIS): Factor Structure and Measurement Invariance
Stogianni, Maria UL; Murdock, Elke UL

Scientific Conference (2018, July 02)

The concept of multiculturalism has been widely used in cross-cultural research to describe positive attitudes towards a culturally plural society and practices that support cultural diversity. To date ... [more ▼]

The concept of multiculturalism has been widely used in cross-cultural research to describe positive attitudes towards a culturally plural society and practices that support cultural diversity. To date, attitudes towards multiculturalism among majority and minority group members have been assessed with the same instruments. However, there is little psychometric evidence that these measures operate appropriately in various cultural contexts. The purpose of the present study was to investigate the factor structure of the Multicultural Ideology Scale (MIS; Berry & Kalin, 1995) and test its measurement invariance across different language versions and ethnic groups. The entire sample consisted of 1572 adolescents and adults in Luxembourg, including native majority members (N = 693) and immigrants from diverse ethnic backgrounds (N = 879). Participants were given the option to complete the questionnaire in one of the following languages: English, German or French. The unidimensional model of multicultural ideology did not show an acceptable fit of the data across all language versions of the MIS. Exploratory and confirmatory factorial analyses revealed a two-factor structure, which was partially invariant across two different language versions (English and German). The two factors reflected positive and negative attitudes towards cultural diversity respectively. Subsequent multigroup confirmatory factor analyses supported configural and metric invariance across majority and minority group members. Scalar invariance was not established, indicating that respondents across these two groups conceptualize multiculturalism in different ways. Implications of these findings are discussed together with methodological issues concerning the assessment of measurement invariance. [less ▲]

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See detailApprentissage formel, non-formel et informel de musique dans la communauté. Comment correspondent-ils
Sagrillo, Damien UL

Scientific Conference (2018, July 02)

Tandis que le concept de l’apprentissage formel, non-formel et informel est supposé connu en ce qui concerne ses orientations générales, il en est moins pour la pédagogie musicale. Sa vue sous différents ... [more ▼]

Tandis que le concept de l’apprentissage formel, non-formel et informel est supposé connu en ce qui concerne ses orientations générales, il en est moins pour la pédagogie musicale. Sa vue sous différents angles, notamment sous l’optique de la musique pour amateurs, fera l’objet de ma communication. De l'autre côté, le concept de musique dans la communauté est emprunté de l’anglais « community music ». Celui-ci signifie que la pratique des amateurs de musique est fondée sur des activités de loisir. Mais il existe bien d’autres volets qui pourraient être regroupés sous la perspective d’une musique dans ou par la communauté. D’abord il semble qu’il est totalement dissocié des méthodes traditionnelles d’apprentissage musical de nature formelle ou non-formelle. Mais il serait plutôt lié à une éducation de nature informelle qui, cependant, ne peut pas être mise en relation avec l’autodidactie. Des approches récentes la voient en rapport avec l’inclusion et la participation réalisée dans un milieu associatif et comme moyen de surmonter l’obstacle qui existe entre la pédagogie musicale traditionnelle et les exigences de la communauté musicale. De l’autre côté, la musique dans la communauté se présente comme un contre-projet face à la haute culture musicale professionnalisée (Lichtinger 2013). En ce qui concerne le terme de « community music », il n’existe pas de traduction littérale française. Cependant, il est parfaitement approprié de retracer le processus d’une éducation musicale des jeunes qui commence souvent par une phase amateur pour mener par après à la vie professionnelle pour les plus doués, soit pour décrire la formation et la vie musicale des jeunes amateurs, soit pour retracer la vie de musicien amateur tout au long de la vie de ces musicophiles. Dans ma communication, je présenterai des définitions pour chacun des trois aspects de formation musicale n’ignorant pas que surtout pour l’éducation musicale de type non-formel il n’existe pas de consensus. Ensuite, je mettrai en relation les deux concepts – i.e. celui des trois aspects de formation musicale et celui de la musique dans la communauté – en donnant des exemples d’une pratique musicale très répandue, à savoir la musique à vent (et/ou chant choral) pour enfin comparer des modèles d’apprentissage musical tels qu’ils existent et sont appliqués dans différents pays européens liés à cette tradition. [less ▲]

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See detailOn associative, idempotent, symmetric, and nondecreasing operations
Devillet, Jimmy UL; Teheux, Bruno UL

Scientific Conference (2018, July 02)

see attached file

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See detailAssociative and quasitrivial operations on finite sets: characterizations and enumeration
Couceiro, Miguel; Devillet, Jimmy UL; Marichal, Jean-Luc UL

Scientific Conference (2018, July 02)

We investigate the class of binary associative and quasitrivial operations on a given finite set. Here the quasitriviality property (also known as conservativeness) means that the operation always outputs ... [more ▼]

We investigate the class of binary associative and quasitrivial operations on a given finite set. Here the quasitriviality property (also known as conservativeness) means that the operation always outputs one of its input values. We also examine the special situations where the operations are commutative and nondecreasing, in which cases the operations reduce to discrete uninorms (which are discrete fuzzy connectives playing an important role in fuzzy logic). Interestingly, associative and quasitrivial operations that are nondecreasing are characterized in terms of total and weak orderings through the so-called single-peakedness property introduced in social choice theory by Duncan Black. We also address and solve a number of enumeration issues: we count the number of binary associative and quasitrivial operations on a given finite set as well as the number of those operations that are commutative and/or nondecreasing. [less ▲]

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See detailIntroducing MaFIN. A dynamic matrices finite state automata test
Kunze, Thiemo UL; Krieger, Florian UL; Stadler, Matthias UL et al

Scientific Conference (2018, July)

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See detailPeut-on se moquer de tout ? L'étendue de la liberté d'expression face au sentiment religieux
Gerkrath, Jörg UL

in Institut Grand Ducal (Ed.) Actes de la Section des sciences morales et politiques (2018, July)

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See detailSuccessive convex approximation algorithms for sparse signal estimation with nonconvex regularizations
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

in Proc. The 10th IEEE Sensor Array and Multichannel Signal Processing Workshop (2018, July)

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See detailToward a new model of collaborative problem solving definition and assessment
Stoeffler, K.; Greiff, Samuel UL; Von Davier, A. et al

Scientific Conference (2018, July)

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See detailTowards a multifaceted framework of complex problem solving
Stadler, Matthias UL; Niepel, Christoph UL; Greiff, Samuel UL

Scientific Conference (2018, July)

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See detailTest Case Prioritization for Acceptance Testing of Cyber Physical Systems: A Multi-Objective Search-Based Approach
Shin, Seung Yeob UL; Nejati, Shiva UL; Sabetzadeh, Mehrdad UL et al

in Proceedings of the ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA'18) (2018, July)

Acceptance testing validates that a system meets its requirements and determines whether it can be sufficiently trusted and put into operation. For cyber physical systems (CPS), acceptance testing is a ... [more ▼]

Acceptance testing validates that a system meets its requirements and determines whether it can be sufficiently trusted and put into operation. For cyber physical systems (CPS), acceptance testing is a hardware-in-the-loop process conducted in a (near-)operational environment. Acceptance testing of a CPS often necessitates that the test cases be prioritized, as there are usually too many scenarios to consider given time constraints. CPS acceptance testing is further complicated by the uncertainty in the environment and the impact of testing on hardware. We propose an automated test case prioritization approach for CPS acceptance testing, accounting for time budget constraints, uncertainty, and hardware damage risks. Our approach is based on multi-objective search, combined with a test case minimization algorithm that eliminates redundant operations from an ordered sequence of test cases. We evaluate our approach on a representative case study from the satellite domain. The results indicate that, compared to test cases that are prioritized manually by satellite engineers, our automated approach more than doubles the number of test cases that fit into a given time frame, while reducing to less than one third the number of operations that entail the risk of damage to key hardware components. [less ▲]

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See detailGenerating Multi-Categorical Samples with Generative Adversarial Networks
Camino, Ramiro Daniel UL; Hammerschmidt, Christian UL; State, Radu UL

Scientific Conference (2018, July)

We propose a method to train generative adversarial networks on mutivariate feature vectors representing multiple categorical values. In contrast to the continuous domain, where GAN-based methods have ... [more ▼]

We propose a method to train generative adversarial networks on mutivariate feature vectors representing multiple categorical values. In contrast to the continuous domain, where GAN-based methods have delivered considerable results, GANs struggle to perform equally well on discrete data. We propose and compare several architectures based on multiple (Gumbel) softmax output layers taking into account the structure of the data. We evaluate the performance of our architecture on datasets with different sparsity, number of features, ranges of categorical values, and dependencies among the features. Our proposed architecture and method outperforms existing models. [less ▲]

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See detailCyber Security and Vulnerability Analysis of Networked Control System subject to False-Data injection
Gerard, Benjamin; Bezzaoucha, Souad UL; Voos, Holger UL et al

in Proceedings of the 2018 American Control Conference (2018, June 27)

In the present paper, the problem of networked control system (NCS) cyber security is considered. The geometric approach is used to evaluate the security and vulnerability level of the controlled system ... [more ▼]

In the present paper, the problem of networked control system (NCS) cyber security is considered. The geometric approach is used to evaluate the security and vulnerability level of the controlled system. The proposed results are about the so-called false data injection attacks and show how imperfectly known disturbances can be used to perform undetectable, or at least stealthy, attacks that can make the NCS vulnerable to attacks from malicious outsiders. A numerical example is given to illustrate the approach. [less ▲]

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See detailA Decoupling Approach to Design Observers for Polytopic Takagi-Sugeno Models Subject to Unknown Inputs
Bezzaoucha, Souad UL; Voos, Holger UL; Davila, Jorge et al

in Proceedings of the 2018 American Control Conference (2018, June 27)

A decoupling approach for state estimation of nonlinear systems represented in the polytopic Takagi-Sugeno with unmeasurable premise variables subject to unknown inputs is proposed in this paper. The idea ... [more ▼]

A decoupling approach for state estimation of nonlinear systems represented in the polytopic Takagi-Sugeno with unmeasurable premise variables subject to unknown inputs is proposed in this paper. The idea consists in defining a state and unknown input transformations in order to divide the state vector into two parts, a measurable part and an observable one (decoupled from the unknown input). A classical Luenberger observer to estimate the unmeasurable part is then designed and given in terms of Linear Matrix Inequalities (LMIs) conditions. A numerical example is also presented in order to illustrate the proposed approach. [less ▲]

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See detailKommentar zu DIN EN 1994-1-1, Verbundtragwerke aus Stahl und BEton
Schäfer, Markus UL; Hanswile, Gerhard

Scientific Conference (2018, June 22)

Design of Composite Structures in steel and concrete according to EN 1994-1-1, presentation of special requirements and boundary conditions for the design of composite beams and columns.

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See detailEmergent Multilinguals Learning Languages with the iPad app iTEO
Aleksic, Gabrijela UL; Kirsch, Claudine UL

Scientific Conference (2018, June 22)

This presentation showed the results of a small-scale study led by Ass. Prof. Claudine Kirsch that investigated language learning in primary schools in Luxembourg and the ways in which this process is ... [more ▼]

This presentation showed the results of a small-scale study led by Ass. Prof. Claudine Kirsch that investigated language learning in primary schools in Luxembourg and the ways in which this process is mediated by peers and the iPad app iTEO. This study draws its data from the larger longitudinal qualitative research project iTEO (2013–2017) and is based on 10 hours of audio and video-recordings. The participants were 6–7-year-olds learning German and French. The presentation focused on the ways in which the emergent multilingual primary school children scaffold each other’s learning of French while collaboratively producing oral texts on iTEO. The findings show that the children’s language learning was mediated by peers, the task and the app. The children used a range of learning and teaching strategies while completing tasks framed by their teacher. iTEO and the task together mobilised the children’s resources, encouraged autonomy and promoted discussion about language. The presentation linked the results with the other projects during the COST DigitLitey meeting. For example, the link was made with the work with robots in early childhood education and the use of Cubetto, a robot toy teaching kids code and programming and encouraging collaboration and storytelling. The presentation was followed by a discussion on the use of digital tools in early childhood education settings. Keywords: The iPad app, iTEO, peers, language learning, mediation, primary school Source: Kirsch, C. & Bes Izuel, A. (2016). Emergent multilinguals learning languages with the IPad app iTEO: a study in primary schools in Luxembourg, The Language Learning Journal, 2016. https://doi.org/10.1080/09571736.2016.1258721 This work was funded by the University of Luxembourg under Grant PUL R-AGR-0222; Ministry of National Education, Childhood and Youth under SCRIPT. [less ▲]

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See detailFlachdecken in Verbundbauweise Bemessung und Konstruktion von Slim-Floor-Trägern
Schäfer, Markus UL

Scientific Conference (2018, June 22)

Presentation of basic information for design of slim-floor beams and presentation of executed projects

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See detailOn bisymmetric and quasitrivial operations
Devillet, Jimmy UL

Scientific Conference (2018, June 21)

See attachment

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See detailExploring Multilingual Pedagogies: Forced Migrants’ Learning Experiences in Luxembourg
Kalocsanyiova, Erika UL

Scientific Conference (2018, June 20)

While most societies are structured around diverse flows of people and complex linguistic repertoires, (language) education schemes are still dominated by monolingual instructional practices. This paper ... [more ▼]

While most societies are structured around diverse flows of people and complex linguistic repertoires, (language) education schemes are still dominated by monolingual instructional practices. This paper aims to contribute to current discussions on the affordances of multilingual pedagogies in contexts of forced migration. It draws on a range of linguistic ethnographic data (Copland & Creese, 2015) that was collected over the period of 2016-2017 in diverse settings of language learning and socialization. Our research sites in Luxembourg included language courses in French, English and German, mathematics courses, application and web development training, and diverse leisure activities. Having followed the learning trajectory of five asylum applicants, we explored how they built on their old and newly-acquired language resources. Our findings confirm that in order to make their voices heard, the learners often drew upon elements from multiple languages, including those local languages they had no extensive competence in. This multilingual orientation enabled them to see the local languages as new functional resources in their growing repertoires (Kalocsányiová, 2017). This is of special relevance in contexts of forced migration, where learners need to become users of the languages they are learning from the first day onward. [less ▲]

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See detailHighway Network Block with Gates Constraints for Training Very Deep Networks
Oyedotun, Oyebade UL; Shabayek, Abd El Rahman UL; Aouada, Djamila UL et al

in 2018 IEEE International Conference on Computer Vision and Pattern Recognition Workshop, June 18-22, 2018 (2018, June 19)

In this paper, we propose to reformulate the learning of the highway network block to realize both early optimization and improved generalization of very deep networks while preserving the network depth ... [more ▼]

In this paper, we propose to reformulate the learning of the highway network block to realize both early optimization and improved generalization of very deep networks while preserving the network depth. Gate constraints are duly employed to improve optimization, latent representations and parameterization usage in order to efficiently learn hierarchical feature transformations which are crucial for the success of any deep network. One of the earliest very deep models with over 30 layers that was successfully trained relied on highway network blocks. Although, highway blocks suffice for alleviating optimization problem via improved information flow, we show for the first time that further in training such highway blocks may result into learning mostly untransformed features and therefore a reduction in the effective depth of the model; this could negatively impact model generalization performance. Using the proposed approach, 15-layer and 20-layer models are successfully trained with one gate and a 32-layer model using three gates. This leads to a drastic reduction of model parameters as compared to the original highway network. Extensive experiments on CIFAR-10, CIFAR-100, Fashion-MNIST and USPS datasets are performed to validate the effectiveness of the proposed approach. Particularly, we outperform the original highway network and many state-ofthe- art results. To the best our knowledge, on the Fashion-MNIST and USPS datasets, the achieved results are the best reported in literature. [less ▲]

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See detailPose Encoding for Robust Skeleton-Based Action Recognition
Demisse, Girum UL; Papadopoulos, Konstantinos UL; Aouada, Djamila UL et al

in CVPRW: Visual Understanding of Humans in Crowd Scene, Salt Lake City, Utah, June 18-22, 2018 (2018, June 18)

Some of the main challenges in skeleton-based action recognition systems are redundant and noisy pose transformations. Earlier works in skeleton-based action recognition explored different approaches for ... [more ▼]

Some of the main challenges in skeleton-based action recognition systems are redundant and noisy pose transformations. Earlier works in skeleton-based action recognition explored different approaches for filtering linear noise transformations, but neglect to address potential nonlinear transformations. In this paper, we present an unsupervised learning approach for estimating nonlinear noise transformations in pose estimates. Our approach starts by decoupling linear and nonlinear noise transformations. While the linear transformations are modelled explicitly the nonlinear transformations are learned from data. Subsequently, we use an autoencoder with L2-norm reconstruction error and show that it indeed does capture nonlinear noise transformations, and recover a denoised pose estimate which in turn improves performance significantly. We validate our approach on a publicly available dataset, NW-UCLA. [less ▲]

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See detailThe implementation of Circular Economy policies: A challenge for institutions and practices
Hild, Paula UL

Scientific Conference (2018, June 14)

Since 2014, the Grand Duchy of Luxembourg’s national policy aims at transitioning the national economy from a linear to a circular model. However, we do not know so far how the different socio-economic ... [more ▼]

Since 2014, the Grand Duchy of Luxembourg’s national policy aims at transitioning the national economy from a linear to a circular model. However, we do not know so far how the different socio-economic actors in the country deal with this new political vision. Thus, the overall aim of the CIRCULUX research project is to analyse the effectiveness of the circular economy policy in Luxembourg by studying institutions and practices in businesses. In this way, we follow authors who claim for the systematic inclusion of institutions into the analysis of policy effectiveness (Glückler and Lenz, 2016). We assume that institutions explain sectoral differences in the efficacy of circular economy policies, in analogy to Bathelt and Glückler (2014) who state that in a comparative study, institutions enable to clarify regional differences. Focusing on two different industries, the building sector and the automotive supply industry, we hope to explore the variety of circular economy practices, and therefore as well theoretical and pragmatic implications between the United Nations Sustainable Development Goals 9 (Industry, Innovation, and Infrastructure) and 12 (Responsible Consumption and Production). The research follows a qualitative research approach, including documentary analysis, up to 20 exploratory and around 50 semi-structured expert interviews. We intend to capture different dimensions of the motivations and barriers of companies for shifting towards circularity, by triangulation of these three datasets. In the analysis of data, we consider different levels and emphasise on three points highlighted by various authors for a need for further consideration. The first aspect focus on the socio-cultural specificities of Luxembourg and related challenges for the implementation of a circular economy (e.g., the mix of technical standards, multilingualism, corporate cultures). The second aspect covers the internal dynamics of actor networks and hybrid organisations that aim to bring circular economy theory into practice (Schulz and Preller, 2016). Moreover, the third aspect deals with the articulation between sustainability effectiveness and the cost from the perspectives of various stakeholders (Ruparathna and Hewage, 2015). The preliminary results put forward the interdependence of the actors’ perception of what would mean a circular economy model for Luxembourg. They also reveal the firm’s specific role in this system. The decision of a business actor to implement a circular economy practice depends primarily on its return on investment, the general regulatory pressure and the maturity of the industry and the company. In general, the hindrance for circularity is not the absence of a technological or technical solution. Interviews with experts from the business sector reveal that notably economic factors are hindering circularity in companies. Besides, the maturity of the firm given its awareness for concepts like the circular economy, sustainable development, or sustainability shapes its vision for the future in this field actively. As a push for action, interviewees suggested a regulatory framework for circularity. [less ▲]

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See detailSoftening and melting modeling of iron ore particles using a discrete - continuous coupling method
Baniasadi, Mehdi UL; Baniasadi, Maryam; Peters, Bernhard UL

Scientific Conference (2018, June 13)

The blast furnace iron making is the main method to produce liquid iron. A blast furnace is charged with ore and coke from the top along with a preheated gas introduced to the furnace through the tuyeres ... [more ▼]

The blast furnace iron making is the main method to produce liquid iron. A blast furnace is charged with ore and coke from the top along with a preheated gas introduced to the furnace through the tuyeres in the lower part. The combustion of coke generates reducing gas ascending through the blast furnace to reduce iron-bearing materials. The reduced iron-bearing particles start softening and melting because of the weight of burden above and the high temperature in the middle of the blast furnace so-called cohesive zone. In this region, as particles are softened, the void space between particles decreases. As the temperature increases further, the softened particles start melting and generate two different liquids: molten iron and slag. Then the generated liquids trickle down to the lower part of the blast furnace. The softening and melting process forms the impermeable ferrous layers forcing gas to flow horizontally through the permeable coke windows. This causes a high-pressure drop. Softening and melting has a big effect on the operation of the blast furnace and since it is not possible to interrupt the blast furnace to investigate details of the phenomena occurring inside, the numerical simulation becomes more practical. In this contribution, the eXtended Discrete Element Method (XDEM) [1] as an advanced numerical tool based on the Eulerian-Lagrangian framework, is used. Within this platform, the gas and liquid phases are described by computational fluid dynamics (CFD) and the soft-sphere discrete element approach (DEM) is used for the coke and iron ore particles. Continuous phases are coupled to the discrete entities through mass, momentum, and energy exchange. Moreover, the internal temperature distribution of the particles is described. Therefore, the XDEM is able to model multiphase and multiscale phenomena as can occur in the cohesive zone. The particle's deformation, temperature, melting, and shrinking along with gas and liquids pressure, temperature and velocity patterns are examined using the XDEM method. [less ▲]

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See detailEBC network
Lehnert, Thorsten UL

Scientific Conference (2018, June 12)

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See detailDesigning personalized, interactive materials for presentation skills
Deroey, Katrien UL

Scientific Conference (2018, June 09)

In this talk I demonstrate how we can design and adapt materials for presentation skills to build on students’ individual needs and disciplinary backgrounds in an interactive way. The context for this is ... [more ▼]

In this talk I demonstrate how we can design and adapt materials for presentation skills to build on students’ individual needs and disciplinary backgrounds in an interactive way. The context for this is a conference skills course I’ve designed and successfully taught for several years. The PhD students on this course vary greatly in their presentation skills, experience and disciplinary background. After an overview of the course content and format, I illustrate how students’ own presentations and research can be integrated so as to enhance personal relevance and interactivity. Aspects of this personalized, interactive course design include filming student presentations, structured peer feedback and reflection, a pre-course questionnaire, and tasks requiring them to work with their conference calls, research, texts, visuals and experiences. I conclude with a summary of course feedback, highlighting what students reported as being particularly useful and what they would add or change. [less ▲]

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See detailOn biselective operations
Devillet, Jimmy UL; Kiss, Gergely UL

Scientific Conference (2018, June 07)

See attached file

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See detailAlternative Actors in the Foodscape: Enabling Policies and Politics of Contested Claims for Social and Environmental Justice
Reckinger, Rachel UL

Scientific Conference (2018, June 07)

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paired with high consumer demands ... [more ▼]

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paired with high consumer demands for organic produce, leading to a largely imported organic market. As an encompassing reaction, a niche of social innovators are combining agro-ecological land use and food production with locavorousness and circular economy. Based on qualitative interviews and participant observation, we expand on four case studies of fruit and vegetable production as well as unpackaged and/or socially responsible food retail in today’s Luxembourg. One has been established since the 1980s with over 200 employees, partly in social insertion measures, producing and importing organic fruit and vegetables. Since 2014, three significantly smaller initiatives with higher citizen involvement have emerged, with a cooperative governance structure, a claimed community-supported agricultural outlook, a dynamic presence on social media and regular hands-on workshops and activities. These recent initiatives are more radical in their agro-ecological and/or permaculture practices. In a renewed enacting of circular economy precepts, they focus on local production without relying on imports, as a politicized step further than (possibly industrialized) organic production. Grounded in heterodox experiences of alternative actors in food production and retail niches, we analyse ethical entrepreneurship and the governmentality at its core, political enabling or disabling structures and regulations, as well as commodification and upscaling issues. Therefore, this paper touches on governance interrelations between food policies and politics the politics of contested claims for, and practices of, social and environmental justice. [less ▲]

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See detailFoodscapes in Transition: Policies and Politics Advancing Sustainable Development and Social Justice
Reckinger, Rachel UL; Wahlen, Stefan

Scientific Conference (2018, June 07)

In this session, we would like to discuss the impact, risks and motivations of producers and consumers altering foodscapes. Of particular interest are enabling types of governance that improve ecological ... [more ▼]

In this session, we would like to discuss the impact, risks and motivations of producers and consumers altering foodscapes. Of particular interest are enabling types of governance that improve ecological balance and social justice in policies of governmental regulation and institutions but also in the politics of for example alternative food movements. The main impact that heterodox actors can have seems to be, on one hand, the creation of resourcefulness from innovative niches, not designed to be upscaled but spread by ubiquitous networking and, on the other hand, the exemplification of heterodox economic practices that reduce the current deskilling of producers and consumers and the depletion of natural resources. The risk associated with heterodox initiatives is, besides basic economic viability, territorial competition over land and resources, as well as – more insidiously – the potential of co-option by neoliberal corporate agendas. The motivations of actors involved in such social movements, albeit diverse, tend to stem from a stance of care and ethical (self)government, often using community self-organisation-tools. Such an analysis of food value chain practices focuses on negotiations and struggles among actors in a multifaceted foodscape, where some block and some enhance transitions. Viewing the relationships, interconnectedness and agency of niche innovations and regime hegemonies opens up the perspective of contested knowledge claims. Additionally, the ways in which actors in the regulatory field advance transitions by policy measures and initiatives need to be considered, and in particular the processes of politicization as interdependencies between movement actors and the public sphere. Yet, the daily practices stay embedded in social, cultural and economic constraints and in routines, which are built on tacit knowledge, collective learning and engrained practices; even though repetitive, they can account for both reproduction and innovation. Which types of governance at all levels have shown themselves to be effective in supporting and empowering such bottom-up changes in “knowing and growing food in a contested arena” (Goodman, DuPuis, Goodman, 2014)? [less ▲]

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See detailGovernance and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2018, June 07)

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See detailThe influence of a thin weak soil layer on the pile bearing capacity.
Rica, Shilton UL; Van Baars, Stefan UL

in International Conference on Deep Foundations and Ground Improvement, Urbanization and Infrastructure Development: Future Challenges (2018, June 05)

Most pile design methods for estimating the pile bearing capacity, are based on data from the cone penetration tests (CPT), such as the Dutch (Koppejan) method, the Belgium (De Beer) method or the French ... [more ▼]

Most pile design methods for estimating the pile bearing capacity, are based on data from the cone penetration tests (CPT), such as the Dutch (Koppejan) method, the Belgium (De Beer) method or the French (Bustamante & Gianeselli) method. In all these methods, the unit cone resistance of the CPT has to be averaged within an influence zone around the pile tip, in order to be able to calculate the pile tip bearing capacity. The influence zone is defined as the zone in which the parameters of the soil have an influence on the pile tip bearing capacity. For the French method this zone is between 1.5 times the pile diameter, D, above and below the pile tip; while for the Dutch method this zone is between 8 D above to a maximum of 4 D below the pile tip. Numerical simulations on piles installed in homogeneous sandy soil, show that these definitions of the influence zone are not accurate. The simulations show an influence zone from 1 or 2 D above, to 5 or 6 D below the pile tip, depending on the soil parameters. In this research, also the influence of a weak thin soil layer on the pile bearing capacity has been studied. All simulations are made for two different thicknesses of the thin soil layer. Also the soil strength parameters and soil stiffness parameters have been varied, in order to show the influence of this thin soil layer. This influence zone has been confirmed by laboratory tests. [less ▲]

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See detailCharacterizations of nondecreasing semilattice operations on chains
Devillet, Jimmy UL; Teheux, Bruno UL

Scientific Conference (2018, June 01)

See attached file

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See detailDutch field tests validating the bearing capacity of Fundex piles
Van Baars, Stefan UL; Rica, Shilton UL; De Nijs, G.A. et al

in Proceedings of CPT’18 – International Symposium on Cone Penetration Testing (2018, June)

In 1939, Boonstra was the first to base the tip bearing capacity of foundation piles on the CPT cone resistance. Since then, many engineers and scientists have proposed improved design methods for the ... [more ▼]

In 1939, Boonstra was the first to base the tip bearing capacity of foundation piles on the CPT cone resistance. Since then, many engineers and scientists have proposed improved design methods for the bearing capacity of foundation piles, such as the Dutch Koppejan method. This method holds a mistake in the qc-averaging method. Its tip resistance is based on the cone resistance of an assumed zone between 8D above the tip and 4D below the tip, while several researchers show that this should be in a zone between 2D above the tip and 8D below the tip. In the Netherlands, Belgium and France a field test has been performed indicating that the currently used design method in the Netherlands (the Koppejan Method) was about 30% too high for the tip resistance. This, and also the current qc-averaging method, conflict with the findings of Boonstra, Plantema, Huizinga and White & Bolton. Besides, in the field test, the residual stresses in the piles after installation were completely ignored, in fact, not even measured. Nevertheless, the Dutch Norm Commission Geo-Engineering decided to reduce the bearing capacity of foundation piles in the Netherlands, unless other field tests prove otherwise. Since this reduction is very drastic and since no serious problems due to the use of the unreduced bearing capacity were recorded, the geotechnical contracting company Funderingstechnieken Verstraeten BV has performed field tests on six Fundex piles, and asked the engineering company BMNED to assist with these tests and the design. The aim was to prove that, at least for Fundex piles, a reduction of 30% is too much. The Fundex Pile Tests in Terneuzen show that, especially for the grouted Fundex piles, the pile type factor should not be reduced in combination with the current qc-averaging method. [less ▲]

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See detailLe changement de rôle des patients de maladie Chronique dans l'organisation des soins
Odero, Angela UL; Bucki, Barbara; Baumann, Michèle UL

in Pratiques et interventions en santé (2018, June)

Introduction: Les patients sont de plus en plus impliqués dans les soins qui exigent leur engagement dans la surveillance, la prévention des risques, l'auto-éducation et l'auto-traitement. Les ... [more ▼]

Introduction: Les patients sont de plus en plus impliqués dans les soins qui exigent leur engagement dans la surveillance, la prévention des risques, l'auto-éducation et l'auto-traitement. Les professionnels, quant à eux, ils sont plus enclins à adopter avec leurs patients des modèles d'interaction équitable. Sur le plan théorique, une Approche Patient Partenaire de Soins (APPS) a été proposée par des chercheurs canadiens. Pour clarifier ce que représente l’APPS, une étude qualitative a tenté d’analyser les facteurs culturels et psychosociaux qui interviennent dans la mise en place d’une APPS. Méthode : Avec l’appui des associations luxembourgeoises, six focus groupes ont été organisés avec 30 patients. A partir des retranscriptions, une analyse de contenu thématique catégorielle a été réalisée avec l’aide de N’Vivo 12 Résultats: Parmi les obstacles qui freinent une APPS, des divergences culturelles entre patients et professionnels de santé sont évoqués. Des patients préfèrent en effet rester en harmonie avec leurs valeurs et refusent de partager les prises de décision, pour eux seuls les professionnels doivent les prendre. Les échanges avec les professionnels restent compliqués car des positions dominantes et autoritaires demeurent. Parmi les facteurs favorisants APPS, on peut retenir le fait que les patients estiment avoir une connaissance de leur corps, et qu’ils ressentent l’impact que peut avoir les effets secondaires des traitements ; ceci à condition qu’ils soient capables de les verbaliser. Enfin l'accent est mis sur une confiance réciproque. Conclusion: Une éducation des patients devrait être développée pour leur permettre d’acquérir un «Capital Culturel en Santé» ; une connaissance de base favorisant la compréhension des soins et facilitant les relations avec les professionnels de santé. De même, une formation médicale et une pratique infirmière plus soutenues par des «Compétences Culturelles» permettaient aux professionnels de mieux reconnaître l'impact socioculturel que peut avoir leur identité lors de leurs relations avec les patients. [less ▲]

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See detailThe failure mechanism of pile foundations in non-cohesive soils
Van Baars, Stefan UL

in Proceedings of NUMGE 2018 9th European Conference on Numerical Methods in Geotechnical Engineering (2018, June)

In 1920 Prandtl published an analytical solution for the bearing capacity of a centric loaded strip footing on a weightless in-finite half-space, based on a so-called Prandtl-wedge failure mechanism ... [more ▼]

In 1920 Prandtl published an analytical solution for the bearing capacity of a centric loaded strip footing on a weightless in-finite half-space, based on a so-called Prandtl-wedge failure mechanism. Meyerhof and Koppejan extended the logarithmic spiral part of the Prandtl-wedge and presented this as the failure mechanism for the tip of a foundation pile in non-cohesive soils. The numerical calculations made in this article show however that the failure zone (plastic zone) below a pile tip, is far wider and deeper than the Prandtl-wedge and that there is failure both in and out of the standard x-y plane, but most of the failure is due to an out-of-plane, circumferential or cleaving failure mechanism. Therefore, this failure mechanism is differ-ent from the Prandtl-wedge failure mechanism. Around the pile tip, there are circular thin zones with no out-of-plane failure. In these thin zones, the tangential (out-of-plane) [less ▲]

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See detailFunctional equation that characterize higher order derivations
Kiss, Gergely UL

Scientific Conference (2018, June)

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See detailPerformance Analysis of CoAP under Satellite Link Disruption
Giotti, Domenico UL; Lamorte, Luca UL; Soua, Ridha UL et al

in Performance Analysis of CoAP under Satellite Link Disruption (2018, June)

Internet of Things (IoT) devices connectivity is steadily increasing in both heterogeneity and sophistication. However, classical and emerging technology (Wi-Fi, Zigbee, LoRa, etc.) are not able to ... [more ▼]

Internet of Things (IoT) devices connectivity is steadily increasing in both heterogeneity and sophistication. However, classical and emerging technology (Wi-Fi, Zigbee, LoRa, etc.) are not able to support well IoT applications, when terrestrial networks are no longer available (e.g., in remote not habitable areas, in the occurrence of calamities). Subsequently, the only way forward is to transmit IoT data over satellite. The integrated satellite-terrestrial networks are emerging as a promising solution to ensure ubiquitous IoT connectivity, higher throughput and reliability. Being different by design, IoT protocols’ tuning is needed to integrate terrestrial and satellite segments. In the current paper, we evaluate the performances of CoAP, the well-known lightweight application protocol for IoT in an integrated scenario, taking into account the satellite link disruption. The key findings of our study, conducted using the OpenSAND simulator, show that decreasing the value of congestion control parameters proposed by the standard [1], mainly ACK_TIMEOUT and ACK_RANDOM_FACTOR, is crucial to achieve lower end-to-end delays and higher packet delivery ratio. [less ▲]

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See detailClones of pivotally decomposable operations
Couceiro, Miguel; Teheux, Bruno UL

Scientific Conference (2018, June)

We investigate the clones of operations that are pivotally decomposable.

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See detailEnergy-Efficient Data Acquisition in Mobile Crowdsensing Systems
Capponi, Andrea UL

in 19th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM), Chania, Greece, 2018 (2018, June)

Mobile Crowdsensing (MCS) is one of the most promising paradigms for monitoring phenomena in urban environments. The success of a MCS campaign relies on large participation of citizens, who may be ... [more ▼]

Mobile Crowdsensing (MCS) is one of the most promising paradigms for monitoring phenomena in urban environments. The success of a MCS campaign relies on large participation of citizens, who may be reluctant in joining a campaign due to sensing and reporting costs they sustain. Hence, it is fundamental to propose efficient data collection frameworks (DCFs). In the first stages of our work, we proposed an energyefficient DCF that aims to minimize energy consumption while maximizing the utility of contributed data. Then, we developed an Android application and proposed a methodology to compare several DCFs, performing energy- and network-related measures with Power Monitor and Wireshark. Currently, we are investigating collaborative data delivery as a more efficient solution than the individual one. The key idea is to form groups of users and elect a responsible for aggregated data delivery. To this end, it is crucial to analyze device to device (D2D) communications and propose efficient policies for group formation and owner election. To evaluate the performance in realistic urban environments we exploit CrowdSenSim, which runs large-scale simulations in citywide scenarios. [less ▲]

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See detailDigital Social Networks of the Past: Issues, Limits and Challenges
Schafer, Valerie UL

Scientific Conference (2018, June)

This contribution, which lies at the intersection of two topics that will be addressed at the conference (Critical study and digital hermeneutical approaches in the humanities, and Humanities research ... [more ▼]

This contribution, which lies at the intersection of two topics that will be addressed at the conference (Critical study and digital hermeneutical approaches in the humanities, and Humanities research enabled by digital approaches), aims to analyse how the study of digital social networks of the past may challenge historians of the Web and digital cultures and help shed light on current issues concerning the heritagisation of social networks. [less ▲]

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See detailThe bearing capacity of shallow foundations on slopes
Van Baars, Stefan UL

in Proceedings of NUMGE 2018 9th European Conference on Numerical Methods in Geotechnical Engineering (2018, June)

In 1920 Prandtl published an analytical solution for the bearing capacity of a soil under a strip load. Over the years, extensions have been made for a surrounding surcharge, the soil weight, the shape of ... [more ▼]

In 1920 Prandtl published an analytical solution for the bearing capacity of a soil under a strip load. Over the years, extensions have been made for a surrounding surcharge, the soil weight, the shape of the footing, the inclination of the load, and also for a slope. In order to check the current extensions of a loaded strip footing next to a slope, many finite element calculations have been made, showing that these extensions are often inaccurate. Therefore new factors have been proposed, which are for both the soil-weight and the surcharge slope bearing capacity, based on the numerical calculations, and for the cohesion slope bearing capacity, also on an analytical solution. [less ▲]

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See detailA Mathematical Model and a Firefly Algorithm for an Extended Flexible Job Shop Problem with Availability Constraints
Tessaro Lunardi, Willian UL; Cherri, Luiz Henrique; Voos, Holger UL

in 17th International Conference on Artificial Intelligence and Soft Computing, Zakopane, Poland, June 3-7, 2018 (2018, June)

Manufacturing scheduling strategies have historically ignored the availability of the machines. The more realistic the schedule, more accurate the calculations and predictions. Availability of machines ... [more ▼]

Manufacturing scheduling strategies have historically ignored the availability of the machines. The more realistic the schedule, more accurate the calculations and predictions. Availability of machines will play a crucial role in the Industry 4.0 smart factories. In this paper, a mixed integer linear programming model (MILP) and a discrete firefly algorithm (DFA) are proposed for an extended multi-objective FJSP with availability constraints (FJSP-FCR). Several standard instances of FJSP have been used to evaluate the performance of the model and the algorithm. New FJSP-FCR instances are provided. Comparisons among the proposed methods and other state-of-the-art reported algorithms are also presented. Alongside the proposed MILP model, a Genetic Algorithm is implemented for the experiments with the DFA. Extensive investigations are conducted to test the performance of the proposed model and the DFA. The comparisons between DFA and other recently published algorithms shows that it is a feasible approach for the stated problem. [less ▲]

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See detailPOSTER: WLAN Device Fingerprinting using Channel State Information (CSI)
Adamsky, Florian UL; Retunskaia, Tatiana UL; Schiffner, Stefan UL et al

in 11th ACM Conference on Security and Privacy in Wireless and Mobile Networks (ACM WiSec) (2018, June)

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See detailHow should entrepreneurial teams behave to achieve firm growth?
Tryba, Anne UL; Breugst, Nicola

Scientific Conference (2018, June)

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See detailDerivations and differential operators on rings and fields
Kiss, Gergely UL

Scientific Conference (2018, June)

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See detailCarrier Allocation for 5G Integrated Satellite-Terrestrial Backhaul Networks
Lagunas, Eva UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in International Conference on Communications (ICT), Saint-Malo, France, June 2018. (2018, June)

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See detailIn refugees we trust: Exploring social capital formation from scratch
Iannone, Rosa Lisa UL; Geraudel, Mickaël UL

Scientific Conference (2018, June)

We are currently witnessing the highest levels of displaced people in history, with close to 66 million in a state of forced migration (UNHCR, 2017). Such numbers have placed a lot of stress on hosting ... [more ▼]

We are currently witnessing the highest levels of displaced people in history, with close to 66 million in a state of forced migration (UNHCR, 2017). Such numbers have placed a lot of stress on hosting countries to find solutions for both the social and economic integration of these populations, and in particular, refugees (Bloch, 2014; Lyon, Sepulveda & Syrett, 2007; Phillimore & Goodson, 2006). As Ram, Theodorakopoulos and Jones (2008) have suggested, small businesses and entrepreneurships by migrants illustrates their super-diversity, while highlighting an important labour option through which integration and independence may be achieved. Both opportunity-driven and necessity-driven, refugee entrepreneurs opt for selfemployment in their new countries of residence. In a notable contribution to our knowledge on the phenomenon, Sternberg, von Bloh and Brixy (2016) have evidenced that refugees may even be more likely to start businesses than natives. In accordance, they must often build entirely new social capital (SC) prior to business start-up, also as a strategy for overcoming other types of capital disadvantage. Recent studies that consider SC in relation to refugee entrepreneurship (Basok, 1993; van Kooy, 2016; Bizri, 2017; Sandberg, Immonen & Kok, in press) have emphasised the need to build critical contacts in new countries of residence, given the high value and instrumentality weak ties can bring. There is still a dearth of knowledge regarding refugee entrepreneurship in general, and their processes of SC formation for business start-up in particular. To address this lack of insight, we are undertaking a study that examines the processes of nascent entrepreneurs in a central European capital city. The study explores how SC is created in situations where nascent entrepreneurs are forced to ‘start from scratch’. That is, refugees engaging in entrepreneurial activity, who are dependent on relationships when starting their business, but have little or nothing to draw from. Leading from this, the research question undertaken in this study is a processual one: how do refugee entrepreneurs build the SC they require to start their businesses? In this paper, we adopt the threefold perspective of SC, as defined by Nahapiet and Ghoshall (1998): structural, cognitive and relational. Interrelated, the first deals with the discernable features – network ties – that link actors. The cognitive dimension manifests through shared language, narratives and codes, while the latter deals especially with bonds that emerge between actors, associated with trust, trustworthiness, obligations and expectations, as well as identity and identification. Over time, and through repeated and reciprocal interactions, SC ties may strengthen, while “relational embeddedness” extends. The source of SC, the initial formation of SC, examined through values is what we endeavour to examine. [less ▲]

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See detailORBIT - Overcoming Breakdowns in Teams with Interactive Tabletops
Sunnen, Patrick UL; Arend, Béatrice UL; Maquil, Valérie

in Kay, Judy; Luckin, Rose (Eds.) Rethinking learning in the digital age: Making the Learning Sciences count (2018, June)

ORBIT implements and studies a joint problem-solving activity at an interactive tabletop providing participants with the opportunity to develop their collaboration methods by jointly overcoming breakdowns ... [more ▼]

ORBIT implements and studies a joint problem-solving activity at an interactive tabletop providing participants with the opportunity to develop their collaboration methods by jointly overcoming breakdowns. The design and the research process relies on user-centered design methods and on an ethnomethodological conversation analytic framework. The project will generate scientific knowledge on participants’ collaboration methods and create a powerful collaborative learning tool. [less ▲]

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