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See detailDie Jugend der Gemeinde Strassen Entwicklungen, Probleme und Perspektiven: Ergebnisbericht der Jugendstudie im Rahmen des Jugendkommunalplanes für die Gemeinde Strassen
Decieux, Jean Philippe Pierre UL; Heinen, Andreas UL; Willems, Helmut UL

Report (2016)

Die vorliegende Studie zur Situation der Jugendlichen in der Gemeinde Strassen wurde von der Forschergruppe „youth research“ an der Forschungseinheit INSIDE (Integrative Research Unit on Social and ... [more ▼]

Die vorliegende Studie zur Situation der Jugendlichen in der Gemeinde Strassen wurde von der Forschergruppe „youth research“ an der Forschungseinheit INSIDE (Integrative Research Unit on Social and Individual Development) der Universität Luxemburg im Auftrag des Bürgermeister- und Schöffenrates der Gemeinde Strassen erstellt. Diese Studie ist Teil des Jugendkommunalplans für die Gemeinde Strassen und hat zum Ziel, den Verantwortlichen in Politik, Verwaltung und Jugendarbeit Informationen zu liefern, die zu einem besseren Verständnis der Jugendlichen in der Gemeinde beitragen. Denn die Gruppe der Jugendlichen repräsentiert mit ihren Wünschen, eigenen Sichtweisen und Erwartungen eine zentrale Entwicklungsperspektive für die Gemeinde Strassen. Unter anderem aus diesem Grund sind die Ergebnisse dieser Studie eine wichtige Informations- und Diskussionsgrundlage für die zukünftige Planung und Umsetzung der kommunalen Jugendpolitik und ein wichtiges Fundament für „Evidence-based-policy-making“, also eine wissensbasierte Jugendpolitik in Strassen. Diesem Anliegen entsprechend wurde diese Studie als Situations- und Bedarfsanalyse konzipiert. Wichtige thematische Aspekte sind insbesondere die Lebenswelten, das Freizeitverhalten und die Freizeitinteressen der Jugendlichen in Straßen aber auch die sozialen Herkunftsmilieus die einen starken Einfluss auf die Startbedingungen, Lebensentwürfe und Zukunftsperspektiven der Jugendlichen haben. Nicht zuletzt interessiert auch die Frage, wie die Jugendlichen unterschiedlicher Herkunft in der Gemeinde integriert sind, wie zufrieden sie mit den Angeboten und der Infrastruktur sind, welche Möglichkeiten der Partizipation für sie wichtig sind und inwiefern die Maßnahmen und Angebote der kommunalen Politik die Jugendlichen erreichen. In diesem Zusammenhang ist auch ein genauerer Blick auf die Situation der Jugendlichen mit einer ausländischen Nationalität von Interesse, zum Beispiel die Frage, wo Defizite aber auch Chancen einer stärkeren Integration oder Beteiligung dieser großen Zahl an Jugendlichen am Gemeindeleben bestehen. Bei vielen Themenbereichen sind Vergleiche mit anderen luxemburgischen oder mit internationalen Jugendstudien möglich. Dadurch können Gemeinsamkeiten sowie Besonderheiten der Gemeinde Straßen deutlich gemacht werden. [less ▲]

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See detailSymbiose aus Stahl und Stein - innovative Lösungen
Schäfer, Markus UL; Braun, Matthias; Radermacher, Christoph et al

in Revue Technique Luxembourgeoise (2016), 04/2016

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See detailNuclear Energy for Peaceful Purposes:
Al Hajjaji, Shams Al Din UL

Presentation (2016, December)

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See detailThe influence of superposition and eccentric loading on the bearing capacity of shallow foundations
Van Baars, Stefan UL

in Computations and Materials in Civil Engineering (2016), 1(3), 121-131

In 1920 Prandtl published an analytical solution for the bearing capacity of a centric loaded strip footing on a weightless in-finite half-space. Reissner (1924) extended this solution for a surrounding ... [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. Reissner (1924) extended this solution for a surrounding surcharge and Keverling Buisman (1940) for the soil weight. Terzaghi (1943) wrote this as a superposition of three separate bearing capacity components for the cohesion, surcharge and soil-weight. The first question is to what ex-tent the currently used components are correct. The second question is to what extent the superposition is correct, because the failure mechanisms for these three components are not the same. A number of finite element calculations show that there is indeed an error, which is luckily not too large and leads to predictions on the safe side. Meyerhof (1953) extended the equation of Terzaghi with correction factors for the shape of the footing and the inclination of the load. For eccentric loading however, there are no correction factors. The common practice is to reduce the contact area of the foundation such that its centroid coincides with that of the load, which means that, the area of the foundation outside the effective area, is completely neglected. Therefore the third question is, if this reduction of the foundation area is an accurate method to describe the reduction of the bearing capacity due to eccentric loading. A number of finite element calculations show that this is indeed the case. [less ▲]

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See detailReliability problems and Pareto-optimality in cognitive radar (Invited paper)
Soltanalian, M.; Mysore, R.B.S.; Ottersten, Björn UL

in Signal Processing Conference (EUSIPCO), 2016 24th European (2016, December)

Cognitive radar refers to an adaptive sensing system exhibiting high degree of waveform adaptivity and diversity enabled by intelligent processing and exploitation of information from the environment. The ... [more ▼]

Cognitive radar refers to an adaptive sensing system exhibiting high degree of waveform adaptivity and diversity enabled by intelligent processing and exploitation of information from the environment. The next generation of radar systems are characterized by their application to scenarios exhibiting non-stationary scenes as well as interference caused by use of shared spectrum. Cognitive radar systems, by their inherent adaptivity, seem to be the natural choice for such applications. However, adaptivity opens up reliability issues due to uncertainties induced in the information gathering and processing. This paper lists some of the reliability aspects foreseen for cognitive radar systems and motivates the need for waveform designs satisfying different metrics simultaneously towards enhancing the reliability. An iterative framework based on multi-objective optimization is proposed to provide Pareto-optimal waveform designs. [less ▲]

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See detailAssessing Performance of Internet of Things-based Mobile Crowdsensing Systems for Sensing as a Service Applications in Smart Cities
Capponi, Andrea UL; Fiandrino, Claudio UL; Franck, Christian UL et al

in 8th IEEE International Conference on Cloud Computing Technology and Science (CloudCom) (2016, December)

The Internet of Things (IoT) paradigm makes the Internet more pervasive. IoT devices are objects equipped with computing, storage and sensing capabilities and they are interconnected with communication ... [more ▼]

The Internet of Things (IoT) paradigm makes the Internet more pervasive. IoT devices are objects equipped with computing, storage and sensing capabilities and they are interconnected with communication technologies. Smart cities exploit the most advanced information technologies to improve public services. For being effective, smart cities require a massive amount of data, typically gathered from sensors. The application of the IoT paradigm to smart cities is an excellent solution to build sustainable Information and Communication Technology (ICT) platforms and to produce a large amount of data following Sensing as a Service (S^2aaS) business models. Having citizens involved in the process through mobile crowdsensing (MCS) techniques unleashes potential benefits as MCS augments the capabilities of existing sensing platforms. To this date, it remains an open challenge to quantify the costs the users sustain to contribute data with IoT devices such as the energy from the batteries and the amount of data generated at city-level. In this paper, we analyze existing solutions, we provide guidelines to design a large-scale urban level simulator and we present preliminary results from a prototype. [less ▲]

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See detailTHE PRIVILEGE AGAINST SELF-INCRIMINATION A Chameleon of Criminal Procedure
Lamberigts, Stijn UL

in New Journal of European Criminal Law (2016), 7(4), 418-438

This article revisits the different justifications of the privilege against self-incrimination and examines two topical issues, the relation between the privilege and documentary evidence and the ... [more ▼]

This article revisits the different justifications of the privilege against self-incrimination and examines two topical issues, the relation between the privilege and documentary evidence and the applicability of the privilege to corporations, in light of these justifications. Although the Presumption of Innocence Directive has recently addressed these two issues, several lingering uncertainties remain. [less ▲]

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See detailEine innovative Stahlverbundlösung für komplexe innerstädtische Bauprojekte
Schäfer, Markus UL; Radermacher, Christoph; Braun, Matthias et al

in Stahlbau - Nachrichten (2016), 04/16

The real estate project KONS encountered a two and a half year process of demolition of an existing building and construction of a new building complex in a central, urban location of Luxembourg City ... [more ▼]

The real estate project KONS encountered a two and a half year process of demolition of an existing building and construction of a new building complex in a central, urban location of Luxembourg City opposite of the main railway station. Thereby the ambitious specifications of the investor as well as the requirements of the local authorities could be met only through a comprehensive and intelligent planning process. The complex interrelation between logistics and construction management processes, detailing and overall economic assessment found the solution of steel-composite design highly performant and efficient in every aspect. [less ▲]

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See detailGraph-based Software Knowledge: Storage and Semantic Querying of Domain Models for Run-Time Adaptation
Hochgeschwender, Nico UL; Schneider, Sven; Voos, Holger UL et al

in IEEE International Conference on Simulation, Modeling, and Programming for Autonomous Robots SIMPAR, San Francisco, Dec 2016 (2016, December)

Software development for robots is a knowledge intensive exercise. To capture this knowledge explicitly and formally in the form of various domain models, roboticists have recently employed model-driven ... [more ▼]

Software development for robots is a knowledge intensive exercise. To capture this knowledge explicitly and formally in the form of various domain models, roboticists have recently employed model-driven engineering (MDE) approaches. However, these models are merely seen as a way to support humans during the robot's software design process. We argue that the robots themselves should be first-class consumers of this knowledge to autonomously adapt their software to the various and changing run-time requirements induced, for instance, by the robot's tasks or environment. Motivated by knowledge-enabled approaches, we address this problem by employing a graph-based knowledge representation that allows us not only to persistently store domain models, but also to formulate powerful queries for the sake of run time adaptation. We have evaluated our approach in an integrated, real-world system using the neo4j graph database and we report some lessons learned. Further, we show that the graph database imposes only little overhead on the system's overall performance. [less ▲]

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See detailA three-dimensional movement analysis of the spike in fistball
Bund, Andreas UL; Ghorbani, Saeed; Rathjens, Franziska

in Sports (2016), 4(4), 1-12

Due to its relevancy to point scoring, the spike is considered as one of the most important skills in fistball. Biomechanical analyses of this sport are very rare. In the present study, we performed a ... [more ▼]

Due to its relevancy to point scoring, the spike is considered as one of the most important skills in fistball. Biomechanical analyses of this sport are very rare. In the present study, we performed a three-dimensional kinematic analysis of the fistball spike, which helps to specify performance parameters on a descriptive level. Recorded by four synchronized cameras (120 Hz) and linked to the motion capture software Simi Motion® 5.0, three female fistball players of the second German league (24–26 years, 1.63–1.69 m) performed several spikes under standardized conditions. Results show that the segment velocities of the arm reached their maximum successively from proximal to distal, following the principle of temporal coordination of single impulses. The wrist shows maximum speed when the fist hits the ball. The elbow joint angle performs a rapid transition from a strong flexion to a (almost) full extension; however, the extension is completed after the moment of ball impact. In contrast, the shoulder joint angle increases almost linearly until the fistball contact and decreases afterward. The findings can be used to optimize the training of the spike. [less ▲]

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See detailDe la grammaire à la littérature : comment progresser de l’une à l’autre en l’espace d’un cours ?
Freyermuth, Sylvie UL

in Revue Luxembourgeoise de Littérature Générale et Comparée (2016)

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See detailRaising the Achievement of all Learners in Inclusive Education Project: Rosmini and Sereni
Limbach-Reich, Arthur UL

Scientific Conference (2016, December)

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See detailIndoor positioning and floor plan based ground truth: Can you really click where you are?
Popleteev, Andrei UL

in 15th International Conference on Mobile and Ubiquitious Multimedia (MUM-2016) (2016, December)

The increasing accuracy of indoor positioning systems requires an appropriately accurate evaluation, which compares system outputs with the known coordinates of test locations --- the ground truth ... [more ▼]

The increasing accuracy of indoor positioning systems requires an appropriately accurate evaluation, which compares system outputs with the known coordinates of test locations --- the ground truth. Although ground truth data are rarely (if ever) tested, they are traditionally assumed to be perfectly accurate. However, even small errors introduced by inaccurate ground truth need to be taken into account for fair evaluation and comparison between modern high-resolution positioning systems. In this paper we analyze the quality of ground truth data provided by clicking on an interactive floor plan (a method employed by such classical systems as RADAR and Horus). Experimental results show that this method has high precision but low accuracy, and high systematic errors make it unsuitable for evaluation of fine-grained localization systems. [less ▲]

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See detailSociability-Driven User Recruitment in Mobile Crowdsensing Internet of Things Platforms
Fiandrino, Claudio UL; Kantarci, Burak; Anjomshoa, Fazel et al

in IEEE Global Communications Conference (GLOBECOM), Washington, DC, USA, 2016 (2016, December)

The Internet of Things (IoT) paradigm makes the Internet more pervasive, interconnecting objects of everyday life, and is a promising solution for the development of next- generation services. Smart ... [more ▼]

The Internet of Things (IoT) paradigm makes the Internet more pervasive, interconnecting objects of everyday life, and is a promising solution for the development of next- generation services. Smart cities exploit the most advanced information technologies to improve and add value to existing public services. Applying the IoT paradigm to smart cities is fundamental to build sustainable Information and Communication Technology (ICT) platforms. Having citizens involved in the process through mobile crowdsensing (MCS) techniques unleashes potential benefits as MCS augments the capabilities of the platform without additional costs. Recruitment of participants is a key challenge when MCS systems assign sensing tasks to the users. Proper recruitment both minimizes the cost and maximizes the return, such as the number and the accuracy of accomplished tasks. In this paper, we propose a novel user recruitment policy for data acquisition in mobile crowdsensing systems. The policy can be employed in two modes, namely sociability-driven mode and distance-based mode. Sociability stands for the willingness of users in contributing to sensing tasks. Furthermore, we propose a novel metric to assess the efficiency of any recruitment policy in terms of the number of users contacted and the ones actually recruited. Performance evaluation, conducted in a real urban environment for a large number of participants, reveals the effectiveness of sociability-driven user recruitment as the average number of recruited users improves by at least a factor of two. [less ▲]

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See detailLinear identification of nonlinear systems: A lifting technique based on the Koopman operator
Mauroy, Alexandre UL; Goncalves, Jorge UL

in Proceedings of the 55th IEEE Conference on Decision and Control (2016, December)

We exploit the key idea that nonlinear system identification is equivalent to linear identification of the socalled Koopman operator. Instead of considering nonlinear system identification in the state ... [more ▼]

We exploit the key idea that nonlinear system identification is equivalent to linear identification of the socalled Koopman operator. Instead of considering nonlinear system identification in the state space, we obtain a novel linear identification technique by recasting the problem in the infinite-dimensional space of observables. This technique can be described in two main steps. In the first step, similar to a component of the Extended Dynamic Mode Decomposition algorithm, the data are lifted to the infinite-dimensional space and used for linear identification of the Koopman operator. In the second step, the obtained Koopman operator is “projected back” to the finite-dimensional state space, and identified to the nonlinear vector field through a linear least squares problem. The proposed technique is efficient to recover (polynomial) vector fields of different classes of systems, including unstable, chaotic, and open systems. In addition, it is robust to noise, well-suited to model low sampling rate datasets, and able to infer network topology and dynamics. [less ▲]

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See detailNorms, Polycentricity, and Polylanguaging on Social Media
Karrebæk, Martha Sif; Stæhr, Andreas; Juffermans, Kasper UL et al

in Duncker, Dorthe; Perregaard, Bettina (Eds.) Creativity and Continuity: Perspectives on the Dynamics of Language Conventionalisation (2016)

This contribution examines adolescent language use, interaction, and acts of identification on social media sites. Our approach is sociolinguistic, and we show how the understanding of language users ... [more ▼]

This contribution examines adolescent language use, interaction, and acts of identification on social media sites. Our approach is sociolinguistic, and we show how the understanding of language users today needs to break free from previously well-established sociolinguistic notions such as languages as countable units. In the following we argue that hybridity in language use is not intrinsically deviant, that language users may have multiple belongings and identifications, and that linguistic ideology must be accounted for by researchers. We also demonstrate how notions such as registers, polycentricity, and (poly)languaging enable us to address the relationships between language users, language form, social goals, and normativity. The data come from three linguistically heterogeneous European settings, and all focus on hybridity and ethnicity. [less ▲]

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See detailLocal History: Esch-sur-Sauer, Wool Factory. DIE TUCHFABRIK IN ESCH/SAUER: WOLLE GEGEN JEANS
Ganschow, Inna UL

Article for general public (2016)

The story of the family Demuth and their factory functioning now as a textile museum.

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See detailA parallel algorithm for energy efficiency maximization in massive MIMO networks
Yang, Yang UL; Pesavento, Marius

in Proc. 2016 IEEE Global Communications Conference (2016, December)

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See detailDiscrete Pompeiu problem on the plain
Kiss, Gergely UL

Presentation (2016, December)

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See detailOn the Insecurity of a Method for Providing Secure and Private Fine-Grained Access to Outsourced Data
Rial, Alfredo UL

in Abstract book of 2016 IEEE 8th International Conference on Cloud Computing Technology and Science (CloudCom) (2016, December)

The protection of sensitive data stored in the cloud is paramount. Among the techniques proposed to provide protection, attribute-based access control, which frequently uses ciphertext-policy attribute ... [more ▼]

The protection of sensitive data stored in the cloud is paramount. Among the techniques proposed to provide protection, attribute-based access control, which frequently uses ciphertext-policy attribute-based encryption (CPABE), has received a lot of attention in the last years. Recently, Jahan et al.~(IEEE 40th Conference on Local Computer Networks, 2015) propose a scheme based on CPABE where users have reading and writing access to the outsourced data. We analyze the scheme by Jahan et al.\ and we show that it has several security vulnerabilities. For instance, the cloud server can get information about encrypted messages by using a stored ciphertext and an update of that ciphertext. As another example, users with writing access are able to decrypt all the messages regardless of their attributes. We discuss the security claims made by Jahan et al.\ and point out the reasons why they do not hold. We also explain that existing schemes can already provide the advantages claimed by Jahan et al. [less ▲]

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