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See detailLa compétitivité de l'hôpital public : le cas français
Rassafi-Guibal, Hicham UL

in Chiocchetti, Paolo; Allemand, Frederic (Eds.) Compétitivité et solidarité dans l'Union européenne (2018)

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See detailA day in the digital lives of 0-3 year-olds
Gillen, Julia; Flewitt, Rosie; Aleksic, Gabrijela UL

in Journal of Early Childhood Literacy (2018)

The aim of this study is to identify the ways in which digital technologies permeate the everyday lives of children aged from birth to 3 in a number of European countries. Very few studies consider this ... [more ▼]

The aim of this study is to identify the ways in which digital technologies permeate the everyday lives of children aged from birth to 3 in a number of European countries. Very few studies consider this age group, yet there is increasing evidence that children are embedded in a digital environment from birth. [less ▲]

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See detailSocio-emotional skills and behaviour of preschool children in Serbia: A longitudinal study
Aleksic, Gabrijela UL; Ferring, Dieter UL; Merrell, Christine et al

in European Early Childhood Education Research Journal (2018)

Children’s socio-emotional skills are important for understanding their own and other’s behaviours and interactions. No study in Serbia has investigated this before. The purpose of the study was to ... [more ▼]

Children’s socio-emotional skills are important for understanding their own and other’s behaviours and interactions. No study in Serbia has investigated this before. The purpose of the study was to explore the links between early socio-emotional skills, behaviour and cognitive development of preschool children in Serbia over time.Children (N=159) age 5-8 were rated by the teachers on their socio-emotional skills and behaviour and they were tested three times over 14 months in literacy and mathematics. All the outcomes were from Time 3 and the predictors from Time 1. Children’s socio-emotional skills and behaviour were associated with gender and mathematics. Mathematics was associated with children’s social skills and literacy. Literacy was associated with adjustment, gender and mathematics. Girls were rated more positively than boys and Roma children were rated significantly lower than their peers at all times. There were no age and programme attendance differences.This study offers the first insight on the relation between socio-emotional skills, behaviour and mathematics and literacy performance of an under researched population. This is important for the development and evaluation of intervention programmes. Attrition of the sample limits the findings. [less ▲]

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See detailEarly reading of preschool children in Serbia: A longitudinal study
Aleksic, Gabrijela UL; Ferring, Dieter UL; Merrell, Christine et al

in Journal of Research in Reading (2018)

It is necessary to identify predictors of early reading, foundation of children’s school success. No study in Serbia has investigated this before. The purpose of our study was to identify predictors of ... [more ▼]

It is necessary to identify predictors of early reading, foundation of children’s school success. No study in Serbia has investigated this before. The purpose of our study was to identify predictors of early reading and explore correlates of preschool children in Serbia. Children (N=159) age 5-8 were assessed three times over 14 months by an adaptive test, Performance Indicators in Primary School (PIPS). Reading at Time 3 was predicted by gender and mathematics and not by vocabulary and phonological awareness from Time 1. Older children performed higher than younger in vocabulary, phonological awareness, reading and mathematics at Time 1 only. Girls scored higher than boys and Romani scored the lowest in reading at all times. This study offers important information on early reading of an under researched population. Attrition of the sample limits the findings. [less ▲]

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See detailA Framework for Optimizing Multi-cell NOMA: Delivering Demand with Less Resource
You, Lei; Lei, Lei UL; Yuan, Di et al

in 2017 IEEE Global Communications Conference (GLOBECOM) (2017, December)

Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far ... [more ▼]

Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far, most papers on NOMA have focused on performance gain for one or sometimes two base stations. In this paper, we study multi-cell NOMA and provide a general framework for user clustering and power allocation, taking into account inter-cell interference, for optimizing resource allocation of NOMA in multi-cell networks of arbitrary topology. We provide a series of theoretical analysis, to algorithmically enable optimization approaches. The resulting algorithmic notion is very general. Namely, we prove that for any performance metric that monotonically increases in the cells’ resource consumption, we have convergence guarantee for global optimum. We apply the framework with its algorithmic concept to a multi-cell scenario to demonstrate the gain of NOMA in achieving significantly higher efficiency. [less ▲]

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See detailCharacterizing Driving Environments Through Bluetooth Discovery
Bronzi, Walter UL; Faye, Sébastien UL; Frank, Raphaël UL et al

Scientific Conference (2017, December)

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore ... [more ▼]

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore, having knowledge of nearby Bluetooth devices, both inside and outside other vehicles, can provide the listening vehicles with enough data to learn about their environment. In this paper, we collect and analyze a dataset of Bluetooth Classic (BC) and Low Energy (BLE) discoveries. We evaluate their respective characteristics and ability to provide context-aware information from a vehicular perspective. By taking a look at data about the encountered devices, such as GPS location, quantity, quality of signal and device class information, we infer distinctive behaviors between BC and BLE relative to context and application. For this purpose, we propose a set a features to train a classifier for the recognition of different driving environments (i.e. road classes) from Bluetooth discovery data alone. Comparing the performance of our classifier with different sampling parameters, the presented results indicate that, with our feature selection, we are able to predict with reasonable confidence up to three classes (Highway, City, Extra-Urban) by using only discovery data and no geographical information. This outcome gives promising results targeted at low energy and privacy-friendly applications and can open up a wide range of research directions. [less ▲]

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See detailValue-Added Modelling in Primary and Secondary School: An Integrative Review of 674 Publications
Levy, Jessica UL; Keller, Ulrich UL; Brunner, Martin et al

Scientific Conference (2017, December)

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See detailTaxation at the Crossroads of Fundamental Rights and Fundamental Freedoms in the EU
Haslehner, Werner UL

in Haslehner, Werner; Kofler, Georg; Rust, Alexander (Eds.) EU Tax Law and Policy in the 21st Century (2017)

After nearly thirty years of dormancy with respect to direct taxation matters, the EU fundamental freedoms have been gradually accepted as a major determinant of the Member States’ freedom to impose to ... [more ▼]

After nearly thirty years of dormancy with respect to direct taxation matters, the EU fundamental freedoms have been gradually accepted as a major determinant of the Member States’ freedom to impose to taxes. Today, the power of the freedoms to limit the Member States’ competence in this area of law is accepted without question. At the same time, EU fundamental rights have, to date, played almost no role at all with respect to tax matters, let alone direct tax matters, although they were already recognized as constituent elements of primary EU law by the Court of Justice of the European Union (the Court or the CJEU) in the 1960s. This dichotomy is remarkable, not least because it is difficult to neatly disentangle fundamental freedoms from fundamental rights, as the former may well be seen as a subset of the latter. This contribution explores the doctrinal underpinnings of their existing similarities and differences as well as the interaction of both, in order to offer an explanation for the seemingly contradictory perception of both fundamental bases of primary EU law. In so doing, it will address the following questions: What is the relationship between fundamental rights and fundamental freedoms? To what extent do they limit or reinforce each other? Why has the CJEU not brought EU fundamental rights to bear in its jurisprudence on direct taxation thus far? Can or should the CJEU be more active in this respect? Thus, this contribution, first, briefly recounts the development of EU fundamental rights and fundamental freedoms and the doctrinal underpinnings of this development as a basis to analyse the scope of both components of primary law and their relationship to one another. Second, it analyses the similarities and relevant differences between fundamental rights and fundamental freedoms and suggests an answer to the question of the extent to which the fundamental freedoms can or should be considered to be fundamental rights. Finally, it assesses the application of fundamental rights in direct tax cases by looking at the clues the CJEU has left in the very little case law available with implications for this question. [less ▲]

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See detailRelay Selection Strategies for SWIPT-Enabled Cooperative Wireless Systems
Gautam, Sumit UL; Lagunas, Eva UL; Sharma, Shree K. et al

in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Montreal, Canada, Oct. 2017 (2017, October)

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See detailOptical Feeder Links Study towards Future Generation MEO VHTS Systems
Mengali, Alberto UL; Lyras, Nikos K.; Shankar, Bhavani UL et al

in Proceedings of the 35th AIAA International Communications Satellite Systems Conference (ICSSC) (2017, October)

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See detailMultiscale model of sintering: diffusion and plastic flow
Kabore, Brice Wendlassida UL; Peters, Bernhard UL

Scientific Conference (2017, September 27)

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub ... [more ▼]

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub-second time. This fast sintering force in the particular case of the snow contribute to the rheological behavior and grain rearrangement [1]. Understanding the kinetics of sintering in granular material is of great importance in some engineering applications. For decades, diffusional processes have received more attention in investigations related to the mechanisms behind sintering [2]. Some works have suggested that the plastic flow might be neglected in sintering process for stresses are not high enough to cause dislocation. However, some studies have showed that stresses experienced in fine particles necks can be high enough and even lead to plasticity driven sintering. The importance of each mechanism in the sintering process may lie in the temporal and spatial scale of interest. Increasing importance is being accorded to the role of plastic flow in sintering. however, several investigations have proved that the conventional plasticity theory may fail to predict plastic activity at micro-scale, The objective of this work is to develop adequate computational model that includes instantaneous and time-dependent plastic flow at micro-scale. We aim at extending existing models of sintering and plasticity to cope with multiple spatial and temporal scales simulations using Extended Discrete Element Method. The numerical results are compare to experimental data on snow. [less ▲]

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See detailMaster in Border Studies - ein Praxisbeispiel
Nienaber, Birte UL

Speeches/Talks (2017)

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See detailAm Grupp Sprooche léieren (radio interview)
Weyer, Dany UL

Speeches/Talks (2017)

Amplaz am Sproochecours duerch Theater Sprooche léieren, dat wor d'Konzept vun engem pedagogesche Projet, mat deem sech den Dany Weyer befaasst. D'Renée Wagener schwätzt mat him iwwer seng Beobachtung ... [more ▼]

Amplaz am Sproochecours duerch Theater Sprooche léieren, dat wor d'Konzept vun engem pedagogesche Projet, mat deem sech den Dany Weyer befaasst. D'Renée Wagener schwätzt mat him iwwer seng Beobachtung, datt d'Léieren sou net nëmme vill méi Spaass mécht, mee datt d'Kanner dobäi nach perséinlech gestäerkt ginn an Diversitéit am Grupp positiv erliewen. [less ▲]

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See detailAuf politischer Bühne: Zur Macht kultureller Aufführungen
Bloch, Natalie UL

Presentation (2017, September 13)

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See detailMechanical Model to Predict the Resistance of the Shear Connection in Composite Beams with Deep Steel Decking
Odenbreit, Christoph UL; Nellinger, Sebastian UL

in Eurosteel 2017 (2017, September 13)

The resistance of a typical shear connection with headed shear studs in a composite beam is analysed in the normal case in accordance with EN 1994-1-1. The reducing effect of a trapezoidal metal decking ... [more ▼]

The resistance of a typical shear connection with headed shear studs in a composite beam is analysed in the normal case in accordance with EN 1994-1-1. The reducing effect of a trapezoidal metal decking onto the ultimate load bearing capacity is considered with empirically derived reduction factors and equations, which have been developed in the last century between the late 70th and the early 80th. The RFCS research project “DISCCO” investigated the shear stud resistance with novel types of steel decking. In many cases, the shear resistance, which was predicted by EN 1994-1-1 was not reached in tests. In the respective experiments with composite beams and deep decking, a concrete cone failure mode was identified and not a pure shear failure of the stud. This failure mode acted in combination with the load bearing capacity of the shear stud, which formed one or two plastic hinges in the shaft - depending on the available geometry. Based on these observations, new equations have been developed to predict the shear connection’s resistance with more accurcy. The yield hinge mechanism of the shear stud, which was developed by Lungershausen, was extended by the above mentioned load bearing component ‘concrete cone’. The formulae consider the geometry of the stud and the steel decking, the material strength of the stud and of the concrete material. The statistical evaluation of the developed equations shows a good accordance with test results. [less ▲]

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See detailExperimental investigations on semi-continuous encased composite joints
Duarte Da Costa, Job UL; Obiala, Renata UL; Odenbreit, Christoph UL

in Eurosteel 2017 (2017, September 13)

The benefits brought to composite construction by the use of semi-continuous joints are well recognised and confirmed by the significant amount of research which has been performed in this area. It has ... [more ▼]

The benefits brought to composite construction by the use of semi-continuous joints are well recognised and confirmed by the significant amount of research which has been performed in this area. It has been analytically proven that at serviceability limit state (SLS) the performance of composite beams benefits from the use of semi-continuous composite joints [1]. At ultimate limit state (ULS) it is of common knowledge that the use of semi-continuous composite joints is only judicious in combination with the plastic hinge theory, which requires the verification of the rotation capacity of the joint. Despite all the effort done in this area, a concise and well-defined method to determine the rotation capacity of composite joints is lacking. Hence, a research programme with a large experimental part has been designed to investigate the behaviour of the connection between a column and a composite slim-floor beam subjected to a negative bending moment. It is the first time that the rotation capacity of an encased composite joint is analysed. The experimental campaign, presented in here, aims at determining the influence of each joint component on the rotation capacity of composite joints. Three test series have been performed; on boltless beam-to-column connections using variable longitudinal reinforcement ratio and bar diameter of the slab, on a bare bolted end-plate steel connection without reinforced concrete slab and finally on the encased composite joint with the complete bolted end-plate connection. This paper presents a detailed description of the tested specimen, shows the main results of the experimental investigations and gives an outlook on future work regarding this research project. The final goal of the research project is to develop a comprehensive methodology to predict the rotation capacity for traditional and slim-floor type of composite beams. [less ▲]

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See detailModel updating for structural health monitoring using static and dynamic measurements
Schommer, Sebastian UL; Nguyen, Viet Ha UL; Maas, Stefan UL et al

in Procedia Engineering (2017), 199

Structural health monitoring is tracking static or dynamic characteristics of a structure to identify and localize stiffness reductions for damage detection. Different damage indicators are used and any ... [more ▼]

Structural health monitoring is tracking static or dynamic characteristics of a structure to identify and localize stiffness reductions for damage detection. Different damage indicators are used and any indicator presents advantages and drawbacks. Hence the idea comes up to combine them in a model-updating procedure using a finite element model. In a first step, a model is fit to match the healthy reference state of the examined structure. Therefore it relies on minimizing a special objective function adding and weighting the differences between measured and calculated static and dynamic structural characteristics. For doing structural health monitoring the measurements are repeated in distinct time intervals and the finite element model is updated again, using the same objective function and minimization procedure. Damage can be identified and localized by highlighting reductions in the stiffness matrix of the model compared to the initial model. The efficiency of the method is illustrated by in-situ tests, where a single beam is examined that was part of a real prestressed concrete bridge. For static tests, 8 displacement transducers were disposed along the length of 40m, while the beam was mass-loaded and the deflection line is analyzed. Modal analysis was performed with swept sine excitation with constant force amplitude to identify eigenfrequencies and mode shapes. Stepwise artificial damage was provoked by cutting multiple prestressed tendons inside the concrete beam. A finite element model with a mapped mesh was created, allowing a variation of Young’s modulus in grouped sections. On real bridges temperature is neither homogenous nor constant over time, which often has a considerable influence on measured static and dynamic characteristics as the stiffness of asphalt and/or bearings can be affected. The proposed methods show their efficiency when temperature effects were excluded or compensated after measurement, which is a topic on its own and not discussed here. [less ▲]

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