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See detailSupporting Security Protocols on CAN-Based Networks
Bloom, Gedare; Cena, Gianlua; Cibrario Bertolotti, Ivan et al

Scientific Conference (in press)

The ever-increasing variety of services built on top of the Controller Area Network (CAN), along with the recent discovery of vulnerabilities in CAN-based automotive systems (some of them demonstrated in ... [more ▼]

The ever-increasing variety of services built on top of the Controller Area Network (CAN), along with the recent discovery of vulnerabilities in CAN-based automotive systems (some of them demonstrated in practice) stimulated a renewed attention to security-oriented enhancements of the CAN protocol. The issue is further compounded nowadays because, unlike in the past, security can no longer be enforced by physical bus segregation. This paper describes how CAN XR, a recently proposed extension of the CAN data-link layer, can effectively support the distributed calculation of arbitrary binary Boolean functions, which are the foundation of most security protocols, without necessarily disclosing their operands on the bus. The feasibility of the approach is then shown through experimental evaluation and by confirming its applicability to a shared key generation protocol proposed in literature. [less ▲]

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See detailMultiscale Modelling of Damage and Fracture in Discrete Materials Using a Variational Quasicontinuum Method
Rokos, Ondrej; Peerlings, Ron; Beex, Lars UL et al

Scientific Conference (2017, September 05)

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See detailKomplexes Problemlösen und Intelligenz
Greiff, Samuel UL

Scientific Conference (2017, September)

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See detailDie Trainierbarkeit von komplexem Problemlösen im Rahmen eines Trainings für Experimentieren.
Stebner, Ferdinand; Kunze, Thiemo UL; Kemper, Christoph UL et al

Scientific Conference (2017, September)

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See detailDignity as Discursive Enactment of Tradition: A Narrative Approach on Tradition in Family Business
Adiguna, Rocky UL

Scientific Conference (2017, August 06)

Our current understanding of tradition in organizations remain very limited. The lack of studies that take tradition as the main focus have made this concept overlooked as an important organizational ... [more ▼]

Our current understanding of tradition in organizations remain very limited. The lack of studies that take tradition as the main focus have made this concept overlooked as an important organizational feature. In this paper, I set out to address this issue by exploring how tradition is (re)produced and (re)interpreted in a century-old family-owned hotel. By adopting a narrative approach as an interpretive lens, I found that the reproduction and reinterpretation of tradition is discursively mediated through the notion of dignity. In particular, this paper argues for three forms of 'doing' dignity: first, dignity-by-category that is enacted through the discursive use of category making; second, dignity-by-sanctity that is enacted through sanctifying particular relations; and third, dignity-by-authority that is enacted through the exercise of authority to compel others to acknowledge one's dignity. To extend it further, the possibility of conceptual relations between tradition, dignity, and narrative identity is discussed. Drawing from the broader fields of social sciences, this study contributes to the scarce literature on tradition theory and dignity in organizations. [less ▲]

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See detailThe role of international organisations in the New Math reform process
Nadimi Amiri, Shaghayegh UL

Scientific Conference (2017, August)

This paper studies a particular school reform that travelled over countries and continents. The target reform of this paper is the New Math reform, which started in the United States and travelled through ... [more ▼]

This paper studies a particular school reform that travelled over countries and continents. The target reform of this paper is the New Math reform, which started in the United States and travelled through many European countries. This article is part of my PhD project. I previously presented some of the results in different conferences, for instance: (Nadimi, 2015a, 2015b, 2016). The present paper studies the role of the international institutions in the adaptation of the reform in Luxembourg In 1958, the School Mathematics Study Group (SMSG) in the United States started a series of mathematics reform under the title “the New Math reform”. The aim of this reform plan was to promote the “problem solving” abilities in students (Phillips, 2014, pp. 16- 59). Many of mathematicians and math educators who became a member of the SMSG, had already started working on a new system of math education at the University of Chicago since 1955. However, the launch of Sputnik satellite by the USSR in 1957 gave the opportunity to trigger the New Math reform. The origin of the New Math reform was the ‘modern mathematics’ of the French Bourbaki group. A group of French mathematicians, since 1935, under the pseudonym Nicolas Bourbaki founded the “modern mathematics” by publishing the series of Elements of Mathematics (Bourbaki's_homepage). The reform came back to its land of origin through a conference organised by OEEC (Organisation for European Economic Co-operation) in the Royaumont abbey in Paris to foster the reform movement in Europe (OECD, 1961). The official title of the conference was “New thinking in mathematics education”, but it is known as the “Royaumont seminar”. OECD (the Organisation succeeding the OEEC) published the proceeding of the conference and organised other following conferences. The fact that OEEC/OECD hosts these conferences shows the politico-economic aspect of this reform. (Tröhler, 2015, p. 6) indicates that organisations like OEEC were created to link the national and the international, to create a global sphere, and to form an institutional or organisational channel to transfer desired ideas, policies, and curricula. The practical implementations of the New Math reform, in Europe, were discussed in two international organisations: ICMI (International Commission on Mathematical Instruction), founded in 1908, and CIEAEM (Commission Internationale pour l’Étude et l’Améloration de l’Enseignement des Mathématiques), established in 1950 (Vanpaemel, 2012). Furthermore, there were also local institutions, such as Centre Belge de Pédagogie de la Mathématique (CBPM). This centre had a close collaboration with Luxembourgian teachers and school stakeholders. This paper reviews the process of the New Math reform in Luxembourg by focusing on the interactions between the international institutions and the local school system. By telling the story of Luxembourg, the paper reveals a part of history related to the acts and efforts of the mentioned international organisations in the dissemination of the New Math reform idea in Europe. It shows how the national and international interactions could help the advancement of the reform and where the collaboration met challenges. The central question that shapes the paper is that up to what point the international cooperation of Luxembourgian stakeholders could be influential at the national level. This can be an example of how the acts and efforts of international organisations interact with the local interested parties in the development of an educational idea. [less ▲]

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See detailRandom Phase Center Motion Technique for Enhanced Angle-Doppler Discrimination Using MIMO Radars
Hammes, Christian UL; Shankar, Bhavani UL; Nijsure, Yogesh UL et al

Scientific Conference (2017, August)

A random Phase Center Motion (PCM) technique is presented in this paper, based on Frequency Modulated Continuous Wave (FMCW) radar, in order to suppress the angle- Doppler coupling in Time Division ... [more ▼]

A random Phase Center Motion (PCM) technique is presented in this paper, based on Frequency Modulated Continuous Wave (FMCW) radar, in order to suppress the angle- Doppler coupling in Time Division Multiplex (TDM) Multiple- Input-Multiple-Output (MIMO) radar when employing sparse array structures. The presented approach exploits an apparently moving transmit platform or PCM due to spatio-temporal transmit array modulation. In particular, the work considers a framework utilizing a random PCM trajectory. The statistical characterization of the random PCM trajectory is devised, such that the PCM and the target motion coupling is minimal, while the angular resolution is increased by enabling the virtual MIMO concept. In more details, this paper discusses sidelobe suppression approaches within the angle-Doppler Ambiguity Function (AF) by introducing a phase center probability density function within the array. This allows for enhanced discrimination of multiple targets. Simulation results demonstrate the suppression angle- Doppler coupling by more than 30 dB, even though spatiotemporal transmit array modulation is done across chirps which leads usually to strong angle-Doppler coupling. [less ▲]

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See detailDiscussant
Greiff, Samuel UL

Scientific Conference (2017, August)

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See detailAn engineering approach to mapping meanings in products and services
Waltersdorfer, Gregor UL; Gericke, Kilian UL; Desmet, Pieter M. A. et al

Scientific Conference (2017, August)

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See detailCollaborative problem solving behavior. A deep dive into log files
Schweitzer, Nick UL; Herborn, Katharina UL; Mustafic, Maida UL et al

Scientific Conference (2017, August)

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See detailPanel participant
Greiff, Samuel UL

Scientific Conference (2017, August)

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See detaileXtended Variational Quasicontinuum Methodology for Modelling of Crack Propagation in Discrete Lattice Systems
Rokos, Ondrej; Peerlings, Ron; Zeman, Jan et al

Scientific Conference (2017, July 17)

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See detailAn equation-free multiscale method: a result of extending the quasicontinuum method to irregular structures
Beex, Lars UL; Kerfriden, Pierre

Scientific Conference (2017, July 16)

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See detailError-controlled computational fracture mechanics
Bordas, Stéphane UL

Scientific Conference (2017, July 12)

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See detailRisk, safety and assistive technology in the context of ageing-in-place
Lamotte, Mathilde UL; Ferring, Dieter UL; Tournier, Isabelle UL

Scientific Conference (2017, July 06)

When speaking about ageing in place, risk of accidents and subsequent injuries is an important part of individual worries, and risk avoidance or risk minimisation are main concerns of older people and ... [more ▼]

When speaking about ageing in place, risk of accidents and subsequent injuries is an important part of individual worries, and risk avoidance or risk minimisation are main concerns of older people and their caregivers. Findings show that older people are more at risk of unintended injuries than younger people (i.e. falls, foodborne diseases). Moreover, individual concerns and associated worries to avoid specific risks may even lead to the decision to move to an institution. In this context it is important to consider that being “as safe as possible” with respect to objective parameters does not necessarily indicate the subjective feeling of being safe. The feeling of safety and the objective degree of safety are not linearly related in a way that increasing one factor will increase the other and conversely. Furthermore, some factors that can contribute to objectively enhance safety may even lead to greater feeling of unsafety. Our review aims to investigate the relationship between objective and subjective safety in the context of ageing in place as well as the underlying mechanisms that help to explain the different links between objective and subjective safety. A further goal is offer a heuristic model presenting factors that may help to enhance older people’s consciousness of safety and thus quality of life. These include individual as well as social and macro-social factors. This paper focusses individual factors and will especially highlight the role of older people’s daily routines and their impact on technology acceptance. [less ▲]

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See detailSelf-care Assistive Technologies: A systematic review of studies on efficiency and factors influencing their use
Abrilahij, Afsaneh UL; Boll, Thomas UL; Ferring, Dieter UL

Scientific Conference (2017, July 05)

A gradual decline in functional and mental capacity, as well as a growing risk of care dependency constitute major concerns of life in old age. These are expected to become more urgent in the future ... [more ▼]

A gradual decline in functional and mental capacity, as well as a growing risk of care dependency constitute major concerns of life in old age. These are expected to become more urgent in the future, because the old-age dependency ratio in the EU is projected to nearly double until 2060 due to demographic change. On the other side, there is a strong desire to maintain the autonomy of older people as long as possible. In reaction to this, there have been strong health and social policy recommendations across Europe to develop and promote the use of assistive technologies (ATs). Whereas systematic reviews already exist for several kinds of ATs, reviews about self-care ATs are still missing. Based on a systematic literature search in PsycINFO, MEDLINE, and Google Scholar databases 203 papers were identified of which 13 were included according to our selection criteria. The methodological quality of all the reviewed studies is evaluated. We reviewed findings on objective and subjective indicators of independent living as efficiency criteria as well as evidence about facilitating and inhibiting factors in the use of these technologies. Self-care ATs turned out to be efficient, with respect to care hours, independence level, and self-reported satisfaction. The actual use of these ATs was influenced by diverse personal, contextual, and device aspects. Lack of randomized control trial studies and the need for a further research about ATs in the diverse subdomains of self-care activities is revealed. Based on the findings of the current study, we generate recommendations for future research. [less ▲]

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See detailThe Quest for Questions in Digital History: A Comparative View on Werner- and Delors Report on Economic and Monetary Union
Armaselu, Florentina UL; Danescu, Elena UL

Scientific Conference (2017, July 05)

Starting from Gaston Bachelard’s assumption that “all knowledge is an answer to a question”, the study proposes the use of comparative textual analysis to formulate research questions. A set of questions ... [more ▼]

Starting from Gaston Bachelard’s assumption that “all knowledge is an answer to a question”, the study proposes the use of comparative textual analysis to formulate research questions. A set of questions were derived via the TXM, Textométrie software, a tool for lexicometry and statistical analysis. Two historical documents on the Economic and Monetary Union (EMU) were examined, the Werner report and the Delors report (French versions). The “quest for questions” was based on the comparison of the documents, using the TXM specificities feature that highlights what properties are specific, as overuse or deficit, to a part versus the rest of a corpus. The documents were analysed both as entire units and as fragments (numbered parts and sections). The specificities were computed for the noun-adjective combination and parts of speech, the properties with specificity scores higher and lower than the TXM default positive and negative banality thresholds being selected for further enquiry and subsequently used to formulate research questions. Although further experiments, testing with other corpora and theoretical formalisation are required, the first results show that digital tools may serve not only as hypotheses or conclusions validators but also as means of discovering exploration paths to support interpretation and the construction of new knowledge in digital history. [less ▲]

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See detailOn the Scientific Applications of IGS Products: An Assessment of the Reprocessed TIGA Solutions and Combined Products
Hunegnaw, Addisu UL; Teferle, Felix Norman UL; Abraha, Kibrom Ebuy UL et al

Scientific Conference (2017, July 03)

Global sea levels have risen since the early 19th century and this rise is likely to accelerate through the 21st century and beyond. Much of the past information on sea level rise stems from the ... [more ▼]

Global sea levels have risen since the early 19th century and this rise is likely to accelerate through the 21st century and beyond. Much of the past information on sea level rise stems from the instrumental records of tide gauges, which measure changes in sea level relative to a tide gauge benchmark (TGBM) situated on land. In order to assess regional or global sea level changes the vertical land movements (VLM) at the tide gauge and its TGBM need to be monitored. GNSS, in particular GPS, has been recognized as one space-geodetic technique to provide highly accurate estimates of VLM in a geocentric reference frame for tide gauges and their TGBMs. As it turned out, this scientific application of GNSS poses the most stringent requirements on the consistency and homogeneity on the data, processing strategies, satellite products, bias models and reference frames used in the analysis of GNSS measurements. Under the umbrella of the International GNSS Service (IGS), the Tide Gauge Benchmark Monitoring (TIGA) Working Group (WG) has the objective to provide highly-accurate positions and VLM estimates for a global network of tide gauges contributing to the Global Sea Level Observing System (GLOSS) and the Permanent Service for Mean Sea Level (PSMSL). As such TIGA forms an important contribution of the IGS to the goals of the Global Geodetic Observing System (GGOS), the Global Climate Observing System (GCOS) and the World Climate Research Programme (WCRP). To achieve the TIGA-WG objectives, five TIGA Analysis Centers (TACs) contributed re-processed global GPS network solutions to TIGA, employing the latest bias models and processing strategies in accordance with the second IGS re-processing campaign (repro2). These individual TAC solutions were then used to compute the combined products by the TIGA Combination Centre (TCC) at the University of Luxembourg using an in-house modified version of the CATREF software package. In this study, we present and internally evaluate the individual TAC and TIGA combined products. We investigate station positions, scale and origin biases, including their frequency content. We also externally evaluate the combined products, particularly the VLM estimates, using solutions from the ITRF2008, ITRF2014 and the glacial isostatic adjustment model ICE-6G (VM5a). Finally, we draw some conclusions on the recent advances and remaining limitations of the various IGS products required for the challenging application to sea level studies. [less ▲]

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See detailMagnetic neutron scattering on Nd-Fe-B magnets
Michels, Andreas UL

Scientific Conference (2017, July 02)

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See detailProfiles of students on account of complex problem solving strategies
Gnaldi, M.; Bacci, S.; Greiff, Samuel UL et al

Scientific Conference (2017, July)

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See detailTo use or not to use? Investigating the validity argument for the use of short scales in research settings
Kemper, Christoph UL; Becker, N.; Baudson, T. G. et al

Scientific Conference (2017, July)

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See detailProbability signatures of multistate systems made up of two-state components
Marichal, Jean-Luc UL; Mathonet, Pierre; Jorge, Navarro et al

Scientific Conference (2017, July)

The structure signature of a system made up of $n$ components having continuous and i.i.d. lifetimes was defined in the eighties by Samaniego as the $n$-tuple whose $k$-th coordinate is the probability ... [more ▼]

The structure signature of a system made up of $n$ components having continuous and i.i.d. lifetimes was defined in the eighties by Samaniego as the $n$-tuple whose $k$-th coordinate is the probability that the $k$-th component failure causes the system to fail. More recently, a bivariate version of this concept was considered as follows. The joint structure signature of a pair of systems built on a common set of components having continuous and i.i.d. lifetimes is a square matrix of order $n$ whose $(k,l)$-entry is the probability that the $k$-th failure causes the first system to fail and the $l$-th failure causes the second system to fail. This concept was successfully used to derive a signature-based decomposition of the joint reliability of the two systems. In this talk we will show an explicit formula to compute the joint structure signature of two or more systems and extend this formula to the general non-i.i.d. case, assuming only that the distribution of the component lifetimes has no ties. Then we will discuss a condition on this distribution for the joint reliability of the systems to have a signature-based decomposition. Finally we will show how these results can be applied to the investigation of the reliability and signature of multistate systems made up of two-state components. [less ▲]

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See detailImpact of Tool Support in Patch Construction
Koyuncu, Anil UL; Bissyande, Tegawendé François D Assise UL; Kim, Dongsun UL et al

Scientific Conference (2017, July)

In this work, we investigate the practice of patch construction in the Linux kernel development, focusing on the differences between three patching processes: (1) patches crafted entirely manually to fix ... [more ▼]

In this work, we investigate the practice of patch construction in the Linux kernel development, focusing on the differences between three patching processes: (1) patches crafted entirely manually to fix bugs, (2) those that are derived from warnings of bug detection tools, and (3) those that are automatically generated based on fix patterns. With this study, we provide to the research community concrete insights on the practice of patching as well as how the development community is currently embracing research and commercial patching tools to improve productivity in repair. The result of our study shows that tool-supported patches are increasingly adopted by the developer community while manually-written patches are accepted more quickly. Patch application tools enable developers to remain committed to contributing patches to the code base. Our findings also include that, in actual development processes, patches generally implement several change operations spread over the code, even for patches fixing warnings by bug detection tools. Finally, this study has shown that there is an opportunity to directly leverage the output of bug detection tools to readily generate patches that are appropriate for fixing the problem, and that are consistent with manually-written patches. [less ▲]

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See detailThe CSD and its influence on labour law in Europe
Ratti, Luca UL

Scientific Conference (2017, June 26)

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See detailThe effect of training morphosyntactic markers in German and in French on multilingual fifth-graders' spelling.
Bilici, Natalia UL; Ugen, Sonja UL; Weth, Constanze UL

Scientific Conference (2017, June 26)

Many studies focussing on spelling in French and German languages show that, even by the end of the primary school, pupils have difficulties to encode morphosyntactic information in their writing ... [more ▼]

Many studies focussing on spelling in French and German languages show that, even by the end of the primary school, pupils have difficulties to encode morphosyntactic information in their writing. Particularly problematic are, for instance, capitalisation of nouns in German (Betzel 2014) or plural markers in French (Fayol et al. 2006), because they are inaudible and require knowledge that goes beyond simple phoneme-grapheme correspondences. Our paper presents how multilingual learners deal with silent morphosyntactic markers in French and German and shows the effects of an intervention training on children's spelling performance. In total our study included 228 multilingual fifth graders (mean age 11 years) with four years instruction in German and two years instruction in French. They were assigned to an intervention (n=137) and to a control group (n=91) based on the results of a spelling test in French and German. This was done by creating performance groups that were, in a second step, attributed to one of the experimental groups taking their performance into account (quasi-randomised procedure). The French test consisted of three word categories of different difficulty (nouns, verbs, adjectives). For adjectives only, position (pre- vs. post-nominal) was also manipulated. The German test focussed on three lexical-semantic characteristics (concrete nouns, abstract nouns, nominalizations) and four syntactical positions (determinant+noun, determinant+adjective+noun, adjective+noun, noun) frequent words and pseudo-words. Additionally, word frequency was manipulated within each language (frequent words vs. pseudowords). These difficulty levels have been based on the literature published on monolingual learners (French: Totereau et al. (2014), German: Funke (2005); Guenther (2007); Betzel (2014)). The children participated in 12 intervention sessions of 20 minutes each (six in German and six in French, the order was counterbalanced). Children of the intervention group were trained to improve their morphosyntactic awareness and thus spelling performance of French plurals and German capitalization. The control group received the same amount of language input than the intervention group, but they were trained on another aspect of language i.e. listening comprehension. Results from the pre-test show that multilingual children acquiring German and French show similar difficulty patterns as German or French monolinguals. The post-test shows that the intervention group improved significantly in both their German and French spelling in comparison to the control group in all word and pseudo-word categories and positions. The intervention group's performance increased especially on pseudo-words, indicating that the training had an effect on children's spelling according to syntactic regularities. The study results are specifically important to better understand the learning processes of morphosyntactic spelling in primary school. The implications on the teaching methods will be discussed. [less ▲]

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See detailMagnetic neutron scattering on Nd-Fe-B magnets
Michels, Andreas UL

Scientific Conference (2017, June 20)

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See detailRecent results on conservative and symmetric n-ary semigroups
Kiss, Gergely UL; Devillet, Jimmy UL; Marichal, Jean-Luc UL

Scientific Conference (2017, June 16)

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See detailOn conservative and associative operations on finite chains
Devillet, Jimmy UL; Couceiro, Miguel; Marichal, Jean-Luc UL

Scientific Conference (2017, June 16)

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Detailed reference viewed: 29 (10 UL)
See detailOn the arithmetic of modular forms
Wiese, Gabor UL

Scientific Conference (2017, June 15)

In this short overview talk, we will stress the arithmetic significance of the coefficients of modular forms. This naturally leads to questions on the distribution of the coefficients in various senses ... [more ▼]

In this short overview talk, we will stress the arithmetic significance of the coefficients of modular forms. This naturally leads to questions on the distribution of the coefficients in various senses. We will briefly touch on some of them and state some open questions. The arithmetic information in the coefficients of a Hecke eigenform is summarised in the attached Galois representation. When studying its ramification properties, one notices that forms of weight one play a special role that we will explain. [less ▲]

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See detailPerspectives on multilingualism and language learning and literacy practices of early years practitioners in Luxembourg
Kirsch, Claudine UL

Scientific Conference (2017, June 14)

Multilingual pedagogies hold promise in our heterogeneous and fast developing world on account of their inclusiveness and support for social justice and political participation. In order to help early ... [more ▼]

Multilingual pedagogies hold promise in our heterogeneous and fast developing world on account of their inclusiveness and support for social justice and political participation. In order to help early years practitioners develop these innovative methods, researchers at the university of Luxembourg offered an inquiry-based professional development course which aimed to develop the practitioners’ understanding of multilingualism, help them design literacy activities in a range of languages, and enable them to evaluate their practices. The participants were teachers and para-professionals who work with 3- to 5-year-olds in nursery schools, crèches and day care centers. These institutions focus on the learning of Luxembourgish, sometimes at the expense of home languages and of French and German, both official languages in Luxembourg. The focus on Luxembourgish must be seen in relation to the heterogeneous intake where approximately 60% of the children do not speak Luxembourgish. This paper presents the preliminary findings of a questionnaire on multilingualism, language learning and literacy practices answered by 50 practitioners prior to and following the above-mentioned professional development course. The data were triangulated with the practitioners’ video-recorded language activities. The findings show that the teachers and para-professionals view multilingualism positively and promote Luxembourgish through language use and frequent literacy activities. They occasionally communicated with the youngsters in their home languages - if known - and did not object to the children using them with peers and adults. While almost all practitioners stated that the children spoke in their home language, they diverged in their beliefs regarding the appropriateness of their use. Answers were more convergent in the post-test. The findings should deepen our understanding of early years practitioners’ beliefs and language practices and help find strategies for developing multilingual pedagogies. [less ▲]

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See detailAn Enriched Quasi-Continuum Approach to Crack Propagation in Discrete Lattices
Rokos, Ondrej; Peerlings, Ron; Zeman, Jan et al

Scientific Conference (2017, June 14)

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See detailLuxembourgish English pronunciation: first forays
Deroey, Katrien UL

Scientific Conference (2017, June 10)

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See detailOn Galois representations of weight one
Wiese, Gabor UL

Scientific Conference (2017, June 08)

Modular forms of weight one play a special role, especially those that are geometrically defined over a finite field of characteristic p. For instance, in general they cannot be obtained as reductions ... [more ▼]

Modular forms of weight one play a special role, especially those that are geometrically defined over a finite field of characteristic p. For instance, in general they cannot be obtained as reductions from weight one forms in characteristic zero. Another property is that if the level is prime-to p, then the attached mod p Galois representation is unramified at p. It is known that this property characterises weight one forms (if p>2). In this talk, I will present the approach chosen in joint work with Mladen Dimitrov to prove the unramifiedness above p in the case of Hilbert modular forms of parallel weight one over finite fields of characteristic p and level prime-to p. The approach is based on Hecke theory and exhibits an interesting behaviour of the Galois representation into an appropriate higher weight integral Hecke algebra. [less ▲]

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See detailAn equation-free multiscale method applied to discrete networks
Beex, Lars UL; Kerfriden, Pierre

Scientific Conference (2017, June 06)

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See detailRelay Selection and Transceiver Design for Joint Wireless Information and Energy Transfer in Cooperative Networks
Gautam, Sumit UL; P, Ubaidulla

Scientific Conference (2017, June 04)

In this paper, we consider optimal transceiver design and relay selection for simultaneous transfer of data and energy in a cooperative network consisting of amplify-and-forward (AF) relays. In this ... [more ▼]

In this paper, we consider optimal transceiver design and relay selection for simultaneous transfer of data and energy in a cooperative network consisting of amplify-and-forward (AF) relays. In this context, we address two different problems and propose optimal relay selection and transceiver processing. Furthermore, the problems are formulated for both time switching (TS) and power splitting (PS) schemes. The first problem is the maximization of overall rate while ensuring a minimum harvested energy at the receiver. For this problem, we perform computations of optimal fractions to distribute the received signal corresponding to TS and PS schemes, the relay weighing coefficients, and optimal relay selection. In the second problem, optimal resource allocation for maximizing the overall harvested energy at the user under constraints on the minimum achievable rate has been formulated. For this problem, we propose a suitable solution to meet the requirements for both TS and PS. For both the problems, we obtain a closed form solution. Finally, the performance of proposed design under various operating conditions and parameter values are illustrated with a comparison between TS and PS schemes. [less ▲]

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See detailKeynote: Music, heritage, function, and diversity
Sagrillo, Damien UL

Scientific Conference (2017, June 02)

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See detailProfiles of students on account of complex problem solving strategies exploited via log-data
Gnaldi, M.; Bacci, S.; Greiff, Samuel UL et al

Scientific Conference (2017, June)

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See detailA performance evaluation of weight-constrained conditioned portfolio optimization
Schiltz, Jang UL; Boissaux, Marc UL

Scientific Conference (2017, May 25)

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See detailMulticultural Diplomacy
Murdock, Elke UL

Scientific Conference (2017, May 24)

In this interactive workshop I firstly explore the concept of multiculturalism in its many facets. Participants’ own understanding, interpretations and views of the term multiculturalism will be gathered ... [more ▼]

In this interactive workshop I firstly explore the concept of multiculturalism in its many facets. Participants’ own understanding, interpretations and views of the term multiculturalism will be gathered. These personal experiences and views will then be contrasted with scholarly explorations of the term, starting with the origins in the human rights movements. Theoretical analyses of the idea(l) of multiculturalism will then be presented, including misleading and current conceptualizations. The second part of the workshop focuses on the applied side or (multi)-cultural competences necessary to navigate today’s multicultural world. What are the key competences lying at the heart of multicultural diplomacy, ensuring sustainable development? Guided by developmental psychological theory, the diversity model applied by the German Academy for International Cooperation and the Council of Europe deliberations on cultural competences we will interactively develop and discuss a catalogue of competences conducive to living as equals in culturally diverse societies. [less ▲]

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See detailHigh Frequency Acoustic Scattering in Isogeometric Analysis
Khajah, Tahsin; Antoine, Xavier; Bordas, Stéphane UL

Scientific Conference (2017, May 15)

There is an emerging need to perform high frequency scattering analysis on high-fidelity models. Conventional Finite Element analysis suffers from irretrievable loss of the boundary accuracy as well as ... [more ▼]

There is an emerging need to perform high frequency scattering analysis on high-fidelity models. Conventional Finite Element analysis suffers from irretrievable loss of the boundary accuracy as well as pollution error. Man-made geometries can be represented exactly in Isogeometric Analysis (IGA) with no geometrical loss even with very coarse mesh. The aim of this paper is to analyze the accuracy of IGA for exterior acoustic scattering problems. The numerical results show extremely low pollution error even for very high frequencies. [less ▲]

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See detailBecoming entrepreneurs: From disadvantage to actualising an entrepreneurship
Iannone, Rosa Lisa UL

Scientific Conference (2017, May 12)

In response to existing gaps in relation to entrepreneurship by vulnerable populations, the paper presents a conceptual framework, encompassing social capital – more specifically, a network-based ... [more ▼]

In response to existing gaps in relation to entrepreneurship by vulnerable populations, the paper presents a conceptual framework, encompassing social capital – more specifically, a network-based understanding of social capital – and an emancipatory perspective for a case study to be undertaken in Luxembourg. [less ▲]

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See detailInnovations and sales growth in new ventures: The mediating effect of growth intention
Gundolf, Katherine; Geraudel, Mickaël UL; Cesinger, Beate

Scientific Conference (2017, May 11)

While the direct impact of innovation on growth has been examined in entrepreneurship literature, the underlying channels of influence have remained largely unexplored. This article draws upon Behavioral ... [more ▼]

While the direct impact of innovation on growth has been examined in entrepreneurship literature, the underlying channels of influence have remained largely unexplored. This article draws upon Behavioral Reasoning Theory to examine whether growth intention is the pathway through which product, process and organizational innovations influence venture growth or not. Results from the analysis of a dataset of 20,472 French new ventures reveal that: (1) product, process and organizational innovations have a positive impact on sales revenue growth; (2) growth intention has a positive impact on sales revenue growth; and (3) growth intention mediates the effects of product and organizational innovations on sales revenue growth. These findings have implications for a more balanced and nuanced view on how innovations impact new venture growth. [less ▲]

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See detailWhat Happens Next? Language Learning Trajectory of an Iraqi Asylum Seeker in Luxembourg
Kalocsanyiova, Erika UL

Scientific Conference (2017, May 05)

The Grand Duchy of Luxembourg is often portrayed as a country of immigration. Official government policies continually draw upon the rhetoric of trilingualism to support claims about the country’s ... [more ▼]

The Grand Duchy of Luxembourg is often portrayed as a country of immigration. Official government policies continually draw upon the rhetoric of trilingualism to support claims about the country’s openness and multicultural spirit. This, along with the recognition of three languages – Luxembourgish, German and French – is expected to facilitate the integration of foreign nationals. It is claimed no Luxembourger is monolingual: moving fluidly back and forth between a multitude of languages is a communication method in its own right and members of the local society are believed to excel in it. Despite widespread acceptance and favourable attitudes towards multilingualism, language resources outside the recognised trilingual model have ambiguous statuses. As a result, broader societal multilingualism is perceived as problematic in numerous instances (Horner & Weber, 2008; Horner, 2015). In present-day language ideological debates, the strong presence of foreigners tends to be perceived as a threat to the established language regime and particularly to the position of the Luxembourgish language. The role of Luxembourgish as “language of integration” has been increasingly emphasised, although it is the one resource new arrivals are least likely to have in their communicative repertoires (de Bres, 2014). The often conflicting nationalist and multilingual language ideologies give rise to ambivalent messages as to what languages and what identities should be offered to newcomers, among them to the refugees who have sought international protection in Luxembourg. This contribution offers detailed insights into the linguistic integration trajectory of an Iraqi asylum seeker who arrived to Luxembourg in the summer of 2015. Our aim is to explore how his language resources are being compiled, enhanced and discarded in the course of the integration process, i.e. the reorganisation of his communicative repertoire. As integration seldom starts from scratch, first we report on language resources the research participant accumulated prior to his arrival to Luxembourg. These are being discussed in the context of his educational and professional experiences and future life-projects. Secondly, we examine his language learning trajectory bearing in mind the competing linguistic ideologies and practices refugees are required to adjust in their daily efforts to integrate in Luxembourg. Thirdly, we offer examples of the language practices he engaged in. These demonstrate how he responded to multilingual social settings in both language use and attitudes towards the languages and identities offered. Furthermore, they provide clues about what language resources have become part of his complex repertoire. Blommaert and Backus (2013) described language learning as a “process of growth” drawing attention to the fact that repertoires do not develop in linear fashion, but “explosively in some phases of life and gradually in some others”. Our data suggest that the process of repertoire-building is highly dynamic during this transition period. The research participant’s deliberate use of newly-acquired language resources, without regard to how well he knows the languages involved, indicates new forms of linguistic identification. These include fluid multilingual practices, which are considered to be expressions of his new emerging identity. This contribution presents data from an ongoing linguistic ethnographic research (obtained through interviews, classroom observations and shadowing) and will include a discussion about the challenges brought by working with vulnerable research participants and the need to research multilingually. [less ▲]

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See detailThe Effects of Sexualized Violence in Video Games on Rape Myth Acceptance
Fernandez de Henestrosa, Martha UL; Melzer, André UL

Scientific Conference (2017, May)

Previous research has tested the effects of video games on players’ Rape Myth Acceptance (RMA) with regard to either sexual or violent contents. The current study aimed at investigating the combined ... [more ▼]

Previous research has tested the effects of video games on players’ Rape Myth Acceptance (RMA) with regard to either sexual or violent contents. The current study aimed at investigating the combined effects of sexual and violent material in video games on players’ RMA. Participants (N = 82) played either a sexualized female game character or a non-sexualized female game character in a violent video game. Participants’ pre-gaming RMA, gender role attitudes and gaming habits were found to predict RMA after the gaming episode, but sexualized game violence did not. Furthermore, no gender differences were found with regard to RMA. The present findings corroborate the important role of pre-existing gender attitudes for the concept of RMA. In addition, future research should also focus on long-term exposure to video games and players’ gaming habits when examining the effects of sexualized violence in video games on RMA. [less ▲]

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See detailDiscrimination of Angle-Doppler Signatures using Arbitrary Phase Center Motion for MIMO Radars
Hammes, Christian UL; Nijsure, Yogesh UL; Shankar, Bhavani UL et al

Scientific Conference (2017, May)

A novel Phase Center Motion (PCM) based technique for discriminating angle-Doppler signatures within Multiple-Input-Multiple-Output (MIMO) radars using Frequency Modulated Continuous Wave (FMCW) has been ... [more ▼]

A novel Phase Center Motion (PCM) based technique for discriminating angle-Doppler signatures within Multiple-Input-Multiple-Output (MIMO) radars using Frequency Modulated Continuous Wave (FMCW) has been explored in this work. The PCM technique induces angle dependent Doppler shifts in the back-scattered signal, wherein a modified Doppler post processing for FMCW leads to joint angle-Doppler processing. Specifically, we intend to design unique spatialtemporal motion of the phase center on each individual MIMO radar channel in an effort to synthesize nearly orthogonal angle- Doppler signatures. Subsequently, we also develop a MIMO radar receiver design, which would be capable of discriminating between these induced angle-Doppler signatures. The asymptotic investigation provides a Bessel function characteristic. Simulation results demonstrate a significant side-lobe suppression of 8:5 dB for an individual PCM trajectory and 7 dB over distinct PCM trajectories, in an attempt towards realization of nearly orthogonal MIMO radar channels. [less ▲]

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See detailMeasuring fiscal effects of migrants in EU
Zanaj, Skerdilajda UL; Joxhe, Majlinda UL

Scientific Conference (2017, May)

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See detailDynamic qualitative filtering for linked (geo)visualisations: a prototype for exploring the collective memory of Instagram posts
Jones, Catherine UL; Guido, Daniele UL; Severo, Marta

Scientific Conference (2017, April 20)

This paper describes a prototype geo extension to an open source graph-based tool designed for analysing co-occurrence in large multimedia collections of historical resources. Employing an ... [more ▼]

This paper describes a prototype geo extension to an open source graph-based tool designed for analysing co-occurrence in large multimedia collections of historical resources. Employing an interdisciplinary approach, combining tools and practices from humanities and geography, we explore how it can be extended to facilitate both social and spatial enquiry. For the prototype development we use Instagram resources that reference the Via Francigena – a significant cultural route connecting Canterbury, UK and Rome, Italy. The resulting tool facilitates dynamic qualitative filtering and multilevel views to explore the social-spatial collective memory of this cultural route [less ▲]

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See detailCredit Risk Characteristics of Small Business Loan Portfolios
Wolff, Christian UL

Scientific Conference (2017, April 18)

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See detailLocational and socio-economic sorting in the use of green space: Evidence from Brussels
Schindler, Mirjam UL; Le Texier, Marion UL; Caruso, Geoffrey UL

Scientific Conference (2017, April 08)

Urban green space is important for making cities sustainable. It provides environmental benefits and makes cities attractive to people. Extensive evidence exists on their benefits but is lacking in ... [more ▼]

Urban green space is important for making cities sustainable. It provides environmental benefits and makes cities attractive to people. Extensive evidence exists on their benefits but is lacking in quantifying how and whether socio-economic benefits of green space accrue to all households or only a portion depending on their socio-economic status and residential location. From urban economic theory we know that residential markets sort households by income along an urban–suburban continuum and the housing-transport-costs trade-off. This trade-off can however be dominated in the presence of exogenous central amenities (parks) or endogenous effects (high income attracting high income) and pull better-off households toward the center, adding discrepancies in accessibility to green amenities by different socio-economic groups. Tiebout's hypothesis implied that marginal benefits from localised amenities are the same for all households in a given location but empirics point to non-efficient sorting and endogenous effects (socio-economic sorting) in the demand for localised amenities in general. We address these questions based on results of a survey conducted along an urban-suburban continuum in Brussels (Belgium) in May 2016. The survey includes around 500 respondents sampled across (non-park) public space and malls to reach both users and non-users of green space and cover the variety of residential locations (good or bad provision of green / distant or far from the CBD). We analyse the role of proximity, size and quality of public green space on its use across different socio-economic attributes and residential/job places and stated willingness-to-pay and substitution possibilities with private green space. [less ▲]

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See detail"Wie Zeki zu Göhtisch kommt": Lehrerkonstruktion im Dialog
Arend, Béatrice UL; Sunnen, Patrick UL

Scientific Conference (2017, April 07)

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See detailAddressing climate change through green building in Luxembourg and Freiburg: achieving urban sustainability or business as usual?
JUNG ép. PRELLER, Bérénice UL

Scientific Conference (2017, April 07)

Grounded into critical literature on the green economy and ecological modernisation (e.g. Gibbs and Krueger 2007; Bina 2013; Whitehead 2013; Bailey and Caprotti 2014) the proposed contribution looks at ... [more ▼]

Grounded into critical literature on the green economy and ecological modernisation (e.g. Gibbs and Krueger 2007; Bina 2013; Whitehead 2013; Bailey and Caprotti 2014) the proposed contribution looks at climate policies focusing on green building in two city regions: Luxembourg (LU) and Freiburg (DE). Although they have engaged differently and at different points in time with the topic, both identify the built environment as key in reaching urban sustainability. Through the discursive analysis of policy and media documents, further contextualised with interviews of key local actors, I will inquire how far these green building policies, following their claim to be innovative and transformative, can indeed be considered to be so, further from their technological carbon-controlling dimension. I will focus specifically on the visions, rationales and justifications mobilised to show that, despite their apparently different conceptions, green building policies in both places are framed along a "sustainability (policy) fix" (While et al. 2004; Lombardi et al. 2011) prodded by the dominant socioeconomic consensus. In Luxembourg, green building is strongly articulated as a mean to pursuit the existing model of social affluence, while in Freiburg the citizen-led achievements of the 90's have been recuperated by the city administration to competitively position itself as a leader in green wealth and quality of living (Cidell 2012; Mössner 2016). I will conclude by illustrating how this materialises into concrete building projects with very similar (technological) focuses towards carbon controlling. [less ▲]

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See detailFindel: Secure Derivative Contracts for Ethereum
Biryukov, Alex UL; Khovratovich, Dmitry UL; Tikhomirov, Sergei UL

Scientific Conference (2017, April 07)

Blockchain-based smart contracts are considered a promising technology for handling financial agreements securely. In order to realize this vision, we need a formal language to unambiguously describe ... [more ▼]

Blockchain-based smart contracts are considered a promising technology for handling financial agreements securely. In order to realize this vision, we need a formal language to unambiguously describe contract clauses. We introduce Findel -- a purely declarative financial domain-specific language (DSL) well suited for implementation in blockchain networks. We implement an Ethereum smart contract that acts as a marketplace for Findel contracts and measure the cost of its operation. We analyze challenges in modeling financial agreements in decentralized networks and outline directions for future work. [less ▲]

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See detailPortfolio Optimisation with Conditioning Information
Schiltz, Jang UL

Scientific Conference (2017, April 04)

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See detailExtending the scale of critical housing studies: Towards ‘cross-border gentrification’?
Christmann, Nathalie UL

Scientific Conference (2017, April)

Drawing upon the case of a polycentric cross-border metropolitan region in western Europe, this paper seeks to explore population mobility and housing market developments at the regional/international ... [more ▼]

Drawing upon the case of a polycentric cross-border metropolitan region in western Europe, this paper seeks to explore population mobility and housing market developments at the regional/international scale. Transnational linkages within this cross-border region intensified with the opening of the borders and the economic development of the Grand Duchy of Luxembourg as a global financial centre and a centre for European Institutions. Today about 44 per cent of employees working in Luxembourg live nearby across the Belgian, French or German border. One of the reasons is that housing prices in Luxembourg are nearly twice those in the neighbouring border regions. This increased mobility has an impact on the residents living in these areas. The research that guides this paper aims to detect perceptions of this phenomenon. Therefore principles of municipal policy, urban planning documents and the local media of three medium sized towns in the borderland are reviewed. Following a rather open research concept based on qualitative approaches (discourse analysis, grounded theory), findings reveal that locational advantages such as the proximity to Luxembourg do play a role; the perception that affordable housing is becoming increasingly critical leads to resentments that mix up with national stereotypes; while city officials report displacement due to the border-effect, they also illustrate the opportunities for regional development; at the same time property developers foster the internationalisation of urban planning. Pointing to the relational geographies that link these different places, the paper discusses the pros and cons of an umbrella concept that might be called ‘cross-border gentrification’. [less ▲]

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See detailMeasuring fiscal effects of migrants in EU
Zanaj, Skerdilajda UL; Joxhe, Majlinda UL

Scientific Conference (2017, April)

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See detailComptabiliser les crimes pour conceptualiser la violence? Le cas de la prévôté de Luxembourg (1525 et 1630)
Leuck, Jessica UL

Scientific Conference (2017, March 29)

L’historienne Laure Verdon caractérise « tout acte ou parole qui rompt le tissu social et porte atteinte à l’ordre » comme violence. De plus, le chercheur « doit s’interroger sur les formes qu’a pris la ... [more ▼]

L’historienne Laure Verdon caractérise « tout acte ou parole qui rompt le tissu social et porte atteinte à l’ordre » comme violence. De plus, le chercheur « doit s’interroger sur les formes qu’a pris la violence au fil des époques et sur le rapport que les hommes entretiennent avec elle » (Éloïse Adde, 2012). Parmi d’autres voies pour saisir cette variation historique et culturelle de la perception de la violence, nous proposons une analyse minutieuse des comptes des officiers de justice. Contrairement aux règlements, aux lois ou encore aux sources judiciaires qui expriment le fonctionnement théorique de la justice, ces comptes, de par leur caractère administratif, livrent une image réelle des crimes commis. Bien que le terme « violence » n’apparaisse jamais en tant que tel dans ces sources, les crimes et délits mentionnés dans les comptes sont considérés comme tels car ils représentent toujours une forme de violence contre le tissu social ou/et l’ordre établie. Leur présence dans ces sources et leur usage en justice permettent de projeter la conception de la violence pour une époque concrète en nous informant sur la perception quotidienne que les contemporains - surtout les justiciers - en avaient envers. En outre, la variété des cas permet de moduler cette compréhension et de proposer une lecture fine du phénomène. Conservés presque dans leur totalité pour la période de 1525 à 1630, les livres de comptes rédigés dans la prévôté de Luxembourg, une des plus grandes du duché, consistent une source primordiale pour entamer une telle recherche. [less ▲]

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See detailDigital Work and the Role of Online Platforms. The Need for an Indirect Approach
Ratti, Luca UL

Scientific Conference (2017, March 22)

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See detailDomänenspeziftät von Need for Cognition bei Sekundarschülerinnen und -schülern
Keller, Ulrich UL; Strobel, Anja; Martin, Romain UL et al

Scientific Conference (2017, March 14)

In der aktuellen Bildungsforschung werden zahlreiche nichtkognitive Konstrukte, wie Selbstkonzepte, Interesse und Schulangst, meist neben einer generellen Erfassung auch domänen- oder fachspezifisch ... [more ▼]

In der aktuellen Bildungsforschung werden zahlreiche nichtkognitive Konstrukte, wie Selbstkonzepte, Interesse und Schulangst, meist neben einer generellen Erfassung auch domänen- oder fachspezifisch erfasst. Hierzu werden Items in Selbstberichtskalen mit Bezug auf die jeweilige Domäne formuliert (z.B. „Mathematik ist eines meiner besten Fächer“). Dies trifft auf NFC bisher nicht zu – in Übereinstimmung mit der ausdrücklich domänenübergreifenden, generellen Konzeption von NFC durch die Urheber des Konstrukts (Cacioppo, Petty, Feinstein, & Jarvis, 1996). Allerdings scheint es gerade vor dem Hintergrund der Überlegungen von Cacioppo et al. (1996) zur Entwicklung von NFC im Kindesalter plausibel, dass auch NFC domänenspezifische Ausprägungen zeigt. Cacioppo et al. (1996) betonen den Einfluss von kognitiven Fähigkeiten und von (Mis-)Erfolgserfahrungen für die Entwicklung von NFC. In einem von klar abgegrenzten Fächern geprägten schulischen Umfeld und mit zunehmender Differenzierung der kognitiven Fähigkeiten (Ackerman, 2014) kann vermutet werden, dass auch im Hinblick auf die Neigung zu anstrengender kognitiver Tätigkeit interindividuell verschiedene domänenspezifische Profile sichtbar werden. Fragestellung: Zeigt NFC neben einer generellen Komponente auch domänenspezifische interindividuelle Ausprägungen? Material und Methoden: Um der Frage nach der Möglichkeit der domänenspezifischen Modellierung von NFC nachzugehen, entwickelten wir auf der Grundlage einer 5-Item-Kurzskala (basierend auf der NFC-KIDS-Skala für Grundschulkinder; Preckel & Strobel, 2017) parallel formulierte Items für die Fächer Deutsch, Französisch, Mathematik und Naturwissenschaften. Anhand einer Stichprobe von N=4595 luxemburgischen Schüler/innen der 9. Klasse untersuchten wir die so entstandene domänenspezifische NFC-Skala hinsichtlich ihrer internen Struktur, der Abgrenzbarkeit der NFC-Faktoren von domänenspezifischem Interesse, sowie der prädiktiven Validität bezüglich standardisierter Leistungstests. Befunde: Im Rahmen konfirmatorischer Faktorenanalysen ergab sich für ein nested factor-Messmodell mit einem auf allen Items ladenden Generalfaktor und korrelierten, genesteten domänenspezifischen Faktoren für Deutsch, Französisch, Mathematik und Naturwissenschaften die beste Passung (χ2[199]=1966, p<.05, CFI=.970, RMSEA=.044, SRMR=.022). Die latenten Korrelationen der domänenspezifischen Faktoren dieses Modells mit Faktoren erster Ordnung einer analog konstruierten Skala zu fachbezogenen Interessen betrugen zwischen .57 und .64; die spezifischen NFC-Faktoren waren damit klar von fachbezogenen Interessen abgrenzbar. Die domänenspezifischen NFC-Faktoren für Mathematik, Deutsch und Französisch sagten statistisch signifikant Leistungen in standardisierten Schulleistungstests im jeweils selben Fach voraus (β-Gewichte zwischen .08 und .19, p<.05). Der NFC-Generalfaktor klärte darüber hinaus signifikante Varianz nur in Mathematikleistungen auf (β=.08, p<.05). Diskussion: Weitere Untersuchungen müssen zeigen, ob sich, wie wir vermuten, die genesteten Faktoren als Profilabweichungen von einem generellen NFC-Niveau interpretieren lassen. Insbesondere scheint hier ein integrativer Ansatz der Modellierung von domänenspezifischem NFC zusammen mit weiteren nichtkognitiven Konstrukten vielversprechend (vgl. Gogol, 2015). Darüber hinaus hoffen wir mit der hier vorgestellten Skala einen Beitrag zu Erforschung der Entwicklung von NFC im schulischen Kontext leisten zu können. Literatur Ackerman, P. L. (2014). Adolescent and adult intellectual development. Current Directions in Psychological Science, 23(4), 246–251. Cacioppo, J. T., Petty, R. E., Feinstein, J. A., & Jarvis, W. B. G. (1996). Dispositional differences in cognitive motivation: The life and times of individuals varying in need for cognition. Psychological Bulletin, 119(2), 197–253. Gogol, K. (2015). Achievement motivation: Assessment, Structure and Development. Unpublished Dissertation. University of Luxembourg, Luxembourg. Preckel, F., & Strobel, A. (2017, in Druck). Need for Cognition Kinderskala (NFC-KIDS). Eine Skala zur Erfassung der kognitiven Motivation bei Grundschulkindern. Göttingen: Hogrefe. [less ▲]

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See detailReduced basis Nitsche-based domain decomposition: a biomedical application
Baroli, Davide UL; Beex, Lars UL; Hale, Jack UL et al

Scientific Conference (2017, March 10)

Nowadays, the personalized biomedical simulations demand real-time efficient and reliable method to alleviate the computational complexity of high-fidelity simulation. In such applications, the necessity ... [more ▼]

Nowadays, the personalized biomedical simulations demand real-time efficient and reliable method to alleviate the computational complexity of high-fidelity simulation. In such applications, the necessity of solving different substructure, e.g. tissues or organs, with different numbers of the degrees of freedom and of coupling the reduced order spaces for each substructure poses a challenge in the on-fly simulation. In this talk, this challenge is taken into account employing the Nitsche-based domain decomposition technique inside the reduced order model [1]. This technique with respect to other domain decomposition approach allows obtaining a solution with the same accuracy of underlying finite element formulation and to flexibly treat interface with non-matching mesh. The robustness of the coupling is determined by the penalty coefficients that is chosen using ghost penalty technique [2]. Furthermore, to reduce the computational complexity of the on-fly assembling it is employed the empirical interpolation approach proposed in [3]. The numerical tests, performed using FEniCS[4], petsc4py and slepc4py [5], shows the good performance of the method and the reduction of computation cost. [1] Baroli, D., Beex L. and Bordas, S. Reduced basis Nitsche-based domain decomposition. In preparation. [2] Burman, E., Claus, S., Hansbo, P., Larson, M. G., & Massing, A. (2015). CutFEM: Discretizing geometry and partial differential equations. International Journal for Numerical Methods in Engineering, 104(7), 472-501. [3] E. Schenone, E., Beex,L., Hale, J.S., Bordas S. Proper Orthogonal Decomposition with reduced integration method. Application to nonlinear problems. In preparation. [4] A. Logg, K.-A. Mardal, G. N. Wells et al. Automated Solution of Differential Equations by the Finite Element Method, Springer 2012. [5] L. Dalcin, P. Kler, R. Paz, and A. Cosimo, Parallel Distributed Computing using Python, Advances in Water Resources, 34(9):1124-1139, 2011. http://dx.doi.org/10.1016/j.advwatres.2011.04.013 [less ▲]

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See detailEconomic Law in the EU: How to Ensure More Convergence After the Brexit? Workshop on Corporate Law
Corbisier, Isabelle UL

Scientific Conference (2017, March 06)

See Programme at the start of the appended document for a description of the whole event, followed by the summary of Isabelle Corbisier's intervention (by herself)

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See detailStahlverbundkonstruktionen im Hochbau - Entwicklungen in der Normung
Schäfer, Markus UL

Scientific Conference (2017, March)

Die Eurocodes (EC) repräsentieren europäische Normen (EN) für die Bemessung und Konstruktion von Bauwerken im Hoch- und Brückenbau. Die Entwicklung dieser europäischen Regelwerke erfolgte im Auftrag der ... [more ▼]

Die Eurocodes (EC) repräsentieren europäische Normen (EN) für die Bemessung und Konstruktion von Bauwerken im Hoch- und Brückenbau. Die Entwicklung dieser europäischen Regelwerke erfolgte im Auftrag der Europäischen Union durch das „European Committee for Standardisation“ CEN. Seit einigen Jahren sind die Eurocodes bereits in der Anwendung. Basierend auf diesen Erfahrungen und vielfachen Kommentaren aus der Industrie erfolgt derzeit eine Überarbeitung aller Teile des Eurocodes mit dem Ziel, die aktuellen Bemessungsnormen an den Stand der Technik und Forschung anzupassen, die Anwendung zu vereinfachen sowie der Harmonisierung der Eurocodes untereinander. Abschließend werden diese Modifikationen in die zweite Generation der europäischen Normen überführt. In den folgenden Ausführungen wird die Arbeit des Projektteams SC4.T1 vorgestellt. Es wird ein Einblick in die bestehende Normungsarbeit und die fachlichen Diskussionen gegeben sowie auszugsweise die Entwürfe zu den anstehenden Änderungen der EN 1994-1-1 vorgestellt. [less ▲]

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See detailSocially assistive robots for teaching emotional abilities to children with autism spectrum disorder
Pinto Costa, Andreia UL; Steffgen, Georges UL; Rodriguez Lera, Francisco Javier UL et al

Scientific Conference (2017, March)

Socially assistive robots, when used in a way that takes into consideration children’s needs and developmental characteristics, can be useful tools to enable children’s development. More specifically, due ... [more ▼]

Socially assistive robots, when used in a way that takes into consideration children’s needs and developmental characteristics, can be useful tools to enable children’s development. More specifically, due to their characteristics (predictability, simplicity, and repetition) robots can be especially helpful to teach emotional abilities to children with autism spectrum disorder (ASD). Previous research has provided preliminary evidence that robots can help children improve in some domains such as joint attention and imitation. However, no studies have examined how robots can be integrated in intervention protocols targeting the acquisition of emotional abilities in children with ASD. This paper presents a work in progress on an emotional ability training developed for children with ASD using the QT socially assistive robot. This training aims to test whether children with ASD can benefit from a robot-mediated training to improve emotional ability. [less ▲]

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See detailExploiting Transistor-Level Reconfiguration to Optimize Combinational Circu
Raitza, Michael; Kumar, Akash; Volp, Marcus UL et al

Scientific Conference (2017, March)

Silicon nanowire reconfigurable field effect transistors (SiNW RFETs) abolish the physical separation of n-type and p-type transistors by taking up both roles in a configurable way within a doping-free ... [more ▼]

Silicon nanowire reconfigurable field effect transistors (SiNW RFETs) abolish the physical separation of n-type and p-type transistors by taking up both roles in a configurable way within a doping-free technology. However, the potential of transistor-level reconfigurability has not been demonstrated in larger circuits, so far. In this paper, we present first steps to a new compact and efficient design of combinational circuits by employing transistor-level reconfiguration. We contribute new basic gates realized with silicon nanowires, such as 2/3-XOR and MUX gates. Exemplifying our approach with 4-bit, 8-bit and 16-bit conditional carry adders, we were able to reduce the number of transistors to almost one half. With our current case study we show that SiNW technology can reduce the required chip area by 16 %, despite larger size of the individual transistor, and improve circuit speed by 26 %. [less ▲]

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See detailThe social inclusion of students with physical disabilities
Pit-Ten Cate, Ineke UL; Stevenson, Jim

Scientific Conference (2017, March)

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See detailDigitaler historischer Stadtatlas Luxemburgs (Villux10) - Projektvorstellung
Uhrmacher, Martin UL

Scientific Conference (2017, February 22)

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See detailNoise characteristics in Zenith Total Delay from homogeneously reprocessed GPS time series
Klos, Anna; Hunegnaw, Addisu UL; Teferle, Felix Norman UL et al

Scientific Conference (2017, February 22)

Zenith Total Delay (ZTD) time series, derived from the re-processing of Global Positioning System (GPS) data, provide valuable information for the evaluation of global atmospheric reanalysis products such ... [more ▼]

Zenith Total Delay (ZTD) time series, derived from the re-processing of Global Positioning System (GPS) data, provide valuable information for the evaluation of global atmospheric reanalysis products such as ERA-Interim. Identifying the correct noise characteristics in the ZTD time series is an important step to assess the ’true’ magnitude of ZTD trend uncertainties. The ZTD residual time series for 1995-2015 are generated from our homogeneously re-processed and homogenized GPS time series from over 700 globally distributed stations classified into five major climate zones. The annual peak of ZTD data ranges between 10 and 150 mm with the smallest values for the polar and Alpine zone. The amplitudes of daily curve fall between 0 and 12 mm with the greatest variations for the dry zone. The autoregressive process of fourth order plus white noise model were found to be optimal for ZTD series. The tropical zone has the largest amplitude of autoregressive noise (9.59 mm) and the greatest amplitudes of white noise (13.00 mm). All climate zones have similar median coefficients of AR(1) (0.80±0.05) with a minimum for polar and Alpine, which has the highest coefficients of AR(2) (0.27±0.01) and AR(3) (0.11±0.01) and clearly different from the other zones considered. We show that 53 of 120 examined trends became insignificant, when the optimum noise model was employed, compared to 11 insignificant trends for pure white noise. The uncertainty of the ZTD trends may be underestimated by a factor of 3 to 12 compared to the white noise only assumption. [less ▲]

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See detailAn Evaluaton of Real-Time Troposphere Products Based on mult-GNSS Precise Point Posi)oning
Ding, Wenwu; Teferle, Felix Norman UL; Kazmierski, Kamil et al

Scientific Conference (2017, February 21)

When employing observations from multiple Global Navigation Satellite System (GNSS) the performance of real-time (RT) GNSS meteorology can be improved. In this paper, we describe an operational RT system ... [more ▼]

When employing observations from multiple Global Navigation Satellite System (GNSS) the performance of real-time (RT) GNSS meteorology can be improved. In this paper, we describe an operational RT system for extracting zenith tropospheric delay (ZTD) using a modified version of the PPP-wizard. Multi-GNSS, including GPS, GLONASS and Galileo, observation streams are processed using a RT PPP strategy based on RT satellite orbit/clock products from CNES. A continuous experiment for 30 days is conducted, in which the RT observation streams of 20 globally distributed stations are processed. The initialization time and accuracy of the RT troposphere products using single/multi-system observations are evaluated. The effect of RT PPP ambiguity resolution is also evaluated. The results reveal that the RT troposphere products based on single system observations can fulfill the requirements of meteorological application, in which the GPS-only solution is better than the GLONASS-only solution in both initialization and accuracy. The performance can also be improved by applying RT PPP ambiguity resolution and utilizing multi-GNSS observations. Specifically, we notice that the ambiguity resolution is more effective in improving the accuracy, whereas the initialization process can be better accelerated by multi-GNSS observations. Combining all systems, RT troposphere products with an average accuracy of about 8 mm in ZTD can be achieved after an initialization process of approximately 9 minutes, which supports the application of multi-GNSS observations and ambiguity resolution for RT meteorological applications. [less ▲]

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See detailNew methodology for designing direct-laser-sintered motorcycle frame based on combination of topology optimization and lattice implementation
Cao, Thanh Binh UL; Kedziora, Slawomir UL

Scientific Conference (2017, February 07)

The use of direct laser sintering (DLS) has become more attractive recently since it offers a promising tool in fabricating complex components rapidly. Particularly, the technique is seen more powerful ... [more ▼]

The use of direct laser sintering (DLS) has become more attractive recently since it offers a promising tool in fabricating complex components rapidly. Particularly, the technique is seen more powerful when it is combined with computer-aid design and computational optimization. In spite of knowledge increment in the above areas presently, design method for sophisticated structures towards DLS is still far from being fully exploited. Therefore, this paper was issued to investigate a novel methodology of design, developed by combining topology optimization and lattice-beam implementation, for a blend-solid-lattice frame of a motorcycle. From the obtained results, it was recognized that the as-built tubular hybrid structure demonstrated comparable values of first resonant frequency and mass with respected to those of the original. Additionally, it was found that stiffness of the generated structures depended strongly on locations where lattice was substituted. In particular, less stressed frame’s components were evidenced as appropriate regions for the substitution. The achieved results also revealed estimated buckling load factors, being circa 17 times higher than applied bumping loads acted on the tubular-lattice structure. Finally, equivalent stress predicted in static analyses confirmed all designs working safely in nominated conditions. Based on these achievements, it is believed that the new method worked quite acceptably in designing direct-laser-sintered motorcycle frame, and it is very promising to further develop the method as well as extend it into different complex direct-laser-sintered elements designed for future applications. [less ▲]

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See detailCanonically defined star products for Kaehler manifolds
Schlichenmaier, Martin UL

Scientific Conference (2017, February 07)

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See detailTeacher-Student Relationship and Its Impact on Students' Desire for Knowledge
Voynova, Ruzhena UL; Weber, Jean-Marie UL

Scientific Conference (2017, February)

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See detailInherently Unneutral Investment Treaty Arbitration and Never-Ending Excuses
Radović, Relja UL

Scientific Conference (2017, February)

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See detailLes stratégies de résolution de problèmes d'élèves de 3e primaire face à des problèmes non routiniers : impact des modalités de travail (résolution individuelle vs collaborative).
Gamo, Sylvie UL

Scientific Conference (2017, January 27)

The assumption underlying the present study is that solving individually or collaboratively a non-routine problem influences the implementation of the strategies. In our experiment, 909 3rd graders from ... [more ▼]

The assumption underlying the present study is that solving individually or collaboratively a non-routine problem influences the implementation of the strategies. In our experiment, 909 3rd graders from Luxembourg primary schools were randomly assigned to two different groups: an individual group and a collaborative group. In both groups students had to solve a non-routine problem in which several solving strategies can be admitted. The results showed that among the correct problem solving strategies, the formal strategy and the guess and check strategy were proportionally more implemented in the collaborative condition than in the individual condition. Implications of these results for educational purposes are discussed; suggestions for future research are made. [less ▲]

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See detailMultiphysics applications and computational challenges
Zilian, Andreas UL

Scientific Conference (2017, January 24)

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