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

Scientific Conference (2017, March)

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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 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 detailCanonically defined star products for Kaehler manifolds
Schlichenmaier, Martin UL

Scientific Conference (2017, February 07)

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

Scientific Conference (2017, February)

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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 detailMultiphysics applications and computational challenges
Zilian, Andreas UL

Scientific Conference (2017, January 24)

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See detailIntergenerational differences in social and political participation in Western Europe
Meyers, Christiane UL

Scientific Conference (2017, January 17)

The global crisis and its negative consequences on living conditions in Europe have led in some countries to massive protests, especially among young persons. Kern et al. (2015) argue that this rising and ... [more ▼]

The global crisis and its negative consequences on living conditions in Europe have led in some countries to massive protests, especially among young persons. Kern et al. (2015) argue that this rising and sudden political engagement can be explained by grievance theory: individuals whose interests are threatened react by engaging themselves politically. However, they also demonstrate that political participation in a more long-term perspective is better explained by the civic voluntarism model. Brady et al. (1995) establish that resources like time, money and civic skills are central for getting politically active. Persons with a low socioeconomic status who possess fewer resources are generally less political active. In a long-term perspective the economic crisis and the deterioration of living conditions should lead to less political participation of young people. I want to use the civic voluntarism model to analyse and describe the changing political participation forms of different generations. Generations are defined as persons having experienced similar historical conditions when growing up, thus developing similar values and beliefs (Grasso, 2014). I will look at the generation of the baby boomers born after World War II and compare them to the generation Y born before the turn of the millennium. Both generations grew up in times of social changes and challenges. I will use a broad definition of participation, which integrates political and social engagement, to look at the different participation modes of the generations (Meyers & Willems, 2016; Sloam, 2014; Dalton, 2008). The analysis is based on data of the European Values Study and uses multivariate methods (factor and cluster analysis) to determine different engagement types within the two generations in Western Europe. Are there signs that the young generation disengages from society? Do they engage themselves in other ways than the older generation? How can the civic voluntarism model help to explain the differences between older and younger generations? [less ▲]

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See detailChez nous, les fraises ne poussent pas en hiver. Le rôle de la locavoracité dans la (re)prise de conscience de la saisonnalité des aliments
Reckinger, Rachel UL

Scientific Conference (2017, January 11)

Basé sur deux études empiriques, conjointement quantitatives et qualitatives, menées dans le contexte de deux projets interdisciplinaires à l’Université du Luxembourg, l’argumentaire porte sur l’interface ... [more ▼]

Basé sur deux études empiriques, conjointement quantitatives et qualitatives, menées dans le contexte de deux projets interdisciplinaires à l’Université du Luxembourg, l’argumentaire porte sur l’interface régionalité / saisonnalité tant au Grand-Duché que dans les régions limitrophes. En effet, dans les populations considérées, la régionalité comme qualification alimentaire prime largement sur la saisonnalité, qui, elle, demande une réflexivité et une conscience agricole plus importante. Mais la forme locavore de la notion de régionalité est actuellement une tendance montante et elle favorise, justement, une (re)prise de conscience des contextes géolocalisés de la production alimentaire. Sa diffusion pourrait avoir un impact positif sur la saisonnalité tant dans les représentations que dans les pratiques des consommateurs – en tant que facteur de réduction d’émissions liées au transport, de potentiel d’identification communautaire et de valorisation locale, ainsi que de lutte contre le gaspillage alimentaire. [less ▲]

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See detailAsset Pricing under Rational Learning about Rare Disasters
Koulovatianos, Christos UL; Wieland, Volker

Scientific Conference (2017, January 07)

Why is investment in stocks so persistently weak after a rare disaster? Connecting disaster episodes with post-disaster expectations seems crucial for such post-disaster forecasting and also policymaking ... [more ▼]

Why is investment in stocks so persistently weak after a rare disaster? Connecting disaster episodes with post-disaster expectations seems crucial for such post-disaster forecasting and also policymaking, but rational-expectations models with variable disaster risk often fail to achieve this connection. To this end, while retaining full rationality, we introduce limited information and learning about rare-disaster risk and show that the resulting stock-investment behavior seems similar to persistent investor fear after a rare disaster. We study, (a) rational learning for state verification (RLS), with investors knowing the data-generating process of disaster riskiness but being unable to observe whether the economy is in a riskier state (regime) or not, and (b) rational learning about the data-generating process (RLP) of disaster risk, with investors also being unaware of the data-generating process of disaster riskiness. We analytically show that both RLS and RLP synchronize disaster events with post-disaster expectations and asset prices, and create persistence in price-dividend ratios even if data-generating processes of disaster risk have no persistence. Using De Finetti's theorem we show that RLP offers an explanation for global spells of pessimism and weak investment after a disaster. [less ▲]

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See detailData Abundance and Asset Price Informativeness
Dugast, Jérôme UL; Foucault, Thierry

Scientific Conference (2017, January 06)

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See detailWhere to Hide in Bad Times: Or Should One Still Diversify Internationally?
Stefanova, Denitsa UL; Elkamhi, Redouane

Scientific Conference (2017)

Among the stylized features of international equity markets is the pronounced asymmetric nonlinear dependence and upward trend in correlations. Such features call into question investors' efforts to ... [more ▼]

Among the stylized features of international equity markets is the pronounced asymmetric nonlinear dependence and upward trend in correlations. Such features call into question investors' efforts to diversify internationally. We propose a model to capture those well understood characteristics of international equity index returns. Casting them in a dynamic portfolio problem, we evaluate the gains for a home-biased investor from including foreign assets in her portfolio. We find that accounting for the optimal dynamic demand for hedging on top of a standard mean-variance portfolio policy brings substantial benefits from international portfolio exposure. Such benefits become increasingly sizeable over long investment horizons. [less ▲]

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See detailValidity and usefulness of the Highly Sensitive Personality Scale Based on a representative German sample
Baudson, T. G.; Ostendorf, F.; Becker, N. et al

Scientific Conference (2017)

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See detailUnderstanding the underpinnings of complex problem solving in a higher-education setting
Musso, M.; Gonzalez, P.; Mustafic, Maida UL et al

Scientific Conference (2017)

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See detailN-point Virasoro algebras are multi-point Krichever-Novikov type algebras
Schlichenmaier, Martin UL

Scientific Conference (2016, December 14)

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See detailGlobal converegence properties of a consensus protocol on the n-sphere
Markdahl, Johan UL; Goncalves, Jorge UL

Scientific Conference (2016, December 13)

This paper provides a novel analysis of the global convergence properties of a well-known consensus protocol for multi-agent systems that evolve in continuous time on the n-sphere. The feedback is ... [more ▼]

This paper provides a novel analysis of the global convergence properties of a well-known consensus protocol for multi-agent systems that evolve in continuous time on the n-sphere. The feedback is intrinsic to the n-sphere, i.e., it does not rely on the use of local coordinates obtained through a parametrization. It is shown that, for any connected undirected graph topology and all n>1, the consensus protocol yields convergence that is akin to almost global consensus in a weak sense. Simulation results suggest that actual almost global consensus holds. This result is of interest in the context of consensus on Riemannian manifolds since it differs from what is known with regard to the 1-sphere and SO(3) where more advanced intrinsic consensus protocols are required in order to generate equivalent results. [less ▲]

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See detailL'enseignement transsystémique du droit des contrats: l'expérience luxembourgeoise
Ancel, Pascal UL

Scientific Conference (2016, December 13)

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See detailAvoiding Leakage and Synchronization Attacks through Enclave-Side Preemption Control
Volp, Marcus UL; Lackorzynski, Adam; Decouchant, Jérémie UL et al

Scientific Conference (2016, December 12)

Intel SGX is the latest processor architecture promising secure code execution despite large, complex and hence potentially vulnerable legacy operating systems (OSs). However, two recent works identified ... [more ▼]

Intel SGX is the latest processor architecture promising secure code execution despite large, complex and hence potentially vulnerable legacy operating systems (OSs). However, two recent works identified vulnerabilities that allow an untrusted management OS to extract secret information from Intel SGX's enclaves, and to violate their integrity by exploiting concurrency bugs. In this work, we re-investigate delayed preemption (DP) in the context of Intel SGX. DP is a mechanism originally proposed for L4-family microkernels as disable-interrupt replacement. Recapitulating earlier results on language-based information-flow security, we illustrate the construction of leakage-free code for enclaves. However, as long as adversaries have fine-grained control over preemption timing, these solutions are impractical from a performance/complexity perspective. To overcome this, we resort to delayed preemption, and sketch a software implementation for hypervisors providing enclaves as well as a hardware extension for systems like SGX. Finally, we illustrate how static analyses for SGX may be extended to check confidentiality of preemption-delaying programs. [less ▲]

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See detailN-point Virasoro algebras are multi-point Krichever-Novikov type algebras
Schlichenmaier, Martin UL

Scientific Conference (2016, December 12)

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See detailDeep Learning on Big Data Sets in the Cloud with Apache Spark and Google TensorFlow
Glauner, Patrick UL; State, Radu UL

Scientific Conference (2016, December 09)

Machine learning is the branch of artificial intelligence giving computers the ability to learn patterns from data without being explicitly programmed. Deep Learning is a set of cutting-edge machine ... [more ▼]

Machine learning is the branch of artificial intelligence giving computers the ability to learn patterns from data without being explicitly programmed. Deep Learning is a set of cutting-edge machine learning algorithms that are inspired by how the human brain works. It allows to selflearn feature hierarchies from the data rather than modeling hand-crafted features. It has proven to significantly improve performance in challenging data analytics problems. In this tutorial, we will first provide an introduction to the theoretical foundations of neural networks and Deep Learning. Second, we will demonstrate how to use Deep Learning in a cloud using a distributed environment for Big Data analytics. This combines Apache Spark and TensorFlow, Google’s in-house Deep Learning platform made for Big Data machine learning applications. Practical demonstrations will include character recognition and time series forecasting in Big Data sets. Attendees will be provided with code snippets that they can easily amend in order to analyze their own data. A related, but shorter tutorial focusing on Deep Learning on a single computer was given at the Data Science Luxembourg Meetup in April 2016. It was attended by 70 people making it the most attended event of this Meetup series in Luxembourg ever since its beginning. [less ▲]

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See detailAufbauen auf den mehrsprachigen Ressourcen der Kinder,
Kirsch, Claudine UL

Scientific Conference (2016, December 07)

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See detailA tracking error control approach for model predictive position control of a quadrotor with time varying reference
Dentler, Jan Eric UL; Kannan, Somasundar UL; Olivares Mendez, Miguel Angel UL et al

Scientific Conference (2016, December 06)

In mobile robotic applications, a common problem is the following of a given trajectory with a constant velocity. Using standard model predictive control (MPC) for tracking of time varying trajectories ... [more ▼]

In mobile robotic applications, a common problem is the following of a given trajectory with a constant velocity. Using standard model predictive control (MPC) for tracking of time varying trajectories leads to a constant tracking error. This problem is modelled in this paper as quadrotor position tracking problem. The presented solution is a computationally light-weight target position control (T PC), that controls the tracking error of MPCs for constantly moving targets. The proposed technique is assessed mathematically in the Laplace domain, in simulation, as well as experimentally on a real quadrotor system. [less ▲]

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See detailBubbles and Trading Frenzies: Evidence from the Art Market
Penasse, Julien UL

Scientific Conference (2016, December)

Detailed reference viewed: 9 (1 UL)
See detailRaising the Achievement of all Learners in Inclusive Education Project: Rosmini and Sereni
Limbach-Reich, Arthur UL

Scientific Conference (2016, December)

Detailed reference viewed: 28 (2 UL)
See detailValuing American options using fast recursive projections
Cosma, Antonio UL; Galluccio, Stefano; Pederzoli, Paola et al

Scientific Conference (2016, December)

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See detailL'exrcice du droit de retrait au regard des droits constitutionnels britannique et européen
Gerkrath, Jörg UL

Scientific Conference (2016, November 25)

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See detailMetadiscourse in lectures: the case of importance marking
Deroey, Katrien UL

Scientific Conference (2016, November 19)

This paper surveys how relative importance is marked lexicogrammatically in lectures (cf. Deroey and Taverniers, 2012; Deroey, 2014; Deroey, 2015). Markers of (lesser) importance (e.g. the point is ... [more ▼]

This paper surveys how relative importance is marked lexicogrammatically in lectures (cf. Deroey and Taverniers, 2012; Deroey, 2014; Deroey, 2015). Markers of (lesser) importance (e.g. the point is, remember, anyway, briefly) are metadiscursive devices combining discourse organization with evaluation along a ‘parameter of importance or relevance’ (Thompson and Hunston, 2000: 24). Such marking can benefit lecture comprehension, note-taking and retention. Using corpus-driven and corpus-based methods, 40 lectures from the British Academic Spoken English (BASE) corpus were first manually examined to identify candidate markers. Further instances of these and related markers were then retrieved from the whole corpus of 160 lectures using Corpus Query Language in Sketch Engine. A wide variety of markers were thus attested, the predominant ones of which are not the ones we would intuitively think of. Markers of important information were classified into lexicogrammatical patterns depending on the word class of their main lexeme. The multifunctional, semi-fixed expressions ‘the point is’ and ‘remember’ predominate over more stereotypical, explicit markers such as ‘the important point is’. Markers of lesser importance were classified according to how they achieved their effect. Most denote partial relevance (e.g. detail, in passing, briefly) rather than irrelevance (e.g. not pertinent, not matter, trash) and some markers appear pragmaticalized in certain contexts. As many markers required significant interpretation to achieve their importance marking effect, an understanding of the lecture genre as well as co-textual, visual, non-verbal and prosodic clues seem particularly important in identifying their precise status. This poses a challenge to quantification. Indeed, Hunston’s observation that ‘much evaluative meaning is not obviously identifiable, as it appears to depend on immediate context and on reader assumptions about value’ (2004: 157) is particularly pertinent here. Deroey, K. L. B., & Taverniers, M. (2012). ‘Ignore that'cause it's totally irrelevant’: marking lesser relevance in lectures. Journal of Pragmatics, 44(14), 2085-2099. Deroey, K. L. B. (2014). ‘Anyway, the point I'm making is’: Lexicogrammatical relevance marking in lectures. In L. Vandelanotte, D. Kristin, G. Caroline, & K. Ditte (Eds.), Recent advances in corpus linguistics: developing and exploiting corpora (pp. 265-291). Amsterdam: Rodopi. Deroey, K. L. B. (2015). Marking importance in lectures: interactive and textual orientation. Applied Linguistics, 36(1), 51-72. Thompson, G., & Hunston, S. (2000). Evaluation: An introduction. In Hunston, S., & Thompson, G. (Eds.), Evaluation in text: authorial stance and the construction of discourse (pp. 1-27). Oxford: OUP. [less ▲]

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

Scientific Conference (2016, November 17)

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See detailAn approach to information retrieval and question answering in the legal domain
Adebayo, Kolawole John UL; Di Caro, Luigi; Boella, Guido et al

Scientific Conference (2016, November 15)

We describe in this paper, a report of our participation at COLIEE 2016 Information Retrieval (IR) and Legal Question Answering (LQA) tasks. Our solution for the IR part employs the use of a simple but ... [more ▼]

We describe in this paper, a report of our participation at COLIEE 2016 Information Retrieval (IR) and Legal Question Answering (LQA) tasks. Our solution for the IR part employs the use of a simple but effective Machine Learning (ML) procedure. Our Question Answering solution answers "YES or 'NO' to a question, i.e., 'YES' if the question is entailed by a text and 'NO' otherwise. With recent exploit of Multi-layered Neural Network systems at language modeling tasks, we presented a Deep Learning approach which uses an adaptive variant of the Long-Short Term Memory (LSTM), i.e. the Child Sum Tree LSTM (CST-LSTM) algorithm that we modified to suit our purpose. Additionally, we benchmarked this approach by handcrafting features for two popular ML algorithms, i.e., the Support Vector Machine (SVM) and the Random Forest (RF) algorithms. Even though we used some features that have performed well from similar works, we also introduced some semantic features for performance improvement. We used the results from these two algorithms as the baseline for our CST-LSTM algorithm. All evaluation was done on the COLIEE 2015 training and test sets. The overall result conforms the competitiveness of our approach. [less ▲]

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See detailThe Orchestration Stack: The Impossible Task of Designing Software for Unknown Future Post-CMOS Hardware
Volp, Marcus UL; Klüppelholz, Sascha; Castrillon, Jeronimo et al

Scientific Conference (2016, November 14)

Future systems based on post-CMOS technologies will be wildly heterogeneous, with properties largely unknown today. This paper presents our design of a new hardware/software stack to address the challenge ... [more ▼]

Future systems based on post-CMOS technologies will be wildly heterogeneous, with properties largely unknown today. This paper presents our design of a new hardware/software stack to address the challenge of preparing software development for such systems. It combines well-understood technologies from different areas, e.g., network-on-chips, capability operating systems, flexible programming models and model checking. We describe our approach and provide details on key technologies. [less ▲]

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See detailZoltán Kodály, Marcel Landowsky und Leo Kestenberg. Musikalische Bildung und ihre Reformer
Sagrillo, Damien UL

Scientific Conference (2016, November 11)

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See detailMusikalische Bildung - (drei) europäische Taditionen im Überblick
Sagrillo, Damien UL

Scientific Conference (2016, November 10)

I will present the two personalities of Leo Kestenberg and Marcel Landowski; I will describe their life-work and relate it to Zoltán Kodály, the eminent Hungarian composer, ethnomusicologist and music ... [more ▼]

I will present the two personalities of Leo Kestenberg and Marcel Landowski; I will describe their life-work and relate it to Zoltán Kodály, the eminent Hungarian composer, ethnomusicologist and music pedagogue. However, the study will be based on Marcel Landowski, because, until now, no German documents are dealing with his life and achievements. Although acknowledged in their countries as musicians and of music organisers, Kestenberg and Landowski are not known in the respective other country. On the other hand, Zoltán Kodály is recognised worldwide. It is for this reason that a comparative study is necessary. Nevertheless, this paper cannot be complete but should be a motivation for further research about the organisation of music education, the organisation of music including the political background in the countries presented in this document or the larger context of European nations. [less ▲]

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See detailCross-border regional policy cooperation as cross-border practice formation: a topic outline
Wille, Christian UL

Scientific Conference (2016, November 09)

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See detailStudying Scarring Effects Using Factorial Designs: Rating or Ranking?
Imdorf, Christian; Sacchi, Stefan; Samuel, Robin UL et al

Scientific Conference (2016, November 09)

Early job insecurity is a much-discussed topic across European countries. Research overwhelmingly found that being unemployed after graduation affects employment chances and also future wages negatively ... [more ▼]

Early job insecurity is a much-discussed topic across European countries. Research overwhelmingly found that being unemployed after graduation affects employment chances and also future wages negatively, other research, however, did not find such scarring effects. Some of this mixed evidence may be due to the different ways in which data were collected. Evaluating the effects of potentially stigmatizing applicant characteristics on hiring chances, such as previous unemployment spells, is known to be prone to social desirability bias. Factorial survey experiments (FSE) and forced choice experiments (FCE) have been suggested to alleviate some of these problems. In this workshop contribution, we gauge the capability of FSE and FCE to estimate effects of early career unemployment spells on recruiters’ hiring decisions. Using data obtained from a survey with sequentially implemented FSE and FCE with 2000 recruiters in Bulgaria, Greece, Norway, and Switzerland we compare FSE and FCE using multilevel linear regression models and multilevel probit models with random effects. Our preliminary results suggest that FCE may be better suited to gather valid data with minimal social desirability bias. [less ▲]

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See detailSocial and Economic Inclusion
Limbach-Reich, Arthur UL; Nonthasoot, Seree

Scientific Conference (2016, November 09)

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See detailResearch on ‘Youth in Action’ projects in Luxembourg: the variety of learning effects on participants
Meyers, Christiane UL

Scientific Conference (2016, November 08)

The European Union promotes young people's mobility since a lot of years by specific programmes. In the area of non-formal activities, the Youth in Action programme supports individual mobility activities ... [more ▼]

The European Union promotes young people's mobility since a lot of years by specific programmes. In the area of non-formal activities, the Youth in Action programme supports individual mobility activities as well as group mobility of young persons and youth workers. Although the programme is very successful, there existed not much knowledge about the effects of the projects on participants and project leaders. Therefore, in 2008 a small group of countries founded the RAY network - 'Research-based analysis and monitoring of Youth in action' – which has expanded since then and comprises today 31 countries. Its goal is to permanently gather and analyse data on the processes and outcomes of the YiA programme and its successor programme. Luxembourg joined the RAY network in 2010 and participated from 2011 to 2014 in 6 surveys in the framework of the YiA programme. During this time about 589 project participants and 252 project leaders answered the online questionnaires, which were sent to them some time after the end of the activity. In addition to the quantitative survey, a qualitative study on the effects of non-formal learning in the projects was realised in 2012/2013. In my presentation I want to show some of the results found in Luxembourg. Among other things, I will present a factor analysis on the competences, skills and attitudes developed by the participants and show how different project types can influence these effects. [less ▲]

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See detailCrossing the borders of domains. The role of complex problem solving for student learning
Scherer, Ronny; Greiff, Samuel UL

Scientific Conference (2016, November 08)

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See detailStrongly barycentrically associative and preassociative functions
Teheux, Bruno UL; Marichal, Jean-Luc UL

Scientific Conference (2016, November 08)

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See detailA real-time holding decision rule accounting for passenger travel cost
Laskaris, Georgios UL; Cats, Oded; Jenelius, Erik et al

Scientific Conference (2016, November 04)

Holding has been extensively investigated as a strategy to mitigate the inherently stochastic nature of public transport operations. Holding focuses on either regulating vehicle headways using a rule ... [more ▼]

Holding has been extensively investigated as a strategy to mitigate the inherently stochastic nature of public transport operations. Holding focuses on either regulating vehicle headways using a rule-based approach or minimizing passenger travel cost by employing optimization models. This paper introduces a holding decision rule that explicitly addresses passenger travel cost. The decision to hold relies on the passenger demand distribution along the line. The passenger cost holding rule is tested using simulation for a high frequency bus line in Stockholm, Sweden and is compared with a nocontrol scheme and the currently used headway-based strategy. The results indicate that the new decision rule results in relatively minor reductions of passenger cost compared to the currently adopted strategy, and that it allocates the greatest share of holding time at the beginning of the route. [less ▲]

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See detailComputing linear rankings from trillions of pairwise outranking situations
Bisdorff, Raymond UL

Scientific Conference (2016, November)

We present in this paper a sparse HPC implementation for outranking digraphs of huge orders, up to several millions of decision alternatives. The proposed outranking digraph model is based on a quantiles ... [more ▼]

We present in this paper a sparse HPC implementation for outranking digraphs of huge orders, up to several millions of decision alternatives. The proposed outranking digraph model is based on a quantiles equivalence class decomposition of the underlying multicriteria performance tableau. When locally ranking each of these ordered components, we may readily obtain an overall linear ranking of big sets of decision alternatives. For the local rankings, both, Copeland's as well as the Net-Flows ranking rules, appear to give the best compromise between, on the one side, the fitness of the overall ranking with respect to the given global outranking relation and, on the other side, computational tractability for very big outranking digraphs modelling up to several trillions of pairwise outranking situations. [less ▲]

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See detailAutoévaluation des élèves de l'école primaire en mathématiques
Villanyi, Denise UL; Fischbach, Antoine UL; Sonnleitner, Philipp UL et al

Scientific Conference (2016, November)

Detailed reference viewed: 60 (14 UL)
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See detailLanguage ideologies of preschool teachers and translanguaging practices in classrooms.
Kirsch, Claudine UL; Bes Izuel, Maria Asuncion UL

Scientific Conference (2016, November)

Translanguaging has been described as a natural practice amongst multilinguals although it remains uncommon in formal and informal educational institutions (Creese & Blackledge 2010). By contrast, Kirsch ... [more ▼]

Translanguaging has been described as a natural practice amongst multilinguals although it remains uncommon in formal and informal educational institutions (Creese & Blackledge 2010). By contrast, Kirsch (forthcoming) has shown that preschool children in trilingual Luxembourg translanguaged frequently during collaborative storytelling on iTEO, an iPad app which allows for the recording and editing of oral language. The 4-year-old emergent multilinguals studied here drew on their entire semiotic repertoire in order to communicate and to make meaning. They used Luxembourgish, their family language and features of other languages picked up from their peers. In order to understand these translanguaging practices, we consider it necessary to examine the underlying pedagogies which are, in turn, influenced by the language ideologies of the teachers (Gkaintartzi & Tsokalidou 2010). The present paper examines the language ideologies of two preschool teachers in Luxembourg and relates them to the translanguaging practices in their classrooms. The data stem from the qualitative, small-scale, longitudinal study iTEO (2013 – 2017) which used a mix-method approach comprising video and audio recordings, interviews, questionnaires and the collection of documents (e.g. written stories, pictures). The data show that the teachers understand language learning as a dynamic social process and have positive attitudes to multilingualism. They embrace language and cultural diversity in their classroom, promote translanguaging, and actively collaborate with parents in order to communicate and share their language practices. [less ▲]

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See detailMultilingualism in Language Classes for Refugees in Luxembourg: Second Language Teaching or Repertoire Building?
Kalocsanyiova, Erika UL

Scientific Conference (2016, October 22)

Official trilingualism is often drawn upon to portray Luxembourg as a heterogeneous society with high levels of linguistic capital, where multilingualism is declared to be an asset both at individual and ... [more ▼]

Official trilingualism is often drawn upon to portray Luxembourg as a heterogeneous society with high levels of linguistic capital, where multilingualism is declared to be an asset both at individual and societal level. With the increased number and shifted geographic origin of migrants from refugee backgrounds new questions surface concerning the linguistic integration of these new arrivals, who are often incorrectly associated with zerolingualism and whose language capital is seldom perceived as a valuable asset. It has been argued that in contexts of forced migration one cannot talk of second or foreign language learning: migrants are not acquiring the language(s) of the mainstream society for the mere reason of approximating native speakers’ performances; these languages form part of their everyday lived experiences, hence they have to appropriate features that best suit their needs. Accordingly, their full linguistic repertoires constitute single integrated continua that include all the language resources they have learned and accumulated. In line with this and contesting the idea of zerolingualism, we maintain that through a wide variety of trajectories ranging from comprehensive learning to informal encounters with languages, migrants from refugee backgrounds have developed partial, truncated competences in several languages that have resulted in complex linguistic repertoires. Our contribution aims at investigating whether the recognition of multilingualism in Luxembourg entails the acknowledgment of the refugees’ full linguistic repertoires, or on the contrary, it remains limited to the appreciation of official trilingualism and proficiency in standard English. In our analysis we are going to rely on data collected in the context of a French language course for beginners, which is offered to newly arrived migrants by volunteer teachers. Besides commenting on the presence (or absence) of multilingual approaches, we seek to explore whether migrant language features are acknowledged as useful resources and how, if at all, the class draws on the fluid use of all the languages present for both learning and functional purposes. On this note, we aim to determine what is more prominent in this context: the monoglossic perspective where languages are conceived in a linear and compartmentalised way or a repertoire-building approach based on awareness and positive attitudes towards teachers’ and learners’ multilingual repertoires. [less ▲]

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See detailViolence féminine dans la prévôté de Luxembourg entre 1520 et 1630
Leuck, Jessica UL

Scientific Conference (2016, October 21)

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See detailForced Answering in Online Surveys: Is it really a reactance effect that reduces data quality?
Sischka, Philipp UL; Mergener, Alexandra; Neufang, Kristina Marliese et al

Scientific Conference (2016, October 14)

Online surveys are conducted without adequate attention to implementation details too often. One example is the frequent use of the forced answering (FA) option, which forces the respondent to answer ... [more ▼]

Online surveys are conducted without adequate attention to implementation details too often. One example is the frequent use of the forced answering (FA) option, which forces the respondent to answer questions in order to proceed through the questionnaire. Currently, only a few studies have researched the impact of FA on different quality parameters. Some studies that evaluated the influence of FA on quality parameters (e.g. drop-out or answer quality) hypothesized that FA leads to reactance in the participants indicated by a higher drop-out-rate as well as lower answer quality. However, no study researched the psychological mechanism behind the correlation of FA on dropout and data quality before. Psychological Reactance Theory predicts that reactance appears when an individual’s freedom is threatened and cannot be directly restored. Reactance describes the motivation to restore this loss of freedom. Respondents could experience FA as a loss of freedom, as (s)he is denied the choice to leave a question unanswered. According to Reactance Theory possible reactions in this situation might be to quit survey participation or to fake answers. This study examines the psychological mechanism that explains higher amounts of dropout and faking behavior in FA condition (compared to non-FA- condition). Our major hypothesis is that forcing respondents to answer will cause reactance, which turns into increasing dropout rates and decreasing answer quality. We used split-ballot-field-experiments with a forced and non-forced answering instruction. Reactance was measured with a four-item reactance scale. To determine answer quality, we used self-report for faking. Our Mediation analysis shows that respondents in FA condition report higher amounts of reactance compared to respondents in non-FA condition. In addition to that reactance also is a strong predictor for dropout behavior, faking, or re-participation. Therefore, the influence of FA on quality parameters is mediated through reactance. [less ▲]

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See detailEinblicke in die Sprachideologien und Praktiken von Fachkräften in formalen und non-formalen Einrichtungen in Luxemburg
Kirsch, Claudine UL; Andersen, Katja Natalie UL; Mortini, Simone UL et al

Scientific Conference (2016, October 13)

Programme zur Förderung von alltagsintegrierter Mehrsprachigkeit in Kindertagesbetreuungen und Vorschulen sind selten. Das seit Mai 2016 laufende Forschungsprojekt MuLiPEC fokussiert die Entwicklung ... [more ▼]

Programme zur Förderung von alltagsintegrierter Mehrsprachigkeit in Kindertagesbetreuungen und Vorschulen sind selten. Das seit Mai 2016 laufende Forschungsprojekt MuLiPEC fokussiert die Entwicklung multilingualer Sprachpraktiken von Kindern im Alter von drei bis sechs Jahren sowie die zugrunde liegende Pädagogik im formalen und non-formalen Sektor der frühkindlichen Bildung. Für unsere Forschung ist von besonderem Interesse, die Beziehung zwischen den Sprachideologien der Erzieher/innen und Lehrer/innen und deren pädagogischen Handeln zu hinterfragen und die Reflexion über die Sprachpraktiken im Rahmen einer Weiterbildung und Forschungstreffen zu explizieren. Die Studie widmet sich der Analyse der Ideologien und Praktiken sowie der Effizienz unserer Weiterbildung zur Entwicklung einer mehrsprachigen Pädagogik. Im Vortrag werden der Aufbau des Forschungsprojektes mitsamt der besonderen Sprachensituation in Luxemburg sowie der dem Projekt zugrunde liegenden Weiterbildung vorgestellt und erste Einblicke in Sprachideologien der Fachkräfte gegeben. [less ▲]

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