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See detailA demolinguistic and sociolinguistic approach to English in Luxembourg
Fehlen, Fernand UL; Heinz, Andreas UL

Presentation (2017, June 09)

Luxembourg’s steadily growing economy attracts many migrants from all over the globe. As a result, the country’s trilingualism is being replaced by a more complex multilingualism with a growing importance ... [more ▼]

Luxembourg’s steadily growing economy attracts many migrants from all over the globe. As a result, the country’s trilingualism is being replaced by a more complex multilingualism with a growing importance of English. The paper gives a quick overview of the historic evolution based on sociolinguistic surveys of 1984, 1997 and 2008, followed by an in-depth description of today’s situation based on two language related questions of the Luxembourgish census 2011: Which language do you know the best? Which languages do you speak on a regular basis at home, at school and at work? The census data tell how many people use English in different contexts and who these people are. The focus will be on the language situation at work. A correspondence analysis reveals strong correlations between languages and occupations reflecting a split of the labour market: English dominates in high skilled jobs in the private sector, whereas Portuguese is the main language in low skilled jobs in the private sector, and Luxembourgish is the main language in the public sector. French and German are used more evenly across all occupations and sectors. These results highlight the link between the use of languages and competing social positions. [less ▲]

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See detailCross-border mergers and acquisitions: Evidence from the Indochina region
Wolff, Christian UL

in Finance Research Letters (2017)

We study cross-border mergers and acquisitions (M&As) in ten countries in the Indochina region during the period 1993–2015. Countries with a French colonial history showed markedly lower levels of cross ... [more ▼]

We study cross-border mergers and acquisitions (M&As) in ten countries in the Indochina region during the period 1993–2015. Countries with a French colonial history showed markedly lower levels of cross-border M&As (value as well as volume) than other countries, whether previously colonized or not. This difference persists even after accounting for the known drivers of cross-border M&A activity, including legal origin, trade openness, and labor cost levels. Together, these findings suggest that the colonial past of a country plays an important role in cross-border M&A activity. [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 detailLe bibliothécaire du Grand-Duc, entre farce et tragédie
Scuto, Denis UL

Article for general public (2017)

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See detailCross-border mergers and acquisitions: Evidence from Indochina
Wolff, Christian UL

E-print/Working paper (2017)

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See detailImmigrazione: un peso oppure una benedizione per i paesi europei?
Zanaj, Skerdilajda UL; Joxhe, Majlinda UL

Article for general public (2017)

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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 detailState of the Art in Lightweight Symmetric Cryptography
Biryukov, Alex UL; Perrin, Léo Paul UL

E-print/Working paper (2017)

Lightweight cryptography has been one of the ``hot topics'' in symmetric cryptography in the recent years. A huge number of lightweight algorithms have been published, standardized and/or used in ... [more ▼]

Lightweight cryptography has been one of the ``hot topics'' in symmetric cryptography in the recent years. A huge number of lightweight algorithms have been published, standardized and/or used in commercial products. In this paper, we discuss the different implementation constraints that a ``lightweight'' algorithm is usually designed to satisfy. We also present an extensive survey of all lightweight symmetric primitives we are aware of. It covers designs from the academic community, from government agencies and proprietary algorithms which were reverse-engineered or leaked. Relevant national (\nist{}...) and international (\textsc{iso/iec}...) standards are listed. We then discuss some trends we identified in the design of lightweight algorithms, namely the designers' preference for \arx{}-based and bitsliced-S-Box-based designs and simple key schedules. Finally, we argue that lightweight cryptography is too large a field and that it should be split into two related but distinct areas: \emph{ultra-lightweight} and \emph{IoT} cryptography. The former deals only with the smallest of devices for which a lower security level may be justified by the very harsh design constraints. The latter corresponds to low-power embedded processors for which the \aes{} and modern hash function are costly but which have to provide a high level security due to their greater connectivity. [less ▲]

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See detailSpectrum Sharing in Hybrid Terrestrial-Satellite Backhaul Networks in the Ka Band
Artiga, Xavier; Vázquez, Miguel Ángel; Pérez-Neira, Ana et al

in European Conference on Networks and Communications (EuCNC), June 2017 (2017, June)

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See detailPainful decisions: How classifying sensations can change the experience of pain
Van Der Meulen, Marian UL; Anton, Fernand UL; Petersen, Sibylle UL

in European Journal of Pain (London, England) (2017)

Background: Categorizing perceptual stimuli is a mechanism for facilitating the processing of sensory input from our environment. This facilitation of perception is achieved through generalization ... [more ▼]

Background: Categorizing perceptual stimuli is a mechanism for facilitating the processing of sensory input from our environment. This facilitation of perception is achieved through generalization (assimilation) of stimulus characteristics within categories and accentuation between categories. These categorization processes have been demonstrated in visual, auditory, tactile and social perception, but never in pain perception. Method: We presented participants with six thermal noxious stimuli, increasing in steps of 0.5 °C. In an experimental group, stimuli were assigned to two categories labelled A and B containing the three lower (A1, A2, A3) and three higher (B1, B2, B3) stimuli. A control group did not receive such category information (stimuli were labelled S1–S6). In a first part of the experiment, participants simply rated pain intensity and unpleasantness for all stimuli. In a second part, we presented stimuli without labels and participants had to identify the label of each stimulus. Results: We found evidence for categorization effects in both pain ratings and stimulus identification data. In particular, unpleasantness ratings within categories were more similar to each other, and ratings between categories less similar, in the experimental compared to control group. Participants in the experimental group also confused stimuli more often within than between categories, and were more confident about category membership of stimuli at the category border, compared to participants in the control group. Conclusions: Mere category information, using abstract category labels, significantly changes pain perception. Implications for our understanding of cognitive pain modulation mechanisms, as well as clinical implications of categorization effects are discussed. Significance: Categorization effects in pain perception are demonstrated. Classifying and labelling painful events can modulate early perceptual processes, lead to under- or overestimation of pain symptoms and affect decision-making behaviour related to pain. [less ▲]

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See detailDistributed methods for synchronization of orthogonal matrices over graphs
Thunberg, Johan UL; Bernard, Florian UL; Goncalves, Jorge UL

in Automatica (2017), 80

This paper addresses the problem of synchronizing orthogonal matrices over directed graphs. For synchronized transformations (or matrices), composite transformations over loops equal the identity. We ... [more ▼]

This paper addresses the problem of synchronizing orthogonal matrices over directed graphs. For synchronized transformations (or matrices), composite transformations over loops equal the identity. We formulate the synchronization problem as a least-squares optimization problem with nonlinear constraints. The synchronization problem appears as one of the key components in applications ranging from 3D-localization to image registration. The main contributions of this work can be summarized as the introduction of two novel algorithms; one for symmetric graphs and one for graphs that are possibly asymmetric. Under general conditions, the former has guaranteed convergence to the solution of a spectral relaxation to the synchronization problem. The latter is stable for small step sizes when the graph is quasi-strongly connected. The proposed methods are verified in numerical simulations. [less ▲]

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See detailDevelopment and validation of a survey instrument for detecting basic motor competencies in elementary school children
Scheuer, Claude; Bund, Andreas UL; Becker, Werner et al

in Cogent Education (2017)

Basic motor competencies (in German: Motorische Basiskompetenzen; MOBAK) are motor performance dispositions formulated as minimum standards that empower children to participate in the culture of human ... [more ▼]

Basic motor competencies (in German: Motorische Basiskompetenzen; MOBAK) are motor performance dispositions formulated as minimum standards that empower children to participate in the culture of human movement. In opposition to movement-specific and process-oriented fundamental movement skills assessing the quality of movement execution, basic motor competencies are context-specific and product-oriented and focus on the mastery of minimum motor demands. Consequently, the promotion of basic motor competencies is a central goal of physical education, as they are essential prerequisites to be able to develop a physically active lifestyle. For the diagnosis of basic motor competencies, teachers need valid survey instruments that can help them to adapt their didactic-methodical action. For this purpose, a test battery for the assessment of the basic motor competencies of third graders was developed (MOBAK-3) and subjected to empirical validation (N = 399; 50.4% female; M = 8.45 years, SD = .52). The exploratory structural equation modeling indicates a structure with three factors named “Locomotion,” “Object-control” and “Moving in water”. This structure could be confirmed in the confirmatory factor analysis (CFI = .998; RMSEA = .009) [less ▲]

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See detailOn idempotent discrete uninorms
Couceiro, Miguel; Devillet, Jimmy UL; Marichal, Jean-Luc UL

in De Baets, Bernard; Torra, Vicenç; Mesiar, Radko (Eds.) Aggregation Functions in Theory and in Practice (2017, June)

In this paper we provide two axiomatizations of the class of idempotent discrete uninorms as conservative binary operations, where an operation is conservative if it always outputs one of its input values ... [more ▼]

In this paper we provide two axiomatizations of the class of idempotent discrete uninorms as conservative binary operations, where an operation is conservative if it always outputs one of its input values. More precisely we first show that the idempotent discrete uninorms are exactly those operations that are conservative, symmetric, and nondecreasing in each variable. Then we show that, in this characterization, symmetry can be replaced with both bisymmetry and existence of a neutral element. [less ▲]

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See detailDigital health in ambulatory assessment
Vögele, Claus UL

Book published by INSIDE (2017)

In this volume all accepted contributions to the 5th Biennial Conference of the Society for Ambulatory Assessment are published. The number and quality of these contributions testify to the high standard ... [more ▼]

In this volume all accepted contributions to the 5th Biennial Conference of the Society for Ambulatory Assessment are published. The number and quality of these contributions testify to the high standard of international research in ambulatory monitoring, the rapid advances in technology and data handling supporting ambulatory assessment, and the importance of these developments for the rapidly expanding area of Digital Health. Converging technologies such as Internet applications, social networks, smartphones and wearable sensors in the area of health, are now beginning to transform our approach to health research, healthcare, and communication and access to information. [less ▲]

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See detailExperience-based guidelines for effective and efficient data extraction in systematic reviews in software engineering
Garousi, Vahid UL; Felderer, Michael

in Proceedings of International Conference on Evaluation and Assessment in Software Engineering (EASE) (2017, June)

To systematically collect evidence and to structure a given area in software engineering (SE), Systematic Literature Reviews (SLR) and Systematic Mapping (SM) studies have become common. Data extraction ... [more ▼]

To systematically collect evidence and to structure a given area in software engineering (SE), Systematic Literature Reviews (SLR) and Systematic Mapping (SM) studies have become common. Data extraction is one of the main phases (activities) when conducting an SM or an SLR, whose objective is to extract required data from the primary studies and to accurately record the information researchers need to answer the questions of the SM/SLR study. Based on experience in a large number of SM/SLR studies, we and many other researchers have found the data extraction in SLRs to be time consuming and error-prone, thus raising the real need for heuristics and guidelines for effective and efficient data extraction in these studies, especially to be learnt by junior and young researchers. As a ‘guideline’ paper, this paper contributes a synthesized list of challenges usually faced during SLRs’ data extraction phase and the corresponding solutions (guidelines). For our synthesis, we consider two data sources: (1) the pool of 16 SLR studies in which the authors have been involved in, as well as (2) a review of challenges and guidelines in the existing literature. Our experience in utilizing the presented guidelines in the near past have helped our junior colleagues to conduct data extractions more effectively and efficiently. [less ▲]

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