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See detailLow Complexity Symbol-Level Design for Linear Precoding Systems
Krivochiza, Jevgenij UL; Kalantari, Ashkan UL; Chatzinotas, Symeon UL et al

in Heusdens, Richard; Weber, Jos H. (Eds.) PROCEEDINGS of the 2017 Symposium on Information Theory and Signal Processing in the Benelux (2017, May 11)

The practical utilization of the symbol-level precoding in MIMO systems is challenging since the implementation of the sophisticated optimization algorithms must be done with reasonable computational ... [more ▼]

The practical utilization of the symbol-level precoding in MIMO systems is challenging since the implementation of the sophisticated optimization algorithms must be done with reasonable computational resources. In the real implementation of MIMO precoding systems, the processing time for each set of symbols is a crucial parameter, especially in the high-throughput mode. In this work, a symbol-level optimization algorithm with reduced complexity is devised. Performance of a symbol-level precoder is shown to improve in terms of the processing times per set of symbols. [less ▲]

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See detailLuxemburg und der Studiengang der Sozialen Arbeit
Böwen, Petra UL; Dujardin, Céline UL; Straus, Liz UL

Poster (2017, May 10)

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See detailChronic Social Stress Time-Dependently Affects Neuropathic Pain-Related Cold Allodynia and Leads to Altered Expression of Spinal Biochemical Mediators
Le Coz, Glenn Marie; Genty, Julien UL; Anton, Fernand UL et al

in Frontiers in Behavioral Neuroscience (2017), 11

Clinical data have shown that chronic exposure to stress may be accompanied by an enhancement of inflammation-related pain sensitivity. In this context, little is however known on the impact of stress on ... [more ▼]

Clinical data have shown that chronic exposure to stress may be accompanied by an enhancement of inflammation-related pain sensitivity. In this context, little is however known on the impact of stress on neuropathic pain. In the present study we addressed this issue by combining the chronic constriction injury (CCI) model with an ongoing social stress (OSS) paradigm. Cold plate and von Frey tests were performed in 48 rats divided into four groups: OSS exposed to OSS, CCI subjected to chronic nerve constriction, OSS+CCI with a combination of neuropathy and stress and CON, a control group lacking any manipulation. While we did not observe any stress-related differences in mechanical sensitivity throughout the observation period, CCI rats were more sensitive to cold stimulation than OSS+CCI in the initial phase of neuropathy. A switch was observed at a later stage, leading to a hypersensitivity of the OSS+CCI compared to the CCI rats. At this time point we investigated the spinal mRNA expression of neuron and glia related molecules potentially involved in neuropathic pain and stress. The combination of psychosocial stress and neuropathic pain seemed to enhance glial cell activation, pro-inflammatory cytokine and neurotrophic factor mRNA levels, rather than glutamatergic transmission. Our data show that long lasting social stress may lead to time-dependent alteration of neuropathy-related cold pain sensitivity while mechanicallyinduced pain remains unchanged. [less ▲]

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See detailChiral Nematic Liquid Crystal Microlenses
Popov, Piotr; Honaker, Lawrence William UL; Mirheydari, Mona et al

in Scientific Reports (2017)

Nematic liquid crystals (NLCs) of achiral molecules and racemic mixtures of chiral ones form flat films and show uniform textures between circular polarizers when suspended in sub-millimeter size grids ... [more ▼]

Nematic liquid crystals (NLCs) of achiral molecules and racemic mixtures of chiral ones form flat films and show uniform textures between circular polarizers when suspended in sub-millimeter size grids and immersed in water. On addition of chiral dopants to the liquid crystal, the films exhibit optical textures with concentric ring patterns and radial variation of the birefringence color. Both are related to a biconvex shape of the chiral liquid crystal film; the rings are due to interference. The curvature radii of the biconvex lens array are in the range of a few millimeters. This curvature leads to a radial variation of the optical axis along the plane of the film. Such a Pancharatnam-type phase lens dominates the imaging and explains the measured focal length of about one millimeter. To our knowledge, these are the first spontaneously formed Pancharatnam devices. The unwinding of the helical structure at the grid walls drives the lens shape. The relation between the lens curvature and material properties such as helical pitch, the twist elastic constant, and the interfacial tensions, is derived. This simple, novel method for spontaneously forming microlens arrays can also be used for various sensors. [less ▲]

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See detailImmunities of Heads of State and State Officials for International Crimes
Pichou, Maria UL

Presentation (2017, May 08)

This project explores the issue of immunities of Heads of State and State officials for international crimes before international courts and international criminal tribunals and courts. My presentation ... [more ▼]

This project explores the issue of immunities of Heads of State and State officials for international crimes before international courts and international criminal tribunals and courts. My presentation begins with the Rome Statute provisions and the International Criminal Court’s case law on the issue; it then turns to the jurisprudence of the international criminal tribunals and specialised, internationalised, hybrid courts, in an attempt to provide a concise but as far as possible comprehensive analysis; it proceeds with an analysis under public international law and the International Court of Justice (hereinafter ‘ICJ’) case law. As the question of immunities is currently under review at the International Law Commission (hereinafter ‘ILC’), an analysis of the ILC Reports thus far is included. Finally, the project will address the question of how national courts and national law have dealt with Article 27 of the Rome Statute [less ▲]

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See detailErythritol is a pentose-phosphate pathway metabolite and associated with adiposity gain in young adults
Hootman, Katie C.; Trezzi, Jean-Pierre UL; Kraemer, Lisa UL et al

in Proceedings of the National Academy of Sciences of the United States of America (2017)

Metabolomic markers associated with incident central adiposity gain were investigated in young adults. In a 9-mo prospective study of university freshmen (n = 264). Blood samples and anthropometry ... [more ▼]

Metabolomic markers associated with incident central adiposity gain were investigated in young adults. In a 9-mo prospective study of university freshmen (n = 264). Blood samples and anthropometry measurements were collected in the first 3 d on campus and at the end of the year. Plasma from individuals was pooled by phenotype [incident central adiposity, stable adiposity, baseline hemoglobin A1c (HbA1c) > 5.05%, HbA1c < 4.92%] and assayed using GC-MS, chromatograms were analyzed using MetaboliteDetector software, and normalized metabolite levels were compared using Welch’s t test. Assays were repeated using freshly prepared pools, and statistically significant metabolites were quantified in a targeted GC-MS approach. Isotope tracer studies were performed to determine if the potential marker was an endogenous human metabolite in men and in whole blood. Participants with incident central adiposity gain had statistically significantly higher blood erythritol [P < 0.001, false discovery rate (FDR) = 0.0435], and the targeted assay revealed 15-fold [95% confidence interval (CI): 13.27, 16.25] higher blood erythritol compared with participants with stable adiposity. Participants with baseline HbA1c > 5.05% had 21-fold (95% CI: 19.84, 21.41) higher blood erythritol compared with participants with lower HbA1c (P < 0.001, FDR = 0.00016). Erythritol was shown to be synthesized endogenously from glucose via the pentose-phosphate pathway (PPP) in stable isotope-assisted ex vivo blood incubation experiments and through in vivo conversion of erythritol to erythronate in stable isotope-assisted dried blood spot experiments. Therefore, endogenous production of erythritol from glucose may contribute to the association between erythritol and obesity observed in young adults. [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 detailOwnership structure and investment-cash flow sensitivity
Derouiche, Imen UL

in Journal of Management & Governance (2017)

This study investigates the effect of ownership structure on the use of cash flow in financing corporate investments—the investment-cash flow sensitivity—in a concentrated ownership context. Using a ... [more ▼]

This study investigates the effect of ownership structure on the use of cash flow in financing corporate investments—the investment-cash flow sensitivity—in a concentrated ownership context. Using a sample of 6797 French listed firms from 2000 to 2013, results show that investment-cash flow sensitivity decreases with the cash-flow rights of the controlling shareholder and increases with the separation of its cash-flow and control rights (excess control rights). Firms are, thus, less likely to use cash flow in investments when the interests of controlling shareholders are aligned with those of minority shareholders. However, they appear to use considerable internal funds for their investments when they have severe agency problems, driven by excess control rights of the controlling shareholders. Overall, our findings help advance the understanding of the role of agency relationship in shaping corporate financial policy. [less ▲]

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See detailGesundheitsverhalten von Arbeitnehmern in Luxemburg
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2017)

Insbesonders unter den jüngeren Arbeitnehmern und unter den Arbeitnehmern mit geringer Bildung ist der Anteil der Raucher vergleichsweise hoch. Männliche und ältere Arbeitnehmer weisen wieder einen ... [more ▼]

Insbesonders unter den jüngeren Arbeitnehmern und unter den Arbeitnehmern mit geringer Bildung ist der Anteil der Raucher vergleichsweise hoch. Männliche und ältere Arbeitnehmer weisen wieder einen vergleichsweise hohen Alkoholkonsum auf. Differenziert nach Berufsgruppen zeigen vor allem Arbeitnehmer in Handwerksberufen sowie Manager und Führungskräfte einen hohen Alkoholkonsum. Die Arbeitnehmer in der jüngsten Altersgruppe (16 bis 24 Jährige) schlafen durchschnittlich etwas länger, im Vergleich zu den älteren Arbeitnehmern. Außerdem ist die Sporthäufigkeit in der jüngsten Altersgruppe am höchsten. Männliche Arbeitnehmer sowie Arbeitnehmer ohne Partner oder ohne Kinder treiben ebenfalls überduchschnittlich häufig Sport. Etwa 17% der Arbeitnehmer leidet unter Adipositas. Knapp 30% der Arbeitnehmer leidet manchmal oder häufiger an gesundheitlichen Problemen. Unter den gesundheitlichen Problemen sind Rückenprobleme besonders häufig, gefolgt von Schlafschwierigkeiten und Kopfschmerzen. Herzprobleme sind dagegen eher selten ausgeprägt. Arbeitnehmer mit Hochschulabschluss sowie Manager und Führungskräfte sind seltener von Gesundheitsproblemen betroffen. Gesundheitliche Probleme sind insgesamt mit Zigarettenkonsum, Schlafstunden pro Tag, Sporthäufigkeit und Body Mass Index assoziiert: Je weniger geraucht wird, je mehr geschlafen und Sport getrieben wird und je geringer das körperliche Gewicht der Arbeitnehmer, desto weniger Gesundheitsprobleme liegen tendenziell vor. [less ▲]

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See detailAlgorithmic Decision Theory for solving complex decision problems
Bisdorff, Raymond UL

Presentation (2017, May 03)

Today's decision makers in fields ranging from engineering to psychology, from medicine to economics and/or homeland security are faced with remarkable new technologies, huge amounts of information to ... [more ▼]

Today's decision makers in fields ranging from engineering to psychology, from medicine to economics and/or homeland security are faced with remarkable new technologies, huge amounts of information to help them in reaching good decisions, and the ability to share information at unprecedented speeds and quantities. These tools and resources should lead to better decisions. Yet, the tools bring with them daunting new problems: the massive amounts of data available are often incomplete, unreliable and/or distributed and there is great uncertainty in them; interoperating/distributed decision makers and decision making devices need to be coordinated; many sources of data need to be fused into a good decision; information sharing under new cooperation/competition arrangements raises security problems. When faced with such issues, there are few highly efficient algorithms available to support decision makers. The objective of Algorithmic Decision Theory (ADT) is to improve the ability of decision makers to perform well when facing these new challenges and problems through the use of methods from theoretical computer science, in particular algorithmic methods. The primary goal of ADT is hence to explore and develop algorithmic approaches for solving decision problems arising in a variety of applications areas. Examples include, but are not limited to: - Computational tractability/intractability of social consensus and multiple criteria compromise functions; - Improvement of decision support and recommender systems; - Development of automatic decision devices including on-line decision procedures; - Robust decision making; - Learning for multi-agent systems and other on-line decision devices. This presentation will focus more specifically on multiple criteria decision aiding methodology, the actual research field of the author. [less ▲]

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See detailMathematical abilities in elementary school: Do they relate to number–space associations?
Georges, Carrie UL; Hoffmann, Danielle UL; Schiltz, Christine UL

in Journal of Experimental Child Psychology (2017)

Considering the importance of mathematics in Western societies, it is crucial to understand the cognitive processes involved in the acquisition of more complex mathematical skills. The current study ... [more ▼]

Considering the importance of mathematics in Western societies, it is crucial to understand the cognitive processes involved in the acquisition of more complex mathematical skills. The current study, therefore, investigated how the quality of number–space mappings on the mental number line, as indexed by the parity SNARC (spatial–numerical association of response codes) effect, relates to mathematical performances in third- and fourth-grade elementary school children. Mathematical competencies were determined using the “Heidelberger Rechentest,” a standardized German math test assessing both arithmetical and visuospatial math components. Stronger parity SNARC effects significantly related to better arithmetical but not visuospatial math abilities, albeit only in the relatively younger children. These findings highlight the importance of spatial–numerical interactions for arithmetical (as opposed to visuospatial) math skills at the fairly early stages of mathematical development. Differential relations might be explained by the reliance on problem-solving strategies involving number–space mappings only for arithmetic tasks mainly in younger children. [less ▲]

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See detailOn the Diversity of Partial Relaying Cooperation with Relay Selection in Finite-SNR Regime
Vu, Thang Xuan UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in IEEE International Conference on Communications (2017, May)

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

Scientific Conference (2017, May)

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See detailBrexit: Mind the gap! Die Bedeutung regionaler Disparitäten auf politische Weichenstellungen
Bissinger, Jutta UL; Evrard, Estelle UL

Article for general public (2017)

Die Ergebnisse des Referendums am 23. Juni 2016 im Vereinigten Königreich (VK) sind ein Beweis dafür, dass regionale Disparitäten und der territoriale Zusammenhalt innerhalb eines Landes politisch ... [more ▼]

Die Ergebnisse des Referendums am 23. Juni 2016 im Vereinigten Königreich (VK) sind ein Beweis dafür, dass regionale Disparitäten und der territoriale Zusammenhalt innerhalb eines Landes politisch relevante Faktoren darstellen [less ▲]

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See detailSpectral-Efficient Model for Multiuser Massive MIMO: Exploiting User Velocity
Vu, Thang Xuan UL; Trinh, Anh Vu; Chatzinotas, Symeon UL et al

in IEEE international Conference on Communications (2017, May)

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See detailColonization and Succession within the Human Gut Microbiome by Archaea, Bacteria, and Microeukaryotes during the First Year of Life
Wampach, Linda UL; Heintz, Anna UL; Hogan, Angela et al

in Frontiers in Microbiology (2017)

Perturbations to the colonization process of the human gastrointestinal tract have been suggested to result in adverse health effects later in life. Although much research has been performed on bacterial ... [more ▼]

Perturbations to the colonization process of the human gastrointestinal tract have been suggested to result in adverse health effects later in life. Although much research has been performed on bacterial colonization and succession, much less is known about the other two domains of life, archaea, and eukaryotes. Here we describe colonization and succession by bacteria, archaea and microeukaryotes during the first year of life (samples collected around days 1, 3, 5, 28, 150, and 365) within the gastrointestinal tract of infants delivered either vaginally or by cesarean section and using a combination of quantitative real-time PCR as well as 16S and 18S rRNA gene amplicon sequencing. Sequences from organisms belonging to all three domains of life were detectable in all of the collected meconium samples. The microeukaryotic community composition fluctuated strongly over time and early diversification was delayed in infants receiving formula milk. Cesarean section-delivered (CSD) infants experienced a delay in colonization and succession, which was observed for all three domains of life. Shifts in prokaryotic succession in CSD infants compared to vaginally delivered (VD) infants were apparent as early as days 3 and 5, which were characterized by increased relative abundances of the genera Streptococcus and Staphylococcus, and a decrease in relative abundance for the genera Bifidobacterium and Bacteroides. Generally, a depletion in Bacteroidetes was detected as early as day 5 postpartum in CSD infants, causing a significantly increased Firmicutes/Bacteroidetes ratio between days 5 and 150 when compared to VD infants. Although the delivery mode appeared to have the strongest influence on differences between the infants, other factors such as a younger gestational age or maternal antibiotics intake likely contributed to the observed patterns as well. Our findings complement previous observations of a delay in colonization and succession of CSD infants, which affects not only bacteria but also archaea and microeukaryotes. This further highlights the need for resolving bacterial, archaeal, and microeukaryotic dynamics in future longitudinal studies of microbial colonization and succession within the neonatal gastrointestinal tract. [less ▲]

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See detailLa fourniture transfrontalière de services bancaires et financiers après Brexit
Voordeckers, Olivier UL

in Revue internationale des services financiers (2017), 2017(1), 76-83

This article analyses the legal possibilities for banks incorporated in the United Kingdom to have access to the single market for financial services after Brexit.

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See detailLa mutation de la fonction parlementaire: le rôle des parlements dans la gouvernance économique
Allemand, Frederic UL; Martucci, Francesco

in Auby, Jean-Bernard; Idoux, Pascale (Eds.) Le Gouvernement économique européen (2017)

Placé au centre des préoccupations à la faveur des crises qui ont révélé ses insuffisances, le gouvernement économique européen demeure, en dépit des avancées récentes, un terrain évolutif encore ... [more ▼]

Placé au centre des préoccupations à la faveur des crises qui ont révélé ses insuffisances, le gouvernement économique européen demeure, en dépit des avancées récentes, un terrain évolutif encore largement en friche, propice à un travail interdisciplinaire de réflexion sur l’existant et d’invention de futurs développements, auquel la communauté des juristes doit prendre part et qu’elle doit s’efforcer d’enrichir par sa diversité. À cet égard, le présent ouvrage, loin de prétendre épuiser le sujet, se présente à la fois comme une ébauche et une invitation. Sa première partie s’interroge sur le principe même d’un gouvernement économique européen, afin de tenter d’apporter quelques réponses à la question de savoir ce qui fait en éprouver la nécessité dans un contexte juridique et politique qui repose fondamentalement sur une confiance dans le marché. La deuxième partie s’efforce de cerner ce qu’est le gouvernement économique européen, dans son état actuel, tel qu’il résulte notamment des inflexions et ajouts divers que la crise a conduit à lui apporter, sous l’angle des institutions, des principes et des méthodes de pilotage public de l’économie. Enfin, la troisième partie propose des hypothèses sur les perspectives d’évolution envisageables à ces trois égards. [less ▲]

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