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See detailQuasicircles and width of Jordan curves in CP1
bonsante, francesco; danciger, jeffrey; maloni, sara et al

E-print/Working paper (2019)

We study a notion of "width" for Jordan curves in CP1, paying special attention to the class of quasicircles. The width of a Jordan curve is defined in terms of the geometry of its convex hull in ... [more ▼]

We study a notion of "width" for Jordan curves in CP1, paying special attention to the class of quasicircles. The width of a Jordan curve is defined in terms of the geometry of its convex hull in hyperbolic three-space. A similar invariant in the setting of anti de Sitter geometry was used by Bonsante-Schlenker to characterize quasicircles amongst a larger class of Jordan curves in the boundary of anti de Sitter space. By contrast to the AdS setting, we show that there are Jordan curves of bounded width which fail to be quasicircles. However, we show that Jordan curves with small width are quasicircles. [less ▲]

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See detailDual pairs in the Pin-group and duality for the corresponding spinorial representation
Guerin, Clément UL; Liu, Gang; Merino, Allan

E-print/Working paper (2019)

In this paper, we give a complete picture of Howe correspondence for the setting (O(E,b),Pin(E,b),Π), where O(E,b) is an orthogonal group (real or complex), Pin(E,b) is the two-fold Pin-covering of O(E,b ... [more ▼]

In this paper, we give a complete picture of Howe correspondence for the setting (O(E,b),Pin(E,b),Π), where O(E,b) is an orthogonal group (real or complex), Pin(E,b) is the two-fold Pin-covering of O(E,b), and Π is the spinorial representation of Pin(E,b). More precisely, for a dual pair (G,G′) in O(E,b), we determine explicitly the nature of its preimages (G̃,G′~) in Pin(E,b), and prove that apart from some exceptions, (G̃,G′~) is always a dual pair in Pin(E,b); then we establish the Howe correspondence for Π with respect to (G̃,G′~). [less ▲]

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See detailRefining transparency and responsible investment?: The case of EIB and sustainable finance
Alexandraki, Chrysa UL

E-print/Working paper (2019)

On 8 January 2019, an action was brought before the Court of Justice of the European Union (hereafter CJEU) by an environmental law charity, ClientEarth (hereafter applicant) against a multilateral ... [more ▼]

On 8 January 2019, an action was brought before the Court of Justice of the European Union (hereafter CJEU) by an environmental law charity, ClientEarth (hereafter applicant) against a multilateral development bank (hereafter MDB) and European institution, the European Investment Bank (hereafter EIB). The case concerns the financing by the bank of a biomass energy generating project in Northern Spain – Galicia -, of the cost of 60 million euros, followed by the bank’s refusal to refine its decision to finance the aforementioned investment, regardless the applicant’s request for an internal review of this decision on April 2018. The applicant bases the request for an internal review on alleged ‘errors in the assessment of the financing combined with the provision of minimal information regarding the funding decision’. The main claim brought by the applicant involves the annulment of EIB’s refusal to conduct an internal review and subject its decision to scrutiny, as requested under Article 10 of the Aarhus Regulation (hereafter Regulation), bringing into discussion implementation issues of both International and European law. [less ▲]

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See detailThe dual volume of quasi-Fuchsian manifolds and the Weil-Petersson distance
Mazzoli, Filippo UL

E-print/Working paper (2019)

Making use of the dual Bonahon-Schläfli formula, we prove that the dual volume of the convex core of a quasi-Fuchsian manifold M is bounded by an explicit constant, depending only on the topology of M ... [more ▼]

Making use of the dual Bonahon-Schläfli formula, we prove that the dual volume of the convex core of a quasi-Fuchsian manifold M is bounded by an explicit constant, depending only on the topology of M, times the Weil-Petersson distance between the hyperbolic structures on the upper and lower boundary components of the convex core of M. [less ▲]

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See detailRegulating banks for the public? The dilemmas of prudential regulation
Commain, Sébastien UL

E-print/Working paper (2019)

The regulation of banking activities present policymakers with a conundrum: while essential for a healthy and growing economy, they also present important risks of crises that affect all citizens ... [more ▼]

The regulation of banking activities present policymakers with a conundrum: while essential for a healthy and growing economy, they also present important risks of crises that affect all citizens. Prudential regulation is intended to contain the risks while enabling the socially beneficial functions of banks, but the shadow of financial interests influence hangs over the regulatory process. Assessing the reality and extent of this influence, this paper argues, requires first to acquire asound understanding of the social costs and benefits of banking, and the capacity of regulation to promote social welfare. This paper then offers the reader a review of the main issues covered in the literature and suggests some lessons for the study of financial interest groups. [less ▲]

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See detailInsights into protein structural, physicochemical, and functional consequences of missense variants in 1,330 disease-associated human genes 693259
Iqbal, Sumaiya; Jespersen, Jakob B.; Perez-Palma, Eduardo et al

E-print/Working paper (2019)

Inference of the structural and functional consequences of amino acid-altering missense variants is challenging and not yet scalable. Clinical and research applications of the colossal number of ... [more ▼]

Inference of the structural and functional consequences of amino acid-altering missense variants is challenging and not yet scalable. Clinical and research applications of the colossal number of identified missense variants is thus limited. Here we describe the aggregation and analysis of large-scale genomic variation and structural biology data for 1,330 disease-associated genes. Comparing the burden of 40 structural, physicochemical, and functional protein features of altered amino acids with 3-dimensional coordinates, we found 18 and 14 features that are associated with pathogenic and population missense variants, respectively. Separate analyses of variants from 24 protein functional classes revealed novel function-dependent vulnerable features. We then devised a quantitative spectrum, identifying variants with higher pathogenic variant-associated features. Finally, we developed a web resource (MISCAST; http://miscast.broadinstitute.org/) for interactive analysis of variants on linear and tertiary protein structures. The biological impact of missense variants available through the webtool will assist researchers in hypothesizing variant pathogenicity and disease trajectories. [less ▲]

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See detailArbeitsplatzmobbing in Luxemburg - wie groß ist das Problem?
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2019)

Im Rahmen dieser Newsletter werden die aktuellen Prävalenzraten zu Mobbing am Arbeitsplatz in Luxemburg vorgestellt. Die Befunde der jährlichen Befragung durch den Quality of Work Index zeigen auf, dass ... [more ▼]

Im Rahmen dieser Newsletter werden die aktuellen Prävalenzraten zu Mobbing am Arbeitsplatz in Luxemburg vorgestellt. Die Befunde der jährlichen Befragung durch den Quality of Work Index zeigen auf, dass die Arbeitsplatzmobbingprävalenz zwischen 2014 und 2018 zwischen 12.4% und 18.1% variiert. Sinnlose Aufgaben und permanente Kritik an der eigenen Arbeit sind die häufigsten Mobbing-Verhaltensweisen, denen Arbeitnehmer ausgesetzt sind. Insbesondere Arbeitnehmer in Dienstleistungsberufen sind hierbei von Mobbing betroffen. Insgesamt beurteilen von Mobbing betroffene Arbeitnehmer ihre Arbeitsbedingungen durchschnittlich schlechter (z.B. weniger Autonomie, mehr Zeitdruck) als Arbeitnehmer, die kein Mobbing erleben. Zudem weisen Arbeitnehmer, die von Mobbing betroffen sind, ein geringeres Wohlbefinden auf. [less ▲]

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See detailFuturistic Project Becoming a Reality: Self-Driving Cars in Luxembourg
Vukovich, Lilla UL; Vysotskaya, Volha UL

E-print/Working paper (2019)

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See detailThe provision of long-term credit and firm growth
Leon, Florian UL

E-print/Working paper (2019)

This paper investigates whether a higher level of long-term credit provision affects the growth of small and young firms. Firm-level data from more than 20,000 firms in 62 countries are combined with a ... [more ▼]

This paper investigates whether a higher level of long-term credit provision affects the growth of small and young firms. Firm-level data from more than 20,000 firms in 62 countries are combined with a new hand-collected database on short-term and long-term credit provided to the private sector. Using a difference-in-difference framework, our results indicate that, contrary to short-term credit, long-term credit does not stimulate growth of small and young firms. This finding is, at least partially, explained by the differential impact of short-term and long-term credit provision on small and young firms’ access to credit. While the provision of short-term credit alleviates credit constraints faced by small and young firms, a larger provision of longterm bank loans has an opposite impact. Our findings are in line with the hypothesis that an increase of long-term credit provision reflects a lender’s choice to provide more financing to existing clients (intensive margin) to the detriment of firms without previous access to finance (extensive margin). [less ▲]

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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

E-print/Working paper (2019)

Detailed reference viewed: 86 (3 UL)
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See detailOptimal TNFS-secure pairings on elliptic curves with composite embedding degree
Fotiadis, Georgios UL; Martindale, Chloe

E-print/Working paper (2019)

Detailed reference viewed: 67 (3 UL)
See detailMitochondrial morphology provides a mechanism for energy buffering at synapses
Garcia, Guadalupe Clara UL; Bartol, Thomas M.; Phan, Sebastien A. et al

E-print/Working paper (2019)

Mitochondria as the main energy suppliers of eukaryotic cells are highly dynamic organelles that fuse, divide and are transported along the cytoskeleton to ensure cellular energy homeostasis. While these ... [more ▼]

Mitochondria as the main energy suppliers of eukaryotic cells are highly dynamic organelles that fuse, divide and are transported along the cytoskeleton to ensure cellular energy homeostasis. While these processes are well established, substantial evidence indicates that the internal structure is also highly variable in dependence on metabolic conditions. However, a quantitative mechanistic understanding of how mitochondrial morphology affects energetic states is still elusive. To address this question, we here present an agent-based dynamic model using three-dimensional morphologies from electron microscopy tomography which considers the molecular dynamics of the main ATP production components. We apply our modeling approach to mitochondria at the synapse which is the largest energy consumer within the brain. Interestingly, comparing the spatiotemporal simulations with a corresponding space-independent approach, we find minor space dependence when the system relaxes toward equilibrium but a qualitative difference in fluctuating environments. These results suggest that internal mitochondrial morphology is not only optimized for ATP production but also provides a mechanism for energy buffering and may represent a mechanism for cellular robustness. [less ▲]

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See detailIdentification of pathogenic variant enriched regions across genes and gene families
Pérez-Palma, Eduardo; May, Patrick UL; Iqbal, Sumaiya et al

E-print/Working paper (2019)

Missense variant interpretation is challenging. Essential regions for protein function are conserved among gene family members, and genetic variants within these regions are potentially more likely to ... [more ▼]

Missense variant interpretation is challenging. Essential regions for protein function are conserved among gene family members, and genetic variants within these regions are potentially more likely to confer risk to disease. Here, we generated 2,871 gene family protein sequence alignments involving 9,990 genes and performed missense variant burden analyses to identify novel essential protein regions. We mapped 2,219,811 variants from the general population into these alignments and compared their distribution with 65,034 missense variants from patients. With this gene family approach, we identified 398 regions enriched for patient variants spanning 33,887 amino acids in 1,058 genes. As a comparison, testing the same genes individually we identified less patient variant enriched regions involving only 2,167 amino acids and 180 genes. Next, we selected de novo variants from 6,753 patients with neurodevelopmental disorders and 1,911 unaffected siblings, and observed a 5.56-fold enrichment of patient variants in our identified regions (95% C.I. =2.76-Inf, p-value = 6.66×10−8). Using an independent ClinVar variant set, we found missense variants inside the identified regions are 111-fold more likely to be classified as pathogenic in comparison to benign classification (OR = 111.48, 95% C.I = 68.09-195.58, p-value < 2.2e−16). All patient variant enriched regions identified (PERs) are available online through a user-friendly platform for interactive data mining, visualization and download at http://per.broadinstitute.org. In summary, our gene family burden analysis approach identified novel patient variant enriched regions in protein sequences. This annotation can empower variant interpretation. [less ▲]

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See detailLes Lorrains actifs à l'étranger, analyse au niveau communal
Pigeron-Piroth, Isabelle UL; Helfer, Malte UL

E-print/Working paper (2019)

A growing number of people living in Lorraine cross the border for work. Today, there are more than 100 000 commuters, the majority of them working in Luxembourg. The flow of commuters into Luxembourg is ... [more ▼]

A growing number of people living in Lorraine cross the border for work. Today, there are more than 100 000 commuters, the majority of them working in Luxembourg. The flow of commuters into Luxembourg is on the increase, whereas commuting into Germany continues to shrink. The analysis of com-munes of residence shows a high proportion of cross-border commuters living as the active population in close vicinity to Luxembourg, but many also live in communes further afield; this phenomenon is moving beyond the borders and raises many issues: environmental, social and economic … [less ▲]

Detailed reference viewed: 67 (5 UL)
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See detailA Symbol of History
Danescu, Elena UL

E-print/Working paper (2019)

As the fifth sovereign of the national dynasty since 1890, Grand Duke Jean was a head of state who perfectly embodied the ideals of service to his country and commitment to European integration.

Detailed reference viewed: 26 (1 UL)
See detailMonetary Policy Transmission to Consumer Financial Stress and Durable Consumption
Georgarakos, Dimitris; Tatsiramos, Konstantinos UL

E-print/Working paper (2019)

We examine the effects of monetary policy on household self-assessed financial stress and durable consumption using panel data from eighteen annual waves of the British Household Panel Survey. For ... [more ▼]

We examine the effects of monetary policy on household self-assessed financial stress and durable consumption using panel data from eighteen annual waves of the British Household Panel Survey. For identification, we exploit random variation in household exposure to interest rates generated by the random timing of household interview dates with respect to policy rate changes. After accounting for household and month-year-of- interview fixed effects, we uncover significant heterogeneities in the way monetary policy affects household groups that differ in housing and saving status. In particular, an increase in the interest rate induces financial stress among mortgagors and renters, while it lessens financial stress of savers. We find symmetric effects on durable consumption, mainly driven by mortgagors with high debt burden or limited access to liquidity and younger renters who are prospective home buyers. [less ▲]

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See detailInexact Block Coordinate Descent Algorithms for Nonsmooth Nonconvex Optimization
Yang, Yang UL; Pesavento, Marius; Luo, Zhi-Quan et al

E-print/Working paper (2019)

In this paper, we propose an inexact block coordinate descent algorithm for large-scale nonsmooth nonconvex optimization problems. At each iteration, a particular block variable is selected and updated by ... [more ▼]

In this paper, we propose an inexact block coordinate descent algorithm for large-scale nonsmooth nonconvex optimization problems. At each iteration, a particular block variable is selected and updated by solving the original optimization problem with respect to that block variable inexactly. More precisely, a local approximation of the original optimization problem is solved. The proposed algorithm has several attractive features, namely, i) high flexibility, as the approximation function only needs to be strictly convex and it does not have to be a global upper bound of the original function; ii) fast convergence, as the approximation function can be designed to exploit the problem structure at hand and the stepsize is calculated by the line search; iii) low complexity, as the approximation subproblems are much easier to solve and the line search scheme is carried out over a properly constructed differentiable function; iv) guaranteed convergence to a stationary point, even when the objective function does not have a Lipschitz continuous gradient. Interestingly, when the approximation subproblem is solved by a descent algorithm, convergence to a stationary point is still guaranteed even if the approximation subproblem is solved inexactly by terminating the descent algorithm after a finite number of iterations. These features make the proposed algorithm suitable for large-scale problems where the dimension exceeds the memory and/or the processing capability of the existing hardware. These features are also illustrated by several applications in signal processing and machine learning, for instance, network anomaly detection and phase retrieval. [less ▲]

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See detailDéchiffrer le phénomène des travailleurs transfrontaliers en Suisse
Duchêne-Lacroix, Cédric; Wille, Christian UL; Pigeron-Piroth, Isabelle UL

E-print/Working paper (2019)

Cross-border workers form a little-known but numerous population in Switzerland. Beyond clichés, this contribution brings together the main characteristics of this population based on official statistics ... [more ▼]

Cross-border workers form a little-known but numerous population in Switzerland. Beyond clichés, this contribution brings together the main characteristics of this population based on official statistics and the latest research. The introduction of the Freedom of Movement Agreement did not change the growth trend of the population that remains to live and work in proximity of the border, mostly in France and near-Switzerland agglomerations. Conversely, the occupational areas and levels have diversified. Generally, cross-border workers have no negative influence on the labour market, except on salary level in some economic sectors in Ticino. The initiation of the “priority to Swiss residents” will not change the situation, which relates above all to the economic evolution. [less ▲]

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See detailLES IMPACTS ECONOMIQUES ET TERRITORIAUX DU TRAVAIL FRON-TALIER SUR LES TERRITOIRES DE RESIDENCE : L’exemple du bassin de Longwy
Belkacem, Rachid; Pigeron-Piroth, Isabelle UL

E-print/Working paper (2019)

This article questions the impacts of cross-border worker mobility on the economic and social devel-opment of their place of residence. We hypothesize that cross-border mobility produces resources for the ... [more ▼]

This article questions the impacts of cross-border worker mobility on the economic and social devel-opment of their place of residence. We hypothesize that cross-border mobility produces resources for the worker, the enterprise and the territory, but it can also be a source of constraints. After a geo-graphical framework of the study, this article analyses the main positive territorial impacts of cross-border mobility. It shows that they contribute to the territorial dynamism of these border regions by attracting new sociological profiles of workers, by revitalizing rural territories (through housing), by limiting the increase of local unemployment and by encouraging a new form of in-place economy. Fi-nally, the paper also shows how such mobility can impede the own development of these border terri-tories, such as via a deeper local social stratification and a lack of highly qualified manpower. [less ▲]

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See detailLes Lorrains actifs à l'étranger : une analyse cartographique au niveau communal
Helfer, Malte UL; Pigeron-Piroth, Isabelle UL

E-print/Working paper (2019)

A growing number of people living in Lorraine cross the border for work. Today, there are more than 100 000 commuters, the majority of them working in Luxembourg. The flow of commuters into Luxem-bourg is ... [more ▼]

A growing number of people living in Lorraine cross the border for work. Today, there are more than 100 000 commuters, the majority of them working in Luxembourg. The flow of commuters into Luxem-bourg is on the increase, whereas commuting into Germany continues to shrink. The analysis of com-munes of residence shows a high proportion of cross-border commuters living as the active population in close vicinity to Luxembourg, but many also live in communes further afield; this phenomenon is moving beyond the borders and raises many issues: environmental, social and economic … [less ▲]

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See detailles travailleurs frontaliers au Luxembourg et en Suisse : Emploi, Quotidien et Perceptions
Pigeron-Piroth, Isabelle UL; Wille, Christian UL

E-print/Working paper (2019)

Petits pays ayant d’importants besoins de main-d’œuvre, le Luxembourg et la Suisse attirent tous deux un grand nombre de travailleurs frontaliers. C’est dans une perspective comparative que les 19 auteurs ... [more ▼]

Petits pays ayant d’importants besoins de main-d’œuvre, le Luxembourg et la Suisse attirent tous deux un grand nombre de travailleurs frontaliers. C’est dans une perspective comparative que les 19 auteurs impliqués dans ce Cahier Thématique analysent la situation des travailleurs frontaliers dans les principaux pôles d’emploi transfrontaliers (Luxembourg, Bâle, Genève), mais également au Tessin. En tenant compte des éléments contextuels et méthodologiques, géographes, économistes, sociologues et politologues se focalisent sur les questions d’emploi, le quotidien transfrontalier et les perceptions des frontaliers par la société. Cette approche collective et pluridisciplinaire est résumée par les éditeurs en identifiant des enjeux communs pour le Luxembourg et la Suisse. [less ▲]

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See detailLe travail frontalier au Luxembourg : éléments de contexte et de portrait statistique
Pigeron-Piroth, Isabelle UL

E-print/Working paper (2019)

In Luxemburg, 44.4% of employees lives across the border and comes from the three neighboring coun-tries. Cross-border work has historic roots. It is a lasting, growing phenomenon, anchored in local econo ... [more ▼]

In Luxemburg, 44.4% of employees lives across the border and comes from the three neighboring coun-tries. Cross-border work has historic roots. It is a lasting, growing phenomenon, anchored in local econo-mies. This contribution underlines the importance of contextual conditions under which these flows have in-creased. It presents the main characteristics and challenges of cross-border work in Luxembourg, in order to compare with Switzerland. [less ▲]

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See detail5. Forschungsbericht zur Weiterentwicklung des Arbeitsqualitätsindexes in Luxemburg
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2019)

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde (Steffgen, Kohl, 2013; Sischka, Steffgen, 2015, 2016 ... [more ▼]

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde (Steffgen, Kohl, 2013; Sischka, Steffgen, 2015, 2016, 2017, 2019), wurde 2018 zum sechsten Mal durchgeführt. Ziel des Surveys ist es, die erlebte Arbeitssituation und -qualität luxemburgischer Arbeitnehmer zu erfassen. Der vorliegende Bericht dokumentiert die psychometrische Testung der Güte des aktuellen Erhebungsinstruments. In einem ersten Schritt erfolgt eine Beschreibung der Befragungsumstände sowie eine demographische Beschreibung der Stichprobe. Da die Erhebung 2018 als Mixed-Mode-Design – telefonische als auch Online-Befragung – durchgeführt wurde, wird auch analysiert, ob Stichprobenunterschiede zwischen den beiden Erhebungsmodi auftreten. Außerdem wird geklärt, ob es hinsichtlich demographischer Eigenschaften der Befragten, hinsichtlich der QoW-Skalen oder hinsichtlich verschiedener Well-Being-Maße zu systematischen Ausfällen seit der letzten Welle gekommen ist. Dann werden die Items der QoW- und Well-Being-Skalen auf fehlende Werte untersucht und es erfolgt eine Beschreibung der Items mittels verteilungsbeschreibender Maßzahlen und Balkendiagramme. In einem nächsten Schritt werden die Skalen mittels verschiedener Reliabilitätsstatistiken (Cronbach’s Alpha, Korrelationsanalysen der Items) sowie Koeffizienten zur Beschreibung der Skalenverteilung überprüft. Außerdem werden die Zusammenhänge der Skalen mittels Korrelationsanalysen überprüft. Im Anschluss daran wird die unterstellte Faktorenstruktur mittels konfirmatorischer Faktoren-analysen getestet. Die QoW-Skalen werden außerdem auf verschiedene Well-Being-Skalen regressiert, um deren Relevanz für den QoW-Index zu prüfen. Ebenso werden einige Längsschnitt-Regressionsanalysen durchgeführt, um zu überprüfen ob einige Arbeitsbedingungen längerfristige Effekte auf das Well-Being der Arbeitnehmer aufweisen. Die QoW-Befragung 2018 hat außerdem das Schwerpunktthema „Work-Life-Balance“ behandelt. Die Güte der Skalen zu diesem Thema wird ebenfalls geprüft. Im Anschluss werden dann Korrelationen mit den QoW- und Well-Being-Skalen berechnet. Abschließend wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Emp-fehlungen bezüglich zukünftiger Befragungen gegeben. [less ▲]

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See detailBORDERS IN THE LIVES OF ASYLUM SEEKERS & REFUGEES IN LUXEMBOURG & METZ
Paraschivescu, Claudia UL

E-print/Working paper (2019)

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See detailTo be or not to be: How the Luxembourgish government is preparing for Brexit
Vysotskaya, Volha UL; Vukovich, Lilla UL; Bissinger, Jutta UL et al

E-print/Working paper (2019)

This article summarizes the potential impact of BREXIT on Luxembourg (as seen by April 2019).

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See detailWeshalb wechseln Arbeitnehmer ihren Arbeitgeber?
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2019)

4,4% der Befragten des Quality of Work Survey hat zwischen den Erhebungen 2017 und 2018 den Arbeitgeber gewechselt. Vor allem die jüngsten Arbeitnehmer (16 bis 24 Jahre) sowie Arbeitnehmer mit einer ... [more ▼]

4,4% der Befragten des Quality of Work Survey hat zwischen den Erhebungen 2017 und 2018 den Arbeitgeber gewechselt. Vor allem die jüngsten Arbeitnehmer (16 bis 24 Jahre) sowie Arbeitnehmer mit einer befristeten Arbeitsstelle wechselten eher ihren Arbeitgeber. Je geringer Partizipation und Feedback, je höher Mobbing, und je geringer Einkommenszufriedenheit, Ausbildungs- und Beförderungsmöglichkeiten ausfallen, desto höher die Wahrscheinlichkeit eines Arbeitgeberwechsels. Arbeitnehmer, die den Arbeitgeber gewechselt haben, weisen dann im Mittel einen Zuwachs an Wohlbefinden auf. [less ▲]

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See detailGrothendieck-Teichmueller group, operads and graph complexes: a survey
Merkulov, Sergei UL

E-print/Working paper (2019)

This paper attempts to provide a more or less self-contained introduction into theory of the Grothendieck-Teichmueller group and Drinfeld associators using the theory of operads and graph complexes.

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See detailHyperideal polyhedra in the 3-dimensional anti-de Sitter space
Chen, Qiyu UL; Schlenker, Jean-Marc UL

E-print/Working paper (2019)

We study hyperideal polyhedra in the 3-dimensional anti-de Sitter space AdS3, which are defined as the intersection of the projective model of AdS3 with a convex polyhedron in RP3 whose vertices are all ... [more ▼]

We study hyperideal polyhedra in the 3-dimensional anti-de Sitter space AdS3, which are defined as the intersection of the projective model of AdS3 with a convex polyhedron in RP3 whose vertices are all outside of AdS3 and whose edges all meet AdS3. We show that hyperideal polyhedra in AdS3 are uniquely determined by their combinatorics and dihedral angles, as well as by the induced metric on their boundary together with an additional combinatorial data, and describe the possible dihedral angles and the possible induced metrics on the boundary. [less ▲]

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See detailRank n swapping algebra for Grassmannian
Sun, Zhe UL

E-print/Working paper (2019)

The rank n swapping algebra is the Poisson algebra defined on the ordered pairs of points on a circle using the linking numbers, where a subspace of (K^n×K^{n∗})^r/GL(n,K) is its geometric mode. In this ... [more ▼]

The rank n swapping algebra is the Poisson algebra defined on the ordered pairs of points on a circle using the linking numbers, where a subspace of (K^n×K^{n∗})^r/GL(n,K) is its geometric mode. In this paper, we find an injective Poisson homomorphism from the Poisson algebra on Grassmannian G(n,r) arising from boundary measurement map to the rank n swapping fraction algebra. [less ▲]

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See detailA Multi-agent approach for in silico simulations of micro-biological systems
Proverbio, Daniele UL; Gallo, Luca; Passalacqua, Barbara et al

E-print/Working paper (2019)

A Multi-agent approach forin silicosimulations ofmicro-biological systemsProverbio D., Gallo L., Passalacqua B., Pellegrino J., Maggiora M.AbstractUsing a Multi-agent systems paradigm, the present project ... [more ▼]

A Multi-agent approach forin silicosimulations ofmicro-biological systemsProverbio D., Gallo L., Passalacqua B., Pellegrino J., Maggiora M.AbstractUsing a Multi-agent systems paradigm, the present project develops, validates and exploits a computa-tionaltestbedthat simulates micro-biological complex systems, namely the aggregation patterns of thesocial amoebaDyctiostelium discoideum. We propose a new design and implementation for managingdiscrete simulations with autonomous agents on a microscopic scale, thus focusing on their social be-havior and mutual interactions. Then, the dependence on the main physical variables is tested, namelydensity and number of amoebas; in addition, we analyze the robustness of the dynamics against var-ious noise sources. Along with these results, we suggest a methodology for further studies that makeuse of our validated model. [less ▲]

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See detailBig images of two-dimensional pseudo representations
Conti, Andrea UL; Lang, Jaclyn; Medvedovsky, Anna

E-print/Working paper (2019)

For an odd prime p, we study the image of a continuous 2-dimensional (pseudo)representation rho of a profi nite group with coe cients in a local pro-p domain A. Under mild conditions, Bella che has proved ... [more ▼]

For an odd prime p, we study the image of a continuous 2-dimensional (pseudo)representation rho of a profi nite group with coe cients in a local pro-p domain A. Under mild conditions, Bella che has proved that the image of rho contains a nontrivial congruence subgroup of SL2(B) for a certain subring B of A. We prove that the ring B can be slightly enlarged and then described in terms of the conjugate self-twists of rho, symmetries that naturally constrain its image; hence this new B is optimal. We use this result to recover, and in some cases improve, the known large-image results for Galois representations arising from elliptic and Hilbert modular forms due to Serre, Ribet and Momose, and Nekov a r, and p-adic Hida or Coleman families of elliptic modular forms due to Hida, Lang, and Conti-Iovita-Tilouine. [less ▲]

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See detailRepatriation Efforts – Luxembourg State Policy Towards Jews during World War II
Bronec, Jakub UL

E-print/Working paper (2019)

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See detailSingle-cell transcriptomics reveals multiple neuronal cell types in human midbrain-specific organoids
Smits, Lisa UL; Magni, Stefano UL; Grzyb, Kamil UL et al

E-print/Working paper (2019)

Human stem cell-derived organoids have great potential for modelling physiological and pathological processes. They recapitulate in vitro the organisation and function of a respective organ or part of an ... [more ▼]

Human stem cell-derived organoids have great potential for modelling physiological and pathological processes. They recapitulate in vitro the organisation and function of a respective organ or part of an organ. Human midbrain organoids (hMOs) have been described to contain midbrain-specific dopaminergic neurons that release the neurotransmitter dopamine. However, the human midbrain contains also additional neuronal cell types, which are functionally interacting with each other. Here, we analysed hMOs at high-resolution by means of single-cell RNA-sequencing (scRNA-seq), imaging and electrophysiology to unravel cell heterogeneity. Our findings demonstrate that hMOs show essential neuronal functional properties as spontaneous electrophysiological activity of different neuronal subtypes, including dopaminergic, GABAergic, and glutamatergic neurons. Recapitulating these in vivo features makes hMOs an excellent tool for in vitro disease phenotyping and drug discovery. [less ▲]

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See detailScalable Viewing. Digitale Methoden und die Digital Humanities
Pause, Johannes UL; Walkowski, Niels-Oliver UL

E-print/Working paper (2019)

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See detailEnergy policies for eco-friendly households in Luxembourg—a study based on the LuxHEI model
Poncin, Stéphane Louis Maxim UL

E-print/Working paper (2019)

In the Grand Duchy of Luxembourg, the residential building sector is a major energy consumer and greenhouse gases emitter that is considered key in achieving the country's climate goals. The purpose of ... [more ▼]

In the Grand Duchy of Luxembourg, the residential building sector is a major energy consumer and greenhouse gases emitter that is considered key in achieving the country's climate goals. The purpose of this paper is to assess the effectiveness of the most important policy instruments in achieving savings in the final energy consumption and direct CO2 emissions of Luxembourgish households. Our study is based on the LuxHEI model, which is an enhanced and upgraded version of the well-known French simulation model Res-IRF. This variant has been adjusted to the particular problems of a small country with growing economy and a quickly increasing population. The LuxHEI model goes beyond standard energy-economy models by incorporating global warming as a decision-making factor. The model outcomes reveal that total environmental and economic effectiveness increases if energy policy tools are applied concurrently. In 2060, and compared to the no-policy baseline scenario, the most aspirational policy mix enables energy savings of 42% and an emission mitigation of 60%. From our results we can draw the following policy implications: for a significant improvement of the sector's energy efficiency and sufficiency, (1) the implementation of a remediation duty for existing buildings and (2) the tightening of the performance standards for new constructions, (3) combined with a national carbon tax, are crucial. [less ▲]

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See detail4. Forschungsbericht zur Weiterentwicklung des Arbeitsqualitätsindexes in Luxemburg
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2019)

Der Survey zu dem „Quality of Work Index Luxembourg“ (QoW), der von der Universität Luxemburg und der luxemburgischen Chambré des Salariés entwickelt wurde (Steffgen, Kohl, 2013; Sischka, Steffgen, 2015 ... [more ▼]

Der Survey zu dem „Quality of Work Index Luxembourg“ (QoW), der von der Universität Luxemburg und der luxemburgischen Chambré des Salariés entwickelt wurde (Steffgen, Kohl, 2013; Sischka, Steffgen, 2015, 2016, 2017), wurde 2017 bereits zum fünften Mal mittels einer telefonischen Befragung durchgeführt. Ziel des Index ist es, die erlebte Arbeitssituation und -qualität luxemburgischer Arbeitnehmer zu erfassen. Der vorliegende Bericht dokumentiert die psychometrische Testung der Güte des aktuellen Erhebungsinstruments. Dazu erfolgt zunächst eine Beschreibung der für die Skalen genutzten Items, die Überprüfung der internen Konsistenz der jeweiligen Skala mittels verschiedener Reliabilitätsstatistiken (Cronbach’s Alpha, Korrelationsanalysen der Items) sowie Koeffizienten zur Beschreibung der Skalenverteilung. Konfirmatorische Faktorenanalysen dienen dazu, zu testen, ob die Items auf den a priori festgelegten Faktoren laden und ob sich die unterstellte Faktorenstruktur auch in den Daten zeigt. Außerdem werden die Zusammenhänge der Skalen mittels Korrelationsanalysen über-prüft. Die QoW-Skalen werden außerdem auf verschiedene Well-Being-Skalen regressiert, um deren Relevanz für den QoW-Index zu prüfen. Da der QoW Survey teilweise als Panelbefragung durchgeführt wird, wird außerdem geklärt, ob es hinsichtlich demographischer Eigenschaften der Befragten, hinsichtlich der QoW-Skalen oder hinsichtlich verschiedener Well-Being-Maße zu systematischen Ausfällen seit der letzten Welle gekommen ist. Ebenso werden einige Längsschnitt-Regressionsanalysen gerechnet, um zu überprüfen, ob einige Arbeitsbedingungen längerfristige Effekte auf das Well-Being der Arbeitnehmer aufweisen. Die QoW-Befragung 2017 hat außerdem das Schwerpunktthema „Digitalisierung“ behandelt. Die Themenblöcke werden mittels Latenter Profile-Analysen untersucht. Im Anschluss wird überprüft ob sich die extrahierten Profile hinsichtlich der QoW- und der Well-Being-Skalen unterscheiden. Abschließend wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Empfehlungen bezüglich der weiteren Entwicklung der Skalen gegeben. [less ▲]

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See detailAutomobile, sport et tourisme. Le Grand Prix de la Marne dans le calendrier européen (1925-1939)
Moreau, Sebastien UL

E-print/Working paper (2019)

Depuis le début du xxe siècle, notamment à l’occasion des coupes Gordon-Bennett (1900), c’est sous les projecteurs d’une presse cocardière, complice et friande de modernité technique que les constructeurs ... [more ▼]

Depuis le début du xxe siècle, notamment à l’occasion des coupes Gordon-Bennett (1900), c’est sous les projecteurs d’une presse cocardière, complice et friande de modernité technique que les constructeurs automobiles présentent, sur la scène européenne, les performances de leurs bolides. Au lendemain de la Première Guerre mondiale, alors que le parc automobile et les flux touristiques croissent de façon vertigineuse, les courses automobiles se multiplient. Un championnat d’Europe est organisé en 1925 par la Commission sportive internationale de l’Association internationale des automobile-clubs reconnus (AIACR) qui s’appuie sur des initiatives locales. Pour les organisateurs locaux de courses, inscrire son circuit dans le calendrier du championnat d’Europe devient un enjeu majeur. Soutenus par les commerçants, industriels et édiles politiques locaux, les organisateurs saisissent l’occasion de la course pour faire de la publicité et stimuler l’économie. Partout en Europe, des acteurs locaux se mobilisent en ce sens pour tirer profit et prestige des circulations plurielles qu’engendre le sport automobile européen. Le cas du Grand Prix de la Marne illustre parfaitement l’enchevêtrement des échelles qui caractérise, du local à l’international, l’émergence d’une scène et d’un public européens pour les spectacles sportifs automobiles [less ▲]

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See detailFear and Euphoria
Lehnert, Thorsten UL

E-print/Working paper (2019)

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See detailCorporate Governance and Skewness in Stock Returns
Berglund, Tom; Lehnert, Thorsten UL; Rolle, Gudrun

E-print/Working paper (2019)

This paper analyzes the relationship between corporate governance and idiosyncratic skewness of stock returns. We test this hypothesis by analyzing the impact of external as well as internal governance ... [more ▼]

This paper analyzes the relationship between corporate governance and idiosyncratic skewness of stock returns. We test this hypothesis by analyzing the impact of external as well as internal governance provisions, and are thus able to provide an overall understanding of the relationship between governance and firm-specific return asymmetries. Our results show that better governance leads to a reduction in idiosyncratic skewness in relatively non-competitive industries. In relatively competitive industries, governance has less to no impact on firm-specific return skewness. Furthermore, an overall increase in transparency, quality and disclosure of information, proxied through the Sarbanes Oxley Act, reduces relative idiosyncratic skewness. Our findings can be regarded as detrimental for shareholders, who have a preference for positive idiosyncratic skewness. The evidence contributes to a debate, which suggests that – at the end of the day – an act like Sarbanes-Oxley, which was intended to protect shareholders from accounting errors and frauds and to improve the accuracy of corporate disclosures, comes at the expenses of shareholders. The reduction of idiosyncratic skewness through better governance collides with shareholder’s preference for idiosyncratic and positively skewed stock returns, which present a lottery like upside option of monetary gains and value creation through the right tail. This side effect of governance is also in line with the literature that highlights potential costs of corporate governance. [less ▲]

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See detailThe induced metric on the boundary of the convex hull of a quasicircle in hyperbolic and anti de Sitter geometry
Bonsante, Francesco; Danciger, Jeff; Maloni, Sara et al

E-print/Working paper (2019)

Celebrated work of Alexandrov and Pogorelov determines exactly which metrics on the sphere are induced on the boundary of a compact convex subset of hyperbolic three-space. As a step toward a ... [more ▼]

Celebrated work of Alexandrov and Pogorelov determines exactly which metrics on the sphere are induced on the boundary of a compact convex subset of hyperbolic three-space. As a step toward a generalization for unbounded convex subsets, we consider convex regions of hyperbolic three-space bounded by two properly embedded disks which meet at infinity along a Jordan curve in the ideal boundary. In this setting, it is natural to augment the notion of induced metric on the boundary of the convex set to include a gluing map at infinity which records how the asymptotic geometry of the two surfaces compares near points of the limiting Jordan curve. Restricting further to the case in which the induced metrics on the two bounding surfaces have constant curvature K∈[−1,0) and the Jordan curve at infinity is a quasicircle, the gluing map is naturally a quasisymmetric homeomorphism of the circle. The main result is that for each value of K, every quasisymmetric map is achieved as the gluing map at infinity along some quasicircle. We also prove analogous results in the setting of three-dimensional anti de Sitter geometry. Our results may be viewed as universal versions of the conjectures of Thurston and Mess about prescribing the induced metric on the boundary of the convex core of quasifuchsian hyperbolic manifolds and globally hyperbolic anti de Sitter spacetimes. [less ▲]

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See detailCOP 24 and Climate Finance: A Stepping Stone or a Blurred Line?
Alexandraki, Chrysa UL

E-print/Working paper (2019)

In December 2018, the 24th Conference of the Parties (COP 24) to the United Nations Framework Convention on Climate Change (UNFCCC), took place in Katowice, Poland. The main objective of those ... [more ▼]

In December 2018, the 24th Conference of the Parties (COP 24) to the United Nations Framework Convention on Climate Change (UNFCCC), took place in Katowice, Poland. The main objective of those negotiations was to finalize the so called ‘Paris Rulebook’ [the Paris Agreement Work Programme (PAWP)], which would constitute a set of rules to implement and operationalize the Paris Agreement. The issues at stakes varied from mitigation, adaptation and loss and damage, to more technical issues, such as transparency, climate finance and carbon market mechanisms under the Paris Agreement. This post focuses on the progress made on the issue of climate finance based on an analysis of the COP 24 decision on the relevant issues. [less ▲]

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See detailA System and Method for Monitoring Controlling and Troubleshooting of Abrasive Waterjet Cutting Apparatus
Copertaro, Edoardo UL

E-print/Working paper (2019)

The invention consists of a system and method for monitoring, controlling and troubleshooting of Abrasive Waterjet Cutting machinery. More in detail, the method exploits a network of sensors for ... [more ▼]

The invention consists of a system and method for monitoring, controlling and troubleshooting of Abrasive Waterjet Cutting machinery. More in detail, the method exploits a network of sensors for continuously monitor its vibroacoustic emission pattern. Relevant features are extracted from the data using an iterative processing method. Deviations from a benchmark are interpreted based on model training then used for automatic control and troubleshooting. The expected outcome is an improvement of waterjet automation and robustness to the excellence of Industry 4.0 with a consequent impact on both its cost effectiveness and the provided quality assurance. [less ▲]

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See detailConformal actions of higher-rank lattices on pseudo-Riemannian manifolds
Pecastaing, Vincent UL

E-print/Working paper (2019)

We investigate conformal actions of cocompact lattices in higher-rank simple Lie groups on compact pseudo-Riemannian manifolds. Our main result gives a general bound on the real-rank of the lattice, which ... [more ▼]

We investigate conformal actions of cocompact lattices in higher-rank simple Lie groups on compact pseudo-Riemannian manifolds. Our main result gives a general bound on the real-rank of the lattice, which was already known for the action of the full Lie group ([33]). When the real-rank is maximal, we prove that the manifold is conformally flat. This indicates that a global conclusion similar to that of [1] and [17] in the case of a Lie group action might be obtained. We also give better estimates for actions of cocompact lattices in exceptional groups. Our work is strongly inspired by the recent breakthrough of Brown, Fisher and Hurtado on Zimmer’s conjecture [7]. [less ▲]

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See detailFollow the Money, If You Can - Possible Solutions for Enhanced FIU Cooperation Under Improved Data Protection Rules
Quintel, Teresa Alegra UL

E-print/Working paper (2019)

Financial information can play a key role in tackling Money Laundering (ML), Terrorist Financing (TF) and combatting serious crime more generally. Preventing and fighting ML and the financing of terrorism ... [more ▼]

Financial information can play a key role in tackling Money Laundering (ML), Terrorist Financing (TF) and combatting serious crime more generally. Preventing and fighting ML and the financing of terrorism were top priorities of the European Agenda on Security, which might explain the fast developments regarding the regulation of Anti-Money Laundering (AML) and Counter Terrorism Financing (CTF). During the past years, the European Commission (Commission) proposed several legal texts to reform the current AML framework and to facilitate timely law enforcement (LE) access to financial data for the prevention, detection, investigation and prosecution of serious crime. The line between administrative sanctions and criminal law measures seems to become increasingly blurred, as the latest proposals are no longer based on an internal market provision, but on police and judicial cooperation legal bases. Financial Intelligence Units (FIUs) play a crucial role in analysing and exchanging information concerning suspicious transactions, serving as intermediaries between the private sector and Law Enforcement Authorities (LEAs). Because of the international nature of financial crime, cooperation between FIUs is of paramount importance. Yet, due to different organizational settings in the EU Member States, FIUs are not always able to exchange data effectively, which leads to information gaps. One of the reasons why the data exchange between FIUs is impeded are data protection rules that apply differently depending on the organizational structure of the FIUs in the 28 Member States. Whereas some FIUs must adhere to the stricter data protection rules under the General Data Protection Regulation (GDPR), others may exchange data more flexibly within the scope of the data protection Directive for police and criminal justice authorities (LED). Therefore, the counter-argument to granting broader LE-access rights to financial data by LEAs could be to enable a more effective exchange of data between FIUs. This article argues that FIUs should be able to process personal data within the scope of the LED, in order to have more flexibility to receive, analyse and exchange data: On the one hand, the LED provides sufficiently high data protection standards and adequate safeguards for data subjects while allowing FIUs to carry out their tasks effectively under harmonized rules. On the other hand, this would be an argument to strengthening the role of FIUs as neutral intermediaries instead of granting additional access to personal data by LEAs. [less ▲]

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See detailCluster Analysis for Investment funds portfolio optimisation: A symbolic data approach
Terraza, Virginie UL; Toque, Carole

E-print/Working paper (2019)

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See detailThe Crowdsourced Replication Initiative: Investigating Immigration and Social Policy Preferences. Executive Report.
Breznau, Nate; Rinke, Eike Mark; Wuttke, Alexander et al

E-print/Working paper (2019)

In an era of mass migration, social scientists, populist parties and social movements raise concerns over the future of immigration-destination societies. What impacts does this have on policy and social ... [more ▼]

In an era of mass migration, social scientists, populist parties and social movements raise concerns over the future of immigration-destination societies. What impacts does this have on policy and social solidarity? Comparative cross-national research, relying mostly on secondary data, has findings in different directions. There is a threat of selective model reporting and lack of replicability. The heterogeneity of countries obscures attempts to clearly define data-generating models. P-hacking and HARKing lurk among standard research practices in this area.This project employs crowdsourcing to address these issues. It draws on replication, deliberation, meta-analysis and harnessing the power of many minds at once. The Crowdsourced Replication Initiative carries two main goals, (a) to better investigate the linkage between immigration and social policy preferences across countries, and (b) to develop crowdsourcing as a social science method. The Executive Report provides short reviews of the area of social policy preferences and immigration, and the methods and impetus behind crowdsourcing plus a description of the entire project. Three main areas of findings will appear in three papers, that are registered as PAPs or in process. [less ▲]

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See detailAutomation, Economic Growth, and the Labor Share - A Comment on Prettner (2019)
Irmen, Andreas UL; Heer, Burkhard

E-print/Working paper (2019)

Prettner (2019) studies the implications of automation for economic growth and the labor share in a variant of the Solow-Swan model. The aggregate production function allows for two types of capital ... [more ▼]

Prettner (2019) studies the implications of automation for economic growth and the labor share in a variant of the Solow-Swan model. The aggregate production function allows for two types of capital, traditional and automation capital. Traditional capital and labor are imperfect substitutes whereas automation capital and labor are perfect substitutes. In this paper, we point to a flaw in Prettner’s analysis that invalidates his main analytical and computational findings. In contrast to Prettner, we argue that both kinds of capital are perfect substitutes as stores of value, and, therefore, must earn the same rate of return in equilibrium. Our computational analysis shows that the model dramatically overestimates the actual decline in the US labor share over the last 50 years. [less ▲]

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See detailAlzette: A 64-bit ARX-box
Beierle, Christof UL; Biryukov, Alex UL; Cardoso Dos Santos, Luan UL et al

E-print/Working paper (2019)

S-boxes are the only source of non-linearity in many symmetric primitives. While they are often defined as being functions operating on a small space, some recent designs propose the use of much larger ... [more ▼]

S-boxes are the only source of non-linearity in many symmetric primitives. While they are often defined as being functions operating on a small space, some recent designs propose the use of much larger ones (e.g., 32 bits). In this context, an S-box is then defined as a subfunction whose cryptographic properties can be estimated precisely. In this paper, we present a 64-bit ARX-based S-box called Alzette, which can be evaluated in constant time using only 12 instructions on modern CPUs. Its parallel application can also leverage vector (SIMD) instructions. One iteration of Alzette has differential and linear properties comparable to those of the AES S-box, while two iterations are at least as secure as the AES super S-box. Since the state size is much larger than the typical 4 or 8 bits, the study of the relevant cryptographic properties of Alzette is not trivial. [less ▲]

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See detailGalois families of modular forms and application to weight one
Arias-de-Reyna, Sara; Legrand, François; Wiese, Gabor UL

E-print/Working paper (2019)

We introduce Galois families of modular forms. They are a new kind of family coming from Galois representations of the absolute Galois groups of rational function fields over the rational field. We ... [more ▼]

We introduce Galois families of modular forms. They are a new kind of family coming from Galois representations of the absolute Galois groups of rational function fields over the rational field. We exhibit some examples and provide an infinite Galois family of non-liftable weight one Katz modular eigenforms over an algebraic closure of F_p for p in {3,5,7,11}. [less ▲]

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See detailDistributional change: Assessing the contribution of household income sources
Kyzyma, Iryna; Fusco; van Kerm, Philippe UL

E-print/Working paper (2019)

We develop a decomposition of distributional change by factor components to quantify how changes in the association between sources of income and changes in their marginal distributions contribute to the ... [more ▼]

We develop a decomposition of distributional change by factor components to quantify how changes in the association between sources of income and changes in their marginal distributions contribute to the change in the distribution of household incomes over time. The two components are further broken down to isolate the contribution of specific income sources. Application to the change in the distribution of household incomes in Luxembourg between 2004 and 2013 reveals contrasted results: increased association between spouse earnings, public transfers, and taxes depressed the income share of poor households while changes in marginal distributions increased incomes in the upper half of the distribution. [less ▲]

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See detailLes auteurs programmés en milieu scolaire
Raus, Tonia UL

E-print/Working paper (2019)

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See detailErster Forschungsbericht zur Weiterentwicklung der „Enquête concernant la qualité de vie et la motivation au travail“.
Sischka, Philipp UL; Fernandez de Henestrosa, Martha UL; Steffgen, Georges UL

E-print/Working paper (2019)

Das Ministère de la Fonction publique et de la Réforme administrative hat 2017 eine Befragung mit dem Titel “Enquête concernant la qualité de vie et la motivation au travail” unter den Mitarbeitern des ... [more ▼]

Das Ministère de la Fonction publique et de la Réforme administrative hat 2017 eine Befragung mit dem Titel “Enquête concernant la qualité de vie et la motivation au travail” unter den Mitarbeitern des öffentlichen Dienstes durchgeführt. Die Universität Luxembourg wurde damit betraut, die psychometrische Qualität des Fragebogens zu prüfen, die Zusammenhänge zwischen den Gruppenvariablen zu untersuchen, die gruppenbezogene Vergleiche vorzulegen, die Befunde mit mit denen anderer Studien zu vergleichen sowie Handlungshinweise zur Optimierung der Arbeitsqualitàt vorzulegen (siehe Convention de recherche entre l‘Université du Luxembourg et le Minsitère de la Fonction Publique et de la Réforme administrative du 24. mai 2018). Entsprechend der Vorgaben der Konvention werden in dem vorliegenden ersten Bericht, die Befunde a) zu der psychometrischen Testung der Güte des aktuellen Erhebungsinstruments (Punkt 2.1.1 der Konvention), b) zu den gruppenbezogenen Vergleiche (Punkt 2.1.3, Satz 1 der Konvention) sowie c) zu den Zusammenängen zwischen den Gruppenvariablen (Punkt 2.1.2 der Konvention) vorgelegt. In einem ersten Schritt erfolgt zunächst eine Beschreibung der Items mittels verteilungsbe-schreibender Maßzahlen und Balkendiagramme, wobei die Items auch auf fehlende Werte un-tersucht werden. Ergebnisse der inhaltlichen und psychometrischen Itemprüfung zeigen, dass der Fragebogen z.T. noch wichtige Entwicklungsfelder aufweist. In einem zweiten Schritt werden exploratorische Faktorenanalysen durchgeführt, um einen Überblick über die Faktorstruktur des Fragebogens zu erhalten. Die Faktoranalysen erfolgen bezogen auf die einzelnen Themenblöcke (Zufriedenheit, Motivation, Wohlbefinden, Arbeits-bedingungen). Auf Basis der identifizierten Faktorstruktur wurden geeignete Items aus den vier Bereichen zu 17 Skalen zusammengefasst. In einem dritten Schritt erfolgt eine Analyse der internen Konsistenz der neu gebildeten Skalen. Zudem werden die Inter-Korrelationen dieser Skalen vorgelegt. Befunde zeigen, dass die meisten Skalen akzeptable bis exzellente Reliabilitätskoeffizienten aufweisen. Allerdings lassen sich erhöhte Inter-Korrelationen zwischen einigen Skalen identifizieren, die auf eine vorliegende Redundanz der Skalen deuten. In einem vierten Schritt werden gruppenbezogene Vergleiche hinsichtlich Geschlecht, Alters-gruppen, Beschäftigungssituation, Jahre im öffentlichen Dienst, Gehaltsgruppen, Anzahl Zusammenfassung II zugeordneter Mitarbeiter sowie Länge des Arbeitswegs zu den neu gebildeten Skalen durchgeführt und die Befunde präsentiert. Beispielsweise zeigen Mitarbeiter mit den wenigsten Jahren im öffentlichen Dienst tendenziell günstigere Werte hinsichtlich der vier Themenblöcke auf. In einem fünften Schritt werden Regressionsanalysen durchgeführt, um Zusammenhänge zwischen den Gruppenvariablen, Arbeitsbedingungen und den einzelnen Themenblöcken zu veranschaulichen. Die Befunde verdeutlichen, dass Zufriedenheit, Motivation und Wohl-befinden mit verschiedenen Arbeitsbedingungen assoziiert sind. In einem abschließenden Schritt wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Empfehlungen bezüglich der weiteren Entwicklung des Fragebogens und der Skalen gegeben. [less ▲]

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See detailSocial division in the market: conspicous consumption with nationalist feelings
Zanaj, Skerdilajda UL

E-print/Working paper (2019)

In this paper, we explore the effects of conspicuous goods as a means of social division between native citizens and migrants. We push forward the hypothesis that choosing a particular good can confer a ... [more ▼]

In this paper, we explore the effects of conspicuous goods as a means of social division between native citizens and migrants. We push forward the hypothesis that choosing a particular good can confer a sense of place. We introduce this idea in an international vertical differentiation market with two variants and two social groups: migrants and natives. Natives are narrow-minded since they attribute a positive social value to the variant that complies with their own consumption culture. Migrants are open-minded. When consumers belonging to different groups meet, they exchange information about their consumption habits and consumption well-being that reveals their consumption culture: narrow-minded versus open-minded. Consequently, after meeting, some consumers may change beliefs (narrow-minded to open-minded or vice versa) and consumption choices. Using a dynamic model, we fully elucidate the steady-state equilibrium and highlight the impact of nationalism on migrant integration. [less ▲]

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See detailCryptanalysis of the Legendre PRF and generalizations
Beullens, Ward; Beyne, Tim; Udovenko, Aleksei UL et al

E-print/Working paper (2019)

The Legendre PRF relies on the conjectured pseudorandomness properties of the Legendre symbol with a hidden shift. Originally proposed as a PRG by Damgård at CRYPTO 1988, it was recently suggested as an ... [more ▼]

The Legendre PRF relies on the conjectured pseudorandomness properties of the Legendre symbol with a hidden shift. Originally proposed as a PRG by Damgård at CRYPTO 1988, it was recently suggested as an efficient PRF for multiparty computation purposes by Grassi et al. at CCS 2016. Moreover, the Legendre PRF is being considered for usage in the Ethereum 2.0 blockchain. This paper improves previous attacks on the Legendre PRF and its higher-degree variant due to Khovratovich by reducing the time complexity from O(plogp/M) to O(plog^2p/M2) Legendre symbol evaluations when M≤p√4 queries are available. The practical relevance of our improved attack is demonstrated by breaking two concrete instances of the PRF proposed by the Ethereum foundation. Furthermore, we generalize our attack in a nontrivial way to the higher-degree variant of the Legendre PRF and we point out a large class of weak keys for this construction. Lastly, we provide the first security analysis of two additional generalizations of the Legendre PRF originally proposed by Damgård in the PRG setting, namely the Jacobi PRF and the power residue PRF. [less ▲]

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See detailUnramifiedness of weight one Hilbert Hecke algebras
Deo, Shaunak; Dimitrov, Mladen; Wiese, Gabor UL

E-print/Working paper (2019)

We prove that the Galois pseudo-representation valued in the mod p^n parallel weight 1 Hecke algebra for GL(2) over a totally real number field F is unramified at a place above p if p-1 does not divide ... [more ▼]

We prove that the Galois pseudo-representation valued in the mod p^n parallel weight 1 Hecke algebra for GL(2) over a totally real number field F is unramified at a place above p if p-1 does not divide the ramification index at that place. A novel geometric ingredient is the construction and study, in the case when p ramifies in F, of generalised Theta-operators using Reduzzi-Xiao's generalised Hasse invariants, including especially an injectivity criterion in terms of minimal weights. [less ▲]

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See detailA Commentary on the Right to an Effective Remedy in the Case Law of the CJEU
Hofmann, Herwig UL

E-print/Working paper (2019)

The right to an effective judicial remedy is an essential element of realising the rule of law. It is the fundamental right granting individuals the possibility to request independent review of compliance ... [more ▼]

The right to an effective judicial remedy is an essential element of realising the rule of law. It is the fundamental right granting individuals the possibility to request independent review of compliance with the legal provisions. The genius of protecting as an individual fundamental right this structural notion of independent judicial review, has much contributed to the prominence and the protection of judicial accountability and effective enforcement of EU law. Yet, this critical commentary on the right to an effective remedy shows that the case law of the CJEU has predominantly aimed at ensuring Member State compliance with the right to an effective remedy. When it comes to reviewing EU law provisions against this right, the general considerations of ensuring effective judicial remedies are a lot less pressing, and accordingly, the CJEU has decided to be less stringent in its application of the right. Such case law of the CJEU has left gaps in protection. The commentary ends with the observations that additional problems for the enforcement of the right to an effective remedy arise from the often-composite nature of procedures, linking one or several Member State bodies with European institutions and bodies in one single procedure. [less ▲]

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See detailIndividual Attitudes towards Immigration in Aging Populations
Irmen, Andreas UL; Cömertpay, Rana UL; Litina, Anastasia UL

E-print/Working paper (2019)

This research empirically establishes the hypothesis that the process of population aging in a society as a whole affects the attitudes of its members towards immigration. Hence, an aging social ... [more ▼]

This research empirically establishes the hypothesis that the process of population aging in a society as a whole affects the attitudes of its members towards immigration. Hence, an aging social environment exerts an effect on the attitudes of individuals towards immigration after accounting for their age and other individual characteristics. We test this hypothesis in a multilevel analysis of individuals living in 25 European OECD countries over the period 2002-2017. Our measure of “societal population aging” is the old-age dependency ratio. “Attitudes” are taken from immigration related questions in eight consecutive rounds of the European Social Survey. For these attitudes we find non-linear, U-shaped relationships. Hence, the effect of societal population aging on individual attitudes towards immigration is negative in young societies and positive in old ones. [less ▲]

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See detailGreen Urban Areas
Picard, Pierre M UL; Tran, Thi Thu Huyen UL

E-print/Working paper (2019)

This paper studies the size and location of urban green areas across city spaces. Urban green areas offer amenities that affect residential choices, land consumption and land rent. This paper discusses ... [more ▼]

This paper studies the size and location of urban green areas across city spaces. Urban green areas offer amenities that affect residential choices, land consumption and land rent. This paper discusses the socially optimal sizes and locations of urban green areas within a city and their decentralized allocation through land markets. The main result is that the share of land dedicated to urban green areas is a concave function of the distance to the city center. This result is confirmed by the empirical study of urban structures in the 305 largest EU cities. The importance of urban green areas is finally assessed by a counterfactual analysis, where 50% of urban green areas are removed in each city. [less ▲]

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See detailThéorie d'Iwasawa des motifs d'Artin et des formes modulaires de poids 1
Maksoud, Alexandre UL

E-print/Working paper (2019)

Let p be an odd prime. We study the structure of the cyclotomic Greenberg-Selmer group attached to a general irreducible Artin motive over Q endowed with an ordinary p-stabilization. Under the Leopoldt ... [more ▼]

Let p be an odd prime. We study the structure of the cyclotomic Greenberg-Selmer group attached to a general irreducible Artin motive over Q endowed with an ordinary p-stabilization. Under the Leopoldt and the weak p-adic Schanuel Conjectures, we show that it is of torsion over the Iwasawa algebra. Under mild hypotheses on p we compute the constant term of its characteristic series in terms of a p-adic regulator and we highlight an extra zeros phenomenon. We then focus on Artin motives attached to classical weight one modular forms, to which our preceding results apply unconditionally. We formulate an Iwasawa Main Conjecture in this context and prove one divisibility using a Theorem of Kato. [less ▲]

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See detailMultivariate stable approximation in Wasserstein distance by Stein's method
Chen, Peng; Nourdin, Ivan UL; Xu, Lihu et al

E-print/Working paper (2019)

Detailed reference viewed: 30 (0 UL)
Peer Reviewed
See detailThe Breuer-Major Theorem in total variation: improved rates under minimal regularity
Nourdin, Ivan UL; Nualart, David; Peccati, Giovanni UL

E-print/Working paper (2019)

Detailed reference viewed: 26 (1 UL)
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See detailPredicting Functional Effects of Missense Variants in Voltage-Gated Sodium and Calcium Channels
Heyne, Henrike O.; Baez-Nieto, David; Iqbal, Sumaiya et al

E-print/Working paper (2019)

Malfunctions of voltage-gated sodium and calcium channels (SCN and CACNA1 genes) have been associated with severe neurologic, psychiatric, cardiac and other diseases. Altered channel activity is ... [more ▼]

Malfunctions of voltage-gated sodium and calcium channels (SCN and CACNA1 genes) have been associated with severe neurologic, psychiatric, cardiac and other diseases. Altered channel activity is frequently grouped into gain or loss of ion channel function (GOF or LOF, respectively) which is not only corresponding to clinical disease manifestations, but also to differences in drug response. Experimental studies of channel function are therefore important, but laborious and usually focus only on a few variants at a time. Based on known gene-disease-mechanisms, we here infer LOF (518 variants) and GOF (309 variants) of likely pathogenic variants from disease phenotypes of variant carriers. We show regional clustering of inferred GOF and LOF variants, respectively, across the alignment of the entire gene family, suggesting shared pathomechanisms in the SCN/CACNA1 genes. By training a machine learning model on sequence- and structure-based features we predict LOF- or GOF- associated disease phenotypes (ROC = 0.85) of likely pathogenic missense variants. We then successfully validate the GOF versus LOF prediction on 87 functionally tested variants in SCN1/2/8A and CACNA1I (ROC = 0.73) and in exome-wide data from > 100.000 cases and controls. Ultimately, functional prediction of missense variants in clinically relevant genes will facilitate precision medicine in clinical practice. [less ▲]

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See detailTrade and Vertical Differentiation
Picard, Pierre M UL; Tampieri, Alessandro

E-print/Working paper (2019)

This paper discusses a trade model with many countries, many goods produced in multiple quality versions, and non-homothetic preferences. It embeds in the same model a series of results that have been ... [more ▼]

This paper discusses a trade model with many countries, many goods produced in multiple quality versions, and non-homothetic preferences. It embeds in the same model a series of results that have been empirically confirmed: high-income countries specialize in the production of high-quality goods and trade more of those. Richer countries purchase more high-quality varieties. They import more high-quality products from the most productive exporters. The paper then studies the impact of productivity and population changes on the quality composition of exports. It finally explains why countries import higher quality goods from more distant countries. [less ▲]

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See detailNon-integrable stable approximation by Stein's method
Chen, Peng; Nourdin, Ivan UL; Xu, Lihu et al

E-print/Working paper (2019)

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See detailConcise UC Zero-Knowledge Proofs for Oblivious Updatable Databases
Camenisch, Jan; Dubovitskaya, Maria; Rial, Alfredo UL

E-print/Working paper (2019)

We propose an ideal functionality $\Functionality_{\COMD}$ and a construction for oblivious and updatable committed databases. $\Functionality_{\COMD}$ allows a prover to read, write, and update values in ... [more ▼]

We propose an ideal functionality $\Functionality_{\COMD}$ and a construction for oblivious and updatable committed databases. $\Functionality_{\COMD}$ allows a prover to read, write, and update values in a database and to prove to a verifier in zero-knowledge that a value is read from or written into a certain position. The following properties must hold: (1) values stored in the database remain hidden from the verifier; (2) a value read from a certain position is equal to the value previously written into that position; (3) (obliviousness) both the value read or written and its position remain hidden from the verifier. We describe a construction for $\Functionality_{\COMD}$ based on vector commitments. After the initialization phase, the cost of zero-knowedge proofs for reading and writing is independent of the database size, outperforming other techniques that achieve cost sublinear in the dataset size for prover and/or verifier. Therefore, our construction is especially appealing for cases with large datasets. Finally, we show how to use $\Functionality_{\COMD}$ as a building block in ``commit-and-prove'' two-party protocols, i.e.\ protocols where the prover commits to her inputs and subsequently proves in zero-knowledge statements about the committed values. In comparison to simply using commitment schemes, our construction allows the prover to hide positions read or written efficiently, which is useful to design protocols for e.g.\ cloud-based services, blockchain, privacy-preserving location sharing services and e-commerce, and efficient OR proofs. [less ▲]

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See detailANCHOR: logically-centralized security for Software-Defined Networks
Kreutz, Diego UL; Yu, Jiangshan UL; Ramos, Fernando M. V. et al

E-print/Working paper (2019)

Software-de ned networking (SDN) decouples the control and data planes of traditional networks, logically centralizing the functional properties of the network in the SDN controller. While this ... [more ▼]

Software-de ned networking (SDN) decouples the control and data planes of traditional networks, logically centralizing the functional properties of the network in the SDN controller. While this centralization brought advantages such as a faster pace of innovation, it also disrupted some of the natural defenses of traditional architectures against di erent threats. The literature on SDN has mostly been concerned with the functional side, despite some speci c works concerning non-functional properties like ‘security’ or ‘dependability’. Though addressing the latter in an ad-hoc, piecemeal way, may work, it will most likely lead to e ciency and e ectiveness problems. We claim that the enforcement of non-functional properties as a pillar of SDN robustness calls for a systemic approach. We further advocate, for its materialization, the re-iteration of the successful formula behind SDN – ‘logical centralization’. As a general concept, we propose anchor, a subsystem architecture that promotes the logical centralization of non-functional properties. To show the e ectiveness of the concept, we focus on ‘security’ in this paper: we identify the current security gaps in SDNs and we populate the architecture middleware with the appropriate security mechanisms, in a global and consistent manner. anchor sets to provide essential security mechanisms such as strong entropy, resilient pseudo-random generators, secure device registration and association, among other crucial services. We claim and justify in the paper that centralizing such mechanisms is key for their e ectiveness, by allowing us to: de ne and enforce global policies for those properties; reduce the complexity of controllers and forwarding devices; ensure higher levels of robustness for critical services; foster interoperability of the non-functional property enforcement mechanisms; and nally, better foster the resilience of the architecture itself. We discuss design and implementation aspects, and we prove and evaluate our algorithms and mechanisms. [less ▲]

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See detailKummer theory for number fields and the reductions of algebraic numbers
Perucca, Antonella UL; Sgobba, Pietro UL

E-print/Working paper (2019)

For all number fields the failure of maximality for the Kummer extensions is bounded in a very strong sense. We give a direct proof (without relying on the Bashmakov-Ribet method) of the fact that if G is ... [more ▼]

For all number fields the failure of maximality for the Kummer extensions is bounded in a very strong sense. We give a direct proof (without relying on the Bashmakov-Ribet method) of the fact that if G is a finitely generated and torsion-free multiplicative subgroup of a number field K having rank r, then the ratio between n^r and the Kummer degree [K(\zeta_n,\sqrt[n]{G}):K(\zeta_n)] is bounded independently of n. We then apply this result to generalise to higher rank a theorem of Ziegler from 2006 about the multiplicative order of the reductions of algebraic integers (the multiplicative order must be in a given arithmetic progression, and an additional Frobenius condition may be considered). [less ▲]

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See detailAddendum to: Reductions of algebraic integers
Perucca, Antonella UL; Sgobba, Pietro UL; Tronto, Sebastiano UL

E-print/Working paper (2019)

Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. We consider Kummer extensions of G of the form K(\zeta_{2^m}, \sqrt[2^n]G)/K(\zeta_{2^m}), where n \leq m. In ... [more ▼]

Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. We consider Kummer extensions of G of the form K(\zeta_{2^m}, \sqrt[2^n]G)/K(\zeta_{2^m}), where n \leq m. In the paper "Reductions of algebraic integers" (J. Number Theory, 2016) by Debry and Perucca, the degrees of those extensions have been evaluated in terms of divisibility parameters over K(\zeta_4). We prove how properties of G over K explicitly determine the divisibility parameters over K(\zeta_4). This result has a clear computational advantage, since no field extension is required. [less ▲]

Detailed reference viewed: 120 (22 UL)
See detailMinimizing immersions of a hyperbolic surface in a hyperbolic 3-manifold
Bonsante, Francesco; Mondello, Gabriele; Schlenker, Jean-Marc UL

E-print/Working paper (2019)

Let (S,h) be a closed hyperbolic surface and M be a quasi-Fuchsian 3-manifold. We consider incompressible maps from S to M that are critical points of an energy functional F which is homogeneous of degree ... [more ▼]

Let (S,h) be a closed hyperbolic surface and M be a quasi-Fuchsian 3-manifold. We consider incompressible maps from S to M that are critical points of an energy functional F which is homogeneous of degree 1. These ``minimizing'' maps are solutions of a non-linear elliptic equation, and reminiscent of harmonic maps -- but when the target is Fuchsian, minimizing maps are minimal Lagrangian diffeomorphisms to the totally geodesic surface in M. We prove the uniqueness of smooth minimizing maps from (S,h) to M in a given homotopy class. When (S,h) is fixed, smooth minimizing maps from (S,h) are described by a simple holomorphic data on S: a complex self-adjoint Codazzi tensor of determinant 1. The space of admissible data is smooth and naturally equipped with a complex structure, for which the monodromy map taking a data to the holonomy representation of the image is holomorphic. Minimizing maps are in this way reminiscent of shear-bend coordinates, with the complexification of F analoguous to the complex length. [less ▲]

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See detailDynamical strategies for obstacle avoidance during Dictyostelium discoideum aggregation: a Multi-agent system model
Proverbio, Daniele UL; Maggiora, Marco

E-print/Working paper (2019)

Chemotaxis, the movement of an organism in response to a chemical stimulus, is a typical feature of many microbiological systems. In particular, the social amoeba Disctyostelium discoideum is widely used ... [more ▼]

Chemotaxis, the movement of an organism in response to a chemical stimulus, is a typical feature of many microbiological systems. In particular, the social amoeba Disctyostelium discoideum is widely used as a model organism, but it is not still clear how it behaves in heterogeneous environments. A few models focused on mechanical features have already addressed the question; however, we propose that phenomenological models focusing on the dynamics may provide new meaningful data. Consequently, by means of a specific Multi-agent system model, we studied the dynamical features emerging from complex social interactions among individuals belonging to amoeboids colonies. After defining an appropriate metric to perform meaningful measurements, we found that: a) obstacles play the role of local topological perturbation, as they alter the flux of chemical signals; b) that obstacle that physically block the cellular motion as well as the chemicals elicit dynamical evolutions that are not statistically distinguishable from the case where obstacles that do not interfere physically with said motion; c) that fluctuations of the dynamics can lead to better exploration of the physical space, thus preventing multiple stable aggregates. From previous results, we may speculate about the fact that chemotactic cells, in many cases, can avoid obstacles by simply following the altered chemical gradient: social interactions seem to be sufficient to guarantee the aggregation of the whole colony past numerous obstacles. It is then unlikely that cells have developed special mechanisms to cope with the presence of topological perturbation sources. Nevertheless, we suggest that further studies can provide better understanding and that, in order to gain deeper knowledge, mechanical models should be coupled with phenomenological, system-oriented ones. [less ▲]

Detailed reference viewed: 59 (4 UL)
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See detailA hyper-reduction method using adaptivity to cut the assembly costs of reduced order models
Hale, Jack UL; Schenone, Elisa; Baroli, Davide UL et al

E-print/Working paper (2019)

At every iteration or timestep of the online phase of some reduced-order modelling schemes, large linear systems must be assembled and then projected onto a reduced order basis of small dimension. The ... [more ▼]

At every iteration or timestep of the online phase of some reduced-order modelling schemes, large linear systems must be assembled and then projected onto a reduced order basis of small dimension. The projected small linear systems are cheap to solve, but assembly and projection are now the dominant computational cost. In this paper we introduce a new hyper-reduction strategy called reduced assembly (RA) that drastically cuts these costs. RA consists of a triangulation adaptation algorithm that uses a local error indicator to con- struct a reduced assembly triangulation specially suited to the reduced order basis. Crucially, this reduced assembly triangulation has fewer cells than the original one, resulting in lower assembly and projection costs. We demonstrate the efficacy of RA on a Galerkin-POD type reduced order model (RAPOD). We show performance increases of up to five times over the baseline Galerkin-POD method on a non-linear reaction-diffusion problem solved with a semi-implicit time-stepping scheme and up to seven times for a 3D hyperelasticity problem solved with a continuation Newton-Raphson algorithm. The examples are implemented in the DOLFIN finite element solver using PETSc and SLEPc for linear algebra. Full code and data files to produce the results in this paper are provided as supplementary material. [less ▲]

Detailed reference viewed: 223 (30 UL)
See detailPractical bounds on the error of Bayesian posterior approximations: A nonasymptotic approach
Huggins, Jonathan; Kasprzak, Mikolaj UL; Campbell, Trevor et al

E-print/Working paper (2019)

Detailed reference viewed: 43 (4 UL)
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See detailExtensional Higher-Order Paramodulation in Leo-III
Steen, Alexander UL; Benzmüller, Christoph UL

E-print/Working paper (2019)

Detailed reference viewed: 27 (1 UL)
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See detailApproXON: Heuristic Approximation to the E-Field-Threshold for Deep Brain Stimulation Volume-of-Tissue-Activated Estimation
Proverbio, Daniele UL; Husch, Andreas UL

E-print/Working paper (2019)

This paper introduces a heuristic approximation of the e-field threshold used for volume-of-tissue activated computation in deep brain stimulation. Pulse width and axon diameter are used as predictors. An ... [more ▼]

This paper introduces a heuristic approximation of the e-field threshold used for volume-of-tissue activated computation in deep brain stimulation. Pulse width and axon diameter are used as predictors. An open source implementation in MATLAB is provided together with an integration in the open LeadDBS deep brain stimulation research toolbox. [less ▲]

Detailed reference viewed: 53 (8 UL)
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See detailDifferential graded Lie groups and their differential graded Lie algebras
Jubin, Benoît; Kotov, Alexei; Poncin, Norbert UL et al

E-print/Working paper (2019)

Detailed reference viewed: 55 (2 UL)
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See detailKrichever-Novivkov type algebras. A general review and the genus zero case
Schlichenmaier, Martin UL

E-print/Working paper (2019)

In the first part of this survey we recall the definition and some of the constructions related to Krichever--Novikov type algebras. Krichever and Novikov introduced them for higher genus Riemann surfaces ... [more ▼]

In the first part of this survey we recall the definition and some of the constructions related to Krichever--Novikov type algebras. Krichever and Novikov introduced them for higher genus Riemann surfaces with two marked points in generalization of the classical algebras of Conformal Field Theory. Schlichenmaier extended the theory to the multi-point situation and even to a larger class of algebras. The almost-gradedness of the algebras and the classification of almost-graded central extensions play an important role in the theory and in applications. In the second part we specialize the construction to the genus zero multi-point case. This yields beside instructive examples also additional results. In particular, we construct universal central extensions for the involved algebras, which are vector field algebras, differential operator algebras, current algebras and Lie superalgebras. We point out that the recently (re-)discussed $N$-Virasoro algebras are nothing else as multi-point genus zero Krichever-Novikov type algebras. The survey closes with structure equations and central extensions for the three-point case. [less ▲]

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See detailGrenzüberschreitende Zusammenarbeit als Praxisformation. Perspektiven für eine alternative Kooperationsforschung
Wille, Christian UL; Connor, Ulla UL

E-print/Working paper (2019)

The paper presents a practice-sociological approach to the description and analysis of cross-border cooperation. For this purpose, the development of cooperation research, its characteristic orientations ... [more ▼]

The paper presents a practice-sociological approach to the description and analysis of cross-border cooperation. For this purpose, the development of cooperation research, its characteristic orientations as well as the fundamentals of practical theoretical thinking will be outlined. Based on this, the heuristic figure of thought of cross-border practice formation is developed, which breaks with the premises of conventional cooperation research. It will be further differentiated on the basis of four challenges of cross-border cooperation, in order to arrive at an alternative perspective on cross-border cooperation. The following is an outlook, which deals with the research-specific features of the approach presented, with a view to a future practice-sociological and multidisciplinary cooperation research. [less ▲]

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See detailBianchi's additional symmetries
Rahm, Alexander UL

E-print/Working paper (2019)

Detailed reference viewed: 37 (1 UL)
See detailAccounting for the distributional effects of the 2007-2008 crisis and the Economic Adjustment Program in Portugal
Sologon, Denisa; Almeida, Vanda; van Kerm, Philippe UL

E-print/Working paper (2019)

This paper develops a new method to model the household disposable income distribution and decompose changes in this distribution (or functionals such as inequality measures) over time. It integrates both ... [more ▼]

This paper develops a new method to model the household disposable income distribution and decompose changes in this distribution (or functionals such as inequality measures) over time. It integrates both a micro-econometric and microsimulation approaches, combining a flexible parametric modelling of the distribution of market income with the EUROMOD microsimulation model to simulate the value of taxes and benefits. The method allows for the quantification of the contributions of four main factors to changes in the disposable income distribution between any two years: (i) labour market structure; (ii) returns; (iii) demographic composition; and (iv) tax-benefit system. We apply this new framework to the study of changes in the income distribution in Portugal between 2007 and 2013, accounting for the distributional effects of the 2007-2008 crisis and aftermath policies, in particular the Economic Adjustment Program (EAP). Results show that these effects were substantial and reflected markedly different developments over two periods: 2007-2009, when stimulus packages determined important income gains for the bottom of the distribution and a decrease in income inequality; 2010-2013, when the crisis and austerity measures took a toll on the incomes of Portuguese households, particularly those at the bottom and top of the distribution, leading to an increase in income inequality. [less ▲]

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See detailThe War of Rare Earth Elements: A Dynamic Game Approach
Bertinelli, Luisito UL; Poncin, Stéphane Louis Maxim UL; Zou, Benteng UL

E-print/Working paper (2019)

Rare earth elements govern today’s high-tech world and are deemed to be essential for the attainment of sustainable development goals. Since the 1990s, these elements have been predominantly supplied by ... [more ▼]

Rare earth elements govern today’s high-tech world and are deemed to be essential for the attainment of sustainable development goals. Since the 1990s, these elements have been predominantly supplied by one single actor, China. However, due to the increasing global relevance of their availability, other countries are now encouraged to enter the market. The objective of this paper is to analyze the strategic interactions among (potential) suppliers. In particular, we are interested in (1) the optimal timing for a newcomer (e.g. the U.S.) to enter the market, (2) the incumbent’s (i.e. China’s) optimal behavior, and (3) the cost-efficiency of cooperative vs. competitive market relations. By setting up a continuous-time dynamic game model, we show that (1) the newcomer should postpone the production launch until its rare earth reserves coincide with those of the incumbent, (2) the incumbent should strive for a late market entry and therefore keep its monopolistic resource extraction at the lowest possible level, (3) compared to the payoffs under competition, cooperation leads to a Pareto improvement when started at an early stage. The findings of our model are particularly relevant for the rational strategic positioning of the two great powers, America and China. [less ▲]

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See detailLes pratiques du quotidien transfrontalières dans la Grande Région SaarLorLux
Wille, Christian UL

E-print/Working paper (2019)

This paper analyses everyday practices carried out by the residents of the Saarland, Lorraine, Luxembourg, Rhineland-Palatinate and Wallonia in the neighbouring regions abroad. The key assumption is the ... [more ▼]

This paper analyses everyday practices carried out by the residents of the Saarland, Lorraine, Luxembourg, Rhineland-Palatinate and Wallonia in the neighbouring regions abroad. The key assumption is the consider-ation that the inhabitants of the Greater Region SaarLorLux define the transborder reality of life of this region through their cross-border performance of everyday practices. Such a socio-constructivist perspective is not interested in what the Greater Region SaarLorLux actually is, but in what ways it is constituted or how it manifests itself in the daily lives of its inhabitants. Therefor the most common cross-border everyday prac-tices, such as shopping for everyday needs, leisure-time shopping, outdoor recreation / tourism, cultural events, as well as visiting friends and family are looked at in greater detail. These observations are based on selected findings from three recent empirical studies of the study region, which have been linked to each other as well as socio-culturally and socioeconomically mapped in order to carve out the spatial organiza-tion, the motives and other contextual factors of cross-border everyday practices in the Greater Region SaarLorLux. This approach allows reconstructing mobility flows and spatial emphases in the context of everyday practices and gives insights into the nature of cross-border living realities in the Greater Region SaarLorLux. [less ▲]

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See detailUC Updatable Non-Hiding Committed Database with Efficient Zero-Knowledge Proofs
Rial, Alfredo UL

E-print/Working paper (2019)

We define an ideal functionality $\Functionality_{\DB}$ and a protocol $\mathrm{\Pi_{\DB}}$ for an updatable non-hiding committed database ($\DB$). $\DB$ is described as the task of storing a database ... [more ▼]

We define an ideal functionality $\Functionality_{\DB}$ and a protocol $\mathrm{\Pi_{\DB}}$ for an updatable non-hiding committed database ($\DB$). $\DB$ is described as the task of storing a database into a suitable data structure that allows you to efficiently prove in zero-knowledge (ZK) that a value is stored in the database at a certain position. The database is \emph{non-hiding} because both prover and verifier know its content. It is \emph{committed} in the sense that only ZK proofs about position-value pairs that are actually stored are possible. It is \emph{updatable} because its contents can be modified dynamically throughout the protocol execution. The $\DB$ task is used implicitly as building block of privacy-preserving protocols for e-commerce, smart billing and access control. In those protocols, this task is intertwined with others. Our functionality $\Functionality_{\DB}$ allows us to study constructions for this task in isolation. Furthermore, it allows us to improve modularity in protocol design, by using $\Functionality_{\DB}$ as building block of those protocols along with functionalities for other tasks. Our construction $\mathrm{\Pi_{\DB}}$ uses a non-hiding vector commitment (VC) scheme as building block. Thanks to the efficiency properties of non-hiding VC schemes, $\mathrm{\Pi_{\DB}}$ provides ZK proofs whose computation cost (after initialization) and whose size are both independent of the database size. Therefore, $\mathrm{\Pi_{\DB}}$ is suitable for large databases. Moreover, the database can be updated dynamically and very efficiently. [less ▲]

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See detailHousehold credit and growth: International evidence
Leon, Florian UL

E-print/Working paper (2019)

This paper has two main objectives. First, it attempts to distinguish the effects of household and enterprise credit on economic growth for a large sample of developing and developed countries. Second, it ... [more ▼]

This paper has two main objectives. First, it attempts to distinguish the effects of household and enterprise credit on economic growth for a large sample of developing and developed countries. Second, it investigates the channels through which household credit affects economic growth. To do so, a new database covering 143 countries over the period 1995-2014 is employed. Econometric results show that household credit has a negative effect on growth, while business credit has a positive, albeit non significant, impact on growth. The literature provide two possible explanations to justify the negative effect of household credit. On the one hand, household credit expansion can induce more financial fragility. On the other hand, the negative impact of household credit could be explained by its effect on saving behaviors. Results provide some evidence indicating that the negative effect of household credit is more driven by the latter than the former. [less ▲]

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See detailConsumption home bias and ethnocentrism: an international duopoly
Zanaj, Skerdilajda UL

E-print/Working paper (2019)

We define a model with two countries and two vertically differentiated goods, a high and a low-quality variant, and heterogenous consumers with respect to their willingness to pay for quality. Consumers ... [more ▼]

We define a model with two countries and two vertically differentiated goods, a high and a low-quality variant, and heterogenous consumers with respect to their willingness to pay for quality. Consumers in one country are ethnocentric in consumption. They thrive additional satisfaction when consuming a domestic good rather than a foreign one since only the former can satisfy their sense of place. We investigate the role of trade costs and ethnocentric attitude in shaping the equilibrium configuration of the international duopoly. [less ▲]

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See detailAn introduction to the theory of unconditionally secure message authentication using the constructive cryptography framework
Ostrev, Dimiter UL

E-print/Working paper (2019)

We provide an introduction to certain ideas from the theory of unconditionally secure message authentication. We explain the notions of impersonation and substitution attacks, and explain how protection ... [more ▼]

We provide an introduction to certain ideas from the theory of unconditionally secure message authentication. We explain the notions of impersonation and substitution attacks, and explain how protection against these two types of attack implies composable, information theoretic security. We explain the relation of authentication protocols to universal hashing. We give both probabilistic and explicit constructions proving the existence of one way authentication protocols using a short secret key and we prove matching lower bounds on the required secret key size. Then, we turn attention to interactive authentication protocols. We explain the message size reduction technique used by Gemmell and Naor and later Naor, Segev and Smith, and how it leads to protocols with secret key size independent of the message length. We also prove a matching lower bound on the secret key entropy. We generalize the lower bound proof of Naor, Segev and Smith and remove the assumption that the message is revealed in the first flow of the protocol. [less ▲]

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See detailEphemeral persistence modules and distance comparison
Berkouk, Nicolas; Petit, François UL

E-print/Working paper (2019)

We provide a definition of ephemeral multi-persistent modules and prove that the quotient of persistent modules by the ephemeral ones is equivalent to the category of γ-sheaves. In the case of one ... [more ▼]

We provide a definition of ephemeral multi-persistent modules and prove that the quotient of persistent modules by the ephemeral ones is equivalent to the category of γ-sheaves. In the case of one-dimensional persistence, our definition agrees with the usual one showing that the observable category and the category of γ-sheaves are equivalent. We also establish isometry theorems between the category of persistent modules and γ-sheaves both endowed with their interleaving distance. Finally, we compare the interleaving and convolution distances. [less ▲]

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See detailWorin liegen die Chancen und Risiken der verstärkten Nutzung von Informations- und Kommunikationstechnologien außerhalb des Arbeitsplatzes?
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Rund 11% der Arbeitnehmer in Luxemburg können der Gruppe zugeordnet werden, die häufig Informations- und Kommunikationstechnologien nutzt, um fern von ihrer organisationalen Arbeitsstelle zu arbeiten ... [more ▼]

Rund 11% der Arbeitnehmer in Luxemburg können der Gruppe zugeordnet werden, die häufig Informations- und Kommunikationstechnologien nutzt, um fern von ihrer organisationalen Arbeitsstelle zu arbeiten. Insbesondere bei männlichen und höher gebildeten Arbeitnehmern sowie bei Managern und Arbeitnehmern in akademischen Berufen ist dieser Anteil an Nutzern stärker ausgeprägt. Diese Arbeitsplatz fernen Nutzer von Informationstechnologien geben im Durchschnitt ein höheres Maß an Autonomie und Partizipation bei der Arbeit an, sind jedoch verstärkt von problematischen psychosozialen Arbeitsbedingungen (z.B. Mobbing, Work-Life-Konflikte) sowie Burnout betroffen. [less ▲]

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See detailBowditch's Q-conditions and Minsky's primitive stability
Lee, Jaejeong; Xu, Binbin UL

E-print/Working paper (2018)

For the action of the outer automorphism group of the rank two free group on the corresponding variety of PSL(2,C) characters, two domains of discontinuity have been known to exist that are strictly ... [more ▼]

For the action of the outer automorphism group of the rank two free group on the corresponding variety of PSL(2,C) characters, two domains of discontinuity have been known to exist that are strictly larger than the set of Schottky characters. One is introduced by Bowditch in 1998 (followed by Tan, Wong and Zhang in 2008) and the other by Minsky in 2013. We prove that these two domains are equal. We then show that they are contained in the set of characters having what we call the bounded intersection property. [less ▲]

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See detailOn Degree-d Zero-Sum Sets of Full Rank
Beierle, Christof UL; Biryukov, Alex UL; Udovenko, Aleksei UL

E-print/Working paper (2018)

A set S⊆Fn2 is called degree-d zero-sum if the sum ∑s∈Sf(s) vanishes for all n-bit Boolean functions of algebraic degree at most d. Those sets correspond to the supports of the n-bit Boolean functions of ... [more ▼]

A set S⊆Fn2 is called degree-d zero-sum if the sum ∑s∈Sf(s) vanishes for all n-bit Boolean functions of algebraic degree at most d. Those sets correspond to the supports of the n-bit Boolean functions of degree at most n−d−1. We prove some results on the existence of degree-d zero-sum sets of full rank, i.e., those that contain n linearly independent elements, and show relations to degree-1 annihilator spaces of Boolean functions and semi-orthogonal matrices. We are particularly interested in the smallest of such sets and prove bounds on the minimum number of elements in a degree-d zero-sum set of rank n. The motivation for studying those objects comes from the fact that degree-d zero-sum sets of full rank can be used to build linear mappings that preserve special kinds of nonlinear invariants, similar to those obtained from orthogonal matrices and exploited by Todo, Leander and Sasaki for breaking the block ciphers Midori, Scream and iScream. [less ▲]

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See detailDer Bachelor ind Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder
Dujardin, Céline UL; Böwen, Petra UL; Flammang, Manou Laure UL

E-print/Working paper (2018)

Der Newsletter ist eine Fortführung der Publikation "Der Bachelor in Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder". Er wird vervollständigt durch die Daten neuen berufsbegleitenden ... [more ▼]

Der Newsletter ist eine Fortführung der Publikation "Der Bachelor in Sozial- und Erziehungswissenschaften (BSSE) und seine Praxisfelder". Er wird vervollständigt durch die Daten neuen berufsbegleitenden BSSE. Der Newsletter bilanziert die Bewerber- sowie die Studienverlaufsdaten mit den Praxisfeldern und den Bachelorarbeiten des Jahres 2017-2018 [less ▲]

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See detailEmploi et développement économique au sein de la Grande Région : développement économique différencié et impacts de l’emploi transfrontalier
Belkacem, Rachid; Dörrenbächer, Peter; Pigeron-Piroth, Isabelle UL

E-print/Working paper (2018)

Axé sur le thème du développement économique et de l’emploi, ce rapport se consacrera plus spécifiquement au développement économique différencié (entre les diverses composantes de la Grande Région) et ... [more ▼]

Axé sur le thème du développement économique et de l’emploi, ce rapport se consacrera plus spécifiquement au développement économique différencié (entre les diverses composantes de la Grande Région) et aux impacts de l’emploi transfrontalier. Il se base sur l’expertise géographique et socioéconomique de ses auteurs, intéressés aux questions transfrontalières et plus particulièrement au phénomène de travail frontalier. [less ▲]

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See detailMigration patterns in Luxembourg
Stogianni, Maria UL

E-print/Working paper (2018)

Detailed reference viewed: 35 (0 UL)