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See detailThe mod 2 cohomology rings of congruence subgroups in the Bianchi groups
Berkove, Ethan; Lakeland, Grant; Rahm, Alexander UL

E-print/Working paper (in press)

We provide new tools for the calculation of the torsion in the cohomology of congruence subgroups in the Bianchi groups : An algorithm for finding particularly useful fundamental domains, and an analysis ... [more ▼]

We provide new tools for the calculation of the torsion in the cohomology of congruence subgroups in the Bianchi groups : An algorithm for finding particularly useful fundamental domains, and an analysis of the equivariant spectral sequence combined with torsion subcomplex reduction. [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)

Detailed reference viewed: 41 (4 UL)
See detailSingle-cell transcriptomics reveals multiple neuronal cell types in human midbrain-specific organoids
Smith, Lisa M.; 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 ▲]

Detailed reference viewed: 55 (5 UL)
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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 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 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 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 ▲]

Detailed reference viewed: 41 (2 UL)
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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 ▲]

Detailed reference viewed: 32 (2 UL)
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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 ▲]

Detailed reference viewed: 38 (0 UL)
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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 ▲]

Detailed reference viewed: 117 (17 UL)
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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 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 detailLinear system identification from ensemble snapshot observations
Aalto, Atte UL; Goncalves, Jorge UL

E-print/Working paper (2019)

Developments in transcriptomics techniques have caused a large demand in tailored computational methods for modelling gene expression dynamics from experimental data. Recently, so-called single-cell ... [more ▼]

Developments in transcriptomics techniques have caused a large demand in tailored computational methods for modelling gene expression dynamics from experimental data. Recently, so-called single-cell experiments have revolutionised genetic studies. These experiments yield gene expression data in single cell resolution for a large number of cells at a time. However, the cells are destroyed in the measurement process, and so the data consist of snapshots of an ensemble evolving over time, instead of time series. The problem studied in this article is how such data can be used in modelling gene regulatory dynamics. Two different paradigms are studied for linear system identification. The first is based on tracking the evolution of the distribution of cells over time. The second is based on the so-called pseudotime concept, identifying a common trajectory through the state space, along which cells propagate with different rates. Therefore, at any given time, the population contains cells in different stages of the trajectory. Resulting methods are compared in numerical experiments. [less ▲]

Detailed reference viewed: 33 (3 UL)
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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 ▲]

Detailed reference viewed: 23 (4 UL)
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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 detailTNFS Resistant Families of Pairing-Friendly Elliptic Curves
Fotiadis, Georgios UL; Konstantinou, Elisavet

E-print/Working paper (2018)

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See detailOptimal TNFS-secure pairings on elliptic curves with even embedding degree
Fotiadis, Georgios UL; Martindale, Chloe

E-print/Working paper (2018)

Detailed reference viewed: 14 (4 UL)
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See detailThe dual Bonahon-Schläfli formula
Mazzoli, Filippo UL

E-print/Working paper (2018)

Given a differentiable deformation of geometrically finite hyperbolic 3-manifolds (M_t)_t, the Bonahon-Schläfli formula expresses the derivative of the volume of the convex cores (CM_t)_t in terms of the ... [more ▼]

Given a differentiable deformation of geometrically finite hyperbolic 3-manifolds (M_t)_t, the Bonahon-Schläfli formula expresses the derivative of the volume of the convex cores (CM_t)_t in terms of the variation of the geometry of its boundary, as the classical Schläfli formula does for the volume of hyperbolic polyhedra. Here we study the analogous problem for the dual volume, a notion that arises from the polarity relation between the hyperbolic space H^3 and the de Sitter space dS^3. The corresponding dual Bonahon-Schläfli formula has been originally deduced from Bonahon's work by Krasnov and Schlenker. Here, making use of the differential Schläfli formula and the properties of the dual volume, we give a (almost) self-contained proof of the dual Bonahon-Schläfli formula, without making use of Bonahon's original result. [less ▲]

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See detailMicromechanical model for sintering and damage in viscoelastic porous ice and snow. Part I: Theory
Kabore, Brice Wendlassida UL; Peters, Bernhard UL

E-print/Working paper (2018)

Ice and snow have sometime been classified as a viscoelastic or viscoplastic mate- rial according to temperature, strain rate, pressure and time scale. Throughout experimental studies presented in the ... [more ▼]

Ice and snow have sometime been classified as a viscoelastic or viscoplastic mate- rial according to temperature, strain rate, pressure and time scale. Throughout experimental studies presented in the literature, it has been observed that at very low temperatures or high strain rate, porous ice and snow exhibit brittle behavior, but experience high viscous and plastic flow at temperatures closed to the melting point and low rates. At the macroscopic level nonlinearity is not necessarily attributed to material level permanent changes or yielding but mainly to micro cracks, porosity collapse and crack propagation. This paper attempts to address this complex behavior with a full microstructure based model. [less ▲]

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See detailPortability of Student Benefits in the European Union - The Luxembourg System
Silga, Janine UL

E-print/Working paper (2018)

Since its creation, Luxembourg’s system of financial aid for higher (university) studies has set as its primary objective the increase of the proportion of its resident population holding a higher ... [more ▼]

Since its creation, Luxembourg’s system of financial aid for higher (university) studies has set as its primary objective the increase of the proportion of its resident population holding a higher education degree. However, the fact that Luxembourg did not have its own university system until 2003 made this country even more dependent on other European countries to fulfil this policy objective. This explains why the portability of national financial assistance for higher education was crucial to achieve it. In the European Union (EU) context, the portability – or exportability – of student grants or loans may be defined as the faculty for students to ‘export’ such benefits to a Member State that is different from the one which allocates them. Portability is also the reason why the Luxembourg system falls into the scope of EU law, since it may interfere with equal treatment between workers all the more so, as frontier workers account for more than 45% of the country’s labour force. These peculiarities provide the background for the three decisions of the Court of Justice of the EU (CJEU) on the portability of financial aid for higher studies for children of frontier workers that lie at the heart of this paper. It will start by briefly highlighting the evolution of Luxembourg’s system of financial aid for higher education and present its main features. Then, it will show that despite the recent clarifications given by the CJEU in the last two cases of 2016, several issues remain unanswered, both from an EU and national law perspective. [less ▲]

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See detailA Proof of Entropy Minimization for Outputs in Deletion Channels via Hidden Word Statistics
Atashpendar, Arash UL; Mestel, David; Roscoe, A.W. (Bill) et al

E-print/Working paper (2018)

From the output produced by a memoryless deletion channel from a uniformly random input of known length n, one obtains a posterior distribution on the channel input. The difference between the Shannon ... [more ▼]

From the output produced by a memoryless deletion channel from a uniformly random input of known length n, one obtains a posterior distribution on the channel input. The difference between the Shannon entropy of this distribution and that of the uniform prior measures the amount of information about the channel input which is conveyed by the output of length m, and it is natural to ask for which outputs this is extremized. This question was posed in a previous work, where it was conjectured on the basis of experimental data that the entropy of the posterior is minimized and maximized by the constant strings 𝟶𝟶𝟶… and 𝟷𝟷𝟷… and the alternating strings 𝟶𝟷𝟶𝟷… and 𝟷𝟶𝟷𝟶… respectively. In the present work we confirm the minimization conjecture in the asymptotic limit using results from hidden word statistics. We show how the analytic-combinatorial methods of Flajolet, Szpankowski and Vall\'ee for dealing with the hidden pattern matching problem can be applied to resolve the case of fixed output length and n→∞, by obtaining estimates for the entropy in terms of the moments of the posterior distribution and establishing its minimization via a measure of autocorrelation. [less ▲]

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See detailCARRIER GRAPHS FOR REPRESENTATIONS OF THE RANK TWO FREE GROUP INTO ISOMETRIES OF HYPERBOLIC THREE SPACE
Tan, Ser Peow; Xu, Binbin UL

E-print/Working paper (2018)

Carrier graphs were first introduced for closed hyperbolic 3-manifolds by White. In this paper, we first generalize this definition to carrier graphs for representations of a rank two free group into the ... [more ▼]

Carrier graphs were first introduced for closed hyperbolic 3-manifolds by White. In this paper, we first generalize this definition to carrier graphs for representations of a rank two free group into the isometry group of hyperbolic three space. Then we prove the existence and the finiteness of minimal carrier graphs for those representations which are discrete, faithful and geometrically finite, and more generally, those that satisfy certain finiteness conditions first introduced by Bowditch. [less ▲]

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See detailBetween European Precaution and National Compensation : The Disourses of Risk Management A Critical Analysis of Giovanni Pesce and Others v. Presidenza del Consiglio dei Ministri – Dipartimento della Protezione Civile and Others
Dufour, Pascale UL

E-print/Working paper (2018)

Contemporary society can undisputably be characterized, following Ulrich Beck, as a risk society. Indeed, catastrophic risks multiply themselves, and hence also need to be managed. This paper addresses ... [more ▼]

Contemporary society can undisputably be characterized, following Ulrich Beck, as a risk society. Indeed, catastrophic risks multiply themselves, and hence also need to be managed. This paper addresses more generally the question of how and by whom decision making regarding risk management is made in the European Union. More precisely, it provides a critical analysis of the legal discourse, on the one hand, on the use of the precautionary principle in risk management, and, on the other hand, on compensation of individuals that suffer financial losses related to decisions that are taken on the behalf of this principle. This critic will here be illustrated through an analysis of the Giovanni Pesce and Others v. Presidenza del Consiglio dei Ministri – Dipartimento della Protezione Civile and Others case. [less ▲]

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See detailWozu Mittelalterforschung? Zum 30. Jubiläum des CLUDEM
Pauly, Michel UL

E-print/Working paper (2018)

Detailed reference viewed: 37 (2 UL)
See detailProperness for circle packings and Delaunay circle patterns on complex projective structures
Schlenker, Jean-Marc UL; Yarmola, Andrew UL

E-print/Working paper (2018)

We consider circle packings and, more generally, Delaunay circle patterns - arrangements of circles arising from a Delaunay decomposition of a finite set of points - on surfaces equipped with a complex ... [more ▼]

We consider circle packings and, more generally, Delaunay circle patterns - arrangements of circles arising from a Delaunay decomposition of a finite set of points - on surfaces equipped with a complex projective structure. Motivated by a conjecture of Kojima, Mizushima and Tan, we prove that the forgetful map sending a complex projective structure admitting a circle packing with given nerve (resp. a Delaunay circle pattern with given nerve and intersection angles) to the underlying complex structure is proper. [less ▲]

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See detailWWI: Kosakenmütze und roter Stern: Russische Gefangene in Luxemburg 1918
Ganschow, Inna UL

E-print/Working paper (2018)

Die vorliegende Teiluntersuchung beschäftigt sich mit den 3.100 russischen Kriegsgefangenen, die 1918 Luxemburg passierten. Etwa 300 blieben nachweislich in Luxemburg, da die sowjetische Ideologie in ... [more ▼]

Die vorliegende Teiluntersuchung beschäftigt sich mit den 3.100 russischen Kriegsgefangenen, die 1918 Luxemburg passierten. Etwa 300 blieben nachweislich in Luxemburg, da die sowjetische Ideologie in ihrer neuen Heimat, die nun Russische Sowjetische Föderative Sozialistische Republik hieß, sie nicht ansprach. In einer mikrohistorischen Perspektive werden mehrere Schicksale vorgeführt, anhand derer man zum einen die Bedingungen dieser Emigration versteht, die sich zwar auf neutralen Boden vollzog, jedoch unter der stetigen Verfolgung durch die deutsche Armee, die die Unabhängigkeit Luxemburgs wenig kümmerte. Zum anderen wird gezeigt, wie “Russisch” immer mehr mit “Kommunistisch” assoziiert wurde und alle Russen unter Verdacht standen, “rot” zu sein. [less ▲]

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See detailComposable, Unconditionally Secure Message Authentication without any Secret Key
Ostrev, Dimiter UL

E-print/Working paper (2018)

We consider a setup in which the channel from Alice to Bob is less noisy than the channel from Eve to Bob. We show that there exist encoding and decoding which accomplish error correction and ... [more ▼]

We consider a setup in which the channel from Alice to Bob is less noisy than the channel from Eve to Bob. We show that there exist encoding and decoding which accomplish error correction and authentication simultaneously; that is, Bob is able to correctly decode a message coming from Alice and reject a message coming from Eve with high probability. The system does not require any secret key shared between Alice and Bob, provides information theoretic security, and can safely be composed with other protocols in an arbitrary context. [less ▲]

Detailed reference viewed: 17 (2 UL)
See detailMore Necessary and Less Sufficient: An Age-Period-Cohort Approach to Overeducation in Comparative Perspective
Bar-Haim, Eyal UL; Chauvel, Louis UL; Hartung, Anne UL

E-print/Working paper (2018)

In many countries, the skilled labor market has lagged behind educational expansion. As a result of increased competition, younger cohorts of the highly educated face decreasing returns to education or ... [more ▼]

In many countries, the skilled labor market has lagged behind educational expansion. As a result of increased competition, younger cohorts of the highly educated face decreasing returns to education or overeducation. Surprisingly, decreasing occupational outcomes do not coincide empirically with the economic returns among those with tertiary education. Regarding the process of changes in economic returns to education based on cohort transformations, we expect that the expansion of tertiary education affects specific cohorts, which find themselves facing more labor market competition. As a result, the economic returns to education should decrease over cohorts even though they remain stable and even increase during the same period. To study this process, we model economic returns with a new Age-Period- Cohort-Trended-Lag (APCTLAG) method, which allows comparing the gap in economic returns between tertiary and less than tertiary education over cohorts. Using the Luxembourg Income Study (LIS), we analyze trends over three decades in 12 countries. Our results confirm that educational returns for tertiary education have declined over time, even though the gap between the educated and the less educated has remained similar in most of the countries. For younger cohorts, tertiary education has become more necessary to survive in the competitive labor market, but the actual economic returns to it have decreased - making tertiary education less sufficient than before. [less ▲]

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See detailLe régime d’Etat providence joue un rôle dans le bien-être
Samuel, Robin UL; Hadjar, Andreas UL; Brunel, Valentin

E-print/Working paper (2018)

Detailed reference viewed: 24 (6 UL)
See detailThe Paradoxical Case Against Interest Rate Caps for Microfinance – And: How FinTech and RegTech Resolve the Dilemma
Zetzsche, Dirk Andreas UL; Dewi, Tsany Ratna UL

E-print/Working paper (2018)

Since 2010 approximately 40 developing countries and transitional economies imposed interest rate caps. This article analyses the impact of these interest rate caps on microfinance institutions ... [more ▼]

Since 2010 approximately 40 developing countries and transitional economies imposed interest rate caps. This article analyses the impact of these interest rate caps on microfinance institutions. Introducing the taxonomy of soft, mezzo and hard interest rate caps we take a stance against hard interest rate caps arguing that the downsides of such hard caps outweight the benefits. Our article is structured as follows: In Pt. II we show that regulatory materials published in the context of cap implementation reveals four justifications for imposing interest rate caps, including consumer and client protection, fraud prevention and exploitation by deceptive credit providers, support for a particular strategic industry or sector, and combating anti-competitive behavior where the costs of credit exceed the actual cost of lending plus a reasonable profit margin. In Pt. III. to V. we argue that these arguments do not justify the imposition of hard interest rate caps: In Pt. III. we challenge each of the four arguments, arguing that hard interest rate caps, as one-size-fits-all solutions are too blunt an instrument to distinguish between the different service levels and industry environments in which microfinance institutions operate. In Pt IV. we outline that hard interest rate caps prompt two unwanted consequences instead: increasing the importance of the informal credit sector, and furthering the microfinance institution's mission drift. In Pt. V. we also show that the comparison with Northern low-interest economies is flawed. Drawing on financial and regulatory technologies we develop alternative solutions in Part VI. First, the most adequate way to reduce too high interest rates is furthering competition among all institutions that could provide credit. Rather than distinguishing between regulated banks, microfinance institutions and mobile money and lending providers all of these three groups constitute the respective credit market, and competition between the three branches of credit markets is, in principle, desirable, if the policy objective is competition on the merits. This requires the development of well function credit registers, disclosure of effective interest rates and the facilitation of digital financial services. Pt. VII. concludes. [less ▲]

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See detailThe Global Triumph of the Research University: A Driving Force of Science Production
Baker, David P.; Dusdal, Jennifer UL; Powell, Justin J W UL et al

E-print/Working paper (2018)

The demand for higher education in countries around the world has never been higher. This increase in education levels has generated many benefits to society, including more knowledgeable citizens ... [more ▼]

The demand for higher education in countries around the world has never been higher. This increase in education levels has generated many benefits to society, including more knowledgeable citizens, advanced economies, and enhanced longevity. We have also seen countries and universities invest heavily in science, technology, engineering, and mathematics (STEM), including health (STEM+) research and scientific output. This has resulted in unexpected pure exponential growth in science production around the world. Increased competition, as well as boundary-spanning collaborations, drive unprecedented scientific advancement and technological innovation. In a book entitled The Century of Science: The Global Triumph of the Research University, we explore global scientific developments from the early 20th century to today. University-based research, especially, has risen globally to become the driving force of science production in STEM+ fields. Universities, with their multiple missions of research, teaching, and public service, are uniquely positioned to contribute to scientific output while simultaneously producing the next generation of scientists. [less ▲]

Detailed reference viewed: 81 (10 UL)
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See detailDelaunay Triangulations of Points on Circles
despré, vincent; devillers, olivier; Parlier, Hugo UL et al

E-print/Working paper (2018)

Delaunay triangulations of a point set in the Euclidean plane are ubiquitous in a number of computational sciences, including computational geometry. Delaunay triangulations are not well defined as soon ... [more ▼]

Delaunay triangulations of a point set in the Euclidean plane are ubiquitous in a number of computational sciences, including computational geometry. Delaunay triangulations are not well defined as soon as 4 or more points are concyclic but since it is not a generic situation, this difficulty is usually handled by using a (symbolic or explicit) perturbation. As an alternative, we propose to define a canonical triangulation for a set of concyclic points by using a max-min angle characterization of Delaunay triangulations. This point of view leads to a well defined and unique triangulation as long as there are no symmetric quadruples of points. This unique triangulation can be computed in quasi-linear time by a very simple algorithm. [less ▲]

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Peer Reviewed
See detailConnecting Personal Data of Third Country Nationals: Interoperability of EU Databases in the Light of the CJEU's Case Law on Data Retention
Quintel, Teresa Alegra UL

E-print/Working paper (2018)

On 12 December 2017, the EU Commission presented a proposal on the interoperability of EU large-scale Information Systems. The proposal seeks to enable all centralised EU databases for security, border ... [more ▼]

On 12 December 2017, the EU Commission presented a proposal on the interoperability of EU large-scale Information Systems. The proposal seeks to enable all centralised EU databases for security, border and migration management to be interconnected by 2020. The underlying IT systems retain data of Third Country Nationals (TCNs), namely travellers, applicants for international protection, information relating to visa applications or data on missing persons and criminals. With the proposal, the Commission seeks to create new possibilities to exchange information, manage migration challenges and to enhance the Union’s internal security. The interconnectivity of databases would introduce fundamental changes to the current structure of EU IT-systems and requires careful consideration and assessment of compliance with EU data protection standards. This also means that access to information in an interoperable system must be strictly aligned to the access rights of the underlying databases and that requesting authorities only obtain the data that they are authorized to access. With interoperability, data once held in silos would be retained in three new centralized databases and would be more easily accessible, also for the prevention, investigation and prosecution of crime. Where criminal investigations previously required multiple searches in separate databases, this cascading safeguard shall progressively be abandoned to streamline access to personal data by law enforcement authorities. Despite simplified access conditions, this would require new types of processing operations for which the interoperability proposal does not provide a legal basis. During recent years, several judgments of the Court of Justice of the European Union (CJEU) have highlighted the difficulty of striking a proper balance between the fundamental rights to privacy and data protection, enshrined in Article 7 and 8 of the Charter of Fundamental Rights of the European Union (EU Charter) with an increased demand for security and the surveillance of potential criminals. The Court repeatedly pointed out the need to strike a fair balance between these (allegedly) competing interests and emphasised that law enforcement authorities should not be granted access to personal data without prior authorization. Using the CJEU’s judgments as vehicle and considering the assumption that TCNs risk to become subject to data retention measures in a disproportionate manner, the following analysis seeks to assess both existing EU databases and their foreseen interoperability against the requirements established by the Court in order to evaluate their (in)-compatibility with the fundamental rights standards enshrined in the EU Charter. [less ▲]

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See detailHolomorphic Frobenius actions for DQ-modules
Petit, François UL

E-print/Working paper (2018)

Given a complex manifold endowed with a Gm-action and a DQ-algebra equipped with a compatible holomorphic Frobenius action (F-action), we prove that if the Gm-action is free and proper, then the category ... [more ▼]

Given a complex manifold endowed with a Gm-action and a DQ-algebra equipped with a compatible holomorphic Frobenius action (F-action), we prove that if the Gm-action is free and proper, then the category of F-equivariant DQ-modules is equivalent to the category of modules over the sheaf of invariant sections of the DQ-algebra. As an application, we deduce the codimension three conjecture for formal microdifferential modules from the one for DQ-modules on a symplectic manifold. [less ▲]

Detailed reference viewed: 25 (2 UL)
See detailBayesian variable selection in linear dynamical systems
Aalto, Atte UL; Goncalves, Jorge UL

E-print/Working paper (2018)

We develop a method for reconstructing regulatory interconnection networks between variables evolving according to a linear dynamical system. The work is motivated by the problem of gene regulatory ... [more ▼]

We develop a method for reconstructing regulatory interconnection networks between variables evolving according to a linear dynamical system. The work is motivated by the problem of gene regulatory network inference, that is, finding causal effects between genes from gene expression time series data. In biological applications, the typical problem is that the sampling frequency is low, and consequentially the system identification problem is ill-posed. The low sampling frequency also makes it impossible to estimate derivatives directly from the data. We take a Bayesian approach to the problem, as it offers a natural way to incorporate prior information to deal with the ill-posedness, through the introduction of sparsity promoting prior for the underlying dynamics matrix. It also provides a framework for modelling both the process and measurement noises. We develop Markov Chain Monte Carlo samplers for the discrete-valued zero-structure of the dynamics matrix, and for the continuous-time trajectory of the system. [less ▲]

Detailed reference viewed: 85 (10 UL)
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See detailFrom Clustering Supersequences to Entropy Minimizing Subsequences for Single and Double Deletions
Atashpendar, Arash UL; Beunardeau, Marc; Connolly, Aisling et al

E-print/Working paper (2018)

A binary string transmitted via a memoryless i.i.d. deletion channel is received as a subsequence of the original input. From this, one obtains a posterior distribution on the channel input, corresponding ... [more ▼]

A binary string transmitted via a memoryless i.i.d. deletion channel is received as a subsequence of the original input. From this, one obtains a posterior distribution on the channel input, corresponding to a set of candidate supersequences weighted by the number of times the received subsequence can be embedded in them. In a previous work it is conjectured on the basis of experimental data that the entropy of the posterior is minimized and maximized by the constant and the alternating strings, respectively. In this work, in addition to revisiting the entropy minimization conjecture, we also address several related combinatorial problems. We present an algorithm for counting the number of subsequence embeddings using a run-length encoding of strings. We then describe methods for clustering the space of supersequences such that the cardinality of the resulting sets depends only on the length of the received subsequence and its Hamming weight, but not its exact form. Then, we consider supersequences that contain a single embedding of a fixed subsequence, referred to as singletons, and provide a closed form expression for enumerating them using the same run-length encoding. We prove an analogous result for the minimization and maximization of the number of singletons, by the alternating and the uniform strings, respectively. Next, we prove the original minimal entropy conjecture for the special cases of single and double deletions using similar clustering techniques and the same run-length encoding, which allow us to characterize the distribution of the number of subsequence embeddings in the space of compatible supersequences to demonstrate the effect of an entropy decreasing operation. [less ▲]

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See detailLimit theorems for symmetric U-statistics using contractions
Döbler, Christian UL; Peccati, Giovanni UL

E-print/Working paper (2018)

Detailed reference viewed: 66 (3 UL)
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See detailEnergy efficiency optimization in MIMO interference channels: A successive pseudoconvex approximation approach
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

E-print/Working paper (2018)

Detailed reference viewed: 285 (43 UL)
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See detailDigitalisierung der Arbeit in Luxemburg - Teil 3
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Arbeitnehmer unterscheiden sich hinsichtlich dem Grad durch den ihre Arbeit von der Digitalisierung betroffen ist sowie durch die Auswirkungen, die die Digitalisierung auf ihre Arbeit und ihr Arbeits(er ... [more ▼]

Arbeitnehmer unterscheiden sich hinsichtlich dem Grad durch den ihre Arbeit von der Digitalisierung betroffen ist sowie durch die Auswirkungen, die die Digitalisierung auf ihre Arbeit und ihr Arbeits(er)leben haben. Arbeitnehmer, deren Arbeit stärker durch die Digitalisierung beeinflusst ist, erleben tendenziell mehr Partizipation, Feedback und Autonomie auf ihrer Arbeit. Gleichzeitig weisen sie auch mehr emotionale und mentale Anforderungen, sowie mehr Zeitdruck auf. Arbeitnehmer, deren Arbeit nur in geringem Maß von der Digitalisierung betroffen ist, sind dagegen weniger von emotionalen und mentalen Anforderungen, sowie von Zeitdruck, Konkurrenz und Mobbing betroffen. Insbesondere die geringere Planbarkeit von Arbeitszeit und Freizeit sowie die stärkere Überwachung und Kontrolle der Arbeitsleistung sind negative Konsequenzen der Digitalisierung, die zu einem verstärkten Erleben von emotionalen und mentalen Anforderungen sowie von Zeitdruck, Konkurrenz und Mobbing führt. Die Möglichkeit durch die Digitalisierung auch von zuhause oder von unterwegs arbeiten zu können führt einerseits zu mehr wahrgenommener Autonomie, andererseits ist dieses Potenzial der Digitalisierung auch mit negativen Konsequenzen verknüpft (z.B. erhöhter Zeitdruck). [less ▲]

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See detailDigitalisierung der Arbeit in Luxemburg - Teil 2
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Arbeitnehmer mit höherer formaler Bildung sowie Arbeitnehmer, die als Manager und Führungskräfte, in akademischen Berufen, als Techniker und als Bürokräfte arbeiten, berichten eher von einer gestiegenen ... [more ▼]

Arbeitnehmer mit höherer formaler Bildung sowie Arbeitnehmer, die als Manager und Führungskräfte, in akademischen Berufen, als Techniker und als Bürokräfte arbeiten, berichten eher von einer gestiegenen Entscheidungsfreiheit, von geringerer körperlicher Belastung, von mehr Aufgaben, von der Notwendigkeit ständiger Weiterentwicklung der eigenen Fähigkeiten sowie einer erhöhten Arbeitsleistung durch die Digitalisierung. Insbesondere Hilfsarbeitskräfte geben seltener an sowohl von den Vorteilen aus auch von den Nachteilen der Digitalisierung betroffen zu sein. Differenziert nach Geschlecht oder nach Alter ergeben sich oft nur geringfügige Unterschiede. [less ▲]

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See detailDigitalisierung der Arbeit in Luxemburg - Teil 1
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Die Digitalisierung steht derzeit im Fokus der öffentlichen und politischen Debatte. Im Folgenden wird dargestellt, wie Arbeitnehmer in Luxemburg ihre Arbeit durch die Digitalisierung beeinflusst sehen ... [more ▼]

Die Digitalisierung steht derzeit im Fokus der öffentlichen und politischen Debatte. Im Folgenden wird dargestellt, wie Arbeitnehmer in Luxemburg ihre Arbeit durch die Digitalisierung beeinflusst sehen. Hierbei werden die verschiedenen Formen der Digitalisierung sowie die Angst durch den technischen Fortschritt seinen Arbeitsplatz zu verlieren näher beleuchtet. Manager und Führungskräfte, Arbeitnehmer in akademischen Berufen, Techniker sowie Bürokräfte konstatieren einen starken Einfluss der Digitalisierung auf ihre Arbeit. Diese Einschätzung fällt für Arbeitnehmer in Dienstleistungs- und in Handwerksberufen sowie für Bedienern von Anlagen und Hilfsarbeitskräfte moderater aus. Während Manager und Führungskräfte, sowie Arbeitnehmer in akademischen Berufen vor allem die Bedeutung von elektronischer Kommunikation und unterstützender elektronischer Geräte hervorheben, kommt für Techniker und Arbeitnehmer in Handwerksberufen auch noch das Arbeiten mit computergesteuerten Maschinen oder Robotern hinzu. Die mit der Digitalisierung und dem technischen Fortschritt häufig debattierte Angst vor Arbeitsplatzverlust ist insgesamt moderat ausgeprägt. Etwas stärker ist diese bei Arbeitnehmern der Altersgruppe ab 35 Jahren sowie bei Bedienern von Anlagen und Bürokräften ausgeprägt. [less ▲]

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See detailBrexit Seen from Luxembourg
Högenauer, Anna-Lena UL

E-print/Working paper (2018)

Detailed reference viewed: 43 (6 UL)
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See detailDemographics and FDI: Lessons from China's One-Child Policy
Donaldson, John B.; Koulovatianos, Christos UL; Li, Jian et al

E-print/Working paper (2018)

Lucas (1990) argues that the neoclassical adjustment process fails to explain the relative paucity of FDI inflows from rich to poor countries. In this paper we consider a natural experiment: using China ... [more ▼]

Lucas (1990) argues that the neoclassical adjustment process fails to explain the relative paucity of FDI inflows from rich to poor countries. In this paper we consider a natural experiment: using China as the treated country and India as the control, we show that the dynamics of the relative FDI flows subsequent to the implementation of China's one-child policy, as seen in the data, are consistent with neoclassical fundamentals. In particular, following the introduction of the one-child policy in China, the capital-labor (K/L) ratio of China increased relative to that of India, and, simultaneously, relative FDI inflows into China vs. India declined. These observations are explained in the context of a simple neoclassical OLG paradigm. The adjustment mechanism works as follows: the reduction in the (urban) labor force due to the one-child policy increases the savings per capita. This increases the K/L ratio and reduces the marginal product of capital (MPK). The reduction in MPK (relative to India) reduces the relative attractiveness of investment in China and is thus associated with lower FDI/GDP ratios. Our paper contributes to the nascent literature exploring demographic transitions and their effects on FDI flows. [less ▲]

Detailed reference viewed: 73 (12 UL)
Peer Reviewed
See detailFragebogen HBSC 2018 (enseignement fondamental)
Heinz, Andreas UL

E-print/Working paper (2018)

Detailed reference viewed: 72 (11 UL)
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See detailAlonso and the scaling of urban profiles
Delloye, Justin; Lemoy, Rémi UL; Caruso, Geoffrey UL

E-print/Working paper (2018)

Urban characteristics scaling with total population has become an important urban research field since one needs to better understand the benefits and disadvantages of urban growth and fur- ther ... [more ▼]

Urban characteristics scaling with total population has become an important urban research field since one needs to better understand the benefits and disadvantages of urban growth and fur- ther population concentration. Urban scaling research, however, is largely disconnected from the empirics and theory of intra-urban structure for it considers averaged attributes and ignores resi- dential choice trade-offs between transport and housing costs within cities. Using this fundamental trade-off, the monocentric model of Alonso provides theory to urban density profiles. However, it is silent about how these profiles scale with population, thus preventing empirical scaling studies to anchor in a strong micro-economic theory. This paper fixes this gap by introducing power laws for land and for population density in the Alonso model. From an augmented model with land use, we derive the conditions at which equilibrium profiles match recent empirical findings about the scaling of urban land and population density profiles in European cities. We find that the Alonso model is theoretically compatible with the observed scaling of population density profiles and leads to a satisfactory representation of European cities. The conditions for this compatibility refine current understanding of wage and transport costs elasticities with population. Although they require a scaling power of the profile of the share of urbanised land that is different from what is observed, it is argued that alternatives specifications of transport cost functions could solve this issue. Thus our results call for revisiting theories about land development and housing processes as well as the empirics of agglomeration benefits and transport costs. [less ▲]

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See detailFragebogen HBSC 2018 (enseignement secondaire)
Heinz, Andreas UL

E-print/Working paper (2018)

Detailed reference viewed: 35 (3 UL)
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See detailProp of ribbon hypergraphs and strongly homotopy involutive Lie bialgebras
Merkulov, Sergei UL

E-print/Working paper (2018)

For any integer d we introduce a prop RHrad of d-oriented ribbon hypergraphs (in which "edges" can connect more than two vertices) and prove that there exists a canonical morphism Holieb⋄d⟶RHrad from the ... [more ▼]

For any integer d we introduce a prop RHrad of d-oriented ribbon hypergraphs (in which "edges" can connect more than two vertices) and prove that there exists a canonical morphism Holieb⋄d⟶RHrad from the minimal resolution Holieb⋄d of the (degree shifted) prop of involutive Lie bialgebras into the prop of ribbon hypergraphs which is non-trivial on each generator of Holieb⋄d. As an application we show that for any graded vector space W equipped with a family of cyclically (skew)symmetric higher products the associated vector space of cyclic words in elements of W has a combinatorial Holieb⋄d-structure. As an illustration we construct for each natural number N≥1 an explicit combinatorial strongly homotopy involutive Lie bialgebra structure on the vector space of cyclic words in N graded letters which extends the well-known Schedler's necklace Lie bialgebra structure from the formality theory of the Goldman-Turaev Lie bialgebra in genus zero. [less ▲]

Detailed reference viewed: 35 (0 UL)
See detail« Aus dem Wartezimmer des Krieges »: The Non-Experience of World War One in Luxembourg
Millim, Anne-Marie UL

E-print/Working paper (2018)

This article aims to contribute to the reconstruction of Luxembourg’s war experience and to analyse Weber’s literary and theoretical renditions of these events. It will investigate Weber’s experience of ... [more ▼]

This article aims to contribute to the reconstruction of Luxembourg’s war experience and to analyse Weber’s literary and theoretical renditions of these events. It will investigate Weber’s experience of non-experience and highlight the ways in which he sought to describe and overcome the sense of ineffectuality and uselessness that came with being ‘put on hold’ by the war as a nation and as a human being. Weber’s reflections mix physical, mental, and intellectual pain, creating a sense of absurdist, non-productive suffering, which he, with wavering conviction, seeks to counteract by drawing on the physicality of the personal and collective body. [less ▲]

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See detailHeterogeneity in Conformism, Firm Selection, and Home Bias
Picard, Pierre M UL; Kichko, Sergey

E-print/Working paper (2018)

This paper discusses the impact of conformism on product quality, firm selection, and trade patterns. It shows that when consumers have a higher degree of conformism and/or their distribution of ... [more ▼]

This paper discusses the impact of conformism on product quality, firm selection, and trade patterns. It shows that when consumers have a higher degree of conformism and/or their distribution of conformism becomes more concentrated, the equilibrium average demand falls while product quality rises in a closed economy. In an international trade context, this strengthens the home consumption bias when consumers conform to the behavior of local people. The home bias is mitigated under globalization where individuals tend to conform to people worldwide. The paper also discusses the conditions under which conformism and conspicuousness are reconciled. [less ▲]

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See detailPositiv desintegriert: Krise als Chance
Baudson, Tanja Gabriele UL

E-print/Working paper (2018)

Detailed reference viewed: 29 (1 UL)
See detailContinuous time Gaussian process dynamical models in gene regulatory network inference
Aalto, Atte UL; Viitasaari, Lauri; Ilmonen, Pauliina et al

E-print/Working paper (2018)

One of the focus areas of modern scientific research is to reveal mysteries related to genes and their interactions. The dynamic interactions between genes can be encoded into a gene regulatory network ... [more ▼]

One of the focus areas of modern scientific research is to reveal mysteries related to genes and their interactions. The dynamic interactions between genes can be encoded into a gene regulatory network (GRN), which can be used to gain understanding on the genetic mechanisms behind observable phenotypes. GRN inference from time series data has recently been a focus area of systems biology. Due to low sampling frequency of the data, this is a notoriously difficult problem. We tackle the challenge by introducing the so-called continuous-time Gaussian process dynamical model (GPDM), based on Gaussian process framework that has gained popularity in nonlinear regression problems arising in machine learning. The model dynamics are governed by a stochastic differential equation, where the dynamics function is modelled as a Gaussian process. We prove the existence and uniqueness of solutions of the stochastic differential equation. We derive the probability distribution for the Euler discretised trajectories and establish the convergence of the discretisation. We develop a GRN inference method based on the developed framework. The method is based on MCMC sampling of trajectories of the GPDM and estimating the hyperparameters of the covariance function of the Gaussian process. Using benchmark data examples, we show that our method is computationally feasible and superior in dealing with poor time resolution. [less ▲]

Detailed reference viewed: 26 (4 UL)
See detailLa réponse au défi migratoire : «Europe souveraine» ou «souverainisme de repli» ?
Gatti, Mauro UL

E-print/Working paper (2018)

La migration est probablement le « défi majeur » de l’Europe, aujourd’hui et dans les années qui viennent, comme le reconnaît Emmanuel Macron dans son discours de la Sorbonne de septembre 2017. On peut ... [more ▼]

La migration est probablement le « défi majeur » de l’Europe, aujourd’hui et dans les années qui viennent, comme le reconnaît Emmanuel Macron dans son discours de la Sorbonne de septembre 2017. On peut noter, par ailleurs, que la gestion de ce défi est à présent inadéquate : si 285.000 migrants ont été sauvés par des opérations coordonnées par l’Union européenne, 3.139 sont morts en 2017 ; en outre, l’état des droits des migrants dans l’Union et, surtout, dans les pays partenaires, reste problématique. Le « souverainisme de repli » n’assure aucune solution : « l’Europe seule peut, en un mot, assurer une souveraineté réelle » (Macron). Et la souveraineté de l’Europe – conçue comme la « capacité à exister dans le monde actuel pour y défendre nos valeurs et nos intérêts » – ne peut que s’assurer par la « solidarité » entre les Etats membres. Emmanuel Macron propose deux solutions au défi de la migration, qui paraissent toutefois insuffisantes ou illusoires : la création d’un « espace commun des frontières » vis-à- vis de l’extérieur et une gestion plus efficace de l’asile à l’intérieur de l’Union. [less ▲]

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Peer Reviewed
See detailStein's method for asymmetric alpha-stable distributions, with application to the stable CLT
Chen, Peng; Nourdin, Ivan UL; Xu, Lihu

E-print/Working paper (2018)

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See detailDémographie et migration: Attractivité versus contraction
Nienaber, Birte UL; Hamez, Grégory; Mangels, Kirsten

E-print/Working paper (2018)

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See detailSub-Laplacian comparison theorems on totally geodesic Riemannian foliations
Baudoin, Fabrice; Grong, Erlend; Kuwada, Kazumasa et al

E-print/Working paper (2018)

We develop a variational theory of geodesics for the canonical variation of the metric of a totally geodesic foliation. As a consequence, we obtain comparison theorems for the horizontal and vertical ... [more ▼]

We develop a variational theory of geodesics for the canonical variation of the metric of a totally geodesic foliation. As a consequence, we obtain comparison theorems for the horizontal and vertical Laplacians. In the case of Sasakian foliations, we show that sharp horizontal and vertical comparison theorems for the sub-Riemannian distance may be obtained as a limit of horizontal and vertical comparison theorems for the Riemannian distances approximations. [less ▲]

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See detailTASKS, TECHNOLOGY, AND FACTOR PRICES IN THE NEOCLASSICAL PRODUCTION SECTOR
Irmen, Andreas UL

E-print/Working paper (2018)

This paper introduces tasks into the neoclassical production sector. Competitive firms choose the profit-maximizing amounts of factor-specific tasks that determine their factor demands and output supplies ... [more ▼]

This paper introduces tasks into the neoclassical production sector. Competitive firms choose the profit-maximizing amounts of factor-specific tasks that determine their factor demands and output supplies. We show that the effect of factor-augmenting technical change on relative and absolute factor prices can be decomposed into a productivity effect and a market size effect of opposite sign. These effects appear since the novel task-based approach distinguishes between the demands for tasks and the demands for factors. This perspective provides a new intuition for the emergence of relative and absolute factor biases and the role of the elasticity of substitution. [less ▲]

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See detailDemographie und Migration: Anziehung versus Schrumpfung
Nienaber, Birte UL; Hamez, Grégory; Mangels, Kirsten

E-print/Working paper (2018)

Detailed reference viewed: 24 (1 UL)
Peer Reviewed
See detailSojourn time dimensions of fractional Brownian motion
Nourdin, Ivan UL; Peccati, Giovanni UL; Seuret, Stéphane

E-print/Working paper (2018)

Detailed reference viewed: 32 (4 UL)
Peer Reviewed
See detailContinuous Breuer-Major theorem: tightness and non-stationarity
Campese, Simon UL; Nourdin, Ivan UL; Nualart, David

E-print/Working paper (2018)

Detailed reference viewed: 14 (1 UL)
Peer Reviewed
See detailAsymptotic behaviour of large Gaussian correlated Wishart matrices
Nourdin, Ivan UL; Zheng, Guangqu UL

E-print/Working paper (2018)

Detailed reference viewed: 7 (0 UL)
Peer Reviewed
See detailAlmost sure limit theorems on Wiener chaos: the non-central case
Azmoodeh, Ehsan; Nourdin, Ivan UL

E-print/Working paper (2018)

Detailed reference viewed: 28 (2 UL)
See detailAre Capital Requirements on Small Business Loans Flawed?
Wolff, Christian UL; Bams, Dennis; Magdalena, Pisa

E-print/Working paper (2018)

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See detailTechnological Progress, the Supply ofHours Worked, and the Consumption-Leisure Complementarity
Irmen, Andreas UL

E-print/Working paper (2018)

At least since 1870 hours worked per worker declined and real wages increased in many of today’s industrialized countries. The dual nature of technological progress in conjunction with a consumption ... [more ▼]

At least since 1870 hours worked per worker declined and real wages increased in many of today’s industrialized countries. The dual nature of technological progress in conjunction with a consumption-leisure complementarity explains these stylized facts. Technological progress drives real wages up and expands the amount of available consumption goods. Enjoying consumption goods increases the value of leisure. Therefore, individuals demand more leisure and supply less labor. This mechanism appears in an OLG-model with two-period lived individuals equipped with per-period utility functions of the generalized log-log type proposed by Boppart-Krusell (2016). The optimal plan is piecewise defined and hinges on the wage level. Technological progress moves a poor economy out of a regime with low wages and an inelastic supply of hours worked into a regime where wages increase further and hours worked continuously decline. [less ▲]

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See detailMono-to-multilayer transition in growing bacterial colonies
Sengupta, Anupam UL

E-print/Working paper (2018)

The transition from monolayers to multilayered structures in bacterial colonies is a fundamental step in biofilm development. Observed across different morphotypes and species, this transition is ... [more ▼]

The transition from monolayers to multilayered structures in bacterial colonies is a fundamental step in biofilm development. Observed across different morphotypes and species, this transition is triggered within freely growing bacterial microcolonies comprising a few hundred cells. Using a combination of numerical simulations and analytical modeling, here we demonstrate that this transition originates from the competition between growth-induced in-plane active stresses and vertical restoring forces, due to the cell-substrate interactions. Using a simple chain-like colony of laterally confined cells, we show that the transition is triggered by the mechanical instability of individual cells, thus it is localized and mechanically deterministic. Asynchronous cell division renders the process stochastic, so that all the critical parameters that control the onset of the transition are continuously distributed random variables. Upon modeling cell division as a Poisson process, we can approximately calculate the probability distribution function of the position and time associated with the first extrusion. The rate of such a Poisson process can be identified as the order parameter of the transition, thus highlighting its mixed deterministic/stochastic nature. [less ▲]

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See detailConcentration of the Intrinsic Volumes of a Convex Body
Lotz, Martin; McCoy, Michael B.; Nourdin, Ivan UL et al

E-print/Working paper (2018)

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See detailIncome Inequality, Productivity, and International Trade
Picard, Pierre M UL; Hsu, Wen-Tai; Lin, Lu

E-print/Working paper (2018)

This paper discusses the effect of income inequality on selection and aggregate productivity in a general equilibrium model with non-homothetic preferences. It shows the existence of a negative ... [more ▼]

This paper discusses the effect of income inequality on selection and aggregate productivity in a general equilibrium model with non-homothetic preferences. It shows the existence of a negative relationship between the number and quantity of products consumed by an income group and the earnings of other income groups. It also highlights the negative effect of a mean-preserving spread of income on aggregate productivity through the softening of firms’ selection. This effect is however mitigated in the presence of international trade. In a quantitative analysis, it is shown that an excessively large mean-preserving spread of income may harm the rich as it raises firms’ markups on their purchases. This is contrary to the general belief that income inequality benefits the rich. [less ▲]

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See detailAccounting for Differences in Income Inequality across Countries: Ireland and the United Kingdom
Sologon, Denisa M.; Van Kerm, Philippe UL; Li, Jinjing et al

E-print/Working paper (2018)

This paper proposes a framework for studying international differences in the distribution of household income. Integrating micro-econometric and micro-simulation approaches in a decomposition analysis it ... [more ▼]

This paper proposes a framework for studying international differences in the distribution of household income. Integrating micro-econometric and micro-simulation approaches in a decomposition analysis it quantifies the role of tax-benefit systems, employment and occupational structures, labour prices and market returns, and demographic composition in accounting for differences in income inequality across countries. Building upon EUROMOD (the European tax-benefit calculator) and its harmonized datasets, the model is portable and can be implemented for any cross-country comparisons within the EU. An application to the UK and Ireland--two countries that have much in common while displaying different levels of inequality--shows that differences in tax-benefit rules between the two countries account for roughly half of the observed difference in disposable household income inequality. Demographic differences play negligible roles. The Irish tax-benefit system is more redistributive than UK's due to a higher tax progressivity and higher average transfer rates. These are largely attributable to policy parameter differences, but also to differences in pre-tax, pre-transfer income distributions. [less ▲]

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See detailEntwicklungen der Trans*-Bewegung in der Bundesrepublik Deutschland
De Silva, Adrian UL

E-print/Working paper (2018)

Detailed reference viewed: 86 (27 UL)
See detailFirst Experiments with a Flexible Infrastructure for Normative Reasoning
Benzmüller, Christoph UL; Parent, Xavier UL

E-print/Working paper (2018)

A flexible infrastructure for normative reasoning is outlined. A small-scale demonstrator version of the envisioned system has been implemented in the proof assistant Isabelle/HOL by utilising the first ... [more ▼]

A flexible infrastructure for normative reasoning is outlined. A small-scale demonstrator version of the envisioned system has been implemented in the proof assistant Isabelle/HOL by utilising the first authors universal logical reasoning approach based on shallow semantical embeddings in meta-logic HOL. The need for such a flexible reasoning infrastructure is motivated and illustrated with a contrary-to-duty example scenario selected from the General Data Protection Regulation. [less ▲]

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See detailI/O Logic in HOL --- First Steps
Benzmüller, Christoph UL; Parent, Xavier UL

E-print/Working paper (2018)

A semantical embedding of input/output logic in classical higher-order logic is presented. This embedding enables the mechanisation and automation of reasoning tasks in input/output logic with off-the ... [more ▼]

A semantical embedding of input/output logic in classical higher-order logic is presented. This embedding enables the mechanisation and automation of reasoning tasks in input/output logic with off-the-shelf higher-order theorem provers and proof assistants. The key idea for the solution presented here results from the analysis of an inaccurate previous embedding attempt, which we will discuss as well. [less ▲]

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See detailDihedral Universal Deformations
Deo, Shaunak UL; Wiese, Gabor UL

E-print/Working paper (2018)

This article deals with universal deformations of dihedral representations with a particular focus on the question when the universal deformation is dihedral. Results are obtained in three settings: (1 ... [more ▼]

This article deals with universal deformations of dihedral representations with a particular focus on the question when the universal deformation is dihedral. Results are obtained in three settings: (1) representation theory, (2) algebraic number theory, (3) modularity. As to (1), we prove that the universal deformation is dihedral if all infinitesimal deformations are dihedral. Concerning (2) in the setting of Galois representations of number fields, we give sufficient conditions to ensure that the universal deformation relatively unramified outside a finite set of primes is dihedral, and discuss in how far these conditions are necessary. As a side-result, we obtain cases of the unramified Fontaine-Mazur conjecture. As to (3), we prove a modularity theorem of the form `R=T' for parallel weight one Hilbert modular forms for cases when the minimal universal deformation is dihedral. [less ▲]

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See detailCorruption and tax compliance: Evidence from small retailers in Bamako, Mali
Bertinelli, Luisito UL; Bourgain, Arnaud UL; Leon, Florian UL

E-print/Working paper (2018)

We investigate the impact of corruption on tax compliance using a sample of 700 small business in Bamako, Mali. Our results show that paying bribes reduced tax compliance by almost ten percentage points.

Detailed reference viewed: 26 (0 UL)
Peer Reviewed
See detailThe functional Breuer-Major theorem
Nourdin, Ivan UL; Nualart, David

E-print/Working paper (2018)

Detailed reference viewed: 33 (0 UL)
Peer Reviewed
See detailToo Much Unity in the European Union’s External Migration Policy?
Gatti, Mauro UL

E-print/Working paper (2018)

Detailed reference viewed: 29 (3 UL)
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See detailOn the Hilbert eigenvariety at exotic and CM classical weight 1 points
Deo, Shaunak UL; Betina, Adel; Fite, Francesc

E-print/Working paper (2018)

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See detailLocal curvature estimates for the Laplacian flow
Li, Yi UL

E-print/Working paper (2018)

Detailed reference viewed: 72 (8 UL)
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See detailA parallel dual-grid multiscale approach to CFD-DEM couplings
Pozzetti, Gabriele UL; Jasak, Hrvoje; Besseron, Xavier UL et al

E-print/Working paper (2018)

In this work, a new parallel dual-grid multiscale approach for CFD-DEM couplings is investigated. Dual- grid multiscale CFD-DEM couplings have been recently developed and successfully adopted in different ... [more ▼]

In this work, a new parallel dual-grid multiscale approach for CFD-DEM couplings is investigated. Dual- grid multiscale CFD-DEM couplings have been recently developed and successfully adopted in different applications still, an efficient parallelization for such a numerical method represents an open issue. Despite its ability to provide grid convergent solutions and more accurate results than standard CFD-DEM couplings, this young numerical method requires good parallel performances in order to be applied to large-scale problems and, therefore, extend its range of application. The parallelization strategy here proposed aims to take advantage of the enhanced complexity of a dual-grid coupling to gain more flexibility in the domain partitioning while keeping a low inter-process communication cost. In particular, it allows avoiding inter- process communication between CFD and DEM software and still allows adopting complex partitioning strategies thanks to an optimized grid-based communication. It is shown how the parallelized multiscale coupling holds all its natural advantages over a mono-scale coupling and can also have better parallel performance. Three benchmark cases are presented to assess the accuracy and performance of the strategy. It is shown how the proposed method allows maintaining good parallel performance when operated over 1000 processes. [less ▲]

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See detailIsolation of nucleic acids from low biomass samples: detection and removal of sRNA contaminants
Heintz-Buschart, Anna; Yusuf, Dilmurat; Kaysen, Anne UL et al

E-print/Working paper (2017)

Sequencing-based analyses of low-biomass samples are known to be prone to misinterpretation due to the potential presence of contaminating molecules derived from laboratory reagents and environments. Due ... [more ▼]

Sequencing-based analyses of low-biomass samples are known to be prone to misinterpretation due to the potential presence of contaminating molecules derived from laboratory reagents and environments. Due to its inherent instability, contamination with RNA is usually considered to be unlikely. Here we report the presence of small RNA (sRNA) contaminants in widely used microRNA extraction kits and means for their depletion. Sequencing of sRNAs extracted from human plasma samples was performed and significant levels of non-human (exogenous) sequences were detected. The source of the most abundant of these sequences could be traced to the microRNA extraction columns by qPCR-based analysis of laboratory reagents. The presence of artefactual sequences originating from the confirmed contaminants were furthermore replicated in a range of published datasets. To avoid artefacts in future experiments, several protocols for the removal of the contaminants were elaborated, minimal amounts of starting material for artefact-free analyses were defined, and the reduction of contaminant levels for identification of bona fide sequences using 'ultra-clean' extraction kits was confirmed. In conclusion, this is the first report of the presence of RNA molecules as contaminants in laboratory reagents. The described protocols should be applied in the future to avoid confounding sRNA studies. [less ▲]

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See detailData Protection Directive (EU) 2016/680 for Police and Criminal Justice Authorities
Quintel, Teresa Alegra UL; Sajfert, Juraj

E-print/Working paper (2017)

In May 2018, the EU Data Protection Reform became applicable. In particular the General Data Protection Regulation (EU) 2016/679 (GDPR), which repealed Directive 95/46/EC on 25 May 2018 attracted much ... [more ▼]

In May 2018, the EU Data Protection Reform became applicable. In particular the General Data Protection Regulation (EU) 2016/679 (GDPR), which repealed Directive 95/46/EC on 25 May 2018 attracted much attention, albeit resembling its predecessor. Alongside the GDPR, the Reform encompassed a Directive (EU) 2016/680 establishing rules for the protection of individuals with regard to the processing of personal data by competent authorities for purposes of law enforcement (LED). The LED put forth great achievements in areas that had previously not been regulated by EU law. Therefore, the LED constitutes a major step forward in establishing a comprehensive EU data protection regime, as the first horizontal and legally binding instrument laying down the rules for national and cross-border processing of personal data in the area of law enforcement. Although the LED received way less attention than the GDPR, two main objectives of the Directive are too important to be neglected: the increased level of fundamental rights protection in the area of police and criminal justice, and the improved sharing of personal data between the Member States, as they will be able to rely on uniform data protection rules. The LED is a modern instrument, designed for the processing of personal data by Law Enforcement Authorities (LEAs) in the Digital Age, which is why there is no doubt that instruments such as the Directive are rapidly gaining in importance and visibility: firstly, an increased number of criminal acts is being committed online or with the help of online tools. Perpetrators of crime leave digital traces that may support LEAs in their tasks of crime prevention, detection, investigation and prosecution. Secondly, as perpetrators are becoming more tech-savvy, LEAs turned to new investigative techniques, including big data analytics. The term big data police technologies may include predictive systems that identify people or places suspected of crime, surveillance systems to monitor at-risk areas and search systems to mine data for investigative clues or to develop intelligence nets of helpful data for groups or across communities. Thirdly, EU rules on the processing of personal data by LEAs are undergoing consolidation, with the LED acting as a locomotive. The rules of the LED, which had to be transposed into the national laws of all 28 Member States and the four Schengen Area States (Norway, Iceland, Switzerland and Lichtenstein) by 6 May 2018, benefited from the attention given to the GDPR, as some of the Regulation’s solutions could simply be taken over. However, a number of provisions were developed specifically for the LED. This Article will give a general overview of the LED structure, its scope and briefly present the ten chapters. The second part of the Article will address four distinct features enshrined in the LED, focussing on automated individual decision-making (Article 11), the indirect exercise of data subject rights (Article 17), the obligation for competent authorities to keep logs (Article 25) and the provisions on international transfers (Articles 35-39). It will thereby critically assess the articles and point to both similarities and differences with regard to the GDPR. [less ▲]

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See detailInternetdelikte und die Herausforderungen des Forum Shoppings
Schmitz, Sandra UL

E-print/Working paper (2017)

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See detailMechanizing Principia Logico-Metaphysica in Functional Type Theory
Kirchner, Daniel; Benzmüller, Christoph UL; Zalta, Edward N.

E-print/Working paper (2017)

Principia Logico-Metaphysica proposes a foundational logical theory for metaphysics, mathematics, and the sciences. It contains a canonical development of Abstract Object Theory [AOT], a metaphysical ... [more ▼]

Principia Logico-Metaphysica proposes a foundational logical theory for metaphysics, mathematics, and the sciences. It contains a canonical development of Abstract Object Theory [AOT], a metaphysical theory (inspired by ideas of Ernst Mally, formalized by Zalta) that differentiates between ordinary and abstract objects. This article reports on recent work in which AOT has been successfully represented and partly automated in the proof assistant system Isabelle/HOL. [less ▲]

Detailed reference viewed: 38 (3 UL)
See detailFamily, Community and Life-Cycle Earnings: Evidence from Siblings and Youth Peers
Bingley, Paul; Cappellari, Lorenzo; Tatsiramos, Konstantinos UL

E-print/Working paper (2017)

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See detailL'ethnographie du travail
de Saint-Georges, Ingrid UL

E-print/Working paper (2017)

Detailed reference viewed: 34 (2 UL)
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See detailTime Averages of Markov Processes and Applications to Two-Timescale Problems
Pepin, Bob UL

E-print/Working paper (2017)

Detailed reference viewed: 30 (0 UL)
See detail3D Printing: The Next 5 years by Claude Wolf – Into the Future engineered by the Zs
Wolf, Claude UL

E-print/Working paper (2017)

3D Printing: The Next 5 years by Claude Wolf – Into the Future engineered by the Zs The future of 3D Printing or Additive Manufacturing [AM] will be driven by the next generation of engineers who are just ... [more ▼]

3D Printing: The Next 5 years by Claude Wolf – Into the Future engineered by the Zs The future of 3D Printing or Additive Manufacturing [AM] will be driven by the next generation of engineers who are just about to qualify, the Z generation (1994-2010). Do we, educators, know this Z generation? Do we know what motivates them? The Z generation is a generation of digital natives interacting with PCs, iPads, smartphones and the internet since birth, a pragmatic and short term orientated generation. Our prejudice brands them as unprepared and unmotivated, with their 10 second attention spans, but in reality, they have already proven they are creative, determined and hardworking as well as team oriented, when they are given the opportunity. They have understood that 3D printing offers them this opportunity. [less ▲]

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See detailTommaso Padoa-Schioppa [biography]
Chiocchetti, Paolo UL

E-print/Working paper (2017)

Tommaso Padoa-Schioppa (1940-2010) was an Italian banker, economist, and politician. He was one of the "architects of the euro" and helped to push forward the financial, monetary, and economic integration ... [more ▼]

Tommaso Padoa-Schioppa (1940-2010) was an Italian banker, economist, and politician. He was one of the "architects of the euro" and helped to push forward the financial, monetary, and economic integration of Europe. [less ▲]

Detailed reference viewed: 19 (2 UL)