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See detailYolanda von Vianden und das Yolanda-Epos
Sieburg, Heinz UL

E-print/Working paper (in press)

Detailed reference viewed: 95 (7 UL)
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See detailThe edge-based strain smoothing method for compressible and nearly incompressible non-linear elasticity for solid mechanics
Lee, Chang-Kye; Mihai, L. Angela; Kerfriden, Pierre et al

E-print/Working paper (in press)

Detailed reference viewed: 454 (36 UL)
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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 ▲]

Detailed reference viewed: 33 (1 UL)
See detailBORDERS IN THE LIVES OF ASYLUM SEEKERS & REFUGEES IN LUXEMBOURG & METZ
Paraschivescu, Claudia UL

E-print/Working paper (2019)

Detailed reference viewed: 38 (1 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: 50 (5 UL)
Peer Reviewed
See detailScalable Viewing. Digitale Methoden und die Digital Humanities
Pause, Johannes UL; Walkowski, Niels-Oliver UL

E-print/Working paper (2019)

Detailed reference viewed: 8 (0 UL)
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Peer Reviewed
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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Peer Reviewed
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 ▲]

Detailed reference viewed: 30 (3 UL)
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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 ▲]

Detailed reference viewed: 30 (2 UL)
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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 ▲]

Detailed reference viewed: 54 (8 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: 30 (2 UL)
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Peer Reviewed
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 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 ▲]

Detailed reference viewed: 21 (3 UL)
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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 ▲]

Detailed reference viewed: 15 (1 UL)
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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)

Detailed reference viewed: 26 (0 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 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 detailTrigonometry for the multiples of 3 degrees
Perucca, Antonella UL; Stranen, Deborah UL

E-print/Working paper (2019)

Detailed reference viewed: 17 (3 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: 115 (16 UL)
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See detailFunctional inequalities for Feynman-Kac semigroups
Thompson, James UL

E-print/Working paper (2019)

Using stochastic analysis, we prove various gradient estimates and Harnack inequalities for Feynman-Kac semigroups with possibly unbounded potentials. One of the main results is a derivative formula which ... [more ▼]

Using stochastic analysis, we prove various gradient estimates and Harnack inequalities for Feynman-Kac semigroups with possibly unbounded potentials. One of the main results is a derivative formula which can be used to characterize a lower bound on Ricci curvature using a potential. [less ▲]

Detailed reference viewed: 38 (6 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: 104 (18 UL)
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See detailAll quasitrivial n-ary semigroups are reducible to semigroups
Couceiro, Miguel; Devillet, Jimmy UL

E-print/Working paper (2019)

We show that every quasitrivial n-ary semigroup is reducible to a binary semigroup, and we provide necessary and sufficient conditions for such a reduction to be unique. These results are then refined in ... [more ▼]

We show that every quasitrivial n-ary semigroup is reducible to a binary semigroup, and we provide necessary and sufficient conditions for such a reduction to be unique. These results are then refined in the case of symmetric n-ary semigroups. We also explicitly determine the sizes of these classes when the semigroups are defined on finite sets. As a byproduct of these enumerations, we obtain several new integer sequences. [less ▲]

Detailed reference viewed: 63 (8 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 detailExpediting in Two-Echelon Spare Parts Inventory Systems
Drent, Melvin UL; Arts, Joachim UL

E-print/Working paper (2018)

We consider a two-echelon spare parts inventory system consisting of one central warehouse and multiple local warehouses. Each warehouse keeps multiple types of repairable parts to maintain several types ... [more ▼]

We consider a two-echelon spare parts inventory system consisting of one central warehouse and multiple local warehouses. Each warehouse keeps multiple types of repairable parts to maintain several types of capital goods. The local warehouses face Poisson demand and are replenished by the central warehouse. We assume that unsatisfied demand is backordered at all warehouses. Furthermore, we assume deterministic lead times for the replenishments of the local warehouses. The repair shop at the central warehouse has two repair options for each repairable part: a regular repair option and an expedited repair option. Both repair options have stochastic lead times. Irrespective of the repair option, each repairable part uses a certain resource for its repair. Assuming a dual-index policy at the central warehouse and base stock control at the local warehouses, an exact and efficient evaluation procedure for a given control policy is formulated. To find an optimal control policy, we look at the minimization of total investment costs under constraints on both the aggregate mean number of backorders per capital good type and the aggregate mean fraction of repairs that are expedited per repair resource. For this non-linear non-convex integer programming problem, we develop a greedy heuristic and an algorithm based on decomposition and column generation. Both solution approaches perform very well with average optimality gaps of 1.56 and 0.23 percent, respectively, across a large test bed of industrial size. Based on a case study at Netherlands Railways, we show how managers can significantly reduce the investment in repairable spare parts when dynamic repair policies are leveraged to prioritize repair of parts whose inventory is critically low. [less ▲]

Detailed reference viewed: 261 (67 UL)
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See detailClassifications of quasitrivial semigroups
Devillet, Jimmy UL; Marichal, Jean-Luc UL; Teheux, Bruno UL

E-print/Working paper (2018)

We investigate classifications of quasitrivial semigroups defined by certain equivalence relations. The subclass of quasitrivial semigroups that preserve a given total ordering is also investigated. In ... [more ▼]

We investigate classifications of quasitrivial semigroups defined by certain equivalence relations. The subclass of quasitrivial semigroups that preserve a given total ordering is also investigated. In the special case of finite semigroups, we address and solve several related enumeration problems. [less ▲]

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Peer Reviewed
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 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 ▲]

Detailed reference viewed: 89 (19 UL)
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Peer Reviewed
See detailTNFS Resistant Families of Pairing-Friendly Elliptic Curves
Fotiadis, Georgios UL; Konstantinou, Elisavet

E-print/Working paper (2018)

Detailed reference viewed: 24 (7 UL)
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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 detailTägliches Essen von Obst und Gemüse
van Duin, Claire UL; Residori, Caroline UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

Ein hoher Gemüse- und Obstverzehr ist Teil eines gesunden Lebensstils. In der HBSC-Studie 2014 wurden die Schüler daher gefragt, wie häufig sie Obst und Gemüse essen: 37 % gaben an, täglich Obst zu essen ... [more ▼]

Ein hoher Gemüse- und Obstverzehr ist Teil eines gesunden Lebensstils. In der HBSC-Studie 2014 wurden die Schüler daher gefragt, wie häufig sie Obst und Gemüse essen: 37 % gaben an, täglich Obst zu essen und 32 % gaben den täglichen Verzehr von Gemüse an. Schüler der Altersgruppe 11-12 essen häufiger Obst und Gemüse als Schüler im Alter von 13-18. Der tägliche Konsum von Obst und Gemüse ist bei Mädchen häufiger als bei Jungen. Des Weiteren ist der tägliche Konsum bei Schülern aus wohlhabenden Familien weiter verbreitet als bei Schülern aus nicht wohlhabenden Familien. Schüler des Fondamental und des Enseignement secondaire geben einen täglichen Verzehr häufiger an als Schüler des Enseignement secondaire technique und des Modulaire. [less ▲]

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See detailKörperliche Aktivität von Schülern in ihrer Freizeit
Heinz, Andreas UL; Kern, Matthias Robert UL; Residori, Caroline UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden die Schüler gefragt, wie häufig sie in ihrer Freizeit so aktiv sind, dass sie außer Atem oder ins Schwitzen kommen. Rund jeder zehnte Schüler ist nach eigenen Angaben nie ... [more ▼]

In der HBSC-Studie 2014 wurden die Schüler gefragt, wie häufig sie in ihrer Freizeit so aktiv sind, dass sie außer Atem oder ins Schwitzen kommen. Rund jeder zehnte Schüler ist nach eigenen Angaben nie körperlich aktiv, rund jeder sechste ist hingegen an 7 Stunden oder häufiger pro Woche aktiv. Im internationalen Vergleich sind die luxemburgischen Schüler überdurchschnittlich häufig körperlich aktiv. Allerdings nimmt die Aktivität im Laufe der Jugend ab und bestimmte Gruppen sind aktiver als andere: Jungen sind in allen Altersgruppen aktiver als Mädchen und Kinder aus wohlhabenden Familien sind aktiver als Kinder aus nicht wohlhabenden Familien. Schüler des Enseignement secondaire sind aktiver als Schüler des Modulaire. [less ▲]

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See detailMobbing in der Schule
Heinz, Andreas UL; van Duin, Claire UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der Kindheit und Jugend gemobbt zu werden ist ein Risikofaktor für schlechtere Schulleistungen, aber langfristig auch für Angststörungen im Erwachsenenalter. Daher wurde in der HBSC-Studie 2014 gefragt ... [more ▼]

In der Kindheit und Jugend gemobbt zu werden ist ein Risikofaktor für schlechtere Schulleistungen, aber langfristig auch für Angststörungen im Erwachsenenalter. Daher wurde in der HBSC-Studie 2014 gefragt, wie häufig die Schüler in den vergangenen Monaten in der Schule gemobbt wurden. 73 % waren nicht von Mobbing betroffen, 16 % wurden 1- bis 2-mal gemobbt und 11 % wurden mindestens 2-mal pro Monat gemobbt. Ältere Schüler waren seltener Opfer von Mobbing als jüngere Schüler, wobei Jungen und Mädchen in allen Altersgruppen ähnlich häufig betroffen waren. Dementsprechend waren die Schüler des Fondamental und des Modulaire häufiger betroffen als die Schüler des Secondaire technique und des Secondaire. Schüler, die aus Familien mit einem geringen Wohlstandsniveau stammen, waren häufiger Mobbingopfer als Schüler aus wohlhabenden Familien. Mit der Häufigkeit des Mobbings sinkt die Lebenszufriedenheit und die Zahl der Gesundheitsbeschwerden steigt. [less ▲]

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See detailBewertung des Klassenklimas
van Duin, Claire UL; Heinz, Andreas UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 sollten die Schüler die folgende Aussage zum Klassenklima bewerten: „Die meisten Schüler in meiner Klasse sind nett und hilfsbereit.“ 72 % stimmen dieser Aussage zu, 10 % lehnen ... [more ▼]

In der HBSC-Studie 2014 sollten die Schüler die folgende Aussage zum Klassenklima bewerten: „Die meisten Schüler in meiner Klasse sind nett und hilfsbereit.“ 72 % stimmen dieser Aussage zu, 10 % lehnen sie ab und 18 % wählen die neutrale Mittelkategorie. Getrennt nach Alter und Geschlecht zeigen sich kaum Unterschiede im wahrgenommenen Klassenklima. Allerdings bewerten Schüler des Fondamental und des Secondaire das Klassenklima besser als Schüler des Secondaire technique und des Modulaire. Je besser das Klassenklima bewertet wird, desto zufriedener sind die Schüler mit ihrem Leben und desto mehr mögen sie die Schule. [less ▲]

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See detailQualität der Kommunikation in der Familie
Heinz, Andreas UL; Kern, Matthias Robert UL; Residori, Caroline UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 sollten die Schüler vier Aussagen zur Qualität der Kommunikation in ihrer Familie auf einer Skala von 1 (= niedrige Qualität) bis 5 (= hohe Qualität) bewerten. Über 80 % vergeben ... [more ▼]

In der HBSC-Studie 2014 sollten die Schüler vier Aussagen zur Qualität der Kommunikation in ihrer Familie auf einer Skala von 1 (= niedrige Qualität) bis 5 (= hohe Qualität) bewerten. Über 80 % vergeben gute Bewertungen im Bereich von 4 oder 5. Rund 12 % der Schüler bewerten die Qualität der Familienkommunikation im mittleren Bereich (3) und 5 % vergeben niedrige Bewertungen (1 oder 2). Ältere Schüler bewerten die Familienkommunikation schlechter als jüngere. Dementsprechend bewerten Schüler des Fondamental die Familienkommunikation besser als Schüler von Sekundarschulen. Schüler, die eine hohe Qualität angeben, berichten eine geringere Zahl von Gesundheitsbeschwerden. [less ▲]

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See detailFernsehkonsum von Schülern
van Duin, Claire UL; Heinz, Andreas UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden die Schüler gefragt, wie lange sie an einem Wochentag fernsehen. Knapp 8 % geben an, nicht fernzusehen, weitere 19 % schauen eine halbe Stunde fern. 57 % schauen 2 Stunden ... [more ▼]

In der HBSC-Studie 2014 wurden die Schüler gefragt, wie lange sie an einem Wochentag fernsehen. Knapp 8 % geben an, nicht fernzusehen, weitere 19 % schauen eine halbe Stunde fern. 57 % schauen 2 Stunden oder mehr fern, was als häufiger TV-Konsum definiert wird. Bei Schülern im Alter von 13-18 ist häufiger TV-Konsum weiter verbreitet als bei Schülern im Alter von 11-12. Des Weiteren ist häufiger TV-Konsum verbreiteter bei Schülern des Secondaire technique als bei Schülern des Fondamental sowie des Secondaire. Schüler, die davon ausgehen, dass ihre Lehrer sie für leistungsschwach halten, schauen häufiger Fernsehen als Schüler, die denken, dass ihre Lehrer sie für überdurchschnittlich leistungsfähig halten. [less ▲]

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See detailElectryo, In-person Voting with Transparent Voter Verifiability and Eligibility Verifiability
Roenne, Peter UL; Ryan, Peter UL; Zollinger, Marie-Laure UL

E-print/Working paper (2018)

Selene is an e-voting protocol that allows voters to directly check their individual vote, in cleartext, in the final tally via a tracker system, while providing good coercion mitigation. This is in ... [more ▼]

Selene is an e-voting protocol that allows voters to directly check their individual vote, in cleartext, in the final tally via a tracker system, while providing good coercion mitigation. This is in contrast to conventional, end-to-end verifiable schemes in which the voter verifies the presence of an encryption of her vote on the bulletin board. The Selene mechanism can be applied to many e-voting schemes, but here we present an application to the polling station context, resulting in a voter-verifiable electronic tally with a paper audit trail. The system uses a smartcard-based public key system to provide the individual verifica- tion and universal eligibility verifiability. The paper record contains an encrypted link to the voter’s identity, requiring stronger assumptions on ballot privacy than normal paper voting, but with the benefit of pro- viding good auditability and dispute resolution as well as supporting (comparison) risk limiting audits. [less ▲]

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See detailInvariance in a class of operations related to weighted quasi-geometric means
Devillet, Jimmy UL; Matkowski, Janusz

E-print/Working paper (2018)

Let $I\subset (0,\infty )$ be an interval that is closed with respect to the multiplication. The operations $C_{f,g}\colon I^{2}\rightarrow I$ of the form \begin{equation*} C_{f,g}\left( x,y\right) =\left ... [more ▼]

Let $I\subset (0,\infty )$ be an interval that is closed with respect to the multiplication. The operations $C_{f,g}\colon I^{2}\rightarrow I$ of the form \begin{equation*} C_{f,g}\left( x,y\right) =\left( f\circ g\right) ^{-1}\left( f\left( x\right) \cdot g\left( y\right) \right) \text{,} \end{equation*} where $f,g$ are bijections of $I$ are considered. Their connections with generalized weighted quasi-geometric means is presented. It is shown that invariance\ question within the class of this operations leads to means of iterative type and to a problem on a composite functional equation. An application of the invariance identity to determine effectively the limit of the sequence of iterates of some generalized quasi-geometric mean-type mapping, and the form of all continuous functions which are invariant with respect to this mapping are given. The equality of two considered operations is also discussed. [less ▲]

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Peer Reviewed
See detailThe re-constitutionalisation of the EMU after the economic crisis
Zaccaroni, Giovanni UL

E-print/Working paper (2018)

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See detailAsset Pricing Implications of Good Governance
Lehnert, Thorsten UL

E-print/Working paper (2018)

Some of the world’s poorest countries have demonstrated that political leadership and practical policies make a difference. Good governance could help to strengthen accountability, enhance participation ... [more ▼]

Some of the world’s poorest countries have demonstrated that political leadership and practical policies make a difference. Good governance could help to strengthen accountability, enhance participation and break down inequalities. Furthermore, a country’s quality of government has a positive effect on the development of its financial market and equity returns. In particular, it lowers equity volatility and, therefore, the costs of equity financing, which further helps to reduce inequalities. While price jumps are prevalent in stock markets all over the world, previous literature provides little guidance about the international nature of jumps and its relationship with country characteristics. Jumps are found to be far less systematic than the smooth (non-jump) component of country price indexes. Hence, if jumps are more idiosyncratic, governance should primarily affect the jump risk component of stock market volatility. This is good news for international investors, because diversification provides insurance against jumps. Relying on an equilibrium asset-pricing model in an economy under jump diffusion, I decompose the moments of the returns of international stock markets into a diffusive (systematic) risk and a (idiosyncratic) jump risk part. Using stock market data for a balanced panel of 52 countries, my results suggest that risk governance is an important determinant of (idiosyncratic) jump risk. Stock markets in poorly governed countries are characterized by higher volatility and more negative return asymmetry, primarily driven by the higher jump risk. Among the different governance indicators analyzed, the regulatory quality, the government effectiveness and the control of corruption appear to be most important. Results are robust to the inclusion of various controls for other country- or market-specific characteristics. My results have important policy implications. [less ▲]

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See detailIslamic Banking and Economic Growth: New Evidence
Kchouri, Bilal UL; Lehnert, Thorsten UL

E-print/Working paper (2018)

While extensive work has shown that conventional banking development is generally conducive to economic growth, there are only a limited number of studies that investigate the impact of Islamic banking ... [more ▼]

While extensive work has shown that conventional banking development is generally conducive to economic growth, there are only a limited number of studies that investigate the impact of Islamic banking. Importantly, the literature on conventional banking claims that a reverse causality from economy performance to banking may exists, but existing studies on Islamic banking fail to address this potential endogeneity problem. This paper tackles this problem and explores the relationship between Islamic banking development and economic performance in a sample of 32 developed and developing countries based on data spanning the 2000 to 2016 period. The findings show that, although Islamic banks are considered small relative to the total size of the financial sector, Islamic banking is positively correlated with economic growth even after controlling for financial structure, macroeconomic factors and other variables. The outcome is robust across different econometric specifications like pooling OLS, fixed effects, panel data with over-identified GMM, and dynamic difference GMM. The results are confirmed on two different indicators of Islamic banking and hold for different time periods. [less ▲]

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See detailModel Uncertainty and Pricing Performance in Option Valuation
Bams, Dennis; Blanchard, Gildas; Lehnert, Thorsten UL

E-print/Working paper (2018)

The objective of this paper is to evaluate option pricing model performance at the cross sectional level. For this purpose, we propose a statistical framework, in which we in particular account for the ... [more ▼]

The objective of this paper is to evaluate option pricing model performance at the cross sectional level. For this purpose, we propose a statistical framework, in which we in particular account for the uncertainty associated with the reported pricing performance. Instead of a single figure, we determine an entire probability distribution function for the loss function that is used to measure option pricing model performance. This methodology enables us to visualize the effect of parameter uncertainty on the reported pricing performance. Using a data driven approach, we confirm previous evidence that standard volatility models with clustering and leverage effects are sufficient for the option pricing purpose. In addition, we demonstrate that there is short-term persistence but long-term heterogeneity in cross-sectional option pricing information. This finding has two important implications. First, it justifies the practitioner’s routine to refrain from time series approaches, and instead estimate option pricing models on a cross-section by cross-section basis. Second, the long term heterogeneity in option prices pinpoints the importance of measuring, comparing and testing option pricing model for each cross-section separately. To our knowledge no statistical testing framework has been applied to a single cross-section of option prices before. We propose a methodology that addresses this need. The proposed framework can be applied to a broad set of models and data. In the empirical part of the paper, we show by means of example, an application that uses a discrete time volatility model on S&P 500 European options. [less ▲]

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See detailThe Subsidy to Infrastructure as an Asset Class*
Kräussl, Roman UL; Andonov, Aleksandar; Rauh, Joshua

E-print/Working paper (2018)

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See detailData Filtering Rules in Option Valuation
Bams, Dennis; Blanchard, Gildas; Lehnert, Thorsten UL

E-print/Working paper (2018)

The choice of data filtering rules are, next to model selection and parameter calibration, an important step in an option pricing exercise. We illustrate the implications of data filtering rules, by ... [more ▼]

The choice of data filtering rules are, next to model selection and parameter calibration, an important step in an option pricing exercise. We illustrate the implications of data filtering rules, by investigating three alternative renowned filtering rules in the context of pricing European S&P 500 index options. Different filtering rules result in strongly diverging samples, which carry different information and therefore lead to different parameter estimates. This is illustrated for the Ad Hoc Black-Scholes model. No filtering rule is, in terms of pricing performance, superior on the whole range of options. Instead, each filtering rule is specialized toward better pricing of options types that were included in the calibration sample at the costs of excluded options. Included options are unable to perfectly represent the properties and characteristics of excluded options. In particular, option prices are heterogeneous in the maturity dimension, which is a major driving force underlying the impact of exclusion filters on pricing performance. Additionally, small deviations from the put-call parity strongly affect parameter estimates as well as the accompanying pricing performance. These results emphasize the prominent role of filtering rules as an important implicit choice for an option pricing model calibration. [less ▲]

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See detailMarket Skewness Risk, Risk Aversion and the Cross-Section of Stock Returns
Bams, Dennis; Honarvar, Iman; Lehnert, Thorsten UL

E-print/Working paper (2018)

Previous research suggests that the cross section of stock returns has substantial exposure to risks captured by higher moments of market returns, implied by S&P500 index option prices. However, assuming ... [more ▼]

Previous research suggests that the cross section of stock returns has substantial exposure to risks captured by higher moments of market returns, implied by S&P500 index option prices. However, assuming that risk aversion is time-varying, a risk-based explanation would suggest that the exposure is priced in periods of high risk aversion, while it is not necessarily priced/weaker in periods of low risk aversion. We find that for market skewness and kurtosis, this hypothesis is not supported by the data. We find that each of the higher moment prices of risk is time-varying and has significantly different patterns under different market conditions, proxied by a measure of investors’ relative risk aversion. In particular, in line with our reasoning, our results suggest that only in down-markets (high risk aversion periods), the exposure to the market volatility innovations is priced significantly negative in the cross-section of stocks, while it is not priced in up-markets (low risk aversion periods). In contrast, we find that in down-markets, market skewness and kurtosis are not priced risk factors, while the price of market skewness risk is significantly negative and the price of kurtosis risk is positive in up-markets. However, the previously reported results for skewness and kurtosis are counterintuitive, strictly violate the risk compensation principles and, therefore, do not support a risk-based explanation. The results persist even after controlling for the Fama-French and Carhart factors. [less ▲]

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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 detailTabakkonsum von Schülern in Luxemburg
Kern, Matthias Robert UL; Heinz, Andreas UL; Residori, Caroline UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden Fragen zum Tabakkonsum gestellt. Von den 11-12-Jährigen sind 2 % laut eigenen Angaben Raucher, in der Altersgruppe 17-18 steigt dieser Anteil auf knapp über ein Drittel. Bis ... [more ▼]

In der HBSC-Studie 2014 wurden Fragen zum Tabakkonsum gestellt. Von den 11-12-Jährigen sind 2 % laut eigenen Angaben Raucher, in der Altersgruppe 17-18 steigt dieser Anteil auf knapp über ein Drittel. Bis zum Alter von 14 Jahren ist der Anteil der regelmäßigen Raucher (d.h. sie rauchen mindestens einmal pro Woche) bei Jungen und Mädchen etwa gleich hoch. In der Altersgruppe 17-18 rauchen 32 % der männlichen Jugendlichen regelmäßig, aber nur 23 % der weiblichen Jugendlichen. Im Enseignement secondaire technique ist der Anteil der regelmäßigen Raucher in allen Altersgruppen ungefähr doppelt so hoch wie im Enseignement secondaire. Die Hälfte der Raucher hat mit 14 Jahren oder noch früher mit dem Rauchen angefangen, daher sollte frühzeitig über die Gefahren des Rauchens aufgeklärt werden. [less ▲]

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See detailAlkoholkonsum von Schülern in Luxemburg
Catunda, Carolina UL; van Duin, Claire UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden die Schüler gefragt, ob sie in den vergangenen 30 Tagen Alkohol getrunken haben. Von den 11-12-Jährigen gaben dies 4 % an, in der Altersgruppe 17-18 waren es 68 %. Bis zum ... [more ▼]

In der HBSC-Studie 2014 wurden die Schüler gefragt, ob sie in den vergangenen 30 Tagen Alkohol getrunken haben. Von den 11-12-Jährigen gaben dies 4 % an, in der Altersgruppe 17-18 waren es 68 %. Bis zum Alter von 16 Jahren geben Jungen und Mädchen ähnlich häufig Alkoholkonsum an. In der Altersgruppe 17-18 haben männliche Jugendliche häufiger als weibliche Jugendliche Alkohol getrunken (73 % vs. 63 % in den vergangenen 30 Tagen). Ältere Jugendliche aus wohlhabenden Familien gaben häufiger Alkoholkonsum an als Jugendliche aus Familien mit geringem Wohlstand (74 % vs. 63 %). Zudem konsumieren die 15-18-jährigen Schüler des Enseignement secondaire häufiger Alkohol als die Schüler des Enseignement secondaire technique. Verglichen mit 15-jährigen Schülern aus anderen Ländern geben die luxemburgischen Schüler seltener an, bereits zweimal oder häufiger in ihrem Leben betrunken gewesen zu sein. [less ▲]

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See detailCannabiskonsum von Schülern in Luxemburg
Heinz, Andreas UL; Kern, Matthias Robert UL; Residori, Caroline UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurde nach dem Cannabiskonsum der Schüler gefragt. 38 % der 17-18-Jährigen haben laut eigenen Angaben mindestens einmal in ihrem Leben Cannabis probiert, in den vergangenen 30 ... [more ▼]

In der HBSC-Studie 2014 wurde nach dem Cannabiskonsum der Schüler gefragt. 38 % der 17-18-Jährigen haben laut eigenen Angaben mindestens einmal in ihrem Leben Cannabis probiert, in den vergangenen 30 Tagen haben in dieser Altersgruppe 15 % Cannabis konsumiert. Der „Probierkonsum“ ist somit deutlich weiter verbreitet als der regelmäßige Konsum. Je älter die Schüler sind, desto höher ist der Anteil der Cannabiskonsumenten, wobei der Anstieg bei den Jungen größer ist als bei den Mädchen. Von den 17-18-Jährigen haben 20 % der Jungen in den vergangenen 30 Tagen Cannabis genommen, aber nur 11 % der Mädchen. Die Häufigkeit des Konsums unterscheidet sich kaum je nach Wohlstand der Familie oder zwischen dem Enseignement secondaire und dem Enseignement secondaire technique. Ein Viertel der Konsumenten hat bis zum Alter von rund 14 Jahren mit dem Konsum angefangen, daher sollte die Prävention frühzeitig einsetzen. [less ▲]

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See detail"Was hältst du zurzeit von der Schule?"
van Duin, Claire UL; Heinz, Andreas UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

Die Schule ist ein wichtiger Ort der Sozialisation, an dem die Schüler viel Zeit verbringen. Positive Erfahrungen mit der Schule können die soziale und gesundheitliche Entwicklung der Schüler fördern ... [more ▼]

Die Schule ist ein wichtiger Ort der Sozialisation, an dem die Schüler viel Zeit verbringen. Positive Erfahrungen mit der Schule können die soziale und gesundheitliche Entwicklung der Schüler fördern, negative Erfahrungen können die Entwicklung beeinträchtigen. Daher wurde in der HBSC-Studie 2014 gefragt, wie sehr die Schüler ihre Schule mögen. Von den 11-12-Jährigen mögen 30 % die Schule sehr, weitere 52 % mögen sie einigermaßen. In der Gruppe der 15-16-Jährigen mögen 11 % die Schule sehr und 15 % mögen sie überhaupt nicht. Dementsprechend mögen Schüler des Fondamental ihre Schule eher als Schüler an Sekundarschulen. Zwischen den Schultypen Secondaire, Secondaire technique und Modulaire gibt es hingegen kaum Unterschiede. Je mehr sich Schüler durch die Schularbeit gestresst fühlen, desto eher mögen sie die Schule nicht. Sie mögen sie auch dann eher nicht, wenn sie vermuten, dass ihre Lehrer sie für leistungsschwach halten. Je weniger die Schüler ihre Schule mögen, desto mehr Gesundheitsbeschwerden berichten sie. [less ▲]

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See detailFrühstückgewohnheiten
Residori, Caroline UL; van Duin, Claire UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden die Schüler gefragt, ob sie an allen Schultagen frühstücken. Tägliches Frühstücken nimmt mit dem Alter ab: Während im Alter von 11-12 rund zwei Drittel der Schüler täglich ... [more ▼]

In der HBSC-Studie 2014 wurden die Schüler gefragt, ob sie an allen Schultagen frühstücken. Tägliches Frühstücken nimmt mit dem Alter ab: Während im Alter von 11-12 rund zwei Drittel der Schüler täglich frühstücken, sind es weniger als die Hälfte der Schüler im Alter von 17-18. Im Alter von 11-16 ist tägliches Frühstücken bei Jungen häufiger verbreitet als bei Mädchen, in der Altersgruppe 17-18 gibt es keine Unterschiede. Die befragten Schüler frühstücken umso eher täglich, je höher der Wohlstand der Familie ist, in der sie aufwachsen. Tägliches Frühstücken ist bei Schülern im Fondamental häufiger verbreitet als bei Schülern an Sekundarschulen. Innerhalb der Sekundarschulen ist tägliches Frühstücken am weitesten verbreitet im Enseignement secondaire und am seltensten im Modulaire. [less ▲]

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See detailGeschlechtsverkehr und Verhütung
van Duin, Claire UL; Heinz, Andreas UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie 2014 wurden den Schülern von Sekundarschulen Fragen zu Sexualität und Verhütung gestellt. Von den männlichen Jugendlichen im Alter von 15 Jahren gaben 27 % an, schon Geschlechtsverkehr ... [more ▼]

In der HBSC-Studie 2014 wurden den Schülern von Sekundarschulen Fragen zu Sexualität und Verhütung gestellt. Von den männlichen Jugendlichen im Alter von 15 Jahren gaben 27 % an, schon Geschlechtsverkehr gehabt zu haben, bei den weiblichen Jugendlichen liegt der Anteil mit 22 % etwas darunter. Von den 18-Jährigen gaben jeweils rund zwei Drittel an, schon mit jemandem geschlafen zu haben. Schüler des Enseignement secondaire technique geben häufiger als ihre Altersgenossen im Enseignement secondaire an, schon Geschlechtsverkehr gehabt zu haben. Bei ihrem letzten Geschlechtsverkehr haben 68 % mit Kondomen verhütet und 55 % mit der Pille. Jungen wussten häufiger als die Mädchen nicht, welche Verhütungsmittel sie genutzt haben. Dies deutet darauf hin, dass Jungen in Verhütungsfragen sorgloser sind und ein Teil von ihnen Verhütung als Frauensache ansieht. Rund 3 % der sexuell aktiven Schüler gaben ein riskantes Verhütungsverhalten an: Sie haben beim letzten Geschlechtsverkehr mittels Koitus interruptus verhütet und sie haben auf andere Methoden verzichtet oder sie wussten nicht, ob der Partner bzw. die Partnerin zusätzlich eine sichere Methode einsetzt. [less ▲]

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See detailSchulischer Stress
van Duin, Claire UL; Heinz, Andreas UL; Kern, Matthias Robert UL et al

E-print/Working paper (2018)

In der HBSC-Studie wurde den Schülern die Frage gestellt: „Fühlst du dich durch die Schularbeit gestresst?“ Insgesamt antworteten 21 % „überhaupt nicht“, 44 % „ein bisschen“, 19 % „einigermaßen“ und 17 ... [more ▼]

In der HBSC-Studie wurde den Schülern die Frage gestellt: „Fühlst du dich durch die Schularbeit gestresst?“ Insgesamt antworteten 21 % „überhaupt nicht“, 44 % „ein bisschen“, 19 % „einigermaßen“ und 17 % „sehr“. Je älter die Schüler sind, desto häufiger geben sie an, unter Schulstress zu leiden. Unter den älteren Schülern sind Mädchen eher von Schulstress betroffen als Jungen. Am häufigsten fühlen sich Schüler des Enseignement secondaire von der Schularbeit gestresst, am seltensten Schüler des Fondamentals, Schüler des Secondaire technique liegen dazwischen. Schüler, die davon ausgehen, dass ihre Lehrer sie für überdurchschnittlich leistungsfähig halten, geben seltener Schulstress an als Schüler, die annehmen, dass ihre Lehrer sie für durchschnittlich oder unterdurchschnittlich leistungsfähig halten. Schüler, die einen stärkeren Schulstress angeben, geben auch an, unter mehr Gesundheitsbeschwerden zu leiden (Kopf-, Bauch- und Rückenschmerzen, Traurigkeit, Gereiztheit, Nervosität, Einschlafschwierigkeiten und Schwindel). [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 detailSignaling or Marketing? The Role of Discount Control Mechanisms
Kräussl, Roman UL; Polletc, Joshua; Stefanova, Denitsa UL

E-print/Working paper (2018)

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See detailThe Performance of Marketplace Lenders:
Kräussl, Roman UL; Kräussl, Zsofia UL; Pollet, Joshua et al

E-print/Working paper (2018)

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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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Peer Reviewed
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 detailLes problèmes de santé des élèves luxembourgeois
Heinz, Andreas UL; Kern, Matthias Robert UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

Dans le cadre de l’enquête HBSC 2014, réalisée dans plusieurs pays de l’Union européenne, les élèves interrogés devaient indiquer la fréquence à laquelle ils souffraient des huit problèmes de santé ... [more ▼]

Dans le cadre de l’enquête HBSC 2014, réalisée dans plusieurs pays de l’Union européenne, les élèves interrogés devaient indiquer la fréquence à laquelle ils souffraient des huit problèmes de santé suivants : maux de tête ou de dos, douleurs abdominales, tristesse, irritabilité, nervosité, difficultés à s’endormir ou vertiges. Le résultat démontre que 41 % des élèves affirmaient avoir plusieurs fois par semaine voire quotidiennement au moins deux des huit problèmes précités. Les filles souffrent plus fréquemment de problèmes de santé que les garçons, ainsi que les élèves plus âgés comparativement aux plus jeunes. En outre, des enfants issus de familles avec un niveau socio-économique faible ont plus souvent des problèmes de santé que les enfants des familles ayant un niveau socio-économique élevé. Enfin, les élèves du secondaire technique et du modulaire souffrent plus fréquemment de problèmes de santé que les élèves de l’enseignement fondamental et du secondaire. [less ▲]

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See detailLe surpoids chez les élèves au Luxembourg
Kern, Matthias Robert UL; Heinz, Andreas UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

Dans le cadre de l’enquête HBSC 2014, réalisée dans plusieurs pays de l’Union européenne, les élèves étaient interrogés concernant leur taille et leur poids pour permettre de calculer leur indice de masse ... [more ▼]

Dans le cadre de l’enquête HBSC 2014, réalisée dans plusieurs pays de l’Union européenne, les élèves étaient interrogés concernant leur taille et leur poids pour permettre de calculer leur indice de masse corporelle (IMC). Parmi les participants, 13 % sont trop maigres, 72 % ont un poids normal, 13 % sont en surpoids et 3 % sont obèses. En comparant avec les autres pays, il y a relativement peu d’enfants de 11 ans au Luxembourg en surpoids. La proportion des élèves de 15 ans en situation de surpoids se trouve au niveau de la moyenne internationale. Les enfants issus de familles de niveau socio-économique élevé ont un risque plus faible d’être en surpoids que ceux des familles avec un niveau plus bas. Les élèves de l’enseignement fondamental et du secondaire sont moins susceptibles d’être en surpoids que ceux du secondaire technique et du modulaire. [less ▲]

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See detailLa satisfaction de vie des élèves au Luxembourg
Kern, Matthias Robert UL; Heinz, Andreas UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

Dans le cadre de l’enquête HBSC 2014, les élèves devaient indiquer à quel point ils étaient satisfaits de leur vie. La valeur « 0 » signifiait « la plus mauvaise vie possible » et la valeur « 10 » ... [more ▼]

Dans le cadre de l’enquête HBSC 2014, les élèves devaient indiquer à quel point ils étaient satisfaits de leur vie. La valeur « 0 » signifiait « la plus mauvaise vie possible » et la valeur « 10 » signifiait « la meilleur vie possible ». Parmi les participants du Luxembourg, 82 % ont indiqué une valeur de 6 ou plus, ce qui est défini comme étant « un niveau de satisfaction de vie élevé ». Pour 10 % d’entre eux, la satisfaction de vie était cotée avec la valeur moyenne de 5 et les 8 % restants ont indiqué une valeur inférieure à 5. La satisfaction de vie des filles moins âgées est plus élevée que celle des filles plus âgées. Chez les garçons, par contre, la satisfaction de vie reste pratiquement constante de 11 à 18 ans. Les garçons sont plus satisfaits de leur vie que les filles, ainsi que les enfants issus des familles avec un niveau socio-économique élevé, en comparaison avec ceux issus des familles ayant un niveau socio-économique faible. La satisfaction de vie est également liée aux problèmes de santé : les élèves qui indiquent souffrir fréquemment de douleurs, de tristesse, de mauvaise humeur / d’irritabilité, de nervosité, de problèmes à s’endormir ou de vertiges sont moins souvent satisfaits de leur vie. [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 detailRussians in Luxembourg, WWII: Поиски старого друга
Ganschow, Inna UL

E-print/Working paper (2018)

Спустя семьдесят лет после окончания Второй мировой войны бывший люксембургский военнопленный решил найти своего старого русского друга, которого пригнали на принудительные работы в сталелитейной ... [more ▼]

Спустя семьдесят лет после окончания Второй мировой войны бывший люксембургский военнопленный решил найти своего старого русского друга, которого пригнали на принудительные работы в сталелитейной промышленности и сельском хозяйстве Люксембурга наравне с другими 4.000 узниками. Судьбы двух пленных переплелись, как они переплетутся между советскими и люксембургскими поданными в Европе еще не раз ... [less ▲]

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See detailRussians in Luxembourg: Русские в Вильтце - история первых эмигрантов
Ganschow, Inna UL

E-print/Working paper (2018)

Люксембургская русская община ведет свой отсчет с 1927 года – десятой годовщины Февральской, а потом и Октябрьской, революции. Девяносто лет назад прибыли эмигранты, прошедшие Гражданскую войну и ... [more ▼]

Люксембургская русская община ведет свой отсчет с 1927 года – десятой годовщины Февральской, а потом и Октябрьской, революции. Девяносто лет назад прибыли эмигранты, прошедшие Гражданскую войну и Крымскую эвакуацию 1920-го, положившую конец сопротивлению Белого движения на Юге России. Приехали в Люксембург, думая, что ненадолго, а остались... навсегда. [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 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 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)

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See detailReliability and Relevance of Fair Values: Private Equity Investments and Investee Fundamentals
Kräussl, Roman UL; Ferreira, Petrus; R. Landsman, Wayne et al

E-print/Working paper (2018)

Detailed reference viewed: 19 (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 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 detailWhen Time Breaks: The Hiatus of Refugee Status
Van Der Walt, Johan Willem Gous UL

E-print/Working paper (2018)

“In the first place, we don’t like to be called ‘refugees.’ We ourselves call one another ‘newcomers’ or ‘immigrants.’” Already here, in the first sentence of Arendt’s essay “We Refugees,” does the hiatus ... [more ▼]

“In the first place, we don’t like to be called ‘refugees.’ We ourselves call one another ‘newcomers’ or ‘immigrants.’” Already here, in the first sentence of Arendt’s essay “We Refugees,” does the hiatus of refugee status become manifest. A divide already opens up between different habits of reference. Refugees refer to themselves in one way, non-refugees refer to them in another, and so does the projected or desired possibility of one world in which both refugees and non-refugees might find accommodation, split into two very different realities. Consciousness of the split is of course solely that of the refugees, at first. Initially, the hiatus is theirs only. Others – non-refugees – remain soundly oblivious to this fundamental split until such time as it brutally breaks into their world too, for instance, when the corpse of a four-year old child washes up on a beach, and washes up on every doorstep in a succession of media waves. And then the hiatus is suddenly everywhere and no one remains exempted. As the last sentence of Arendt’s essay contends forcefully, the split begins with the refugee status of some, but it ends with the bigger split of a world that begins to falter and fall apart: “The comity of European peoples went to pieces when, and because, it allowed its weakest member to be excluded and persecuted.” The comity of European peoples show all signs of going to pieces again today. When the comity of peoples goes to pieces, it is not only common space that cracks up, but also common time, the common time that warrants common space according to Kant’s Schematismuslehre. It is ultimately this breaking of time – the hiatus of time – that Arendt thematises elsewhere with reference to “the desolate aimless wanderings of Israeli tribes in the wilderness and the dangers which befell Aeneas before he reached the Italian shore.” “[T]his hiatus,” she continues, obviously creeps into all time speculations which deviate from the currently accepted notion of time as a continuous flow.” (Arendt On Revolution, 205). This text is also a supplementary discussion of my reviews of two recent monographs on Arendt. See: RECENT ARENDT SCHOLARSHIP: Review of The Wandering Thought of Hannah Arendt by Hans Jörg Sigwart, Palgrave MacMillan, 2016, ISBN: 978-1-137-48214-3, 147 pages (abbreviated as WT below), and Rightlessness in an Age of Rights. Hannah Arendt and the Contemporary Struggles of Migrants by Ayten Gündoğdu, New York: Oxford University Press: 2015, 298 pages, forthcoming in Constellations. [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 ▲]

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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 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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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 ▲]

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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 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)

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

E-print/Working paper (2018)

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See detailThe Credit Structure Database
Leon, Florian UL

E-print/Working paper (2018)

We describe a new publicly available dataset on credit structure across the world over the period 1995-2014. The database contains two modules. The first part reports the structure of bank loan by types ... [more ▼]

We describe a new publicly available dataset on credit structure across the world over the period 1995-2014. The database contains two modules. The first part reports the structure of bank loan by types of borrowers (households vs. firms). Data are available for 143 countries. Household credit is breakdown between mortgage loans and other household loans (credit cards, car loans, student loans, etc.). Firm credit is decomposed into six sectors (agriculture, industry, construction, transport, trade and other services). The second module contains credit by maturity for 85 countries. Short-term credit is defined as loans with a maturity of one year or less and long-term credit as loans whose maturity exceeds one year. Database is freely available and downlable in Excel and Stata format at the following link: https://sites.google.com/site/florianleon/research/data [less ▲]

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See detailRisk and Refugee Migration
Joxhe, Majlinda UL; Bocqueho, Geraldine; Helstroffer, Jenny et al

E-print/Working paper (2018)

This paper uses the experimental setup of Tanaka et al. (2010) to measure refugees’ risk preferences. A sample of 206 asylum seekers was interviewed in 2017-18 in Luxembourg. Contrary to studies which ... [more ▼]

This paper uses the experimental setup of Tanaka et al. (2010) to measure refugees’ risk preferences. A sample of 206 asylum seekers was interviewed in 2017-18 in Luxembourg. Contrary to studies which focus on risk aversion in general, we analyze its components using a cumulative prospect theory (CPT) framework. We show that refugees exhibit particularly low levels of risk aversion compared to other populations and that CPT provides a better fit for modelling risk attitudes. Moreover, we include randomised temporary treatments provoking emotions and find a small significant impact on probability distortion. Robustness of the Tanaka et al. (2010) experimental framework is confirmed by including treatments regarding the embedding effect. Finally, we propose a theoretical model of refugee migration that integrates the insights from our experimental outcomes regarding the functional form of refugees’ decision under risk and the estimated parameter values. The model is then simulated using the data from our study. [less ▲]

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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)

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See detailLong-term finance and entrepreneurship
Leon, Florian UL

E-print/Working paper (2018)

This paper investigates whether long-term finance affects the firm entry across the world. We construct a new database on short-term and long-term credit provided by commercial banks to the private sector ... [more ▼]

This paper investigates whether long-term finance affects the firm entry across the world. We construct a new database on short-term and long-term credit provided by commercial banks to the private sector in 85 countries over the period 1995-2014. We then analyze whether differences in entrepreneurship are correlated with the provision of short-term and long-term bank credit. Data on entrepreneurship are extracted from two frequently used databases: the Global Entrepreneurship Monitoring dataset and Entrepreneurship Database, each of which captures different aspects of firm creation. Econometric results indicate that long-term credit does not stimulate the firm entry. On the contrary, we find that short-term credit exerts a positive impact at each stage of firm creation from activity birth to registration. Our findings are robust to a battery of sensitivity tests, including additional control variables, alternative dependent variables, alternative sample, and changes in econometric specification. Our findings suggest that better provision of short-term credit allows entrepreneurs to apply for a formal loan instead of relying exclusively on informal loans or internal funds, contrary to long-term loans [less ▲]

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Peer Reviewed
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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