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See detailLe brassage dans la Grande Région SaarLorLux
Wöltering, Florian; de Assis Mendonça, Juliano; Helfer, Malte UL et al

E-print/Working paper (2020)

In the Greater Region SaarLorLux, which consists of Lorraine, Luxembourg, Rhineland-Palatinate, Saarland and Wallonia, the beginnings of beer date back to the Roman occupation. At first, beer was brewed ... [more ▼]

In the Greater Region SaarLorLux, which consists of Lorraine, Luxembourg, Rhineland-Palatinate, Saarland and Wallonia, the beginnings of beer date back to the Roman occupation. At first, beer was brewed mainly in monasteries. The oldest evidence of a monastic brewery is found in Lorraine, dating from 771 BC, and in Luxembourg only from around 1300. In both regions, religious institutions were the main type of brewery until the industrialization. The first evidence of a municipal brewery dates back to the 12th century; in the beginning, these breweries did not compete with the monasteries. In Wallonia, too, monastic breweries developed until the French occupation, and hence secularisation, brought the business to a halt from 1794. Today, most of the remaining breweries in the Greater Region are part of international groups. There are still a few independent breweries, such as in Rhineland-Palatinate and Saarland, where one of Germany's largest brewing groups, the Karlsberg Group, dominates the industry. In addition to these national companies, since the 1980s, microbreweries have begun to emerge with an exclusively local scope. They ensure that local brewing techniques are not lost. [less ▲]

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See detailThe Supply of Hours Worked and Endogenous Growth Cycles
Irmen, Andreas UL; Iong, Ka-Kit UL

E-print/Working paper (2020)

We show that declining hours of work per worker in conjunction with a growing work force may give rise to growth cycles. This is accomplished in an overlapping generations model where individuals are ... [more ▼]

We show that declining hours of work per worker in conjunction with a growing work force may give rise to growth cycles. This is accomplished in an overlapping generations model where individuals are endowed with Boppart-Krusell preferences (Boppart and Krusell (2020)), i. e., the wage elasticity of their supply of hours worked is negative. On the supply side, economic growth is due to the expansion of consumption-good varieties through endogenous research. We show that a sufficiently negative equilibrium elasticity of the individual supply of hours worked to an expansion in the set of consumption-good varieties opens up the possibility of growth cycles where the economy fluctuates between two regimes, one with and the other without an active research sector. We identify period-2 and period-3 cycles, conclude with Li and Yorke (1975) that cycles of any periodicity exists, and generalize our findings to period-n cycles. We show that the possibility of cycles occurs under empirically plausible conditions. Throughout, we emphasize that the economics of cycles is linked to the intergenerational trade of shares and their pricing in the asset market. [less ▲]

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See detailEnquête transfrontalière sur le vécu de la littérature au lycée
Raus, Tonia UL; Promonet, Aurore

E-print/Working paper (2020)

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See detailOn the structure of symmetric $n$-ary bands
Devillet, Jimmy UL; Mathonet, Pierre

E-print/Working paper (2020)

We study the class of symmetric $n$-ary bands. These are $n$-ary semigroups $(X,F)$ such that $F$ is invariant under the action of permutations and idempotent, i.e., satisfies $F(x,\ldots,x)=x$ for all $x ... [more ▼]

We study the class of symmetric $n$-ary bands. These are $n$-ary semigroups $(X,F)$ such that $F$ is invariant under the action of permutations and idempotent, i.e., satisfies $F(x,\ldots,x)=x$ for all $x\in X$. We first provide a structure theorem for these symmetric $n$-ary bands that extends the classical (strong) semilattice decomposition of certain classes of bands. We introduce the concept of strong $n$-ary semilattice of $n$-ary semigroups and we show that the symmetric $n$-ary bands are exactly the strong $n$-ary semilattices of $n$-ary extensions of Abelian groups whose exponents divide $n-1$. Finally, we use the structure theorem to obtain necessary and sufficient conditions for a symmetric $n$-ary band to be reducible to a semigroup. [less ▲]

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See detailNormal approximation for functions of hidden Markov models
Kerchev, George UL

E-print/Working paper (2020)

Detailed reference viewed: 56 (3 UL)
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See detailEstimating the number of infected persons
Baraud, Yannick UL; Nourdin, Ivan UL; Peccati, Giovanni UL

E-print/Working paper (2020)

The aim of this paper is to provide a confidence interval on the number of infected persons by COVID-19 within the population from the number of deaths reported in the hospitals and the mortality rate ... [more ▼]

The aim of this paper is to provide a confidence interval on the number of infected persons by COVID-19 within the population from the number of deaths reported in the hospitals and the mortality rate (that is assumed to be known). [less ▲]

Detailed reference viewed: 253 (31 UL)
See detailQuantitative two-scale stabilization on the Poisson space
Lachièze-Rey, Raphaël; Peccati, Giovanni UL; Yang, Xiaochuan

E-print/Working paper (2020)

Detailed reference viewed: 57 (5 UL)
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See detailQuality of Work – Project. Forschungsbericht zur Erhebungswelle 2020
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2020)

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2020 zum achten Mal durchgeführt. Ziel des ... [more ▼]

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2020 zum achten Mal durchgeführt. Ziel des Surveys ist es, die erlebte Arbeitssituation und -qualität luxemburgischer Arbeitnehmer zu erfassen. Der vorliegende Bericht dokumentiert die psychometrische Testung der Güte des aktuellen Erhebungsinstruments. In einem ersten Schritt erfolgt eine Beschreibung der Befragungsumstände sowie eine demographische Beschreibung der Stichprobe. Da die Erhebung 2020 als Mixed-Mode-Design – telefonische als auch Online-Befragung – durchgeführt wurde, wird auch analysiert, ob Stichprobenunterschiede zwischen den beiden Erhebungsmodi auftreten. Außerdem wird geklärt, ob es hinsichtlich demographischer Eigenschaften der Befragten, hinsichtlich der QoW-Skalen oder hinsichtlich verschiedener Well-Being-Maße zu systematischen Ausfällen seit der letzten Welle gekommen ist. Dann erfolgt eine Prüfung der Items der QoW-, der QoE- und der Well-Being-Skalen (fehlende Werte, verteilungsbeschreibender Maßzahlen, Balkendiagramme). In einem nächsten Schritt werden die Skalen mittels verschiedener Reliabilitätsstatistiken (Cronbach’s Alpha, Korrelationsanalysen der Items) sowie Koeffizienten zur Beschreibung der Skalenverteilung überprüft. Außerdem werden die Zusammenhänge der Skalen mittels Korrelationsanalysen überprüft. Im Anschluss daran wird die unterstellte Faktorenstruktur mittels konfirmatorischer Faktoren-analysen getestet. Die QoW- und QoE-Skalen werden außerdem auf verschiedene Well-Being-Skalen regressiert, um deren Relevanz für den QoW-Index zu prüfen. Ebenso werden einige Längsschnitt-Regressionsanalysen durchgeführt, um zu überprüfen ob einige Arbeits-bedingungen längerfristige Effekte auf das Well-Being der Arbeitnehmer aufweisen. Die QoW-Befragung 2020 hat außerdem das Schwerpunktthema „Arbeitsbedingungen in der Corona-Krise“ behandelt. Die Güte der Konstrukte zu diesem Thema wird ebenfalls geprüft. Im Anschluss werden dann Zusammenhänge mit den QoW-, QoE- und Well-Being-Skalen berechnet. Abschließend wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Empfehlungen bezüglich zukünftiger Befragungen gegeben. [less ▲]

Detailed reference viewed: 68 (6 UL)
See detailChallenging the Olympic Charter at the Swiss OECD National Contact Point
Baglayan, Basak UL

E-print/Working paper (2020)

Detailed reference viewed: 154 (0 UL)
See detailThe Structure of Behavioral Data
Defossez, Aurélien; Ansarinia, Morteza UL; Clocher, Brice UL et al

E-print/Working paper (2020)

For more than a century, scientists have been collecting behavioral data--an increasing fraction of which is now being publicly shared so other researchers can reuse them to replicate, integrate or extend ... [more ▼]

For more than a century, scientists have been collecting behavioral data--an increasing fraction of which is now being publicly shared so other researchers can reuse them to replicate, integrate or extend past results. Although behavioral data is fundamental to many scientific fields, there is currently no widely adopted standard for formatting, naming, organizing, describing or sharing such data. This lack of standardization is a major bottleneck for scientific progress. Not only does it prevent the effective reuse of data, it also affects how behavioral data in general are processed, as non-standard data calls for custom-made data analysis code and prevents the development of efficient tools. To address this problem, we develop the Behaverse Data Model (BDM), a standard for structuring behavioral data. Here we focus on major concepts in behavioral data, leaving further details and developments to the project's website (https://behaverse.github.io/data-model/). [less ▲]

Detailed reference viewed: 81 (7 UL)
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See detailL'offre transfrontalière en commerce de détail dans la Grande Région SaarLorLux
Devillet, Guénaël; Vazquez Parras, Juan; Jaspard, Mathieu et al

E-print/Working paper (2020)

The study examines the commercial agglomerations in the inner border regions of the Greater SaarLor-Lux Region on the basis of our own surveys conducted between 2010 and 2012. It quantifies and typifies ... [more ▼]

The study examines the commercial agglomerations in the inner border regions of the Greater SaarLor-Lux Region on the basis of our own surveys conducted between 2010 and 2012. It quantifies and typifies the commercial offer according to the size and composition of shopping centres. The territory covered is made up of the Grand Duchy of Luxembourg and the Belgian, German and French conurbations within a 20-minute drive from the Luxembourg border. This isochrone includes the following cities and their conurbations: Trier and Bitburg in Rhineland-Palatinate, Saarbrücken in Saarland, Metz, Thionville and Longwy in Lorraine as well as Arlon and Bastogne in Wallonia. Only one nodule is located beyond this zone: the Fashion Outlet Zweibrücken in Zweibrucken. It appears in the database because of its wide reach and its ability to recruit customers as far away as Luxembourg. [less ▲]

Detailed reference viewed: 22 (0 UL)
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See detailLa construction d'églises pendant le 20e siècle dans la Grande Région SaarLorLux
Schelbert, Georg; Brakensiek, Stephan; Pauly, Michel UL et al

E-print/Working paper (2020)

In the Greater Region SaarLorLux, it is estimated that around 1,000 new churches were built or old ones completely renovated during the 20th century. Strong population growth due to industrialisation, the ... [more ▼]

In the Greater Region SaarLorLux, it is estimated that around 1,000 new churches were built or old ones completely renovated during the 20th century. Strong population growth due to industrialisation, the destruction caused by the two wars and the resulting displacement of people also had an impact on church building. Developments within the Church itself also play a role in the architecture, especially the debate on the liturgy which began at the beginning of the 20th century and ended with a reform at the Second Vatican Council, and which had a greater or lesser influence in the different regions. [less ▲]

Detailed reference viewed: 56 (0 UL)
See detailTransport inequalities for random point measures
Herry, Ronan; Gozlan, Nathael; Peccati, Giovanni UL

E-print/Working paper (2020)

Detailed reference viewed: 33 (1 UL)
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See detailQuality of Work – Project. Forschungsbericht zur Erhebungswelle 2019
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2020)

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2019 zum siebten Mal durchgeführt. Ziel des ... [more ▼]

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

Detailed reference viewed: 68 (2 UL)
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See detailPoverty in Russia: the Role of the Marital Status and Gender
Zanaj, Skerdilajda UL

E-print/Working paper (2020)

Detailed reference viewed: 56 (4 UL)
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See detailThe signature method : a new tool enhancing time series clustering
Clausel, Marianne; Lejay, Antoine; Terraza, Virginie UL

E-print/Working paper (2020)

Detailed reference viewed: 68 (3 UL)
See detailMedia use, attention, mental health and academic performance among 8 to 12 year old children
Cardoso-Leite, Pedro UL; Buchard, Albert; Tissieres, Isabel et al

E-print/Working paper (2020)

Detailed reference viewed: 58 (4 UL)
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See detailRadical entanglement for elliptic curves
Tronto, Sebastiano UL

E-print/Working paper (2020)

Let G be a commutative connected algebraic group over a number field K, let A be a finitely generated and torsion-free subgroup of G(K) of rank r>0 and, for n>1, let K(n^{−1}A) be the smallest extension ... [more ▼]

Let G be a commutative connected algebraic group over a number field K, let A be a finitely generated and torsion-free subgroup of G(K) of rank r>0 and, for n>1, let K(n^{−1}A) be the smallest extension of K inside an algebraic closure K¯ over which all the points P∈G(K¯) such that nP∈A are defined. We denote by s the unique non-negative integer such that G(K¯)[n]≅(Z/nZ)s for all n≥1. We prove that, under certain conditions, the ratio between nrs and the degree [K(n^{−1}A):K(G[n])] is bounded independently of n>1 by a constant that depends only on the ℓ-adic Galois representations associated with G and on some arithmetic properties of A as a subgroup of G(K) modulo torsion. In particular we extend the main theorems of [13] about elliptic curves to the case of arbitrary rank [less ▲]

Detailed reference viewed: 35 (0 UL)
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See detailSupersingular Isogeny-Based Designated Verifier Blind Signature
Sahu, Rajeev Anand UL; Gini, Agnese UL; Pal, Ankan

E-print/Working paper (2019)

Detailed reference viewed: 56 (5 UL)
See detailCultivation and characterization of human midbrain organoids in sensor integrated microfluidic chips
Spitz, Sarah; Zanetti, Cristian; Bolognin, Silvia UL et al

E-print/Working paper (2019)

Detailed reference viewed: 84 (2 UL)
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See detailProfit taxation and royalties: evidence from gold mines in Sub-Saharan Africa
Bertinelli, Luisito UL; Bourgain, Arnaud UL; Zanaj, Skerdilajda UL

E-print/Working paper (2019)

In this paper, we analyze theoretically and empirically the effects of tax changes on firms’ profits in extractive industries. In the theoretical part, we assume a country that levies a profit tax and a ... [more ▼]

In this paper, we analyze theoretically and empirically the effects of tax changes on firms’ profits in extractive industries. In the theoretical part, we assume a country that levies a profit tax and a royalty on the profits of extractive firms to maximize its tax revenues. The mining companies may reduce their taxable income by cost manipulation. By analyzing the optimal choice of the government and of the firms, we first establish the optimal tax policy and then we investigate the impact of the optimal fiscal policy on firms’ profits. In the empirical part of the paper, we estimate the effect of the profit tax and royalty on the extracting firms’ profit in African countries during the period spanning from 2007 to 2018. We use the Mining Intelligence database to constitute a panel of annual individual data from a database of 363 gold mines located in 21 Sub-Saharan countries. We obtain an inverse relationship between the tax rate change of the two tax instruments and the profit of the firms. [less ▲]

Detailed reference viewed: 83 (3 UL)
See detailA Directive to protect whistle-blowers
Kafteranis, Dimitrios UL

E-print/Working paper (2019)

Detailed reference viewed: 55 (2 UL)
See detailA note on a quantization via the Ran space
Kalugin, Alexey UL

E-print/Working paper (2019)

Detailed reference viewed: 29 (2 UL)
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See detailParliamentary Administrations in EU Politics: The Sources and Impact of Diversity
Högenauer, Anna-Lena UL

E-print/Working paper (2019)

National parliaments tend to delegate a range of tasks related to EU affairs scrutiny to their administrations. However, there is considerable variation in the extent to which national parliaments invest ... [more ▼]

National parliaments tend to delegate a range of tasks related to EU affairs scrutiny to their administrations. However, there is considerable variation in the extent to which national parliaments invest in EU affairs staff. This raises two questions: what is the source of this diversity, and what is its impact on the EU affairs scrutiny of national parliaments? This paper argues that greater investments in EU affairs staff are associated with public Euroscepticism, large parliaments and parliaments with strong scrutiny powers. A large EU staff is, in turn, associated with parliaments that are relatively active in EU affairs scrutiny. This is particularly true for the 15 EU member states that joined before 2004. [less ▲]

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See detailL'espace sportif européen: circulations, organisations et identité européenne
Moreau, Sebastien UL; Sbetti, Nicola; Dufraisse, Sylvain et al

E-print/Working paper (2019)

Dès la fin du xixe siècle, l’espace européen est le cadre d’un développement précoce des échanges sportifs et tient un rôle pionnier dans l’organisation internationale des sports. L’homogénéisation des ... [more ▼]

Dès la fin du xixe siècle, l’espace européen est le cadre d’un développement précoce des échanges sportifs et tient un rôle pionnier dans l’organisation internationale des sports. L’homogénéisation des pratiques et la mise en place de compétitions continentales, processus commencé dans l’entre-deux-guerres et qui se renforce après la Deuxième Guerre mondiale, a comme effet la constitution d’un espace sportif européen. Touchant autant les élites que les masses et le produit d’une intense médiatisation, les sports ont un impact qui dépasse largement les stades et permettent aux Européens de se rencontrer et in fine de mieux se connaître. [less ▲]

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See detailThe 2019 European Parliament Elections in Luxembourg in the Context of Past Elections
Högenauer, Anna-Lena UL

E-print/Working paper (2019)

The aim of this article is to analyse the 2019 European election in Luxembourg and to contextualize it by comparing it with past elections. The article presents the party landscape, the electoral campaign ... [more ▼]

The aim of this article is to analyse the 2019 European election in Luxembourg and to contextualize it by comparing it with past elections. The article presents the party landscape, the electoral campaign, the electoral system and the results of the 2019 European election. The results are then analysed in the context of past national and European elections in order to establish whether European elections are second-order elections in Luxembourg, how electoral volatility evolved over time, whether there is a rise in Eurosceptic parties and how the representation of women has evolved since 1979. [less ▲]

Detailed reference viewed: 72 (2 UL)
See detailThe conformal group of a compact simply connected Lorentzian manifold
Melnick, Karin; Pecastaing, Vincent UL

E-print/Working paper (2019)

Detailed reference viewed: 126 (1 UL)
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See detailConstant Gaussian curvature foliations and Schläfli formulas of hyperbolic 3-manifolds
Mazzoli, Filippo UL

E-print/Working paper (2019)

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary ... [more ▼]

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary. First, we show that the Thurston and the Schwarzian parametrizations are the limits of two families of parametrizations of the space of hyperbolic ends, defined by Labourie in 1992 in terms of the geometry of the leaves S_k. We give a new description of the renormalized volume using the constant curvature foliation. We prove a generalization of McMullen's Kleinian reciprocity theorem, which replaces the role of the Schwarzian parametrization with Labourie's parametrizations. Finally, we describe the constant curvature foliation of a hyperbolic end as the integral curve of a time-dependent Hamiltonian vector field on the cotangent space to Teichmüller space, in analogy to the Moncrief flow for constant mean curvature foliations in Lorenzian space-times. [less ▲]

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See detailDeconstructing Blockchains: A Comprehensive Survey on Consensus, Membership and Structure
Natoli, Christopher; Yu, Jiangshan; Gramoli, Vincent et al

E-print/Working paper (2019)

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a ... [more ▼]

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a flurry of proposals addressing variations and/or trying to solve problems stemming from the initial specification. This added considerable complexity to the current blockchain ecosystems, amplified by the absence of detail in many accompanying blockchain whitepapers. Through this paper, we set out to explain blockchains in a simple way, taming that complexity through the deconstruction of the blockchain into three simple, critical components common to all known systems: membership selection, consensus mechanism and structure. We propose an evaluation framework with insight into system models, desired properties and analysis criteria, using the decoupled components as criteria. We use this framework to provide clear and intuitive overviews of the design principles behind the analyzed systems and the properties achieved. We hope our effort will help clarifying the current state of blockchain proposals and provide directions to the analysis of future proposals. [less ▲]

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See detailDer Arbeitsmarkt der Sozialen Arbeit 2018 = Le marché de l'emploi du secteur social en 2018
Flammang, Manou Laure UL; Böwen, Petra UL

E-print/Working paper (2019)

This newsletter describes the job market in the social work sector in Luxembourg in 2018. The data are derived from an ongoing research project by the "PraxisBüro" of the University of Luxembourg. The ... [more ▼]

This newsletter describes the job market in the social work sector in Luxembourg in 2018. The data are derived from an ongoing research project by the "PraxisBüro" of the University of Luxembourg. The newsletter presents a selection of statistics concerning for example the most sought after qualification levels, the distribution of practice fields, the distribution of job offers in public, municipal, private and non-governmental organisations and the documented gap between the demand of social workers with a Bachelor diploma and the number of Bachelor diplomas issued in Luxembourg. [less ▲]

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See detailProjective and conformal closed manifolds with a higher-rank lattice action
Pecastaing, Vincent UL

E-print/Working paper (2019)

We prove global results about actions of cocompact lattices in higher-rank simple Lie groups on closed manifolds endowed with either a projective class of connections or a conformal class of pseudo ... [more ▼]

We prove global results about actions of cocompact lattices in higher-rank simple Lie groups on closed manifolds endowed with either a projective class of connections or a conformal class of pseudo-Riemannian metrics of signature (p,q), with min(p,q)>1. In the continuity of a recent article, provided that such a structure is locally equivalent to its model X, the main question treated here is the completeness of the associated (G,X)-structure. The similarities between the model spaces of non-Lorentzian conformal geometry and projective geometry make that lots of arguments are valid for both cases, and we expose the proofs in parallel. The conclusion is that in both cases, when the real-rank is maximal, the manifold is globally equivalent to either the model space X or its double cover. [less ▲]

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See detailAdvocate General Bobek on One of us – Legal Clarity vs Political Debate
Hiry, Jasmin UL

E-print/Working paper (2019)

Detailed reference viewed: 77 (2 UL)
Peer Reviewed
See detailAdvocate General Bobek on One of us – Legal Clarity vs Political Debate
Hiry, Jasmin UL

E-print/Working paper (2019)

Detailed reference viewed: 51 (2 UL)
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See detailLocal Social Interaction and Urban Equilibria
Picard, Pierre M UL; Augeraud-Veron, Emmanuelle; Maruhenda, Francisco

E-print/Working paper (2019)

In this paper we investigate the effect of local interaction in a simple urban economics model. Agents interact with others if and only if their interaction benefit outweights their travel cost and ... [more ▼]

In this paper we investigate the effect of local interaction in a simple urban economics model. Agents interact with others if and only if their interaction benefit outweights their travel cost and therefore meet others only within finite geographic windows. We show that two or more cites may co-exist at the equilibrium provided that they are sufficiently distant. For any interaction surplus function, there exists a unique spatial equilibrium on not too large city supports. The population density within a city is determined by a second order advance-delay differential equation, whose solutions are fully characterized for linear interaction surplus functions. Numerical analyses show that more localized interactions yield flatter population density and land rents over larger extents of the city support. They do not give support to the idea that multiple subcenters can be caused by small and finite geographic windows of interaction. [less ▲]

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See detailNow is (not yet) the Winter of Our Discontent: The Unfulfilled Promise of Economic and Social Rights in the Fight Against Economic Inequality
Lichuma, Caroline Omari UL

E-print/Working paper (2019)

Material inequality or (extreme) economic inequality has been touted as one of the greatest challenges of the twenty-first century. Wealth is “hemorrhaging upwards” rather than “trickling down.” In a ... [more ▼]

Material inequality or (extreme) economic inequality has been touted as one of the greatest challenges of the twenty-first century. Wealth is “hemorrhaging upwards” rather than “trickling down.” In a world where the rich get richer, the poor get poorer, and the inequality gap in income and wealth continues intensifying at an alarming pace, there exists an “inequality explosion” that threatens the very fabric of our global society. While economic inequality and questions of (re)distribution of wealth and income have traditionally been examined within the spheres of development law and political economy, I argue that a human rights based approach that contains economic and social rights (hereinafter, ESRs) at its core is capable of mitigating economic inequality. International human rights norms enjoy a high level of global legitimacy, as evidenced by the fact that the key human rights instruments have been widely accepted in all regions of the world. 169 States have ratified the International Covenant on Economic, Social and Cultural Rights (hereinafter, ICESCR). Underpinned by universally recognized moral values and reinforced by national and international legal obligations, ESRs therefore provide a compelling normative framework through which material inequality can be addressed. [less ▲]

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See detailBorders and the mobility of migrants in France
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This country report investigates the ways in which the border as a site of control interferes with asylum seekers’ and refugees’ mobility trajectories before, upon and after arrival in France. The ... [more ▼]

This country report investigates the ways in which the border as a site of control interferes with asylum seekers’ and refugees’ mobility trajectories before, upon and after arrival in France. The interplay between borders and mobility plays a key role in the Common European Asylum System, the Schengen area and the Dublin regulation, which all have been affected by the 2015 so-called migration crisis. Based on in-depth qualitative interviews with thirteen migrants and ten institutional actors in the city of Metz, the overarching finding indicates that migrants’ movements evolve from geographical trajectories in order to reach a country of destination, to administrative trajectories, in order to become regularised in the host country. Furthermore, while physical borders have interfered with some informants’ migratory journeys, they have done so only by changing their trajectories, and, at times, the initial country of destination. Thus, they did not deter the migrants from reaching a safe country of destination. Once in Metz, the migrants become subject to administrative borders performed by state agents, such as the Préfecture and the French Agency for Immigration and Integration (OFII), as well as by private actors from the employment market. [less ▲]

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See detailBorders and the mobility of migrants in the EU and Turkey
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This comparative report investigates the ways in which the mobility of applicants for international protection, beneficiaries of international protection and irregular migrants intersect with the borders ... [more ▼]

This comparative report investigates the ways in which the mobility of applicants for international protection, beneficiaries of international protection and irregular migrants intersect with the borders encountered during their trajectories before, during and after their arrival in six EU countries (Greece, Hungary, Germany, Luxembourg, France and Spain) and Turkey. After defining the concept of borders, this study contextualises the securitisation of EU external and internal borders, and it provides some background information on the CEAS and the Dublin Regulation, which are central to this research. Moreover, it engages with the legislative framework in place in the field of asylum in the seven countries on which this report draws. Based on qualitative interviews with a total of 96 asylum seekers, refugees and irregular migrants, as well as 94 state and non-state actors and ethnographic observation, the empirical part of the study explored the following aspects: experiences and conceptualisations of borders; mobility patterns and trajectories; the interplay between the Schengen zone and the Dublin system; the shortcomings of CEAS; as well as policies and experiences in the fields of housing and employment. The main finding of this comparative report is that while territorial borders cannot always impede human mobility, they are recreated within countries as administrative borders, which can encourage secondary movements. [less ▲]

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See detailBorders and the mobility of migrants in Luxembourg
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This country report sought to explore the border as a site of control and the ways in which it interferes with migrants’ (asylum seekers, refugees and rejected asylum seekers) trajectories before, upon ... [more ▼]

This country report sought to explore the border as a site of control and the ways in which it interferes with migrants’ (asylum seekers, refugees and rejected asylum seekers) trajectories before, upon and after arrival in Luxembourg. To this end, it explored, through qualitative interviews with a total of 29 state and civil society actors and migrants, as well as ethnographic observation at Findel airport, Luxembourg’s only external border, the multiple conceptualisations and experiences of borders. It has identified that the suppression of internal controls within the Schengen area has been accompanied by a surge of controls within the member states, either at the stage of lodging an asylum claim, or at the street level, where migrants can be stopped and searched by police officers. Furthermore, the data showed that the migrants interviewed not only did they experience bordering practices during their interactions with public actors, but they were also subject to bordering during their interactions with private actors from the housing and employment market. The principal finding of this research with regards to the interplay between borders and the mobility of migrants is that cross-border mobility is commonplace, the migrants’ mobility practices reflecting the movements of the local population. As such, borders do not represent efficient mechanisms of control which can prevent migrants’ mobility trajectories. [less ▲]

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See detailBelgien und Deutschland: eine kleine Beziehungsgeschichte
Brüll, Christoph UL

E-print/Working paper (2019)

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See detailA Lightweight Implementation of NTRUEncrypt for 8-bit AVR Microcontrollers
Cheng, Hao UL; Groszschädl, Johann UL; Roenne, Peter UL et al

E-print/Working paper (2019)

Introduced in 1996, NTRUEncrypt is not only one of the earliest but also one of the most scrutinized lattice-based cryptosystems and a serious contender in NIST’s ongoing Post-Quantum Cryptography (PQC ... [more ▼]

Introduced in 1996, NTRUEncrypt is not only one of the earliest but also one of the most scrutinized lattice-based cryptosystems and a serious contender in NIST’s ongoing Post-Quantum Cryptography (PQC) standardization project. An important criterion for the assessment of candidates is their computational cost in various hardware and software environments. This paper contributes to the evaluation of NTRUEncrypt on the ATmega class of AVR microcontrollers, which belongs to the most popular 8-bit platforms in the embedded domain. More concretely, we present AvrNtru, a carefully-optimized implementation of NTRUEncrypt that we developed from scratch with the goal of achieving high performance and resistance to timing attacks. AvrNtru complies with version 3.3 of the EESS#1 specification and supports recent product-form parameter sets like ees443ep1, ees587ep1, and ees743ep1. A full encryption operation (including mask generation and blinding- polynomial generation) using the ees443ep1 parameters takes 834,272 clock cycles on an ATmega1281 microcontroller; the decryption is slightly more costly and has an execution time of 1,061,683 cycles. When choosing the ees743ep1 parameters to achieve a 256-bit security level, 1,539,829 clock cycles are cost for encryption and 2,103,228 clock cycles for decryption. We achieved these results thanks to a novel hybrid technique for multiplication in truncated polynomial rings where one of the operands is a sparse ternary polynomial in product form. Our hybrid technique is inspired by Gura et al’s hybrid method for multiple-precision integer multiplication (CHES 2004) and takes advantage of the large register file of the AVR architecture to minimize the number of load instructions. A constant-time multiplication in the ring specified by the ees443ep1 parameters requires only 210,827 cycles, which sets a new speed record for the arithmetic component of a lattice-based cryptosystem on an 8-bit microcontroller. [less ▲]

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

E-print/Working paper (2019)

Detailed reference viewed: 110 (4 UL)
See detailMitochondrial morphology provides a mechanism for energy buffering at synapses
Garcia, Guadalupe Clara UL; Bartol, Thomas M.; Phan, Sebastien A. et al

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

Detailed reference viewed: 131 (0 UL)
See detailLes Lorrains actifs à l'étranger, analyse au niveau communal
Pigeron-Piroth, Isabelle UL; Helfer, Malte UL

E-print/Working paper (2019)

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

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

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See detailA Symbol of History
Danescu, Elena UL

E-print/Working paper (2019)

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

Detailed reference viewed: 89 (2 UL)
See detailMonetary Policy Transmission to Consumer Financial Stress and Durable Consumption
Georgarakos, Dimitris; Tatsiramos, Konstantinos UL

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

E-print/Working paper (2019)

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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See detailRank n swapping algebra for Grassmannian
Sun, Zhe UL

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

Detailed reference viewed: 76 (9 UL)
See detailSingle-cell transcriptomics reveals multiple neuronal cell types in human midbrain-specific organoids
Smits, Lisa UL; Magni, Stefano UL; Grzyb, Kamil UL et al

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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See detailFear and Euphoria
Lehnert, Thorsten UL

E-print/Working paper (2019)

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

E-print/Working paper (2019)

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

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

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See detailIntegrating sustainability risks - Implications of the ESMA consultation paper on the integration of sustainability risks and factors
Emrick-Schmitz, Elena Ashley UL; Ammar, Ashraf

E-print/Working paper (2019)

The private equity sector has been increasingly adopting responsible investment practices, with investors being the initial driving force. According to the Global private equity survey conducted by PwC in ... [more ▼]

The private equity sector has been increasingly adopting responsible investment practices, with investors being the initial driving force. According to the Global private equity survey conducted by PwC in 2017, 60% of all private equity firms questioned (111 general partners from 22 countries) stated that they have incorporated ESG (Environmental, Social and Governance) factors within their initial screening process. 44% of them aim to align their sustainability efforts to the UN Sustainable Development Goals. [less ▲]

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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See detailPractical bounds on the error of Bayesian posterior approximations: A nonasymptotic approach
Huggins, Jonathan; Kasprzak, Mikolaj UL; Campbell, Trevor et al

E-print/Working paper (2019)

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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See detailBianchi's additional symmetries
Rahm, Alexander UL

E-print/Working paper (2019)

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See detailKrichever-Novivkov type algebras. A general review and the genus zero case
Schlichenmaier, Martin UL

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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

E-print/Working paper (2019)

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

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

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