References of "First made available on ORBilu"
     in
Bookmark and Share    
Full Text
See detailYolanda von Vianden und das Yolanda-Epos
Sieburg, Heinz UL

E-print/Working paper (in press)

Detailed reference viewed: 74 (4 UL)
Full Text
See detailOn the Cohomological Crepant Resolution Conjecture for the complexified Bianchi orbifolds
Perroni, Fabio; Rahm, Alexander UL

E-print/Working paper (in press)

We give formulae for the Chen--Ruan orbifold cohomology for the orbifolds given by a Bianchi group acting on complex hyperbolic 3-space. The Bianchi groups are the arithmetic groups PSL_2(A), where A is ... [more ▼]

We give formulae for the Chen--Ruan orbifold cohomology for the orbifolds given by a Bianchi group acting on complex hyperbolic 3-space. The Bianchi groups are the arithmetic groups PSL_2(A), where A is the ring of integers in an imaginary quadratic number field. The underlying real orbifolds which help us in our study, given by the action of a Bianchi group on real hyperbolic 3-space (which is a model for its classifying space for proper actions), have applications in physics. We then prove that, for any such orbifold, its Chen-Ruan orbifold cohomology ring is isomorphic to the usual cohomology ring of any crepant resolution of its coarse moduli space. By vanishing of the quantum corrections, we show that this result fits in with Ruan's Cohomological Crepant Resolution Conjecture. [less ▲]

Detailed reference viewed: 65 (1 UL)
Full Text
See detailThe edge-based strain smoothing method for compressible and nearly incompressible non-linear elasticity for solid mechanics
Lee, Chang-Kye; Mihai, L. Angela; Kerfriden, Pierre et al

E-print/Working paper (in press)

Detailed reference viewed: 426 (34 UL)
Full Text
Peer Reviewed
See detailGenuine Bianchi modular forms of higher level, at varying weight and discriminant
Rahm, Alexander UL; Tsaknias, Panagiotis UL

E-print/Working paper (in press)

Bianchi modular forms are automorphic forms over an imaginary quadratic field, associated to a Bianchi group. Even though modern studies of Bianchi modular forms go back to the mid 1960's, most of the ... [more ▼]

Bianchi modular forms are automorphic forms over an imaginary quadratic field, associated to a Bianchi group. Even though modern studies of Bianchi modular forms go back to the mid 1960's, most of the fundamental problems surrounding their theory are still wide open. Only for certain types of Bianchi modular forms, which we will call "generic", it is possible at present to develop dimension formulas: They are (twists of) those forms which arise from elliptic cuspidal modular forms via the Langlands base-change procedure, or arise from a quadratic extension of the imaginary quadratic field via automorphic induction (so-called CM-forms). The remaining, non-"generic" Bianchi modular forms are what we call "genuine", and they are of interest for an extension of the modularity theorem (formerly the Taniyama-Shimura conjecture, crucial in the proof of Femat's Last Theorem) to imaginary quadratic fields. In a preceding paper by Rahm and Sengun, an extreme paucity of "genuine" cuspidal Bianchi modular forms has been reported, but those and other computations and were restricted to level One. In this paper, we are extending the formulas for the "generic" Bianchi modular forms to deeper levels, and we are able to spot the first, rare instances of "genuine" forms at deeper level and heavier weight. [less ▲]

Detailed reference viewed: 131 (15 UL)
Full Text
See detailThe Farrell--Tate and Bredon homology for PSL_4(Z) and other arithmetic groups
Bui, Anh Tuan; Rahm, Alexander UL; Wendt, Matthias

E-print/Working paper (in press)

We provide some new computations of Farrell--Tate and Bredon (co)homology for arithmetic groups. For calculations of Farrell--Tate or Bredon homology, one needs cell complexes where cell stabilizers fix ... [more ▼]

We provide some new computations of Farrell--Tate and Bredon (co)homology for arithmetic groups. For calculations of Farrell--Tate or Bredon homology, one needs cell complexes where cell stabilizers fix their cells pointwise. We provide an algorithm computing an efficient subdivision of a complex to achieve this rigidity property. Applying this algorithm to available cell complexes for PSL_4(Z) and PGL_3(Z[i]) provides computations of Farrell--Tate cohomology for small primes as well as the Bredon homology for the classifying spaces of proper actions with coefficients in the complex representation ring. On the other hand, to check correctness of the computer calculations, we describe the Farrell--Tate cohomology in some rank-one cases, using Brown's complex and a number-theoretic description of the conjugacy classification of cyclic subgroups. [less ▲]

Detailed reference viewed: 87 (10 UL)
Full Text
See detailLe surpoids chez les élèves au Luxembourg
Kern, Matthias Robert UL; Heinz, Andreas UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

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

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

Detailed reference viewed: 28 (3 UL)
Full Text
See detailLes problèmes de santé des élèves luxembourgeois
Heinz, Andreas UL; Kern, Matthias Robert UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

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

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

Detailed reference viewed: 37 (6 UL)
Full Text
See detailLa satisfaction de vie des élèves au Luxembourg
Kern, Matthias Robert UL; Heinz, Andreas UL; Catunda, Carolina UL et al

E-print/Working paper (2018)

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

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

Detailed reference viewed: 32 (5 UL)
Full Text
See detailRussians in Luxembourg, WWII: Поиски старого друга
Ganschow, Inna UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 35 (7 UL)
Full Text
See detailRussians in Luxembourg: Русские в Вильтце - история первых эмигрантов
Ganschow, Inna UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 33 (5 UL)
Full Text
See detailWhen Time Breaks: The Hiatus of Refugee Status
Van Der Walt, Johan Willem Gous UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 85 (11 UL)
Full Text
See detailRisk and Refugee Migration
Joxhe, Majlinda UL; Bocqueho, Geraldine; Helstroffer, Jenny et al

E-print/Working paper (2018)

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

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

Detailed reference viewed: 33 (9 UL)
Full Text
See detailThe Credit Structure Database
Leon, Florian UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 66 (2 UL)
Full Text
See detailExpediting in Two-Echelon Spare Parts Inventory Systems
Drent, Melvin UL; Arts, Joachim UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 128 (22 UL)
Full Text
See detailAttacks and Countermeasures for White-box Designs
Biryukov, Alex UL; Udovenko, Aleksei UL

E-print/Working paper (2018)

In the traditional symmetric cryptography, the adversary has access only to the inputs and outputs of a cryptographic primitive. In the white-box model the adversary is given full access to the ... [more ▼]

In the traditional symmetric cryptography, the adversary has access only to the inputs and outputs of a cryptographic primitive. In the white-box model the adversary is given full access to the implementation. He can use both static and dynamic analysis as well as fault analysis in order to break the cryptosystem, e.g. to extract embedded secret key. Implementations secure in such model have many applications in industry. However, creating such implementations turns out to be a very challenging if not an impossible task. Recently, Bos et al. proposed a generic attack on white-box primitives called differential computation analysis (DCA). This attack applies to most existent white-box implementations both from academia and industry. The attack comes from side-channel cryptanalysis method. The most common method protecting against such side-channel attacks is masking. Therefore, masking can be used in white-box implementations to protect against the DCA attack. In this paper we investigate this possibility and present multiple generic attacks against masked white-box implementations. We use the term “masking” in a very broad sense. As a result, we deduce new constraints that any secure white-box implementation must satisfy. We suggest partial countermeasures against the attacks. Some of our attacks were successfully applied to the WhibOx 2017 challenges. [less ▲]

Detailed reference viewed: 457 (5 UL)
Full Text
See detailDo banks and microfinance institutions compete? Microevidence from Madagascar
Leon, Florian UL; Baraton, Pierrick

E-print/Working paper (2018)

In recent years, both microfinance institutions (MFIs) and banks across the world have been converging towards the financing of small enterprises with high financing needs. This paper scrutinizes whether ... [more ▼]

In recent years, both microfinance institutions (MFIs) and banks across the world have been converging towards the financing of small enterprises with high financing needs. This paper scrutinizes whether banks and MFIs compete each other as a result of recent transformations in both industries. In doing so, we study whether the loan strategy of a microfinance institution is shaped by the local presence of a bank. Specifically, we investigate whether bank proximity influences loan conditions provided by one of the largest microfinance institutions in Madagascar. We employ an original panel dataset of 32,374 loans granted to 14,834 borrowers over the period 2008-2014. We find that the closer a bank is located to a given MFI borrower, the larger the loan obtained and the less collateral required. These results are insensitive to several robustness tests for possible endogeneity of distance, sample selection issue, and alternative specifications. In addition, findings are stronger for larger and more established (older) firms in line with our hypothesis. [less ▲]

Detailed reference viewed: 61 (12 UL)
Full Text
See detailLong-term finance and entrepreneurship
Leon, Florian UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 23 (7 UL)
Full Text
See detailKummer theory for number fields
Perucca, Antonella UL; Sgobba, Pietro

E-print/Working paper (2018)

Detailed reference viewed: 17 (0 UL)
Full Text
See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

E-print/Working paper (2018)

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we ... [more ▼]

The observed negative relationship between market skewness and excess return or the negative price of market skewness risk in the cross-section of stock returns is somewhat counterintuitive when we consider the usual interpretation of e.g. option-implied skewness as an indicator of jump risk or downside risk. One possible explanation for this inconsistency is that there are factors affecting option-implied market skewness other than jump risk in the stock market. In this paper, I find that price pressure associated with “crowded trades” of mutual funds is an important endogenous factor. Given that retail investors are prone to herding, the directional trading of mutual funds is correlated, and their collective actions can generate short-term price pressure on aggregate stock prices. Short sellers systematically exploit these patterns not only in the equity lending market, but also in the options market. In line with this economic channel, I find that firstly, the significant negative relationship between market skewness and returns becomes insignificant, once I control for price pressure. Secondly, the negative relationship is only present for the “bad” downside component of risk-neutral skewness, associated with out-of-the-money put options. For the “good” upside component of risk-neutral skewness, associated with out-of-the-money call options, the relationship is always positive. Thirdly, price pressure affects the skewness-return relationship, which can be clearly distinguished from the impact of flows on the volatility-return relationship in terms of the leverage effect. [less ▲]

Detailed reference viewed: 58 (3 UL)
Full Text
See detailUnderstanding the Babylonian tablet ‘Plimpton 322’ with the decimal system
Perucca, Antonella UL; Stranen, Deborah

E-print/Working paper (2018)

Detailed reference viewed: 21 (0 UL)
Full Text
See detailFunctional analytic issues in Z_2 ^n Geometry
Bruce, Andrew UL; Poncin, Norbert UL

E-print/Working paper (2018)

Detailed reference viewed: 14 (1 UL)
Full Text
See detailMutant Quality Indicators
Papadakis, Mike UL; Titcheu Chekam, Thierry UL; Le Traon, Yves UL

E-print/Working paper (2018)

Detailed reference viewed: 120 (8 UL)
Full Text
See detailBig Moves of Mutual Funds
Lehnert, Thorsten UL

E-print/Working paper (2018)

Detailed reference viewed: 20 (0 UL)
Full Text
See detailGovernance and Price Jumps
Lehnert, Thorsten UL

E-print/Working paper (2018)

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

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

Detailed reference viewed: 21 (0 UL)
Full Text
See detailProducts in the category of Z_2^n manifolds
Bruce, Andrew UL; Poncin, Norbert UL

E-print/Working paper (2018)

Detailed reference viewed: 17 (1 UL)
Full Text
See detailGesundheitsbeschwerden von Schülern in Luxemburg
Heinz, Andreas UL; Kern, Matthias Robert UL; Residori, Caroline UL et al

E-print/Working paper (2017)

Detailed reference viewed: 51 (19 UL)
Full Text
See detailDie allgemeine Lebenszufriedenheit von Schülern in Luxemburg
Kern, Matthias Robert UL; Residori, Caroline UL; Heinz, Andreas UL et al

E-print/Working paper (2017)

Detailed reference viewed: 48 (15 UL)
Full Text
See detailÜbergewicht bei Schülern in Luxemburg
Residori, Caroline UL; Kern, Matthias Robert UL; Heinz, Andreas UL et al

E-print/Working paper (2017)

Detailed reference viewed: 42 (11 UL)
Full Text
See detailWho Trade at Better Prices?
Wolff, Christian UL; Ekkayokkaya, Manapol

E-print/Working paper (2017)

Detailed reference viewed: 18 (0 UL)
Full Text
See detailState of the Art in Lightweight Symmetric Cryptography
Biryukov, Alex UL; Perrin, Léo Paul UL

E-print/Working paper (2017)

Lightweight cryptography has been one of the ``hot topics'' in symmetric cryptography in the recent years. A huge number of lightweight algorithms have been published, standardized and/or used in ... [more ▼]

Lightweight cryptography has been one of the ``hot topics'' in symmetric cryptography in the recent years. A huge number of lightweight algorithms have been published, standardized and/or used in commercial products. In this paper, we discuss the different implementation constraints that a ``lightweight'' algorithm is usually designed to satisfy. We also present an extensive survey of all lightweight symmetric primitives we are aware of. It covers designs from the academic community, from government agencies and proprietary algorithms which were reverse-engineered or leaked. Relevant national (\nist{}...) and international (\textsc{iso/iec}...) standards are listed. We then discuss some trends we identified in the design of lightweight algorithms, namely the designers' preference for \arx{}-based and bitsliced-S-Box-based designs and simple key schedules. Finally, we argue that lightweight cryptography is too large a field and that it should be split into two related but distinct areas: \emph{ultra-lightweight} and \emph{IoT} cryptography. The former deals only with the smallest of devices for which a lower security level may be justified by the very harsh design constraints. The latter corresponds to low-power embedded processors for which the \aes{} and modern hash function are costly but which have to provide a high level security due to their greater connectivity. [less ▲]

Detailed reference viewed: 468 (7 UL)
Full Text
See detailWhat makes Data Science different? A discussion involving Statistics2.0 and Computational Sciences
Ley, Christophe; Bordas, Stéphane UL

E-print/Working paper (2017)

Data Science is today one of the main buzzwords be it in business, industrial or academic settings. Machine learning, experimental design, data-driven modelling are all, undoubtedly, rising disciplines if ... [more ▼]

Data Science is today one of the main buzzwords be it in business, industrial or academic settings. Machine learning, experimental design, data-driven modelling are all, undoubtedly, rising disciplines if one goes by the soaring number of research papers and patents appearing each year. The prospect of becoming a ``Data Scientist'' appeals to many. A discussion panel organised as part of the European Data Science Conference (European Association for Data Science (EuADS)) asked the question: ``What makes Data Science different?'' In this paper we give our own, personal and multi-facetted view on this question, from an engineering and a statistics perspective. In particular, we compare Data Science to Statistics and discuss the connection between Data Science and Computational Science. [less ▲]

Detailed reference viewed: 492 (30 UL)
Full Text
See detailMigration, Labor Tasks and Production Structure in Europe
Joxhe, Majlinda UL; Borelli, Stefania; Giuseppe, De Arcangelis

E-print/Working paper (2017)

This paper assesses the effect of the immigration on the production structure in a selection of European countries in 2001-2009 with a task-based approach. The inflow of immigrants represents an increase ... [more ▼]

This paper assesses the effect of the immigration on the production structure in a selection of European countries in 2001-2009 with a task-based approach. The inflow of immigrants represents an increase in the relative supply of manual-physical (or simple) tasks, hence favoring simple-task intensive sectors. We use a new OECD dataset, PIAAC, to calculate the index of simple-task intensity at the country-industry level. The analysis confirms that the increase in migration stocks caused a positive impact on the value added of sectors that use more intensively simple tasks. These effects are more intense when considering countries as Italy and Spain characterized by a recent, rapid and intense inflow of migrants. Endogeneity issues are discussed and instruments based on a gravity approach are used in estimation. [less ▲]

Detailed reference viewed: 41 (6 UL)
Full Text
Peer Reviewed
See detailReal-time Error Control for Surgical Simulation
Bui, Huu Phuoc UL; Tomar, Satyendra UL; Bordas, Stéphane UL

E-print/Working paper (2017)

Real-time simulations are becoming increasingly common for various applications, from geometric design to medical simulation. Two of the main factors concurrently involved in defining the accuracy of ... [more ▼]

Real-time simulations are becoming increasingly common for various applications, from geometric design to medical simulation. Two of the main factors concurrently involved in defining the accuracy of surgical simulations are: the modeling error and the discretization error. Most work in the area has been looking at the above sources of error as a compounded, lumped, overall error. Little or no work has been done to discriminate between modeling error (e.g. needle-tissue interaction, choice of constitutive models) and discretization error (use of approximation methods like FEM). However, it is impossible to validate the complete surgical simulation approach and, more importantly, to understand the sources of error, without evaluating both the discretization error and the modeling error. Our objective is thus to devise a robust and fast approach to measure the discretization error via a posteriori error estimates, which are then used for local remeshing in surgical simulations. To ensure that the approach can be used in clinical practice, the method should be robust enough to deal, as realistically as possible, with the interaction of surgical tools with the organ, and fast enough for real-time simulations. The approach should also lead to an improved convergence so that an economical mesh is obtained at each time step. The final goal is to achieve optimal convergence and the most economical mesh, which will be studied in our future work. [less ▲]

Detailed reference viewed: 275 (23 UL)
Full Text
See detailWealth accumulation over the life course. The role of disadvantages across the employment history
Ponomarenko, Valentina UL

E-print/Working paper (2017)

In this study wealth is employed as an often neglected but highly stratified well-being measure in sociology. I relate the employment history and especially the accumulating disadvantages like ... [more ▼]

In this study wealth is employed as an often neglected but highly stratified well-being measure in sociology. I relate the employment history and especially the accumulating disadvantages like nonemployment and lower occupations to wealth in old age. In particular, I am interested in determining whether an adverse employment history prevents wealth accumulation and which factors influence wealth accumulation across the life course. I use comparative data from the Survey of Health, Ageing and Retirement and combine it with the retrospective panel SHARELIFE to retrieve information about the complete employment history. The relevance of wealth varies significantly across households and in the wider national context. Hence, a contextual perspective is included to account for the difference in wealth rates and wealth inequality in the European countries. The results show that cumulative nonemployment and employment in lower occupations has significant disadvantages for wealth accumulation in old age. However, large differences for men and women persist. Particularly, the household composition and household factors are decisive in the effectuality of these disadvantages. The relation of life course employment and especially disadvantages to accumulated wealth in old aged is stronger in conservative countries than in other welfare regimes. [less ▲]

Detailed reference viewed: 186 (3 UL)
Full Text
Peer Reviewed
See detailQuantum moment maps and retracts for bounded symmetric domains
Korvers, Stéphane UL

E-print/Working paper (2017)

Detailed reference viewed: 24 (2 UL)
Full Text
See detailHarnack estimates for a heat-type equation under the geometric flow
Li, Yi UL; Zhu, Xiaorui

E-print/Working paper (2017)

Detailed reference viewed: 60 (1 UL)
Full Text
Peer Reviewed
See detailThe Missing Risk Premium in Exchange Rates
Penasse, Julien UL; Magnus, Dahlquist

E-print/Working paper (2017)

Detailed reference viewed: 36 (0 UL)
Full Text
Peer Reviewed
See detailRäumliche Identifikationen und Identifizierungen in Grenzregionen. Das Beispiel der Großregion SaarLorLux
Wille, Christian UL

E-print/Working paper (2017)

In diesem Beitrag wird die Bedeutung von nationalen Grenzen für räumliche Identitäten in Grenzregionen analysiert. Dafür wird ein mehrdimensionales Analysemodell entwickelt und am Beispiel der Großregion ... [more ▼]

In diesem Beitrag wird die Bedeutung von nationalen Grenzen für räumliche Identitäten in Grenzregionen analysiert. Dafür wird ein mehrdimensionales Analysemodell entwickelt und am Beispiel der Großregion SaarLorLux gefragt, wie die Einwohner den Raum repräsentieren und wie sie ihre alltagskulturellen Praktiken räumlich organisieren. Außerdem werden räumliche Projektionen im politischen Diskurs aufgedeckt und rekonstruiert, inwiefern diese eine Grundlage bilden für Identifizierungsprozesse. Der Beitrag zeigt, dass nationale Grenzen in den Identifikations- und Identifizierungsvorgängen der Einwohner der Großregion SaarLorLux trotz grenzüberschreitender Verflechtungen eine wichtige Rolle spielen, aber nicht zwangsläufig als starre Ordnungskategorien. [less ▲]

Detailed reference viewed: 199 (21 UL)
Full Text
See detailOn the Naturalness of Mutants
Jimenez, Matthieu UL; Cordy, Maxime UL; Kintis, Marinos UL et al

E-print/Working paper (2017)

Detailed reference viewed: 58 (5 UL)
Full Text
See detailPolynomial quadratic differentials on the complex plane and light-like polygons in the Einstein Universe
Tamburelli, Andrea UL

E-print/Working paper (2017)

We construct geometrically a homeomorphism between the moduli space of polynomial quadratic differentials on the complex plane and light-like polygons in the 2-dimensional Einstein Universe. As an ... [more ▼]

We construct geometrically a homeomorphism between the moduli space of polynomial quadratic differentials on the complex plane and light-like polygons in the 2-dimensional Einstein Universe. As an application, we find a class of minimal Lagrangian maps between ideal polygons in the hyperbolic plane. [less ▲]

Detailed reference viewed: 52 (2 UL)
Full Text
See detailThe Vanishing of Low-Dimensional Cohomology Groups of the Witt and the Virasoro algebra
Ecker, Jill Marie-Anne UL; Schlichenmaier, Martin UL

E-print/Working paper (2017)

A proof of the vanishing of the first and the third cohomology groups of the Witt algebra with values in the adjoint module is given. The proofs given in the present article are completely algebraic and ... [more ▼]

A proof of the vanishing of the first and the third cohomology groups of the Witt algebra with values in the adjoint module is given. The proofs given in the present article are completely algebraic and independent of any underlying topology. They are a generalization of the ones provided by Schlichenmaier, who proved the vanishing of the second cohomology group using purely algebraic methods. In the case of the third cohomology group though, extra difficulties arise and the involved proofs are distinctly more complicated. [less ▲]

Detailed reference viewed: 71 (10 UL)
Full Text
See detailOnline deliberation: state of the art
Kies, Raphaël UL

E-print/Working paper (2017)

In the last decade, the issue of online deliberation (or web-deliberation) has gained an important visibility among the scholars in the domain of political science, political philosophy, political ... [more ▼]

In the last decade, the issue of online deliberation (or web-deliberation) has gained an important visibility among the scholars in the domain of political science, political philosophy, political communication as well as software designers. It corresponds not only to a topic of analysis – that can be broadly defined as the quantitative and qualitative assessment of the political and public debates online - but also to a democratic model of e-democracy, that aims to shape the different political usage of the web according to the deliberative values. A pertinent way to analyze this broad phenomenon is to subdivide its analysis in three sections which content is partly based on updated findings of my book Promises and Limits of web-deliberation. The first section refers to the deliberative theory on which the empirical research is based. The second section deals with the complex issue of operationalizing the deliberative theory. The last section provides an overview of the online deliberative empirical studies that were conducted this last decade by distinguishing three broad research fields: i) The studies that aim at measuring the usage of the political web-debates and the characteristics of the users; ii) The studies that identify and compare the social and political actors that offer possibilities of online debates; iii) The studies assessing the quality of deliberation in different discursive online settings and the ones aiming at defining the factors that could explain variations in web-deliberation. [less ▲]

Detailed reference viewed: 118 (7 UL)
Full Text
See detailHomotopical algebraic context over differential operators
Di Brino, Gennaro; Pistalo, Damjan UL; Poncin, Norbert UL

E-print/Working paper (2017)

Detailed reference viewed: 107 (18 UL)
Full Text
Peer Reviewed
See detailIs gender in the eye of the beholder? Identifying cultural attitudes with art auction prices
Kräussl, Roman UL; Adams, Renée; Navone, Marco et al

E-print/Working paper (2017)

Detailed reference viewed: 24 (1 UL)
Full Text
See detailTo MigrateWith orWithout Ones’ Children in China - That is the Question
Chen, Yiwen UL; Fromentin, Vincent; Salagean, Ioana et al

E-print/Working paper (2017)

Where should Chinese internal migrant parents locate their school-aged children: migrate with them or leave them behind? And should they invest in private education of their children? Empirical evidence ... [more ▼]

Where should Chinese internal migrant parents locate their school-aged children: migrate with them or leave them behind? And should they invest in private education of their children? Empirical evidence based on the 2009 wave of the Rural-Urban Migration Survey in China (RUMiC) data is inconclusive. We use an overlapping generations model to find a theoretical optimum that maximizes parents’ utility which includes the children’s educational performance. Depending on the educational investment parents make and the relocation cost of children, we provide necessary and sufficient conditions for migrant parents to take their children to migrate and whether they should provide their children with private education. As the choices of migrant parents affect not only their children’s human capital accumulation, but also on the economic potential of their descendants, we present both short- and long-term consequences of the parents decision. [less ▲]

Detailed reference viewed: 82 (6 UL)
Full Text
See detailMultiplicative order and Frobenius symbol for the reductions of number fields
Perucca, Antonella UL

E-print/Working paper (2017)

Detailed reference viewed: 39 (3 UL)
Full Text
See detailStein's Overreaction Puzzle: A Note
Lin, Yuehao; Lehnert, Thorsten UL

E-print/Working paper (2017)

Detailed reference viewed: 15 (1 UL)
Full Text
See detailLarge Portfolio Risk Management and Optimal Portfolio Allocation with Dynamic Elliptical Copulas
Jin, Xisong; Lehnert, Thorsten UL

E-print/Working paper (2017)

Detailed reference viewed: 29 (1 UL)
Full Text
See detailGeneralized Ricci flow II: Existence for complete noncompact manifolds
Li, Yi UL

E-print/Working paper (2017)

Detailed reference viewed: 137 (18 UL)
Full Text
See detailHarnack estimates for nonlinear parabolic equations under the Ricci flow
Li, Yi UL; Zhu, Xiaorui

E-print/Working paper (2017)

In this paper, we consider first the Li-Yau Harnack estimates for a nonlinear parabolic equation $\partial_{t}u=\Delta_{t}u-qu -au(\ln u)^{\alpha}$ under the Ricci flow, where $\alpha>0$ is a constant. To ... [more ▼]

In this paper, we consider first the Li-Yau Harnack estimates for a nonlinear parabolic equation $\partial_{t}u=\Delta_{t}u-qu -au(\ln u)^{\alpha}$ under the Ricci flow, where $\alpha>0$ is a constant. To extend these estimates to a more general situation, in the second part, we consider the gradient estimates for a positive solution of the nonlinear parabolic equation $\partial _{t}u=\Delta _{t}u+hu^{p}$ on a Riemannian manifold whose metrics evolve under the geometric flow $\partial _{t}g(t)=-2S_{g(t)}$. To obtain these estimates, we introduce a quantity $\underline{\boldsymbol{S}}$ along the flow which measures whether the tensor $S_{ij}$ satisfies the second contracted Bianchi identity. Under conditions on ${\rm Ric}_{g(t)}, S_{g(t)}$, and $\underline{\boldsymbol{S}}$, we obtain the gradient estimates. [less ▲]

Detailed reference viewed: 36 (3 UL)
Full Text
See detailA Decoder for a Symbol-Constrained Code (preliminary version)
Franck, Christian UL

E-print/Working paper (2017)

Detailed reference viewed: 62 (8 UL)
Full Text
See detailThe multi-scale analysis of dynamic transmission volatility of carbon prices
Nsouadi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items in this day ... [more ▼]

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items in this day, since the creation of the European carbon market, which has focused on the analysis of volatility transmission between different investment horizons. The purpose of this paper is to fill this gap in the literature. we analyze the volatility of the price of carbon quota (EUA), by studying linear and nonlinear causal relationships of wavelet components between the different volatilities that we captured at different time scales. we initially conducted the decomposition of the EUA price volatility at different time-frequency interval using a wavelet approach. Our study will be to examine whether the volatility is transmitted from the high-frequency structure of the carbon price in the low frequency. Our results show an intra-structural dependance in carbon price volatility. We detect instability in the volatility of carbon and observe the existence of a bidirectional relationship from high frequency traders to low frequency traders. Our study showed that high-frequency shocks yields carbon price can have a significant impact beyond their Fontiers and touch the low frequency structure associated with long-term traders [less ▲]

Detailed reference viewed: 36 (2 UL)
Full Text
See detailInequality and Incentives: The Quasi-Natural Experiment of Hungary, 1914-2008
Mavridis, Dimitrios UL; Mosberger, Palma

E-print/Working paper (2016)

We construct the first top income share series of a formerly socialist economy before, during, and after socialism in order to exploit the effect of the quasi-natural experiment of the absence of markets ... [more ▼]

We construct the first top income share series of a formerly socialist economy before, during, and after socialism in order to exploit the effect of the quasi-natural experiment of the absence of markets on incentives. We investigate top income shares dynamics and the sources of income at the upper tail of the income distribution. Within this setup, we study the effect of capital markets and liberalized wage settings on top income shares. Our estimates show that the introduction of wage-setting decentralization during socialism had a role in increasing the skill premium and income inequality in years prior the transition. [less ▲]

Detailed reference viewed: 68 (11 UL)
Full Text
Peer Reviewed
See detailNotes on a Lie algebraic relation
Korvers, Stéphane UL

E-print/Working paper (2016)

We exhibit explicit orthogonal decompositions of every multidimensional restricted root space of a real semi-simple Lie algebra. We then show a link between this result and a radiality property of smooth ... [more ▼]

We exhibit explicit orthogonal decompositions of every multidimensional restricted root space of a real semi-simple Lie algebra. We then show a link between this result and a radiality property of smooth functions on G-homogeneous spaces when G is a real semi-simple Lie group. [less ▲]

Detailed reference viewed: 31 (0 UL)
Full Text
See detailSocial rights and the new EU economic governance: seeking convergence
Muñoz, Susana UL

E-print/Working paper (2016)

This working paper aims to provide a critical assessment of the impact of the economic and financial crisis on the protection of fundamental social rights in the euro area. It is based on a comparative ... [more ▼]

This working paper aims to provide a critical assessment of the impact of the economic and financial crisis on the protection of fundamental social rights in the euro area. It is based on a comparative analysis of national and European case law in connection with the macroeconomic adjustment programmes in the euro area Member States receiving financial assistance. The austerity measures have been challenged before the relevant authorities at national and European level within the Council of Europe and the EU, with mixed results. It also examines new issues raised by the introduction of the European Stability Mechanism from the angle of fundamental rights. Finally, the initiative for a European Pillar of Social Rights is placed in the broader context of the multilevel protection of social rights in Europe. Converging approaches are needed. [less ▲]

Detailed reference viewed: 17 (0 UL)
Full Text
See detailMobbing am Arbeitsplatz in Luxemburg
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2016)

Die ausgeprägte Mobbingprävalenz in Luxemburg hat sich von 2013 zu 2014 insgesamt leicht erhöht. 2015 ist wiederum ein geringfügiger Rückgang zu verzeichnen. Am stärksten von Mobbing betroffen sind ... [more ▼]

Die ausgeprägte Mobbingprävalenz in Luxemburg hat sich von 2013 zu 2014 insgesamt leicht erhöht. 2015 ist wiederum ein geringfügiger Rückgang zu verzeichnen. Am stärksten von Mobbing betroffen sind Arbeitnehmer in der Altersklasse der 16-24 Jährigen. Arbeitnehmer ab 55 Jahre weisen dagegen die geringste Mobbingprävalenz auf. Differenziert nach Geschlecht, Vollzeit/Teilzeit- und Vorgesetztenstatus ergeben sich über die drei Jahre jeweils nur geringfügige Unterschiede zwischen den Gruppen. Insbesondere Mitarbeiter die schon sehr lange (über 20 Jahre) in dem Betrieb arbeiten, sind seltener von Mobbing betroffen. Kleinere Betriebe (1-4 Mitarbeiter) weisen eine relativ geringe Mobbingprävalenz auf. Dagegen ist die Mobbingprävalenz in Betrieben, die Arbeitsstellen abbauen vergleichsweise hoch. Hilfsarbeitskräfte und Manager weisen eine eher geringe, hingegen Arbeitnehmer in Handwerksberufen die höchste Mobbingprävalenz auf. Betriebe, die häufig Aktionen zur Aufklärung von Gesundheitsproblemen durchführen, weisen geringere Mobbingprävalenzen auf, als Betriebe, die dies nie oder nur unregelmäßig tun. Differenziert nach Nationalität zeigt sich über die drei Erhebungsjahre eine etwas höhere Mobbingprävalenz bei Arbeitnehmern mit luxemburgischer und französischer Nationalität. Arbeitnehmer mit deutscher Nationalität weisen dagegen konstant eine geringere Mobbingprävalenz auf. Die Mobbingprävalenz von Arbeitnehmern mit portugiesischer Nationalität steigt von 2013 zu 2014 an, verringert sich 2015 jedoch wieder etwas. [less ▲]

Detailed reference viewed: 107 (12 UL)
Full Text
See detailRemarks on contact and Jacobi geometry
Bruce, Andrew UL; Grabowska, Katarzyna; Grabowski, Janusz

E-print/Working paper (2016)

We present an approach to Jacobi and contact geometry that makes many facts, presented in the literature in an overcomplicated way, much more natural and clear. The key concepts are Kirillov manifolds and ... [more ▼]

We present an approach to Jacobi and contact geometry that makes many facts, presented in the literature in an overcomplicated way, much more natural and clear. The key concepts are Kirillov manifolds and Kirillov algebroids, i.e. homogeneous Poisson manifolds and, respectively, homogeneous linear Poisson manifolds. The difference with the existing literature is that the homogeneity of the Poisson structure is related to a principal GL(1, R)-bundle structure on the manifold and not just to a vector field. This allows for working with Jacobi bundle structures on nontrivial line bundles and drastically simplifies the picture of Jacobi and contact geometry. In this sense, the properly understood concept of a Jacobi structure is a specialisation rather than a generalisation of a Poission structure. Our results easily reduce to various basic theorems of Jacobi and contact geometry when the principal bundle structure is trivial, as well as give new insight in the theory. For instance, we describe the structure of Lie groupoids with a compatible principal G-bundle structure and the ‘integrating objects’ for Kirillov algebroids, define canonical contact groupoids, and show that any contact groupoid has a canonical realisation as a contact subgroupoid of the latter. [less ▲]

Detailed reference viewed: 44 (5 UL)
Full Text
See detailOn different approaches to compute the Chern classes of a tensor product of two vector bundles
Iena, Oleksandr UL

E-print/Working paper (2016)

We compare four different approaches to compute the Chern classes of a tensor product of two vector bundles in terms of the Chern classes of the factors.

Detailed reference viewed: 50 (4 UL)
Full Text
See detailDifferential Calculus on Z_2^n Supermanifolds
Covolo, Tiffany; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

Detailed reference viewed: 64 (11 UL)
Full Text
See detailPRESS FREEDOM AND JUMPS IN STOCK PRICES
Abed Masror Khah, Sara UL; Lehnert, Thorsten UL

E-print/Working paper (2016)

Press freedom varies substantially across countries. In a free environment, any news becomes immediately public knowledge through mediums including various electronic media and published materials ... [more ▼]

Press freedom varies substantially across countries. In a free environment, any news becomes immediately public knowledge through mediums including various electronic media and published materials. However, in an unfree environment, (economic) agents would have more discretionary power to disclose good news immediately, while hiding bad news or releasing bad news slowly. We argue that this discretion is affecting stock prices and stock markets in countries with a free press should be better processors of economic information. Using an equilibrium asset-pricing model in an economy under jump diffusion, we decompose the moments of the returns of international stock markets into a diffusive risk and jump risk part. Using stock market data for a balanced panel of 50 countries, our results suggest that in countries with a free press, the better processing of bad news leads to more frequent negative jumps in stock prices. As a result, stock markets in those countries are characterized by higher volatility, driven by the higher jump risk, and more negative return asymmetry. Results are robust to the inclusion of various controls for governance and other country- or market-specific characteristics. We interpret this as good stock market characteristics, because a free press improves welfare and increases economic growth. [less ▲]

Detailed reference viewed: 519 (75 UL)
Full Text
See detailpopulation Aging and Inventive Activity
Irmen, Andreas UL; Litina, Anastasia UL

E-print/Working paper (2016)

This research empirically establishes and theoretically motivates the hypothesis that population aging has a hump-shaped effect on inventive activity. We estimate this hump-shaped relationship in a panel ... [more ▼]

This research empirically establishes and theoretically motivates the hypothesis that population aging has a hump-shaped effect on inventive activity. We estimate this hump-shaped relationship in a panel of 33 OECD countries over the period 1960-2012. The increasing part of the hump captures the awareness that population aging requires inventive activity to guarantee current and future standards of living. The decreasing part reflects the tendency of aging societies to lose dynamism and the willingness to take risks. Policy-wise our analysis suggests that raising the awareness of individuals about the consequences of population aging may facilitate the adoption of strategies and policies encouraging inventive activity and economic growth. [less ▲]

Detailed reference viewed: 59 (2 UL)
Full Text
See detailEndogenous Factor Income Distribution - When Piketty meets Romer -
Irmen, Andreas UL; Tabakovic, Amer UL

E-print/Working paper (2016)

We scrutinize Thomas Piketty’s (2014) theory concerning the relationship between an economy’s long-run growth rate, its capital-income ratio, and its factor income distribution put forth in his recent ... [more ▼]

We scrutinize Thomas Piketty’s (2014) theory concerning the relationship between an economy’s long-run growth rate, its capital-income ratio, and its factor income distribution put forth in his recent book Capital in the Twenty-First Century. We find that a smaller long-run growth rate may be associated with a smaller capital-income ratio. Hence, the key implication of Piketty’s Second Fundamental Law of Capitalism does not hold. In line with Piketty’s theory a smaller long-run growth rate may go together with a greater capital share. However, the mechanics behind this result are the opposite of what Piketty suggests. Our findings obtain in variants of Romer’s (1990) seminal model of endogenous technological change. Here, both the economy’s savings rate and its growth rate are endogenous variables whereas in Piketty’s theory they are both exogenous parameters. Including demographic growth in the spirit of Jones (1995) shows that a smaller growth rate of the economy may imply a lower capital share contradicting a central claim in Piketty’s book. [less ▲]

Detailed reference viewed: 68 (6 UL)
Full Text
Peer Reviewed
See detailHybrid mesh/particle meshless method for modeling geological flows with discontinuous transport properties
Bourantas, Georgios UL; Lavier, Luc; van Dam, Tonie UL et al

E-print/Working paper (2016)

In the present paper, we introduce the Finite Difference Method-Meshless Method (FDM-MM) in the context of geodynamical simulations. The proposed numerical scheme relies on the well-established FD method ... [more ▼]

In the present paper, we introduce the Finite Difference Method-Meshless Method (FDM-MM) in the context of geodynamical simulations. The proposed numerical scheme relies on the well-established FD method along with the newly developed “meshless” method and, is considered as a hybrid Eulerian/Lagrangian scheme. Mass, momentum, and energy equations are solved using an FDM method, while material properties are distributed over a set of markers (particles), which represent the spatial domain, with the solution interpolated back to the Eulerian grid. The proposed scheme is capable of solving flow equations (Stokes flow) in uniform geometries with particles, “sprinkled” in the spatial domain and is used to solve convection- diffusion problems avoiding the oscillation produced in the Eulerian approach. The resulting algebraic linear systems were solved using direct solvers. Our hybrid approach can capture sharp variations of stresses and thermal gradients in problems with a strongly variable viscosity and thermal conductivity as demonstrated through various benchmarking test cases. The present hybrid approach allows for the accurate calculation of fine thermal structures, offering local type adaptivity through the flexibility of the particle method. [less ▲]

Detailed reference viewed: 193 (14 UL)
Full Text
See detailWavelet Dynamic Conditional Correlation GARCH model : WDCC-GARCH
Nsaoudi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

Detailed reference viewed: 71 (0 UL)
Full Text
See detailA global description of the fine Simpson moduli space of 1-dimensional sheaves supported on plane quartics
Iena, Oleksandr UL

E-print/Working paper (2016)

A global description of the fine Simpson moduli spaces of 1-dimensional sheaves supported on plane quartics is given: we describe the gluing of the Brill-Noether loci described by Drézet and Maican and ... [more ▼]

A global description of the fine Simpson moduli spaces of 1-dimensional sheaves supported on plane quartics is given: we describe the gluing of the Brill-Noether loci described by Drézet and Maican and show that the Simpson moduli space M=M_{4m±1}(P_2) is a blow-down of a blow-up of a projective bundle over a smooth moduli space of Kronecker modules. An easy computation of the Poincaré polynomial of M is presented. [less ▲]

Detailed reference viewed: 47 (17 UL)
Full Text
See detailMultiscale hedge ratio between the spot and future prices of carbon: Wavelet Based Approach
Nsouadi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

Detailed reference viewed: 69 (7 UL)
Full Text
See detailGemeinwesenarbeit als relationale skalierungssensible Örtlichkeitsarbeit
Uhler, Nicolas; Haas, Claude UL; Marthaler, Thomas UL

E-print/Working paper (2016)

Detailed reference viewed: 31 (2 UL)
Full Text
Peer Reviewed
See detailBorders : conceptual framework
Roelens, Nathalie UL

E-print/Working paper (2016)

Detailed reference viewed: 50 (0 UL)
Full Text
See detailIntegration on colored supermanifolds
Grabowski, Janusz; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

Detailed reference viewed: 49 (5 UL)
Full Text
See detailThe Frobenius theorem for Z^n_2-supermanifolds
Covolo, Tiffany UL; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

Detailed reference viewed: 73 (2 UL)
Full Text
See detailKrichever-Novikov type algebras and Wess-Zumino-Witten models
Schlichenmaier, Martin UL

E-print/Working paper (2015)

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus and/or the multi-point situation. They play a ... [more ▼]

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus and/or the multi-point situation. They play a very important role in the context of quantization of Conformal Field Theory. In this review we give the most important results about their structure, almost-grading and central extensions. Furthermore, we explain how they are used in the context of Wess--Zumino--Novikov--Witten models, respectively Knizhnik-Zamolodchikov connections. There they play a role as gauge algebras, as tangent directions to the moduli spaces, and as Sugawara operators. [less ▲]

Detailed reference viewed: 34 (1 UL)
Full Text
See detailOn four Koszul-Tate resolutions
Pistalo, Damjan UL; Poncin, Norbert UL

E-print/Working paper (2015)

Detailed reference viewed: 114 (29 UL)
Full Text
See detailValuing American options using fast recursive projections
Cosma, Antonio UL; Galluccio, Stefano; Pederzoli, Paola et al

E-print/Working paper (2015)

We introduce a fast and widely applicable numerical pricing method that uses recursive projections. We characterize its convergence speed. We find that the early exercise boundary of an American call ... [more ▼]

We introduce a fast and widely applicable numerical pricing method that uses recursive projections. We characterize its convergence speed. We find that the early exercise boundary of an American call option on a discrete dividend paying stock is higher under the Merton and Heston models than under the Black-Scholes model, as opposed to the continuous dividend case. A large database of call options on stocks with quarterly dividends shows that adding stochastic volatility and jumps to the Black-Scholes benchmark reduces the amount foregone by call holders failing to optimally exercise by 25%. Transaction fees cannot fully explain the suboptimal behavior. [less ▲]

Detailed reference viewed: 62 (8 UL)
Full Text
See detailN point Virasoro algebras considered as Krichever-Novikov type algebras
Schlichenmaier, Martin UL

E-print/Working paper (2015)

We explain how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and ... [more ▼]

We explain how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied by Schlichenmaier. Using this more general point of view, useful structural insights and an easier access to calculations can be obtained. As example, explicit expressions for the three-point situation are given. This is a write-up of a talk presented at the Bialowieza meeting in 2015. Details can be found in a recent manuscript by the author. [less ▲]

Detailed reference viewed: 23 (1 UL)
Full Text
Peer Reviewed
See detailThe Demand for Diversification in Incomplete Markets
Mehra, Rajnish UL; Wahal, Sunil; Xie, Daruo

E-print/Working paper (2015)

Detailed reference viewed: 52 (4 UL)
Full Text
Peer Reviewed
See detailWeyl type quantization for some symplectic symmetric spaces
Korvers, Stéphane UL

E-print/Working paper (2015)

Detailed reference viewed: 13 (0 UL)
Full Text
See detailN-point Virasoro algebras are multi-point Krichever--Novikov type algebras
Schlichenmaier, Martin UL

E-print/Working paper (2015)

We show how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied ... [more ▼]

We show how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied by Schlichenmaier. Using this more general point of view, useful structural insights and an easier access to calculations can be obtained. The concept of almost-grading will yield information about triangular decompositions which are of importance in the theory of representations. As examples the algebra of functions, vector fields, differential operators, current algebras, affine Lie algebras, Lie superalgebras and their central extensions are studied. Very detailed calculations for the three-point case are given. [less ▲]

Detailed reference viewed: 40 (6 UL)
Full Text
See detailPension insecurity and well-being in Europe
Olivera Angulo, Javier UL; Ponomarenko, Valentina UL

E-print/Working paper (2015)

This paper studies pension insecurity in a sample of non-retired individuals aged 50 years or older from 18 European countries. We relate pension insecurity with the subjective expectations on the ... [more ▼]

This paper studies pension insecurity in a sample of non-retired individuals aged 50 years or older from 18 European countries. We relate pension insecurity with the subjective expectations on the probability that the government will reduce the pensions of the individual before retirement or will increase the statutory retirement age. We argue that changes in economic conditions and policy affect the formation of such probabilities, and through this, subjective wellbeing. In particular, we study the effects of pension insecurity on subjective wellbeing with pooled OLS models, regressions per quintiles and instrumental variables. We find a statistically significant, stable and negative association between pension insecurity and subjective wellbeing. The quintile regressions allow us to establish that pension insecurity is more salient for individuals who are poorer, who subjectively assess their life survival rate as low and who have higher cognitive abilities. [less ▲]

Detailed reference viewed: 264 (64 UL)
Full Text
See detailWell-being differences in old-age in Europe: the Active Ageing Index by cohorts
Olivera Angulo, Javier UL

E-print/Working paper (2015)

The goal of this paper is to study and explain the differences in wellbeing in old age across cohorts and countries in Europe. This is done with the replication of the Active Ageing Index for cohorts ... [more ▼]

The goal of this paper is to study and explain the differences in wellbeing in old age across cohorts and countries in Europe. This is done with the replication of the Active Ageing Index for cohorts formed by age group, sex and country for 2012. The analysis is performed with different model regressions at the cohort level and introducing macro variables at the country level. In general, there is a gap in active ageing in detriment of females which is larger in older cohorts. In addition, wealth, equity and pension settings of the country are important predictors for better active ageing. Finally, it is found that the Social-Democratic welfare regime (Nordic countries) with its set of strong redistributive policies, is the most favourable system for active ageing. [less ▲]

Detailed reference viewed: 226 (82 UL)
Full Text
Peer Reviewed
See detailOn the Impact of Exclusion Filters Rules in Option Pricing
Lehnert, Thorsten UL; Dennis, Brams; Gildas, Blanchard

E-print/Working paper (2015)

Detailed reference viewed: 20 (0 UL)
Full Text
Peer Reviewed
See detailThe Impact of Uncertainty in the Oil and Gold Market on the Cross-Section
Lehnert, Thorsten UL; Bams, Dennis; Blanchard, Gildas et al

E-print/Working paper (2015)

Detailed reference viewed: 48 (0 UL)
Full Text
See detailHedonic adaptation to a treatment. Evidence from a medical intervention
Barazzetta, Marta UL; Appleton, Simon; Owens, Trudy

E-print/Working paper (2015)

We investigate adaptation of subjective well-being using a randomized controlled trial. We find that providing medical equipment to a random sample of Ugandan adults with lower limb disabilities has a ... [more ▼]

We investigate adaptation of subjective well-being using a randomized controlled trial. We find that providing medical equipment to a random sample of Ugandan adults with lower limb disabilities has a positive effect on their physical health, using both objective and self-reported measures. Treated patients experience a significant improvement in life satisfaction initially, but the effect is not prolonged. After one year, life satisfaction returns to the pre-treatment level, supporting the hypothesis of adaptation. This evidence of adaptation is supported by observations of changes in aspirations and expectations and is robust to alternative estimation methods including instrumental variable estimation and ITT analysis. [less ▲]

Detailed reference viewed: 50 (3 UL)
Full Text
Peer Reviewed
See detailToward a pecking order theory of strategic resource deployment
Kräussl, Roman UL; Schulze, William; Deeds, David et al

E-print/Working paper (2015)

Detailed reference viewed: 41 (0 UL)
Full Text
See detailWohnmobilität in der Großregion - eine interurbane Diskursanalyse
Christmann, Nathalie UL

E-print/Working paper (2015)

“Je t’aime, moi non plus” : this is how the French newspaper L’Express (2011, p. II) summarises the transnational linkages of Luxembourg with its neighbouring countries. On the one hand, the ‘economic ... [more ▼]

“Je t’aime, moi non plus” : this is how the French newspaper L’Express (2011, p. II) summarises the transnational linkages of Luxembourg with its neighbouring countries. On the one hand, the ‘economic engine’ Luxembourg offers workplaces for many commuters, positively affecting the development of this European cross-border polycentric metropolitan region; on the other hand, negative consequences such as the overcrowded real estate mar-ket in Luxembourg continue beyond the national border and affect neighbouring housing markets. The ‘2020 Concept for the Region Trier’ shows that city councils perceive the prox-imity to Luxembourg as an opportunity for the development of the city. Simultaneously, lo-cals might feel displaced due to increasing rents and house prices, and develop resentment vis-à-vis their new neighbours, coming either from Luxembourg, or being Belgian, German or French nationals (labour migrants) that have moved to the border region to work in the Grand Duchy of Luxembourg, thus disposing of higher purchase power. Depending on the context, similar effects can thus be perceived very differently by city councils or planners and the local population. So far, studies dealing with the processes of transmigration have mostly focussed on indi-vidual motives of migrants, whereas impacts on the regions of destination have not been explored. The aim of this study is to explore ongoing discourses dealing with spatial impacts in relation to urban housing markets within the Greater Region. The focus will be on the cit-ies Arlon (BE), Metz and Thionville (FR), and Trier (DE). Therefore mixed methods will be de-ployed. Firstly, a quantitative analysis is planned to reveal the magnitude and the spatial distribution of the (cross-border) residential mobility. The evolution of housing prices and rents as well as population dynamics will be examined. Secondly, ongoing discourses and the changes of life-worlds will be studied using quantitative methods as well as qualitative methods, such as content analysis, to review the guiding principles of municipal policy and urban planning documents. A quantitative analysis of local newspapers will be conducted to analyse public opinion. A content analysis of this material will follow. The method mix allows us to better understand “material” evolutions and to trace the current discourses within this field. Discourse approaches have become common in interdis-ciplinary social science academic research. However, there are no established theoretical and methodological guidelines for applying these approaches. This project has to deal with this situation and to take into account different cultural backgrounds and discussion levels. This study will help to frame today’s situation and aims to develop sustainable solutions for future urban planning. [less ▲]

Detailed reference viewed: 511 (12 UL)
Full Text
Peer Reviewed
See detailEuro Crash Risk
Kräussl, Roman UL; Lehnert, Thorsten UL; Sigita, Senulyte

E-print/Working paper (2015)

Detailed reference viewed: 25 (0 UL)
Full Text
Peer Reviewed
See detailIs Venture Capital really a Local Business? Evidence from U.S. Cross-Border Investment
Kräussl, Roman UL; Wuebker,, Robert; Schulze, William

E-print/Working paper (2015)

Detailed reference viewed: 26 (0 UL)
Full Text
See detailMultilingualism in advertising and a shifting balance of languages in Luxembourg
De Bres, Julia UL

E-print/Working paper (2015)

Much research on multilingualism in advertising has been undertaken in comparatively mono-lingual settings. Whereas such research may provide insights into the connotations of lan-guages used in ... [more ▼]

Much research on multilingualism in advertising has been undertaken in comparatively mono-lingual settings. Whereas such research may provide insights into the connotations of lan-guages used in advertising, research in more multilingual contexts can also provide different kinds of insights regarding the relative status of languages in a multilingual environment. This article focuses on multilingualism in written advertising in the highly multilingual setting of Luxembourg, where the language situation is currently undergoing significant change due to patterns of globalisation and migration. Analysis of a mixed corpus of advertisements, includ-ing 1,038 advertisements in the free daily newspaper l’Essentiel from 2009 to 2011, as well as selected further advertisements from elsewhere within Luxembourg’s linguistic landscape, reflects a move within Luxembourg in general from a longstanding trilingualism in French, German and Luxembourgish to different kinds of multilingualism, incorporating both the presence of new languages and changes in the relative roles of French, German and Luxem-bourgish. Particularly significant is the presence of Luxembourgish as a written language of advertising, whereas it traditionally functioned mainly as a spoken language in Luxembourg. The article presents the results of a quantitative and qualitative analysis of the advertisements and discusses how multilingualism in written advertising provides a pertinent window on changing forms of multilingualism in Luxembourg. [less ▲]

Detailed reference viewed: 191 (17 UL)
Full Text
Peer Reviewed
See detailCredit risk characteristics of US small business portfolios
Wolff, Christian UL

E-print/Working paper (2015)

Detailed reference viewed: 25 (0 UL)
Full Text
Peer Reviewed
See detailDoes the CAMEL bank rating system follow a pro-cyclical pattern?
Wolff, Christian UL

E-print/Working paper (2015)

Detailed reference viewed: 56 (2 UL)