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Yolanda von Vianden und das Yolanda-Epos Sieburg, Heinz E-print/Working paper (in press) Detailed reference viewed: 56 (3 UL)The Farrell--Tate and Bredon homology for PSL_4(Z) and other arithmetic groups ; Rahm, Alexander ; 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: 75 (8 UL)The edge-based strain smoothing method for compressible and nearly incompressible non-linear elasticity for solid mechanics ; ; et al E-print/Working paper (in press) Detailed reference viewed: 408 (33 UL)Genuine Bianchi modular forms of higher level, at varying weight and discriminant Rahm, Alexander ; Tsaknias, Panagiotis 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: 119 (15 UL)On the Cohomological Crepant Resolution Conjecture for the complexified Bianchi orbifolds ; Rahm, Alexander 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: 60 (1 UL)Le surpoids chez les élèves au Luxembourg Heinz, Andreas 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: 3 (0 UL)Les problèmes de santé des élèves luxembourgeois Heinz, Andreas 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: 3 (0 UL)La satisfaction de vie des élèves au Luxembourg Heinz, Andreas 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: 7 (0 UL)Russians in Luxembourg: Русские в Вильтце - история первых эмигрантов Ganschow, Inna 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: 16 (4 UL)Russians in Luxembourg, WWII: Поиски старого друга Ganschow, Inna 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: 22 (6 UL)When Time Breaks: The Hiatus of Refugee Status Van Der Walt, Johan Willem Gous 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: 23 (7 UL)Parallel and hybrid soft-thresholding algorithms with line search for sparse nonlinear regression Yang, Yang ; ; Chatzinotas, Symeon et al E-print/Working paper (2018) Detailed reference viewed: 64 (8 UL)Successive convex approximation algorithms for sparse signal estimation with nonconvex regularizations Yang, Yang ; ; Chatzinotas, Symeon et al E-print/Working paper (2018) Detailed reference viewed: 73 (7 UL)The Credit Structure Database Leon, Florian 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: 52 (2 UL)Expediting in Two-Echelon Spare Parts Inventory Systems Drent, Melvin ; Arts, Joachim 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: 71 (16 UL)Risk and Refugee Migration Joxhe, Majlinda ; ; 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: 9 (1 UL)Attacks and Countermeasures for White-box Designs Biryukov, Alex ; Udovenko, Aleksei 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: 324 (5 UL)Méthodologie de l’étude « Health Behaviour in School-aged Children » Heinz, Andreas ; Kern, Matthias Robert ; Residori, Caroline et al E-print/Working paper (2018) Detailed reference viewed: 62 (18 UL)Long-term finance and entrepreneurship Leon, Florian 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: 18 (7 UL)Fragebogen HBSC 2018 (enseignement fondamental) Heinz, Andreas E-print/Working paper (2018) Detailed reference viewed: 38 (4 UL)Fragebogen HBSC 2018 (enseignement secondaire) Heinz, Andreas E-print/Working paper (2018) Detailed reference viewed: 26 (2 UL)Do banks and microfinance institutions compete? Microevidence from Madagascar Leon, Florian ; 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: 55 (12 UL)WHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE? Lehnert, Thorsten 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: 33 (2 UL)Big Moves of Mutual Funds Lehnert, Thorsten E-print/Working paper (2018) Detailed reference viewed: 10 (0 UL)Governance and Price Jumps Lehnert, Thorsten 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: 9 (0 UL)FEniCS-Shells: an open-source library for simulating thin structures Hale, Jack ; ; Bordas, Stéphane et al E-print/Working paper (2018) Simulating thin structures implies solving non-linear partial differential equations defined on manifolds, which can include higher-order derivatives and/or stiff terms. Implementing effective locking ... [more ▼] Simulating thin structures implies solving non-linear partial differential equations defined on manifolds, which can include higher-order derivatives and/or stiff terms. Implementing effective locking-free discretisation techniques for nonlinear plates and shells is a challenging and highly technical task. We present FEniCS-Shells, an open-source library for simulating thin structures using the finite element method, based on the FEniCS Project. Leveraging the high-level symbolic capabilities of the Unified Form Language (UFL) and the automatic code generation facilities of the FENICS Form Compiler (FFC), FEniCS-Shells allows for the concise formulation of discretisations of various thin-structural theories, including linear and nonlinear geometrically exact Naghdi shell models, the Marguerre-von Kármán shallow shell model, and the Reissner-Mindlin plate model. Mixed Interpolation of Tensorial Component (MITC) and Partial Selective Reduced Integration (PSRI) numerical methods are used to alleviate shear- and membrane-locking issues. The effectiveness of these approaches and the ease of writing solvers for non-linear shell models is illustrated through a large set of verification tests and demo codes. FEniCS-Shells can run without modification on high-performance computing (HPC) architectures. [less ▲] Detailed reference viewed: 55 (3 UL)Mutant Quality Indicators Papadakis, Mike ; Titcheu Chekam, Thierry ; Le Traon, Yves E-print/Working paper (2018) Detailed reference viewed: 81 (4 UL)Das Verbot der Werbung für den ärztlichen Schwangerschaftsabbruch (§219a StGB) verstößt gegen vorrangiges europäisches Recht Gerkrath, Jörg E-print/Working paper (2017) Detailed reference viewed: 59 (1 UL)Gesundheitsbeschwerden von Schülern in Luxemburg Heinz, Andreas ; Kern, Matthias Robert ; Residori, Caroline et al E-print/Working paper (2017) Detailed reference viewed: 34 (13 UL)Zur Methodik der Studie "Health Behaviour in School-aged Children" Heinz, Andreas ; Kern, Matthias Robert ; Residori, Caroline et al E-print/Working paper (2017) Detailed reference viewed: 58 (29 UL)Die allgemeine Lebenszufriedenheit von Schülern in Luxemburg Kern, Matthias Robert ; Residori, Caroline ; Heinz, Andreas et al E-print/Working paper (2017) Detailed reference viewed: 38 (12 UL)Übergewicht bei Schülern in Luxemburg Residori, Caroline ; Kern, Matthias Robert ; Heinz, Andreas et al E-print/Working paper (2017) Detailed reference viewed: 28 (10 UL)Who Trade at Better Prices? Wolff, Christian ; E-print/Working paper (2017) Detailed reference viewed: 13 (0 UL)State of the Art in Lightweight Symmetric Cryptography Biryukov, Alex ; Perrin, Léo Paul 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: 343 (7 UL)What makes Data Science different? A discussion involving Statistics2.0 and Computational Sciences ; Bordas, Stéphane 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: 451 (30 UL)Migration, Labor Tasks and Production Structure in Europe Joxhe, Majlinda ; ; 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: 39 (6 UL)Real-time Error Control for Surgical Simulation Bui, Huu Phuoc ; Tomar, Satyendra ; Bordas, Stéphane 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: 260 (22 UL)Quantum moment maps and retracts for bounded symmetric domains Korvers, Stéphane E-print/Working paper (2017) Detailed reference viewed: 22 (2 UL)Wealth accumulation over the life course. The role of disadvantages across the employment history Ponomarenko, Valentina 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: 160 (3 UL)Multiplicative order and Frobenius symbol for the reductions of number fields Perucca, Antonella E-print/Working paper (2017) Detailed reference viewed: 33 (3 UL)A Decoder for a Symbol-Constrained Code (preliminary version) Franck, Christian E-print/Working paper (2017) Detailed reference viewed: 51 (7 UL)Polynomial quadratic differentials on the complex plane and light-like polygons in the Einstein Universe Tamburelli, Andrea 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: 35 (1 UL)Harnack estimates for nonlinear parabolic equations under the Ricci flow Li, Yi ; 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: 30 (3 UL)Politische, soziale und rechtliche Systeme und der "westkulturelle Pluralismus" Marthaler, Thomas ; Haas, Claude E-print/Working paper (2017) Detailed reference viewed: 16 (2 UL)Homotopical algebraic context over differential operators ; Pistalo, Damjan ; Poncin, Norbert E-print/Working paper (2017) Detailed reference viewed: 79 (15 UL)Generalized Ricci flow II: Existence for complete noncompact manifolds Li, Yi E-print/Working paper (2017) Detailed reference viewed: 129 (18 UL)Harnack estimates for a heat-type equation under the geometric flow Li, Yi ; E-print/Working paper (2017) Detailed reference viewed: 52 (1 UL)Large Portfolio Risk Management and Optimal Portfolio Allocation with Dynamic Elliptical Copulas ; Lehnert, Thorsten E-print/Working paper (2017) Detailed reference viewed: 15 (1 UL)Stein's Overreaction Puzzle: A Note ; Lehnert, Thorsten E-print/Working paper (2017) Detailed reference viewed: 13 (1 UL)On the Naturalness of Mutants Jimenez, Matthieu ; Cordy, Maxime ; Kintis, Marinos et al E-print/Working paper (2017) Detailed reference viewed: 28 (5 UL)The Vanishing of Low-Dimensional Cohomology Groups of the Witt and the Virasoro algebra Ecker, Jill Marie-Anne ; Schlichenmaier, Martin 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: 60 (10 UL)To MigrateWith orWithout Ones’ Children in China - That is the Question Chen, Yiwen ; ; 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: 74 (6 UL)Online deliberation: state of the art Kies, Raphaël 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: 99 (7 UL)The Missing Risk Premium in Exchange Rates Penasse, Julien ; E-print/Working paper (2017) Detailed reference viewed: 14 (0 UL)Functional inequalities on manifolds with non-convex boundary Cheng, Li Juan ; Thalmaier, Anton ; Thompson, James E-print/Working paper (2017) In this article, new curvature conditions are introduced to establish functional inequalities including gradient estimates, Harnack inequalities and transportation-cost inequalities on manifolds with non ... [more ▼] In this article, new curvature conditions are introduced to establish functional inequalities including gradient estimates, Harnack inequalities and transportation-cost inequalities on manifolds with non-convex boundary. [less ▲] Detailed reference viewed: 54 (14 UL)Quantifying the uncertainty in a hyperelastic soft tissue model with stochastic parameters Hauseux, Paul ; Hale, Jack ; et al E-print/Working paper (2017) We present a simple open-source semi-intrusive computational method to propagate uncertainties through hyperelastic models of soft tissues. The proposed method is up to two orders of magnitude faster than ... [more ▼] We present a simple open-source semi-intrusive computational method to propagate uncertainties through hyperelastic models of soft tissues. The proposed method is up to two orders of magnitude faster than the standard Monte Carlo method. The material model of interest can be altered by adjusting few lines of (FEniCS) code. The method is able to (1) provide the user with statistical confidence intervals on quantities of practical interest, such as the displacement of a tumour or target site in an organ; (2) quantify the sensitivity of the response of the organ to the associated parameters of the material model. We exercise the approach on the determination of a confidence interval on the motion of a target in the brain. We also show that for the boundary conditions under consideration five parameters of the Ogden-Holzapfel-like model have negligible influence on the displacement of the target zone compared to the three most influential parameters. The benchmark problems and all associated data are made available as supplementary material. [less ▲] Detailed reference viewed: 407 (75 UL)Räumliche Identifikationen und Identifizierungen in Grenzregionen. Das Beispiel der Großregion SaarLorLux Wille, Christian 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: 179 (18 UL)The multi-scale analysis of dynamic transmission volatility of carbon prices ; Terraza, Virginie 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: 27 (2 UL)Inequality and Incentives: The Quasi-Natural Experiment of Hungary, 1914-2008 Mavridis, Dimitrios ; 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: 62 (11 UL)Notes on a Lie algebraic relation Korvers, Stéphane 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: 17 (0 UL)Boosting Early Language as a Foundation for Literacy – Essential but neither Simple nor Easy ; Engel de Abreu, Pascale ; Ertel Silva, Cintia E-print/Working paper (2016) Detailed reference viewed: 93 (9 UL)Mobbing am Arbeitsplatz in Luxemburg Sischka, Philipp ; Steffgen, Georges 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: 98 (12 UL)Remarks on contact and Jacobi geometry Bruce, Andrew ; ; 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: 42 (5 UL)On different approaches to compute the Chern classes of a tensor product of two vector bundles Iena, Oleksandr 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: 48 (4 UL)"Erwachsene" als relationale-Personen-in-Skalierungsarbeit-an-Orten-in-der-Zeit Haas, Claude ; Marthaler, Thomas E-print/Working paper (2016) Detailed reference viewed: 15 (3 UL)Wissenschaftliches Schreiben als relationale und sklaierungssensible Erfindung von Wirklichkeiten Marthaler, Thomas ; Haas, Claude E-print/Working paper (2016) Detailed reference viewed: 12 (1 UL)Elemente eines relationalen und skalierungssensiblen Konzepts für Ausstellungen und andere "Arrangements" am Beispiel eines Museums für Wohlfahrtsgeschichte Marthaler, Thomas ; Haas, Claude E-print/Working paper (2016) Detailed reference viewed: 12 (2 UL)Gemeinwesenarbeit als relationale skalierungssensible Örtlichkeitsarbeit ; Haas, Claude ; Marthaler, Thomas E-print/Working paper (2016) Detailed reference viewed: 20 (2 UL)Wavelet Dynamic Conditional Correlation GARCH model : WDCC-GARCH ; Terraza, Virginie E-print/Working paper (2016) Detailed reference viewed: 59 (0 UL)PRESS FREEDOM AND JUMPS IN STOCK PRICES Abed Masror Khah, Sara ; Lehnert, Thorsten 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: 500 (75 UL)Multiscale hedge ratio between the spot and future prices of carbon: Wavelet Based Approach ; Terraza, Virginie E-print/Working paper (2016) Detailed reference viewed: 58 (7 UL)population Aging and Inventive Activity Irmen, Andreas ; Litina, Anastasia 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: 48 (1 UL)A global description of the fine Simpson moduli space of 1-dimensional sheaves supported on plane quartics Iena, Oleksandr 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: 46 (17 UL)Hybrid mesh/particle meshless method for modeling geological flows with discontinuous transport properties Bourantas, Georgios ; ; van Dam, Tonie 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: 179 (14 UL)Endogenous Factor Income Distribution - When Piketty meets Romer - Irmen, Andreas ; Tabakovic, Amer 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: 55 (5 UL)Unfairness perceptions at work Barazzetta, Marta ; D'Ambrosio, Conchita ; E-print/Working paper (2016) This works investigates the effect of unfair income on subjective well-being and job quits. Following the fair-wage hypothesis (Akerlof, 1982, Akerlof and Yellen, 1990), empirical evidence has shown that ... [more ▼] This works investigates the effect of unfair income on subjective well-being and job quits. Following the fair-wage hypothesis (Akerlof, 1982, Akerlof and Yellen, 1990), empirical evidence has shown that individuals change their economic behaviour according to fairness considerations. Another side of the literature, based on the relative income hypothesis (Duesberry, 1949), has provided a large amount of evidence that people do not evaluate outcomes only in absolute terms but also relative to some reference levels. We contribute to these two strands of literature exploring the effect of perceiving own income as unfair on subjective well-being. Using five waves of the German Socio-Economic Panel (SOEP), we find that those who perceive to earn an unfair income have significantly lower subjective well-being, both in terms of cognitive evaluations (life and job satisfaction) and emotional health. The results are robust to the inclusion of both absolute and relative measures of income. The negative effect of unfair pays is translated into a higher probability of quitting the job, confirming the importance of fairness considerations for labour relations. [less ▲] Detailed reference viewed: 205 (13 UL)The Frobenius theorem for Z^n_2-supermanifolds Covolo, Tiffany ; Kwok, Stephen ; Poncin, Norbert E-print/Working paper (2016) Detailed reference viewed: 71 (2 UL)Differential Calculus on Z_2^n Supermanifolds ; Kwok, Stephen ; Poncin, Norbert E-print/Working paper (2016) Detailed reference viewed: 60 (11 UL)Integration on colored supermanifolds ; Kwok, Stephen ; Poncin, Norbert E-print/Working paper (2016) Detailed reference viewed: 46 (5 UL)Elemente eines relationalen Konzepts des betreuten Wohnens von jungen Erwachsenen "im Übergang in die Autonomie" Marthaler, Thomas ; Haas, Claude E-print/Working paper (2016) Detailed reference viewed: 17 (2 UL)Borders : conceptual framework Roelens, Nathalie E-print/Working paper (2016) Detailed reference viewed: 48 (0 UL)Krichever-Novikov type algebras and Wess-Zumino-Witten models Schlichenmaier, Martin 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: 31 (1 UL)On four Koszul-Tate resolutions Pistalo, Damjan ; Poncin, Norbert E-print/Working paper (2015) Detailed reference viewed: 94 (28 UL)Valuing American options using fast recursive projections Cosma, Antonio ; ; 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: 59 (8 UL)N point Virasoro algebras considered as Krichever-Novikov type algebras Schlichenmaier, Martin 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: 22 (1 UL)The Demand for Diversification in Incomplete Markets Mehra, Rajnish ; ; E-print/Working paper (2015) Detailed reference viewed: 51 (4 UL)Weyl type quantization for some symplectic symmetric spaces Korvers, Stéphane E-print/Working paper (2015) Detailed reference viewed: 11 (0 UL)Robust Precoding for Multibeam Satellite Channels with Phase Uncertainty Gharanjik, Ahmad ; Shankar, Bhavani E-print/Working paper (2015) Detailed reference viewed: 94 (9 UL)N-point Virasoro algebras are multi-point Krichever--Novikov type algebras Schlichenmaier, Martin 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: 39 (6 UL)Pension insecurity and well-being in Europe Olivera Angulo, Javier ; Ponomarenko, Valentina 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: 254 (64 UL)Well-being differences in old-age in Europe: the Active Ageing Index by cohorts Olivera Angulo, Javier 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: 217 (82 UL)On the Impact of Exclusion Filters Rules in Option Pricing Lehnert, Thorsten ; ; E-print/Working paper (2015) Detailed reference viewed: 19 (0 UL)The Impact of Uncertainty in the Oil and Gold Market on the Cross-Section Lehnert, Thorsten ; ; et al E-print/Working paper (2015) Detailed reference viewed: 46 (0 UL)Language profiles and practices of cross-border workers in Luxembourg Franziskus, Anne ; De Bres, Julia E-print/Working paper (2015) This paper summarises the findings of a questionnaire study investigating the language pro-files and practices of cross-border workers in Luxembourg. The study was undertaken in 2009 and includes 128 ... [more ▼] This paper summarises the findings of a questionnaire study investigating the language pro-files and practices of cross-border workers in Luxembourg. The study was undertaken in 2009 and includes 128 cross-border workers from 35 workplaces from different sectors, including the health sector, higher education and research, the manufacturing industry and the service sector. The study suggests that all the participants have a multilingual profile and have learnt at least one language in addition to their first one in the course of their life. A second result is that French is used in all the workplaces under investigation. But, at the same time, the major-ity of the cross-border worker participants have a multilingual professional life, most of them using more than one language at work on an everyday basis. This multilingualism comes in the form of a wide range of multilingual practices, including language accommodation, use of a lingua franca, code-switching and receptive multilingualism. Furthermore, two thirds of the participants report having learnt Luxembourgish either formally or informally, and half of those who have not learnt it, would like to do so in the future. [less ▲] Detailed reference viewed: 93 (4 UL)Wohnmobilität in der Großregion - eine interurbane Diskursanalyse Christmann, Nathalie 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: 499 (12 UL)Hedonic adaptation to a treatment. Evidence from a medical intervention Barazzetta, Marta ; ; 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: 47 (3 UL)International vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung Wille, Christian ; ; Heimböckel, Dieter E-print/Working paper (2015) Die vorliegende vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung wurde im Zuge der Einrichtungen des fakultären Schwerpunktbereichs MIS – Mehrsprachigkeit ... [more ▼] Die vorliegende vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung wurde im Zuge der Einrichtungen des fakultären Schwerpunktbereichs MIS – Mehrsprachigkeit und Interkulturelle Studien durchgeführt. Ziel war es zentrale Orientierungspunkte für eine strategische Positionierung und für zukünftige Entwicklungslinien des Schwerpunktbereichs zu gewinnen. Dafür wurden die Internetseiten von 64 vergleichbaren Einrichtungen bzw. Arbeitszusammenhängen der Interkulturalitätsforschung inhaltsanalytisch untersucht. Zur Stichprobe zählen in erster Linie eigenständige Zentren und Institute/Abteilungen aus dem universitären Kontext mit international breit gestreuten Standorten; Arbeitszusammenhänge bzw. Einrichtungen aus dem deutschsprachigen Raum sind besonders gut vertreten. [less ▲] Detailed reference viewed: 113 (9 UL)Euro Crash Risk Kräussl, Roman ; Lehnert, Thorsten ; E-print/Working paper (2015) Detailed reference viewed: 23 (0 UL)Toward a pecking order theory of strategic resource deployment Kräussl, Roman ; ; et al E-print/Working paper (2015) Detailed reference viewed: 38 (0 UL)Espaces de frontière. Penser et analyser la frontière en tant qu’espace Wille, Christian E-print/Working paper (2015) Les frontières se différencient non seulement en fonction des domaines d'étude où elles sont opérantes ou dans lesquels elles se constituent, mais également en termes de modes de (re)production et de ... [more ▼] Les frontières se différencient non seulement en fonction des domaines d'étude où elles sont opérantes ou dans lesquels elles se constituent, mais également en termes de modes de (re)production et de formes. Cette communication traitera en premier lieu de la forme de la frontière, sachant que ce n’est pas la frontière territoriale en tant que ligne qui importera, mais plutôt son caractère zonal et la question de savoir comment il est possible de l'aborder dans une perspective théorico-conceptuelle aux fins de l’étude empirique. Il est plus judicieux de considérer les frontières territoriales comme zones ou espaces, la métaphore de la ligne s'avérant une pure fiction. Jusqu’au XVIIIe siècle, les frontières étaient conçues comme des espaces de contact et des zones de transition (convoitées), ce n’est qu’avec l’avènement d’États nationaux modernes que s’établit le concept de frontière comme ligne – sans qu’elle n’ait perdu empiriquement son caractère zonal. C’est ce qu’on peut notamment constater dans les régions transfrontalières où les frontières territoriales ne peuvent se réduire à leur fonction de différenciation ou de passerelle, mais au contraire s’élargissent – comme le montre la mobilité transfrontalière des travailleurs, des consommateurs ainsi que la mobilité résidentielle – se transformant ainsi en zones de l'entre-deux. Ces zones ne peuvent pas être concédées aux espaces situés en deçà et au-delà d’une frontière territoriale, elles représentent en revanche des espaces autonomes, lesdits « espaces de frontière » qui revêtent une identité liminale. L'objet de cette communication est de savoir comment il est possible de décrire et d'étudier de tels espaces que l'on peut observer comme productions quotidiennes. Il s’agit (1) de percevoir de manière conceptuelle le caractère zonal de la frontière, donc la dimension spatiale, (2) le potentiel innovateur et imprévisible de la liminalité et ainsi la contingence sociale. La géographie sociale et la sociologie de la culture en livrent des points de départ pertinents. La mise en relation d’approches concernant l’espace et la pratique sociale issues de ces deux disciplines représente la base du modèle « espaces de frontière » qui permet de penser les frontières en tant qu’espaces et met en place une heuristique destinée à l’étude de constitutions spatiales centrées sur le sujet comme (re)productions des frontières. Les pratiques sociales, la connaissance pratique ainsi que les aspects physico-matériels et socio-structurels tels qu'ils sont appropriés et engendrés par les « frontaliers » dans des références transfrontalières, font partie des catégories d'analyse. [less ▲] Detailed reference viewed: 220 (24 UL) |
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