Cornelia Metzig

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Mandelbrot found that financial time series had fat tails and long dependence. Over the years a variety of empirical work has found these two properties to hold in many different financial time series. There are two alternative ways to model fat tails and long dependence. One, a stochastic process that is generated by the sub-ordination of a levy process to(More)
In many of the large-scale physical and social complex systems phenomena fat-tailed distributions occur, for which different generating mechanisms have been proposed. In this paper, we study models of generating power law distributions in the evolution of large-scale taxonomies such as Open Directory Project, which consist of websites assigned to one of(More)
In the context of web-scale taxonomies such as Mozilla and Yahoo! 1 directories, previous works have shown the existence of power law distribution in the size of the categories for every level in the tax-onomy. In this work, we analyse how such high-level semantics can be leveraged to evaluate accuracy of hierarchical classifiers which automatically assign(More)
(Arrêté ministériel du 7 août 2006) Spécialité : physique de la matière condensée et du rayonnement Modélisation des propriétés structurales, électroniques et optiques des nanofils de nitrures GaN/AlN Modeling of the structural, electronic and optical properties of GaN/AlN nitride nanowires (Arrêté ministériel du 7 août 2006) Spécialité : physique de la(More)
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