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  • Rethinking Pension Reform : Ten Myths about Social Security Systems

    Börsch-Supan, Axel (2000)
    Before coming to substance, a brief introductory remark: Although the paper claims to be deliberately provocative, I found only one really provocative statement in it, on the bottom of the first page, namely that the paper is "nuanced". "Nuanced" is certainly a matter of perspective. The paper's narrow-minded view may be helpful for a perspective centering on the United Kingdom or the United States where the development has gone far in the direction of private defined contribution (DC) plans....

    Demokratisches Engagement und soziale Medien : Medienbasierte Beteiligungsformen im Kontext der Demokratiebewegung in Ägypten 2011

    Röder-Tzellos, Maria (2014)
    This study examines the ways in which young Egyptians used social media during the uprising in 2011 in distinct and complementary ways. It does not focus on the role of social media for institutionalized groups or movements to organize and coordinate protest participation more effectively, but on the varying ways in which social media is used to constitute individual protest engagement and civic empowerment. This engagement might emerge into the formation of a protest collective, but it is mo...

    Signalanalyse-Verfahren zur Segmentierung von Multimediadaten

    Haenselmann, Thomas (2004)
    Im Rahmen der Segmentierung sollten Objekte in digitalen Bildern und (medizinischen) Volumendaten vom Hintergrund abgegrenzt werden. Ein Schwerpunkt dieser Arbeit liegt darauf, ein Bild geeigneten Transformationen zu unterziehen, um die Segmentierung so zuverlässlich wie möglich zu machen. Insbesondere wird die Eignung unterschiedlicher Transformationen analysiert und zu Erkenntnissen aus der mathematischen Statistik in Bezug gesetzt.

    Efficient image segmentation using partial differential equations and morphology

    Weickert, Joachim (2000)
    The goal of this paper is to investigate segmentation methods that combine fast preprocessing algorithms using partial differential equations (PDEs) with a watershed transformation with region merging. We consider two well-founded PDE methods: a nonlinear isotropic diffusion filter that permits edge enhancement, and a convex nonquadratic variational image restoration method which gives good denoising. For the diffusion filter, an efficient algorithm is applied using an additive operator split...

    PDE-based preprocessing of medical images

    Weickert, Joachim; Schnörr, Christoph (2000)
    Medical imaging often requires a preprocessing step where filters are applied that remove noise while preserving semantically important structures such as edges. This may help to simplify subsequent tasks such as segmentation. One class of recent adaptive denoising methods consists of methods based on nonlinear partial differential equations (PDEs). In the present paper we survey our recent results on PDE-based preprocessing methods that may be applied to medical imaging problems. We focus on...
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