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Auflistung nach Autor:in "Baumann, Stephan"

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  • Konferenzbeitrag
    Cloudy transactions: cooperative XML authoring on Amazon S3
    (Datenbanksysteme für Business, Technologie und Web (BTW), 2011) Gropengießer, Francis; Baumann, Stephan; Sattler, Kai-Uwe
    Over the last few years cloud computing has received great attention in the research community. Customers are entitled to rent infrastructure, storage, and even software in form of services. This way they just have to pay for the actual use of these components or services. Cloud computing also comes with great opportunities for distributed design applications, which often require multiple users to work cooperatively on shared data. In order to enable cooperation, strict consistency is necessary. However, cloud storage services often provide only eventual consistency. In this paper, we propose a system that allows for strict consistent and cooperative XML authoring in distributed environments based on Amazon S3. Our solution makes use of local and distributed transactions, which are synchronized in an optimistic fashion, in order to ensure correctness. An important contribution of this paper is the evaluation of our system in a real deployment scenario upon Amazon S3. We show the strong impact of write operations to S3 on the transaction throughput. Furthermore, we show that fragmenting data increases write performance and reduces storage costs.
  • Konferenzbeitrag
    Gesture-based navigation in graph databases - the kevin bacon game
    (Datenbanksysteme für Business, Technologie und Web (BTW) 2047, 2013) Beier, Felix; Baumann, Stephan; Betz, Heiko; Hagedorn, Stefan; Wagner, Timo
    Motion sensing devices like Microsoft's Kinect offer an alternative to traditional computer input devices like keyboards and mouses. Graph databases can naturally make use of gesture control as traversing graphs can easily be described by swiping or pointing gestures. In our demo we traverse the Internet Movie Database (IMDB) using a Kinect interface with the control logic in our data stream engine AnduIN. The gesture detection is done based on AnduIN's complex event processing functionality.
  • Zeitschriftenartikel
    Musikempfehlungssysteme Userzentriert und kontextbasiert
    (Informatik-Spektrum: Vol. 28, No. 5, 2005) Baumann, Stephan
    Durch den zunehmenden Einzug des Computers in zahlreiche Bereiche des täglichen Lebens liegt immer mehr multimediale Information in digitalisierter Form vor.