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Concealing Presence Information in Instant Messaging Systems.pdf

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Concealing Presence Information in Instant Messaging Systems

BAMBERGER BEITRA?GE ZUR WIRTSCHAFTSINFORMATIK UND ANGEWANDTEN INFORMATIK ISSN 0937-3349 Nr. 66 Concealing Presence Information in Instant Messaging Systems Markus Dorsch, Martin Grote, Knut Hildebrandt, Maximilian Ro?glinger, Matthias Sehr, Christian Wilms, Karsten Loesing, and Guido Wirtz April 2006 FAKULTA?T WIRTSCHAFTSINFORMATIK UND ANGEWANDTE INFORMATIK OTTO-FRIEDRICH-UNIVERSITA?T BAMBERG Distributed and Mobile Systems Group Otto-Friedrich Universita?t Bamberg Feldkirchenstr. 21, 96052 Bamberg, GERMANY Prof. Dr. rer. nat. Guido Wirtz http://www.uni-bamberg.de/en/fakultaeten/wiai/faecher/informatik/lspi/ Due to hardware developments, strong application needs and the overwhelming influence of the net in almost all areas, distributed and mobile systems, especially software systems, have become one of the most important topics for nowadays software industry. Unfortunately, distri- bution adds its share to the problems of developing complex software systems. Heterogeneity in both, hardware and software, concurrency, distribution of components and the need for inter- operability between different systems complicate matters. Moreover, new technical aspects like resource management, load balancing and deadlock handling put an additional burden onto the developer. Although subject to permanent changes, distributed systems have high requirements w.r.t. dependability, robustness and performance. The long-term common goal of our research efforts is the development, implementation and evaluation of methods helpful for the development of robust and easy-to-use software for com- plex systems in general while putting a focus on the problems and issues regarding the software development for distributed as well as mobile systems on all levels. Our current research acti- vities are focussed on different aspects centered around that theme: ? Robust and adaptive Service-oriented Architectures: Development of design methods, lan- guages and middleware to ease the development of SOAs