Stephan Schosser

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Due to the increasing usage of small and low footprinted devices like mobile phones as clients of mobile information systems a new problem arises: " How to determine the relevance of updates for a large number of mobile clients? " In this paper we present an indexing scheme that represents conjunctive queries posed by the mobile clients in a trie. So, IDs(More)
Structured peer-to-peer systems allow to administer large volumes of data. Several peers collaborate to generate a query result. Analyses of unstructured peer-to-peer systems, namely of those for file-sharing, show that peers tend to shirk collaboration. We anticipate similar behavior in structured peer-to-peer systems. Recently, protocols to counter(More)
Structured P2P systems are a prominent representative of a class of systems where participants communicate via a given structure. Peers in such systems must show cooperative behavior, to avoid performance degradation of the system. Economic literature has proposed various mechanisms to stimulate cooperation. Their effectiveness strongly depends on the(More)
Due to the increasing usage of small and low footprinted devices like mobile phones as clients of mobile information systems a new problem arises: " How to determine the relevance of updates for a large number of mobile clients? " In this paper we present an indexing scheme that represents conjunctive queries posed by the mobile clients in a trie. So, IDs(More)
Due to the increasing usage of small and low footprinted devices like mobile phones as clients of mobile information systems a new problem arises: " How to determine the relevance of updates for a large number of mobile clients? " In this paper we present an indexing scheme that represents conjunctive queries posed by the mobile clients in a trie. So, IDs(More)
In the last years, distributed coordinator-free systems, e.g., peer-to-peer systems (P2P systems), have attracted much interest among researchers and practitioners. In these systems it is difficult to motivate participants to cooperate. To this end, researchers have proposed various incentive mechanisms. In this paper we are interested in the following(More)
Collaborative tagging is increasingly drawing attentions. However the keyword based tagging scheme has its limitations and it can be observed that tagging society are seeking and using new tagging patterns. This paper proposes a subject-predicate-object scheme for users to triple tag web resources. We first introduce the triple tag model and discuss its(More)