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)
This paper analyzes structured P2P systems where peers choose both their interaction mode, i.e., how they process incoming queries, and additional contacts in the network autonomously. Since additional contacts incur additional costs, a new kind of free riding behavior, namely having only few contacts, comes into the fray. We refer to it as deliberately(More)
Structured peer-to-peer networks manage large data sets. Each peer administers a part of the data. To answer a query, several peers must collaborate. However, experience with peer-to-peer file sharing systems shows that peers tend to abandon collaboration. Such behaviour is also expected in structured peer-to-peer systems. In the recent past, protocols for(More)