Stephan Schosser

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For our experiment on corruption, we designed a coordination game to model the influence of risk attitudes, beliefs, and information on behavioral choices and determined the equilibria. We observed that the participants' risk attitudes failed to explain their choices between corrupt and non-corrupt behavior. Instead, beliefs appeared to be a better(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)
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 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)
The history of humankind is an epic of cooperation, which is ubiquitous across societies and increasing in scale. Much human cooperation occurs where it is risky to cooperate for mutual benefit because successful cooperation depends on a sufficient level of cooperation by others. Here we show that arginine vasopressin (AVP), a neuropeptide that mediates(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)
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)