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'We live, work, play in social spaces – both online and offline.' [Lueg and Fisher, 2003] 'Man is a social animal.' online group interaction predates the internet (email mailing lists, Usenet) today: surge in web-based social software realize vision of the 'read-write web' [Lawson, 2005] Beyond the web? web is a document-centric system documents authored(More)
With the emergence of mobile devices, Web services are made available for users in nearly all situations of every day life. While the WWW offers a multitude of Web services there is a lack of search engines which support the users in finding adequate services out of the bulk of available Web services. Within this paper, we will introduce a context-sensitive(More)
As a result of the anonymity in todays Web search, it is not possible to receive a personalized search result. Neither prior search results nor search results from other users are taken into consideration. In order to resolve this anonymity towards the search engine, a system is created which locally stores the search results in the scope of a peer-to-peer(More)
In the context of large homogeneous retrieval systems, metrics like precision and recall have been established to assess the effectiveness. Nevertheless , measuring Web search effectiveness is a new challenge regarding the het-erogeneity of highly dynamic Web content. Currently, users select a Web search engine by their individual preferences and the(More)
In this diploma thesis, we research whether the inclusion of information about an information user's social environment and his position in the social network of his peers leads to an improval in search effectiveness. Traditional information retrieval methods fail to address the fact that information production and consumption are social activities. We(More)
Information acquisition is a great challenge in the context of a continually growing Web. Nowadays, large Web search engines are primarily designed to assist an information pull by the user. On this platform, only actual information needs are handled without assistance of long-term needs. To overcome these shortcomings we propose a cooperative system for(More)
Knowledge Management Systems (KMSs) are of increasing interest in economy to collect, store and re–use company–relevant knowledge as a resource to gain productivity. In this paper we demonstrate how to leverage structured information for its efficient re–use. We propose the development of ontologies to represent the knowledge to be stored. As it is anyhow(More)
abstract Social information spaces are characterized by the presence of a social network between participants. In this chapter we present methods for utilizing social networks for information retrieval by applying graph authority measures to the social network. We show how to integrate authority measures in an information retrieval algorithm. In order to(More)