Date Bsarbeten Ansicht Geh 中·命·自p r's Bibsonomy::r bookmarks BibTex Semigroup or Fig 1. Bibsonomy displays bookmarks and(BIBTEXbased) bibliographic references on the already existing tags, and additional tags, ultimately leading towards emergent semantics(Staab et al.(2002), Steels(1998)) by converging use of the same vocabulary. In this sense, knowledge discovery(KDD)techniques are a promising tool for bottom-up building of conceptual structures In this paper, we will focus on a selected KDD technique, namely association rules. Since folksonomies provide a three-dimensional dataset(users, tags, and resources)instead of a usual two-dimensional one(items and transactions we present first a systematic overview of projecting a folksonomy onto a two- dimensional structure. Then we will show the results of mining rules from two selected projections on the del icio us system This paper is organized as follows. Section 2 reviews recent developments in the area of social bookmark systems, and presents a formal model In Section 3 we briefly recall the notions of association rules, before providing a systematic overview over the projections of a folksonomy onto a two-dimensional dataset in Section 4 In Section 5, we present the results of mining association rules on data of the del icio us system. Section 6 concludes the paper with a discussion of further research topics on knowledge discovery within folksonomies 2 Social Resource Sharing and Folksonomies ocial resource sharing systems are web-based systems that allow users to up- load their resources, and to label them with names. The systems can be distin- guished according to what kind of resources are supported. Flickr, for instance allows the sharing of photos, del.icio us" the sharing of bookmarks, CiteULike and Connotea the sharing of bibliographic references, and 43Things?'even the sharing of goals in private life. Our own upcoming system, called Bib Sonomy, will allow to share simultaneously bookmarks and BIBTEX entries(see Fig. 1) In their core, these systems are all very similar. Once a user is logged in, he can add a resource to the system, and assign arbitrary labels, so-called 3http://www.flickr.com/ OUs tp://www.citeulike.or http://www.connotea.org/ 7http://www.43things.com/ http://www.bibsonomy.org 2Fig. 1. Bibsonomy displays bookmarks and (BibTEXbased) bibliographic references simultaneously. on the already existing tags, and additional tags, ultimately leading towards emergent semantics (Staab et al. (2002), Steels (1998)) by converging use of the same vocabulary. In this sense, knowledge discovery (KDD) techniques are a promising tool for bottom-up building of conceptual structures. In this paper, we will focus on a selected KDD technique, namely association rules. Since folksonomies provide a three-dimensional dataset (users, tags, and resources) instead of a usual two-dimensional one (items and transactions), we present first a systematic overview of projecting a folksonomy onto a two￾dimensional structure. Then we will show the results of mining rules from two selected projections on the del.icio.us system. This paper is organized as follows. Section 2 reviews recent developments in the area of social bookmark systems, and presents a formal model. In Section 3, we briefly recall the notions of association rules, before providing a systematic overview over the projections of a folksonomy onto a two-dimensional dataset in Section 4. In Section 5, we present the results of mining association rules on data of the del.icio.us system. Section 6 concludes the paper with a discussion of further research topics on knowledge discovery within folksonomies. 2 Social Resource Sharing and Folksonomies Social resource sharing systems are web-based systems that allow users to up￾load their resources, and to label them with names. The systems can be distin￾guished according to what kind of resources are supported. Flickr,3 for instance, allows the sharing of photos, del.icio.us4 the sharing of bookmarks, CiteULike5 and Connotea6 the sharing of bibliographic references, and 43Things7 even the sharing of goals in private life. Our own upcoming system, called BibSonomy, 8 will allow to share simultaneously bookmarks and BibTEX entries (see Fig. 1). In their core, these systems are all very similar. Once a user is logged in, he can add a resource to the system, and assign arbitrary labels, so-called 3 http://www.flickr.com/ 4 http://del.icio.us/ 5 http://www.citeulike.org/ 6 http://www.connotea.org/ 7 http://www.43things.com/ 8 http://www.bibsonomy.org 2