BibSonomy publications for /author/HothoThu Mar 11 08:21:57 CET 2010Journal of Web Semantics2124-143Semantic Web Mining: State of the Art and Future Directions42006imported Tue Mar 09 15:33:02 CET 2010Berlin, HeidelbergSemantic Web. Wege zur vernetzten Wissensgesellschaft273-289Kollaboratives Wissensmanagement2006social_tagging social_bookmarking_literatur knowledge_management collective_intelligence Tue Mar 09 15:33:02 CET 2010AmsterdamAI Communications4231-247Tag Recommendations in Social Bookmarking Systems212008tagging recommendation bookmarking Collaborative tagging systems allow users to assign keywords - so called "tags" - to resources. Tags are used for navigation, finding resources and serendipitous browsing and thus provide an immediate benefit for users. These systems usually include tag recommendation mechanisms easing the process of finding good tags for a resource, but also consolidating the tag vocabulary across users. In practice, however, only very basic recommendation strategies are applied. In this paper we evaluate and compare several recommendation algorithms on large-scale real life datasets: an adaptation of user-based collaborative filtering, a graph-based recommender built on top of the FolkRank algorithm, and simple methods based on counting tag occurences. We show that both FolkRank and Collaborative Filtering provide better results than non-personalized baseline methods. Moreover, since methods based on counting tag occurrences are computationally cheap, and thus usually preferable for real time scenarios, we discuss simple approaches for improving the performance of such methods. We show, how a simple recommender based on counting tags from users and resources can perform almost as good as the best recommender. Tue Mar 09 15:33:02 CET 2010Banff, CanadaWorkshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007Organizing Publications and Bookmarks in BibSonomy2007tagorapub organizing l3s itegpub challenge bibsonomy BibSonomy 2007 Tue Mar 09 15:33:02 CET 2010Berlin, HeidelbergProceedings of the 15th International Conference on Conceptual Structures (ICCS 2007)July283--295Lecture Notes in Artificial IntelligenceAnalysis of the Publication Sharing Behaviour in {BibSonomy}46042007trias social, myown, iccs, folksonomy, fca, bookmarking, bibsonomy, analysis, 2007, BibSonomy is a web-based social resource sharing system which allows users to organise and share bookmarks and publications in a collaborative manner. In this paper we present the system, followed by a description of the insights in the structure of its bibliographic data that we gained by applying techniques we developed in the area of Formal Concept Analysis.Tue Mar 09 15:33:02 CET 2010Proceedings of the Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structuressubtag-supertag87--102BibSonomy: A social bookmark and publication sharing system2006imported Abstract. Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies and briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references in a kind of personal library. 1Tue Mar 09 15:33:02 CET 2010HeidelbergThe Semantic Web: Research and ApplicationsJune411-426Lecture Notes in Computer ScienceInformation Retrieval in Folksonomies: Search and Ranking40112006search retrieval ranking folksonomy Tue Mar 09 15:33:02 CET 2010BonnInformatik 2006 -- Informatik für Menschen. Band 2OctoberProc. Workshop on Applications of Semantic Technologies, Informatik 2006Lecture Notes in InformaticsEmergent Semantics in BibSonomyP-942006recommendation bibsonomy Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies, briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references, and discuss first steps towards emergent semantics.Tue Mar 02 17:29:44 CET 2010Berlin/HeidelbergThe Semantic Web -- ISWC 2008615--631Lecture Notes in Computer ScienceSemantic Grounding of Tag Relatedness in Social Bookmarking Systems53182008tagging social semantic relatedness grounding folksonomy bookmarking Collaborative tagging systems have nowadays become important data sources for populating semantic web applications. For tasks like synonym detection and discovery of concept hierarchies, many researchers introduced measures of tag similarity. Eventhough most of these measures appear very natural, their design often seems to be rather ad hoc, and the underlying assumptionson the notion of similarity are not made explicit. A more systematic characterization and validation of tag similarity interms of formal representations of knowledge is still lacking. Here we address this issue and analyze several measures oftag similarity: Each measure is computed on data from the social bookmarking system del.icio.us and a semantic grounding isprovided by mapping pairs of similar tags in the folksonomy to pairs of synsets in Wordnet, where we use validated measuresof semantic distance to characterize the semantic relation between the mapped tags. This exposes important features of theinvestigated similarity measures and indicates which ones are better suited in the context of a given semantic application.Tue Mar 02 13:56:53 CET 2010Raleigh, NC, USAProceedings of the 19th International World Wide Web Conference (WWW 2010)apr(to appear)Stop Thinking, start Tagging - Tag Semantics emerge from Collaborative Verbosity2010www2010 www myown collaborative_verbosity 2010 Tue Mar 02 13:56:38 CET 2010Raleigh, NC, USAProceedings of the 2nd Web Science Conference (WebSci09)(to appear)Semantics made by you and me: Self-emerging ontologies can capture the diversity of shared knowledge2010websci09 websci web_science semantics myown 2010 Tue Mar 02 09:12:22 CET 2010Proceedings of the Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures87--102BibSonomy: A social bookmark and publication sharing system2006citie Tue Mar 02 09:07:20 CET 2010Data Science and Classification261--270Mining Association Rules in Folksonomies2006mining folksonomy associationRule association Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. These systems provide currently relatively few structure. We discuss in this paper, how association rule mining can be adopted to analyze and structure folksonomies, and how the results can be used for ontology learning and supporting emergent semantics. We demonstrate our approach on a large scale dataset stemming from an online system.Mon Mar 01 18:12:39 CET 2010BonnInformatik 2006 -- Informatik für Menschen. Band 2octProc. Workshop on Applications of Semantic Technologies, Informatik 2006Lecture Notes in InformaticsEmergent Semantics in BibSonomyP-942006semantics network folksonomy Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies, briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references, and discuss first steps towards emergent semantics.Sat Feb 27 03:41:22 CET 2010New York, NY, USAWWW '09: Proceedings of the 18th international conference on World wide web641--650Evaluating similarity measures for emergent semantics of social tagging2009sys:relevantFor:social_web imported Thu Feb 25 14:23:45 CET 2010J. Web Sem.138-53Discovering shared conceptualizations in folksonomies62008stumme schmitz jaeschke hotho ganter Wed Feb 24 17:07:20 CET 2010BonnInformatik 2006 -- Informatik für Menschen. Band 2octProc. Workshop on Applications of Semantic Technologies, Informatik 2006Lecture Notes in InformaticsEmergent Semantics in BibSonomyP-942006SemanticWeb Network Folksonomy Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies, briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references, and discuss first steps towards emergent semantics.Wed Feb 24 17:04:43 CET 2010Amsterdam, The NetherlandsAI Communicationsdec4245--262Network properties of folksonomies202007Network Measures Folksonomy Social resource sharing systems like YouTube and del.icio.us have acquired a large number of users within the last few years. They provide rich resources for data analysis, information retrieval, and knowledge discovery applications. A first step towards this end is to gain better insights into content and structure of these systems. In this paper, we will analyse the main network characteristics of two of these systems. We consider their underlying data structures - so-called folksonomies - as tri-partite hypergraphs, and adapt classical network measures like characteristic path length and clustering coefficient to them. Subsequently, we introduce a network of tag co-occurrence and investigate some of its statistical properties, focusing on correlations in node connectivity and pointing out features that reflect emergent semantics within the folksonomy. We show that simple statistical indicators unambiguously spot non-social behavior such as spam. Wed Feb 24 11:27:26 CET 2010New York, NY, USAHT '09: Proceedings of the 20th ACM Conference on Hypertext and Hypermediajun323--324Managing publications and bookmarks with BibSonomy2009myown bibsonomy 2009 In this demo we present BibSonomy, a social bookmark and publication sharing system.Wed Feb 24 11:27:05 CET 2010Workshop on Knowledge Discovery, Data Mining, and Machine Learningsep44 --51Testing and Evaluating Tag Recommenders in a Live System2009tagging recommender myown framework folksonomy bibsonomy 2009 The challenge to provide tag recommendations for collaborative tagging systems has attracted quite some attention of researchers lately. However, most research focused on evaluation anddevelopment of appropriate methods rather than tackling the practical challenges of how to integrate recommendation methods into real tagging systems, record and evaluate their performance.In this paper we describe the tag recommendation framework we developed for our social bookmark and publication sharing system BibSonomy. With the intention to develop, test, and evaluate recommendation algorithms and supporting cooperation with researchers, we designed the framework to be easily extensible,open for a variety of methods, and usable independent from BibSonomy. Furthermore, this paper presents an evaluation of two exemplarily deployed recommendation methods, demonstratingthe power of the framework.