users of social bookmarking systems in assigning tags to their
bookmarks. Content based recommenders are the usual approach for
facing the cold start problem, i.e., when a bookmark is uploaded for
the first time and no information from other users can be exploited.
In this paper, we evaluate several recommendation algorithms in a
cold-start scenario on a large real-world dataset.
ER - TY - CONF AU - Illig, Jens AU - Hotho, Andreas AU - Jäschke, Robert AU - Stumme, Gerd A2 - T1 - A Comparison of content-based Tag Recommendations in Folksonomy Systems T2 - Postproceedings of the International Conference on Knowledge Processing in Practice (KPP 2007) PB - Springer C1 - PY - 2011/ CY - VL - IS - SP - EP - UR - DO - KW - 2011 KW - content KW - folksonomy KW - itegpub KW - l3s KW - myown KW - recommendations KW - recommender KW - tag KW - tagorapub L1 - SN - N1 - N1 - AB - ER - TY - CHAP AU - Hotho, Andreas AU - Jäschke, Robert AU - Benz, Dominik AU - Grahl, Miranda AU - Krause, Beate AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Blumauer, Andreas A2 - Pellegrini, Tassilo T1 - Social Bookmarking am Beispiel BibSonomy T2 - Social Semantic Web PB - Springer C1 - Berlin, Heidelberg PY - 2009/ VL - IS - SP - 363 EP - 391 UR - http://dx.doi.org/10.1007/978-3-540-72216-8_18 DO - 10.1007/978-3-540-72216-8 KW - 2009 KW - info20 KW - itegpub KW - l3s KW - myown KW - tagorapub L1 - SN - 978-3-540-72215-1 N1 - N1 - AB - BibSonomy ist ein kooperatives Verschlagwortungssystem (Social Bookmarking System), betrieben vom Fachgebiet Wissensverarbeitung
der Universität Kassel. Es erlaubt das Speichern und Organisieren von Web-Lesezeichen und Metadaten für wissenschaftlichePublikationen. In diesem Beitrag beschreiben wir die von BibSonomy bereitgestellte Funktionalität, die dahinter stehende Architektursowie das zugrunde liegende Datenmodell. Ferner erläutern wir Anwendungsbeispiele und gehen auf Methoden zur Analyse der in BibSonomy und ähnlichen Systemen enthaltenen Daten ein. ER - TY - CONF AU - Markines, Benjamin AU - Cattuto, Ciro AU - Menczer, Filippo AU - Benz, Dominik AU - Hotho, Andreas AU - Stumme, Gerd A2 - T1 - Evaluating Similarity Measures for Emergent Semantics of Social Tagging T2 - 18th International World Wide Web Conference PB - C1 - PY - 2009/04 CY - VL - IS - SP - 641 EP - 650 UR - http://www2009.eprints.org/65/ DO - KW - 2009 KW - folksonomies KW - itegpub KW - l3s KW - measures KW - myown KW - similarity KW - sitc KW - sna KW - social_similarity KW - sota KW - tag KW - tagging KW - tagorapub KW - www2009 L1 - SN - N1 - N1 - AB - Social bookmarking systems and their emergent information structures, known as folksonomies, are increasingly important data sources for Semantic Web applications. A key question for harvesting semantics from these systems is how to extend and adapt traditional notions of similarity to folksonomies, and which measures are best suited for applications such as navigation support, semantic search, and ontology learning. Here we build an evaluation framework to compare various general folksonomy-based similarity measures derived from established information-theoretic, statistical, and practical measures. Our framework deals generally and symmetrically with users, tags, and resources. For evaluation purposes we focus on similarity among tags and resources, considering different ways to aggregate annotations across users. After comparing how tag similarity measures predict user-created tag relations, we provide an external grounding by user-validated semantic proxies based on WordNet and the Open Directory. We also investigate the issue of scalability. We ?nd that mutual information with distributional micro-aggregation across users yields the highest accuracy, but is not scalable; per-user projection with collaborative aggregation provides the best scalable approach via incremental computations. The results are consistent across resource and tag similarity. ER - TY - JOUR AU - Cattuto, Ciro AU - Schmitz, Christoph AU - Baldassarri, Andrea AU - Servedio, Vito D. P. AU - Loreto, Vittorio AU - Hotho, Andreas AU - Grahl, Miranda AU - Stumme, Gerd T1 - Network Properties of Folksonomies JO - AI Communications Journal, Special Issue on ``Network Analysis in Natural Sciences and Engineering'' PY - 2007/ VL - 20 IS - 4 SP - 245 EP - 262 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2007/cattuto2007network.pdf DO - KW - 2007 KW - emergent KW - fca KW - folksonomies KW - folksonomy KW - itegpub KW - l3s KW - myown KW - network KW - semantics KW - tagorapub L1 - SN - N1 - N1 - AB - ER - TY - JOUR AU - Cattuto, Ciro AU - Schmitz, Christoph AU - Baldassarri, Andrea AU - Servedio, Vito D. P. AU - Loreto, Vittorio AU - Hotho, Andreas AU - Grahl, Miranda AU - Stumme, Gerd T1 - Network Properties of Folksonomies JO - AI Communications Journal, Special Issue on ``Network Analysis in Natural Sciences and Engineering'' PY - 2007/ VL - 20 IS - 4 SP - 245 EP - 262 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2007/cattuto2007network.pdf DO - KW - 2007 KW - semantics KW - emergent KW - folksonomy KW - tagorapub KW - folksonomies KW - l3s KW - network KW - itegpub KW - fca L1 - SN - N1 - See http://www.bibsonomy.org/bibtex/2e1a5234a896b1f422473b1fe5d91e26b/stumme for a shorter workshop version. N1 - AB - ER - TY - JOUR AU - Cattuto, Ciro AU - Schmitz, Christoph AU - Baldassarri, Andrea AU - Servedio, Vito D. P. AU - Loreto, Vittorio AU - Hotho, Andreas AU - Grahl, Miranda AU - Stumme, Gerd T1 - Network Properties of Folksonomies JO - AI Communications Journal, Special Issue on ``Network Analysis in Natural Sciences and Engineering'' PY - 2007/ VL - 20 IS - 4 SP - 245 EP - 262 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2007/cattuto2007network.pdf DO - KW - 2007 KW - emergent KW - fca KW - folksonomies KW - folksonomy KW - itegpub KW - l3s KW - myown KW - network KW - semantics KW - seminar2009 KW - tagorapub L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - ER - TY - CONF AU - Jäschke, Robert AU - Grahl, Miranda AU - Hotho, Andreas AU - Krause, Beate AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Alani, Harith A2 - Noy, Natasha A2 - Stumme, Gerd A2 - Mika, Peter A2 - Sure, York A2 - Vrandecic, Denny T1 - Organizing Publications and Bookmarks in BibSonomy T2 - Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007 PB - C1 - Banff, Canada PY - 2007/ CY - VL - IS - SP - EP - UR - http://www2007.org/workshops/paper_25.pdf DO - KW - 2007 KW - BibSonomy KW - bibsonomy KW - challenge KW - itegpub KW - l3s KW - myown KW - organizing KW - tagorapub L1 - SN - N1 - N1 - AB - ER - TY - CONF AU - Jäschke, Robert AU - Grahl, Miranda AU - Hotho, Andreas AU - Krause, Beate AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Alani, Harith A2 - Noy, Natasha A2 - Stumme, Gerd A2 - Mika, Peter A2 - Sure, York A2 - Vrandecic, Denny T1 - Organizing Publications and Bookmarks in BibSonomy T2 - Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007 PB - C1 - Banff, Canada PY - 2007/ CY - VL - IS - SP - EP - UR - http://www2007.org/workshops/paper_25.pdf DO - KW - challenge KW - 2007 KW - organizing KW - BibSonomy KW - bibsonomy KW - tagorapub KW - l3s KW - itegpub L1 - SN - N1 - N1 - AB - ER - TY - CONF AU - Jäschke, Robert AU - Grahl, Miranda AU - Hotho, Andreas AU - Krause, Beate AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Alani, Harith A2 - Noy, Natasha A2 - Stumme, Gerd A2 - Mika, Peter A2 - Sure, York A2 - Vrandecic, Denny T1 - Organizing Publications and Bookmarks in BibSonomy T2 - Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007 PB - C1 - Banff, Canada PY - 2007/ CY - VL - IS - SP - EP - UR - http://www2007.org/workshops/paper_25.pdf DO - KW - 2007 KW - Antrag KW - BibSonomy KW - Literaturliste KW - bibsonomy KW - challenge KW - dfg KW - itegpub KW - l3s KW - organizing KW - tagorapub L1 - SN - N1 - Antrag dfg Literatur N1 - AB - ER - TY - CONF AU - Jäschke, Robert AU - Grahl, Miranda AU - Hotho, Andreas AU - Krause, Beate AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Alani, Harith A2 - Noy, Natasha A2 - Stumme, Gerd A2 - Mika, Peter A2 - Sure, York A2 - Vrandecic, Denny T1 - Organizing Publications and Bookmarks in BibSonomy T2 - Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007 PB - C1 - Banff, Canada PY - 2007/ CY - VL - IS - SP - EP - UR - http://www2007.org/workshops/paper_25.pdf DO - KW - 2007 KW - BibSonomy KW - bibsonomy KW - challenge KW - itegpub KW - l3s KW - myown KW - organizing KW - tagorapub L1 - SN - N1 - N1 - AB - ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - de Moor, Aldo A2 - Polovina, Simon A2 - Delugach, Harry T1 - BibSonomy: A Social Bookmark and Publication Sharing System T2 - Proceedings of the First Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures PB - Aalborg Universitetsforlag C1 - Aalborg PY - 2006/ CY - VL - IS - SP - 87 EP - 102 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006bibsonomy.pdf DO - KW - 2006 KW - bookmarking KW - social KW - nepomuk KW - bibsonomy KW - OntologyHandbook KW - FCA KW - folksonomy KW - tagorapub KW - iccs KW - l3s L1 - SN - 87-7307-769-0 N1 - N1 - AB - Social bookmark tools are rapidly emerging on the Web. In suchsystems users are setting up lightweight conceptual structurescalled folksonomies. The reason for their immediate success is thefact that no specific skills are needed for participating. In thispaper we specify a formal model for folksonomies and briefly describe our own system BibSonomy, which allows for sharing both bookmarksand publication references in a kind of personal library. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - de Moor, Aldo A2 - Polovina, Simon A2 - Delugach, Harry T1 - BibSonomy: A Social Bookmark and Publication Sharing System T2 - Proceedings of the First Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures PB - Aalborg Universitetsforlag C1 - Aalborg PY - 2006/ CY - VL - IS - SP - 87 EP - 102 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006bibsonomy.pdf DO - KW - 2006 KW - FCA KW - OntologyHandbook KW - bibsonomy KW - bookmarking KW - folksonomy KW - iccs KW - l3s KW - myown KW - nepomuk KW - social KW - tagorapub L1 - SN - 87-7307-769-0 N1 - Publications of Gerd Stumme N1 - AB - 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. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Hochberger, Christian A2 - Liskowsky, Rüdiger T1 - Emergent Semantics in BibSonomy T2 - Informatik 2006 -- Informatik für Menschen. Band 2 PB - Gesellschaft für Informatik C1 - Bonn PY - 2006/october CY - VL - P-94 IS - SP - EP - UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006emergent.pdf DO - KW - 2006 KW - UniK KW - bibsonomy KW - emergence KW - emergent KW - emergentsemantics_evidence KW - folksonomy KW - hotho KW - itegpub KW - jaeschke KW - l3s KW - myown KW - nepomuk KW - ol_web2.0 KW - schmitz KW - semantics KW - stumme KW - tagorapub L1 - SN - N1 - N1 - AB - Social bookmark tools are rapidly emerging on the Web. In suchsystems users are setting up lightweight conceptual structurescalled folksonomies. The reason for their immediate success is thefact that no specific skills are needed for participating. In thispaper we specify a formal model for folksonomies, briefly describeour own system BibSonomy, which allows for sharing both bookmarks andpublication references, and discuss first steps towards emergent semantics. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Hochberger, Christian A2 - Liskowsky, Rüdiger T1 - Emergent Semantics in BibSonomy T2 - Informatik 2006 -- Informatik für Menschen. Band 2 PB - Gesellschaft für Informatik C1 - Bonn PY - 2006/october CY - VL - P-94 IS - SP - EP - UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006emergent.pdf DO - KW - 2006 KW - UniK KW - bibsonomy KW - emergence KW - emergent KW - folksonomy KW - hotho KW - itegpub KW - jaeschke KW - l3s KW - nepomuk KW - schmitz KW - semantics KW - stumme KW - tagorapub KW - ol_web2.0 KW - emergentsemantics_evidence L1 - SN - N1 - N1 - AB - Social bookmark tools are rapidly emerging on the Web. In suchsystems users are setting up lightweight conceptual structurescalled folksonomies. The reason for their immediate success is thefact that no specific skills are needed for participating. In thispaper we specify a formal model for folksonomies, briefly describeour own system BibSonomy, which allows for sharing both bookmarks andpublication references, and discuss first steps towards emergent semantics. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Hochberger, Christian A2 - Liskowsky, Rüdiger T1 - Emergent Semantics in BibSonomy T2 - Informatik 2006 -- Informatik für Menschen. Band 2 PB - Gesellschaft für Informatik C1 - Bonn PY - 2006/october CY - VL - P-94 IS - SP - EP - UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006emergent.pdf DO - KW - 2006 KW - UniK KW - bibsonomy KW - emergence KW - emergent KW - folksonomy KW - hotho KW - itegpub KW - jaeschke KW - l3s KW - myown KW - nepomuk KW - schmitz KW - semantics KW - stumme KW - tagorapub L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - 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. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Avrithis, Yannis S. A2 - Kompatsiaris, Yiannis A2 - Staab, Steffen A2 - O'Connor, Noel E. T1 - Trend Detection in Folksonomies T2 - Proc. First International Conference on Semantics And Digital Media Technology (SAMT) PB - Springer C1 - Heidelberg PY - 2006/12 CY - VL - 4306 IS - SP - 56 EP - 70 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006trend.pdf DO - KW - 2006 KW - UniK KW - detection KW - folkrank KW - folksonomy KW - hotho KW - intranet KW - itegpub KW - jaeschke KW - l3s KW - myown KW - nepomuk KW - pagerank KW - schmitz KW - stumme KW - tagorapub KW - trend KW - triadic L1 - SN - 3-540-49335-2 N1 - N1 - AB - As the number of resources on the web exceeds by far the number ofdocuments one can track, it becomes increasingly difficult to remainup to date on ones own areas of interest. The problem becomes moresevere with the increasing fraction of multimedia data, from whichit is difficult to extract some conceptual description of theircontents.One way to overcome this problem are social bookmark tools, whichare rapidly emerging on the web. In such systems, users are settingup lightweight conceptual structures called folksonomies, andovercome thus the knowledge acquisition bottleneck. As more and morepeople participate in the effort, the use of a common vocabularybecomes more and more stable. We present an approach for discoveringtopic-specific trends within folksonomies. It is based on adifferential adaptation of the PageRank algorithm to the triadichypergraph structure of a folksonomy. The approach allows for anykind of data, as it does not rely on the internal structure of thedocuments. In particular, this allows to consider different datatypes in the same analysis step. We run experiments on a large-scalereal-world snapshot of a social bookmarking system. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Avrithis, Yannis S. A2 - Kompatsiaris, Yiannis A2 - Staab, Steffen A2 - O'Connor, Noel E. T1 - Trend Detection in Folksonomies T2 - Proc. First International Conference on Semantics And Digital Media Technology (SAMT) PB - Springer C1 - Heidelberg PY - 2006/12 CY - VL - 4306 IS - SP - 56 EP - 70 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006trend.pdf DO - KW - intranet KW - 2006 KW - trend KW - pagerank KW - hotho KW - schmitz KW - jaeschke KW - l3s KW - itegpub KW - detection KW - triadic KW - stumme KW - nepomuk KW - folksonomy KW - tagorapub KW - folkrank KW - UniK L1 - SN - 3-540-49335-2 N1 - N1 - AB - As the number of resources on the web exceeds by far the number ofdocuments one can track, it becomes increasingly difficult to remainup to date on ones own areas of interest. The problem becomes moresevere with the increasing fraction of multimedia data, from whichit is difficult to extract some conceptual description of theircontents.One way to overcome this problem are social bookmark tools, whichare rapidly emerging on the web. In such systems, users are settingup lightweight conceptual structures called folksonomies, andovercome thus the knowledge acquisition bottleneck. As more and morepeople participate in the effort, the use of a common vocabularybecomes more and more stable. We present an approach for discoveringtopic-specific trends within folksonomies. It is based on adifferential adaptation of the PageRank algorithm to the triadichypergraph structure of a folksonomy. The approach allows for anykind of data, as it does not rely on the internal structure of thedocuments. In particular, this allows to consider different datatypes in the same analysis step. We run experiments on a large-scalereal-world snapshot of a social bookmarking system. ER - TY - CONF AU - Hotho, Andreas AU - Jäschke, Robert AU - Schmitz, Christoph AU - Stumme, Gerd A2 - Avrithis, Yannis S. A2 - Kompatsiaris, Yiannis A2 - Staab, Steffen A2 - O'Connor, Noel E. T1 - Trend Detection in Folksonomies T2 - Proc. First International Conference on Semantics And Digital Media Technology (SAMT) PB - Springer C1 - Heidelberg PY - 2006/12 CY - VL - 4306 IS - SP - 56 EP - 70 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006trend.pdf DO - KW - 2006 KW - UniK KW - detection KW - folkrank KW - folksonomy KW - hotho KW - intranet KW - itegpub KW - jaeschke KW - l3s KW - myown KW - nepomuk KW - pagerank KW - schmitz KW - stumme KW - tagorapub KW - trend KW - triadic L1 - SN - 3-540-49335-2 N1 - N1 - AB - As the number of resources on the web exceeds by far the number of
documents one can track, it becomes increasingly difficult to remain
up to date on ones own areas of interest. The problem becomes more
severe with the increasing fraction of multimedia data, from which
it is difficult to extract some conceptual description of their
contents.
One way to overcome this problem are social bookmark tools, which
are rapidly emerging on the web. In such systems, users are setting
up lightweight conceptual structures called folksonomies, and
overcome thus the knowledge acquisition bottleneck. As more and more
people participate in the effort, the use of a common vocabulary
becomes more and more stable. We present an approach for discovering
topic-specific trends within folksonomies. It is based on a
differential adaptation of the PageRank algorithm to the triadic
hypergraph structure of a folksonomy. The approach allows for any
kind of data, as it does not rely on the internal structure of the
documents. In particular, this allows to consider different data
types in the same analysis step. We run experiments on a large-scale
real-world snapshot of a social bookmarking system. ER -