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    AuthorTitleYearJournal/ProceedingsReftypeDOI/URL
    Singer, P., Helic, D., Hotho, A. & Strohmaier, M. Hyptrails: A bayesian approach for comparing hypotheses about human trails 2015 24th International World Wide Web Conference (WWW2015)  inproceedings URL 
    BibTeX:
    @inproceedings{singer2015hyptrails,
      author = {Singer, P. and Helic, D. and Hotho, A. and Strohmaier, M.},
      title = {Hyptrails: A bayesian approach for comparing hypotheses about human trails},
      booktitle = {24th International World Wide Web Conference (WWW2015)},
      publisher = {ACM},
      year = {2015},
      url = {http://www.www2015.it/documents/proceedings/proceedings/p1003.pdf}
    }
    
    Doerfel, S., Zoller, D., Singer, P., Niebler, T., Hotho, A. & Strohmaier, M. Evaluating Assumptions about Social Tagging - A Study of User Behavior in BibSonomy 2014 Proceedings of the 16th LWA Workshops: KDML, IR and FGWM, Aachen, Germany, September 8-10, 2014., pp. 18-19  inproceedings URL 
    BibTeX:
    @inproceedings{doerfel2014evaluating,
      author = {Doerfel, Stephan and Zoller, Daniel and Singer, Philipp and Niebler, Thomas and Hotho, Andreas and Strohmaier, Markus},
      title = {Evaluating Assumptions about Social Tagging - A Study of User Behavior
    in BibSonomy}, booktitle = {Proceedings of the 16th LWA Workshops: KDML, IR and FGWM, Aachen, Germany, September 8-10, 2014.}, publisher = {CEUR-WS.org}, year = {2014}, pages = {18--19}, url = {http://ceur-ws.org/Vol-1226/paper06.pdf} }
    Ubiquitous Social Media Analysis Third International Workshops, MUSE 2012, Bristol, UK, September 24, 2012, and MSM 2012, Milwaukee, WI, USA, June 25, 2012, Revised Selected Papers 2013   book URL 
    BibTeX:
    @book{atzmueller2013ubiquitous,,
      title = {Ubiquitous Social Media Analysis Third International Workshops, MUSE 2012, Bristol, UK, September 24, 2012, and MSM 2012, Milwaukee, WI, USA, June 25, 2012, Revised Selected Papers},
      publisher = {Imprint: Springer},
      year = {2013},
      url = {http://link.springer.com/book/10.1007/978-3-642-45392-2}
    }
    
    Proceedings of the Fifth ACM RecSys Workshop on Recommender Systems and the Social Web co-located with the 7th ACM Conference on Recommender Systems (RecSys 2013), Hong Kong, China, October 13, 2013. 2013
    Vol. 1066RSWeb@RecSys 
    proceedings URL 
    BibTeX:
    @proceedings{conf/recsys/2013rsweb,,
      title = {Proceedings of the Fifth ACM RecSys Workshop on Recommender Systems and the Social Web co-located with the 7th ACM Conference on Recommender Systems (RecSys 2013), Hong Kong, China, October 13, 2013.},
      booktitle = {RSWeb@RecSys},
      publisher = {CEUR-WS.org},
      year = {2013},
      volume = {1066},
      url = {http://ceur-ws.org/Vol-1066}
    }
    
    Krause, B., Lerch, H., Hotho, A., Roßnagel, A. & Stumme, G. Datenschutz im Web 2.0 am Beispiel des sozialen Tagging-Systems BibSonomy. 2012 Informatik Spektrum
    Vol. 35(1), pp. 12-23 
    article URL 
    BibTeX:
    @article{journals/insk/KrauseLHRS12,
      author = {Krause, Beate and Lerch, Hana and Hotho, Andreas and Roßnagel, Alexander and Stumme, Gerd},
      title = {Datenschutz im Web 2.0 am Beispiel des sozialen Tagging-Systems BibSonomy.},
      journal = {Informatik Spektrum},
      year = {2012},
      volume = {35},
      number = {1},
      pages = {12-23},
      url = {http://dblp.uni-trier.de/db/journals/insk/insk35.html#KrauseLHRS12}
    }
    
    Benz, D., Hotho, A., Jäschke, R., Krause, B., Mitzlaff, F., Schmitz, C. & Stumme, G. The Social Bookmark and Publication Management System BibSonomy 2010 The VLDB Journal
    Vol. 19(6), pp. 849-875 
    article DOI URL 
    Abstract: Social resource sharing systems are central elements of the Web 2.0 and use the same kind of lightweight knowledge representation, called folksonomy. Their large user communities and ever-growing networks of user-generated content have made them an attractive object of investigation for researchers from different disciplines like Social Network Analysis, Data Mining, Information Retrieval or Knowledge Discovery. In this paper, we summarize and extend our work on different aspects of this branch of Web 2.0 research, demonstrated and evaluated within our own social bookmark and publication sharing system BibSonomy, which is currently among the three most popular systems of its kind. We structure this presentation along the different interaction phases of a user with our system, coupling the relevant research questions of each phase with the corresponding implementation issues. This approach reveals in a systematic fashion important aspects and results of the broad bandwidth of folksonomy research like capturing of emergent semantics, spam detection, ranking algorithms, analogies to search engine log data, personalized tag recommendations and information extraction techniques. We conclude that when integrating a real-life application like BibSonomy into research, certain constraints have to be considered; but in general, the tight interplay between our scientific work and the running system has made BibSonomy a valuable platform for demonstrating and evaluating Web 2.0 research.
    BibTeX:
    @article{benz2010social,
      author = {Benz, Dominik and Hotho, Andreas and Jäschke, Robert and Krause, Beate and Mitzlaff, Folke and Schmitz, Christoph and Stumme, Gerd},
      title = {The Social Bookmark and Publication Management System BibSonomy},
      journal = {The VLDB Journal},
      publisher = {Springer},
      year = {2010},
      volume = {19},
      number = {6},
      pages = {849--875},
      url = {http://www.kde.cs.uni-kassel.de/pub/pdf/benz2010social.pdf},
      doi = {http://dx.doi.org/10.1007/s00778-010-0208-4}
    }
    
    Hotho, A., Benz, D., Eisterlehner, F., Jäschke, R., Krause, B., Schmitz, C. & Stumme, G. Publikationsmanagement mit BibSonomy -- ein Social-Bookmarking-System für Wissenschaftler 2010 HMD -- Praxis der Wirtschaftsinformatik
    Vol. Heft 271, pp. 47-58 
    article  
    Abstract: Kooperative Verschlagwortungs- bzw. Social-Bookmarking-Systeme wie Delicious, Mister Wong oder auch unser eigenes System BibSonomy erfreuen sich immer größerer Beliebtheit und bilden einen zentralen Bestandteil des heutigen Web 2.0. In solchen Systemen erstellen Nutzer leichtgewichtige Begriffssysteme, sogenannte Folksonomies, die die Nutzerdaten strukturieren. Die einfache Bedienbarkeit, die Allgegenwärtigkeit, die ständige Verfügbarkeit, aber auch die Möglichkeit, Gleichgesinnte spontan in solchen Systemen zu entdecken oder sie schlicht als Informationsquelle zu nutzen, sind Gründe für ihren gegenwärtigen Erfolg. Der Artikel führt den Begriff Social Bookmarking ein und diskutiert zentrale Elemente (wie Browsing und Suche) am Beispiel von BibSonomy anhand typischer Arbeitsabläufe eines Wissenschaftlers. Wir beschreiben die Architektur von BibSonomy sowie Wege der Integration und Vernetzung von BibSonomy mit Content-Management-Systemen und Webauftritten. Der Artikel schließt mit Querbezügen zu aktuellen Forschungsfragen im Bereich Social Bookmarking.
    BibTeX:
    @article{hotho2010publikationsmanagement,
      author = {Hotho, Andreas and Benz, Dominik and Eisterlehner, Folke and Jäschke, Robert and Krause, Beate and Schmitz, Christoph and Stumme, Gerd},
      title = {Publikationsmanagement mit BibSonomy -- ein Social-Bookmarking-System für Wissenschaftler},
      journal = {HMD -- Praxis der Wirtschaftsinformatik},
      year = {2010},
      volume = {Heft 271},
      pages = {47-58}
    }
    
    Lerch, H., Krause, B., Hotho, A., Roßnagel, A. & Stumme, G. Social Bookmarking-Systeme – die unerkannten Datensammler - Ungewollte personenbezogene Datenverabeitung? 2010 MultiMedia und Recht
    Vol. 7, pp. 454-458 
    article  
    BibTeX:
    @article{lerch2010datenschutz,
      author = {Lerch, Hana and Krause, Beate and Hotho, Andreas and Roßnagel, Alexander and Stumme, Gerd},
      title = {Social Bookmarking-Systeme – die unerkannten Datensammler - Ungewollte personenbezogene Datenverabeitung?},
      journal = {MultiMedia und Recht},
      year = {2010},
      volume = {7},
      pages = {454-458}
    }
    
    Mitzlaff, F., Atzmüller, M., Benz, D., Hotho, A. & Stumme, G. Community Assessment using Evidence Networks 2010 Proceedings of the Workshop on Mining Ubiquitous and Social Environments (MUSE2010)  inproceedings URL 
    Abstract: Community mining is a prominent approach for identifying (user) communities in social and ubiquitous contexts. While there are a variety of methods for community mining and detection, the effective evaluation and validation of the mined communities is usually non-trivial. Often there is no evaluation data at hand in order to validate the discovered groups. This paper proposes evidence networks using implicit information for the evaluation of communities. The presented evaluation approach is based on the idea of reconstructing existing social structures for the assessment and evaluation of a given clustering. We analyze and compare the presented evidence networks using user data from the real-world social
    okmarking application BibSonomy. The results indicate that the evidence
    tworks reflect the relative rating of the explicit ones very well.
    BibTeX:
    @inproceedings{mitzlaff2010community,
      author = {Mitzlaff, Folke and Atzmüller, Martin and Benz, Dominik and Hotho, Andreas and Stumme, Gerd},
      title = {Community Assessment using Evidence Networks},
      booktitle = {Proceedings of the Workshop on Mining Ubiquitous and Social Environments (MUSE2010)},
      year = {2010},
      url = {http://www.kde.cs.uni-kassel.de/ws/muse2010}
    }
    
    Atzmueller, M., Lemmerich, F., Krause, B. & Hotho, A. Towards Understanding Spammers - Discovering Local Patterns for Concept Characterization and Description 2009 Proc. LeGo-09: From Local Patterns to Global Models, Workshop at the 2009 European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases  inproceedings URL 
    BibTeX:
    @inproceedings{ALKH:09,
      author = {Atzmueller, Martin and Lemmerich, Florian and Krause, Beate and Hotho, Andreas},
      title = {Towards Understanding Spammers - Discovering Local Patterns for Concept Characterization and Description},
      booktitle = {Proc. LeGo-09: From Local Patterns to Global Models, Workshop at the 2009 European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases},
      year = {2009},
      note = {accepted},
      url = {http://www.ke.tu-darmstadt.de/events/LeGo-09/04-Atzmueller.pdf}
    }
    
    Atzmueller, M., Lemmerich, F., Krause, B. & Hotho, A. Who are the Spammers? Understandable Local Patterns for Concept Description 2009 7th Conference on Computer Methods and Systems  inproceedings URL 
    BibTeX:
    @inproceedings{atze09,
      author = {Atzmueller, Martin and Lemmerich, Florian and Krause, Beate and Hotho, Andreas},
      title = {Who are the Spammers? Understandable Local Patterns for Concept Description},
      booktitle = {7th Conference on Computer Methods and Systems},
      year = {2009},
      note = {ISBN 83-916420-5-4},
      url = {http://www.cms.agh.edu.pl/}
    }
    
    Benz, D., Eisterlehner, F., Hotho, A., Jäschke, R., Krause, B. & Stumme, G. Managing publications and bookmarks with BibSonomy 2009 HT '09: Proceedings of the 20th ACM Conference on Hypertext and Hypermedia, pp. 323-324  inproceedings DOI URL 
    Abstract: In this demo we present BibSonomy, a social bookmark and publication sharing system.
    BibTeX:
    @inproceedings{benz2009managing,
      author = {Benz, Dominik and Eisterlehner, Folke and Hotho, Andreas and Jäschke, Robert and Krause, Beate and Stumme, Gerd},
      title = {Managing publications and bookmarks with BibSonomy},
      booktitle = {HT '09: Proceedings of the 20th ACM Conference on Hypertext and Hypermedia},
      publisher = {ACM},
      year = {2009},
      pages = {323--324},
      url = {http://portal.acm.org/citation.cfm?doid=1557914.1557969#},
      doi = {http://dx.doi.org/10.1145/1557914.1557969}
    }
    
    Hotho, A., Jäschke, R., Benz, D., Grahl, M., Krause, B., Schmitz, C. & Stumme, G. Social Bookmarking am Beispiel BibSonomy 2009 Social Semantic Web, pp. 363-391  incollection DOI URL 
    Abstract: BibSonomy ist ein kooperatives Verschlagwortungssystem (Social Bookmarking System), betrieben vom Fachgebiet Wissensverarbeitung
    r 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.
    BibTeX:
    @incollection{hotho2008social,
      author = {Hotho, Andreas and Jäschke, Robert and Benz, Dominik and Grahl, Miranda and Krause, Beate and Schmitz, Christoph and Stumme, Gerd},
      title = {Social Bookmarking am Beispiel BibSonomy},
      booktitle = {Social Semantic Web},
      publisher = {Springer},
      year = {2009},
      pages = {363--391},
      url = {http://dx.doi.org/10.1007/978-3-540-72216-8_18},
      doi = {http://dx.doi.org/10.1007/978-3-540-72216-8}
    }
    
    Jäschke, R., Eisterlehner, F., Hotho, A. & Stumme, G. Testing and Evaluating Tag Recommenders in a Live System 2009 Workshop on Knowledge Discovery, Data Mining, and Machine Learning, pp. 44 -51  inproceedings URL 
    Abstract: The challenge to provide tag recommendations for collaborative tagging systems has attracted quite some attention of researchers lately. However, most research focused on evaluation and development 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, demonstrating the power of the framework.
    BibTeX:
    @inproceedings{jaeschke2009testingKDML,
      author = {Jäschke, Robert and Eisterlehner, Folke and Hotho, Andreas and Stumme, Gerd},
      title = {Testing and Evaluating Tag Recommenders in a Live System},
      booktitle = {Workshop on Knowledge Discovery, Data Mining, and Machine Learning},
      year = {2009},
      pages = {44 --51},
      url = {http://lwa09.informatik.tu-darmstadt.de/pub/KDML/WebHome/kdml09_R.Jaeschke_et_al.pdf}
    }
    
    Jäschke, R., Hotho, A., Schmitz, C., Ganter, B. & Stumme, G. Discovering Shared Conceptualizations in Folksonomies 2008 Web Semantics: Science, Services and Agents on the World Wide Web
    Vol. 6(1)Semantic Web and Web 2.0, pp. 38-53 
    article URL 
    Abstract: Social bookmarking tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. Unlike ontologies, shared conceptualizations are not formalized, but rather implicit. We present a new data mining task, the mining of all frequent tri-concepts, together with an efficient algorithm, for discovering these implicit shared conceptualizations. Our approach extends the data mining task of discovering all closed itemsets to three-dimensional data structures to allow for mining folksonomies. We provide a formal definition of the problem, and present an efficient algorithm for its solution. Finally, we show the applicability of our approach on three large real-world examples.
    BibTeX:
    @article{jaeschke2008discovering,
      author = {Jäschke, Robert and Hotho, Andreas and Schmitz, Christoph and Ganter, Bernhard and Stumme, Gerd},
      title = {Discovering Shared Conceptualizations in Folksonomies},
      booktitle = {Semantic Web and Web 2.0},
      journal = {Web Semantics: Science, Services and Agents on the World Wide Web},
      year = {2008},
      volume = {6},
      number = {1},
      pages = {38--53},
      url = {http://www.sciencedirect.com/science/article/B758F-4R53WD4-1/2/ae56bd6e7132074272ca2035be13781b}
    }
    
    Jäschke, R., Hotho, A., Schmitz, C. & Stumme, G. Analysis of the Publication Sharing Behaviour in BibSonomy 2007
    Vol. 4604Proceedings of the 15th International Conference on Conceptual Structures 
    inproceedings  
    Abstract: 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.
    BibTeX:
    @inproceedings{jaeschke2007analysis,
      author = {Jäschke, Robert and Hotho, Andreas and Schmitz, Christoph and Stumme, Gerd},
      title = {Analysis of the Publication Sharing Behaviour in BibSonomy},
      booktitle = {Proceedings of the 15th International Conference on Conceptual Structures},
      year = {2007},
      volume = {4604}
    }
    
    Jäschke, R., Grahl, M., Hotho, A., Krause, B., Schmitz, C. & Stumme, G. Organizing Publications and Bookmarks in BibSonomy 2007 Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007  inproceedings URL 
    BibTeX:
    @inproceedings{jaeschke07organizing,
      author = {Jäschke, Robert and Grahl, Miranda and Hotho, Andreas and Krause, Beate and Schmitz, Christoph and Stumme, Gerd},
      title = {Organizing Publications and Bookmarks in BibSonomy},
      booktitle = {Workshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007},
      year = {2007},
      url = {http://www2007.org/workshops/paper_25.pdf}
    }
    
    Hotho, A., Jäschke, R., Schmitz, C. & Stumme, G. Emergent Semantics in BibSonomy 2006
    Vol. P-94Proc. Workshop on Applications of Semantic Technologies, Informatik 2006 
    inproceedings URL 
    BibTeX:
    @inproceedings{hotho2006emergent,
      author = {Hotho, Andreas and Jäschke, Robert and Schmitz, Christoph and Stumme, Gerd},
      title = {Emergent Semantics in BibSonomy},
      booktitle = {Proc. Workshop on Applications of Semantic Technologies, Informatik 2006},
      year = {2006},
      volume = {P-94},
      url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hotho2006emergent.pdf}
    }
    
    Hotho, A., Jäschke, R., Schmitz, C. & Stumme, G. Information Retrieval in Folksonomies: Search and Ranking 2006
    Vol. 4011Proceedings of the 3rd European Semantic Web Conference , pp. 411-426 
    inproceedings URL 
    BibTeX:
    @inproceedings{hotho2006information,
      author = {Hotho, Andreas and Jäschke, Robert and Schmitz, Christoph and Stumme, Gerd},
      title = {Information Retrieval in Folksonomies: Search and Ranking},
      booktitle = {Proceedings of the 3rd European Semantic Web Conference },
      publisher = {Springer},
      year = {2006},
      volume = {4011},
      pages = {411-426},
      url = {http://www.kde.cs.uni-kassel.de/hotho/pub/2006/seach2006hotho_eswc.pdf}
    }
    
    Jäschke, R., Hotho, A., Schmitz, C. & Stumme, G. Wege zur Entdeckung von Communities in Folksonomies 2006 Proc. 18. Workshop Grundlagen von Datenbanken, pp. 80-84  inproceedings  
    BibTeX:
    @inproceedings{jaeschke06wege,
      author = {Jäschke, Robert and Hotho, Andreas and Schmitz, Christoph and Stumme, Gerd},
      title = {Wege zur Entdeckung von Communities in Folksonomies},
      booktitle = {Proc. 18. Workshop Grundlagen von Datenbanken},
      publisher = {Martin-Luther-Universität },
      year = {2006},
      pages = {80-84}
    }
    

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