Singer, P.; Helic, D.; Hotho, A. & Strohmaier, M. (2015), Hyptrails: A bayesian approach for comparing hypotheses about human trails, in '24th International World Wide Web Conference (WWW2015)' , ACM, Firenze, Italy .
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Doerfel, S.; Zoller, D.; Singer, P.; Niebler, T.; Hotho, A. & Strohmaier, M. (2014), Evaluating Assumptions about Social Tagging - A Study of User Behavior
in BibSonomy, in Thomas Seidl; Marwan Hassani & Christian Beecks, ed., 'Proceedings of the 16th LWA Workshops: KDML, IR and FGWM, Aachen, Germany, September 8-10, 2014.' , CEUR-WS.org, , pp. 18--19 .
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Atzmueller, M.; Chin, A.; Helic, D. & Hotho, A., ed. (2013), 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 , Imprint: Springer , Berlin, Heidelberg .
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Mitzlaff, F.; Atzmueller, M.; Benz, D.; Hotho, A. & Stumme, G. (2013), 'User-Relatedness and Community Structure in Social Interaction Networks.', CoRR abs/1309.3888 .
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Mobasher, B.; Jannach, D.; Geyer, W.; Freyne, J.; Hotho, A.; Anand, S. S. & Guy, I., ed. (2013), 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. , Vol. 1066 , CEUR-WS.org .
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2012

Krause, B.; Lerch, H.; Hotho, A.; Roßnagel, A. & Stumme, G. (2012), 'Datenschutz im Web 2.0 am Beispiel des sozialen Tagging-Systems BibSonomy.', Informatik Spektrum 35 (1) , 12-23 .
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2011

Anagnostopoulos, A.; Brova, G. & Terzi, E. (2011), Peer and Authority Pressure in Information-Propagation Models, in 'Proceedings of the ECML/PKDD 2011' .
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2010

Benz, D.; Hotho, A.; Jäschke, R.; Krause, B.; Mitzlaff, F.; Schmitz, C. & Stumme, G. (2010), 'The Social Bookmark and Publication Management System BibSonomy', The VLDB Journal 19 (6) , 849--875 .
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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.

Hotho, A.; Benz, D.; Eisterlehner, F.; Jäschke, R.; Krause, B.; Schmitz, C. & Stumme, G. (2010), 'Publikationsmanagement mit BibSonomy -- ein Social-Bookmarking-System für Wissenschaftler', HMD -- Praxis der Wirtschaftsinformatik Heft 271 , 47-58 .
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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.

Lerch, H.; Krause, B.; Hotho, A.; Roßnagel, A. & Stumme, G. (2010), 'Social Bookmarking-Systeme – die unerkannten Datensammler - Ungewollte personenbezogene Datenverabeitung?', MultiMedia und Recht 7 , 454-458 .
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Mitzlaff, F.; Atzmüller, M.; Benz, D.; Hotho, A. & Stumme, G. (2010), Community Assessment using Evidence Networks, in 'Proceedings of the Workshop on Mining Ubiquitous and Social Environments (MUSE2010)' .
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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 bookmarking application BibSonomy. The results indicate that the evidence networks reflect the relative rating of the explicit ones very well.

2009

Atzmueller, M.; Lemmerich, F.; Krause, B. & Hotho, A. (2009), Towards Understanding Spammers - Discovering Local Patterns for Concept Characterization and Description, in Johannes Fürnkranz Arno Knobbe, ed., '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' .
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Atzmueller, M.; Lemmerich, F.; Krause, B. & Hotho, A. (2009), Who are the Spammers? Understandable Local Patterns for Concept Description, in '7th Conference on Computer Methods and Systems' .
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Benz, D.; Eisterlehner, F.; Hotho, A.; Jäschke, R.; Krause, B. & Stumme, G. (2009), Managing publications and bookmarks with BibSonomy, in Ciro Cattuto; Giancarlo Ruffo & Filippo Menczer, ed., 'HT '09: Proceedings of the 20th ACM Conference on Hypertext and Hypermedia' , ACM, New York, NY, USA , pp. 323--324 .
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Hotho, A.; Jäschke, R.; Benz, D.; Grahl, M.; Krause, B.; Schmitz, C. & Stumme, G. (2009), Social Bookmarking am Beispiel BibSonomy, in Andreas Blumauer & Tassilo Pellegrini, ed., 'Social Semantic Web' , Springer, Berlin, Heidelberg , pp. 363--391 .
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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.

Jäschke, R.; Eisterlehner, F.; Hotho, A. & Stumme, G. (2009), Testing and Evaluating Tag Recommenders in a Live System, in Dominik Benz & Frederik Janssen, ed., 'Workshop on Knowledge Discovery, Data Mining, and Machine Learning' , pp. 44 --51 .
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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.

2008

Song, Y.; Zhang, L. & Giles, C. L. (2008), A sparse gaussian processes classification framework for fast tag suggestions, in 'CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining' , ACM, New York, NY, USA , pp. 93--102 .
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2006

Turney, P. D. (2006), Expressing implicit semantic relations without supervision, in 'ACL-44: Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the Association for Computational Linguistics' , Association for Computational Linguistics, Morristown, NJ, USA , pp. 313--320 .
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