@article{ubo_mods_00196239,
  author = {Kunkel, Johannes and Ziegler, Jürgen},
  title = {A comparative study of item space visualizations for recommender systems},
  journal = {International Journal of Human Computer Studies},
  year = {2023},
  publisher = {Elsevier},
  address = {Amsterdam},
  volume = {172},
  keywords = {Empirical user studies; Information visualization; Maps; Recommender systems; Treemaps; User experience},
  issn = {1095-9300},
  doi = {10.1016/j.ijhcs.2022.102987},
  url = {https://doi.org/10.1016/j.ijhcs.2022.102987},
  language = {en}
}


@phdthesis{ubo_mods_00201681,
  author = {Stegemann, Timo},
  title = {Ein System zur Präsentation und Visualisierung von Linked Open Data in Webseiten mittels Semantic Data Widgets},
  year = {2022},
  address = {Duisburg, Essen},
  keywords = {Linked Data},
  abstract = {The amount of publicly available linked data has been growing steadily since the beginning of the Semantic Web at the start of the 21st century. With over 200 billion relations, the Linked Open Data Cloud, in which various data sets are gleaned, comprises an inconceivable treasure trove of knowledge that can be freely accessed by every Internet user. However, even though this data is "public" and "free", this does not mean that it can also be used by everyone. The enormous complexity of the technologies, applications and formats required for using this data, prevents the majority of Internet users from participating in this knowledge. This dissertation addresses the aforementioned problem and describes the Semwidg tool suite. Its goal is to provide easy access to this data, at least for users with knowledge of web technologies but without expertise in Linked Data, and thus to promote multiple use (Content-Syndication) of Linked Data content. Semwidg is a system for presenting and visualizing Linked Open Data in web pages using Semantic Data Widgets. These widgets encapsulate database queries and presentation-relevant information needed to retrieve data from the Linked Open Data Cloud, process it, and then display it within web pages. Semwidg consists of the three subcomponents SemwidgQL, SemwidgJS and SemwidgED. SemwidgQL is an easy-to-learn path query language that is adapted to the background knowledge of web developers and programmers in terms of its syntax and semantics. It can be transcompiled on the client-side into SPARQL, the de facto standard query language of Linked Data content. Based on two studies, it has been shown that SemwidgQL is easier to learn than SPARQL and can be used effectively and efficiently. SemwidgJS is a JavaScript widget library for presenting and visualizing Linked Data in web pages. It provides the usual web UI elements for output and input, as well as charts and maps, through a set of predefined widget classes. The widgets can exchange data with each other, allowing interactive web pages to be created. Furthermore, SemwidgJS is a framework that allows to define custom widget classes with just a few lines of JavaScript code. SemwidgED is an online WYSIWYG editor that supports users in embedding SemwidgJS widgets in web pages and formulating SemwidgQL queries. The usability of SemwidgED was evaluated in an empirical user study with respect to effectiveness, efficiency and user satisfaction. SemwidgED achieved very good results within the relevant target group.},
  school = {University of Duisburg-Essen},
  doi = {10.17185/duepublico/77037},
  url = {https://doi.org/10.17185/duepublico/77037},
  language = {de}
}


@inproceedings{ubo_mods_00111873,
  author = {Stegemann, Timo and Ziegler, Jürgen},
  editor = {Nikitina, Nadeschda and Song, Dezhao},
  title = {Pattern-based analysis of SPARQL queries from the LSQ dataset},
  booktitle = {Proceedings of the ISWC 2017 Posters & Demonstrations and Industry Tracks},
  series = {CEUR Workshop Proceedings},
  year = {2017},
  publisher = {CEUR-WS},
  address = {Aachen},
  volume = {1963},
  issn = {1613-0073},
  url = {http://ceur-ws.org/Vol-1963/paper542.pdf}
}


@inproceedings{Stegemann2017,
  author = {Stegemann, Timo and Ziegler, Jürgen},
  editor = {d’Amato, Claudia and Fernandez, Miriam and Tamma, Valentina and Lecue, Freddy and Cudré-Mauroux, Philippe and Sequeda, Juan and Lange, Christoph and Heflin, Jeff},
  title = {Investigating Learnability, User Performance, and Preferences of the Path Query Language SemwidgQL Compared to SPARQL},
  booktitle = {The Semantic Web – ISWC 2017: 16th International Semantic Web Conference, Vienna, Austria, October 21–25, 2017, Proceedings, Part I},
  year = {2017},
  publisher = {Springer International Publishing},
  address = {Cham},
  pages = {611–627},
  abstract = {In this paper, we present an empirical comparison of user performance and perceived usability for Sparql versus SemwidgQL, a path-oriented Rdf query language. We developed SemwidgQL to facilitate the formulation of Rdf queries and to enable non-specialist developers and web authors to integrate Linked Data and other semantic data sources into standard web applications. We performed a user study in which participants wrote a set of queries in both languages. We measured both objective performance as well as subjective responses to a set of questionnaire items. Results indicate that SemwidgQL is easier to learn, more efficient, and preferred by learners. To assess the applicability of SemwidgQL in real applications, we analyzed its expressiveness based on a large corpus of observed Sparql queries, showing that the language covers more than 90% of the typical queries performed on Linked Data.},
  isbn = {978-3-319-68288-4},
  doi = {10.1007/978-3-319-68288-4_36},
  url = {https://doi.org/10.1007/978-3-319-68288-4_36}
}


@inproceedings{ubo:69423,
  author = {Gaulke, Werner and Ziegler, Jürgen},
  chapter = {},
  title = {Rule-enhanced task models for increased expressiveness and compactness},
  year = {2016},
  edition = {EICS ’16},
  publisher = {ACM},
  address = {Brussels, Belgium},
  pages = {4–15},
  isbn = {978-1-4503-4322-0},
  doi = {10.1145/2933242.2933243},
  abstract = {User centered design and development of interactive systems utilizes theoretically well-grounded, yet practical ways to capture user’s goals and intentions. Task models are an established approach to break down a central objective into a set of hierarchical organized tasks. While task models achieve to provide a good overview of the overall system, they often lack detail necessary to (semi-) automatically generate user interfaces. Based on requirements derived from a comprehensive overview of existing task model extensions, improvements and development methods, an approach that integrates logical rules with task models is introduced. By means of practical examples it is shown, that the integration of rules enables advanced execution flows as well as leaner task models thus improving their practical value.},
  booktitle = {Proceedings of the 8th ACM SIGCHI Symposium on Engineering Interactive Computing Systems}
}


@inproceedings{Stegemann14,
  author = {Stegemann, Timo and Ziegler, Jürgen},
  title = {SemwidgJS: A Semantic Widget Library for the Rapid Development of User Interfaces for Linked Open Data},
  booktitle = {44. Jahrestagung der Gesellschaft für Informatik, Informatik 2014, Big Data - Komplexität meistern, 22.-26. September 2014 in Stuttgart, Deutschland},
  year = {2014},
  pages = {479–490},
  bibsource = {dblp computer science bibliography, http://dblp.org},
  biburl = {http://dblp.dagstuhl.de/rec/bib/conf/gi/StegemannZ14},
  timestamp = {Tue, 15 Mar 2016 10:32:20 +0100},
  url = {http://subs.emis.de/LNI/Proceedings/Proceedings232/article93.html},
  editor = {Plödereder, Erhard and Grunske, Lars and Schneider, Eric and Ull, Dominik},
  series = {LNI},
  volume = {232},
  publisher = {GI},
  isbn = {978-3-88579-626-8}
}


@phdtheisis{ubo:49563,
  author = {Lohmann, Steffen},
  title = {Conceptualization and Visualization of Tagging and Folksonomies},
  year = {2014},
  address = {Duisburg, Essen},
  abstract = {Tagging ist im vergangenen Jahrzehnt zu einer beliebten Methode für die Indexierung von Inhalten in interaktiven Systemen geworden. Es bietet Nutzern eine einfache und effektive Möglichkeit, immer größere Mengen digitaler Informationen für sich selbst und/oder andere zu organisieren. Das durch Tagging entstehende Vokabular wird als Folksonomie bezeichnet und kann die Suche und Erschließung von digitalen Inhalten hilfreich unterstützen.
 Obwohl mehrere Modelle und Repräsentationen für Tagging vorgeschlagen wurden, gibt es bislang keine umfassende Beschreibung der Konzepte und Beziehungen des Themengebiets. Zudem existiert wenig systematische Forschung im Bereich der Visualisierung von Folksonomien, so dass diese hauptsächlich in Form einfacher Wortwolken dargestellt werden. Beide Probleme bedingen sich gegenseitig, da eine präzise und konsistente Konzeptualisierung wichtige Voraussetzung für die interoperable Nutzung und Visualisierung von Folksonomien ist.
 Diese Dissertation setzt sich mit den genannten Problemen auseinander, indem sie eine umfassende Konzeptualisierung für Tagging und Visualisierungen für die interaktive Analyse von Folksonomien entwickelt. Zunächst wird ein Überblick über Tagging-Modelle gegeben und werden wichtige Begriffe des Themengebiets definiert. Nach einer sorgfältigen Analyse vorhandener Tagging-Ontologien wird eine konsistente und wohldefinierte Konzeptualisierung präsentiert, die kompatible Teilbereiche der betrachteten Ontologien aufgreift und vereint. Die Konzeptualisierung ist in einer standardisierten Ontologiebeschreibungssprache implementiert und ermöglicht die Nutzung skalierbarer Reasoning-Verfahren auf Folksonomien.
 Ausgehend von der Konzeptualisierung untersucht die Dissertation anschließend verschiedene Darstellungsformen für Wortwolken und wie sie Nutzer bei der Informationssuche unterstützen. Es werden visuelle und interaktive Erweiterungen für Wortwolken entwickelt und zu einem Analysesystem integriert, das mit maschineller Sprachverarbeitung und intuitiven Interaktionstechniken ausgestattet ist. Darüber hinaus werden vorhandene Umsetzungen der Darstellung von Folksonomien als Graphen analysisiert und schließlich eine neuartige Graphvisualisierung präsentiert, die die tag-basierte Erschließung von digitalen Inhalten ermöglicht.
 Die entwickelten Ansätze wurden erfolgreich in verschiedenen Kontexten angewandt. Die Konzeptualisierung kam im Wissens- und Anforderungsmanagement zum Einsatz, die erweiterten Wortwolken halfen bei der visuellen Textanalyse und die neuartige Graphvisualisierung fand in der Bildersuche und Anforderungsanalyse Anwendung. Die Beispiele zeigen die vielfältigen Verwendungsmöglichkeiten der entwickelten Ansätze über das Themengebiet Tagging hinaus und führen zu interessanten Fragestellungen für zukünftige Forschung.},
  note = {Duisburg, Essen, Univ., Diss., 2013},
  url = {http://duepublico.uni-duisburg-essen.de/servlets/DocumentServlet?id=35802},
  school = {University of Duisburg-Essen}
}


@inproceedings{ubo:48985,
  author = {Gaulke, Werner and Ziegler, Jürgen},
  editor = {Butz, Andreas and Koch, Michael and Schlichter, Johann},
  chapter = {},
  title = {Entwicklung semantischer Produktdatenmodelle durch Domänenexperten: Fehleranalyse und Werkzeugunterstützung},
  year = {2014},
  publisher = {De Gruyter Oldenbourg},
  address = {Berlin},
  isbn = {978-3-110-34448-6},
  url = {http://dl.mensch-und-computer.de/handle/123456789/3801},
  abstract = {Semantisch modellierte Daten in Form von Ontologien bilden eine Grundlage für unterschiedlichste intelligente Funktionen, insbesondere ermöglichen sie eine verbesserte Unterstützung bei der Suche und Filterung von Information. Dies gilt auch im Bereich des Electronic Commerce, wo semantische Produktdatenmodelle eine zunehmende Rolle spielen. Typischerweise werden diese Modelle aber von Domänenexperten erstellt, die mit semantischen Modellierungstechniken nicht oder nur wenig vertraut sind. Dieser Beitrag stellt einen auf die E-Commerce-Domäne zugeschnittenen Editor vor, der nicht-technische Benutzer dabei unterstützt, formal und fachlich korrekte Modelle zu erstellen. Auf Grundlage einer erstellten Fehlerklassifizierung wird dieser Editor empirisch mit einer generischen Modellierungs-methode verglichen. Die Ergebnisse zeigen einerseits einen Vorteil des domänenspezifischen Werkzeugs, andererseits werden aus einer Fehleranalyse Gestaltungsvorschläge zur weiteren Optimierung domänenspezifischer Modellierungswerkzeuge abgeleitet.},
  booktitle = {Mensch und Computer 2014 - Tagungsband: 14. fachübergreifende Konferenz für interaktive und kooperative Medien ; Interaktiv unterwegs, Freiräume gestalten}
}


@book{ubo:42843,
  editor = {Hussein, Tim and Paulheim, Heiko and Lukosch, Stephan and Ziegler, Jürgen and Calvary, Gaelle},
  title = {Semantic Models for Adaptive Interactive Systems},
  series = {Human–Computer Interaction Series},
  year = {2013},
  publisher = {Springer},
  address = {London [u.a.]},
  abstract = {Providing insights into methodologies for designing adaptive systems based on semantic data, and introducing semantic models that can be used for building interactive systems, this book showcases many of the applications made possible by the use of semantic models.
 Ontologies may enhance the functional coverage of an interactive system as well as its visualization and interaction capabilities in various ways. Semantic models can also contribute to bridging gaps; for example, between user models, context-aware interfaces, and model-driven UI generation. There is considerable potential for using semantic models as a basis for adaptive interactive systems. A variety of reasoning and machine learning techniques exist that can be employed to achieve adaptive system behavior. The advent and rapid growth of Linked Open Data as a large-scale collection of semantic data has also paved the way for a new breed of intelligent, knowledge-intensive applications.
 Semantic Models for Adaptive Interactive Systems includes ten complementary chapters written by experts from both industry and academia. Rounded off by a number of case studies in real world application domains, this book will serve as a valuable reference for researchers and practitioners exploring the use of semantic models within HCI.},
  isbn = {978-1-4471-5301-6},
  url = {http://dx.doi.org/10.1007/978-1-4471-5301-6}
}


@inproceedings{ubo:42844,
  author = {Hussein, Tim and Linder, Timm and Ziegler, Jürgen},
  editor = {Hussein, Tim and Paulheim, Heiko and Lukosch, Stephan and Ziegler, Jürgen and Calvary, Gaelle},
  chapter = {},
  title = {A Context-Aware Shopping Portal Based on Semantic Models},
  series = {Human-Computer Interaction Series},
  year = {2013},
  publisher = {Springer},
  address = {London},
  abstract = {This chapter illustrates how semantic models can be used as a backend data source for both exploration and adaptation purposes. For a fictitious shopping portal, we implemented a faceted navigation approach that provides means for exploring the portal’s content manually. In addition to that, we implemented an adaptation mechanism based on spreading activation that also exploits the semantic structure of the underlying data.},
  isbn = {978-1-4471-5301-6},
  url = {http://dx.doi.org/10.1007/978-1-4471-5301-6_8},
  booktitle = {Semantic Models for Adaptive Interactive Systems}
}


@inproceedings{ubo:36047,
  author = {Stegemann, Timo and Ziegler, Jürgen and Hussein, Tim and Gaulke, Werner},
  chapter = {},
  title = {Interactive Construction of Semantic Widgets  for Visualizing Semantic Web Data},
  year = {2012},
  publisher = {ACM New York, NY, USA},
  abstract = {The rapidly growing amount of semantically represented data on the Web creates the need for more intuitive methods and tools to interact with these data and to use them in standard Web applications. We present a method how users can interactively define personalized views of large semantic data spaces. Specifically, we propose X3S as a technique and format for specifying ‘semantic widgets’ that integrate querying and filtering of semantic data with defining their layout and presentation style. In addition, an editor has been developed that allows to create X3S templates in a direct manipulation style. The editor and the underlying format are evaluated against existing approaches by comparing their functional capabilities as well as in an initial user study.},
  isbn = {978-1-4503-1168-7},
  url = {http://doi.acm.org/10.1145/2305484.2305510},
  booktitle = {Proceedings of the 4th ACM SIGCHI Symposium on Engineering Interactive Computing Systems}
}


@inproceedings{ubo:32508,
  author = {Stegemann, Timo and Hussein, Tim and Gaulke, Werner and Ziegler, Jürgen},
  chapter = {},
  title = {X3S: Eine Spezifikation zur Darstellung und interaktiven Exploration semantischer Daten},
  year = {2011},
  abstract = {Die zunehmenden Wandlung des Internets von einem dokumentenzentrierten hin zu einem datenorientierten Netz eröffnet für Nutzer wie Entwickler eine Fülle an Möglichkeiten. Allerdings stoßen traditionelle Ansätze des Web Engineerings bei der Fülle und Heterogenität der Daten häufig an ihre Grenzen. In diesem Beitrag wird mit X3S eine Spezifikation zur Filterung sowie zur Darstellung semantischer Inhalte des Daten-Webs vorgestellt, der das Anlegen und Wiederverwenden von Bausteinen zur Datenexploration und -visualisierung ermöglicht.},
  url = {http://duepublico.uni-duisburg-essen.de/servlets/DocumentServlet?id=26874},
  booktitle = {IVDW ’11: Interaktion und Visualisierung im Daten-Web}
}


@inproceedings{ubo:32506,
  author = {Stegemann, Timo and Hussein, Tim and Gaulke, Werner and Ziegler, Jürgen},
  editor = {Diaz, Paloma and Hussein, Tim and Lohmann, Steffen and Ziegler, Jürgen},
  chapter = {},
  title = {Interacting with semantic data by using X3S},
  year = {2011},
  url = {http://duepublico.uni-duisburg-essen.de/servlets/DocumentServlet?id=26869},
  booktitle = {Proceedings of the 1st Workshop on Data-Centric Interactions on the Web}
}


@inproceedings{ubo:60527,
  author = {Heim, Philipp and Lohmann, Steffen and Stegemann, Timo},
  chapter = {},
  title = {Interactive Relationship Discovery via the Semantic Web},
  series = {Lecture Notes in Computer Science},
  year = {2010},
  publisher = {Springer-Verlag Berlin Heidelberg},
  address = {Berlin [u.a.]},
  volume = {6088},
  pages = {303–317},
  isbn = {978-3-642-13485-2},
  doi = {10.1007/978-3-642-13486-9_21},
  booktitle = {The Semantic Web: Research and Applications: 7th Extended Semantic Web Conference, ESWC 2010, Heraklion, Crete, Greece, May 30 –June 3, 2010, Proceedings, Part I}
}


@inproceedings{ubo:26021,
  author = {Lohmann, Steffen and Heim, Philipp and Stegemann, Timo and Ziegler, Jürgen},
  chapter = {},
  title = {The RelFinder User Interface: Interactive Exploration of Relationships between Objects of Interest},
  year = {2010},
  publisher = {ACM},
  address = {New York, NY},
  abstract = {Being aware of the relationships that exist between objects of interest is crucial in many situations. The RelFinder user interface helps to get an overview: Even large amounts of relationships can be visualized, filtered, and analyzed by the user. Common concepts of knowledge representation are exploited in order to support interactive exploration both on the level of global filters and single relationships. The RelFinder is easy-to-use and works on every RDF knowledge base that provides standardized SPARQL access.},
  isbn = {978-1-60558-515-4},
  booktitle = {Proceedings of the 14th International Conference on Intelligent User Interfaces (IUI 2010)}
}


@inproceedings{ubo:25078,
  author = {Heim, Philipp and Ertl, Thomas and Ziegler, Jürgen},
  chapter = {},
  title = {Facet Graphs: Complex semantic querying made easy},
  year = {2010},
  publisher = {Springer},
  address = {Berlin},
  booktitle = {Proceedings ESWC 2010 - 7th Extended Semantic Web Conference}
}


@inproceedings{ubo:22920,
  author = {Heim, Philipp and Lohmann, Steffen},
  editor = {Tochtermann, Klaus and Maurer, Hermann},
  chapter = {},
  title = {ChainGraph: A New Approach to Visualize Shared Properties in Resource Collections},
  year = {2009},
  publisher = {J.UCS},
  address = {Graz},
  url = {http://i-know.tugraz.at/2009/papers/chaingraph_visualize_shared_properties.pdf},
  booktitle = {Proceedings of the 9th International Conference on Knowledge Management and Knowledge Technologies (I-KNOW 09)}
}


@inproceedings{ubo:23495,
  author = {Heim, Philipp and Hellmann, Sebastian and Lehmann, Jens and Lohmann, Steffen and Stegemann, Timo},
  editor = {Chua, Tat-Seng and Kompatsiaris, Yiannis and Mérialdo, Bernard and Haas, Werner and Thallinger, Georg and Bailer, Werner},
  chapter = {},
  title = {RelFinder: Revealing Relationships in RDF Knowledge Bases},
  year = {2009},
  publisher = {Springer},
  address = {Berlin/Heidelberg},
  isbn = {978-3-642-10542-5},
  url = {http://www.uni-due.de/ s400268/RelFinder-SAMT09.pdf},
  booktitle = {Semantic Multimedia - Proceedings of the 4th International Conference on Semantic and Digital Media Technologies}
}


@incollection{ubo_mods_00022922,
  author = {Heim, Philipp and Stegemann, Timo and Lohmann, Steffen and Ziegler, Jürgen},
  editor = {Wandke, Hartmut and Kain, Saskia and Struve, Doreen},
  title = {Semantisch unterstützte Informationsextraktion aus Dokumentenmengen},
  booktitle = {Mensch & Computer 2009},
  year = {2009},
  publisher = {Oldenbourg},
  address = {München},
  pages = {415–418},
  isbn = {978-3-486-59222-1}
}


@inproceedings{ubo:22925,
  author = {Heim, Philipp and Stegemann, Timo and Lohmann, Steffen and Ziegler, Jürgen and Cyriaks, Haiko and Stolz, Horst},
  editor = {Auer, Sören and Lauenroth, Kim and Lohmann, Steffen and Riechert, Thomas},
  chapter = {},
  title = {InteractiveExtractor: Durchgängige Unterstützung bei der Extraktion von anforderungsrelevanten Informationen},
  year = {2009},
  address = {Leipzig},
  isbn = {978-3-941608-05-4},
  booktitle = {Agiles Requirements Engineering: für Softwareprojekte mit einer großen Anzahl verteilter Stakeholder}
}


@inproceedings{ubo:23494,
  author = {Lohmann, Steffen and Heim, Philipp and Tetzlaff, Lena and Ertl, Thomas and Ziegler, Jürgen},
  editor = {Chua, Tat-Seng and Kompatsiaris, Yiannis and Mérialdo, Bernard and Haas, Werner and Thallinger, Georg and Bailer, Werner},
  chapter = {},
  title = {Exploring Relationships between Annotated Images with the ChainGraph Visualization},
  year = {2009},
  publisher = {Springer},
  address = {Berlin/Heidelberg},
  abstract = {Understanding relationships and commonalities between digital contents based on metadata is a difficult user task that requires sophisticated presentation forms. In this paper, we describe an advanced graph visualization that supports users with these activities. It reduces several problems of common graph visualizations and provides a specific chain arrangement of nodes that facilitates visual tracking of relationships. We present a concrete implementation for the exploration of relationships between images based on shared tags. An evaluation with a comparative user study shows good performance results on several dimensions. We therefore conclude that the ChainGraph approach can be considered a serious alternative to common graph visualizations in situations where relationships and commonalities between contents are of interest. After a discussion of the limitations, we finally point to some application scenarios and future enhancements.},
  isbn = {978-3-642-10542-5},
  url = {http://www.uni-due.de/ s400268/ImageChainGraph-SAMT09.pdf},
  booktitle = {Semantic Multimedia - Proceedings of the 4th International Conference on Semantic and Digital Media Technologies}
}


@article{ubo:23929,
  author = {Lohmann, Steffen and Heim, Philipp and Stegemann, Timo and Tetzlaff, Lena and Ziegler, Jürgen},
  title = {Entdecken und Explorieren von Zusammenhängen im Semantic Web},
  journal = {i-com - Zeitschrift für interaktive und kooperative Medien},
  year = {2009},
  volume = {8},
  number = {3},
  pages = {33–39},
  issn = {1618-162X}
}


@inproceedings{ubo:19282,
  author = {Heim, Philipp and Dalli, Deniz and Ziegler, Jürgen},
  editor = {Herczeg, Michael and Kindsmüller, Christof Martin},
  chapter = {},
  title = {ListGraph: Visuelle Analyse von RDF-Daten},
  year = {2008},
  publisher = {Oldenburg},
  address = {München},
  isbn = {978-3-486-58900-9},
  booktitle = {Mensch und Computer 2008}
}


@inproceedings{ubo:19846,
  author = {El Jerroudi, Zoulfa and Ziegler, Jürgen},
  chapter = {},
  title = {iMERGE: Interactive Ontology Merging},
  year = {2008},
  publisher = {Springer},
  address = {Acitrezza, Italy},
  abstract = {In this paper we present novel visual analytics techniques
 which help the user in the process of interactive ontology mapping and
 merging. A major contribution will be the strong integration and coupling
 of interactive visualizations with the merging process enabling the
 user to follow why concepts are merged and at which position in the
 ontology they are merged. For this purpose, adapted ontology similarity
 measures and new techniques for representing ontologies will be required
 to enable responsive, real time visualization and exploration of the comparing
 and merging results.},
  booktitle = {EKAW 2008 – 16th International Conference on Knowledge Engineering and Knowledge Management Knowledge Patterns}
}


@inproceedings{ubo:19281,
  author = {Heim, Philipp and Ziegler, Jürgen},
  editor = {Tochtermann, Klaus and Maurer, Hermann},
  chapter = {},
  title = {Handling the Complexity of RDF Data: Combining List and Graph Visualization},
  year = {2008},
  publisher = {J.UCS},
  address = {Graz},
  booktitle = {Proceedings of the 8th International Conference on Knowledge Management (I-KNOW  08)}
}


@inproceedings{ubo:19280,
  author = {Heim, Philipp and Lohmann, Steffen and Lauenroth, Kim and Ziegler, Jürgen},
  chapter = {},
  title = {Graph-based Visualization of Requirements Relationships},
  year = {2008},
  publisher = {IEEE},
  address = {Los Alamitos, CA, USA},
  abstract = {Understanding the relationships between require- ments is important in order to understand the requirements themselves. Existing requirements management tools mainly use lists, tables, trees, and matrices to visualize requirements and their interrelations. However, all these visualization forms have a limited capability to show multiple relationships of different types. In this paper, we propose to extend traditional requirements analysis and management by a graph-based visualization that allows to represent multidi- mensional relations in a direct and flexible way. In particular, we propose a special presentation form that enables the exploration of requirements along their relationships and facilitates understanding of dependencies between requirements.},
  isbn = {978-0-7695-3629-3},
  booktitle = {Proceedings of the 3rd International Workshop on Requirements Engineering Visualization (REV 08)}
}


@inproceedings{ubo:19692,
  author = {Heim, Philipp and Ziegler, Jürgen and Lohmann, Steffen},
  editor = {Auer, Sören and Dietzold, Sebastian and Lohmann, Steffen and Ziegler, Jürgen},
  chapter = {},
  title = {gFacet: A Browser for the Web of Data},
  year = {2008},
  publisher = {CEUR-WS},
  address = {Aachen},
  abstract = {This paper introduces a new approach to browsing the Web of data by combining graph-based visualization with faceted filtering techniques. The graph-based visualization of facets supports the integration of different domains and an efficient exploration of highly structured and interrelated datasets. It allows to access information from distant user-defined perspectives and thereby enables the exploration beyond the borders of Web pages.},
  url = {http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-417/paper5.pdf},
  booktitle = {Proceedings of the International Workshop on Interacting with Multimedia Content in the Social Semantic Web (IMC-SSW’08)}
}


@inproceedings{ubo:18065,
  author = {Riechert, Thomas and Lohmann, Steffen},
  editor = {Auer, Sören and Bizer, Christian and Müller, Claudia and Zhdanova, V. Anna},
  chapter = {},
  title = {Mapping Cognitive Models to Social Semantic Spaces - Collaborative Development of Project Ontologies},
  year = {2007},
  publisher = {Köllen},
  address = {Bonn},
  abstract = {In this paper, we present an approach that applies concepts from the areas of Social Software and Semantic Web to application development. We start with a short introduction into Semantic Based Requirements Engineering. Then, we present an ontology for capturing requirements and related information. Based on this ontology, we describe how stakeholders are enabled to directly participate in requirements elicitation and to collaboratively create a project ontology. Finally, we report about the application of the presented approach in a use case from the e-government domain.},
  isbn = {9783885792079},
  url = {http://ftp.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-301/Paper_8_Riechert.pdf},
  booktitle = {The Social Semantic Web 2007 - Proceedings of the 1st Conference on Social Semantic Web (CSSW)}
}


@inproceedings{ubo:14860,
  author = {Hüsken, P. and Ziegler, J.},
  chapter = {},
  title = {Visualisierung und Editieren komplexer Ontologien mit einer adaptiven Baum-Komponente},
  year = {2007},
  publisher = {Oldenbourg},
  booktitle = {7. GI-Konferenz Mensch Computer 2007}
}


@inproceedings{ubo:14858,
  author = {Lohmann, Steffen and Heim, Philipp and Ziegler, Jürgen},
  editor = {Auer, Sören and Bizer, Christian and Müller, Claudia and Zhdanova, V. Anna},
  chapter = {},
  title = {Semantic Integrator: Semi-Automatically Enhancing Social Semantic Web Environments},
  year = {2007},
  publisher = {Köllen},
  address = {Bonn},
  abstract = {Large amounts of information from various sources have often to be considered when collaboratively developing semantic structures. Examining all relevant information can be very demanding and time consuming. Thus, methods and tools are needed that assist in the integration of this heterogeneous and distributed information. Based on an approach that uses Social Software and Semantic Web technology in requirements engineering, this paper describes the general concept and architecture of the Semantic Integrator, a tool that aims at visually support the integration of distributed information into semantic structures.},
  isbn = {9783885792079},
  booktitle = {The Social Semantic Web 2007 - Proceedings of the 1st Conference on Social Semantic Web (CSSW)}
}


@article{ubo:14862,
  author = {El Jerroudi, Z. and Ziegler, J.},
  title = {Interaktives Vergleichen und Zusammenführen von Ontologien},
  journal = {i-com: Zeitschrift für interaktive und kooperative Medien},
  year = {2007},
  volume = {6},
  number = {3},
  pages = {44–49},
  abstract = {In dieser Arbeit werden semi-automatische
 Verfahren vorgestellt, die den Domänenexperten beim interaktiven
 Vergleichen und Zusammenführen von Ontologien
 unterstützen sollen. Das Ziel beim Vergleichen von zwei Ontologien
 besteht darin, eine Abbildung zwischen der Quell- und
 Zielontologie zu finden, die dem Nutzerverständnis einer semantischen
 Entsprechung am nächsten kommt. Für die Initialisierung
 des Vergleichsprozesses startet der iMERGING-Editor mit der
 linguistischen Ähnlichkeit von zwei Konzepten, danach werden
 die strukturellen Eigenschaften der Ontologie berücksichtigt
 und im dritten Schritt wird die Ähnlichkeit aufgrund zusätzlich
 vorhandener Informationen wie die Verknüpfung mit Dokumenten
 untersucht. Nutzereingaben, wie das Ablehnen oder Ändern
 eines Mappings, werden im Vergleichsprozess interaktiv berücksichtigt,
 so dass Domänenwissen des Nutzers mit einbezogen
 werden kann, um semantische Entsprechungen zwischen zwei
 Elementen der Wissensstruktur zu finden.},
  issn = {1618-162X}
}


@inproceedings{ubo:14865,
  author = {Ziegler, J. and Beinhauer, W.},
  chapter = {},
  year = {2007},
  publisher = {Oldenbourg},
  booktitle = {},
  title = {Interaktion mit komplexen Informationsräumen: Visualisierung, Multimodalität, Kooperation}
}


@inproceedings{ubo:14863,
  author = {Hüsken, P. and Ziegler, J.},
  editor = {Baranauskas, M. and Palanque, P. and Abascal, J. and Barbarosa, S.},
  chapter = {},
  title = {Degree-of-interest visualization for ontology exploration},
  year = {2007},
  publisher = {Springer},
  booktitle = {INTERACT 2007 - 11th IFIP TC13 Intl. Conf. on Human-Computer Interaction}
}


@inproceedings{ubo:14864,
  author = {Malzahn, N. and Weinbrenner, S. and Hüsken, P. and Ziegler, J. and Hoppe, H.U.},
  chapter = {},
  title = {Collaborative ontology development - Distributed architecture and visualization},
  year = {2007},
  booktitle = {GES2007: German e-Science Conference}
}


@inproceedings{ubo:18141,
  author = {Lohmann, Steffen and Ziegler, Jürgen},
  editor = {Koschke, Rainer and Otthein, Herzog and Rödiger, Karl-Heinz and Ronthaler, Marc},
  chapter = {},
  title = {Bringing Semantics into Folksonomies – Semantische Analyse nutzergenerierter Indexierungen},
  year = {2007},
  publisher = {Köllen},
  address = {Bonn},
  abstract = {Die zunehmende Popularität des gemeinschaftlichen Indexierens (Social Tagging) führt zu umfangreichen Sammlungen an nutzergenerierten Metadaten. Eine automatisierte Verwertung und interoperable Nutzung dieser Daten ist jedoch schwierig, da sie nur eine geringe formale Semantik aufweisen. In diesem Beitrag wird ein konzeptioneller Rahmen für die Abbildung von Tags auf Ontologiekon-zepte aufgestellt und anhand eines Beispielszenarios veranschaulicht},
  isbn = {9783885792061},
  booktitle = {Informatik 2007 - Informatik trifft Logistik, Band 1, Beiträge der 37. Jahrestagung der Gesellschaft für Informatik e.V.}
}


@inproceedings{ubo:14843,
  author = {Novak, J. and Fleischmann, M. and Strauss, W. and Wurst, M. and Morik, K. and Kunz, C. and Ziegler, J.},
  editor = {Ziegler, J. and Szwillus, G.},
  chapter = {},
  year = {2003},
  publisher = {Teubner},
  booktitle = {},
  title = {Verbindung heterogener Experten-Communities durch die Entdeckung, Visualisierung und Nutzbarmachung von stillem Wissen}
}


@inproceedings{ubo:14830,
  author = {Ziegler, J. and Kunz, C. and Botsch, V. and Schneeberger, J.},
  chapter = {},
  title = {Visualizing and exploring large networked information spaces with Matrix Browser},
  year = {2002},
  publisher = {IEEE Computer Society},
  booktitle = {IV 02 - 6th International Conference on Information Visualisation}
}


@inproceedings{ubo:14832,
  author = {Ziegler, J. and Kunz, C. and Botsch, V.},
  chapter = {},
  title = {Matrix Browser - Visualisierung und Exploration vernetzter Informationsräume},
  year = {2002},
  publisher = {Teubner},
  booktitle = {GI-Konferenz Mensch Computer 2002}
}


@inproceedings{ubo:14831,
  author = {Ziegler, J. and Kunz, C. and Botsch, V.},
  chapter = {},
  title = {Matrix Browser - Visualizing and exploring large networked information spaces},
  year = {2002},
  booktitle = {CHI 2002, ACM Conf. on Human Factors in Computing Systems, Extended Abstracts Minneapolis, USA April 20-25, 2002; CHI 2002, ACM Conf. on Human Factors in Computing Systems, Extended Abstracts Minneapolis, USA April 20-25, 2002}
}


@inproceedings{ubo:14823,
  author = {Rathke, C. and Wischy, M.A. and Ziegler, J.},
  editor = {Smith, M., D. Salvendy G. Harris and Koubek, R.},
  chapter = {},
  title = {Semantic lenses: exploring large information spaces more efficiently},
  year = {2001},
  publisher = {Lawrence Erlbaum},
  booktitle = {9th Int. Conf. on Human-Computer Interaction (HCI International 2001), Vol. 1: Cognitive Engineering, Intelligent Agents and Virtual Reality New Orleans, USA}
}