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Most of the current methodologies for building ontologies rely on specialized knowledge engineers. This is in contrast to real-world settings, where the need for maintenance of domain specific ontologies emerges in the daily work of users. But in order to allow for participatory ontology engineering, we need to have a more realistic conceptual model of how(More)
In this paper, we present a metamodel for textual use case descriptions, structurally conforming to the UML, to specify the behavior of use cases in a flow-oriented manner. While being primarily targeted at supporting requirements engineers in creating consistent use case models, the metamodel defines a textual representation of use case behavior that is(More)
Ontology maturing as a conceptual process model is based on the assumption that ontology engineering is a continuous collaborative and informal learning process and always embedded in tasks that make use of the on-tology to be developed. For supporting ontology maturing, we need lightweight and easy-to-use tools integrating usage and construction processes(More)
The Austrian Alzheimer Society developed evidence-based guidelines based on a systematic literature search and criteria-guided assessment with subsequent transparent determination of grades of clinical recommendation. The authors evaluated currently available therapeutic approaches for the most common forms of dementia and focused on diagnosis and(More)
A study was conducted to determine whether differences in the levels of volatile fatty acids (VFAs) in anaerobic digester plants could result in variations in the indigenous methanogenic communities. Two digesters (one operated under mesophilic conditions, the other under thermophilic conditions) were monitored, and sampled at points where VFA levels were(More)
The content of image archives changes rapidly. This makes the traditional separation of ontology development and image annotation steps no longer feasible. In this paper, we present an approach, termed ImageNotion that allows for the collaborative development of domain ontologies directly by domain experts with minimal ontology experience. ImageNotion is(More)
A growing number of users in Web 2.0 based social network sites and photo sharing portals upload millions of images per day. In many cases, this leads to serious privacy threats. The images reveal not only the personal relationships and attitudes of the uploader, but of other persons displayed in the images as well. In this paper, we propose the PRIMO(More)
The ImageNotion methodology and tools [Walter and Nagypal (2007)] support collaborative ontology creation and semantic image annotation in one integrated web-based application. In previous evaluations, we received very positive feedback from our users about this visual methodology. Users found the approach understandable and useful. So far, the ImageNotion(More)