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Tele-TASK is a tool for recording lectures and presentations. It does not only record the audio and video of the speaker but also everything happening on the presenter's computer. No matter if he is showing a Powerpoint presentation, a software demo or even the BIOS configuration of the computer, tele-TASK is able to record, encode and stream the whole(More)
This paper focuses on the question how students appreciate and value the possibility to query a multimedia knowledge base by entering complete questions instead of keywords. We aim at examining how far the result(s) of semantic queries are more appealing to students than those from a keyword-based search engine. In order to investigate this issue, two(More)
In this paper we present the results of an experiment made with our e-librarian service "MatES", an e-Learning tool on fractions in mathematics. MatES allows students to enter complete questions in natural language and returns semantically pertinent multimedia results which explain the answer to the users' question.The efficiency of MatES was proven by(More)
This paper describes our <i>e-librarian service</i> that understands students' complete questions in natural language and retrieves very few but pertinent <i>learning objects</i>, i.e., short multimedia documents. The system is based on three key components: the formal representation of a domain ontology, a mechanism to automatically identify learning(More)
In this paper we propose an algorithm for personalized learning based on a user's query and a repository of lecture subparts —i.e., learning objects— both are described in a subset of OWL-DL. It works in two steps. First, it retrieves lecture subparts that cover as much as possible the user's query. The solution is based on the concept covering problem for(More)
Our project is about an e-librarian service which is able to retrieve multimedia resources from a knowledge base in a more efficient way than by browsing through an index or by using a simple keyword search. The user can formulate a complete question in natural language and submit it to the semantic search engine. However, natural language is not a formal(More)
The number of digital video recordings has increased dramatically. The idea of recording lectures, speeches, and other academic events is not new. But, the accessibility and traceability of its content for further use is rather limited. Searching multimedia data, in particular audiovisual data, is still a challenging task to overcome. We describe and(More)
In this paper we describe the role of teachers in the cyber-age and how new teaching methods i n a computer-based l earning environment can foster exploratory learning. An overview of modern e-learning technologies is described and illustrated with examples. We also present our e-learning tool CHESt; an interactive expert system that answers students'(More)