Marcel Lippmann

Learn More
Ontology-based data access (OBDA) generalizes query answering in relational databases. It allows to query a database by using the language of an ontology, abstracting from the actual relations of the database. For ontologies formulated in Description Logics of the DL-Lite family, OBDA can be realized by rewriting the query into a classical first-order(More)
Formulae of linear temporal logic (LTL) can be used to specify (wanted or unwanted) properties of a dynamical system. In model checking, the system’s behavior is described by a transition system, and one needs to check whether all possible traces of this transition system satisfy the formula. In runtime verification, one observes the actual system behavior,(More)
Ontology-based data access (OBDA) generalizes query answering in relational databases. It allows to query a database<lb>by using the language of an ontology, abstracting from the actual relations of the database. OBDA can sometimes be<lb>realized by compiling the information of the ontology into the query and the database. The resulting query is(More)
In the reasoning about actions community, causal relationships have been proposed as a possible approach for solving the ramification problem, i.e., the problem of how to deal with indirect effects of actions. In this paper, we show that causal relationships can be added to action formalisms based on Description Logics (DLs) without destroying the(More)
R ecent epidemiological studies indicate that increases in human mortality [1-9) and morbidity (10-23) have been associated with levels of particulate pollution significantly lower than those previously thought to affect human health. If the evidence withstands critical evaluation, we will probably need to revise downward the National Ambient Air Quality(More)
INTRODUCTION The aim was to assess the competencies of undergraduate dental students in Germany in the domains team competence, communicative competence, learning competence and scholarship. MATERIALS AND METHODS The survey was conducted at 11 dental schools that are equally distributed all over Germany. Competencies were assessed with the Freiburg(More)
Context-aware applications try to detect specific situations within a changing environment (e.g. a computer system or air traffic observed by radar) in order to react accordingly. To gain information, the environment is observed by sensors (for a computer system, data about its resources is gathered by the operating system), and the results of sensing are(More)