Edgar-Philipp Stoffel

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This paper presents a graph-based spatial model which can serve as a reference for guiding pedestrians inside buildings. We describe a systematic approach to construct the model from geometric data. In excess of the well-known topological relations, the model accounts for two important aspects of pedestrian navigation: firstly, visibility within spatial(More)
In this article we propose a hybrid spatial model for indoor environments. The model consists of hierarchically structured graphs with typed edges and nodes. The model is hybrid in the sense that nodes and edges can be labelled with qualitative as well as quantitative information. The graphs support wayfinding and, in addition, provide helpful information(More)
In this paper we propose to apply hierarchical graphs to indoor navigation. The intended purpose is to guide humans in large public buildings and assist them in wayfinding. We start by formally defining hierarchical graphs and explaining the particular benefits of this approach. In the main part, we suggest an algorithm to automatically construct such a(More)
In this thesis, hierarchical graphs are investigated from two different angles – as a general modelling principle for (geo)spatial networks and as a practical means to enhance navigation in buildings. The topics addressed are of interest from a multi-disciplinary point of view, ranging from Computer Science in general over Artificial Intelligence and(More)
Community-based domestic violence services have grown significantly since their emergence in the 1970s. Now more than 2,000 in number, domestic violence organizations have expanded their range of programs. In addition to crisis-oriented services, such as telephone hot lines and temporary shelter, many of these agencies provide legal, health, mental health,(More)
L-DSMS is a Local Data Stream Management System. It is a Java Program which can read an XML-file with a description of a network of processing nodes for streaming data. L-DSMS automatically combines all the processing nodes into a single Java program which then processes the data. L-DSMS has a number of predefined nodes, together with an interface for(More)
This paper introduces a generic approach to integrating different kinds of geo-referenced sensor measurements along a physical infrastructure. The underlying core ontology is domain-independent and realized using Semantic Web technologies; it can be specialized for different domains. In particular, railway infrastructures are presented as a case study.(More)
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