Interactive, realistic rendering of landscapes and cities differs substantially from classical terrain rendering. Due to the sheer size and detail of the data which need to be processed, realtime rendering (i.e. more than ...

In this thesis, we study the clustering of spatial data with a focus on trajectory data. Trajectory data appears in various applications. These range from the recorded positions of moving objects (e.g. animals, humans, ...

The quickly increasing number of spatio-temporal applications in fields like environmental management or geology is a new challenge to the development of database systems. This thesis addresses three areas of the problem ...

A major goal in computer graphics is the generation of photorealistic images. Nowadays, the degree of realism is often not restricted by the rendering algorithm but instead mainly depends on the quality of the virtual scene ...

In a world where the information economy is booming, poor data quality can lead to adverse consequences, including social and economical problems such as decrease in revenue. Furthermore, data-driven indus- tries are not ...

Graphs are a natural representation for diverse systems ranging from social networks to the Web and brain structure. Even when data is not interconnected explicitly, it is often convenient to convert it into a graph for ...

Acoustic distortion and acoustic mismatch are two of the most critical aspects influencing automatic speech recognition. A speech signal recorded from a speaker in a certain acoustic environment compared to a signal from ...

Tragically, gatherings of large human crowds quite often end in crowd disasters such as the recent catastrophe at the Loveparade 2010. In the past, research on pedestrian and crowd dynamics focused on simulation of pedestrian ...

The vast amount of data shared on the Web requires effective and efficient techniques to retrieve and create machine usable knowledge out of it. The creation of integrated knowledge from the Web, especially knowledge about ...

Diese Dissertation befasst sich mit Informationssystemen mit nicht vertrauenswürdiger Serverseite. Für solche Systeme bietet sich eine clientseitige Verschlüsselung ihrer Daten an, um hohe Anforderungen an deren Vertraulichkeit ......