There is empirical evidence that the user interaction metaphors used in ontology engineering toolkits are largely inadequate and that novel interactive frameworks for human-ontology interaction are needed. Here we present a novel tool for visualizing and navigating ontologies, called KC-Viz, which exploits an innovative ontology summarization method to support a ’middleout ontology browsing’ ap...

Many interesting analysis problems (for example, disease surveillance) would become more tractable if their spatio-temporal structure was better understood. Specifically, it would be helpful to be able to identify autocorrelation in space and time simultaneously. Some of the most commonly used measures of spatial association are LISA statistics, such as the Local Moran’s I or the Getis-Ord Gi*,...

Frequent pattern mining plays an essential role in many data analysis tasks including association-, correlation-, and causality analysis and has broad applications. Examples are market basket analysis and web click stream analysis. Although a number of efficient methods for mining frequent patterns where proposed in the past, there exist only a small number of visual exploration tools for disco...