Learn More
In this paper, we propose a query relaxation approach to handle the problem of empty or too little answers returned from RDF query. We apply RDF entailment to triple patterns in the original query to get more general answers. We propose the notion of semantic similarity degree so that the returned answers are semantically close to the original query. We(More)
Scientists have observed the occurrence of two distinctive subsets in Interplanetary Coronal Mass Ejections (ICMEs): magnetic clouds (MCs) and non-magnetic clouds (non-MCs). While we are aware of some of the distinctive features of MCs and non-MCs, we cannot draw a precise line between them. Features such as large magnetic field, low plasma-beta, low proton(More)
Clustering is an important branch in the field of data mining as well as statistical analysis and is widely used in exploratory analysis. Many algorithms exist for clustering in the Euclidean space. However, time series clustering introduces new problems, such as inadequate distance measure, inaccurate cluster center description, lack of efficient and(More)
  • 1