Dialog topic tracking aims at analyzing and maintaining topic transitions in ongoing dialogs. This paper proposes a composite kernel approach for dialog topic tracking to utilize various types of domain knowledge obtained fromWikipedia. Two kernels are defined based on history sequences and context trees constructed based on the extracted features. The experimental results show that our composi...

Using maximal consistent blocks of tolerance relation on the universe in incomplete decision table, the concepts of join block and meet block are introduced and studied. Including tolerance class, other blocks such as tolerant kernel and compatible kernel of an object are also discussed at the same time. Upper and lower approximations based on those blocks are also defined. Default definite dec...

In this dissertation, we present our efforts in developing algorithms in three related areas: 1) unified and optimal tracking, 2) improved motion compensation in cardiovascular MR, and 3) tool tracking in image-guided surgery. With the rapid advancement in the development of tracking algorithms over the years, the choice of tracking methods for a particular application has significantly increas...