Atul Chadha

Efficient mining for association rules with relational database systems

With the tremendous growth of large scale data repositories, a need for integrating the exploratory techniques of data mining with the capabilities of relational systems to efficiently handle large volumes of data has now risen. We look at the performance of the most prevalent association rule mining algorithm-Apriori with IBMs DB2 Universal Database system. We show that a multi-column (MC) data model is preferable over the commonly used single column (SC) data model for association rule mining. We obtain factors of 4.8 to 6 improvement in performance for the MC data model over commercial implementations for the SC data model. We provide a new relational operator called Combinations, for efficient SQL implementation of Apriori in the database engine-this results in trivial parallelizability, reliability, and portability for the mining application.

CAMEL: Concept Annotated iMagE Libraries

The problem of content-based image searching has received considerable attention in the last few years. Thousands of images are now available on the Internet, and many important applications require searching of images in domains such as E-commerce, medical imaging, weather prediction, satellite imagery, and so on. Yet, content-based image querying is still largely unestablished as a mainstream field, nor is it widely used by search engines. We believe that two of the major hurdles for this poor acceptance are poor retrieval quality and usability.