The digital revolution has made digitized information easy to capture, process, store, distribute, and transmit [l]-[3j. With significant progress in computing and related technologies and their ever-expanding usage in different walks of life, huge amount of data of diverse characteristics continue to be collected and stored in databases. The rate at which such data are stored is growing phenomenally. We can draw an analogy between the popular Moore's law and the way data are increasing with the growth of information in this world of data processing applications | Brought to You by Like lhe book Buy it fiWILEY DATA MINING Multimedia Soft Computing AND Bioinformatics Su sh mi ta Mitra Tinku Acharya Data .