Yen-Jen Oyang received the B.S. degree in Information Engineering from National Taiwan University in 1982, the M.S. degree in Computer Science from the California Institute of Technology in 1984, and the Ph.D. degree in Electrical Engineering from Stanford University in 1988. He is currently a Professor in the Department of Computer Science and Information Engineering, National Taiwan University. His research interests include knowledge managerment, digital library, and data mining. He can be reached at yjoyang@csie.ntu.edu.tw.