Mr. Atsuhiro Tanaka received the B.S. degree in Mathematical Engineering and Information Physics in 1990 and the M.S. degree in Information Engineering in 1992 from the University of Tokyo, respectively. He joined NEC Corporation in 1992 and has been engaged in performance design and development of large scale computer and communication systems, including clustered database systems, Web based enterprise systems, and content delivery network systems. His current research topics are information sharing systems with ad-hoc networking technologies in a rural area.