| This research is supported by the NSF through grants ANI-0083074, ANI-9903427 and ANI-0508506, by DARPA through grant MDA972-99-1-0007, by AFOSR through grant MURI F49620-00-1-0330, and by grants from the California MICRO and CoRe programs, Hitachi, Hitachi America, Hitachi CRL, Hitachi SDL, DENSO IT Laboratory, NICT (National Institute of Communication Technology, Japan), Nippon Telegraph and Telephone (NTT), NTT Docomo, NS Solutions Corporation, Fujitsu and Novell. |