Copyright 2002 IASTED. Published in the Proceedings of Parallel and Distributed Computing and Systems (PDCS), November 4-6, 2002 in Cambridge, Massachusetts. Permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the IASTED.

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