James M. Ooi."November 1997."Also issued as Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of electrical Engineering and Computer Science, 1997.Includes bibliographical references (p. 181-185).Supported in part by the Advanced Research Projects Agency. N00014-93-1-0686 Supported in part by the U.S. Department of the Navy, Office of Naval Research. N00014-96-10930 Supported by an AT&Tdoctoral fellowship