I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor ghi osophy.


 -f ith L. Do hai
 ofessor of Elect ical Engineering


 I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degr .of Doctor of Phphy


 rman Lam
 Associate Professor of Electrical Engineering


 I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree o octor of Philosophy.


 os rin *pe
 s s/ociate P essor of Electrical '-Engineering

 I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Phi sophy.

 Gerlard X. Ritter
 Professor of Computer and Information Sciences


 I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Docto of Philosophy.

 Ralph. Sel fgri ge
 Professor of Computer and
 Information Sciences

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