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 Doctor
of Philosophy.




 Roland C. Anderson, Chairman
 Professor of Engineering 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 Doctor
of Philosophy.




 Charles E. Taylor
 Professor of Engineering 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 Doctor
of Philosophy.




 Ulrich H. Kurzweg
 Professor of Engineering 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 Doctor
of Philosophy.




 es E. Milton
 professor of Engineering Sciences