This is to certify that the Doctoral dissertation of Geoffirey J. Zhang hcis met the dissertation reqviirements of Iowa State University Major Professor For the Major Program For the Graduate College Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. iii I would like to dedicate this Ph.D. dissertation to Professor Yushi Sun. Without his valuable help I would not have been able to further my graduate studies here at Iowa State University.
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