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Sep.1, 2009

To whom it may concern,

Mr. ZhangSan is a PH.D candidate in School of Electrical Engineering at Xi’an Jiaotong University. He is pursuing his doctor’s degree in Electrical Engineering and supervised by Professor WangSi. He has participated in his research program since Feb. 2009.

This letter is to certify that Mr. ZhangSan is dispatched by Graduate School of Xi’an Jiaotong University to visit University ofChicago as a PH.D student in both universities for6 months. During his stay in University ofChicago, he will acquire a grant of $4800 financed by Graduate School of Xi’an Jiaotong University. And we agree to keep his status as a graduate student of Xi’an Jiaotong University. He may continue to pursue his PH.D degree when he comes back.

Tianning CHEN, Ph.D

Professor & Deputy Dean

Graduate School

Xi’an Jiaotong University

Xi’an, 710049, P.R. China