Dear Sir or Madam:

　　I have been engaged in researches on computer system structure and network telecommunications for over forty years. I am now president of Chongqing University. And I am very glad to recommend my student Mr. Foley Xu to you. Bore pursuing his Master Degree studies, Mr. Xu had worked for four years and accumulated considerable experience, which deeply impressed me during his postgraduate studies. Mr. Xu can apply C language skillfully in digital database and network programming. He also very familiar with DDN, Frame-relay and other network technologies. He once independently designed the Internet project of VPN (Virtual Private Network) linking up the financial institutions in Chongqing, Fuling, Wanxian and Qianjiang and displayed in his research work the professional prudence accumulated in his long years of work in the financial sector. The systems he designed were clear in logic, simple and practical in structure.

　　Mr. Xu has acquired excellent academic results. In the project "Research and Application of Bank Transaction Network Safety Model and Data-Coded Transmission System Based on Time and Space Super-Chaos Theory, he fulfilled his thesis entitled "The Analysis of Attacking against TCP Session" after consulting a great deal of data and documentation and conducting pilot programming. The thesis was published in the magazine Computer Science. On this basis he accomplished his Master Degree thesis entitled "The Detection and Dense of Attacking against TCP Session." He got unanimous good comments from the academic thesis query-and-reply committee for his profound understanding of network theory and technology as well as his clear articulation in the thesis dending his arguments. The rapid method Mr. Xu suggested for inspecting network flow volumes in his thesis embodied his active and creative thinking.

　　I believe that the telecommunications theoretical research Mr. Xu has made and the scientific research capability he has acquired during his postgraduate studies, together with his work experience, have laid a good foundation for him to pursue his doctorate studies and researches in the future. As a visiting scholar in the United States in the early 1980s, I deeply realize the necessity of learning more from the United States and other developed countries in the field of science and technology. That is why I am so glad to see aspiring and capable young people like Mr. Xu pursue their further studies abroad. I am convinced that he will dinitely accomplish his study program in your university.

　　Yours sincerely

　　Professor

　　Supervisor for Ph.D. Program

　　Chairman of the Academic Committee

　　President of Chongqing University

　　Former Cultural Councilor of Chinese Embassy to Canada

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