On May 23, 2015, cao Yu and Wang Qi participated in the doctoral thesis defense of the research group. After careful preparation, they presented and vividly explained the research background, research methods, main achievements and innovative highlights of the paper in the form of PPT, and reported their paper work. The defense shall be carried out in strict accordance with the order of the applicant introducing the content of the thesis, the committee members asking questions and the applicant's defense. In the defense, each student in the tutor carefully under the guidance of their own hard work to show the graduation thesis. All the teachers of the defense committee carefully reviewed and strictly checked the pass. After listening to each student's explanation, they reviewed and asked questions one by one in combination with the thesis statement and the actual research. The master candidates of the defense thought positively and answered the questions of the teachers carefully. In addition, the teachers also pointed out the problems and shortcomings of the thesis, and put forward valuable guidance for the future research direction of the respondent, in order to help students better understand their own thesis level, convenient for further research in this field. Finally, after closed-door discussion and secret ballot, the members of the committee fully affirmed the quality of the students' defense and the level of the thesis, they believed that cao Yu and Wang Qi's graduation thesis met all requirements, they all passed the defense and agreed to grant them the doctoral degree, congratulations!
