Congratulations to Longwei Fang, Jinpeng Li, and Changde Du defended their dissertations to earn their doctoral degree, Jiezhen Xing defended his dissertation to earn his Master degree on May 30th, 2019. (The people in below figures are (from left to right): Jiezhen Xing, Longwei Fang, Supervisor He, Jinpeng Li, and Changde Du)