Biographies: PIAO Yong-jie(1962-), male(chaoxianzu), native of Jiutai, Jilin, a professor of Yanbian University, Ph.D., engages in nonlinear theory and fixed point theory; JIN Zhe-zhi(1977-), male(chaoxianzu), native of Mudanjiang, Heilongjiang, a lecturer of Yanbian University, Ph.D., engages in financial mathematics