School of Mathematics and Statistics;
Qinghai Normal University;
Xining 810008;
China;
Academy of Plateau Science and Sustainability;
Xining 810008;
China;
Department of Applied Mathematics;
Xi'an University of Technology;
Xi'an 710048;
China;
College of Finance;
Xingjiang University of Finance and Economics;
Urumqi 830012;
China;
Change-point monitoring; long-memory time series; ratio-type statistic; sieve bootstrap;