of;
Information;
and;
Communication;
Engineering;
North;
University;
of;
China;
Taiyuan,;
Shanxi;
030051,;
P.;
R.;
China;
of;
Science,;
North;
University;
of;
China;
Taiyuan,;
Shanxi;
030051,;
P.;
R.;
China;
of;
Applied;
Mathe~atics,;
Yuncheng;
University;
Yuncheng,;
Shanxi;
044000,;
P.;
R.;
China;
双重感染; 流行病模型; 稳定; 年龄; Lyapunov函数; 非线性数学; 半群理论; 艾滋病;