对其进行随机化处理，得到控制强度退化过程的随机微分方程。
A stochastic differential equation, which controls strength degradation, is obtained from the model randomized by Markov process.
本文讨论退化时滞微分方程的周期解问题。
This paper discusses the problem of periodic solution of singular differential equation with delay.
因此研究退化、脉冲时滞微分方程解的性态具有重要的现实意义。
So, it has a practical significance to study the character of solutions of either degenerate differential system with delay or impulsive differential equations with delays.
特别地，我们给出二维退化滞后微分方程的周期解的存在性问题，并在最后举例说明其应用。
Particularly, we give the problem of existence of periodic solution of two-dimensional singular differential equation with delay, and give an example to illustrate the main results of this paper.
特别地，我们给出二维退化滞后微分方程的周期解的存在性问题，并在最后举例说明其应用。
Particularly, we give the problem of existence of periodic solution of two-dimensional singular differential equation with delay, and give an example to illustrate the main results of this paper.
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