In the analysis of technology diffusion, we import classic infection model: sis model and SIR model.

在技术扩散分析中，引入经典的传染病模型：SIS模型和SIR模型。

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An epidemic SIS model whose coefficient is almost periodic functions is studied. A sufficient condition of existence and uniqueness of positive periodic solution is obtained.

对系数是概周期函数的传染病s IS模型进行了研究，得到了概周期解存在惟一的一个充分条件。

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An epidemic SIS model whose coefficient is almost periodic functions is studied. A sufficient condition of existence and uniqueness of positive periodic solution is obtained.

对系数是概周期函数的传染病s IS模型进行了研究，得到了概周期解存在惟一的一个充分条件。

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