The join point model, the most fundamental and distinguishing concept in AOP, defines which join points in a system are exposed and how they are captured.
连接点模型是AOP中最基本和最独特的概念，它定义了系统中哪个连接点是公开的，以及如何捕获它们。
The multivariable model of the VAV system is established, which is the fundamental of the mathematical analysis of systems.
论文首先建立了变风量系统的多变量控制模型，奠定比较完整的数学分析基础。
But for a multi time scale power system, existence and fundamental characteristics of fast manifolds must also be studied in order to obtain the model reduction condition of fixing slow dynamics.
但对于多时间尺度的电力系统模型降阶问题而言，还必须研究快流形的存在性及其基本特征，以给出固定系统慢动态的降阶条件。
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