切换动态系统是一类重要的混合动态系统，它是由几个连续时间子系统或离散时间子系统及作用在其中的切换规则构成的。

As an important class of hybrid dynamical systems, a switched system is composed of several continuous time subsystems or discrete time subsystems and the switching signal among them.

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以混合动态系统的外延原理为工具分析了估计器的可压缩性问题。

The extension principle for hybrid dynamic systems is introduced and the contractibility of estimator is analyzed in the framework of extension principle.

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炼钢连铸过程是一个复杂而又典型的混合动态系统，但现有的混合动态系统理论难以对此进行直接分析和综合。

However, it is very difficult to analyze and synthesize this process directly by the theory of hybrid dynamical systems.

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