However, since these approaches take no account of complexity control and have no guarantee of global minimum, they often suffer from unstable performance.

但是由于这些方法不考虑复杂度的控制以及不能保证全局最小值，所以它们的性能不稳定。

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Ball and beam system is a nonlinear and unstable system, which is designed for experiments of basic control curriculum such as feedback control.

球杆系统这样一个非线性不稳定系统是为自动控制原理等基础控制课程教学实验设计的实验设备。

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But the learning period of opened-loop iterative learning control is long, and the unstable and high gain phenomena may be taken place during the initial stage of iterative learning control.

开环迭代学习控制学习周期长，在迭代学习的初期容易出现不稳定和高增益的现象。

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And a local entrepreneur says he doesn't like doing business elsewhere because areas outside Kurdish control are too unstable.

NPR: 10 Years After US Invasion, Kurds Look To The West