To realize the best controlling for teaching system, teachers must improve their ability in collecting and dealing with information and strengthen the measures for teaching feedback.
要提高教师对反馈信息收集及处理的能力，把握加强教学反馈的措施，以实现对教学系统的最佳控制。
This paper studies the establishment of four-mirror circle feedback system and the principle of controlling contrast changes of the image pattern by this system.
本文讨论了建立四反射镜环形反馈系统的有关问题，探讨了利用环形反馈系统控制图象对比度变化的原理。
A linear state feedback controller is designed for controlling a four-dimensional chaotic system by the inverse optimal controlling approach.
采用逆最优控制方法为一种四维混沌系统设计了一个线性状态反馈控制器。
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