According to the limitation of the closed control system applied by the traditional industrial robot, an open architecture welding robot based on PCI motion card is designed in this paper.

针对传统工业机器人采用封闭式控制系统的局限性，设计了一种基于PCI运动控制卡的开放式焊接机器人。

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The control scheme and operating principle of a double closed-loop AC/DC power converter system are discussed by using physics.

从物理角度讨论了双闭环交/直流功率变换器系统的控制方案和工作原理。

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The system shown in Figure 3 is that of a closed loop, with sensors feeding the control system that drive changes in the environment.

图3所示的系统是一个封闭循环，传感器负责为控制系统提供数据，而控制系统则驱动着环境中因素的变化。

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They also wanted to keep control of their fairly closed and highly regulated national financial system.

BBC: Mr Osborne and China's long road to a global currency

Even though Congress is different in this era -- with both parties deeply divided internally and a closed committee system that dampens the power of party leaders to control members -- those historical struggles offer some instructive lessons for today as to how to seize a great opportunity that emerges.

CNN: Seize the immigration deal