Aiming at solving the unsafety problem of milling vertebra wall in spine stenosis surgery a spine robot system based on force feed back control strategy is introduced.

摘要针对脊柱椎管狭窄症减压手术中椎管壁磨削不安全这一问题，介绍了一种基于力反馈控制策略的脊柱外科机器人系统。

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A new way to generate stable ac current is found with feed back control system by single chip microcomputer. So a new high power ac current regulator is developed.

再用单片机组成反馈控制系统，从而找到了交流稳流的新方法，研制出一个大功率交流稳流电源。

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Moreover, PID controller was used to realize feed-back control, which could overcome the limits of direct inverse control in performance and robustness.

同时，由PID控制器构成反馈控制，克服直接逆控制鲁棒性不强的缺陷。

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Three hours later, those running the feed tweeted that they had gained back control of their account.

BBC: Hacking group Anonymous latest victim of Twitter hack