Authorization and access control can vary from coarse - to fine-grained.

授权和访问控制的粒度粗细不等。

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The paper states a control strategy implementing different control regulation in different phase (coarse, fine and precision tuning) for enhancing the thermal efficiency of combustion of boiler.

文中提出分阶段(粗调、细调和精调)实施不同控制规则的控制方案，用于提高锅炉燃烧的热效率。

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And the electromechanical simulation of coarse and fine tracking aiming system is done respectively which take the PID as algorithm for control, and MATLAB as tool for simulation.

引入PID控制算法，运用了MATLAB作为仿真工具，分别完成了粗精跟踪瞄准系统的机电动力学仿真。

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