Both mode coupling and mode distortion in the step-index fiber are studied theoretically in order to gain the effect of mode distortion on the beam quality.

为了研究模场畸变对于大模场光纤光束质量的影响，理论研究了阶跃光纤的模式耦合和模场畸变的特性。

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The mode of the distortion of workpiece was studied. A software approach for rectifying three coordinate measuring machine data was proposed.

研究了工件的变形形式，并依此提出三坐标测量数据的软件矫正法。

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Then we calculate the Lagrangian cost to balance the rate and distortion, by which we can find the best encoding mode.

随后，通过拉格朗日优化算法，找到了平衡编码量和失真大小的宏块的最佳编码模式。

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