针对机械零件反求建模过程中常见二次曲面的表面重建问题，提出了曲面拟合分步计算法。

To solve the problem of quadric surface reconstruction in reverse modeling for mechanical parts, a two-step fitting algorithm was presented.

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分析了羊毛衫CAD 系统中为计算任意款式工艺单所创建的区域分步计算法的实现方法，并进行了数学论证。

Introduces the practical method about how calculating the arbitrary style with sweater CAD system, and builds the whole mathematics model on it.

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由于NLSE的复杂性，通常情况下无法求出解析解，需要利用数值计算的方法对其进行研究，其中分步傅立叶算法是应用较为广泛的一种算法。

Numerical calculation methods are usually more widely applied in NLSE because of its complexity. The most commonly used algorithm is the split-step Fourier method (SSFM).

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