...M．I．A．ksun于1996年在闭型格林函数的基础上，提出了一种基于二级近似的 离散复镜像方法（DCIM，Discrete ComplexImageMemod）【l“，为进行对比，本 文将Y．L．Chow的闭型格林函数简称为单级DCIM方法，而将二级近似的离散...
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数值结果表明，二级离散复镜像方法是一种快速、有效的求解闭式格林函数的方法。
Numerical results show that the two-level DCIM is an efficient method for calculating the closed-form Green's Functions.
二级离散复镜像方法将谱域格林函数分两步近似，减少了广义函数束方法对格林函数进行指数拟合的时间。
In the two-level DCIM, the approximation is performed at two levels to reduce the time to fit the Green's functions with exponential functions so that the efficiency is improved.
该方法采用二级离散复镜像方法求解空间域的格林函数，与直接数值积分方法相比，提高了计算格林函数的速度。
The two-level discrete complex image method is used to compute the spatial Green's Function, and thus improves the speed to compute Green's function compared with the direct integral method.
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