As optimization problems exist widely in all domains of scientific research and engineering application, research on optimization methods is of great theoretical significance and practical value.
优化问题大量存在于科学研究和工程应用中的各个领域，进行最优化方法的研究具有重要的理论意义和实用价值。
SNTO method is one of practical global optimization methods because of distinctness of its principle and easy realization.
SNTO法的原理清晰，且易于实现，是一种较实用的全局优化方法。
Compared with existing spatial domain optimization methods, the new spatial spectrum optimization method can effectively improve the practical performance of DOE and save computing time.
与已有空间域优化方法的对比表明，在元件实用效果方面，空间频域优化设计方法优于空域方法。
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