人为构造 meaning in English

artatendon

For its close relation to cryptography , coding theory and sequences , almost difference sets have attracted many scholars " attention . firstly , davis called a special kind of divisible difference set ( dds ) almost difference set . another kind of almost difference sets was defined by ding etc . for constructing binary sequence with three - level autocorrelation
最早， davis称一类特殊的可分差集( dds )为几乎差集，而后， ding等人为构造具有优的3级自相关函数的二元序列给出了几乎差集的另一定义，并且利用分圆数构造了很多类的几乎差集。