scanning search

The simulant genetic optimization shows that the genetic drift induced by multi-parent occurrence-based scanning crossover reduces both the population diversity and the convergence rate, thus deteriorating the performance of an evolutionary search.

应用基于基因出现频率的多父代扫描交叉的仿真遗传优化实验的数据表明，重组的遗传漂移不但导致种群多样度的急剧下降，而且降低了进化搜索的收敛速度，从而降低了进化搜索的性能。

Experimental results show that genetic drift induced by occurrence-based scanning crossover reduces both convergence rate and genotypic diversity, thus causing pure performance deterioration of evolutionary search.

实验数据表明，重组的遗传漂移只会产生降低收敛速度和收敛可靠性的纯消极效果。

Thus, the search in a large file using a hash index is faster than scanning the entire file.

因此，对于较大的文件，使用hash索引进行搜索比扫描整个文件更快。