在自然界发生的基因突变、基因重组和染色体变异都是不定向变异；在人为控制下发生的变异往往是定向变异。
... other-directed受人支配的 directed variation定向变异 directed routing定向路由 ...
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... directive therapy ==> 指导疗法 directive variation ==> 定向变异 directive view receiver ==> 直观式电视接收机 ...
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... 营养缺乏症 deficiency disease 定向变异 definite variation 确定凝集反应 definitive agglutination reaction ...
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In order to overcome the problems in resolving large scale 0-1 knapsack problem with genetic algorithm,this paper introduces the directed mutation into the genetic algorithm and presents an active-evolution-based genetic algorithm(AEBGA) for the 0-1 knapsack problem.
针对遗传算法求解大规模0-1背包问题中存在的不足,将定向变异机制引入到遗传算法中,提出了基于主动进化遗传算法的0-1背包问题求解算法。
参考来源 - 求解大规模0·2,447,543篇论文数据，部分数据来源于NoteExpress
利用用户认知的不确定性设计定向变异算子。首先，采用主成分分析法辨识用户认知的不确定性；
A directional mutation operator is designed by using the user's uncertain cognitive. The main ingredient analysis is used to identify the user's uncertain cognitive.
1984年从人工病圃中选择自然变异株，经过多年连续定向筛选，于1993年育成特早熟抗病棉花新品种辽棉15号。
In 1984, natural variation plants were selected from man-made disease garden. Through directional screening the early-maturing and disease-resistant new variety-Laomian 15 came into the world in 1993.
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