查询词典 mutation

According to this understanding, this thesis tries to modify PSO algorithm in order to improve its quality of solutions. The main approches include: using uniform design to ensure the uniform distribution of initial particles in the design space; adding mutation operation to increase the diversity of particles; decreasing the maximum velocity limitation and the velocity inertia automatically to balance the local and the global search efforts; developing a new approach to treat the design variables exceeding the bounds; using extensive local searches to escape local minimum. The overall effect of these approaches can yield better results for most test problems.

有鉴於此，本文针对粒子群演化法之流程参考相关文献并稍作改变，使得粒子群演算法在结果的收敛上更具优势，本文的主要改进的方法包括：应用均匀设计的概念使得初始的粒子可以更均匀地分布在空间上；利用突变增加粒子之间的差异性与多样性；利用适当控制的最大速度限制及惯性权重控制，达到区域搜寻与全域搜寻的效果；应用新的边界处理机制处理设计变数超过上、下限的问题；利用区域强化搜寻针对粒子附近地区，再作进一步的搜索以得到更佳之结果；将各种方法综合后配合粒子群演算法使用，可以得到不错的结果。

If mutation rate is not homogeneous along the genome, what is characteristic scale of this inhomogeneity?

假如突变机率在基因体中不是同质的，这个异质性的性质规模为何？

An integer coded hybrid particle swarm optimization algorithm which incorporates the crossover and mutation operators of Genetic Algorithm with basic particle swarm optimization is proposed to solve the model, and a C ++ code is programmed.

同时提出基本粒子群优化算法与遗传算法交叉、变异算子相结合的整数编码的混合粒子群优化算法来求解该选址模型，并编制了相应的C++程序。

Interbreeding and natural mutation accumulation may be major factors in genetic variation among the hybrid and parents.

自然变异的累积和天然异交可能是导致SC704及其亲本遗传变异的主要原因。

The results showed:intercomparison sequence from Exonl to part Intronl fragment amplification by primers 1 of two individual selection from each swinery with pig L-FABP gene sequence published in GenBank,found that base site of 237、258、315 of all individuals were A、T and A respectively,different with DQ182323 base sequence of G、C and C,and existence G403A mutation between individual.

结果表明：引物1扩增的外显子1到部分内含子1片段每个猪群选择两个个体经测序得到的序列与GenBank上已发表的猪(DQ182323)的L-FABP基因序列比对，发现所测所有个体237位点、258位点和315位点碱基分别为A、T和T与DQ182323序列的碱基G、C和C不同，而且所测个体间存在G403A突变。

Numerical experiments show that the updating algorithm by using intergeneration differential and chaotic mutation (algorithm 8) is a good selection. Simultaneously, the updating effect is perfect when the updated particles are about 20%.

通过数值实验得出基于代间差分和混沌变异的粒子更新算法（即算法8）是一种很好的选择，并且当性能较差的20%左右粒子按照这种算法更新时效果较好。

Based on the simulation of natural death process of 5% B-cell in biology clone selection, this paper proposes 8 kinds of updating algorithms according to intergeneration differential, theory of chaos, principle of mutation respectively, and selects the updated particles in terms of simulated annealing method.

因此模拟生物克隆选择中5%的B细胞自然消亡过程，在粒子群优化算法进化过程中分别基于代间差分、混沌理论、变异原理等方法设计了8种粒子更新算法，并按照模拟退火方法进行更新后粒子的选择。

Of or having the nature of an invocation.a mutation due to an intramolecular reorganization of a gene.

一个基因分子内部进行带基本性质的重新组合所形成的突变。

One who conveys news or information .a mutation due to an intramolecular reorganization of a gene.

一个基因分子内部进行带基本性质的重新组合所形成的突变。

A mutation due to an intramolecular reorganization of a gene .

一个基因分子内部进行带基本性质的重新组合所形成的突变。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。