局部极值

Downstream axially from nose apex to afterbody,a local sectional-side-force extremum always presents itself behind the forming of the corresponding shed vortex and new lee-side vortex.

沿轴向从头部尖顶往后体，截面侧向力局部极值的形成总是滞后于相应脱落涡、新生背涡的形成，截面侧向力局部极值的大小同时取决于相应脱落涡、新生背涡的形成方式和相应背涡的强度。

In order to improve the local search ability, after the chiasma operation, simulation anneal mechanism is introduced, and a new aberrance operation is used.

为提高遗传算法的局部搜索能力，在交叉操作后引入模拟退火机制，并采用一种新的变异操作，每次变异产生二个子代，然后根据情况取舍，引入接受相对差的子代的概率，这样可以一定程度上避免陷入局部极值。

Concerning the disadvantage of the original PSO that is easily trapped in the local optimization and the convergence speed is slow in the evolution later, a particle swarm collaborative optimization algorithm based on velocity angle was proposed. The strategy of inertia weight adjustment was adopted based on cumulative distribution function of Gaussian distribution.

针对PSO存在易陷入局部极值、进化后期收敛速度缓慢的缺点，提出一种基于速度夹角的粒子群协同优化算法，并且引入了一种基于高斯分布的累积分布函数的惯性权重调整策略。

In the early stage of the genetic algorithms, the three genetic mechanisms are used both in integer part and decimal part, so that the genetic algorithms have stronger global search ability, keep the population diversity efficiently and avoid falling into local extremum. In the later stage of the genetic algorithms, the three genetic operators are used in decimal part, so the genetic algorithms have stronger local search ability and fast convergence ability.

在遗传算法开始阶段，该编码算子进行整数部分和小数部分的遗传操作，使得遗传算法在早期具有很强的全局搜索能力，避免陷人局部极值；在后期进行小数部分的遗传操作，使得遗传在后期具有很强的局部搜索能力，能够很快地搜索到全局极值。

As a new optimization technique, chaos bears randomicity, ergodicity and the superiority of escaping from a local optimum.

混沌是一种新颖的优化技术，具有随机性、遍历性的特点和易跳出局部极值的能力。

Due to the existence of local extremum, such traditionalmethods could not find the global extremum properly.

通过对系列60船的优化计算，发现了有局部极值的存在，而传统优化方法只能搜索到局部极值，通常不能得到全局最优解。

The simulation result proves that the hybrid algorithm has fast convergence and the partial extremal problem can be effectively avoided.

仿真表明该混合算法收敛速度快，能有效避免局部极值问题。

In this paper, image noise and interpolations are analyzed deeply. Base on this, a new method of using low-pass filter preprocessing based on Gaussian Lowpass Filters is introduced to decrease the local extremum.

本文从图像噪声和插值技术两个方面，深入分析了局部极值产生的原因，并提出一种新的解决局部极值的方法：高斯低通滤波预处理。

In scale space,the local extremum ofwavelet transform modulo of image not only describes the local characteristics of ir-regular structure of image but also displays distribution of local singular point s.

在尺度空间，图像的小波变换模局部极值能在刻画图像不规则结构的局部特征的同时，给出它们的局部奇性点的分布。

The clone programming algorithm has the superior capability in local and global search, and local minimums are refrained efficiently; cross validation has the unbiased estimator property, and therefore, the problems such as over training or insufficient training are avoided.

克隆规划算法是具有局部、全局搜索能力的优化算法，能有效避免陷入局部极值；交叉验证算法的无偏估计性抑制了训练过程中"过拟合"和"欠拟合"。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。