1) POWELL method
POWELL法
1.
The powell method is a very effictive method to solve nonrestraint optimization problem.
Powell法历经多次修改,现公认为是解无约束优化的一种十分有效的直接法,应用及其广泛,该文将现行Powell直接法中作了进—步改进,其运算量较一般性改进方法有较大程度的降低。
2.
Based on the framework of parallel genetic algorithm(PGA),a parallel genetic-Powell-ant colony hybrid algorithm(PGPAHA) is given,in which the migration moment of sub-populations is decided according to their convergence rate,and Powell method is taken as one of operator of PGA to accelerate their convergence rate at the la.
该算法以并行遗传算法为基本框架,根据各子群体收敛速率的快慢来决定它们之间迁移的时机,在收敛后期加入Powell法作为并行遗传算法的算子来加快收敛速度,并利用蚁群优化算法提高计算的精度。
3.
Features of chaos and its applications to optimization are analyzed, and a mixed chaos optimization combining Powell method is found.
对混沌的特性及其优化应用进行了分析,建立了混沌结合传统Powell法的混合算法。
2) Powell's method
Powell法
3) Powell method
Powell方法
1.
Take Powell method as an arithmetic operator paralleled with the operators such as selection, crossover and mutation into the elementary genetic algorithm, and make use of a new anneal accurate punishment function method to deal with the restriction conditions, compile the algorithm program with MATLAB, select the maximal yi.
在气田开发规划产量构成优化模型的基础上,引入一种单目标模型的改进遗传算法,把无约束优化中的直接解法Powell方法作为一个与选择、交叉和变异平行的算子嵌入到基本遗传算法中;并利用了一种新的退火精确罚函数法处理约束条件,运用MATLAB6。
2.
Based on the Powell method and genetic algorithms, a hybrid genetic algorithm was established by setting Powell method in genetic algorithms.
把Powell方法作为一个与选择、交叉和变异平行的算子,嵌入到基本遗传算法中,在遗传算法中定义Powell算子,得到一种既有较快收敛性,又能以较大概率求得非线性约束优化问题全局最优解的混合遗传算法-Powell遗传算法。
3.
This index is minimized by Powell method, thus to make the lower bound of a robustness measurement maximized.
以闭环系统矩阵的Frobenius范数作为鲁棒性指标，运用Powell方法进行寻优，产生一种适用于工程上使用的快速而有效的直接优化方法，使系统动态矩阵保持稳定的参数摄动界最大。
4) Powell algorithm
Powell算法
1.
To train the weights of NN,it proposed a new hybrid algorithm consisting of Powell algorithm and simulated annealing algorithm with adaptive cooling schedule.
为解决非线性系统辨识和预测问题,以多层前向网络为模型框架,采用带自适应冷却进度表的模拟退火算法与Powell算法构成新型混合算法,训练网络的权值。
2.
The algorithm consists of Powell algorithm and simulated annealing algorithm with adaptive cooling schedule.
针对训练神经网络权值的BP算法容易陷于局部最小值点的问题,提出了带自适应冷却进度表的模拟退火算法与Powell算法构成新型混合算法,用该算法训练网络的权值。
3.
The non-linear least square formula for the difference of reference and sensed images is seen as the object function for Powell algorithm in which motion parameters are used as variations.
用参考图像和待配准图像构造的非线性最小二乘公式作为Powell算法的目标函数,并且以运动参数作为变量。
5) Powell search algorithm
Powell算法
1.
With modified mutual information(MI) measure,Powell search algorithm is utilized to realize mono-modality image registration.
主要改进了互信息和归一化互信息的公式,减小了互信息的计算量;改进了Powell算法,保持了原搜索方向并有效避免了局部极值;用预设旋转量的方法解决了同模态医学图像配准的局部极值问题,同时,还讨论了Powell收敛阈值对配准速度的影响。
2.
A novel algorithm that combines the global search ability of PSO algorithm and the local best result of Powell search algorithm is proposed where,after each time iterated algorithm of PSO,a Powell algorithm is used to get the best result of the current local result.
提出了一种基于粒子群算法PSO和Powell的混合优化算法,将PSO算法的全局搜索能力与Powell算法的局部寻优能力有机地结合起来。
6) Powell optimal method
Powell优化法
补充资料：Powell’s method Powell
分子式：
CAS号：
性质：法是在无约束优化算法之一，首先选取一组共轭方向，从某个初始点出发，求目标函数在这些方向上的极小值点，然后以该点为新的出发点，重复这一过程直到获得满意解，其优点是不必计算目标函数的梯度就可以在有限步内找到极值点。
CAS号：
性质：法是在无约束优化算法之一，首先选取一组共轭方向，从某个初始点出发，求目标函数在这些方向上的极小值点，然后以该点为新的出发点，重复这一过程直到获得满意解，其优点是不必计算目标函数的梯度就可以在有限步内找到极值点。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条