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local extremum
相关语句
  局部极值
     Blind Audio Watermarking Algorithm Based on Local Extremum
     基于局部极值点的音频盲水印算法
短句来源
     Study on local extremum of object function in mutual information-based image registration
     基于互信息图像配准中的局部极值问题研究
短句来源
     The Monte Carlo searching method(Abdallah I.Husein,2001) has two shortcomings,one is that its result has random characteristic,the other is that it is inclined to fall into the local extremum in complex condition.
     基于转角随机的Monte Carlo搜索技术(Abdallah I.Husein,2001)有两点不足:(1)计算结果随机,(2)当坡体介质较为复杂时,容易陷入局部极值
短句来源
     Local Extremum Principle for Weak Solutions of a Type of Elliptic Equation under Controllable Growth Conditions
     可控增长条件下一类椭圆型方程弱解的局部极值原理
短句来源
     Algorithm for local extremum of histogram and its application in the boundary detection
     图像直方图局部极值算法及其在边界检测中的应用
短句来源
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  局部极值的
     Considering that the neural network is prone to get local extremum and its convergence speed is slow, it utilizes the excellent global searching ability of genetic algorithm to optimize the initial weights and threshold of neural network.
     针对神经网络训练速度慢、容易陷入局部极值的情况,首先利用具有良好全局搜索能力的遗传算法来优化BP神经网络的各层初始权值和阈值,为后续神经网络的搜索定位出一个优化的搜索空间。
短句来源
     Input data which are from fuzzy characteristic parameters are trained and simulated. The fault diagnosis of Fuzzy ANN is realized by the Neural Network Toolbox of MATLAB. The result is proved valid, but also proved easy to be trapped in the local extremum.
     这里以BP网络为应用模型,把模糊化后的故障特征参数作为网络的输入样本,对样本数据训练、仿真,应用MATLAB提供的神经网络工具箱函数实现了模糊神经网络对设备故障的诊断,结果证明了该诊断模型的有效性,但也暴露出BP算法易陷入局部极值的弱点。
短句来源
     Synchronously genetic algorithm which has ability of global optimize is adopted to modifiy the structure of network and eleminate rate tardiness of neural network training and relapsing into local extremum. The veracity of the model reached96.5%online in spot and can meet the need of hydro-electric simulation.
     同时采用了具有较强全局寻优能力的遗传算法在训练中修改网络结构,从而避免神经网络训练速度慢、容易陷入局部极值的缺点,在现场在线数据预测测试中准确率可达95.8%以上,可以满足仿真模型需要。
短句来源
     In order to solve the problem of local extremum encountered in the process of optimizing the complex multimodal functions, an interval decomposed optimization method is presented based on genetic algorithm (GA).
     为解决遗传算法面对复杂多模态函数优化问题时易陷入局部极值的问题,提出一种区间分解优化思想。
短句来源
     In view of the inherent disadvantage, high possibility of reaching local extremum, of the gradient-descent-based learning method, this paper presents a new hybrid learning method which combines the advantages of Genetic Algorithm (GA), Back Propagation (BP) algorithm and Least-Square Estimate (LSE).
     针对此方法基于梯度法学习易陷入局部极值的固有缺陷,本文提出了一种综合遗传算法、BP算法和最小二乘法优势的混合学习方法。
短句来源
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  “local extremum”译为未确定词的双语例句
     In order to avoid local extremum and promote convergence speed, Levenberg-Marquardt BP algorithm has been adopted.
     为了避免网络陷入局部最小点和提高网络的收敛速度,算法采用改进后的Levenberg-Marquardt 法BP 算法。
短句来源
     As the error back propagation(BP) algorithm provides a slow training and is easy to fall into local extremum,a hybrid strategy named BPSA which combines the surpervising learning property of BP with the probabilistic jumping property of simulated annealing(SA) algorithm is presented.
     针对误差反向传播(BP)算法训练速度慢和易于陷入局部最小值的缺点,利用BP算法监督学习特点,模拟退火算法(SA)在局部极小处的概率突变性,有效结合BP和SA算法,提出一种BPSA混合学习策略。
短句来源
     Experiments show that this algorithm can speed up the learning process of network,and solve the problem of local extremum in learning process to a certain extend.
     实验表明,该算法不仅能明显提高网络的学习速度,而且可较好地避免学习过程陷入局部极小点而导致学习失败。
短句来源
     Aiming at traditional BP neutral network weight algorithm’s defect such as slow convergence and easy to plunge into local extremum,an adjustable parameter feedforward neutral network and a fast algorithm to train it are proposed on the basis of weight balance algorithm.
     针对传统BP神经网络权值算法速度慢、易陷入局部极小等缺陷,在权值平衡算法的基础上,提出了一种激励函数参数可调的前馈神经网络,并给出了相应的权值和参数快速学习算法。
短句来源
     The BP neural network with particle swarm optimization technology heavily increase the congruence speed of the networks to avoid involving local extremum.
     在研究粒子群优化神经网络训练算法的基础上,训练BP神经网络使网络的收敛速度大大提高,避免陷入局部最优解;
短句来源
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  local extremum
For some equilibrium states the principle becomes a local extremum principle and it can then be used in conjunction with the potential energy principle to provide bounds on the total potential energy.
      
The theory is based on the local extremum diminishing (LED) principle, initially proposed by Jameson [12], [13] in 1993 for nonlinear scalar conservation laws.
      
(2) The characteristic scale of a local structure is indicated by a local extremum over scale of normalized derivatives (the Laplacian).
      
Quasidifferentiability of real-valued functions and local extremum conditions
      
The antidirectional figure-flow curve connects between the toppoint and another local extremum to which the toppoint is subordinate.
      
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The local extremum points in the projection pursuit(PP) have played an important role. Many interesting structures are directly related to the local extremum poillts in the PP procedures. Hence, it is very helpful to give some suitable statistical tests to separate the local extremum points from noise. In this paper, a procedure is proposed for constructing tests for the local extremum points of any object function. The asymptotics of these tests are also developed.

ONTESTSFORLOCALEXTREMUMPOINTSINPROJECTIONPURSUITZHANGJian;LIGuoying(InstituteofSystemsScience,AcademiaSinica,Beijing100080,Ch...

Some problems in usual minimum entropy deconvolutions are analysed and improved in the following aspects:. The criterion of logarithmic canonical variance modulo is used to eliminatethe negative influence of minimum entropy deconvolution upon weak refIectionwaves.. Zero phase restriction is introduced into deconvolution operator so as to reduce the phase change of input data which is caused by minimum entropy deconvolution.. The method for determining iterative initial filter according to the characteristics...

Some problems in usual minimum entropy deconvolutions are analysed and improved in the following aspects:. The criterion of logarithmic canonical variance modulo is used to eliminatethe negative influence of minimum entropy deconvolution upon weak refIectionwaves.. Zero phase restriction is introduced into deconvolution operator so as to reduce the phase change of input data which is caused by minimum entropy deconvolution.. The method for determining iterative initial filter according to the characteristics of Fourier spectrum of input data is given to solve local extremum problemand to speed up convergence.Theoretical and real data processing results show that this method is a satisfactory and practical deconvolution method.

本文对常规最小熵反褶积方法中存在的一些问题进行了探讨和改进:①为克服最小熵反褶积对弱反射的压制作用,本文采用对数型规范方差模准则;②为了减少最小熵反褶积对输入记录相位的改造,本文对反褶积算子加入了零相位约束;③为了克服局部极值问题并加速收敛,本文按输入记录傅氏谱的特征给出了确定迭代初始滤波器的方法。理论和实际资料处理表明,该方法是一种较理想、较实用的反褶积方法。

Multiscale boundary detection is equivalent to searching out the local ex-tremum of wavelet transform modulo of image. 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 points. Us-ing above theory,one may take local extremum of wavelet transform modulo to de-tect both event location and characteristic fault point location of 2-D reflection...

Multiscale boundary detection is equivalent to searching out the local ex-tremum of wavelet transform modulo of image. 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 points. Us-ing above theory,one may take local extremum of wavelet transform modulo to de-tect both event location and characteristic fault point location of 2-D reflection seis-mogram. In other words,one can estimate local Lipschitz exponent and smoothingfactor,automatically trace seismic events and determine fault points along the scalestretch direction of wavelet transform modulo.

多尺度边缘检测等价于寻找图像的小波变换模局部极值。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。本文借助这种思路,利用小波变换模的局部极值,检测了二维反射地震记录同相轴位置和断点特征位置,即通过沿小波变换模的尺度伸展方向,估计出局部Lipschitz指数和光滑因子,并自动追踪同相轴和识别断点。

 
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