查询词典 kernel function

Each sample point is shifted to the local maximum of the kernel function by a mean-shift based clustering procedure.

提出了一种快速去除散乱点云数据表面噪声和离群点的鲁棒滤波算法。

This project studies the scale-dependent deformation behavior of the metal matrix composite, the void nucleation and void growth mechanisms at the micron/submicron scale. The main results are:(1) In prophase, growth and coalescence of the void embedded in the graded matrix are analyzed in detailed;(2) Based on the infinite solid model containing a micro-void, coupling effects of the void shape and the void size on the void growth are studied carefully, the results show that it seems to exist a critical equivalent void radius, which is associated with the material length. When radius of a microvoid is close to or smaller than the critical void radius, the micro-void growth rate is essentially eliminated;(3) The coupling effects of the particle shape and size on the mesoscopic stress fields within the particle and matrix are also investigated by introducing the conception of inclusion/matrix interfacial energy. The results show that the stress concentration factors within the particle and on the matrix/particle interface are also strongly size-dependent,so the void nucleation mechanism is size-dependent.(4) By employing a specific orthogonal curve coordinate frame and a 'kernel function' conception, a 'unified method'solving the spheriodal and spherical void problems is suggested; by this unified method, size-dependent plastic potentials of the porous materials containing the spheriodal or spherical voids are obtained, which extend the traditional Gurson model for the spherical void and GLD model for the spheriodal voids to the micron scale.(5) Based on the RVE model containing the spheriodal or spherical particles, the influences of the particle shape and size on the size-dependent mechanical behavior of metal matrix composite are studied.

中文摘要：本项目对金属基复合材料在微细观尺度下的尺度相关变形行为、孔洞形核及长大的机理和模型进行了研究，取得了如下主要结果：1）在前期研究中，探讨了基体的梯度分布对孔洞长大和聚合的影响；2）基于含孔洞的无限大体模型，探讨了孔洞形状和孔洞尺寸对其长大的耦合作用，结果表明：可能存在一个与材料特征长度相关的临界孔洞尺寸，当椭球孔洞的等效半径小于临界孔洞半径时，孔洞的长大受到明显抑制；3）通过引入基体/夹杂界面能的概念，分析了夹杂尺寸、夹杂形状对材料细观应力场的耦合影响，结果表明：颗粒内部和界面上的应力集中因子强烈地依赖于夹杂的尺寸和形状，因此，孔洞的形核机理是尺寸相关的；4）采用一种特殊的正交曲线坐标系和引入"核函数"的概念，"统一"地得到了含椭球和球形孔洞的材料的尺寸相关塑性势，它将传统的Gurson球形孔洞模型和GLD椭球孔洞模型推广到微尺度范围；5）基于含椭球和球形夹杂的体胞模型，初步研究了夹杂形状、夹杂尺寸对金属基复合材料尺寸相关力学行为的影响。

It is presented to choose σ parameter of kernel function on dynamic, which enhances preciseness rate of diagnosis.

神经网络方法(Neural Networks，NN)在故障诊断中的应用研究取得了很多的成果，但它在网络结构选择、网络的训练及提高网络的泛化能力等方面存在的许多问题，限制了它在工程实际中的广泛应用。

KNN analysis was independent of the correlated regression model, but directly affected the model structure. Via KPCA as a middle layer, under the instruction of assorted result of the kernel function, the method was able to capture the high-ordered principal components among the secondary variables, and use SVR to establish a correlated regression model between the featured principal components and the primary variable.

KNN分析独立于后继回归模型，却又直接影响模型结构，KPCA作为中间层，在KNN分类结果指导下提取不同类别包含辅助变量高阶信息的特征主元，然后使用SVR建立特征主元和主导变量之间的回归模型。

Based on the Gaussian kernel function, the recursion formula of bandwidth is derived.

在未知总体分布的情形下，给出密度核估计中选择窗宽的一个新方法，并在选取高斯核的情形下，推导出计算窗宽的递归公式。

A new filtering method for Synthetic Aperture Radar image is presented based on support vector regression and wavelet kernel function.

基于支持向量回归理论和小波支持向量核函数，提出了一种新的SAR滤波方法。

Then we propose a new modeling method: Support vector machine, especially the support vector regression, kernel function.

然后提出了一种新的建模方法：支持向量机回归算法，该算法的核心部分是核函数与两个模型参数的确定。

Experiment shows it is perfect to classify study sample itself by the kernel function in this thesis, and the generalization ability of it is more predominant than SVM of traditional one.

实验表明了本文的核函数对学习样本本身的分类良好，而且泛化能力优于传统的核函数的SVM。

A distance is defined between two sample points in high-dimension space by means of kernel-function technique.

通过核函数技巧，定义了高维空间中两样本点之间的距离。

In the optimization algorithm, the kernel function and some parameters of support vector machine were optimized synchronously.

在GA对R寻优过程中，SVM的几个参数以及核函数同时进行最优化。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了