抽样点

The basic properties of the importance measure of the basic variable effect on the failure probability are discussed in this paper. Since the saddlepoint based line sampling method is independent of the distribution types of the random variables, and has the advantages of high accuracy and efficiency, this method is employed to estimate the defined importance measure.

文中分析了所定义基本变量对失效概率影响重要性测度的基本性质，并基于鞍点线抽样在求解可靠度时不受随机变量分布形式的限制及其效率和精度较高的优点，提出了求解该重要性测度的鞍点线抽样方法。

Finishing calculation of mean value, standard deviation, skewness, kurtosis of Beta distribution.(2) Fitting parameters of many kinds of typical distribution and using residual deviation to evaluate fitting precision.(3) Using Beta distribution as an agreed indication distribution applied to many kinds of practical photoelectric measurement distributions.(4) Deriving theory formula of Bayes point estimation about Beta distribution parameters and mean value and standard deviation on the condition of mean square error loss function and supposed the prior distribution is uniform distribution.(5) Generating MCMC sample from post distribution by the method of Gibbs sample algorithm. Calculating bayes point estimation from sample on the condition of mean square error loss function. Calculating confidence interval by an approximate method to complete interval estimation.

本文的主要工作有：(1)解决了Beta分布参数a和b的精确计算以及均值、标准差、偏度、峰度的计算问题；(2)拟合出10余种典型分布的Beta分布的两个参数，并且采用剩余标准差评价该Beta分布的拟合精度；(3)对多种典型的光学与光电测量系统的测量分布进行了Beta分布统示表示；(4)在假设先验分布为均匀分布前提下，得到参数a和b以及均值μ和标准差σ在均方误差损失函数下的贝叶斯点估计理论计算公式；(5)利用直接抽样的Gibbs抽样算法，从后验分布中产生MCMC样本，从样本直接计算均方误差损失函数下的贝叶斯点估计，并使用一种近似方法计算其置信区间，完成区间估计。

But in its realization, the definition of differential sampling parameter and data structure given by Gross and Lippert need to be consulted.

修正现有文献中差分因子的定义，由此提出新的数据结构，阐述利用同一光线上相邻抽样点的相关性构造数据结构的技术。

Firstly, the outage model of components is decided; then based on the load variation curves of load nodes the sampling, calculation and analysis of various system states are performed by enumerative sampling method.

首先确定元件的停运模型，然后以各负荷点的负荷变化曲线为基础采用枚举抽样法对各系统状态进行抽样计算与分析。

Genetic algorithm optimization process can be seen as algorithms in the process of constant cycle of viable domain random, using the results of previous sampling probability distribution on the target point estimates, and then based on an estimate of the projected distribution of a sample point.

遗传算法优化的过程，可以看作算法在循环过程中不断对可行域进行随机抽样，利用前面抽样的结果对目标点的概率分布进行估计，然后根据估计出的分布推算下一次的抽样点。

A calculation method of reliability for slope stability,whose state function is implicit function,was researched.

利用其计算可靠度指标和验算点，然后将安全系数计算近似方程、隐函数计算方程和验算点结合起来，确定新的展开点和抽样点，并进行近似方程再拟合、可靠度指标的循环计算直到收敛。

Firstly,the sampling design has great impact on the accuracy of remote sensing classification.There exists great randomicity on the result of points and cluster sample verification on the different Sampling design.On the same sampling design,the stability of point sample verification is higher than that of Cluster sample verification.Secondly,the average accuracy of different sampling designs of multi-point and multi-cluster sample verification can reflect the accuracy characteristic.During the course of point sample verification,stratified sampling's error is lower than others'.During the course of cluster sample verification,systematic sampling and stratified sampling's accuracy are prior to simple random sampling's.

研究结果表明：（1）抽样方式对遥感分类精度评价结果的影响是客观存在的，不同抽样方式下的点样本和群样本检验结果都存在一定的随机性，但同一种抽样方式下，点样本检验精度评估结果的波动幅度小于群样本检验，稳定性比群样本检验要好；（2）不同抽样方式下的多次点样本和群样本检验的平均精度检验结果基本上都能够反映分类图像的精度特征，其中，点样本检验中，分层随机抽样点样本检验效果较好；群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。

In order to improve the reliability of field test data, by the estimation theory of sample size, a method of field test route choice is introduced based on wireless network planning.

为了提高路测采集数据的有效性，以根据抽样理论确定的抽样点数目作为指导，结合无线网络规划理论，提出了有效的路测路线确定方法。

It evaluates the process of feature point matc hing by extracting feature point by the Harris corner detector, forming a correlation matrix in terms of the monogenic s ignal elements｛p,q 1,q 2｝,then to the stage of RANSAC inliers selection so as to eliminate the false feature point pairs and to calculate the fundamental matrix of epipolar geometry.

其核心 思想是用Harris角点检测算法提取特征点，然后以单演信号元素｛p，q 1，q 2｝构成相关矩阵，提取出初始特征匹配点对，再用随机抽样一致性算法去除伪匹配的特征点对，选择内点集估计对极几何的基本矩阵，实现图像的配准。

In this paper, we presented the shrub influence model for soil seed bank based on considering height and canopy of individual plants and direction of main-wind

在本项研究中，在结合主风方向，植物个体高度和冠幅及其与抽样点的距离的基础上，确定植物个体对土壤种子库的综合影响模型为

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。