查询词典 sampling distribution

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。

Combined with product's field small sampling test and the accelerate factor's prior distribution,the factor's posterior distribution is presented based on Bayesian method.

并利用Bayes方法，结合额定应力环境下的小子样数据和加速因子的先验分布，推导出加速因子后验分布。

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。

This part has studied on such features of GPS data as time and spatial distribution, sampling intervals, distribution of samples and the coverage rate of road network.

论文主要研究了深圳市GPS数据的时间和空间分布特征、GPS采样间隔特征、路段样本量分布特征、路网覆盖率特征以及路网覆盖率与出租车数量之间的关系。

Uniform random sampling is widely applied to many kinds of algorithms in data mining. It processes uniform distribution data set extremely effectively, but easily loses slight cluster and consequently decreases clustering accuracy, when the processing data set is skew distribution.

随机抽样技术已经广泛应用于数据挖掘的各类算法中，它在处理分布均匀的数据集时非常有效，但在处理分布比较倾斜的数据集时容易丢失小的聚类。

By means of uniform orthogonal sampling, we represent the shape signature of each model as a statistical distribution of its surface normals weighted by view-dependent depth. The distribution is further processed by spherical harmonics analysis to construct the final representation. By calculating the distance between shape descriptors of individual 3D models, a faithful similarity measurement is achieved.

算法从规一化处理后的物体形状出发，计算视点相关的深度加权的物体表面法向统计分布，并对该分布实行球面调和分析，得到深度加权法向映射特征，进而利用特征之间的距离度量任意三维模型之间的相似性。

Monte Carlo is a method that approximately solves mathematic or physical problems by statistical sampling theory. When comes to Bayesian classification, it firstly gets the conditional probability distribution of the unlabelled classes based on the known prior probability. Then, it uses some kind of sampler to get the stochastic data that satisfy the distribution as noted just before one by one. At last, it can obtain the posterior probability distibution of each unlabelled classes by analysing these stochastic data.

蒙特卡罗是一种采用统计抽样理论近似求解数学或物理问题的方法，它在用于解决贝叶斯分类时，首先根据已知的先验概率获得各个类标号未知类的条件概率分布，然后利用某种抽样器，分别得到满足这些条件分布的随机数据，最后统计这些随机数据，就可以得到各个类标号未知类的后验概率分布。

On the north and central sampling belts species altitudinal distribution is markedly lower on the east-facing aspect than on the west-facing aspect, whereas on the south belt species altitudinal distribution between the two aspects does not differ significantly.

结果发现在北边及中间的样带东向坡的物种分布明显地比西向坡的低，但在南边的样带两个坡向物种海拔分布的差距并不显著。

The key technologies of Grid Method including grid divided in basin, impact radius of rainfall and number of reference rainfall stations have been discussed with example. The parameters of Grid Method have been selected through trial and error. Using simple random sampling to simulate the failure to collect rainfall, the relation between surface rainfall calculation error and station density, station distribution, uneven spatial distribution of rainfall has been sought.

论文探讨了流域网格剖分、降雨影响半径、搜索半径范围和参证站数量等关键技术，研究了网格法参数的优选，并采用简单随机抽样模拟降雨缺测情况，给出了面雨量计算误差与流域站网密度、均匀度、降雨分布不均匀性指标的关系。

The investigations included the following:（1） estimation of sea ice distribution by ship-based observations between Middle Weddell Sea and Prydz Bay;（2） estimation of sea ice distribution by aerial photography in the Prydz Bay;（3） direct measurements of fast ice thickness and snow cover, as well as ice core sampling in Nella Fjord;（4） estimation of melting sea ice patterns near the ZhongShan Station; and （5） observation of sea ice early freezing near the ZhongShan Station.

包括：（1）基于走航观测的威德尔海至普利茨湾之间海冰分布研究；（2）基于航空拍摄的普利茨湾海冰分布研究；（3）纳拉海峡固定冰和上浮雪厚度钻孔测量以及冰心钻取；（4）中山站附近融化冰的分布研究以及（5）中山站附近海冰早期冻结过程观测研究。

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。