样本问题

Based on the second PA derivative of mean steady-state system time with respect to a parameter of the service time distribution, we give the second-order stochastic approximation algorithm.

当最优化问题过于复杂，无法使用解析方法分析时，一个可行的方法是在参数的取值范围内用逐次逼近法找到最优点；在使用此类优化算法时，目标函数的样本导数是必需的。

Taking the Guyang county of Baotou city as a test area, the ETM ＋ multi spectral data and CBS pan data are merged by the method of Principal Components Analysis.

为解决此问题，笔者以包头固阳县为研究区，利用主成分变换的方法，对多源遥感影像（ETM＋多光谱数据和中巴资源二号卫星全色波段数据）进行融合处理；同时，在分类中，采用监督分类辅以目视解译分类法相结合的混合分类法，改进训练样本选取方法，进行变化信息的提取，同时给出了易混淆地物的遥感解译标志。

"This one burst raises all sorts of questions," says Michelson."In a few years, we'll have a fairly good sample of bursts, and we may have some answers."

"这次爆发给我们提出了一系列的疑问，"米歇尔森说，"在今后的几年内，我们或许会发现更理想的爆发样本，从而获取一些问题的答案。"

Starting from the signal of pressure and temperature, this paper does a series of theoretical and experimental researches on the following topics: the fundamental theory of the thermal parameter method, its field of application, the choice of diagnostic signal, the choice of the technologies on analysis of the signal, the foundation of the database of the fault samples, the application of the artificial nerve net technique and the error analysis of the experimental systems.

本文以参数法中的热力参数为研究对象，以压力、温度信号为研究信号，就热力参数法的基本原理、适用范围、诊断信号的选择、诊断信号分析技术的选择、故障样本库的建立、人工神经网络技术的应用及实验测试系统的误差分析等一系列问题展开了较深入系统的理论和实验研究。

Methods A weighted statistical model was presented to solve the problem of adaptability to deformation and tilting while detecting nonrigid image targets using a priori knowledge information and statistical knowledge-based model.

提出用于检测非刚性图像目标的一种加权统计模型，该模型含有待检测目标样本的统计值，可有效解决图像目标发生形变和倾斜情况下检测器的适应性问题。

The results indicate that the improved grey target could meet the invariance of effect samples after nonsingular linear transformation caused by clout distance; the weighted Mahalanobis distance is just the weighted Euclidean distance when there is no correlation among observed indexes, which avoids correlation of decision indexes, influences of different dimension and differences of importance on effect of decisions, and the incompatibility of grey target transformation.

结果表明，改进后的灰靶满足：靶心距对效果样本作非奇异线性变换的不变性；当观测指标间不存在相关性时，加权马氏距离就是加权欧氏距离。避免了决策指标间的相关性、不同量纲和重要性差异对决策效果的影响以及灰靶变换的不相容问题。

The normal transformation polynomial is used by some researcher in practical probabilistic analysis in structural or civil engineering; especially when multivariate random variables with the probabilistic characteristics expressed using only statistical moments are involved.

本论文提出了两种样本点选取策略，即方向余弦策略和有限步长策略，对响应面法进行改良；本方法一次性拟合响应面方程，避免了常规响应面法的复杂迭代运算，且对高非线性问题有较好的适用性。

An improved algorithm based on former ones was proposed. It introduced mirror image to enlarge sample capacity and adopted the method of the null space of the within-class scatter matrix Sw to get the best solution of Fisher criterion.

为解决此问题，在已有算法的基础上，引入镜像图像来扩大样本容量，并采用零空间的方法求得Fisher准则函数的最优解。

In order to solve the problem of insufficient fault samples in intelligent monitoring and diagnosis for machinery, a new method of one-class classification of mechanical faults-support vector data description is proposed.

为了解决在机械智能监测与诊断中缺少故障样本的问题，提出了一种机械故障单值分类的新方法－支持向量数据描述法。

In view of the existing problems of traditional resource allocating networks, a design method for RAN based on rough set and orthogonal least square was proposed. Firstly, rough set was applied to intelligent data analysis for extracting typical characteristics from the training samples, and then OLS was used to select best centers as the hidden layer nodes.

针对常用的资源分配网络存在的问题，提出了一种基于粗糙集和正交最小二乘的资源分配网络设计方法，通过粗糙集数据分析与处理提取训练样本中典型的数据特征，再结合正交最小二乘学习算法选取对输出能量贡献最大的数据中心加入到隐层节点。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。