the mean square是什么意思

用法例句

The fact that the mean square of AC coefficients in DCT is equal to the variance of pixels was employed to represent the motion complexity of macroblock(MB).

利用DCT域中交流系数的均方和代替像素域的方差,作为宏块运动复杂度的表征,并将改进后的码率模型运用于H。

Firstly,screen the descriptors using support vector machine regression(SVR) by leave-one-out method based on the minimum mean square error(MSE),get the optimal kernel and the corresponding retained descriptors.

首先以均方误差(MSE)最小为原则,以留一法通过多轮末尾淘汰实施分子结构描述符的非线性SVR汰选并给出最优核函数和相应保留描述符;其次基于待测样本与训练样本保留描述符向量的欧氏距离,以不同k-近邻群子模型双重留一法预测值反映样本集的异质性;然后基于MSE最小,以留一法通过多轮末尾淘汰实施近邻群子模型的非线性SVR汰选并给出最优核函数和相应保留子模型;最后基于保留子模型以双重留一法实施组合预测。

For the generalized linear model with aggregated data:Y=Xβ+u,Eu=0,Var(u)=σ2∑,this paper is built two kinds of biased estimators: ridge estimator β(k)and improved ridge estimator β(k)which are discussed some superiority to the estimators in the sense of mean square error.

在均方误差意义下,研究了它们的优良性,并将岭估计与改进岭估计进行了比较,推广了有关文献中的结果。

As to seemingly unrelated regression system,a new biased contracting estimator of the parameters is put forward,which is the combination of generalized ridge covariance-improved estimator and Stein estimator,and the good features of this estimator in mean square error is discussed.

对于一类相依回归系统,结合广义岭型协方差改进估计与Ste in估计,提出了一种新的有偏压缩估计,,并讨论了该估计在均方误差下的优良性质。

The criterion is that the location with according to the maximal mean square deviation of the AE signals is the height level of fluidized bed.

利用颗粒运动碰撞壁面产生声波的机理以及声波信号随流化床高的规律性变化,根据料位处的声信号能量及声信号均方差均达到最大的状态,提出了声信号测定料位高度的判据,即声信号的均方差比达到最大时的床高即为料位高度。

The reason is that the formula of calculating mean square deviation .

研究发现其根本原因是回归分析中均方差计算公式不合适。

A linear relation is proved to exist between the average gas consumption and mean square deviation.

本文通过对运输车队每天油耗数据的收集整理 ,采用回归分析方法 ,得出运输车队平均油耗与均方差之间存在显著的线性关系 ,从而可考虑通过缩小一个车队油耗的均方差来降低平均油耗 ,达到节约用油提高经济效益的目的 。

The non_linear planar mean square response and the random stability of a viscoelastic cable that has a small curvature and subjects to planar narrow band random excitation is studied.

　基于Kelvin粘弹性材料本构模型,研究小曲率粘弹性索在窄带随机激励作用下的非线性随机稳定性及均方响应·　首先建立小曲率粘弹性索数学模型;然后提出一种确定粘弹性索均方响应及概率渐近稳定性方法;给出了系统均方稳定对激励带宽、幅值、中心频率等要求;给出系统的稳定区域;最后讨论了材料粘性、波速比及介质阻尼对系统不稳定区域的影响·

This paper presents a dynamic design method in which the mean square responses for certain points (DOF s) on the structure under random excitation are regarded as constraints.

本文提出一种将结构在随机激励下某些点（自由度）上的均方响应作为约束的动力学设计方法。

The numerical results of several kinds of nonlinear random vibration systems with single degreee of freedom show that mean square responses.

对几个典型的单自由度非线性随机振动系统进行了均方响应分析，结果表明，本文所建议的加权列式更接近于精确解，是一种更有效的计算方法。

Consequently, the diffusion types are determined from the mean square displacement.

我们也讨论了由方程所确定的扩散过程的位移变量的偶数阶矩,并且得到了二阶矩(均方位移)关于时间的幂律关系,从而对系统的扩散类型进行判断。