查询词典 variance

How to assess the controler's performance, do the faulty detection and forecast it is not only this paper concerns but also attracts many scientists and engineers to research it. This paper uses minimum variance as bench mark, does the performance assessment for the deaerator's control system with filter and correlation arithmetic.

如何评估控制系统的性能，预报故障的发生，并诊断引起控制性能下降的原因，已经引起了学术界和工业界的广泛重视，本文在这方面进行的研究具有一定的实际意义。

In this study, although the quantity of the scatter power can not reflect the content of blood flow, the scattered power variance is statistically significant between benignancy and malignancy （p=0.014 , sensitivity=80%, specificity 64%）. However, the PW Var does not have sufficient statistical significance in differentiate the normal tissue perfusion from the malignant one.

另外 Power Doppler的功率强度在整个实验的比较结果，虽然并不能证明与血流量、压力波有直接的关连，但是恶性肿瘤的功率强度的变异量均明显高於良性肿瘤（P=0.014 Sensitivity=80% Specificity 64%），不过恶性肿瘤却与正常组织无法区分。

Materials and Methods:236 pathology-confirmed breast lesions(155 malignanty,81 benignancy) and 221 disease-free contralateral breast tissues were examined using EPI-DWIb values=0,1000 s/mm~2TR/TE=8400ms/93.8ms; FOV=30×30cm;matrix=128×128;ASSET=2,slice thickness=4mm.DCE-MR imaging was also performed for accurate location of the lesion using VIBRANT sequence.The mean ADC values of malignant and benign lesions and the disease-flee contralateral breast tissues were calculated from the ADC map for each patient.One-way analysis of variance was applied to compare the mean ADCs of malignant lesions with benign lesions and disease-flee contralateral breast tissues.The threshold ADC value for malignant lesion was determined using a receiver operating characteristic(ROC curve analysis.Each lesion was classified into two major types:mass and non-mass lesion.The diagnostic performance of DWI was compared in breast mass and non-mass lesions.Results:155 malignant and 81 benign lesions were confirmed in 236 lesions.

材料与方法：搜集术前行乳腺MR检查并经穿刺或手术病理证实的236例乳腺病变，以对侧正常乳腺腺体作为正常对照，采用横轴位的平面回波-扩散加权成像序列，TR=8400ms，TE=93.8ms，层厚=4mm，激励次数=2：视野=30×30cm，矩阵=128×128，ASSET=2，b值=0和1000s/mm~2；参考动态增强图像准确定位，测量病变区和对侧正常乳腺腺体的ADC值，应用t检验比较良、恶性病变及正常腺体ADC值的差异，采用接收者工作特征曲线(receiver operating characteristic curve，ROC)确定良恶性病变的ADC界值；根据BI-RADS MRI将乳腺病变按照形态学表现分为肿块性病变和非肿块性病变两组，比较ADC值在肿块和非肿块性病变中定性诊断的效能。

Results: The accepting liquid concentration of benzocaine ointment containing 7% of LP was singnificant higher than that containing 1%, 3%, 5%, 10%, 13%, and 16%(P＜0.01) by the analsis of variance.

结果：经方差分析，含7%azone的苯佐卡因软膏的接受液浓度明显高于含1%，3%，5%，10%，13%，16%azone的软膏(P＜0.01)；含azone和二甲基亚砜的混合透皮促进剂其接受液浓度明显高于单一的azone组(P＜0.05)。

Robust best invariant unbiased estimator, quadratical form, variance/covariance components

稳健最优不变二次无偏估计，二次型，方差和协方差分量

Results: Gardnerella Uu Mh CT exist magnificent variance between BV group and no-BV group.

结果：阴道加德纳菌、Uu、Mh、CT在BV组和对照组间检出率存在差异。

There are two findings summarized from previous studies:(1) the least squares estimator is a common choice of researchers, but under an unequal probability design, the estimator is biased,(2) the probability weighted estimator is consistent but may have a large variance.

过去的研究发现：(1)在不等机率抽样时，一般常用的最小平方法所得到的回归参数估计式并非不偏估计式；(2)机率加权最小平方法可以改善不偏性，然却增加估计的变异程度。

However, MLE is a biased estimator of the fold change and minimum variance estimator of the fold change exists under the log-normal distribution.

然而相对表现量在对数常态分布时应用最小变异不偏估计法较 MLE 具有不偏性和最小变异。

Minimum variance control and adaptive control algorithms for general bilinear systems are developed.

在分析研究的基础上，对自适应控制的理论及其应用进行了比较详细的论述。

By adding an additional accent color, perhaps a coral or a kelly green, we could add a bit more depth and variance in this stagnant space.

通过增加一种额外的色彩基调，也许是珊瑚红色或着是凯利绿色，我们可以增加一点深度感和不一致的设计感觉在这个空间里。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。