主元

First,the main procedures and the distinctive features of the most-obtuse-anglerow or column pivot rules are introduced for achieving primal or dual feasibility in linear programming.

首先回顾了采用最钝角行、列主元规则求解线性规画问题的原始、对偶可行解的主要过程，阐述了其与众不同的特性。

Therefore, a transmit antenna selection algorithm based on QR decomposition with column pivoting is put forward, which is easy to compute.

因此，提出了一种基于列主元QR分解的发射天线选择算法，这种算法具有很低计算复杂度。

For the algorithm, the kernel primary component model according to the normal system is constructed firstly.

本文提出了基于核主元和多支持向量机分类的过程监控和故障诊断方法。

A face recognition method based on wavelet and Image Principal Component Analysis is presented.

提出了一种基于小波变换和图像主元分析相结合的人脸识别方法。

A method of fault detection and diagnosis based on wavelet de-noise and principal component analysis is proposed.

提出了一种基于小波去噪和主元分析的故障检测和诊断方法。

Principal Component Analysis is studied and some modifications are discussed to improve the performance of PCA.

详细介绍了主元分析方法、其存在的缺点及相应的改善方法。

Principal Component Analysis, Cluster Analysis and Probabilistic Neural Network were used in the data analysis and pattern recognition.

并通过主元分析、聚类分析和概率神经网络对数据进行了分析和识别。

Principal component related variable residuals statistic of improved PCA can be used to make further diagnosis when T~2 plot diagnoses fault but Q plot.

在Q图未检测到故障而T~2图检测到故障时，利用改进PCA方法的主元显著相关变量统计量图对工况做进一步诊断。

It's pointed out that soft sensor will play more important role in field bus network control system. According to this, a crude solution was addressed. At last, we point out that soft sensor technology must used to build an information warehouse for the whole enterprise, combined with data fusion, data warehouse, data rectification and other related technologies. The main contributions of this dissertation are as follows: The background, requirement, and application situation of soft sensors are expounded, the theories, methods and skills of soft sensing technology are analyzed, and the fruits and problems in current soft sensor technologies are summarized. Some new methods of soft sensor is proposed: A principal component analysis-based secondary variable selection method are proposed; A new conception which modeling data should have gross error detection is addressed, and then a cluster analysis-based modeling data gross error detection method is given.

本文的主要贡献有：对软测量技术根据实践的要求进行了一定的理论研究，针对具体问题提出了新的方法：讨论了辅助变量选择问题，研究了基于主元分析的辅助变量选择方法，该方法克服了传统方法只能利用数学模型产生的仿真数据进行最优辅助变量选择的缺点，可以根据历史数据进行辅助变量选择；提出了建模数据显著误差侦破的概念，指出传统的显著误差侦破研究的是已知过程数学模型的情况，而建模时数学模型是未知的，但是直接来自现场的数据并不能保证不含显著误差，并用基于聚类分析的方法解决了该问题，该方法利用聚类分析原理，直接面对过程数据，不需以过程模型为基础，在此基础上给出了软测量建模过程中样本数据的处理方法。

A new fault diagnosis method of machine based on the sparse kernel principle component analysis is proposed.

提出一种基于稀化核函数主元分析的机械故障诊断新方法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失