超小型He-Ne激光管的研制

采用阴极挡筒及小孔光栏结构,成功研制了上型He-Ne激光管。     

健身操锻炼效果的生化测评

通过测定健身操运动前后血乳酸的浓度变化,得出运动后血乳酸值在6.5mmol/L左右,说明该项运动强度稍高于“无氧阈”水平,它是一种既靠有氧代谢又靠无氧代谢供能的运动。     

粘性守恒律方程的粘性激波

考虑一类粘性守恒律方程粘性激波问题,证明了存在临界门槛,在门槛之上存在粘性激波,在门槛之下存在连续波前波。     

Canopy在划分聚类算法中对K选取的优化

针对划分聚类算法中聚类数K的取值工作量较大的问题, 提出一种新的Canopy+算法. 该算法可实现对聚类个数K的预判, 在保证准确率的前提下提高聚类工作效率.     

铁路设计项目招投标管理问题研究

投标与招标是相互对应的概念,有招标人出价,才有投标人中标的机会。文章主要分析了铁路设计项目在投标时应注意的问题及采取的措施以取得竞标的胜利。     

传染病动力学模型中的阈值

用 SIR 和 SIS 模型分析了传染病的流行规律，给出了一般自治系统的求阈值方法.     

Modified wavelet filtering algorithm applied to gyro servo technology for the improvement of test-precision

In order to improve the measurement-precision of the gyro,the gyro experiment is completed based on gyro servo technology.The error sources of gyro servo technology are analyzed in the process of measurement,and the impact of these error sources on measurement is evaluated.To eliminate interference signal existing in the sampled data of the measurement,a modified wavelet threshold filtering method is presented.The results of the simulation and measurement show that the estimation-precision of the proposed method is improvement remarkably compared with the fast Fourier transform method,and the calculation work is reduced compared with the conventional wavelet threshold filtering methods,furthermore,the phenomenon of a common threshold of "killing" is solved thoroughly.     

SAR image despeckling based on edge detection and nonsubsampled second generation bandelets

To preserve the sharp features and details of the synthetic aperture radar (SAR) image effectively when despeckling, a despeckling algorithm with edge detection in nonsubsampled second generation bandelet transform (NSBT) domain is proposed. First, the Canny operator is utilized to detect and remove edges from the SAR image. Then the NSBT which has an optimal approximation to the edges of images and a hard thresholding rule are used to approximate the details while despeckling the edge-removed image. Finally, the removed edges are added to the reconstructed image. As the edges are detected and protected, and the NSBT is used, the proposed algorithm reaches the state-of-the-art effect which realizes both despeckling and preserving edges and details simultaneously. Experimental results show that both the subjective visual effect and the mainly objective performance indexes of the proposed algorithm outperform that of both Bayesian wavelet shrinkage with edge detection and Bayesian least square-Ganssian scale mixture (BLS-GSM).     

多维特征空间中模式分类神经网络的一种设计方法

提出了一种在多维空间Ｒｎ中模式分类神经网络设计的新方法。可确定网络的拓扑结构，包括隐层、隐元个数及连接权系数。特别是由于二次阈值神经元的特例——超球面阈值神经元的使用，对特征空间Ｒｎ的分割比使用超平面阈值神经元时需利用Ｖｏｒｏｎｏｉ图进行凸区域分割简便的多。因而设计成的神经网络结构清楚直观。     

仿射群概型ap的表示与幂零矩阵

通过把仿射群概型的表示转化成对幂零矩阵的讨论，将仿射群概型的研究具体化。借助Matlab的相关工具求解幂零矩阵，得到了对应仿射群概型的表示。