企业信息化递进发展模型及其水平指数

对企业信息化的发展阶段进行划分 ,提出了企业信息化递进发展模式 建立了企业信息化水平指数及测算方法 ,给出了实际应用案例     

板锥网壳结构的动力特性分析

板锥网壳结构是一种受力性能合理 ,技术经济效益良好的新型空间结构形式。对板锥网壳结构的自振特性及其影响因素进行了系统分析研究 ,并与普通双层网壳结构进行比较 ,得出了可应用于工程实践的重要结论     

交通检测器在高速公路中的应用及评价

交通检测器是高速公路管理系统必不可少的组成部分，通过对各种交通检测器的检测原理，特点的分析，对其在高速公路上的应用效果进行了评价。     

防止大型筒类薄壁件冷裂的工艺措施

采取了加强铸件薄弱断面处强度和提高砂芯整体“宏观”退让性八项工艺措施，有效地防止大型筒类薄壁件冷裂纹缺陷     

带曲率补偿的带隙基准电流源的设计

简单介绍了带隙基准源的基本原理,给出了一款基于Widlar结构的带曲率补偿的带隙基准电压电流源的设计方法,通过采用TSMC₀.5μm工艺库对电路进行仿真,在-40～150℃的温度范围内,其带隙基准的输出具有12ppm/℃的温度系数,电流基准的输出具有42ppm/℃。此外,文中还对曲率补偿电路的工作原理进行了分析,并且通过仿真波形对曲率补偿的工作机制进行了讨论。     

Construction and verification of retinal vessel segmentation algorithm for color fundus image under BP neural network model

To improve the accuracy of retinal vessel segmentation, a retinal vessel segmentation algorithm for color fundus images based on back-propagation (BP) neural network is proposed according to the characteristics of retinal blood vessels. Four kinds of green channel image enhancement results of adaptive histogram equalization, morphological processing, Gaussian matched filtering, and Hessian matrix filtering are used to form feature vectors. The BP neural network is input to segment blood vessels. Experiments on the color fundus image libraries DRIVE and STARE show that this algorithm can obtain complete retinal blood vessel segmentation as well as connected vessel stems and terminals. When segmenting most small blood vessels, the average accuracy on the DRIVE library reaches 0.9477, and the average accuracy on the STARE library reaches 0.9498, which has a good segmentation effect. Through verification, the algorithm is feasible and effective for blood vessel segmentation of color fundus images and can detect more capillaries.