Aiming at traffic sign problem, the traditional LeNet-5 network structure has low accuracy of traffic sign recognition, slow identification speed and ignores natural factors such as weather. A convolutional network structure model with two-channel and multi-scale based on LeNet-5 improvement is proposed by convolutional neural network technology. In the dual-channel structure, each channel contains two branching structure, and the number of convolution and image scale of each channel is different, making the feature extraction of different image scales richer. Secondly, the improved network structure greatly increases the number of convolutional kernels compared to the traditional LeNet-5 network structure. Finally, by changing the Sigmoid activation function to the ReLu activation function, changing the stochastic gradient descent algorithm to the Adam algorithm, and adding Dropout layers to prevent overfitting and setting the learning rate, thus increasing the traffic sign recognition rate. The recognition rate of the improved network is 98.6%, floating by 0.5%, relative to the traditional LeNet-5 network structure, the recognition rate increases by more than 15%, verifying that the improved network structure has a certain robustness.
In order to investigate the effect of high temperature on the performance of three high viscous asphalt in company with various aging degrees (ADs), multiple stress creep recovery (MSCR) test was employed. CRR and irrecoverable compliance were also carried out to measure the high temperature resistance of high viscous asphalt to external loading in the presence of various aging conditions (ACs) as well as to examine the sensitivity of high viscous asphalt towards the stress. The findings of the study demonstrated that after short- and long-term aging, the high-viscosity asphalt turned harder. Also, type I high-viscosity asphalt was observed to have the greatest deformation resistance acted upon by various stress fields and ACs. Furthermore, in company with various ACs, while the average creep recovery rate (CRR) of Type I and Type II high-viscosity asphalt was found to be higher than that of the SBS modified asphalt, the average irrecoverable compliance was observed to be smaller. This indicated the significant effect of high-viscosity modifiers on the improvement of the elastic recovery performance of asphalt and its resistance to high temperature flow deformation. Contrary to the order of their CRRs, the magnitude of stress sensitivity of the three high-viscosity asphalt at various ADs was observed to be type II < type I < SBS modified asphalt, indicating a good negative correlation between stress sensitivity and average CRR. Furthermore, the obtained results revealed that, in the presence of various ACs, the high temperature viscoelastic qualities of high viscosity modified asphalt is considered by the MSCR test. Also, to comprehensively evaluate the high temperature performance of high viscosity modified asphalt at various Ads, the use of such indexes as the average CRR, average irrecoverable compliance and stress sensitivity coefficient were essential.
针对大规模自组网技术MAC(medium access control)协议中的动态时隙分配算法在模拟仿真测试环境中存在的需要进行大量代码重构及可视化呈现差等问题,以及在实物组网测试时存在的测试环境搭建困难、测试成本高和测试效率低等问题,提出一种新的测试方法.该测试方法使用纯软件来模拟各个节点不同的业务量及拓扑结构,无需实物组网即可方便地重复验证大规模自组网环境中的动态时隙分配情况是否符合预期,同时对测试结果进行精准可视化呈现.实验结果表明,该测试方法能够准确验证大规模、高业务并发场景下的动态时隙分配情况,并对动态时隙分配算法的设计、开发及优化过程加以指导,从而提高研究效率.该测试方法已在多个项目中成功应用并取得良好效果.
In order to meet the requirements of traceability of clinical p27 protein measurement results,reference materials of avian leukosis virus p27 protein lyophilized powder were developed.The value of the reference materials of avian leukosis virus p27 protein lyophilized powder were evaluated by HPLC-IDMS/MS in several laboratories,and the certified values were(1.46±0.13)mg/mL.The developed method is accurate and reliable,it is able to be applied for the development of p27 protein reference material.The result indicated that the reference materials were sufficient homogeneity and had good stability,could be stored for up to 7 days at-20℃,4℃and room temperature.It could be stored for 6 months at-70℃.The development of p27 protein reference material is important for quality control of avian leukemia assays and for the evaluation of different avian leukemia assays.
