CTCS-3线路GSM-R网络运维质量评价体系研究

针对高速铁路GSM-R网络承载行车通信业务的特点,分析CTCS-3线路GSM-R网络运维质量评价思路,提出CTCS-3线路GSM-R网络运维质量评价体系,通过GSM-R网络运行数据进行计算得出评价结果,综合反映出CTCS-3线路GSM-R网络运维质量状况。

基于Zhang-Hager线搜索的改进近似最优梯度法

提出一种改进的近似最优梯度法,求解图划分问题中的无约束目标函数.先用修正的BFGS更新公式及选取BB类步长的线性组合作为标量矩阵得到近似最优步长,再引入参数对经典的Zhang-Hager线搜索形式进行改进,构建算法框架并给出R线性收敛性证明.实验结果表明,改进算法提高了原算法的性能.

基于Mask R-CNN和结构光的焊缝特征信息检测方法研究

为了提高焊缝跟踪系统的精准度,提出了一种基于Mask R-CNN和结构光的焊缝特征参数检测系统。通过Mask R-CNN对焊缝结构光图像提取线结构光边界信息,再通过灰度重心法完成对结构光中心线的提取;对中心线图像进行斜率分析,来确定焊缝特征点坐标;最后将坐标信息传输至PLC中,通过PLC控制十字滑台带动焊枪进行焊缝的跟踪操作。避免了强光、灰尘和噪声等干扰,提高了焊缝特征信息检测的准确性。通过与Faster R-CNN和YOLOv5的预测实验对比,Mask R-CNN在焊缝检测中的准确度和稳定性更高。

基于Mask R-CNN模型的铁路隧道衬砌机制砂混凝土裂缝视觉检测

铁路隧道衬砌结构裂缝图像具有复杂的灰度分布和变化特征,局部和全局的多特征信息会干扰跟踪方向和边界跟踪参数,模型可扩展性受限,检测准确率较低。为此,提出基于Mask R-CNN模型的铁路隧道衬砌机制砂混凝土裂缝视觉检测方法。首先输入分段线性变换后的砂混凝土裂缝图像,抽取阈值,生成连通域标识,再以像素点为背景点,在Mask R-CNN模型中,同时检测裂缝区域的位置和标记像素级的边缘掩膜,判定裂缝边界起点与裂缝宽度;然后进行累加视觉检测方法设计,按照裂缝的几何特征以及排序结果,求解裂缝长度,获得完整的裂缝轮廓。试验结果表明,所提方法可以较为完整地检测所有关键位置,裂缝参数信息检测准确率较高;迭代次数升高后,检测结果受到的影响较小,可扩展性得到了改善,可适应任务需求,具有较好的应用价值。

基于改进Faster R-CNN的输电线路断股识别算法研究

为解决输电线路断股图像识别不精确的问题,设计了一种基于改进Faster R-CNN算法的输电线路断股识别检测方法。该方法利用DenseNet121代替VGG16,并融合各密集块的输出特征;同时,采用Soft-NMS算法取代NMS算法来缓解重叠目标漏检的问题。实验结果表明,更换特征提取网络后,mAP达85.1%,且特征融合后的mAP达到了90.2%,相比改进前提升5.1%。采用Soft-NMS算法后,mAP提升了1.6%。最终改进后的模型mAP从80.8%提高到了92.5%,证明了改进后的算法能有效提高检测能力。

基于高性能射线追踪技术的复杂交叉并线场景GSM-R网络优化研究

为解决交叉并线场景中无线网络覆盖优化周期长、效率低等运维问题,以西安北交叉并线场景中的GSM-R网络优化为典型应用案例,提出采用射线追踪技术进行无线网络覆盖优化的方案。首先使用射线追踪校正技术,根据实测数据对射线追踪模型进行校正;然后利用校正后的射线追踪模型,仿真复现交叉并线场景下的电磁环境,分析无线信号的覆盖情况。通过对交叉并线场景中的网络问题进行根因分析,提出相应的网络优化方案,并利用校正后追踪模型推演优化后的覆盖效果,对网络优化方案进行评估。实际的优化结果表明,射线追踪技术能够精确还原交叉并线场景中GSM-R网络的无线覆盖问题,预测网络优化方案的覆盖情况,相比基于反复人工测试验证的网络优化方案,降低了优化周期和成本,可供类似场景的网络优化参考。

BOREL LINES OF RANDOM DIRICHLET SERIES

For some random Dirichlet series of order (R) infinite almost surely every horizontal line is a Borel line of order (R) infinite and without exceptional values

Potential roles of EZH2, Bmi-1 and mi R-203 in cell proliferation and invasion in hepatocellular carcinoma cell line Hep3B

AIM: To investigate the potential roles of enhancer of zeste homolog2(EZH2), Bmi-1 and mi R-203 in cell proliferation and invasion in hepatocellular carcinoma(HCC) cell line Hep3 B.METHODS: A total of 73 patients who underwent surgical resection at Fuzong Clinical Medical College of Fujian Medical University were enrolled in this study. Hep3 B cells were cultivated in RPMI 1640 medium supplemented with 10% fetal bovine serum at 37?℃. Vectors that containing c DNA of the EZH2 gene or mi R-203 targeted sh RNA plasmid were constructed, and then transfected into Hep3 B cells. The m RNA expression of mi R-203, EZH2, and Bmi-1 was analyzed using quantitative real-time polymerase chain reaction analysis, and the protein levels of EZH2 and Bmi-1 were detected by Western blot analysis. Effect of EZH2 or mi R-203 on cell proliferation was observed by methyl thiazolyl tetrazolium assay, and cell apoptosis was assessed using flow cytometry. Besides, effect of EZH2 or mi R-203 on tumor cell invasion was detected using Transwell assay.RESULTS: The m RNA levels of EZH2 and Bmi-1 in HCC tissues and in Hep3 B cells were significantly higher compared with those in normal samples(P < 0.01), while mi R-203 level was significantly lower in HCC tissues(P < 0.01). Hep3 B cells transfected with EZH2-sh RNA or mi R-203-sh RNA showed lower expression levels of EZH2 and Bmi-1(P < 0.05). Compared with controls, Hep3 B cells transfected with EZH2-sh RNA had relative slow cell proliferation, indicating that low expression of EZH2 and Bmi-1 and overexpression of mi R-203 could inhibit Hep3 B cell proliferation(P < 0.05). The average apoptosis rate of Hep3 B cells transfected with EZH2-sh RNA vector was about 18.631%, while that of Hep3 B cells transfected with sh RNA vector was about 5.33%, suggesting that EZH2 was down-regulated by transfecting with EZH2-sh RNA, and the down-regulated EZH2 contributed to the cell apoptosis. Low expression of EZH2 and Bmi-1 and overexpression of mi R-203 could reduce Hep3 B cell invasion(P < 0.05).CONCLUSION: Our study suggests that EZH2 and Bmi-1 are up-regulated while mi R-203 is downregulated in Hep3 B cells. Mi R-203 may contribute to the metastasis and enhance apoptosis of HCC cells by regulating EZH2 and Bmi-1. Our study may provide a theoretical basis for metastasis of HCC and targeted therapy of HCC.

Improved Ligand-Field Theoretical Calculations of R-Line Thermal Broadenings of MgO:Cr^(3+) and MgO:V^(2+)

With the values of parameters obtained from improved ligand-field theory,by taking into account all theirreducible representations and their components in EPI as well as all the levels and the admixtures of basic wavefunc-tions within d^3 electronic configuration,the R-line thermal broadenings(TB)of both MgO:Cr^(3+)and MgO:V^(2+)havemicroscopic-theoretically been calculated.The results are in very good agreement with the experimental data.It is foundthat the R-line TB of MgO:Cr^(3+)or MgO:V^(2+)comes from the first-order term of EPI.The elastic Raman scattering ofacoustic phonons plays a dominant role in R-line TB of MgO:Cr^(3+)or MgO:V^(2+).

Pressure-Induced Shifts of R1 and R2 Lines of YAG：Cr3＋

<正> By means of improved ligand-field theory,the'pure electronic'pressure-induced shifts(PS's)and thePS's due to electron-phonon interaction(EPI)of R_1 line and R_2 line of YAG:Cr~(3+) have been calculated,respectively.The calculated results are in very good agreement with the experimental data.It is demonstrated that the admixtureof|t_2~2(~3T_1)e~4T_2〉and|t_2~(32)E〉bases in the wavefunction of R_1 level of YAG:Cr~(3+) and its change with pressure play a keyrole for the PS of R_1 line.The behaviors of the'pure electronic'PS of R_1 line and the PS of R_1 line due to EPI aredifferent.It is the combined effect of them that gives rise to the total PS of R_1 line,which has satisfactorily explainedthe experimental results.The systematic analyses and comparisons between the feature of R_1-line PS of YAG:Cr~(3+) andthe ones of three laser crystals(GSGG:Cr~(3+),GGG:Cr~(3+) and ruby)have been made,and the origin of the differencebetween them has been revealed.

Improved Ligand-Field Theoretical Calculation of R-Line Pressure-Induced Shift of MgO:V^(2+)

By means of an improved ligand-field theory,the'pure electronic' PS and the PS due to EPI of R line ofMgO:V^(2+) have been calculated,respectively.The calculated results are in very good agreement with the experimentaldata.The behaviors of the pure electronic PS of R line of MgO:V^(2+) and the PS of its R line due to EPI are different.Itis the combined effect of them that gives rise to the total PS of R line,which has satisfactorily explained the experimentalresults.The mixing-degree of [t_2~2(~3T_1)e ~4T_2〉and [t_3~2 ~2E〉 in the wavefunction of R level and its variation with pressurehave been calculated and analyzed.The comparison between the feature of R-line PS of MgO:V^(2+) and that of MgO:Cr^(3+)has been made.

A Line Search Algorithm for Unconstrained Optimization

It is well known that the line search methods play a very important role for optimization problems. In this paper a new line search method is proposed for solving unconstrained optimization. Under weak conditions, this method possesses global convergence and R-linear convergence for nonconvex function and convex function, respectively. Moreover, the given search direction has sufficiently descent property and belongs to a trust region without carrying out any line search rule. Numerical results show that the new method is effective.

Pressure-Induced Shifts of R, R＇, and B Line-Groups and Ground-State Zero-Field-Splitting of Ruby

By means of improved ligand-field theory, the 'pure electronic' presure-induced shifts (PS's) and the PS's due to electron-phonon interaction (EPI) of the R1, R2, B1, B2, B3, and R'3 lines and the ground-state zero-field-splitting of ruby have been uniformly calculated. The calculation results are in very good agreement with all the experimental data. At normal pressure, ruby is a crystal with very strong crystal field. Thus, the admixture of |t22 (3T1)e4T2> and |t3 2 2 E> bases in the wavefunction of R1 level of ruby is small at normal pressure, and it gradually decreases with increasing pressure, which causes the R1-line PS of ruby to monotonously red shift with approximate linearity. The combined effect of the pure electronic PS of R1 line and the PS of R1 line due to EPI gives rise to the total PS of R1 line. The analyses and comparisons among the features of R1-line PS's of three laser crystals (ruby, GSGG:Cr3+ and GGG:Cr3+ ) have been made, and the origin of their difference has been revealed.

基于Cascade R-CNN的输电线路关键部件识别

针对无人机在输电线路关键部件巡检图像中目标多,且尺度相差较大,导致识别率低的问题,提出使用深度学习目标检测算法Cascade R-CNN进行识别。由于输电线路关键部件无公开数据集,采集输电线路关键部件图片,并将图片数据的分辨率进行统一,使用LabelImg软件进行标注,制作一个符合训练要求的数据集。基于Paddle框架进行模型搭建,使用PaddleDetection训练工具进行全流程训练调优,进行测试。实验结果表明,基于Cascade R-CNN算法的模型在进行目标尺寸相差较大的多目标检测时,在测试集上的精度(mAP)可以达到91.39%,检测效果较好。

基于R语言ARIMA模型的配电线路故障跳闸预测与研究

作为电力系统的重要组成部分,配电线路的故障跳闸对供电质量和用户正常用电产生了显著影响,因此,准确预测配电线路的故障跳闸情况,对提高电力系统的可靠性和稳定性具有重要意义。为此,本文基于R语言中的ARIMA模型,预测与研究了配电线路的故障跳闸。研究表明,预测模型具有较高精度,能提高配电线路的运行效率和故障处理能力,满足实际工程应用要求。

磁东线GSM-R网络优化技术分析与总结

随着近年来中国高速铁路的蓬勃发展以及普速铁路的升级换代,GSM-R在中国铁路通信系统中发挥着越来越重要的作用。网络优化作为GSM-R工程建设的重要环节,直接影响网络覆盖合格与否。文章以磁东线铁路工程施工为例,对GSM-R网络测试中发现的典型问题进行了梳理分析,给出了相应的解决对策,并对网络优化技术经验进行了归纳总结,为类似的工程问题解决提供相关参考。

边缘算法优化Faster R-CNN算法下的输电线路缺陷识别方法

为提升输电线路缺陷识别效果,研究了一种利用边缘算法优化Faster R-CNN算法的输电线路缺陷识别方法。通过无人机采集输电线路图像,采用极值中值滤波算法降噪,输入Faster R-CNN模型,提取缺陷特征,利用RPN网络确定目标候选区域;利用边缘算法优化Faster R-CNN算法以确定像素点梯度幅值,并抑制非极大值;训练模型,完成输电线路缺陷识别。测试结果显示,该算法能够提升各主要缺陷类别的识别准确率,准确率达85%以上。

非C3线路GSM-R网络质量自动评估系统及其应用

在非C3线路GSM-R网络维护过程中,故障分析和网络优化工作缺乏大量有效的监测数据支撑。当怀疑网络问题时,除了利用每月一次的电务检测车数据外,经常需要安排人员前往现场进行路测,人员工作量大,数据时效性差。为解决此问题,提出基于车载自动拨测设备的GSM-R网络质量自动评估系统解决方案:通过在部分非C3线路运行的机车上加装车载自动拨测设备,与地面拨测控制平台配合,自动进行电路域CSD拨测或分组域GPRS数据测试;综合利用拨测和测试结果数据、Abis接口监测数据、Gb接口监测数据,经统计分析和深度挖掘,方便维护人员及时掌握非C3线路的网络覆盖和通信质量状况,并实现基站性能评估算法,可以尽早发现基站性能恶化趋势,为故障分析和网络优化工作提供数据支撑。

大豆RN不育胞质不育与恢复类型的研究

阐述了以RN不育细胞质为基础选育的细胞质雄性不育系和恢复系的类型。在大量测交以及预备试验的基础上,选择具有代表性的9对不育系和相应的保持系以及10个恢复系,进行不育系与所有保持系之间,以及不育系与所有恢复系之间所有可能的杂交。对不育系与恢复系杂交的F1,依据花粉败育率分为3类以表示恢复度,A类:败育率0～10%,B类:败育率11%～60%,C类:败育率61%以上。再依据这3类的分布情况和恢复谱,对不育系和恢复系进行分类。结果表明:任何一个保持系均可保持所有不育系,保持不育性的遗传机制较为简单,受隐性单基因控制。不育系分为极易被恢复,易被恢复和不易被恢复3类。依据恢复谱和恢复度将恢复系分为:强恢复,恢复和弱恢复3类。极易被恢复的不育系和强恢复系是大豆杂交种选育中的珍贵育种材料。由于育性的恢复比较复杂,测交中最好同时用上述3类不同类型的不育系做测交母本。