实时超声弹性成像弹性评分与谷草转氨酶—血小板指数诊断肝纤维化的价值

目的:探讨实时超声弹性成像(RTE)弹性评分及谷草转氨酶—血小板指数(APRI)诊断乙肝后肝纤维化程度的价值。方法:收集经病理证实肝纤维化程度的乙肝表面抗原阳性的患者79例。对79例患者行RTE检查,对所得图像进行评分,并与肝组织纤维化病理学分级及APRI对比。结果:相关分析显示肝纤维化程度与肝纤维化弹性成像弹性评分、APRI相关(r=0.721、r=0.524,均P<0.01)。肝纤维化弹性成像弹性评分诊断肝硬化的敏感度和特异度较APRI高,敏感度为71.4%,特异度89.4%,ROC曲线下面积较APRI大,为0.902。结论:实时超声弹性成像弹性评分可以对乙肝后肝纤维化程度进行初步的评定,有望成为诊断肝纤维化的无创性新方法。

基于C/S模式多层结构的在线岗位训练考试系统设计与Delphi/Access实现

数字化学习与考试环境建设是岗位数字化训练建设的核心内容。利用开发工具Borland Delphi7.0开发出适用于多岗位的在线训练考试系统。采用C/S模式多层结构,使用Access数据库,在中间层采用大量的远程方法设计供客户端调用,实现训练考试过程与管理的数字化、信息化和自动化。在线岗位训练考试系统是集数据库管理、随机选题与结果分析为一体,包含系统设置、考试、实时评分等功能模块,通过TCP/IP协议连接到考试服务器完成试卷提交和读取试卷。

土木工程测量仪器模拟操作软件及网络交互系统研究

在土木工程测量课程的教学过程中存在测量实践课时少、测量设备使用不均衡等问题。这些问题导致相当一部分同学在课内实验或课后实训环节,动手能力得不到系统训练。针对上述问题,结合现代高校网络教学,通过Flash动画及Actionscript3.0设计、编程,构建水准仪、经纬仪设备的软件模拟系统,利用软件模拟代替实物设备操作与训练,在此基础上建立测量基本操作实践网站,实现模拟软件共享,并对学生模拟操作过程实时监控、评分,使学生在软件环境下实现与硬件操作同等的训练目标,提高学生操作仪器的能力。

多语种在线考试系统关键技术研究

当前,单机模式和C/S模式考试系统的研究已有很多,但基于B/S模式的在线考试系统的相关研究还较少。本文分析了基于B/S模式的在线考试系统与传统的单机或C/S模式考试系统的不同特点,针对其安全性、可信性等方面的需求,设计了一种基于VBA文档特性对比算法、Javascript客户端文件加密传输技术的B/S模式在线考试系统,实现了试题和答卷的可靠/安全传输、身份认证、服务器端主观题(如计算机考试中OFFICE操作题)的实时自动评分、系统逐步扩展及对维文的支持等功能。特别是设计了一种基于脚本的网页维吾尔文输入方法,提供了具有良好用户体验的维文支持,这是当前考试系统较少考虑的,对少数民族地区普及考试系统是一次有益的探索。

Real-time lane departure warning system based on principal component analysis of grayscale distribution and risk evaluation model

A technology for unintended lane departure warning was proposed. As crucial information, lane boundaries were detected based on principal component analysis of grayscale distribution in search bars of given number and then each search bar was tracked using Kalman filter between frames. The lane detection performance was evaluated and demonstrated in ways of receiver operating characteristic, dice similarity coefficient and real-time performance. For lane departure detection, a lane departure risk evaluation model based on lasting time and frequency was effectively executed on the ARM-based platform. Experimental results indicate that the algorithm generates satisfactory lane detection results under different traffic and lighting conditions, and the proposed warning mechanism sends effective warning signals, avoiding most false warning.

Dynamic evaluation of traffic flows on city roads

This paper presents an analysis of the random fluctuations, deferred conduction effect and periodicity of road traffic based on the basic features of road networks. It also discusses the limitations of road network evaluation theories based on road "V/C". In addition, it proposes a set of theoretical and technical methods for the real-time evaluation of traffic flows for entire road networks, and for solving key technical issues, such as real-time data collection and processing in areas with no blind zones, the spatial-temporal dynamic analysis of road network traffic, and the calibration of key performance index thresholds. It also provides new technical tools for the strategic transportation planning and real-time diagnosis of road traffic. The new tools and methodology presented in this paper are validated using a case study in Beijing.

低代码可视化AI技术加速船舶焊接工艺智能化

在焊接质量分析及检测的智能化应用研究创新过程中,需要利用工业机理模型和分析方法进行可视化、低代码化和智能化构建。焊接工艺低代码可视化分析提供了一种基于机理模型的信号分析方法,可以帮助船舶制造行业解决焊接过程中的质量问题。该软件包括U-I相图、特征分析和短路专属分析等分析功能,以船舶发动机焊接为案例进行实证分析,结合U-I相图等由用户自主构建焊缝质量评分体系,将其封装为AI模型实现实时质量评分,验证了该软件对焊接质量分析和评估的有效性,提高了焊接质量评价效率和准确性。