基于ROC曲线的镜片舒适度眼动指标研究

基于眼动仪检测到的受试者眼动数据,提出一项新的眼动指标——眼睑间距变动百分比,并对比传统的眼跳次数、瞳孔直径等眼动指标,经过显著性和相关性分析后,最后利用受试者特征曲线（Receiver operating characteristic,ROC）曲线评价每个眼动指标对镜片舒适度的判别性能。实验结果表明,本文提出的眼睑间距变动百分比反映镜片舒适度的性能最好,瞳孔直径次之,眼跳次数和平均注视时长相仿。本实验结果证明可以通过检测患者的眼睑间距变动百分比,来准确快速地判断镜片的舒适程度。这项研究成果能帮助相关从业者从更加客观的角度评价镜片的舒适程度,也为中国当前日益严峻的近视防控形势提供了一定的技术理论帮助。     

基于GA-ANN模型的A2/O工艺运行参数优化

影响A~2/O工艺运行的参数有许多,这些因素相互联系、相互作用,影响工艺效率.为了弥补控制单一变量法或者设计正交试验法的不足,综合考察多种运行参数对工艺运行效果的影响,建立了基于遗传算法进行全局寻优的神经网络模型(GA-ANN模型),并应用于某城市污水处理厂A~2/O工艺的运行优化.获得该厂调试运行期间154组有效监测数据后,随机选取2/3的数据用于GA-ANN模型的求解,1/3的数据用于模型的检验,对工艺运行参数进行优化,得到最佳运行参数组合.结果显示,建立基于遗传算法的神经网络模型用于A~2/O工艺运行参数的优化是可行的,可以为污水处理厂运行参数的设置提供理论参考,对调试工作、提高工艺运行效率具有一定的实际指导意义.     

基于Linux的ARM与FPGA数据通信设计与实现

ARM与FPGA是目前应用于嵌入式开发的两款主要芯片,ARM偏向于控制领域,而FPGA偏向数据处理。为实现两者的协同工作以及数据通信,介绍了一种通信接口方案的设计与实现。在ARM上运行嵌入式Linux系统的情况下,将FPGA作为字符设备,对两者之间的接口进行驱动程序开发,包括数据总线驱动和GPIO控制驱动。用户应用程序通过调用驱动中定义好的操作函数,便可实现两者的数据通信。最后利用自定义的通信方案对接口进行测试,实现了ARM对FPGA设备的命令控制以及正确稳定的并行数据传输。     

产教融合前提下《Linux操作系统》课程的改革与研究

文章分析了《Linux操作系统》课程传统教学方法的弊端,提出多种方法相结合的教学手段,达到专业设置与岗位技能、课程内容与职业标准、教学过程与生产过程“三对接”.     

RTOS在数字化焊接电源中的应用前景

定义了嵌入式操作系统，分析了在数字化焊接电源中采用RTOS(Real Time Operating System)的必要性。结合焊接电源的特点，阐述了在数字化焊接电源的开发中引入RTOS的优点，探讨了数字化焊接电源开发中应用RTOS的可行性。分析表明，RTOS在数字化焊接电源中具有广阔的应用前景。     

片簧冲孔切边双工位模具设计

介绍了某车型片簧冲大孔、切边双工位模具设计要点及注意事项。经生产验证,该模具结构合理,使用后提高了生产效率,降低了生产成本,具有一定的推广价值。     

管线钢多丝埋弧焊烧结焊剂焊接工艺性能研究

对管线钢用多丝埋弧焊烧结焊剂主要组分对焊接工艺性能的影响规律进行了试验研究．在此基础上研制出一种基于MgO-CaF2-Al2O3-SiO2-MnO-ZrO2渣系、碱度BⅡw在1．2～1．5之间的新型烧结焊剂。试验表明．该焊剂在多丝埋弧焊时具有良好的焊接工艺性能，焊接接头各项力学性能均能满足X70级管线钢的焊接要求。     

Flame-Sprayed Glaze Coatings: Effects of Operating Parameters and Feedstock Characteristics Onto Coating Structures

Many substrates do not sustain the conventional glazing process (i.e., vitreous glazing) due to the relatively high temperature required by this treatment (i.e., up to 1400 °C in some cases) to fuse glazes after their application on the surface to be covered. Flame spraying could appear as a solution to circumvent this limitation and to avoid thermal decomposition of substrates. This contribution describes some structural attributes of glaze coatings manufactured by flame spraying. It also discusses the influence of the feedstock powder morphology and some of its physical properties on coating characteristics. This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007.     

Digital arc welding power supply based on real-time operating system

A digital arc welding power supply was designed with the advanced reduced instruction set computer machine （ARM） and embedded real-time multi-task operating system micro C/OS- Ⅱ. The ARM, with its powerful calculating speed and complete peripheral equipments, is very suitable to work as the controller of the digital power supply. The micro C/OS- Ⅱ transplanted in ARM, helps to improve the respondent speed against various welding signals, as well as the reliability of the controlling software. The welding process consists of nine tasks. The tasks of great significance on reliability of the welder, for example, the A/D conversion of current and voltage, enjoy top priority. To avoid simultaneous-sharing on A/D converter and LCD module, two semaphores are introduced in to ensure the smooth performance of the welding power supply. Proven by experiments ,the ARM and the micro C/OS- Ⅱ can greatly improve both the respondent speed and the reliability of the digital welder.     

基于Simics的嵌入式系统的研究与开发

以Vx Works 6.9嵌入式操作系统为例,论述了在风河Simics全系统仿真环境下进行嵌入式操作系统的bootrom开发、操作系统的定制、设备驱动和应用程序的开发方法,探究出了利用Simics全系统仿真环境协助开发者进行嵌入式操作系统底层软件、中间层软件和上层应用软件开发的新方法。