基于嵌入式ECOS纺织控制器的设计与实现

本文提出了一种嵌入式纺织控制系统的设计方案。本系统以EP9315为处理核心,ARM ECOS为操作系统平台构建了嵌入式纺织控制系统的软硬件平台。简要介绍了其硬件结构,详述了软件系统的设计与实现。     

一种嵌入式浏览器中的HTML解析器的设计

本文主要介绍了一种HTML解析器的设计,以及其在数字电视机顶盒中的实现;另外还简述了CSS层叠样式表技术在嵌入式浏览器中的实现。     

基于脉搏检测与无线传输系统的设计

结合嵌入式与无线通信技术,提出了一种基于嵌入式无线脉搏传输与检测系统的方法。该方法能对人体脉搏波动态参数进行采集和分析,主要利用下位机通过SC0073动态微压传感器提取脉搏信号,通过嵌入式Atmega8515处理器对脉搏信号进行处理,然后通过无线收发模块NRF905远距离无线传送,并在电脑上采用LabVIEW界面直观的显示人体检测部位温度、脉搏波形信号的时域特性与频域特性,还能够通过开启远程监控系统对人体脉搏的数据进行分析,可以使医生完成远程在线诊断。     

Changes in implicit theories of ability in biology and dropout from STEM majors: A latent growth curve approach

This longitudinal study was designed to investigate the associations between changes in implicit theories of ability in biology and college students’ dropout from STEM majors. We modeled the one-year growth patterns of entity and incremental beliefs about ability in biology with 4 time points of self-reported data and two covariates—biology domain knowledge and inference making and gateway course grade, and predicted STEM dropout with the growth trajectories of implicit theories. Results indicated that students’ entity beliefs increased, while incremental beliefs decreased over time, which provides support for the changeability of implicit beliefs over a short period of time. The growth of incremental beliefs was directly associated with STEM dropout above and beyond biology course grade and biology domain knowledge and inference making. Low intercept and negative slope of incremental beliefs predicted leaving STEM majors; however, the decline of entity beliefs did not have significant effects on dropout. Interestingly, the effect of biology domain knowledge and inference making on STEM dropout was mediated by biology course grade and incremental beliefs. The findings imply the importance of monitoring changes in students’ implicit beliefs and gateway course achievement in order to better understand and promote STEM retention.     

A Foot in the Door

Abstract

The Houston Community College System (HCCS) is one of the largest community colleges in the nation, serving over 52,000 students. Though there is no dedicated full-time distance education (DE) librarian at HCCS, “traditional” librarians are meeting the needs of a rapidly growing population of DE and hybrid students by adapting to new roles and applying technology in innovative ways. An adventuresome cadre of information professionals has been reaching out to students to engage them where learning takes place. These “virtual librarians” are embedded in Web-based courses in order to promote library services to students who may never set foot in a HCCS campus library. As DE enrollment continues to expand, however, it has become necessary to consolidate efforts, and this is being accomplished through the utilization of a Web log (blog) and syndication tools, as well as some additional free applications.     

基于Zigbee技术的葡萄生长监控系统设计

本次设计采用无线传感器网络,利用Zigbee技术,设计葡萄生长环境监控节点。该节点具有较强的通信处理能力,能够对传感器采集的数据进行运算和传输至上位机,进而通过对水阀开启时间的控制来实现对土壤含水率的精确控制,以达到对葡萄生长过程进行精确控制的目的。     

基于ARM平台的引导程序分析与移植研究

以S3C2440处理器和嵌入式Linux为平台,对嵌入式系统中的引导程序vivi进行分析和移植研究,总结了vivi在S3C2440A处理器上的移植方法和步骤,通过了具体测试,取得了较好效果。     

Nand Flash启动模式下的Uboot移植

BootLoader移植是嵌入式系统开发中的一个重要环节,而Uboot是一个支持多处理器多操作系统较为通用的BootLoader。分析了Uboot的启动过程,并对s3c2440A如何支持驱动代码在外部NandFlash上的执行,以及在s3c2440A平台上如何实现NandFlash启动模式下的Uboot移植进行了介绍。具体操作和编译在fedora9操作系统和arm—linux-gcc4．3．2交叉编译下完成。     

嵌入式高温沸腾炉控制系统设计

基于单片机的高温沸腾炉控制系统已经成型。现利用SPCE3200嵌入式系统促其升级,加强系统集成度,传感器数据可以无线传入。采用液晶显示器显示工艺曲线,并允许通过触摸屏手工修改曲线,增加了多媒体、通信等功能,系统更加安全可靠,具有高适应性、易扩展性,有助于生产质量的提高。     

嵌入式图形环境和Web浏览器的设计与移植

随着信息技术（IT）的飞速发展,特别是互联网（Internet）的迅速普及以及3C（计算机、通讯、消费电子）合一的加速发展,宣告嵌入式联网时代己经来到我们的生活中．本文中将探讨如何在基于Intel Xscale PXA255嵌入式微处理器的Sitsang开发平台上实现嵌入式图形环境和Web浏览器的设计与移植．嵌入式图形环境和Web浏览器的设计和移植成功将有助于在嵌入式开发板上实现图形界面和Web浏览功能．本设计的实现对嵌入式Linux操作系统下从事嵌入式系统的开发,具有一定的借鉴意义和实用价值．