基于ARM的液位自动控制实验系统   总被引：1，自引：1，他引：0  

管凤旭  谭吉来  吕淑萍 《实验室研究与探索》2010,29(3)

为提高嵌入式控制系统设计课程质量,研制一种水箱液位自动控制系统。系统由ARM7S3C44B0X、液位检测模块、直流水泵驱动模块、电源模块以及LCD显示模块等组成。首先采用电阻式液位检测模块获取液位高度脉冲频率信号,根据在单位时间内获取外部中断信号的次数确定液位高度,最后通过PID控制算法计算,经定时器产生PWM波信号控制直流水泵输出的流量。介绍了硬件电路和软件设计过程。研制的实验装置制作简单、成本低廉,并取得了良好的教学效果。  相似文献   

The wider impacts of high-technology employment: Evidence from U.S. cities     

Tom Kemeny  Taner Osman 《Research Policy》2018,47(9):1729-1740

Innovative, high-technology industries are commonly described as drivers of regional development. ‘Tech’ workers earn high wages, but they are also said to generate knock-on effects throughout the local economies that host them, spurring growth in jobs and wages in nontradable activities. At the same time, in iconic high-tech agglomerations like the San Francisco Bay Area, the home of Silicon Valley, the success of the tech industry creates tensions, in part as living costs rise beyond the reach of many non-tech workers. Across a large sample of U.S. cities, this paper explores these issues systematically. Combining annual data on wages, employment and prices from the Quarterly Census of Employment and Wages, the Department of Housing and Urban Development and the Consumer Price Index, it estimates how growth in tradable tech employment affects the real, living-cost deflated wages of local workers in nontradable sectors. Results indicate that high-technology employment has significant, positive, but modest effects on the real wages of workers in nontradable sectors. These effects appear to be spread consistently across different kinds of nontradable activities. In terms of substantive wider impacts, tech appears benign, though fairly ineffectual.  相似文献   

Nonlinear capital market payoffs to science-led innovation     

Houdou Basse Mama 《Research Policy》2018,47(6):1084-1095

This study explores the extent to which cross-sectional differences in firms’ propensity to absorb and utilize scientific knowledge matter for their stock market and operating performance. Unlike previous empirical studies and given the coexistence of both benefits and potential costs to science-guided search, I conceptualize innovation as a recombinant search to hypothesize a non-monotonic relationship. Using patent data from the European Patent Office (EPO) relative to 3281 international firms over the 1999–2015 period, empirical tests yield evidence in support of the predictions. However, the effect varies with firm-level absorptive capacity, across industries and countries. As suggested by a limited attention model, I find a stronger payoff predictive power of science for firms with lower investor attention and higher valuation uncertainty. Besides, the association between science and future operating performance increases with time, indicating that firms’ scientific capabilities are a potent driver of long-term profitability. The conclusions are robust to controlling for the endogenous nature of firms’ use of scientific knowledge. By providing a useful basis upon which to judge the economic merit of firms’ innovation endeavors, this study contributes to reducing capital market imperfections that curtail access to external finance and ultimately spurring private-sector investment in R&D. It also provides evidence of diminishing marginal payoffs to science-led search. Finally, the evidence is likely to be relevant to policymakers, who might wish to influence the innovation ecosystem in a way to sustain long-term prosperity.  相似文献   

对中原工学院女篮参加第11届CUBA西北赛区比赛的分析研究     

张冯 《辽宁体育科技》2010,32(2):55-57

采用技术统计、数据分析和归纳整理等方法,对中原工学院女子篮球队在第11届CUBA大学生篮球联赛中各项技术指标进行分析研究,并与其他9支队伍进行对比,结果发现：中原工学院女子篮球队作为一支年轻队伍在本次比赛中有了很大的进步;在得分、助攻等方面有了较大提高。但仍旧存在很多问题：成绩不稳定,发挥起伏较大;队员心理素质欠佳;防守能力较差等。  相似文献   

第11届全运会男子篮球运动员身体形态的比较分析     

王国咏  黄艺青  刘太磊 《辽宁体育科技》2010,32(3):38-40

运用文献资料法、数理统计法等,对第11届全运会男子篮球比赛前8名球队运动员身体形态进行比较分析,结果显示：运动员未表现出身高越高,体重越大,但是其克托莱指数与体重却保持着相同的变化趋势;另外,运动员的身体形态特征存在着明显的个体差异。  相似文献   

基于蓝牙的嵌入式无线数据采集系统的设计     

冯军 《黑龙江科技信息》2010,(12):23-23

这里提出一种基于蓝牙技术的无线数据采集系统并且给出了系统总体结构,说明了各个模块的功能及作用,最后详细介绍了软、硬件的设计实现。  相似文献   

ARM在嵌入式Linux网络通信平台中的应用   总被引：1，自引：0，他引：1  

卢宁宁 《科技风》2010,(1)

ARM虽然不是洼能最好的租SC处理器,但是非常适合于应用在嵌入式系统中,而且Linux对ARM有很好的支持,移植Linux到ARM平台是性价比较高的嵌入式解决方案.  相似文献   

Applying open innovation in business strategies: Evidence from Finnish software firms     

Elad Harison  Heli Koski 《Research Policy》2010,39(3):351-359

Our study aims at shedding light on the innovative business strategies in the software sector and understanding better the economics that underlies the supply of Open Source Software (OSS). We use survey data collected from 170 Finnish software companies to investigate how different properties of software firms, such as size, age, intellectual capital, absorptive capacity, and ownership structure affect their decisions to base their business strategies on OSS supply or proprietary distribution of products and services.Our empirical findings indicate that the adoption of technologically advanced strategies requiring complex legal and managerial knowledge, such as the OSS supply strategy, demands relatively highly educated employees. The support for and development of an education system providing highly skilled people from different fields are essential for the firms’ successful adoption of innovative business strategies. We also find that market entrants have largely driven the OSS adoption, but there are no significant age-related differences in the adoption behavior of incumbent software firms.  相似文献   

Understanding the development of technology-intensive suppliers in resource-based developing economies     

Carlos Torres-Fuchslocher 《Research Policy》2010,39(2):268-277

The development of local technology-intensive suppliers (t-suppliers) may contribute to both reinforcing the industrial base and supporting the competitiveness of primary production in developing countries. This article explores the role of t-suppliers in natural resource-based economies and outlines a theoretical framework for the analysis of the factors which foster or constrain their development and defines areas for an effective promotion. The proposed model of analysis distinguishes between factors influencing the development of t-suppliers on the level of the main industry, the level of supplier firms or firm-level and the level of external determinants with special reference to industrial policy factors.  相似文献