共查询到20条相似文献，搜索用时 15 毫秒
1.
实验室安防系统的设计 总被引：2，自引：0，他引：2
文中针对实验室防火防盗报警系统的局限性,提出一种基于电话网络为传送通道的智能自动安防系统,实现实验室的安全状况实时监控.采用单片机负责检测探测器信号的实时数据采集和处理,在有警情发生时启动以电话网为传输通道的报警模块进行自动拨号报警.该实验室安防系统具有结构简单、可靠性高、成本低等优点,因此具有较强的应用前景. 相似文献
2.
张博夫 《深圳职业技术学院学报》2009,8(5):26-30
介绍一种由单片机89C51、DTMF收发芯片MT8888、单片语音录放电路ISD1420构成的电话自动报警系统．应用MT8888的信号检测功能,分析了电话信道各种实际信号特点,实现信号的识别和被叫摘机的判断;应用MT8888的发、收功能,实现自动拨号报警和用户确认;应用ISD1420的语音录、放音功能,实现报警语音分段播放。 相似文献
3.
本文介绍一种通过公共电话网传递信息、用电脑进行控制的新型报警系统．文章对它的通讯性能进行了定性分析，并着重讨论了平均通讯时间和误报率等指标，设计出适合该系统的优化通讯．实验表明，这种设计方案是成功的． 相似文献
4.
Michele L. Ybarra David Finkelhor Kimberly J. Mitchell Janis Wolak 《Child abuse & neglect》2009,33(12):857-869
ObjectiveTo examine the relationship between the use of preventive software on the home computer and unwanted exposure to sexual material online.MethodsThe Youth Internet Safety Survey-2 was a national, RDD telephone survey conducted in March–June 2005. Eight hundred households (one caregiver and one child between the ages of 10 and 17 years) with home Internet access answered questions pertaining to Internet prevention activities in the household and adolescent behaviors and exposures online.ResultsUnwanted exposure to sexual material occurred in 32% of youth in homes with pop-up/spam blockers and 25% of youth in homes with filtering, blocking, or monitoring software on the home computer, compared to 43% of households without preventive software installed on the home computer. Among otherwise similar youth, pop-up/spam blockers installed on the home computer were significantly associated with 59% lower odds of reporting unwanted exposure to sexual material on the home computer; and filtering, blocking, or monitoring software was significantly associated with 65% lower odds. When data were stratified by youth sex, associations between preventive software and unwanted exposure were similar for boys and girls. When stratified by age, preventive software was associated with significantly reduced risk of unwanted exposure for 10–12-year olds and 13–15-year olds, but not for 16–17-year olds.ConclusionAlthough these correlational analyses are far from providing conclusive evidence that preventive software protects children from unwanted exposure to sexual material online, findings suggest that caregivers of boys and girls 15 years of age and younger who want to reduce the likelihood of unwanted exposure to sexual material on the home computer should consider including preventive software—especially filtering, blocking, or monitoring software—in their Internet safety plan.Practice implicationsPractitioners should partner with caregivers in developing an Internet safety plan, including proactive caregiver-youth discussions about expected Internet behavior appropriate for their household. 相似文献
5.
王宇 《绵阳师范学院学报》2007,26(2):124-127
WAP技术将Internet与移动电话技术结合起来,使随时随地访问丰富的互联网络资源成为现实。现代远程教育是指教、学双方准永久性分离、利用计算机及其网络技术把音、视频以及文本等课程信息传输到非课堂区域的一种教育形式。本文根据WAP技术及远程教育特点,提出了一套在远程教育中应用WAP技术的方案。 相似文献
6.
家电远程控制系统 总被引：1，自引：0，他引：1
刘彦华 《九江职业技术学院学报》2005,(3):19-20
本文介绍一种采用电话与电力载波相结合的通讯技术对家用电器进行远程控制的系统。主人可以通过电话遥控，对家庭的空调、热水器等电器进行控制。系统控制核心是单片机，信号的传输采用电力载波通讯技术。 相似文献
7.
《Early childhood research quarterly》2001,16(2):165-189
As increasing numbers of children enter child-care environments that are subsidized by federal and state funds, the demand has risen from policy makers and activists for valid, cost-effective methods of assessing the quality of those environments. In this study we asked whether data on child-care quality obtained from a telephone interview with the provider can serve as an adequate proxy for data obtained from direct observation. Observations were conducted in 89 family child-care homes and 92 centers using the Family Day Care Rating Scale (FDCRS) and the Early Childhood Environmental Rating Scale (ECERS-R), respectively. The target providers and teachers were subsequently interviewed by telephone using a protocol developed by the authors. For the family child-care providers, the 25 item telephone interview explained 49% of the variance (adjusted r2) in the total FDCRS score. Discriminant analyses revealed that the telephone interview was able to predict accurately 92% of the homes in terms of three FDCRS-derived categories of quality: “poor,” “mediocre,” or “developmentally appropriate.” For the centers, the 22 item telephone interview accounted for 51% of the variance (adjusted r2) in the total ECERS-R score. The telephone interview was able to predict the classification of 89% of the centers in terms of the ECERS-R derived categories of “poor,” “mediocre,” or “developmentally appropriate.” Shorter forms of the telephone interviews (12 items for family child-care; 13 items for center-based care) also demonstrated adequate predictive capability. These findings suggest that the telephone interview can be a valid source of data concerning the global quality of a child-care environment. 相似文献
8.
调制解调器在计算机网络飞速发展的今天得到了广泛的应用,本文介绍了调制解调器在端到端数据传输中所起的作用,阐述了利用公共交换电话网进行数据传输时影响调制解调器及端到端传输速度的因素. 相似文献
9.
起步不晚但起点较低的云南电大远程开放教育，应该根据自己的实际构建一种适应边疆，民族地区远程开放教育教学模式；省电大和分校要充分发挥各自的功能，共同的建一种学校采用以自学式文字教材为主，音像课，面授课为辅，电话咨询和计算机网站为补充的多种媒体和多种手段提供教学资源和学习支持服务；学生在教师指导下根据自己的实际 ，自行选择并组合适合自己的方式进行学习的远程开放教育教学模式。 相似文献
10.
《International Journal of Educational Research》1987,11(4):435-446
The major methodological, technological and technical issues of education data collection cited in the papers are discussed. These issues, when resolved, would improve the quality of the data collection process. Methodological issues explored include alternative data collection designs, inconsistencies in data element definitions, periodicity of collection, aggregation of data to the appropriate level, comparability, timeliness of reporting and modes of dissemination. Technological issues covered are the use of the telephone in data collection, the use of online computer access in data collection and computer assisted achievement testing. The technical issues of validity, reliability and completeness are combined and discussed as ‘inaccuracy’ problems. 相似文献
11.
张平 《扬州职业大学学报》2002,6(3):21-23
提出一种应用电话脉冲拨号芯片作为单片机应用系统键盘电路的实现方案 ,给出具体的接口电路以及相应的软件设计方法 ,达到了用最少的I/O资源 ,实现识别多个按键的目的 相似文献
12.
Karen A. Conklin 《Community College Journal of Research & Practice》2013,37(4):423-433
The rise to prominence of surveys by telephone has been attributed to advances in telephone technology, improvement of telephone research procedures, near complete accessibility of any population via the telephone, expansion of a survey industry that requires quality data generated in an efficient and timely manner for eager clients, and availability of considerable information, based on experiment and experience, on what techniques work or do not work when doing telephone surveys. This article details 10 years of experience with telephone survey methodology utilized at Johnson County Community College (JCCC) to collect data from business and industry, former students, and individuals residing in JCCC's service area. Of particular interest to community college researchers are the results of comparisons between mail survey respondents and nonrespondents who were later telephoned for an interview. These comparisons were conducted on results of annual studies of JCCC's career program completers. Although nonrespondents tended to be younger and more often male than female, there were no notable differences in the level of success and satisfaction reported. 相似文献
13.
IP电话设备主要采用H．323和MGCP协议实现,但是H．323和MGCP协议实现过程复杂,给实际使用造成很多的问题。本文提出一种采用PTD2112的FXS终端的实现方法,VoIP协议采用实现简单的SIP协议,同时也能够确保电话业务的服务质量,电话业务接口的技术性能指标满足相关规范要求。重点阐述了基于PTD2112的FXS终端的硬件与软件的设计方法。电话接口的性能测试结果表明,所提出的方案在因特网运行良好。 相似文献
14.
文光斌 《深圳职业技术学院学报》2014,(3):28-32
分析了三网融合和Intranet（企业内网）的发展现状及存在的问题,提出把企业内部的计算机网、电话网和电视网三网合一的观点,讨论了Intranet内实现三网融合的必要性、技术路线,阐述了三网融合综合接入端和终端的原理与组成,最后给出基于Intranet的三网融合的完整实现方法,并对基于Intranet三网融合与现有企业内部网络进行了比较. 相似文献
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16.
Martin Cawthorne 《Open Learning》2013,28(3):30-34
How can careers guidance, which in conventional institutions relies so much on personal contacts and the ability to browse through up‐to‐date information files, be adequately provided for distance students? Here, Martin Cawthome, Senior Counsellor in the Open University's West Midlands region and until recently chair of the Open University's Careers Information Research and Counselling Group, considers this question. Having outlined the stages involved in careers guidance, he reviews the use of printed materials, the telephone and computers, and looks forward to the possible improvements which computer systems may allow in the future. 相似文献
17.
主要探讨智能家居系统的子模块功能——智能安防报警系统,其工作原理为：以HT48R50A单片机为中央处理器,实现火警、烟警、液化气漏气报警、防盗拨号报警和语音报警.当有警情发生时可以拨号报警并通过报警电话时时监听,同时启动计算机进行网络监控. 相似文献
18.
本文介绍了一种多用途电话台灯线路 ,该线路具有夜间响玲或摘机时灯会自动点亮 ,挂机后延时一段时间自行熄灭 ,白天或有灯光时响铃或摘机不会启动台灯电路 ,平时可作普通调光台灯使用 ,同时能显示电话线路和话机的状态 ,防止有人挂线盗打电话等功能 相似文献
19.
BILLY V. KOEN 《European Journal of Engineering Education》1988,13(3):307-315
Study of the engineering method is important in order to understand our world. The environment of man is a collage of engineering problem solutions. Political alliances and economic structures have changed dramatically as a result of the telephone, the computer, the atomic bomb, and space exploration—all undeniably products of the engineering method. Look around the room in which you are now sitting. What do you find that was not developed, produced, or delivered by the engineer? What could be more important than to understand the strategy for change whose results surround us now and, some think, threaten to suffocate, to pollute, and to bomb us out of existence? This article redresses this situation by presenting a philosophically justifiable definition of Engineering Method that is gaining wide acceptance in the United States. 相似文献
20.
张改亮 《商丘职业技术学院学报》2007,6(4):44-46
手机短信文学同《诗经》在思想内容和艺术手法的运用上都有着许多相似之处,可以说,手机短信文学乃《诗经》优良传统的重归,是新时代对《诗经》的一种发扬,或者说《诗经》的影响在手机短信文学中得到了很好的体现。 相似文献