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1.
本文设计一个智能报警系统,将短距离无线传输与GSM远程通信相结合,实现多个房间的远程报警。当监控场所发生紧急情况(盗窃、气体泄漏等)时,通过无线传输模块向主机发送报警信号。主机现场发出声光报警,并通过GSM向户主发送短信息实现远程报警。当有多个房间报警时,在用户短信息中能显示出报警的房间号和报警类型。 相似文献
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为了保障家庭的安全,最大可能地降低入室偷杀抢事件的发案率和危害,提出了一种能识别语音密码并能紧急报警紧急求助的高性价比的通过LabVIEW虚拟仪器图形化软件技术来实现家庭智能报警的系统。从探测器中可以读取报警信号,判别出是误报还是确实有险情,若确有险情发生将采集案发现场的图像发送到显示终端并向用户指定地点发送报警指令。 相似文献
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温度是影响众多生产生活中的主要外界因素,智能温度报警系统是一款基于STC89C52单片机的一种温度测量及报警系统,该系统采用DS18B20作为温度监测元件,并利用LCD实时显示数据,并通过设置温度上下限,当温度不在设置范围内时利用扬声器自动发出报警信号。本文主要注重于该系统的硬件组成方面,通过介绍系统的设计方案以及方案分析,实现温度的采集与报警,结构简单,易于控制,系统可靠性高,可应用于工农业的温度控制。 相似文献
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设计了一种基于DSP的火灾报警系统,以DSP为核心,将传感器采集到的烟雾浓度和温度与设定参考值进行比较来判断是否发生火灾。并通过CAN总线将火灾发生信号传送给控制中心,实现了火灾预警的智能化、集中化。 相似文献
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本文设计了基于ZigBee的无线传感器网络的池塘水域水质监测系统,采用STC89C52单片机作为节点主控芯片,节点定时采集并发送水质数据到上位机,上位机把接收到的数据分类存储,设计还利用VB6.0软件开发了监控软件,非常有利于查看所监测的水体的历史情况这对养殖经验的提升是有很大帮助有。本文所设计的池塘水质监控系统可以满足池塘自动调节溶解氧含量和温度的需求,对于PH值情况可提供报警,系统对中小养殖户来说比较实用且能提高生产效益。 相似文献
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近些年来,火灾事故在不断增加,严重危害了人们的生命财产安全,人们也逐渐重视防火工作的重要性。而火灾自动系统作为消防设施的重要组成部分,被各个场所广泛的应用,这种火灾自动报警系统能够在火灾发生时及时传输报警信号,使人群可以及时进行疏散,为消防人员创造宝贵的救火时间,将损失降到最低。因此,本文针对无线火灾自动报警系统的可行性研究进行分析探讨,结合目前无线火线自动报警系统中存在的问题做出具体阐释,并提出一系列相关有效的改善措施。 相似文献
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主机遥控装置一般由两个系统组成,即监测系统和控制系统。控制系统多采用单片机,每套系统控制一台柴油机,在电路上相互独立,互不影响的结构提高了控制系统的可靠性。监测系统也常采用单片机,它负责每台主机运行参数的监测、显示、报警、打印等功能。维修时将其分为五个独立系统进行,首先观察和了解故障现象,其次分析与故障相关部件的原理,并结合故障现象推测和确定故障点,最后着手排除故障。 相似文献
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根据前期对九寨沟景区运行现状的仿真模拟以及对景区旺季客流的时空变化特征的分析,得出无论从时间还是从空间上来说,景区内各景点旅游负荷均呈现出不均衡的状态。进一步的研究分析发现,导致这一后果的主要原因之一在于,系统处于初态时对于景区内游客的分流措施不得当。为此,本文提出采用聚类分析法对景区内景点进行聚类,确定初态分流区域及其分流比例,作为初始方案,并建立数学模型,使用LINGO软件求解,结果表明,车辆在各分流区域的分配比例基本符合按照区域容量所求出的初态分流比例,这为后期的稳态和终态时空分流导航研究奠定了基础。本文的研究是达到总目标:整个系统内各景点负荷均衡,提高景区游客旅游价值,实现景区生态保护与经济的协调发展所不可或缺的步骤。 相似文献
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安雪松 《内蒙古科技与经济》2013,(5):113+115
全面论述了智能建筑管理系统的概念及其在智能建筑的应用情况;并主要介绍了在场馆应用中的楼宇自控系统、电视监控系统、入侵报警系统、巡更系统、出入口控制系统、停车场系统、一卡通系统、公共广播与背景音乐系统、火灾自动报警系统、大屏信息发布系统监测内容等。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
13.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
14.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
15.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
16.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
17.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
18.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
19.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
20.
Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献