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无线传感器网络通过各类集成化的微型传感器协作地实时监测、感知和采集各种环境或监测对象的信息;而智能家居系统的设计是要在家庭内部以家庭总线的方式构建一个相当于住宅神经的家庭控制网络。本文把无线传感器网络引入到智能家居中,完成智能家居系统中主控模块、传感器模块的硬件设计,探讨基于无线传感器网络的智能家居系统的设计。 相似文献
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本系统是基于物联网的无线智能家居仿真系统的设计,融合了无线传感器技术、嵌入式技术、短距离通讯技术、工业控制技术等一系列新技术。提供了功能齐全的2．4G无线射频硬件开发平台,利用CC2430作为系统开发的片上系统,使用基于IEEE802．15．4协议规范的协议栈。该平台的无线模块和传感器模块可以相互组成一个无线传感器网络,所有节点之间可以建立包括所有无线网络协议（zigBee、WSN基础协议）在内的多种无线网络协议。网关节点可将传感器采集的数据直接通过串口发送给主机,或将数据通过WIFI、以太网,GPRS、3G等方式发送到远程服务器。用户可以根据实际应用需求选择传输方式。 相似文献
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基于无线传感器网络(WSN)通信的研究,设计了一种用于智能家居的用电监测终端。该终端的采集器节点采集室内用电设备的能耗参数,利用CC1100射频模块在IEEE 802.15.4协议基础上实现WSN自组网。采集到的能耗参数通过无线传感器网络(WSN)上传至信息集中器,用户可以通过互动界面使用用电监测管理系统,直观的了解家庭中的每个设备用电状况。在最后,总结了所设计的用电监测终端的相关经验,指出了它的局限性,同时对未来改进工作提出展望。 相似文献
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本设计采用32位嵌入式AR M处理器stm32f103vb作为智能家居控制系统的核心控制器,结合嵌入式操作系统,使智能家居控制系统的应用开发变为在嵌入式平台上的二次开发,从而缩短开发周期,并且节约资源。针对智能家居系统的特点和所要实现的基本功能,分析了智能家居控制器的基本结构,然后对各个模块电路进行了详细设计。最终利用人体红外传感器(infraredsensor)、HC06蓝牙模块、温湿传感器模块、烟雾传感器(MQ-2)、继电器、摄像头等,结合电路组装成系统,实现房屋的无线监控。 相似文献
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为提高农业环境监测的有效性和实时性,设计一种结合计算机嵌入式技术与无线传感器网络结合的现代化监测系统,系统主要包括无线传感器网络系统、嵌入式终端、监测节点等模块,具有实时采集水质信息,土壤温湿度,二氧化碳浓度的功能。仿真测试结果表明,系统能够实时监测,减少了人工干预,保证自动化管理。 相似文献
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文章提出一种适用于无线局域网的新型小型化宽带天线。该种天线能在所需的频带产生相应的谐振模式,能完全覆盖5-GHz无线局域网频段。该天线采用同轴馈电并印刷在FIK4介质基片上。天线结构应用Ansoft HFSS软件进行设计和优化仿真,仿真结果显示：天线在IEEE802．11a无线局域网频段带宽为3．69GHz,而且在频带... 相似文献
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基于nRF24LE1和MMS的智能家居监测系统 总被引：2，自引：0，他引：2
挪威Nordic半导体公司最新推出世界上最小、集成度最高的单片超低功耗2．4G射频系统芯片nRF24LE1,可用它来构建智能家居监测系统的无线传感器网络。摄像头采用简单灵活的无线多节点安装方式,和传感器一起受节点nRF24LE1控制。在节点nRF24LE1的控制下,拍摄的图像和其他监测数据高速发送给主机。主机nRF24LE1控制GPRS模块以MMS（彩信）形式向用户手机发送遇警或主动监测数据。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 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
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《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
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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
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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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
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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
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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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