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射频卡,又称非接触式IC卡,智能卡。它把计算机技术、射频技术与微电子技术结合到了一起,其小巧实用,性价比高。并已开始应用于金融、消费、医疗、交通等生活的方方面面,成为一种很有前途的高新技术产品。以校园食堂收费管理系统中的射频卡读写系统为模型,就射频卡的设计原理和应用进行分析。说明并定义了如何建立和调试一个天线单元。另一方面介绍射频卡卡内电源产生电路,解决了非接触式卡内没有电源系统,需要由读卡器通过无线方式供电的问题。 相似文献
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试验车辆运行控制平台具有门禁、道路识别、安全管理、使用统计等功能。RFID技术(射频识别)是一种利用无线射频方式在阅读器和射频卡之间进行非接触双向数据传输,以达到目标识别和数据交换目的的技术。系统以RFID技术为基础,以无线传输为途径,对试验车辆运行进行实时控制。本文概述了控制系统的基本架构,以及数据传输机制。 相似文献
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《黑龙江科技信息》2016,(19)
针对农机制造企业仓储管理过程中流程繁琐、信息统计易出错、物资信息更新滞后等问题,为促进当前农机制造企业仓储管理的信息化水平,以提高仓储管理效率,本文将嵌入式技术、射频识别(RFID)技术以及ZigBee无线通讯技术相结合,设计了一套农机制造仓储管理系统;经过实际测试,该系统能简化物资管理操作流程,减少仓储信息统计错误,并能实时反馈仓储信息,满足农机制造业仓储信息化管理需求,在RFID阅读器中嵌入ZigBee模块构建一种基于ZigBee技术RFID网络系统,扩展了RFID的读写范围且增加了RFID的读写半径,提高了农机制造业的信息化水平,为实现物联网在农业领域的应用提供了技术支持。 相似文献
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开发了一种基于RFID技术的健康证管理系统。该系统采用PHILIPS公司的Mifare读写卡作为射频识别解决方案,以89c52单片机作为读写控制芯片,使用手持式POS机作为移动读取设备。在健康证管理过程中实现了安全、高效、移动、非接触的健康信息确认。 相似文献
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为了解决自行车被盗的现象,应用RFID电子射频技术,结合门禁控制系统,开发了一种自行车防盗系统.筒述了RFID的工作原理,并且详细地介绍了系统的软硬件设计及其实现的各种功能.该系统能快速地读取自行车的车辆信息,并且在读卡器上面设置加密操作,通过控制计算机管理门禁控制器的正常工作,从而达到了给自行车安装"电子身份证",有效地解决了小区、学校和停车场自行车被盗的问题. 相似文献
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针对航空物流的应用需求,提出了基于RFID读卡器和数据库的数据采集处理系统。利用ActiveX通信控件,可以解决RFID读卡器与PowerBuilder之间的通信问题,成功实现串口通信,同时给出PB串口通信程序的主要代码。经多次实验表明,该系统通信可靠、稳定,满足设计的功能要求,同时拓展了PowerBuilder的应用范围。 相似文献
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本文结合某市卷烟配送的实际情况,以RFID技术应用为基础,提出了一套针对性强、可实施性强的实验设计方案,用以验证RFID技术在烟草物流配送环节应用的可行性。此方案设计了一套完整的实验方法,搭建了一个包含软、硬件两部分内容的实验平台,其中软件系统具备数据采集、记录、显示等功能,硬件系统由光电检测、RFID读写设备组成。通过改变实验条件,测试在操作速度、RFID标签个数改变的条件下RFID技术是否能够满足需求。并通过对实验结果进行分析得出结论。 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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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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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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《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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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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《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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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
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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
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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
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《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献