共查询到17条相似文献,搜索用时 78 毫秒
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M2M通信被看作是一种不需要人际互动的机器之间的通信形式,通过通信网络传递信息从而实现机器与机器或人与机器的数据交换。M2M作为物联网在现阶段发展的主要存在形式,其功能架构和安全问题值得重视,文中主要围绕M2M功能架构与安全问题展开研究。针对此问题,欧洲电信标准化协会详细说明了M2M系统相关的安全需求,对机密性、完整性、身份认证以及授权批准进行了研究。此外ETSI还对M2M系统的功能架构进行了设计,提出了概要层的架构方案。最后对该功能架构中各部分涉及安全的模块作了进一步分析。 相似文献
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李琳 《计算技术与自动化》2021,40(4):120-124
M2M通信(Machine to Machine Communication)目前已在物联网范畴内获得巨大的应用,基于灵活易用和良好的移动性,M2M主要采用无线系统架构来实现,例如ZigBee、WiFi和蜂窝网络等.本文采用ZigBee技术,在Android平台采用Java语言设计实现了一种新的M2M应用:近距离即时通讯,该应用可在车联网或其它小区域内数据共享等低速率传输领域获得较好的推广. 相似文献
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M2M通信是近年来随着物联网的兴起和发展而得到长足发展的下一代无线通信技术。该技术的发展和普及为智能电网功能的扩展和实现奠定了基础。文章介绍了M2M技术的发展历史和技术特色,探索了M2M通信在智能电网,特别是家庭区域网络的应用前景,同时指出了M2M通信技术目前所面临的问题和挑战。 相似文献
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彭红姣 《数字社区&智能家居》2014,(11):7495-7496
物联网技术及其应用方面的研究和部署,使得物联网的概念和价值正在不断被实体化,M2M技术,被认为已成为物联网在现阶段主要的表现形式。该文以ETSI M2M技术委员会制定的M2M相关标准为基础,探讨了M2M与物联网的关系,仔细研究和分析了M2M业务能力和功能架构,最后展望了M2M的应用前景。 相似文献
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本文主要论述了无线传感器网络与M2M平台对接的关键性技术——M2M网关的设计与实现。无线传感器网络(WSN)具有独立自组网和超低功耗等优点,但是由于其短距离通信的特征,使其应用范围有所限制。将WSN与M2M平台进行对接,是无线传感器网络发展的必然趋势;而M2M网关则是实现对接的关键性技术。无线传感器网络M2M网关,采用嵌入式ARM9处理器S3C2440为核心;以CC2530作为汇聚节点采集WSN数据;利用GPRS模块EM310为网络数据的出口,对接M2M平台服务器。该M2M网关可将WSN与M2M平台相连接,具有很好的通用性,可广泛使用在众多物联网的实际应用中。 相似文献
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MICHAEL FISHER 《Journal of Symbolic Computation》1996,22(5-6)
Concurrent
is a programming language based on the notion of concurrent, communicating objects, where each object directly executes a specification given in temporal logic, and communicates with other objects using asynchronous broadcast message-passing. Thus, Concurrent
represents a combination of the direct execution of temporal specifications, together with a novel model of concurrent computation. In contrast to the notions of predicates as processes and stream parallelism seen in concurrent logic languages, Concurrent
represents a more coarse-grained approach, where an object consists of a set of logical rules and communication is achieved by the evaluation of certain types of predicate. Representing concurrent systems as groups of such objects provides a powerful tool for modelling complex reactive systems. In order to reason about the behaviour of Concurrent
systems, we requir a suitable semantics. Being based upon executable temporal logic, objects in isolation have an intuitive semantics. However, the addition of both operational constraints upon the object's execution and global constraints provided by the asynchronous model of concurrency and communication, complicates the overall semantics of networks of objects. It is this, more complex, semantics that we address here, where temporal semantics for varieties of Concurrent
are provided. 相似文献
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《CAD/CAM与制造业信息化》2000,(5)
MP8725多媒体投影机 显示:0.9英寸多晶硅TFT(X3) 分辨率: 1024 X 768(XGA) 重量:4.4公斤 亮度:700 ANSI流明(典型) 对比度: 200∶1峰值(100∶1 ANSI) 宽高比:4∶3 镜头焦距:1∶1.3手动 屏幕尺寸: 23英寸(最小)to 300英寸(最大) 水平扫描:25-80KHz 垂直扫描: 56-120 Hz 输入端口: S-Video:(1) Mini DIN 4-pin Video:(1) RCA jack Audio:(1) RCA stereo jack RGB:… 相似文献
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M. A. Schneps-Schneppe 《Automatic Control and Computer Sciences》2012,46(2):83-89
M2M communications promise unprecedented prospects for communication specialists: the world communication network currently
covers less than 0.1% of the total amount of equipment (estimated at 50 billion). Having considered the problem of energy
saving, the European Commission in 2009 issued a mandate for the European Telecommunications Standards Institute (ESTI) to
create a common open architecture for metering the domestic use of water, gas, electricity, and heat. We consider the choice
of the M-Bus protocol as a unified tool for implementing the interfaces of M2M devices. A new approach to open programming
interfaces is proposed. 相似文献
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《Annals of the History of Computing, IEEE》1983,5(1):64-72
Tape 6 in Christopher Evans's "Pioneers of Computing" series is a 1975 interview with John M. M. Pinkerton, edited excerpts of which are printed here. A focal point of the interview is Pinkerton's role in the design and construction of LEO I at J. Lyons & Co. in Great Britain. LEO (Lyons Electronic Office) was inspired by and based on Maurice V. Wilkes's pioneering EDSAC and was one of the first electronic computers designed specifically for commercial rather than scientific use. LEO heralded today's revolution in office work-a revolution whose ultimate impact is still in our future. 相似文献
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Merabet Fatma Cherif Amina Belkadi Malika Blazy Olivier Conchon Emmanuel Sauveron Damien 《Peer-to-Peer Networking and Applications》2020,13(2):439-474
Peer-to-Peer Networking and Applications - With the rapid advancement of heterogeneous wireless technologies and their proliferation in ambient connected objects, the Internet of Things (IoT) is a... 相似文献