无线传感器网络中的通信技术

无线传感器网络是由大量传感器节点通过无线通信技术自组织构成的网络,有着巨大的应用前景。针对传统无线通信技术无法适应无线传感器网络低成本、低能量、高容错性等要求,结合新兴无线通信技术ZigBee的特点,阐述了基于ZigBee技术的无线传感器网络的主要优势。     

Regulator flexibility and the administrative allocation licensing of 3G spectrum

Globally, most nations assign radio spectrum to provide 3G mobile services during the period 1999–2007. While there is consensus among most economists that auctions are the preferred assignment mechanism, the assignment mode is split, more or less, equally (in terms of the number of licences issued) between administrative allocations and auctions. With auction procedures tending to raise more revenue for governments (Cartelier, 2003) the question that naturally arises is: why are administrative allocations so popular a method to assign spectrum? McMillan (1995) conjectures that administrative allocations provide additional ‘flexibility’. Accordingly, this study examines the performance of 3G assignments in terms of an econometric analysis of a unique sample of national 3G spectrum administrative allocations. These outcomes are modelled as depending on spectrum package attributes, and post-award network deployment requirements.     

基于耦合加载的低剖面天线设计

设计了一种小型化双频天线。通过在单极子天线上引入寄生耦合的方法,即在单极子 顶部引入耦合加载板,既保证了单极子天线的辐射全向性又减小了电小天线的分布电容 ,从而使该天线具有宽频带、低剖面特性。采用仿真软件Ansoft HFSS进行仿真和优化,优 化结果表明：该天线工作频率为824～960 MHz/1 710～2 690 MHz（驻波比小 于等于2） 。根据仿真模型制作了一款天线,实测驻波带宽可达811～1050MHz/1580～2660 MHz,且在水平面内辐射全向方向图。该天线在限制尺寸的情况下有效地展宽了带宽。     

无线传感器网络技术在录井中初步应用探讨

目前,录井中参数采集传输主要还是以有线为主,包括总线和分线参数采集传输。而无线传感器网络(WSN)技术在录井数据采集系统中的使用将是录井工程的一个必然发展方向和趋势。无线传感器网络技术在录井数据采集系统中的设计、应用和推广,对于录井工程的发展将有着重要的意义:不仅可以节约录井成本,而且能提高录井效率。     

低功耗分簇路由算法LEACH的能耗分析

文章对无线传感器网络低功耗分簇路由协议的代表性算法—LEACH的运行机制以及性能做了详细的研究,针对该算法的分簇阶段、簇的建立阶段以及稳定的数据传输阶段的相关原理和运行情况作了深入分析。最后从正反两方面总结了LEACH协议的运行特性。     

一种基于无线传感器的温室环境监测系统实现方法

本文针对当前温室环境监测系统的不足,将无线传感器网络技术[1]、Zig Bee技术和嵌入式技术相结合,探索出实现低成本、高效率的温室监测系统,为降低温室监测系统的造价,为提高设施农业发展水平提供必要的支持。     

RFID与WSN融合技术的研究

本文探讨了RFID与WSN融合的技术,对其融合方案进行了比较,并分析了RFID与WSN相互融合的状况和发展趋势。     

基于动态规划的无线传感器网络的路由算法

在无线传感器网络的研究中,其中一个重要的问题就是路由问题,在数据传送方面具有多跳的特点,表现这一特点的原理就是动态规划原理,借用此原理来设计传感器网络的路由算法显得最适合不过了。文章经过分析研究和测算,认为路由算法能最大限度的实现能量节省。     

无线数据传输及监测技术的应用

本文阐述了无线数据传输及监测技术在温度远程监测系统中的应用。文中详细介绍了在温度远程监测系统中如何运用无线温度传感技术,无线通信技术、以及GSM短信报警轻松实现无人值守和远程监测。     

Integration of hybrid wireless networks in cloud services oriented enterprise information systems

This article presents a hybrid wireless network integration scheme in cloud services-based enterprise information systems (EISs). With the emerging hybrid wireless networks and cloud computing technologies, it is necessary to develop a scheme that can seamlessly integrate these new technologies into existing EISs. By combining the hybrid wireless networks and computing in EIS, a new framework is proposed, which includes frontend layer, middle layer and backend layers connected to IP EISs. Based on a collaborative architecture, cloud services management framework and process diagram are presented. As a key feature, the proposed approach integrates access control functionalities within the hybrid framework that provide users with filtered views on available cloud services based on cloud service access requirements and user security credentials. In future work, we will implement the proposed framework over SwanMesh platform by integrating the UPnP standard into an enterprise information system.