基于ZigBee技术的无线温湿度传感器网络设计

介绍了一种基于ZigBee技术的无线温湿度传感器网络的设计,以CC2430单片机和数字式温湿度传感器SHT10设计出了温湿度传感器网络节点,以AT91R4008微控制器、AX88796以太网控制器芯片和CC2430无线单片机设计出了ZigBee网关。温湿度传感器节点通过射频收发器将数据发送到ZigBee网关。ZigBee网关通过以太网网络将数据传输给监测中心主机。文章讨论和提出了无线传感器节点的低功耗设计和数据通信的可靠性方法。该系统稳定性好,通信效率高,可广泛应用于工业环境温湿度监测。     

基于CC2530无线传感网络系统的设计

提出一种基于ZigBee协议的用于测量温度的无线传感器网络方案,方案中使用CC2530无线芯片和温度传感器DS 18B20搭建了一个基于ZigBee协议栈的无线传感器网络.该网络由一个协调器充当中心节点和若干个终端节点一起,构成一个星型网络,给出了传感器节点、协调器节点的硬件设计原理图及软件流程图.实验证明节点性能良好、通信可靠,通信距离明显增大.     

基于ZigBee的高压开关柜无线温湿度监测系统

针对高压开关柜温湿度监测的迫切性及其内部不允许布置额外的电缆线等特点,提出基于ZigBee技术的无线温湿度监测方案.系统的实现基于TI公司的ZigBee解决方案CC2430&Z-Stack和温湿度传感器SHT71,详细讨论硬件设计、软件设计和ZigBee网络终端节点的低功耗问题.系统可以完成对高压开关柜的温湿度监测,有效地防止事故的发生,可靠性高、安装方便、终端感测节点功耗低,取得了良好的现场试用结果,是高压开关柜温湿度监测的理想解决方案.     

基于MSP430和CC2520无线温湿度监测系统设计

无线传感器网络由于其蕴藏着巨大的应用价值,已成为国际上理论研究的热点之一。本文基于ZigBee协议组成无线传感器网络,采用超低功耗微控制器和无线射频收发器构成监测节点,利用免费协议栈Z-Stack构建的无线温湿度监测系统,可准确实时地采集环境温湿度数据,具有低功耗、低成本的特点。     

基于ZigBee技术的大棚温湿度无线监控系统研究

研究和开发了基于ZigBee技术的大棚温湿度无线监控系统.采用ZigBee技术将各种传感器、执行机构以及无线收发模块自组网形成无线传感网络,监控节点遍及大棚内各个监控位置,实现智能监控和数据管理.监控系统以PID控制算法为核心,对大棚内温湿度进行实时控制.实验表明,大棚温湿度无线监控系统能够有效监控大棚内温湿度变化,并且能够克服扰动,降低管理成本,提高大棚种植的科学管理水平、生产效率和植物产量及质量.     

基于ZigBee的温湿度监测系统

文章介绍了一种基于ZigBee的温湿度监测系统,系统以无线射频芯片CC2530为核心设计了用于温湿度监测的无线传感器网络,对系统的硬件电路设计和温湿度传感器DHT11的选择作了说明,给出了协调器和终端设备的软件结构图,设计了上位机监测平台软件。经测试表明系统运行稳定、节点硬件接收灵敏度高、温湿度测量准确,且具有可视化特点,可广泛用于环境监测。     

基于CC2430的无线传感器网络的实现

无线传感器网络是一项新兴的技术,具有广泛的应用领域。在简单介绍无线传感器网络的概念及其特点的基础上,着重讨论基于ZigBee技术和433 MHz无线射频技术的无线传感器网络的实现方法,包括无线传感器网络的硬件和软件设计。ZigBee是一种具有全球统一标准的自组织网状网,网络容量大、组网灵活。多个ZigBee网络的协调器节点通过433 MHz无线射频组成星型网,有效地扩大了传感器网络的地理覆盖范围。实验结果表明,网络节点及整体网络均获得了良好的性能,验证ZigBee是实现无线传感器网络的理想解决方案。     

基于ZigBee的无线传感器网络节点的设计与通信实现

介绍了基于IEEE 802.15.4的无线通信协议ZigBee协议结构及其技术特点,从低功耗、低成本节点设计的角度提出了无线传感器网络(WSN)通用节点的基本构架,设计了一种具有实用价值的通用节点软硬件平台,节点通信采用短距离无线技术规范ZigBee,通过SPI接口实现单片机和ZigBee芯片的通讯,单片机与计算机通过USB连接。给出了系统的硬件结构及软件设计的方案,并从硬件和软件两方面考虑了节点的功耗问题。     

建筑物抗震性无线检测系统的设计

介绍了一种基于无线传感器网络技术的建筑物抗震性检测系统.首先,提出了以无线通信震动传感器形成一种可扩展的无线传感器网络的系统结构.然后,介绍在该系统中采用的无线震动传感器节点以及检测基站设备的设计.在本系统中,节点和基站设备所使用的近距离通信标准为802.15.4/ZigBee标准.     

基于ZigBee技术的家庭WSN及远程控制研究

提出了一种利用GSM网络远程控制并基于ZigBee技术的家庭无线传感器网络(WSN)的方案。注册的GSM模块与ZigBee技术的家庭WSN的网络协调器进行通信,家庭WSN节点之间采用无线通信方式,ZigBee的无线传感器嵌入在家用电器中,最终目的是通过GSM网络远程控制家用电器,具有重要的现实意义和较高的实用价值。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks