基于ARM处理器的Zigbee网关设计

针对Zigbee网关无法连入以太网的问题.提出一种基于ARM平台的无线传感网络嵌入式网关的设计方案.硬件以ARM9芯片S3C2410和CC2430无线模块为核心进行设计,实现了Zigbee网络与以太网络的互联,从而可将检测、控制设备连入互联网,实现更广阔的网络控制平台.     

基于ENC28J60的嵌入式以太网／CAN网关设计

提出一种基于ARM7芯片LPC2294微处理器和以太网控制器ENC28J60的以太网/CAN网关设计方案,阐述以太网/CAN协议转换的硬件设计,以及相关接口通信软件设计.通过该网关可以实现CAN总线与基于IP/TCP协议的以太网之间的双向通信.     

煤矿井下异构无线 Mes h感知网络融合研究

在综合分析各感知网络和以太网网络特点及其异构性的基础上,提出了分层的异构网络融合网关结构模型,设计了网间通信统一的数据包格式和全网统一的地址编码方式．具有多切换接口的M esh终端,能够根据自动切换管理技术智能地接入不同网络．网关实现了基于802．11、802．15和802．3等协议的语音业务、视频图像业务以及数据传输业务在不同网络间的无障碍通信,网关的双向通信功能,使其连通的两端网络以对等方式通信,最终实现了井下全网互联互通．     

基于ARM平台的智能家居网关设计

介绍智能家居网络各种传输介质的优缺点,设计一种基于电力线传输的简化分时发送协议。在此协议基础上,提出一种基于ARM平台的智能家居网关设计方案。根据系统设计的要求,进行无线Wi Fi、电力传输、以太网等模块的电路设计和相应的网关软件流程设计。最后,通过系统调试证明该系统电路简单、设计合理且实用性强。     

面向停车场管理系统多协议网关研究﹡

针对停车场管理系统,设计了两种通信技术之间直连网关。采用 Zigbee 与计算机融合的通信技术,满足了车辆管理、医院监护和智能家居等远程监控领域的个性化需求。对网关的串口通信模块和网络通信模块进行了分析,并详细介绍了在 Linux 操作系统环境下的串口编程和基于 TCP/IP 协议的 Socket网络编程及通过 ARM 控制的 GSM 短信模块,实现了远距离实时报警。本网关通过 Select 监控机制实现了串口数据流和以太网的数据流的同步转换。     

面向智能家居的嵌入式传感网网关的研究与设计

为了实现家庭内部网路与Internet以及GSM网的互联,提出了一种嵌入式无线智能家居网关系统的设计方案。该网关系统的硬件平台以ARM920T核处理器S3C2440为主处理器,采用ZigBee协议建家庭内部网络,而且通过以太网模块和GSM模块接入外部网络。软件平台采用Linux操作系统,通过交叉编译设计网关的应用程序。最后,以Qtopia Core为嵌入式GUI,进行家庭网关监测应用软件的功能需求分析,设计图形用户界面,实现家庭内部信息的查询。基于ARM9和Linux的嵌入式网关系统,可扩展性强,数据处理速度快,使用简单,能够对家庭网络内部多项环境信息进行监测。     

IP地址、子网掩码和网关地址

TCP/IP（Transmite Control Protocol传输控制协议/Internet Protocol网际协议）已成为计算机网络的一套工业标准协议。Internet网之所以能将广阔范围内各种各样网络系统的计算机互联起来,主要是因为应用了“统一天下”的TCP/IP协议。在应用TCP/IP协议的网络环境中,为了唯一地确定一台主机的位置,必须为TCP/IP协议指定三个参数,即IP地址、子网掩码和网关地址。IP地址实际上是采用IP网间网层通过上层软件完成“统一”网络物理地址的方法,这种方法使用统一的地址格式,在统一管理下分配给主机。Internet网上不同的主机有不…     

一种基于ARM的嵌入式网关系统设计与实现

针对以太网与CAN现场总线之间互连的需求,提出一种基于ARM的嵌入式网关系统设计与实现,分别从网关硬件系统组成、协议转换流程以及嵌入式Linux下CAN设备驱动程序的开发方法进行分析与设计.通过软、硬件平台的搭建与测试,实现了以太网与CAN现场总线之间的协议转换,为CAN/Ethernet的互连提供了一种传输速度快、成本低、稳定性高的网关解决方案.     

基于Zigbee和以太网的家居信息采集设计

为了实现对家居信息系统的采集,文章提出了一种基于Zigbee和以太网技术的设计方案,在探讨了Zigbee技术和uIP协议栈的特性后,采取硬件电路模块化的设计方法,实现了Zigbee无线采集技术,通过uIP协议栈的移植,完成了对家居信息系统的采集。现场应用结果达到预期目标,文章的设计方案在智能家居等领域中具有一定的实际应用价值。     

GPS网络与无线传感网络的融合应用

为了解决传统远程监控系统存在的问题,提出一种基于多网融合技术的远程传感监控及控制系统,在满足通信系统的各项要求指标的基础上,采用逐级控制、整体管理,实现对远程传感数据的统一监控和管理。系统由传感器节点、Zigbee网络、网关、多种通信网络(3G、GSM、GPS等)、电源系统、服务器和客户端组成。系统首先从传感器采集数据开始,通过Zigbee网络传输,由Zigbee协调器传输至网关,经过网关的ARM11处理器S3C6410协议转换以及数据预处理之后再传输至3G网络,再通过3G网络传输到服务器。本文将重点进行GPS网络与无线传感器网络的融合设计。     

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.     

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.     

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.     

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