基于3G网络的无线视频监控终端设计

随着网络通信技术的发展,3G技术的高宽带和高可移动性,使视频监控从传统的有线传输进入到无线数字监控阶段。本文设计了一种基于3G网络的无线视频监控系统。经验证,该系统具有传输稳定,延时小,成本低和监控画面流畅等特点。     

基于VPN技术的远程视频监控的实现

随着视频监控应用的普及,视频监控已由监控公共场合逐渐发展到应用于办公室、教学场所甚至家庭室内等。传统的视频监控网络传输模式主要有B／S模式和C／S模式,这两种模式在实际应用于远程视频监控时都存在一定的问题。本文通过对VPN技术介绍,强调利用VPN技术可以解决网络受限问题,通过在公共传输网络上架起安全的传输通道,实现远程视频监控可利用各种终端随时随地地进行访问。     

3G无线视频监控系统的设计与实现

随着3G技术的日益成熟和嵌入式技术的飞速发展,数字化视频监控系统将逐步替代传统的模拟视频监控系统,同时随着人们生活质量的提高和活动范围的不断扩大对无线视频监控系统的需求越来越迫切,所以利用3G网络进行实时视频传输必将成为一种趋势。该系统在Linux操作系统下,搭建了一个基于ARM9的视频图像采集环境,并通过CDMA2000网络完成了视频图像的传输接收,实现了远程视频监控的功能。     

浅谈无线3G视频监控系统维护

无线3G视频监控系统线3G视频监控系统即采用3g网络传输视频信号,通过3G网络将视频信号传输至无线视频服务器,用户通过客户端软件从因特网调取视频图像。它具有灵活性、安装方便、适宜可移动监控等特点。     

天津开发区构建大范围无线网状网

目前，天津开发区正在部署大范围的无线网状网宽带移动网络，以实现全区范围内的视频监控系统。该视频监控系统共有多达200个监控点，分布在30km^2范围内，是国内较大的无线网状网之一。由于这一视频监控系统需要及时传输高带宽的图像和视频，因此，相比2.5G和其他接入技术，无线网状网技术无论在系统带宽，还是工程总造价方面，更胜一筹。     

基于EPON技术的高清网络视频监控系统的探讨

近年来,高清网络视频监控已经成为视频监控行业的发展趋势。然而基于以太网的传统网络传输技术不能满足高带宽、高清晰度、高可靠性的高清网络视频监控的传输要求。文章通过探讨EPON技术在高清网络视频监控中的应用,介绍了EPON技术在高清网络视频监控系统中的优势。     

4G无线VPN在加强民航空管业务传输保障的评估和应用

文章对4G无线VPN技术和原理进行介绍,对电信4G无线VPN专网传输性能进行测试分析,结合民航中南地区空管通信网络和空管业务的分布情况,对电信4G无线VPN专网在加强空管业务传输保障的可行性进行评估,并提供应用建议。     

基于VPN的全数字化远程视频监控系统的架构与实现

本文通过为企业解决对分散地点进行全数字化远程视频监控的难题,经过对一套基于VPN的全数字化远程视频监控系统的开发和架构,对于基于VPN的全数字化远程视频监控系统深入浅出的从系统的网络设计需求,系统组成和原理,系统架构等各个方面进行介绍以阐述这种实用的架构在具体工程实践中的应用情况,论证了VPN在全数字化远程视频监控及相关领域的良好应用前景。     

基于P2P视频监控技术的应急指挥系统研究

文章首先简要介绍了3G视频监控系统与P2P技术,然后着重从网络地址转移、传输模式和客户端功能设计这三个方面阐述基于P2P网络视频监控系统解决方案,最后指出P2P视频监控技术在应急通信指挥中的应用.     

基于S3C6410的视频监控系统的设计与实现

为了实现一种简单,可靠性高的嵌入式视频监控系统,基于三星S3C6410微处理器系统,结合嵌入式技术和图像处理技术,利用S3C6410的硬件编码模块MFC进行MPEG-4编码,采用实时传输协议通过网络进行视频传输。经局域网条件下测试,该系统采集传输视频质量较好,性能稳定,满足低成本、高可靠性的嵌入式视频监控要求。在描述系统框架的同时,更具体地说明了实现部分的关键代码示例。     

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.     

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.     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.