以太网与无线WIFI传输的机车车辆检测系统

为了解决传统车辆检测装置安装布线复杂,传输速率慢的缺点,设计了一种无线网络化的车辆检测系统。该系统以STM32为核心建立主控制器,MSP430单片机为核心建立无线传感器网络节点,通过传感器完成多种车辆振动信号的采集。采用无线WIFI与以太网两种通信方式实现控制指令与采集数据的高速传输,同时设计了基于C#.NET平台设计的人机交互界面,实现对车辆运行状态的实时监测。通过实验验证,系统能够完成车辆运行过程中速度,加速度等振动信号的高速采集、传输与处理。     

基于RFID和ZigBee的城市智能公交系统设计

本文设计的基于RFID和Zig Bee的智能公交系统,通过智能车上RFID射频识别检测站台信息,运用无线传感网络车载路由器节点将车辆检测数据传送至控制中心协调器,由控制中心节点将车辆运行状态发送至各站台路由器,控制公交站台LCD显示。在车辆运行中,利用labview编写的上位机,对车辆运行数据实时监测,以便做好公交车调度安排。     

基于无线传感网络的高速铁路监测系统

为提高高速铁路轨道监测系统的实时性和可维护性,采用基于Thread的无线传感网络实现轨道状态的实时采集、汇聚和远程传输。采用时间同步休眠控制策略和基于阈值的数据采集策略以提高监测系统的可靠性。通过系统仿真、网络的性能测试,该系统能对高速铁路轨道状态进行实时有效监测,对轨道安全和铁路运输有现实意义。     

一种基于无线传感器的血液净化监测网络设计

提出了一种基于短距离无线通信技术的传感器网络监测设计方案,设计中采用了MSP430系列微处理器进行信号调节和数值处理,通过集成电源模块、输入模块、无线传输模块和LCD显示模块形成患者生命体征监护传感器的终端节点;在阐述血液净化原理的基础上进行系统的硬件和软件设计,系统分析了各传感器节点与血液净化中心节点之间的实时网络数据传输,解决了血液净化中运行状态的过程控制、患者实时体征监测和实时参数调节等系列问题,最后通过实验仿真测试达到了个性化治疗和安全监控的目的。     

卫星通信网络信号智能监测系统

提出一种对卫星通信网络信号进行自动监测系统及其实现方法。在不影响网络运行和信号传输的前提下，该系统通过对卫星通信网络系统内下行载波中各种技术参数的采样记录、统计分析，及时发现系统存在的故障，实现对网络的智能化实时连续轮巡。同时可通过系统软件设置测试模式，进行自动测试，并对存储的数据进行分析、比较，得到反映系统当前性能和运行状态的参数的实际数值。系统即时性强、参数误差小、效率高。     

基于嵌入式的汽车状态远程实时监测系统

研究一种基于嵌入式的汽车状态远程实时监测系统,主要对车载嵌入式监测系统、无线数据传输系统两大系统进行了深入研究,选定车载嵌入式系统使用CAN总线进行通信,无线数据传输系统以GPRS通信为主,蓝牙通信为辅。使用TI公司的OMAP-L137处理器实现数据汇总、发送以及人机交互等功能。由多个MSP430F169处理器对车辆各大系统进行监测,并通过CAN总线方式传输至OMAP-L137处理器。以国产哈弗H5为例,对嵌入式远程实时监测系统进行性能测试,同时使用汽车官方测试仪器进行测试对比。结果表明,该文研究的嵌入式车辆状态远程监测系统的检测结果与官方测试数据基本一致,误差不超过5%,可以满足远程监测和故障诊断的基本要求。     

物联网技术在危化品运输中的应用

针对危化品运输的过程控制．状态监测．在途追踪,应急处理等方面存在的问题,本文介绍了采用无线传感器网络（WSNs）技术．构建危化品在途运输监测系统,对危化品本身的状态、车辆状态进行全方位监测,实现了对运输的全程．全方位、实时监测和管理。该系统提高了信息采集、处理分析的准确性和即时性．提升了危化品运输过程的安全性。     

基于QXN的车机蓝牙无线监控系统

摘 要: 车载终端与便携设备的互连技术推动了整个车控系统的飞速发展。随着Telematics技术的不断应用和创新,单靠车辆内部监测和控制系统已很难满足现代用户的苛刻要求。为此,提出基于QNX的车机蓝牙无线监控系统方案,以手机端和车载端的蓝牙SPP协议为基础,设计CAN-USB模块作为车机通讯枢纽,对两端蓝牙无线指令数据进行对等收发和处理;采用CAN总线实时采集和配置车辆ECU的各项性能参数。实验表明：该方案不仅能用手机对车辆运行状态进行实时监测和控制,而且有效提升车辆操控的互联性和智能性。     

无线传感网在煤矿安全系统中的应用研究

针对矿井中安全监控设备使用有线方式传榆信号存在的弊端,分析了在井下环境中采用ZigBee无线网络技术的可行性,介绍一种以CC2530无线单片机为ZigBee网络核心单元的矿井瓦斯浓度监测系统,详述其设计原理和实现方法,并给出网络节点的软硬件设计方案.该系统实时监测矿井各处瓦斯浓度,实时收集并传输数据.测试结果表明,该系统实时性高,功耗低,实现了在无线环境下对矿井中瓦斯浓度的有效监测.     

基于ZigBee和GPRS的支架结构安全监测系统设计

作为路桥施工中常见的一种结构,路桥支架结构存在施工监理和在役监测难,以及检测手段有限等问题。在此提出了一种基于Zigbee和GPRS无线通信技术的支架结构安全监测系统。该系统由ZigBee技术组成无线传感器网络对支架结构立杆及剪刀撑部位进行应变和倾角的数据采集,智能无线传感器将所采集数据直接或通过路由设备无线发送至协调器。GPRS网络再将ZigBee协调器汇聚数据进行无线远传至远程监控中心监测软件。上位机监测软件采用LabVIEW编写,实时显示监测现场数据,并能够实现对数据的存储、查询及报警。实验测试结果表明该系统能够实现对支架结构的在线、快速、准确测量,从而满足对支架结构进行长期实时监测的要求。     

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.