基于GPRS的开关磁阻电机控制器远程控制系统的设计与实现

GPRS通用无线分组业务是一种基于GSM系统的无线分组交换技术,提供端到端、广域的无线IP连接,具有传输速率快、运营费用低、可靠性高、开发方便等明显的优点。本文介绍了一种基于GPRS的开关磁阻电机远程控制调速系统以及进行数据采集的系统,包括其系统硬件及软件设计。     

GPRS网络——手机上网新选择

<正> GPRS(General Packet Radio Service),通用无线分组业务,是移动通信技术和Internet技术共同发展的结晶。它可以提供高速的、高于固定Internet速率的无线数据接入。是一种基于GSM系统的无线分组交换技术,提供端到端的、广域的无线IP连接。通俗地讲,GPRS是一项高速数据处理的科技,方法是以“分组”的形式传送资料到用户手机上。GPRS是GSM向3G系     

用IP路由方式配置爱立信GPRS系统Gi接口

１GPRS概述英国BTCellnet公司于1993年提出了通用分组无线业务（GPRS，generalpacketradioservice），它是实现GSMPhase2+（1997年）规范的内容之一。作为2G向3G过渡的技术，GPRS是一种基于GSM的移动分组数据业务，它在移动用户与数据网络之间提供一种连接，给移动用户提供高速无线IP和X.25服务。GPRS是在GSM网络基础上叠加一个网络，它在现有GSM网络中增加一些硬件设备，并对软件升级，形成一个新的网络逻辑实体，为用户提供端到端广域无线IP连接，GPRS网络结构如图1所示。通俗地讲，GPRS是一项高速数据处理技术，它以…     

TCP/IP在GPRS/EGPRS网络中的应用及影响

通用分组无线业务/增强型数据速率演进技术（GPRS/EGPRS）服务扩展了当前世界上最流行的第二代移动系统——基于语音的GSM,使其能够收发基于分组的数据。随着移动通信技术的发展和业务的多样化,人们对数据业务的需求不断增加,GPRS/EGPRS网络优化也成为了重中之重。除传统的无线网络及核心网络优化外,将其以端到端的思路分析,看为无线＋IP网络技术,成为了新的优化思路。因此传输控制协议/因特网互联协议（TCP/IP）作为互联网固有的最为广泛的传输协议在无线分组数据业务网络中同样得到广泛应用。主要就TCP/IP协议在GPRS/EGPRS中的应用其影响进行了分析。     

基于模块的车载监控终端设计

GPRS（GeneralPacketRadioService）是一种基于GSM系统的通用分组无线业务,提供端到端的、广域的无线IP连接。其方法是以“分组”的形式传输数据,网络容量只在所需时分配,不需要时就释放。这种数据传输技术速度快,通信质量高,无须经过公用电话交换网的转接。车载GPS终端正是利用GPRS通信网络,实现定位数据信息到监控客户湍的可靠传输。     

玩转GPRS上网无线分组业务入门问题解答

GPRS是通用分组无线业务（General Packet Radio Service）的英文简称，是一种基于GSM系统的无线分组交换技术，提供端到端的、广域的无线IP连接。通俗的讲，GPRS是一项高速数据处理的科技，方法是以“分组”的形式传送资料到用户手上。虽然GPRS是作为现有GSM网络向第三代移动通信演变的过渡技术，但是它在许多方面都具有显著的优势。由于GSM数据传输在空中接口的网络速率低（9．6kb／s）     

基于模块的车载监控终端设计

GPRS（GeneralPacketRadioService）是一种基于GSM系统的通用分组无线业务,提供端到端的、广域的无线IP连接。其方法是以“分组”的形式传输数据,网络容量只在所需时分配,不需要时就释放。这种数据传输技术速度快,通信质量高,无须经过公用电话交换网的转接。车载GPS终端正是利用GPRS通信网络,实现定位数据信息到监控客户湍的可靠传输。     

PDCH信道配置规划分祈

GPRS即通用分组无线业务,是在GSM技术的基础上提供的一种端到端分组交换业务.它最大限度重用已有的GSM网络基础设施,提高了GSM无线资源利用率. PDCH即分组数据信道,是无线数据业务在空口的载体,是业务拓展的前提,PDCH信道的配置及优化同GPRS优化息息相关。     

PDCH信道配置规划分析

GPRS即通用分组无线业务,是在GSM技术的基础上提供的一种端到端分组交换业务。它最大限度重用已有的GSM网络基础设施．提高了GSM无线资源利用率。     

通用分组无线业务（GPRS）技术（节录）

通用分组无线业务 ( GPRS,General Packet Ra-dio Service)是迈向第三代个人移动通信的里程碑 ,它使移动通信与数据网络合二为一 ,使 IP业务进入广阔的移动市场。　　 1 . GPRS的功能和业务　　 GPRS是在移动用户和远端的数据网络 (如支持 TCP/IP、X.2 5等网络 )之间提供一种连接 ,给移动用户提供高速无线 IP和无线 X.2 5业务。GPRS采用分组交换技术 ,它可以让多个用户共享某些固定的信道资源。如果把空中接口上的TDMA帧中的 8个时隙都用来传送数据 ,那么数据速率最高可达 1 64kbit/s。根据欧洲 ETSI的 GSM第 2 阶段的建…     

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.