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This paper describes the structure of the seven sections of digital tube that principle, the principle of dynamic scanning, decoding principle, and on this basis, using hardware description language VHDL programming cathode seven sections of digital tube a total of four digital display of the cycle 1 - F, and Quartus Ⅱ platform in the realization of the modules on the timing and top-level simulation of timing simulation module, downloaded to the final realization of the development board of the digital characters and the show rolling.

本文还介绍了七段数码管的结构，显示原理，动态扫描原理，译码原理，以及在此基础上用硬件描述语言VHDL编程实现4位共阴极七段数码管循环显示1-F，并在QuartusⅡ平台上实现了各个模块的时序仿真和顶层模块的时序仿真，最后下载到开发板上实现了数字和字符的滚动显示。

The basic technology of PKI include encipher digital signature data integrity mechanism digital envelope double digital signature, digital certificate etc.

PKI的基础技术包括加密、数字签名、数据完整性机制、数字信封、双重数字签名，数字证书等。

In order to improve the reliability of the nuclear Generating Sets and the stabilization of the power system, prevent the long time low frequency oscillation caused by the disturbed of the outside electrical net, assured improving the stabilization margin of the nuclear generating sets in the precondition of enough transient stability, validate the sensitivity of the parameter to the damping of Generating Sets of the MEC5220 digital excitation adjustor produce in Japan that used in the Second Project of Qinshan Nuclear Power Plant, confirm the parameter rationality of the digital excitation adjustor, optimize the parameter of PSS, in this paper, we put up a in-depth study to the principle of MEC5220 digital adjustor produce in Japan by the PSS/E software that develop by the PTI Company in the USA, completed the modeling of the excitation adjustor, PSS, generator, excitor, described the performance of this excitation adjustor, analyzed the essential reason that caused the low frequency oscillation, illuminated the factor that influence the damping characteristic of the MEC5220 digital excitation adjustor. Based on model and emulate, this paper optimized the primary parameter of the excitation adjustor, make a reasonable regulation to the PSS parameter.

为提高核电机组的运行可靠性和接入系统的安全稳定性，防止在外电网的干扰下核电机组发生长时间的低频振荡，保证机组在暂态稳定的前提下提高其稳定裕度，验证秦山核电二期核电机组所配日产MEC5220型数字式励磁调节器参数对机组阻尼的灵敏性，确定数字式励磁调节器的参数的合理性，优化PSS整定参数，本文利用美国PTI公司研发的PSS／E软件对日产MEC5220型数字调节器的原理进行进行了深入细化的研究，完成了励磁调节器、PSS、发电机、励磁机的建模，描述了该型励磁调节器的性能，分析了产生低频振荡的根本原因，阐明了影响阻尼特性的因素。

On the basis of theoretical analysis of digital holography, the preliminary study carries out through computer simulation and experiments. The main work is as follows:Firstly, on the basis of off-axis Fresnel diffraction, the principles of optical holography and digital holography are introduced. Besides, the theories such as recording digital hologram, numerical reconstruction and the related digital image processing methods are analyzed.

本论文从理论分析、计算机仿真和实验三个方面对数字全息技术进行了初步的研究，主要完成了以下工作：首先，介绍了传统的光学全息术和数字全息技术的基本原理，以离轴菲涅耳全息为例对数字全息的记录条件、数值重现算法、以及相关的数字图像处理方法进行了详尽的理论分析。

Acer digital technologies are now the main product lines: ADSL2 / 2 +, WLAN, VOIP, FWT, will soon market the product has: VDSL2, IPTV STB. In 2001, Acer digital technology on its own development and production of ADSL CPE, through the Ministry of Information Industry of the network detection, the indicators are good; in 2003, the company successfully passed the National Product Quality Compulsory Certification (3C Certification); 2003 December, macro digital technology passed the China Import and Export Commodity Inspection Corporation Quality Certification Center of the ISO9001: 2000 quality system certification assessment, and obtained ISO9001: 2000 Quality Management System Certification. In 2004, Acer digital technology VOIP terminal equipment in the Canton Post ASTRI compatibility testing of the indicators are very good; in August 2004, Acer ADSL terminal equipment into the company through a strict CE certification, obtained in license permits the sale of the European Union.

宏成数字科技目前主要产品线为：ADSL2/2＋、WLAN、VOIP、 FWT，即将投放市场的产品有：VDSL2、IPTV STB.2001年，宏成数字科技自行研制与生产的ADSL用户端设备通过了信息产业部的入网检测，各项指标均优良； 2003年，公司顺利通过了国家产品质量强制性认证（3C认证）；2003年12月，宏成数字科技顺利通过了中国进出口商品检验总公司质量认证中心的ISO9001：2000质量体系认证的评审，并获得了ISO9001：2000质量管理体系认证证书。2004年，宏成数字科技的VOIP终端设备在广州邮科院的兼容性检测中各项指标非常优秀；2004年8月份，宏成公司ADSL终端设备通过了严格的CE认证，获得了在欧盟销售许可的通行证。

After analyzing characteristics of urban spatial data, this paper partly implements the integration of spatial data of multi sources and organization and management of sea-large spatial data. Finally, the spatial data managing system makes a uniform management, maintenance and updating on such data as digital linear graphic, digital elevation map, digital orthoimage, digital raster data, reference points and metadata.

本文针对城市空间数据特征分析，部分实现了多源空间数据的集成和海量空间数据的组织与管理，实现了多库一体化分布式城市空间数据管理系统，将数字矢量线划数据、数字正射影像数据、数字高程模型数据、数字栅格数据、控制点数据以及元数据的进行统一的管理、维护和更新。

This dissertation introduces the whole scheme、the hardware electro circuit design and software design, the result of experiment on salinometer is preferred at the end of the dissertation. Salinometer is base on SOPC technology, and use digital technology to design circuit: the excitation source for balance bridge is generated by digital method, its shape、amplitude and frequency can be control by digital signal, the standard branch of bridge is composed of three digital-analog-conversion, and uses the method of successive approximation to regulate the balance of bridge.

盐度计以SOPC技术为基础，通过数字化方式设计测量电路：电桥的激励源由数字化方式产生，激励源的波形、幅值和频率等可由数字量控制；平衡电桥标准支路由3个数模转换器组合实现，测量时以逐次逼近的方式调整电桥的平衡度；检测电桥平衡度的高灵敏度数字检流计同样以数字化方式设计，它的增益由程序控制，将电桥的输出电压数字化，以软件判断电桥平衡度。

Digital factory overall operating mode, the resumption of the three digital business card printing and membership card making payroll process, the business card printing and membership card making business moved to traditional business card printing and membership card-making factory, and order small digital business card printing and membership card equipment, such as OKI C9800n as the production of digital business card printing and membership card equipment to add.

数码工厂整体经营的模式为，收回三家数码制卡和会员卡制作门店，把数码制卡和会员卡制作的业务搬到传统制卡和会员卡制作工厂中，并采购小型数码制卡和会员卡制作设备（如OKI C9800n）作为生产型数码制卡和会员卡制作设备的补充。

The development of digital technology influences on the music industry radically on the internet time. The Phonogram and Videogram Producers have to transfer into digital modality. New competition elements penetrate, such as Online-music Operator, the Service Provider, and the Terminal Facilities Producer, go into the industry . Even the Mobile Operator would like to lead the development of the music industry by the music digital operation. There are gambling and amalgamation among groups for the increasing future of digital music.

网络时代数字技术的发展对音乐产业产生了颠覆性的影响，传统唱片公司不得不进行数字化转型，产业链加入了新的竞争力量——网络音乐运营商、增值服务提供商、终端设备制造商，甚至移动运营商以其音乐数据业务欲主导音乐产业的发展，各种力量之间的博弈、融合均为了未来数字音乐极具潜力的发展前景。

In order to realize the compatible communications system between digital TETRA and analogy MPT1327. Communications protocol between digital radio and control center is defined. Emergency call software flow for TETRA and MPT module is designed, and also state information sending and receiving for TETRA and MPT module is designed in this communication system. By comparing several solutions, switch methods between analogy TETRA communications and digital TETRA communications are designed including manual-switch and soft-switch. In the article, coding module of receiving and sending equipments in TATT analogy TETRA communications is described, so that it can be compatible with NOKIA network equipments and it also can improve the availability rate of the trunk system. In order to realize the integration of digital TETRA communication and analogy MPT1327 communications, double- frequency antenna system is researched.

通过几种车载电台解决方案比较，设计了相应的模拟集群通信系统与数字集群通信系统的切换方法，其中包括人工切换和软切换，实现了模拟与数字集群兼容的一体化移动列车调度电台解决方案；为了实现数字集群通信系统与模拟集群通信系统以及NOKIA与TAIT模拟集群通信系统之间的相互兼容，设计了新的数字车载电台与控制中心之间的通信协议；系统设计了用于数字集群通信模块的紧急呼叫通讯流程，以及设计了用于模拟集群通信模块状态信息发送与接收流程，以满足列车无线调度的运营要求；论文还论述了对TAIT模拟集群收发设备编码模块的改造，使之能与NOKIA的集群设备相兼容，提高了集群设备的利用率，为在NOKIA模拟集群通讯模块停产后寻找了一种可替代的兼容解决方案；为了实现数字集群通信系统与模拟集群通信系统设备的综合，论文还探讨了本工作所需专用的双频段的天线系统。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。