通过这一款选修课小系统，学生可以登入学生端进行选课及其他的操作，管理者通过登入管理端可以进行对选修课系统的数据的管理和维护。在学生端主要设置了3个基本功能：学生...

EUROPEAN STANDARD EN 50221 Common Interface Specification for Conditional Access and other Digital Video Broadcasting Decoder Applications-EUROPEAN STANDARD EN 50221 Common Interfa ce Specification for Conditional Access and ot her Digital Video Broadcasting Decoder Applic ations

本文介绍了一种控制普通阀门的阀门控制器的设计方案，该阀门控制器带有工业现场总线PROFIBUS－DP 的接口，可以实现阀门的远程控制和网络控制。本文主要的着力点为介绍利用PROFIBUS－DP 专用芯片SPC3 开发PROFIBUS－DP 设备中需要注意的一些问题，包括硬件接口设计，有关PROFIBUS－DP 规范标准的一些设计要点，以及利用PROFIBUS－DP 诊断功能的方法。本文对设计其它Profibus DP从站节点有很好的参考价值!-This paper presents a general valve control valve controller design program The valve controller with industrial PROFIBUS-DP interface. The valve can be achieved remote control and network control. This paper mainly focus on the use of PROFIBUS-DP SPC3 ASIC development PROFIB U.S.-DP equipment necessary to pay attention to a number of issues, including the hardware interface design, The PROFIBUS-DP standards in a number of design features, and the use PROFIBUS-DP diagnostic function method. In this paper, the design of other Profibus DP slave nodes are of value!

基于Linux防火墙的嵌入式网络流量控制系统，可供学习linux的人员参考。-Linux-based embedded firewall network traffic control system, learning linux for the reference.

Introduce the wishbone bus .

华为 Quidway 系列多协议路由器，支持 PPP、FR、X25、SLIP、HDLC 等网络协议，用户可通过各种广域网线路接入 Internet 及互联互访。 路由器内置安全防火墙、NAT、RADIUS 安全认证，以及 CALL BACK 等多项互联安全防护功能；并通过 CA 认证协议的验证和 IPSec 隧道协议，在 Internet 上构建安全可靠的网络通道，基于硬件的数据加密，将保密数据加密后在隧道上传输，加密数据有可靠的保密性但牺牲了效率；非保密数据可以通过一般性安全处理在隧道上传输，保证较高的转发速率。硬件加密的算法采用专门的芯片（经过国家相关部门批准）进行加密，密钥长度大于 128 位，并提供高强度的一次一密功能。配合完全自主知识产权的软硬件平台，提供网络的安全互联和数据的安全传输的安全解决方案。 而 "备份中心"的可靠性备份解决方案，实现多种线路之间的任意备份和业务分担，为网络提供业界最坚固的保护屏障，保证网络的可靠运行。-Huawei Quidway series of multi-protocol routers to support PPP, FR, X25, SLIP, HDLC and other network protocols, users can through various WAN lines and Internet access to the Internet visits. Built-in security firewall router, NAT, RADIUS authentication, and a number of other CALL BACK Internet security protection functions; And through CA and validation of the agreement IPSec agreement on the Internet to establish a secure and reliable network access, hardware-based data encryption, data encryption confidentiality the tunnels on the Tunnel, a reliable data encryptio

基于SoPC的嵌入式二维条码识读系统使用集成在QuartusII中的SoPC Builder开发组件配置生成片上系统,结合降噪处理、背景分离 图像校正、图像二值化、码字识别、信号纠错等技术，处理由OmniVision OV7649 CCD产生的条码图像。-SoPC based embedded system uses two-dimensional bar code reader integrated in QuartusII development of SoPC Builder component configured to generate system-on-chip, combined with noise reduction treatment, the background separation image correction, image binarization, character identification code, the signal error correction technologies such as treatment by the OmniVision OV7649 CCD barcode images generated.

这是我设计的一个图书馆管理系统,请贵站给予指点和评析-This is my design of a library management system, please Guizhan give guidance and assessment

学习嵌入式浏览器的很好的参考资料。对embeded linux下的konqueror浏览器作了深入的分析。-learning Embedded Browser is a good reference. Embeded linux right under the konqueror browser-depth analysis.

以及进行组态。因此构建一个在工业过程监控中应用的系统平台。在 系统开发中在国内我们首次将PI}FIBLTS现场总线技术通过代/104总 线与WIDE操作系统和运行在WINCE操作系统上的组态软件IV}GSE结 合起来，进行了全新的研究尝试，少}取得了一定成果，为系统的进- 步完善打卜了一定基础。 -As well as configuration. So to build a industrial process monitoring application system platform. In System Development in China the first time, we will be PI) FIBLTS fieldbus technology generation/104 bus and WIDE in the WINCE operating system and run the configuration software operating systems IV) GSE combine a new study try, less) achieved certain results, for the system into- further improve the playing BU a certain foundation.

PKE（被动无钥门禁系统，汽车车门控制）整个系统基站部分原理图。-PKE (passive-keyless-entry system, car door control) base station part of the whole system schematic.