技术

In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

Programming, Discrete Mathematics, Data Structures and Algorithms, Introduction to the Design and Analysis of Algorithms, Operating Systems, Compiler Principles and Practice, Computer Networks, Computer System Architecture, Embedded Systems and Applications, Database Systems and Applications, Formal Language and Automata, Software Engineering, Artificial Intelligence, Introduction to Computer Graphics, Software System Design, Software Project Management, etc.

主干课程：算法分析与设计、面向对象技术与应用、软件项目管理、软件体系结构、软件过程改进、计算机网络技术、网络与信息安全技术、软件测试技术、信息系统分析与设计、软件度量技术、数据库管理技术、软件平台与中间件技术、数据仓库与数据挖掘、软件需求工程、计算机图形学等。研究方向：软件工程与管理、软件理论与系统、信息系统与工程、计算机图形学与辅助设计。

Five novel torsion-mirror optical actuators including double-beam thickness differential structure with single torsional axis, double flexible folded-beam structure with single torsional axis, double-beam vertical torsion comb structure with single torsion axis, four-beam differential compound-micromirror structure with double torsional axis and the combined structure of the four basis forms above, are brought forward. All of these devices could be fabricated by the same silicon micromachining process we have developed. The deformation compensation design with local enhancement for the thin torsional beam which is the key structure of these devices is also put forward to improve the reliability. The three-dimension solid model and two-dimension reduced order model of the torsion-mirror optical actuator are established and then the numerical simulations for evaluating the device characteristics of the statics, dynamics, electrostatic field, mechanical and electrostatic coupling, fluid and solid coupling are carried out to optimize the structure design. Furthermore, three optical fibre clamping structures which could be integrated monolithicly are designed and analyzed to improve the optical coupling capability. 4. Three flexible process flows combined with bulk silicon micromachining and surface silicon micromachining are brought forward to fabricate these novel single-crystal silicon or polysilicon torsion-mirror optical actuators by using the same lithography masks for both SOI wafer and regular silicon wafer. A series of important process experiments are carried out to optimize the process parameters and the process flows. Some novel and typical process phenomena which occurred during the microfabrication are analyzed and then the corresponding solutions are put forward. 5. A MEMS dynamic testing system which exploit blur image synthetic technique, stroboscopic image matching technique, stroboscopic mirau microscopic interferometry technique and microscopic laser dopper vibrometer technique is set up to measure three-dimension and six-freedom micro motions of any MEMS devices with nanometer resolution.

在对硅微机械扭转镜光致动器的光机电特性系统地理论研究的基础上提出了硅微机械扭转镜光致动器的结构设计准则。3、提出了单轴双梁厚度差分结构、单轴双柔性折叠梁结构、单轴双梁垂直扭转梳齿结构、双轴四梁差动复合微镜结构以及以上四种基本结构组合后的衍生结构等五种工艺加工技术兼容的新型的硅微机械扭转镜光致动器，对器件关键结构薄厚度、高耐疲劳扭转梁进行了局部加强的变形补偿设计，建立了器件的三维实体模型以及两维降阶模型，对提出的新结构硅微机械扭转镜光致动器进行了系统的静力学、动力学、静电场、力电耦合和流体固体耦合的建模仿真与优化设计，同时设计并分析了三种可实现单芯片集成的弹性光纤定位夹紧结构。4、提出了组合体硅微加工技术与表面硅微加工技术、兼容同一套光刻版图、可分别基于SOI 晶片和普通Si 晶片、适应于制造提出的各种新结构单晶硅和多晶硅硅微机械扭转镜光致动器的三套柔性加工工艺流程，开展了一系列重要工艺步骤的单项工艺试验，对工艺流程与工艺参数进行了优化，针对加工过程中出现的具有普遍意义的典型工艺问题进行了讨论和分析，并提出了解决方法。5、创新性地将模糊图像合成技术、频闪图像匹配技术、频闪Mirau 显微干涉技术与显微激光多普勒测振技术有机结合，建立起了一套周期运动测量与瞬态运动测量相结合、单点运动测量与全视场运动测量相结合、满足不同MEMS 器件各种动态测试要求的集成的MEMS 三维六自由度微运动精密测量系统。

Some measurements and analyses of the electric parameters of arc welding power supply have been done using this system.

论文研制开发的多功能弧焊电源检测系统以虚拟仪器为技术平台，系统整合了包括电子技术、计算机技术、传感和检测技术、数字技术和虚拟仪器技术等在内的现代信息技术。

With the development of information technology,the research and application of remote failure diagnosis system are arising in the world.

1概述远程故障诊断的概念是在远程医疗概念的基础上发展起来的一种设备诊断技术，远程设备故障诊断技术是传统的故障诊断技术与网络技术、计算机技术和现代通信技术相结合的一种新型诊断技术，它是在工业现场的设备发生故障征兆或发生故障，现场的维护人员或故障诊断系统对其不能

Partner of strategy of happy according to actor friend general exclusive technology, canada is inspected honour group (Liu Feng of general manager of HeadPlay) Beijing company introduces,"' happy sow ' place uses is " Freefall free falling body video is compressed / solution presses a technology, this technology is compressed for the video with the at present most advanced whole world / solution presses a technology, use unique graphical details and bandwidth to forecast allocate a technology, all crucial detail that naked eye of the mankind below can meticulous reservation needs to video place and will other naked eye cannot differentiate part makes special processing, avoid a tradition to compress a technology to be in with advanced figure technology tall analytic / when small bit is led, right fast / sophisticated act and the mosaic that setting produces or color piece disintegrate phenomenon.

据优朋普乐独家技术战略合作伙伴，加拿大视尊集团北京公司总经理刘峰介绍，" '乐播'所采用的是"Freefall自由落体视频压缩/解压技术，此技术为目前全球最先进的视频压缩/解压技术，采用独特的图形细节与带宽预测分配技术，能细致的保留下人类肉眼对影像所需的所有关键细节并将其他肉眼无法判别部分作特殊处理，并以先进演算技术来避免传统压缩技术在高解析/低比特率时，对快速/复杂的动作及场景产生的马赛克或色块的瓦解现象。

What's more, we also study some key techniques and realization difficulties of image authentication in-depth, including referent block to help tamper localizing, sign bit adjustment for binary encoding, mean quantization improvement, diagonally extension to help tamper localizing, and discard isolated error point to tolerate incidental distortion. These techniques can be used for good reference to the development of image authentication technique.

此外，我们还对数字图像鉴别的一些关键技术和实现难点进行了深入研究，主要包括有：参考点辅助定位技术、二值编码中的符号处理技术、均值量化方法的改进技术、对角扩展和去除孤立点技术等，这些技术的研究都对数字图像鉴别技术的发展具有很好的借鉴意义。

For example, machining centers and flexible manufacturing technology, break through the many varieties of case processing technology difficulties; spiral bevel gear machining technology to solve high-speed sewing machine driving accuracy and functioning of the key issues of noise; holes line grinding processing technology to meet the needs a key-hole parts precision and roughness of the basic requirements; sphere processing technology, adapted to the high-speed packet transmission machine components both inside and outside the spherical exercise the continuous improvement of machining accuracy; precision casting process technology and advanced heat treatment technology for the development of industrial machine effective support.

例如，加工中心及柔性制造技术，通过对案件的处理技术困难，许多品种突破；螺旋锥齿轮加工技术来解决高速缝纫机发球准确率和噪音的关键问题发挥作用；孔磨削加工技术路线的满足需求的关键孔零件的精度和粗糙度的基本要求；领域的加工技术，适应高速数据包传输内外球面行使加工精度的不断提高机械零件，精密铸造工艺技术和先进的热为工业机器处理技术发展的有效支持。

In order to confront with the increasingly complicated electromagnetic environments and adapt to the development necessary of the integrative electronic warfare,this paper studies the integrative reconnaissance technology for radar and communication signals from single-platform,analyzes the characteristics of radar and communication signals in detail from the different aspects of the electromagnetic frequency band,function,power,signal waveform and modulation mode,researches some key technologies to realize the integrative reconnaissance for radar and communication signals,such as integrative microwave front technology,digital receiver technology,digital signal processing and modularity technology,especially analyzes and researches the integrative signal sorting and identification technology deeply.

为对抗日益复杂的电磁环境，适应一体化综合电子战发展的需要，对单平台雷达/通信侦察一体化技术进行了研究。从电磁频段、功能、功率、信号波形及调制方式等不同角度，详细地分析了雷达与通信信号的特点；对实现雷达/通信侦察一体化的一体化微波前端技术、一体化数字接收机技术、一体化数字信号处理技术、模块化技术等关键技术进行了研究，尤其是对一体化信号分选、识别技术进行了深入的分析研究。

Differing the traditional technology from modern one, the former is further classified into the following three types in view of that who owned the technologies, i.e., monkish, public and royal.

技术可以分为现代技术和传统技术，在此基础上，把传统技术区分为三种类型，即从属于僧侣的技术、从属于民众的技术和从属于宫廷的技术。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。