功能单位

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。

Objective To explore the clinical value of color Doppler ultrasonography in the diagnosis of acute epididymitis.

作者：冯郑娟，刘炎军作者单位：达州市中心医院功能科目的探讨彩色多普勒超声用于诊断急性附睾炎的临床价值。

Because serum free estriol was composed by fetus-placenta unit, dynamic monitoring serum free estriol content in pregnancy was one of the important targets of understanding fetus-placenta normal functions, so it also has important clinical value.

妊娠期FE3主要由胎儿-胎盘单位合成，因此动态监测孕妇血清FE3的含量，是了解胎儿-胎盘功能正常与否的重要指标之一，具有重要临床价值。

Jing is a fundamental structure of Qihua which can't express any defference of future life at stage of Jing; Yin Yang expresses the evolution regularity of life which has defferent nature; five elements expresses a team of natural number which under five elements and it contral life to evolute at five stages.

生殖之精，是生命基本的化演单位，气化之宇。阴阳，表达生殖之精依靠气化，演化出的具有某些相对的可比较属性。五行，是反映生命体在气化作用下，同源演化区域里生命结构或功能渐变的五大变化序态。

This module an extension to E-PAS Production Control and allows for processing of non-standard or project-oriented orders, optionally to be divided into suborders .

特殊定单模块扩充了生产控制模块的功能，是用于处理那些非标准的或者以项目为核算单位的定单并可以由母生产订单生成子生产订单。

On Thursday, US District Court Judge David Folsom granted an injunction in favor of TiVo's claim-barring further sale of the boxes and ordering Echostar to disable the DVR function in all its units within thirty days.

对周四，美国地方法院法官大卫福尔松获得禁制令，有利于TiVo公司的索赔，禁止进一步销售的箱子及订购EchoStar公司禁用的DVR功能，在其所有单位三十天。

Motivation is driving power of behavior. Furthermore, place attachment refers to the functional dependence and identity expression of place to an individual person. Thus,, if the tourist's motivation and place attachment of an ecotourism destination can be known, not only can provide the functional utilization and emotional satisfaction to tourists, the methods of environment education and the visitor management strategy to the tourists of various motivation types can be dealt by the managerial sectors.

动机是行为驱动力量，而场所依恋则是指人对地方所表达出来的功能性依赖与情感认同上的连结，因此，若能了解生态旅游地游客动机和场所依恋，不仅能提供游客在场所功能使用及情感上的满足，更能使管理单位了解如何制定不同动机类型游客之更深广环境教育及管理策略。

The cell is the fundamental unit of the body structure and the function.

细胞是机体结构和功能的基本单位。

The cell is the fundamental unit of the body structure and function, and it has its independent special function and its minimum fundamental structure.

所谓基本单位，可以理解为细胞有它独立的特殊功能，也有基础的起码的结构。

The secretory function of a renal unit is dependent on the flow of blood through its glomerulus.

肾单位的分泌功能，取决于通过肾小球的血流。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。