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The network security is an affected area very widespread question, the topic research content: The network security rank, the data encryption technology, the firewall technology concept, the function, introduced the network security faces main threat as well as question countermeasure, and through the example some company network analysis situs chart from the analysis network security movement environment explained the example plan as well as supplements four safe disposition.

网络安全性是一个涉及面很广泛的问题，课题研究的内容：网络安全级别、数据加密技术、防火墙技术的概念、作用，介绍了网络安全面临的主要威胁以及问题的对策，并且通过实例某公司网络拓扑图从分析网络安全的运行环境来说明实例方案以及补充四点安全的配置。

The interconnection equipment electric cable is longest may reach 5 m, reaches 5 level of analysis situs connections through the USB concentrator by the chrysanthemum chain analysis situs form realization, but outside meets 127 USB equipment.

连接设备的电缆最长可达5 m，通过USB集线器以菊花链拓扑形式实现多达5级的拓扑连接，可外接127个USB设备。

The linear system optimum control theory distributes one of parameter systembasic topics,in domains and so on aerospace,national defense,finance,communicationhas the widespread application prospect.simultaneously, because the research tech-nique involves to foundation mathematics theories and so on the functional analysis,analysis situs,geometry, algebra.

线性系统的最优控制理论是分布参数系统的基本课题之一，在航空航天、国防、金融、通讯等领域有着广泛的应用前景。同时，由于研究手法涉及到泛函分析、拓扑学、几何学、代数学等基础数学理论。

The interconnection equipment electric cable is longest may reach 5 m reaches 5 level of analysis situs connections through the USB concentrator by the chrysanthemum chain analysis situs form realization but outside meets 127 USB equipment.

该文依据的是USB1.1协议规范，总线一共4根：5V电源线、地线及两根以差分形式驱动的数据线D＋、D－。连接设备的电缆最长可达5 m，通过USB集线器以菊花链拓扑形式实现多达5级的拓扑连接，可外接127个USB设备。

Sometimes the linear principal component analysis works inadequately when the data are nonlinear. In this paper, a new nonlinear analytic method, principal curve component analysis (PC~2A) is proposed.

对线性数据，PCA能保证降维后信息损失最小；然而，对占多数的非线性数据，这种线性分析方法受到较大的限制，用它分析数据可能会造成大量信息丢失。

But the building safety incidents' reasons are complex, the qualitative analysis is easy, the quantitative analysis is difficult, the common forecast model is tendency analytic method, return analytic method, index smoothing procedures and so on.

论文《灰色理论及神经网络在建筑伤亡事故预测中的应用研究》以1994-2007年全国建筑业死亡人数为基础数据，建立了灰色预测模型和BP神经网络预测模型，对2008的建筑业死亡人数进行预测。

The analysis includes three aspects:(1) The difficulty and reason of ultimate analysis's atomic hypothesis;(2) The difficulty and reason of analytic proposition's picture theory;(3) The difficulty between the proposition of Tractatus Logico-philosophicus itself and the anti-metaphysics proposition.

主要从三个方面来分析：(1)分析终极的原子性假设的困难及原因；(2)分析命题意义的图像论的困难及原因：(3)《逻辑哲学论》本身的命题与拒斥形而上学命题之间的困难。

Successively the analytic field set off the value analysis of law of value and contentions about different trends of reform, and finally the analysis became positive.

分析界也相继展开价值规律的价值分析，改革的不同取向之争和分析走向实证。

In the situation, this paper brought up the risk analysis and evaluation method on the basis of intelligent control and network communication technology for Network Communication System. The risk analysis and evaluation of Network Communication System firstly discussed the character of network communication and its risk. At the following we estimate a risk evaluation model according the distribution of the systems risk by time and space. Otherwise, we combined Fuzzy Comprehensive Evaluation with Analytic Hierarchy Process, and set up the multi-grade fuzzy comprehensive evaluation model for Network Communication System.

该方案主要通过讨论网络通信系统及其风险的特性，根据风险的时间和空间分布规律，以"风险"为整个网络通信系统安全模型的评估和分析对象，确立网络通信系统风险分布的量化评估模型，同时，就不同区域和不同时段的风险通过引入层次分析的一般方法来确定它们的权重系数，最后，通过模糊综合评判法则对系统中模糊不确定性因素进行数学化的抽象，建立一个反映其本质特征和动态过程的理想化的数学评估模型。

According to the traditional classification, analytical chemistry can be divided into chemical analysis and instrumental analysis.

按照传统的分类，分析化学可分为化学分析和仪器分析。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。