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External security threats to enterprise networks analysed according to the enterprise network LAN, WAN and external networks division to the Group respectively for easy analysis of the characteristics of network security, and to propose some solutions.

对企业网络的外部安全威胁进行了分析，试图根据企业网络在局域网、广域网和外部网络的划分来分别针对其组网特点分析容易产生的安全问题，并提出一些解决方法。

In this paper,we propose a novel feature selection method based on concept extraction and shielded level.

摘要］ 本文提出了一种新的基于概念抽取和屏蔽层的特征选择方法。

Then I find out the key factor of affecting China's sustainable development——the factor of population. Finally, I propose the strategies of China's sustainable development and.

在此基础上对影响中国可持续发展的关键因素——人口因素进行了较深入的分析，最后提出了中国的人口可持续发展战略和西部大开发战略。

It is the first important step in video analysis and will directly affects the effectiveness of indexing Shot boundary detection is one of our major research interests and we will tackle the following existing problems the ambiguity between gradual change and camera motion, the discontinuity during gradual change, false detection caused by illumination variation and flashlight, automatic threshold selection Firstly, we discuss shot boundary detection in non-compressed domain In chapter 2, we compare some of the commonly used detection methods which are based on frame difference and point out that single feature will not generate good results As a conclusion, we use fuzzy logic to combine multiple features Presently, most frame difference based shot boundary detection algorithms rely on threshold and hence the selection of such thresholds will greatly affect the performance of boundary detection We propose a membership function to define frame difference and calculate the membership with self adaptation according to the statistic distribution of frame differences to satisfy different type of video clips Experiments show that the proposed fuzzy shot boundary detection algorithm can be used with different video types and has a high detection precision and recall In chapter 3, we discuss model-based shot boundary detection algorithms regarding chromatic and spatial editing effects such as fade-in, fade-out, dissolve and wipe Various parameters are proposed to better describe the characteristics of each editing type.

镜头边界的检测是把视频自动地分割为一个个镜头，作为基本的索引单元，因此它是视频分析重要的第一步，直接影响到视频检索的成败。镜头边界的检测是本文研究的重点之一。目前镜头边界检测算法主要存在以下问题：渐变与镜头运动难以区别；渐变过程中的不连续与停顿、光照条件的变化及闪光灯等特殊情况会引起误检测；自动选择阈值比较困难等。本文首先针对非压缩域视频进行了镜头边界检测的研究。在第二章中我们采用了比较流行的基于帧间差的方法。在比较各种帧间差计算方法的基础上，指出使用单一的特征难以取得很好的检测效果，提出用模糊逻辑综合使用各种特征。目前大多数基于帧间差的镜头边界检测算法都采用阈值法进行镜头转换的判别。阈值选择的误差对检测性能有较大的影响，本文提出用隶属度函数定义帧间差较大、中等较大和较小等概念，并根据帧间差的统计分布自适应地确定隶属度，以适应不同类型的视频片断。实验结果表明这种基于糊逻辑的镜头边界检测算法可以适应不同的视频，并具有较高的检测精度和检出率。在第三章中采用基于模型的方法进行镜头渐变的检测，研究了淡入／淡出、慢转换和扫换的模型。

Although many key managementschemes for WSNs have provided mechanisms to examine the data integrity, theycan only address false data injection from outside adversaries rather thancompromised nodes. Therefore, we propose a key chain based false data filteringscheme called KAEF.

虽然用于无线传感器网络的许多****管理方案都提供了对数据真实性进行检验的验证机制，但它们仅能够防止由外部攻击者实施的虚假数据注入攻击，而无法处理由受损节点注入的虚假数据。

For the computation of the minimal covers of a family of sets, we propose several theorems to describe the principle, and develop corresponding algorithm elaborately.

而对于族集最小覆盖集的计算问题，本文则提出了若干个定理刻画了其计算方法的原理并予以正确性证明，并精心设计了相应的算法。

In addition, based on advanced hierarchical fan-in parallel combining image strategy, This dissertation also propose a new dynamic load balance strategy: group-of-taskpools/group-of-images.

基于先进的层次扇入(Hierarchical Fan-in)图象并行合成机制原理，提出了任务池组／图象组动态负载平衡策略。

They propose that he shall resume his job as farmhand.

他们建议他应重新做农夫的工作。

They propose d that he should resume his job as farmhand.

他们建议他重新做农场工人的工作。

Therefore the creators of benchmark farsightedly propose the more visual method of the results idea , comparing thespeed which shows the certain mean statistical system with the processor pentium III, working at the frequency 1 GHz.

因此创基准目光远大，提出更多视觉方法结果的想法，比较速度显示某些指统计系统与处理器奔腾三，在工作频率1千兆赫。

Smoking cigarettes adds to the Computer Desk Computer manufacturer computer mouse Computer Computerized collar knitter machine Conduit Bodies construction board Container Bag Control Arm Cooking Thermometer general levels of air pollution as well as damaging our health.

吸烟不仅对健康有害，而且增加空气污染程度。香烟雾含有多种有害物质：不仅有致癌化学物质、有某种能阻止氧气进入血液的气体，还有引起血压增高、心速加快的被称为尼古丁的物质。

He is one of my favorite actors.

他是我最喜欢的男演员之一。