计算机网络安全与防范措施浅析

信息时代,计算机网络在现代社会之中得到了更为广泛的应用。计算机网络安全不但属于个人信息安全的狭义层面问题,更加是国家、社会、公共信息的安全问题。一旦计算机网络存在安全问题,导致的不但是庞大的经济损失,还有可能对国家安全形成威胁影响。由此可见,计算机网络安全已经成为世界范围内的重要事项。该文就计算机网络安全存在的隐患问题进行研究,并制定了科学有效的防范措施。对提升计算机网络系统整体安全水平,营造可靠、优质的网络应用环境,提升实践工作效率,符合新时期快速发展需要,有重要的实践意义。     

计算机网络安全与防范措施浅析

信息时代,计算机网络在现代社会之中得到了更为广泛的应用。计算机网络安全不但属于个人信息安全的狭义层面问题,更加是国家、社会、公共信息的安全问题。一旦计算机网络存在安全问题,导致的不但是庞大的经济损失,还有可能对国家安全形成威胁影响。由此可见,计算机网络安全已经成为世界范围内的重要事项。该文就计算机网络安全存在的隐患问题进行研究,并制定了科学有效的防范措施。对提升计算机网络系统整体安全水平,营造可靠、优质的网络应用环境,提升实践工作效率,符合新时期快速发展需要,有重要的实践意义。     

计算机网络安全管理探讨

现阶段,伴随着我国社会体制建设以及科学技术发展的不断深化革新,计算机相关技术在我国各行业领域中正不断得到广泛的应用.由于计算机相关技术为我国企事业单位带来的效率提高,符合当下社会对办公工作形式便捷性的要求,计算机网络安全管理正成为我国计算机及互联网相关技术发展的重点方向.现就我国计算机及互联网相关技术的实际应用状况,分析计算机网络安全管理的相关探讨.     

计算机网络信息系统安全防护分析

为了适应现阶段计算机网络信息系统的工作要求,进行安全防护方案的优化是必要的,该文就计算机网络信息系统的威胁性问题及保护性方案展开分析,旨在提升计算机网络信息系统的安全性,适应现阶段计算机网络工作的要求.     

数据加密技术在计算机网络安全领域中的应用

随着信息技术在我国的发展,计算机网络安全已经成为了一个重要的要求。而对于计算机网络安全的防护作用,数据加密技术就是一个非常重要的手段。本文就对数据加密技术在计算机网络安全领域中的应用进行分析。     

计算机网络安全技术及其完善对策探究

随着计算机网络技术的飞速发展,防火墙技术、PKI技术、数据加密技术等计算机网络安全技术的发展也极为迅速,并被广泛应用到计算机网络安全中,对保障计算机网络安全有着不可替代的作用。在未来网络技术飞速发展下,计算机网络安全技术也应不断提高技术水平,这样才能满足计算机网络使用的要求,为用户提供一个安全可靠的网络环境。     

计算机网络实验课程体系探索

计算机网络实验的课程体系的建立必须符合实验教学课程体系整体要求,体现通识基础、技术应用和专业技术多层次的特性,满足多层次学生的不同需求,在计算机网络应用和计算机网络原理等课程的理论基础上,不断完善符合时代要求、紧跟网络技术发展的实验课程内容。本文介绍了我中心在此方面的探索经验。     

数据加密技术在计算机网络安全中的应用探讨

随着计算机技术的快速进步和网络通信的广泛应用，数据加密技术在计算机网络安全应用中越来越广泛。数据加密通过对数据进行加密处理，使得未经授权的用户无法获取其中的信息，确保数据在传输和存储过程中的机密性、完整性、可用性等基本安全要求。然而，在数据加密技术在计算机网络安全应用中的具体实践中，依然存在着各种问题，需要采取相应的对策进行应对。因此本文对数据加密技术概念进行介绍，分析数据加密技术在计算机网络安全中的应用领域，重点对数据加密技术在计算机网络安全应用中存在的问题及对策进行研究，并阐述数据加密技术在计算机网络安全应用的发展趋势，以提高数据加密技术在计算机网络安全中的应用效果，致力于计算机网络安全水平的提高。     

神经网络在计算机网络安全评价中的应用研究

随着信息技术的快速发展,当前信息技术被广泛应用于人们生活与生产的方方面面,对于网络安全评价的整体水平也提出了更高、更为具体的要求。为了进一步确认神经网络应用于计算机网络安全评价的作用,首先介绍了计算机网络安全评价体系的建立策略,其次分析了神经网络在计算机网络安全评价中的应用优势,最后结合上述内容阐述了神经网络应用于计算机网络评价系统的具体策略,希望能够为计算机网络安全评价体系的顺利建设提供借鉴。     

铁路计算机网络安全及防范措施

在对当前铁路计算机网络安全现状及需求进行分析的基础上,指出了当前铁路计算机网络面临的主要安全问题。同时,针对铁路计算机网络特点,构建了对应的铁路计算机网络安全系统以及信息安全管理体系,为提高铁路计算机网络安全水平,防范计算机网络安全风险提供了参考。     

基于渗流模型的影响力最大化算法

多数社交网络影响力最大化算法的研究只关注于所选种子节点集合的影响力是否最优,忽略网络自身传播影响力的固有能力。本文对网络进行渗流模拟,计算渗流后网络的主连通分量随着传播概率改变的趋势,并且求得主连通分量大小增加开始变快的相变点,从而计算网络自身传播影响力的固有能力。通过相变值与种子节点集合大小的换算,求得当前网络最佳的种子节点集合大小。将种子节点集合大小限制在最佳大小范围内即可获得最佳的影响力。在kareteclub、football、highschool和socdolphins社交网络数据集上进行实验,验证了该方法的有效性。     

Transmission of vertical vibration through a seat: Effect of thickness of foam cushions at the seat pan and the backrest

The perception of vehicle ride comfort is influenced by the dynamic performance of full-depth foam used in many vehicle seats. The effects of the thickness of foam on the dynamic stiffness (i.e., stiffness and damping as a function of frequency) of foam cushions with three thicknesses (60, 80, and 100 mm), and the vibration transmitted through these cushions at the seat pan and the backrest were measured with 12 subjects (6 males and 6 females). With increasing thickness, the stiffness and the damping of the foam decreased. With increasing thickness of foam at the seat pan, the resonance frequencies around 4 Hz in the vertical in-line and fore-and-aft cross-axis transmissibilities of the seat pan cushion and the backrest cushion decreased. For the conditions investigated, it is concluded that the thickness of foam at a vertical backrest has little effect on the vertical in-line or fore-and-aft cross-axis transmissibilities of the foam at either the seat pan or the backrest. The frequencies of the primary resonances around 4 Hz in the vertical in-line transmissibility and the fore-and-aft cross-axis transmissibility of foam at the seat pan were highly correlated. Compared to sitting on a rigid seat pan with a foam backrest, sitting with foam at both the seat pan and the backrest reduced the resonance frequency in the vertical in-line transmissibility of the backrest foam and increased the associated transmissibility at resonance, while the fore-and-aft cross-axis transmissibility of the backrest was little affected. Compared to sitting without a backrest, sitting with a rigid vertical backrest increased the resonance frequency of the fore-and-aft cross-axis transmissibility of the seat pan cushion and increased the transmissibility at resonance.Relevance to industryThe transmissibility of a seat is determined by the dynamic properties of the occupant of the seat and the dynamic properties of the seat. This study shows how the thicknesses of foam at a seat pan and foam at a backrest affect the in-line and cross-axis transmissibilities of the foams at the seat pan and the backrest. The findings have application to the design of vehicle seats to minimise the transmission of vibration to the body.     

A method of defuzzification based on the approach of areas' ratio

The new method of defuzzification of output parameters from the base of fuzzy rules for a Mamdani fuzzy controller is given in the paper. The peculiarity of the method is the usage of the universal equation for the area computation of the geometric shapes. During the realization of fuzzy inference linguistic terms, the structure changes from the triangular into a trapezoidal shape. That is why the universal equation is used. The method is limited and can be used only for the triangular and trapezoidal membership functions. Gaussian functions can also be used while modifying the proposed method. Traditional defuzzification models such as Middle of Maxima − MoM, First of Maxima − FoM, Last of Maxima − LoM, First of Suppport − FoS, Last of Support − LoS, Middle of Support − MoS, Center of Sums − CoS, Model of Height − MoH have a number of systematic errors: curse of dimensionality, partition of unity condition and absence of additivity. The above-mentioned methods can be seen as Center of Gravity − CoG, which has the same errors. These errors lead to the fact that accuracy of fuzzy systems decreases, because during the training root mean square error increases. One of the reasons that provokes the errors is that some of the activated fuzzy rules are excluded from the fuzzy inference. It is also possible to increase the accuracy of the fuzzy system through properties of continuity. The proposed method guarantees fulfilling of the property of continuity, as the intersection point of the adjustment linguistic terms equals 0.5 when a parametrized membership function is used. The causes of errors and a way to delete them are reviewed in the paper. The proposed method excludes errors which are inherent to the traditional and non- traditional models of defuzzification. Comparative analysis of the proposed method of defuzzification with traditional and non-traditional models shows its effectiveness.     

基于XML的中间层交互技术的研究

由于HTML自身的不足．所以无法适应Web发展的复杂性和多变性，也不利于机器之间的数据交换和信息传递，通过对XML和HTML作多个角度的对比，文中提出将XML作为载体实现Web上的动态交互。首先从XML的自身特点出发，分析了XML驱动下的Web体系结构，从而得出基于XML的中间层交互技术的实现原理．重点研究了如何设计与XML相匹配的Web数据库，用XML查询数据库的实现方法，以及如何构造从XML到数据库的映射关系，具体包括从XIviL的DTD或者Schema出发来设计数据库的结构或者从数据库本身出发来构造与之相适应的DTD或Schema，最后分析了浏览XML格式信息的诸多策略。     

OpenFlow技术与商业价值

针对目前流行的OpenFlow技术,本文提出OpenFlow的标准进展、商业价值和连通性测试。该方法根据控制层面和转发层面相分离的技术,采用移动研究院内网拓扑进行测试。实验结果表明,通过在BigSwitch controler上进行相关命令配置就可实现二层的OpenFlow交换机互联的不同网段主机的通信。OpenFlow是SDN技术中一种关键的接口协议,SDN是对网络的抽象, OpenFlow是对单个转发面设备的抽象。OpenFlow交换机和Control er的出现为新型互联网（NGN）体系结构的研究提供了实验途径。     

Teacher education in IT in Germany

Abstract In 1988 the eleven West-German Kultusminister , with responsibility for the school systems in their respective Bundeslaender , reached agreement with the Federal Ministry of Education and Science on the broad concept of 'Information and Communications Technology', ITG. After four years of discussion it was agreed that ITG should be introduced into the secondary level of the general schools. In spite of strong disagreements about the ways and speed of implementation, and after several years of experiments, important parts of the concept have become a reality in practically all of the old Bundeslaender. While acknowledging the complexity of the German educational system the paper attempts to outline the development of the concept of Information and Communications Technology and its consequences in teacher education. The development in the eastern part of Germany, the former GDR, has been completely different to that in the western part and this is also commented upon in the paper.     

融合分区与Canny泛函的水平集对猴脑提取的研究

The traditional level set has randomness in the location selection of the initial contour, and lacks the processing of edge information. Therefore, accurate extraction of brain tissue edges cannot be achieved. Therefore, firstly, the level set algorithm of fusion partition and Canny functional fuses the idea of partition and combines the morphological information of each region to complete the initial contour position selection, so that the initial contour contains more brain tissue, and improve the efficiency of brain tissue extraction. Secondly, the Canny operator is integrated into the energy functional, which improves the accuracy of detecting the edge of the macaque brain tissue while retaining the superiority of the traditional level set on the uneven grayscale image. Results show that the algorithm achieves accurate extraction of macaque brain tissue with an accuracy of up to 86%.     

可拓聚类的科教人际网络节点重要性动态分析方法

目前大多数研究对复杂社会网络关键节点影响力的识别都是静态的，缺乏动态变化的分析。采用可拓聚类方法对动态变化下的科教人际网络进行量化分析，首先以多属性决策法计算每个节点重要性，再利用变异系数权重法计算得该节点综合重要性量值，之后划分等级并取标准正域和正域区间，利用可拓关联函数计算每个节点与每个等级的关联度，关联度值最大的等级即为该节点对应等级，最后分析同一社会网络节点在不同时间点的重要性等级变化。可拓聚类方法尝试从动态上对网络节点重要性进行把握，最后通过实例验证了该方法的有效性。     

An approach to the synthesis of fuzzy stabilization systems with a priori unknown model of an object

A method of synthesis of fuzzy stabilization systems for a broad class of dynamic objects under the assumption that the mathematical model of the object is not known a priori is proposed. The control is formulated in the form of a proportional law of adjustment as a function of a macro-variable; the square of the Euclidean norm of the phase variables is adopted as the macro-variable. An analogous variable characterizes the distance of the object from the equilibrium position. Despite the simplicity of the control law, its sign remains constant due to the fact that the macro-variable is positive-definite over the entire phase space. The switching times of the signals are determined by fuzzy identification of the system’s dynamic modes on the basis of measurement of the derivatives of the macro-variable.     

基于遮挡关系推理的输电线路图像金具检测

实现输电线路图像典型金具的精准检测是进行其缺陷检测的前提。针对通用目标检测模型对密集分布、遮挡严重的金具检测精度较低、易出现漏检等问题,提出了一种结合金具间遮挡结构信息和场景关联信息的典型金具检测方法。基于经典的Faster R-CNN模型提取金具特征作为节点,提取整张图像特征作为金具场景关联信息,学习金具标注框间相交区域信息作为金具遮挡关系信息,并采用图同时建模金具特征、场景关联信息和遮挡关系信息,通过门控循环单元信息传递机制构建结构推理模块完成金具类别和位置的联合推理检测。为了验证所提方法的有效性,选取了8类存在遮挡连接关系的金具进行实验,其中,原始Faster R-CNN模型的mAP值为81.30%,改进模型的mAP值为84.15%。实验结果表明,本文方法一定程度上提高了遮挡严重金具的检测精度,为后续的金具故障诊断奠定良好的基础。