数字化技术对视觉传达中的设计符号的影响

现今流行的一些书籍、期刊杂志、广告、招贴、网页等,已看不到长篇累牍的枯燥文字,取而代之的是用大量生动、吸引人的图片、插图、版式以及视觉整体设计来表达内容。一些设计精良的图书,“图文”各占的比例正在偏向“图”,真正做到了”图文并茂”。这种设计方式正在成为人们喜闻乐见的形式。计算机技术的飞速发展,印刷系统的各种新形式,软件的开发利用,以及网络技术、多媒体技术的应用等,更使大众传媒的视听表现获得了前所未有的创造空间。     

改进的UCGD软件体系结构设计方法

软件体系结构设计方法越来越受到研究者和实践者的重视,本文概述了软件体系设计方法主要分类,分析了非功能需求及用例技术的作用。详细阐述了使用UCGD方法进行软件体系结构设计的步骤,结合鲁棒性分析等技术,探讨了UCGD多个方面的改进,在计算机围棋系统架构中进行了初步尝试。     

Preparation of Nanoporous Thermal Insulating Materials and Their Application as Ladle Linings

The nanoporous thermal insulating material was prepared by using fumed silica,SiC powder and glass fiber as starting materials,the appropriate thickness of the nanoporous thermal insulating material lined in ladle was discussed by the simulation method,and the effect of its application as ladle lining was investigated.The results show that the thermal conductivity of the nanoporous thermal insulating material prepared in composition of fumed silica： SiC powder： glass fiber =75： 20：5 （in mass） is 0.023 W · m^-1 · K^-1 at 1 000 ℃,the appropriate thickness of the nanoporous thermal insulating material lined in ladle is ≤ 5 mm and the average temperature of the ladle outside surface when lined with the nanoporous thermal insulating material is 95 ℃ lower than that with the ordinary thermal insulating material.     

企业信息系统安全的现状与展望

从网络威胁、网络安全漏洞、网络攻击等安全经典案例，论述了其理论和方法，并对案例提供相应的对应策略和解决方案。从微软新一代操作系统Windows Vista的安全特性，论述了企业信息系统安全的前景和趋势。     

Influences of Al and Si Powders on Microstructure and Hot Mechanical Properties of Al2O3-C Slide Plates

The basic formulation of Al2O3- C slide plates was65%( in mass,the same hereinafter) white fused corundum particles,25% white fused corundum fines,6% active α-Al2O3 micropowder,4% carbon black and flake graphite, and additional 4% phenolic resin.Based on this formulation,3% Al powder,3% Si powder,and 3% Al + 3% Si powder were used to substitute equivalent white corundum fines to improve the hot mechanical properties of Al2O3- C slide plates. The specimens with dimensions of 140 mm × 25 mm × 25 mm were pressed at 150 MPa,dried at 200 ℃ for 24 h,and hot treated at 1 400 ℃ for 3 h in carbon embedded condition. Then hot modulus of rupture and thermal shock resistance of the specimens were tested and the phase compositions and microstructure were analyzed. The results show that specimen with 3% Al powder has the higher hot modulus of rupture but lower residual modulus of rupture after thermal shock than the specimen with3% Si powder; the specimen with 3% Al + 3% Si powders exhibits the highest hot modulus of rupture and the best thermal shock resistance; the change of mechanical property is closely related with the in-situ formed nonoxides: AlN in the form of bars is formed in specimens with Al powder; fibrous SiC whiskers are formed in specimens with Si powder; in the specimens with both Al and Sipowders,besides AlN and SiC whiskers,hexagonal tabular SiAlON is in-situ synthesized,which interlocks with each other.     

多媒体教学资源中的数字视频技术

视频技术是教学资源应用中的重点和难点,目前教学资源中对视频信号采集、存储和压缩都存在着一定的困难。但随着计算机技术的不断发展,数字视频在教学中的应用越来越广泛。本文将论述数字视频的特点,数字视频的压缩格式,以及数字视频技术教学过程中的应用：     

“工学结合,项目驱动”的高职高专计算机基础课程改革新思路

分析高职高专院校计算机基础教学的现状,结合当前职业教育的办学背景,提出高职高专院校计算机基础教学改革的新思路——工学结合,项目驱动。探讨该模式在职业院校计算机基础教学中,对教学理念、原则、设计及其实施等问题的影响。     

基于PV原语的进程同步与互斥问题分析

本文讨论了操作系统进程并发管理中的同步和互斥问题,并在分析的基础上引入P、V原语,用来描述进程操作。为了说明问题,分别给出了用P、V原语描述进程同步和互斥的典型实例。     

应用于广电网络的MPLS VPN技术

MPLS(Multiprotocol Label Switching-多协议标签交换技术)是一种在开放的通信网上利用标签引导数据高速、高效传输的新技术。它的价值在于能够在一个无连接的网络中引入连接模式的特性;其主要优点是减少了网络复杂性,兼容现有各种主流网络技术,能降低50%网络成本,在提供IP业务时能确保QOS和安全性,具有流量工程能力。此外,MPLS能解决VPN扩展问题和维护成本问题。     

VLAN技术在局域网中的应用初探

社会信息化水平不断提高,它影响着我们生活的各个方面。各个企业、单位组建自己的局域网,并且规模在不断扩大,网络变得越来越拥挤,冲突不断产生,管理难度日益加大。局域网组建VLAN网段的要求也越来越高,客观上要求LAN本身的结构可以实现动态组建、调整和管理。为了有效地提高网络管理的灵活性,提高网络效率和网络安全性,充分合理地进行VLAN划分是必需的。     

Influencing Factors of Properties of Castables for Hot Blast Stove Pipes

In order to prolong the service life of castables for hot blast stove pipes,effects of SiO2 micropowder addition and aggregate kind on properties of castables for hot blast stove pipes,and properties of silica sol bonded castables were researched using homogenized bauxite,andalusite particles,andalusite fines,white fused corundum fines,α-Al2O3 micropowder,pure calcium aluminate cement,SiO2 micropowder,and silica sol as starting materials. The results show that:(1) as SiO2 micropowder addition increases,the shrinkage rate of fired specimens increases; BD increases firstly,reaches the highest at 4 mass%,and then decreases; CMOR and CCS of all specimens increase gradually; so the appropriate SiO2 micropowder addition is 4 mass%;(2) the specimens with bauxite aggregate have better CCS and volume stability,but specimens with andalusite aggregate have better thermal shock resistance;( 3) for castables for hot blast stoves using silica sol as binder,the addition of pure calcium aluminate cement can decrease the linear change rate after treatment at 1 400℃ and can slightly enhance CCS and CMOR,but has very little influence on AP and BD; and the introduction of citric acid worsens the thermal shock resistance of specimens.     

Phase Evolution and Microstructure of C-AI System in Carbon-embedded Atmosphere

In order to investigate the phase evolution and microstructure of aluminum containing carbon composites,- 195 graphite flake and ≤0. 074 mm aluminum powders( Al 99%,in mass,the same hereinafter) were used as main starting materials. The mixture with 1 ∶ 1of graphite and aluminum was well mixed with additional 15% phenolic resin and then shaped in a hydraulic machine. The specimens were first dried at 250 ℃ for12 h,and then graphite-embedded fired at 800,1 000,1 200,1 400,and 1 600 ℃ for 3 h,respectively. XRD and SEM were used to characterize the phase compositions and section microstructure. The results show that at800 ℃ aluminum powder melts and reacts with carbon in resin forming granular Al4C3 at the edge of graphite;at 1 000 ℃,Al4C3 increases in amount and grows in volume,and AlN commences to form; at 1 200 ℃,some Al4C3 grows to tabular shape,and other Al4C3 nitridizes forming fibrous AlN; at 1 400 ℃,Al4C3 decreases because it is nitridized or oxidized forming fibrous AlN or Al2O3; at 1 600 ℃,Al4C3 disappears,AlN or Al2O3 gets big and coarse.     

基于JAVA/JSP的网上书店系统

JAVA语言是Internet上大型的WEB程序开发时使用得最热门的编程语言,本文描述了JAVA和JSP技术的特点以及在互联网上的使用情况,介绍这两种技术的重要编程和两者之间的联系,并完成一个基于这种技术的网上书店系统。     

数字签名方案的可证明安全性注记

本文首先回顾了可证明安全性的发展过程,并在RO模型和标准模型下介绍了几个有代表性的可证明安全的数字签名方案,最后指出了有待进一步研究的问题。     

基于NET的SQL注入攻击与防护措施研究

SQL注入是黑客攻击web站点的一种常见手段。本文对SQL注入攻击的定义、产生原理以及常见的攻击方式做了比较详细的阐述,并对基于.NET框架下的防护措施进行研究,从错误信息页面的输出,控件输入,sql语句参数化,利用Linq技术等方面总结出一些防护SQL注入攻击的措施,旨在对网站开发者在建站的安全性上有所提高。     

在网上证券交易中构建一种新认证系统

证券交易用户量的激增,使得网上证券交易前号一片光明。而传统的网上证券交易认证系统的安全可靠性能极大的威胁到了客户的交易安全。本文针对提高网上证券交易认证系统的安全可靠性,结合当前语音识别技术和动态随机密码认证的各自优点,提出一种结合动态随机密码和语音识别技的新认证系统。     

基于MVC模式的气象科技专家库设计与实现

本文对河南气象科技专家库的设计思想和功能进行了较详细的描述,采用JSP+Servlet+JavaBean实现MVC的体系结构,借助河南气象科技管理管理信息系统平台,设计出界面友好、通用性强、易于开发和维护的科技专家库。运行后的专家库不仅能够高效管理专家的相关信息资源,并且能够快速提供全面和准确的专家信息。     

基于c#的合约式包装器的设计方案研究

实现了一个C#语言的合约检查工具,用于辅助程序员在用C#语言编写软件的时候运用合约式设计方法。工具将书写在程序注释中的合约提取出来,并转化为类不变式、类方法的前置条件或后置条件的检查代码插入到源文件中。当执行含有合约检查代码的源文件的时候,检查代码将被执行,以确保合约是否被遵守。     

计算机概念教学的内容及对策

介绍有关概念教学的重要性及在概念教学中重视培养学生的思维能力、概念教学过程中应注意的问题和概念教学中采取的包括淡化、浅化、深化、跨越,在概念教学中应注意的问题,     

嵌入式系统IAP在GPRS远程集中抄表系统中的应用

介绍IAP（在应用编程）方法及其相关应用,以及将IAP应用于嵌入式系统设备软件远程升级的现实意义;结合某地区远程集中抄表系统,着重阐述采用GPRS无线通信进行远程软件升级的思想和实现方法,以及应用中应注意的一些关键技术,并讨论了提高GPRS远程升级速度和可靠性的一些措施。