论网络环境下如何预防电脑病毒感染

现代网络环境下,电脑非常容易受到病毒的感染,严重影响着电脑的正常运行,轻者会导致电脑的部分程序受到"感染",严重者会使得电脑处于瘫痪状态.本文就是针对网络环境中电脑病毒的一些新特点进行介绍和分析,然后针对这些出现新特点的病毒进行预防,以对电脑更好地进行保护.     

可视化建模在数据库管理系统设计中的应用分析

数据库管理系统对于目前网络信息时代是十分重要的后台管理系统,其开发所面对的系统也越来越复杂,给设计人员带来了较大的麻烦,因此可视化建模就成为了其设计中不可或缺的辅助工具,在UML技术的支持下,此技术得到了广泛的应用.     

CAD/CAE公共服务平台中资源共享智能型系统研究

在产业技术公共服务平台的影响和带动下,随着其用户规模不断扩大和信息技术的发展,越来越要求平台服务向智能化发展,有必要对其中之一的资源共享智能型系统建设进行探讨。     

Study of diffusion mobilities of Nb and Zr in bcc Nb–Zr alloys

On the basis of the available thermodynamic parameters, the atomic mobilities of Nb and Zr in bcc Nb–Zr alloys are critically assessed as functions of temperatures and compositions by the CALPHAD method, where self-diffusion coefficients, impurity diffusion coefficients, tracer diffusion coefficients, interdiffusion coefficients and concentration curves are simultaneously optimized. Comparisons between the calculated and experimentally measured diffusion coefficients are made, where good agreement is evident. In addition, the obtained mobility parameters can reproduce a reasonable concentration profile for the Nb/Zr diffusion couple annealed at 1868 K for 5400 s.     

使用HTTP Tunneling技术实现穿透网络防火墙的通信

近年来,防火墙在网络中得到了广泛的应用.它能够比较有效地防范病毒与黑客的攻击,保护网络的安全.但是也带来了一些不利影响,使一些需要进行网络通信的应用软件系统不能正常工作.介绍一个解决方案,并且重点介绍通过HTTP Tunneling技术使用基于文本的HTTP协议传送二进制数据的方法.     

面向业务问题求解的知识供应过程模型

为了满足企业在业务问题求解方面的实际需求,提出了一个面向业务问题求解的知识供应过程模型。该模型提出了知识供应过程中的问题空间、知识空间和流程空间的概念及其关联关系,并进一步给出了包含知识的获取、评价、存储和重用的知识供应过程的有关算法。该模型与算法将业务问题求解过程与知识供应过程进行了融合,通过关联关系实现了知识的主动供应,在优化了业务问题求解过程的同时,提高了知识积累的质量和知识重用的效率。基于该模型建立了知识管理问题求解的原型系统KMPSS,并得到了初步应用验证。     

浅论互动式教学在计算机专业教学中的应用

本文针对计算机专业学生学习计算机算法语言存在的问题,引用互动式教学的理论,设计了互动式教学模式,即"建-仿-读-改-写",提出了互动式教学的环境要求,分析了互动式教学的教学效果,基本形成了一套完整的教学方案。对提高计算机专业教学效果具有一定的指导意义。     

TrajStat: GIS-based software that uses various trajectory statistical analysis methods to identify potential sources from long-term air pollution measurement data

Statistical analysis of air mass back trajectories combined with long-term ambient air pollution measurements are useful tools for source identification. Using these methods, the geographic information system (GIS) based software, TrajStat, was developed to view, query, and cluster the trajectories and compute the potential source contribution function (PSCF) and concentration weighted trajectory (CWT) analyses when measurement data are included.     

A Services University

The service-oriented architecture (SOA) has become a widely adopted architectural framework for the information industry to achieve improved scalability, reusability, and cost-efficiency. The use of SOA and related information technologies to modernize the services industry is creating huge challenges due to the lack of skilled practitioners and educators. To address those challenges, the author presents the services university as a skills scale-up model that includes innovative training content and delivery practices. Schools, research institutes, and commercial companies can leverage the presented model to deliver course offerings and training programs in an extensible and systematic way.     

Creep effect on dynamic visco-elastic properties of polymer matrix composite

This paper deals with the creep effect on dynamic visco-elastic properties of short fibre reinforced polymer SMC composite. The vibration-creep-vibration test procedure was applied to examine the influence of creep on dynamic modulus E and loss tangent tg of the material. The results show that creep causes appreciable influence on E and tg.