基于CORBA的综合电子信息系统

根据未来高技术条件下局部战争对综合电子信息系统的需求,对综合电子信息系统集成方法进行研究,同时探讨一种基于自适配通信环境的实时CORBA分布式代理模型HeuORB。     

基于Flex的2.5维仿真校园电子地图系统的研究与实现

针对传统二维电子地图在表现能力、场景模拟和交互性能方面的局限性,研发出一款基于Flex的2.5维仿真校园电子地图系统(FVS-2.5DMAP),为广大师生和校外参观者提供一个适用于校内路线导航、招生和迎新宣传、校园实景展示、生活设施服务、校园规划建设等方面的逼真虚拟化三维电子地图平台。FVS-2.5DMAP采用基于Flex的三层B/S模式,并采用Arc GIS API for Flex和瓦片技术加载和展示2.5维仿真校园电子地图。系统测试结果表明,FVS-2.5DMAP具有良好的校园场景模拟效果、人性化的图形交互性能,以及较快的地图加载和响应速度。     

The First Principle Study on the Rectification of Molecular Junctions Based on the Alkyl-chain-modified Phenyl Benzothiophene Derivative

Using density functional theory(DFT) combined with nonequilibrium Green's function investigates the electron-transport properties of several molecular junctions based on the PBTDT-CH=NH molecule, which is modified by one to four alkyl groups forming PBTDT-(CH_2)_nCH=NH. The electronic structures of the isolated molecules(thiol-ended PBTDT-(CH2)_nCH=N) have been investigated before the electron-transport calculations are performed. The asymmetric current-voltage characteristics have been obtained for the molecular junctions. Rectifying performance of Au/S-PBTDT-CH=N-S/Au molecular junction can be regulated by introducing alkyl chain. The N3 molecular junction exhibits the best rectifying effect. Its maximum rectifying ratio is 878, which is 80 times more than that of the molecular junction based on the original N molecular junction. The current-voltage(I-V) curves of all the sandwich systems in this work are illustrated by transmission spectra and molecular projection density analysis.     

基于N-gram统计模型的搜索引擎中文纠错

搜索引擎中的关键词纠错是提高检索效率的一项重要辅助功能。提出了一种完全通过分析上下文统计信息的方法,根据中文语言的特点,在建立N—gram统计模型并分析比较的基础上,再通过计算TF／IDF的权重来获得最优的纠错结果,最后通过实验验证了该方法实现了搜索引擎中对输入关键词的自动检查和纠错。     

探析传输技术在信息通信工程中的应用

随着我国移动通信水平的提高,传输技术的高效性和安全性将成为技术发展中的核心.传输技术也是现代科技发展的标志,为企业和个人带来极大的利益,笔者将传输技术在信息通信工程中的具体应用进行了分析.