基于专业平台的GIS系统二次开发与设计--以无线电测向交会定位系统为例

在GIS软件发展领域中，组件技术是GIS软件发展的新趋势，他不依赖于某一种开发语言，一般利用地理信息组件实现地理信息功能，而专业应用功能则直接在专业平台上开发或插入其他的专业分析控件来实现。该文结合无线电方面的知识，详细论述了基于专业平台(利用组件技术开发的)开发无线电测向、交会定位方面GIS系统的设计开发过程。     

Quantum broadcast communication with authentication

Two simple quantum broadcast communication schemes are proposed.A central party can broadcast his secret message to all the legitimate receivers simultaneously.Compared with the three schemes proposed recently (Wang et al.2007 Chin.Phys.16 1868),the proposed schemes have the advantages of consuming fewer quantum and classical resources,lessening the difficulty and intensity of necessary operations,and having higher efficiency.