摘要：通信系统在分布式应用系统中占有重要的地位,文章介绍了一种基于Java的进程间异步通信系统的设计思想、系统结构和实现。

摘要：广域网路由器异步通信系统是路由器中的一个重要的组成部分，它是家庭计算机用户访问Ｉｎｔｅｒｎｅｔ的主要途径之一．从硬件和软件两个方面，详细介绍了广域网路由器异步通信系统的设计和实现．

摘要：It is still a laborious work to consult massive multidisciplinary geological maps which are scattered in different geological departments,and hard to give full play to the potential application value of geological map. Along with the network,the development of communication and computer technology,especially with the Web2.0 technology arisen,provides opportunities to the web for sharing of geological maps. Web fast sharing platform of massive geological maps( WSPGM) is based on the Flex technology development,using B/S architecture,with map navigation,search,display,security and other functions of the software system. Through the map pretreatment and asynchronous communication the system can display any size of geological map,and through the range limits,rights management,sharing system and watermark logo to take effective security on geological map. On the basis of this system,with the Jilin University web sharing system of geological map,the system can greatly improve the efficiency of using geological map. for research.