Along with the rapid development of network technologies, heterogeneous resources from independent locations can be integrated to a loose-coupling computing environment, that is, Distributed Computing Environment ( DCE ). 随着网络计算技术的迅速发展,分布在不同地点的异构资源可以通过网络互联成一个松散耦合的计算环境,也就是分布式计算环境。
NGN ( next generation network ) will be a uniform and integrated network which imports distributed computing and communication technology. NGN have multiple kinds of applications and network environment. 下一代网络将是一个统一、综合的网络,综合了分布式计算和通信技术,且应用种类较多,网络环境复杂。