一、概述在过去几年里，欧洲各国的国家科研网络（NRNS）先后建立f与各大学和科研机构的高速计算机互联网。高速互联向的建立，为科研工作者在网上应用实时多媒体技术提供了可能。但是，与之相比，能够进行这类新兴服务项目的国际科研网络基础设施的开发却相对滞后，明显制约了 I. OVERVIEW Over the past few years, the National Research Networks (NRNS) of European countries have successively established high-speed computer networks with universities and research institutes. The establishment of high-speed Internet has provided the possibility for researchers to apply real-time multimedia technology online. However, in contrast, the development of an international network of research infrastructure capable of undertaking such emerging services is relatively lagging and obviously constrained