Network tomography is a new network question for discussion, which aims to obtain link-level performance characteristics, such as loss rate and average delay on each link, by end-to-end measurement.
网络透视是一新兴网络课题，旨在通过端到端的方法得到链联级的性能特性，比如：丢包率和平均延迟等。
The simulation results show that the algorithm based on expectation prediction value achieves higher prediction hit rate of cache and lower average waiting delay than the algorithm based on FIFO.
仿真实验结果表明，该算法与传统的FIFO算法相比较，提高了缓存的预测命中率，减少了用户平均等待延迟。
The comparison is in term of fiber required, average propagation delay, transmission loss, max bit rate, fault tolerance among four type topologies included bus, star, ring and dual ring.
针对双总线形、星形、环形和双环形四种光纤网络拓扑，比较它们的光纤需求长度、平均传播延迟、传输衰减、最大比特率及容错。
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