由于电气化铁道牵引负载受线路条件等多种因素影响而波动剧烈，因此产生的谐波也具有随机波动性。
Traction load varies rapidly for multi-factors such as rail condition, so traction load harmonic also has random time-varying characteristic.
通过对光网络时间不均衡性的研究发现，低负载情况下光网络的资源利用率存在较强波动性。
The dissertation analyzes the uneven time distribution characteristic of optical network and finds that the instantaneous network utilization is very bursty under light loading.
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