为研究城市机动车污染特征，实现污染物排放的最优控制，提出研究排放控制目标的数学优化模型。
For studying characteristics of urban vehicular pollution so as to suggest the optimal control target for policy making, a mathematical optimizing model was developed.
大规模定制物流管理要求更高的质量、最优化成本与快速反应时间，在新的环境下具有了链的特征。
It demands for higher quality, optimized cost and faster reaction time, has the chain characteristic under the new environment.
由于在小波降噪中不同的阈值适应的信号特征不同，采用多种小波阈值对城市轨道交通牵引供电系统谐波信号进行降噪，并从中选择了最优的降噪阈值，达到对信号的优化处理。
Due to different wavelet threshold fit for different characteristic of signal, various wavelet de-noise threshold was used to decline the harmonics of signal and the best threshold was chosen.
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