在低频分量部分，基于HVS视觉模型，将水印信号逐点变化地嵌入到原始图像中；
In low frequency sub band, the watermarking is embedded into host by the way of pixel-to-pixel embedding according to HVS model.
进行系统低频减载方案设计时，简单的频率响应模型由于未考虑系统电压对频率过程的影响而导致不少情况下无法适用。
During the design of under frequency load shedding (UFLS) schemes, some simple models for frequency dynamics analysis are obviously inadequate since they do not take system voltage into account.
文中详细介绍了如何建立用于求解小尺度封闭空间低频声传递函数的三维有限元素模型。
This paper introduces how to establish Three-dimension finite element model to solute low frequency sound transfer function in small-enclosed room.
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