For the electrocardiogram waveform, based on the hierarchical structure, this paper presents a characteristic sample and description method.
针对心电波形，本文提出了一种基于层次结构的特征抽取和描述方法。
2
Optical fibre grating utilize photosensitive characteristic to form the space phase grating in the core, it can change the transmission route of the light wave in the light-transmitting fibre.
光纤光栅是利用光纤材料的光敏性，在纤芯内形成空间相位光栅，它可以改变光波在光导纤维中的传输路径。
3
Next, the effects of the electrical pressure of the current impulses, of their wave-form and other characteristic features, were investigated.