Because cyclic rules are quite sensitive to a little noise, this paper uses the noise ratio as the criterion of identifying cyclic itemsets for dealing with the problem and utilizes the cycle pruning technique to reduc.
由于数据噪声对发现周期性一般关联规则的巨大影响 ,文中用噪声比来抑制数据噪声对发现周期性一般关联规则的影响。
To increase signal-to-noise ratio(SNR) of medical ultrasound image,a frequency-modulated(FM) ultrasound transmitted imaging method is developed,where a weighted linear FM ultrasound is transmitted to enhance the emission energy without increasing the emission ultrasound pressure,and the image signal is formed by the demodulated ultrasound.
为了提高医学超声图像的信号噪声比,研究了调频超声发射的成像方法。