本文提供了一种用于识别这类随机信号的数学统计模型，并介绍了一种时间平均法用来获取超声背散射信号的衰减系数。
In this paper, a mathematical model is used to characterize this random signals, and a time averaging method is used for obtaining the ultrasonic attenuation coefficient.
不过，他应付有方，已经研究出一套数学模型来解释第二位数的分布，将统计上的疑异置于更充裕的分析基础上。
However, he has managed to develop a mathematical model that explains the distribution of the second digits, putting what might appear to be a statistical oddity on a more solid footing.
运筹分析师建立有用的数学与统计模型，协助解决各项问题的决策。
The operations research analyst develops and uses mathematical and statistical models to help solve these decision problems.
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