有效部位研究尚有许多问题需要探讨，如有效部位的提取、精制工艺及参数的优化，有效部位质量的全面控制等。
There are many issues should be discussed in the research of EF, such as extraction, purification technology and quality control.
从而为后续提取有效的病害诊断特征参数和建立模式识剐系统奠定了基础。
Thus the image pre-processing made foundation for following effective characteristic parameters for the disease diagnoses and for setting up mode recognition sys - tem.
为了利用所有的参考点数据来提取有效的模态参数，模态参数估计过程利用所谓的模态参与因子的加权项。
The modal parameter estimation process USES weighting terms, called modal participation factors, in order to utilize all of the referenced data to extract valid modal parameters.
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