validity problem meaning in English

永真问题

A study of the validity problems in the achievement test of the comprehensive english course
浅谈综合英语成绩测试中的效度及存在问题
The validity problem of active multi - decoy to ground base radar system is studied
摘要研究了有源多假目标等欺骗性电子干扰对地基防御雷达系统的有效性问题。
Based on fuzzy clustering algorithm , we studied the objective function of the traditional fuzzy c - means algorithm and proposed a modified objective function for fcm ; we discussed clustering validity problem , and a texture segmentation method based on adaptive fcm has been constructed by the guidance of fuzzy clustering validity
在介绍聚类算法的基础上，研究了模糊c -均值聚类算法目标函数的改进问题，提出了基于修正目标函数的fcm算法；讨论了聚类有效性问题，在模糊聚类有效性函数指导下构造了一种自适应模糊c -均值聚类算法的纹理分割方法。