A new recognition algorithm using composite operator and direction curves to auto detect the dreg defects in X rays photo is proposed in this paper.
利用复合算子和方向曲线的方法建立了一种基于方向曲线的焊缝X光片中夹渣类缺陷的自动识别算法。
参考来源 - 一种基于方向曲线的目标检测方法 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
If the join key is a composite key, each key column must be prefixed with the PRIOR operator.
如果联接键是一个复合键，那么必须使用PRIOR运算符为每个键所在的列加上前缀。
The composite operation of fuzzy relation and operator constitute the fuzzy mapping.
模糊关系与算子合成构成了模糊映射，即将模糊集映射为模糊集。
Finally it is proved that P_-PBNDC is consistent with SBSPNI, and P_-PBNDC has composite property on the restriction and prefix operator but not on the parallel operator.
最后，证明了P - PBNDC和SBSPNI性质的一致性，在限制算子和前缀算子下的P - PBNDC具有复合性质，而在并行算子下不具有复合性质。
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