In order to verify the validity for signal phase matching principle, the experiments of DOA (Direction of Arrival) estimation are carried out at reservoir by using 16-sensor array.
为了验证信号相位匹配原理的正确性，利用自制的16元线列阵，在水库进行了声源定向实验研究。
The validity check of zero-sequence operating direction for transformer directional over-current protection is also essential.
另外还需要进行变压器零序方向过电流保护动作方向正确性的检查。
Using teacher images and machine learning method, an image direction classification model is built as a decision tree. Test results argued the validity of this method.
实验结果表明，系统所使用的轮廓线向量图像特征也能够较有效地应用于图像方向分类，而机器学习则能够有效地为之建立决策树分类模型。
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