SHM	Structural Health Monitoring
UGW	Ultrasonic Guided Waves
OGW	Open Guided Waves
ML	Machine Learning
AE	Acoustic Emission
DL	Deep Learning
NN	Neural Network
RNN	Recurrent Neural Network
CNN	Convolution Neural Network
ToF	Time of Flight
RMSD	Root Mean Squared Deviation
ReLU	Rectified Linear Unit
BCE	Binary Cross-Entropy
MAE	Mean Absolute Error
AdaGrad	Adaptive Gradient Algorithm
RMSProp	Root Mean Square Propagation
PZT	Lead Zirconate Titanate
BWF	Butterworth Filter
TP	Transducer Pair
CP	Coordinate Point