AE	Auto-Encoder
CNN	Convolutional Neural Networks
CNN-HS	CNN for HS division model
FC	Fully Connected
FEMTO	Fanche-Comte Electronics Mechanics Thermal science and Optics-sciences and technologies institute
FFT	Fourier Transform
FPT	First Predicting Time
HCP	Healthy Condition Period
HHT	Hilbert Huang Transformation
HI	Health Indicator
HS	Health Stage
IMS	the center of Intelligent Maintenance System
NSP	Nested-Scatter Plot
PCA	Principal Component Analysis
RMS	Root Mean Square
RUL	Remaining Useful Life
t-SNE	t-distributed Stochastic Neighbor Embedding
UCP	Unhealthy Condition Period