| RUL | remaining useful life |
| MLE | maximization likelihood estimation |
| EM | expectation maximization |
| PF | particle filtering |
| FPT | first passage time |
| probability density function | |
| CDF | cumulative density function |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.