Feature 1

\(Feat1\left( {t_{i}} \right) =  1 + \frac{1}{{\left( {AFR\left( {t_{i} } \right)  1.5} \right)^{2} }}\)

\(Feat1\left( {t_{i}} \right) = \frac{{AFR\left( {t_{i} } \right)  AFR\left( {t_{min} } \right)}}{{t_{min}  t_{i} }}\)

Feature 2

\(\left\{ {\begin{array}{*{20}c} {1, \wedge Feat1\left( {t_{i} } \right) \ge T_{u1}} \\ {0, \wedge Feat1\left( {t_{i} } \right) < T_{u1}} \\ \end{array} } \right.\)

\(\left\{ {\begin{array}{*{20}c} {1, \wedge Feat1\left( {t_{i} } \right) \ge T_{u1}} \\ {0, \wedge Feat1\left( {t_{i} } \right) < T_{u1}} \\ \end{array} } \right.\)

Feature 3

\(\left\{ {\begin{array}{*{20}c} {1, \wedge Feat1\left( {t_{i} } \right) \le T_{l1}} \\ {0, \wedge Feat1\left( {t_{i} } \right) > T_{l1}} \\ \end{array} } \right.\)

\(\left\{ {\begin{array}{*{20}c} {1, \wedge Feat1\left( {t_{i} } \right) \le T_{l1}} \\ {0, \wedge Feat1\left( {t_{i} } \right) > T_{l1}} \\ \end{array} } \right.\)
