Lecture 6) 2차 앞선 요소

$$G(s) = (\frac{s}{\omega_n})^2 + (2\zeta\frac{s}{\omega_n}) + 1$$

$$\begin{align} G(j \omega) &= (\frac{j \omega}{\omega_n})^2 + (2\zeta\frac{j \omega}{\omega_n}) + 1 \\ &= 1 - (\frac{\omega}{\omega_n})^2 + j(2\zeta\frac{\omega}{\omega_n}) \end{align}$$