Problem $1\mathrm{.}1($Open$-$loop vs Closed loop$)$ Describe differences between open$-$loop and closedloop control. You might explain the differences of open$-$loop and closed$-$loop control in a certain example, but use an example other than a cruise control example presented in the lecture note. Note that there are four main objectives or goals of closed$-$loop control systems. The differences should be emphasized in those four perspectives.