11. Consider the standard feedback control structure with: e- Gy(s) = s +1 TIS (a) Determine the controller settings using the Ziegler-Nichols and Cohen-Coon meth- ods. Gel(B) = K.(1+ (1+7) 1 (b) Using the controller settings that you found in a), plot the response of the closed- loop system to a unit step change in the set-point. Which one of the two methods results in better response characteristics