One class of methods synthesizes these systems by minimizing a linear fractional transformation in the H-infinity norm. The behavior at different gain parameters of a function that describes the effect of these systems can be visualized using a root-locus (15[1]-5[1])plot in one technique for (15[1])analyzing these systems’ stability. Transfer functions of these mechanisms (15[1])can be tuned by the use of three correcting terms known as the (*) proportional, integral, and derivative, (10[3])or PID. Closed examples of these mechanisms (10[1])use a set point to adjust a process variable, such as in a thermostat (10[1])that attempts to reach a reference temperature. For 10 points, name these feedback or feedforward mechanisms that underlie dynamical control systems. ■END■