Global distribution of maternal causes of. death. A maternal death is defined as the death of a. woman while pregnant or within 42 days of. termination of pregnancy, regardless of the. site or duration of pregnancy, from any cause. related to or aggravated by the pregnancy or. its management.
There are two types of control systems namely: 1  Open loop control systems (non-feedback control systems) 2  Closed loop control systems (feedback control systems)
Fundamentally, there are two types of control loops: open loop control and closed loop (feedback) control. Control theory is concerned only with closed loop control. In open loop control, the control action from the controller is independent of the process output (or controlled process variable - PV).