For the following systems concepts, fill in the cells of Table 1.2 with descriptors for possible events. Estimate event periods for the periodic events.

(a) Elevator group dispatcher: this subsystem makes optimal hall - call allocation for a bank of high - speed elevators that service a 40 - story building in a lively city like Louisville.

(b) Automotive control: this on - board crash avoidance system uses data from a variety of sensors and makes decisions and affects behavior to avoid collision, or protect the occupants in the event of an imminent collision. The system might need to take control of the automobile from the driver temporarily.

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Periodic Synchronous Cyclic code TABLE 1.2. Taxonomy of Events and Some Typical Examples Aperiodic Sporadic Divide-by-zero Conditional branch Asynchronous Clock interrupt Regular, but not (trap) interrupt Power-loss alarm fixed-period interrupt