Identify the following environments as either hard or soft real-time.
a.Thermostat in a household.
b.Control system for a nuclear power plant.
c.Fuel economy system in an automobile.
d.Landing system in a jet airliner.
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Answer:Hard real-time scheduling constraints are required for the nuclear power plant and for the jet airliner.In both settings,a delayed
reaction could have disastrous consequences and therefore the sched-uler would need to satisfy real-time scheduling requirements.On the
other hand,the thermostat and the fuel economy system can be oper-ated within the context of a scheduler that provides only soft real-time
constraints.Delayed triggering of these devices would only result in suboptimal use of resources or a slight increase in discomfort.