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In , authors aim to decrease the expenses for the energy in smart homes by proposing an enhancement for the iHEM system, originally proposed in , by adding different priorities for home appliances and using different delays depending on the appliance type instead of using a fixed delay, and try to run the higher priority devices after shifting them to the mid or off- peak periods.
In this section, we will discuss the iHEM technique proposed in  in both cases: with feed-in and without feed-in, then we discuss the algorithms proposed in  that improved the iHEM by using different delays and priorities for each appliance.
In iHEM , the main idea is to shift the appliances events to the off-peak or mid-peak as much as possible.
In iHEM, the option of using feed-in is supported, where there is a battery storage at homes that can produce 350W per day.
iHEM with preemptive priority algorithm is shown in Algorithm 1 .
Algorithm 1: iHEM with Preemptive Priority Scheduling Technique  1: While (Timer < SimulationTime) 2: choose an event with the smallest timestamp from MainQueue 3: currEvent [left arrow] startSelectedEvent() 4: while(true) 5: if (Timer is equal) 6: break; 7: highPriorityEvent [left arrow] checkHigherPriorityEvent() 8: if (highPriorityEvent arrived while currEvent in running state) 9: then enqueue(highPriorityEvent) to PQ and startImmediately() 10: enqueue(currEvent) to WQ and start after highPriorityEvent finished 11: end if 12: end if 13: end while C.
This algorithm works exactly like the iHEM except that each appliance has its own maximum delay instead of the global maximum allowable delay in iHEM (12 hours).
This scheme is a modified version of the iHEM with preemptive priority and different delays scheme.
Figure 1 represent the relation between the time for running the simulation in days and the total cost of the energy consumption in dollars for four devices (Dryer, washer, dishwasher, and coffeemaker) using three test scenarios; iHEM with feed-in, iHEM with feed-in and priority, and iHEM with feed-in priority and delay.
Living cultures of the case strain are deposited in the Centraalbureau voor Schimmelcultures, the Netherlands (CBS 109356) and in the Institute of Hygiene and Epidemiology, Belgium (IHEM 18438).
Burgos, Mario, IHEM Medical School, Mendoza, Argentina
Burgos, Mario H., IHEM Medical School, UNC Conicet, Casilla de Correo 56, 5500 Mendoza, Argentina
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