A three part foundation system for supporting a building is described. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current power source. The commands may be received from a device abstraction layer in response to a request from the simulator for any commands associated with the plurality of devices. In addition, the method may include binding the tag to the message by applying a message authentication scheme and providing a mechanism for down-stream applications to identify information about data included in the message by reference to the tag. A series of historical scenarios of the demand at the departure of previous instances of the flight are obtained from the potential profiles, and a stochastic model is applied to the historical scenarios according to the corresponding probabilities for calculating the optimised weight and volume authorizations for each category.