A method and system for determining the mechanism of cardiac arrhythmia in a patient is disclosed. A group III nitride compound semiconductor 3 grows epitaxially on the buffer layer 2 in a longitudinal direction, and grows epitaxially on the substrate-exposed portions in a lateral direction. The object is created and separated from a host substrate. The dispenser actuator means is connected to the outlet port and is biased to a closed position, but may be moved to an open position by a vessel for holding a hot beverage. Indications of the occurrence of specified events are then passed to a discrete event system model.