Tham khảo tài liệu 'sustainable energy harvesting technologies past present and future part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A Modelling Framework for Energy Harvesting Aware Wireless Sensor Networks 9 Input events of a node The computational unit in a node can react to events originating from the energy observations on the physical state . due to the harvesting device the sensor and the receiver. There are two energy related events where one is concerned with the change of the physical state while the other is concerned with reading the energy level in the node. The rationale for having two events rather than a combined one is that the change of the physical state is a cheap operation which does not involve a reading nor any other kind of computation whereas a reading of the energy level consumes some energy. A sensor recording results in an observation o belonging to a set Observation of observations. An observation could be temperature measurement a traffic observation or an observation of a bird - but the concrete kind is of no importance in this generic part of the framework. The events are described as follows readEnergyEvent e ps where e E Energy and ps E PhysicalState which is an event signalling a reading e of the energy level in the node and a resulting physical state ps which incorporates that the reading actually consumes some energy. physicalStateEvent ps where ps E PhysicalState is a new physical state. This event occurs when a change in the physical state is recorded. This change may for example be due to energy harvesting due to a drop in energy level or due to some other change which could be the elapse of time. observationEvent o ps where o E Observation is a recorded sensor observation and ps E PhysicalState is a physical state which incorporates the energy consumption due to the activation of the sensor. receiveEvent m ps where ps E PhysicalState and m E Message which could be an observation to be transmitted to the base station or a message describing the state of a neighbour node. Further details are given below. The receiver maintains a queue of messages. When .
