Browsing by Author "Rodrigues, Tiago André Gaspar Nunes"
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- Multi-objective meta-heuristic sleep scheduling in low-power devicesPublication . Rodrigues, Tiago André Gaspar Nunes; Santo, António Eduardo Vitória do EspiritoEnergy Harvesting techniques and Wireless Sensor Networks evidence an optimal symbiosis, given that the typical environment where the motes are placed are most times remote, hard to reach, and with poor operational capabilities, this makes the possibility of changing batteries or another piece of hardware arduous and laborious, requiring great resource exhaustion. With the appliance of EH modules and optimization algorithms, it is possible to reach an Energy Neutral Operation condition, which turns these motes into self-autonomous devices capable of operating for years without disruption and human intervention. Meta-heuristic algorithms are applied in these scenarios, where a global optimum solution is required for the mote to operate under a rigorous and efficient energy expenditure scheme, turning these systems into complete black-boxes, inputting the maximum possible physics variables, and outputting the ideal mode of operation, commuting, for example, duty cycle, voltage and frequency variation or even devising methodologies that decompose one extensive task into multiple, easier to process, divided tasks. In this dissertation, a sleep scheduling algorithm, based on MHs, is studied, devised, and demonstrated. As well as a system being architected based on an LPC1768 microcontroller in order to simulate a mote of a WSN, an extensive revision of the state-of-art techniques, used in EH-WSNs is also carried out.