Wireless sensor networks 47 Detectors. Sensors. Sensor networks 37 Sensor networks 23 Sensor nodes 17 Wireless sensor network 15 Internet of things 14 Energy efficiency 12 wireless sensor networks 12 Energy utilization 9 Internet of Things 9 Performance 8 wireless sensor network 8 Low power electronics 7 Sensors network 7 Costs 6 Low-costs 6 Routing protocols 6 Timing circuits 6 Antennas 5 Artificial intelligence 5 Energy harvesting 5 Internet protocols 5 Localisation 5 Network architecture 5 Network lifetime 5 Network security 5 Power management (telecommunication) 5 Wearable sensors 5 Wi-Fi 5 wireless sensor network (WSN) 5