Monitoring systems 122 Global system for mobile communications 26 Monitoring 26 Monitoring system 23 Database design 22 Microcontrollers 22 Programmable controllers 22 Computer networks 20 Global Positioning System 20 Design and construction 16 Heart rate monitoring 16 Sensor networks 16 Arduino (Programmable controller) 12 Automatic tracking 12 Building 8 Child care 8 Electronic surveillance 8 Home automation 8 Child 6 Control systems 6 Internet of things 6 Mobile communication systems 6 Security measures 6 Wireless communication systems 6 Access control 4 Air quality management 4 Android (Electronic resource) 4 Automatic control 4 Buses 4 Data processing 4