Fig. 8From: Fog computing application of cyber-physical models of IoT devices with symbolic approximation algorithmsPhotos of the three-blade fan in the three states: Normal state (left), Counter-wind state (center), and Mechanical failure state (right). The counter-wind state indicates the state where the counter-wind being blown by another fan in front of the fan. The mechanical failure refers to the state in which one of the blades having been removed offBack to article page