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Diagram of the subject wearing the sensor: (a) the actual diagram of the subject wearing the sleeping-position monitoring device; (b) the schematic diagram of the subject wearing the sensor. When the subject’s sleeping position changes, the four flexible angle sensors bend; thus, the output voltage signal fluctuates as the sleeping position changes. The six-axis motion sensor in the waist pack changes the x-axis acceleration and angular velocity in response to the turning movement.
