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. 2021 Oct 13;7(42):eabj0694. doi: 10.1126/sciadv.abj0694

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Fig. 6. — (A to D) Wireless power transmission system using the mountain-shaped 3DE. (A) Schematic illustration and photograph of the wireless power system. (B) Intensity change of the LEDs. The intensity of the LEDs gradually increased with increase in induced current. (C and D) Negligible change in the light intensity of the LEDs while poking with a sharp object (C) or pressing with a transparent rigid film (D). (E and F) Heel-shaped wireless battery-free pressure sensor for bedsore monitoring system with NFC. (E) Schematic illustration and photographs of the heel-shaped pressure sensor. (F) Pressure sensor signal from the NFC reader during various dynamic foot motions. The pressure signal was measured well from NFC reader and alternated between the maximum pressure at posture I and the minimum pressure at posture II as the angle of the foot changed. Photo credit: Jungrak Choi, KAIST.