title: Wearable Fall Detector using Integrated Sensors and Energy Devices.
abstract: Wearable devices have attracted great attentions as next-generation electronic devices. For the comfortable, portable, and easy-to-use system platform in wearable electronics, a key requirement is to replace conventional bulky and rigid energy devices into thin and deformable ones accompanying the capability of long-term energy supply. Here, we demonstrate a wearable fall detection system composed of a wristband-type deformable triboelectric generator and lithium ion battery in conjunction with integrated sensors, controllers, and wireless units. A stretchable conductive nylon is used as electrodes of the triboelectric generator and the interconnection between battery cells. Ethoxylated polyethylenimine, coated on the surface of the conductive nylon electrode, tunes the work function of a triboelectric generator and maximizes its performance. The electrical energy harvested from the triboelectric generator through human body motions continuously recharges the stretchable battery and prolongs hours of its use. The integrated energy supply system runs the 3-axis accelerometer and related electronics that record human body motions and send the data wirelessly. Upon the unexpected fall occurring, a custom-made software discriminates the fall signal and an emergency alert is immediately sent to an external mobile device. This wearable fall detection system would provide new opportunities in the mobile electronics and wearable healthcare.
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.|School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Sungmook
authors.initials: S
authors.lastname: Jung
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.|School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Seungki
authors.initials: S
authors.lastname: Hong
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.|School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Jaemin
authors.initials: J
authors.lastname: Kim
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.
authors.forename: Sangkyu
authors.initials: S
authors.lastname: Lee
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.|School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
authors.affiliation: Department of Physics, Inha University, Incheon, 402-751, Republic of Korea.
authors.forename: Minbaek
authors.initials: M
authors.lastname: Lee
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 151-742, Republic of Korea.|School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 151-742, Republic of Korea.
authors.forename: Dae-Hyeong
authors.initials: DH
authors.lastname: Kim
mesh_terms: D000058:Accidental Falls; D003020:Clothing; D011211:Electric Power Supplies; D004867:Equipment Design; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009068:Movement; D012984:Software; D059015:Wireless Technology