IEEE Spectrum November 4, 2019 A team of researchers in South Korea is exploring whether the unique bioacoustic signatures created as sound waves pass through humans can be used to identify individuals. They developed a bioacoustic frequency spectroscopy system and applied it to the fingers to obtain information on the anatomy, biomechanics, and biomaterial properties of the tissues. The modulated microvibrations propagated through our body could capture a unique spectral trait of a person and the biomechanical transfer characteristics persisted for two months and resulted in 97.16% accuracy of identity authentication in 41 subjects. In the current version it does […]
Tag Archives: S&T South Korea
Artificial intelligence (AI) designs metamaterials used in the invisibility cloak
EurelAlert July 14, 2019 Researchers in South Korea developed an AI system and taught it to design arbitrary photonic structures and gave additional level of freedom of the design by categorizing types of materials and adding them as a design factor, which made it possible to design appropriate materials for relevant optical properties. Previous studies required inputs of materials and structural parameters beforehand and adjusting photonic structures afterwards. The current process significantly reduced the time needed to design photonic structures…read more. Open Access TECHNICAL ARTICLE
A wearable vibration sensor for accurate voice recognition
Phys.org June 24, 2019 Conventional vibration sensors recognize a voice through air vibration and the sensitivity decreases due to mechanical resonance and the damping effect, therefore they are not capable of measuring voices quantitatively. Researchers in South Korea developed a device which consists of an ultrathin polymer film and a diaphragm with tiny holes that can sense voices quantitively by measuring the acceleration of skin vibration. They demonstrated that the voice pressure is proportional to the acceleration of neck skin vibration at various sound pressure levels from 40 to 70 dBSPL. This research can be further extended to various voice-recognition […]
Detecting the shape of laser pulses
Science Daily May 17, 2018 The existing method to study the shape of laser pulses relies on the generation of attosecond X-ray pulses which requires detection equipment in vacuum chambers. Researchers in South Korea demonstrate that an arbitrary time-dependent laser field can be directly sampled using subcycle tunneling ionization in a gaseous medium or in air. This unique approach enables the complete temporal characterization of the laser field, including its carrier-envelope phase, for a broad spectral range in ambient air, providing a universal tool for the precise measurement of the laser field… read more. Open Access TECHNICAL ARTICLE