Abstract: An apparatus configured to estimate biometric information includes a sensor configured to measure a light signal reflected from a subject and a temperature of the subject, and a processor configured to perform temperature correction on the light signal reflected from the subject based on the temperature of the subject using a light signal-temperature relationship between the light signal reflected from the subject and the temperature of the subject to thereby obtain a temperature-corrected light signal, and estimate the biometric information of the subject based on the temperature-corrected light signal.

Abstract: A wearable device includes a body unit to be worn on a subject; a light source comprising a plurality of light emitting diodes and configured to emit light to the subject; a sensor comprising a plurality of photodiodes configured to generate electrical signals based on the light returning from the subject, the plurality of photodiodes being divided into a first photodiode (PD) group and a second PD group, and the photodiodes of the first PD group being disposed to face the photodiodes of the second PD group on the body unit; and a controller configured to extract biometric information of the subject based on the electrical signals generated by the plurality of photodiodes.

Abstract: An apparatus and method for biometric information detection are provided. The apparatus includes a housing, a biometric sensor disposed on a surface of the housing, and configured to detect biometric information of a subject, and an impedance measurer including biometric electrode pairs disposed around the biometric sensor, the impedance measurer being configured to measure bio-impedances of the subject using the biometric electrode pairs. The apparatus further includes a processor configured to determine a bio-impedance ratio, based on the measured bio-impedances, and determine validity of the detected biometric information, based on the determined bio-impedance ratio.

Abstract: An apparatus and method for matching impedance of an antenna by using Standing Wave Ratio (SWR) information is provided. While the impedance of the impedance matching unit is controlled, a region of a Smith chart in which initial total impedance of the impedance matching unit and the antenna is located by using an SWR calculated by an SWR operation unit, and the impedance of the impedance matching unit is controlled according to the determined region, thus correctly matching the impedance of the antenna.

Abstract: A method and apparatus for data communication in wireless power transmission are provided. A wireless power transmitter includes a resonance antenna configured to wirelessly transmit a power to a wireless power receiver, and receive a signal from the wireless power receiver, the signal including a sub-carrier. The wireless power transmitter further includes a controller configured to receive the signal from the resonance antenna, and receive data from the wireless power receiver based on the sub-carrier.

Abstract: A method and apparatus for data communication in wireless power transmission are provided. A wireless power transmitter includes a resonance antenna configured to wirelessly transmit a power to a wireless power receiver, and receive a signal from the wireless power receiver, the signal including a sub-carrier. The wireless power transmitter further includes a controller configured to receive the signal from the resonance antenna, and receive data from the wireless power receiver based on the sub-carrier.

Abstract: An electromagnetic bandgap (EBG) pattern structure includes a nonconductive substrate and a pattern assembly formed on the substrate. The EBG pattern structure also includes regularly arranged closed-loop patterns and open-loop patterns, both of which are made of a conductive material. The EBG pattern structure can be used to manufacture new security products by applying its frequency characteristics to securities or IDs and variously used in security technologies for preventing forgery and alteration because various security codes can be created by adjusting the variables of its EBG pattern.

Abstract: In an apparatus for recognizing a security code having an electromagnetic band gap (EBG) pattern which uses reflection and transmission characteristics of the EBG pattern, a voltage controlled oscillator generates a signal to a power divider, which divides the power of the signal into halves, and outputs a first signal through a waveguide to be incident on the EBG pattern. The waveguide receives a signal reflected from the EBG pattern and outputs the reflected signal to a phase detector. A circulator outputs the second signal to the phase detector, which detects the phase difference between the reflected signal and the second signal, and outputs phase difference data to a data control unit, which determines whether the security code having the EBG pattern is recognized using the phase difference data. In an alternate embodiment, the voltage control oscillator is controlled to sequentially generate signals using power difference data.

Abstract: In an apparatus for recognizing a security code having an electromagnetic band gap (EBG) pattern which uses reflection and transmission characteristics of the EBG pattern, a voltage controlled oscillator generates a signal to a power divider, which divides the power of the signal into halves, and outputs a first signal through a waveguide to be incident on the EBG pattern. The waveguide receives a signal reflected from the EBG pattern and outputs the reflected signal to a phase detector. A circulator outputs the second signal to the phase detector, which detects the phase difference between the reflected signal and the second signal, and outputs phase difference data to a data control unit, which determines whether the security code having the EBG pattern is recognized using the phase difference data. In an alternate embodiment, the voltage control oscillator is controlled to sequentially generate signals using power difference data.

Abstract: Disclosed herein is an electromagnetic bandgap (EBG) pattern structure, including: a nonconductive substrate; and a pattern assembly formed on the substrate and including regularly arranged closed-loop patterns and open-loop patterns both of which are made of a conductive material. The EBG pattern structure is advantageous in that it can be used to manufacture new security products by applying its frequency characteristics to securities or IDs and in that it can be variously used in security technologies for preventing forgery and alteration because various security codes can be created by adjusting the variables of its EBG pattern.