Abstract: An image processing-based foreign substance detection method in a wireless charging system and a device performing the method are disclosed. A method for detecting a foreign substance includes an operation of acquiring an image of a charging area of a wireless charging system, an operation of detecting, based on an RGB value of a frame of the image, a foreign substance in the charging area, an operation of discriminating a type of the foreign substance, and an operation of performing power control of the wireless charging system according to the type of the foreign substance.

Abstract: A method for calculating an altitude of a target through an apparatus for calculating an altitude of the target, which comprises a plurality of MIMO radar virtual antennas, may comprise: receiving electromagnetic waves reflected from the target through a pair of virtual antennas classified into an upper antenna and a lower antenna and alternately arranged in two columns linearly; obtaining range information and phase information of the target from the pair of virtual antennas by analyzing the electromagnetic waves; and calculating altitude information of the target from position information of the pair of virtual antennas, and the range information and the phase information.

Abstract: Disclosed are a radar image generation method and an apparatus for performing the same. The radar image generation method includes receiving a received signal received at each of radars that are distributed and arranged; generating an input signal by processing the received signal; generating a support vector based on the input signal; updating the support vector; updating a coefficient corresponding to the support vector; and generating a radar image based on the support vector and the coefficient.

Abstract: The present invention relates to a polymer carbon nitride, a specific crystal form of the polymer carbon nitride, and a cosmetic composition, an ultraviolet ray-blocking composition, and an external use skin preparation composition, which include the polymer carbon nitride. The polymer carbon nitride according to one aspect of the present invention and a crystal form produced by a specific preparation example thereof can absorb both UVA and UVB, and thus can effectively protect the skin from ultraviolet rays while also being non-toxic and thus suitable for living bodies and lacking photoactivity. Therefore, the polymer carbon nitride and the crystal form can be utilized in a cosmetic composition, an ultraviolet ray-blocking composition and an external use skin preparation composition, which are applied to the living body.

Abstract: An antenna device for magnetic field communication may include: a first coil; a second coil; a third coil; a first capacitor connected to a 1-1 terminal of the first coil; a second capacitor connected to a 2-1 terminal of the second coil; a third capacitor connected to a 3-1 terminal of the third coil; and an input port including a first input terminal connected to a 1-2 terminal of the first coil, a 2-2 terminal of the second coil, and a 3-2 terminal of the third coil, and a second input terminal connected to the first capacitor, the second capacitor, and the third capacitor.

Abstract: A method of transmitting and receiving an orthogonal frequency division multiplexing (OFDM) signal for radio detection and ranging (radar) applications, and apparatuses performing the method are disclosed. The method includes receiving an OFDM signal in which a cyclic prefix (CP) is not included and converting the received OFDM signal to a received discrete time-domain signal through an analog-to-digital converter (ADC), selecting sub-carrier symbols to be input to a fast Fourier transform (FFT) from among all sub-carrier symbols included in the received discrete time-domain signal by performing windowing on the received discrete time-domain signal by a window that is based on an estimated value of a maximum delay that occurs potentially in a channel, converting the received discrete time-domain signal to a received frequency-domain signal by inputting the selected sub-carrier symbols to the FFT, and performing channel estimation based on the received frequency-domain signal.

Abstract: A wireless power transmitting device includes: an upper coil including a first tubular spiral coil and a first planar spiral coil disposed beneath the first tubular spiral coil; a lower coil including a second planar spiral coil disposed to face the first planar spiral coil and a second tubular spiral coil disposed beneath the second planar spiral coil; a connecting stub configured to connect the upper coil and the lower coil to each other; and a power source configured to supply a power to the upper coil or the lower coil. The first planar spiral coil and the second planar spiral coil generate an electric field and a magnetic field in a resonance state to transfer at least some of the power from the power source to an external wireless power receiving device through the electric field and the magnetic field.

Abstract: An array antenna capable of steering a beam in a first communication node of a wireless communication system may comprise: a plurality of single antennas each capable of variably adjusting a beam steering direction; a plurality of beamforming control units each of which is connected to each of the plurality of single antennas to control a beamforming operation of each of the plurality of single antennas; and an array antenna control unit connected to the plurality of beamforming control units to control a beamforming operation of the entire array antenna, wherein the plurality of single antennas are arranged in a cylindrical shape and are installed to face a direction opposite to a central direction of the cylinder shape, and the array antenna is configured to steer a beam to a predetermined area around the first communication node through at least one single antenna among the plurality of single antennas.

Abstract: An image processing-based foreign substance detection method in a wireless charging system and a device performing the method are disclosed. A method for detecting a foreign substance according to an example embodiment includes an operation of acquiring an image of a charging area of a wireless charging system, an operation of detecting, based on an RGB value of a frame of the image, a foreign substance in the charging area, an operation of discriminating a type of the foreign substance, and an operation of performing power control of the wireless charging system according to the type of the foreign substance.

Abstract: An operation method performed by an apparatus for detecting multiple targets may comprise transmitting first signals using Mt transmit antennas included in the apparatus; receiving the first signals reflected by the multiple targets through Mr receive antennas included in the apparatus; generating a first function for estimating a velocity and an azimuth of each of the multiple targets using the first signals and the reflected first signals; estimating a velocity and an azimuth that maximize a result of the first function as a velocity and an azimuth of a first target closest to the apparatus among the multiple targets; generating a second function by cancelling interference caused by the first target from the first function; and estimating a velocity and an azimuth that maximize a result of the second function as a velocity and an azimuth of a second target among the multiple targets.

Abstract: A method and system for manufacturing a coil for wireless charging are disclosed herein. The method may include manufacturing a printed circuit board, generating a coil-shaped metal pattern on the printed circuit board, and generating an additional metal pattern on the top of the metal pattern using a 3D metal printer.

Abstract: An antenna device for magnetic field communication may include: a first coil; a second coil; a third coil; a first capacitor connected to a 1-1 terminal of the first coil; a second capacitor connected to a 2-1 terminal of the second coil; a third capacitor connected to a 3-1 terminal of the third coil; and an input port including a first input terminal connected to a 1-2 terminal of the first coil, a 2-2 terminal of the second coil, and a 3-2 terminal of the third coil, and a second input terminal connected to the first capacitor, the second capacitor, and the third capacitor.

Abstract: An array antenna capable of steering a beam in a first communication node of a wireless communication system may comprise: a plurality of single antennas each capable of variably adjusting a beam steering direction; a plurality of beamforming control units each of which is connected to each of the plurality of single antennas to control a beamforming operation of each of the plurality of single antennas; and an array antenna control unit connected to the plurality of beamforming control units to control a beamforming operation of the entire array antenna, wherein the plurality of single antennas are arranged in a cylindrical shape and are installed to face a direction opposite to a central direction of the cylinder shape, and the array antenna is configured to steer a beam to a predetermined area around the first communication node through at least one single antenna among the plurality of single antennas.

Abstract: The present disclosure relates to an ultraviolet absorber, a preparation method therefor, and an ultraviolet screening product containing same and, more specifically, to: an ultraviolet absorber, which comprises polymeric carbon nitrides having a heterocyclic structure comprising C and N; a preparation method therefor; and an ultraviolet screening product containing same.

Abstract: A method for calculating an altitude of a target through an apparatus for calculating an altitude of the target, which comprises a plurality of MIMO radar virtual antennas, may comprise: receiving electromagnetic waves reflected from the target through a pair of virtual antennas classified into an upper antenna and a lower antenna and alternately arranged in two columns linearly; obtaining range information and phase information of the target from the pair of virtual antennas by analyzing the electromagnetic waves; and calculating altitude information of the target from position information of the pair of virtual antennas, and the range information and the phase information.

Abstract: A wireless power transmitting device includes: an upper coil including a first conical coil and a first spiral coil disposed beneath the first conical coil; a lower coil including a second spiral coil disposed to face the first spiral coil and a second conical coil disposed beneath the second spiral coil; a connecting stub configured to connect the upper coil and the lower coil to each other; and a power source configured to supply a power to the upper coil or the lower coil. The first spiral coil and the second spiral coil generate an electric field and a magnetic field in a resonance state to transfer at least some of the power from the power source to an external wireless power receiving device through the electric field and the magnetic field.

Abstract: Disclosed are a method of radiating wave energy available for unmanned automatic operation and apparatuses for performing the same. The method includes obtaining a dielectric characteristic of a object by performing a reconstruction calculation based on a scattered signal that is scattered from the object and pre-measured information on the object, determining a wave radiation parameter for adjusting energy of a wave to be radiated to a lesion of the object by performing a characteristic analysis operation based on the dielectric characteristic, and determining the energy of the wave to be high-power energy based on the wave radiation parameter.

Abstract: Disclosed are a radar image generation method and an apparatus for performing the same. The radar image generation method includes receiving a received signal received at each of radars that are distributed and arranged; generating an input signal by processing the received signal; generating a support vector based on the input signal; updating the support vector; updating a coefficient corresponding to the support vector; and generating a radar image based on the support vector and the coefficient.

Abstract: A method of transmitting and receiving an orthogonal frequency division multiplexing (OFDM) signal for radio detection and ranging (radar) applications, and apparatuses performing the method are disclosed. The method includes receiving an OFDM signal in which a cyclic prefix (CP) is not included and converting the received OFDM signal to a received discrete time-domain signal through an analog-to-digital converter (ADC), selecting sub-carrier symbols to be input to a fast Fourier transform (FFT) from among all sub-carrier symbols included in the received discrete time-domain signal by performing windowing on the received discrete time-domain signal by a window that is based on an estimated value of a maximum delay that occurs potentially in a channel, converting the received discrete time-domain signal to a received frequency-domain signal by inputting the selected sub-carrier symbols to the FFT, and performing channel estimation based on the received frequency-domain signal.

Abstract: Disclosed are a communication method and communication apparatus using an ambient backscatter communication. A transmission apparatus may include generating a plurality of bitsets by fragmenting data based on a predetermined bitset length, mapping the plurality of bitsets to a plurality of switching patterns based on a data size, and controlling a reflection of a background radio frequency (RF) signal based on a corresponding mapped switching pattern, a total number of the plurality of switching patterns may be determined based on the bitset length, and each of the plurality of switching patterns may have a different length.