Abstract: The present invention relates to a method for preparing a polyurethane synthetic leather having uniform fine pores therein, by coagulating a polyurethane mixture solution prepared by mixing an additive containing sucrose with a polyurethane resin composition, and then removing the additive in the coagulated polyurethane mixture solution. The present invention can not only form a smooth surface after a sanding process but also improve an air permeability and softness due to fine pores formed in the polyurethane synthetic leather. In addition, the size and density of the fine pores can be optionally adjusted by adjusting the content of the additive, and the present invention can provide various types of synthetic leathers depending on the product use.

Abstract: The present disclosure provides a method for operating a first electronic device. The method includes detecting a movement of the first electronic device, receiving direction information of a second electronic device, and determining an azimuth angle of a heading direction of the first electronic device based on the received direction information of the second electronic device.

Abstract: Multimedia playing apparatuses and methods of measuring hearing characteristics of a user and outputting a sound modulated according to the hearing characteristics of the user are provided. A multimedia playing apparatus includes a sound output unit configured to output a sound comprising of one or more phonemes, and a user interface configured to receive a user response to the phonemes. The multimedia playing apparatus further includes a processor configured to acquire hearing characteristics of a user based on the user response, and determine an output level and/or an output time of the sound for each of frequency bands based on the hearing characteristics of the user. The sound output unit is further configured to output the sound according to the output level and/or the output time of the sound for each of the frequency bands.

Abstract: A method of removing noise from a two-channel signal includes receiving channel signals constituting the two-channel signal; obtaining a noise signal for each channel by removing a target signal from each channel signal by subtracting another channel signal multiplied by a weighted value from each channel signal; estimating a power spectral density (PSD) of diffuse noise from each channel signal; obtaining a target signal including an interference signal for each channel by removing the diffuse noise from each channel signal using the estimated PSD of the diffuse noise; obtaining the interference signal for each channel by removing the diffuse noise from the noise signal for each channel using the estimated PSD of the diffuse noise; and removing the interference signal from the target signal and the interference signal for each channel.

Abstract: A hearing apparatus includes a coil and a coil operation mode selector configured to select either a first coil operation mode for communicating with a wireless communication terminal, or a second coil operation mode for wirelessly charging a battery of the hearing apparatus.

Abstract: Provided is a method and apparatus for low power operation of a binaural hearing aid, the method including determining whether a residual battery exceeds a predetermined threshold level, collecting an external audio signal, in response to whether the residual battery exceeds the predetermined threshold level, and transmitting the collected audio signal to a second hearing aid.

Abstract: A hearing apparatus and method for measuring a distance between an eardrum and the hearing apparatus are provided. The hearing apparatus may include a signal output unit configured to output a first measurement signal, a signal identification unit configured to receive a second measurement signal, and a distance determination unit configured to determine the distance between the user's eardrum and the hearing apparatus.

Abstract: A hearing apparatus includes a coil and a coil operation mode selector configured to select either a first coil operation mode for communicating with a wireless communication terminal, or a second coil operation mode for wirelessly charging a battery of the hearing apparatus.

Abstract: A transmitter and a receiver for reducing power consumption in a frequency modulation-ultra-wideband (FM-UWB) communication system are provided. The transmitter includes a detector configured to generate a pulse signal when an edge of a digital signal is detected. The transmitter further includes a first modulator configured to modulate the digital signal into a first modulation signal based on a value of the digital signal. The transmitter further includes a second modulator configured to modulate the first modulation signal into a second modulation signal based on a frequency of the first modulation signal when the pulse signal is generated.

Abstract: Provided is a switched-capacitor integrator, a method of operating the switched-capacitor integrator, and apparatuses including the switched-capacitor integrator. The switched-capacitor integrator including an amplifier including a first input terminal, a second input terminal, and an output terminal, a first capacitor disposed between the first input terminal and the output terminal, and a switched capacitor circuit configured to sample an input signal in response to control signals, and to integrate a difference between a feedback signal and the input signal while sampling the input signal.

Abstract: An apparatus and method for ultra wideband (UWB) communication, using a dual band pass filter (BPF) is disclosed. The UWB communication apparatus may include a first BPF performing a first band pass filtering with respect to a UWB signal, a second BPF that has a center frequency differing from a center frequency of the first BPF, and performs a second band pass filtering with respect to the UWB signal, a first envelope detector that detects a size of a first signal filtered in the first BPF, a second envelope detector that detects a size of a second signal filtered in the second BPF, and a demodulator that demodulates a UWB signal, using the size of the first signal and the size of the second signal.

Abstract: The present invention provides a method for preparing an aluminum matrix composite by infiltrating aluminum into a preform within a short period of time without a pressurization configuration using a special device as compared to the existing pressure infiltration method. According to one aspect of the present invention, provided is a method for preparing an aluminum matrix composite using pressureless infiltration, the method including: preparing a preform formed of a mixture of raw powders capable of forming ceramic through a combustion synthesis reaction; immersing the preform in an aluminum melt, in which a part of the preform is exposed to an external environment without being immersed in the aluminum melt; and infiltrating molten aluminum into the preform while causing a combustion synthesis reaction in the preform.

Abstract: A device including an optical sensor is provided. The device includes a window including a first region, a second region and a partial region located between the first region and the second region, an optical sensor located inside one region among the first region and the second region, and a light blocking part formed in the partial region of the window.

Abstract: A signal transmission method and apparatus are provided. A signal transmission apparatus may include a time hopping apparatus configured to calculate a difference between values of time hopping patterns corresponding to adjacent symbol transmission periods, and to determine, based on the calculated difference, whether a position of a time hopping pattern corresponding to one of the adjacent symbol transmission periods is to be adjusted, and a transmitter configured to transmit a signal in the adjacent symbol transmission periods based on a determination result obtained by the time hopping apparatus. Additionally, a related signal reception apparatus is provided.

Abstract: A receiver, an operating method of the receiver, and a beamforming radar system including the receiver are provided. A beamforming receiver may include a demodulation circuit configured to receive a signal reflected from an object via an antenna, to demodulate the received signal, and to generate a demodulated signal, and a time delay circuit configured to generate a digital signal by processing the demodulated signal based on reference clock signals, wherein the digital signal including static delay information associated with a static motion of the object, and dynamic delay information associated with a dynamic motion of the object.

Abstract: A pulse generation apparatus includes a delay pulse generator configured to generate a plurality of delay pulses, an amplitude modulator configured to modulate amplitudes of the plurality of delay pulses, and a Gaussian pulse generator configured to generate a Gaussian pulse based on the amplitude-modulated delay pulses.

Abstract: Provided is a switched-capacitor integrator, a method of operating the switched-capacitor integrator, and apparatuses including the switched-capacitor integrator. The switched-capacitor integrator including an amplifier including a first input terminal, a second input terminal, and an output terminal, a first capacitor disposed between the first input terminal and the output terminal, and a switched capacitor circuit configured to sample an input signal in response to control signals, and to integrate a difference between a feedback signal and the input signal while sampling the input signal.

Abstract: A hearing device using multiple batteries and a method of managing power of the hearing device are disclosed, and the method of managing power of a hearing device may include determining, at a processor, to charge an auxiliary battery based on comparing power information of a main battery to power information of the auxiliary battery, and selecting a battery to supply power to the hearing device based on the power information of the main battery.

Abstract: A receiving apparatus for receiving a signal from a transmitting includes a receiving unit configured to receive the signal from the transmitting apparatus; a selecting unit configured to select whether to consider channel information in estimating an offset value between the transmitting apparatus and the receiving apparatus; an offset value estimating apparatus configured to estimate the offset value between the transmitting apparatus and the receiving apparatus either considering the channel information or without considering the channel information based on a selection made by the selecting unit; a synchronization performing unit configured to perform synchronization based on the estimated offset value; and a demodulation unit configured to perform demodulation of the received signal based on a result of performing the synchronization.

Abstract: An apparatus of a Harmonic Rejection Mixer (HRM) for removing a harmonic component and an operating method thereof are provided. The HRM includes a Local Oscillator (LO), at least one frequency converter, at least two mixers, at least one phase converter, and a combiner. The LO generates an LO signal. The at least one frequency converter multiplies the LO signal using different variables to provide the same to at least two mixers. The at least two mixers convert a frequency band of an input signal using the LO signal provided from the LO and the at least one frequency converter. The at least one phase converter controls a phase of an output signal of at least one other mixer excluding one of the at least two mixers. The combiner combines an output signal of the one mixer with an output signal of the at least one phase converter.