Abstract: Disclosed are a method of preparing a carbon-silicon composite powder including A) adding crystalline carbon and a precursor of amorphous carbon to a silicon slurry containing silicon particles and a dispersion medium to prepare a first mixed solution containing silicon particles, crystalline carbon and the precursor of amorphous carbon in a weight ratio of 20 to 70:20 to 70:1 to 19, B) spray drying the first mixed solution to prepare a first composite powder, C) adding the first composite powder to an aqueous solvent containing carbon fibers to prepare a second mixed solution, D) subjecting the second mixed solution to cold isostatic pressing, followed by drying to prepare a second composite powder, and E) screening the second composite powder without pulverization to prepare a carbon-silicon composite powder, a carbon-silicon composite powder produced using the same, and a lithium secondary battery including the same.

Abstract: A wireless power transmission device is provided. The wireless power transmission device includes a power input circuit, a communication module, a transmission coil, a power output circuit configured to apply output power to the transmission coil, and a processor. The processor may be configured to identify that a first input power is received from a first external power source through a first power input circuit, control the communication module to transmit first rating information corresponding to the first input power to the wireless power reception device, control the at least one communication module to receive, from the wireless power reception device, information on a first charging current determined based on the first rating information in the wireless power reception device, and control the power output circuit so that a first output power is applied to the transmission coil, based on the information on the first charging current.

Abstract: An electronic device is provided. The electronic device includes a battery, a sensor module for acquiring a first temperature, which is the temperature of a first portion adjacent to the battery, a power reception unit for wirelessly receiving power from a charging device, a power management module for supplying power to the battery and an internal system of the electronic device, and a processor electrically connected to the sensor module and the power management module, wherein, while the electronic device wirelessly receives power from the charging device, the processor is configured to transmit a first command to the power management module so the power management module cut offs the supply of the power to the battery and supplies the power to the internal system in response to the battery being fully charged, use the sensor module to acquire a second temperature, and control the power, supplied to the internal system.

Abstract: The present invention relates to an anode active material comprising a silicon composite, a preparation method therefor, and a lithium secondary battery comprising same to have excellent lifespan characteristics, output characteristics and safety, the silicon composite comprising: a core formed by coating a first crystalline carbon on the surface of needle-shaped silicon nanoparticles and plate-shaped silicon nanoparticles that differ in aspect ratio; and a shell that surrounds the core and comprises amorphous carbon, in which a second crystalline carbon is positioned on the entire surface of the shell or a part thereof.

Abstract: The present disclosure provides an anode active material comprising a graphene-silicon composite, a manufacturing method therefor, and a lithium secondary battery comprising same, wherein the graphene-silicon composite is a secondary graphene-silicon composite formed by gathering primary graphene-silicon composites on a conductive carbon matrix, and the primary graphene-silicon composites are formed of silicon-containing particles laminated (layered) on a reduced graphene oxide sheet.

Abstract: A wireless charging device in communication with an electronic device is provided. The wireless charging device includes a charging circuit configured to communicate with the electronic device at a first frequency that is included in a frequency band of the electronic device and supple power received from an external power source to the electronic device depending on a communication result at the first frequency, and a control circuit configured to convert the first frequency, based on a response of the electronic device to a first connection signal that is transmitted from the charging circuit to the electronic device.

Abstract: An electronic device acting as a power receiving device and a control method. The electronic device includes a battery, a coil, a reception circuit electrically connected to the coil, a charger a current sensing circuit, and at least one control circuit. The charger supplies a specified voltage to a system and controls the state of charge of the battery by using the voltage supplied from the reception circuit. The current sensing circuit is configured to sense an inrush current caused by the system. The at least one control circuit is configured to transmit a first control signal for requesting to increase a transmission voltage supplied from an external electronic device when an inrush current is detected through the current sensing circuit.

Abstract: A wearable electronic device may include: a display, a housing forming at least part of an exterior of the wearable electronic device, a printed circuit board disposed beneath the display, a plurality of electronic components disposed on the printed circuit board, a rear cover forming at least a part of a rear surface of the wearable electronic device, a conductive coil disposed within a specified proximity of the rear cover, a first electromagnetic shield disposed between the conductive coil and the plurality of the electronic components, and configured to shield a first area covering the conductive coil, and a second electromagnetic shield disposed between the first electromagnetic shield and the plurality of the electronic components, and configured to shield at least an area outside of the first area.

Abstract: An electronic device including a coil, a power transmission circuit electrically connected with the coil, a detection circuit, and a control circuit. The control circuit of the electronic device configured to wirelessly output a first signal for identifying an access of a foreign object by first period intervals through the coil using the power transmission circuit, identify a change of the first signal using the detection circuit, wirelessly output the first signal by the first period intervals in response to a detection value of the changed first signal being less than or equal to a first threshold value, and wirelessly output the first signal by a second period intervals longer than the first period intervals in response to the detection value of the changed first signal exceeding the first threshold value.

Abstract: A wireless charging device in communication with an electronic device is provided. The wireless charging device includes a charging circuit configured to communicate with the electronic device at a first frequency that is included in a frequency band of the electronic device and supple power received from an external power source to the electronic device depending on a communication result at the first frequency, and a control circuit configured to convert the first frequency, based on a response of the electronic device to a first connection signal that is transmitted from the charging circuit to the electronic device.

Abstract: An electronic device acting as a power receiving device and a control method. The electronic device includes a battery, a coil, a reception circuit electrically connected to the coil, a charger a current sensing circuit, and at least one control circuit. The charger supplies a specified voltage to a system and controls the state of charge of the battery by using the voltage supplied from the reception circuit. The current sensing circuit is configured to sense an inrush current caused by the system. The at least one control circuit is configured to transmit a first control signal for requesting to increase a transmission voltage supplied from an external electronic device when an inrush current is detected through the current sensing circuit.

Abstract: An electronic device including a coil, a power transmission circuit electrically connected with the coil, a detection circuit, and a control circuit. The control circuit of the electronic device configured to wirelessly output a first signal for identifying an access of a foreign object by first period intervals through the coil using the power transmission circuit, identify a change of the first signal using the detection circuit, wirelessly output the first signal by the first period intervals in response to a detection value of the changed first signal being less than or equal to a first threshold value, and wirelessly output the first signal by a second period intervals longer than the first period intervals in response to the detection value of the changed first signal exceeding the first threshold value.

Abstract: A lighting device includes a casing having an inlet that introduces external air at one side and an outlet that discharges the introduced air at the other side. A fan is located within the casing to flow external air from an inlet direction to an outlet direction. An inlet cover blocks at least an upper area of the inlet to prevent external air from being directly introduced into the inlet. An air flow channel communicates the inlet and the outside, and includes two contracting flow channels having a reducing sectional area in an advancing direction of air. The two expanding flow channels communicate with the contracting flow channels and have an increasing sectional area in an advancing direction of air, so that in a connection portion of the contracting flow channel and the expanding flow channel, the advancing direction of air is changed.

Abstract: A lighting device includes: a casing having an inlet that introduces external air at one side and an outlet that discharges the introduced air through the inlet at the other side; a fan located within the casing to flow external air from an inlet direction to an outlet direction; an inlet cover that blocks at least an upper area of the inlet to prevent external air from being directly introduced into the inlet; and an air flow channel that communicates the inlet and the outside, wherein the air flow channel includes: two contracting flow channels having a reducing sectional area advancing in an advancing direction of air; and two expanding flow channels that communicate with the contracting flow channels and that have an increasing sectional area advancing in an advancing direction of air, wherein in a connection portion of the contracting flow channel and the expanding flow channel, the advancing direction of air is changed.

Abstract: A plasma lighting system is disclosed. Interference with an electronic device using the same band as that of the plasma lighting system can be avoided by changing the shape of vanes constituting a magnetron, and a filament current of the magnetron at an initial starting stage and that in a normal state are adjusted to be different, thus avoiding interference with a wireless LAN and attenuating noise, and a resonator has a mash form to increase efficiency. Because a rectangular waveguide is bent substantially at a right angle, and the magnetron and the resonator are disposed at one side on the basis of a waveguide space of the waveguide, thus reducing the size and an installation space of the plasma lighting system.

Abstract: A plasma lighting system is disclosed. Interference with an electronic device using the same band as that of the plasma lighting system can be avoided by changing the shape of vanes constituting a magnetron, and a filament current of the magnetron at an initial starting stage and that in a normal state are adjusted to be different, thus avoiding interference with a wireless LAN and attenuating noise, and a resonator has a mash form to increase efficiency. Because a rectangular waveguide is bent substantially at a right angle, and the magnetron and the resonator are disposed at one side on the basis of a waveguide space of the waveguide, thus reducing the size and an installation space of the plasma lighting system.

Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.

Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.