Abstract: An embodiment relates to a motor including a shaft; a rotor which is coupled to the shaft; a stator which is disposed outside the rotor; a housing which accommodates the rotor and the stator and has an opening formed at one side thereof; and a cover which covers the opening. The cover includes a cover plate portion; and a side wall which extends axially from the cover plate portion, and at least three grooves are formed in the side wall. Accordingly, the motor according to the embodiment can guarantee the sealing performance while preventing the bearing from being damaged when the rotor is assembled on the inside of the stator.

Abstract: A low dropout voltage regulator includes a differential amplifier configured to output an amplified voltage by comparing a feedback voltage with a reference voltage, a pass transistor configured to receive a power input voltage into a source terminal, the amplified voltage into a gate terminal, and output an output voltage into a drain terminal, distribution resistors connected between the drain terminal and the ground terminal, configured to generate the feedback voltage, and an inrush preventer, connected in parallel between the differential amplifier and the pass transistor, and configured to output a regulated amplified voltage into the gate terminal according to a control signal, wherein the inrush preventer comprises a determiner configured to output an enable signal that is turned on during an initial driving period, and a limiter configured to output the regulated amplified voltage according to the enable signal.

Abstract: A method may be used for manufacturing a semiconductor element. The method may include the following steps: preparing a substrate; forming a semiconductor layer on the substrate, wherein the semiconductor layer includes crystallized two-dimensional layers; forming a source electrode and a drain electrode on the semiconductor layer; forming an semiconductor member by wet etching the semiconductor layer using sodium hypochlorite as an etchant, wherein the wet etching results in a residue; and removing the residue using purified water and an inert gas.

Abstract: A low dropout voltage regulator includes a differential amplifier configured to output an amplified voltage by comparing a feedback voltage with a reference voltage, a pass transistor configured to receive a power input voltage into a source terminal, the amplified voltage into a gate terminal, and output an output voltage into a drain terminal, distribution resistors connected between the drain terminal and the ground terminal, configured to generate the feedback voltage, and an inrush preventer, connected in parallel between the differential amplifier and the pass transistor, and configured to output a regulated amplified voltage into the gate terminal according to a control signal, wherein the inrush preventer comprises a determiner configured to output an enable signal that is turned on during an initial driving period, and a limiter configured to output the regulated amplified voltage according to the enable signal.

Abstract: Disclosed are a catalyst for generating hydrogen and a method of preparing the same. The catalyst for generating hydrogen according to an embodiment of the present disclosure includes a conductive textile composed of a polymer fiber and a metal film, and a transition metal chalcogen compound thin film, wherein the surface of the polymer fiber is coated with the metal film and the transition metal chalcogen compound thin film is formed on the conductive textile. By combination of the transition metal chalcogen compound thin film and the conductive textile, the catalyst for generating hydrogen has excellent catalytic properties, such as low onset potential, small Tafel slope, high exchange current density and high stability.

Abstract: There is provided a hub bearing unit with multiple rows of rolling elements. A hub has one or more inner race surfaces. An inner ring is seated on an outer peripheral surface of the hub and has one or more inner race surfaces thereon. An outer ring is formed with outer race surfaces as many as inner race surfaces formed at the hub and the inner ring. Rolling elements are disposed between the outer race surfaces and the inner race surfaces. Cages are disposed to maintain circumferential intervals of the rolling elements. The outer ring is formed with three or more outer race surfaces. The rolling elements are arranged in three or more rows. The arrangement of multiple-row rolling elements enhances the life of the bearing. Manufacturing costs are curtailed and rolling resistance is reduced compared to the tapered roller bearing.

Abstract: There is provided a hub bearing unit with multiple rows of rolling elements. A hub has one or more inner race surfaces. An inner ring is seated on an outer peripheral surface of the hub and has one or more inner race surfaces thereon. An outer ring is formed with outer race surfaces as many as inner race surfaces formed at the hub and the inner ring. Rolling elements are disposed between the outer race surfaces and the inner race surfaces. Cages are disposed to maintain circumferential intervals of the rolling elements. The outer ring is formed with three or more outer race surfaces. The rolling elements are arranged in three or more rows. The arrangement of multiple-row rolling elements enhances the life of the bearing. Manufacturing costs are curtailed and rolling resistance is reduced compared to the tapered roller bearing.

Abstract: A Bluetooth headset is disclosed that includes a body having a microphone and an earphone having a Bluetooth module therein; an ear hook having a curved shape, fixed to the body, and worn on a user's ear; and an antenna module disposed to the ear hook. The antenna module includes an antenna radiator mounted inside the ear hook; and an electrical connection element which is electrically connected to the antenna radiator, is drawn out from one connection end of the body of the ear hook, and is power-fed by the Bluetooth module included in the body.

Abstract: Disclosed is a built-in antenna module for a portable wireless terminal with a mainboard. In the built-in antenna module, a carrier fixed on the mainboard has a top surface with a predetermined area and a side surface with a predetermined height, at least one communication radiator is installed on a first predetermined portion of the top surface of the carrier, and a Bluetooth radiator is installed on a second predetermined portion of the top surface of the carrier. Also, the communication radiator and the Bluetooth radiator are electrically connected to the mainboard. Since the communication radiator and the Bluetooth radiator are installed within the same built-in antenna module of the portable wireless terminal, installation of an additional Bluetooth radiator is not required, thereby reducing the size of the portable wireless terminal.