Abstract: A liquid crystal display (LCD) comprising an LCD panel on which an electrode pad is provided; a driving part connected to the electrode pad and applying a driving signal to the LCD panel; a light source part providing light to a rear surface of the LCD panel; and a circuit board comprising a driving circuit part applying a driving control signal to the driving part and an inverter providing a light source driving voltage to the light source part. Accordingly, the LCD may improve work efficiency in a modular assembly process and decrease voltage overload of a voltage converter.

Abstract: Disclosed is a disposable ear plug for protecting a user's ears from noise. The disposable ear plug which includes a disposable soundproofing sheet (10) including a base sheet (15) such as a crumplable paper and an artificial cell membrane containing water or oil. The disposable soundproofing sheet is irregularly crumpled at the center thereof to form a crumpled part (18) and the crumpled part is inserted in a depression of an auricle while wholly covering an ear, thereby shielding the user's ears from unpleasant noises while allowing the user to hear attenuated sounds and protecting the user from earaches caused by the insertion of the ear plug into an external auditory canal of the ear, and preventing discomfort from the sense of an alien substance embedded in the ear. Furthermore, the degree of noise attenuation is controlled by adjusting the crumpling of the soundproofing sheet.

Abstract: Disclosed is a wireless positioning system and method that can perform a high-precision position tracking. The wireless positioning system includes a target device that is an object of wireless positioning, beacon devices and a processing unit. The beacon devices transmits wireless signals and sense reception time points of the wireless signals transmitted from the other beacon devices and the target device and received at time points after the transmission of the wireless signal. The target device receives the wireless signal transmitted from at least one of the beacon devices, and then transmits the wireless signal to the beacon devices. The processing unit obtains the position of the target device by calculating distances between the beacon devices and the target device using information about the reception time points of the wireless signals sensed by the respective beacon devices.

Abstract: Disclosed is a device for recording a curing temperature history on precast concrete products, which is buried in a precast concrete product so as to record curing temperature and time histories during a steam curing procedure and to inform a user/inspector of recorded data, thereby controlling the quality of the steam curing concrete products.

Abstract: Disclosed is a device for recording a curing temperature history on precast concrete products, which is buried in a precast concrete product so as to record curing temperature and time histories during a steam curing procedure and to inform a user/inspector of recorded data, thereby controlling the quality of the steam curing concrete products.

Abstract: A signal coupling apparatus for communication by a medium voltage power line comprises a housing with an inner cavity; an electrode formed on one edge of the housing, one end of the electrode connected to an external medium voltage lead line; a coupling capacitor formed within the cavity and connected to the other end of the electrode; a drain coil formed within the cavity and connected to the coupling capacitor; a power-sided ground terminal formed on one edge of the housing, one end of the ground terminal connected to the drain coil and the other end of the ground terminal connected to a ground terminal of a power system; and a communication-sided connection terminal formed on one edge of the housing, one end of the connection terminal connected to the coupling capacitor and the other end of the connection terminal connected to an external communication equipment.

Abstract: A signal coupling apparatus for communication by a medium voltage power line comprises a housing with an inner cavity; an electrode formed on one edge of the housing, one end of the electrode connected to an external medium voltage lead line; a coupling capacitor formed within the cavity and connected to the other end of the electrode; a drain coil formed within the cavity and connected to the coupling capacitor; a power-sided ground terminal formed on one edge of the housing, one end of the ground terminal connected to the drain coil and the other end of the ground terminal connected to a ground terminal of a power system; and a communication-sided connection terminal formed on one edge of the housing, one end of the connection terminal connected to the coupling capacitor and the other end of the connection terminal connected to an external communication equipment.