Abstract: A method of preparing a negative electrode for a lithium secondary battery, which includes forming a negative electrode mixture layer including a negative electrode active material on a negative electrode current collector, disposing lithium metal powder on at least a part of the negative electrode mixture layer, pressing the negative electrode mixture layer on which the lithium metal powder is disposed, wetting the pressed negative electrode mixture layer with a first electrolyte solution, and drying the wet negative electrode mixture layer. A battery including the negative electrode of the present invention has enhanced rapid charge/discharge characteristics and enhanced lifespan characteristics.

Abstract: The present disclosure relates to an airburst simulation system and method. The airburst simulation system includes a laser emitting unit to emit laser beam to an airburst aiming position, preset above a target hidden behind an obstacle, such that a warhead is airbursted to shoot the target, a laser detecting unit mounted onto the target to detect an arrival of the laser beam above the target, and a determining unit to measure a distance between the airburst aiming position and an arrival position of the laser detected by the laser detecting unit, and determine whether or not the target has been shot based on the distance. This allows for a simulated engagement using an airburst apparatus, with no harm to human bodies by virtue of the use of laser.

Abstract: Disclosed is a firearm having dual barrels comprising a firearm body which is equipped with a small caliber barrel and a large caliber barrel; a selector installed on one side of the firearm body to select the type of bullet and the mode of firing; a fire control system installed on the firearm body to enable aiming the target through detecting the target both at day and night time; a firearm switch unit installed on the firearm body to transmit the information on the firing of the bullet; a fuse setter installed on the firearm body to transmit the control signal of the fire control system to the fuse of the explosive bullet which is introduced into the large caliber barrel; and a sensor device unit installed on the firearm body to transmit the position of the selector and sensed firing signal to the fire control system.

Abstract: The present disclosure relates to an airburst simulation system and method. The airburst simulation system includes a laser emitting unit to emit laser beam to an airburst aiming position, preset above a target hidden behind an obstacle, such that a warhead is airbursted to shoot the target, a laser detecting unit mounted onto the target to detect an arrival of the laser beam above the target, and a determining unit to measure a distance between the airburst aiming position and an arrival position of the laser detected by the laser detecting unit, and determine whether or not the target has been shot based on the distance. This allows for a simulated engagement using an airburst apparatus, with no harm to human bodies by virtue of the use of laser.

Abstract: Disclosed is a percussion lock installed on a firearm, and more particularly, to a percussion lock wherein the hammer is operated through a link member so that operation of the firearm is possible in a small area, making it possible to design a firearm flexibly and reducing the volume and weight of the firearm. According to the present invention, the percussion lock installed on a firearm to fire a bullet by hitting a firing pin comprises a housing mounted in fixed state to a firearm, a hammer installed on the upper part of the housing for hitting a firing pin, a link member linking the hammer and the housing so that the hammer moves on a curve maintaining horizontal state, and an elastic member supporting the link member with elastic force.

Abstract: Disclosed is a firearm having dual barrels comprising a firearm body which is equipped with a small caliber barrel and a large caliber barrel; a selector installed on one side of the firearm body to select the type of bullet and the mode of firing; a fire control system installed on the firearm body to enable aiming the target through detecting the target both at day and night time; a firearm switch unit installed on the firearm body to transmit the information on the firing of the bullet; a fuse setter installed on the firearm body to transmit the control signal of the fire control system to the fuse of the explosive bullet which is introduced into the large caliber barrel; and a sensor device unit installed on the firearm body to transmit the position of the selector and sensed firing signal to the fire control system.

Abstract: Disclosed is a percussion lock installed on a firearm, and more particularly, to a percussion lock wherein the hammer is operated through a link member so that operation of the firearm is possible in a small area, making it possible to design a firearm flexibly and reducing the volume and weight of the firearm. According to the present invention, the percussion lock installed on a firearm to fire a bullet by hitting a firing pin comprises a housing mounted in fixed state to a firearm, a hammer installed on the upper part of the housing for hitting a firing pin, a link member linking the hammer and the housing so that the hammer moves on a curve maintaining horizontal state, and an elastic member supporting the link member with elastic force.