Abstract: Disclosed herein is a prepreg including: a reinforcement substrate; and a polymer resin layer formed by impregnating a polymer resin containing a liquid crystal oligomer and an inorganic filler on the reinforcement substrate, wherein an impregnation ratio of the polymer resin is 60 to 85 wt., whereby a product manufactured by using the prepreg may have excellent coefficient of thermal expansion and thermal properties.

Abstract: The present invention relates to a resin composition for a package substrate and a package substrate comprising a core layer and a prepreg using the same, which include a polyester amide liquid crystal oligomer, a bisphenol tetrafunctional epoxy resin, a curing agent, and an inorganic filler, wherein the bisphenol tetrafunctional epoxy resin has a viscosity of greater than 20,000 cps. According to the resin composition for a package substrate in accordance with the present invention can provide a package substrate with reduced substrate warpage by improving heat radiation characteristics of a substrate material. Further, it is possible to improve defects by reducing delamination between a chip and the substrate or occurrence of cracks of solder balls through the reduced substrate warpage characteristics.

Abstract: There is provided a resin composition for a thermal radiation board including: 20 wt % to 50 wt % of a liquid crystal oligomer represented by particular Chemical Formulas; 10 wt % to 40 wt % of an epoxy resin; and 10 wt % to 40 wt % of an inorganic filter.

Abstract: Disclosed herein are an epoxy resin composition for a printed circuit board, an insulating film, a prepreg, and a multilayer printed circuit board, the epoxy resin composition including a liquid crystal oligomer having a low coefficient of thermal expansion and an improved glass transition temperature, and the like.

Abstract: Disclosed herein are an epoxy resin composition, an insulating film using the same, and a multilayer printed circuit board; more particularly, an epoxy resin composition including a liquid crystal capable of lowering the coefficient of thermal expansion, improving chemical resistance, and increasing the glass transition temperature, an insulating film or prepreg manufactured by using the epoxy resin composition, and a multilayer printed circuit board including the insulating film or prepreg.

Abstract: Disclosed herein are an inductor and a method of manufacturing the same. More specifically, in the inductor according to the present invention, a coil with a fine pattern may be formed, and an insulating resin composite including liquid crystal oligomer for reducing occurrence of deformation of the coil may be used for an insulating substrate.

Abstract: Disclosed herein are an insulating resin composition, an insulating film manufactured therefrom, and a multilayer printed circuit board, and more specifically, in a build-up manner of multilayer printed circuit board, an insulating epoxy resin composition including a liquid crystal oligomer or the like capable of decreasing a dissipation factor, a dielectric constant, and a coefficient of thermal expansion, an insulating film manfuactured by using the insulating epoxy resin composition, and a multilayer printed circuit board having multiple layers obtained by allowing inner circuits formed of copper (Cu) to be insulated by using the insulating film.

Abstract: Disclosed is a method for controlling travel of construction heavy equipment with electronic joysticks. The method includes the steps of; inputting a joystick travel function selection signal, first manipulation signals of the joysticks and second manipulation signals of acceleration pedals into a controller; determining whether a joystick travel function is selected or released; when the joystick travel function is selected, performing long-distance travel; and when the joystick travel function is released, performing a work. The working unit such as the boom and the arm and the traveling unit can be selectively driven by using the electronic joystick. Thus, the driver can control the travel of the construction heavy equipment in a comfort sitting posture.

Abstract: The present invention discloses a hydraulic cylinder suspension method for actively controlling shock-induced vibration when a hydraulic cylinder in a construction vehicle makes a sudden stop, the method comprising the steps of: determining whether the hydraulic cylinder makes a sudden stop; receiving a pressure signal; determining an operational direction of the hydraulic cylinder during a sudden stop of the hydraulic cylinder; and supplying hydraulic fluid to large and small chambers of the hydraulic cylinder or returning to a tank.

Abstract: A choke valve of the clutch release cylinder wherein the actuating oil is slowly discharged when the clutch pedal is released, and when the clutch pedal is depressed, resistance to the actuating oil is minimized for the actuating oil to be swiftly and smoothly supplied to the clutch release cylinder, thereby improving the responsiveness of the clutch and preventing occurrences of noise and vibration when the clutch is in operation.

Abstract: Disclosed is a method for controlling travel of construction heavy equipment with electronic joysticks. The method includes the steps of; inputting a joystick travel function selection signal, first manipulation signals of the joysticks and second manipulation signals of acceleration pedals into a controller; determining whether a joystick travel function is selected or released; when the joystick travel function is selected, performing long-distance travel; and when the joystick travel function is released, performing a work. The working unit such as the boom and the arm and the traveling unit can be selectively driven by using the electronic joystick. Thus, the driver can control the travel of the construction heavy equipment in a comfort sitting posture.

Abstract: The present invention discloses a hydraulic cylinder suspension method for actively controlling shock-induced vibration when a hydraulic cylinder in a construction vehicle makes a sudden stop, the method comprising the steps of: determining whether the hydraulic cylinder makes a sudden stop; receiving a pressure signal; determining an operational direction of the hydraulic cylinder during a sudden stop of the hydraulic cylinder; and supplying hydraulic fluid to large and small chambers of the hydraulic cylinder or returning to a tank.

Abstract: A choke valve of the clutch release cylinder wherein the actuating oil is slowly discharged when the clutch pedal is released, and when the clutch pedal is depressed, resistance to the actuating oil is minimized for the actuating oil to be swiftly and smoothly supplied to the clutch release cylinder, thereby improving the responsiveness of the clutch and preventing occurrences of noise and vibration when the clutch is in operation.

Abstract: Disclosed is a fire-fighting nozzle integrated with a lighting apparatus. The lighting apparatus is integrally set within the housing of the nozzle so as to illuminate a target area at the scene of a fire without failure, thus allowing a firefighter to precisely spray water to the target area. The lighting apparatus comprises a bulb housing holding a bulb therein. An interior housing is longitudinally set within the nozzle housing, with the bulb housing being fitted into the front end of the internal housing. A connector is fixed to the inside surface of the nozzle housing at one end thereof without closing the water passage of the nozzle housing. The above connector is also assembled with the rear end of the internal housing through a screw-type engagement so as to allow the internal housing to be longitudinally positioned along the central axis within the water passage of the nozzle housing.