Abstract: A method for forming through-via metal wiring is disclosed. According to the method, through-via metal wiring can be formed with excellent plating quality without an expensive sputtering process by bonding a metal foil to one side of a substrate having a through-via formed therein and using the foil as a metal seed layer.

Abstract: The present invention provides a method for manufacturing a hollow composite structure by forming a prepreg product using a plurality of prepregs, forming a soft coating layer on an inner surface of the prepreg product, and compressing the prepreg product by applying pressurized air to the coating layer and, at the same time, applying heat to the prepregs.

Abstract: A vehicle body structure is configured such that not only can a pillar that is a vertical member of a vehicle body, for example, a bus, be joined to a rail that is a horizontal member without conducting a welding process, but also the strength of the vehicle body can be enhanced, thus preventing the generation of noise and vibrations, improving the durability of the vehicle body structure, and facilitating assembly work.

Abstract: The present invention provides a method for manufacturing a hollow composite structure by forming a prepreg product using a plurality of prepregs, forming a soft coating layer on an inner surface of the prepreg product, and compressing the prepreg product by applying pressurized air to the coating layer and, at the same time, applying heat to the prepregs.

Abstract: The present invention relates to a bus frame having a center space frame capable of minimizing bending deformation at the portion where a center frame and a rear frame are connected to each other with first and second plates, thereby reducing any possible deformations in the entire bus frame. The bus frame according to the present invention includes a center space frame which comprises a center frame formed by a plurality of cross bars, reinforcing bars, and side bars disposed to a space, a plurality of plates connected to the reinforcing bars and side bars, and a reinforcing frame part constructed at a portion where the reinforcing bars and the plates are interconnected to reinforce a structural stiffness. The reinforcing frame part comprises a plurality of horizontal and vertical reinforcing beams to connect a plurality of reinforcing bars to each other, and the horizontal reinforcing beams are connected each other by an accessory vertical reinforcing beam.