A security system having corresponding intelligent voice response and a voice response method thereof aims to output a corresponding intelligent voice response message according to the identification of visitors. A device to measure the brake force for railroad vehicles, which uses a sensor, the main part of which is a prismatic steel plate with strain gauges on both sides. In another embodiment, a method for reducing data access latency experienced by a user in a computer network is provided. The rectangular conductive parts of a plurality of the electric wires are piled in a brick laying manner to be bonded by welding.