An improved structure industrial computer consisting of a system case, with the system case having a flexible component fastened along the edge at one side and a frame member also fastened to the flexible component. The present invention selects one of a filter signal and a quantized signal as an input signal of a feedback filter in the DFE and update the tap coefficient according to the SAG flag fk by including a main filtering unit, a SAG flag determining unit and a blind feedback controlling unit. The leak detection system provides for a probability of detection of at least 95% and a probability of false alarm of no more than 5%. Each of water exits, provided with a stopping members, are disposed on a base surface of the tube base.