A method and system for security processing of a network data stream. In another aspect, a system for determining a predicted performance of a navigation augmentation system includes a long-term monitor for determining a normal performance of the navigation augmentation system and a short-term monitor for determining a predicted performance of the navigation augmentation system based on the normal performance of the navigation augmentation system. When the determination result is negative, the print job is stopped. The optimizing operations are repeated until convergence of optimal solutions obtained by those operations takes place. The swirling flow pattern of the coolant and gas bubble mixture causes the gas bubbles to separate from the liquid coolant. The device also has an internal ring mounted in the rear portion of the cylindrical sleeve so that it can be positioned between the cylindrical sleeve and the first connection element, the internal ring including at least one catch capable of cooperating with the saw-tooth notches of the cylindrical sleeve.