An information retrieval system includes a query revision architecture providing one or more query revisers, each of which implements a query revision strategy. The air filter assembly also includes a second filter member having a tapered cylinder configuration, a first end having a first diameter, a second end having a second diameter, wherein the first diameter is greater than the second diameter, and is constructed of a second filtering material. High frequency voltage is then applied between the active electrode and one or more return electrode to non-thermally generate a plasma adjacent to the active electrode, and to volumetrically remove or ablate at least a portion of the target tissue. All data are maintained in an encrypted format and the system is further secured by separating the person’s medical history from his or her personal information, such as name, address and credit card information. In order to process the stones on their top side, they are tilted on an axis extending perpendicularly andor transversely to the transport direction at the processing area by uneven areas in the transport route. The GMIC may be connected to a display over a bi-directional serial link according to the display serial interface protocol and to a camera over a uni-directional serial link and a bi-directional control link according to the camera serial interface so that the host controls the display and camera indirectly through the GMIC.