An image forming apparatus detects an edge in image data and performs density correction so as to reduce the density of the detected edge. The modulated carrier wave may be transmitted to an acoustic transducer. The cryogenic fluid transport device being positioned within the refrigerator advantageously serves as device for providing the necessary mechanical force necessary to move the heat transfer fluid from the cryogenically cooled surface to the remote thermal load. The instruments can be displaced into and out of the working position by means of a motor and at least one of the instruments can be rotated in its working position by means of a motor. The traffic analysis data is forwarded to ingress and egress processing elements in real time, and ingress and egress traffic processing operations are dynamically adjusted in view of the traffic analysis data. The rate select can be generated automatically, or can be transmitted from a host device.