A method and an apparatus for animating transition among a dynamic graph series including a preceding graph and a succeeding graph which are temporally sequentially displayed. Initially, a secure communication mode of communication is enabled at a first computer without a user entering any cryptographic information for establishing the secure communication mode of communication. A method of surface hardening a screw includes carbon enriching the screw to at least a 0. The machine readable instructions, when executed by the one or more processors, cause the system to receive an image including a trailer, determine a trailer characteristic from the image using image analysis logic stored in the one or more memory modules, and calculate the trailer brake control parameter based on the trailer characteristic.