A mechanism for efficient CAVLC coding in a hardware implementation of a H. When the 1394 communication is performed with an optical-fiber cable and a UTP cable, it is possible to cope with high-speed communication by arranging bits being not used at a low speed, on a data stream. The EM pressure transmitter is coupled to the pressure sensor. The invention can be used to accelerate the rendering of sparse volume data in medical imaging or other fields. Multiple \u201ccorrect\u201d answers are integrated into the learning system to allow individualized learning experiences in which navigation through the system is at a pace controlled by the learner.