For an ordinary operator,it is comparatively studied that how quick inputting speed of Chinese characters may be acquired with phonetic coding,shape coding and combining coding of phonetie,and how difficult for him to learn the three kinds of coding in this experiment.

Based on the idea that both input/output rate and queue length can help the determination of the accurate (drop) (probability in the network,) an algorithm called rate/queue controller (RQC) is presented.