Due to the rapid development of electronic technologies, it tends to be diverse to access networks besides personal computers. Thanks to the technologies, it is possible for us to learn on the net anytime and anywhere, which propels the progress in e-learning dramatically, and some new research issues arise at the same time. Firstly, owing to the differences in processing power, storage and display resolution of terminals, it will lead to some problems that the same content is sent to heterogeneous terminals. Secondly, since the personalized le...
