In order to cooperate with the common embeded processors, optimizing the transfer descriptor and the schedule policy can favor to realize the embeded USB host controller without bus master capability.

New USB device can work without using a PC if the USB host system is placed in an embeded system,which is also a direction for the USB technology,in order to cooperate with the common embeded processors,optimize the transfer descriptor and the schedule policy can favor to realize the embeded USB host controller without bus master capability.

In order to reduce the delay and rejection rates of P2P VOD, a new Multiple Description Coding scheme was proposed, and two concepts, the largest number of lost descriptions and the expected probability, were introduced.

By using poly 2-5, bis(dodecyloxy)-bhenylene vinelene (PDDOPV) as hole transport layer and 8-quinoline aluminum (Alq 3) as electron transport layer, two types of diodes with different thickness of electron transport layer had been made.