In this paper, it is shown a new scheme called early selective drop (ESD) that uses both load and average queue length to determine congestion and pa.

Growth variation of Picea koraiensis and early selection;

On the basis of review of sexual improvement,the paper discusses the possibility for clone improvement and corresponding key issues,such as establishing of breeding groups,determining of early selection age and improving of clone propagation.

By sixyear investigation into survival rate of forestation,growth,primary form quality and character,adaptability and ability to insectresistance and diseaseresistance,their status of heredity and variance have been primarily mastered,which provides scientific foundation for early selection of heredityimproved of poplar.

Analysis of selective discarding traffic of IP network by queue theory;

A new selective discard algorithm is devised to achieve approximately fair bandwidth allocation between responsive flows and unresponsive flows.