According to the meteorological data from 1997~2005 of Anyang Station in the Haihe River Basin,this paper studies the effect of the number of meteorological factors,the length of data series and hidden nodes on forecast accuracy of BP-ET0 model.

The results show that,polymerization temperatures affect the thermodynamics behavior,composition and sequence length of AN/MA copolymers.

Linear decomposition time series analysis has become one of useful tools to investigate runoff characteristics, but how the sequence length affects the results of linear decomposition has not yet been studied in detail.

Simulation results show that this algorithm can stabilize the queue length to the target value and its drop probability is less than random early detection algorithm and PI .

Studies the discrete-time Internet congestion control algorithm based on queue length,thus adjusting the congestion rate in accordance to the queue length connecting the nodes in Internet so as to determine the date transmission rate of source nodes.

RAED(rate adaptive RED)algorithm is applied in indicating congestion levels and counting drop probability using the combined method of business flow rate and average queue length.

The maximum throughput, the queue size, the cell lost probability and the mean time delay of the improved model is calculated.

Based on the mapping function and network configuration,the paper then carried a simulation to determine the QoS of VoIP service that can be provided when they are run over this model using throughput of applications,the queue size at the router and drop ratio of packets as the performance criteria.