在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1&...在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1</sub>-α<sub>n</sub>=f（n）,则α<sub>2</sub> -α<sub>1</sub>=f（1）,α<sub>3</sub>-α<sub>2</sub>=f（2）,…,α<sub>n-1</sub>-α<sub>n-2</sub>=f（n-2）,a<sub>n</sub>-a<sub>n-1</sub>= f（n-1）。上面各式相加,得α<sub>n</sub>=α<sub>1</sub>+sum from k=1 to n-1 f（k）（n≥2）。展开更多
A variable structure based control scheme was proposed for Active Queue Management(AQM) by using sliding model algorithm and reach law method. This approach aims to address the tradeoff between good performance and ro...A variable structure based control scheme was proposed for Active Queue Management(AQM) by using sliding model algorithm and reach law method. This approach aims to address the tradeoff between good performance and robustness with respect to the uncertainties of the round-trip time and the number of active connections. Ns simulations results show that the proposed design significantly outperforms the peer AQM schemes in terms of fluctuation in the queue length, packet throughput, and loss ratio. The conclusion is that proposed scheme is in favor of the achievement to AQM objectives due to its good transient and steady performance.展开更多
文摘在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1</sub>-α<sub>n</sub>=f（n）,则α<sub>2</sub> -α<sub>1</sub>=f（1）,α<sub>3</sub>-α<sub>2</sub>=f（2）,…,α<sub>n-1</sub>-α<sub>n-2</sub>=f（n-2）,a<sub>n</sub>-a<sub>n-1</sub>= f（n-1）。上面各式相加,得α<sub>n</sub>=α<sub>1</sub>+sum from k=1 to n-1 f（k）（n≥2）。
文摘A variable structure based control scheme was proposed for Active Queue Management(AQM) by using sliding model algorithm and reach law method. This approach aims to address the tradeoff between good performance and robustness with respect to the uncertainties of the round-trip time and the number of active connections. Ns simulations results show that the proposed design significantly outperforms the peer AQM schemes in terms of fluctuation in the queue length, packet throughput, and loss ratio. The conclusion is that proposed scheme is in favor of the achievement to AQM objectives due to its good transient and steady performance.
