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PeerCast节点选择机制的分析及改进
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作者 杨雪 《福建电脑》 2010年第2期170-171,211,共3页
本文通过对PeerCast传输源选择的参数进行分析及实验跟踪,发现了PeerCast在传输源选择上存在的问题,针对该问题,提出了基于物理延迟选择传输源的新思路,并进行了实现和实验验证。
关键词 P2P流媒体 PeerCast 节点选择 物理延迟
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Transient Properties of a Bistable System with Delay Time Driven by Non-Gaussian and Gaussian Noises:Mean First-Passage Time 被引量:1
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作者 LI Dong-Xi XU Wei GUO Yong-Feng LI Gao-Jie 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第9期669-673,共5页
The mean first-passage time of a bistable system with time-delayed feedback driven by multiplicative non-Gaussian noise and additive Gaussian white noise is investigated. Firstly, the non-Markov process is reduced to ... The mean first-passage time of a bistable system with time-delayed feedback driven by multiplicative non-Gaussian noise and additive Gaussian white noise is investigated. Firstly, the non-Markov process is reduced to the Markov process through a path-integral approach; Secondly, the approximate Fokker-Planck equation is obtained by applying the unified coloured noise approximation, the small time delay approximation and the Novikov Theorem. The functional analysis and simplification are employed to obtain the approximate expressions of MFPT. The effects of non-Gaussian parameter (measures deviation from Gaussian character) r, the delay time τ, the noise correlation time to, the intensities D and a of noise on the MFPT are discussed. It is found that the escape time could be reduced by increasing the delay time τ, the noise correlation time τ0, or by reducing the intensities D and α. As far as we know, this is the first time to consider the effect of delay time on the mean first-passage time in the stochastic dynamical system. 展开更多
关键词 mean first-passage time delay time non-Gaussian noise Gaussian noise bistable system
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Stochastic Resonance in a Bistable System with Time-Delayed Feedback Loops
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作者 LI Dong-Xi XU Wei WANG Liang XU Yong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第8期396-402,共7页
The phenomenon of stochastic resonance of a bistable system subjected to linear time-delayed feedback loops driven by multiplieative Gaussian coloured noise and additive Gaussian white noise is investigated. Firstly, ... The phenomenon of stochastic resonance of a bistable system subjected to linear time-delayed feedback loops driven by multiplieative Gaussian coloured noise and additive Gaussian white noise is investigated. Firstly, the analytic expression of the quasi-steady distribution function Ps (x, t) is derived by applying the unified coloured noise approximation and the Novikov Theorem; Secondly, the expression of the signal-to-noise ratio (SNR) is obtained in the adiabatic limit to quantify the stochastic resonance. Finally, tile effects of the linear coefficient a, the nonlinear coefficient b, the linear time-delayed feedback coefficient c and the delay time r on Ps(x,t) and SNR^± are discussed. It is found that the effects of the linear coefficient and the nonlinear coefficient, the positive linear time-delayed feedback coefficient and the negative linear time-delayed feedback coefficient, the positive delayed time and the negative delayed time on Ps(x,t) and SNR^± are different, respectively. This discussion would be helpful to the study of the system reliability and controlling stochastic resonance. 展开更多
关键词 stochastic resonance linear time-delayed feedback loops bistable system
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