针对移动自组网络(mobile Ad hoc network,MANET)的数据传输机制和数据吞吐量问题,提出了一种MANET中基于二次置换多项式的滑动窗口网络编码(quadratic permutation polynomials-based sliding window network coding,QPPSWNC)算法。该...针对移动自组网络(mobile Ad hoc network,MANET)的数据传输机制和数据吞吐量问题,提出了一种MANET中基于二次置换多项式的滑动窗口网络编码(quadratic permutation polynomials-based sliding window network coding,QPPSWNC)算法。该算法根据QPP理论优化滑动窗口的大小,对进入滑动窗口中的分组进行网络编码操作,恢复原始数据分组,降低每个滑动窗口的编码/解码复杂性。利用NS-2仿真器进行了仿真实验,分析本文算法性能。仿真实验结果表明,相较于典型的Block-LDPC和ACODI算法,本文算法可以优化MANET中编码开销、解码时延和网络吞吐量等性能。展开更多
We investigate high time resolution data obtained by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)during the flare event on 2022 April 21 at 01:52 UT.Several subpeaks with durat...We investigate high time resolution data obtained by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)during the flare event on 2022 April 21 at 01:52 UT.Several subpeaks with durations of 4-6 s have been detected in the hard X-ray precursor phase,and the key feature is that they appear in pairs and seem like double-peak struc-tures.These subpeaks are rarely observed in hard X-ray band and confirmed by the microwave obtained by Nobeyama Radio Polarimeters(NoRP)and Radio Solar Telescope Network(RSTN).While an exponential function can describe the continuum component of the time profile from the precursor to part of the impulsive phase.The periods of quasi-periodic pulsations(QPPs)are detected to be about 7.3 and 12.8 s for the precursor and impulsive phase,respectively,with at least 95%confidence level.The paired QPPs are assumed to be double-peak QPPs and then the scenario of current loop coalescence model is found to be in good agreement with our observation.The precursor phase can be interpreted as the oscillating coalescence of two islands,while the impulsive phase can be interpreted as more islands to coalesce one by one to form larger islands.展开更多
文摘针对移动自组网络(mobile Ad hoc network,MANET)的数据传输机制和数据吞吐量问题,提出了一种MANET中基于二次置换多项式的滑动窗口网络编码(quadratic permutation polynomials-based sliding window network coding,QPPSWNC)算法。该算法根据QPP理论优化滑动窗口的大小,对进入滑动窗口中的分组进行网络编码操作,恢复原始数据分组,降低每个滑动窗口的编码/解码复杂性。利用NS-2仿真器进行了仿真实验,分析本文算法性能。仿真实验结果表明,相较于典型的Block-LDPC和ACODI算法,本文算法可以优化MANET中编码开销、解码时延和网络吞吐量等性能。
基金supported by the National Natural Science Foundation of China (Grant Nos. U1938102, and 11973092)the National Program on Key Research and Development Project (Grant No. 2016YFA0400802)supported by the Surface Project of Jiangsu Province (Grant No. BK20211402)
文摘We investigate high time resolution data obtained by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)during the flare event on 2022 April 21 at 01:52 UT.Several subpeaks with durations of 4-6 s have been detected in the hard X-ray precursor phase,and the key feature is that they appear in pairs and seem like double-peak struc-tures.These subpeaks are rarely observed in hard X-ray band and confirmed by the microwave obtained by Nobeyama Radio Polarimeters(NoRP)and Radio Solar Telescope Network(RSTN).While an exponential function can describe the continuum component of the time profile from the precursor to part of the impulsive phase.The periods of quasi-periodic pulsations(QPPs)are detected to be about 7.3 and 12.8 s for the precursor and impulsive phase,respectively,with at least 95%confidence level.The paired QPPs are assumed to be double-peak QPPs and then the scenario of current loop coalescence model is found to be in good agreement with our observation.The precursor phase can be interpreted as the oscillating coalescence of two islands,while the impulsive phase can be interpreted as more islands to coalesce one by one to form larger islands.
