Concurrent Transmission Performance Modeling of Wireless Multimedia Sensor Network and Its Experimental Evaluation

针对无线多媒体传感器网络（wireless multimedia sensor network，WMSN）在多路视频并发传输性能方面缺乏定量化评估的问题，对WMSN的并发性能进行了建模分析与实验验证．首先利用排队论和概率论原理构造了一个基于IEEE 802.11的WMSN数据链路层延迟模型，为实验提供理论依据．而后实验测量了基于IEEE 802.11的WMSN在不同网络拓扑下，不同因素（如距离、跳数、并发视频数）对视频评价指标（延迟、抖动、信道利用率）的影响．理论及实验结果表明，IEEE 802.11协议仅能支持四路以下视频并发传输，不适合高并发视频传输，亟待开展WMSN专属协议及算法的研究

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies