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网络扫描发包速率学习算法
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作者 黄伟武 闫兆腾 +1 位作者 朱红松 孙利民 《信息安全与通信保密》 2016年第3期110-114,117,共6页
不同网络环境中,主机对外网进行的扫描受多种因素影响,如上行带宽、路由器转发能力等,这些因素决定了主机的发包速率不能任意指定,其值过高会引起丢包问题,过低则导致扫描过程十分漫长。如何确定不同网络环境中主机的扫描发包速率,使得... 不同网络环境中,主机对外网进行的扫描受多种因素影响,如上行带宽、路由器转发能力等,这些因素决定了主机的发包速率不能任意指定,其值过高会引起丢包问题,过低则导致扫描过程十分漫长。如何确定不同网络环境中主机的扫描发包速率,使得在上行带宽等资源受限时能达到最佳的扫描效果是一个极大的挑战,为此本文提出了一种网络扫描发包速率学习算法。我们首先从实验数据中获取先验知识,确定算法一些重要参数的初始值,然后在实际探测过程中对特定IP段重复扫描行为,根据实时存活主机数更新优化发包速率,并最终得到最佳速率值。实验结果表明,本算法能在不同网络环境中,通过较短的时间确定主机对外网进行扫描的最佳发包速率,从而在保证扫描效果的同时提高了扫描效率。 展开更多
关键词 网络扫描 发包速率 上行带宽 丢包
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Model of gas exchange dynamics for modified-atmosphere packages containing fresh produce
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作者 刘颖 李云飞 +1 位作者 王如竹 田平海 《Journal of Southeast University(English Edition)》 EI CAS 2005年第3期314-318,共5页
A model for modified-atmosphere packaging (MAP) systems containing fruits and vegetables was developed.The computer simulation was performed to predict the gas mass concentrations inside the packages and was success... A model for modified-atmosphere packaging (MAP) systems containing fruits and vegetables was developed.The computer simulation was performed to predict the gas mass concentrations inside the packages and was successfully verified by experiments with yellow peaches at 5,15 and 25 ℃ using two types of packaging films.A Michaelis-Menten type respiration model with noncompetitive inhibition mechanism due to CO2 was adopted while the respiration rates were measured with an improved permeable system method suitable for either steady or unsteady state.The applicability of the model in the design of MAP systems was demonstrated with a calculation to evaluate film specification and equilibrium concentrations of O2 and CO2 in the package containing yellow peaches. 展开更多
关键词 gas exchange dynamics modified-atmosphere package respiration rate yellow peach
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