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搜索结果:找到“宋玉蓉”相关结果152条
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  • 【期刊】 Global dynamics of a novel multi-group model for computer worms

    刊名:Chinese Physics B 作者:宋玉蓉 ; 巩永旺 ; 蒋国平 关键词:computer worm ; multi-group model ; Lyapunov function ; global dynamics 机构:College ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications ; School ; Information ; Engineering ; Yancheng ; Institute ; Technology 年份:2013
    摘要:In this paper, we study worm dynamics in computer networks composed of many autonomous systems. A novel multigroup SIQR (susceptible-infected-quarantined-removed) model is proposed for computer worms by explicitly considering anti-virus measures and the network infrastructure. Then, the basic reproduction number of worm R0 is derived and the global dynamics of the model are established. It is shown that if R0 is less than or equal to 1, the disease-free equilibrium is globally asymptotically stable and the worm dies out eventually, whereas, if R0 is greater than 1, one unique endemic equilibrium exists and it is globally asymptotically stable, thus the worm persists in the network. Finally, numerical simulations are given to illustrate the theoretical results.
  • 【期刊】 Hash function construction using weighted complex dynamical networks

    刊名:Chinese Physics B 作者:宋玉蓉 ; 蒋国平 关键词:hash function ; weighted complex dynamical networks ; chaotic map ; cryptography 机构:College ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications 年份:2013
    摘要:A novel scheme to construct a hash function based on a weighted complex dynamical network (WCDN) generated from an original message is proposed in this paper. First, the original message is divided into blocks. Then, each block is divided into components, and the nodes and weighted edges are well defined from these components and their relations. Namely, the WCDN closely related to the original message is established. Furthermore, the node dynamics of the WCDN are chosen as a chaotic map. After chaotic iterations, quantization and exclusive-or operations, the fixed-length hash value is obtained. This scheme has the property that any tiny change in message can be diffused rapidly through the WCDN, leading to very different hash values. Analysis and simulation show that the scheme possesses good statistical properties, excellent confusion and diffusion, strong collision resistance and high efficiency.
  • 【期刊】 Epidemic spreading on a scale-free network with awareness

    刊名:Chinese Physics B 作者:宋玉蓉 ; 鲁延玲 ; 蒋国平 关键词:scale-free network ; awareness ; vaccination ; epidemic threshold 机构:College ; College ; Computer ; Nanjing ; University ; Posts ; Telecommunications ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications 年份:2012
    摘要:This paper presents a modified susceptible-infected-recovered(SIR) model with the effects of awareness and vaccination to study the epidemic spreading on scale-free networks based on the mean-field theory.In this model,when susceptible individuals receive awareness from their infected neighbor nodes,they will take vaccination measures.The theoretical analysis and the numerical simulations show that the existence of awareness and vaccination can significantly improve the epidemic threshold and reduce the risk of virus outbreaks.In addition,regardless of the existence of vaccination,the awareness can increase the spreading threshold and slow the spreading speed effectively.For a given awareness and a certain spreading rate,the total number of infections reduces with the increasing vaccination rate.
  • 【期刊】 Fault diagnosis of time-delay complex dynamical networks using output signals

    刊名:Chinese Physics B 作者:宋玉蓉 ; 刘昊 ; 樊春霞 ; 蒋国平 关键词:time-delay complex dynamical networks ; fault diagnosis ; observer ; output variable 机构:College ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications 年份:2010
    摘要:This paper proposes a novel approach for fault diagnosis of a time-delay complex dynamical network.Unlike the other methods,assuming that the dynamics of the network can be described by a linear stochastic model,or using the state variables of nodes in the network to design an adaptive observer,it only uses the output variable of the nodes to design an observer and an adaptive law of topology matrix in the observer of a complex network,leading to simple design of the observer and easy realisation of topology monitoring for the complex networks in real engineering.The proposed scheme can monitor any changes of the topology structure of a time-delay complex network.The effectiveness of this method is successfully demonstrated by virtue of a complex networks with Lorenz model.
  • 【期刊】 Epidemic spreading in scale-free networks including the effect of individual vigilance

    刊名:Chinese Physics B 作者:宋玉蓉 ; 巩永旺 ; 蒋国平 关键词:scale-free network ; susceptible-infected-recovered model ; individual vigilance ; epidemic 机构:College ; College ; Computer ; Nanjing ; University ; Posts ; Telecommunications ; School ; Information ; Engineering ; Yancheng ; Institute ; Technology ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications 年份:2012
    摘要:In this paper, we study the epidemic spreading in scale-free networks and propose a new susceptible-infected-recovered (SIR) model that includes the effect of individual vigilance. In our model, the effective spreading rate is dynamically adjusted with the time evolution at the vigilance period. Using the mean-field theory, an analytical result is derived. It shows that individual vigilance has no effect on the epidemic threshold. The numerical simulations agree well with the analytical result. Furthermore, we investigate the effect of individual vigilance on the epidemic spreading speed. It is shown that individual vigilance can slow the epidemic spreading speed effectively and delay the arrival of peak epidemic infection.
  • 【期刊】 Epidemic propagation on adaptive coevolutionary networks with preferential local-world reconnecting strategy

    刊名:Chinese Physics B 作者:宋玉蓉 ; 蒋国平 ; 巩永旺 关键词:adaptive networks ; epidemic dynamics ; network dynamics ; cellular automata ; local-world reconnecting mechanism 机构:College ; College ; Automation ; Nanjing ; University ; Posts ; Telecommunications 年份:2013
    摘要:In the propagation of an epidemic in a population, individuals adaptively adjust their behavior to avoid the risk of an epidemic. Differently from existing studies where new links are established randomly, a local link is established preferentially in this paper. We propose a new preferentially reconnecting edge strategy depending on spatial distance (PR- SD). For the PR-SD strategy, the new link is established at random with probability p and in a shortest distance with the probability 1 p. We establish the epidemic model on an adaptive network using Cellular Automata, and demonstrate the effectiveness of the proposed model by numerical simulations. The results show that the smaller the value of parameter p, the more difficult the epidemic spread is. The PR-SD strategy breaks long-range links and establishes as many short-range links as possible, which causes the network efficiency to decrease quickly and the propagation of the epidemic is restrained effectively.
  • 【期刊】 做“遗传”中学“遗传”

    刊名:中学生物教学 作者:宋玉蓉 关键词:遗传 ; 中学 ; 2009年 ; 教育学院 ; 省教研室 ; 体验活动 ; 科学教学 ; 实验基地 机构:江苏省泰州市教育局教研室 ; 江苏省泰州市教育局教研室 年份:2010
    摘要:2009年10月经江苏省教育学院、江苏省教研室联系,美国普度大学老师来中国农村的实验基地学校进行跨文化的科学教学体验活动。笔者有幸观摩了其中的一堂生物课,感触颇深,现呈现出来与大家共享。
  • 【期刊】 “德”让唐太宗“能”

    刊名:领导科学 作者:宋玉蓉 关键词:“德” 唐太宗 “能” 最高管理者 专制体制 高度集权 封建社会 法律体系 机构:中共广州市委党校公共管理教研部 ; 中共广州市委党校公共管理教研部 年份:2016
    摘要:“德”指内心的仁善修养和外在的惠爱行为。我国封建社会是高度集权的专制体制,人们的法制观念及法律体系很不健全,在这样的环境下,各级管理者特别是最高管理者——皇帝的“德”就成为确保国家健康运行的重要因素。唐太宗之所以能在其统治时期实现政治清明、经济繁荣、人民安居乐业、四海升平、万邦来朝的局面,与他的“德”有密切的关系。
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