随着Internet技术的飞速发展,网络传输中大容量、高速化、多媒体化的需求也在日益增长,网络服务性能一直以来是网络传输中备受关注的问题,因此建立一个接近于实际通信网络的复杂网络仿真模型,对深入研究其网络连接状况及网络性能,拓展...随着Internet技术的飞速发展,网络传输中大容量、高速化、多媒体化的需求也在日益增长,网络服务性能一直以来是网络传输中备受关注的问题,因此建立一个接近于实际通信网络的复杂网络仿真模型,对深入研究其网络连接状况及网络性能,拓展复杂网络理论研究基础和应用领域,具有十分重要的意义.本文在随机图理论的基础上,提出了一种基于随机图的k-叉树网络模型(k-Tree Network Model based on Random-Graph,k-RGN),该网络仿真模型是一种具有链路权重且服从指数分布的随机网络模型.通过在网络仿真模型中的对比实验,验证了k-RGN随机网络模型,在带宽、丢包率、时延、时延抖动、跳数等多参数指标规划中,具有很好的网络综合性能.展开更多
A novel weighted evolving network model based on the clique overlapping growth was proposed.The model shows different network characteristics under two different selection mechanisms that are preferential selection an...A novel weighted evolving network model based on the clique overlapping growth was proposed.The model shows different network characteristics under two different selection mechanisms that are preferential selection and random selection.On the basis of mean-field theory,this model under the two different selection mechanisms was analyzed.The analytic equations of distributions of the number of cliques that a vertex joins and the vertex strength of the model were given.It is proved that both distributions follow the scale-free power-law distribution in preferential selection mechanism and the exponential distribution in random selection mechanism,respectively.The analytic expressions of exponents of corresponding distributions were obtained.The agreement between the simulations and analytical results indicates the validity of the theoretical analysis.Finally,three real transport bus networks(BTNs) of Beijing,Shanghai and Hangzhou in China were studied.By analyzing their network properties,it is discovered that these real BTNs belong to a kind of weighted evolving network model with clique overlapping growth and random selection mechanism that was proposed in this context.展开更多
Two kinds of nickel particles with flower-like struc~＇es assembled with a number of nano-flakes were synthesized and the relationship of their morphology and microwave absorbing properties was studied. The electromag...Two kinds of nickel particles with flower-like struc~＇es assembled with a number of nano-flakes were synthesized and the relationship of their morphology and microwave absorbing properties was studied. The electromagnetic parameters of these flower-like Ni were measured with vector network analyzer at 2-18 GHz frequency and the reflection losses （RL） with different sample thicknesses were calculated. The results indicate that the flower-like nickel-wax composites with the sample thickness less than 2 mm show excellent absorbing ability. This result is expected to play a guiding role in the preparation of the highly efficient absorber.展开更多
文摘随着Internet技术的飞速发展,网络传输中大容量、高速化、多媒体化的需求也在日益增长,网络服务性能一直以来是网络传输中备受关注的问题,因此建立一个接近于实际通信网络的复杂网络仿真模型,对深入研究其网络连接状况及网络性能,拓展复杂网络理论研究基础和应用领域,具有十分重要的意义.本文在随机图理论的基础上,提出了一种基于随机图的k-叉树网络模型(k-Tree Network Model based on Random-Graph,k-RGN),该网络仿真模型是一种具有链路权重且服从指数分布的随机网络模型.通过在网络仿真模型中的对比实验,验证了k-RGN随机网络模型,在带宽、丢包率、时延、时延抖动、跳数等多参数指标规划中,具有很好的网络综合性能.
基金Projects(60874080,60504027) supported by the National Natural Science Foundation of ChinaProject(20060401037) supported by the National Postdoctor Science Foundation of China
文摘A novel weighted evolving network model based on the clique overlapping growth was proposed.The model shows different network characteristics under two different selection mechanisms that are preferential selection and random selection.On the basis of mean-field theory,this model under the two different selection mechanisms was analyzed.The analytic equations of distributions of the number of cliques that a vertex joins and the vertex strength of the model were given.It is proved that both distributions follow the scale-free power-law distribution in preferential selection mechanism and the exponential distribution in random selection mechanism,respectively.The analytic expressions of exponents of corresponding distributions were obtained.The agreement between the simulations and analytical results indicates the validity of the theoretical analysis.Finally,three real transport bus networks(BTNs) of Beijing,Shanghai and Hangzhou in China were studied.By analyzing their network properties,it is discovered that these real BTNs belong to a kind of weighted evolving network model with clique overlapping growth and random selection mechanism that was proposed in this context.
基金Project(JC201006020838A)supported by the Basic Research Funds of Science and Technology Foundation of Shenzhen,China
文摘Two kinds of nickel particles with flower-like struc~＇es assembled with a number of nano-flakes were synthesized and the relationship of their morphology and microwave absorbing properties was studied. The electromagnetic parameters of these flower-like Ni were measured with vector network analyzer at 2-18 GHz frequency and the reflection losses （RL） with different sample thicknesses were calculated. The results indicate that the flower-like nickel-wax composites with the sample thickness less than 2 mm show excellent absorbing ability. This result is expected to play a guiding role in the preparation of the highly efficient absorber.
