A novel snowdrift game model with edge weighting mechanism on the square lattice

We propose a novel snowdrift game model with edge weighting mechanism to explore the cooperative behaviors among the players on the square lattice. Based on the assumption of three types of weight distribution including uniform, exponential and power-law schemes, the cooperation level is largely boosted in contrast with the traditional snowdrift game on the unweighted square lattice. Extensive numerical simulations indicate that the fraction of cooperators greatly augments, especially for the intermediate range of cost-to-benefit ratio r. Furthermore, we investigate how the cooperative behaviors are affected by the undulation amplitude of weight distribution and noise strength of strategy selection, respectively. The simulation results will be conducive to further understanding and analyzing the emergence of cooperation, which is a ubiquitous phenomenon in social and biological science.     

Java Applet在网络实验中的应用

在计算机网络课程的教学过程中，实验是加强学生对基本理论理解的一个重要手段．本文以网络中Go-Back-N（后退N帧）实验为例，介绍了如何应用Java Applet制作网络课程中交互性实验的详细过程．     

基于虚拟仪器的网络化测试技术研究

随着仪器技术与计算机技术的发展,从20世纪80年代中期开始,美国国家仪器公司(National In-struments:NI)提出了虚拟仪器[1-3]的概念,并开发出以通用计算机为中坚的开发平台,目前虚拟仪器技术已逐步为科学界和工程界所认可并应用在各个领域.本文以温湿度为测量对象,实现了基于虚     

C＋＋中虚函数的实现机制

介绍了C 编程语言中的虚函数及其在进行面向对象程序设计中重要性，并且详细阐述了它在编译器底层虚函数的实现机制．它通过一个vptr和vtable在运行时进行动态绑定，从而能够根据对象类型的不同调用不同的虚函数；并通过实例测试验证了上述机制、     

HL-1M装置超声分子束流注入过程中的团簇现象

在ＨＬ－１Ｍ装置上最近改进后的超声分子束流加料实验中,发现边缘等离子体的Ｈａ线辐射信号沿大环方向同有序变化。在超声分子束注入口附近区域,Ｈａ信号为长方形正脉冲,类似于分子束注入脉冲,而在远离注入口区域的边缘Ｈａ信号为负尖脉冲。在注入口附近区域,用静电探针测得的径向电子温度和密度在超声分子束注入期间分别下降和上升了一个数量级。ＣＣＤ相机拍摄分子束与等离子体相互作用产生的Ｈａ线辐射强度分布等实验结果表     

基于EEG数值计算的头部MRI图像处理

现在,对于脑科学的研究,无论是从微观还是宏观层次,脑成像都是其有力的工具.脑成像不仅是指大脑解剖结构成像,更重要的是脑功能成像,即结合图像来分析脑的功能活动(生理、病理、感知或认知的),从而揭示脑功能的奥秘.在过去的十几年中,对脑活动非损伤宏观成像技术取得了很大的发     

基于PC机的数据通信模拟实验系统设计

介绍数据通信模拟实验系统开发的原理、算法与技术．实验系统采用Microsoft Visual C＋＋6．0开发，提供编译码、流量控制、差错控制、多路复用技术和频带传输与调制解调技术等实验的动态演示．     

Effect of Growing Size of Interaction Neighbors on the Evolution of Cooperation in Spatial Snowdrift Game

In this paper,we study the influence of the size of interaction neighbors(k) on the evolution of cooperation in the spatial snowdrift game.At first,we consider the effects of noise K and cost-to-benefit ratio r,the simulation results indicate that the evolution of cooperation depends on the combined action of noise and cost-to-benefit ratio.For a lower r,the cooperators are multitudinous and the cooperation frequency ultimately increases to 1 as the increase of noise.However,for a higher r,the defectors account for the majority of the game and dominate the game if the noise is large enough.Then we mainly investigate how k influences the evolution of cooperation by varying the noise in detail.We find that the frequency of cooperators is closely related to the size of neighborhood and cost-to-benefit ratio r.In the case of lower r,the augmentation of k plays no positive role in promoting the cooperation as compared with that of k = 4,while for higher r the cooperation is improved for a growing size of neighborhood.At last,based on the above discussions,we explore the cluster-forming mechanism among the cooperators.The current results are beneficial to further understand the evolution of cooperation in many natural,social and biological systems.     

新颖的网络病毒传播SIRC模型

从计算机网络中节点感染和防御病毒的实际过程出发,提出了一种带有修复状态的计算机网络病毒传播模型,将感染后经过处理的节点划分为修复状态和免疫状态,通过微分方程组求解模型的稳态解,然后通过MATLAB仿真模拟分析理论值与仿真值的差别,校正所提出的模型.结果表明:该模型中感染率存在一个阈值,感染率小于阈值时,所有网络节点最终将被治愈,病毒消亡;反之病毒爆发.因此,控制感染率小于临界值将有利于抑制病毒的爆发.论文研究的结果有助于制定更加有利于抵制病毒传播的策略,维护网络的信息安全.