一类非线性周期振荡电路的分岔和混沌控制

Bifurcation and Chaos Control in a Class of Nonlinear Electrical Oscillator

基于基尔霍夫第一定律(KCL)建立了一类非线性周期振荡电路的数学模型,分析了周期激振力变化时对系统动力学行为的影响.通过计算Duffing系统时间序列的Lyapunov指数谱验证了对称性破缺分岔是倍周期分岔的前兆.通过仿真系统的分岔图、Lyapunov指数谱和利用Kaplan-Yorke猜想公式计算系统吸引子的Lyapunov维数,刻画出系统的周期运动和混沌运动,揭示了此类系统通向混沌的过程.最后,应用一种有效而又简易的控制方法对此类非线性电路中的混沌运动进行了控制.

Security is the main problem in enterprise information systems. We can address the problem by using both of PKI and PMI, but there is no practical scheme of using PKI and PMI special for information systems yet. Based on the analysis of the characteristics of PKI, PMI and RBAC, An application scheme of access control using PKI and PMI in enterprise information systems is brought forward. The access control model is analyzed and designed. The procedure of implementing the security system is depicted and corresponding instance is also presented.