By Liapunov reducibility theorem, the periodically time-varying vibration system can be transformed to a linear time-invariant system. Based on the dynamic characteristics of the linear time-invariant system, the mode...By Liapunov reducibility theorem, the periodically time-varying vibration system can be transformed to a linear time-invariant system. Based on the dynamic characteristics of the linear time-invariant system, the mode of the periodically time-varying vibration system has been discussed. The paper defines the mode and analyzes its characteristics. It can be found that the mode of the periodically time-varying system is periodically time-varing but has such characteristics as orthogonality. Finally, a method is given to solve the mode. By solving the eigenvalues and the eigenvectors of the state transition matrix in one period, the periodically time-varying mode can be obtained.展开更多
Sybil攻击通过在网络内伪造多个身份,扰乱网络内节点间的通信,影响了车联网(Vehicular Ad hoc Networks,VANET)性能。为此,提出基于车辆行驶模型的Sybil攻击检测(VehicleDriving Pattern based Sybil Attack Detection,VDP-SAD)算法。VD...Sybil攻击通过在网络内伪造多个身份,扰乱网络内节点间的通信,影响了车联网(Vehicular Ad hoc Networks,VANET)性能。为此,提出基于车辆行驶模型的Sybil攻击检测(VehicleDriving Pattern based Sybil Attack Detection,VDP-SAD)算法。VDP-SAD算法依据Beacon消息为每辆车构建行驶模型矩阵(Driving Pattern Matrix,DPM),再计算DPM的特征值,利用特征值评估车辆行驶模型的相似性,检测Sybil攻击节点。仿真结果表明,VDP-SAD算法具有较高的检测率。展开更多
文摘By Liapunov reducibility theorem, the periodically time-varying vibration system can be transformed to a linear time-invariant system. Based on the dynamic characteristics of the linear time-invariant system, the mode of the periodically time-varying vibration system has been discussed. The paper defines the mode and analyzes its characteristics. It can be found that the mode of the periodically time-varying system is periodically time-varing but has such characteristics as orthogonality. Finally, a method is given to solve the mode. By solving the eigenvalues and the eigenvectors of the state transition matrix in one period, the periodically time-varying mode can be obtained.
文摘Sybil攻击通过在网络内伪造多个身份,扰乱网络内节点间的通信,影响了车联网(Vehicular Ad hoc Networks,VANET)性能。为此,提出基于车辆行驶模型的Sybil攻击检测(VehicleDriving Pattern based Sybil Attack Detection,VDP-SAD)算法。VDP-SAD算法依据Beacon消息为每辆车构建行驶模型矩阵(Driving Pattern Matrix,DPM),再计算DPM的特征值,利用特征值评估车辆行驶模型的相似性,检测Sybil攻击节点。仿真结果表明,VDP-SAD算法具有较高的检测率。
