传统随机游走链接预测算法基于复杂网络局部拓扑路径建立,没有考虑不同类型网络的生成机制。针对该问题,引入衡量随机游走效率的重要统计指标-平均首到达时间(mean first passing time,MFPT),提出一种可扩展的链接预测算法。该算法结合...传统随机游走链接预测算法基于复杂网络局部拓扑路径建立,没有考虑不同类型网络的生成机制。针对该问题,引入衡量随机游走效率的重要统计指标-平均首到达时间(mean first passing time,MFPT),提出一种可扩展的链接预测算法。该算法结合图谱理论,计算每个目标节点从其余节点到该节点的MFPT,以基于互信息度量节点影响的偏好随机游走算法(mutual information random walk,MIRW)为例,把MFPT信息嵌入到跳转概率定义中并拓展到加权网络链接预测场景。在生成的仿真网络数据和真实网络中的实证结果表明,该文算法能够提升基准随机游走算法的预测性能,并具备很好的扩展性。展开更多
A novel image encryption method based on the random sequence generated from the generalized information domain and permutation–diffusion architecture is proposed. The random sequence is generated by reconstruction fr...A novel image encryption method based on the random sequence generated from the generalized information domain and permutation–diffusion architecture is proposed. The random sequence is generated by reconstruction from the generalized information file and discrete trajectory extraction from the data stream. The trajectory address sequence is used to generate a P-box to shuffle the plain image while random sequences are treated as keystreams. A new factor called drift factor is employed to accelerate and enhance the performance of the random sequence generator. An initial value is introduced to make the encryption method an approximately one-time pad. Experimental results show that the random sequences pass the NIST statistical test with a high ratio and extensive analysis demonstrates that the new encryption scheme has superior security.展开更多
文摘传统随机游走链接预测算法基于复杂网络局部拓扑路径建立,没有考虑不同类型网络的生成机制。针对该问题,引入衡量随机游走效率的重要统计指标-平均首到达时间(mean first passing time,MFPT),提出一种可扩展的链接预测算法。该算法结合图谱理论,计算每个目标节点从其余节点到该节点的MFPT,以基于互信息度量节点影响的偏好随机游走算法(mutual information random walk,MIRW)为例,把MFPT信息嵌入到跳转概率定义中并拓展到加权网络链接预测场景。在生成的仿真网络数据和真实网络中的实证结果表明,该文算法能够提升基准随机游走算法的预测性能,并具备很好的扩展性。
文摘A novel image encryption method based on the random sequence generated from the generalized information domain and permutation–diffusion architecture is proposed. The random sequence is generated by reconstruction from the generalized information file and discrete trajectory extraction from the data stream. The trajectory address sequence is used to generate a P-box to shuffle the plain image while random sequences are treated as keystreams. A new factor called drift factor is employed to accelerate and enhance the performance of the random sequence generator. An initial value is introduced to make the encryption method an approximately one-time pad. Experimental results show that the random sequences pass the NIST statistical test with a high ratio and extensive analysis demonstrates that the new encryption scheme has superior security.
