基于延长W SN 生命周期的LEACH 算法的改进

Energy maintenance of wireless sensor network nodes is not easy to achieve, so energy saving is one of the main consider- ations in network design. Based on the study of hierarchical cluster-head LEACH algorithm, an improved algorithm—NLEACH al- gorithm is proposed. K times of the ratio between the residual energy of the node and the total energy of the system is introduced as the residual energy factor in the threshold calculation, which affects the change of cluster head number and network life cycle. In ad- dition, for nodes with different residual energy, nodes with more residual energy can act as cluster heads with high probability, in or- der to take advantage of the energy of each node. Through MATLAB simulation experiment, the results show that compared with LEACH algorithm, NLEACH algorithm prolongs the network life cycle and increases the data transmission volume.     

扭曲椭圆高斯谢尔模光束的自修复特性

基于Collins公式推导了扭曲椭圆高斯谢尔模光束在经过高斯吸收型障碍物后传输的场分布解析表达式，得到了一种有效增强光束自修复能力的基础扭曲光束模型，分析了光源各参数对光束自修复特性的影响，揭示了光束强度、相干度和轨道角动量通量密度在被障碍物部分遮挡后传输的规律以及三者之间的内在联系，解释了扭曲光束自修复特性的内在原理。研究表明，适当减小相干长度和扭曲因子可以在保留扭曲光束特性的同时增强光束的自修复能力。该研究结论有助于优化部分相干光在自由空间传输的整体性能，在自由空间光通信、激光雷达、遥感成像等领域具有潜在的应用价值。