基于多智能体航空公司航班恢复协同决策方法

航空公司进行航班延误恢复时，各种资源之间会通过航班计划产生间接关联，此时各决策单元若独立地考虑本领域内的资源恢复问题，将难以保证恢复方案的整体可行性和全局优化性。为探究航空公司航班恢复过程中各决策部门的决策模型及其协同关系，本文提出了基于多智能体技术的航班恢复协同决策仿真方法。首先，基于航空公司实际组织架构构建了航班恢复多智能体决策系统框架；其次，对部门间协同决策的动态过程进行了分析，将延误恢复的全过程分为了预恢复、可行解协商、均衡解协商3个阶段，构建了三阶段协同决策机制；最后，根据不同资源的恢复特性建立各决策部门的核心决策模型与部门间自动协商模型，并基于多智能体系统进行仿真。仿真结果显示，基于多智能体的协同决策方法能够在3.8 s的极短时间内针对1天中包含3架飞机和12个航班的航班计划做出完整的延误恢复方案，并且能够在保障航空公司整体效益的情况下一定程度地平衡各决策主体的自身利益。     

基于乘性加扰的卫星信号遮蔽传输方案

针对卫星发送功率受限的情况，提出了一种卫星信号遮蔽传输的新方案。在卫星上，通过将待传输的业务信号与特别设计的非恒包络遮蔽信号相乘，隐藏了原业务信号的时频域特征。在授权地面站，利用遮蔽信号副本进行互相关时延估计并解遮蔽，从而恢复原业务信号。该方案具有不增加卫星的传输功耗、星上遮蔽运算复杂度低、传输安全性强等特点。此外，通过处理损耗、互信息等定量评价指标，分析了遮蔽方案的遮蔽性能。仿真实验表明，该遮蔽方案可以实现良好的时频域遮蔽效果。遮蔽后信号与原业务信号间的互信息结果表明：遮蔽后信号与原业务信号间相关性很弱，已基本掩盖原业务信号通信特征。在遮蔽信号与原业务信号带宽之比不小于0.3、信噪比不小于–4 dB的条件下，授权地面站解遮蔽的处理损耗可以控制在1 dB以内，具有良好的实用价值。     

具有欺骗攻击的主从神经网络混合 事件触发同步控制

文章提出了一种针对受到欺骗攻击的主从神经网络的混合事件触发同步控制方法。所提出的方法采用以伯努利分布为特征的混合事件触发方案，通过仅在必要时传输数据来减轻通信负担并处理不可预测的网络环境。记忆事件触发机制可以在系统响应状态的峰值和低谷期间传输更多的数据。通过考虑实际情况中的不确定性，将网络诱导时滞和随机发生的欺骗攻击纳入一个统一的框架，并构建了相应的李雅普诺夫泛函。其次，使用李雅普诺夫理论，推导出一个稳定性判据。最后，通过数值算例验证了所提出方法的有效性。     

A geographical and operational deep graph convolutional approach for flight delay prediction

Flight delay prediction has attracted great interest in civil aviation community due to its significant role in airline planning, flight scheduling, airport operation, and passenger service. Flight delay is affected by numerous factors and irregularly propagates in air transportation networks owing to flight connectivity, which brings critical challenges to accurate flight delay prediction. In recent years, Graph Convolutional Networks (GCNs) have become popular in flight delay prediction due to the advantage in extracting complicated relationships. However, most of the existing GCN-based methods have failed to effectively capture the spatial–temporal information in flight delay prediction. In this paper, a Geographical and Operational Graph Convolutional Network (GOGCN) is proposed for multi-airport flight delay prediction. The GOGCN is a GCN-based spatial–temporal model that improves node feature representation ability with geographical and operational spatial–temporal interactions in a graph. Specifically, an operational aggregator is designed to extract global operational information based on the graph structure, while a geographical aggregator is developed to capture the similar nature among spatially close airports. Extensive experiments on a real-world dataset demonstrate that the proposed approach outperforms the state-of-the-art methods with a satisfying accuracy improvement.