针对一维光子晶体制备过程中无序效应的引入问题,基于Look and Say数列与一维光子晶体结构构造了一种一维Look and Say序列分形结构光子晶体,仿真实现了在介质折射率与介质层厚度中引入适当无序效应对该种晶体反射图谱的影响分析。仿真...针对一维光子晶体制备过程中无序效应的引入问题,基于Look and Say数列与一维光子晶体结构构造了一种一维Look and Say序列分形结构光子晶体,仿真实现了在介质折射率与介质层厚度中引入适当无序效应对该种晶体反射图谱的影响分析。仿真表明:在介质折射率中引入适当高度无序效应、在介质层厚度中引入适当低度无序效应可以使得该种晶体的反射图谱获得较宽的高反射率频带,为部分光学器件反射性能的提高提供了参考依据。所提出分形光子晶体的反射和透射特性调控方法应用于实验教学后,可使学生更直观地理解复杂的理论知识,有效提升学生的动手操作能力、数据分析能力和解决实际工程问题的能力。展开更多
Artificial intelligence(AI)was a hot topic at this year’s annual meetings of the National People’s Congress and the National Committee of the Chinese People’s Political Consultative Conference,also referred to as t...Artificial intelligence(AI)was a hot topic at this year’s annual meetings of the National People’s Congress and the National Committee of the Chinese People’s Political Consultative Conference,also referred to as the Two Sessions.The recently released AI chatbot DeepSeek has quickly gained global attention and users with its rich features.展开更多
研究多站点传送带给料生产加工站(Conveyor-serviced production station,CSPS)系统的最优控制问题,其优化目标是通过合理选择每个CSPS的Look-ahead控制策略,实现整个系统的工件处理率最大.本文首先根据多Agent系统的反应扩散思想,对每...研究多站点传送带给料生产加工站(Conveyor-serviced production station,CSPS)系统的最优控制问题,其优化目标是通过合理选择每个CSPS的Look-ahead控制策略,实现整个系统的工件处理率最大.本文首先根据多Agent系统的反应扩散思想,对每个Agent的原始性能函数进行改进,引入了具有扩散功能的局域信息交互项(原始项看作具有反应功能);并运用性能势理论,构建一种适用于平均和折扣两种性能准则的Wolf-PHC多Agent学习算法,以求解决策时刻不同步的多站点的协作Look-ahead控制策略.最后,论文通过仿真实验验证了该算法的有效性,学习结果表明,通过性能函数的改进,各工作站的负载平衡性得到改善,整个系统的工件处理率也明显提高.展开更多
In the framework of an overlapping generations model, forward-looking monetary policy roles and backward-looking monetary policy rules were investigated. It is shown that the monetary steady state is more likely to be...In the framework of an overlapping generations model, forward-looking monetary policy roles and backward-looking monetary policy rules were investigated. It is shown that the monetary steady state is more likely to be indeterminate under an active forwardlooking rule than under the corresponding backward-looking rule. It is also shown that backward-looking roles can render the monetary steady state unstable.展开更多
针对基于You Only Look Once v2算法的目标检测存在精度低及稳健性差的问题,提出一种车辆目标实时检测的You Only Look Once v2优化算法;该算法以You Only Look Once v2算法为基础,通过增加网络深度,增强特征提取能力,同时,通过添加残...针对基于You Only Look Once v2算法的目标检测存在精度低及稳健性差的问题,提出一种车辆目标实时检测的You Only Look Once v2优化算法;该算法以You Only Look Once v2算法为基础,通过增加网络深度,增强特征提取能力,同时,通过添加残差模块,解决网络深度增加带来的梯度消失或弥散问题;该方法将网络结构中低层特征与高层特征进行融合,提升对小目标车辆的检测精度。结果表明,通过在KITTI数据集上进行测试,优化后的算法在检测速度不变的情况下,提高了车辆目标检测精度,平均精度达到0.94,同时提升了小目标检测的准确性。展开更多
文摘针对一维光子晶体制备过程中无序效应的引入问题,基于Look and Say数列与一维光子晶体结构构造了一种一维Look and Say序列分形结构光子晶体,仿真实现了在介质折射率与介质层厚度中引入适当无序效应对该种晶体反射图谱的影响分析。仿真表明:在介质折射率中引入适当高度无序效应、在介质层厚度中引入适当低度无序效应可以使得该种晶体的反射图谱获得较宽的高反射率频带,为部分光学器件反射性能的提高提供了参考依据。所提出分形光子晶体的反射和透射特性调控方法应用于实验教学后,可使学生更直观地理解复杂的理论知识,有效提升学生的动手操作能力、数据分析能力和解决实际工程问题的能力。
文摘Artificial intelligence(AI)was a hot topic at this year’s annual meetings of the National People’s Congress and the National Committee of the Chinese People’s Political Consultative Conference,also referred to as the Two Sessions.The recently released AI chatbot DeepSeek has quickly gained global attention and users with its rich features.
文摘研究多站点传送带给料生产加工站(Conveyor-serviced production station,CSPS)系统的最优控制问题,其优化目标是通过合理选择每个CSPS的Look-ahead控制策略,实现整个系统的工件处理率最大.本文首先根据多Agent系统的反应扩散思想,对每个Agent的原始性能函数进行改进,引入了具有扩散功能的局域信息交互项(原始项看作具有反应功能);并运用性能势理论,构建一种适用于平均和折扣两种性能准则的Wolf-PHC多Agent学习算法,以求解决策时刻不同步的多站点的协作Look-ahead控制策略.最后,论文通过仿真实验验证了该算法的有效性,学习结果表明,通过性能函数的改进,各工作站的负载平衡性得到改善,整个系统的工件处理率也明显提高.
基金Project supported by National Natural Science Foundation of China （Grant No. 70071012）
文摘In the framework of an overlapping generations model, forward-looking monetary policy roles and backward-looking monetary policy rules were investigated. It is shown that the monetary steady state is more likely to be indeterminate under an active forwardlooking rule than under the corresponding backward-looking rule. It is also shown that backward-looking roles can render the monetary steady state unstable.
文摘针对基于You Only Look Once v2算法的目标检测存在精度低及稳健性差的问题,提出一种车辆目标实时检测的You Only Look Once v2优化算法;该算法以You Only Look Once v2算法为基础,通过增加网络深度,增强特征提取能力,同时,通过添加残差模块,解决网络深度增加带来的梯度消失或弥散问题;该方法将网络结构中低层特征与高层特征进行融合,提升对小目标车辆的检测精度。结果表明,通过在KITTI数据集上进行测试,优化后的算法在检测速度不变的情况下,提高了车辆目标检测精度,平均精度达到0.94,同时提升了小目标检测的准确性。
