针对传统最大似然波达方向(maximum likelihood direction of arrival,ML-DOA)估计存在计算量大、估计精度差等问题,本文提出一种采用改进帝王蝶优化算法(improved monarch butterfly optimization algorithm,IMBO)的ML-DOA估计方法。I...针对传统最大似然波达方向(maximum likelihood direction of arrival,ML-DOA)估计存在计算量大、估计精度差等问题,本文提出一种采用改进帝王蝶优化算法(improved monarch butterfly optimization algorithm,IMBO)的ML-DOA估计方法。IMBO算法通过精英反向学习策略对初始帝王蝶种群进行优化,得到适应度值较优的初始帝王蝶个体,进而能够改善帝王蝶种群的多样性;引入差分进化算法启发的变异操作以及自适应策略对帝王蝶个体的寻优方式进行改进,扩大了算法的搜索空间;引入了高斯-柯西变异算子,自适应调整变异步长,避免算法陷入局部最优。将IMBO应用于ML-DOA,实验表明,与传统的DOA估计算法相比,在不同信源数目、信噪比以及种群数量下,本文提出的算法收敛性能更好,均方根误差更低,运算量更小。展开更多
古罗马作家苏维托尼乌斯的《罗马十二帝王传》记录了从恺撒到图密善之间的最初12个元首的生平事迹。罗马皇帝图密善的传记是《罗马十二帝王传》的最后一篇。图密善长久以来一直被冠以暴君的称呼,然而在苏维托尼乌斯的笔下图密善不仅仅...古罗马作家苏维托尼乌斯的《罗马十二帝王传》记录了从恺撒到图密善之间的最初12个元首的生平事迹。罗马皇帝图密善的传记是《罗马十二帝王传》的最后一篇。图密善长久以来一直被冠以暴君的称呼,然而在苏维托尼乌斯的笔下图密善不仅仅具有残暴的一面,还具有慷慨、公正、热心的另一面形象;图密善的傲慢也许并非只是他自身的妄自尊大,与他的早年经历和统治也有关联。分析《罗马十二帝王传》中图密善的多面形象,有助于能够还原出一位更贴近真实的历史人物形象。De Vita Caesarum by the ancient Roman writer Suetonius records the life stories of the first twelve heads of state from Caesar to Domitian. The biography of Roman Emperor Domitian is the final chapter of it. Domitian has long been referred to as a tyrant, but in the writings of Suetonius, he not only has a cruel side, but also has another image of generosity, justice, and enthusiasm;Domitian’s arrogance may not only be his own arrogance, but also related to his early experiences and rule. Analyzing the multifaceted image of Domitian in Suetonius’ work can help to reconstruct a more realistic historical figure.展开更多
In Vietnam,the ancient emperor literature was a very outstanding literary group.The Vietnamese ancient emperors wrote a lot of poems and works.They wrote mainly in Chinese characters.and had made great achievement.The...In Vietnam,the ancient emperor literature was a very outstanding literary group.The Vietnamese ancient emperors wrote a lot of poems and works.They wrote mainly in Chinese characters.and had made great achievement.The ancient emperor literature occupied a definite position in the classical literature history of Vietnam.展开更多
文摘针对传统最大似然波达方向(maximum likelihood direction of arrival,ML-DOA)估计存在计算量大、估计精度差等问题,本文提出一种采用改进帝王蝶优化算法(improved monarch butterfly optimization algorithm,IMBO)的ML-DOA估计方法。IMBO算法通过精英反向学习策略对初始帝王蝶种群进行优化,得到适应度值较优的初始帝王蝶个体,进而能够改善帝王蝶种群的多样性;引入差分进化算法启发的变异操作以及自适应策略对帝王蝶个体的寻优方式进行改进,扩大了算法的搜索空间;引入了高斯-柯西变异算子,自适应调整变异步长,避免算法陷入局部最优。将IMBO应用于ML-DOA,实验表明,与传统的DOA估计算法相比,在不同信源数目、信噪比以及种群数量下,本文提出的算法收敛性能更好,均方根误差更低,运算量更小。
文摘古罗马作家苏维托尼乌斯的《罗马十二帝王传》记录了从恺撒到图密善之间的最初12个元首的生平事迹。罗马皇帝图密善的传记是《罗马十二帝王传》的最后一篇。图密善长久以来一直被冠以暴君的称呼,然而在苏维托尼乌斯的笔下图密善不仅仅具有残暴的一面,还具有慷慨、公正、热心的另一面形象;图密善的傲慢也许并非只是他自身的妄自尊大,与他的早年经历和统治也有关联。分析《罗马十二帝王传》中图密善的多面形象,有助于能够还原出一位更贴近真实的历史人物形象。De Vita Caesarum by the ancient Roman writer Suetonius records the life stories of the first twelve heads of state from Caesar to Domitian. The biography of Roman Emperor Domitian is the final chapter of it. Domitian has long been referred to as a tyrant, but in the writings of Suetonius, he not only has a cruel side, but also has another image of generosity, justice, and enthusiasm;Domitian’s arrogance may not only be his own arrogance, but also related to his early experiences and rule. Analyzing the multifaceted image of Domitian in Suetonius’ work can help to reconstruct a more realistic historical figure.
文摘In Vietnam,the ancient emperor literature was a very outstanding literary group.The Vietnamese ancient emperors wrote a lot of poems and works.They wrote mainly in Chinese characters.and had made great achievement.The ancient emperor literature occupied a definite position in the classical literature history of Vietnam.
