Write about the cultural development of the Northern and Southern Dynasties, such as Zhao Ming's literary works, metaphysical and historical attainments, and economic development. Political operation, regime change, factional clan disputes. There is also the reform of Emperor Xiaowen in the North and the unification war of Emperor Taizu in the North, as well as the division of the Northern Wei Dynasty, the establishment of the Northern Qi Dynasty and the Northern Zhou Dynasty, and the influence of the military system in the Northern Zhou Dynasty on the Sui and Tang Dynasties. I am an expert in this field and I hope I can help you.