Age of Information Minimization for UAV-Assisted Internet of Things Networks: A Safe Actor-Critic With Policy Distillation Approach. - Fang Fu; Xianpeng Wei; Zhicai Zhang; Laurence T. Yang; Lin Cai 001; Jia Luo 003; Zhe Zhang 010; Chenmeng Wang (IEEE Trans. Netw. Sci. Eng., 2024)