Coarse-to-Fine Activity Annotation and Recognition Algorithm for Solitary Older Adults. - Xin Hu 010; Dianhui Chu; Zhengzuo Li; Ruixuan Dai; Yang Cui 003; Zhiyuan Zhou; Boyang An; Yongqing Han; Chunmao Jiang; Deqiong Ding (IEEE Access, 2020)