中阁补算将学會通沁第17卷第2期2021年2月 Technologies,2018,2(4):1-21 [9]Guo J,ct al.Twinleak:Rfid-based liquid leakage detcction in industrial environments.IEEE INFOCOM 2019-IEEE Conference on Computer Communications,2019:883-91 [20]Wang C.et al.Multi-touch in the air:Device-free finger tracking and gesture recognition via cots rfid.IEEE INFOCOM 2018-IEEE Conference on Computer Communications,2018:1691-9 1]Liu J,et al.Tagsheet:Sleeping posture recognition with an unobtrusive passive tag matrix.IEEE INFOCOM 2019. IEEE Conference on Computer Communications,2019: 874-82 22]Wang Y and Zheng Y.Modeling RFID signal reflection for contact-free activity recognition.Proceedings of the ACM on Interactive,Mobile,Wearable and Ubiquitous Technologies,2018,2(4):1-22 [23]Wang C,et al.Rf-ecg:Heart rate variability assessment based on cots rfid tag array.Proceedings of the ACM on Interactive,Mobile,Wearable and Ubiquitous Technologies,2018,2(2):1-26 2727 第 17 卷  第 2 期  2021 年 2 月 更多参考文献：http://dl.ccf.org.cn/cccf/list Technologies, 2018, 2(4): 1-21 [19] Guo J, et al. Twinleak: Rfid-based liquid leakage detection in industrial environments. IEEE INFOCOM 2019-IEEE Conference on Computer Communications, 2019: 883-91 [20] Wang C, et al. Multi-touch in the air: Device-free finger tracking and gesture recognition via cots rfid. IEEE INFOCOM 2018-IEEE Conference on Computer Communications, 2018: 1691-9 [21] Liu J, et al. Tagsheet: Sleeping posture recognition with an unobtrusive passive tag matrix. IEEE INFOCOM 2019- IEEE Conference on Computer Communications, 2019: 874-82 [22] Wang Y and Zheng Y. Modeling RFID signal reflection for contact-free activity recognition. Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies, 2018, 2(4): 1-22 [23] Wang C, et al. Rf-ecg: Heart rate variability assessment based on cots rfid tag array. Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies, 2018, 2(2): 1-26