Design of a smart doorbell for a leader’s office with availability status notification and visitor recognition features by Khac-Nguyen Nguyen, Chanh-Nghiem Nguyen, Huu-Danh Bui, Minh-Tuong Tran, Chanh-Nghia Lam, Quoc Bao Truong, Hoang Dung Nguyen, Chi Ngon Nguyen

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