Table 2. High-frequency keywords of smart elderly care research (frequency ≥15).

No.	Keywords	Frequency		No.	Keywords	Frequency
1	Smart home	239		22	Technology	26
2	Elderly people	162		23	RFID	23
3	Internet of things	156		24	Monitoring	22
4	Ambient assisted living	107		25	Home care	21
5	Elderly care	91		26	Aging in place	21
6	Activity recognition	80		27	Wearable sensors	19
7	Healthcare	69		28	Health monitoring	19
8	Fall detection	63		29	Quality of life	19
9	Machine learning	55		30	Independent living	19
10	e-health	46		31	Remote monitoring	18
11	Assistive technology	43		32	Cloud computing	18
12	Telemedicine	42		33	Smart healthcare	17
13	Ambient intelligence	38		34	Assistive technologies	17
14	Aging	38		35	Activities of daily living	17
15	Dementia	35		36	Big data	17
16	Pervasive computing	34		37	Smart cities	17
17	Artificial intelligence	32		38	Human-robot interaction	17
18	Wireless sensor network	31		39	Privacy	16
19	Deep learning	31		40	Telehealth	16
20	Sensors	30		41	Intelligent systems	15
21	Assisted living	28