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It also helps people make healthcare judgments and disease predictions when combined with big data technology. However, traditional methods for recognition of human daily activities based on vision and multisensors have limitations due to poor portability and weak capability in multiple activities detection. Herein, the development of a wearable human activity recognition (HAR) smart ring capable of recognizing at least 20 multi\u2010intensity activities, i.e., motions ranging from clean\u2010the\u2010desk to playing basketball, based on a microinertial measurement unit and a hierarchical decision algorithm is proposed. Users only need to wear the smart ring on the index finger of the right hand to accurately identify 20 common activities that are classified as light, vigorous, and fierce. A novel hierarchical decision algorithm using 70 features is proposed to improve the accuracy and speed of recognizing common human activities and provides a final recognition accuracy of 98.10% for 20 types of activities. This extremely portable, reliable, and high\u2010accuracy HAR solution is a significant advancement in providing real\u2010time quantitative data for personal lifestyle supervision, time planning, and healthcare management.<\/jats:p><\/jats:sec>","DOI":"10.1002\/aisy.202200204","type":"journal-article","created":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T06:06:45Z","timestamp":1666764405000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A Single Smart Ring for Monitoring 20 Kinds of Multi\u2010Intensity Daily Activities\u2013\u2013From Kitchen Work to Fierce Exercises"],"prefix":"10.1002","volume":"4","author":[{"given":"Yuliang","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Information Science and Engineering Northeastern University  Shenyang 110819 China"},{"name":"Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology  Qinhuangdao 066004 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiali","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering Northeastern University  Shenyang 110819 China"},{"name":"Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology  Qinhuangdao 066004 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1919-3063","authenticated-orcid":false,"given":"Chao","family":"Lian","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering Northeastern University  Shenyang 110819 China"},{"name":"Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology  Qinhuangdao 066004 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yifan","family":"Liu","sequence":"additional","affiliation":[{"name":"CAS-CityU Joint Laboratory for Robotic Research City University of Hong Kong  Hongkong, Hong Kong SAR 999077 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xianshou","family":"Ren","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering Northeastern University  Shenyang 110819 China"},{"name":"Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology  Qinhuangdao 066004 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8484-6668","authenticated-orcid":false,"given":"Jiazhi","family":"Lou","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Xiamen University  Xiamen 361000 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meng","family":"Chen","sequence":"additional","affiliation":[{"name":"CAS-CityU Joint Laboratory for Robotic Research City University of Hong Kong  Hongkong, Hong Kong SAR 999077 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wen Jung","family":"Li","sequence":"additional","affiliation":[{"name":"CAS-CityU Joint Laboratory for Robotic Research City University of Hong Kong  Hongkong, Hong Kong SAR 999077 China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,10,26]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2021.3058998"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2018.2837347"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2020.2991891"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/TBME.2014.2307069"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2019.2962803"},{"key":"e_1_2_9_7_1","first-page":"107560","volume":"7","author":"Dhiman C.","year":"2019","journal-title":"Eng. 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