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However, recently developed wearable strain sensors exhibit several limitations. For example, when a sensor is designed with high sensitivity\u00a0to detect strain, it struggles to accurately measuring the deformation of low\u2010stiffness materials like skin. Additionally, finding the optimal balance between sensitivity, durability, hysteresis, and strain range in sensor design is challenging. To address these challenges, a Buckled, Ultrasoft, Crack\u2010based, Large strain, EpiDermal (BUCKLED) sensor is developed. This sensor integrates the benefits of soft structure engineering with high sensitivity of crack\u2010based sensing mechanisms to ensure optimal skin deformation measurements. The BUCKLED sensor exhibits significant improvements in compliance (18\u2009500\u2009mm\u2009N<jats:sup>\u22121<\/jats:sup>), stretchability (100%), hysteresis (2%), durability (10\u2009000 cycles with 100% strain), and force sensitivity () owing to its buckled shape, confirming its ability to detect subtle movements with enhanced accuracy. The sensor's high compliance allows it to accurately measure low\u2010stiffness objects, ensuring reliable performance. Furthermore, the sensor's tunability is demonstrating its effectiveness in applications such as respiratory monitoring, facial expression recognition, and silent speech interfaces. Consequently, the proposed sensor is versatile and holds great potential for a wide range of sensing applications.<\/jats:p>","DOI":"10.1002\/aisy.202400624","type":"journal-article","created":{"date-parts":[[2024,10,14]],"date-time":"2024-10-14T01:40:36Z","timestamp":1728870036000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Ultrasensitive Ultrasoft Buckled Crack\u2010Based Sensor for Respiration Measurement and Enhanced Human\u2013Machine Interface"],"prefix":"10.1002","volume":"7","author":[{"given":"Jingoo","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"},{"name":"Department of Urban Environment Research Korea Institute of Machinery &amp; Materials  Daejeon 34103 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taewi","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"},{"name":"Department of Psychiatry, School of Medicine Ajou University  Suwon 16499 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyeongseok","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sunghoon","family":"Im","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jieun","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Inyong","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Urban Environment Research Korea Institute of Machinery &amp; Materials  Daejeon 34103 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dae Hoon","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Urban Environment Research Korea Institute of Machinery &amp; Materials  Daejeon 34103 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bangwoo","family":"Han","sequence":"additional","affiliation":[{"name":"Department of Urban Environment Research Korea Institute of Machinery &amp; Materials  Daejeon 34103 Republic of Korea"},{"name":"Mechanical Engineering University of Science and Technology (UST)  Daejeon 34113 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7490-9079","authenticated-orcid":false,"given":"Daeshik","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Ajou University  Suwon 16499 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3800-2346","authenticated-orcid":false,"given":"Gunhee","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Urban Environment Research Korea Institute of Machinery &amp; Materials  Daejeon 34103 Republic of Korea"},{"name":"Mechanical Engineering University of Science and Technology (UST)  Daejeon 34113 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,10,13]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"crossref","unstructured":"D.Gorecky M.Schmitt M.Loskyll D.Z\u00fchlke in2014 12th IEEE Int. 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