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Pre-strain과 sensor extending을 활용한 미소 변형에서 높은 민감도를 갖는 변형 센서 제작
Hyun Suk Jung(정현석),Chan Park(박찬),Hyun Woo Lee(이현우),Seong Uk Hong(홍성욱),Hyong Uk Kim(김형욱),Cheol Jeong Park(박철정),Seong Kyung Hong(홍성경),Seong Jin Cho(조성진) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Measuring pulse wave technology has received great attention because it indicates the status of the heart and blood vessels. For measuring precise pulse wave, high sensitivity (gauge factor〉500) at low deformation (〈1% strain) and repeatability are necessary. Because a pulse of blood causes micro-scale deformation of skin, high sensitivity sensor is required to measure the small deformation. However, other studies are low sensitivity under 1% strain and poor hysteresis that makes unreliable repeatability. Here, we fabricated a crack-based strain sensor that has high sensitivity (Gauge Factor〉2,000) at low strain (〈1% strain) with pre-strain (P.S) and sensor extending (S.E) process. We can also control sensitivity and linearity through P.S and S.E as needs.
자외선 차단 코팅을 위한 나노섬유 멤브레인 및 휴대용 전기방사 시스템 개발
이현우(Hyunwoo Lee),홍성욱(Sunguk Hong),박찬(Chan Park),정현석(Hyunsuk Jung),김형욱(Hyonguk Kim),박철정(Cheol Jeong Park),홍성경(Seong Kyung Hong),조성진(Seong J. Cho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
As the harmfulness of ultraviolet(UV) rays is widely known, it has become important to protect the skin from ultraviolet rays. However, current sunscreens have the disadvantages of promoting skin disorders due to chemical composition, and short duration. Here, we introduce a novel portable electrospinning system that can coat UV-blocking nanofibrous membrane. Conventional electrospinning systems are not portable, as they include a high voltage power supply(HVPS) that is large in size, heavy in weight, expensive and has a wired power supply. To overcome these limitations, we replaces HVPS with batteries and high-voltage amplifiers. Nanofibers contain nanoparticles to increase the UV blocking effect. In addition, we confirmed UV transmittance, water resistance, and removal test. Unlike conventional sunscreen agents, nanofiber-based sunscreen is expected to be very useful for organ transplant patients or skin disease patients who are vulnerable to UV rays.