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구조적 형상 제어를 통한 인장에 내성을 가지는 전극 개발
양성진 ( Seongjin Yang ),홍성경 ( Seong Kyung Hong ),임근배 ( Geunbae Lim ) 한국센서학회 2021 센서학회지 Vol.30 No.3
Interest in healthcare and wearable devices has been increasing recently. A strain sensor is required in various wearable devices. With respect to such devices, studies on resistance changes in strain sensors using flexible materials are in progress. However, the resistance of the rest area in a strain sensor should not change according to the applied strain. So, an electrode with resistance to stretching, bending, and torsion is required in such strain sensors. Tension, bending, and torsion can be realized through structural shape control, rather than by using flexible materials. Further, such an electrode that maintains electrical properties has been developed and manufactured. This electrode can be used in various applications such as foldable devices, e-papers, batteries, and multifunctional wearable devices.
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.
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.
나노 크랙 기반의 안정성 있는 One-step laser encapsulation sensor 개발
박찬(Chan Park),정현석(Hyunsuk Jung),이현우(Hyunwoo Lee),홍성욱(Sunguk Hong),김형욱(Hyonguk Kim),홍성경(Seong Kyung Hong),조성진(Seong J. Cho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Recent, development of flexible strain sensors that can be attached directly onto the skin, such as wearable electronic devices, has attracted attention. However, flexible sensors are generally exposed to various environments, such as sweat, humidity or dust, which cause noise and shorten the sensor lifetimes. This study reports the development of a nano-crackbased flexible sensor with mechanically, thermally, and chemically stable electrical characteristics in external environments using a novel one-step laser encapsulation (OLE) method optimized for thin films. The OLE process allows simultaneous patterning, cutting, and encapsulating of a device using laser cutting and thermoplastic polymers. The processes are simplified for economical and rapid production. Sensors protected with OLE exhibit mechanical, thermal, and chemical stability under water-, heat-, dust-, and detergent-exposed conditions. As a result, we developed sensors that can be measured in various environments using OLE processes.