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레일 온도의 정밀한 측정을 위한 휴대용 무선 계측 시스템 개발
김형욱(Hyonguk Kim),박찬(Chan Park),윤종원(Jongwon Yoon),정연도(Yeondo Jeong),박철정(CheolJeong Park),이병준(Byeongjun Lee),김정민(Jungmin Kim),박상준(Sang J. Park),김광우(Kwang Woo Kim),곽성렬(Sung Yeol Kwak),조성진(Seong J. Cho) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.4
현재 궤도 좌굴을 예방하기 위하여 고정형 레일 온도 모니터링 시스템을 통해 선로의 온도를 관리하고 있다. 하지만 설치된 레일에 비해 모니터링 시스템의 수가 부족하다. 또한 직접 계측에 사용되는 접촉식 온도계와 비접촉식 온도계는 측정 위치와 다양한 물리량에 따라 값이 달라진다. 본 연구에서는 기존의 레일 온도 계측 시스템의 한계를 개선한 휴대용 레일 온도 측정 시스템을 제안한다. 레일의 형상에 맞추어 설계하여 일정한 위치에서 높은 정확도로 온도를 측정할 수 있다. 또한 박막형 열전대의 사용과 기구부 설계를 통해 빠른 측정 속도와 낮은 측정 오차를 달성했다. 자석 기반의 부착 방식으로 시스템의 설치 및 제거가 용이하며, 스마트 기기에서 데이터의 모니터링 및 저장이 가능하다. The Korea Railroad Corporation is managing rail temperatures with a fixed rail-temperature monitoring system to prevent track buckling. However, the number of monitoring systems being used is insufficient compared to the railway network. In addition, contact and noncontact thermometers used for direct measurements provide different readings depending on the measurement locations and various physical quantities. In this study, we propose a portable rail-temperature measurement system that improves the limitations of previous instrumental systems. The proposed system is designed according to the shape of the rail to measure temperatures with high precision at specific positions. In addition, through the use of thin-film thermocouples and a mechanical attaching part, quick measurements with low errors were achieved. The magnet-based attachment method facilitates easy installation and removal of the system such that it is possible to monitor and store data in a smart device.
이병준(Byeongjun Lee),박찬(Chan Park),김형욱(Hyonguk Kim),박철정(CheolJeong Park),김정민(Jungmin Kim),정연도(Yeon-Do Jeong),송영현(Younghyeon Song),조성진(Seong J. Cho) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
As the harmfulness of Ultraviolet rays is widely known, it has become important to protect the skin from ultraviolet rays. UV can cause cancer, wrinkles. Most people choose sunscreens and textiles to protect against UV rays. However, conventional sunscreens have promoting skin disorders due to chemical composition, and short duration. Here, we introduce a novel portable electrospinning system that can coat nanofibrous sunscreen directly onto the skin. nanofibrous sunscreen has suitable structure for UV protection due to its high specific surface area. However, conventional electrospinning systems are not portable, as they include a high voltage power supply that is large in size, heavy in weight. To overcome these limitations, we have developed a one-handed electrospinning system that replaces HVPS with batteries and high-voltage amplifiers. We have confirmed that nanofibers with similar structures to that of conventional electrospinning devices can be fabricated by portable electrospinning system. Nanofibrous sunscreen were fabricated by PU and nanoparticles such as ZnOor TiO2 to increase the UV blocking effect. In addition, we confirmed that UV protection effect, durability and reduced irritation from the physical interception by analyzing ultraviolet transmittance, water resistance, and removal test. Finally, we have successfully developed a portable electrospinning system for the UV blocking.
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.
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.