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Wireless, Skin-mountable, Crack-activated Pressure Sensor
S. J. Cho(조석주),I. K. Park(박인규) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Wireless, skin-mounted, pressure sensor capable of sensitive, accurate and reliable measurement has great potential for healthcare monitoring. To effectively monitoring the pressure in skin-interface, there is a need for a wearable pressure sensor that enables real-time monitoring that can provide quantitative pressure and time information and does not cause discomfort of movement even when attached to various parts of the body. Recently, several types of research about skin-mountable wireless pressure sensors have been proposed that can noninvasively monitor the human body. However, realtime tracking and monitoring about pressure/temperature distribution studies with stability and reliability for clinic testing are in the early stages. Despite studies on the structure of various nanomaterials and pressure sensors, there are insufficient medical wearable devices that simultaneously satisfy low-pressure measurement, high sensitivity, linearity, low hysteresis, and mechanical stability. This paper proposes a wireless, battery-free, crack-activated pressure sensing system capable of real-time monitoring of the pressure and temperature in skin-interface. This pressure sensing system combines a Near-Field Communication (NFC) module with a crack-activated metal film (CAMF) based pressure sensor. The pressure sensor shows excellent stability as well as high sensitivity. Also, we evaluate the wireless sensing performance of the pressure sensor integrated with the multiplexed antenna system.
서울시 도로주변 및 주거지역의 오존농도 변화에 대한 장기연구
정수연 ( Su Yeon Jung ),김기현 ( Ki Hyun Kim ),김동호 ( Dong Hoh Kim ),조석주 ( S. J. Cho ),김민영 ( M. Y. Kim ) 한국환경분석학회 2009 환경분석과 독성보건 Vol.12 No.3
In this study, the concentrations of ozone were analyzed from both urban residential area (U-RA) and urban roadside (U-RS) sites located in Seoul, Korea for the 11 year duration (1996 to 2006). The ozone concentrations at U-RA (14±8.8 ppb) were 50% higher than U-RS site (9.35±5.9 ppb) in association with the local NO sources. The maximum hourly ozone concentration during the day reached 36.4 ppb at 1600 LST, while the minimum of 6.61 ppb was seen at 0800 LST (U-RA). Evaluation of seasonal trend indicated that high ozone concentrations were observed during summer followed by fall and winter. The monthly mean concentrations at U-RA were higher in June (21 ppb) and lower in December (6.8 ppb), while their counterparts at U-RS were 15.3 and 5.7 ppb, respectively. The annual mean values of O3 tend to sensitively reflect the concentration changes in May through September over a year. Consequently, the trends of ozone are found to be fairly dependent on the photochemical activity. According to this study, the overall ozone trend at U-RA is characterized with a steady rise from 2004, while those fo at U-RS with a constant decrease from 2001. It also suggests that the ozone concentrations tend to vary in relation with a number of parameters including the precursor emissions (NO and NO2) and meteorological factors (turbulent mixing, temperature, and solar radiation).