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박막형 유연 압력 센서의 제작과 고주파소작술환경 내 실시간 압력 모니터링에의 활용
정용록(Yongrok Jeong),박재호(Jaeho Park),김규영(Kyuyoung Kim),박인규(Inkyu Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Radiofrequency ablation (RFA) is the promising method in field of minimally invasive cancer surgery. However, due to the high temperature and packed ablating site, treatment pressure is very high, and this can cause the explosive popping of the steam, named “steam popping”. This steam popping can cause the recurrence and metastasis of the cancer, so it is very critical to the patient. To solve this problem, the method to monitor the internal tissue pressure during RFA was suggested in this research. The thin film based flexible pressure sensor was fabricated and attached on the RFA needle. Pressure was measured through the change of contact resistance between microstructured PI/CNT film and electrode. In conclusion, pressure sensor integrated RFA needle detect the steam popping, successfully.
3D 프린트 된 몰드로 제작한 마이크로범프와 액체 금속을 이용한 헬스 케어를 위한 웨어러블 유연 압력센서 개발
김규영(Kyuyoung Kim),정용록(Yongrok Jeong),최중락(Jungrak Choi),김민성(Minseong Kim),박재호(Jaeho Park),김승환(Seunghwan Kim),오용석(Yongsuk Oh),박인규(Inkyu Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
We introduce a wearable microfluidic pressure sensor using 3D printing technology for health monitoring applications. Our pressure sensor fabricated with elastomer and liquid metal that provide stretchability has an enhanced sensitivity compared to other reported microfluidic pressure sensors. Also, 5,000 cyclic test showed its reliable and stable signal response. The microchannels are fabricated by 3D-printed microchannel molds with 3D-printed microbumps. The effect of microbump in the channel was analyzed using finite element method (FEM) simulation and demonstrated through various eletromechanical experiments. For health monitoring applications, human body pressure distribution was monitored in real-time using pressure sensor array attached on the clothes. The pressure sensing system using the proposed pressure sensor would be applied to early diagnosis and prevention of diseases such as bedsores.
Wireless Wearable GRF Sensing System for Continuous Measurements
이동관(Dongkwan Lee),정용록(Yongrok Jeong),구광민(Gwang Min Gu),김정(Jung Kim) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.3
This paper presents a wireless ground reaction force (GRF) sensing system for ambulatory GRF recording. The system is largely divided into three parts: force sensing modules based on optical sensor, outsole type frame, and embedded system for wireless communication. The force sensing module has advantages of the low height, robustness to the moment interference, and stable response in long term use. In simulation study, the strain and stress properties were examined to satisfy the requirements of the GRF sensing system. Four sensing modules were mounted on the toe, ball, and heel of foot shaped frame, respectively. The GRF signals were extracted using Micrpcontroller unit and transferred to the smart phone via Bluetooth communication. We measured the GRF during the normal walking for the validation of the continuous recording capability. The recorded GRF was comparable to the off the shelf stationary force plate.