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윤대권(Daekwon Yun),이해택(Haetaek Lee),남일우(Ilwoo Nam),이헌규(Heongyu Lee),김용현(Yonghyeon Kim),윤재곤(Jaegon Yun),김주영(Jooyoung Kim),하성용(Seongyong Ha) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
This study, the exchange value of the car after the repair, which affects the valuation elements and repair characteristics factors were investigated. Based on this specific accident damaged condition of the car, repair range, repair methods, repair costs, market transactions, taking into account the vehicle"s value appraisal method is proposed.
Simplified Structural Textile Respiration Sensor Based on Capacitive Pressure Sensing Method
Se Dong Min,Yonghyeon Yun,Hangsik Shin IEEE 2014 IEEE SENSORS JOURNAL Vol.14 No.9
<P>We propose a simplified structural textile capacitive respiration sensor (TCRS) for respiration monitoring system. The TCRS is fabricated with conductive textile and Polyester, and it has a simple layered architecture. We derive the respiration by the distance changes between two textile plates in the TCRS, which measures the force from the abdominal diameter changes with the respiratory movement. To evaluate the reliability of TCRS, both linearity test and comparison test were carried out. Three times of tensile experiment were performed to confirm the linearity of change in capacitance by the distance change. The result shows that the coefficient of determination (R<SUP>2</SUP>) of proposed TCRS is 0.9933. For comparative study, 16 subjects were participating in the experiment. As a result, the proposed respiratory rate detection system using TCRS successfully measures respiration compared with nasal airflow detection (R = 0.9846, p <; 0.001). In Bland-Altman analysis, the upper limit agreement is 0.5018 respirations per minute and lower limit of the agreement is -0.5049 respirations per minute. From these results, we confirmed that the TCRS could be used for monitoring of unconscious persons, avoiding the uncomfortness of subjects. Monitoring respiration using TCRS offers a promising possibility of convenient measurement of respiration rates. In particular, this technology offers a potentially inexpensive implementation that could extend applications to consumer home-healthcare and mobile-healthcare products.</P>
Characteristics of Piezoelectric Polymeric PVDF Sensor by Impact Testing
Sojeong Kim(김소정),Ji-Yeon Shin(신지연),Yonghyeon Yun(윤용현),Deuk Yong Lee(이득용),Dong-Ho Yang(양동호),Bae-Yeon Kim(김배연),Yo-Seung Song(송요승) 한국고분자학회 2019 폴리머 Vol.43 No.5
근거리 전기방사법을 이용하여 유량속도 139 nL/min, 전기장 세기 12 kV/cm, 콜렉터 속도 500 mm/s로 18 wt% 폴리(비닐리덴 플루오라이드)(PVDF) 섬유를 제조하였다. PVDF 섬유 모듈은 폴리(에틸렌 테레프탈레이트) 필름 위에 위치하였다. 모듈은 0.5 mm 간격으로 섬유 20줄로 구성되어 있다. 압전성과 진동 센서특성은 Al 외팔보를 이용한 충격실험을 통해 조사하였다. PVDF 센서와 lead zirconate titanate(PZT) 센서는 Al 외팔보 양면 끝에서 5 mm 위치에 에폭시를 이용 부착하였다. PVDF 센서의 전압특성은 PZT 센서보다 200배 정도 작았지만 출력 특성파형은 유사하였다. 파장 측정 결과, 두 센서 모두 Al 외팔보의 고유 파장에서 관찰되었다. The 18 wt% poly(vinylidene fluoride) (PVDF) fibers were near-field electrospun at a flow rate of 139 nL/min, an electric field of 12 kV/cm, and a collector speed of 500 mm/s. A PVDF fiber array consisting of 20 fibers was adhered to the flexible PET film. A PVDF and a lead zirconate titanate (PZT) sensors were attached at a distance of 5 mm from the clamped end of the Al cantilever. The vibration sensing capabilities of sensors were examined by measuring the potential generated by the sensors during impact testing. Although the voltage of PVDF sensor was 200 times smaller than that of PZT sensor, the waveforms of the sensor output were similar. Both sensors were determined to be sensitive to variations in the level of dynamic strain due to the inherent piezoelectricity. The spectral results of both sensors exhibited the same signal generated by natural frequency of cantilever.