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반사형 Pulse Oximeter를 통한 스마트 손목시계
이후석 ( Hooseok Lee ),탑타른 ( Tharoeun Thap ),문찬기 ( Chanki Moon ),남윤영 ( Yunyoung Nam ),이진석 ( Jinseok Lee ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
본 논문은 웨어러블 디바이스의 한 종류로써의 스마트와치에 적용할 수 있는 헬스케어 기술에 대한제안이다. RED LED와 IR LED를 통해 얻어진 신호로부터 아날로그 필터 증폭을 통해 얻어진 PPG신 호를 이용하여 생체신호인 심박수와 SpO<sub>2</sub>를 측정하여 보았다. 이 신호를 블루투스 통신을 통해 PC에서 데이터를 받아 보았고, 추후에 스마트폰과 연동하여 실용적으로 사용 될 수 있다.
Kwon-Ha Yoon,Yunyoung Nam,Tharoeun Thap,Changwon Jeong,Nam Ho Kim,Joem Seok Ko,Se-Eung Noh,Jinseok Lee 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
Atrial fibrillation (AF) and Congestive heart failure (CHF) are increasingly widespread, costly, deadly diseases and are associated with significant morbidity and mortality. In this study, we analyzed three statistical methods for automatic detection of AF and CHF based on the randomness, variability and complexity of the heart beat interval, which is RRI time series. Specifically, we used short RRI time series with 16 beats and employed the normalized root mean square of successive RR differences (RMSSD), the sample entropy and the Shannon entropy. The detection performance was analyzed using four large well documented databases, namely the MIT-BIH Atrial fibrillation (n =23), the MIT-BIH Normal Sinus Rhythm (n =18), the BIDMC Congestive Heart Failure (n =13) and the Congestive Heart Failure RRI databases (n =25). Using thresholds by Receiver Operating Characteristic (ROC) curves, we found that the normalized RMSSD provided the highest accuracy. The overall sensitivity, specificity and accuracy for AF and CHF were 0.8649, 0.9331 and 0.9104, respectively. Regarding CHF detection, the detection rate of CHF (NYHA III-IV) was 0.9113 while CHF (NYHA I-II) was 0.7312, which shows that the detection rate of CHF with higher severity is higher than that of CHF with lower severity. For the clinical 24 hour data (n =42), the overall sensitivity, specificity and accuracy for AF and CHF were 0.8809, 0.9406 and 0.9108, respectively, using normalized RMSSD.
정희원 ( Hee-won Chung ),탑타른 ( Tharoeun Thap ),문찬기 ( Chanki Moon ),남윤영 ( Yunyoung Nam ),이진석 ( Jinseok Lee ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
다양한 종류의 생체 신호들을 모니터링하는 연구들이 활발히 진행되면서 이제는 병원이나 전문기관뿐만 아니라 일상 생활 속 에서 사람들이 스마트폰을 이용하여 특별한 제약 없이 편리하게 측정 가능하다. 이러한 스마트폰의 특성을 살리고 그 중 카메라 PPG (Photo-plethysmography) 모듈을 통해 얻은 생체 신호 정보를 분석하여 사용자에게 분석된 정보를 보여줄 수 있다. 또한 얻은 생체 신호로 심박수를 구하고 얻어진 심박수 정보를 활용하여 이를 사용자에게 Hologram 으로 보여주는 것을 목표로 한다.
Yoon, Kwon-Ha,Nam, Yunyoung,Thap, Tharoeun,Jeong, Changwon,Kim, Nam Ho,Ko, Joem Seok,Noh, Se-Eung,Lee, Jinseok The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
Atrial fibrillation (AF) and Congestive heart failure (CHF) are increasingly widespread, costly, deadly diseases and are associated with significant morbidity and mortality. In this study, we analyzed three statistical methods for automatic detection of AF and CHF based on the randomness, variability and complexity of the heart beat interval, which is RRI time series. Specifically, we used short RRI time series with 16 beats and employed the normalized root mean square of successive RR differences (RMSSD), the sample entropy and the Shannon entropy. The detection performance was analyzed using four large well documented databases, namely the MIT-BIH Atrial fibrillation (n=23), the MIT-BIH Normal Sinus Rhythm (n=18), the BIDMC Congestive Heart Failure (n=13) and the Congestive Heart Failure RRI databases (n=25). Using thresholds by Receiver Operating Characteristic (ROC) curves, we found that the normalized RMSSD provided the highest accuracy. The overall sensitivity, specificity and accuracy for AF and CHF were 0.8649, 0.9331 and 0.9104, respectively. Regarding CHF detection, the detection rate of CHF (NYHA III-IV) was 0.9113 while CHF (NYHA I-II) was 0.7312, which shows that the detection rate of CHF with higher severity is higher than that of CHF with lower severity. For the clinical 24 hour data (n=42), the overall sensitivity, specificity and accuracy for AF and CHF were 0.8809, 0.9406 and 0.9108, respectively, using normalized RMSSD.
김영주,김병욱,권영만,김종율,김명수,조규성,전홍영,Tharoeun Thap,이진석,윤권하 한국광학회 2014 Current Optics and Photonics Vol.18 No.3
Columnar-structured cesium iodide (CsI) scintillators doped with thallium (Tl) are frequently used as x-ray converters in medical and industrial imaging. In this study we investigated the imaging characteristics of CsI:Tl films with various reflective layers―aluminum (Al), chromium (Cr), and titanium dioxide (TiO2) powder―coated on glass substrates. We used two effusion-cell sources in a thermal evaporator system to fabricate CsI:Tl films on substrates. The scintillators were observed via scanning electron microscopy (SEM), and scintillation characteristics were evaluated on the basis of the emission spectrum, light output, light response to x-ray dose, modulation transfer function (MTF), and x-ray images. Compared to control films without a reflective layer, CsI:Tl films with reflective layers showed better sensitivity and light collection efficiency, and the film with a TiO2 reflective layer showed the best properties.
전송선로와 인덕터를 이용한 평판형 디스크 공진기의 등가회로
유상태(Sang-Tai Yu),최영수(Young-Soo Choi),박선주(Sun-Ju Park),Tharoeun Thap,Baatarkhuu Dorjsuren,한상민(Sang-Min Han),임종식(Jong-Sik Lim),안달(Dal Ahn) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
본 논문에서는 평판형 디스크 공진기의 등가회로를 전송선로와 인덕터를 이용하여 구현하였다. EM 시뮬레이션을 통하여 반지름이 25㎜인 디스크 공진기의 S-parameter 결과를 얻고 이와 동일한 S-parameter를 갖는 구조를 마이크로스트립라인과 인덕터를 이용하여 구현하였다. 평판형 디스크 공진기의 EM 시뮬레이션 결과와 등가회로의 circuit 시뮬레이션의 결과가 일치함을 보임으로써 디스크 공진기의 등가회로의 타당함을 보였다. In this paper, a equivalent circuit of planar disk resonator is realized using transmission lines and inductors. A S-parameter result of planar disk resonator with radius 25㎜ is obtained, and the equivalent circuit for the planar disk resonator realizes using transmission lines and inductors. The equivalent circuit shows excellent accuracy by comparing the EM simulation result of planar disk resonator to circuit simulation result of equivalent circuit.