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웨어러블 심전도 측정과 임상 심전도 측정과의 상관관계에 대한 연구
이강휘(Kang-Hwi Lee),이성수(Seong-Su Lee),김상민(Sang-Min Kim),이혁재(Hyeok-Jae Lee),민경진(Kyoung-Jin Min),강현규(Hyun-Kyu Kang),이주현(Joo-Hyeon Lee),곽휘권(Hwy-Kuen Kwak),고윤수(Yun-Soo Ko),이정환(Jeong-Whan Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.12
Recent advances in ICT technology have transformed many of our daily lives and attracted a lot of attention to personal health. Heart beat measurement that reflects cardiac activities has been used in various fields such as exercise evaluation and psychological state evaluation for a long time, but its utilization method is limited due to its differentiation from clinical electrocardiogram. Therefore, in this study, we could observe the change of the measured signal according to the change of the distance and the position of the measuring electrodes which are non-standard electrode configuration. Based on the electric dipole model of the heart, correlation with clinical electrocardiogram could be confirmed by synthesizing multiple surface potentials measured with a shorter electrode distance than standard one. From the electromagnetic point of view, the distance between the measuring electrodes corresponds to the distance that the electric potential by the cardiac electric dipole moves, and the electric potential measured at the body surface is proportional to the moving distance of the electric potential. Therefore, it is preferable to make the distance between electrodes as long as possible, and to position the measuring electrode close to the ventricle rather than the atrium. In addition, it was found that standard electrocardiographic waveforms could be synthesized by using arithmetic sum of multiple measuring electrodes due to the relationship of electrical dipole vectors, which is obtained by dividing and positioning a plurality of measuring electrodes on a reference electrode line, such as Lead-I, Lead-II direction. Also, we obtained a significant Pearson correlation coefficient (r = 0.9113 ± 0.0169) as a result of synthetic experiments on four subjects.
원격 모니터링을 위한 소형 저전력 기반의 인퓨전 펌프 장치의 개발
이강휘(Kang-Hwi Lee),이성수(Sung-Su Lee),조성동 (Sung-Dong Jo),이혁재(Hyek-Jae Lee),김동준(Dong-Jun Kim),이정환(Jeong-Whan Lee) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.2
본 연구에서는 소형 저전력 기반의 인퓨전 펌프의 개발을 통해 환자의 수액 투여량을 미세 조절 하여 사용의 편의성 및 안전성을 증대 시키고 이중 체크밸브 및 연동형 기어 모터를 사용하여 제작 원가를 낮추어 인퓨전 펌프의 사용자 부담을 줄이고자 하였다. 그리고 의료진의 수액 투여에 관한 환자 관리의 효율성을 높이기 위해 무선 통신 기반의 원격 모니터링 기능을 구현하였다. 기존의 인퓨전 펌프는 튜브 내의 수액을 이동시키기 위하여 회전형 또는 직선형 Peristaltic Pump 구조를 사용한다. 이는 강한 회전 토크를 필요로 하기 때문에 모터의 크기가 커지고 이를 위해 대용량의 배터리를 사용하게 되어 인퓨전 펌프의 전체 부피가 커져 이동이 필요한 수액 투여 환자들에게 부담감을 증가시킨다. 본 연구에서는 이를 개선하기 위해 생체모방형 Muscle Pump 구조를 가지는 이중 체크 밸브를 고안하여 소형, 저가의 DC 기어 모터 기반의 인퓨전 펌프구조를 설계하였다. 본 연구에서는 수액 흐름을 미세하게 제어하기 위하여 연동형 기어 모터 구조를 최적화 하였으며 마이크로컨트롤러의 PWM 제어를 통해 수액유출량을 측정 하는 실험을 수행하여 기존 장비와의 성능비교를 통해 기능을 검증하였다. 고안된 인퓨전 펌프를 통해 수액 주입량을 실시간 모니터링 하면 관리자의 편의성을 증대 시킬 뿐만 아니라 저렴한 비용으로 보다 많은 환자에게 정밀한 수액 투여 환경을 제공할 수 있다.
마이크로 프로세서 기반 Lock-In-Amp를 이용한 텍스타일 직물전극의 체온 측정에 관한 연구
이강휘(Kang-Hwi Lee),이성수(Sung-Su Lee),이정환(Jeong-Whan Lee),송하영(Ha-Young Song) 대한전기학회 2017 전기학회논문지 Vol.66 No.7
Generally, a thermistor made by sintering a metal oxide is widely used to measure the ambient temperature. This thermistor is widely used not only for industrial use but also for medical use because of its excellent sensitivity, durability, temperature change characteristics and low cost. In particular, the normal body temperature is 36.9 degrees relative to the armpit temperature, and it is most closely related to the circulating blood flow. Previous studies have shown that body temperature changes during biomechanical changes and body temperature changes by anomalous signs or illnesses. Therefore, in this study, we propose a Lock-In-Amp design to detect minute temperature changes of clothing and thermistor wired by a preacher as a method to regularly measure body temperature in daily life. Especially, it is designed to measure the minute resistance change of the thermistor according to body temperature change even in a low-cost microprocessor environment by using a micro-processor-based Lock-In-Amp, and a jacquard and the thermistor is arranged so as to be close to the side, so that the reference body temperature can be easily measured. The temperature was measured and stored in real time using short-range wireless communication for non - restraint temperature monitoring. A baby vest was made to verify its performance through temperature experiments for infants. The measurement of infant body temperature through the existing skin sensor or thermometer has limitations in monitoring infant body temperature for a long time without restriction. However, it can be overcome by using the embroidery fabric based micro temperature monitoring wireless monitoring device proposed in this study.
수정된 바이폴라 전극을 갖는 착용형 심장활동 모니터링 시스템 구현 및 임상 심전도와의 상관관계 분석
李康輝(Kang-Hwi Lee),李定桓(Jeong-Whan Lee),李映在(Young-Jae Lee),金敬燮(Kyeong-Seop Kim),梁熙卿(Heui-Koung Yang),申建洙(Kun-Su Shin),李明鎬(Myoung-Ho Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
Wearable physiological signal monitoring systems are regarded as an important sensing unit platforms in ubiquitous/mobile healthcare application. In this paper, we suggested the modified bipolar electrodes implemented on the portable heart activity monitoring system, which minimized the distance of electrodes formed on a attachable pad. The proposed electrode configuration is useful in mobile measurement environments, but has a disadvantage of reduced amplitude of the heart action potential. In order to overcome the shortcoming of the suggested electrode configuration, we implemented the amplifying circuit to increase the signal-gain and decrease the artifacts. For evaluations, we analyzed the specificity of measured cardiography using the proposed electrodes through the comparing of heart activity monitoring system with standard clinical ECG(lead2) by pearson correlation coefficients. The result showed that the average correlation coefficient is 0.903±0.036, 0.873±0.072 at V3, V4 chest lead position, respectively. Thus, the modified bipolar electrode is quite suitable to monitor the electrical activity of the heart in the situation of the mobile environment, and could be considered having high similarity with standard clinical ECG.