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이정훈,이전,이효기,이경중,Lee, Junghun,Lee, Jeon,Lee, Hyo-Ki,Lee, Kyoung-Joung 대한의용생체공학회 2013 의공학회지 Vol.34 No.2
This paper proposes a new algorithm for sleep apnea detection based on stroke volume. It is very important to detect sleep apnea since it is a common and serious sleep-disordered breathing (SDB). In the previous studies, methods for sleep apnea detection using heart rate variability, airflow and blood oxygen saturation, tracheal sound have been proposed, but a method using stroke volume has not been studied. The proposed algorithm consists of detection of characteristic points in continuous blood pressure signal, estimation of stroke volume and detection of sleep apnea. To evaluate the performance of algorithm, the MIT-BIH Polysomnographic Database provided by Phsio- Net was used. As a result, the sensitivity of 85.99%, the specificity of 72.69%, and the accuracy of 84.34%, on the average were obtained. The proposed method showed comparable or higher performance compared with previous methods.
이정훈(Junghun Lee),김지훈(Jihoon Kim),김민기(Min-Gi Kim),김형훈(Hyung-Hoon Kim),김형동(Hyeong-Dong Kim) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.12
본 논문에서는 격리도 향상 공진기(isolating resonator)를 사용하여 격리도를 향상시킨 안테나를 제안하였다. Wi-Fi 주파수(2.4~2.5 GHz) 대역에서 동작하는 두 개의 루프 안테나는 그라운드의 센터를 중심으로 대칭으로 설계되었고, 이격거리가 매우 가깝다. Wi-Fi 주파수 대역에서의 격리도 저하 특성을 개선하기 위해 두 안테나 사이에 격리도 향상 공진기를 삽입하였다. 제안된 격리도 향상 공진기는 슬롯타입 구조로 공진기의 사이즈 조절을 통해 격리도 특성을 향상시키고, 삽입된 커패시터(CD)를 통해 공진기의 공진 주파수를 이동시킴으로써 목표 주파수에서의 격리도 특성을 쉽게 향상시킬 수 있다. In this paper, isolation enhanced antenna using isolating resonator was proposed. Two loop type antennas were designed to operate at Wi-Fi band(2.4~2.5 GHz), in symmetry to the center, and are closely located to each other. In order to enhance isolation characteristics at Wi-Fi bands, isolating resonator was designed between the two loop type antennas. The proposed isolating resonator is a slot type antenna that enhances isolation with the control of the size, and by adjusting the value of capacitor(CD) the resonant frequency of the isolating resonator can easily be adjusted to enhance isolation characteristic at the target frequency.