http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
호흡기류 계측모듈의 교정과 성능 비교를 위한 실용적인 표준기류 생성 시스템
이인광,박미정,이상봉,김경옥,차은종,김경아,Lee, In-Kwang,Park, Mi-Jung,Lee, Sang-Bong,Kim, Kyoung-Ok,Cha, Eun-Jong,Kim, Kyung-Ah 대한의용생체공학회 2015 의공학회지 Vol.36 No.4
A standard air flow generator system was developed to generate air flows of various levels simultaneously applied to two different air flow transducer modules. Axes of two identical standard syringes for spirometer calibration were connected with each other and driven by a servo-motor. Linear displacement transducer was also connected to the syringe axis to accurately acquire the volume change signal. The user can select either sinusoidal or square waveform of volume change and manually input any volume as well as maximal flow rate levels ranging 0~3 l and 0~15 l/s, respectively. Various volume and flow levels were input to operate the system, then the volume signal was acquired followed by numerical differentiation to obtain the air flow signal. The measured volumes and maximal air flow rates were compared with the user input data. The relative errors between the user-input and the measured stroke volumes were all within 0.5%, demonstrating very accurate driving of the system. In case of the maximal flow rate, relatively large error was observed when the syringe was driven very fast within a very short time duration. However, except for these few data, most measured flow rates revealed relative errors of approximately 2%. When the measure and user-input stroke volume and maximal flow rate data were analyzed by linear regression analysis, respectively, the correlation coefficients were satisfactorily higher than 0.99 (p < 0.0001). These results demonstrate that the servo-motor controls the syringes with enough accuracy to generate standard air flows. Therefore, the present system would be very much practical for calibration process as well as performance evaluation and comparison of two different air flow transducer modules.
李仁光(In-Kwang Lee),金盛植(Seong-Sik Kim),張鐘贊(Jong-Chan Jang),金君珍(Koon-Jin Kim),金敬娥(Kyung-Ah Kim),李泰洙(Tae-Soo Lee),車殷宗(Eun-Jong Cha) 대한전기학회 2008 전기학회논문지 Vol.57 No.7
Respiration is induced by muscular contraction of the chest and abdomen, resulting in the abdominal volume change. Thus, continuous measurement of the abdominal dimension enables to monitor breathing activity. Conductive rubber cord has been previously introduced and tested to develop wearable application for respiratory measurements. This study implemented respiratory monitoring system with the conductive rubber cord in the patient's pants in purpose of quantitative estimation of tidal volume. Air mixed with 0~5% CO₂ was inhaled and the respiratory air flow rate, abdominal dimension change, and end tidal CO₂ concentration were simultaneously measured in steady state. CO₂ inhalation significantly increased the tidal volume in normal physiological state with the subject unawared. The tidal volume estimated from the abdominal dimension change linearly correlated with the tidal volume measured by a pneumotachometer with a correlation coefficient of 0.88. Customized calibration for each subject resulted in relative errors less than 10%. Therefore, the tidal volume was accurately estimated by measuring the abdominal dimension change.
李仁光(In-Kwang Lee),金盛植(Seong-Sik Kim),張鐘贊(Jong-Chan Jang),金君珍(Koon-Jin Kim),金敬娥(Kyung-Ah Kim),李泰洙(Tae-Soo Lee),車殷宗(Eun-Jong Cha) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
Abdominal circumference changes due to breathing by the respiratory muscle activity such as diaphragm, which would partially represent the lung volume variation. The present study introduced conductive rubber molded in a cord shape incorporated with a patient's pants. The conductive rubber cord operated as a displacement transducer to measure the lung or abdominal volume changes. Signal extraction circuitry was developed to obtain the volume and its derivative(or the flow) signals followed by wireless transmission based on the Zigbee communication protocol in a size of 65㎜×105㎜ easily put in pocket. Breathing frequency was accurately evaluated and breath pattern analysis seemed feasible, since respiratory behaviours such as maximal inspiration and cough were well identified. Remote wireless receiver module also enabled to monitor both volume and flow signals during resting breathing on a PC terminal.