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34 results on '"Liao, Jia"'

3. Applying a Deep Learning Network in Continuous Physiological Parameter Estimation Based on Photoplethysmography Sensor Signals.

Author

Yen, Chih-Ta, Liao, Jia-Xian, and Huang, Yi-Kai

Abstract

In this paper, we propose a continuous physiological parameter estimation model based on a deep learning network for photoplethysmography (PPG) sensor signals. Signals of 8-s duration were incorporated into the proposed model in this study for frequent estimation of the systolic blood pressure (BP), diastolic BP, heart rate (HR), and mean arterial pressure of the human body; this facilitated early identification and monitoring of physiological conditions and thus reduced the risk of cardiovascular disease. The proposed model was designed using a convolutional neural network (CNN) and long short-term memory (LSTM) network. This model was trained and validated using the large-scale Multiparameter Intelligent Monitoring in Intensive Care database. The CNN was used to extract features from PPG signals automatically. This automatic extraction replaced the conventional manual feature extraction process. Features with time-series were then analyzed using the LSTM network to estimate physiological parameters. Subsequently, ten-fold cross-validation was conducted to reveal the mean absolute errors ± standard deviations of participants’ systolic BP, diastolic BP, HR, and mean arterial pressure to be 2.54 ± 3.88, 1.59 ± 2.45, 1.62 ± 2.55, and 1.59 ± 2.34 mmHg, respectively. These values meet the standards established by the Association for the Advancement of Medical Instrumentation and the British Hypertension Society. The proposed method facilitates the accurate, continuous monitoring of the BP and HR. [ABSTRACT FROM AUTHOR]

Published
2022
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33. PowerDepot.

Author

Hsu, Chen-Wei, Liao, Jia-Lu, Fang, Shan-Chien, Weng, Chia-Chien, Huang, Shi-Yu, Hsieh, Wen-Tsan, and Yeh, Jen-Chieh

Published
2011
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34. Compact Tri-Band Bandpass Filter Using Open Stub Loaded Tri-Section \lambda /4 Stepped Impedance Resonator.

Author

Wei, Xu-bo, Wang, Peng, Gao, Peng, Xu, Zi-qiang, Liao, Jia-xuan, Jin, Long, and Shi, Yu

Abstract

A modified tri-mode \lambda /4 stepped impedance resonator (SIR) is proposed, in which a shunt open stub is loaded in the conventional \lambda /4 tri-section SIR. The resonant frequencies and frequency ratios can be properly controlled by adjusting the loaded open stub. A compact second-order tri-band bandpass filter (BPF) based on two coupled proposed open stub loaded \lambda /4 tri-section SIR is presented. A pair of transmission zeros (TZs) are generated at the lower and upper stopband of each passband for high selectivity and excellent band-to-band isolation. A tri-band BPF with the central frequencies of 1.92, 3.50, 5.75 GHz, and respective fractional bandwidths of 5.4%, 4.0%, and 2.4% is designed and fabricated. Measured results show good agreement with simulations. Moreover, the circuit only occupies 0.09 \lambda g \times 0.10 \lambda g. [ABSTRACT FROM PUBLISHER]

Published
2014
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