Paweeya Raknim

Advisor: Professor Kun-Chan Lan


Design of Wearable Sensor Systems for Disease Prediction

Advances in wireless technologies, low-power electronics, the internet of things, and in the domain of connected health are driving innovations in wearable medical devices at a tremendous pace. Wearable sensor systems composed of ?exible and stretchable materials have the potential to better interface to the human skin, whereas silicon-based electronics are extremely ef?cient in sensor data processing and transmission. Therefore, ?exible and stretchable sensors combined with low-power silicon-based electronics are a viable and ef?cient approach for medical monitoring. Flexible medical devices designed for monitoring human vital signs have applications in ?tness monitoring, medical diagnostics including disease prediction. In this research, we investigate the feasibility of using wearable sensors for disease prediction. We designed two feasibility case studies of wearable sensor systems for specific disease predictions, hypertension and neonatal sepsis prediction.

The first case study is design wearable system for hypertension prediction. Objective: Heart rate variability (HRV) is often used to assess the risk of cardiovascular disease, and data on this can be obtained via electrocardiography (ECG). However, collecting heart rate data via photoplethysmography (PPG) is now a lot easier. We investigate the feasibility of using the PPG-based heart rate to estimate HRV and predict diseases. Materials and Methods: We obtain three months of PPG-based heart rate data from subjects with and without hypertension, and calculate the HRV based on various forms of time and frequency domain analysis. We then apply a data mining and big data technique to this estimated HRV data, to see if it is possible to correctly identify patients with hypertension. Result: We use six HRV parameters to predict hypertension, and find SDNN has the best predictive power. Conclusion: We show that early disease prediction is possible through collecting PPG-based heart rate information.

The second case study is design the wearable sensor system for neonatal sepsis prediction in the neonatal intensive care unit (NICU). We have applied principles of statistical signal processing and nonlinear dynamics to analyze heart rate time series from premature newborn infants in order to assist in the early diagnosis of sepsis, a common and potentially deadly bacterial infection of the bloodstream. We began with the observation of reduced variability and transient decelerations in heart rate interval time series for hours up to days prior to clinical signs of illness. We find that measurements of standard deviation, sample asymmetry and sample entropy are highly related to imminent clinical illness. We developed multivariable statistical predictive models, and an interface to display the real-time results to clinicians. Using this approach, we have observed numerous cases in which incipient neonatal sepsis was diagnosed and treated without any clinical illness at all. This case study focuses on the mathematical and statistical time series approaches used to detect these abnormal heart rate characteristics and present predictive monitoring information to the clinician.


Journal papers (SCI):

1. Lan, K.C., Raknim, P., Kao, W.F. and Huang, J.H., 2018. Toward Hypertension Prediction Based on PPG-Derived HRV Signals: a Feasibility Study. Journal of medical systems, 42(6), p.103.

2. Hu, M.C., Lan, K.C., Fang, W.C., Huang, Y.C., Ho, T.J., Lin, C.P., Yeh, M.H., Raknim, P., Lin, Y.H., Cheng, M.H. and He, Y.T., 2017. Automated tongue diagnosis on the smartphone and its applications. Computer methods and programs in biomedicine.

3. Raknim, P. and Lan, K.C., 2016. Gait monitoring for early neurological disorder detection using sensors in a smartphone: Validation and a case study of parkinsonism. Telemedicine and e-Health, 22(1), pp.75-81.

4. Huang, J.H., Su, T.Y., Raknim, P. and Lan, K.C., 2015. Implementation of a wireless sensor network for heart rate monitoring in a senior center. Telemedicine and e-Health, 21(6), pp.493-498.

Conference papers:

1. Huang, J.H., Wang, T.T., Su, T.Y., Lan, K.C. and Raknim, P., 2013, October. Experiences from deploying a heart rate monitoring system in a senior center. In ICT Convergence (ICTC), 2013 International Conference on (pp. 383-388). IEEE.

2. Raknim, P., & Lan, K. C. (2017). Development of project-based learning (PBL) for Internet of Things. In Proceedings of the 45th SEFI Annual Conference 2017 - Education Excellence for Sustainability, SEFI 2017 (pp. 1475-1480). European Society for Engineering Education (SEFI).


E-mail: paweeya@gmail.com

Laboratory for Experimental Network and Precision Medical System (LENS)

Department of Computer Science and Information Engineering

National Cheng Kung University (NCKU), Tainan, Taiwan

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