발목 PPG 신호 처리 개선을 위한 Zero Phase Filter 설계 및 시스템 연구

다국어 초록 (Multilingual Abstract)

One of the areas of steady interest in modern society is health. In addition, in order to keep the individual’s health at its best, the healthcare device market is undergoing many trials and developments. The latest threat to COVID-19 is a major threat to heart disease patients, and it is time for continuous monitoring technology to be needed to prevent it. In particular, PPG sensor technology is relatively commercialized amid various attempts to analyze cardiovascular conditions. In general, we prefer to measure signals from fingers and wrists, which have a stable advantage in obtaining signals. However, there are cases where it is not suitable for the user’s lifestyle, which creates inconvenience. In this study, signal is measured from the ankles to minimize the inconvenience that users may experience when wearing them. And IIR Filter is applied for stable signal acquisition and analysis. Phase Delay, one of the disadvantages of this, is an unnecessary factor in real-time analysis. Zero Phase Filter is designed and applied to the system for further signal analysis. The results of the study compared three types of raw data, IIR Filter data, and Zero Phase Filter data acquired from PPG sensors, and were able to confirm the tendency of Zero Phase Filter data to match the peak points of raw data relative to IIR Filter data. The above results indicate the tendency for in-depth analysis of signals free from Phase Delay in the real-time acquisition of ankle PPG signals. Through peak-to-peak analysis and deep development of algorithms, various applications are expected to be possible by designing stress estimation and fatigue estimation systems that do not constrain users’ upper bodies.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 본론
• 3. 결론
• References

참고문헌 (Reference)

1 김남섭, "손목시계 형태의 투과형 PPG 측정 장치의 구현에 관한 연구" 한국정보전자통신기술학회 10 (10): 161-167, 2017

2 임채영, "무선 심전도측정을 통한 스트레스 평가에 관한 연구" 한국컴퓨터정보학회 16 (16): 17-24, 2011

3 윤서진, "VPG IIR Filter PPG PPI 와 를 이용한 신호의 계측 시스템" 대한전기학회 69 (69): 617-622, 2020

4 Chan-Soo Park, "The Method to Measure Heart Rate using the Wrist Wearable Device" 43-44, 2019

5 Jung-Hoon Park, "Technology and market trends of healthcare wearable devices" 45 (45): 48-56, 2018

6 Seul-Chan Lee, "Research Model for Analysis of User Acceptance Factors of Wearable Devices" 385-393, 2015

7 이원석, "PPG 센서를 이용한 심박 모니터링 시스템 구현" 대한전자공학회 54 (54): 138-142, 2017

8 Sang-Jin Han, "Investigation of Optical Conditioning for Multi-wavelength PPG measurement on Wrist" 307-308, 2017

9 American College of Cardiology, "COVID-19 and Cadiovascular Disease"

10 Seo-Jin Yoon, "A Fundamental Study on Filter Technique for Photoelectric Pulse Wave Measurements in the Posterior Tibial Artery and Foot Artery" 302-303, 2019