Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Unconstrained Estimation of Body Postures on Bed Using Polyvinylidene Fluoride Film-based Sensor

PVDF 필름 기반 센서를 이용한 무구속적인 누운 자세 추정

  • Seo, Sangwon (Interdisciplinary Program in Bioengineering, Seoul National University) ;
  • Hwang, Su Hwan (Interdisciplinary Program in Bioengineering, Seoul National University) ;
  • Yoon, Hee Nam (Interdisciplinary Program in Bioengineering, Seoul National University) ;
  • Jung, Da Woon (Interdisciplinary Program in Bioengineering, Seoul National University) ;
  • Choi, Jae Won (Department of Neuropsychiatry and the Center for Sleep and Chronobiology, Seoul National University Hospital) ;
  • Lee, Yu Jin (Department of Neuropsychiatry and the Center for Sleep and Chronobiology, Seoul National University Hospital) ;
  • Jeong, Do-Un (Department of Neuropsychiatry and the Center for Sleep and Chronobiology, Seoul National University Hospital) ;
  • Park, Kwang Suk (Department of Biomedical Engineering, Seoul National University College of Medicine)
  • 서상원 (서울대학교 공과대학 협동과정 바이오엔지니어링 전공) ;
  • 황수환 (서울대학교 공과대학 협동과정 바이오엔지니어링 전공) ;
  • 윤희남 (서울대학교 공과대학 협동과정 바이오엔지니어링 전공) ;
  • 정다운 (서울대학교 공과대학 협동과정 바이오엔지니어링 전공) ;
  • 최재원 (서울대학교병원 수면의학센터) ;
  • 이유진 (서울대학교병원 수면의학센터) ;
  • 정도언 (서울대학교병원 수면의학센터) ;
  • 박광석 (서울대학교 의과대학 의공학교실)
  • Received : 2014.08.08
  • Accepted : 2014.10.15
  • Published : 2014.10.31
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Abstract

As body postures on bed affects various sleep related diseases, it is considered as important information when monitoring sleeping in daily life. Though there have already been a few approaches to monitor body postures on bed conventionally, the development for simple and unconstrained methods is still needed to realize the long-term daily monitoring. Focusing on the fact that ballistocardiogram changes depending on the body postures on bed, we developed a novel method to estimate body posturesusing extremely simple, film-type ballistocardiogram sensor which is based on polyvinylidene fluoride(PVDF) film. With 10 subjects, we performed two experiments. One was for an estimation test to show that body postures on bed can be estimated by ballistocardiogram, and the other was for a reproducibility test to present the feasibility of ballistocardiogram based body postures monitoring. To estimate body postures on bed, we made an individual template set of body postures by designating one ballistocardiogram (BCG) sample as a template in each postures. Then, we calculated Pearson's correlation coefficients between a sample and each templates and estimated the body posture of the sample by choosing a posture which corresponds to the most significant correlation coefficients. As a result, we estimated body postures on bed with 99.2% accuracy in average and found that the estimation using ballistocardiogram is reproducible.

Keywords

References

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