Browsing by Author "Lin, Pei-Chen"

Now showing 1 - 2 of 2

A NOVEL INDEX OF PHOTOPLETHYSMOGRAPHY BY USING INSTANTANEOUS PULSE RATE VARIABILITY DURING NON-STATIONARY CONDITION
(2015)
Lin, Pei-Chen
;
Huang, Po-Hsun
;
Chang, Chia-Chi
;
Hsu, Hung-Yi
;
Hsiao, Tzu-Chien
Heart rate variability (HRV) and pulse rate variability (PRV) have been widely used as an automatic nervous system (ANS) activities observation. Based on the timescale limitation of heart beat (for HRV) and pulse waveform (for PRV), one method of instantaneous pulse rate variability (iPRV) with photoplethysmography (PPG) had been proposed as a HRV and PRV surrogate during non-stationary condition in frequency domain. In this paper, the examination in time-domain PPG during passive leg raise (PLR) trial was studied. The 24 subjects pre-experiment resulted that iPRV and HRV are positive correlation (r-value = 0.680 +/- 0.099 in baseline; r-value = 0.688 +/- 0.096 in PLR). Furthermore, the iPRV containing much complex intrinsic components on higher frequency bands provides more intrinsic cardiovascular information for further assessment. This proposed examination in time-domain PPG is the possible leading way to more useful indicator for healthcare application.
Highly efficient solar-heat shield based on the bipolaron-assisted PEDOT:PSS thin film
(2020-08-01)
Thakur, Diksha
;
Wu, Jia-Ren
;
Chandel, Anjali
;
Liu, Shih-Yao
;
Lin, Pei-Chen
We report on an efficient solar-heat shield based on the highly transparent PEDOT:PSS thin film, which significantly reduces the temperature from 38.2 degrees C to 33.5 degrees C. To understand the superior solar-heat shielding ability, the modified PEDOT:PSS thin films were investigated by using the transmittance spectra, Raman scattering spectra, atomic-force microscopic (AFM) images and broadband refractive index spectra. The experimental results show that the molecular structure of the PEDOT chains can be manipulated by varying the Brownian motion of PEDOT polymers in the PEDOT:PSS solutions and the spin rate. The lower Brownian motion of PEDOT polymers and the higher spin rate both can change the molecular structure of the PEDOT chains from bended structures (de-doping states) to linear structures (doping states), which simultaneously increase the near-infrared absorption strength and the visible transparency due to the formation of bipolarons.