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PET/PTT/Rayon 스테이플 혼방직물의 역학적 특성
이대훈,최규락,나미희,차희철,Lee, Dae-Hoon,Choi, Kue-Lak,Na, Mi-Hee,Cha, Hee-Chul 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.2
The mechanical properties and strain at applied loads for PET/PTT (polyester/poly trimethylene terephthalate)/rayon staple blended fabrics, PET/rayon blended fabrics, and PET/rayon containing PU fabrics were studied. The result of the research shows that PET/PTT/rayon staple blended fabrics have higher bending and shear properties than other fabrics in cases regarding the weft direction. Elastic recovery above a 30% strain of PET/PTT/rayon staple blended fabrics is larger than that of other fabrics. PET/PTT/rayon staple blended fabrics are easily extensible at the small as well as the large deformation region.
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동잡음을 가진 PPG 센서에서의 산소포화도 측정 알고리즘
장성진 ( Seong-jin Jang ),최규락 ( Kue-lak Choi ),박근혜 ( Keun-hae Park ),김정도 ( Jeong-do Kim ) 한국센서학회 2018 센서학회지 Vol.27 No.3
Pulse oximetry is a non-invasive method for monitoring how much oxygenated hemoglobin is present in the blood. The principle of pulse oximetry is based on the red infrared light adsorption characteristics of oxygenated and deoxygenated hemoglobin. Even through the convenience of a pulse oximeter, its weak signal-to-noise ratio against motion artifacts and low perfusion makes it difficult to be accepted by execs devices. Several researchers have suggested the use of an adaptive noise cancellation (ANC) algorithm. They have demonstrated that ANC is feasible for reducing the effects of motion artifacts. Masimo Corporation developed a discrete saturation transformation (DST) algorithm that uses a reference signal and ANC. In commercial devices, it is very hard to escape it because Masimo’s patents are very powerful and a better method is yet to be developed. This study proposes a new method that can measure noise saturation as well as accurate oxygen saturation from signals with high motion artifacts without using ANC and DST. The proposed algorithm can extract a normal signal without noise from a signal with motion artifacts. The reference signal from a pulse oximeter simulator was used for the evaluation of our proposed algorithm and achieved good results.
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