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PVDF 필름 기반 센서를 이용한 정상인 및 폐쇄성 수면 무호흡증 환자에서의 무구속적인 렘 수면 모니터링
황수환,윤희남,정다운,서상원,이유진,정도언,박광석,Hwang, Su Hwan,Yoon, Hee Nam,Jung, Da Woon,Seo, Sang Won,Lee, Yu Jin,Jeong, Do-Un,Park, Kwang Suk 대한의용생체공학회 2014 의공학회지 Vol.35 No.3
In sleep monitoring system, polysomnography (PSG) is the gold-standard but previous studies revealed that attaching numerous amount of sensors disturb sleep during the test which is the fundamental disadvantage of PSG. We suggest an unconstrained rapid-eye-movement (REM) sleep monitoring method measured with polyvinylidene (PVDF) film-based sensor for the normal and the obstructive sleep apnea (OSA) patients. Nine normal subjects and seventeen OSA patients have participated in the study. During REM sleep, rate and variability of respiration are known to be greater than in other sleep stages. Based on this phenomena, respiratory signals of participants were unconstrainedly measured using the PVDF-based sensor with the PSG and REM sleep were extracted from the average rate and variability of respiration. In epoch-by-epoch REM sleep detection, proposed method classified REM sleep with an average sensitivity of 72.3%, specificity of 92.5%, accuracy of 88.9%, and kappa statistic of 0.60 compared to the results of PSG. Student's t-test showed no significant difference between the results of normal and OSA group. This method is potentially applicable to REM sleep detection in homing environment or ambulatory monitoring.
황수환(Su-Hwan Hwang),이광노(Kwang-Noh Lee),박상도(Sang-Do Park),편종권(Jong-Kweon Pyun) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For driving, passenger has experienced various types of road situation; straight/curved roads, paved/unpaved roads. Long-time driving exposes passenger to centrifugal force and vertical vibration that cause driving fatigue. In this paper, a integrated seat control system including several air-bladders and sensor signals (steering angle, speed, acceleration) is investigated. The system control the pressure of seat side bolsters's bladders in the curved roads and the pressure of seat cushion's bladders according to road roughness. The purpose of the control system is to improve the ride comfort of seat.
일반논문 : 근대기(近代期) 일본인(日本人) 이주농촌(移住農村)의 형성(形成)과 이주농촌가옥(移住農村家屋) -부산(釜山) 강서구(江西區) 대저지역(大渚地域)을 중심(中心)으로-
황수환 ( Su Hwan Hwang ),김기수 ( Ki Soo Kim ) 東亞大學校附設 石堂傳統文化硏究院 2011 石堂論叢 Vol.0 No.51
부산 강서구 대저지역의 일본인 이주농촌은 근대기 일본의 인구과잉, 식량부족 문제 해결과 대륙으로 영향력을 확대해 나가려는 제국주의 정책의 일환으로 이주해 온 일본인들에 의해 형성되었다. 이들은 동양척식주식회사를 통한 정책적 비호 아래 대규모 토지를 경영하는 대지주형 농업을 경영하였다. 대저지역은 비옥한 농토임에도 불구하고 고질적 문제였던 홍수에 의한 자연재해를 입고 있었다. 이에 대저수리조합과 초량토목출장소에 의한 토목공사, 치수공사 및 수로개설 공사로 인하여 보다 안정적인 이주농촌을 형성하게 되었으며 이들 사업들은 이주농촌 형성과 건축적 특성에 중요한 역할을 하고 있다. 당시 형성된 이주농촌 가옥은 많은 변형과 함께 관리상태 불량으로 훼손 상태가 심각한 수준이며 현재 원형확인이 가능한 41채만이 현존하고 있다. 이 가옥들을 통해 근대기 일식주택이 한국인의 생활습관이나 공간부족 등의 문제로 인하여 많은 개·보수 과정을 거치며 변형되어 가는 모습을 확인할 수 있다. The Japanese migrant farming village in the Daejeo region in Gangseo-gu, Busan, was formed by the Japanese, who emigrated from Japan to Korea as a solution to the problems of overpopulation and food shortages in Japan and as part of the imperialist policy of extending their influence to the continent. Under the protection of policy through Oriental Development Company, they managed farming lands on a large scale. Although Daejeo was a fertile farmland, the residents in the area faced natural disasters, mainly floods. Accordingly, a more stable migrant farming village was formed through civil engineering works, embankment works and construction of watercourse by Daejeo Irrigation Association and Choryang Civil Engineering Company, and such projects played an important role in the formation of the migrant farming village and architectural characteristics. The houses of the village that were built at the time are now severely deformed and damaged due to poor management and there remain only 41 houses, whose form can be identified. From these houses, one can confirm that the modern Japanese houses are changing through the process of numerous renovations and repairs, which were conducted because of the lifestyle of Koreans or lack of space.
윤희남,황수환,정다운,이유진,정도언,박광석,Yoon, Hee Nam,Hwang, Su Hwan,Jung, Da Woon,Lee, Yu Jin,Jeong, Do-Un,Park, Kwang Suk 대한의용생체공학회 2014 의공학회지 Vol.35 No.6
The objective of this research is to develop an automatic algorithm based on electrocardiogram (ECG) to estimate slow-wave sleep (SWS). An algorithm is based on 7 indices extracted from heart rate on ECG which simultaneously recorded with standard full night polysomnography from 31 subjects. Those 7 indices were then applied to independent component analysis to extract a feature that discriminates SWS and other sleep stages. Overall Cohen's kappa, accuracy, sensitivity and specificity of the algorithm to detect 30s epochs of SWS were 0.52, 0.87, 0.70 and 0.90, respectively. The automatic SWS detection algorithm could be useful combining with existing REM and wake estimation technique on unattended home-based sleep monitoring.
PVDF 필름 기반 센서를 이용한 무구속적인 누운 자세 추정
서상원,황수환,윤희남,정다운,최재원,이유진,정도언,박광석,Seo, Sangwon,Hwang, Su Hwan,Yoon, Hee Nam,Jung, Da Woon,Choi, Jae Won,Lee, Yu Jin,Jeong, Do-Un,Park, Kwang Suk 대한의용생체공학회 2014 의공학회지 Vol.35 No.5
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.
김석환(Seok-Hwan Kim),황수환(Su-Hwan Hwang),이광노(Kwang-Noh Lee),평종권(Jong-Kweon Pyun),김경민(Kyung Min Kim),사성진(Sungjin Sah),최형연(Hyung Yun Choi) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
New human body models have been developed with recent anthropometry have for riding comfort simulation. External geometry of the models was acquired from the 3 dimensional whole body laser scanning of recruited volunteers in a driving position. The selection criteria for volunteers with standard size and shape were derived from a statistical factor analysis of the SizeUSA database. As a practical application of the model in a design process, comfortable driving postures were constructed by using the Cascade Prediction Model (CPM) which takes into account both, interior package layout and the driver’s anthropometry.