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3차원 인체 스캔 데이터와 이중에너지엑스선흡수기(DXA)데이터를 이용한 XGBoost기반 비만 판단 방법론 제안
전승진(Seungjin Jeon),장지원(Jiwon Jang),김민지(Minji Kim),손민준(Minjoon Sohn),김수빈(Soobin Kim),염세경(Sekyoung Youm) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
건강에 대한 관심이 높아지면서, 정확하게 비만을 진단하고 이를 통해 관리하려는 노력이 확산되고 있다. 통상적으로 비만을 관리하기 위해 BMI 지수를 사용하지만 BMI지수는 다양한 형태의 비만을 판단하기에 부적합하다고 보고되고 있다. BMI의 한계점을 극복하기 위해 다양한 신체 치수와 비만의 관계를 찾는 연구들이 시도되고 있다. 이에 본 연구는 3차원 인체 스캐너와 DXA데이터를 동시에 수집하고 트리계열의 머신러닝 모델인 XGBoost을 기반으로 비만 판단 방법론을 제안한다. XGBoost를 통하여 비만 판단 분류 모델링을 진행하였으며, 이 때 블랙박스 설명 방법론중 하나인 SHAP와 Permutation Importance를 사용하여 비만을 판단하기 위한 중요 신체 치수가 무엇인지 탐색하고, 분류 모델의 성능을 향상 시켰다. 본 연구를 통해 기존의 비만 판단 지표였던 BMI나 단순히 한두개의 신체 치수를 활용하는 연구에서 벗어나 정확한 비만 판단 지표로 머신러닝 기반의 방법론이 사용될 수 있는 가능성을 탐색해 보았다.
Factors Associated with Insomnia among the Elderly in a Korean Rural Community
WooJung Kim,Wontak Joo,Jiwon Baek,SungYun Sohn,Namkoong Kee,Yoosik Youm,HyeonChang Kim,YeongRan Park,SangHui Chu,EunLee 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.4
Objective-Sleep disturbance is common in the elderly, which is result from multi-factorial causes encompassing socio-demographic, behavioral, and clinical factors. We aimed to identify factors associated with insomnia among the elderly in a rural community in South Korea, a country with a rapidly growing aged population. Methods-This cross-sectional study used the data from the second wave of the Korean Social life, Health and Ageing Project, which is a cohort study of individuals living in a typical rural community in South Korea. Socio-demographic, behavioral, and clinical characteristics were obtained through face-to-face interviews. Various factors suspected to be associated with insomnia were compared between elderly participants with and without insomnia, and multiple logistic regression analyses were conducted to identify independent risk factors for insomnia. Results-We found that 32.4% of 509 participants (72.8±7.7 years old) had insomnia. Female sex [odds ratio (OR)=2.19], low education level (OR=2.44), current smoking (OR=2.26), number of chronic diseases (OR=2.21 for 2-3 chronic diseases; OR=2.06 for 4 or more chronic diseases), and depression (OR=2.53) were independently associated with insomnia. Conclusion-We found that sex, education, chronic disease, and depression independently increase the risk of insomnia of the elderly in a Korean rural community. To overcome the elderly’s insomnia, interventions should target modifiable factors such as depression. To promote active aging, longitudinal studies of factors associated with insomnia among the elderly should be performed in different regions and communities.
Jae-Jin Lyu,Jiwon Sohn,Hyang Yul Kim,Seung Hee Lee IEEE 2007 Journal of display technology Vol.3 No.4
<P>This paper reviews the recent trends on super-patterned vertical alignment (S-PVA) and fringe-field switching (FFS) technologies for liquid crystal display (LCD)-television (TV) applications. For PVA mode, Samsung originally announced S-PVA technology in 2004 to enhance off-axis viewing quality of conventional PVA mode. S-PVA is a new technology which enables screen quality advantages over super-in plane switching (S-IPS) and multi-domain VA (MVA), including high transmittance, >2300:1 contrast ratio, and wide viewing angle with no off-axis image inversion. This paper explores and updates Samsung's latest developments toward its goal of ultimate LCD-TV performance. For FFS mode, the technology appeared in 1998 by HYDIS and now it has been commercialized in all kinds of display applications, implying its technical importance. This paper reviews recent developments and performance of LCD-TV using the FFS mode based on published papers and our knowledge.</P>