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Contributors of the Severity of Airflow Limitation in COPD Patients
( Yoonki Hong ),( Eun Jin Chae ),( Joon Beom Seo ),( Ji-Hyun Lee ),( Eun-Kyung Kim ),( Young Kyung Lee ),( Tae-Hyung Kim ),( Woo Jin Kim ),( Jin Hwa Lee ),( Sang-Min Lee ),( Sangyeub Lee ),( Seong Yon 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.1
Although airway obstruction in chronic obstructive pulmonary disease (COPD) is due to pathologic processes in both the airways and the lung parenchyma, the contribution of these processes, as well as other factors, have not yet been evaluated quantitatively. We therefore quantitatively evaluated the factors contributing to airflow limitation in patients with COPD. The 213 COPD patients were aged >45 years, had smoked >10 pack-years of cigarettes, and had a post-bronchodilator forced expiratory volume in one second (FEV1)/forced vital capacity (FVC) <0.7. All patients were evaluated by medical interviews, physical examination, spirometry, bronchodilator reversibility tests, lung volume, and 6-minute walk tests. In addition, volumetric computed tomography (CT) was performed to evaluate airway wall thickness, emphysema severity, and mean lung density ratio at full expiration and inspiration. Multiple linear regression analysis was performed to identify the variables independently associated with FEV1 - the index of the severity of airflow limitation. Multiple linear regression analysis showed that CT measurements of mean lung density ratio (standardized coefficient β=?0.46; p<0.001), emphysema severity (volume fraction of the lung less than ?950 HU at full inspiration; β=?0.24; p<0.001), and airway wall thickness (mean wall area %; β=?0.19, p=0.001), as well as current smoking status (β=?0.14; p=0.009) were independent contributors to FEV1. Mean lung density ratio, emphysema severity, and airway wall thickness evaluated by volumetric CT and smoking status could independently contribute to the severity of airflow limitation in patients with COPD.
스포츠 브랜드 기업의 SNS 정보특성, 미디어 및 브랜드 인게이지먼트, 구매의도의 구조적 관계
전윤기(Yoonki Chun),이정학(Jeoung-Hak Lee),김민준(Min-Jun Kim),고세진(Se-Jin Ko) 한국사회체육학회 2023 한국사회체육학회지 Vol.- No.93
Purpose: The purpose of this study is to examine the relationship amogn sport brands’ social media information traits, media and brand engagement, and consumers’ purchase intentions. Method: The study targeted consumers who have experienced sport brands’ social media and collected data through online surveys (N=546). The surveys included 28 maesurement items. The data were analyzed using SPSS and AMOS software, and frequency, reliability ,and correlation analysis were performed. Further, confirmatory factor analysis and structural equation modeling were used to test the hypotheses. Results: First, the traits of entertainment and accessibility had a gsinificant positive effect on media engagement. Second, the quality of information trait had a signiicfant positive effect on brand engagement. Third, both the quality of information and accessibility trait shad a significant positive effect on consumers’ purchase intention. Fourth, media engagement had a positive efefct on brand engagement. Fifth, media engagement had a positive effect on purchase intention. Sixth, brand engagement had a significant positive effect on purchase intention. Seventh, the relationship between sport brands’ social media information traits and consumers’ purchase intention was mediated both indviidually and serially by media and brand engagement. Conclusion: Overall, the results of this study suggest that sport brand se’fforts in providing quality content on their social media platforms can generate positive enggaement with customers and may lead to purchase intentions. Further implications and future directions are discussed.
Comparison of Clinico-Physiologic and CT Imaging Risk Factors for COPD Exacerbation
Yoo, Jung-Wan,Hong, Yoonki,Seo, Joon Beom,Chae, Eun Jin,Ra, Seung Won,Lee, Ji-Hyun,Kim, Eun Kyung,Baek, Seunghee,Kim, Tae-Hyung,Kim, Woo Jin,Lee, Jin Hwa,Lee, Sang-Min,Lee, Sangyeub,Lim, Seong Yong,Sh The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.12
<P>To date, clinico-physiologic indices have not been compared with quantitative CT imaging indices in determining the risk of chronic obstructive pulmonary disease (COPD) exacerbation. We therefore compared clinico-physiologic and CT imaging indices as risk factors for COPD exacerbation in patients with COPD. We retrospectively analyzed 260 COPD patients from pulmonary clinics at 11 hospitals in Korea from June 2005 to November 2009 and followed-up for at least one year. At the time of enrollment, none of these patients had COPD exacerbations for at least 2 months. All underwent clinico-physiologic and radiological evaluation for risk factors of COPD exacerbation. After 1 yr, 106 of the 260 patients had at least one exacerbation of COPD. Multiple logistic regression analysis showed that old age, high Charlson Index, and low FEV<SUB>1</SUB> were significant in a clinico-physiologic model, with C-statistics of 0.69, and that increased age and emphysema index were significant in a radiologic model, with C-statistics of 0.64. The difference between the two models was statistically significant (<I>P</I> = 0.04 by bootstrap analysis). Combinations of clinico-physiologic risk factors may be better than those of imaging risk factors in predicting COPD exacerbation.</P>
장유리(Yuri Jang),민윤기(Yoonki Min) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
PIN(Personal Identification Number)은 과거부터 금융거래에서 개인을 인증하는 방법으로 많이 사용되어 왔으며, 아직까지 사용자에게 가장 익숙한 인증 방식이다. 그러나 PIN 인증 방식은 모바일 특성상 훔쳐보기(Shoulder-surfing)에 취약하며, PIN 번호만 알고 있다면 누구든지 접근이 가능하다는 단점이 있다. 따라서 본 연구는 맥락 단서효과(contextual cueing effect)를 활용하여 비사용자의 접근이 불가능한 새로운 PIN 인증시스템의 실현 가능성에 대해 알아보고자 하였다.