Predictive Value of Cardiac Magnetic Resonance Imaging-Derived Myocardial Strain for Poor Outcomes in Patients with Acute Myocarditis

이지원,정연주,이지원,이남경,이혜원,김진유,최범성,추기석 대한영상의학회 2017 Korean Journal of Radiology Vol.18 No.4

Objective: To evaluate the utility of cardiovascular magnetic resonance (CMR)-derived myocardial strain measurement for the prediction of poor outcomes in patients with acute myocarditis. Materials and Methods: We retrospectively analyzed data from 37 patients with acute myocarditis who underwent CMR. Left ventricular (LV) size, LV mass index, ejection fraction and presence of myocardial late gadolinium enhancement (LGE) were analyzed. LV circumferential strain (EccSAX), radial strain (ErrSAX) from mid-ventricular level short-axis cine views and LV longitudinal strain (EllLV), radial strain (ErrLax) measurements from 2-chamber long-axis views were obtained. In total, 31 of 37 patients (83.8%) underwent follow-up echocardiography. The primary outcome was major adverse cardiovascular event (MACE). Incomplete LV functional recovery was a secondary outcome. Results: During an average follow-up of 41 months, 11 of 37 patients (29.7%) experienced MACE. Multivariable Cox proportional hazard regression analysis, which included LV mass index, LV ejection fraction, the presence of LGE, EccSAX, ErrSAX, EllLV, and ErrLax values, indicated that the presence of LGE (hazard ratio, 42.88; p = 0.014), together with ErrLax (hazard ratio, 0.77 per 1%, p = 0.004), was a significant predictor of MACE. Kaplan-Meier analysis demonstrated worse outcomes in patient with LGE and an ErrLax value ≤ 9.48%. Multivariable backward regression analysis revealed that ErrLax values were the only significant predictors of LV functional recovery (hazard ratio, 0.54 per 1%; p = 0.042). Conclusion: CMR-derived ErrLax values can predict poor outcomes, both MACE and incomplete LV functional recovery, in patients with acute myocarditis, while LGE is only a predictor of MACE.

Simultaneous Assessment of Left Ventricular Function and Coronary Artery Anatomy by Third-generation Dual-source Computed Tomography Using a Low Radiation Dose

이지원,Kyung Jin Nam,김진유,정연주,이지원,So Min Park,Soo Jin Lim,추기석 한국심초음파학회 2020 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.28 No.1

BACKGROUND: To assess left ventricular function and coronary artery simultaneously by third-generation dual-source computed tomography (CT) using a low radiation dose. METHODS: A total of 48 patients (36 men, 12 women; mean age 57.0 ± 9.5 years) who underwent both electrocardiography-gated cardiac CT angiography (CCTA) using 70–90 kVp and echocardiography were included in this retrospective study. The correlation between left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), and left ventricular ejection fraction (LVEF) measured using CCTA and echocardiography was determined. The quality of coronary artery images was analyzed using a 4-point scale (1, excellent; 4, poor). The effective radiation dose of CCTA was calculated. RESULTS: Mean heart rate during the CT examination was 59.9 ± 9.9 bpm (range 38–79) and the body mass index of 48 patients was 24.5 ± 2.6 kg/m2 (range 17.0–29.4). LVEDV, LVESV, and LVEF measured using CCTA and echocardiography demonstrated a fair to moderate correlation (Pearson correlation coefficient: r = 0.395, p = 0.005 for LVEDV; r = 0.509. p < 0.001 for LVESV; r = 0.551, p < 0.001 for LVEF). Average image quality score of coronary arteries was 1.0 ± 0.1 (range 1–2). A total of 99.0% (783 of 791) of segments had an excellent image quality score, and 1.0% (8 of 791) of segments had a good score. Mean effective radiation dose was 2.2 ± 0.7 mSv. CONCLUSIONS: Third-generation dual-source CT using a low tube voltage simultaneously provides information regarding LV function and coronary artery disease at a low radiation dose. It can serve as an alternative option for functional assessment, particularly when other imaging modalities are inadequate.

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이지원 더스쿠프 2020 더스쿠프 Vol.- No.391

[Company Insight] SPC삼립 | 새 브랜드 론칭_에그슬럿, 쉐이크쉑처럼 뜰까

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[Market Analysis] 이커머스 진검승부 4社 4色_저기 저 산에 깃발을 꽂아라

이지원 더스쿠프 2020 더스쿠프 Vol.- No.388

여름철 菜蔬 비가림 栽培 技術

李志遠 韓國施設園藝硏究會 1991 施設園藝硏究 Vol.4 No.2

비대칭 가상현실에서의 현존감을 위한 HMD 사용자와 Non-HMD 사용자간 몰입형 상호작용에 관한 연구

이지원,김민규,김진모 (사)한국컴퓨터그래픽스학회 2018 컴퓨터그래픽스학회논문지 Vol.24 No.3

This study proposes an immersive interaction optimized for the user’s experience environment to provide an improved presence for both HMD and Non-HMD users in the asymmetric virtual reality (VR) environment. The core of the proposed immersive interaction is to distinguish the differences of the asymmetric environment between the HMD and Non-HMD users and present the optimized interaction to the user. And, in order to increase the presence by providing improved immersion in the asymmetric virtual reality environment given to each user, we design the walking interaction to improve the immersion of space for the HMD users, a hand-based interface that improves immersion by fully understanding and managing the situation through direct control. Finally, through the experiment using questionnaire, it is verified that the immersive interaction provides all users with an enhanced presence and specialized experience in each environment experience. Through these processes, we confirmed that the Non-HMD user can be immersed in an asymmetric virtual reality using by proposed interaction as participant rather than assistant with HMD user. 본 연구는 비대칭 가상현실 환경에 존재하는 HMD 사용자와 Non-HMD 사용자 모두에게 향상된 현존감을 제공하기 위하여 사용자의 체험 환경에 최적화된 몰입형 상호작용을 제안한다. 제안하는 몰입형 상호작용의 핵심은 HMD 사용자와 Non-HMD 사용자 사이의 비대칭 환경의 차이를 구분하여 사용자에게 최적화된 상호작용을 제시하는 것이다. 그리고 사용자 각각에게 주어지는 비대칭 가상현실 환경에서 향상된 몰입을 제공하여 현존감을 높이기 위하여 HMD 사용자에게는 공간의 몰입을 향상시키는 걷기 상호작용을, Non-HMD 사용자에게는 직접적인 조작을 통해 상황을 전체적으로 이해하고 관리함으로써 몰입을 향상시키는 손 기반 인터페이스를 설계한다. 마지막으로 몰입형 상호작용을 통해 모든 사용자가 향상된 현존감을 제공받으면서 동시에 각각의 체험에 환경에 특화된 경험을 하였음을 설문실험을 통해 검증한다. 이러한 과정들을 통하여 제안한 상호작용이 비대칭 가상현실에서 Non-HMD 사용자도 보조자가 아닌 참가자로써 HMD 사용자와 함께 몰입할 수 있음을 확인한다.

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[Current Economy] 쿠팡 발목 잡은 불통_귀를 닫으면 닫을수록 터질지어다

이지원 더스쿠프 2021 더스쿠프 Vol.- No.448

종합목록DB를 이용한 국내 대학도서관 서양서 소장 실태 분석

이지원,이재윤 한국정보관리학회 2018 정보관리학회지 Vol.35 No.1

This study analyzed Korean university libraries’ holdings of Western language books published in 2003 and 2013 using the KERIS union catalog with a view to investigating the changes in collection development of Western language books in the libraries. To do that, new collection indexes - holding h-index, CUI (Collection Uniqueness Index), and CCHR (Common Collection Holding Ratio) - were suggested, and they were used with basic indexes such as the number of titles, the number of books, and the number of books per title. The analysis reveals that compared to those published in 2003, the number of titles was decreased by 16.1% with those published in 2013, and the number of books dropped more sharply, by 42.2%. Also, in 2013, CCHR was decreased while CUI was increased. In terms of subject, among DDC main classes, 0XX (Generalities) showed the greatest decrease rate in both the number of titles and books because of the radical reduction of computer-related books. In terms of each library’s holdings, the number of Western language books held by top libraries has been increased with those published in 2013. 본 연구는 국내 대학도서관 서양서 장서 개발의 변화를 살펴보기 위해 2003년과 2013년에 출판된 서양서 소장 실태를 KERIS 종합목록을 통해 분석하였다. 이를 위해 새로운 장서 지표로 소장 h-지수, 장서 고유성 지수, 그리고 공통장서 확보율을 제안하고 기본 지표인 종수 및 책수, 그리고 종당 책수와 함께 활용하였다. 분석 결과 2003년에 비해서 2013년에 출판된 서양서의 전체 소장 종수는 16.1% 감소하고 소장 책수는 42.2% 감소하여 소장 책수가 더 크게 감소하였다. 여러 도서관이 공통적으로 소장하는 공통 장서, 또는 기본 장서의 규모를 나타내는 공통장서 확보율은 줄어들었고, 장서고유성은 증가하였다. DDC 주류 중에서는 컴퓨터 관련 도서가 급감한 0XX(총류) 분야의 감소율이 가장 컸다. 도서관별 장서량 측면에서는 2003년에 비해서 2013년 출판도서의 경우에 상위 도서관이 더욱 과점하는 빈익빈 부익부 현상이 심화되었다.