2014 Korean Guidelines for Appropriate Utilization of Cardiovascular Magnetic Resonance Imaging: A Joint Report of the Korean Society of Cardiology and the Korean Society of Radiology

윤연이,홍유진,김형관,김정아,나진오,양동현,김영진,최의영 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.6

Cardiac magnetic resonance (CMR) imaging is now widely used in several fields of cardiovascular disease assessment due to recent technical developments. CMR can give physicians information that cannot be found with other imaging modalities. However, there is no guideline which is suitable for Korean people for the use of CMR. Therefore, we have prepared a Korean guideline for the appropriate utilization of CMR to guide Korean physicians, imaging specialists, medical associates and patients to improve the overall medical system performances. By addressing CMR usage and creating these guidelines we hope to contribute towards the promotion of public health. This guideline is a joint report of the Korean Society of Cardiology and the Korean Society of Radiology.

Left Atrial Mechanical Function and Stiffness in Patients with Paroxysmal Atrial Fibrillation

윤연이,김현진,김성애,김성환,박재형,박경하,최성훈,김민규,김현숙,조구영 한국심초음파학회 2012 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.20 No.3

Background: Abnormalities in the left atrial (LA) structure and function may develop in patients with paroxysmal atrial fibrillation (AF). We sought to determine the contribution of LA mechanical function, including LA stiffness, to AF by comparing patients with paroxysmal AF with normal control subjects, and to evaluate whether LA mechanical function and stiffness are related with the structural changes of LA. Methods: Sixty-four paroxysmal AF patients (57 ± 13 years, 59% male) were studied, using a speckle tracking echocardiography,and were compared with 34 age-, gender-, and left ventricular (LV) mass-matched controls (53 ± 14 years, 61% male). LA volume indices, expansion index for reservoir function, active emptying fraction for contractile function, mitral annular velocities,and global longitudinal LA strain were measured. The ratio of E/e’ to LA strain was used as an index of LA stiffness. Results: Patients with paroxysmal AF had similar LV volume indices, ejection fraction, and diastolic function, when compared with that of the normal controls. However, paroxysmal AF patients showed increased LA volume indices and decreased LA reservoir function, but similar contractile function. LA stiffness was increased in patients with paroxysmal AF than in the control subjects (0.40 ± 0.25 vs. 0.29 ± 0.10, p = 0.002), and was related with LA volume indices and reservoir function. Conclusion: Patients with paroxysmal AF have decreased LA reservoir function and increased stiffness, in comparison with that of the control subjects. LA stiffness was significantly related with LA volume indices and reservoir function. LA stiffness can be used for the assessment of LA function in patients with paroxysmal AF.

64열 심장 다절편 CT에서 발견되는 비심장 소견: 흉부 CT와의 비교

윤연이,전은주,최의근,조영진,이원재,최상일,최동주,장혁재 대한심장학회 2008 Korean Circulation Journal Vol.38 No.5

Background and Objectives: Multi-detector CT (MDCT) is becoming more commonly used as a diagnostic tool for various cardiac diseases, and this modality can also incidentally detect a significant number of non-cardiac findings during cardiac work-ups. The objectives of this study were to evaluate the incidence of non-cardiac findings during cardiac MDCT and to compare them with chest CT. Subjects and Methods: We enrolled 1,007 consecutive subjects (mean age: 49±10 years, males: 63%) who underwent both cardiac and chest CT (64-slice MDCT) as a part of a routine health check-up. The subjects were evaluated for the incidence of non-cardiac findings and the therapeutic consequences according to the CT protocols during the mid-term follow-up (average length of mid-term follow-up: 533±39 days). Results: Eight hundred sixty incidental non-cardiac findings were identified in 627 patients (62%) with cardiac CT. Forty-three subjects (4%) had clinically significant lesions that required additional diagnostic work-up or radiological follow-up, and these lesions were 23 cases of non-calcified nodule, 2 cases of ground glass opacity, 6 cases of pneumonia, 1 case of active tuberculosis, 2 cases of focal bronchiolitis, 3 cases of arterial lesion, 1 case of liver cirrhosis and 5 cases of extra-pulmonary masses. Five subjects (0.5%), including 2 cases (0.2%) of malignancy, had therapeutic consequences during their follow-up. Compared with chest CT, 68% (40/59) of the significant intrathoracic lesions and 67% (4/6) of the intrathoracic lesions with therapeutic consequences were documented by cardiac CT. Conclusion: In the present study, 4% of the asymptomatic patients who underwent cardiac MDCT were found to have significant non-cardiac findings that required further work-up. To avoid missing a number of clinically important findings, physicians who analyze cardiac MDCT scans should carefully evaluate not only the heart, but all the other organs that are within the scan range. Background and Objectives: Multi-detector CT (MDCT) is becoming more commonly used as a diagnostic tool for various cardiac diseases, and this modality can also incidentally detect a significant number of non-cardiac findings during cardiac work-ups. The objectives of this study were to evaluate the incidence of non-cardiac findings during cardiac MDCT and to compare them with chest CT. Subjects and Methods: We enrolled 1,007 consecutive subjects (mean age: 49±10 years, males: 63%) who underwent both cardiac and chest CT (64-slice MDCT) as a part of a routine health check-up. The subjects were evaluated for the incidence of non-cardiac findings and the therapeutic consequences according to the CT protocols during the mid-term follow-up (average length of mid-term follow-up: 533±39 days). Results: Eight hundred sixty incidental non-cardiac findings were identified in 627 patients (62%) with cardiac CT. Forty-three subjects (4%) had clinically significant lesions that required additional diagnostic work-up or radiological follow-up, and these lesions were 23 cases of non-calcified nodule, 2 cases of ground glass opacity, 6 cases of pneumonia, 1 case of active tuberculosis, 2 cases of focal bronchiolitis, 3 cases of arterial lesion, 1 case of liver cirrhosis and 5 cases of extra-pulmonary masses. Five subjects (0.5%), including 2 cases (0.2%) of malignancy, had therapeutic consequences during their follow-up. Compared with chest CT, 68% (40/59) of the significant intrathoracic lesions and 67% (4/6) of the intrathoracic lesions with therapeutic consequences were documented by cardiac CT. Conclusion: In the present study, 4% of the asymptomatic patients who underwent cardiac MDCT were found to have significant non-cardiac findings that required further work-up. To avoid missing a number of clinically important findings, physicians who analyze cardiac MDCT scans should carefully evaluate not only the heart, but all the other organs that are within the scan range.

심혈관 자기공명영상 사용에 대한 2014 권고안: 대한심장학회와 대한영상의학회 공동 보고서

윤연이,홍유진,김형관,나진오,양동현,김영진,최의영 대한영상의학회 2015 대한영상의학회지 Vol.72 No.4

The use of cardiac magnetic resonance (CMR) imaging is increasing for the assessment of certain cardiovascular diseases, due to recent technical developments. CMR can give physicians information that cannot be found with other imaging modalities. However, there has been no guideline for the use of CMR in Korean people. Therefore, we have prepared a Korean guideline for the appropriate utilization of CMR to guide Korean physicians, imaging specialists, medical associates, and patients to improve the overall performances in medical system. By addressing CMR usage and creating these guidelines, we hope to contribute to the promotion of public health. This guideline is a joint report of the Korean Society of Cardiology and the Korean Society of Radiology. 최근 기술적 발전에 힘입어 자기공명영상의 사용이 꾸준히 증가하고 있으며 자기공명영상을 통한 심장질환 진단의 비율이 높아지고 있으나 현재 심장질환에서 자기공명영상의 적절한 사용에 대한 진료지침이 없는 실정이다. 이 권고안은 다양한 심장질환에서 심장 자기공명영상의 적절한 사용을 위하여 근거에 기반한 우리나라 실정에 맞는 권고안을 마련함으로써 심장 자기공명영상을 이용하는 의사와 환자에게 도움을 주고자 개발되었다. 이 권고안은 대한심장학회와 대한영상의학회가 공동 집필하였다.

2014 Korean Guidelines for Appropriate Utilization of Cardiovascular Magnetic Resonance Imaging: A Joint Report of the Korean Society of Cardiology and the Korean Society of Radiology

윤연이,홍유진,김형관,김정아,나진오,양동현,김영진,최의영 대한심장학회 2014 Korean Circulation Journal Vol.44 No.6

Cardiac magnetic resonance (CMR) imaging is now widely used in several fields of cardiovascular disease assessment due to recent technicaldevelopments. CMR can give physicians information that cannot be found with other imaging modalities. However, there is no guidelinewhich is suitable for Korean people for the use of CMR. Therefore, we have prepared a Korean guideline for the appropriate utilizationof CMR to guide Korean physicians, imaging specialists, medical associates and patients to improve the overall medical system performances. By addressing CMR usage and creating these guidelines we hope to contribute towards the promotion of public health. This guideline isa joint report of the Korean Society of Cardiology and the Korean Society of Radiology. Cardiac magnetic resonance (CMR) imaging is now widely used in several fields of cardiovascular disease assessment due to recent technicaldevelopments. CMR can give physicians information that cannot be found with other imaging modalities. However, there is no guidelinewhich is suitable for Korean people for the use of CMR. Therefore, we have prepared a Korean guideline for the appropriate utilizationof CMR to guide Korean physicians, imaging specialists, medical associates and patients to improve the overall medical system performances. By addressing CMR usage and creating these guidelines we hope to contribute towards the promotion of public health. This guideline isa joint report of the Korean Society of Cardiology and the Korean Society of Radiology.

Current Roles and Future Applications of Cardiac CT: Risk Stratification of Coronary Artery Disease

윤연이,임태환 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.1

Cardiac computed tomography (CT) has emerged as a noninvasive modality for the assessment of coronary artery disease (CAD), and has been rapidly integrated into clinical cares. CT has changed the traditional risk stratification based on clinical risk to image-based identification of patient risk. Cardiac CT, including coronary artery calcium score and coronary CT angiography, can provide prognostic information and is expected to improve risk stratification of CAD. Currently used conventional cardiac CT, provides accurate anatomic information but not functional significance of CAD, and it may not be sufficient to guide treatments such as revascularization. Recently, myocardial CT perfusion imaging, intracoronary luminal attenuation gradient, and CT-derived computed fractional flow reserve were developed to combine anatomical and functional data. Although at present, the diagnostic and prognostic value of these novel technologies needs to be evaluated further, it is expected that all-in-one cardiac CT can guide treatment and improve patient outcomes in the near future.

해저매설형 음향센서의 특징을 고려한 PHM 적용방안 연구

윤연아,김경록,최영원,최한웅 한국신뢰성학회 2022 한국신뢰성학회 학술대회논문집 Vol.2022 No.11

SHAP를 활용한 중요변수 파악 및 선택에 따른 잔여유효수명 예측 성능 변동에 대한 연구

윤연아(Yeon Ah Yoon),이승훈(Lee Seung Hoon),김용수(Yong Soo Kim) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.4

Recently, the importance of preventive maintenance has been emerging since failures in a complex system are automatically detected due to the development of artificial intelligence techniques and sensor technology. Therefore, prognostic and health manage-ment (PHM) is being actively studied, and prediction of the remaining useful life (RUL) of the system is being one of the most important tasks. A lot of researches has been conducted to predict the RUL. Deep learning models have been developed to improve prediction performance, but studies on identifying the importance of features are not carried out. It is very meaningful to extract and interpret features that affect failures while improving the predictive accuracy of RUL is important. In this paper, a total of six popular deep learning models were employed to predict the RUL, and identified important variables for each model through SHAP (Shapley Additive explanations) that one of the explainable artificial intelligence (XAI). Moreover, the fluctuations and trends of prediction performance according to the number of variables were identified. This paper can suggest the possibility of explainability of various deep learning models, and the application of XAI can be demonstrated. Also, through this proposed method, it is expected that the possibility of utilizing SHAP as a feature selection method.

캐비닛 엑스선 검색장비 이미지품질평가 고도화 방안 연구

윤연아 ( Yeon Ah Yoon ),정진형 ( Jin Hyeong Jung ),김용수 ( Yong Soo Kim ) 한국품질경영학회 2021 품질경영학회지 Vol.49 No.1

Purpose: This study proposes methods and procedures for evaluating imaging security systems quality of cabinet x-ray screening system to enhance performance certification technology. Also, conducted a comparative analysis of the literature of test-kit for imaging security quality evaluation. Methods: Comparative analysis of the test-kits and related documents for image quality assessment of cabinet x-ray screening equipment. This allows assessment items were selected and the methods for each assessment item were proposed. In addition, the configuration method of the assessment team was established by applying the technology readiness assessment(TRA). Results: Four of the assessment items were selected when estimate image quality by a comparative analysis of literature. For each assessment item, the evaluation method and minimum level of availability were determined. Finally, this paper proposes an imaging quality assessment of cabinet X-ray imaging security systems. Conclusion: Development of imaging security systems evaluation procedures for cabinet X-ray screening systems can be help improve performance certification of aviation security equipment.

해외파견 근로자의 문화적응 스트레스와 사회적 지지 및 정신건강과의 관계 : 아랍에미리트 병원 파견을 중심으로

윤연서(Yun Yeon Seo) 한국문화융합학회 2020 문화와 융합 Vol.42 No.7

본 연구는 해외파견자의 문화적응 스트레스와 사회적 지지 및 정신건강의 관계를 파악하기 위해 아랍에미리트에 근무하는 근로자 77명을 대상으로 시행하였다. 2016년 5월 1일부터 2016년 9월 30일까지 설문조사를 시행하였으며, 자료분석은 Mann-Whitney U test, Kruskal-Wallis H-test, Spearman rank-order 분석법을 이용하여 실시하였다. 대상자의 문화적응 스트레스는 총점 180점 만점에 평균 81점으로 나타나 보통보다 낮은 점수를 보였고, 대상자의 종교, 파견 전 교육경험, 파견 연장 의도에 따라 차이를 보였으며, 정신건강에 양적인 상관관계를 나타냈다. 사회적 지지는 파견 동기에 따라 차이가 있었으며, 가족을 동반하지 않은 경우, 미혼인 경우가 사회적 지지도가 더 높은 것으로 나타났다. 정신건강 정도는 총점 120점 만점에 평균 69점으로 중간 정도로 나타났으며, 문화적응 스트레스가 높을수록 정신건강은 좋지 않은 것으로 나타났다. 정신건강은 여성과 종교가 없는 경우, 파견 연장을 원하지 않는 경우 더 높게 나타났으며, 파견 동기에 따라 차이가 나타났다. 이러한 연구결과를 바탕으로 파견 전 파견국 문화에 관한 사전 교육을 시행하여 문화적응 스트레스를 줄이고 정신건강을 향상시킬 수 있는 파견자를 위한 효율적 중재개발 교육프로그램을 개발할 것을 제안한다. Purpose: This study examined the relationship between acculturation stress, social support, and mental health among expatriates in UAE hospitals. Methods: Data were collected from a convenience sample of 77 expatriates in UAE from May 1 to September 30, 2016. Structured questionnaires measured the degree of acculturation stress, social support, and mental health. Data analysis was conducted using the Mann-Whitney U test, Kruskal-Wallis H-test, and Spearman rank-order correlation coefficient. Results: Mental health was associated with acculturation stress except social support. Mental health was significantly related to four variables: expatriates’ gender, religion, motivation to expatriate, and intention to extend expatriation. However, acculturation stress was significantly related to three variables: expatriates’ gender, pre-education, and intention to extend expatriation. Conclusion: These findings highlight the importance of providing interventions for the acculturation stress and mental health of expatriates in the UAE. Pre-education for new expatriates is also essential to reduce their acculturation stress.