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( Donghan Kim ),( Jeong Gwan Cho ),( Ki Hong Lee ),( Min Goo Lee ),( Keun Ho Park ),( Doo Sun Sim ),( Nam Sik Yoon ),( Hyun Ju Yoon ),( Kye Hun Kim ),( Young Joon Hong ),( Ju Han Kim ),( Youngkeun Ahn 대한내과학회 2011 대한내과학회 추계학술발표논문집 Vol.2011 No.1
Background and study objective: The anterior ischemic pattern such as negative T wave is most frequent Electrocardiographic (ECG) sign of pulmonary thromboembolism (PTE) or anterior wall acute myocardial infarction (AMI). The aim of the present study was to evaluate the distinguishable findings between AMI and PTE in patients with negative T wave in anterior lead. Subject and methods: We analyzed 12-lead ECG, echocardiography and laboratory finding of 151 patients (PTE group; n=51, AMI group; n=100) with the diagnosis of PTE and AMI confirmed by computed tomography or coronary angiography, at Chonnam National University Hospital, between July 2008 and July 2011. The ECG analysis included S1Q3T3 complex(negative S waves in lead I and negative Q or T waves in lead III), sinus tachycardia(>100 beats/min), right bundle branch block (RBBB), low QRS voltage in peripheral leads and pulmonary P wave in lead II. Echocardiographic findings was included both ventricular systolic function and right ventricular systolic pressure (RVSP). We compared the ECG, echocardiography and biomarkers to distinguish from PTE and AMI. Results: S1Q3T3 was the most frequent ECG finding (42%), and was more common in PTE than AMI (42% vs. 8.1%, p<0.001). Also sinus tachycardia (36% vs. 6.1%, p<0.001), low QRS in peripheral leads (24% vs. 8.1%, p=0.011), pulmonary P wave in lead II (10% vs. 1%, p=0.016) was more common in AMI than PTE. In echocardiography, RVSP (56 mmHg vs. 29.85 mmHg, p<0.001) and systolic function (65.64% vs. 56.41%, p<0.001) were significantly higher in PTE than AMI. In laboratory findings, D-dimer (0.7851 vs. 0.2112, p<0.001) was significantly higher and Troponin-I was significantly lower (0.4814 vs. 5.7928, p<0.001) in PTE than AMI. Conclusion: The S1Q3T3 in ECG, elevated RVSP in echocardiography, and D-dimer in laboratory findings were useful to distinguish AMI from PTE in patients with negative T wave in anterior lead.
Lee, Donghan,Lee, Weontae Korean Magnetic Resonance Society 1998 Journal of the Korean Magnetic Resonance Society Vol.2 No.1
The cross peak intensities versus mixing times of 2D NOESY spectrum for a corepressor L-trp were simulated for the case of a ligand exchanging between free (AX) and bound (A'X') forms in protein/DNA complex. The direct NOE (I(AX)) of the free ligand exhibited a small positive intensity indicative of the strong dominant influence of the bound ligand. The exchange-mediated NOE peak (I(AX')) was very sensitive to corepressor exchange. However, both diagonal (I(A'A')) and direct NOE (I(A'X')) intensities of the bound ligand were not affected much at initial stage. Both peaks were severely influenced by exchange at mixing times of greater than 100 ms. In conclusion, since the NOE intensity is a function of exchange rate, the exchange effect should be considered to properly extract accurate distance information for bound ligand in the presence of conformational exchange.
유튜브와 인공지능 챗봇을 활용한 과업 중심 초등영어 수업 모형 개발
이동한(Lee, Donghan) 영상영어교육학회 2021 영상영어교육 (STEM journal) Vol.22 No.1
This study aims to develop an English class instruction model for elementary schools in Korea through YouTube and AI chatbot. For this purpose, this study first investigated current task-based instruction models and reformulated a task performance model for elementary English classes. The current task performance model consists of three levels: pre-task, while-task, and post-task. Activities of each level are introduced through the roles of the teacher and student. Based on this current task performance model, a new task performance model was developed through the application of YouTube and AI Chatbot. The task performance model applied by YouTube and AI chatbot provides various activities for each task level. Activities through YouTube and chatbot were analyzed according to the three levels of performance: pre-task, while-task, and post-task. Finally, this study provided an English class instruction model for elementary schools through the application of the contents of a 6th grade English text book. The proposed English class instruction model for elementary schools is composed of three levels according to the procedures of class development plans: introduction, class activities, and wrap-up. Class activity models for each level based on movie clips and interactive contents with AI chatbot were provided including the contents of activities and teaching and learning materials.
PCS 시스템의 정지 차량 감지 성능 비교에 대한 연구
이동한(Donghan Lee),성기석(kiseok Seong),김중기(Joongki Kim),조철호(Chelho Cho) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Pre-Crash Safety(PCS) system has become a major part in an active safety system for avoiding forward collision. Most of commercial systems are radar based which detect only moving or moved-and-stopped vehicle and only assist driver’s braking force. Recently some of radar based Forward Collision Warning(FCW) system can detect the stationary target and indicate the warning signals. Also, a low-cost image sensor is additionally used to react to stationary vehicle and provide autonomous braking function for avoiding collision situation in sensor fusion. This paper presents the finding of the limitation values on the scenario that target vehicle is changed from a moving vehicle to stationary one and the comparison of detection performance on stationary target on PCS system.
FMVSS208 운전석 LRD성능에 영향을 주는 인자들에 대한 연구
이동한(Donghan Lee),이승훈(Seunghoon Lee),조영남(Youngnam Cho),서주형(Joohyung Seo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
FMVSS 208 (Federal Motor-Vehicle Safety Standard 208) rule was updated to reduce the injury of infant or female who are small in the condition of oop(out of position) when vehicle crash. In this paper we researched the factors which have influences on the driver's LRD(low risk deployment) performance in FMVSS 208 and suggested the optimization method of performance.