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안정형 및 불안정형 협심증 환자에서 관동맥 조영술상 병변형태와 관동맥내 혈전에 대한 비교
이록윤(Rok Yun Lee),한윤창(Yun Chang Han),지재환(Jae Hwan Jee),조병동(Byung Dong Cho),채경수(Gyeoung Soo Chae),장명국(Myoung Kuk Jang),서유미(Yu Mi Seo),김재삼(Jai Sam Kim),경태영(Tae Young Kyong),임종윤(Chong Yun Rim),고영박(Young B 대한내과학회 1996 대한내과학회지 Vol.51 No.6
Objectives: Unlike stable angina, unstable angina is a common syndrome associated with significant morbidity and frequent progression to acute myocardial infarction. Several investigators have suggested that corronary artery thrombus formation, most likely secondary to plaque rupture in complex morphology of stenotic coronary artery, may preci- pitate unstable angina. But the frequency of coronary artery thrombus by coronary angiography is diverse. Methods: In 108 patients with either stable(27 patients) or unstable angina(81 patients), the morphology of coronary artery lesions was qualitatively assessed by angiography. Each obstruction reducing the luminal diameter of the vessel by 50% or greater was categorized into one of Ambrose morphologic classification. Results: Type II eccentric lesion was more frequent in patients with unstable angina pectoris (38.9%) than in patients with stable angina pectoris (6.1%) (p<0.01). Frequency of intraluminal ulcer was 31.9% in unstable angina, and 8.6% in stable angina(p<0.05). Intraluminal thrombus was observed more frequently in unstable angina pectoris(18.6%) than in stable angina pectoris(6.1%)(p<0,05). Conclusions: The high prevalence of type II eccentric lesion morphology, ulcer, and intraluminal thrombus observed in patients with unstable angina emphasizes the important role of intimal disruption and of subsequent thrombogenesis in the pathogenesis of myocardial ischemic in those unstable syndromes of ischemic heart disease.
실시간 오디오-악보 정렬에 기반한 사용자 연주 음고 피드백 시스템
권세준(Sejun Kwon),한병준(Byeong-jun Han),한윤창(Yoon Chang Han),이교구(Kyogu Lee) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
최근 스마트폰과 태블릿 PC 등 언제 어디서나 다양한 작업을 수행할 수 있는 포터블 장치가 널리 보급되고 있다. 이러한 스마트 기기의 특성은 학습 시간과 공간의 제약을 극복하기 위한 유용한 속성으로 음악 학습자들의 주목을 받고 있다. 이에, 본 논문은 스마트 기기 상에서 음악 학습 시스템 실현을 위한 실시간 오디오-악보 정렬 기반 사용자 연주와 악보 간 상호작용 시스템을 제안한다. 제안하는 시스템은 스마트 기기 상 마이크를 통해 사용자의 연주 신호를 실시간으로 입력 받아 악보 상의 음표와 정렬한 후, 이를 기반으로 악보에서의 현재 연주 위치를 보이는 한편 사용자의 연주 오류를 검출하여 준다. 실험에서는 제안하는 시스템의 정렬 및 오류 검출의 성능을 평가하고 분석을 진행하였다. Recently, there are widely supplied portable devices, such as smartphone and table PC, which allow the user to do various kinds of tasks in anytime and anywhere. Smart device does not have limitations comes from location and time, thus, this characteristic can be useful for music educational purpose which needs to be repeated frequently. This paper proposes a musical performance feedback system based on real-time audio-score alignment. In the proposed system, a real-time audio input is acquired from on-board microphone and is aligned with musical score. Based on this information, the system notifies the user about currently performing part and detects where the user played wrong musical notes. In experiment, we estimate and analyze the alignment and error detection performance of the proposed system.
관동맥 연축환자의 약물투여기간 및 질병의 활성도에 대한 장기 추적 관찰
김철홍(Cheol Hong Kim),유규형(Kyu Hyung Ryu),한성우(Seong Woo Han),박규용(Kyu Yong Park),한윤창(Yun Chang Han),홍경순(Kyung Soon Hong),두영철(Young Cheoul Doo),한규록(Kyu Rok Han),오동진(Dong Jin Oh),임종윤(Chong Yun Rim),고영박(Youn 대한내과학회 1998 대한내과학회지 Vol.54 No.1
Objectives: Clinical course of vasospastic angina is variable : spontaneous remission, persistent angina and progression of disease or death. Several studies from western institutes have been performed on the clinical characteristics and long-term prognosis of patient with coronary vasospasm. In these reports, 53-82% of patients had spontaneous remission. These results may be assumed differ from that of Korean patients with vasospastic angina, but no detailed studies have been reported in Korea. Currently, in patients with vasospastic angina, treatment with calcium antagonists and/or nitrates are effective in reducing the frequency of anginal attacks. And, clinical course and outcome of vasospastic angina may be different from previous western reports thereafter. The purpose of this study is to describe the disease activities and the factors influencing the clinical course of vasospastic angina in relation to medication-period; age, sex, risk factors, extents of coronary vasospasm, initial ischemic events and significance of fixed lesion. Also we tried to determine if clinical or angiographic variables might be useful in predicting the possibility of spontaneous remission for an each patient. Methods: Eighty-seven patients with vasospastic angina(M/F;58/29, mean age;53±9 years) were included and all documented coronary vasospasm on the coronary angiogram, spontaneous spasm in 35, positive ergonovine or acetylchoine provocation in 52. Coronary artery spasm was defined as more than 75% reduction in coronary luminal diameter and ST segment changes on electrocardiogram, or typical anginal symptoms together and then narrowed coronary arteries were recovered after intracoronary nitroglycerin. The patients were treated with calcium antagonists(nifedipine, diltiazem, amlodipine and felodipine) and nitrates single or both and were divided into 3 groups according to angina activity: group I, which anginal attacks less than one time monthly, group II, which anginal symptoms occurred in 24- 48 hours after withdrawal of medication, group III, which symptoms recurred frequently with the incidence of over one time weekly, After discharge, each patient returned to a medical out-patient department at every 1-2 months. Results: Age, gender, other coronary risk factors, disease activity of vasospastic angina, initial clinical presentation at admission, coronary angiographic findings, fixed lesion and alcohol-induced anginal attacks were not statistically different among the 3 groups. But admission frequency of group II and III, which had a high anginal activities, were more than that of group I significantly. Conclusion: In the present study, it is concluded that medical treatment in patients with vasospastic angina in Korea may be taken long duration during follow-up period if the patient of group II and III considered to persistent angina group. To assess the prevalence of spontaneous remission, we consider that systematic attempts to taper medication may be done for patient of group I(angina free-on treatment) after absence of anginal attacks for at least one year medication-period.