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홍윤기 ( Yoon Ki Hong ),남기병 ( Gi Byoung Nam ),최기준 ( Kee Joon Choi ),박경민 ( Kyoung Min Park ),김정욱 ( Jong Wook Kim ),김형용 ( Hyung Yong Kim ),김유호 ( You Ho Kim ) 대한내과학회 2008 대한내과학회지 Vol.74 No.1
목적: 본 연구는 우리나라에서 제세동기를 삽입한 환자들의 임상적 특징을 알아보고자 하였다. 방법: 서울아산병원에서 1996년부터 2005년 까지 제세동기를 삽입한 135명의 환자들을 대상으로 후향적으로 분석하였다. 결과: 제세동기를 삽입하게 된 환자들의 3가지 주요 기저 질환은 심근 경색 후 심실성 빈맥, 브루가다 증후군, 비후성 심근증이었고, 이 중 브루가다 증후군이 상대적으로 많은 것은 서구와 다른 특징이다. 제세동기 삽입 후 적절한 전기 충격이 43명(31.9%)에서 발생하였으며, 부적절한 전기 충격도 39명(28.9%)에서 발생하였다. 결론: 제세동기는 급성 심장사의 고위험군 환자에서 치명적인 심실성 부정맥으로 인한 사망을 감소시키는데 중요한 역할을 할 것으로 생각된다. 하지만 상당수의 환자에서 부적절한 전기충격이나 제세동기의 감지오류 등의 문제가 발생하였고, 이는 적절한 항부정맥제의 사용이나 제세동기 감지 설정의 최적화 등을 통하여 최소화할 필요성이 있음을 시사한다. Background/Aims: The purpose of this study was to analyze the clinical features of the patients who underwent implantable cardioverter- defibrillator (ICD) treatment. Methods: The clinical features and the test data of the intracardiac electrograms for the patients who underwent ICD implantation between 1996 and 2005 at Asan Medical Center were retrospectively analyzed. Results: One hundred thirty five patients (109 males and 26 females, a mean age of 54±13 years) were included in this study. The underlying cardiovascular diseases were post-myocardial infarction (MI) ventricular tachycardia (VT), Brugada syndrome, hypertrophic cardiomyopathy (CM) and dilated CM. During a mean of 2.9±2.0 years of follow-up, appropriate shocks were delivered in 43 (31.9%) and inappropriate shocks were delivered in 39 (28.9%) patients. Anti-tachycardia pacing therapy was effective in 17 patients. Inappropriate shocks were caused by atrial fibrillation with rapid ventricular responses, T wave oversensing or electromagnetic interference. Major complications of ICD therapy during follow-up included ICD infection, lead problems, electromagnetic interference and generator malfunction. Conclusions: The three major cardiovascular diseases in patients with ICD implantation were post-MI VT, Brugada syndrome and hypertrophic CM. Inappropriate shocks were delivered to a significant proportion of the patients, which emphasize the need for an aggressive rate control strategy in patients with atrial fibrillation. Most complications of ICD therapy were caused by device malfunction. (Korean J Med 74:68-74, 2008)
Thallium - 201 심근 단층영상의 정량적 분석
이명철(Myung Chul Lee),정준기(June Key Chung),안규리(Cu Rie Ahn),이동수(Dong Soo Lee),김상은(Sang Eun Kim),최창운(Chang Woon Choi),고창순,이영우,서정돈,박영배,최윤식,이명묵(Myoung Mook Lee),남기병(Gi Byoung Nam),최기준(Kee Joon Choi),손대원(Dae 대한핵의학회 1991 핵의학 분자영상 Vol.25 No.2
N/A The purpose of this study was to assess the ability of quantitative Tl-201 tomography to identify and localize coronary artery disease (CAD). The study population consisted of 4l. patients (31 males, 10 females; mean age 55 +- 7 yr) including 14 with prior myocardial infarction who underwent both exercise Tl-201 myocardium SPECT and coronary angiography for the evaluation of chest pain. From the short axis and vertical long axis tomograms, stress extent polar maps were generated by Cedars-Sinai Medical Center prograrn, and the 9 stress defect extent (SDE) was quantified for each coronary artery territory. For the purpose of this study, the coronary circulation was divided into 6 arterial segments, and the myocardial ischemic score (MIS) was calculated from the coronary angiogram. Sensitivity for the detection of CAD (>50% coronary stenosis by angiography) by stress eXtent polar map was 95% in single vessel disease, and 100% in double and triple vessel deseases. Overall sensitivity was 97%<. Sensitivity and specificity for the detection of individual diseased vessels werc, respectively, 87% and 90% for the left anterior descending artery (LAD), 36% and 93% for the left circumflex artery (LCX), and 71% and 70%, for the right coronary artery (RCA). Concordance for the detection of individual diseased vessels between the coronary angiography and stress polar map was fair for the LAD (kappa=0.70), and RCA (kappa=0.41) lesions, whereas it was poor for the LCK lesions (kappa =0.32) There were siginificant correlations between the MIS and SDE in LAD (rs=0. 56, p=0.0027), and RCA territory (rs=0.60, p=0.0094). No significant correlation was found in LCX territory. When total vascular territories were combined, there was a significant correlation between the MIS and SDE (rs=0.42, p=0,0116). In conclusion, the quantitative analysis of TI-201 tomograms appears to be accurate for determining the presence and location of CAD.
알고리즘 개선을 통한 엘리베이터 사용성 비교 시뮬레이션
황성연(Seong-Yeon Hwang),박상희(Sang-Hee Park),송종원,태현철(Hyun-Chul Tae),고영명(Yeong-Myeong Ko),백승민(Seung-Min Baek),최기준(Gi-Joon Choi),이기호(Gi-Ho Lee) 대한산업공학회 2018 대한산업공학회 추계학술대회논문집 Vol.2018 No.11
엘리베이터 Destination Dispatching System(DDS; 목적지 전송 시스템) 이란 건물에서 실시간으로 발생하는 엘리베이터 탑승객들을 원하는 목적 층으로 갈 수 있도록 엘리베이터의 배차를 관리/운영하는 시스템을 의미한다. 효율적인 엘리베이터 운용을 위해서는 소요 시간이 짧아야 하고, 이를 위해서는 최적의 알고리즘을 선정하는 일이 중요하다. 하지만 국내 중소기업 엘리베이터 기업의 DSS 기술은 아직 기초 수준에 머물고 있다. 본 연구는 여러 DDS 알고리즘을 제안하고 본 연구에서 구현한 엘리베이터 시뮬레이터를 통해 다양한 알고리즘의 비교 실험 결과를 제공한다.