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순도를 달리한 알루미나 세라믹스의 분위기 압력변화에 따른 Tribology 특성
진동규,박흥식,서영백,옥철호,Jin, Dong-Gyu,Park, Heung-Sik,Seo, Yeong-Baek,Ok, Cheol-Ho 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
This study was undertaken to investigate tribological characteristics with atmospheric pressure for three alumina ceramics of different purity, such as, 85 %, 95 % and 99.7 %. The wear test was carried out using the wear test device which was designed for this study in air, $10^-2$ Torr and $10^-4$ Torr. The friction coefficient depends entirely on atmospheric pressure and alumina with lower purity than higher purity has been much affected by heat accumulation. The friction surface of ceramics have been protected in the air by the influence of the oxides transferred from STB2. However, the protective layer can not be formed due to the decrease of oxygen in vacuum.
지속성 외래 복막투석으로 성공적으로 조절되고 있는 메칠말로닌산혈증 1례
백경훈,진동규,Baek, Gyeong-Hun,Jin, Dong-Gyu 대한유전성대사질환학회 2003 대한유전성대사질환학회지 Vol.3 No.1
저자들은 예후가 좋지 않은 것으로 알려진 $mut^0$ type 메칠말로닌산혈증 환아를 지속적 외래 복막투석을 통해 신경학적 결손 없이 7세까지 정상 성장 발달을 이루도록 한 증례를 경험하였기에 보고하는 바이다.
심근허혈의 지표로서 운동부하 심전도에서 PR 절 경사의 의의
박창규(Chang Gyu Park),김영훈(Young Hoon Kim),서홍식(Hong Seog Seo),임도선(Do Sun Im),김혜경(Hea Kyung Kim),진동규(Dong Gyu Jin),심완주(Wan Joo Shim),오동주(Dong Joo Oh),박정의(Jeong Euy Park),노영무(Young Moo Ro) 대한내과학회 1993 대한내과학회지 Vol.45 No.4
N/A Objectives: It was postulated that exaggerated atrial repolarization waves seen during exercise may extend from the PR segment into the ST segment and T wave, and thus can produce ST segment depressions mimicking myocardial ischemia. The aim of this study is to investigate whether or not there is any association between P-R segment slope and ST segment depression in exercise ECG for predicting accuracy of myocardial ischemia. Method: The treadmill exercise test was performed using the modified Bruce Protocol (Korea University Hospital Protocol) in 62 patients with chest pain. The P wave amplitude, PR segment slope and duration, the ST segment duration, and the J point depression were studied in Lead II and V5 in 39 patients whose exercise ECG suggested myocardial ischemia. The PR segment slope was determined by measuring the velocity of descent in mm/sec. Coronary arteriography was performed in all patients, and≥50% stenosis in a major cornary artery was considered a significant lesion. Results: The overall sensitivity and specificity of the exercise test in 62 patients was 74% and 43%, respectively. The exercise test results in 10 patients were deemed false positive because of normal coronary arteriograms and left ventricular function. The false positive group was characterized by more marked downsloping PR segments in Lead II at peak exercise (15.9±9.3 mm/ sec vs 4.8±5.6mm/sec, p<0.05) and more rapid peak exercise heart rates than those of the true positive group (151±26 vs 131±25, p<0.05). The sensitivity and specificity of exercise-induced ST depression for CAD were changed as following if positive exercise test with increased PR segment slope is considered as false positive test: 1) with PR segment is slope over 5mm/s: snsitivity 78%, specificity 39% 2) with PR segment slope over 10 mm/s: sensitivity 83%, specificity 45% 3) with PR segment slope over 15 mm/s: sensitivity 79%, specificity 46%. Conclusion: These findings suggest that markedly downsloping PR segment seen in otherwise positive exercise test by ST segment depression criteria is a sign predicting false positive exercise test.