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AMFC system에서의 비정질 실리콘 박막의 결정화 특성
강구현(Ku Hyun Kang),이승재(Seung Jae Lee),김선호(Sun He Kim),이수경(Sue Kyeong Lee),남승의(Seung Eui Nam),김형준(Hyoung June Kim) 한국진공학회(ASCT) 2005 Applied Science and Convergence Technology Vol.14 No.1
a-Si을 poly-Si으로 결정화하는 전형적인 방법으로는 고상결정화(solid Phase Crystallization, SPC)가 있다[1-3]. 고상결정화는 균일한 공정특성과 생산비가 저렴하다는 장점이 있으나, 고상결정화 공정에서 높은 공정온도와 긴 공정 시간은 유리 기판의 손상으로 인해 적용되기 어렵다. 본 논문에서는 고상결정화의 저온공정과 짧은 공정시간을 위해 교번자장결정화(Alternating Magnetic field Crystallization, AMFC) 시스템 내에서 결정화하는 동안 교변 자장(Alternating Magnetic Field)을 적용하는 새로운 방법을 소개한다. 고상결정화의 경우, 열처리 시간은 570℃에서 24시간이 소요되었으나, 교번자장결정화의 경우, 같은 온도에서 20분이 소요되었다. A typical method for obtaining poly-Si films is the solid phase crystallization(SPC) of amorphous Si. Advantages of SPC are uniformity, process quality and low cost of production. However, high process temperature and long process time prevent the employment of SPC process on thermally susceptible glass substrate. In this paper, we propose a new method that applies an alternating magnetic field during crystallization annealing in an alternating magnetic field crystallization(AMFC) system for lowering process temperature and shorter process time of SPC. When we crystallized, in the case of SPC, annealing time is 24 hours at 570℃. But in the case of AMFC, annealing time is only 20 minutes at the same temperature.
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이웅렬 ( Ung Youl Lee ),강구현 ( Ku Hyun Kang ),방명성 ( Myung Seong Bang ),남승의 ( Seung Eul Nam ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.4
N/A Conventional spheroidization process of cold heading quality steels requires long heat treatment time, and reduction of the heat treatment time is important for improving productivity in the industry. Recently, hot deformation method has been proposed as a means of increasing spherodization kinetics. In this study, the influences of hot deformation on the spherodization behavior of cold heading quality steels were investigated. Hot deformation at the temperature range of 700℃ significantly enhances the spheroidization kinetics. Hot deformation can lead to a substantial reduction of spherodization process time as low as 1-5 hrs.
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이중혈류유발 심폐소생술이 심정지를 유발한 개의 단기 생존율에 미치는 영향
황성오,조준휘,강구현,김성환,문중범,이강현,이승환,윤정한,최경훈,홍은석 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3
Background and Objectives: We previously reported that, compared with standard cardiopulmonary resuscitation(S-CPR), better hemodynamic effects could be achieved by simultaneous sterno-thoracic cardiopulmonary resuscitation(SST-CPR) in which we compressed the sternum and constricted the thorax circumferentially during the systolic period by using a device. This study was designed to assess whether SST-CPR, compared with S-CPR, improve the survival rate of dogs with cardiac arrest. Subjects and methods: Twenty-five mongrel dogs(19∼31㎏) were enrolled in this study. After four minutes of ventricular fibrillation induced by an AC current, animals were randomized to resuscitate with either S-CPR(n=13) or SST-CPR(n=12). Epinephrine(1 ㎎) was injected into the right atrium every three minutes after the beginning of CPR. Defibrillation was attempted after 6 minutes of CPR. Standard advanced cardiac life support was started if defibrillation was not successful. Results: SST-CPR resulted in significantly(p<0.001) higher systolic arterial pressure(91±47 vs 47±24 ㎜ Hg), diastolic pressure(43±24 vs 17±10 ㎜ Hg), coronary perfusion pressure(35±25 vs 13±9㎜ Hg), and end tidal CO2 tension(9±4 vs 3±2 ㎜ Hg). Two of 13 animals(15 %) resuscitated with S-CPR and six of 12 animals(50%) resuscitated with SST-CPR survived until 12 hours after cardiac arrest(p<0.05). Donclusion: SST-CPR, compared with S-CPR, improves the short-term survival rate in canine cardiac arrest.
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심폐소생술 중 심장펌프 이론의 증거로서 대동맥 크기의 변화
황성오,김선만,조준휘,오범진,김성환,강구현,이강현,이승환,윤정한,최경훈 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.1
Background : Although the cardiac pump mechanism and the thoracic pump mechanism have been suggested, the mechanism of blood flow generated by precordial compression in human remains controversial. We hypothesized that, during compression systole, the proximal descending thoracic aorta would be distended by forward blood flow if the heart acts as a pump, and be contracted or unchanged if increased intrathoracic pressure generates blood flow. Methods : Fourteen patients with cardiac arrest underwent transesophageal echocardiography to verify the morphologic changes of the descending thoracic aorta during standard manual cardiopulmonary resuscitation. The aortic dimensions including cross sectional area and diameters at the end of compression and of relaxation were measured proximal to and at the maximal compressing site of the descending thoracic aorta. Results : At the point of maximal compression, deformations of the descending thoracic aorta were observed during compression in all patients and ratio of the longest to shortest diameter of the aorta decreased during compression than relaxation(0.58±0.11, p=0.001). Gross sectional area of the aorta at the maximal compression decreased during compression than relaxation(3.01±1.91 versus 7.26±14.70㎠, p=0.035). Ratio of th longest to shortest diameter of the proximal descending thoracic aorta remained unchanged during compression and relaxation(1.0±0.88 versus 1.0±0.9, p=0.345). Cross sectional area of the proximal descending thoracic aorta increased during compression than relaxation(4.81±2.86 versus 4.29±2.51㎠, p=0.011). Conclusion : Distention of the proximal descending thoracic aorta and deformation of the aorta at the maximal compression during the compression systole suggests that the heart act as a pump during standard manual cardiopulmonary resuscitation in human.
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