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Gamma-PF 보드를 이용한 아날로그 감마카메라의 디지털화 연구
김희중,소수길,봉정균,김한명,김장휘,주관식,이종두,Kim, Hui-Jung,So, Su-Gil,Bong, Jeong-Gyun,Kim, Han-Myeong,Kim, Jang-Hwi,Ju, Gwan-Sik,Lee, Jong-Du 대한의용생체공학회 1998 의공학회지 Vol.19 No.4
아날로그 감마카메라에 비해 디지털 카메라는 Q.C가 편리하고, Calibration과 조작이 매우 쉬운 장점들을 갖고 있어 영상 질을 향상시킬 뿐만 아니라 진단의 정확도를 높일 수 있다. 더욱이, 디지털 카메라로 획득한 디지털 영상은 PACS(Picture Archiving and Communication System) 뿐만 아니라 원격진료에도 활용될 수 있다. 그러나, 많은 병원들이 아직도 아날로그 카메라를 사용하고 있고 이들을 디지털 카메라로 대체하기는 어려운 상황에 있다. 본 연구는 아날로그 감마카메라를 디지털화 할 수 있는지의 가능성을 보는 것이었다. 카메라를 디지털화 한 후 균일도 계수능력 등의 물리적 특성을 측정하였다. 임상에서의 사용 가능성을 보기 위해 아날로그 시스템과 디지털 시스템을 동시에 연결하여 임상 데이터들을 획득하였다. 이들의 결과는 임상환경에서 아날로그 카메라를 디지털화 하 수 있다는 가능성을 보여주었다. Digital gamma camera has many advantages over analog gamma camera. These include convenient quality control, easy calibration and operation, and possible image quantitation which results in improving diagnostic accuracies. The digital data can also be utilized for telemedicine and picture archiving and communication system. However, many hospitals still operate analog cameras and have difficult situation to replace them with digital cameras. We have studied a feasibility of digitalizing an analog gamma camera into a digital camera using Gamma-PF interface board. The physical characteristics that we have measured are spatial resolution, sensitivity, uniformity, and image contrast. The patient's data obtained for both analog and digital camera showed very similar image quality. The results suggest that it may be feasible to upgrade an analog camera into a digital gamma camera in clinical environments.
미세각막절개 백내장 수술과 고전적 백내장 수술에서의 각막내피세포의 손상정도 비교
김희중,김진형,이도형,Hee Jung Kim,Jin Hyoung Kim,Do Hyung Lee 대한안과학회 2007 대한안과학회지 Vol.48 No.1
Purpose: To evaluate the damage to corneal endothelial cells following coaxial phacoemulsification and bimanual microincision cataract surgery (MICS). Methods: We measured and compared the changes in the corneal endothelial mean cell density, cell size variation coefficient, hexagonality, and central corneal thickness in senile cataract patients who had received either coaxial phacoemulsification (Group 1, n=20), MICS using ultrasound (Group 2, n=20), and MICS using laser (Group 3, n=20). The endothelial cell parameters and corneal thickness were evaluated preoperatively and at 1 week, 1 month, and 2 months postoperatively. Results: There was no significant difference among the three groups in terms of the endothelial cell parameters and corneal thickness during two months (p>0.05). Conclusions: MICS is a safe technique that does not appear to be associated with more damage to the corneal endothelium than coaxial phacoemulsification. A longer follow-up study is necessary to investigate its potential benefits for replacing conventional surgery.
CO<sub>2</sub> laser조사가 성견치수에 미치는 영향에 관한 실험적 연구
김희중,이찬영,이승종,이정석,Kim, Hee-Joong,Lee, Chan-Young,Lee, Sung-Jong,Lee, Chung-Suck 대한치과보존학회 1988 Restorative Dentistry & Endodontics Vol.13 No.1
The object of this paper was to investigate the histopatological changes on dog's pulp under cavitation by irradiation of the $CO_2$ laser. The subjects were derived from four dogs, and irradiated 113.23 J/$mm^2$, 283.09 J/$mm^2$, 566.08 J/$mm^2$ in Group I, II, and III respectively. The dogs were sacrificed immediately, 24 hour, 72 hour and 1 week after $CO_2$ laser treatment. For light microscopic examination, routine H-E and PAS stains were employed. For electron microscopic observation, the teeth were fixed in 1% paraformaldehyde and 1% glutaraldehyde, decalcified teeth in 10% EDTA were stained by uranyl acetate and lead citrate. The observation was made with a Hitachi H-500 model electron microscope. The following results were obtained in this study: 1. At the early stage of the experimental sub-groups-immediately, 24 hour, 72 hour samples of Group I, II and III-coagulation necrosis and hyperemia were observed in odontoblastic and subodontoblastic pulpal layer. 2. At the 1 week sub-group of Group I, II, regenerative hyperplasia of the odontoblasts without coagulation necrosis were revealed, in addition to thickened predentin. On he other hand coagulation necrosis and atrophic change accompanying with hyperplasia were found at the 1 week sub-group of Group III. 3. Ultrastructurally, the odontoblasts appeared nuclear degeneration, vacuolar change of cytoplasmic organelles and rupture of plasma membrane at the early stage of the experimental period of all groups. 4. Under spectrohelioscopic examination, regenerative odontobalsts were seen at the 1 week specimens of Group I, II and III. 5. The pulpal response occured at 113-566 J/$mm^2$. The pathologic change of pulp tissue occured at the early experimental period but regeneration of odontoblasts could be seen after 1 week.
연축전지 양극기판의 기계적 특성비교 분석 및 비 파괴 평가기법의 적용
김희중,이민래,이준현,Kim, Hui-Jung,Lee, Min-Rae,Lee, Jun-Hyeon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
It is well recognized that improving capacity of positive grid in battery is one of key factors for controlling the expected long lift-time of Battery Energy Storage System(B.E.S.S). Thus it is really important to characterized material properties of positive grid which are mainly affected by fabrication process. In this study, two kinds of positive grids, which were fabricated by gravity casting and die-casting technique were used. Micro-structural observation and tensile test were conducted to investigate the effect of fabrication process of positive grid. Ultrasonic measurement based on pulse-echo method and ultrasonic C-scan technique also performed to correlate ultrasonic velocity with porosity ratio in positive grid. It was found that the porosity ratio of grid fabricated by gravity casting technique increased significantly compared to the grid fabricated by die-casting technique. It was also shown that ulrasonic technique is effective to evaluate the porosity ratio in positive grid.