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논클로그 및 스크류식 원심펌프의 임펠러 형상이 펌프성능에 미치는 영향
김동주,서상호,성순경,Kim, Dong-Joo,Suh, Sang-Ho,Sung, Sun-Kyung 한국유체기계학회 1998 한국유체기계학회 논문집 Vol.1 No.1
In this study, the effects of the impeller shapes on the pump performances of the non-clogging and the screw-type centrifugal pumps are experimentally studied. The characteristics of total head, efficiency and power of the non-clogging pump increase as the number of vanes increases. The screw-type centrifugal pump with the linear-shape vane shows a little better performance than that of the screw-type centrifugal pump with the curved-shape vane. The differences in the characteristics of total head, efficiency and power are, however, insignificant. Therefore, it is advisable that, considering the convenience of pump manufacturing, the screw-type centrifugal pump with the linear-shape vane should be used. This study also compares the pump characteristics of the non-clogging pump and screw-type centrifugal pump. The characteristics of total head and efficiency of the non-clogging pump are better than those of the screw-type centrifugal pump. The screw-type centrifugal pump requires more shaft power than the non-clogging pump.
의도적 혈관 압박손상 후의 가토 대퇴동맥의 미세혈관 문합시 헤파린의 국소세척 및 전신투여 효과에 대한 실험적 연구
김동주,김수관,문성용,윤정훈,Kim, Dong-Joo,Kim, Su-Gwan,Moon, Seong-Yong,Yoon, Jung-Hoon 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.2
This study compared the histological patency rates of anastomoses of the femoral artery. Twelve rabbits weighing about 2 kg were studied. Both the right and left femoral arteries were cut. The control group had no damage to the vessel, saline irrigation, and micro-anastomosis. Experimental group I had a crush injury to the vessel, saline irrigation, and micro-anastomosis. Experimental group II had a crush injury, saline irrigation, 100 U/ml heparin irrigation, and micro-anastomosis. Experimental group III had the same treatment as experimental group II plus the systemic application of 100 U/kg heparin iv. The histological patency rates were compared. The patency rates of the control group 30 min and 3 days after the anastomosis were 100 and 83%, respectively. The respective rates for experimental groups I and II 30 min and 3 days after the anastomosis were 100% in all cases. The respective rates in experimental group III were 100 and 83%. In this study, no significant correlation was observed between the patency rate and the effects of local irrigation or the systemic application of heparin on the microvascular anastomosis of the rabbit femoral artery. However, the patency rate tended to decrease concomitantly with an increase in surgery time. Increased bleeding was observed after the systemic application of heparin. Obvious damage to the crush-injured vascular endothelium was detected on histologic examination of the micro-anastomosed area. In addition, some vessels subjected to crush injury contained thrombi attached to the vascular endothelium. No preventive effect of heparin on thrombus formation was observed.
김동주,전보영,권정윤,Dong Ju Kim,M,D,Bo Young Chun,M,D,Jung Yoon Kwon,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.2
Purpose: To evaluate the clinical characteristics of refractive accommodative esotropia followed up for 5 years. Methods: Forty-three subjects with refractive accommodative esotropia, who had been followed up for at least 5 years were included in this study. Age and sex distribution, age at onset and the interval between onset of esotropia and initial visit were evaluated. Changes of the angle of deviation and the amount of hyperopia during follow-up period were analyzed. Results: The initial amount of hyperopia of 4.42±3.27D was decreased to 3.84±3.46D by the last exam. The average rate of hyperopia decrease per year was 0.12 diopters. The average angles of deviation at the initial and final exam were 31.74±13.72PD and 30.11±14.27PD, respectively. Among the 43 subjects who participated in this study, decompensation occurred in 2 patients in the third year and 1 patient in the fourth year. Conclusions: There is a tendency for the amount of hyperopia to decrease over time. Further, deviation may deteriorate over time as well. Thus, long term follow-up management is necessary to control deviation in patients with refractive accommodative esotropia.