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- 저자 : Choi Gum Ha (검색결과 8 건)
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金正金,盧英夏,崔鍾烈 최신의학사 1968 最新醫學 Vol.11 No.10
Diffusion properly of the cornea to CO2 has studied in present report. Fresh cornea was excised from dog or rabbit and was tightly ligated to, the open end of a small glass capsule. The space of bigger glass box in which glass; capsule with cornea sample is contained was filled with pure CO2 under positive pressure of 3 mmHg. The other end' of glass capsule was connected to two 10 nil syringes by two narrow polyethylen tubes and the total gas space of the capsule, tubes and syringes was arranged as to be 9 ml filled with room air., The volume of diffused COZ into 'the capsule from outer space was measured by analysis of the CO2 composition in the-capsule space. The diffusion rate of CO2 was measured at each 5th minute for 30 minutes of experiment. Results obtained are summarized as follow:. " 1. In 9'samples of dog cornea, CO2 diffusion rate was 5.4 XW-3 ml/min/cmz in average of 30 minutes duration and in first '5 minutes, -the diffusion rate was 7.87 X10-3 ml/min/emz. In 4 samples of rabbit cornea, ~COZ diffusion rate was 7.54 X10^(-3 )ml/min/cmz in average of 30 minutes duration and was 10.5 X 10-3 ml/min/=2 in first 5 minutes.. 7 2., Diffusion coefficient of CO2 in dog cornea in first 5 minutes is calculated as 10.55 X10-4 cm2/min and permeation . coefficient of CO2 in dog cornea is calculated as 5.89 X 10-4 cui2/min/atm. Diffusion coefficient' and permeation coefficient of 02 in.dog cornea. is driven from those of' .0O2. in dog cornea and is estimated as 10.88 X 10-4 cm.2/min and 2.56 X 10^(-3)cm2/min/atm. respectively
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재폐로 동작에 따른 변압기형 SFCL과 저항형 SFCL의 특성 비교
최수근(Soo-Geun Choi),최효상(Hyo-Sang Choi),조용선(Yong-Sun Cho),박형민(Hyung-Min Park),정병익(Byung-Ik Jung),하경훈(Kyoung-Hun Ha),오금곤(Gum-Kon Oh),김덕구(Duk-Goo Kim),고성필(Sung-Pil Go) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
In this paper, we analyze the fault current limit and recovery characteristic of Resistive-type SFCL and Transformer-type according to reclosing operation. As the experimental conditions, we varied the tum's ratio between primary and secondary coils in transformer-type SFCL and twice opening times in the reclosing of circuit breaker were set as the 0.5 and 15 seconds, respectively. Under the equally applied voltage, we confirmed that the fault current limited by the SFCL was decreased by Transformer-type SFCL. Meanwhile, the recovery time of superconducting units in the transformer-type SFCL was shorter. By these results, we thought the recovery time of SFCL according to the reclosing operation confirm Transformer-type SFCL time rather than Resistive-type SFCL.
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답전윤환에 따른 토착 Bradyrhizobium japonicum의 서식밀도와 토양 이화학성과의 관계
강위금,박창영,윤문태,최상욱,하호성 ( Ui Gum Kang,Chang Young Park,Moon Tae Youn,Sang Uk Choi,Ho Sung Ha ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.5
The relatedness of naturalized Bradyrhizobium japonicum populations with soil physicochemical characteristics as affected by paddy rice-upland soybean rotation cropping with conventional and none fertilization in Chilgog clay loam soils were determined as follows. The populations of B. japonicum in soils were increased from about 10¹ in continuous paddy upto 10³cells/g.soil only in one-year rotation of upland use with soybean cropping. Compared to the densities in plots of conventional fertilization, those in none fertilization were high ranging from 1.9 to 10 fold in 2-year upland use rotation and both in 3-year upland use rotation and 4-year upland use, respectively. The populations were positively correlated with soil organic matter contents(r=0.83^*), Ca/K(r=0.74^*), and(Ca+Mg)/K(r=0.72^*) and were negatively correlated with soil hardness(r=-0.73^*). And the soil populations increased by paddy-upland rotation resulted in superior symbiotic potentials to those in continuous paddy use in terms of nodule mass, nitrogenase activity, and soybean shoot dry weight.
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식도 정맥류 출혈에 대한 내시경적 경화요법의 장기관찰 결과
정정명,박정현,구대식,김규환,이상혁,최하진 인제대학교 1992 仁濟醫學 Vol.13 No.4
In 1939, Crafoord and Frenckner originally reported the sucessful use of endoscopic sclerotherapy by paravasal injection of quinine as a sclerosant to control acute variceal bleeding of a 16-year-old girl. After the introduction of shunt operation as a treatment of acute variceal bleeding, the endoscopic sclerotherapy became less adoptable for a while. But since 1970, with the development of the technique, equipments and newer sclerosants, endoscopic sclerotherapy became favorable as a treatment of acute variceal bleeding. Since 1980 in Korea, endoscopic sclerotherapy as a treatment of acute variceal bleeding has been practiced in many clinics. However, there are few reports of the prognosis and survival rates of the patients who received endoscopic sclerotherapy, and there are many differences among those reports. Now we report the results of the clinical observation and the survival rates of 125 patients who have been followed for several years(from June 1985 to June 1991) by the Department of Internal Medicine, Paik Hospital, Inje University, Pusan. The results are as follows. 1.125 patients(103 male and 22 female) with bleeding esophageal varices were treated by endoscopic sclerotherapy and followed over a period ranging 3∼6 years. Among them, 24 patients were Child class A, 43 Child class B and 58 Child class C. In the degrees of varices, 65 patients showed grade III and 56 patients grade IV respectively, accounting for 97% of all patients. 2.The most prevalent underlying disease was post-necrotic liver cirrhosis in 84 patients, alcoholic liver cirrhosis in 12 patients, chronic active hepatitls in 4, idiopathic portal hypertension in 4 and unknown in 10 patients. 3.Variceal rebleeding after sclerotherapy occorred in 51 patients(40.8%) ; rebleeding occurred within 6 months in 20 patients(16.0%), and after 6 months in 31 patients(24.8%). 4.Complications after slcerotherapy occurred in 16 patients(12.8%) ; pneumonia 6 patients, esophageal ulcer 4, esophageal stricture 3, and mediastinitis 3 patients. 5.Fifty-four patients(43.2%) were dead during the clinical observation period : 24 patients(19.2%) were died within 1 month after sclerotherapy, and 30 patients(24.0%) after 1 month. The most prevalent cause of death was hepatic failure accounting for half of all deaths. 6.The survival rate of the patients who were treated with sclerotherapy was calculated by Kaplan-Meier method. One year survival rate was 75%, 5 year survival rate was 40%. Patients in he Child grade A and B showed much higher survival rate than the patients in the Child grade C. With our experience, one third of the patients died within 2 years after sclerotherapy and another one third died 2-5 years after sclerotherapy, but the rest one third survived mostly over 5 years after sclerotherapy. In conclusion, endoscopic sclerotherapy of the aucte variceal bleeding shows still higher frequency of variceal rebleeding and does not affect the overall mortality rate, but endoscopic sclerotherapy is estimated to be an excellent method of choice in treatment of acute variceal bleeding with its excellent hemostatic effect and less side effects.
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Ko, Won Jin,Na, Young Cheon,Suh, Bum Sin,Kim, Hyeon A,Heo, Woo Hoe,Choi, Gum Ha,Lee, Seo Ul Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.6
Background We conducted an experimental study to compare the effect of massage using topical agents (Kelo-cote or Contractubex) on scar formation by massaging the healed burn wound on the dorsal area of Sprague-Dawley (SD) rats. Methods Four areas of second degree contact burn were made on the dorsal area of each of 15 SD rats, using a soldering iron 15 mm in diameter. After gross epithelialization in the defect, 15 SD rats were randomly divided into four groups: the Kelo-cote group, Contractubex group, Vaseline group, and control group. Rats in three of the groups (all but the Control group) were massaged twice per day for 5 minutes each day, while those in the Control group were left unattended. For histologic analysis, we performed a biopsy and evaluated the thickness of scar tissue. Results In the Kelo-cote and Contractubex groups, scar tissue thicknesses showed a significant decrease, compared with the Vaseline and control groups. However, no significant differences were observed between the Kelo-cote and Contractubex groups. In the Vaseline group, scar tissue thicknesses showed a significant decrease, compared with the control groups. Conclusions The findings of this study suggest that massage using a topical agent is helpful in the prevention of scar formation and that massage only with lubricant (no use of a topical agent) also has a considerable effect, although not as much as the use of a topical agent. Thus, we recommend massage with a topical agent on the post-burn scar as an effective method for decreasing the scar thickness.
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