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- 저자 : Eun San Sohn (검색결과 6 건)
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손행종(Haeng Jong Sohn),전원호(Won Ho Jeon),윤윤보(Yoon Bo Yoon),최은수(Eun Soo Choi),김학산(Hak San Kim) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.3
The frequency and severity of intestinal tuberculosis have been significantly decreased due to the development of anti-tuberculosis chemotherapy, the preventive medicine, the vaccination and early detection of pulmonary tuberculosis. Among the gastrointestinal tract, the duode- num is one of site rarely involved by tuberculosis. It is very difficult to rnake a correct diagno- sis of duodenal tuberculosis, and even more difficult for its early diagnosis due to its non-spe- cific syrnptoms. Recently, the authors have experienced a case of duodenal tuberculosis pre- senting duodenal ulcer bleeding and obstructive jaundice due to tuberculous lymphadenitis. The patient was operated on for bleeding from a duodenal ulcer and the diagnosis was estab- lished at laparotomy by the presence of tuberculous (caseating) granulomas with epitheloid cells and multinucleated giant cells (horse shoe shape) of the duodenum and pancreaticoduo- lenal lymph nodes. And then, the patient improved following the administration of anti-tuber- culous chemotherapy. So, we report this case with a review of literature. (Korean J Gastroen- terol 1994; 26: 573 578)
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김광일,최은수,조은경,김학산,서정일,손진희,손행종,전원호,윤윤보 대한소화기학회 1995 대한소화기학회지 Vol.27 No.1
Background/Aims: Stomach cancer is the most common malignancy and one of the leading cause of death in Korea. However, the prognosis of early gastric carcinoma(EGC) has been reported execellent and this is why we emphasize the early diagnosis and treatment of gastric cancer. Methods: We analyzed 109 patients of early gastric carcinoma which had been confirmed by surgery and pathological examination from January 1986 to December 1992 in the National Medical Center. Resluts: The incidence of early gastric carcinoma was 18.5% of gastric resection for stomach cancer. Male to female ratio was 2.0:1 with male predominance. The commonly involved age of patients was 50 to 59 years and mean age was 55.2. The epigastric pain was predominant symptom and followed by epigastric discomfort and indigestion. The macroscopic classification revealed that the most common types were Ilc(31.9%) and its combined types(41.4%). In sixty cases(51.7%), the lesions extended to the submucosa, while fifty five cases(48.3%) were confined to the mucosa. The incidence of metastases to regional lymph nodes in mucosal carcinoma was in 8.9% and that of submucosal lesions was 28.3%(p$lt;0.05). The most commonly involved sites were antrum(60.3%) and lesser curvature(35.3%) of the stomach. Forty six cases(39.7%) were between 2.1 cm and 4.0cm in diameter and 15 cases less than 1cm. The most common pathologic type was tubular adenocarcinoma(82.8%), followed by signet ring ce11 carcinoma and mucinous adenocarcinoma. Overall 5 year survival rate for the entire group was 9l.6%. Conclusion: The clinical and pathologic features of early gastric carinoma in the National medical Center werc not much different from those of previous reports, except that the incidence was 18.5% in our series and higher than those of previous reports.
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固體間 不均-反應의 速度論 硏究. 高嶺土의 뮬라이트化反應
이희철,손은산,이익춘,Hee Cheol Lee,Eun San Sohn,Ikchoon Lee 대한화학회 1982 대한화학회지 Vol.26 No.5
精製한 高嶺土와 ${\alpha}$-$Al_2O_3$을 枕降法에 의해 10${\mu}$ 이하의 것만 포집하여 이 두 물질을 3A-2S의 比率로 혼합하여 高溫인 1350 ~ 1450$^{\circ}$C에서 燒成하여 反應速度를 測定하였다. 速度의 測定結果는 Jander의 式에 잘 맞았으며 Jander式의 修正式들이 만족할만한 결과를 주지 못하였다. 鑛化劑(mineralizer)를 넣었을 때는 같은 溫度에서 收率이 15% 정도 높았고 活成化 에너지는鑛化劑 를 넣지 않았을 때의 142kcal/mol보다 적은 90kcal/mol로反應 이 쉽게 진행됨을 보여 주었다. Purified kaolin and ${\alpha}$-$Al_2O_3$ particiles which are less then 10${\mu}$ in diameter were collected through sedimentation and mixed in the ratio of 3A-2S and then its reaction rates were measured at temperatures 1350 to 1450$^{\circ}$C. The kinetic data were correlated with Jander's equation, but not with modified Jander's equation. With mineralizer added, yield increased about 15% and activation energy decreased from 142kcal/mol to 90kcal/mol.
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EFFECT OF PORE STRUCTURE ON SO2 ADSORPTION EFFICIENCY
Park, Chan Young,Lee, Yong Choon,Chung, Soo Hyun,Sohn, Eun San 한국화학공학회 1990 Korean Journal of Chemical Engineering Vol.7 No.4
The influence of the impregnation concentration of copper nitrate in a porous alumina pellet on the SO₂ adsorption efficiency has been investigated. The mechanism of adsorption and pure clogging has been analysed on the basis of the partitioned pore structure model and the results has been compared with the experimental breakthrough curves. The complete conversion of the pellet was attained in the low concentration of impregnation. The breakthrough time could be increased by increasing the concentration in the range from 2.0 to 6.0 ㏖/ℓ copper nitrate solution when the SO₂ concentration was about 3000 ppm. The conversion rate. however, dropped rapidly as the pore clogging occurred at the higher concentration than the optimum level.
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Effect of Pore Structure on SO2 Adsorption Efficiency
Chung, Soo Hyun,Park, Chan Young,Lee, Yong Choon,Sohn, Eun San 한국화학공학회 1991 NICE Vol.9 No.1
The combined continuous and preparative gas-liquid chromatographic system was considered for separating continuously three close-boiling components, diethylether, dimethoxymethane, and dichlorornethane. Their concentration profiles were simulated by the mathematical model, which assumed the uniform distribution of stationary liquid phase and the linearity of the equilibrium isotherm. The operational principles of the system are that the least-absorbed component of the three compoents can be obtained purely before the elution of the most-absorbed components if the mixture is continuously injected into the one of the two sections(partition section) and at the same time, in the other section(desorption section), the three components remained in the column can be separated by the adjusting the experimental conditions and the column configuration. If the operations in the two sections are imultaneously finished within a time(switching time), continuous separations of the three components are feasible. The effect of the various operating conditions on the resolution is investigated. From the results of the simulations, the resolution is greatly affected by the additional column length in the deaurptim secticm and the switching time can be determined by the desorbent velocity.
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능동형 등온열량계를 이용한 Diels - Alder 반응의 열화학적 열저장현상 분석
김태성,박찬영,이광진,손은산,조종현,유민수 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3
전자회로와 컴퓨터를 이용하여 액상가역반응의 반응경로를 추적할 수 있는 능동형 등온열량계를 개발하였고 무수 말례인산과 2-메틸 퓨란간의 딜스-알더반응이 디옥산용매에서 일어날 때 그 축열능, 반응열, 반응평형정수 및 반응속도상수를 이 열량계로 얻어진 응답곡선으로부터 추산하였다. 이 반응혼합물의 축열능은 온도 338°K무수 말레인산 초기농도 7.0㏖/ℓ에서 그 최대값 6.89J/㎤K로 측정되었다. An active type isothermal calorimeter which can trace the progress of a liquid phase reversible reaction was constructed using electronic circuits and a digital computer. Heat storage capacity, heat of reaction, reaction equilibrium constant and reaction rate constants of a Diels-Alder reaction between maleic anhydride and 2-methyl furan in dioxane were estimated from the response curves of the calorimeter. The heat storage capacity of this mixture showed the maximum value of 6.89 J/㎤K at 338°K and 7.0 ㏖/ℓinitial concentration of maleic anhydride.
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