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( O / W ) / O 에멀젼형 액막을 이용한 탄화수소 혼합물의 분리
정민조,박함용,오준택,김종국,신명훈,김우식 ( M . C . Jeong,H . Y . Park,J . T . Oh,J . K . Kim,M . H . Shin,W . S . Kim ) 한국공업화학회 1997 공업화학 Vol.8 No.5
(O/W)/O 에멀젼형 액막을 이용하여 비점이 비슷한 벤젠-싸이클로헥산 혼합물을 분리하였다. 액막 제조 조건이 선택도, 회수율 및 에멀젼 액적의 크기에 주는 영향을 고찰하였으며, 다단 맥동 추출탑을 이용한 연속 추출 실험을 통하여 비정상상태와 정상상태에서의 추출거동을 검토하였다. 추출실험결과 유화 교반 속도 4000rpm, Tween 80 농도 0.4 %, 내유상에 대한 막상의 부피비 0.75, 연속상에 대한 분산상의 부피비 0.5, 투과시간 10 분에서 선택도 및 벤젠의 회수율이 가장 좋았다. 에멀젼 액적의 크기 분포 측정 결과, 교반속도가 커질수록 또는 분산상의 microdrop holdup이 작을수록 분산상 액적의 평균크기가 작았으며, 분산상 microdrop holdup의 영향을 고려한 modified Calabrese의 식을 적용한 결과 turbulence damping constant의 값은 2.28이었다. 연속 추출 실험 결과 탑내 교반속도 300rpm, 맥동 횟수 2times/sec, 연속상 유속 30ml/min, 에먼젼상 유속 12.0ml/min에서 가장 좋은 추출 효과를 얻을 수 있었다. The separation of benzene-cyclohexane mixture using (O/W)/O emulsion liquid membrane was studied. The operating parameters which can affect the selectivity, benzene yield, and emulsion size distribution were examined and determined by the batch type operation. The unsteady state and steady state extraction behavior in continuous pulse stirred reactor(CPSR) were verified. The optimum conditions for benzene selectivity and yield in batch operation were as follows; emulsion mixing intensity 4000 rpm, Tween 80 concentration 0.4%, volume ratio of membrane phase to internal phase 0.75, volume ratio of dispersed phase to continuous phase 0.5, and permeation time 10 minutes, As impeller speed increased and the microdrop holdup decreased, the Sauter mean diameter decreased. Turbulence damping parameter of modified Calabrese correlation considering microdrop holdup was 2.28. The optimum conditions of continuous operation were as follows; agitation speed 300 rpm, pulse frequence 2 times/sec, flow rate of continuous phase 30 ml/min, and flow rate of emulsion phase 12.0 ml/min.
이상종 ( S. J. Lee ),김종국 ( C. K. Kim ),백정민 ( J. M. Paik ),김학설 ( H. Y. Kim ) 대한내과학회 1972 대한내과학회지 Vol.15 No.7
Though the many investigations have stressed on occurence of abnormal glucose metabolism following the prolonged thiazide administration, there are lacking studies on this subjects in this country. The standard oral glucose tolerance test was undertaken in
趙庸均,辛源春,金鐘國,劉泰煥,金福麟,李鴻均 인제대학교 1994 仁濟醫學 Vol.15 No.2
부인과 질환중 상당한 비율을 차지하고 있는 자궁선근증의 빈도, 증상, 동반된 질환 및 수술전 진단의 가능성 등을 조사하여 수술전 진단의 정확성을 높임으로써 효과적인 치료를 할 수 있게 하기 위하여 본 연구를 시행하게 되었다. Adenomyosis is a singular disease whose diagnosis frequently eludes the physician. In spite of the fact that it causes distressing and often serious functional disturbances requiring major operation for correction, many physicians, even gynecologists, tend to neglect the possibilty of this entity Adenomyosis was encountered in 199 cases or 25.5% of the surgically removed uteri from women who had been admitted to Sanggye Paik Hospital from Sep. 1, 1989, to Dec. 31, 1992. The peak incidence was in the fifth decade (51.8%), in late reproductive life or early menopausal years. Of the 199 patients, 186 (93.5%) were parous and 13 (6.5%) were nulliparous. Menorrhagia, metrorrhagia, pelvic pain, lumbago, and dysmenorrhea were common symptoms in this study and 17 patients (8.6%) had no symptoms. In comparing uterine weight in those cases wish and without associated myoma, we find the distribution is similar in both groups except for a larger number of uteri in the "under 120gms without myoma" category. Preoperative diagnosis of the adenomyosis was possible in only 3.5% Leiomyoma was the most common associated disease with adenomyosis and the incindence was 39.7%. Proliferative phase of the endometrium was the most frequent endometrial findings, an incidence of 51.8%, and the secretory phase, 29.1%.
윤중호,차인호,서창호,김종국,최용석,김형준 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.1
Myoepithelioma is composed exclusively of myoepithelial cells. Myoepithelial cells are ectodermally derived contractile cells that can be routinely identified in many normal tissues having secretory function such as major and minor salivary glands, lacrimal gland and sweat gland. Tumors composed exclusively of myoepithelial cells, so-called myoepitheliomas, are rare-less than 1% of all salivary gland tumors. Grossly, these tumors are well demarcated. The external surface is smooth and may be bosselated. The cut surface is white and homogenous. Microscopically, these tumors are surrounded by a thin fibrous capsule. They are composed of benign-appearing spindle- shaped and/or polygonal cells. Mitoses are rare. Frequently these tumors contain myxomatous stroma which is susceptible to alcial blue stain. Clinically, myoepitheliomas present as slow-glowing, painless masses and can not distinguished from pleomorphic adenomas. Treatment is the same as for pleomorphic adenoma, and the surgical excision should include a margin of normal tissue. Although the majority of myoepitheliomas have behaved in a beingn manner, pleomorphism and mitotic activity have been associated with local aggressiveness.