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이호원,지준영,김윤덕,Ho Won Lee,Jun-young Ji,Yoon-Duck Kim 대한안과학회 2005 대한안과학회지 Vol.46 No.2
Purpose: We report two cases of Burkitt’s lymphoma involving the orbit. Methods: A seven-month male presented with the chief complaint of a 15-day history of left upper lid swelling. Ocular examinations revealed left ptosis, inferior displacement of the left eyeball due to upper lid mass. Orbital MRI scan showed diffusely enhancing homogenous mass of the left orbit. Another twelve-month male visited our clinic with sudden onset of left proptosis, and his conjunctiva was exposed due to severe proptosis. Orbital MRI showed a mass on the medial portion of the contralateral eye, ipsilateral temporal bone and extradural space. In both cases, incisional biopsy was done. Results: Histopathologically, the lesions were characterized by a uniform background of large round or oval lymphocytes with multiple prominent nucleoli. Large, pale staining, benign phagocytic histiocytes or macrophages were interspersed within the collection of neoplastic lymphocytes. They showed a “starry sky appearance” and were positive for immunohistochemical stain against Ki-67 antigens. Conclusions: Burkitt’s lymphoma should be suspected and considered in the differential diagnosis for children with acutely progressing orbital mass.
특집: 미래주도형 성형공정과 수치 해석기술 - 소성가공공정에서의 미세조직 예측기술
이호원,강성훈,Lee, Ho-Won,Gang, Seong-Hun 재료연구소 2011 機械와 材料 Vol.23 No.3
기존의 소성가공공정에서의 미세조직 예측 기술은 온도 및 외력에 의한 금속학적 변화를 모사하기 위해 다수의 실험에 기반한 경험적 모델링 작업이 요구되고 이를 구현할 수 있는 기계 및 재료적 지식 기반이 동시에 요구되기 때문에 현재까지는 신뢰성을 갖는모델 및 수치해석기술은 충분히 확보되지 못한 상태이다. 이러한 미세조직 예측기술의 정확도를 향상시키고자 하는 일환으로, 최근에는 매크로 스케일의 FE 해석과의 결합을 통해 소성가공공정과 이후의 열처리 공정에서의 정적 재결정 동적 재결정 상변태 변형유기변태 등 복잡한 미세조직 현상을 그 변화가 일어나는 실제 메조 스케일에서 예측하고자 하는 연구가 시도되고 있다. 본고에서는 그 중에서도 소성가공에서 발생하는 재결정 거동 예측에 주로 적용되고 있는 데조스케일 해석 기법과 매크로-메조 다단위 스케일 해석 기법의 국내외 연구 현황에 대해 알아보고자 한다. 또한, 이를 이용한 소성가공공정에서의 미세조직 예측 사례와 미세조직 예측기술의 전망에 대해 기술하고자 한다.
중국산 (中國産) 인편성황갈조식물에 (鱗片性黃褐藻植物) 대한 연구
이호원,이상명 ( Ho Won Lee,Sang Myong Lee ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.4
The silica-scaled Chrysophyta from Tianjin, Beijing, Harbin, Jilin, Mt. Paektu and Shenyang in the P. R. China have been studied by means of electron microscope. 28 taxa of five genera were found; 9 taxa of Mallomonas, 2 taxa of Synura, 1 taxa of Chrysosphaerella, 3 taxa of Spiniferomonas and 13 taxa of Paraphysomonas. 9 taxa of them are new to the P.R. China.
(Ba,Sr)TiO<sub>3</sub>계 세라믹스의 PTCR 특성에 미치는 Sb<sub>2</sub>O<sub>3</sub>의 영향
이호원,김영민,어순철,김일호,Lee Ho-Won,Kim Young-Min,Ur Soon-Chul,Kim Il-Ho 한국재료학회 2004 한국재료학회지 Vol.14 No.2
Perovskite barium-strontium titanate, $(Ba, Sr)TiO_3$ was prepared and effects of $Sb_2$O$_3$ additives on its PTCR properties were investigated. $The (Ba,Sr)TiO_3$ with 0.05~0.25 mol% $Sb_2$$O_3$ showed semiconducting PTCR behavior and anomalous grain growth was also observed when it was sintered above $1330^{\circ}C$. It was considered that charge compensation by doping 8b203 as well as abnormal grain growth by sintering lead to resistivity reduction from insulating to semiconducting transition.
규칙 배열된 실관막을 이용한 투과추출에서 물질전달의 이론적 해석
이호원,김우식 ( Ho Won Lee,Woo Sik Kim ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.2
The purpose of this study is to clarify perstraction(permeation-extraction) factors and to analyze separation mechanism in perstraction using hollow fiber modules. The analytical solution on the concentration profiles in hollow fiber modules has been obtained. Also, using this solution, separation mechanism was analyzed by comparing the mass transfer rate changes according to the changes in perstraction factors such as the properties of hollow fibers, distribution coefficient, potting density, and the thickness, porosity and tortuosity of the hollow fibers. The analyses based on concentration profiles show that the mass transfer rate depends mainly on the solute diffusion in the membrane phase, and it has maximum values when the ratio of diameter to pitch is between 0.8-0.9. While hydrophilic membrane shows faster mass transfer rates in the system with the distribution coefficient less than 1, hydrophobic membrane shows faster mass transfer rates when the distribution coefficient is above 1.