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이재현,이헌주,Lee, J.H.,Lee, H.J. Korean Society of Electron Microscopy 1984 Applied microscopy Vol.14 No.2
난소절제한 흰쥐에서 $17{\beta}$-estradiol과 progesterone을 장기간 주사햐여 자궁상피의 형태적 변화를 전자현미경으로 관찰하였다. 난소절제 후 자궁상피는 막성구조물과 지방구 기타의 구조물을 포함하는 vacuole의 출현이 특이적으로 나타났다. 상피는 낮은 입방형이며 세포 유리면에 소수의 짧은 microvilli를 볼 수 있었다. Estradiol투여시 상피는 높은 윈주형을 나타내며, 분비계는 비교적 잘 발달되고, 세포 유리면에 소수의 긴 microvilli도 관찰되었다. Progesterone 처리시의 상피는 세포 첨단부에 다수의 vacuole과 핵하부에 다수의 지방구의 집적이 관찰되었다. 이상의 결과로 보아 자궁상피는 형태학적 및 기능적인 상태에서 estrogen과 Progesterone 양자에 의해 변화를 받으며 이들 호르몬은 상피세포에 대해 독특한 영향을 나타낸다고 생각된다. Morphological changes of the epithelium of the endometrium by prolonged treatment of $17{\beta}$-estradiol or progesterone in ovariectomized rats was studied at the ultrastructural level. The epithelium of the endometrium in ovariectomized rats was characterized by the appearance of a number of vacuoles which was contained with the membraneous structures, lipid droplets and the others. The epithelium was low cuboidal, and a few short microvilli were present at the cell surface. Secretory granules are rarely found. After estradiol treatment, the epithelium was high columnar in shape. The mitochondria was appeared throughout the cytoplasm, however, long or swelling mitochondria was often found. Golgi apparatus and rER were relatively well-developed. Relatively long and sparse microvilli were present at the cell surface. After progesterone treatment, the epithelium was characterized by the appearance of numerous vesicles at the apical region and numerous lipid droplets at the subnuclear region. At the cell surface a number of short and blunt microvilli were found. These data indicated that the endometrium was dependent on estrogen and progesterone for changes in both its morphological and functional state and suggested that each hormone exerted a unique effect on the epithelial cells.
용체화 처리된 주조용 CD4MCU 이상 스테인리스강의 질소 첨가에 따른 인장 및 부식거동
손진일(J. L. Son),김상식(S. S. Kim),이재현(J. H. Lee),최병호(B. H. Choi) 대한금속재료학회 ( 구 대한금속학회 ) 2002 대한금속·재료학회지 Vol.40 No.9
Effect of nitrogen contents on the microstructure, tensile and corrosion behaviors of as-solutionized CD4MCU (Fe-25Cr-5Ni-2.8Cu-2Mo) cast duplex stainless steel was examined in the present study. The slow strain rate test was conducted at a nominal strain rate of 1×10^(-6)/sec in air and 3.5% NaCl+5% H2SO4 solution for studying the stress corrosion cracking behavior of the present alloy. It was observed that the volume fraction of austenitic phase in CD4MCU alloy increased from 38% to 58% with increasing nitrogen content from 0 to 0.27 wt.%. The tensile behavior of CD4MCU alloy showed a complex trend depending on the volume fraction and shape of austentic phases as associated with nitrogen content. The resistance to general corrosion of CD4MCU alloy was significantly improved with the addition of nitrogen. The difference in the magnitude of the improvement with different nitrogen contents was, however, not significant for the present alloy. The % change in tensile elongation in 3.5% NaCl+5% H2SO4 solution with respect to air for slow strain rate test was gradually reduced with increasing nitrogen content up to 0.27%. The stress corrosion cracks observed in high-nitrogen CD4MCU alloy was confined within the ferritic phases and not fully developed to the sharp cracks due to the globular shaped austenitic phases.
이재현,Lee, J.H. 한국현미경학회 1982 Applied microscopy Vol.12 No.2
The parotid glands of squirrels(Tamias sibiricus asiaticus) were observed by the electron microscope. According to the characteristics of secretory granules and the morphology of cell organelles, the acinar cells could be distinguished into five types of cells(Type I , Type II, Type III, Type IV and Type V cell). Among these, Type III, Type IV and Type V cell were not identified up to date. The morphologic characteristics of the intercalated and striated ducts were the appearance of numerous long slender mitochondria which are located between the numerous basal infoldings, and the epithelium were consisted of light and dark cells. The desmosomes were also observed, and could not found the secretory granules in the cytoplasm of the both epithelium.
회로 및 수식 기반의 혼합 모델링을 이용한 7상 영구자석 브러시리스 전동기의 시뮬레이션 모델
이재현(J.H Lee),목형수(H.S Mok),최규하(G.H Choe),이정민(J.M Lee),김상훈(S.H Kim) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
영구자석을 이용한 다상 브러시리스 전동기의 역기전력의 파형은 정현파나 이상적인 사다리꼴 파형과는 다른 형태를 갖는다. 또한 다상 전동기의 경우 상호인덕턴스에 대한 이론적 해석이 쉽지 않아 시뮬레이션을 위한 모델 구현이 어렵다. 본 논문에서는 임의의 역기전력 파형을 갖는 7상 영구자석 브러시리스 전동기의 시뮬레이션 모델 구현 방법으로 회로 및 수식을 기반으로 FEA(Finite Element Analysis)를 이용한 모델을 제안하고 시뮬레이션과 실험을 통해 제안된 모델의 타당성을 입증한다.
풍력 발전 블레이드 Trailing Edge 부에서의 손상 감지 기법
이재현(J.H. Lee),허용학(Y.H. Huh),김동진(D.J. Kim),김종일(J.I. Kim),이건창(G.C. Lee),이영신(Y.S. Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this Study, in order to monitor the operational safety in wind turbine blade, damage detection technique was developed. The damage occurred in the blade was detected with measurement of local strain which was sensed with PVDF strain sensor. The blade components including trailing edge were manufactured. To detect the local damage, lots of strain gages and PVDF film sensors were mounted on the shear web and skin of the blade component. From the test, optimal location for detecting the occurrence of damage with static loading was investigated and sensitivity of the PVDF sensors location to the damage was examined. With increasing the applied load, pop-ins were happened. The strain variation of the PVDF sensors was characterized. From this study, PVDF strain sensor was found to be very useful in detecting the damage in wind turbine blade.