http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최영진(Y. J. Choi),장세종(S. J. Jang),김상욱(S. W. Kim),전병서(B. S. Jeon),김상무(S. M. Kim),송창빈(C. B. Song),김용찬(Y. C. Kim),남궁정(J. Namkung) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.1
This study was carried out to investigate a influence of humidity variation (%) on the magnetic properties and the surface flaws in the fabrication of Fe-based Fe78Si9B13 amorphous alloy ribbon by Planar Flow Casting process. As a result, the size of the air pocket and the droplet which is observed in the contact surface and the free face of the amorphous alloy ribbon becomes large when the humidity increases and the size highly increases with the surface roughness at the same time. Especially, the surface roughness value which is made in the 65 % of the humidity is the lowest in the contact surface (Ra = 0.60 μm, Rz = 3.11 μm) and the free face (Ra = 0.47 μm, Rz = 3.00 μm). Also, in case of the soft magnetic property of the magnetic core which is made with the toroidal core of 23(OD)*20(ID)*20(H) size, in the sample of the amorphous alloy ribbon which is made in 65% of the humidity, the most excellent value is gained as Bs(B<SUB>700</SUB>) = 1.055 T, H<SUB>c</SUB> = 0.083 Oe, permeability = 1,197 and core loss = 0.276W/kg.
[論文] 보올형상과 선회비에 따른 디젤기관 실린더내의 유동장 해석
최영진(Y. J. Choi),양희천(H. C. Yang),유홍선(H. S. Ryou),최영기(Y. K. Choi) 한국자동차공학회 1991 오토저널 Vol.13 No.2
There are many factors which influence on the performance of a diesel engine. The piston bowl shape and swirl ratio are important factors to enhance the fuel-air mixing and flame propagation.<br/> In this study, calculations of the flow field in the cylinder of the diesel engine were carried out using the CONCHAS-SPRAY code for different bowl shapes and swirl ratios.<br/> In the case of constant swirl ratio, vortices which affect fuel-air mixing, evaporation and flame propagation are generated more strongly and consistently in the bowl-piston type combustion chamber than in the flat piston type. With this strong squish effect, injected fuel droplets are widely diffused and rapidly evaporated in the bowl-piston type combustion chamber. Especially a strong squish is developed and large and strong vortices are generated in the edge cutted bowl piston chamber.<br/> As the swirl ratio increases, it is found that a large and strong squish and vortices are generated in the combustion chamber and also fuel droplets are diffused into the entire combustion chamber.
철기(Fe Based) 나노결정질 합금 분말코어의 코팅제 및 입도가 연자기적 특성에 미치는 영향
장세종(S. J. Jang),최영진(Y. J. Choi),김상욱(S. W. Kim),전병서(B. S. Jeon),이태행(T. H. Lee),송창빈(C. B. Song),남궁정(J. Namkung) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.3
This is a basic research for improving soft magnetic property of Fe based nano crystalline alloy powder core. The main study is done around characteristics of permeability, core loss, and DC bias depending on amount of insulation coating agent and particle size. First, Fe<SUB>73.5</SUB>Si<SUB>13.5</SUB>B<SUB>9</SUB>Nb₃Cu₁ amorphous alloy ribbon was fabricated by using the planar flow casting (PFC) device. Then, heat treatment and ball milling were done to obtain alloy powder. The amount of polyether imide (PEI) added to it was varied by 0.5, 1.0, 2.0, 2.5 wt% to have compression molding into 16 ton/㎠. After going through crystalline heat treatment, the made toroidal nano crystalline powder core (OD12.7 mm*ID7.62 mm*H4.75 mm) had smaller permeability as amount of insulation coating agent decreases. However, it was found out that core loss and DC bias characteristics have been improved. The reason for this results were expected to be because green density of power core decreases as amorphous alloy powder particles become smaller as amount of alloy powder insulation coating agent increases, it was determined that 1 wt% of insulation coating agent is appropriate. Also, for powder core made based on alloy powder size with amount of insulation coating agent fixed at 1 wt%, effective permeability and core loss were outstanding as particle size became bigger. However, characteristics of DC bias became worse as applied DC field increases. This is expected to be due to insulation effect, residual pores, or molding density of powder core resulting from thickness of coating on surface of alloy powder.
지미경,최영진,양기화,김병기,김선무,Jee, M.K.,Choi, Y.I.,Yang, K.W.,Kim, B.K.,Kim, S.M. 대한세포병리학회 1990 대한세포병리학회지 Vol.1 No.1
A case of primary non-clear-cell adenocarcinoma of the vagina is reported occurring in a 65-year-old woman without exposure to diethylstilbestrol (DES) in utero. The adenocarcinoma did not appear to be associated with vaginal adenosis. It lacked clear cell component and interestingly composed of columnar epithelial cells of endocervical-type. Cytologically round to oval nuclei revealed one or more small nucleoli and fine granular chromatin pattern. Cytoplasm was plump, faintly basophilic and homogeneously stained. Histologically well differentiated columnar epithelial cells were arranged on trabecular pattern mainly, and also occasional glandular lumina and small solid sheets were found. Mitoses were hardly found.