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허태녕,차상윤,장민수 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.11
The phase transformation of mixture of Y₂O₃, BaCO₃ and CuO powders with mole ratio of 1/2 : 2 : 3 and that of the superconducting Y₁Ba₂Cu₃Oy single phase were investigated by thermal gravimetric and differential thermal analysis between the temperature ranges of 20℃ and 1300℃. Above 1010℃, partial melting and phase decomposition of Y₁Ba₂Cu₃Oy single phase was detected and it was found that the new phases were (Y₂BaCuO_5) and BaCuO₂by SEM -EDX. By considering the change of the thermal expansion coefficient of the superconductor bar with temperature, it was concluded that superconducting Y₁Ba₂Cu₃Oy undergoes phase transformation at 400℃ and 700℃.
객체 지향형 프로그램에 의한 유한 요소법 코드 개발에 관한 연구
사종엽,채은미,이철욱,성윤제,허준성,편상욱,강태영 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1
A computer code of finite element method is developed by using the ?? programming language. The concept of class, inheritance, and polymorphism in ?? improves the modularity and the flexibility(such as potability, implantability, and expandability) of engineering software. The graphic user interface (GUI) is designed by using the MFC(Microsoft Foundation Class) based on ??, and combined successfully with the main code of FEM solver. This study shows the superior of OOP(Object-Oriented programming) such as ?? to other progamming languages when applied to complicated engineering problems.
이석윤,허명수,손동수,황병철,조동율,천희곤,오태희,송병무,송한식,이우형,이광철,김오규,권영규,구경완 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
The thin film growing processes and the photolithographic techniques involved in the manufacturing of thin film magnetic heads are discussed. The thin film heads are composed of the hundreds of electromagnetic transducers on a single wafer and are made of Al_(2)O_(3)-TiC substrate on which Al_(2)O_(3) film as a insulating, protective layer and gap material, Cu film as a multi-turn coil and permalloy film as a magnetic material are deposited and patterned. In this article we will introduce how the thin film heads is fabricated and differ from an integrated semiconductor device. An effort is devoted to develop the formation of PR frame using a lithography process and finally the thin film heads manufacturing technologies.
FIRE를 이용한 디젤 엔진 연소, NOx 및 매연 모사 계산 및 검증
허강열(Kang. Y. Huh),이용운(Yongun Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In this study parametric investigation is performed for a diesel engine with respect to EGR rate, injection timing. The engine is a heavy duty diesel engine operated with early injection timings to simulate an HCCI engine mode at a low rpm. The commercial code FIRE is employed for prediction of in-cylinder spray, combustion and production of NOx and soot emissions. Different sprays models including no breakup with a fixed SMD and Huh-Gosman model are tested for comparison with measurements. The Arrhenius type Shell ignition model is used with the standard set of constants for autoignition. The eddy dissipation model and characteristic time scale model are used for comparison during premixed and diffusion controlled combustion phases. Models for spray atomization and turbulent combustion involve some arbitrary constants, which require tuning for given specific cases. However results do not show much dependence on choice of the constants in reasonable ranges. Simulation results agree well with the measured data set for pressure traces, NOx and soot emissions for all 9 parametric cases.
( M. S. Kwon ),( H. L. Park ),( T. W. Kim ),( Y. Huh ),( W. Choi ),( J. Y. Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 METALS AND MATERIALS International Vol.12 No.3
We synthesized nanocrystalline Y2O3:Eu phosphor by a novel sol-gel route using simple metal nitrates and alcohols as the starting materials instead of oxide powders and nitric acid. The structural characteristics and luminescence properties of the sol-gel derived nanocrystalline Y2O3:Eu phosphor were studied by X-ray diffraction, transmission electron microscopy, and photoluminescence measurement. The crystallized crystal size increased from 7 to 55 nm as the firing temperature was increased from 500 to 1000℃. The red-emitting luminescence dominated by the 5D0-7F2 transition of the Eu(3+) ions. The intensity of the red luminescence increased with increasing firing temperature, and concentration quenching was observed with increasing Eu3(+) concentration.
허규열,고행일,김성연,고일향,김예회 인제대학교 1980 仁濟醫學 Vol.1 No.2
1977년 8월부터 1980년 7월까지 인제의대 부속 백 병원에서 13예의 자발성 골수종 환자를 관찰한 바 남녀의 비는 1.8 : 1이었으며 남자의 평균 연령은 51.4세, 여자의 평균 연령은 53.6세였다. 임상증상은 골동통이 77%에서 있었으며 류마치스성관절염, 퇴행성관절염, 신질환등으로 초진된 경우가 많았다. 혈액소견상 빈혈이 92%에서, 증가된 적혈구침강속도가 전체환자에서, 말초혈액소견상 형질세포화한 림파구가 31%에 있었다. 생화학검사는 총단백의 증가가 62%, 고칼슘혈증이 31%, 질소혈증이 69%, 고뇨산증이 89%, hypergammaglobulinemia가 38%에서 나타났다. 12예에서 전기영동을 시행한 결과 M-단백이 γ-region에 8예, β-region 3예, α2-region에 1예로 나타났다. 면역전기영동은 9예에서 시행결과 IgG 44%, IgA 22%, IgD 22%, light chain 11%였다. 방사선과적 검사는 85%에서 골용성병변이 있었으며 두개골 척추골 늑골 골반등의 순으로 있었다. 치료는 melphalan+prednisone이나 cyclophosphamide+prednisone을 사용하여 좋은 결과를 얻을 수 있었으며 melphalan 또는 cyclphosophamide 등의 alkylating agent와 prednisone 병용에 반응을 보이지 않은 환자에서는 제 2차적인 치료법으로 CCNU, Adriamycin 및 vincrstine을 이용한 병용요법을 시행하여 효과를 보았다. From August 1977 to July 1980, thirteen cases of multiple myeloma had been admitted to Paik Hospital, Inje Medical College. The ratio of male to female was 1.8 1 and the mean age was 51.4 years old in man and 53.6 years old in woman. The most common clinical findings were bone pain and tenderness. There were many cases which had been impressed as rheumatoid arthritis, degenerative arthritis, or renal problem at first medical examination. Hematologic findings were anemia in 92%, elevated E.S.R. in 100%, and plasmacytoid lymphocyte in 31%. Blood chemistry showed increased total protein in 62%, azotemia in 69%, hyperuricemia in 89%, hyperglobulinemia in 38%, and hypercalcemia in 31%. Serum protein electrophoresis in 12 cases revealed that M-spike was present in γ-region in 8 cases, in β-region in 3 cases and in α2-region in one case. Immunoelectrophoresis in 9 cases showed Ig G in 44%, Ig A in 22%, Ig D in 22% and light chain in 11%. Osteolytic lesions were noted in 85% and involed skull, spine and ribs in order. All 13 patients were treated with alkylating agent (melphalan or cyclophosphamide) and prednisone. Patients, who did not show response to the alkylating agent, were treated with CCNU, Adriamycin and vincristine in combination. Of 13 patients, six patients were lost to follow-up. One patient who had severe renal failure at the tinge of admission was dead during chemotherapy in conjuction with dialysis. Three patients survived 11, 13 and 32 moths each. The remaining three patients are still alive and well from 3+ months to 25+ months after initiation of chemotherapy.
박막 확산대의 상변화에 미치는 탄성응력과계면 반응장벽의 영향
許株烈,洪種波 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.4
An explicit, finite difference scheme has been used to simulate the influence of coherency stresses and interface kinetic barriers on the phase evolution of a binary, thin-film diffusion couple. Thin-films, initially consisting of alternating layers of two terminal phases α and γ, were held at a temperature where the formation of an intermediate phase β at α/γ interface was thermodynamically probable. In the absence of both the coherency stresses and interface kinetic barriers, β phase nucleates to grow at the beginning of the phase evolution and all phase compositions at interfaces are constant during the evolution. When either the coherency stresses or interface kinetic barriers are present, however, the interfacial compositions become time-dependent and thus the following characteristics of phase evolution are possible: (1) thermodynamically stable phase β does not form at the early stages of the evolution but nucleates to grow in the middle of the evolution, and (2) thermodynamically unstable phase β can initially nucleate to grow and then shrink to disappear during the evolution. Even if the initial states of α/γ multilayers have the same overall composition, the presence of coherency constraint can result in different final equilibrium states depending on either the initial phase compositions of α and γ or the magnitude of interface kinetic barriers.