Zn로 擴散된 GaAs 레이저 發振

文東纘 광운대학교 1977 論文集 Vol.6 No.-

Zn diffused laser diodes were fabricated from n-type GaAs:Te(??)with (100)orientation, Using ZnAs₂ as the diffusing species, diffusion was carried out at 850℃ in a quartz ampoule for 5, 10, 15 hrs. An annealing step followed in a sealed quartz tube at 900℃ for 5 hrs. The diodes had the dimension of 375㎛×750㎛ and 300㎛×600㎛. a SCR pulse generator was used as a power supply and a PM tube as a detector. A lasing threshold has been observed at liquid nitrogen temperature and 33,000A/㎠ with lasing wavelength of 8432Å.

磁場內에서의 原子스펙트럼 : Zeeman 效果의 理論을 中心으로

文東纘 광운대학교 1972 論文集 Vol.2 No.-

In 1892, P. Zeeman was discovered a fact that the spectrum in the magnetic field separated as doublet and triplet line. In this paper, it is summary on the theory of normal Zeeman effect by classical theory, atomic vector model and quantum theory, and the theory of anomalous effect in weak and strong magnetic field.

수직 Bridgman 법으로 성장된 비화학량론적 CdTe 결정의 특성

문동찬 光云大學校 1995 論文集 Vol.24 No.-

Nonstoichiometric CdTe crystals were grown by a vertcal Bridgman method. Te-rich CdTe crystal was grown with Te: Cd=1.001: 1, Cd-rich CdTe was Te:Cd=1:1 by atomic weight percent. Lattice constants of Te-rich CeTe and Cd-rkch CdTe by XRD were 6.4919Å, 6.4709Å respectively. The difference of lattice constant compared with stoichiometric CdTe, is due to the deviation of elements from stoichimetric composition. EPD were 3×10³-1.07×10⁴㎝-² for Te-rich CdTe and 2×3.43×10⁴㎝-²for Cd-rkch CdTe using by E-Ag solution for (111) plane. The carrier cincentration, the resistivity, and the Hall mobility were measured by the Ban der Pauw method. For Te-rich CdTe, p=5.78×10?㎝-³,p=5.78×10?㎝-³, ρ=20.197Ω㎝, μ?=75.64㎝²ν-¹sec-¹, and Cd-rkch CdTe CdTe had values of n=2.98×10?㎝-³, ρ=0.214Ω㎝, μ?=979.93㎝²ν-¹sec-¹, respectively. Conduction type conversion was occurred in Te-rich CdTe after 2 hours under Cd-atmosphere annealing at 600℃. The reason of type conversion was considered by the annihilation of Cd vacancy. But Cd-fich CdTe had not showed type conversion nuder Te-atmosphere annealing. This results was considered difference in vapor pressure between Cd and Te. Transmittance of Te-rich CdTe was 60% and that of Cd-rich CdTe was 65% nearly exact to the theorectical value of 65.3%. The difference in Transmittance of the Te-rich CdTe was considered due to Cd interstitials in that samples.

p-CdTe/n-CdS 태양전지 제작

文東纘 光云大學校 1979 論文集 Vol.8 No.-

p type single crystal was grown by Bridgman method. By X-ray diffraction, the lattice constant was found to be 6.477Å and by van der Pauw method, resistivity 2.06Ωcm,Hall mobility 181㎠/v-sec, and carrier concentration 1.7×10??cm??. p-CdTe/n-CdS Solar cells were fabricated by transporting CdS on CdTe substrate in Close-Spaced Vapor Transport method. Using solar cells, there were good voltage response over wide visible wavelength (from 5000Å to 8000Å) and the dependence of the voltage on light intensity linearly. The Open circuit voltage (Voc) and Short Ciruit current (Isc) were 0.24 volt, 1.72×10?? Ampere. The output power (10??watt) was very poor. we will improve power of solar cells in preparation for quartz Bell jar and high power tungsten-Iodine lamp in CSVT method

Cd 이 擴散된 InP 의 特性에 關한 硏究

文東纘 光云大學校 1984 論文集 Vol.13 No.-

Cd diffusion into n-InP which grown by the SSD method in our lab. was performed in a vacuum evacuated and sealed quartz ampoule. The diffusion depth was proportional to the square roots of diffusion time and decreased with increasing amount of P, surface hole concentration was ?? and it was not affected by the diffusion time but it was decreased with increasing amount of P. The activation energy and diffusion coefficient for Cd diffusion in InP was found to be 1.7eV, ??=0.11 exp(-1.7eV/??·T), respectively. The Cd diffused ??-n InP homojunction diodes revealed good rectifing characteristics and the ideality factor was approximated to 1 in the diffusion current dominant region. An abrupt junction can be formed by diffusion at temperature lower than 650℃ and diffusion time shorter than 9 hours, while a graded junction can be formed by higher temperature and higher diffusion time.

지난 2년간의 학회지 "신경정신의학" 심사 평가보고

김찬형,김세주,김도관,김성곤,박원명,송동호,박용천,이영문,오강섭,정영철,이상열,김주한,이동영,이헌정,함병주,김율리,김문두,김정진,이강욱,천근아,김재진,홍진표,홍승철 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

Al₂O₃ TiO₂ 담체종류별 Pt, PtRu 촉매의 산화특성

김문찬,신진실,이동구,최균 한국공업화학회 2005 응용화학 Vol.9 No.1

The volatile organic compounds (VOCs) have been recognized as major contributor to air pollution. The catalytic oxidation is one of the most important processes for VOCs destruction clue to getting high efficiency at low temperature. In this study, mono metallic Pt and bimetallic Pt-Ru were supported to TiO₂ and γ-Al₂O₃. In order to distribute metals uniformly, Xylene, toluene and MEK were used as reactants. The mono metallic or bimetallic catalysts were prepared by the excess wetness impregnation method and were characterized by XRD, XPS, TEM and BET analysis. As a result, Pt-Ru bimetallic catalysts were showed higher conversion than Pt mono metallic catalyst. Pt-Ru bimetallic catalyst was showed highest conversion on the γ-Al₂O₃support. In the VOCs oxidation, Pt-Ru bimetallic catalyst had multi point active sites, so it improved the range of Pt metal state. Therefore, bimetallic catalysts were higher conversion of VOCs than mono metallic ones.

PR 접합부를 고려한 철골 모멘트 골조의 시스템 연성요구도 산정

이찬문,최원호,이동근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

There are various methods that have been recommended for seismic performance of a building structure such as Displacement Coefficient Method, Capacity Spectrum Method, Direct Capacity Spectrum Method, Modal Pushover Analysis etc. Evaluation of seismic performance based on the these methods generally used for estimation of seismic deformation capacity and demand of a building structure in the performance based earthquake engineering. In this study, we can find out that the change of pushover curve considering PH connection and P-Delta effects makes a performance point different, too. Also prediction of system ductility demand for steel moment frame Compare to each system, and Capacity Spectrum Method is used to seismic performance of a building structure.

다양한 해석법을 이용한 고층건물의 비선형 거동예측

이찬문,최원호,이동근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

There are various methods that have been recommended for seismic performance of a building structure such as Displacement coefficient Method, Capacity Spectrum Method, Direct Capacity Spectrum Method, Modal Pushover Analysis etc. Evaluation of seismic performance based on the these methods generally used for estimation of seismic deformation capacity and demand of a building structure in the performance based earthquake engineering. In this study, a new improved method of seismic performance evaluation for a high-rise steel moment frame building, which take into account the higher mode effects and accurate inelastic seismic responses, is presented. And the various approaches including the proposed method are carried out for estimating deformation capacity for a high-rise building subjected to various earthquake ground motions and compared with responses such as plastic hinge formations, interstory drifts and energy dissipation etc. of inelastic time history analysis.

직류 서보 전동기를 대상으로한 적응퍼지속도제어기의 설계

김호찬,조성범,문동춘,고봉운 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

This paper presents a study of the performance of a DC servo motor with a model reference adaptive fuzzy speed controller (MRAFSC) in the presences of load disturbances. MRAFSC comprised inner feedback loop consisting of the fuzzy logic controller (FLC) and plant, and outer loop consisting of an adaptation mechanism which is designed for tuning a control rule of the FLC. Experimental results show the good performance in the DC servo motor system with the proposed adaptive fuzzy controller.