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Ar/$O_2$에 따른 ZnO 박막의 C-축 배향성에 관한 연구
이동윤,박용욱,남산,이전국,김현재,윤석진,황금찬,Lee, Dong-Yoon,Park, Yong-Wook,Nam, Sahn,Lee, Jeon-Kook,Kim, Hyun-Jai,Yoon, Seok-Jin,Whang, Keum-Chan 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.7
Zinc Oxide(ZnO) thin films on Si(100) substrate were deposited by RF magnetron reactive sputtering. The charcteristics of ZnO thin films on argon/oxygen(Ar/O$_2$)gas ratios RF power and substrate temperature were investigated by XRD, SEM, and AFM analyses. C-axis preferred orientation resistivity and surface roughness highly depended on Ar/O$_2$gas ratios. The resistivity of ZnO thin films rapidly increased with increasing oxygen ratio and the resistivity value of 9$\times$10$^{7}$ $\Omega$cm was obtained at a working pressure of 10 mTorr with Ar/O$_2$=50/50. The surface roughness was also improved with increasing oxygen ratio and the ZnO films deposited with Ar/O$_2$=50/50 showed the excellent roughness value of 28.7$\AA$.
이동윤,윤석진,Lee, Dong-Yoon,Yoon, Seok-Jin 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
The structural and electrical property of RF magnetron sputtered ZnO thin film have been studied as a function of RF power, substrate temperature, oxygen/argon gas ratio and film thickness at constant sputtering power, sputtering working pressure and target-substrate distance. To analyze a crystallo-graphic properties of the films, $\theta$/2$\theta$ mode X-ray diffraction, SEM, and AFM analyses. C-axis preferred orientation, resistivity and surface roughness highly depended on oxygen/argon gas ratio. The resistivity of ZnO thin film(6000 ${\AA}$) rapidly increased with increasing oxygen ratio and the resistivity value of $9 {\ast} 10^7 {\Omega}cm$ was obtained at a working pressure of 10 mTorr with the same oxygen/argon gas ratio. The surface roughness was also improved with increasing oxygen ratio and the ZnO films deposited with the same oxygen/argon gas ratio showed the excellent roughness value of 28.7 ${\AA}$. With increase of the substrate temperature, The C-axis preferred orientation of ZnO thin film increases and the resistivity decreases due to deviation from the stoichiometric ZnO due to oxygen deficiency.
염료감응형 태양전지와 열전발전소자를 결합한 복합 태양전지의 구조 및 특성
이동윤,송재성,이원재,김인성,정순종,Lee, Dong-Yoon,Song, Jae-Sung,Lee, Won-Jae,Kim, In-Sung,Jeong, Soon-Jong 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.4
The tandem solar cell composed of a dye-sensitized solar cell (DSC) and a thermoelectric generator (TEG) was designed. In such new cell, the characteristics of DSC and TEG were investigated. DSC uses the wavelength range of 380∼750 nm and has the maximum efficiency of below 10 %. If the solar light transmitted through DSC can be converted to heat energy, TEG can generate electric energy using this heat energy. By this means, it is possible to utilize most of solar energy in the wavelength range of 350∼3000 nm for electric generation and it can be expected to obtain higher solar energy conversion efficiency exceeding the known limit of maximum efficiency. For this purpose we suggest the tandem solar cell constructed with DSC and TEG. In this structure, DSC has a carbon nanotube film as a counter electrode of DSC in order to collect the solar light and convert it to heat energy. We measured the I-V characteristics of DSC and TEG, assembled to the tandem cell. As a result, it was shown that DSC with carbon nanotube and TEG had the efficiency of 9.1 % and 6.2 %, respectively. From this results, it is expected that the tandem solar cell of the new design has the possibility of enhanced conversion efficiency to exceed above 15 %.
범밀도함수법을 이용하여 계산한 IIIB족 원소가 도핑된 ZnO의 전자상태
이동윤,이원재,민복기,김인성,송재성,김양수,Lee, Dong-Yoon,Lee, Won-Jae,Min, Bok-Ki,Kim, In-Sung,Song, Jae-Sung,Kim, Yang-Soo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.7
The electronic states of ZnO doped with Al, Ga and In, which belong to III family elements in periodic table, were calculated using the density functional theory. In this study, the calculation was performed by two Programs; the discrete variational Xa (DV-Xa) method, which is a sort of molecular orbital full potential method; Vienna Ab-initio Simulation Package (VASP), which is a sort of pseudo potential method. The fundamental mixed orbital structure in each energy level near the Fermi level was investigated with simple model using DV-Xa. The optimized crystal structures calculated by VASP were compared to the measured structures. The density of state and the energy levels of dopant elements were shown and discussed in association with properties.
탈황석고의 처리방법변화가 고로슬래그 미분말 다량 치환 모르타르의 공학적 특성에 미치는 영향
이동윤(Lee, Dong-Yoon),한천구(Han, Cheon-Goo) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.2
In this research, the influence of desulfurized gypsum (FGD) with different carbon removing methods of 0.3 mm sieving, and 500℃ high temperature combustion on high volume blast furnace slag cement mortar was evaluated with different replacement ratios of 1 : 2, and 1 : 4 for blast furnace slag. As an experiment result, flow was generally decreased with FGD replacing while slight increased was shown with 5 to 10 % of replacement for 1 : 4 mortar. As FGD replacement, air content was reduced setting time was shortened. Compressive strength was generally decreased with 1 : 2 mortar mixtures, but for 1 : 4 mortar mixture, the highest compressive strength value was obtained when FGD was replaced about 10 % due to the generation of ettringite. Drying shrinkage was decreased and absorption rate was increased with increased FGD replacement ratio. Overall, as a carbon removing method of FGD, 0.3 mm sieving showed better results than 500℃ high temperature combustion, and the mortar mixture was the most appropriate results were obtained with 1 : 4 mixture and 10 % of FGD replacement ratio.
이동윤 ( Lee Dong Yoon ),예철해 ( Ye Cheol Hae ) 충남대학교 교육연구소 2021 교육연구논총 Vol.42 No.3
특수교육에 대한 철학적 연구는 그 필요성에 비해 활발히 이루어지고 있지 않다. 이에 연구자는 마르틴 부버의 교육철학에 대해 고찰하고 통합교육적 함의를 탐구하고자 하였다. 연구 결과 다음과 같은 결론을 도출할 수 있었다. 첫째, 부버의 존재론은 교사는 통합교육을 적극적으로 수용해야함을 역설한다. 교육은 “비에로스적”이어야 하므로, 선택적인 교육은 포용적 관계가 될 수 없다. 둘째, 부버의 ‘교육적 관계’의 개념은 통합교육의 이론적 근거가 된다. 부버의 교육적 관계는 교사가 학생을 일방적으로 포용하는 관계를 말하는데, 통합교육은 이에 부합한다. 셋째, 부버는 잠재적 교육과 인성교육을 강조하였으며, 이는 통합교육과 결부될 수 있다. Philosophical research on special education is not being actively conducted compared to its necessity. Accordingly, the researcher tried to examine Martin Buber's educational philosophy and explore the implications of inclusive education. As a result of the study, the following conclusions could be drawn. First, Buber's ontology emphasizes that teachers should actively accept inclusive education. Since education must be “non-erosive”, selective education cannot be an relationship of inclusion. Second, Buber's concept of 'educational relationship' serves as the theoretical basis for inclusive education. Buber's educational relationship refers to a relationship in which a teacher inclusives students unilaterally, and inclusive education corresponds to this. Third, Buber emphasized potential education and character education, which can be combined with inclusive education.
Zero-valent Iron와 Granular Activated Carbon의 조합공정을 이용한 Fenitrothion의 제거에 관한 연구
이동윤(Dong Yoon Lee),문병현(Byung Hyun Moon) 한국유화학회 2009 한국응용과학기술학회지 Vol.27 No.3
This study investigated the decomposition of fenitrothion in Smithion, which is applied on the golf course for pesticide, by the integrated Zero-valent iron(ZVI) and Granular activated carbon(GAC) process. First, the removal efficiencies of the fenitrothion by ZVI and GAC, respectively, were investigated. Second, the removal efficiencies of the fenitrothion by the integrated ZVI and GAC were investigated. The removal efficiencies of fenitrothion by ZVI were higher than those of TOC. The removal efficiencies of fenitrothion and TOC by GAC were similar. As the dosages of ZVI and GAC were increased, the removal efficiencies of fenitrothion and TOC increased. However, as the dosages of ZVI for pretreatment were increased, the adsorptions of fenitrothion on GAC were hindered.