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$\AA$.

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.

SAW 필터용 ZnO 압전 박막의 전기적 특성

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.

공구 중심점의 변위 최소화를 위한 문형 공작기계의 크로스레일 개선 연구

이동윤(Dong-Yoon Lee),이명규(Myung-Gyu Lee),이종훈(Jong-Hoon Lee),최학봉(Hag-Bong Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4

General portal machine represents a distinct weak spot concerning their structural behavior because of long protruding structure components, such as saddle & ram. TCP was chosen as a reference point for evaluating the contortion effect of Crossrail. The structural analysis of two cases were performed and the displacement of the TCP were compared. The purpose of this study is to minimize contortion through design improvement of crossrail.

지방선거와 정당공천제 논쟁

이동윤(Lee Dong-Yoon) 서강대학교 현대정치연구소 2010 현대정치연구 Vol.3 No.1

탄성표면파 소자의 모델링에 따른 특성 분석

이동윤(Lee dong-yoon) 한국콘텐츠학회 2010 한국콘텐츠학회 종합학술대회 논문집 Vol.2010 No.5

한국 정당연구의 비판적 검토

이동윤(Dong-Yoon Lee) 한국정당학회 2010 한국정당학회보 Vol.9 No.1

이 논문은 한국의 정당연구를 통해 표출된 정당조직 차원의 주요 논쟁들을 비판적 시각에서 재검토하고, 정당연구의 발전을 위한 새로운 연구 방향을 모색하는 데 주요 목적이 있다. 한국의 정당연구는 1987년 민주화와 더불어 정치발전을 위한 정당정치의 중요성이 강조되면서 서구 민주국가들의 정치발전과 정당정치에 관한 개념적 인식 및 이론적 모델의 적용을 통해 다양한 논의들이 활성화되었다. 그러나 한국의 정당연구는 정당조직 차원에서 아직도 정당정치의 위기를 상정한 정당 유형의 변화나 정당정치의 제도화 문제를 둘러싼 다양한 논쟁과 문제점들이 지적되고 있다. 결과적으로 한국 정당연구의 건설적 발전을 위해서는 정당연구의 한국적 정체성이 확립되고, 정당의 본원적 기능과 역할에 충실한 심층적 연구가 진행되어야 하며, 그동안 선거연구나 정책연구에 경도되었던 정당연구의 확충이 필요하고, 한국과 제3세계 후발민주국가들의 정당정치에 대한 비교연구가 활성화되어야 할 것이다. The purpose of this study is to review the polemic arguments on party organization, which were recently revealed through the party studies in Korea, and to explore the ways toward new research direction for development of party studies. Since the 1987 democratization, party studies in Korea was vitalized for political development and democratic reform, which is centering around the conceptual application and diverse theories of party politics in Western democracies. However, in the dimension of party organization, Korea’s party studies is pointed out of various critics and problems around the change of party organization type and institutionalization of party politics in confront with crisis of party politics. Conclusionally, for the constructive development of party studies in Korea, there need to establish Korean identity of party studies, to perform the deepening research be faithful to fundamental functions and roles of political party, to expand the research subject and scope of party studies which was biased toward policy and electoral studies, and to vitalize comparative studies on party politics of Korea and the third world’s new democracies.

La₂O₃가 첨가된 Pd/TiO₂ 촉매의 개발 및 H₂ 상온산화 반응에서의 성능 향상 연구

이동윤 ( Dong Yoon Lee ),김성철 ( Sung Chul Kim ),이상문 ( Sang Moon Lee ),김성수 ( Sung Su Kim ) 한국공업화학회 2020 공업화학 Vol.31 No.6

본 연구에서는 상온 조건에서 추가적인 에너지원 없이 H₂ 산화가 가능한 Pd/TiO₂ 촉매를 제조하였고, 지지체인 TiO₂의 비표면적은 Pd/TiO₂ 촉매의 H₂ 산화 반응 성능과 비례하지는 않은 것을 확인하였다. 또한 촉매의 물성 변화에 의한 성능 영향 평가를 위하여 La₂O₃를 Pd/TiO₂ 촉매에 첨가하였다. La₂O₃를 TiO₂에 함량별로 첨가하여 Pd/La₂O₃-TiO₂를 제조하였고, CO chemisorption 분석을 진행하였다. Pd/TiO₂ (G) 촉매의 전환율(14% at 0.5% H₂)과 비교하여 Pd/La₂O₃-TiO₂ 촉매가 74% 전환율로 5배 이상의 성능 증진이 나타났다. Pd/La₂O₃-TiO₂ 촉매는 활성금속인 Pd의 metal dispersion이 클수록 H₂ 산화반응에 유리한 것으로 분석되었다. 하지만 첨가되는 La2O3가 10%를 초과하게 되면 촉매 성능이 다시 감소하는 것을 알 수 있었다. 마지막으로 Pd/La₂O₃-TiO₂ 촉매의 물성이 지배적인 영향을 미치는 것은 주입되는 H₂가 0.3~0.5% 농도 조건까지이며, 1% 이상의 H₂ 농도부터는 물질전달이 촉매 반응속도를 지배하는 것으로 판단된다. In this study, a Pd/TiO₂ catalyst which oxidized H₂ at room temperature without an additional energy source was prepared. And a specific surface area of TiO₂ as a support was not proportional to H₂ oxidation reaction performance of Pd/TiO₂ catalyst. In addition La₂O₃ was added to Pd/TiO₂ catalyst in order to evaluate the performance effect due to the change of catalysts physical properties. A Pd/La₂O₃-TiO₂ was prepared by adding different amounts of La₂O₃ to TiO₂ and CO chemisorption analysis was performed. Compared to the conversion rate (14% at 0.5% H₂) of the Pd/TiO₂ (G) catalyst, the Pd/La₂O₃-TiO₂ catalyst showed 74% which was improved by more than five times. It was found that the larger the metal dispersion of Pd as an active metal is, the more favorable to H₂ oxidation reaction is. However, when the added La₂O₃ amount exceeded 10%, the catalyst performance decreased again. Finally, it was concluded that the physical properties of the Pd/La₂O₃-TiO₂ catalyst have a dominant influence on the catalytic activity until 0.3~0.5% of injected H₂ concentrations and the catalyst reaction rate was controlled by substance transfer from 1% or more concentrations of H₂.

정당의 후보선출제도와 정당정치의 문제점

이동윤(Dong-Yoon Lee) 한국정당학회 2008 한국정당학회보 Vol.7 No.1

본 연구는 제17대 대통령선거에서 주요 정당들이 시행한 대통령후보 선출제도의 운영과 진행 과정을 살펴보고, 제반 문제점을 점검하는 데 주요 목적이 있다. 이를 위해 본 연구는 제17대 대통령선거의 주요 정당별 후보경선과정을 그 제도적 내용과 진행과정, 그리고 경선결과를 통해 포괄적으로 살펴보고, 이것이 한국의 정당정치 발전에 지니는 정치적 함의를 고찰하였다. 연구 결과, 제17대 대통령선거에 참여한 주요 정당들은 당원투표를 통해 후보 경선을 실시한 민주노동당을 제외하고 한나라당과 대통합민주신당, 민주당 모두 일반 국민들이 경선투표에 참여할 수 있는 개방형 예비선거제도를 도입하여 후보경선을 진행하였으며, 그 과정에서 다양한 문제점들이 유발되었다. 제도적 배경이나 운영원리를 충분하게 고려하지 못한 채 단순히 국민적 지지와 정치적 흥행을 목적으로 도입된 개방형 예비선거 방식의 후보선출제도는 각 정당별로 당내 충분한 합의나 세부규칙의 준비 없이 후보경선이 치러짐으로써 경선후보들 사이의 세부규칙을 둘러싼 잡음과 과열경쟁, 경선 중단과 파행을 유발하였으며, 국민적 관심과 경선 참여율도 저조하여 정당의 당내 민주화나 정치발전이 아닌 정당정치의 약화를 초래하였다. The purpose of this study is to review the candidate selection systems of main political parties, and to examine the problems of the candidate selection process of each political party in the 17th presidential election. For this purpose, this study observed candidate selection methods, processes, and selection results of each political party in the 17th presidential election, and explored the political implications of candidate selection system for the development of party politics in Korea. As the research shows, except for Democratic Labor Party, which elected its presidential candidate by voting of party members, other main parties elected presidential candidates through the open primary system that ordinary citizens can participate in candidate election voting. But, the open primary systemgave rise to various problems. Immature environments for this system, lackof uniform rules of the process, and disagreements on procedural issues in dispute caused confusion, overheated vying, intense conflict among candidates of each party, and boycott or discontinuance of candidate selection process which targeted only on promoting electoral supports. For these reasons, ordinary citizensshowed indifference to the process and their participation was very low. Accordingly, this research concludes that the open primary system weakened party politics in Korea rather than strengthened or developed.