Polymer Gate Insulators에 따른 Pentacene Organic Thin-Film Transistors의 특성 분석

김정민(Jung-Min Kim),허현정(Hyun-Jung Her),윤정흠(J.H. Yoon),김재완(Jaewan Kim),최영진(Y. S. Choi),강치중(C. J. Kang),전동렬(D. Jeon),김용상(Yong-Sang Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

본 연구에서는 polymer gate insulators에 따른 pentacene 유기 박막 트랜지스터 (Organic Thin-Film Transistors)의 전기적 특성을 atom force microscope (AFM), x-ray diffraction (XRD) 그리고 I-V 측정을 이용하여 분석하였다. Pentacene 박막 트랜지스터의 전기적 특성은 pentacene의 증착 조건뿐만 아니라 polymer gate insulator에 따라 크게 영향을 받는다. 따라서 다양한 polymer 기판 위에 온도, 두께 그리고 증착 속도에 따라 Pentacene을 증착 하였다. 그리고 증착된 pentacne을 AFM, XRD를 이용하여 pentacene의 구조, 결정화 그리고 grain 크기 등을 분석하였다. 또한 inverted staggered 구조의 pentacne 박막 트랜지스터 소자를 제작하고 I-V 측정하여 그 결과를 분석하였다.

나노기공 알루미나 주형을 이용한 TiO₂ N-type 반도체 계면에 관한 연구

허현정(Hyun-Jung Her),김정민(Jung-Min Kim),박성확(Sunghwak Park),최영진(Y. J. Choi),김재완(Jaewan Kim),강치중(C. J. Kang),김한수(Han-Soo Kim),김용상(Yong-Sang Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

본 논문에서는 두께 0.25㎜의 알루미늄 포일 (foil)을 이용해 나노기공 알루미나 주형을 만들었다. 우선 알루미늄 포일 표면의 유기물을 제거한 후, 전해연마 방법을 이용하여 표면을 매끄럽게 하였다. 또, 양극산화를 통해 알루미늄 표면에 나노기공을 형성 하였다. 나노기공 알루미나(Al₂O₃) 주형 위에 Polymethyl methacrylate (PMMA)를 얇게 도포하여 나노기공 사이로 침투시킨 후 주형을 제거 하여 나노기둥인 PMMA를 얻었다. 이것을 나노임프린트 리소그라피 기법을 이용하여 태양전지의 N-type 물질로 많이 사용되는 티타니아 (TiO₂)의 면적을 넓게 할 수 있다.

Ordered Double Perovskite Sr₂FeRuO₆ Grown by Alternating Deposition of SrRuO₃ and SrFeO₃

Jaewan Chang,Kyujoon Lee,Myung Hwa Jung,Ji-Hwan Kwon,Miyoung Kim,Sang-Koog Kim 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

공기업 조직문화의 실증분석 : 집단성-격자성의 문화이론을 중심으로

정동재,박재완 한국행정연구원 2002 韓國行政硏究 Vol.11 No.4

조직문화가 구성원의 ‘문화적 편향’과 ‘사회적 관계’에 의해 결정된다고 보는 ‘문화이론’의 틀에 따라 ‘집단성’과 ‘격자성’을 기준으로 문화를 유형화하고 이를 중심으로, 한국 공기업의 조직문화를 실증적으로 고찰하고 그 시사점을 도출하였다. 공기업은 공공성과 기업성의 복합적인 임무를 수행하므로, 정부지분율과 설립목적 및 임무의 성격을 기준으로 정부기업, 정부투자기관(진흥형, 개발형, 중간형) 및 정부출자기관으로 나누어 각 유형별로 1개씩 5개 공기업을 선정하고, 이들 기관에 근무하는 직원을 대상으로 설문조사를 실시한 뒤, 그 결과를 요인분석 및 분산분석기법에 의해 분석하였다. 분석 결과 같은 공기업 내에도 다양한 하위문화가 존재하며, 구성원들이 처한 사회적 맥락에 따라 문화적 편향이 변화할 개연성을 확인하였다. 이는 조직문화를 정태적인 시각에서 접근하는 경향에 대한 수정이 필요함을 시사한다. 선행연구를 기초로 설정한 ‘정부지분율’과 ‘설립목적 및 임무의 성격’이라는 기준에 따라 조직문화의 4가지 유형이 일정한 패턴을 보일 것이라는 기대는 충족하지 못했으나, 공기업별로 문화적 편향이 상당히 차이가 나며, 경영기조가 성과와 고객만족을 중시하는 방향으로 전환함에 따라 점차 저격자성-저집단성의 개인주의 문화를 지향할 가능성을 엿볼 수 있었다. The purposes of this study are i) to confirm the relevance of Doll and Torkzadeh's measurement instrument of user satisfaction, ii) to examine user satisfaction of the public sector information system, and iii) to investigate factors affecting user satisfaction of the public sector information system. The study executed the survey of 300 officials from 15 departments in Air-Force H.Q. in Semptember, 2001. For dependent variables, the survey included Doll and Torkzadeh's 12 items measuring user satisfaction of Air-Force Information Systems. For independent variables, the survey used 5 items indicating CEO support, 5 items representing IT support, and 10 items explaining demographical characteristics. For analysis, this study employed factor analyses and LISREL. The result show that officials had higher user satisfaction with the Air-Force Information System and CEO support was much more important in determining officials' user satisfaction than IT support and demographical characteristics. In this paper, we empirically analyze the organizational culture of five Korean public enterprises based on the criteria of 'group and grid' in accordance with the framework of the so-called 'culture theory' which considers an organizational culture as being determined by 'cultural bias ' and 'social relations, ' and derive some implications toward ongoing reform efforts in Korea's public sector. As public enterprises carry out dual missions of enhancing public accountability and pursuing profitability simultaneously, we categorize them into five groups by the character of their missions and the ratio of government ownership. We select one enterprise for each group and conduct a survey on 60 employees for each enterprise. Survey results are analyzed through a factor analysis and an ANOVA. Key findings are as follows: (i) Diverse sub-cultures exist even within an identical public enterprise; (ii) A seemingly concrete cultural bias may be affected in response to changing circumstances; (iii) A hypothesis that organizational culture of public enterprises vary depending on the character of their missions and the ratio of government ownership is not proven. Nevertheless, cultural biases are considerably different from each other and the recent drive of performance-oriented and customer-friendly restructuring is likely to transform the existing hierarchical and bureaucratic culture into an individualistic one with a low-group and low-grid property. The findings suggest a modification to the current uni-dimensional approach to study organizational culture. Public personnel administration has been subjected to virtually uninterrupted wave of reforms under the legacy of New Public Management. It has been the key area of governmental reforms during the past two decades. Many efforts were made to initiate structural changes also in Korea. However. since the feature of traditional class system prevails in the human resource management of the Korean government, it is difficult to achieve the utmost cfficiency. This paper examines major issues of public personnel administration in Korea, particularly form the viewpoint of CDRCareer Development Program). The purpose of this paper is threefold. First, the notion of CDP is introduced to the field of public personnel administration research. Second, the current problems of personnel administration in Korea are analysed from the views of Career Development Program. Third, policy alternatives are developed for the improvement of job competency of public officials in Korea. To accomplish these objectives, this research adopts questionnaire survey method and Brain Storming approach in part. Seven policy alternatives are presented in this study. In order to successfully achieve the unification of South and North Korea, it is necessary to carry out a systematic study as to how the political and administrative systems of North Korea could be transformed into a democratic system. Such a transformation implies the fundamental reconstruction of a nation, accompanied by drastic changes in political and administrative systems. In the case of the former East Germany, the nations statehood itself changed as a result of German unification. Regardless of the method, if the product of Korean unification were a democratic, constitutional, free-market economy and a welfare society, North Korea would inevitably undergo a transformation of its state system. In particular, the transformation of human

Emergence of Room-Temperature Magnetic Ordering in Artificially Fabricated Ordered-Double-Perovskite Sr₂FeRuO₆

Chang, Jaewan,Lee, Kyujoon,Jung, Myung Hwa,Kwon, Ji-Hwan,Kim, Miyoung,Kim, Sang-Koog American Chemical Society 2011 Chemistry of materials Vol.23 No.11

<P>Ordered double perovskite Sr<SUB>2</SUB>FeRuO<SUB>6</SUB> thin films were artificially fabricated by alternating growths of SrRuO<SUB>3</SUB> and SrFeO<SUB>3</SUB> unit atomic layers on atomically flat Ti<SUP>4+</SUP>-terminated SrTiO<SUB>3</SUB> (111) substrates, thereby realizing ferromagnetism (or ferrimagnetism) of 390 K magnetic transition temperature (<I>T</I><SUB>C</SUB>), which is nonexistent in disordered double perovskite Sr<SUB>2</SUB>FeRuO<SUB>6</SUB>, known as spin glass.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2011/cmatex.2011.23.issue-11/cm200454z/production/images/medium/cm-2011-00454z_0002.gif'></P>

서울지역 미세먼지 문제 개선을 위한 사회문화적 지불의사액 추정

김재완 ( Jaewan Kim ),정태용 ( Taeyong Jung ),이태동 ( Taedong Lee ),이동근 ( Dong Kun Lee ) 한국환경영향평가학회 2019 환경영향평가 Vol.28 No.2

서울 및 수도권 지역의 미세먼지 문제는 지역 주민의 건강, 생태계 및 산업활동에 다양한 영향을 미치며 최근 가장 심각한 환경문제의 하나로 대두되고 있다. 정부와 개인은 미세먼지 문제에 대응하기 위해 다양한 비용을 지불하고 있다. 따라서, 본 연구는 동지역에 거주하고 있는 사회문화적 특성이 다른 두 집단(서울 및 수도권 지역의 외국인학교와 일반학교)의 학부모들을 대상으로 미세먼지 문제 해결을 위한 두 집단 간의 지불의사액이 어떻게 다른지를 추정하고자 한다. 응답자들의 지불의사액을 도출하기 위해 단일양분선택형(single-bounded dichotomous choice) 질문기법을 이용한 조건부가치추정법(contingent valuation model: CVM)을 사용하였다. 토빗과 프로빗모형을 이용한 지불의사액 추정 결과, 서울 및 수도권지역에 거주하는 전체 학부모들은 지역 내 미세먼지 문제 개선을 위한 청정 전기(green electricity) 사용료를 가구당 월평균 3,993원 가량 더 지불할 의사가 있는 것으로 추정되었다. 두 집단 간의 지불의사액 비교 시 비내국인 그룹(international group)은 월 3,325원, 내국인 그룹(domestic group)은 월 4,449원으로 다소 큰 차이를 보였는데, 이는 각 집단이 속한 사회문화적 배경의 차이에 따라 사회경제적 지위, 개인적 경험, 정부정책에 대한 신뢰 및 가치관 등이 개인의 지불의사를 결정하는데 다르게 작용한 것으로 보인다. 본 연구의 결과, 현재 수도권지역의 미세먼지 문제 해결을 위해서는 무엇보다 시민들이 미세먼지 문제를 청정 에너지 사용과 연결 지어 생각할 수 있도록 환경의식을 고취하는 것이 필요하며, 특히 사회문화적 배경이 다른 계층에 대한 정부 오염 저감 정책의 신뢰도 향상에 초점을 맞출 필요가 있다. Over the last few years, air pollution (PM₁₀, PM_2.5) in the Seoul metropolitan area (SMA) has emerged as one of the most concerned and threatening environmental issues among the residents. It brings about various harmful effects on human health, as well as ecosystem and industrial activities. Governments and individuals pay various costs to mitigate the level of air pollutants. This study aims to empirically find the willingness to pays (WTP) among the parents from different socio-cultural groups - international and domestic groups to mitigate air pollution (PM₁₀, PM_2.5) in their residential area. Contingent Valuation Methods (CVM) is used with employing single-bounded dichotomous choice technique to elicit the respondent’s WTP. Using tobit (censored regression) and probit models, the monthly mean WTP of the pooled sample for green electricity which contributes to improve air quality in the region was estimated as 3,993 KRW (3.58 USD). However, the mean WTP between the international group and domestic group through a sub-sample analysis shows broad distinction as 3,325KRW (2.98 USD) and 4,449 KRW (3.98 USD) respectively. This is because that socio-cultural characteristics of each group such as socio-economic status, personal experience, trust in institutions and worldview are differently associated with the WTP. Based on the results, the society needs to raise awareness of lay people to find a strong linkage between the current PM issue and green electricity. Also, it needs to improve trust in the government’s pollution abatement policy to mobilize more assertive participation of the people from different socio-cultural background.

퍼지-이동슬라이딩모드 제어기를 이용한 ER 현가장치의 제어

조재완(Jaewan Cho),최승복(Seungbok Choi),정시영(Siyoung Jung) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2

This paper presents a robust and superior control performance of a quarter-vehicle electrorheological (ER) suspension system. In order to achieve this goal, a moving sliding mode control algorithm is adopted, and its moving strategy is tuned by fuzzy logic. As a first step, ER shock absorber is designed and manufactured for a commercial suspension system, and its field-dependent damping force is experimentally evaluated. After formulating the governing equation of motion for the quarter-vehicle ER suspension system, a stable sliding surface and moving algorithm based on fuzzy logic are formulated. The sliding mode controller is then synthesized and control performance such as vertical displacement is evaluated in time domain.

자기 포화를 고려한 센서리스 제어용 IPMSM 설계

최재완(JaeWan Choi),설현수(Hyun-Soo Seol),정동훈(Dong-Hoon Jung),박예지(YeJi Park),이주(Ju Lee) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.7

Brush-Shaped ZnO Heteronanorods Synthesized Using Thermal-Assisted Pulsed Laser Deposition

Choi, Jaewan,Ji, Hyunjin,Tambunan, Octolia Togibasa,Hwang, In-Sung,Woo, Hyung-Sik,Lee, Jong-Heun,Lee, Bo Wha,Liu, Chunli,Rhee, Seuk Joo,Jung, Chang Uk,Kim, Gyu-Tae American Chemical Society 2011 ACS APPLIED MATERIALS & INTERFACES Vol.3 No.12

<P>Brush-shaped ZnO heteronanostructures were synthesized using a newly designed thermal-assisted pulsed laser deposition (T-PLD) system that combines the advantages of pulsed laser deposition (PLD) and a hot furnace system. Branched ZnO nanostructures were successfully grown onto CVD-grown backbone nanowires by T-PLD. Although ZnO growth at 300 °C resulted in core–shell structures, brush-shaped hierarchical nanostructures were formed at 500–600 °C. Materials properties were studied via photoluminescence (PL), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations. The enhanced photocurrent of a SnO<SUB>2</SUB>–ZnO heterostructures device by irradiation with 365 nm wavelength ultraviolet (UV) light was also investigated by the current–voltage characteristics.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2011/aamick.2011.3.issue-12/am201106v/production/images/medium/am-2011-01106v_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am201106v'>ACS Electronic Supporting Info</A></P>

Electrical and mechanical property of ZnO wire using catalyst-free chemical vapor deposition

Lee Jinkyung,Jung Unseok,Kim Hakseong,Yun Hoyeol,Seo Miri,Jonathan Ho,MiriChoi Jaewan,Kim Gyutae,Lee Sangwook 한국진공학회 2011 한국진공학회 학술발표회초록집 Vol.40 No.0