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Song, Donghoon,Kang, Moon-Sung,Lee, Yong-Gun,Cho, Woohyung,Lee, Jung Hyun,Son, Taewook,Lee, Kyoung Jun,Nagarajan, S.,Sudhagar, P.,Yum, Jun-Ho,Kang, Yong Soo The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.2
<p>A new I<SUP>−</SUP>/(SeCN)<SUB>2</SUB> redox mediator has favorable properties for dye-sensitized solar cells (DSCs) such as less visible light absorption, higher ionic conductivity, and downward shift of redox potential than I<SUP>−</SUP>/I<SUB>3</SUB><SUP>−</SUP>. It was then applied for DSCs towards increasing energy conversion efficiency, giving a new potential for improving performance.</p> <P>Graphic Abstract</P><P>A novel I<SUP>−</SUP>/(SeCN)<SUB>2</SUB> redox mediator, for the first time, showed favourable electrochemical properties for DSCs, resulting in an increased energy conversion efficiency. <img src='http://pubs.rsc.org/ej/CP/2011/c1cp23457a/c1cp23457a-ga.gif'> </P>
Song, Donghoon,Choi, Young-Seop,Kim, Byung Su,Kim, Hoon Sik,Kang, Yong Soo Elsevier 2019 Materials letters Vol.246 No.-
<P><B>Abstract</B></P> <P>Imidazoliums are commonly used ionic liquid cations in electrolyte in dye-sensitized solar cells (DSSCs). Here, the size effects of imidazolium cations bearing the cyanoethyl group on DSSC performance have been systematically investigated by introducing the different alkyl chains (C1–C12), by which size control is allowed in a range of 9–20 Å. The large cations slow down electron recombination and ion diffusion, but, unexpectedly, they suppress downward shift of TiO<SUB>2</SUB> conduction band significantly affecting on electron injection process. While all the cations used in this work demonstrate a better power conversion efficiency than that for the common imidazolium analogue, the interplay among the key processes results in the best performance with the medium-sized cation C4 (11 Å). This work paves a way for design of efficient electrolyte cations for photovoltaic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Imidazolium ionic liquids are utilized in electrolytes in dye-sensitized solar cells. </LI> <LI> Cations in the ionic liquids are differently sized while bearing cyanoethyl group. </LI> <LI> Bulky cations exhibit slow I<SUB>3</SUB> <SUP>−</SUP> diffusion and electron recombination. </LI> <LI> But, unexpectedly, bulky cations suppress downward shift of TiO<SUB>2</SUB> conduction band. </LI> <LI> This interesting result is closely associated with function of cyanoethyl group. </LI> </UL> </P>
김동훈(Donghoon Kim),송준엽(Junyeob Song),차석근(Sukkeun Cha),최찬우(Chanwoo Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper introduces the case study on development of airbag safety sensor by supporting convenience for driver. Passenger Disable Switch(PDS) is desigend and evaluated by simulation process and operating test. And also, many related sensors were supported for performance test of PDS. The reliability of PDS was analyzed for safe operation and application in a moto vehicle.
오동훈(Donghoon Oh),정문렬(Moonryul Jung),송창근(Changgeun Song),이종완(Jongwan Lee) 한국정보과학회 2006 정보과학회 컴퓨팅의 실제 논문지 Vol.12 No.3
본 논문은 소성변형(plastic deformation)특성을 갖는 직물의 움직임을 시뮬레이션하는 기법을 제안한다. 소성은 탄성과 반대되는 개념으로, 물질이 외부의 힘에 의해 변형되었을 때, 초기상태로 완전히 회복되지못하는 성질이다. 직물은 파티클 모델(particle model)을 이용하여 모델링하며, 파티클간의 상호작용은 바로 인접한 파티클간의 순차연결과 한 파티클 건너에 있는 파티클간의 교차연결을 설정함으로써 표현한다. 순차연결은 직물의 압축과 인장변형을, 교차연결은 직물의 굽힙변형을 표현한다. 연결은 스프링으로 모델링하는데, 순차연결은 탄성스프링으로, 교차연결은 변형정도에 따라, 탄성스프링 또는 소성스프링으로 모델링한다. 본 논문은 기존의 파티클 모델에서 사용하는 탄성스프링에 소성스프링을 추가하여 직물의 소성변형현상을 표현한 것이다. 그 결과, 굽힘주름과 영구변형된 구김주름, 그리고 주름이 직물 전체에 고루 분포되는 현상을 시뮬레이션할 수 있었다. 연결의 탄성스프링과 소성스프링을 모델링할 때 직물운동방정식 수치해법의 안정성을 보장하기 위해 직물 시스템의 강성 메트릭스 (stiffness matrix)가 indefinite이 되지 않도록 주의를 기울였다. This paper presents a cloth simulation technique that implements plastic deformation. Plasticity is the property that material does not restore completely to the original state once deformed, in contrast to elasticity. We model cloth using a particle model, and posit two kinds of connections between particles, i.e. the sequential connections between immediate neighbors, and the interlaced connections between every other neighbors. The sequential connections represent the compression and tension of cloth, and the interlaced connections the bending in cloth. The sequential connections are modeled by elastic springs, and the interlaced connections by elastic or plastic spring depending on the amount of the current deformation of the connections. Our model is obtained by adding plastic springs to the existing elastic particle model of cloth. Using the new model, we have been able to simulate bending wrinkles, permanently deformed wrinkles, and small wrinkles widely distributed over cloth. When constructing elastic and plastic spring models for sequential and interlaced connections, we took pain to prevent the stiffness matrix of the whole cloth system from being indefinite, in order to help achieve physical stability of the cloth motion equation and to improve the effectiveness of the numerical method.
무선통신 기반의 항만 야드 트레일러의 컨테이너 양적하 위치 유도 장치 개발 및 특성평가
김동훈(Donghoon Kim),송준엽(Junyeob Song),차석근(Sukkeun Cha),이승호(Seungho Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we have attempted to analyze current situation and the problem of domestic and overseas harbor container delivery & cargo work automation centered around major harbors and to suggest effective way to deal with the issue in order to improve the productivity of container cargo work per crane, the major index of productivity of high value-added shipbuilding industry. In particular, we have suggested the way to realize effective automation system that can improve the efficiency of harbor container delivery & cargo work through the development of high-tech measuring automation technology using microwave radar and applied design that have broken away from traditional automation system and traditional problems such as dependence on manual work and the problem of laser method in which workers cannot identify laser beam under sunlight and workers’ eyesight can be weakened by being exposed to laser beam.
최동훈 ( Donghoon Choi ),엄정호 ( Jungho Um ),윤화묵 ( Hwa-mook Yoon ),최윤수 ( Yun-soo Choi ),이민호 ( Minho-lee ),이원구 ( Won-goo Lee ),송사광 ( Sa-kwang Song ),정한민 ( Hanmin Jung ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2
식물 염기 서열 분석은 동물에 비해 유전체가 길고 데이터 양이 많아 특별한 전략을 요구하고 있다. 본 논문은 FCLA 전략을 지원하기 위한 데이터 분석 플랫폼의 개발에 대해 서술한다.
효율적인 컨테이너 적양하를 위한 야드 트레일러 정차위치 유도장치 상용화를 위한 분석 및 연구
김동훈(Donghoon Kim),송준엽(Junyeob Song),이승호(Seungho Lee),강일용(Il-Young Kang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In this paper, we have attempted to analyze current situation and the problem of domestic and overseas harbor container delivery & cargo work automation centered around major harbors and to suggest effective way to deal with the issue in order to improve the productivity of container cargo work per crane, the major index of productivity of high value-added shipbuilding industry. In particular, we have suggested the way to realize effective automation system that can improve the efficiency of harbor container delivery & cargo work through the development of high-tech measuring automation technology using microwave radar and applied design that have broken away from traditional automation system and traditional problems such as dependence on manual work and the problem of laser method in which workers cannot identify laser beam under sunlight and workers" eyesight can be weakened by being exposed to laser beam.
2-Tier 클러스터링을 이용한 Hidden Rule 검색
한동훈(DongHoon Han),황준원(JunWon Hwang),송두헌(Doo Heon Song),이창훈(ChangHoon Lee) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.1
e-CRM에서 온라인 데이터를 분석하여 유용한 고객그룹을 파악하고 행동패턴을 파악하기 위해 데이터마이닝 기법이 사용되고 있다. 그러나 고객 데이터와 웹 문서 데이터의 연관관계를 고려하지 않고 독립적으로 사용함으로써 부족한 정보로 인해 생성된 정보량이 부족하고 선뢰성이 떨어진다. 본 논문에서는 e-CRM 분야의 상이한 두 데이터 계층에 다양한 클러스터링 알고리즘을 이용하여 2-Tier 클러스터링 기법을 적용하고 잠재된 고객의 행동양식을 파악하기 위한 방법을 제시하였다.