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Lee, Ki-Heon,Lee, Jeong-Hoon,Kang, Hee-Don,Park, Byoungnam,Kwon, Yongwoo,Ko, Heejoo,Lee, Changho,Lee, Jonghyuk,Yang, Heesun American Chemical Society 2014 ACS NANO Vol.8 No.5
<P>Green CdSe@ZnS quantum dots (QDs) of 9.5 nm size with a composition gradient shell are first prepared by a single-step synthetic approach, and then 12.7 nm CdSe@ZnS/ZnS QDs, the largest among ZnS-shelled visible-emitting QDs available to date, are obtained through the overcoating of an additional 1.6 nm thick ZnS shell. Two QDs of CdSe@ZnS and CdSe@ZnS/ZnS are incorporated into the solution-processed hybrid QD-based light-emitting diode (QLED) structure, where the QD emissive layer (EML) is sandwiched by poly(9-vinlycarbazole) and ZnO nanoparticles as hole and electron-transport layers, respectively. We find that the presence of an additional ZnS shell makes a profound impact on device performances such as luminance and efficiencies. Compared to CdSe@ZnS QD-based devices the efficiencies of CdSe@ZnS/ZnS QD-based devices are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 46.4 cd/A and external quantum efficiency of 12.6%. Such excellent results are likely attributable to a unique structure in CdSe@ZnS/ZnS QDs with a relatively thick ZnS outer shell as well as a well-positioned intermediate alloyed shell, enabling the effective suppression of nonradiative energy transfer between closely packed EML QDs and Auger recombination at charged QDs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-5/nn500852g/production/images/medium/nn-2014-00852g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500852g'>ACS Electronic Supporting Info</A></P>
시맨틱 웹을 이용한 UML 기반의 웹 서비스 애플리케이션의 진화
이창호(Changho Lee),김진한(Jinhan Kim),이재정(Jaejeong Lee),이병정(Byungjeong Lee) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2B
시장 적시성과 서비스의 품질을 만족하기 위해 웹 서비스는 서비스를 재사용하여 애플리케이션을 구성한다. 그리고 동적 진화(evolution)는 소프트웨어에 유연성을 제공하고, 계속 변경되어 예측하기 어려운 비즈니스 요구사항에 애플리케이션이 적응할 수 있도록 해준다. OWL 기반의 OWL-S(Web Ontology Language for Services)는 서비스를 기술하기 위한 온톨로지 언어이다. OWL-S의 의미적인 정보는 자동화된 시맨틱 웹 서비스의 발견과 호출, 서비스 조합을 위해 사용될 수 있다. 본 논문에서는 이러한 시맨틱 웹 서비스를 이용한 웹 애플리케이션의 동적 진화를 지원하는 프레임워크를 제안한다. 그리고 프로토타입을 통해 제안한 프레임워크의 타당성을 보인다.
스마트무인기 연료시스템 연료이송 제트펌프의 성능평가에 관한 실험적 연구
이윤권(Yoonkwon Lee),김의수(Euisoo Kim),박설혜(Sulhye Park),이지근(Jeekeun Lee),이창호(Changho Lee),이수철(Soochul Lee),최희주(Heejoo Choi) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.12
스마트무인기 연료공급시스템에 사용되는 제트펌프의 연료탱크 사이의 연료이송 특성이 실험적으로 조사되었다. 제트펌프의 작동조건은 비행체의 임무에 따른 엔진의 요구사항을 만족하도록 설정되었으며, 주어진 조건에서 제트펌프의 성능을 평가하였다. 제트펌프의 유량비 변화에 따른 압력비 및 효율이 측정되었으며 면적비 변화 등이 고려되었다. 평가 결과로부터 제트펌프는 주어진 압력비보다 큰 범위에서 작동목표인 유량비 2.23을 만족하였다. 효율보다 연료공급량이 중시되는 연료이송 제트펌프의 경우 면적비 변화를 통하여 허용 압력비 범위 내에서 유량비 조절이 가능함을 알 수 있었다. The fuel transfer characteristics of the jet pump between fuel tanks, which is applied in the smart UAV fuel supply system, were experimentally investigated. The operating conditions of the jet pump were setup to meet the engine requirement according to mission profile, and the jet pump performance was evaluated at those conditions. The pressure ratio and the efficiency of the jet pump were measured with the variation of flow ratio. In addition, the area ratio was taken into the consideration to examine the effect on the jet pump performance. From the evaluation results, the jet pump met the fundamental requirement to transfer fuel with the flow ratio of 2.23. In the case of the jet pump that is focused on the fuel transfer quantity rather than its efficiency, the flow ratio would be adjusted through the variation of area ratio of the jet pump within the permitted limit of pressure ratio.
이일권(ILkwon Lee),국창호(Changho Kook),이정호(JeongHo Lee),함성훈(SungHoon Ham),이영숙(YoungSuk Lee),이승용(Seung Yong Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
This paper is to study and analyze the change factor including with combustion engine to electric car. In recent, the fossil fuel that a great part of the energy source existence in the earth was brought on the global warming phenomenon endangering the survial of mankind. It was been at the end of one’s rope that a mankind had to change with the electric car for decreasing a CO2 from the emission gas in the vehicle. But for changing a electric car, the every nations in the world must devicefully resolve the reduced work problem and the derivation problem causing with decline of the petroleum consumption. Resulting do a survey for purchase reason of a electric car, the cost of fuel was investigated in the highest ratio of 56.5% in the survey. This is the most important factor for economical aspect like fuel expense reduction. To increase the electric car, the charge expense will be maintained with low price continuously. In the questionnaire survey analysis for the supply expansion of electric car, a charging station secure was investigated in the highest ratio of 44.7% in the survey. This can forecast to think more important the practical convience than the electric vehicle price and environmentfriendly awareness. The prospect of electric vehicle marcket is predicted that the car makers to live in heavy competition must quickly read the market situation and sales strategy in the world because of discrepancy reduction of technical between the conventional and new car makers.
스마트 무인기 연료계통 제트펌프 설계 및 성능예측에 관한 연구
이윤권(Yoonkwon Lee),박설혜(Sulhye Park),이지근(Jeekeun Lee),이창호(Changho Lee),최희주(Heeju Choi),이수철(Soochul Lee),정재헌(Jeahun Jeong) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This paper is concerned with the design and performance prediction of jet pumps for fuel system. The jet pump is important component to transfer the fuel between tanks in fuel supply system. However detailed design procedures for sizing the component of the jet pumps are known a little. In this paper the jet pump was designed according to the design procedure based on the theoretical analysis. For verifying the design results from the theoretical approach, the performance of the designed jet pump was predicted using a commercial analysis code and was verified through the experiment for the jet pump sizing with high performance. The flow ratio and pressure ratio were compared with target value and satisfied the demands in fuel supply system. Further research was carried out to obtain more conclusive information from various interference conditions and for improvement in performance.
Lee, Changho,Kim, Kyungun,Han, Seunghoon,Kim, Sehui,Lee, Jun Hoon,Kim, Hong Kyun,Kim, Chulhong,Jung, Woonggyu,Kim, Jeehyun SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS 2014 JOURNAL OF BIOMEDICAL OPTICS Vol.19 No.3
<P>An intraoperative surgical microscope is an essential tool in a neuro- or ophthalmological surgical environment. Yet, it has an inherent limitation to classify subsurface information because it only provides the surface images. To compensate for and assist in this problem, combining the surgical microscope with optical coherence tomography (OCT) has been adapted. We developed a real-time virtual intraoperative surgical OCT (VISOCT) system by adapting a spectral-domain OCT scanner with a commercial surgical microscope. Thanks to our custom-made beam splitting and image display subsystems, the OCT images and microscopic images are simultaneously visualized through an ocular lens or the eyepiece of the microscope. This improvement helps surgeons to focus on the operation without distraction to view OCT images on another separate display. Moreover, displaying the OCT live images on the eyepiece helps surgeon's depth perception during the surgeries. Finally, we successfully processed stimulated penetrating keratoplasty in live rabbits. We believe that these technical achievements are crucial to enhance the usability of the VISOCT system in a real surgical operating condition.</P>