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친환경농업 - 농업의 블루칩$\cdots$ -녹색농자재를 활용한 약용작물 유기재배
이수환,Lee, Su-Hwan 전국농업기술자협회 2011 농업기술회보 Vol.48 No.5
요즘 국내 농산물 산업에서의 화두는 안전성과 기능성이 결합된 친환경농산물 생산에 맞춰져 있다. 이와 함께 농업과학기술 분야에서는 내실 있는 친환경농업을 실천하기 위해 재배기술 및 화학농자재를 대체할 소재개발 연구가 활발히 진행되고 있다.
선량 중첩을 이용한 멀티형 연 X-선 정전기 제거장치의 개발
이수환,이동훈,Lee, Su Hwan,Lee, Dong Hoon 한국안전학회 2018 한국안전학회지 Vol.33 No.2
In display and semi-conductor manufacturing process, there are numerous unstable factors such as particle concentration, minimal vibration, changes in magnetic field, or electrostatic that becomes an issue to be managed and controlled. In the recent, X-ray ionization is widely used that is neutralized by separating air or gas molecules in the area where the static must be resolved. The mono-type of X-ray ionizer was not capable to be used in $8^{th}$ generation panels manufacturing plant due to its insufficient ionizing coverage since the panel itself is approximately in $2m{\times}3m$. To resolve the current problem, the development of new type called, "Multi-type X-ray ionizer" has resulted in covering enough ionizing space in $8^{th}$ generation panels industry. Comparing mono and multi types with MCNPX code simulation, the multi one indicates more X-ray flux, efficiency, and ionization performance in comparison with either a mono-type or multi-type in array format. In addition, the ionizing efficiency of overlapping area with multi-type showed 30% higher effectiveness rate as to the ordinary mono-type.
각막절편 두께 측정법의 비교: 초음파 각막두께측정계의 차감법, 직접측정법과 빛간섭단층촬영계
이수환,이주은,김재용,김명준,차흥원,Su Hwan Lee,Joo Eun Lee,Jae Yong Kim,Myung Joon Kim,Hung Won Tchah 대한안과학회 2011 대한안과학회지 Vol.52 No.5
Purpose: To compare the flap thicknesses measured with the ultrasound (US) subtraction method, the direct method, and optical coherence tomography (OCT) in femtosecond laser-assisted LASIK eyes. Methods: The present study included 65 eyes of 37 patients who underwent femtosecond laser-assisted LASIK surgery. Flap thickness was measured intraoperatively using the direct and subtraction methods with US pachymetry and postoperatively using anterior segment OCT. Flap thickness measurements were compared among the three methods. Results: There was no significant difference between the flap thickness measured using the US subtraction method and OCT (p = 0.511). The flap thickness values obtained by these two different methods also correlated well with each other (γ = 0.820, p < 0.001). However, flap thickness measured using the US direct method was significantly different (p < 0.001) with a low agreement value compared to the other two methods. Furthermore, the US direct method showed a lower measurement success rate compared to the US subtraction method (54% vs. 95%). Conclusions: Flap thickness measured using the US subtraction method and OCT showed different values compared to that measured using the US direct method. Because of the lower measurement success rate and agreement value, the US direct method is not capable of being used in substitute for the US subtraction method. J Korean Ophthalmol Soc 2011;52(5):524-530
Al:Au 음극층을 이용한 양면발광(dual emission) 유기 EL 소자의 Al 두께별 특성 평가
이수환,김달호,양희두,김지헌,이곤섭,박재근,Lee, Su-Hwan,Kim, Dal-Ho,Yang, Hee-Doo,Kim, Ji-Heon,Lee, Gon-Sub,Park, Jea-Gun 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.1
The Al:Au double-layer metal electrode for use in transparent, dual emission of organic light-emitting diode (OLED) was fabricated. The electrode of Al:Au metals with various thicknesses was deposited by the vacuum thermal evaporation technique. For Al thickness of 1 nm, a bottom luminance of $4880\;cd/m^2$ was observed at 8 V. Otherwise, top luminance of $2020\;cd/m^2$ were observed at 8 V. In addition, the threshold voltages of the electrodes were 2.2 V. It was forward that the inserting 1 nm Al between LiF and Au enhanced electron injection with tunneling effect.
OpenFlow기반 무선 메쉬 네트워크 환경에서 Flow별 라우팅을 통한 성능 향상 기법
이수환(Su-hwan Lee),정상화(Sang-Hwa Chung) 한국정보과학회 2013 정보과학회논문지 : 정보통신 Vol.40 No.4
무선 메쉬 네트워크 환경에서는 트래픽 특성에 따라 무선 링크 활용성의 제약이나 병목 현상이 발생할 수 있으며, 이는 네트워크 전체적인 성능의 저하를 야기한다. 또한 무선 인프라 네트워크로써 다양한 서비스에 대응하기 위한 유연한 라우팅 알고리즘을 필요로 한다. 본 논문에서는 기존 무선 메쉬 네트워크의 문제점 및 요구사항에 효과적으로 대응할 수 있는 OpenFlow 기반 flow별 라우팅 기법을 제안한다. 이 라우팅 기법은 기존 무선 메쉬 네트워크 표준의 airtime과 가용 대역폭을 함께 고려하며 트래픽을 Flow별로 분류하여 라우팅하기 때문에 전체 링크의 활용도를 높이고 병목 현상을 해결할 수 있다. 그리고 OpenFlow를 무선 메쉬 네트워크에 적용하기 위한 방법을 제시하여 네트워크 유지 보수 시 유연성을 확보할 수 있도록 하였다. 본 논문에서는 제안한 라우팅 기법의 검증을 위해 실험을 통하여 무선 메쉬 네트워크의 기존 라우팅 기법과 OpenFlow 기반 flow별 라우팅 기법을 비교 분석하였다. 이 결과 제안한 기법은 기존 무선 메쉬 네트워크에 비해 네트워크 링크의 77퍼센트 이하 사용 시 전체 링크 대역폭이 최대 57퍼센트의 성능 향상을 보였다. In wireless mesh network environment, limitation of wireless link usability and the bottleneck problem could exist because of traffic characteristic and it leads to reduction of network throughput. As wireless infra network, flexible routing algorithm is also needed to respond to the variable services. In this paper we propose the flow-based routing algorithm based on OpenFlow to solve the problem of the existing mesh network and respond to the requirements. Our routing algorithm uses available bandwidth and the airtime metric which is specified in 802.11s standard. And it decides the routes depending on the flow to improve the whole network’s usage and solve the bottleneck problem. Furthermore we present the method that applies OpenFlow to the mesh network to get flexibility of maintaining network. In this paper we evaluate the performance of the proposed method and analyze the result through the test bed experiment. As a result, our method improves maximum 57 percents of the performance compare with existing wireless mesh networks when 77 percents of the whole links are used.
이수환(Lee, Su-Hwan),김동훈(Kim, Dong-Hoon) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The purpose of this study is to plan a public library for seniors in Korea in the process of welcoming the elderly society. There is an increasing trend of older people looking for libraries to read or read newspapers and magazines. But public libraries are still the places where young people study and there is a strong perception that elders are a reluctant to use. In addition, even if they visit a library, there are some difficulties in using the library under the same conditions as other users due to the physical and mental characteristics of the elderly. Therefore, it is urgent to prepare. From the architectural point of view, we intend to encourage active participation of senior users by planning openness, connection of each space, psychological stability and convenient circulation.