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백색 LED용 색변환 렌즈의 열처리 온도 및 코팅 두께에 따른 영향
이효성,황종희,임태영,김진호,정현석,이미재,Lee, Hyo-Sung,Hwang, Jong Hee,Lim, Tae-Young,Kim, Jin-Ho,Jung, Hyun-Suk,Lee, Mi Jai 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
Today, silicon and epoxy resin are used as materials of conversion lenses for white LEDs on the basis of their good bonding and transparency in LED packages. But these materials give rise to long-term performance problems such as reaction with water, yellowing transition, and shrinkage by heat. These problems are major factors underlying performance deterioration of LEDs. In this study, in order to address these problems, we fabricated a conversion lenses using glass, which has good chemical durability and is stable to heat. The fabricated conversion lenses were applied to a remote phosphor type. In this experiment, the conversion lens for white LED was coated on a glass substrate by a screen printing method using paste. The thickness of the coated conversion lens was controlled during 2 or 3 iterations of coating. The conversion lens fabricated under high heat treatment temperature and with a thin coating showed higher luminance efficiency and CCT closer to white light than fabricated lenses under low heat treatment temperature or a thick coating. The conversion lens with $32{\mu}m$ coating thickness showed the best optical properties: the measured values of the CCT, CRI, and luminance efficiency were 4468 K, 68, and 142.22 lm/w in 20 wt% glass frit, 80 wt% phosphor with sintering at $800^{\circ}C$.
플라즈마분자선에피탁시법을 이용한 사파이어 기판 위 질화알루미늄 박막의 에피탁시 성장
이효성,한석규,임동석,신은정,임세환,홍순구,정명호,이정용,Lee, Hyo-Sung,Han, Seok-Kyu,Lim, Dong-Seok,Shin, Eun-Jung,Lim, Se-Hwan,Hong, Soon-Ku,Jeong, Myoung-Ho,Lee, Jeong-Yong,Yao, Takafumi 한국재료학회 2011 한국재료학회지 Vol.21 No.11
We report growth of epitaxial AlN thin films on c-plane sapphire substrates by plasma-assisted molecular beam epitaxy. To achieve two-dimensional growth the substrates were nitrided by nitrogen plasma prior to the AlN growth, which resulted in the formation of a two-dimensional single crystalline AlN layer. The formation of the two-dimensional AlN layer by the nitridation process was confirmed by the observation of streaky reflection high energy electron diffraction (RHEED) patterns. The growth of AlN thin films was performed on the nitrided AlN layer by changing the Al beam flux with the fixed nitrogen flux at 860$^{\circ}C$. The growth mode of AlN films was also affected by the beam flux. By increasing the Al beam flux, two-dimensional growth of AlN films was favored, and a very flat surface with a root mean square roughness of 0.196 nm (for the 2 ${\mu}m$ ${\times}$ 2 ${\mu}m$ area) was obtained. Interestingly, additional diffraction lines were observed for the two-dimensionally grown AlN films, which were probably caused by the Al adlayer, which was similar to a report of Ga adlayer in the two-dimensional growth of GaN. Al droplets were observed in the sample grown with a higher Al beam flux after cooling to room temperature, which resulted from the excessive Al flux.
이효성,김병호,황종희,임태영,김진호,전대우,정현석,이미재,Lee, Hyo-Sung,Kim, Byung-Ho,Hwang, Jong Hee,Lim, Tae-Young,Kim, Jin-Ho,Jeon, Dae-Woo,Jung, Hyun-Suk,Lee, Mi Jai 한국재료학회 2016 한국재료학회지 Vol.26 No.1
In this study, we fabricated high quality color conversion component with green/red phosphor and low melting glass frit. The color conversion component was prepared by placing the green and red phosphor layer on slide glass via screen printing process. The properties of color conversion component could be controlled by changing coating sequence, layer thickness and heat treatment temperature. We discovered that optical properties of color conversion component were generally determined by the lowest layer. On the other hand, the heat treatment temperature also affected to correlated color temperature (CCT) and color rending index (CRI). The color conversion component with a green (lower) - red (upper) layer which was sintered at $550^{\circ}C$ showed the best optical properties: CCT, CRI and luminance efficacy were 3340 K, 78, and 56.5 lm/w, respectively.
IKONOS 입체영상의 토지피복 특성에 따른 정합영역 크기 결정
이효성,박병욱,이병길,안기원,Lee, Hyo-Seong,Park, Byung-Uk,Lee, Byung-Gil,Ahn, Ki-Weon 한국측량학회 2007 한국측량학회지 Vol.25 No.6
본 연구는 IKONOS Geo레벨 스테레오 영상으로부터 DEM을 제작하기 위한 토지피복 특성별 정합영역 크기를 결정하고자 한다. 사용된 매칭기법은 상관계수를 이용한 영역기반정합 기법을 적용하였고, 탐색영역을 최소화하기 위해 외부표정요소를 구한 후, 이로부터 정합선을 수립하여 정합하였다. 실험은 산림, 논 밭, 수계, 도심지의 4가지 토지피복 특성별로 수행되어졌으며, 토지피복별 평균 상관계수, 칼럼 라인의 시차영상을 분석한 후, 실험 영상에서 최적의 정합영역 크기를 선정하였다. 실험결과, 산림지역은 $119{\times}119$화소, 논 밭 지역은 $51{\times}51$화소, 물 지역은 $81{\times}81$화소, 도심지는 $21{\times}21$화소가 DEM 제작을 위한 가장 적절한 정합영역 크기로 선정되었다. This study determines matching size for digital elevation model (DEM) production according to land cover property from IKONOS Geo-level stereo image. We applied area based matching method using correlation coefficient of pixel brightness value between the two images. After matching line (where "matching line" implies straight line that is approximated to complex non-linear epipolar geometry) is established by exterior orientation parameters to minimize search area, the matching is carried out based on this line. The experiment is performed according to land cover property, which is divided off into four areas (water, urban land, forest land and agricultural land). In each of the test areas, matching size is selected using a correlation-coefficient image and parallax image. As the results, optimum matching size of the images was selected as $81{\times}81$ pixels window, $21{\times}21$ pixels window, $119{\times}119$ pixels window and $51{\times}51$ pixels window in the water area, urban land, forest land and agricultural land, respectively.
Financial Technology API 활용 통합계좌 잔액 알림 서비스 모바일 어플리케이션
이효성(HyoSeong Lee),이주환(JuHwan Lee),이택(Taek Lee),장기성(GiSeong Jang),이정휴(JungHue Lee),유철중(Cheol-Jung Yoo) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10
오픈뱅킹(Open banking) 기술이 등장한 이후로 사용자는 한 가지 금융 모바일 어플리케이션으로 모든 계좌정보에 대한 잔액을 확인할 수 있게 되었다. 기존 시장에 나와 있는 관련 금융 어플리케이션에서는 여러 계좌를 등록하고 통합잔액을 알려주는 기능을 제공하지만 수동으로 계좌정보를 확인해야 한다는 단점이 있었다. 프로젝트에서는 위의 오픈뱅킹 기술을 이용하여 여러 계좌의 잔액을 보여주는 통합잔액 조회 기능을 구현하였고, 수동적으로 어플리케이션에 접근해야 한다는 단점을 해결하기 위해 위젯 기능을 활용하여 어플리케이션을 실행하지 않고 실시간으로 계좌의 잔액을 확인할 수 있는 기능을 구현하였다. Since the advent of open banking technology, users have been able to check the balance of all accounts with one bank mobile application. Related banking applications in the existing market offer the ability to register multiple accounts and inform the integrated balance, but they had the disadvantage of having to check account information manually. The project implemented an integrated balance inquiry function that shows the balance of multiple accounts using the open banking technology above, and a function that allows users to check the balance of accounts in real time without running the application by utilizing the widget function to address the disadvantage of passive access to the application.
이효성(Hyo Seong Lee),김용수(Yong Soo Kim),이경섭(Kyeong-Seob Lee),한지현(Ji Hyun Han),이찬용(Chan Yong Lee),김기광(Kee K. Kim) 한국생물공학회 2020 KSBB Journal Vol.35 No.3
Musk is a traditional high-grade medical product that has a great anti-inflammatory activity. However, musk is a poorly soluble substance, which is difficult to use in the food and drug field. Therefore, in order to increase the efficacy of musk, research on the water-solubilization of musk is necessary. In this study, we have applied the water-solublization technology to musk and the solubility of musk with water-solubilization technology was compared with the solubility of musk without water-solubilization technology to confirm the water-solubility. Next, we investigated antioxidant efficacy of musk with water-solublization technology and effect of musk with water-solublization technology on anti-inflammatory activity using mouse macrophage RAW 264.7 cells. As a result, musk with water-solublization technology showed excellent radical scavenging ability. the mRNA expressions of IL-1β, IL-6, which cytokines released during inflammatory reactions, were repressed and the activity of mouse macrophages increased by treatment of musk with water-solublization technology. In conclusion, these results suggest that water-solublization technology improved the absorption of musk and musk with water-solublization technology can increase musk’s antioxidant activity and anti-inflammatory activity, which can be used in various fields including the food and drug fields.
연구 논문 : KOMPSAT-3 위성영상의 RPC 보정을 위한 국가 통합기준점 탐지
이효성 ( Hyo Seong Lee ),한동엽 ( Dong Yeob Han ),서두천 ( Doo Chun Seo ),박병욱 ( Byung Wook Park ),안기원 ( Ki Weon Ahn ) 대한원격탐사학회 2014 大韓遠隔探査學會誌 Vol.30 No.6
The KOMPSAT-3 can acquire panchromatic stereo image with 0.7 m spatial resolution, and provides Rational Polynomial Coefficient (RPC). In order to determine ground coordinate using the provides RPC, which include interior-exterior orientation errors, its adjustment is needed by using the Ground Control Point (GCP). Several thousands of national Unified Control Points (UCPs) are established and overall distributed in the country by the Korean National Geographic Information Institute (NGII). UCPs therefore can be easily searched and downloaded by the national-control-point-record-issues system. This paper introduced the point-extraction method and the distance-bearing method to detect of UCPs. As results, the distance-bearing method was better detected through the experiment. RPC adjustment using this method was compared with that by only one UCP and GCPs using GPS. The proposed method was more accurate than the other method in the horizontal. As demonstrated in this paper, the proposed UCPs detection method could be replaced GPS surveying for RPC adjustment.