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Bendable and Splitter-Integrated Optical Subassembly Based on a Flexible Optical Board
Sung Hwan Hwang,Jung Woon Lim,Woo-Jin Lee,Gye Won Kim,Che Hyun Cho,Jong Bea An,Ki Young Jung,Kyung Soon Cha,Byung Sup Rho IEEE 2010 IEEE photonics technology letters Vol.22 No.3
<P>A bendable and splitter-integrated optical subassembly (OSA) is suggested as a short-distance board-to-board optical interconnection. This OSA was fabricated by simply packaging a vertical-cavity surface-emitting laser on a flexible optical board having an embedded 1 × 8 optical splitter waveguide. Finally, we measured various optical characteristics of the OSA, including insertion, twist, and bending losses.</P>
Effect of the foliar application of selenium on selenium content of whole- crop barley
In-Bea Choi,Jung-Joon Lee,Jae-Hwan Nho,Kwang-Min Cho,Sang-Kyun Cho,Tai-Il Park,Hyeong-Ho Park,Tae-Hwa Song,Kee-Jong Kim,Ik-Hwan Jo 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
A field experiment was conducted to evaluate the varietal variation of Se concentration and to determine the effects of selenium foliar applications on the productivity and agronomic characteristics of the whole-crop barleys. Se fertilizer was foliar applied at five levels(0, 50, 100, 200, 400 ppm) and two forms (sodium selenite and sodium selenate solution) at stem elongation stage, the middle of April. Cultivar effects on whole-plant Se contents were small and not significant. Regardless treatments, there were no remarkable effects on dry matter yield and forage quality of whole crop barleys. Se contents of plant was higher in selenate application by 3~10 times than selenite. In selenate treatments, as Se levels were raised from 50 ppm to 400ppm the Se contents were increased from 331ppb to 3433ppb and Se contents were positively correlated with the rate of Se application levels. Selenium(Se) is an essential nutritional trace element, which is needed for growth and reproduction in all living animals. But the line between the requirement and harmfulness of Se is narrow since selenium is a highly toxic element. The level of Se in feeds of plant varies depending on plant species, growing season and soil which the plants grow on. Because of low concentration of Se in domestic soils, the selenium availability to plants is limited and it is necessary to supplement feed with selenium. Generally organic Se is less toxic and more efficiently utilized than inorganic Se. Under the condition that antibiotics use in feed are prohibited, selenium enriched whole-crop barley can be one way to improve animal health.
연구보문 : 자연과학 ; 동계 사료용 맥류와 하계 사료용 옥수수 작부체계 연구
조상균 ( Sang Kyun Cho ),조광민 ( Kwang Min Cho ),박태일 ( Tae Il Park ),박형호 ( Hyeong Ho Park ),노재환 ( Jae Hwan Roh ),최인배 ( In Bea Choi ),오영진 ( Young Jin Oh ),송태화 ( Tae Hwa Song ),김기종 ( Kee Jong Kim ),박기훈 ( Ki 한국국제농업개발학회 2012 韓國國際農業開發學會誌 Vol.24 No.3
This experiment was carried out for two years from 2010 to 2011 in Kimjae city to provide basis of ``Winter forage crop-Summer forage corn`` cultivation system in southern area of Korea. The cultivars tested were ``Gokwoo`` as rye, ``Kumgang`` as wheat and ``Youngyang`` as barley as winter forage crops and ``Kwangpyeongok`` as corn for the summer forage crop. Regarding to winter forage crops, biomass of rye in fresh weight was 301.4 ton/ha and its income indicated 1,841 thousands Korean Won (KRW)/ha, an increase of 141% compared to naked barley grain production(NBGP). Biomass of barley was 30.6 ton/ha and the income showed 3,151 thousand KRW/ha, an increase of 242% compared to NBGP. Biomass of wheat recorded as 40.5 ton/ha with the most productive result among three winter forage crops and the income was 3,740 thousand KRW/ha, meaning 287% increase in comparison with NBGP. Regarding to summer forage corn cultivation, biomass production after rye was 56.7ton/ha in fresh weight and its income gained 4,731 thousand KRW/ha with an increase of 88% compared to single cropping rice(SCR). Biomass after barley produced 51.4ton/ha and the income was 3,828 thousand KRW/ha, showing a increase of 71% compared SCR. Biomass after wheat recorded as 31.0 ton/ha with the lowest productivity among three summer forage cultivations after each winter forage crops and the income of 372 thousand KRW/ha, an increase of 7% in comparison with SCR. With regard to total roughage production of each winter-summer forage crop combinations, total biomass production of ryecorn system was 87.1 ton/ha and the income recorded 6,572 thousand KRW/ha, similar to that of NBGP plus SCR. Biomass of barley-corn system produced 87.4ton/ha and the income was 6,979 thousand KRW/ha, a 105%-rise over that of NBGP plus SCR. Biomass of wheat-corn system recorded 71.6 ton/ha with the lowest result among three winter-summer forage corp combinations and the income of 4,112 thousand KRW/ha with an growth of 62% in comparsion with that of NBGP plus SCR.
배거성,손기환,Bea, Goe-Sung,Son, Ki-Hwan 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.7
우리나라의 일교차는 커지고 있으며, 기후로 인한 철도 피해와 경제적 손실에 대한 보고로 환경이 열악해지는 것을 알 수 있다. 이러한 상황에서도 철도용 모니터링 장치는 운영과 관리를 지원하기 위해 상시 동작해야 하는 장치다. 따라서 본 연구에서는 COM 기반의 모니터링 장치를 산업용-확장 전자부품을 사용하여 구현 및 제작하였으며, 실제 철도 온도환경에 적합 여부를 시험하였다. 시험을 통해 모니터링 장치의 내한성, 내열성에 대한 검증을 할 수 있었다. 제품에 사용된 부품은 철도산업의 전자제품 개발에 활용할 수 있을 것이다. The diurnal range of temperature in korea is increasing. We know that the environment has deteriorated through report about railway damage and economic loss caused by climate. In these conditions, Monitoring device for railway must operate to support the operations and maintenance. Therefore, In this paper, COM-based monitoring device implemented using Industrial-Extended electronic components and made, We tested compliance about temperature environment of actual railway. We verified through testing about cold and dry heat of monitoring device. Used components in this product will be able to utilize the development of the railway industry of electronics.
Surface Input/Output Optical Splitter Film for Multilayer Optical Circuits
Woo-Jin Lee,Sung Hwan Hwang,Myoung Jin Kim,Eun Joo Jung,Jong Bea An,Gye Won Kim,Myung Yung Jeong,Byung Sup Rho IEEE 2012 IEEE photonics technology letters Vol.24 No.6
<P>A polymeric splitter film with input/output apertures on the surface is presented for multilayer optical circuits. We fabricated the surface input/output splitter via an ultraviolet imprint method using a mirror-integrated master. To fabricate the master, waveguide patterns were formed on a silicon wafer using a deep reactive ion etching method, and 45° angled mirrors as beam reflector were constructed at the waveguide core patterns via a V-sawing technique. We subsequently manufactured 1×2 and 1×4 surface input/output optical splitters and measured the optical characteristics of the splitters.</P>
COVID-19 대응 비접촉 모듈러 선별진료소 개발 및 성능검증
조진균(Jinkyun Cho),송종운(Jongwoon Song),배상환(Sang Hwan Bea) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
With the ongoing COVID-19 pandemic, the number of individuals that need to be tested for COVID-19 has been rapidly increasing. Temporary or mobile screening/testing centers are being widely utilized in response to outbreaks and epidemics. Temporary screening centers are being widely utilized in response to outbreaks and epidemics. However, there is a risk of cross-infection at each stage of screening treatment, including the booths, and adverse reactions with disinfection of the booths. A non-contact modular screening center (NCMSC) using negative pressure booths with the biosafety cabinet has been developed and implemented for safe, fast and easy screening of COVID-19. The NCMSC increases patient access to the screening clinics and adequately protects healthcare personnel while reducing the consumption of personal protective equipment. It can also increase the number of people tested. In this study, the NCMSC was investigated experimentally for cross-infection prevention effects. Image processing based laser-diagnostics techniques including particle image velocimetry (PIV) was employed to characterize flow dynamics in the NCMSC by taking advantage of the state-of-the-art high-speed cameras and an infrared (IR) camera.