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All-carbon-based cathode for a true high-energy-density Li-O<sub>2</sub> battery
Lim, Hee-Dae,Yun, Young Soo,Cho, Se Youn,Park, Kyu-Young,Song, Min Yeong,Jin, Hyoung-Joon,Kang, Kisuk Elsevier 2017 Carbon Vol.114 No.-
<P>Li-O-2 batteries have a high theoretical energy density; however, their current cathode system based on a heavy metal framework strikingly diminishes their real energy density. Herein, we report the fabrication of all-carbon-based cathodes composed of conventional active carbon and a carbon mesh (CM) framework produced from waste silk fabric by simple pyrolysis. CM frameworks show a high electrical conductivity of similar to 150 S cm(-1), good tensile strength of 34.1 +/- 5.2 MPa, and a Young's modulus of 4.03 +/- 0.7 GPa, as well as a well-ventilated ordered macroporous structure. These all-carbon-based cathodes exhibit stable cycling and high energy densities of similar to 2600 Wh kg(-1) based on total electrode weight, which are 4-15 times higher than those of conventional air cathodes. (C) 2016 Elsevier Ltd. All rights reserved.</P>
윤영상,최종화,김용대,한선경,유영갑 충북대학교 컴퓨터정보통신 연구소 2004 컴퓨터정보통신연구 Vol.12 No.1
본 논문에서 제시한 32비트 테스트 코어는 기존의 ARM과 같은 32비트 RISC 코어를 대신하여 JTAG 및 코어브레이커의 회로 테스트를 위하여 고안되었다. 테스트 코어는 디버깅유닛을 바꾸어가며 재이식(retargetable) 가능하게 사용될 수 있다는 장점을 갖는다. 회로 합성 결과 하드웨어는 ARM과 비교하여 33% 정도의 게이트를 가진다. 테스트 코어는 보다 높은 디버깅 성능을 위해 다중로드(multiple load; LDMA)와 다중저장(multiple store; STMA)명령을 추가하였으며 단일로드(single load; LDR) 또는 단일저장(single store; STR)명령들에 비해 64% 정도의 처리시간 단축을 나타내었다. A 32bit RISC type core is designed to replace full processors for testing JTAG and core breaker modules. It is retargetable and can be utilized to test a debugging unit. The design uses about 33% of gates with respect to a fully designed ARM7. It has instructions, multiple load or store(LDMA, STMA), for debugging purposes. Simulation result shows that they reduce the execution time about 64% with respect to processors having a single load or store(LDR, STR) instruction.
RT-LAMP를 이용한 콩황화일반모자이크바이러스의 진단
배대현, 이영훈, 김봉섭, 윤영남, 강범규, 최만수, 구성철, 김현태, 윤홍태, 이수헌, 백인열 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2
Soybean yellow common mosaic virus (SYCMV) has been recently reported, it has been occurred a lot with Soybean mosaic virus (SMV) and Soybean yellow mottle mosaic virus (SYMMV) in soybean field. SYCMV belongs to genus of Sobemovirus and induced viral symptoms with yellowing, mottle and mosaic. A reverse transcription loop-mediated isothermal amplification (RT-LAMP) method allowed one-step detection of gene amplification by simple procedure and needed only a simple incubator for isothermal template. This RT-LAMP method allowed direct detection of RNA from virus-infected plants without thermal cycling and gel electrophoresis. In this study, we designed RT-LAMP primers named SYCML-F3/B3/FIP/BIP from coat protein gene sequence of SYCMV. After the reaction of RTLAMP, products were identified by electrophoresis and with the detective fluorescent dye, SYBR Green I. under daylight and UV light. Optimal reaction condition was at 63 for 60min and the primers of RTLAMP showed the specificity for only SYCMV tested in this study.
딸기 ‘설향’ 육묘 시 모주의 묘소질과 정식 시기가 런너와 자묘의 생육에 미치는 영향
김대영, 김수, 최학순, 이선이, 허윤찬, 정승룡 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2
This study was conducted to investigate the effect of plantlet quality and transplanting time of mother plants on the growth of runner and daughter plants of strawberry (Fragaria×ananassa) ‘Seolhyang’ during nursery. Plantlet quality of mother plants is expected to be able to distinguish on the basis of crown diameter because crown diameter was highly correlated with fresh weight(r = 0.85), leaf area(r = 0.81), root weight(r = 0.75) and 1st primary roots(r = 0.73). Mother plants were transplanted based on the crown diameter (7~9 mm, 9~11 mm, 11~13 mm and 13~15 mm) in 15 March, 2012. Also, mother plants were transplanted in 15 March, 30 March, 15 April, 30 April and 15 May to investigate the best transplanting date. As a result, the number of daughter plants in the treatment 9~11 mm and 11~13 mm were 22.7 and 22.4 respectively at the end of July. But the number of daughter plants in the treatment of 7~9 mm and 13~15 mm reduced 26% and 16% respectively compared to the average number of the daughter plants in the treatment between 9 mm and 13 mm. The number of daughter plants in the treatment of 15 March, 15 April and 15 May were 20.2, 18.8 and 13.2 respectively at the end of July. Early time of transplanting was able to obtain the more daughter plants and improve the plantlet quality of daughter plants. Therefore, mother plants having crown diameter between 9 mm and 13 mm recommended to be transplanted until the end of March to obtain sufficient daughter plants and improve plantlet quality of daughter plants for producing strawberry fruits.
이윤수,김대훈,박종운,김영재,장근선,권영철 선문대학교 2001 공학계열 논총 Vol.4 No.-
본 연구는 전기장에 의한 전열촉진관내 유동비등 열전달 현상을 이해하기 위해 수행되었다. 이를 위해 전기장이 인가되지 않았을 때와 전기장이 인가되었을 때의 R-22를 작동유체로 하는 마이크로핀관 내의 비등 열전달계수 및 압력강하들 조사하였다. 실험변수들로 시험부 입구건도, 질량유속, 열유속, DC 고전압을 선정하였고, 시험부내 증발온도는 5℃로 고정시키고 실험을 수행하였다. 본 실험을 통하여. 저건도 영역에서 유동비등의 열전달촉진에 대한 전 기장의 효과로 비등 열전달계수가 전기장이 인가되지 않은 경우에 비해 뚜렷이 증가함을 알 수 있었다. 관내의 압력강하는 거의 선형적으로 증가하였으며, 관내 압력강하 효과는 전기장 하에서 더 크게 관찰되었다. An experimental study on boiling heat transfer characteristics in a micro-fin tube has been performed. The micro-fin tube with outer diameter of 9.56 mm were used as test section, and it was heated by applying hot liquid to the test tube. The working fluid was R-22 and the tube-circular electrode system was used. The DC voltage was applied to the circular electrode, while the tube was grounded. The present study shows the enhancement of the boiling heat transfer coefficient of the tube is largely increased under the high voltage, compared with that of the normal condition(zero voltage). It is found at low inlet quality condition that the mechanisms of EHD in-tube boiling are closely connected with the dynamic behavior of bubbles. With increasing the mass flux and inlet quality, the pressure drop in a micro-fin tube increases linearly.