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Seungho Ahn,Jaeho Cho,Sungha Baek,Kangjin Kim,Jinyoung Ko,Cha-Lee Myung,Simsoo Park 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.2
To meet greenhouse gas (GHG) emission target, automotive manufacturers should promote low carbon emission technology, including gasoline direct injection (GDI) systems. However, recent studies have shown that excessive levels of nanoparticles were emitted from GDI vehicles compared to port fuel injection (PFI) vehicles. One of the many ways to decrease nanoparticle emissions from GDI engine is to use alternative fuel This study used turbo charged 2.0 L 4-cylinder LPG direct injection engine (T-LPDi) that was converted from a turbo charged gasoline direct injection engine (T-GDI) with dedicated LPG fuel supply and control system. To analysis on combustion phenomena and nanoparticle emissions, in-cylinder pressure and exhaust gas were measured under engine dynamometer test. Additionally, various engine control parameters were swung to understand the effects of the control parameters on combustion and nanoparticle characteristics. Throughout th is s tudy, T-LPDi e ngine, c ompared to T-GDI e ngine, s h owed ~ 9 % a nd 76 % r eduction of CO2 and PN emissions respectively. By optimizing engine parameters based on parametric study, PN emissions were improved 70 % from the baseline of T-LPDi engine emissions.
모창연(Changyeun Mo),이강진(Kangjin Lee),임종국(Jong-Guk Lim),강석원(Sukwon Kang),이현동(Hyun-Dong Lee),조병관(Byoung-Kwan Cho) 충남대학교 농업과학연구소 2012 농업과학연구 Vol.39 No.4
In this research, the feasibility of non-destructive measurement technique of pungency measurement was investigated for the red-pepper powders produced in different domestic areas in South Korea. The near-infrared absorption spectra in the range of 1100 nm~2300 ㎚ was used to measure capsaicinoids content in red-pepper powders by using a NIR spectroscopy equipped with Acousto-optic tunable filters (AOTF). Fourth three different red-pepper powders from 14 different locations were collected and separated in three different particle size (below 0.425 ㎜, 0.425~0.71 ㎜, 0.71~1.4 ㎜) for the spectral measurements. The partial least square regression (PLSR) models to predict the capsaicinoids content depends on particle size were developed with the measured spectra. The determinant coefficients and standard errors of the developed models for the red-pepper powders of below 0.425 ㎜, 0.425~0.71 ㎜, and 0.71~1.4 ㎜ were in the range of 0.859~0.887 and 12.90~12.99 ㎎/100 g, respectively. The PLS model with the pretreatment of Standard Normal Variate (SNV) for the red-pepper powders below 1.4 mm particle size showed the best performance with the determinant coefficient of 0.844 and the standard error of 14.63 ㎎/100 g.
Antiviral Activity of a Type 1 Ribosome - inactivating Protein from Chenopodium album L .
Lee , Si Myung,, Cho, KangJin,Kim, Yeong Tae,Park, Hee Young,Kim, Su Il 한국농화학회 1999 Applied Biological Chemistry (Appl Biol Chem) Vol.42 No.4
The antiviral activity of CAP30 from Chenopodium album, a type1 ribosome-inactivating protein (RIP), was examined against 5 different plant viral pathogens, and its activity against Tobacco mosaic virus was compared to those of well known antiviral proteins such as Pokeweed Antiviral protein from leaves and seeds. When the inoculating concentration of Tobacco mosaic virus was varied from 0.4 to 400 ㎍/㎖, it was observed that CAP30 at the concentration of 1 ㎍/㎖ suppressed the viral infection of C. amaranthicolor and C. quinoa almost completely up to 40 ㎍/㎖ Tobacco mosaic virus. Results from the assays for the inhibitions of in vitro translation of rabbit reticulocyte lysate and the suppression of Tobacco mosaic virus infection (10 ㎍/㎖) to C. quinoa indicated that CAP30 is a strong inhibitor of protein synthesis and virus infection. The infection of several viruses other than Tobacco mosaic virus to host plants were also inhibited by 5 ㎍/㎖ CAP30, suggesting that a gene encoding CAP30 can be used to develop transgenic virus-resistant plants.
수경재배 토마토 과실 모니터링을 위한 다중분광 영상의 적용 가능성
조병효 ( Byeong-hyo Cho ),이성민 ( Seongmin Lee ),이강진 ( Kangjin Lee ),홍영기 ( Youngki Homg ),김경철 ( Kyoung-chul Kim ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2
토마토 시설재배는 재배 기간 연장, 기후 변화 대응, 안정적인 생육 환경 유지 등 여러 가지 이점을 가지고 있으며, 이러한 이유로 국내의 모든 토마토는 시설 내에서 재배되고 있다. 그럼에도 불구하고 원치않게 발생하는 병해 및 생리장해로 인하여 토마토 농가는 매년 경제적 손실을 겪고 있다. 특히, 배꼽썩음병은 토마토 생산량의 최대 50%를 감소시켜 농가에 큰 경제적 손실을 초래할 수 있다고 알려져 있다. 배꼽썩음병은 주로 어린 과실에서 발생하며, 꽃이 떨어진 부위에서 흑갈색으로 함몰되어 말라버리거나 썩는 특징이 있다. 배꼽썩음병의 정확한 원인은 현재까지 규명되지 않았기 때문에 이를 방지하는 것은 어려우며, 현재로서는 발견하는 즉시 제거하는 것이 경제적 손실을 줄이기 위해 가장 좋은 방법으로 알려져 있다. 따라서, 본 연구에서는 토마토 배꼽썩음병을 조기에 인식하기 위해 다중분광 영상의 적용 가능성을 검토하고자 하였다. 시험대상은 배꼽썩음병에 걸린 토마토(50개)와 정상 토마토(50개)를 사용하였으며, 토마토는 국립농업과학원 첨단 디지털온실에서 수경 수직유인 방식으로 재배되었다. 다중분광 영상은 휴대용 다중분광카메라(Monarch2, UNISPECTRAL, Ramat Gan, Israel)를 이용하여 700~950 nm 대역에서 10개의 다중분광 영상을 취득하였다. 취득한 영상은 분광 영상분석 프로그램(Breeze, Prediktera, Umea, Sweden)을 이용하여 전처리를 거친 후 배꼽썩음과 분류 모델을 개발하였다. 그 결과, Light-GBM (Light-Gradient Boosting Machine) 모델을 이용할 경우 약 93%의 f-score로 배꼽썩음과의 분류가 가능하였다. 향후에는 다양한 환경에서 추가적인 실험을 통해 모델의 정확도를 개선할 예정이다.