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고굴절률 폴리머층과 에포다이즈드 브래그 격자를 이용한 고반사 파장 필터
김언태,박태현,황광호,오민철 한국광학회 2017 한국광학회지 Vol.28 No.6
A tunable filter incorporating an apodized grating with a high-refractive-index polymer layer is demonstrated. In the apodizedtunable filter, the reflectivity is decreased compared to that of a uniform grating, because of the gradually decreased grating depth. To increase the reflectivity of the apodized grating, a polymer of high refractive index is adopted for the apodized grating, andthen high reflectivity is obtained while maintaining a narrow bandwidth. The apodized tunable filter exhibits a 3-dB bandwidthof 0.51 nm and a 20-dB bandwidth of 1.05 nm, with 98.5% reflection.
고온 스트레스 환경에 노출된 홀스타인종 젖소의 회복기 면역 변화 특성 규명
김언태 한국초지조사료학회 2023 한국초지조사료학회지 Vol.43 No.4
This study was performed to investigate immune changes by comparing the proportion and function of immune cells in the blood under high-temperature period and convalescence temperature period in Holstein dairy cows. The experiment was conducted using Holstein dairy cows of five animals per group (60 ± 20 months old, 175 ± 78 non-day) from the National Institute of Animal Science at high-temperature period (THI: 76 ± 1.2) and convalescence temperature period (THI: 66 ± 1.3). Complete blood count results showed no change in the number of immune cells between groups. In the analysis using Flow Cytometry of PBMCs, no significant differences were observed among B cells, Helper T cells, cytotoxic T cells, and γδ T cells between groups. However, there was an increase in Th17 cells producing IL-17a, while Th1 cells decreased during the convalescence temperature period. The results of gene expression analysis using qRT-PCR in PBMCs revealed an increase in IL-10 during the convalescence temperature period, while a decrease in HSP70 and HSP90 was observed. In conclusion, the increased expression of IL-10 and the decrease in HSP expression suggest the possibility of a weak recovery from heat stress. However, the lack of observed changes in B cells, T cells, and other immune cells indicates incomplete recovery from heat stress during the convalescence temperature period.
김언태,옥지운,이신자,김진욱,권응기,임동현,최순호,이성실 경상대학교 농업생명과학연구원 2014 농업생명과학연구 Vol.48 No.3
The objective of this study was to know the in vitro effects of supplemental anthelminticplant extracts on the inhibition of protozoa for reducing methane production in the rumen. Afistulated Holstein cow was used as a donor of rumen fluid. The plant extracts (Lonicerajaponica, Zanthoxylum piperitum, Pyrethrum, Torreya nucifera, Ruta graveolens) known to haveanthelmintic effect were added to the in vitro fermentation bottles containing the rumen fluidand medium. The rumen protozoal population was depressed by the addition of Pyrethrum,Torreya nucifera and Ruta graveolens. The methane production was also significantly (p<0.05)reduced by addition of Pyrethrum (2.20 ml/g DM), Torreya nucifera (2.36 ml/g DM) and Rutagraveolens (2.20 ml/g DM). The microbial growth in the treatments of Ruta graveolens orZanthoxylum piperitum was the greatest after 12 h and 24 h incubations, respectively. Theresults of this study indicated that anthelmintic plant extracts appeared to reduce methaneproduction by inhibition of ruminal protozoa related with the methanogens living endosymbioticin protozoal cells.
버그 심각도 예측에 버그 리포트의 다중 토픽 분석 및 CNN 알고리즘 적용
김언태,양근석,정인홍 한국정보과학회 2023 정보과학회논문지 Vol.50 No.11
Bugs are common in software development. Depending on the severity of bugs, they can be classified as major errors and minor errors. In addition, the severity of the bug can be selected by the bug reporter. However, the bug reporter could apply subjective judgment, which can lead to errors in the severity judgment. To resolve this problem, in this study, we predict the bug severity by applying topic-based Severe and Non-Severe extraction with convolutional neural network (CNN) learning. First, by using the properties of the bug report, is the predicting process is divided into Global topic, Product topic, Component topic and Priority topic and the bug reports are extracted from each topic based on Severe and Non-Severe. The Severe and Non-Severe features are extracted from the Global topics, and severity features are extracted from the Product, Component and Priority topics in the same way. The extracted features are combined, put into the CNN algorithm as an input layer, and the model is trained. To evaluate the efficiency of our model, a comparison between the proposed model and the baselines were conducted in the Eclipse, Mozilla, Apache and KDE open-source projects. Our model showed an improved performance. The results showed 97% for Eclipse, 96% for Mozilla, 95% for Apache and 99% for KDE, showing an average performance improvement of about 24.59% compared to the baseline, and a statistically significant difference.
김언태,Le Luo Guan,Shin J. Lee,Sang M. Lee,이상석,Il D. Lee,Su K. Lee,이성실 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.4
The objective of this study was to evaluate the in vitro effects of flavonoid-rich plant extracts (PE) on ruminal fermentation characteristics and methane emission by studying their effectiveness for methanogenesis in the rumen. A fistulated Holstein cow was used as a donor of rumen fluid. The PE (Punica granatum, Betula schmidtii, Ginkgo biloba, Camellia japonica, and Cudrania tricuspidata) known to have high concentrations of flavonoid were added to an in vitro fermentation incubated with rumen fluid. Total gas production and microbial growth with all PE was higher than that of the control at 24 h incubation, while the methane emission was significantly lower (p<0.05) than that of the control. The decrease in methane accumulation relative to the control was 47.6%, 39.6%, 46.7%, 47.9%, and 48.8% for Punica, Betula, Ginkgo, Camellia, and Cudrania treatments, respectively. Ciliate populations were reduced by more than 60% in flavonoid-rich PE treatments. The Fibrobacter succinogenes diversity in all added flavonoid-rich PE was shown to increase, while the Ruminoccocus albus and R. flavefaciens populations in all PE decreased as compared with the control. In particular, the F. succinogenes community with the addition of Birch extract increased to a greater extent than that of others. In conclusion, the results of this study showed that flavonoid-rich PE decreased ruminal methane emission without adversely affecting ruminal fermentation characteristics in vitro in 24 h incubation time, suggesting that the flavonoid-rich PE have potential possibility as bio-active regulator for ruminants.