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빅데이터를 활용한 기후변화와 연계된 생태계서비스 연구 동향분석
서자유 ( Seo J A-yoo ),최요한 ( Choi Yo-han ),백지원 ( Baek J I-won ),김수경 ( Kim Su-kyoung ),김호걸 ( Kim Ho-gul ),송원경 ( Song Won-kyong ),주우영 ( Joo Woo-yeong ),박찬 ( Park Chan ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.6
This study was performed to investigate the ecosystem service patterns in relation to climate change acceleration utilizing big data analysis. This study aimed to use big data analysis as one of the network of views to identify convergent thinking in two fields: climate change and ecosystem service. The keywords were analysed to ascertain if there were any differences in the perceiving problems, policy direction, climate change implications, and regional differences. In addition, we examined the research keywords of each continent, the centre of ecosystem service research, and the topics to be referred to in domestic research. The results of the analysis are as follows: First, the keyword centrality of climate change is similar to the detailed indicators of The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) regulations, content, and non-material ecosystem services. Second, the cross-analysis of terms in two journals showed a difference in value-oriented point; the Ecosystem Service Journal identified green infrastructure as having economic value, whereas the Climate Change Journal perceives water, forest, carbon, and biodiversity as management topics. The Climate Change Journal, but not the former, focuses on future predictions. Third, the analysis of the research topics according to continents showed that water and soil are closely related to the economy, and thus, play an important role in policy formulation. This disparity is due to differences in each continent's environmental characteristics, as well as economic and policy issues. This fact can be used to refer to the direction of research on ecosystem services in Korea. Consistent with the recent trend of expanding research regarding the impacts of climate change, it is necessary to study strategies to scientifically predict and respond to the negative effects of climate change.
Bacillus thuringiensis와 Neem oil에 대한 배추좀나방의 살충활성
조민수(Min-Su Cho),최수연(Su-Yeon Choi),김택환(Tae-Whan Kim),박찬(Chan Park),김담아(Dam-A Kim),김영림(Young-Rim Kim),오세문(Se-Mun Oh),김성우(Sung-Woo Kim),윤영남(Young-Nam Youn),유용만(Yong-Man Yu) 한국농약과학회 2009 농약과학회지 Vol.13 No.4
For the environmental friendly management of diamondback moth, Plutella xylostella (L.), Bacillus thuringiensis subsp. kurstaki (30×108 cfu/mg) and neem oil (0.5% azadirachtin) were used as green control agencies with mixed and alternative treatments on the chinese cabbage. When Bacillus thuringiensis subsp. kurstaki was applied to 1st and 2nd larva of P. xylostella with recommended concentration, their mortalities were reached to 100% by 2 days after treatment. In case of azadirachtin, its effect of mortality was continued for 7 days, and reached to 100% mortality. LC?? values of Bacillus thuringiensis subsp. kurstaki and azadirachtin against 1st, 2nd, 3rd and 4th larva of P. xylostella were 2.8×10⁴, 3.1×10⁴, 3.4×10⁴ and 1.5×10? cfu/ml, and 2.7, 3.9, 4.7 and 7.1 ppm, respectively. The number of laid eggs of P. xylostella was reduced to 57.5 at 25 ppm of azadirachtin compared with control treatment. The hatch ratio was not significantly different with Bacillus thuringiensis subsp. kurstaki treatment in comparison with control treatment. However, when azadirachtin was applied, their hatch ratio were reduced to 25.8 and 45.4% at 25 and 50 ppm, respectively. On the other hand, emergence rate of eggs was not different with Bacillus thuringiensis subsp. kurstaki treatment, but 45.4% was shown in azadirachtin treatment with 50 ppm in comparison with control. When the mixture with Bacillus thuringiensis subsp. kurstaki and azadirachtin was applied to adults of P. xylostella, their mortality was higher than Bacillus thuringiensis subsp. kurstaki treatment only. These results are supposed that the mixture of Bacillus thuringiensis subsp. kurstaki and azadirachtin might be used as green control agents for reducing the demage of diamondback moth in the Chinse cabbage.
Effect of thermocycling process on compomers
Kwon, Yong Hoon,Park, Chan-A,Kim, Hyung-Il 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.1
The purpose of this study was to test the effect of thermocycling process of commercial compomers by evaluating the microhardness, coefficient of thermal expansion, and surface modifications. Three compomers (Compoglass F (vivadent), Dyract AP (De Trey), F2000 (3M)) were prepared and light-polymerized for 40 seconds exposure at 700 ㎷/㎠ light intensity conditions. The prepared specimens were thermocycled between 4 and 60℃ water baths for 2000, 5000, and 10000 cycles. As results, the initial value of each compomer's microhardness was significantly reduced after the initiation of the thermocycling process. However, during the process, the changes of hardness of each compomer were statistically insignificant. The coefficient of thermal expansion of each compomer was increased as the number of thermocycle increased, then decreased at the end of the process. From the SEM observations, the reason may be attributed to the detechment of fillers from the surface of Compoglass F and Dyract AP. Unlike these compomers, F2000 showed the formation and propagation of cracks on the surface. These cracks may relax or absorb the generated stress due to the linear thermal expansion of the specimen.