코로나 검출기를 이용한 배전설비 진단기법

조용상(Yong-Sang Cho),송규소(Gyu-So Song),최유성(Yu-Seong Choi),박태성(Tae-Seong Park) 대한전기학회 2011 전기학회논문지 Vol.60 No.3

The airpollutant may accelerate degradation of power line facilities, and may reduce the life of the electric facilities. In case of korea, there are a tendency that the density of air pollution may be increased by industrial development. while lack of research activity and establishment of a countermeasure on this issue. Recently the occurrence of electricity failure have been reduced on the power transmission and distribution lines. but the occurrence of electricity failure by insulator itself has been increased. It means that we should have develop more clear technique for detection of the wrong insulator. In this study to provide a method for detection of the insulator failure or effective management of the troubled insulator, we analyze the chemical composition of the insulator which used on power distribution line at the sea side locations. To define the relation between insulation and corona intensity, we design and develop an corona detector. We define the variation of insulation by pollution changes on the insulator and verify quantitative relation between corona and insulations using the corona detector.

논 토양에서의 Anammox 세균 특이 유전자의 수직 분포

조유성 ( Yu-sung Cho ),송형근 ( Hyeong-geun Song ),이지훈 ( Ji-hoon Lee ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

Feammox [anaerobic ammonium oxidation coupled to iron(III) reduction] has been known recently as a newly discovered nitrogen cycling process and contributes to nitrogen loss in various environments such as terrestrial and aquatic ecosystem. In this study, we intended to acquire clues for potential anammox and/or feammox activities from paddy soils by analyzing anammox and Fe(III) reduction-relevant genes, microbial communities, and geochemical parameters important to anammox. Rice paddy soil samples were collected from 4 depths using a soil sampling hand auger. In the deepest soils of L4 (41.5-59.5 cm), hydrochloric acid (0.5 N) extractable Fe(II) was found to be highest among the 4 depths, indicating formation of anaerobic condition. Nitrate was not detected from all the depths, suggesting that denitrification was possibly spread throughout the studied depth. Quantitative PCR on hzsA gene and mtrA gene showed that abundance of Fe(II) reduction-related mtrA gene increased along with the soil depth and the relatively high hzsA gene ratio versus 16S rRNA gene was correlated with the low concentration of NH₄ ⁺ in L3 soils, indicating possible anammox activity. Amplicon sequencing analysis using` Illumina iSeq 100 on v4 region of 16S rRNA gene indicated that relatively higher abundance of Planctomycetes phylum in L4 than other depths. From the analytical results, it seems that there are clues for anammox and/or feammox reactions in rice paddy soils, and there needs to be further investigation.

전력설비 절연저항과 코로나 특성 분석

조용상(Yong-Sang Cho),박태성(Tae-Seong Park),송규소(Gyu-So Song),최유성(Yu-Seong Choi) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

최근 송배전선로 정전발생 건수는 감소추세를 보이고 있으나, 애자고장에 의한 정전 발생건수는 증가하는 경향이다. 본 연구에서는 애자의 관리를 효율적으로 하기 위한 방법의 제시를 위해 해안 및 내륙지역에서 수거한 배전용 애자에 대하여 현장 환경조사를 거쳐 부착된 화학성분을 정밀 분석하고 분석된 화학성분을 토대로 절연저항을 측정 하였다. 측정된 절연저항과 코로나 발생의 관계를 규명하기 위하여 코로나 검출기를 활용하여 시험을 수행하였고 절연저항의 정도와 코로나 발생과의 정량적 연관성을 입증하였다.

가시광반응을 이용한 고효율 항균에어필터 연구

정상빈(Sang Bin Jeong),고현식(Hyun Sik Ko),조유성(Yu Sung Cho),정재희(Jae Hee Jung) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

원예작물의 식물병에 의한 근권 미생물 군집의 변화

송형근 ( Hyeong-geun Song ),조유성 ( Yu-sung Cho ),양현주 ( Hyun-joo Yang ),서민경 ( Min-kyoung Seo ),이지훈 ( Ji-hoon Lee ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

It is well known that the rhizosphere microbial communities are closely associated with plant roots. The rhizosphere microbiota can be harmful or beneficial to the host plants. In this study, to know whether pathogen-caused plant diseases would lead changes of rhizosphere microbiota or not, pathogenic bacteria were added to the plants through leaf stomata and the soils to induce the diseases and the rhizosphere microbial communities were analyzed using multiplex sequencing. The plant pathogen Xanthomonas euvesicatoria 173-1 causing bacterial spots was applied to Korean chili peppers (Capsicum annuum) and the plant pathogen Erwinia carotovora SCC1 causing bacterial soft rot was applied to Chinese cabbage (Brassica rapa). The pot soils were collected before and after the pathogen applications and disease occurrences and analyzed for v4 region of bacterial 16S rRNA gene using Illumina iSeq 100 system. In the bacterial spot disease peppers, soil bacterial diversity was larger than in the normal pepper soils in terms of both species richness and evenness. Although it was not easy to indicate the responsible taxa for the differentiation, the communities were found to have diverged in both the cases of the control and disease plants, supported by NMDS and PCoA analyses on distance metrics of the communities. From the Chinese cabbage soils, there was less differentiation of microbiota between the normal and disease plants, than in the pepper soils. In the further study, it would be also interesting to investigate the important factors for divergence of results between pepper and cabbage.

세균성 무름병에 의한 배추의 근권 미생물 변화 분석

송형근 ( Hyung-geun Song ),조유성 ( Yu-sung Cho ),양서연 ( Seo-yeon Yang ),조쉬알파나 ( Alpana Joshi ),이지훈 ( Ji-hoon Lee ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0

The rhizosphere known as microbial habitat is the area of root-adjacent soil that is directly affected by substances exuded from the roots, such as the root exudates. It has been known that plant diseases affect plants and the rhizosphere microbial community. The bacterial soft rot caused by Pectobacterium carotovorum (formerly Erwinia carotovora) is one of the most important diseases of Chinese cabbage (Brassica rapa L.). In this study, the Chinese cabbage was inoculated by P. carotovorum SCC1 to induce bacterial soft rot. And the rhizosphere soil was analyzed to evaluate changes in the rhizosphere microbial community using Illumina iSeq 100 platform. The typical symptoms of soft rot in the disease-induced group (BRD) were detected. From the microbiome analysis, Proteobacteria, Actinobacteria, and Planctomycetes were the dominant phyla in all the samples. Also, the class Clostridia which was known to be related to the P. carotovorum was found in BRD3. Alpha-diversity showed no significant difference between control and disease groups. Also, in beta-diversity analysis, there were no significant differences between the two groups, but we found that one of the disease samples, BRD3 exhibited dissimilarity with other samples in PCoA and NMDS analyses based on Yue & Clayton distance matrices. We presumed that the rhizosphere microbial community was changed due to the plant’s soft rot disease. Collectively from the results, this study showed a significant ecological relationship between host plants’ disease and rhizosphere bacterial community.

세균성 점무늬병에 의한 고추의 근권 미생물 변화 분석

송형근 ( Hyung-geun Song ),조유성 ( Yu-sung Cho ),양서연 ( Seo-yeon Yang ),조쉬알파나 ( Alpana Joshi ),이지훈 ( Ji-hoon Lee ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0

Plants may change rhizosphere microbiota in response to pathogen infection, and the rhizosphere microbial communities are closely associated with plant roots. The change of rhizosphere microbial community can be beneficial to the host plants. The ‘cry for help’ hypothesis is that when a plant is invaded by a pathogen, it changes root exudate and affects the microbial community. In this study, a plant pathogenic bacterium (Xanthomonas euvesicatoria) was inoculated in soil and red peppers (Capsicum annuum L.) to induce bacterial spot disease. The rhizosphere soil was collected after 53 days of cultivation and V4 region of bacterial 16S rRNA gene of rhizosphere soil was analyzed using Illumina iSeq 100 system. Analysis of the rhizosphere microbial communities was conducted using Mothur. Bacterial alpha diversity of rhizosphere soil of bacterial spot disease-pepper was significantly smaller than the normal pepper soils. Also, the separation of bacterial communities between control and disease plants was observed through NMDS, PCoA, and LefSe analyses. These results provided ecological insight into the relationship between plant disease and the rhizosphere microbiota of pepper and represented the rhizosphere microbial flora of pepper was altered by bacterial spot disease.

레이저 가공 시 발생하는 나노입자에 대한 노출

고현식(Hyun Sik Ko),정상빈(Sang Bin Jeong),조유성(Yu Sung Cho),정재희(Jae Hee Jung) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

염내성 세균에 의한 보리의 염 스트레스 내성 촉진

이슬 ( Seul Lee ),( Anamika Khanal ),( Kathyleen Nogrado ),송형근 ( Hyung-geun Song ),조유성 ( Yu-sung Cho ),이지훈 ( Ji-hoon Lee ) 한국환경농학회 2021 한국환경농학회지 Vol.40 No.4

BACKGROUND: Salinity is one of the major limiting factors in agriculture that affect the growth and productivity of crops. It is economically difficult to artificially purify the soil affected by salt. Therefore, the use of plant growth-promoting bacteria (PGPB) in an effort to reduce stress caused by salt is emerging as a cost-effective and environment-friendly method. In this study, the purpose was to isolate the salt-tolerant bacteria from the rhizosphere soil and identify their ability to promote plant growth under salt stress condition. METHODS AND RESULTS: The isolates KST-1, KST-2, AST-3, and AST-4 that showed plant growth-promoting activity for barley in salt conditions were close to Bacillus cereus (KST-1, KST-2, and AST-4) and Bacillus thuringiensis (AST-3) and showed high salt tolerance up to 7% of additional NaCl to the media. When inoculated to barley, the strains had only minor effect on the length of the barley. However, the concentrations of chlorophyll in the barley leaves were found to be higher from the bacteria-inoculated pots than those from the uninoculated control. In particular, the chlorophyll concentration in Bacillus cereus AST-4 experiment was 5.45 times higher than that of the uninoculated control under the same experimental condition. CONCLUSION(S): The isolated salt-tolerant bacteria were found to influence on chlorophyll concentration of the barley. As represented by the strain AST-4, microbes may suggest a cost-effective and environmentally benign method to alleviate salt stress of crops cultivated in salt-accumulated soils such as reclaimed lands.