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Kim Ah-Ra,Minn Dohsik,Kim Su Hwan,Do Hyeon-Nam,Kim Byoungguk,Choi Young Sill,Kim Dong-Hyun,Oh Eun-Jee,Oh Kyungwon,Kwon Donghyok,권준욱,Kim Sung Soon,Lee June-Woo 한국역학회 2022 Epidemiology and Health Vol.44 No.-
OBJECTIVES: The Korea National Health and Nutrition Examination Survey (KNHANES) is a nationwide cross-sectional surveillance system that assesses the health and nutritional status of the Korean population. To evaluate the occurrence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in the community, we investigated the prevalence of antiSARS-CoV-2 antibodies in the sera of KNHANES participants. METHODS: Subjects were recruited between April 24 and December 12, 2020. In total, 5,284 subjects aged 10-90 years from 17 regions participated. SARS-CoV-2 antibodies were screened using the Elecsys Anti-SARS-CoV-2 assay. Positive samples were verified using 4 different SARS-CoV-2 antibody assays and the plaque reduction neutralizing test. The final seropositivity criteria were a positive screening test and at least 1 positive result from the 5 additional tests. RESULTS: Almost half (49.2%; 2,600/5,284) of participants were from metropolitan areas, 48.9% were middle-aged (40-69 years), and 20.5% were in their 20s or younger. The seropositivity rate was 0.09% (5/5,284). Three of the 5 antibody-positive subjects had a history of infection, of whom 2 were infected abroad and 1 was infected in a local cluster outbreak. CONCLUSIONS: The low SARS-CoV-2 antibody seroprevalence in Korea indicates that there have been few coronavirus disease 2019 (COVID-19) cases due to successful COVID-19 management measures (e.g., diagnostic tests for overseas arrivals, national social distancing, and strict quarantine measures). Moreover, asymptomatic infections were uncommon due to active polymerase chain reaction testing. However, hidden infections may exist in the community, requiring the continuation of quarantine and vaccination measures.
어병세균 Edwardsiella tarda에 대한 한약재 추출물의 항균활성
김아라 ( Ah Ra Kim ),김도균 ( Do Kyun Kim ),변태환 ( Tea Hwan Byun ),조은지 ( Eun Jee Jo ),이은우 ( Eun Woo Lee ),권현주 ( Hyun Ju Kwon ),김병우 ( Byung Woo Kim ),김태훈 ( Tae Hoon Kim ),이경본 ( Kyung Bon Lee ),김영만 ( Young Man 한국식품저장유통학회(구 한국농산물저장유통학회) 2011 한국식품저장유통학회지 Vol.18 No.1
The methanol extracts of 19 commercial herb medicines was analyzed to antibacterial activities against Edwardsiella tarda, causing several fish diseases. Rhus javanica showed most strong antibacterial activity against E. tarda and Escherichia coli. Methanol extract of R. javanica was further extracted using several organic solvents having different polarity. Extract from ethyl acetate fraction showed strong activity against E. tarda as well as E. coli. Minimal inhibitory concentration, MIC of R. javanica extract was measured and resulted showing 64 ㎍/㎖ for E. tarda and 256 ㎍/㎖ for E. coli. It is needed that, from these results, further purification and isolation of reposible compound of these activities and further study on the synergy effect using combination with antibiotics against pathogenic bacteria.
Wafer-Scale Integration of Highly Uniform and Scalable MoS<sub>2</sub> Transistors
Kim, Yonghun,Kim, Ah Ra,Zhao, Guoqing,Choi, Sun Young,Kang, Soo Cheol,Lim, Sung Kwan,Lee, Kang Eun,Park, Jucheol,Lee, Byoung Hun,Hahm, Myung Gwan,Kim, Dong-Ho,Yun, Jungheum,Lee, Kyu Hwan,Cho, Byungjin American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.42
<P>Molybdenum disulfide with atomic-scale flatness has application potential in high-speed and low-power logic devices owing to its scalability and intrinsic high mobility. However, to realize viable technologies based on two-dimensional materials, techniques that enable their large-area growth with high quality and uniformity on wafer cale is a prerequisite. Here, we provide a route toward highly uniform growth of a wafer-scale, four-layered MoS2 film on a 2 in. substrate via a sequential process consisting of the deposition of a molybdenum trioxide precursor film by sputtering followed by postsulfurization using a chemical vapor deposition process. Spatial spectroscopic analyses by Raman and PL mapping validated that the as-synthesized MoS2 thin films exhibit high uniformity on a 2 in. sapphire substrate. The highly uniform MoS2 layers allow a successful integration of devices based on 4200 MoS2 transistor arrays with a yield of 95% because of their extreme homogeneity on Si wafers. Moreover, a pulse electrical measurement technique enabled investigation of the inherent physical properties of the atomically thin MoS2 layers by minimizing the charge-trapping effect. Such a facile synthesis method can be possibly applied to other 2D transition metal dichalcogenides to ultimately realize the chip integration of device architectures with all 2D-layered building blocks.</P>
Potter syndrome - Bilateral renal agenesis with club foot : An autopsy case
( Ah-ra Lee ),( Sung-eun Park ),( Ji-young Kim ),( Young-shin Han ),( In-cheol Jung ),( Su-mi Kim ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Potter's syndrome is a rare condition occurring at a frequency of 1:2000 to 1:5000 fetuses. Here we present a case of Potter syndrome with bilateral renal agenesis with low-set abnormal ears, right ventricular hypertrophy with club foot diagnosed on autopsy. A 28 year-old primi-para woman was referred from local clinic at pregnancy 20weeks and 6days for decreased amniotic fluid index. She had no underlying disease or previous operation history except laparoscopic ovarian cystectomy done three years ago. She had never smoked cigarettes and exposed to drinking alcohols during pregnancy. Under transabdominal sonography, the amniotic fluid was nearly absent. On the day of arrival, amniocentesis and 300cc of amnioinfusion was done. The amniotic fluid normalized after amniotic infusion. Chromosomal study was performed by using Giemsa-Trypsin-Leishman Banding technique, it is confirmed to have no numerical or structural chromosome abnormalities under the microscope of 550 resolving power We performed target sonography. Estimated fetal body weight was approximately 323g at the top 20 percentile on the graph. Under doppler sonography, bladder filling and renal arteries were not visible. Lying down adrenal sign with empty renal fossa and right ventricular hypertrophy was seen. The chest was 19weeks sized suggesting pulmonary hypoplasia. For religious reason, she decided to continue pregnancy. One week later, she admitted via emergency department due to labor pain with amniotic membrane rupture. A 350gram weighted stillborn male baby was delivered by spontaneous vaginal delivery. < Autopsy finding > The stillborn baby had no kidney, ureter, bladder and showed low-set ears, suppressed mandible and club foot. When the antenatal sonography shows severely decreased amniotic fluid with intact amnion, we have to suspect urinary anomaly. If severe oligohydramnios, non-visualization of the bladder and empty renal fossa is seen through sonography, it reflects bilateral renal agenesis.
Kim, Yonghun,Kim, Ah Ra,Yang, Jin Ho,Chang, Kyoung Eun,Kwon, Jung-Dae,Choi, Sun Young,Park, Jucheol,Lee, Kang Eun,Kim, Dong-Ho,Choi, Sung Mook,Lee, Kyu Hwan,Lee, Byoung Hun,Hahm, Myung Gwan,Cho, Byung American Chemical Society 2016 NANO LETTERS Vol.16 No.9
<P>The long-term stability and superior device reliability through the use of delicately designed metal contacts with two-dimensional (2D) atomic-scale semiconductors are considered one of the critical issues related to practical 2D-based electronic components. Here, we investigate the origin of the improved contact properties of alloyed 2D metal semiconductor heterojunctions. 2D WSe2-based transistors with mixed transition layers containing van der Waals (M-vdW, NbSe2/WxNb1-xSe2/WSe2) junctions realize atomically sharp, interfaces, exhibiting long hot-carrier. :lifetimes of approximately 75,296 s (78 times longer than that of metal semiconductor, Pd/WSe2 junctions). Such dramatic lifetime enhancement in M-vdW-junctioned devices is attributed to the synergistic effects arising from the significant reduction in the number of defects and the Schottky barrier lowering at the interface. Formation of a controllable mixed-composition alloyed layer on the 2D active channel would be a breakthrough approach to maximize the electrical reliability of 2D nanomaterial-based electronic applications.</P>