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Flexible thin-film GaAs solar cells with rear micro-pattern
Jang Yujeong,Yun Yeojun,Moon Sunghyun,Lee Minhyung,Lee Jaejin 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.8
Current thin-film GaAs solar cells have a planar resar ohmic contact structure, which might be related to losses due to the photon absorption in the highly doped contact layer. Reducing the rear contact ratio can improve photon absorption through the enhanced back reflection. In this study, by etching the rear p-GaAs contact layer with metal-assisted chemical etching, the micropillar structures consisting of square patterns were formed on the GaAs solar cells, which led to improved reflection and the cell performance. We compared the current density, reflectance, and external quantum efficiency of the solar cells according to the pattern size. The power conversion efficiency was improved from 10.67 to 11.21% for the GaAs singlejunction solar cell as compared to that with a planar surface under AM 1.5G illumination.
Compact Slot Antenna Integrated with a Photovoltaic Cell
Ahmed Ali,Heesu Wang,Yeojun Yun,Jaejin Lee,Ikmo Park 한국전자파학회JEES 2020 Journal of Electromagnetic Engineering and Science Vol.20 No.4
This paper presents a compact low-profile slot antenna integrated with a photovoltaic cell. The photovoltaic cell consists of a top metal grid, gallium arsenide substrate, and metallic bottom contact. The metallic bottom contact was used as a ground plane where the slot was etched for resonance. A second substrate was placed under the ground plane, and a 50 Ω microstrip line was printed on its bottom side to excite the slot. A chip inductor was used as a radio frequency (RF) choke in the alternating current blocking circuit to suppress RF current leakage towards the photovoltaic cell. Hence, the proposed antenna has a unique feature of functioning simultaneously as a photovoltaic cell and an antenna. The overall dimensions--25 mm × 31.75 mm × 0.893 mm (0.48o × 0.61o × 0.017o at 5.77 GHz)--of the photovoltaic cell-integrated slot antenna structure can be used effectively with Internet of Things devices.
Correlation between gut microbiota and personality in adults: A cross-sectional study
Kim, Han-Na,Yun, Yeojun,Ryu, Seungho,Chang, Yoosoo,Kwon, Min-Jung,Cho, Juhee,Shin, Hocheol,Kim, Hyung-Lae Elsevier 2018 Brain, behavior, and immunity Vol.69 No.-
<P><B>Abstract</B></P> <P>Personality affects fundamental behavior patterns and has been related with health outcomes and mental disorders. Recent evidence has emerged supporting a relationship between the microbiota and behavior, referred to as brain-gut relationships. Here, we first report correlations between personality traits and gut microbiota. This research was performed using the Revised NEO Personality Inventory and the sequencing data of the 16S rRNA gene in 672 adults. The diversity and the composition of the human gut microbiota exhibited significant difference when stratified by personality traits. We found that personality traits were significantly correlated with diversity of gut microbiota, while their differences were extremely subtle. High neuroticism and low conscientiousness groups were correlated with high abundance of Gammaproteobacteria and Proteobacteria, respectively when covariates, including age, sex, BMI and nutrient intake, were controlled. Additionally, high conscientiousness group also showed increased abundance of some universal butyrate-producing bacteria including Lachnospiraceae. This study was of observational and cross-sectional design and our findings must be further validated through metagenomic or metatranscriptomic methodologies, or metabolomics-based analyses. Our findings will contribute to elucidating potential links between the gut microbiota and personality, and provide useful insights toward developing and testing personality- and microbiota-based interventions for promoting health.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Personality traits were correlated with gut microbiota composition. </LI> <LI> Gammaproteobacteria was increased in high neuroticism group. </LI> <LI> Low conscientiousness group showed increased abundance of Proteobacteria. </LI> <LI> The low conscientiousness group showed decreased abundance of Lachnospiraceae. </LI> </UL> </P>
Endemic Severe Fever with Thrombocytopenia Syndrome, Vietnam
Tran, Xuan Chuong,Yun, Yeojun,Van An, Le,Kim, So-Hee,Thao, Nguyen T. Phuong,Man, Phan Kim C.,Yoo, Jeong Rae,Heo, Sang Taek,Cho, Nam-Hyuk,Lee, Keun Hwa U.S. Department of Health and Human Services * Cen 2019 Emerging Infectious Diseases Vol.25 No.5
Severe Fever with Thrombocytopenia Syndrome Virus Infection, South Korea, 2010
Kim, Young Ree,Yun, Yeojun,Bae, Seung Geon,Park, Dahee,Kim, Suhyun,Lee, Jae Myun,Cho, Nam-Hyuk,Kim, Yang Soo,Lee, Keun Hwa Centers for Disease Control and Prevention 2018 Emerging infectious diseases Vol.24 No.11
<P>Severe fever with thrombocytopenia syndrome (SFTS) was reported in China in 2009 and in South Korea in 2012. We found retrospective evidence of SFTS virus infection in South Korea in 2010, suggesting that infections in South Korea occurred before previously reported and were more concurrent with those in China.</P>
Kim, Jiyeon,Yoon, Yeojun,Yun, Seungho,Park, Gwan Soo,Lee, Hae June,Song, Kiwon Wiley Subscription Services, Inc., A Wiley Company 2012 BioElectroMagnetics Vol.33 No.5
<P><B>Abstract</B></P><P>The potential genotoxic effect of a time‐varying magnetic field (MF) on human cells was investigated. Upon continuous exposure of human primary fibroblast and cervical cancer cells to a 60 Hz MF at 7 mT for 10–60 min, no significant change in cell viability was observed. However, deoxyribonucleic acid (DNA) double‐strand breaks (DSBs) were detected, and the DNA damage checkpoint pathway was activated in these cells without programmed cell death (called apoptosis). The exposure of human cells to a 60 Hz MF did not induce intracellular reactive oxygen species (ROS) production, suggesting that the observed DNA DSBs are not directly caused by ROS. We also compared the position and time dependency of DNA DSBs with numerical simulation of MFs. The Lorentz force and eddy currents in these experiments were numerically calculated to investigate the influence of each factor on DNA DSBs. The DNA DSBs mainly occurred at the central region, where the MF was strongest, after a 30‐min exposure. After 90 min, however, the amount of DNA DSBs increased rapidly in the outer regions, where the eddy current and Lorentz force were strong. Bioelectromagnetics 33:383–393, 2012. © 2011 Wiley Periodicals, Inc.</P>