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Low-voltage-tunable nanobeam lasers immersed in liquid crystals.
Kim, Sejeong,Kim, Hwi-Min,Son, Jaehyun,Kim, Yun-Ho,Ok, Jong Min,Kim, Ki Soo,Jung, Hee-Tae,Min, Bumki,Lee, Yong-Hee Optical Society of America 2014 Optics express Vol.22 No.25
<P>A low-voltage-tunable one-dimensional nanobeam laser is realized by employing lithographically defined lateral electrodes. An InGaAsP nanobeam with a sub-micrometer width is transfer-printed in the middle of two electrodes using a polydimethylsiloxane stamp. Spectral tuning is achieved by controlling the molecular alignment of the surrounding liquid crystals (LCs). From μm-scale-gap structures, a total wavelength shift that exceed 6 nm is observed at a low voltage of less than 10 V. A measured spectral tuning rate of 0.87 nm/V, which is the largest value ever reported to our knowledge among LC-tuned photonic crystal lasers, was also noted.</P>
한국 여성의 비만과 체형인식왜곡에 따른 유방암 검진율 차이
김세정(Kim, Sejeong),김희승(Kim, Hee-Seung),김혜진(Kim, Hye-Jin) 기초간호학회 2018 Journal of korean biological nursing science Vol.20 No.3
Purpose: This study was performed to elucidate whether the obesity or body image is a barrier to breast screening compliance in Korean women. Methods: We included 54,017 women aged between 35 to 70 years from the Korea Community Health Survey (KCHS) 2014 dataset. To identify whether a mutual relationship exists between weight perceptions and breast cancer screening rates, the participants were divided into three groups according to the level of concordance between Body Mass Index (BMI) and a subjective body image. Descriptive analyses, a chi-square test, and multivariate logistic regression analyses were performed. Results: After covariate adjustment, the screening rate of the overweight group was 1.09 times higher than the normal weight group (odds ratio [OR], 1.09; confidence interval [CI], 0.00-0.16; p=.038) and the severe obesity group was 1.20 times lower (OR, 0.83; CI, -0.36-0.00; p=.047). Weight misperception also had a significant influence on breast cancer screening. Especially, The overweight distortion group was less likely to undergo breast cancer screening (OR, 0.93; CI, -0.15-0.00; p=.037). Conclusion: Obesity and weight misperceptions are associated with lower compliance with breast cancer screening guidelines.
Graphene-based crack lithography for high-throughput fabrication of terahertz metamaterials
Won, Sejeong,Jung, Hyun-June,Kim, Dasom,Lee, Sang-Hun,Van Lam, Do,Kim, Hyeon-Don,Kim, Kwang-Seop,Lee, Seung-Mo,Seo, Minah,Kim, Dai-Sik,Lee, Hak-Joo,Kim, Jae-Hyun Elsevier 2020 Carbon Vol.158 No.-
<P><B>Abstract</B></P> <P>Terahertz (THz) nanoantennas have significant potential for versatile applications in THz spectroscopy because of their capability for strong electromagnetic field localization. Electron-beam lithography or focused ion beam machining is typically employed to fabricate nanoantenna structures. These nanolithography methods present limitations in the widespread utilization of THz nanoantennas because of their high cost and low productivity. In this work, we proposed graphene-based crack lithography as a high throughput fabrication method for nanoantenna structures. A double-layer graphene interface was introduced to enable independent control of the nanoantenna dimensions and provide graphene-based nanoantenna structures. We analyzed the underlying mechanism of graphene-based cracking and developed an analytical model governing the geometric parameters of the fabricated nanostructures. As a vital application of the fabricated nanoantenna structures, we demonstrated the highly sensitive detection of <SMALL>D</SMALL>-Glucose molecules. Graphene-based crack lithography can provide a cost-effective method for generating nanoantenna structures with the desired characteristics and can accelerate the development of practical applications of electromagnetic metamaterials.</P> <P><B>Graphical abstract</B></P> <P>Nanoantennas of various materials with desired terahertz resonance characteristics can be readily manufactured on a large scale using the graphene-based crack lithography.</P> <P>[DISPLAY OMISSION]</P>
김창현(Chang-Hyun Kim),이상봉(Sang-Bong Lee),조경민(Kyungmin Jo),김상민(Sangmin Kim),원세정(Sejeong Won),김경식(Kyung-Shik Kim),김광섭(Kwang-Seop Kim),김재현(Jae-Hyun Kim),이학주(Hak-Joo Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this work, we investigated the effects of the number of graphene layer on the stretchability of graphene electrode. CVD?grown graphene was transferred onto a flexible transparent substrate through dry transfer process. Tensile tests for each specimen were carried out to investigate the electro-mechanical properties of graphene electrode with the number of graphene layer. During the tensile test, we measured the electrical resistance of graphene electrode and the load applied on the electrode simultaneously. The results show that stacking graphene sheets onto flexible substratesis effective to reduce the resistance change of graphene electrode
Preparation of GF37 for the improvement of respiratory inflammation
Ju Yeong So,Min Jung Kim,Go Woo Choi,You Jin Lee,Yun Ho Jo,Sejeong Kim,Danhui Kim,Sang Hun Lee,Een Yeong Park,Dae Seok Yoo,Jin Seong Kim,Sang Won Cho,Young Soo Kim,Hak Joo Choi,Mi Kyung Pyo 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Panax ginseng (PG) and Perilla frutesens (PF) leaves have antioxidant and anti-inflammatory action, which can alleviate various diseases caused by fine dust. Therefore, the purpose of this study is to find the optimal ratio of ginseng and perilla leaves to maximize the anti-inflammatory action. PG and PF were extracted three times for 6 h at 70℃ with 70% ethanol and concentrated in vacuum, respectively, and then powdered by spray dryer. PG:PF were each made at different ratios to make 9 samples; CHJ1 (1:9), CHJ2 (2:8), CHJ3 (3:7), CHJ4 (4:6), CHJ5 (5:5), CHJ6 (6:4), CHJ7 (7:3), CHJ8 (8:2), CHJ9 (9:1). Each sample was measured TNF-a, IL-6, and ROS against fine dust (PM10) using MH-S cells. Among the 9 mixed samples, CHJ2 and CHJ3 inhibited the inflammation and oxidative stress induced by fine dust the best. In a confirmation experiment comparing these samples with PG and PF samples, the CHJ2 sample was finally selected because it had the best anti-inflammatory and antioxidant effects at a low concentration. Finally, a CHJ2 sample in which PG and PF were mixed in a 3:7 ratio was selected as a material for improving respiratory inflammation, and was named GF37.
Sejeong Kim,Soomin Lee,Heeyoung Lee,Jimyeong Ha,Jeeyeon Lee,Yukyung Choi,Hyemin Oh,Joonbae Hong,Yohan Yoon,Kyoung-Hee,Choi 한국축산식품학회 2017 한국축산식품학회지 Vol.37 No.4
This study investigated bacterial growth-inhibitory effect of 69 therapeutic herbal plants extracts on 9 bacterial strains using a disc diffusion assay. Especially, the antimicrobial activity of Psoraleae semen, which showed different activity on pathogenic Gram-positive and Gram-negative bacteria, was evaluated by MIC (minimal inhibition concentration) and biofilm formation assay. The effect of Psoraleae semen extract on bacterial cell membranes was examined by measurement of protein leakage (optical density at 280 nm) and scanning electron microscope (SEM). No clear zone was formed on discs containing Gram-negative bacteria, but Gram-positive bacteria exhibited clear zones. The MICs of Psoraleae semen extract were 8 μg/mL for Streptococcus mutans, and 16 μg/mL for Enterococci and Staphylococcus aureus. In addition, biofilm formation was inhibited at concentration 8-16 μg/mL. Protein leakage values and SEM images revealed that cell membranes of Gram-positive bacteria were impaired following exposure to the extract. Further, the extract inhibited the growth of Listeria monocytogenes in sausages. These results indicate that Psoraleae semen extract could be utilized as a natural antimicrobial agent against Gram-positive bacteria.
Unidirectional Emission of a Site-Controlled Single Quantum Dot from a Pyramidal Structure
Kim, Sejeong,Gong, Su-Hyun,Cho, Jong-Hoi,Cho, Yong-Hoon American Chemical Society 2016 NANO LETTERS Vol.16 No.10
<P>Emission control of a quantum emitter made of semiconductor materials is of significance in various optical applications. Specifically, the realization of efficient quantum emitters is important because typical semiconductor quantum dots are associated with low extraction efficiency levels due to their high refractive index contrast. Here, we report bright and unidirectional emission from a site-controlled InGaN quantum dot formed on the apex of a silver-coated GaN nanopyrarniclal structure. We show that the majority of the extracted light from the quantum dot is guided toward the bottom of the pyramid with high directionality. We also demonstrate that nanopyramid structures can be detached from a substrate, thus demonstrating great potential of this structure in various applications. To clarify the directional radiation, the far-field radiation pattern is measured using Fourier microscopy. This scheme will pave the way toward the realization of a bright and unidirectional quantum emitter along with easy fabrication and large-area reproducibility.</P>
Kim, Yujin,Kim, Sejeong,Lee, Soomin,Ha, Jimyeong,Lee, Jeeyeon,Choi, Yukyung,Oh, Hyemin,Lee, Yewon,Oh, Nam-su,Yoon, Yohan,Lee, Heeyoung Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.9
Objective: The objective of this study was to evaluate the antimicrobial effects of fermented Maillard reaction products made by milk proteins (FMRPs) on Clostridium perfringens (C. perfringens), and to elucidate antimicrobial modes of FMRPs on the bacteria, using physiological and morphological analyses. Methods: Antimicrobial effects of FMRPs (whey protein plus galactose fermented by Lactobacillus rhamnosus [L. rhamnosus] 4B15 [Gal-4B15] or Lactobacillus gasseri 4M13 [Gal-4M13], and whey protein plus glucose fermented by L. rhamnosus 4B15 [Glc-4B15] or L. gasseri 4M13 [Glc-4M13]) on C. perfringens were tested by examining growth responses of the pathogen. Iron chelation activity analysis, propidium iodide uptake assay, and morphological analysis with field emission scanning electron microscope (FE-SEM) were conducted to elucidate the modes of antimicrobial activities of FMRPs. Results: When C. perfringens were exposed to the FMRPs, C. perfringens cell counts were decreased (p<0.05) by the all tested FMRPs; iron chelation activities by FMRPs, except for Glc-4M13. Propidium iodide uptake assay indicate that bacterial cellular damage increased in all FMRPs-treated C. perfringens, and it was observed by FE-SEM. Conclusion: These results indicate that the FMRPs can destroy C. perfringens by iron chelation and cell membrane damage. Thus, it could be used in dairy products, and controlling intestinal C. perfringens.