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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.
Antimicrobial Effect of Phytochemicals to Listeria monocytogenes Isolated from Slaughterhouses
Kim, Hyeji,Oh, Hyemin,Lee, Heeyoung,Kim, Sejeong,Ha, Jimyeong,Lee, Jeeyeon,Choi, Yukyung,Lee, Yewon,Kim, Yujin,Yoon, Yohan,Lee, Soomin The Korean Society of Food Hygiene and Safety 2018 한국식품위생안전성학회지 Vol.33 No.4
본 연구에서는 도축장에서 분리된 Listeria monocytogenes를 저해할 수 있는 식물성 항균 물질을 탐색하고, 각 항균 물질의 최소살균농도(MBC)를 확인하였다. 잠재적인 항균 물질로 자몽종자 추출물, 감귤류 추출물, 생강 추출물, 배 추출물, 매실 농축액, 도라지 추출물, 대추 추출물, 오미자 추출물을 선정하였고, 대상 균주로는 국내 도축장에서 분리한 15 개의 L. monocytogenes 균주를 혼합하여 사용하였다. MBC 확인 결과, 최대 $4.0{\mu}g/mL$ 농도의 생강 추출물, 배 추출물, 매실 농축액, 도라지 추출물, 대추 추출물, 오미자 추출물은 고농도의 L. monocytogenes (7 Log CFU/mL)에 대해 균 저해 효과가 전혀 나타나지 않았다. 반면, 7 Log CFU/mL의 L. monocytogenes에 대한 자몽종자 추출물과 감귤류 추출물의 MBC는 $0.002{\mu}g/mL$인 것으로 확인되었다. 3 Log CFU/mL의 L. monocytogenes에 대한 MBC를 시험해 본 결과, 자몽종자 추출물과 감귤류 추출물의 MBC는 $0.001{\mu}g/mL$로 나타났다. 이상의 결과로 볼 때 자몽종자 추출물과 감귤류 추출물은 L. monocytogenes를 제어하기 위해 적용될 수 있을 것으로 판단된다. The objective of this study was to investigate the inhibitory effect of natural antimicrobials on Listeria monocytogenes isolated from Korean slaughterhouses. A mixture of 15 strains of L. monocytogenes at low (3 Log CFU/mL) or high (7 Log CFU/mL) concentration was exposed to various extracts (grapefruit seed extract, citrus fruit extract, ginger extract, pear extract, Japanese apricot concentrate, balloon flower extract, jujube extract, and omija extract) at $0.001-4.0{\mu}g/mL$. Ginger extract, pear extract, Japanese apricot concentrate, balloon flower extract, jujube extract, or omija extract showed no antimicrobial effects on high-concentration of L. monocytogenes (7 Log CFU/mL). However, grapefruit seed extract and citrus fruit extract showed antibacterial effects against L. monocytogenes at 3 and 7 Log CFU/mL with MBCs of 0.001 and $0.002{\mu}g/mL$, respectively. These results indicate that grapefruit seed extract and citrus fruits extract can be used to control L. monocytogenes as natural antimicrobials.
Kim, Yong-Sam,Kang, Hye-Yeon,Kim, Jin-Young,Oh, Sejeong,Kim, Cheorl-Ho,Ryu, Chun Jeih,Miyoshi, Eiji,Taniguchi, Naoyuki,Ko, Jeong Heon WILEY-VCH 2006 Proteomics Vol. No.
<P>To gain a better understanding of the mechanism underlying colon cancer and to search for potential markers of colon cancer prognosis, a comparative proteomic analysis of colon cancer WiDr cells was conducted using 2-DE and lectin blot, followed by identification based on ESI-MS. Through these approaches 14 proteins were identified as candidate target proteins for N-acetylglucosaminyl transferase V (GnT-V) that would be expected to be implicated in the progression of colon cancer. We selected protein tyrosine phosphatase kappa (PTPκ) as a model protein to validate this approach to the discovery of novel biomarkers in colon cancer. PTPκ underwent an aberrant glycosylation in GnT-V-overexpressing WiDr cells, and the aberrantly glycosylated PTPκ was vulnerable to proteolytic cleavage. The enhanced cleavage of PTPκ in GnT-V-overexpressing cells was responsible for the mitigation of the homophilic binding capacity, resulting in an increase in cancer cell migration.</P>