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안기홍,한재구,김옥태,조재한,An, Gi-Hong,Han, Jae-Gu,Kim, Ok-Tae,Cho, Jae-Han 한국버섯학회 2021 한국버섯학회지 Vol.19 No.1
국내 자생하는 야생버섯 추출물의 생리활성 성분을 평가하기 위하여 각지에서 수집된 야생버섯 70% 에탄올추출물에 대한 DPPH 라디컬 소거능, 총 폴리페놀 및 총 플라보노이드 함량, 철 환원 항산화능, 환원력의 항산화 활성, 아질산염 소거능 및 야생버섯의 건조시료를 이용하여 베타글루칸 함량을 분석하였다. 본 연구에서 수집된 10종의 야생버섯류 중에서 영지(OK1362) 에탄올추출물의 DPPH 라디컬 소거능(73.2%), 총 폴리페놀 함량(28.9 mg GAE/g) 및 총 플라보노이드 함량(10.0 mg QE/g)철 환원 항산화능(0.134), 환원력(0.155), 아질산염 소거능(56.3%)이 다른 버섯류에 비하여 유의적으로 가장 높았다. 그 이외에도 아까시흰구멍버섯(OK1360), 광대버섯속의 A. lanigera (OK1398), 졸각무당버섯(OK1406)이 높은 항산화능 및 아질산염 소거능을 가지고 있음을 확인하였다. 또한 베타글루칸 함량은 영지(OK1362)가 25.2%를 나타내며 가장 높았으며, 그 외에 구름버섯속의 T. lactinea (OK1457)가 24.5%로 높은 것으로 나타났다. 본 연구의 결과는 국내 자생하는 야생버섯류 중 새로운 천연물 유래 생리활성 물질을 탐색하기 위한 기초자료로서 활용 가능성을 기대한다. The aim of the study was to obtain the extracts of various native wild mushrooms and select the useful resources though biological activity evaluation. The anti-oxidant potential, nitrite scavenging activity, and -glucan content of wild mushrooms collected from Eumseong and Bonghwa in Korea were investigated. Based on the results of this study, Ganoderma lingzhi (OK1362) showed the highest DPPH radical scavenging activity (73.2%), ferric reducing anti-oxidant power (0.134), reducing power (0.155), nitrite scavenging activity (53.6%), total polyphenol content (28.9 mg GAE/g), flavonoid content (10.0 mg QE/g), and -glucan content (25.2%) when compared to other wild mushrooms sampled in this study. In addition, it was confirmed that Perenniporia fraxinea (OK1360), Amanita sp. (OK1398), and Russula sp. (OK1406) had relatively high anti-oxidant and nitrite scavenging potentials. In conclusion, our results can provide fundamental data for extracting beneficial compounds from wild mushrooms.
영어 Much of an N 구문에 대한 말뭉치 기반적 접근
김옥기(Ok gi Kim),김종복(Jong Bok Kim) 현대문법학회 2015 현대문법연구 Vol.86 No.-
Okgi Kim and Jong-Bok Kim. 2015. English much of an N Construction: A Corpus-based Approach. Studies in Modern Grammar 86, 47-70. English much of an N (henceforth, MOA) construction (e.g., It’s not much of a problem.) consists of quantifiers like much, more/less, enough, little and of-an-NP to intensify the indefinite singular degree NP. In this paper, we first review basic properties of the construction, focusing on the relation between the gradability of the NP and its predicativeness. In particular, after investigating authentic corpus data of the MOA, we provide a qualitative and quantitative analysis which allows a constraint-based approach in accounting for various syntactic as well as semantic properties of the construction.
A Study of Driver Brain Wave Characteristics through Changes in Headlamp Brightness
Kim, Hyun-Ji,Kim, Hyun-Jin,Kim, Gi-Hoon,Lee, Chang-Mo,Kim, Hoon,An, Ok-Hee The Korean Institute of IIIuminating and Electrica 2007 조명·전기설비학회논문지 Vol.21 No.9
In this study, tests of brain waves were carried out to investigate the physiological characteristics of drivers during a change of headlight brightness. The participants were 20 males in their 20s. Twenty-three different conditions combining the waveform of light, voltage, and alteration time were used. The measurement of brain waves was performed by an internationally standardized 10-20 method using LXE3232-RF. The results were as follows. 1. From the results of the brain wave map analysis, it was suggested that waveform A increases mental stress and waveform B affects mental and visual stress. The longer the stimulation time, the more stress level was detected. 2. The voltage alteration time of the B waveform should be kept to less than 1500msec, while the voltage should not fall below 11.5[V].
( Gi Hyun Kim ),( Jung Wha Chung ),( Jong Ho Lee ),( Kyeong Sam Ok ),( Eun Sun Jang ),( Jaihwan Kim ),( Cheol Min Shin ),( Young Soo Park ),( Jin Hyeok Hwang ),( Sook Hyang Jeong ),( Nayoung Kim ),( D 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.4
Background/Aims: Vitamin E improves the biochemical profiles and liver histology in nonalcoholic steatohepatitis, but the role of vitamin E is not clearly defined in the management of nonalcoholic fatty liver disease (NAFLD) which includes both simple steatosis and steatohepatitis. Co-morbid metabolic syndrome increases the probability of steatohepatitis in NAFLD. In this study, we aimed to determine the short-term effects of vitamin E and off-treatment durability of response in a propensity-score matched cohort of NAFLD patients with metabolic syndrome. Methods: A retrospective cohort was constructed by retrieving 526 consecutive NAFLD patients from the electronic medical record data warehouse of a tertiary referral hospital in South Korea. Among them, 335 patients (63.7%) had metabolic syndrome and were eligible for vitamin E therapy. In order to assess the effect of vitamin E, propensity score matching was used by matching covariates between control patients (n=250) and patients who received vitamin E (n=85). Results: The PS-matched vitamin E group (n=58) and control group (n=58) exhibited similar baseline metabolic profiles. After 6 months of vitamin E therapy, the mean ALT levels decreased significantly compared to PS-matched control (P<0.01). The changes in metabolic profiles (body weight, lipid and glucose levels) did not differ between control and vitamin E groups during the study period. Conclusions: Short-term vitamin E treatment significantly reduces ALT levels in NAFLD patients with metabolic syndrome, but metabolic profiles are not affected by vitamin E. (Clin Mol Hepatol 2015;21:379-386)
Allyl isothiocyanate reduces liver fibrosis by regulating Kupffer cell activation in rats
KIM, Jeongtae,BANG, Hyojin,AHN, Meejung,CHOI, Yuna,KIM, Gi Ok,SHIN, Taekyun The Japanese Society of Veterinary Science 2018 The Journal of veterinary medical science Vol.80 No.6
<P>Allyl isothiocyanate (AITC), a metabolite of the glucosinolate sinigrin, protects the liver of rats injured by carbon tetrachloride (CCl<SUB>4</SUB>). This study evaluated whether AITC reduces hepatic fibrosis in rats repetitively exposed to CCl<SUB>4</SUB>. Serum chemistry showed that AITC (doses of 5 and 50 mg) administered to rats exposed to CCl<SUB>4</SUB> significantly reduced the levels of alanine aminotransferase and aspartate aminotransferase activity that were elevated in CCl<SUB>4</SUB>-intoxicated rats. The connective tissue in AITC-treated rats was significantly reduced based on Sirius staining. In addition, Kupffer cell activation was significantly reduced in the AITC and CCl<SUB>4</SUB> co-treated groups. Collectively, this study suggests that AITC mitigates hepatic fibrosis in rats repetitively exposed to CCl<SUB>4</SUB> with concurrent regulation of Kupffer cell and monocyte activation.</P>
Reversible thixotropic gel electrolytes for safer and shape-versatile lithium-ion batteries
Kim, Ju Young,Shin, Dong Ok,Kim, Se-Hee,Lee, Jun Ho,Kim, Kwang Man,Oh, Jimin,Kim, Jumi,Lee, Myeong Ju,Yang, Yil-Suk,Lee, Sang-Young,Kim, Je Young,Lee, Young-Gi Elsevier 2018 Journal of Power Sources Vol.401 No.-
<P><B>Abstract</B></P> <P>All-solid-state lithium-ion batteries (ASLBs) are receiving considerable attention due to their safety superiority and high energy density (achieved by bipolar configuration). Inorganic solid electrolytes are explored as a key-enabling material of the ASLBs. However, their critical challenges, including grain boundary resistance, interfacial instability with electrode materials and complicated processability, remain yet unresolved. Here, we demonstrate a new class of gel electrolyte with reversible thixotropic transformation and abuse tolerance as an effective and scalable approach to address the aforementioned longstanding issues. The gel electrolyte consists of (fluoropolymer/cellulose derivative) matrix and liquid electrolyte. The reversible thixotropic transformation is realized via sol-gel transition based on Coulombic interaction of the polymer matrix with liquid electrolyte. This unusual rheological feature allows the gel electrolyte to be printed in various forms. In addition, the gel electrolyte shows low crystallinity, thus playing a viable role in delivering high ionic conductivity. Based on understanding of rheological/electrochemical characteristics of the gel electrolyte, we fabricate a form factor-free pouch-type cell assembled with the gel electrolyte using sequential screen-printing process. The resultant cell shows exceptional safety upon exposure to various harsh abuse conditions, along with decent electrochemical performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new class of gel electrolyte with reversible thixotropic property is demonstrated. </LI> <LI> The gel electrolyte consists of (fluoropolymer/cellulose derivatives) and liquid electrolyte. </LI> <LI> A form factor-free pouch-type cell can also be assembled with the gel electrolyte. </LI> </UL> </P>
Effect of the dielectric constant of a liquid electrolyte on lithium metal anodes
Kim, Ju Young,Shin, Dong Ok,Chang, Taeyong,Kim, Kwang Man,Jeong, Jiseon,Park, Joonam,Lee, Yong Min,Cho, Kuk Young,Phatak, Charudatta,Hong, Seungbum,Lee, Young-Gi Elsevier 2019 ELECTROCHIMICA ACTA Vol.300 No.-
<P><B>Abstract</B></P> <P>Lithium metal is considered one of the most promising anode materials for realizing high volumetric and gravimetric energy density, owing to the high specific capacity (∼3860 mAh g<SUP>−1</SUP>) and the low electrochemical potential of lithium (−3.04 V vs. the standard hydrogen electrode). However, undesirable dendritic lithium growth and corresponding instability of the solid electrolyte interphase prevent safe and long-term use of lithium metal anodes. This paper presents a simple electrolyte approach to enhance the performance of lithium metal batteries by tuning the dielectric constant of the liquid electrolyte. Electrolyte formulations are designed by changing the concentration of ethylene carbonate to have various dielectric constants. This study confirms that high ethylene carbonate content in a liquid electrolyte enhances the cycling performance of lithium metal batteries because the electric field intensity applied to the electrolyte is reduced in relation to the polarization of the electrolyte and thus allows smooth lithium plating and formation of a stable solid electrolyte interphase. We believe that this approach provides an important concept for electrolyte system design suitable to lithium metal batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electric field intensity for lithium plating is derived from interface analysis. </LI> <LI> Electrolytes with different dielectric constants are designed systematically. </LI> <LI> Confirmed enhanced cycling performance of lithium occurs with high EC content. </LI> </UL> </P>
Development of high-resolution active matrix spatial light modulator
Kim, Yong-Hae,Hwang, Chi-Young,Choi, Ji Hun,Pi, Jae-Eun,Yang, Jong-Heon,Cho, Seong-M.,Cheon, Sang-Hoon,Kim, Gi Heon,Choi, Kyunghee,Kim, Hee-Ok,Lee, Won-Jae,Kang, Han-Byeol,Hwang, Chi-Sun SPIE - International Society for Optical Engineeri 2018 Optical engineering Vol.57 No.6