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장운용(Un-Yong Jang),정광석(Kwang-Seok Jung),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),박성주(Sung-Ju Park) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presented surge protective method and devices for shipboard electrical and electronics devices. Parallel type surge protective devices (SPD) for the 440 [V] and a series type SPD for the 220 [V] rated voltage were designed and fabricated. The performance were evaluated by an un-powered test which applies the 8/20 [㎲] surge current Lip to 10 [㎄]. The maximum clamping voltage of the parallel and the series type SPD were 1,032 [V] and 875 [V], respectively.
Park Hye Won,Choi Sang-Un,Baek Nam-In,Kim Sung-Hoon,Eun Jae Soon,Yang Jae Heon,Kim Dae Keun The Pharmaceutical Society of Korea 2006 Archives of Pharmacal Research Vol.29 No.2
A new compound 2 and two known guaiane-type sesquiterpenoids were isolated from the methylene chloride-soluble fraction of the methanolic extract of the fruits of Torilis japonica (Umbelliferae) through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as torilin (1), 11-acetoxy-8-angeloyloxy-$1{\beta}$-hydroxy-4-guaien-3-one ($1{\beta}$-hydroxytorilin, 2), and 11-acetoxy-8-angeloyloxy-$1{\alpha}$-hydroxy-4-guaien-3-one ($1{\alpha}$-hydroxytorilin, 3) by spectroscopic analysis. Compounds 1-3 exhibited cytotoxicity against human A549, SK-OV-3, SK-MEL-2, and HCT15 tumor cells.
Fungal Endophytes from Three Cultivars of Panax ginseng Meyer Cultivated in Korea
Sang Un Park,Hyoun-Sub Lim,Kee-Choon Park,Young-Hwan Park,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.1
In order to investigate the diversity of endophytes, fungal endophytes in Panax ginseng Meyer cultivated in Korea were isolated and identifi ed using internal transcribed spacer (ITS) sequences of ribosomal DNA. Three cultivars of 3-year-old ginseng roots (Chunpoong, Yunpoong, and Gumpoong) were used to isolate fungal endophytes. Surface sterilized ginseng roots were placed on potato dextrose agar plates supplemented with ampicilin and streptomycin to inhibit bacterial growth. Overall, 38 fungal endophytes were isolated from 12 ginseng roots. According to the sequence analysis of the ITS1-5.8S-ITS2, 38 fungal isolates were classifi ed into 4 different fungal species, which were Phoma radicina, Fusarium oxysporum, Setophoma terrestris and Ascomycota sp. 2-RNK. The most dominant fungal endophyte was P. radicina in 3 cultivars. The percentage of dominant endophytes of P. radicina was 65.8%. The percentage of colonization frequency of P. radicina was 80%, 52.9%, and 75% in Chunpoong, Yunpoong, and Gumpoong, respectively. The second most dominant fungal endophyte was F. oxysporum. The diversity of the fungal endophytes was low and no ginseng cultivar specifi city among endophytes was detected in this study. The identifi ed endophytes can be potential fungi for the production of bioactive compounds and control against ginseng pathogens.
Sang Un Park,Deok-Jong Ahn,Hyeon-Jeong Jeon,Tae Ryong Kwon,Hyoun-Sub Lim,Bo-Seong Choi,Kwang-Hyun Baek,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.2
An light-emitting diode (LED)-based light source was used as a monochromatic light source to determine the responses of raw ginseng roots (Panax ginseng Meyer) to specifi c emission spectra with respect to the production of ginsenosides. The ginsenoside content in the ginseng roots changed in response to the LED light treatments at 25℃ relative to the levels in the control roots that were treated in the dark or at 4℃ for 7 d. Ginseng roots were exposed to LEDs with four different peak emission wavelengths, 380, 450, 470, and 660 ㎚, in closed compartments. Compared with the control 4℃-treated roots, roots that were treated with 450 and 470 ㎚ light showed a signifi cantly increased production of ginsenosides (p<0.05), with increases of 64.9% and 74.1%, respectively. The contents of the ginsenosides Rb2, Rc, and Rg₁ were signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples. The ratio of protopanaxadiol ginsenosides (Rb₁, Rb₂, Rc, and Rd) to protopanaxatriol ginsenosides (Rg₁, Rg₂, Re, and Rf) was signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples than in the control 4℃-treated roots. This is the fi rst report that demonstrates the increase and conversion of ginsenosides in raw ginseng roots in response to exposure to LED light.
( Un Taek Hwang ),( Junsoo Bae ),( Taekyeong Lee ),( Sung-yun Hwang ),( Jong-chan Kim ),( Jinseok Park ),( In-gyu Choi ),( Hyo Won Kwak ),( Sung-wook Hwang ),( Hwanmyeong Yeo ) 한국목재공학회 2021 목재공학 Vol.49 No.3
In this paper, we investigated the carbonization characteristics of lignin hydrochar prepared by hydrothermal carbonization and established a model for predicting the carbonization degree using near-infrared spectroscopy and partial least squares regression. The carbon content of the hydrothermally carbonized lignin at the temperature of 200 ℃ was higher by approximately 3 wt% than that of the untreated sample, and the carbon content tended to gradually increase as the heating time increased. Hydrothermal carbonization made lignin more carbon-intensive and more homogeneous by eliminating the microparticles. The discriminant and predictive models using near-infrared spectroscopy and partial least squares regression approppriately determined whether hydrothermal carbonization has been applied and predicted the carbon content of hydrothermal carbonized lignin with high accuracy. In this study, we confirmed that we can quickly and nondestructively predict the carbonization characteristics of lignin hydrochar manufactured by hydrothermal carbonization using a partial least squares regression model combined with near-infrared spectroscopy. 본 논문에서는 열수 탄화(hydrothermal carbonization)에 의해 제조된 리그닌 하이드로차의 탄화 특성을 조사하였고, 근적외선 분광법과 부분 최소 제곱(partial least squares) 회귀를 이용하여 탄화 거동을 예측하기 위한 모델을 수립하였다. 온도 200℃에서 열수 탄화된 리그닌의 탄소 함량은 무처리 시료 보다 약 3 wt% 높았으며 가열 시간이 증가할수록 탄소 함량도 서서히 증가하는 경향이 나타났다. 열수 탄화는 리그닌을 더욱 탄소 집약적으로 변화시키고 마이크로 파티클을 제거하여 더욱 균질한 특성을 부여하였다. 근적외선 분광법과 부분 최소 제곱 회귀를 이용한 판별 및 예측 모델은 수열 탄화의 적용 여부를 완벽히 구분했으며 높은 정확도로 열수 탄화 리그닌의 탄소 함량을 예측하였다. 본 연구로부터 근적외선 분광법과 결합된 부분 최소 제곱 회귀 모델을 이용하여 열수 탄화에 의해 제조된 리그닌 하이드로차의 탄화 특성을 빠르고 비파괴적으로 예측할 수 있다는 것이 확인되었다.
The Application of Nondestructive Methods for Degradation Evaluation of Modified 9Cr-1Mo Steel
Park, Jong Seo,Baek, Un Bong,Nahm, Seung Hoon,Han, Sang In,Choi, Song Chun Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>The nondestructive evaluation technique for the material degradation is necessary because of the limitation of conventional destructive methods. In this study, an ultrasonic velocity measurement method was attempted for the estimation of the creep damage of degraded modified 9Cr-1Mo steel. The specimens with seven different kinds of aging periods were prepared by an isothermal heat treatment at 690 . The ultrasonic velocity was measured by an immersion method. The correlation between the measured ultrasonic velocity and tensile properties were studied. The ultrasonic velocity has an declining tendency with the increase of heat treatment time. A correlation between the ultrasonic velocity and aging parameter were established, which allows one to estimate the material degradation of modified 9Cr-1Mo steel.</P>
Park Woo Tae,Yeo Sun Kyung,Sathasivam Ramaraj,Park Jong Seok,Kim Jae Kwang,Park Sang Un 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.3
Agsatache rugosa (Korean mint), belongs to the mint family and it has various medicinal properties. In addition, it has several valuable compounds such as monoterpenes and phenylpropanoid compounds. Amongst these, two compounds viz., rosmarinic acid (RA), and tilianin are well-known natural compounds that have numerous pharmacological properties. The phenylpropanoid biosynthetic gene expression under stress conditions and the subsequent accumulation of phenylpropanoid content has not been extensively studied in Korean mint. Here, we investigated the effect of light-emitting diodes (LEDs) on the expression levels of phenylpropanoid biosynthetic pathway genes and the accumulation of phenylpropanoid compounds such as RA and tilianin in A. rugosa. Real-time PCR analysis showed that the phenylpropanoid pathway genes responded to the LED lights. The transcript levels of downstream genes (C4H, CHS, CHI, and RAS) were comparatively higher than those of upstream genes (PAL, TAT , and HPPR). In addition, HPLC analysis showed that the content of RA and tilianin were significantly higher in plants cultivated under white light than those grown under red, blue, green, and orange lights. The RA and tilianin content were the highest in the plantlets after three weeks of exposure to white light. These results suggested that white LED lights significantly enhanced the accumulation of phenylpropanoid compounds in A. rugosa.