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Tricyanoethylene(TCNE) 폴리이미드의 합성과 특성 및 그의 광전도성 연구
이명훈 ( Myong Hoon Lee ),손상원 ( Sang Won Son ),문명준 ( Myung Jun Moon ),이상남 ( Sang Nam Lee ) 한국화상학회 2001 한국화상학회지 Vol.7 No.2
내열성이 우수하고 전기광학 효과가 뛰어난 것으로 알려진 tricyanoethenyl(TCNE) 계 폴리이미드를 합성하여 구조, 열적성질, 발색단의 치환율을 ^1H-NMR, IR, DSC, TGA, UV/vis 분광법 등으로 확인하였다. 또한 전자주게 그룹이 있는 폴리이미드의 aniline의 para위치에 강한 전자 받게 그룹인 TCNE를 각각 0, 70, 100 % 치환시킴으로써 전자 받게와 전자 주게 그룹 사이의 분자간 interaction에 기인한 charge-transfer complex를 통한 광전도성 여부를 확인하기 위하여 제조된 고분자를 Mylar film에 도포한 후 광전하생성과 광전하수송을 PIDC (photo-induced discharge curve) 법으로 조사하였다. 제조된 고분자는 TCNE 치환도에 따라 광전도성을 나타내었다. A series of tricyanoethenyl polyimides haying high thermal resistance and electro-optic effect was synthesized. Their structure, thermal properties and degree of substitution of tricyanoethenyl group was characterized by ^1H-NMR, FT-IR, DSC, TGA and UV/vis spectroscopic methods. These polyimides contained aminophenyl moiety as in electron donor, and tricyanoethenyl moiety at para-position as an electron acceptor. The photoconductivity based on the charge-transfer complex between the electron donor and acceptor was investigated by a photo-induced discharge current (PIDC) method. The photoconductivity was measured for the double layered cell of polymer film in contact with a layer of various charge transporting materials coated on a Mylar film by photo-induced discharge curve method. Depending on the degree of tricyanoethenylation, the polymers showed good photocnductivity.
Lee, Myong-Min,Kim, Hyeong-Geug,Lee, Sung-Bae,Lee, Jin-Seok,Kim, Won-Yong,Choi, Seung-Hoon,Lee, Sam-Keun,Byun, Chang-Kyu,Hyun, Pung-Mi,Son, Chang-Gue Elsevier 2018 Phytomedicine Vol.41 No.-
<P>Conclusion: Our data present experimental evidence for the potential of CGplus as an herbal therapeutic against NAFLD and NASH. Its underlying mechanisms may involve the modulations of pro- and anti-inflammatory cytokines, but further study is required especially for the actions of CGplus on lipid metabolisms.</P>
Shin, Jang Woo,Lee, Myong Min,Son, Jin Young,Lee, Nam Heon,Cho, Chong Kwan,Chung, Won Kyu,Cho, Jung Hyo,Son, Chang Gue WJG Press 2008 WORLD JOURNAL OF GASTROENTEROLOGY Vol.14 No.15
<P>To evaluate the efficacy of Myelophil, an extract containing Astragali Radix and Salviae Radix, for reducing complications induced by 5-fluorouracil (5-FU) in a gastrointestinal cancer model.</P>
Carbon and nitrogen storage in an age-sequence of Pinus densiflora stands in Korea.
Noh, Nam-Jin,Son, Yowhan,Lee, Sue-Kyoung,Seo, Kyung-Won,Heo, Su-Jin,Yi, Myong-Jong,Park, Pil-Sun,Kim, Rae-Hyun,Son, Yeong-Mo,Lee, Kyeong-Hak Jointly published by Science China Press and Sprin 2010 Science China. Life sciences Vol.53 No.7
<P>The carbon (C) and nitrogen (N) storage capabilities of Pinus densiflora in six different stand ages (10, 27, 30, 32, 44, and 71 years old) were investigated in Korea. Thirty sample trees were destructively harvested and 12 were excavated. Samples from the above and belowground tree components, coarse woody debris (CWD), forest floor, and mineral soil (0-30 cm) were collected. Tree biomass was highest in the 71-year-old stand (202.8 t ha(-1)) and lowest in the 10-year-old stand (18.4 t ha(-1)). C and N storage in the mineral soil was higher in the 71-year-old stand than in the other stands, mainly due to higher soil C and N concentrations. Consequently, the total ecosystem C and N storage (tree+forest floor+CWD+soil) was positively correlated with stand age: increasing from a minimum in the 10 year old stand (18.8 t C ha(-1) and 1.3 t N ha(-1)) to a maximum in the 71-year-old stand (201.4 t C ha(-1) and 8.5 t N ha(-1)). The total ecosystem C storage showed a similar sigmoidal pattern to that of tree C storage as a function of the age-sequence, while N storage in the CWD, forest floor and mineral soil showed no significant temporal trends. Our results provide important insights that will increase our understanding of C and N storage in P. densiflora stands and our ability to predict changes according to stand age in the region.</P>
Difructose Dianhydrides(DFA IV)의 랫드를 이용한 단회 및 4주간 반복 경구투여 독성시험
이창우(Chang-Woo Lee),이명렬(Myong-Lyoll Lee),김환묵(Hwan-Mook Kim),윤원기(Won-Kee Yoon),김승환(Seung-Hwan Kim),손화영(Hwa-Young Son),김형진(Hyoung-Chin Kim) 한국독성학회 2004 Toxicological Research Vol.20 No.3
This study was to investigate single and repeated-dose toxicities of DFA IV, a new<br/> candidate of nutraceutical which has preventive effect on anemia and osteoporosis. In single-dose<br/> oral toxicity study, the test article were administered once by gavage to rats at dose level of 0, 2,000<br/> and 5,000 mg/kg. No dead animal, abnormal sign and abnormal necropsy finding was found in control<br/> and treated groups. Thus the approximate lethal dose of DFA IV was considered to be higher<br/> than 5,000 mg/kg in rats. In four week repeated dose oral toxicity study, the test article was administered<br/> once daily by gavage to rats at dose levels of 0, 500, 1,000 and 2,000 mg/kg. No abnormality<br/> was observed in mortality, clinical findings, body weight changes, food and water consumptions,<br/> opthalmoscopic findings, hematological findings, necropsy findings, organ weights and histopathological<br/> findings. In urinalysis, specific gravity was increased in 2,000 mg/kg groups of male rats. In serum<br/> biochemical analysis, creatine phosphokinase was increased in all treatment groups of male rats.<br/> These increases in urine specific gravity and serum creatine phosphokinase activity were not accompanied<br/> with related signs such as histopathological changes or clinical findings. In conclusion, four<br/> week repeated oral dose of DFA IV to rats did not cause apparent toxicological change at the dose of<br/> 500, 1,000 or 2000 mg/kg body weight. Thus it is suggested that no-observed-adverse-effect level<br/> (NOAEL) of DFA IV in rats would be 2,000 mg/kg/day body weight.
San Soon Cho,Hyo Ku Lee,Chi Won Han,Eun Soo Seong,Chang Yeon Yu,Myong Jo Kim,Na Young Kim,Wie Soo Kang,Sang Hoon Ko,Eun Hwa Son,Myoung Gun Choung,Jung Dae Lim 한국식품영양과학회 2008 Preventive Nutrition and Food Science Vol.13 No.3
Fish protein hydrolysates (FPHs) with different degrees of hydrolysis by treatment with alcalase, pronase, flavourzyme and trypsin and isolated peptide were prepared from Hwangtae (yellow dried pollack, Theragra chalcogramma). Hwangtae protein hydrolysate was fractionated according to the molecular weight into six major types of APO1 (1.3 kDa), APO2 (1 kDa), APO3 (<1 kDa), APACE (<1 kDa), APG1 (70 kDa) and APG2 (70 kDa) isolated from the hydrolysate using consecutive chromatographic methods. Soluble peptide were produced from Hwangtae and evaluated for their nutritional and functional properties. Some functional properties of FPHs were assessed and compared with those of egg albumin or the soybean protein. APO2 had the highest nitrogen solubility value (94.2%), emulsion capacity and emulsion stability of the Alaska Pollack peptide ranged from 12.4 to 39.5 (mL of oil per 200 mg of protein) and 44.0% to 77.5%, respectively. Highest and lowest fat adsorption values were observed for APG1 (9.9 mL of oil per gram of protein) and APO3 (3.8 mL of oil per gram of protein), respectively.
REVIEW Changes in Weather and Climate Extremes over Korea and Possible Causes: A Review
Seung-Ki Min,Seok-Woo Son,Kyong-Hwan Seo,Jong-Seong Kug,Soon-Il An,최용상,정지훈,김백민,Ji-Won Kim,Yeon-Hee Kim,이준이,Myong-In Lee 한국기상학회 2015 Asia-Pacific Journal of Atmospheric Sciences Vol.51 No.2
Weather and climate extremes exert devastating influence on human society and ecosystem around the world. Recent observations show increase in frequency and intensity of climate extremes around the world including East Asia. In order to assess current status of the observed changes in weather and climate extremes and discuss possible mechanisms, this study provides an overview of recent analyses on such extremes over Korea and East Asia. It is found that the temperature extremes over the Korean Peninsula exhibit long-term warming trends with more frequent hot events and less frequent cold events, along with sizeable interannual and decadal variabilities. The comprehensive review on the previous literature further suggests that the weather and climate extremes over East Asia can be affected by several climate factors of external and internal origins. It has been assessed that greenhouse warming leads to increase in warm extremes and decrease in cold extremes over East Asia, but recent Arctic sea-ice melting and associated warming tends to bring cold snaps to East Asia during winter. Internal climate variability such as tropical intraseasonal oscillation and El NiñoSouthern Oscillation can also exert considerable impacts on weather and climate extremes over Korea and East Asia. It is, however, noted that our current understanding is far behind to estimate the effect of these climate factors on local weather and climate extremes in a quantitative sense.