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Photoresist Exposure Parameter Extraction from Refractive Index Change During Exposure
Yong Soo Sohn,Moon Gyu Sung,Jin Kyung Oh,Sung Hwan Byun,Yeon Un Jung,Hye Keun Oh,Il Sin An,Kun Sang Lee,In Ho Park,Joon Yeon Cho,Sang Ho Lee 대한전자공학회 1998 International Conference on Electronics, Informati Vol.- No.-
Study of Avifauna from Seodeukbong to Taebaeksan Mountain in BaekduDaegan
Cho, Hae-Jin,Yoo, Seung-Hwa,Kang, Tae-Han,Shin, Yong-Un,Kim, In-Kyu National Science Museum of Korea 2011 Journal of Korean nature Vol.4 No.4
The results of the study on the avian fauna of the Taebaeksan (Mt.) region of the Seodeukbong of the BaekduDaegan between May and October of 2007 are as follows. A total of 1,831 individuals of 71 bird species were observed in the study sites, and based on the average of the highest number of individuals, the most dominant species was the Brambling (Fringilla montifringilla) at 28.6 individuals (21.8%), followed by the Yellow-throated bunting (Emberiza elegans) at 13.5 individuals (10.3%), Long-tailed tit (Aegithalos caudatus) at 11.6 individuals (8.8%), Brown-eared bulbul (Hypsipetes amaurotis) at 7.6 individuals (5.8%), Marsh tit (Parus palustris) at 6.9 individuals (5.3%) and the Great tit (Parus major) at 6.5 individuals (5.0%). This was followed by the dominance, in decreasing order, of the Jay (Garrulus glandarius) at 5.7 individuals (4.4%), Siberian blue robin (Luscinia cyane) at 4.1 individuals (3.2%), Nuthatch (Sitta europaea) at 3.9 individuals (3.0%), Varied tit (Parus varius) at 3.6 individuals (2.8%), Crowned willow warbler (Phylloscopus occipitalis) at 3.5 individuals (2.7%) and Arctic warbler (Phylloscopus borealis) at 2.9 individuals (2.2%). It is predicted that there is a need to assess the importance of this region through continuous monitoring of the protected region of the BaekduDaegan.
Cho, Hyun Jin,Suh, Dong Soo,Moon, Soo Hyeon,Song, Yong Jung,Yoon, Man Soo,Park, Do Yoon,Choi, Kyung Un,Kim, Yong Keun,Kim, Ki Hyung American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.17
<P>Anticancer activity of silibinin, a flavonoid, has been demonstrated in various cancer cell types. However, the underlying mechanisms were not elucidated in human ovarian cancer cells. The present study was undertaken to examine the effect of silibinin <I>in vitro</I> and <I>in vivo</I> on tumor growth in human ovarian cancer cells. Silibinin decreased cell viability in a dose- and time-dependent manner. Silibinin caused an increase in reactive oxygen species (ROS) generation, and the silibinin-induced cell death was prevented by the antioxidant <I>N</I>-acetylcysteine (NAC). Western blot analysis showed silibinin-induced downregulation of extracellular signal-regulated kinase (ERK) and Akt. Transfection of constitutively active forms of MEK and Akt prevented the silibinin-induced cell death. Oral administration of silibinin in animals with subcutaneous A2780 cells reduced tumor volume. Subsequent tumor tissue analysis showed that silibinin treatment induced a decrease in Ki-67-positive cells, an increase in transferase-mediated dUTP nick end labeling (TUNEL)-positive cells, activation of caspase-3, and inhibition of p-ERK and p-Akt. These results indicate that silibinin reduces tumor growth through inhibition of ERK and Akt in human ovarian cancer cells. These data suggest that silibinin may serve as a potential therapeutic agent for human ovarian cancers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-17/jf400192v/production/images/medium/jf-2013-00192v_0008.gif'></P>
Effect of Inorganic and Organic Germanium Treatments on the Growth of Lettuce (Lactuca sativa)
( Yong Hwa Cheong ),( Sung Un Kim ),( Dong Cheol Seo ),( Nam Ik Chang ),( Jun Bae Lee ),( Jong Hwan Park ),( Kap Soon Kim ),( Sang Don Kim ),( Hyeon Tae Kim ),( Jong Soo Heo ),( Ju Sik Cho ) 한국응용생명화학회 2009 Journal of Applied Biological Chemistry (J. Appl. Vol.52 No.4
Effect of Inorganic and Organic Germanium Treatments on the Growth of Lettuce (Lactuca sativa)
( Yong Hwa Cheong ),( Sung Un Kim ),( Dong Cheol Seo ),( Nam Ik Chang ),( Jun Bae Lee ),( Jong Hwan Park ),( Kap Soon Kim ),( Sang Don Kim ),( Hyeon Tae Kim ),( Jong Soo Heo ),( Ju Sik Cho ) 한국응용생명화학회 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.4
Germanium (Ge) is a rare heavy metal and is known to toxic to plants at high level. However, there is little evidence about the Ge effect on plant growth. Here, we investigated the effect of inorganic (GeO2) and organic (Ge-132) germanium on lettuce growth by treatment with various concentrations of GeO2 and Ge-132. Under GeO2 treatment, lettuce growth was not much inhibited at 2.5 mg/L concentration and then significantly inhibited at 5 mg/L concentration. However, under Ge-132 treatment, lettuce growth was not much inhibited by concentrations up to 10 mg/L. Relative fresh weight of lettuce at 2.5, 5, 10 and 25 mg/L concentrations was 99, 76, 65 and 35% in GeO2 treatments and was 105, 99, 97 and 75% in Ge-132 treatments, respectively. In GeO2 treatments, Ge was highly accumulated in the roots at concentration below 10 mg/L and in the shoots at concentration above 25 mg/L. However, Ge was primarily accumulated in the roots at all Ge-132 concentrations. Accumulated Ge amounts of plants under GetO2 treatment were 0.72 mg/ g DW in roots and 0.27 mg/ g DW in shoots at a 10 mg/L concentration. At a 50 mg/L concentration of GeO2, the Ge content was 0.77 mg/g DW in roots and 1.58 mg/g DW in shoots, respectively. Based on our results, inorganic germanium is more toxic for lettuce growth than organic germanium. Upper critical toxic levels for lettuce growth were 2.5 to 5 mg/L concentrations in GeO2, treatments and 10 to 25 mg/L concentration in Ge-132 treatments, respectively.
Reusability evaluation of biodegradable PCL (polycaprolactone) oil absorbent with porous structure
Yong Uk Cho(조용욱),Hee Kyeong Kim(김희경),Nae-Un Kang(강내운),Seung Jae Lee(이승재),Young-Sam Cho(조영삼),Kyoung Duck Seo(서경덕) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Oil leakage is one of the problems in pollution. To solve this problem, oil absorbent has been used. But the absorbent containing oil is landfilled as waste, and it causes serious problems since it takes a long time to degrade in the nature. Recently, a few studies have been taking place in reducing time by changing materials, but still have a challenge. In this study, an oil absorbent was fabricated using PCL (a biodegradable material that can be degraded by bacteria and fungi), via particle leaching method, and the ratio of PCL and salt was maintained at 1:6 wt%. To examine the porous structure inside, SEM images was captured. Moreover, oil absorption capacity was experimentally determined. Furthermore, to separate oil from absorbent, different oil removal methods (simple washing, simple melting, combination of washing and melting) were tested and the remaining oil contents were analyzed by TGA (thermo-gravimetric analysis). As a result, the absorbent made of PCL has enough ability to absorb oil and it is sustainable enough to allow 20 cycles. Also melting method show smallest the remaining oil contents among other removal methods.
Study on Reducing Cogging Torque of Interior PM Motor for Agricultural Electric Vehicle
Cho, Ju-Hee,Park, Yong-Un,Kim, Dae-Kyong Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
This paper proposes a new design of rotor shape of Interior Permanent Magnet Synchronous Motor (IPMSM) used for agricultural electric vehicle (AEV). The distribution of the residual magnetic flux density at the air gap is modified by rotor surface shape and V-type magnet angle. As a result, cogging torque and physical characteristic have been improved, and back electromotive force (back-EMF) of the suggested model has been improved to be closest to sine wave form compared to initial model. The validity of the proposed rotor shape optimization is confirmed by the manufactured IPM rotor core and measured the performance of the cogging torque.
Oil-collecting of biodegradable PCL(polycaprolactone) oil absorbent
Yong Uk Cho(조용욱),Hee Kyeong Kim(김희경),Nae-Un Kang(강내운),Seung-Jae Lee(이승재),Young-Sam Cho(조영삼),Kyoung Duck Seo(서경덕) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
Oil is one of the important resources in the world since industrial revolution. However, in the case of an oil spill, most of the oil could become tragic waste, and it could adversely affect the environment. Research to solve this problem has been actively carried out in recent years, and most of them have been studied to make a material that absorbs oil. Notwithstanding, there are still areas to be challenged. In this study, an experiment was conducted to extract the oil in the absorbent which is made by PCL (polycaprolactone), a biodegradable material. The oil absorbent was made using method called SLUP(salt leaching using powder) and its oil absorbing ability was investigated. To remove residual oil from the absorbent after squeezing process, different residual oil removal methods(simple washing, simple melting, sonication in ethanol or isopropyl alcohol) were demonstrated. Moreover, the amount of residual oil was confirmed by using TGA (thermogravimetric analysis). As a result, it was found that the lowest amount of residual oil remained when the melting method was opted comparing to other methods. [그림 본문 참조]
Cho, Su-Jung,Jung, Un Ju,Park, Hae-Jin,Kim, Hye-Jin,Park, Yong Bok,Kim, Sang Ryong,Choi, Myung-Sook Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P>The aim of this study was to evaluate the long-term effects of grape pomace ethanol extract (GPE) with or without omija fruit ethanol extract (OFE) on adiposity, hepatic steatosis, and inflammation in diet-induced obese mice. Male C57BL/6J mice were fed a high-fat diet (HFD) as the control diet and HFD plus GPE (0.5%, w/w) with or without OFE (0.05%, w/w) as the experimental diet for 12 weeks. GPE alone did not significantly affect adipogenesis and hepatic steatosis. However, the supplementation of GPE + OFE significantly lowered body weight gain, white adipose tissue weight, adipocyte size, and plasma free fatty acid and adipokines (leptin, PAI-1, IL-6, and MCP-1) levels in HFD-fed mice compared to those of the control group. These beneficial effects of GPE + OFE were partly related to the decreased expression of lipogenic and inflammatory genes in white adipose tissue. GPE + OFE supplementation also significantly lowered liver weight and ameliorated fatty liver by inhibiting expression of hepatic genes involved in fatty acid and cholesterol syntheses as well as inflammation and by activating hepatic fatty acid oxidation. These findings suggest that the combined ethanol extract of grape pomace and omija fruit has the potential to improve adiposity and fatty liver in diet-induced obese mice.</P>