http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Doo‑Won Kim,Dae Ho Kim,Sung Ryong Kim,Bo‑Hye Kim,Yun Hyuk Bang,Duck Joo Yang,Go Bong Choi,Yoong Ahm Kim,Kap Seung Yang 한국탄소학회 2019 Carbon Letters Vol.29 No.5
This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times longer than the other. The effect of processing rate on the microstructural evolutions of carbon fibers was analyzed by scanning electron microscopy after slow etching in air, as well as Raman mapping after graphitization. The rapidly processed fiber exhibited the multilayered radial structure, which is caused by the radial direction stretching of the extrusion in the spinning. In case of the slowly processed fiber, the layered radial structure formed in the spinning process was changed into a more homogeneous radial microstructure. The slowly processed fibers showed higher oxidation resistance, higher mechanical properties, and higher crystallinity than the rapidly processed one. Raman mapping confirmed that the microstructure developed during spinning was sustained even though fiber was thermally treated up to 2800 °C.
HPLC-ICP/MS 와 ICP/MS를 이용한 FAPAS 07187 쌀의 총비소, 무기비소, 카드뮴 측정
노현명 ( Hyun Myung Noh ),김지영 ( Ji Young Kim ),김원일 ( Won Il Kim ),( Anitha Kunhikrishnan ),김민지 ( Min Ji Kim12 ),김경진 ( Gyeong Jin Kim ),박기문 ( Ki Moon Park ),류지혁 ( Ji Hyock Yoo ),김두호 ( Doo Ho Kim ),이영자 ( Y 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
Metal (loid)s such as environmental contaminants affect food safety. Metal (loid)s exist trace extremely in agriculture products. Therefore it is important to analyze accurately about trace these metals. High resolution techniques and quality controls are needed to analyze these materials. In order to achieve quality results, standardized methods and techniques are required. So ISO(International Organization for Standardization) of laboratory proficiency testing is determination of laboratory testing performance by means of inter-laboratory comparison. The values have been derived as a consensus of a number of laboratories using a variety of methods. Proficiency tests were applied to analyze the metal(loid)s [inorganic arsenic (As), total As and cadmium (Cd)] in powdered rice FAPAS 07187 (Food Analysis Performance Assessment Scheme; February-April 2013). The rice powder sample was extracted with 1% HNO3 for inorganic As for microwave-assisted extraction using water at 95℃ for 90 min and their analysis by HPLC/ICPMS. Also, HNO3 for total As and Cd using microwave-assisted extraction using at 200℃ for 50 mins and analysis by ICP/MS. Validation check was performed for accuracy using CRM (NMIJ CRM 7503-a) for inorganic As, and CRM (IRMM-Rice CRM) for total arsenic and cadmium. The result were satisfactory. FAPAS 07187 the z-scores of inorganic As, total As and Cd in powdered rice were-1.8,-0.9 and 0.2(lzl<2, respectively).
Kim, Dong-Ha,Jang, Ji-Soo,Koo, Won-Tae,Kim, Il-Doo The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.28
<P>A new method of graphene oxide (GO) templating is pioneered to prepare highly porous oxide fibers consisting of crumpled two-dimensional (2D) SnO2 nanosheets (NSs). GO flakes, which are functionalized with Sn<SUP>2+</SUP> ions through electrostatic interactions between negatively charged GO and positively charged Sn ions (Sn-loaded GO), are directly electrospun. During electrospinning, Sn-loaded GO flakes undergo self-crumpling on the as-spun polymeric nanofibers. After subsequent pyrolysis, highly porous oxide NFs comprised of crumpled SnO2 NSs are achieved, offering three distinct benefits, <I>i.e.</I>, (i) a high surface area and broad pore size distribution stemming from the co-existence of 1D and 2D structures, (ii) formation and effective modulation of the electron depletion region due to the ultrasmall thickness of SnO2 NSs and small crystallite size, and (iii) the enhanced catalytic effect of Pt nanoparticles anchored on porous SnO2 NSs. As a result, under high humidity (95% RH), the Pt-functionalized SnO2 NS-assembled NFs exhibited an exceptionally high acetone response (<I>R</I>air/<I>R</I>gas = 79.4@1 ppm), excellent selectivity, fast response speed (∼12.7 s), and outstanding stability at 350 °C. Sensor arrays were further utilized to discriminate simulated diabetic breath from healthy breath <I>via</I> pattern recognition, thus demonstrating potential feasibility for reliable sensing of breath biomarkers.</P>
Kim, Ji Tae,Kim, Jong-Soo,Ko, Kwang Won,Kong, Doo-Sik,Kang, Chang-Mo,Kim, Mi Hyun,Son, Myung Jin,Song, Hyun Seok,Shin, Hyung-Jin,Lee, Dong-Sup,Eoh, Whan,Nam, Do-Hyun National Hellenic Research Foundation 2006 ONCOLOGY REPORTS Vol.16 No.1
<P>Glioblastoma is a highly angiogenic tumor with a dismal prognosis. Temozolomide (TMZ), a methylating agent is one of the most effective chemotherapeutic agents against glioblastoma. To overcome the problem that most of these tumors become resistant to chemotherapeutic regimens within a year, we investigated the antitumor efficacy of metronomic administration of low-dose TMZ in in vitro cell proliferation/cytotoxicity assay and in vivo rat and nude mouse orthotopic glioma model. By in vitro assay, we elucidated that C6/LacZ rat glioma cells were more resistant to metronomic treatment of TMZ than U-87MG human glioblastoma cells and bEnd.3 mouse brain endothelial cells. Compared with the conventional chemotherapeutic regimen of TMZ, we found that frequent administration of TMZ at a low dose (metronomic treatment) markedly inhibited angiogenesis as well as tumor growth in a TMZ-resistant C6/LacZ rat glioma model. In addition, metronomic treatment of TMZ significantly augmented apoptosis of tumor cells in this model. For the TMZ-sensitive U-87MG cells, even with a very low dose of TMZ, which is not effective to reduce tumor mass, the metronomic treatment of TMZ reduced the microvessel density, i.e. angiogenesis, in a nude mouse orthotopic model. In conclusion, for both models, the metronomic treatment of TMZ decreased angiogenesis. Especially, in TMZ-resistant glioma cells, this regimen increased apoptosis of tumor cells and decreased tumor growth. The metronomic treatment of TMZ in orthotopic glioma models demonstrated a successful antiangiogenic effect which can overcome the chemoresistance in conventional TMZ chemotherapy.</P>
Kim, Mi Sook,Choi, Yoon Jeong,Kim, Gun Woo,Noh, In Sup,Park, Yong Doo,Lee, Kyu Back,Kim, In Sook,Hwang, Soon Jung,Yoon, Gil Won Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342 No.-
<P>Characterization of an hyaluronic acid (HA)-poly(ethylene oxide) (PEO) hydrogel was performed by changing the number of side arms in a PEO molecule. Verification of grafting chemistry and mechanical strength, as well as swelling behaviors and surface morphologies of the HA-PEO hydrogels were analyzed by employing different x-linking molecular weights (MW) of PEO ranging from 1.7 to 5.0 kDa at a fixed low MW HA in the hydrogel network. Methacrylation to the HA successfully obtained via Michael type reaction between the methacrylate arm groups in HA and the thiol end groups in PEO was observed by XPS. Hydrogel formation was markedly dependent upon the numbers of thiol groups in the PEO molecule. Furthermore the lower MW PEO-based HA hydrogel demonstrated stronger mechanical properties but lower water absorption and the smaller pore sizes on its surface and cross section.</P>
A New Pea Cultivar, Cheongmi with Short Stem Height, Lodging Resistance and High Yield
Won Young Han,Sang Ouk Shin,Myoung Gun Choung,Chan Sik Jung,Doo Chull Shin,Sea Kwan Oh,Sung Taeg Kang,In Youl Baek,Duck Yong Suh,Soon Chul Kim,Dong Kwan Kim,Chang Ki Son 한국육종학회 2004 한국육종학회지 Vol.36 No.5
A new pea cultivar, Cheongmi was developed at the Yeongnam Agricultural Research Institute (YARI) in 2003. It was selected from a cross YP303 (Frescoloy / Upton) // YP113 (Sparkle/Early Bird) /3/ YP115 (Sparkle / Euiseongjaerae) in 1992. The preliminary,
Trabecular Bone Ratio of Mandible Using Micro-Computed Tomography in Korean
Won, Sung-Yoon,Kim, Sung-Hyun,Kim, Sung-Tae,Paik, Doo-Jin,Song, Wu-Chul,Koh, Ki-Seok,Chung, Moon-Kyu,Kim, Hee-Jin,Hu, Kyung-Seok Mutaz B. Habal, MD 2010 JOURNAL OF CRANIOFACIAL SURGERY - Vol.21 No.3
Cortical bone and trabecular portion play important roles in maintaining the general structure of bone. It has been reported that a decrease in bone mineral density is related with increasing age, sex, and teeth loss. However, most of the studies were done with conventional radiographic analysis. In addition, data from Korean population are rare. The aim of this study was to analyze trabecular pattern of the mandible using micro-computed tomography. Thirty-nine specimens of the mandible were prepared. Specimens were scanned with micro-computed tomography and reconstructed three-dimensionally. Sections were made parallel to the axis of each tooth. Trabecular bone ratio (TBR) was measured. Data were statistically analyzed with 1-way analysis of variance (α = 0.05). There was a statistically significant difference of TBR between dentate and edentulous mandibles in the molar region. Trabecular bone ratio of edentulous mandible in males was greater than that in females. Trabecular bone ratio of dentate mandibles reduced regularly with increasing age, whereas that of edentulous mandibles did not. It could be concluded that there were statistically significant differences in TBR according to presence of tooth, sex, and increasing age on specific areas.
Kim, Jae Hwan,Jeong, Minju,Doo, Eun-Hee,Koo, Young Tae,Lee, Seon Joo,Jang, Ji Won,Park, Jung Han Yoon,Huh, Chul Sung,Byun, Sanguine,Lee, Ki Won The Korean Society for Microbiology and Biotechnol 2022 Journal of microbiology and biotechnology Vol.32 No.9
Many probiotic species have been used as a fermentation starter for manufacturing functional food materials. We have isolated Bifidobacterium animalis subsp. lactis LDTM 8102 from the feces of infants as a novel strain for fermentation. While Glycine max has been known to display various bioactivities including anti-oxidant, anti-skin aging, and anti-cancer effects, the immune-modulatory effect of Glycine max has not been reported. In the current study, we have discovered that the extract of Glycine max fermented with B. animalis subsp. lactis LDTM 8102 (GFB 8102), could exert immuno-modulatory properties. GFB 8102 treatment increased the production of immune-stimulatory cytokines in RAW264.7 macrophages without any noticeable cytotoxicity. Analysis of the molecular mechanism revealed that GFB 8102 could upregulate MAPK2K and MAPK signaling pathways including ERK, p38, and JNK. GFB 8102 also increased the proliferation rate of splenocytes isolated from mice. In an animal study, administration of GFB 8102 partially recovered cyclophosphamide-mediated reduction in thymus and spleen weight. Moreover, splenocytes from the GFB 8102-treated group exhibited increased TNF-α, IL-6, and IL-1β production. Based on these findings, GFB 8102 could be a promising functional food material for enhancing immune function.
Hydrogen Effect on SiC Single Crystal Prepared by the Physical Vapor Transport Method
Kim, Jung Gon,An, Joon Ho,Seo, Jung Doo,Kim, Jung Kyu,Kyun, Myung Ok,Lee, Won Jae,Kim, Il Soo,Shin, Byoung Chul,Ku, Kap Ryeol Trans Tech Publications, Ltd. 2007 Materials science forum Vol.556 No.-
<P>We investigated the effects of hydrogen addition to the growth process of SiC single crystal using sublimation physical vapor transport (PVT) techniques. Hydrogen was periodically added to an inert gas for the growth ambient during the SiC bulk growth. Grown 2”-SiC single crystals were proven to be the polytype of 6H-SiC and carrier concentration levels of about 1017/cm3 was determined from Hall measurements. As compared to the characteristics of SiC crystal grown without using hydrogen addition, the SiC crystal grown with periodically modulated hydrogen addition definitely exhibited lower carrier concentration and lower micropipe density as well as reduced growth rate.</P>