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Ryu, BoMi,Choi, Il-Whan,Qian, Zhong-Ji,Heo, Soo-Jin,Kang, Do-Hyung,Oh, Chulhong,Jeon, You-Jin,Jang, Chul Ho,Park, Won Sun,Kang, Kyong-Hwa,Je, Jae-Young,Kim, Se-Kwon,Kim, Young-Mog,Ko, Seok-Chun,Kim, G The Korean Society of Phycology 2014 ALGAE Vol.29 No.4
Despite the extensive literature on marine algae over the past few decades, a paucity of published research and studies exists on red algae. The purpose of this study was to evaluate the potential therapeutic properties of the ethanol extract of the red alga Callophyllis japonica against lipopolysaccharide (LPS)-stimulated macrophage inflammation. The C. japonica extract (CJE) significantly inhibited the nitric oxide (NO) production and the induced dose-dependent reduction of the protein and mRNA levels of inducible nitric oxide synthase and cyclooxygenase-2. Additionally, the CJE reduced the mRNA levels of inflammatory cytokines, including tumor necrosis factor-${\alpha}$, interleukin (IL)-$1{\beta}$, and IL-6. We investigated the mechanism by which the CJE inhibits NO by examining the level of mitogen-activated protein kinases (MAPKs) activation, which is an inflammation-induced signaling pathway in macrophages. The CJE significantly suppressed the LPS-induced phosphorylation of c-Jun N-terminal kinase, extracellular signal-regulated kinase and p38 MAPK. Taken together, the results of this study demonstrate that the CJE inhibits LPS-induced inflammation by blocking the MAPK pathway in macrophages.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
이상일,서석훈,홍경민,신용섭,장상희,신부영 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
Bio-and-photodegradable polymer composites were prepared by blending biodegradable aliphatic polyester and photodegradable master batch(M/B). Photodegradability, biodegradability, thermal properties and mechanical properties were investigated. The biodegradability of EnPol(G4600) composites decreased wish increasing the amount of M/B, while that of EnPol(G8000) composites increased. Tensile strength and elongation decreased with increasing the time of outdoor exposure and the amount of M/B but modulus comparatively maintained. The mechenical properties decreased as the content of M/B increased, while the melting temperature unchanged.
김도일,정경환,김종호,서곤 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-
Dealkylation of m-diisopropylbenzene (m-DIPB) was studied on various zeolite catalysts which have different pore structures. The very low dealkylation activity was observed on MFI zeolite because of its small pore size. The m-DIPB low conversions of MOR and FAU zeolites were due to severe deactivation of the catalysts by carbon deposites. On the other hand, the high conversion and the low deactivation in the m-DIPB dealkylation were observed on BEA zeolite with bent pores and MWW zeolite with pillow-type pores. In particular, the MWW zeolite shows a very high conversion, because the polymerization of m-DIPB resulting to carbon deposites is suppressed by sharing one m-DIPB molecule per unit pore. The high selectivity for benzene on MWW zeolite is explained by long retention time of reaction intermediate inducing consecutive dealkylation.
송일호,신경수 한국생산성학회 2003 生産性論集 Vol.17 No.1
The purpose of this study is to investigate the productivity gap by job segregation based upon the gender composition of occupations in Korea. According to Human Capital Theory, the differentials of human capital investments result in productivity gap which affects individuals' income. Therefore, it can be explained that and individual inmale jobs earns more than in a female jobs because of productivity differences between men and women. The empiricl results of this study can be summaried as the following : In general, there are no common results in Index of Sex Segregation. In addition, the wage gap by gender in OCC4(skilled labor in agriculture, fishery, and forest) is the highest among the all occupations; however, the wage gap in OCC3(services and sales) is not singificantlydifferent. Moreover, the productivity gap by gender in OCC4 is the highest among the all occupations; howemve, the productivity gap in OCC3 is not significantly different. These empirical results support Human Capital Theory.
이은미,박종희,경기열,전일순,조혜정,지웅길 충남대학교 약학대학 의약품개발연구소 2004 藥學論文集 Vol.19 No.-
The aim of this study was to improve the moisturizing and water retaining effects of a gel containing poloxamer 407, glycerin, sod hyaluronate, sorbo(sorbitol 70%). Topical preparations were formulated as a gel containing different concentration poloxamer 407, glycerin, sod. hyaluronate, sorbo(sorbito1 70%), lipid(ceramide. sphingosine ratio 1:l). We tested a various combination of different additives for the moisturizing effect The water holding capacity of the mixture was measured using a moisture analyzer. In vivo test was carried out on human skin using Skicon-200 and water retaining effect was increased by addition of lipid. Water evaporation test was performed by various concentration of additives and water evaporation characteristics of the preparations were determined using the moisture analyzer. Moisturizing and water retaining effects was increased by adequate combination of various additives with topical gel formulations.
김동호,전성일,최창식,윤병성,윤경구 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A
The purpose of this paper is to investigate for strain measurement of concrete pavement slab at field. The early-age behaviors of concrete pavement were measured using the strain gages. From the static and dynamic wheel loading tests, the outputs from each gages were recorded. The measured data, also, was compared to those from finite element analysis. The static wheel loading tests were performed in twice, and the dynamic wheel loading tests were performed at the speed 10㎞∼50㎞. The results could be summarized as follows: To embed the strain gage accurately and stably in concrete pavement, a chair and protective box must be used. The protective box must not be affected from the outside vibrating. From the results of early-age strain measurement, it was found that the strain varied at the maximum value of 180 με. From the results of static wheel loading tests, A1, A2 and B gages generally developed a consistent tendency. When comparing the results from the measured at field and the calculated by FEM analysis, the data of A1 and B gages were similar to that from theory. The values from the field test were generally higher than that from the theory. From the results of dynamic wheel loading tests, it was known that the measured strain at field became smaller as the truck speed became faster, indicating the maximum at the range of 12∼13 με.