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      • KCI등재

        Optimization of Jirisan Mountain Cudrania tricuspidata leaf substance extraction across solvents and temperatures

        김용주 대한약침학회 2018 Journal of pharmacopuncture Vol.21 No.2

        Objective: The aim of this study is to optimize the extraction of beneficial substance from Cudrania tricuspidata leaves grown at Jirisan Mountain in South Korea by three different solvents depending on extraction time and at different temperature. Methods: The total phenolic contents were determined by the method reported by Sánchez-Moreno et al. The total flavonoid contents were analyzed by Slinkard and Singleton. The DPPH radical scavenging activity was determined according to the method reported by BloisResults: The extraction yield for each solvent is 9.05– 14.1%, 2.17–5.67%, and 2.3–3.9% for D.W., ethanol, and hexane, respectively. The overall results were maximized for the extract obtained with D.W. for 5 min at 100°C. The average phenol contents were 77.11, 45.64, and 0.343 mg/g at 100°C in water, 78°C in ethanol, and 68°C in hexane, respectively. The flavonoid contents were the highest in the materials extracted with D.W., and were increased with increasing temperature, regardless of the extraction solvents, whether water (green), polar organic ethanol, or nonpolar organic hexane. In the ethanol extract, the flavonoid contents are increased gradually from 5.66 mg/g to 7.73 mg/g. The total flavonoid contents were proportional to the concentrations of the water extracts, ranging from 4.14 mg/g to 48.89 mg/g. The antioxidative activities of the water-extracted compounds are generally increased with increasing temperature from 42.5% to 85.5%. Those of the hexane extracts are increased slowly from 3.79% to 8.8%, while those of ethanol extracts are increased from 29.8% to 47.4%. Conclusion: The extraction yields were dependent upon solvents for extraction as well as extraction time and the temperature. The optimal extraction time was 5 min and the extraction yields were increased with increasing temperature excepted hexane. Of the three tested extraction solvents, the greenest solvent of water shows excellent results, suggesting that water is among the most effective solvents for natural sample extractions for general medicinal, pharmaceutical, and food applications.

      • 초등학교 여교사의 직무만족과 역할갈등 분석

        김용주,이학주,정복희 경상대학교 2000 學生生活硏究所報 Vol.26 No.-

        The purposes of this study were to examine the job satisfaction and role conflict of female elementary school teachers, and to analyze the relationship between those two factors. The following four research questions were raised. 1. What are the causal factors that brings about the job satisfaction of female elementary school teachers? 2. In regard to these causal factors, are there significant differences dependant upon such variables as teaching experience, the size of schools, and marital status? 3. What is the level of role conflict for married female elementary school teachers, and how significant are the differences according to the above variables? 4. What are the relationships between the job satisfaction factors and role conflicts of female elementary school teachers? For the purpose of this study, the researchers conducted questionnaire survey to the 300 female elementary school teachers in Kyong-nam Province. The study instrument is composed of 38 five-point Likert type questions. Major results of this research were as follows. First, the causal factors that bring about the job satisfaction of female elementary school teachers largely include school administration, a sense of recognition, promotions and raises, a physical environment, job duties, relationships with other teachers, meaningfulness of teaching, and working conditions. Second, the score on the job satisfaction of female elementary school teachers was above average(3.42 of 5.00). In regard to teaching experience, the respondents who have more than 20 years of experience had higer scores than the other groups of respondents. As for the size of schools, it was shown that schools with fewer than 23 classes had a relatively higher satisfaction rate than the other groups. Marital status had no significant differences. Third, the degree of the role conflict of married female elementary school teachers was low on the whole. Rather than the role conflict between home life and teaching duties as a teacher, the one as a housewife who has a job was greater. While teaching experience had no significant differences, the number of children had significant relations with female teachers role conflicts. Fourth, it was shown that the relationship between the causal factors of job satisfaction and role conflict of female elementary school teachers had no significant co-relationships.

      • KCI등재

        황련 열수추출물의 항산화 활성 효과

        김용주,이문조,박진우,김준기,최달영,김철호 한국생명과학회 2000 생명과학회지 Vol.10 No.3

        상용되는 한약재의 하나인 황련(Coptis chinensis Franch)를 열수추출하여 얻은 추출물의 유지에 대 한 항산화 활성을 검토하였다. 즉 황련 추출물과 항산화제인 BHT, ascorbic acid 및 $\alpha$-tocopherol을 각 각 linoleic acid에 소정량 첨가하고 5$0^{\circ}C$에서 일정기간 저장하여 linoleic acid의 산화 안정성을 비교 검 토하였으며, 또한 유지 자동산화의 촉진인자인 금속이온(Fe3+, Zn2+)을 첨가하여 황련 추출물의 금속이 온 봉쇄효과를 조사하였다. 황련 추출물의 농도에 따른 항산화 효과는 전 농도별에서 높은 항산화 효과 를 나타내었다. 그리고 시간 경과에 따른 항산화 효과에 있어서도 정도의 차이는 있지만 각 농도(5mg 및 10mg)에서 유도기의 연장효과가 상당히 우수한 것으로 나타났다. 황련 추출물과 항산화제와의 비교 에 있어서는 합성 항산화제인 BHT 및 ascorbic acid와 거의 같은 항산화력을 나타내었으며, 천연 항산 화제인 $\alpha$-tocopherol보다는 아주 우수한 것으로 나타났다. 황련 추출물의 금속이온 봉쇄효과에 있어서 는 linoleic acid에 황련 추출물과 Fe3+ 및 Zn2+을 첨가한구가 황백 추출물의 무첨가구보다 항산화 효과 가 아주 우수한 것으로 나타나 금속이온 봉쇄력이 강한 것으로 나타났다. This study was carried out to investigate the antioxidant activity of the water extract from Coptis chinensis Franch. Coptis chinensis Franch. exhibited antioxidative activity at all concentration tested. The extract was as good as antioxidative action of the synthetic antioxidant, butylated hydroxytoluene and ascorbic acid; Also, the one was superior to that of natural antioxidant, $\alpha$ -tocopherol. With heavy metal ions (Fe3+, Zn2+) present, Coptis chinensis Franch. showed strong antioxidative effect.

      • KCI등재

        어휘판단 과제에서의 회귀억제효과

        김용주 陸軍士官學校 2000 한국군사학논집 Vol.56 No.-

        "Inhibition of return(IOR) refers to bias against attending to and/or detecting visual stimuli at recently attended spatial locations. IOR is caused by suddenly introduced visual cues and reflects an attentional bias toward novel locations. This effect is observed normally in the experiments, in which the subject have an detection task. The present study investigated inhibition of return in an lexical decision task, which is a sort of discrimination task. In Experiment  1 was examined the inhibitory effect under the variable semantic relations between cue-word and target-word. In Experiment 2 was simplified the conditions and investigated the relationship of IOR with the semantic processing. It was founded that IOR can be observed in a lexical decision task and it was weaked through the semantic processing, but the semantic processing was not influenced by IOR.

      • Analysis of ^(16)O+^(208)Pb Elastic Scattering with Eikonal Approximation

        김용주,박규은 濟州大學校 師範大學 科學敎育硏究所 1992 科學敎育 Vol.9 No.1

        Using the phase shift analysis based on the eikonal approximation. the analysis for elastic scattering data of ^(16)O + ^(208)Pb system at E_(lab)=793 and 1503 MeV are performed. The experimental data and the calculated results are found to agree each other comparatively.

      • E_(lab)=1503 MeV에서 Mclntyre 파라미터 위상 이동량을 이용한 ^(16)O+^(40)Ca 탄성산란 분석

        김용주,강동식,박규은 濟州大學校 師範大學 科學敎育硏究所 1998 科學敎育 Vol.15 No.-

        A semiclassical phase shift analysis of the ^(15)O + ^(40)Ca elastic scattering at E_(lab) = 1503 MeV is presented uming the Mchtyre's parametrized phase shift. The calculated cross section is found to be good agreement with the experimental data. The presence of an nuclear rainbow experimental optical potential by inversion is calculated and compared with the one of optical model analysis.

      • KCI등재

        희귀억제에 대한 억제적 위치표시 가설

        김용주 陸軍士官學校 1998 한국군사학논집 Vol.54 No.-

        "Inhibition of return"(IOR) refers to a bias against attending to and/or detecting visual stimuli at recently attended locations. In two experiments, we examined an inhibitory location tagging account of IOR following the simultaneous presentation of multiple location cues(Exp. 1) and the secondary task(Exp. 2). In agreement with previous work, experiment 1 demonstrated that response inhibition can be associated with multiple location at the same time. But there was also response inhibition on the location between the multiple cues, this result ruled out a purely location tagging account of IOR. In experiment 2, there was also inhibitory effect although subject had memorial and attentional load during executing the detection task. this indicated that IOR is not based on high level of information processing.

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