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메타올-암모니아 혼합용액의 광반응에 미치는 산소의 영향에 관한 연구
성아영,이형철,김희정 대불대학교 1999 論文集 Vol.5 No.1
The photochemical reaction of ammonia in aqueous methanol have been investigated by using 184.9 nm UV light at 25 ℃. During the photochemical reaction of methanol-ammonia mixture solution (mole fraction = 0.10 : 5×10-4), carbonyl compounds such as formaldehyde, ethyleneglycol and glyoxal, and amine compounds such as methoxyamine, 1,1-dimethlyhydrazine and dimethylamine were produced along with minor products such as ethlyenediamine and hydrazine. The presence of oxygen affected to the photochemical reactions. The reaction probability of hydrogen radicals with both methanol and ammonia decreased in the presence of oxygen because hydrogen radicals reacted with oxygen in the air atmosphere, resulting in the decrease of Initial quantum yield.
성낙창,김정권,손희정,김은호,김형석 東亞大學校生命資源科學大學附設 農業資原硏究所 1996 農業生命資援硏究 Vol.5 No.1
To examine the agricultural availability of paper sludge, this study investigated the degradation rate of sludge, CO₂ generation out of soil treated with sludge and the degration characteristics of sludge in soil 1. Degradation rate of paper in soil at weeks after treatment was 19.0% at natural temperature and 28.0% at incubation temperature(30℃) 2. The changes of T-C, T-N and C/N ratio of paper sludge in soil at 12 weeks after treatment were 15.5%, 0.22% and 71, respectively, at natural temperature, and 14.5%, 0.24% and 60, respectively at incubation temperature. 3. The changes of pH in soil treated with paper were 6.7∼7.4 at natural temperature and 6.1∼8.0 at incubation temperature. 4. CO₂ generations in soil treated with 1.0%, 3.0% and 5.0% of paper sludge at 12weeks after treatment were 247mg/100g, 334mg/100g and 458mg/100g, respectively, at natural temperature and 385mg/100g, 550mg/100g and 618mg/100g, respectively, at incubation temperature(30℃)
바닥상태 및 들뜬상태에서 날리딕산 수용액의 해리에 관한 연구
성아영,이형철 대불대학교 1999 論文集 Vol.5 No.1
The ionization structure and ionization constant of nalidixic acid have been studied in the ground-and excited states at room temperature. The nalidixic acid has two chromophore in aqueous solution and the hydrogen atom combined in the carboxyl group of the molecule was dissociated in the aqueous solution. The ionization constant of nalidixic acid in the ground state was determined by spectrophotometric method and by potentiometric titration method. The pKa value of the substance was found to be 6.35 in aqueous solution. In the excited state, it was found to be 1.75. This result indicates that dipole moment of the molecule increased in the excited state very much rather than in the ground state.
평가 문항을 통한 중학교 과학영재 학생들의 빛 개념 지식상태 분석
이형재,하지선,박상태 韓國英才學會 2011 영재교육연구 Vol.21 No.4
이 연구에서는 K대학교 영재교육원의 중학교 과학영재 학생들 30명을 대상으로 빛에 관한진단평가 15문항을 개발하여 적용하였다. 그리고 빛에 대한 학생들의 지식상태에 관하여 지식공간론을 활용하여 분석하고 이것으로부터 얻은 위계를 도식화함으로써 중학교 과학영재학생들의 지식상태를 파악함은 물론 교수 학습 방법을 개선하기 위한 기초자료로 활용하고자하였다. 이러한 연구 목적을 달성하기 위하여 중학교 과학영재 학생들의 빛에 대한 지식상태평가결과를 분석하였고, 문항 간 위계구조 및 개별 학생들의 지식상태를 분석하였다. 그 결과학습 집단 내에서 개인별로 서로 다른 지식구조를 갖고 있었고, 이에 따른 학습 진단도 서로다르게 평가해야 함을 알 수 있었으며, 평가 문항과 문항 간의 관계(위계 구조)와 개별 학습자의 지식상태를 알 수 있게 한다는 시사점을 얻을 수 있었다. In this study, we developed and applied 15 evaluation questions about light to 30middle school students in K University Science Education Institute for the Gifted .Then we used the theory of knowledge space and analyzed the middle school ScienceGifted Students' knowledge state about light. By schematizing the hierarchy from it, weintended to not only measure students' knowledge state about light, but use it as thebasic materials to improve teaching methods. To achieve the purpose of this study, weanalyzed the evaluation results and individual knowledge state and hierarchy ofquestions. As a result, there were different knowledge structures in the individual, andwe found that we should diagnose them differently. In addition, we have hadimplications that it has the connection with each questions and the individualknowledge state.
牧楡湯이 人體 肺癌細胞의 變化에 미치는 影響에 關한 分子生物學的 硏究
李炯周,金相贊,徐富一,金先熙,卞晟僖 대한본초학회 1999 大韓本草學會誌 Vol.14 No.1
This experimental study was performed to investigate the effects of Mokyou-Tang on cell cycle and gene expressions of human lung cancer cell. I examined the cell cycle progression and cell cycle-related gene expression in A549 using a flow cytometry and a quantitative PT-PCR analysis. The treatment groups, in accordance with concentration of Mokyou-Tang were classified as 3 group(MYT 100㎕/㎖, MYT 500㎕/㎖, MYT 1,000㎕/㎖), and according to treatment time, were classified as 2 group(24hours, 48hours). The results were summarized as follows; 1. In cell cycle stage, MYT 100㎕/㎖(48hours) and 1000㎕/㎖(48hours) groups were increased as compared with control group, especially 1000㎕/㎖(48hours) group showed eminent increase. 2. In p53 gene, MYT 500㎕/㎖(48hours) and 1000㎕/㎖(48hours) groups showed eminent suppressive effect to cancer cell. 4. CDKNI gene was decreased in all treatment groups, this mean that MYT has suppressive effect to proliferation of cancer cell. 4. In GADD45 gene was decreased in all treatment groups, this mean that MYT has suppressive effect to proliferation of cancer cell. The results suggest that MYT promotes G1 cell cycle arrest and suppresses the proliferation of cancer cell. Thus, it seems likely that MYT has suppressive effect to proliferation of lung cancer cell.
한국산 뱀독이 개구리 심실근육세포의 수축력과 활동전압에 미치는 영향
한형일,방효원,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1984 中央醫大誌 Vol.9 No.3
In order to observe the effects of freeze-dried saliva of Agkistrodon caliginosus and Agkistrodon saxatilis, the Korean poisonous snakes, on the contractility and action potential of frog ventricular muscle cells, the isometric tension in a vertical chamber and the action potential in horizontal chamber were recorded and analyzed. The following results were obtained; 1. ED_50, to reduce the contractility was 4-8ug/ml in the case of A. saxatilis and 8-16ug/ml in the case of A. caliginosus which all were higher than that of A. brevicaudus and the inhibitory effect on the contractility was greater in the case of A. saxatilis than that of A. caliginosus. 2. In the case of A. saxatilis, APD_50(time to repolarize 50% of action potential amplitude) decreased from 820±80 ms to 710±60 ms, the overshoot and the V max(Maximum depolarization rate) decreased from 34±8 mV to 18±4 mV, from 98±8 V/s to 89±4 V/s respectively. 3. In the case of A. caliginosus, ADP_50 decreased from 880±70 ms to 720±40 ms, the overshoot and the V max decreased from 28±6 mV to 20±4 mV, from 89±8V/s to 77±12V/s, respectively. 4. Inhibition of contractility and overshoot potential were more prominent in A. saxatilis and APD_50 was more decreased in A. caliginosus. The above result showed that Korean snake venoms would decrease the ionic current underlying the rapid upstroke phase and slow inward currents by calcium ions simultaneously in a frog ventricular muscle cells.
金南亨,楊城基 제주대학교 1993 논문집 Vol.36 No.-
조석류 해석의 제1보로서, 유한요소법으로 천해역에서 조석방정식을 해석해 보았다. 본 계산의 결과는 실제의 결과와 일치하는 것을 알 수 있으므로, 해석방법의 타당성이 인정된다. 따라서, 복잡한 형태로 되어 있는 지형을 대상으로 하는 경우, 본 해석방법이 종래의 유한차분법보다 실용적이라 할 수 있겠다. 개발된 유한요소법의 수치모델을 현지에 적용할 경우는, 본 계산에서는 생략되었지만, 2차원적으로 작용하는 외력항을 고려할 필요가 있는 것으로 사료된다. In this paper, a numerical model of the tidal current problem by using finite element method is described. Assuming that the tidal current is periodic motion, the Galerkin approach with linear triangular elements is employed as the numerical integration procedure in space. Also, shallow water theory neglecting the bottom friction, wind force and Coriolis force is employed. In order to stabilize the computing procedure, two-step explicit method, so-called the Kawahara scheme, is applied for the discretization of time. By the computation of numerical examples, it is shown that the present finite element method is suitable, and good results are attained.
김남형,양성기 제주대학교 해양연구소 1992 해양자원연구소연구보고 Vol.16 No.-
Boundary element method based on Green's formula is applied to the analysis of nonlinear solitary wave. Assuming the fluid to be inviscid and incompressible, and the flow to be irrotational. the problem is formulated mathematically as a nonlinear initial-boundary values problem by the use of a governing differential equation and boundary conditions. The Laplace equation and boundary conditions are transformed into an integral equation by applying Green's formula. Two equations thus obtained are discretized by the use of the Galerkin's method spacewise and the finite difference method timewise. Collection method is employed for the discretization of the integral equation. Due to the nonlinearity, the incremental method is used for the numerical analysis. Numerical results are compared with analytical solution. Excellent agreements are obtained, and this indicates the availability of the boundary element analysis as a numerical technique for nonlinear free water waves.