마리화나 흡연 후 발생한 뇌경색

이일형,김성민,배재천,권기한,이병철 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

제지슬러지의 토지주입에 관한 연구

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℃)

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.

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.

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.

내측회장동맥에 의해 형성된 척수경막동정맥루로 인한 척수병증 1예

이일형,배재천,이상무,김진혁,권기한,이병철 대한신경과학회 1999 대한신경과학회지 Vol.17 No.3

수냉쿨러의 냉각 효율 향상을 위한 플레이트 부품의 형상에 관한 연구

성윤호,김형찬,김선민,윤석영,이영웅,이상욱 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

This study investigates changes in cooling efficiency for heat sink plate width, perforated width, and chamfer angle as part of a parameter study to maximize cooling efficiency of heat sink by setting various variables on plates. The width of the plate is set to 16, 20, 24, 28 mm, perforated width 1.5, 2.0, 2.5 mm, chamfer angles 5, 10, 15 and 20°. By conducting a computational study with Ansys Fluent, the sink plate with plate width of 16mm, perforated width of 3mm and chamfer angle of 10° is shown to be the best cooling efficiency.

한 · 중 통상분쟁의 해결과 한국의 대응

이승영,이건형 韓國仲裁學會 2007 중재연구 Vol.17 No.3

The purpose of this paper is to analyze trade disputes between Korea and China in terms of broad industrial policy concept and to derive some solution, It provide first a historical overview of the basic theory for the trade policy in the developing countries to see how the trade policy evolved the different stage of option and then try to highlight features of China's trade policy development after the capitalization. An attempt is also made to review the trade dispute in Kimchi in order to identify what are the underlying reasons for policy failure. Finally, we will try to suggest trade strategy with major policy directions which could be relevant for trade development of Korea today. The trade dispute issue with China has been newly coined referring to Korea's weakening economic stance among the two powerful Asians countries, China and Korea has always been closed partners geographically and economically. The study has stressed that the Koreans should not recoil from the trade crisis but to consider it as an opportunity. Rapidly growing Chinese manufacturing industry has heightened the importance of trade between Korea and China, indicating conversion in specialization from vertical to horizontal, according to the economic research so far. This paper has proposed strategy to cope with any trade disputes between Korea and China.

V79 배양 세포에 있어 인삼추출물이 DNA복제 및 회복 합성에 미치는 분자생물학적 연구

卞富亨,徐富一,卞晟僖 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2

본 연구는 인삼추출물이 DNA 복제 및 회복 합성에 미치는 영향을 조사하기 위해 수행되었다. DNA 복제 및 회복 합성도의 측정은 V79 chinese hamster lung cell의 핵 내 DNA에 [3H]-tymidine이 유입되는 양으로 측정하였다. 그 결과 인삼추출물의 농도(0~1ug/㎖)가 높을수록 점점 더 크게 감소하였다. 이와 같이 인삼추출물에 의하여 DNA 복제 합성도가 감소하는 현상은 농도가 더 높을수록 효과적인 것으로 보아 농도에 의존한다는 것을 알 수 있었다. 한편 DNA 회복 합성도에 인삼추출물이 미치는 영향을 알아보기 위해 우선 DNA를 손상시켰다. DNA를 손상시키는 물질은 여러 가지 있으나, 본 실험에서는 자외선과 methylmethane sulfonate(MMS)를 사용하였다. 이렇게 손상된 DNA가 인삼추출물(0~1ug/㎖)에 의하여 얼마나 회복되었는가를 알아보기 위하여 인삼추출물의 농도를 각각 달리하여 V79 cell에 첨가하였다. 그 결과 인삼추출물의 농도가 높을수록 DNA 회복합성도는 증가하였다. 이와 같이 인삼추출물이 DNA 복제 합성은 억제하고, DNA 회복 합성은 증가시키는 상반된 효과를 보여 주었다. 이러한 상반된 효과는 복제합성과 회복합성의 두 과정에서 서로 다른 효소체계가 관여하기 때문인 것으로 보인다. 인삼추출물이 DNA복제 및 회복합성에 미치는 영향에 대하여 보다 더 구체적인 분자생물학적 메커니즘 연구가 이루어져야 할 것이다.

자기동조 PID제어기에 의한 전력계통 안정화에 관한 연구

정형환,김상효,이광우 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-

A new technique for the exitation control of synchronous generator is presented in this paper. The proposed technique employs a self-tuning proportional-integral-derivative(PID) power system stabilizer in order to improve the dynamic performance of a synchronous machine. The self-tuning-regulator(STR) PID using recursive-least-squares(RLS) estimated K? K?, K? Gains. A application voltage control of power system terminal voltage deviation, angular velocity deviation, and rotor angle deviation considered dynamic. Simulation results establishment that proposed STR PID control technique superiorited conventional PSS(power system stabilizer) control.