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오택근,황원정,이종운,차종문,Oh, Taek-Geun,Hwang, Won-Jeong,Lee, Jong-Un,Cha, Jongmun 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.3
산성광산배수(Acid mine drainage; AMD)를 처리하기 위한 자연정화시설의 반응조는 긴 체류시간을 위해 넓은 면적이 요구되며, 집중호우로 인해 유량이 급격히 늘어나는 여름에는 체류시간 부족으로 반응이 충분히 일어나지 못하고 많은 오염물질이 유출수로 빠져나가는 현상이 발생한다. 본 연구에서는 국내 부지 및 환경 특성으로 인해 넓은 면적이 요구되는 자연정화시설을 설치하기에 어려움이 있는 폐광산의 AMD에 응집제를 사용하여 빠른 시간 내에 오염물질을 침전시키고 탁도를 개선하는 연구를 진행하였다. W광산에서 배출되는 AMD에 무기응집제 PAC (Poly Aluminium Chloride)와 유기응집제인 PAM (Polyacrylamide) 성분이 포함된 고분자응집제를 사용하여 AMD의 상등수 및 여액의 중금속 농도와 침전된 슬러지의 형태를 파악하기 위해 입도분석, ICP-OES, SEM-EDS 분석을 실시하였다. The passive treatment was required a large area for the treatment of acid mine drainage (AMD), and pollutants were discharged with mine drainage by the increased flow rate in summer. This study was performed to improve the turbidity and to precipitate the pollutants quickly using coagulants and flocculants in AMD of abandoned mine sites that were difficult to build the passive treatment system. The coagulant PAC (Poly aluminium chloride) and flocculant PAM (Polyacrylamide) were selected to improve turbidity in W mine waters. We also tested the particle size analysis, ICP-OES and/or SEM-EDS for water and sludge samples.
오택근(Oh Taek-Keun) 서원대학교 사범대학 부설 교육연구소 2018 교육발전 Vol.38 No.1
본 연구의 목적은 확률문제 해결에서의 논쟁을 통해 어떤 창의성의 요소가 발현되는지 알아보고자 하는 것이다. 본 연구에서는 논쟁을 수학적 지식 구성의 과정으로 전제하는 사회적 구성주의 관점에 따라 3단계의 수업모형을 설계하였으며, 33명의 과학영재학교 학생들이 본 연구에 참여하였다. 연구결과, 학생들은 논쟁을 통해 이미 알고있던 확률 개념의 의미를 비판적으로 분석하였으며 이를 확장할 필요성을 인식하였다. 특히 기존의 입장을 바꾸어 다른 사람의 아이디어를 받아들이는 유연성, 서로 다른 관점을 새로운 방법으로 통합하는 독창성, 자신의 아이디어를 보다 정교화하는 능력 등 창의성의 주요 요소에 해당하는 사고의 발현을 보여주었다. 즉 논쟁은 안정화된 개념 또는 사고패턴에 대한 메타적 분석을 자극함으로써, 독창성, 유연성, 정교성 등의 창의성 발현의 계기를 제공하는 것을 확인할 수 있었다. The purpose of this study is to see what elements of creativity are developed through debate in solving probability problems. Through the analysis of prior studies, This study develope a probability task that induces cognitive conflict by implying ambiguity is suitable for debating class. In addition, according to the social constructivism view that presupposes debate as a process of mathematical knowledge composition, a three-step class model was designed and 33 students of science gifted and talented students participated in this study. As a result of the study, students critically analyzed the meaning of the concept of probability that they already knew through the debate and recognized the necessity of expanding it. In particular, it showed the development of thinking that corresponds to the main elements of creativity, such as flexibility to accept ideas from other people, originality to integrate different perspectives in new ways, and ability to refine their ideas. In other words, it was confirmed that the debate provided an opportunity for creativity such as originality, flexibility, and sophistication by stimulating meta-analysis of stabilized concepts or thought patterns.
초고성능 섬유보강 콘크리트의 역학적 성능 향상을 위한 매트릭스 강화 및 섬유표면개질
오택근(Taekgeun Oh),김기웅(Gi-woong Kim),이승원(Seung Won Lee),류두열(Doo-yeol Yoo) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.1
본 연구에서는 초고성능 섬유보강 콘크리트(Ultra-high-performance fiber-reinforced concrete)의 성능 향상을 위해 충전재와 실리카 퓸을 각각 LCD 유리 분말(Liquid crystal display glass powder, LCDGP)와 나노실리카로 치환하였다. 또한, 섬유와 UHPC 매트릭스 계면마찰력 증진을 위해 에틸렌디아민사초산(ethylendiaminetetraacetic acid, EDTA)용액으로 강섬유 표면을 개질하였다. LCDGP와 나노실리카 모두 수산화칼슘과 반응하여 수화물을 형성하는 것으로 나타났으며 EDTA 처리를 통해 섬유 표면거칠기가 증가하였다. LCDGP 혼입 시 packing density 감소에 의한 압축강도 감소가 나타났으나, 나노실리카의 혼입으로 UHPFRC의 압축강도 및 인장강도가 향상되었다. 섬유의 표면개질은 UHPC 매트릭스와 섬유 계면의 마찰력을 향상시키기 때문에 압축강도보다는 인장강도 향상에 더 효과적인 것으로 나타났다. In this study, filler and silica fume were substituted by Liquid crystal display glass powder (LCDGP) and nanosilica, respectively, to improve the performance of ultra-high- performance fiber-reinforced concrete. In addition, the surface of steel fiber was modified with ethylenediaminetetraacetic acid (EDTA) solution to improve the interfacial friction between the fiber and Ultra-high-performanceconcrete (UHPC) matrix. Both LCDGP and nanosilica reacted with calcium hydroxide to form hydrates, and the fiber surface roughness increased owing to the EDTA treatment. When LCDGP was used, the compressive strength decreased owing to a decrease in packing density; however, the compressive and tensile strengths of Ultra-high-performance fiber-reinforced-concrete (UHPFRC) were improved on using nanosilica. It was observed that the surface modification of the fiber increased the friction force between the UHPC and fiber interface; therefore, it was more effective in improving the tensile strength than the compressive strength.
고등학교 수학 학습부진학생을 위한 프로그램 개발 및 적용-ADDIE 모형 적용 사례-
오택근 ( Oh Taek-keun ) 한국수학교육학회 2018 수학교육 Vol.57 No.4
This study analyzed each process of demand analysis(A), design(D), development(D), implementation(I) and evaluation(E) of the program to support mathematics learning of students with under-achievement of math in high school. To analyze the demand, a survey was conducted on 235 high school math teachers and 334 high school students who were under-achieved in mathematics. To design and develope the program, this study linked middle school math to high school math so that the students with poor math learning could easily participate in mathematics learning. The programs developed in this study were implemented in three high schools, where separate classes were organized and run for students with poor math learning. The evaluation of the programs developed in this study was done in two ways. One was a quantitative evaluation conducted by five experts, and the other was a qualitative evaluation conducted through interviews with teachers and students participating in the program. This study found that students with poor mathematics learning were more motivated to learn, started to do mathematics, and encouraged to be confident when using learning materials that included easy problems and detailed solutions that they could solve themselves. From these results, the following three implications can be derived in developing a program to support students who are experiencing poor mathematics learning in high school. First, we should develop learning materials that link middle school mathematics to high school mathematics so that students can supplement middle school mathematics related to high school mathematics. Second, we need to develop learning materials that include detailed solutions to basic examples and include homogeneous problems that can be solved while looking at the basic example’s solution process. Third, we should avoid the challenge of asking students who are under-achieving to respond too openly.