RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 원문제공처
          펼치기
        • 등재정보
          펼치기
        • 학술지명
          펼치기
        • 주제분류
          펼치기
        • 발행연도
          펼치기
        • 작성언어
        • 저자
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • KCI등재

        유기 및 무기응집제를 이용한 산성광산배수 침전 연구

        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.

      • KCI등재

        과학영재학교 수학 수업모형 개발

        오택근 한국영재학회 2014 영재교육연구 Vol.24 No.4

        영재교육의 양적인 확장과 함께 과학영재학교의 증가를 고려할 때, 고등학생 영재를 대상으로하는 적절한 수학 수업 방법을 모색하는 것은 중요한 문제이다. 특히 수학적 창의성을 중요한 교육 목표로 제시하는 현재의 수학 교육의 흐름에 비추어 볼 때, 과학영재학교의 수학 수업에서 교사 위주의 지식 전달 방식의 수업이 아닌 학생 중심의 토론식 수업이 필요한 시점이다. 본 연구에서는 과학영재학교의 정규 수학 수업에서 적용할 수 있는 예습 기반 토론 수업모형을 설계하고 적용하였다. 연구에 참여한 학생들은 토론을 위한 예습 활동에 많은 부담을 가지면서도 토론 활동이 기존의 강의식 수업보다 수학적으로 의미 있는 경험이었다고 평가하였다. 이러한 연구 결과로부터 예습 기반 토론 수업모형이 과학영재학교 정규 수학 수업에서 의미있게 적용될 수 있다는 시사점을 도출하였다. Considering the expansion of gifted education and the quantitative increase the Gifted Science Academy, it is important to seek the appropriate methods of mathematics teaching for gifted high school students. In particular, to reflect current trends in mathematics education that the mathematical creativity is being presented as an important educational goal, Now is the time we need student-centered discussion model for regular mathematics classes, not teacher-centered instruction in the way of knowledge transfer. In this study, class model of preparation-based discussion was designed and applied to the regular mathematics classes for the Science Academy. Students participating in this research had a lot of pressure in preparation activities for discussion, but they said that the discussion compared to traditional lecture was mathematically meaningful experience. These findings suggest the implication that class model of preparation-based discussion can be meaningfully applied to the regular mathematics class.

      • KCI우수등재
      • KCI등재

        Effect of biochar application on growth of Chinese cabbage (Brassica chinensis)

        오택근,이재한,김수훈,이호철 충남대학교 농업과학연구소 2017 Korean Journal of Agricultural Science Vol.44 No.3

        Biochar has the ability to mitigate climate change, improve crop productivity, and adsorb various contaminants. The aim of this work was to confirm the effect of biochar as a soil amendment on growth of Chinese cabbage (Brassica chinensis) using a pot experiment. Biochar was produced from residual-wood burnt at a pyrolytic temperature of 400℃ and consisted of 51.6 % carbon (C) by mass. The biochar was added to the soil at 0, 1, 3, and 5% by weight, which represent about 0, 18, 54, and 90 t ha-1, respectively. The treatments were arranged in a randomized complete block design with 3 replications. The Chinese cabbage was grown for 49 days in a glasshouse in pots filled with sandy loam soil. Experimental results showed that the residual-wood biochar used for the experiment was slightly alkaline (pH 7.5). The fresh weights of Chinese cabbage were 86.22 g, 84.1 g, 63.23 g and 70.87 g, respectively, for biochar applications at 0, 18, 54, and 90 t ha-1. Compared with the control (i.e., no biochar), biochar application increased soil pH and electrical conductivity (EC). Addition of biochar (54 and 90 t ha-1) to sandy loam soil had no effect on growth of Chinese cabbage. This might be due to excessive increase of soil pH from the biochar application, leading to reduced availability of plant nutrients. Based on these results, the authors conclude that an excessive addition of biochar may have negative effects on the healthy growth of Chinese cabbage.

      • KCI등재

        Nutrient Balances and Soil Properties Affected by Application of Soybean and Barley Residues

        오택근,이창훈,손연규,이동성,김명숙,윤홍배,이동배,김석철 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.2

        An accurate analysis of nutrient balance in different cropping systems is necessary for improving soilfertilities, causing higher crop yields and quality. This study was carried out to investigate the nutrient balance,changes in soil properties, and their effects on crop yield in long-term field cultivation under mono- androtation-cropping systems (MCS and RCS, respectively). The analytical results of the soil properties showedthat the application of mineral fertilizers alone in the MCS leads the reduction of soil CEC, exchangeable Ca,and microbial biomass C and N. Compared with the MCS of soybean, the RCS of soybean and barleysignificantly improved the soil properties, which increased crop yield. It might be due to the barley residueadded to the RCS soil. Mean nutrient balances for 4 years were −55.9 kg N, +34.7 kg P2O5, and −0.3 kg K2Oha-1 for the MCS and +19.7 kg N, +107.4 kg P2O5, and −48.6 kg K2O ha-1 for the RCS, respectively. Thesenutrient imbalances mean that conventional fertilizer recommendations were inadequate for maintaining soilnutrient balance. From these results, we can conclude that the crop rotation may change comprehensivephysical, chemical, and biological soil properties. These changes could affect the nutrient balance and then thecrop yield.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼