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- 저자 : 오택근(Taek-Keun Oh) (검색결과 78 건)
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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.
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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.
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신국식,오택근,허승오,현병근,조현준,손연규,Shin, Kook-Sik,Oh, Taek-Keun,Hur, Seung-Oh,Hyun, Byung-Geun,Cho, Hyun-Joon,Sonn, Yeon-Kyu 충남대학교 농업과학연구소 2014 Korean Journal of Agricultural Science Vol.41 No.4
In general, fractal analysis which is based on self-similarity as a basic theory has been mainly used to define the characteristics of complex mathematical figures, however, considering its basic theory, it can be also used to analyze the surface ununiformity of unknown materials. In this study, the soil samples were collected from the reclaimed (remodelled) agricultural fields which mean that the external soil is artificially piled up (mainly up to 1m) on the lands, Naju, Jellanam-do and Gumi, Gyeongsangbuk-do, and the conventional agricultural fields, Anseong, Gyeonggi-do and Hwasoon, Jellanam-do, and compared using fractal dimension analysis on the basis of the results of chemical properties. The score of fractal dimension ($D_0$) for organic matter was lower in Hwasoon (1.46) and Naju (1.58) than Anseong (1.86) and Gumi (1.96), and this trend showed similarly in soil pH. On the basis of the results of chemical properties, fine textured-soils (Hwasoon and Naju) and conventional agricultural fields were chemically uniform compared to coarse textured-soils (Anseong and Gumi) and the reclaimed. Therefore, it is required to develop technical methods for integrated soil management to the reclaimed lands.
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이창훈,김명숙,공명석,김유학,오택근,강성수,Lee, Chang Hoon,Kim, Myung Sook,Kong, Myung Seok,Kim, Yoo Hak,Oh, Taek-Keun,Kang, Seong Soo 충남대학교 농업과학연구소 2014 Korean Journal of Agricultural Science Vol.41 No.4
Soil moisture is an important factor for the availability and circulation of nutrients in arable soil. The purpose of this study was to set thresholds moisture content on soil nitrate concentration in the solution for real-time diagnosis. Sandy loam, silt loam, and sandy loam was filled with $1.2g\;cm^{-3}$ at Wagner pots, 0, 100, and $200mg\;L^{-1}$ of $KNO_3$ was saturated. Nitrate in standard solution was recovered about 95% by passing the porous cup. Nitrate concentrations in sampling of soil solution were examined by using a porous cup. The soil solution was higher in accordance with sandy loam> silt loam> clay loam, limited water filled pore space for sampling soil solution was 33.7, 56.4, and 62.2%, respectively. Nitrate concentration in the soil solution was negligible at sandy loam and silt loam during sampling periods, which was decreased about 50~82% in clay loam compared to the initial $NO_3$-N concentration in the saturated $KNO_3$ solution. Over limitation of soil solution sampling, soil EC and $NO_3$-N content were increased with the saturated $NO_3$-N concentration, regardless of soil texture (p<0.05). Conclusively, soil solution by using a porous cup was possible, regardless of the soil texture, which was useful for the diagnosis in nitrate concentration of soil solution. However, because nitrate concentration of soil solution in a clay loam changes, it was necessary for careful attention in order to take advantage for the real-time diagnosis of nitrogen management in soil.
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토양특성 기반 토양수분 함량 예측을 위한 PTF 적용성 검정
허승오,손연규,현병근,신국식,오택근,김정규,Hur, Seung-Oh,Sonn, Yeon-Gyu,Hyun, Byung-Kewn,Shin, Kook-Sik,Oh, Taek-Keun,Kim, Jeong-Gyu 충남대학교 농업과학연구소 2014 Korean Journal of Agricultural Science Vol.41 No.4
Identifying soil water content as a major factor for evaluating irrigation and water resource is a primary module to develop a prediction model. A variety of PTFs (Pedo-Transfer Functions) are applied in the models to estimate soil water content, the analysis techniques, however, which compare the estimated from models and the measured by instruments, are not reached at the level to demonstrate the effectiveness of the PTFs in Korea. Many soil physicians such as Eom, Peterson, Rawls, Saxton, Bruand, Baties, Tomasella & Hodnett (T&H), and Minasny, have developed analytic models using PTFs. Soil data for the analysis used soil water contents on 347 soil series (10 kPa), 358 soil series (33 kPa), 356 soil series (1,500 kPa) established by NAAS (National Academy of Agricultural Science). A coefficient of determination on soil water content at 10, 33 and 1,500 kPa was the highest as 0.5932 in EM (Eom model), 0.6744 in REM (Rawls model) and 0.6108 in REM, respectively. In conclusion, it is strongly suggested that the use of EM or REM is suitable for estimating soil water content in Korea although SM (Saxton model) has been widely used.
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시설재배지에 질소관비 농도가 오이생육과 질산태 질소에 미치는 영향
강성수,김명숙,공명석,김유학,오택근,이창훈,Kang, Seong Soo,Kim, Myung Sook,Kong, Myung Seok,Kim, Yoo Hak,Oh, Taek-Keun,Lee, Chang Hoon 충남대학교 농업과학연구소 2014 Korean Journal of Agricultural Science Vol.41 No.4
To evaluate the impact of nitrogen fertigation on crop growth and $NO_3$-N concentration in the soil solution, field experiment for cucumber cultivation during spring and fall season were carried out in on-farm located in Byeongcheon-myeon, Chunan-si, Chungcheonnam-do. Supplying nitrogen of 120-150 mg/L by fertigation device into soil per week reached to maximum yields of cucumber fruits. However, cucumber growth did not show any significant difference between nitrogen levels. Nitrogen supply of 400 mg/L, highest N levels, did not affect cucumber growth. Difference between green values of cucumber leaves using RGB scores were closely related with cucumber yields, and therefore, this results suggests that green values of cucumber leaves could be used as a way of determining the application rates of nitrogen for cucumber cultivation period under fertigation system.
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단백질 흡착성을 갖는 막 크로마토그래피용 재생 셀룰로오스 기반 음이온 교환 다공성 분리막의 제조
서정현,이홍태,김태경,조영훈,오택근,박호식,Seo, Jeong-Hyeon,Lee, Hong-Tae,Kim, Tae-Kyung,Cho, Young-Hoon,Oh, Taek-Keun,Park, HoSik 한국막학회 2022 멤브레인 Vol.32 No.5
바이오산업의 발전으로 의약품, 식품 등의 생산 과정의 분리/정제 공정에 사용되어 왔던 기존의 컬럼 크로마토그래피를 대체하여 더 높은 처리효율을 갖는 막 크로마토그래피가 부상하고 있다. 본 연구에서는 서로 다른 기공 크기의 두 가지 상용 셀룰로오스 아세테이트(Cellulose acetate, CA) 분리막을 탈아세틸화 과정을 통해, 리간드의 개질이 용이한 다공성 재생 셀룰로오스 지지체를(Regenerated cellulose, RC) 제조하였다. 음이온 교환능을 부여하고자 grafting을 수행하였으며, 구체적으로는 UV 중합법을 통해 4차 암모늄을 포함하는 음이온 교환 리간드(MAPTAC)를 부착하여 음이온 교환용 흡착막을 제조하였다. 단백질 흡착 용량은 정적 흡착 용량(Static binding capacity, SBC)시험을 통해 총 단백질 흡착 용량을 측정했고, 동적 흡착 용량(Dynamic binding capacity, DBC)을 측정하여 상용막과 비교 평가하였다. 성능 평가 결과 단백질 흡착량은 넓은 표면적에 의해 리간드 밀도가 높은, 기공 크기가 작은 순서로 높게 측정되었고, 상용 CA분리막을 탈아세틸화하고 리간드를 부착시킨 분리막(RC 0.8 + MAPTAC 43.69 mg/ml, RC 3.0 + MAPTAC 36.33 mg/ml)이 상용 막 크로마토그래피 제품(28.38 mg/ml) 대비 높은 흡착 용량을 보였다.
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