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동료를 지도하는 수학 학습 능력 우수 학생의 학습 과정 탐색
이환철,허난,강옥기 대한수학교육학회 2010 학교수학 Vol.12 No.2
Small Group Collaborative Instruction in school settings has been endorsed by many educational experts over the years. Some studies found that learners greatly benefit from one another through communication and interaction with their peers. These studies previously indicated improvement of a learner’s academic ability as well as the application of the affective domain when using this type of instruction. Lower-level students with limited mathematical abilities improved their problem-solving and conceptual thinking skills when tasked to work with other learners. On the other hand, the effectiveness of this process was questioned to be less evident with higher-level performers. Therefore, this study was designed to observe the efficacy of Small Group Collaborative Instruction on higher-level students and to explore their learning process as they interact with and teach lower-level students. This study observed that higher-level students use high-level mathematical thinking skills when helping lower-level students, and they improved problem-solving ability as well as communication skills. 많은 교육학자들은 학교 수업에서 소집단 협력학습을 강조하고 있다. 소집단 협력학습은 구성원 간의 의사소통을 통해 학습 능력의 향상 뿐 아니라 정의적 태도 면에서도 도움을 준다. 학습 능력의 향상이라는 측면에서 보면 상대적으로 부진한 학생들은 개념, 원리, 법칙들을 이해하면서 문제해결 능력이 향상됨을 스스로 느끼는데 반해 상대적으로 우수한 학생들은 그 효과에 대해 반신반의하고 있다. 따라서 본 연구는 수학 학습 능력이 상대적으로 우수한 학생이 부진한 학생과의 상호작용 특히 부진한 학생에게 수학을 지도하면서 어떤 수학 학습 과정을 가지는지를 탐색하고자 하였다. 본 연구 결과 상대적으로 우수한 학생은 동료를 지도함으로 인해 문제해결 능력과 의사소통 능력이 향상되는 모습을 보였으며, 높은 수준의 수학적 사고를 하는 모습을 보였다.
이환철,이재헌,Hwan Cheol Lee,Jae-Heon Lee 한국플랜트학회 2023 플랜트 저널 Vol.18 No.4
In this study, to increase the methane content of biogas supplied from Nanji Water Regeneration Center and to purify impurities, a three-stage membrane purification process was designed and installed to demonstrate operation. The methane concentration of biomethane produced in the 2 Nm3/h purification process was set to three cases: 95%, 96.5%, and 98%, and the membrane area ratio of the membrane was 1:1, 1:2, 1:1:1, The optimum conditions for the membrane area of the separator were derived by changing to five of 1:2:1 and 1:2:2. 3 stage separation membrane process of 30 Nm3/h was installed to reflect the optimum condition of 2 Nm3/h, and biomethane production of 98% or more of methane concentration was demonstrated. As a result of the operation of the 2 Nm<sup>3</sup>/h refining device, the methane recovery rate at the 98% methane concentration was 95.6% when the membrane area ratio was 1:1 as the result of the two-stage operation of the separator, and the recovery rate of methane at 1:2 was increased to 96.8%. The methane recovery rate of the membrane three-stage operation was highest at 96.8% when the membrane area ratio was operated at 1:2:1. The carbon dioxide removal rate was 16.4 to 96.4% and the 2:2 to 95.7% film area ratio in the two-step process. In the three-step process, the film area ratio was 1:2:1 to 95.4%, and the two-step process showed higher results than the three-step process. In the 30 Nm3/h scale biogas purification demonstration operation, the methane concentration after purification was 98%, the recovery rate of methane was 97.1%, the removal rate of carbon dioxide was 95.7%, and hydrogen sulfide, the cause of corrosion, was not detected, and the membrane area ratio was 1:2:1 demonstration operation, biomethane production with a methane concentration of 98% or higher was possible.