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개방형 문제해결학습이 초등학생들의 수학적 창의성 및 수학적 태도에 미치는 영향
서영민 ( Seo¸ Youngmin ),박만구 ( Park¸ Mangoo ) 한국수학교육학회 2021 수학교육논문집 Vol.35 No.3
본 연구는 초등학생을 대상으로 개방형 문제해결학습을 진행하였을 때 학생들의 수학적 창의성과 수학적 태도에 대해 어떤 영향을 미치는지 알아보기 위한 것이다. 이를 위해 서울 시내 초등학교 6학년 학생들을 대상으로 9차시의 개방형 문제해결학습을 진행한 뒤 I-STATistics를 활용하여 사전 사후 t-검정하여 결과를 분석하였다. 연구 결과, 개방형 문제해결학습은 수학적 창의성 신장에 효과가 있었고, 특히 창의성의 하위 요소인 유창성에는 유의미한 결과가 없었지만, 융통성, 독창성 신장에 효과가 있었다. 또한, 개방형 문제해결학습은 수학적 태도 향상에 도움이 되며 특히 하위 요인 중 수학적 태도, 인정욕구, 동기 향상에 효과가 있었다. 그리고 개방형 문제해결학습에서 학생들은 다양한 반응을 공유하고 생각을 확장할 수 있었다. 연구 결과를 토대로 학교 현장에서 개방형 수학 문제해결을 활용을 위한 양질의 자료 개발 및 교사 연수를 지속할 필요가 있음을 제안하였다. The purpose of this study was to find out how problem solving learning with open-ended mathematics problems for elementary school students affects their mathematical creativity and mathematical attitudes. To this end, 9 problem solving lessons with open-ended mathematics problems were conducted for 6th grade elementary school students in Seoul, The results were analyzed by using I-STATistics program to pre-and post- t-test. As a result of the study, problem solving learning with open-ended problems was effective in increasing mathematical creativity, especially in increasing flexibility and originality, which are sub-elements of creativity. In addition, problem solving learning with open-ended problems has helped improve mathematical attitudes and has been particularly effective in improving recognition needs and motivation among subfactors. In problem solving learning with open-ended problems, students were able to share various responses and expand their thoughts. Based on the results of the study, the researchers proposed that it is necessary to continue the development of quality materials and teacher training to utilize mathematical problem solving with open-ended problems at school sites.
Seo, Youngmin,Hwang, Jangsun,Kim, Jieun,Jeong, Yoon,Hwang, Mintai P,Choi, Jonghoon Dove Medical Press 2014 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.9 No.-
<P>Recently, various nanoscale materials, including silver (Ag) nanoparticles, have been actively studied for their capacity to effectively prevent bacterial growth. A critical challenge is to enhance the antibacterial properties of nanomaterials while maintaining their biocompatibility. The conjugation of multiple nanomaterials with different dimensions, such as spherical nanoparticles and high-aspect-ratio nanotubes, may increase the target-specific antibacterial capacity of the consequent nanostructure while retaining an optimal biocompatibility. In this study, multi-walled carbon nanotubes (MWCNTs) were treated with a mixture of acids and decorated with Ag nanoparticles via a chemical reduction of Ag cations by ethanol solution. The synthesized Ag-MWCNT complexes were characterized by transmission electron microscopy, X-ray diffractometry, and energy-dispersive X-ray spectroscopy. The antibacterial function of Ag-MWCNTs was evaluated against <I>Methylobacterium</I> spp. and <I>Sphingomonas</I> spp. In addition, the biocompatibility of Ag-MWCNTs was evaluated using both mouse liver hepatocytes (AML 12) and human peripheral blood mononuclear cells. Finally, we determined the minimum amount of Ag-MWCNTs required for a biocompatible yet effective antibacterial treatment modality. We report that 30 μg/mL of Ag-MWCNTs confers antibacterial functionality while maintaining minimal cytotoxicity toward both human and animal cells. The results reported herein would be beneficial for researchers interested in the efficient preparation of hybrid nanostructures and in determining the minimum amount of Ag-MWCNTs necessary to effectively hinder the growth of bacteria.</P>
Seo, Youngmin,Hwang, Jangsun,Lee, Eunwon,Kim, Young Jin,Lee, Kyungwoo,Park, Chanhwi,Choi, Yonghyun,Jeon, Hojeong,Choi, Jonghoon The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.33
<P>Biofilms adhere to surfaces to produce extracellular polymeric substances (EPSs). EPSs grow and protect themselves from external stresses. Their formation causes a foul odor and may lead to chronic infectious diseases in animals and people. Biofilms also inhibit the contact between bacteria and antibiotics, thereby reducing their antibacterial activity. Thus, we describe novel nanostructures, a fusion of copper and multi-walled carbon nanotubes (MWCNTs), which increase antimicrobial activity against biofilms without being toxic to human cells. Simulations based on the stochastic response were performed to predict the efficiency of synthesizing nanostructures. The synthesized Cu/MWCNTs inhibit the growth of <I>Methylobacterium</I> spp., which forms biofilms; antimicrobial testing and cytotoxicity assessments showed that the Cu/MWCNTs were not cytotoxic to human cells. The Cu/MWCNTs come in direct contact with the bacterial cell surface, damage the cell wall, and cause secondary oxidation of reactive oxygen species. Furthermore, the Cu/MWCNTs release copper ions, which inhibit the quorum sensing in <I>Methylobacterium</I> spp., thereby inhibiting the expression of the genes that form biofilms. Additionally, we confirmed excellent electrical and thermal conductivity of Cu/MWCNTs as well as biofilm removal efficiency in the microfluidic channel.</P>