• 한국초등과학교육학회지:초등과학교육
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• 제36권1호
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• pp.61-72
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• 2017

The purpose of this study was to analyze elementary school teachers' implementation for the emphasis on the revision, major contents, teaching and learning method, and evaluation in the 2009 revised national science curriculum. To fulfill the purpose of this study we carried out a survey with 222 elementary school teachers. Main findings of this research were as follows: First, they highly agreed to the increase in class hours and the application of subject classroom, but they had a lower recognition for setting the subject groups. Second, the degree of necessity in discussion and STS was relatively high, but the degree of implementation in science writing, discussion and STEAM was low. Third, in teaching and learning method, they showed a high performance for mutual cooperation, student-led activities and communication, but, a low implementation for open inquiry and instruction considering individual differences. Fourth, in the evaluation of science learning, they showed a high implementation for evaluation based on achievement standards and one based on the understanding and application of basic concepts, but, a low implementation for the development of common evaluation tools. Fifth, it seemed that their recognition for amount, level and interest of science contents and inquiry activities was appropriate and positive.

• Journal of Microbiology and Biotechnology
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• 제26권1호
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• pp.9-19
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• 2016

Xylanases sourced from different bacteria have significantly different enzymatic properties. Therefore, studying xylanases from different bacteria is important to their applications in different fields. A potential xylanase degradation gene in Massilia was recently discovered through genomic sequencing. However, its xylanase activity remains unexplored. This paper is the first to report a xylanase (XynRBM26) belonging to the glycosyl hydrolase family (GH10) from the genus Massilia. The gene encodes a 383-residue polypeptide (XynRBM26) with the highest identity of 62% with the endoxylanase from uncultured bacterium BLR13. The XynRBM26 expressed in Escherichia coli BL21 is a monomer with a molecular mass of 45.0 kDa. According to enzymatic characteristic analysis, pH 5.5 is the most appropriate for XynRBM26, which could maintain more than 90% activity between pH 5.0 and 8.0. Moreover, XynRBM26 is stable at 37℃ and could maintain at least 96% activity after being placed at 37℃ for 1 h. This paper is the first to report that GH10 xylanase in an animal gastrointestinal tract (GIT) has salt tolerance, which could maintain 86% activity in 5 M NaCl. Under the optimum conditions, K_m, V_max, and k_cat of XynRBM26 to beechwood xylan are 9.49 mg/ml, 65.79 μmol/min/mg, and 47.34 /sec, respectively. Considering that XynRBM26 comes from an animal GIT, this xylanase has potential application in feedstuff. Moreover, XynRBM26 is applicable to high-salt food and seafood processing, as well as other high-salt environmental biotechnological fields, because of its high catalytic activity in high-concentration NaCl.

• 한국초등과학교육학회지:초등과학교육
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• 제26권2호
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• pp.226-241
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• 2007

The purpose of this study was to elucidate elementary school teachers' pedagogical content knowledge regarding the subject of "weight and pressure in water". 6 elementary teachers in charge of the 6th grade were selected for this study. The 7 hour lessons were observed over $15{\sim}20$ days, and a variety of data including scenarios, questionnaires for teachers, interviews of teachers were analyzed. As a result of this study, teachers who had long career histories thought that the purpose of teaching science was to teach the use of science principles, and teachers who had only taught for a relatively short time thought the purpose was satisfying students' curiosity. Most of the teachers felt that the science content knowledge related to buoyancy was insufficient. They had acquired most of the science content knowledge from teaming experiences in middle and high schools. The pre-service teacher education programs didn't help them to satisfactorily acquire the science content knowledge under analysis here. Most of the teachers taught the science lessons according to the order of sequence as shown in the science textbook. They didn't teach the contents that they thought were needed if they were not already included in the science textbook. Only one teacher who had taken science courses in high school managed the science classes freely according to his own thoughts and opinions. From the results of this research, it could be concluded that most elementary school teachers did not have enough pedagogical content knowledge to teach their students effectively.

• 대한지구과학교육학회지
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• 제8권1호
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• pp.25-34
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• 2015

The objective of this study is to clarify how high school students recognize the mental model of the global environment and how they conceptualize the environment. Using the drawing and interview, 25 high school students participated in the survey and were asked to visualize the environmental elements of the global environment and describe the environment they portrayed. The dominant mental model in the present was Mental Model 3: the environment as a place impacted or modified by human activity. Yet, the partial mental model in the future was Mental Model 2: the environment as a place that supports human life. The implications to environmental science education are explored.

• 한국과학교육학회지
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• 제17권1호
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• pp.103-113
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• 1997

The purpose of this study was to identify the preferable learning strategies in science learning and to find out the relationship between these strategies and scientific achievement of students in the secondary school. The learning strategies were tested with two categories, self-focused and work-focused learning. The four types of learning strategies in science learning were analyzed, and they were named to organization, monitoring, elaboration and memorization strategies, which were defined by GSSS test. In the self-focused learning, the organization and monitoring strategies were preferred to the elaboration and memorization strategies. Middle school students had a preference for memorization strategy (p=0.000), whereas high school students had a preference for monitoring strategy (p=0.015). In the case of organization strategy, female groups were preferable to male groups (p=0.027). In the second form of learning types, work-focused learning, the memorization strategy was the same preference as organization and monitoring strategies in the secondary school students, especially the male groups of high school students. The preference of elaboration strategy was relative lower compared with that of self-focused learning type. Middle school students had a preference for monitoring strategy (p=0.001), whereas high school students had a preference for elaboration strategy (p=0.001). The difference of each preference between male and female groups was not shown. From the analysis of correlation between learning strategy and scientific achievement, it showed that the monitoring strategy was commonly correlated with scientific achievement. In the self-focused learning, elaboration and organization strategies were correlated with scientific achievement in high school students (p<0.05). In the work-focused learning, memorization strategy was correlated with scientific achievement in middle school students, especially in male groups (p<0.05).

• 한국진공학회:학술대회논문집
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• 한국진공학회 2006년도 제31회 학술논문발표회 초록집
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• pp.123-123
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• 2006

• 한국영양학회:학술대회논문집
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• 한국영양학회 2001년도 춘계연합학술대회 초록
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• pp.132.1-132
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• 2001

• 센서학회지
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• 제29권1호
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• pp.7-13
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• 2020

Dielectric capacitors are integral components in electronic devices that protect the electric circuit by providing modulated steady voltage. Explosive growth of the electric automobile market has resulted in an increasing demand for dielectric capacitors that can operate at temperatures as high as 400 ℃. To surpass the operation temperature limit of currently available commercial capacitors that operate in temperatures up to 125 ℃, Bi_1/2Na_1/2TiO₃ (BNT), which has a large temperature-insensitive dielectric response with a maximum dielectric permittivity temperature of 300 ℃, was selected. By introducing an intentional A-site cation deficiency and post-heat treatment, we successfully manage to control the dielectric properties of BNT to use it for high-temperature applications. The key feature of this new BNT is remarkable reduction in dielectric loss (0.36 to 0.018) at high temperature (300 ℃). Structural, dielectric, and electrical properties of this newly developed BNT were systematically investigated to understand the underlying mechanism.

• 영재교육연구
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• 제13권1호
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• pp.117-134
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• 2003

21세기를 맞이하여 세계 각국은 과학기술향상을 위한 교육적 측면의 전략들을 새롭게 추진시켜가고 있다. 일본 또한 $\ulcorner$과학기술창조립국$\lrcorner$ 을 지향하고 있는 나라로서 풍요로운 국민생활과 사회경제의 발전 및 산업경쟁력의 강화를 실현시키는 위해 2002년부터 문부과학성에서는 새로운 교육정책인 $\ulcorner$과학기술 이과 애호계획$\lrcorner$ 을 발표하여 현재 추진시키고 있다. 이 새로운 계획의 배경에는 일본의 아동 학생들에게 지적되고 있는 $\ulcorner$이과 싫증 현상$\lrcorner$ 문제가 있다. 이를 우려한 대처방안으로서, $\ulcorner$과학기술 이과 애호계획$\lrcorner$ 은 과학과 친숙하게 하며 이과를 좋아하는 아동과 학생을 증가시켜 과학기술에 관한 관심과 이해를 심화시키기 위해 새롭게 대두된 전략이라고 생각할 수 있다. 그 계획 안에서 가장 주목받고 있는 것이 $\ulcorner$수퍼사이언스고등학교 (SSH . Super Science High School)$\lrcorner$ (이하SSH)에 관한 추진이다. SSH는 과학기술과 이과 수학교육을 중점적으로 실시하는 고등학교로서 이과 수학에 중점을 둔 커리큘럼개발과 대학 및 제연구기관과의 효과적인 연계방법에 대한 연구를 추진하며 장래 유능한 과학기술자를 배출하는데 그 목적을 두고 있다. 본 연구에서는 일본문부과학성의 새로운 적략안에서도 과학 및 수학분야에 대한 영재교육의 일환으로서 언급되어질 수 있는 대표적략 SSH의 추진현황에 대해 소개하며 SSH로 지정된 26개의 고등학교 중 특색있는 추진양상을 띠고 있는 몇사례에 대해 구체적으로 언급하였다. 나아가 어떠한 양상으로 일본의 새로운 교육정책인 SSH가 학교현장을 중심으로 지역에 전개되고 있는가에 대해 주목하고 우리나라의 영재교육과 관련하여 고찰되어야 할 쟁점 및 과제들이 제시되었다.

• 한국비블리아학회지
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• 제28권2호
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• pp.157-183
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• 2017

본 연구는 그림책을 활용한 독서치료 프로그램을 고등학교 부적응 학생을 대상으로 적용하여 학교생활 적응능력에 미치는 효과를 파악하고자 하였다. 경기도 용인시 소재 P고등학교 1, 2학년 학생 중 학교생활 부적응학생으로 파악된 11명의 학생을 대상으로 그림책을 활용한 독서치료 연구를 수행하였다. 연구결과, 학생들의 학교생활 적응능력이 향상되었으며 학교생활 적응능력의 하위요인인 교사관계, 교우관계, 학교수업, 학교규칙 영역에 효과가 있는 것으로 나타났다.