• 대한지구과학교육학회지
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• 제5권3호
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• pp.267-275
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• 2012

The purpose of this study is to find out the effect of the role-playing analogy activity-based class on the academic achievement in science and the science process skills of elementary school students. One experimental group and one control group of 4th grade students were selected to perform a prior investigation on the academic achievement in science and the science process skill. Then the experimental group attended science lessons that were based on the role-playing analogy activity and the control group attended the traditional science lessons based on the text book and teacher's guide. After conducting lessons, a post investigation was performed for each group and the results were analyzed to produce the following conclusions. First, the role-playing analogy activity class was more effective to improve students' academic achievements than the traditional science class. And the role-playing analogy activity class was more effective to learners in the high-level group, which made a scores above the average in prior investigation on the academic achievement, whereas it was little effective to those in the low-level group. Second, the role-playing analogy activity class was effective to enhance students' science process skills than the traditional science class. And the role-playing analogy activity class was more effective to the learners' in the high-level group than those in the low-level group.

• 한국과학교육학회지
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• 제15권1호
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• pp.116-125
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• 1995

This study is to consider hypotheses with integral view on the respect of creative thinking. Subjects of this study are Korean students in the 5th grade who participated in the Field Trip Contest of the second Korean Youth Science Festival, an openended inquiry investigation. Objectives of this study are as follows: 1) to measure the inquiry level of the Field Trip Contest activity 2) to find how many hypotheses were made on different types in the inquiry investigation 3) to measure the quality level of hypotheses made in the scientific inquiry investigation 4) to find out the correlation between the 1st and 2nd hypotheses and the final activity score in the two staged scientific investigation In the consequence of it, inquiry level of the Field Trip Contest was very high with good activity topics and openended way of investigation. Hypotheses were made in the prediction, plan, and conclusion parts in the field trip activity report. They used hypothesis-as-prediction typed statements(3.41/team) more than hypothesis-as-explanation(1.28/team) and descriptive hypothesis(0.03/team) types. Content-related hypothesis(5.03/team) and process-related hypothesis(6.16/team) were usually coupled each other. Most of them had difficulties in hypothesis-from-evidence(0.31/team, 10/32 teams) in the comparison of hypothesis-from-simple conjecture(10.62/team). The quality level of content-related hypotheses(0.74point/statement) and process-related hypotheses(1.98point/statement) were very low by the hypothesis-quality scale(Quinn and George, 1975) for the content-related hypotheses and the process-related hypothesis quality scale developed in this study. There was considerable correlation between the activity score and the 1st and 2nd hypothesis in the 2 staged inquiry investigations with the 2nd and 3rd topics($0.41{\ast}$, $0.59{\ast}{\ast}$ repectively).

• 대한의생명과학회지
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• 제13권3호
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• pp.169-173
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• 2007

[ $^{31}PNMR$ ] spectroscopy revealed the adenylate kinase-like activity and the phosphotransferase activity from $F_1-ATPase$ of Escherichia coli. Incubation of $F_1-ATPase$ with ADP in the presence of $Mg^{2+}$ shows the appearance of $^{31}P$ resonances from AMP and Pi, suggesting the generation of AMP and ATP by adenylate kinase-like activity and the subsequent hydrolysis to Pi. Incubation of $F_1-ATPase$ with ADP in the presence of methanol shows additional peak from methyl phosphate, suggesting phosphotransferase activity of $F_1-ATPase$. Both adenylate kinase-like activity and the phosphotransferase activity has not been reported from $F_1-ATPase$ from Escherichia coli. $^{31}P$ NMR proved that it could be a valuable tool for the investigation of phosphorous related enzyme.

• Journal of Information Science Theory and Practice
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• 제8권3호
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• pp.47-63
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• 2020

This study focuses on users of activity tracking technologies and their related information behavior. How useful is the provided information by the trackers? Do users understand all information and explanations? We conducted a web-based survey. All in all, 631 users of a tracking device filled out the survey. From the perspective of information science, this investigation aims to analyze information needs considering different types of the provided information by activity tracking technologies. Are users satisfied by using the information on their steps, heart rates, and sleep duration? How do users assess readability about heart rate zones and sleep stages? Additionally, we investigated if users understand how to reflect on and adapt their health behavior based on the received explanations. According to the results, users mainly agree that the received information (raw data as well as - to a lesser extent - aggregated data in the form of corresponding diagrams) is useful, that the explanations are easy to understand, and that they know how to use this obtained information. This investigation enables an in-depth insight into how users are applying the self-quantifying activity and health information and which information needs are satisfied.

• 한국과학교육학회지
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• 제31권2호
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• pp.210-224
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• 2011

이 연구의 목적은 2007 개정 교육과정에 새롭게 도입되는 자유 탐구 활동이 중학생의 과학 탐구능력에 미치는 영향을 알아보고 그와 함께 자유 탐구 수행에 대한 학생들의 인식을 분석해 보고자는 것이다. 연구를 위하여 중학교 1학년 여학생 8개 학급 262명을 연구 대상으로 4개 학급은 자유 탐구 활동을 실시하고 4개 학급은 전통 수업을 실시하였다. 리커트 설문조사에 의하면 학생들은 자기 주도적으로 탐구활동을 하며 모둠별 탐구 활동과 토의 활동을 통해 협동성을 배우고 있고 자유 탐구 활동을 그다지 어렵지 않은 활동으로 생각하였다. 또한 자유 탐구 활동이 과학 공부에도 도움이 되고 흥미롭고 재미있는 활동이라는 긍정적인 반응을 보였다. 그러나 자유 탐구 활동이 잘하는 1~2명에 의해 이루어진다거나 방과 후 시간 여유가 없어 모둠원이 함께 모이는 것 자체에 어려움을 겪는 등 자유 탐구 활동의 운영에 있어 문제점과 어려움이 있는 것으로 나타났다. 자유 탐구 활동은 중학생의 과학 탐구능력 신장에 유의미한 영향을 주지 않았다. 통합탐구능력 향상 역시 유의미한 차이의 영향을 주지 않았으나 기초탐구능력 향상에는 유의미한 차이의 영향을 주었다. 특히 기초탐구능력의 하위 요소 중 예상 능력을 향상시켰다.

• 보존과학연구
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• 통권13호
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• pp.96-112
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• 1992

We made biological investigation on the conservational environment of collections in the Ho Am museum. Annual average temperature and relative humidity outside the museum were $11. 0∼11.7^{\circ}C$ and 64.8∼74.4% respectivey. On the other hand, average annual temperature and relative humidity inside the main storage were $19.1∼20.1^{\circ}C$ and 53.0∼63.4%. We isolated fungi and classified into 8 genus 13species fungi and selected four fungi having high cellulotic activity such as Alternaria brassicae KCPRI 9202, Aspergillus niger KCPRI 9205, Aspergillusversicolor KCPRI 9206, Penicillium adametzi KCPRI 9208. These fungi were examined on the posibility of collections being damaged under current conservation al environment in the museum. KCPRI 9208 was non-tonophilic fungus and other were facutative tonophilic fungi. These showed maximal cellulotic activity of enzymeshaking culture at pH 5.0∼5.5 for 4 and 5 days. In proprtion to the period damaged, cellulase activity for paper damaged artifically with growing worse of material. As are sult cellulotic activity by fungi increased.

• 한국지구과학회지
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• 제32권2호
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• pp.225-238
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• 2011

이 연구는 교실상황에서 실현되는 성공적인 탐구활동을 위한 중요한 변수에는 무엇이 있으며 또한 학생들이 실시하는 과학탐구의 실행능력은 그 수준 정도가 어떻게 되는지를 조사하였다. 이 연구를 위해서 7학년 및 8학년의 과학 영재학생들이 설문지를 작성하고 과학탐구의 실행능력 평가를 위해 탐구문제제기 및 탐구설계를 직접적으로 할 수 있도록 하였다. 설문지는 성공적인 과학탐구 활동에 영향을 주는 요소를 개인적 및 상호적 변수로 나눠 파악하였으며, 240명의 과학영재학생들이 설문에 응답하였다. 이 외에 두 개의 다른 질문지에는 탐구문제를 제기할 수 있는 능력과 탐구설계과정 능력을 측정할 수 있는 문항이 포함되어 있었다. 결과는 다음과 같다. 개인적 변수로는 그룹활동 및 탐구 활동을 잘 할 수 있다는 확신과 과학탐구 가치를 높이 평가하고 있는 학습동기가 중요한 변수로 파악되었다. 또한 학생들의 성공적인 탐구활동에는 상호성 변수에는 그룹 편성, 과제종류, 물리적 환경, 그리고 교사의 역할이 중요한 성공 변수로 파악되었으며, 특히 그룹 편성은 학생들이 그룹탐구활동을 하는데 있어서 가장 중요하게 생각하는 변수로 파악되었다. 하지만 학생들의 탐구문제를 개발하는 능력이나 탐구설계를 하는 능력은 제한적으로 나타났다.

• Fisheries and Aquatic Sciences
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• 제11권1호
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• pp.1-6
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• 2008

In an effort to discover an alternative therapeutic agent against methicillin-resistant Staphylococcus aureus (MRSA), several medicinal plants and seaweeds were evaluated for its antibacterial activity against MRSA. A methanolic extract of the Phaeophyta Ecklonia stolonifera exhibited significant antibacterial activity against MRSA. To perform more detailed investigation on antibacterial activity, the methanol extract of E. stolonifera was further fractionated with organic solvents such as hexane, dimethylchloride, ethyl acetate, and n-butanol. Among them, the hexane fraction showed the strongest antibacterial activity against MRSA strains with MIC from 500 to $600 {\mu}g/mL$. The fraction also exhibited a bactericidal activity against MRSA, indicating that E. stolonifera contains a bactericidal substance against MRSA.

• 한국응용과학기술학회지
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• 제32권3호
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• pp.363-371
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• 2015

n-Butanol and ethyl acetate extracts of thermal treatment yam (Dioscorea batatas $D_{ECNE.}$) belonging to the family Dioscoreaceae were measured for their radical scavenging activity and lipid peroxidation inhibition ability. In this study, ethyl acetate extract showed the most potent antioxidant activity evaluated by ferrous ion chelating activity and NO radical scavenging activity. Nevertheless, n-butanol extract was more effective in inhibiting linoleic acid peroxidation. A significant difference between n-butanol extract and ethyl acetate extract in nitrite scavenging activity ${\beta}$-carotene bleaching assays could not be found. Also, the results of this study showed that thermal treatment yam could be used as easily accessible source of natural antioxidants and as a possible food supplement.

• 한국식품영양과학회지
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• 제23권5호
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• pp.827-831
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• 1994

Investigation on the extractability, Mg2+-, Ca2+ , EDTA-ATPase activity and solubility of actomyosin prepared from leg and breast muscle of silky fowol were as follows. The extractability of actomyosin in leg and breast muscle was 779mg/100g and 1, 318mg/100g respectively, breast muscle was higher than leg muscle . Mg2+-ATPase activity of actomyosin was high inionic strength 0.02-0.10 and Mg2+ATPase activity of low ionic strength was higher than high ionic strength not related to the part. Ca2+ ATPase activity was high in ionic strength 0.05-0.13, the activity of leg muscle was higher that breast muscle. And EDTA-ATPase activity showed low in low ionic strength and showed high in high ionic strength, and increased greatly depend ionic strength up to 0.4. The solubility of actomyosin was not different in leg and breast muscle , the solution started in KCI concentration of 0.3M and ended in DCI concentration of 0.4M.