• The Journal of the Korea Contents Association
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• v.20 no.10
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• pp.45-56
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• 2020

This study is about the scale to evaluate the data of the countermeasures in the 'simulation based government exercise' (tentative name). The criteria and weighting of the scale is a standard for evaluating the data of each agency input. This maintains the objectivity and consistency of the evaluation, which complements the subjective evaluation of the observer. Therefore, the criteria should accommodate the purpose of the government exercise evaluation, the possibility of measurement in the simulation environment, the objectivity, no-duplication and causality between criteria, and the grade applying the evaluation results, and the weighting should be set. In this study, three major criteria of timeliness, accuracy, and appropriateness is set up for the evaluation scale and it consists of sub-criteria classified into three classes below respectively and the concept of it was defined. The weighting was calculated by AHP analysis considering the hierarchical structure of it. When this evaluation scale is applied to the 'simulation based government exercise' in the future, it will be possible to secure consistency and objectivity of the evaluation of measures by integrating the quantified evaluation into the observation evaluation and to conduct AAR by scientific techniques.

• Publications of The Korean Astronomical Society
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• v.26 no.3
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• pp.89-101
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• 2011

The International Olympiad on Astronomy and Astrophysics (IOAA) initiated by the Thailand Astronomical Society in 2007 is an annual competition for high school students. One of its aim is to enhance the development of international exchange in the field of school education in astronomy and astrophysics. This paper first provides the overview of the IOAA in terms of key regulations based on its statutes, history and current status. Secondly, the published syllabus of the IOAA is used for content analysis according to subject areas regarding the exam questions of the IOAA in theoretical, observational and data analysis parts from 2007 to 2010. Also, a scientific inquiry framework is applied to the same questions for assessment based on scientific inquiry in the cognitive aspect with two sub-classes of scientific knowledge and scientific reasoning. Among a dozen astronomy subject areas listed on the syllabus, the theoretical part of the IOAA makes more frequent use of the Sun, the solar system, properties of stars, and concept of time. In content knowledge, a factor of scientific knowledge, the IOAA questions, especially in the theoretical part have a lesser degree in difficulty than the IAO (International Astronomy Olympiad) exam questions for the same period whose degree in difficulty is comparable to college level. With regard to scientific reasoning, the IOAA questions tend to involve convergent rather than divergent thinking. Lastly, in light of these findings, discussions are given on the outcome of Korean participation in the previous IOAAs and ways to help better in preparing Korean students for future astronomy Olympiads.

• Journal of Korean Home Economics Education Association
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• v.13 no.3
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• pp.119-130
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• 2001

The purpose of this research is to discover how Practical Reasoning Home Economics Instruction(PRHEI) applied to food and nutrition units would impact on the morality of female high school students. The research sample was drawn from the two freshman classes of \"M\" High School far Girls. located in the Pusan area. One classroom of 50 students was used as the test group and the other of 47 as the control group for the total of 97 students. Measuring the intellectual and behavioral morality scores followed the pre-post test design under which the PRHEI was administered to the test group during the period of eight weeks in a semester. Whereas the control group received the conventional lecture-oriented instruction during the same period. The effects of PRHEI on morality were measured using the system developed in 1972 by Ontario Institute for Studies in Education. and translated by Kim. Ahn-Jung in 1982. The system developed by Yang. Byung-Han in 1994 was utilized to measure the behavioral morality score. In analyzing the collected data. SPSS/WIN was used to generate means standard deviation and t-test. The research findings are as follows : First. The students who have been taught under the PRHEI score higher on the intellectual morality scale than the control group receiving the lecture-oriented instruction. Second. The test croup students do not show any notable differences from the control group students receiving the lecture-oriented approach on the behavioral morality scale; however, the former do show statistically significant differences from the latter in the sub-factor of honesty scoring higher means over the control group.

• Journal of the Earthquake Engineering Society of Korea
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• v.14 no.4
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• pp.23-28
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• 2010

This study evaluated the effect of vibration, level of lateral yielding strength, site conditions, ductility factor, strain-hardening ratio, and post-capping ratio of the strength limited bilinear SDF systems on the inelastic displacement ratio. The nonlinear response history analysis was conducted using 240 ground motions which were collected at the sites classified as site classes B, C, and D according to the NEHRP. To account for the P-$\Delta$ effects, this study considered negative stiffness ratios ranging from -0.1 to -0.5 of elastic stiffness. Four different damping ratios are used: 2, 5, 10, and 20%. From this study, an equation of inelastic displacement ratio was proposed using nonlinear regression analysis.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.4
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• pp.399-407
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• 2011

This study analyzes the performance of hybrid power systems combining a solid oxide fuel cell (SOFC) and a gas turbine (GT). Research focus is given to the influence of the size-dependent gas turbine performance on hybrid system performance. Three hybrid systems adopting different gas turbines (kW, sub-MW, multi-MW classes) are designed. As the gas turbine power increases (i.e. as the gas turbine performance enhances), the gas turbine power portion increases and the hybrid system efficiency increases. The hybrid system shows efficiency improvement over the SOFC only system even in the case where the gas turbine net power is nearly zero. The increase of gas turbine pressure ratio contributes to the net hybrid system power output in all of the three cases, while system efficiency is almost independent on the pressure ratio.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.6
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• pp.221-227
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• 2013

This paper proposes an improved steganalysis method based on image categorization. In general, most steganalysis methods extract the statistical moments based features which contain the global natures of images regardless of their inherent characteristics. However, the steganalysis method based on the statistical moments leads to degraded performance by applying to images with different complexity. In this paper, we decompose an 8-bit image into an upper 4-bit plane and a lower 4-bit plane, and categorize the image with two classes according to the correlation coefficient between decomposed sub-images. Two independent steganalyses can be performed for the categorized images. Since our method uses independent steganalysis technique according to the image category, it can reduce the drawback of the steganalysis methods utilizing the statistical moments. The performance of the proposed scheme is compared with well-known four steganalysis methods. Experiment results show that the proposed scheme has higher detection rate than previous methods.

• Journal of the Korean Chemical Society
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• v.59 no.1
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• pp.69-77
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• 2015

The purpose of this study was to examine changes in student writings of claim and evidence after group and class discussions; changes in students' critical thinking; and students' perceptions on an argument-based claim and evidence writing approach. Seventy two grade 11 students from two classes of a high school located in Seoul participated in ten chemistry activities using the argument-based claim and evidence writing approach. Claim scores for 9 topics and evidence scores for 10 topics significantly improved after group discussion. There were also statistically significant differences in claim scores for 7 topics and evidence scores for 10 topics after class discussion. Participant students responded to an open-ended survey that group discussion helped them to figure out the problem context and class discussion guided them to provide with more sufficient evidence. There were also statistically significant increases in sub-scores of the Cornell Critical Thinking Test after the intervention.

• Journal of the Korean Society of Earth Science Education
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• v.6 no.3
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• pp.252-260
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• 2013

The purpose of this study is find out the correlation of level of knowledge of pre-service elementary teacher with space perception ability on 'Earth and Space' of elementary science. During the second semester of 2013, for 15 weeks, the classes were conducted for 3 hours per week and we find out knowledge Understanding degree and select terms offered by 5th grade science courses 'The solar system and the stars', 'Earth and Moon', 'change of seasons' section and measured space perception ability degree of pre-service elementary school teacher with a questionnaire. We analyzed the correlation of understanding level of knowledge in the field of astronomy of pre-service elementary school teacher with space perception ability. The results of the study are presented as follows. First, pre-service elementary school teacher showed a low level of knowledge understanding as it goes the upper grades about upper concept in 'The solar system and the stars', 'Earth and Moon', 'change of seasons' section' of astronomy area of elementary science 'Earth and space sector'. The pre-service elementary school teachers needs to acquire knowledge of astronomy area in elementary school curriculum. Second, pre-service elementary school teacher showed that there are differences individually in 'finding solid body' of sub-element of space perception ability. This shows that 'finding solid body' factor is associated with space perception ability. Third, in the section of 'The earth and the Universe' for elementary education, 'Reflection' and 'Finding solid body' which are low-level components of space perception ability were verified that have a corelationship with general grades in the astronomy conception test.

• Korean Journal of Childcare and Education
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• v.7 no.3
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• pp.211-238
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• 2011

This study examined the effects of drama play activities on child's initiativeness. The participants were 34 five-year-old children in two classes of a child care center. Before the experiment, the initiativeness test was conducted on the children of the experiment and control groups. initiativeness was categorized into emotional ability, communication skills, and achievement motivation. Drama play activities were directed to the children of the experiment group while the existing program was applied to the control group. After the experiment, both the experiment and control groups took the post-test. Analysis of data was performed by ANCOVA. According to the result of the research, children of the experiment group participated in drama play activities showed more effects in all sub area of initiative including emotional ability, communication skills, and achievement motivation than children of the control group. This result implied that dramatic play activities are effective teaching-learning method for enhancing child's initiativeness.

• Journal of the Korean Applied Science and Technology
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• v.32 no.1
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• pp.16-22
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• 2015

Alkaloids of Vinca minor L. were characterized by HPLC equipped with the photo diode array detector and compared their UV/vis absorption spectra with an index material such as vincamine. UV/vis absorption spectra of more than 9 compounds belong to various classes such as flavonoids were shown and characterized. Extracts with ethanol or hot water were tested against the DPPH (2,2-diphenyl-1-picrylhydrazyl) free-radical to investigate their antioxidant activity. Based on the results, those extracts show about 14-15% of antioxidant activity of quercetine and vitamin C used as standards.