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- 저자 : 김경성 ( Kyung Sung Kim ) (검색결과 35 건)
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김경성 ( Kyung Sung Kim ),김종훈 ( Jong Hoon Kim ),곽현석 ( Hyun Seok Kwak ) 서울교육대학교 초등교육연구원 2013 한국초등교육 Vol.24 No.3
The major purpose of this study is to explain the general cases of two way analysis of variances with unbalanced cell size and/or missing cells. In the statistical text book contains only special cases of a research, for example, which all research group sizes are equal. Of course, in that cases all computational procedures can be performed manually. But in the real data from research field, the data for ANOVA are not balanced. Hence it is extremely difficult to compute statistics by hand. Of course, SPSS or SAS, a famous commercial statistical packages, can easily compute the statistics but the algorithm is not easy for social scientist, who are not familiar with mathematics or statistics, to understand. Therefore, the general cases of ANOVA can be explained by GLM (General Linear Model) effectively. There are three different examples were utilized: (1) balanced, (2) unbalanced and (3) unbalanced with missing cell. Each example contains a fictitious data set, matrix notations and step by step computational procedure. Based on the GLM algorithms, a FORTRAN program were made for the analysis of some general cases of ANOVA. And this research can be extended the multivariate analysis of variance.
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김경성 ( Kyung Sung Kim ),이수영 ( Soo Young Lee ),전우천 ( Woo Chun Jun ),김혜숙 ( Hye Sook Kim ),곽현석 ( Hyun Seok Kwak ),김종훈 ( Jong Hoon Kim ),서정희 ( Jung Hee Seo ) 서울교육대학교 초등교육연구원 2011 한국초등교육 Vol.22 No.3
The purpose of this study is to evaluate the ICT Literacy of primary and secondary school students in South Korea. ICT literacy was defined with six competencies namely to define, access, evaluate, create, manage, and communicate. Web-based multiple choice tests and performance tests were conducted at the Core level and the Advanced level depending on student age. 12,165primary school students (from fourth to sixth grade, core level) and 14,669 secondary school students(from seventh to ninth, advanced level) took the test. The ICT literacy levels were categorized as ``below basic``, ``basic``, ``proficient``, ``excellent`` using the bookmark method. The results of this study are summarized as follows. The average score of the Core level test was 57.41(scaled score of 100 points, SD=6.41), the average score of the Advanced level test was 59.91, SD=6.65). In both the Core and Advanced level tests, higher grade students had higher average scores. Especially, in Core level, for high grade students, for those living in big cities, for female students, ratio of proficient and excellent is higher. This result is statistically meaningful. In Advanced level, for high grade students, for female students, and for those living in small and medium-sized cities rather than towns have high ratio of proficient and excellent. This can be also interpreted as statistically meaningful.
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김경성(Kyung Sung Kim),박동우(Dong-Woo Park) 한국해양공학회 2017 한국해양공학회지 Vol.31 No.6
A Lagrangian approach based computational fluid dynamics (CFD) was used to simulate large and/or sharp deformations and fragmentations of interfaces, including free surfaces, through tracing each particle with physical quantities. According to the concept of the particle-based CFD method, it is possible to apply it to both fluid particles and solid particles such as sand, gravel, and rock. However, the presence of more than two different phases in the same domain can make it complicated to calculate the interaction between different phases. In order to solve multiphase problems, particle interaction models for multiphase problems, including surface tension, buoyancy-correction, and interface boundary condition models, were newly adopted into the moving particle semi-implicit (MPS) method. The newly developed MPS method was used to simulate a typical validation problem involving dam breaking. Because the soil and other particles, excluding the water, may have different viscosities, various viscosity coefficients were applied in the simulations for validation. The newly developed and validated MPS method was used to simulate the mobile beds induced by broken dam flows. The effects of the viscosity on soil particles were also investigated.
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Likert 척도의 반응범주 수(3, 4, 5, 6단계)에 따른 초등학생용 심리검사의 신뢰도 비교
김경성 ( Kim Kyung Sung ),곽현석 ( Kwak Hyun Seok ) 서울교육대학교 초등교육연구원 2020 한국초등교육 Vol.31 No.1
The purpose of this study is to examine whether the reliability of psychological tests in elementary students differs according to the number of response categories on the Likert scale. To this end, 3, 4, 5, and 6-point scales of the Likert scale response categories were tested on a total of 2,639 3<sup>rd</sup> to 6<sup>th</sup> grade students in 14 elementary schools in Seoul and Gyeonggi-do province. The SPSS 23.0 program was used to estimate the reliability coefficient, the Cronbach α coefficient, which is the most popular in social science research, and the cocron r package has been utilized for the comparative test. There were differences between the 3 and 5-point scales in the school adaptation test, and the 3 and 5-point scales, the 4 and 5-point scales in the anxiety and depression test. In the 3-4 grade group, there were also differences between the 3 and 5-point scales in the school adaptation test, and in the 5-6 grade group, there were differences between the 3 and the 5-point scales in the anxiety and depression test. In grades 5<sup>th</sup> and 6<sup>th</sup>, both tests showed statistically significant differences between the 3 and 4-point scales. Testing the statistical significance with the control group according to the neutral reaction, there was no statistically significant difference in the school adaptation test, and there was a statistically significant difference in the overall grade in the anxiety and depression test. As a result, the context of items by test tools, the content of items, the number of items, the examinees' disposition and training level, education and test motivation and cognition level, and the data analysis plan after the test should be considered. It seems desirable to use a five point scale. Through this study, we can refer to how the Likert response category fits the development stage of elementary school students in order to increase the reliability of the test when producing the survey or the psychological test.
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김경성(Kyung-Sung Kim) 한국항해항만학회 2018 한국항해항만학회 학술대회논문집 Vol.2018 No.추계
일반적인 댐 붕괴 시뮬레이션은 개수로 등 범람원을 대상으로 시뮬레이션 및 해석이 이루어졌다. 그러나 지속적인 이상기온 등으로 인하여 해안가 및 해양에서도 쓰나미 혹은 해일과 같은 규모가 큰 파가 발생하고 이에 따른 피해가 발생하고 있다. 규모가 크며 격렬한 파는 일반적인 전산유체역학 방식으로 해석이 가능은 하지만 자유표면의 대-변형 및 쇄파 등에 의한 비선형성의 시뮬레이션은 격자라는 한계에 의해 제한적으로 사용되어졌다. 이에 라그란지안 접근법을 이용한 입자법을 도입하여 댐 붕괴와 같은 격렬한 자유표면의 변동을 포함한 문제를 재현하였으며, 이러현 격렬한 파동에 의한 바닦면의 교란을 시뮬레이션 하였다. In general, the dam break problem is demonstrated to simulate open-channel disturbance due to large violent waves. These days, the large violent waves at shore and coastline can be seen frequently such like tsunami. The conventional computational fluid dynamics program based on Grid system, can be used to simulate this problem with large deformation of free surface in the restricted condition due to its limitation. The particle method based on fully Lagrangian approach is able to simulate large deformation of free surface by tracking each particles. In this study, the simulation of disturbance of mobile-bed due to large violent waves was investigated by using particle method.
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