• Journal of The Korean Association of Information Education
• /
• v.23 no.3
• /
• pp.273-282
• /
• 2019

In this study, we have look through the national progress of computer science education in South Korea and analyzed the main subjects and contents of each period. We suggests the ways to evolve the current computer science education in terms of class hours for computer science education, hierarchical instructions, and the limitation of current national curriculum. In South Korea, it has been leaded the computer science education in the world since the it was promoted in earnest since 1995. Based on the recently revised national curriculum, South Korean government are taking efforts to nurture a leader through computer science education in terms of the students' future skills. However, it should be promoted to strengthen the ability of not only problem-solving ability through programming education, but also balanced computing and digital literacy through enhancing the ICT skills. In order to improve the curriculum of computer science education in elementary school of South Korea, a sufficient class hours of computer science education should be secured first.

• Journal of Digital Convergence
• /
• v.16 no.11
• /
• pp.383-392
• /
• 2018

This study investigates convergent factors to TOEIC learning flow among some health college students in TOEIC class. The questionnaire was performed on 255 health college students in TOEIC class from college located in J area from May 1st, 2018 to May. 25th, 2018 by using an unregistered self-administered questionnaire. The hierarchical multiple regression analysis shows the following results. The TOEIC learning flow of respondents turned out to be significantly higher in following groups: a group in which self efficacy is higher, a group in which academic control is higher, a group in which school resilience is higher. The results show explanatory power of 43.4%. As the results of the study, it is necessary to make an effort to increase self efficacy, academic control and school resilience to improve the TOEIC learning flow among health college students. These results can be used in development and operation of TOEIC learning program to higher TOEIC learning flow in health college students. Further studies need the analysis of structural equation model effecting TOEIC learning flow of health college students.

• Proceedings of the IEEK Conference
• /
• 2002.07a
• /
• pp.204-207
• /
• 2002

The current paper proposes a new multispectral image data compression algorithm that can efficiently reduce spatial and spectral redundancies by applying classified prediction, a Karhunen-Loeve transform (KLT), and the three-dimensional set partitioning in hierarchical trees (3-D SPIHT) algorithm In the wavelet transform (WT) domain. The classification is performed in the WT domain to exploit the interband classified dependency, while the resulting class information is used for the interband prediction. The residual image data on the prediction errors between the original image data and the predicted image data is decorrelated by a KLT. Finally, the 3D-SPIHT algorithm is used to encode the transformed coefficients listed in a descending order spatially and spectrally as a result of the WT and KLT. Simulation results showed that the reconstructed images after using the proposed algorithm exhibited a better quality and higher compression ratio than those using conventional algorithms.

• Korean Journal of Child Studies
• /
• v.31 no.2
• /
• pp.119-133
• /
• 2010

The purpose of this study was to examine how the home and classroom literacy environment affect preschool children's story comprehension. The subjects were 213 pairs of children (aged 4-5) and their mothers, and 107 classrooms. The Home Literacy Environment Rating Scale (Park & Kim, 2008), Classroom Literacy Environment Observation Scale (Kim, Kim, Im, & Lee, 2008) and the Children's Comprehension Ability Test (Jung & Kim, 2003) were used in this study. The collected data were analyzed by means of two-way ANOVA, partial correlations, Pearson correlations, hierarchical regressions. Our results indicated that preschool children's story comprehension increases when both home and classroom literacy environment are well resourced and supported. In particular, it is essential that parents spend as much time as possible reading books with their children and that teachers provide children with an amply resourced literacy environment together with appropriate activities in class geared towards story comprehension improvement.

• Korean Journal of Childcare and Education
• /
• v.14 no.2
• /
• pp.19-38
• /
• 2018

Objective: This study explores how pre-service teachers' knowledge changed in the field of movement education and the characteristics of the instruction they perceived during a 15-week course. Methods: The drawing of concept maps and interviews were used to discuss how pre-service teachers' knowledge changed and the characteristics of the course. Results: The results showed that the pre-service teachers interrelated concepts in a more systematic way, and the concepts they used were increased while master concepts were decreased, indicating that their knowledge changed in a far more hierarchical order after the class. Characteristics of the course that led to a change in their knowledge appeared under the proper guidance of a professor. This was well demonstrated by feedback and evaluation at the stage of planning instruction and simulation teaching. Conclusion/Implications: The study demonstrated that the proper guidance of a professor was a useful tool for fostering the professional development of pre-service teachers in regard to constructing knowledge in movement education.

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06a
• /
• pp.174-178
• /
• 2008

P2P를 포함하는 인터넷 애플리케이션 트래픽의 보다 빠르고 정확한 분류는 최근 학계의 중요한 이슈 중 하나이다. 본 논문에서는 기존의 전통적인 분류방법으로 대표되는 port 번호 및 payload 정보를 이용하는 방법론의 구조적 한계점을 극복하는 새로운 대안으로써, 이진 분류기인 SVM과 단일클래스 SVM을 계층적으로 결합한 다중 클래스 SVM을 구축하여 인터넷 애플리케이션 트래픽 분류를 수행하였다. 제안된 시스템은 이진 분류기인 SVM으로 P2P 트래픽과 non-P2P 트래픽을 빠르게 분류하는 첫 번째 계층, 3개의 단일클래스 SVM을 기반으로 P2P 트래픽들을 파일공유, 메신저, TV로 분류하는 두 번째 계층, 그리고 전체 16가지의 애플리케이션 트래픽별로 세분화 분류하는 세 번째 계층으로 구성된다. 제안된 시스템은 flow 기반의 트래픽 정보를 수집하여 인터넷 애플리케이션 트래픽을 coarse 혹은 fine하게 분류함으로써 효율적인 시스템의 자원 관리, 안정적인 네트워크 환경의 지원, 원활한 bandwidth의 사용, 그리고 적절한 QoS를 보장하였다. 또한, 새로운 애플리케이션 트래픽이 추가되더라도 전체 시스템을 재학습 시킬 필요 없이 새로운 애플리케이션 트래픽만을 추가 학습함으로써 시스템의 점증적 갱신 및 확장성에도 기여하였다. 평가항목인 recall과 precision에서 만족스러운 수치 등을 실험을 통하여 확인함으로써 제안된 시스템의 성능을 검증하였다.

• Journal of Korean Institute of Industrial Engineers
• /
• v.3 no.1
• /
• pp.39-47
• /
• 1977

Most of the current literature on inventory theory has been devoted to the study of single stage models. A class of inventory problems which is of great interest is the multistage inventory system which involves a series and hierarchical sequence of stations. This study analyzes some aspect of the series type and multi-stage inventory system, using the fixed cycle ordering which bas a modificatory control function in the system equations. The objective of this study is to clarify the dynamic behavior of the system. The author has derived the theoretical formulas of variation of ordering quantity and stock fluctuation of each stage due to power spectral density function. Influence of parameters such as, (1) intensity of autocorrelation of demand sequence ($\lambda$), (2) forecasting exponential smoothing factors of each stage (${\alpha}_1,\;{\alpha}_2,\;{\alpha}_3$) and (3) production control factor of the 3rd stage ($\gamma$), as operators of the system on the variation of ordering quantity and stock fluctuation of the system. is also clarified. As a result of this study, the relations between the variation of ordering quantity, stock fluctuation and the parameters of the system, have been found. The principles and the theorical analysis presented here will be applicable to more complex type of discrete control systems in constructing the specific condition of the system to minimize inventory variances.

• Korean Journal of Computational Design and Engineering
• /
• v.10 no.2
• /
• pp.133-142
• /
• 2005

This paper proposes an object-oriented conceptual information model of mechanical assemblies, named open assembly model (OAM). The proposed assembly model primarily defines hierarchical relationships between parts and subassemblies. Together with the assembly hierarchy. the model also provides a way to represent tolerances, kinematic information, and parametric assembly constraints. Relational information such as mating conditions and degree of freedom between parts and subassemblies is captured via assembly features and relationships thereof. The information model is described using class diagrams of the Unified Modeling Language (UML), and instance diagrams are used to exemplify the proposed information model. The conceptual model presented in this paper is an integrated information model for assembly representation, which could supply necessary information for tolerance analysis and synthesis, kinematic simulation, and assembly simulation. Such a conceptual information model plays an important role for the exchange of information between modeling, analysis and planning systems. Hence, the proposed model could serve as a framework for developing data exchange standards of mechanical assemblies. The proposed model is demonstrated through a case study of a planetary gear assembly.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.8
• /
• pp.838-842
• /
• 2015

The Li-air battery is a promising candidate for the most energy-dense electrochemical power source because it has 5 to 10 times greater energy storage capacity than that of Li-ion batteries. However, the Li-air cell performance falls short of the theoretical estimate, primarily because the discharge terminates well before the pore volume of the air electrode is completely filled with lithium oxides. Therefore, the structure of carbon used in the air electrode is a critical factor that affects the performance of Li-air batteries. In a previous study, we reported a new class of carbon nanomaterial, named carbon nanoballs (CNBs), consisting of highly mesoporous spheres. Structural characterization revealed that the synthesized CNBs have excellent a meso-macro hierarchical pore structure, with an average diameter greater than 10 nm and a total pore volume more than $1.00cm^3g^{-1}$. In this study, CNBs are applied in an actual Li-air battery to evaluate the electrochemical performance. The formation mechanism and electrochemical performance of the CNBs are discussed in detail.

• Proceeding of Spring/Autumn Annual Conference of KHA
• /
• 2008.04a
• /
• pp.225-230
• /
• 2008

High-rise and high-density apartment complexes has been built and supplied on a large scale in the metropolis and metropolitan areas since 1980s in order to solve housing shortage in cities. Recently they are raising deterioration problems for aging more than 20 years. moreover, those problems show very special characters such as simultaneity and a large scale. The purpose of this study is to propose a direction for the development of the evaluating indicators to measure the level of deterioration of apartments. The level of deterioration of apartments can be evaluated by housing performance. In order to evaluate the deterioration comprehensively, the housing performance indicators should be developed on the social, economical, and physical dimension. This study analyzed the concept of the apartment deterioration and compared housing performance indicators through literature review. First of all, when considering various factors in the evaluation of the deteriorated apartments, such as evaluating ranges, attributes and dimensions, housing performance indicators should be structured with the hierarchical framework. Second, housing performance indicators evaluating the level of deterioration of apartments should include social, psychological, and cultural aspects of home environments in order to understand adequately the attitude of the middle class toward services that apartments provide. Third, in previous researches, most criteria have been developed and weighted based on only expert opinions regarding performance indicators. So, It is necessary to include residents' opinions in developing performance indicators since they can provide more practical and feasible aspects the experts could not experience or understand.