• 정보교육학회논문지
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• 제23권3호
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• pp.273-282
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• 2019

본 연구에서는 우리나라의 컴퓨터교육의 국가적인 추진 경과를 분석하여 시기별 추진 주체와 주요 내용에 대한 분석을 실시하였다. 이를 토대로 2015개정교육과정을 통해 적용되고 있는 소프트웨어교육의 제한점과 차기교육과정 개정 논의에서 반영되어야할 시수와 내용체계를 비롯하여 교수학습내용의 위계를 구성하는 방안을 제시하고 있다. 우리나라의 경우 사실상 1995년부터 본격적인 컴퓨터교육이 추진되었다는 점에서 세계적으로 선도적으로 시행되었다고 할 수 있으며, 최근 개정된 교육과정을 기반으로 컴퓨터교육을 통한 미래인재를 양성하기 위한 노력을 통해 교육에서의 선도적인 역할을 수행하기 위한 노력을 경주하고 있다. 다만, 프로그래밍 교육을 통한 문제해결력 신장뿐만 아니라 컴퓨팅에 대한 소양능력을 강화하여 균형있는 컴퓨터교육의 역량이 강화될 수 있도록 추진되어야 하며, 이를 위한 충분한 시수가 확보되어야 할 것이다.

• 디지털융복합연구
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• 제16권11호
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• pp.383-392
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• 2018

본 연구는 보건계열 일부 대학생의 토익 학습몰입과 관련된 융복합적 요인들을 조사하였다. 설문조사는 2018년 5월 1일부터 2018년 5월 25일까지 J지역에 소재한 대학의 보건계열 토익학습반에서 임의로 선정된 대학생 255명에 대하여 무기명 자기기입식 설문지를 사용하였다. 위계적 다중회귀분석 결과, 자기효능감이 높을수록, 학업통제감이 높을수록, 학교적응유연성이 높을수록 토익 학습몰입이 높았으며 이들의 설명력은 43.4%이었다. 연구결과를 볼 때, 보건계열 대학생의 토익 학습몰입을 높이기 위해서는 자기효능감, 학업통제감 및 학교적응유연성을 높이는 노력이 필요하다. 이러한 결과는 보건계열 대학생의 토익 학습몰입을 높이는 토익학습 프로그램 개발 및 운영에 활용될 수 있다. 추후연구에서는 보건계열 대학생의 토익 학습몰입에 영향을 미치는 구조방정식 모형의 분석이 필요하다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.204-207
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• 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.

• 아동학회지
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• 제31권2호
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• pp.119-133
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• 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.

• 한국보육지원학회지
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• 제14권2호
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• pp.19-38
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• 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.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2008년도 한국컴퓨터종합학술대회논문집 Vol.35 No.1 (A)
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• pp.174-178
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• 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.

• 대한산업공학회지
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• 제3권1호
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• pp.39-47
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• 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.

• 한국CDE학회논문집
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• 제10권2호
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• pp.133-142
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• 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
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• 제39권8호
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• pp.838-842
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• 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.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년도 춘계학술발표대회 논문집
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• pp.225-230
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• 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.