• 한국초등과학교육학회지:초등과학교육
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• 제19권1호
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• pp.85-99
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• 2000

Researches have shown that learning science frequently requires the process of conceptual change. As a result, many of the constructivist teaching and loaming approaches focus on this kind of loaming. In approaches that focus on conceptual change, cognitive conflict strategies play a key role. Students, however, still have much difficulty in loaming science. Theoretically, it underlies Piaget's genetic epistemology in which disequilibration demands an interplay between assimilation and accommodation until equilibrium is restored. Also, radical constructivism has its roots in a variety of disciplines, but has been most profoundly influenced by the theories of lean Piaget as interpreted and extended by Glasersfeld. This study is intended to interpret the conceptual change from radical constructivist perspective and explain difficulties of conceptual change which students have in learning science.

• 한국보육지원학회지
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• 제10권1호
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• pp.59-79
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• 2014

본 연구는 유아교사들을 대상으로 행복 교육에 대한 개념도 분석을 실시하여 행복 교육에 대한 가능성과 지침을 제안하는 데 목적이 있다. 본 연구의 연구대상은 유치원과 어린이집에 근무 중인 유아교사 각 50명씩 100명을 대상으로 선정하였다. 유아교사가 작성한 개념도는 상위개념의 수, 내용요소에 따른 수, 특성, 위계, 밀도 등의 측면에서 분석하였다. 첫째, 유아교사의 행복 교육에 대한 내용에서 유치원 교사들이 사용한 상위개념의 개수는 총 364회로 나타났으며, 총 21개의 상위개념 범주로 도출하였다. 둘째, 유아교사의 행복 교육에 대한 내용에서 어린이집 교사들이 사용한 상위개념의 개수는 총 296회로 나타났으며, 총 18개의 상위개념 범주로 도출하였다. 본 연구의 결과를 통해 유아교사의 행복 교육의 개념에 대한 지식을 체계화하고 전문화된 지식체계로 발전하기 위한 지원이 필요함을 시사한다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 추계학술발표회논문집(1)
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• pp.289-294
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• 1996

Feasibility study on conceptual design tool for liquid metal reactor has been conducted to optimize the thermohydraulic and neutronic design parameters. To accomplish this task the neutronic code PRISM, fuel performance code and scaling method have been included into the conceptual design support system. ALMR(PRISM 303MWe) has been adopted as the reference plant and principally according to the power level, conceptual design parameters are optimized so that energy balance and neutronics balance seem to be satisfied. This paper presents only the results of optimization on primary system including the IHX system.

• 한국지능시스템학회논문지
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• 제17권1호
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• pp.123-129
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• 2007

On the Semantic Web, the content of the documents must be explicitly represented through metadata in order to enable contents-based inference. In this study, we propose a mechanism to convert the Conceptual Graph (CG) into Resource Description Framework (RDF). Quite a large number or representation languages for representing knowledge on the Web have been established over the last decade. Most of these researches are focused on design of independent knowledge description. On the Semantic Web, however, a knowledge conversion mechanism will be needed to exchange the knowledge used in independent devices. In this study, the CG could give an entire conceptual view of knowledge and RDF can represent that knowledge on the Semantic Web. Then the CG-based object oriented PROLOG could support the natural inference based on that knowledge. Therefore, our proposed knowledge conversion mechanism will be used in the designing of Semantic Web-based knowledge representation and inference systems.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제8권2호
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• pp.81-93
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• 2004

This study investigated three preservice teachers' mathematical problem solving among hand-in-write-ups and final projects for each subject. All participants' activities and computer explorations were observed and video taped. If it was possible, an open-ended individual interview was performed before, during, and after each exploration. The method of data collection was observation, interviewing, field notes, students' written assignments, computer works, and audio and videotapes of preservice teachers' mathematical problem solving activities. At the beginning of the mathematical problem solving activities, all participants did not have strong procedural and conceptual knowledge of the graph, making a model by using data, and general concept of a sine function, but they built strong procedural and conceptual knowledge and connected them appropriately through mathematical problem solving activities by using the computer technology.

• 한국영어학회지:영어학
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• 제2권4호
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• pp.471-494
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• 2002

May(1985) argued that the regress problem of antecedent-contained deletion (ACD) construction could be resolved easily by positing QR. But the proposal has some conceptual and empirical problems. To resolve the problems of QR account on ACD, Hornstein(1994) suggested a new approach viz. LF A-movement approach. In the Minimalist framework, an object raises to the [Spec, Agro] to check the accusative case. Through this movement, the regress problem can be resolved naturally without QR. But the LF A-movement account has the same conceptual problem as the QR approach. In addition to the conceptual problem, it has also empirical problems which were pointed out by Kennedy(1997). To solve the problems, I propose that the object raise to [Spec Agro] overtly as Koizumi(1993, 1995) and Lasnik(1995) insisted. In addition to the proposal, I adopt another assumption that only the copy of a quantifier could become a variable by the vehicle change, which was suggested by Brody(1995). With the above proposals, the unnatural QR operation could be dispensed with and the conceptual and empirical problems which were made concerning the LF A-movement approach could be resolved.

• International Journal of Aeronautical and Space Sciences
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• 제6권1호
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• pp.89-96
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• 2005

Ducted fans have advantages in noise as well as operational safety aspects compared to conventional tail rotors and are used as an anti-torque system for various classes of helicopters. The final goal of this study is to develop a ducted fan anti-torque system which can replace conventional tail rotors of existing helicopters to achieve safety enhancement and low noise level. In this paper, a conceptual design process and the results are described. Initially, the design requirement and the design parameter characteristics are analysed, and then initial sizing and configuration design are performed. There are several configuration changes due to specific technical reasons in each case. Finally, the required power and the pitch link load are predicted as an initial estimation. The conceptual design technique for the ducted fan in this study can be easily applied to the design of other ducted fans such as the lift fan for unmanned aerial vehicle.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2006년도 추계학술대회 학술발표 논문집 제16권 제2호
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• pp.314-317
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• 2006

This study proposes an ontology design framework to support the cooperation among devices by using PROLOG, Conceptual Graph (CG), and Resource Description Framework (RDF). Quite a large number of representation languages for representing ontology on the Web have been established over the last decade. Most of these researches are focused on design of independent resources description. In Semantic Web, however, cooperation ontology will be needed. In this study, the CG could make an entire conceptual view of knowledge and RDF can represent that knowledge. Then the PROLOG could support the natural inference based on that knowledge. Therefore, our proposed ontology will be used in the designing of Semantic Web-based cooperation systems.

• Korean Journal of Mathematics
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• 제27권3호
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• pp.743-765
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• 2019

Conceptual and procedural knowledge of integration is necessary not only in calculus but also in real analysis, complex analysis, and differential geometry. However, students show not only focused understanding of procedural knowledge but also limited understanding on conceptual knowledge of integration. So they are good at computation but don't recognize link between several concepts. In particular, Riemann sum is helpful in solving applied problem, but students are poor at understanding structure of Riemann sum. In this study, we try to investigate understanding on conceptual and procedural knowledge of integration and to analyze errors. Conducting experimental class of Riemann sum, we investigate the understanding of Riemann sum structure and so present the implications about improvement of integration teaching.

• 보건행정학회지
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• 제13권2호
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• pp.44-66
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• 2003

I. Background and Purpose Health Indicator system and measurement of health status are an important fields in national health fields. This study reviewed the overall concepts of health and health indicators, health indicator system. The purposes of this study are to build the conceptual health framework, and suggest a health indicator system, in order to correspond to the situation of national health and the demand of International organizations. II. Scope and Contents The scope of this study ; - Review of tile conceptual health framework, health indicators, and health Indicator system - Selection and development of tile new individual health indicators - Suggestion of tile revised health indicator system III. Results of Study This study intented to build the conceptual and framework of national health and provide the measurement tools of health status. This study developed the health indicator system through the conceptual and hierarchial approach to national health. The health indicator system contains 6 concern: areas and each sub-areas. The major concern areas are health state and behavior, deathㆍdiseaseㆍdisability, health care utilization, health resources, health expenditure and finance, other affecting factors on health. This health indicator system is corresponding to the situation of health status patterns and the demand of international organizations. And this health indicator system is considering the present health data production system and the availability of health data.