• 한국수학교육학회지시리즈D:수학교육연구
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• 제15권1호
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• pp.15-30
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• 2011

We study to design educational Logo-based microworld environment equipped with 3D construction capability, 3D manipulation, and web-based communication. Extending the turtle metaphor of 2D Logo, we design simple and intuitive symbolic representation system that can create several turtle objects and operations. We also present various mathematization activities applying the turtle objects and suggest the way to make good use of them in mathematics education. In our microworld environment, the symbolic representations constructing the turtle objects can be used for web-based collaborative learning, communication, and assessments.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제15권1호
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• pp.1-14
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• 2011

Logo has influenced many researchers and learners for the past decades as a 20 turtle geometry environment in the perspective of constructionism. Logo uses the metaphor of 'playing turtle' that is intrinsic, local and procedural. We, then, design an environment in which the metaphor of 'playing turtle' is applied to construct 3D objects, and we figure out ways to represent 3D objects in terms action symbols and 3D building blocks. For this purpose, design three kinds of representation systems, and asked students make various 3D artifacts using various representation systems. We briefly introduce the results of our investigation into students' cognitive burden when they use those representation systems, and discuss the future application measures and the design principles of Logo-based 3D microworld.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제11권1호
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• pp.65-74
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• 2007

The algorithmic idea has been a kind of necessary mathematics quality for modern people in this information society. In China the algorithm was represented fully as one of the new mathematics contents in the secondary level for the first time when The Standards of Mathematics Curriculum for the Senior High School was promulgated in 2003, so the research about the teaching algorithm undoubtedly has its practical implications for mathematics education. In this paper, with the conceptual framework of The Mathematics Task Framework as the research tool, an algorithmic teaching case based on LOGO software was introduced in detail, and data by ways of observations, interviews and worksheets were collected, then the case was analyzed. The results showed that the teaching of algorithm is feasible and effective in the LOGO environment. Some beneficial implications about the instructional design of algorithm were also discussed.

• 한국수학교육학회지시리즈A:수학교육
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• 제45권2호
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• pp.165-176
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• 2006

In this paper, we consider changes of algebra strands around the world. And we suggest needs of designing new computer environment where we make and manipulate geometric recursive patterns. For this purpose, we first consider relations among symbols, meanings and patterns. And we also consider Logo environment and characterize algebraic features. Then we introduce L-system which is considered as action letters and subgroup of turtle group. There are needs to be improved since there exists some ambiguity between sign and action. Based on needs of improving the previous L-system, we suggest new commands in JavaMAL microworld. So we design a microworld for recursive patterns and consider meanings of letters in new environments. Finally, we consider the method to integrate L-system and other existing microworlds, such as Logo and DGS. Specially, combining Logo and DGS, we consider the movement of such tiles and folding nets by L-system commands. And we discuss possible benefits in this environment.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제16권1호
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• pp.1-13
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• 2012

This paper explores gifted students' reasoning abilities. Three tests were developed in order to assess and analyze their reasoning abilities building on previous research on covariational reasoning. Giving consideration to the arising problems in the tests, we constructed a LOGO-based JavaMAL microworld environment which engages students in an active learning environment. This environment was designed by applying 'instrumental approach' in microworld. Based upon the post test results, the role of activity in microworld environment as 'instrument mediated activity' is also discussed.

• 한국항행학회논문지
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• 제10권4호
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• pp.406-412
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• 2006

본 논문에서는 워터마크 데이터로써 오디오 신호를 이용한 워터마크 기법과 이미지를 삽입하는 워터마크 기법의 성능을 분석하였다. AWGN 채널 환경에서 OFDM/QPSK 시스템을 이용하여 워터마킹된 영상을 전송하고 워터마크 정보를 추출하였다. 실험결과, 오디오를 이용한 워터마크 삽입 방법이 이미지 기반 방법보다 우수한 바, SNR=3 [dB]까지 오디오 신호가 복원 가능하였다.

• Nuclear Engineering and Technology
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• 제53권7호
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• pp.2195-2206
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• 2021

In order to mitigate the damage caused by accidents in nuclear power plants (NPPs), evacuation strategies are usually managed on the basis of off-site effects such as the diffusion of radioactive materials and evacuee traffic simulations. However, the interactive behavior between evacuees and the accident environment has a significant effect on the consequential gap. Agent-based modeling (ABM) is a method that can control and observe such interactions by establishing agents (i.e., the evacuees) and patches (i.e., the accident environments). In this paper, a radiological emergency evacuation model is constructed to realistically check the effectiveness of an evacuation strategy using NetLogo, an ABM toolbox. Geographic layers such as radiation sources, roads, buildings, and shelters were downloaded from an official geographic information system (GIS) of Korea, and were modified into respective patches. The dispersion model adopted from the puff equation was also modified to fit the patches on the geographic layer. The evacuees were defined as vehicle agents and a traffic model was implemented by combining the shortest path search (determined by an A ^* algorithm) and a traffic flow model incorporated in the Nagel-Schreckenberg cellular automata model. To evaluate the radiological harm to the evacuees due to the spread of radioactive materials, a simple exposure model was established to calculate the overlap fraction between the agents and the dispersion patches. This paper aims to demonstrate that the potential of ABM can handle disaster evacuation strategies more realistically than previous approaches.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2005년도 추계학술발표대회 논문집
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• pp.233-234
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• 2005

The design in this study is making a plan for the exterior color design for the factory of the H. company. The concept of this design is an integrated color program considering the physical characteristics of the buildings and the functional features of the factories. And this program is based on the aesthetic characteristics forming the men-friendly, professional environment and the environment-friendly, factory image. The scope of this design was limited to the exterior color for 1 office building and 3 factory buildings, including 7 attached facilities. All the 6 colors were selected, and the blue, the company logo color, is the main color.

• 한국수학교육학회지시리즈A:수학교육
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• 제42권2호
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• pp.177-191
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• 2003

In this paper, we present the theory of computers and mathematics education based on the concept of microworlds for mathematics education. We lust look back some previous papers published in the journal of the Korea society of mathematical education series A and else where. Then we present the new view points regarding mircroworlds and mathematics curriculems, microworlds and mathematics teaching and teaming, microworld based problem centered teaming, and microworld based diagnostics and debuggings. We use JavaMAL microworld that is designed to make LOGO and dynamic geometry system in one microworld to give some examples to explain the necessary mathematics educational needs fur designing microworlds for mathematics education. The JavaMAL microworld is a web based microworld that is programmed using JAVA, and the user on use script language, menus, keyboard, and mouse interaction to use the environment.

• 한국의상디자인학회지
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• 제14권1호
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• pp.161-174
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• 2012

This project purpose to develop a "custom patient gown" can satisfy with functional and aesthetic aspects for improving the problems of the existing children's patient gown that no unified image and discomfort in cooperation with the Public Design Development office as part of the citizen-friendly design improvement projects which one of the public politicizes of Seoul. The following are the results of design process for children's patient gown applying the universal design. First, the children's patient gown of the shape were classified into patient gown, rehabilitative gown and special gown and based on human-centered design to pursue the custom patient gown. Second, the color used pastel shades part of the Seoul colors and focused on emotions with color therapy theory. It was emphasized the aesthetic aspect by arranged the colors which harmonized with the main colors, also classified the wards and sizes. Third, for the functional materials of patient gowns was used the washable fabric and tender processing. Fourth, the accessories were matched the unified image and colors are suitable for the hospital environment such as bibs, aprons, and bedding. Fifth, Haechi, the symbol of Seoul was used as the logo. The Haechi logo and emotional message were applied to patient gowns to enhance the communication efficiency between patients and their guardians. As described above, the custom patient gowns for children's hospital will have significant ripple effects when they are expanded to national, public and private children's hospital. Such a qualitative change will pursue the respect and value of human by expanding the areas of public design for adults, the weak and the old-age society in future.