• Journal of Elementary Mathematics Education in Korea
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• v.19 no.3
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• pp.387-408
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• 2015

The purpose of this research is to analyze the mathematical tasks of length measurement in two different perspectives, the level of cognitive demands and learning trajectories, and restructure the mathematical tasks so that the students' conceptual learning is promoted and students are able to have opportunities to think more broadly. Ten lessons with the restructured mathematical tasks were implemented for a class of 2nd grade elementary students. Also a qualitative and in-depth study was conducted with 4 students of the target group. The study shows that firstly, the restructured tasks requiring high level of cognitive skills, had positive effects in increasing the students' level of thinking and reasoning. Secondly, the tasks modified according to the learning trajectories of Szilag, Clements & Sarama(2013) in length measurement, have proven to promote students' concept learning and elaborate the students' level of thinking.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.11
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• pp.809-817
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• 2022

The development of unmanned robots and UAVs has increased the need for path planning methods such as RRT^* algorithm. It mostly works well in various environments and is utilized in many fields. A lot of research has been conducted to obtain a better path in terms of efficiency through various modifications to the RRT^* algorithm, and the performance of the algorithm is continuously improved thanks to these efforts. In this study, a method using the limitation of sampling range is proposed as an extension of these efforts. Based on the idea that a path passing close to obstacles is similar to the optimal path in obstacle environments, nodes are produced around the obstacle. Also, rewiring algorithm is modified to quickly obtain the path. The performance of the proposed algorithm is validated by comparative analysis of the previous basic algorithm and the generated path is tracked by a UAV's kinematic model for further verification.

• Proceedings of the Costume Culture Conference
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• 2004.04a
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• pp.28-30
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• 2004

정보 기술의 발전으로 인해 서로 다른 곳에 있는 사람들이 인터넷을 통하여 하나의 가상 공간을 공유할 수 있게 되었고, 인터넷의 발달은 사람들이 가상공간에서 머무는 시간을 길어지게 하였다. 사람들은 오프라인의 편지보다는 온라인의 메일을 더 선호하게 되었으며, 얼굴을 마주하고 앉아 대화를 나누는 것보다 스크린을 마주하고 온라인에서 채팅을 하는 것이 자연스러운 생활의 일부가 되었다. (중략)

• The Optical Journal
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• s.136
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• pp.48-52
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• 2011

관측천문학의 역사는 망원경 발달의 역사이기도 한데 향후 망원경 개발에 있어서 분할경 제어 기술은 필수 기술이다. 본고에서는 미국에서 진행해 온 제어기술과 신기술망원경에서 개발을 진행하고 있는 독자적인 제어방식에 대해서 소개한다. 이 원고는 교토대학대학원 이학연구과의 이와무로 후미히데씨가 월간 'O plus E' 2009년 4월호에 기고한 내용으로서 그린광학의 유정훈 팀장이 번역에 도움을 주었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.8
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• pp.1561-1568
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• 2016

The youth with developmental disorders have substantial limitations in intellectual capacities and adaptive behaviors. For them to live independently as members of the local society after they graduate from high school, a continuous education in consideration of individual and environmental differences should be accompanied. The computer education can be a useful tool in their integration into the local society by 'Expansion of universality and the equality of education'. Particularly, the computer education as a transitional educational process can be of practical help for them to sustain independent and daily lives in the adult world. In this regard, this writing reviews 1) the integration into the local society of the youth with developmental disorders and the transitional education, 2) the significance and meaning of computer education for the youth with developmental disorders, and 3) the status of computer education for the youth with developmental disorders to present improvements for the computer education of the youth with development disorders.

• Journal of Life Science
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• v.13 no.6
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• pp.822-828
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• 2003

This study was carried out to investigate the changes of enzymes and micro inorganic nutrients that is associated with flower senescence during flower development in tulip cultivars, ‘Apeldoorn’ and ‘Golden Apeldoorn’. Ribonuclease, peroxidase and protease activities were gradually increased from the stage of early flowering to later Polyphenol oxidase showed the highest activity at stage 5, which the flower was in full bloom indicating that it acts at an initial stage of flower senescence. The protease activity was different in the petal extracts during flower development between the cultivars ‘Apeldoorn’ (red petal) and ‘Golden Apeldoorn’ (yellow petal). This result suggested that protease might relate to pigment biosynthesis in petal of tulip. In contrast to the decrease of inorganic nutrients K, Mn, Zn and P contents during floral development, Ca, Mg and Fe showed the gradual increasement that is similar with ribonuclease, peroxidase and protease. It suggests that they have some interaction during flower senescence.

• Journal of The Korean Association For Science Education
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• v.8 no.1
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• pp.81-94
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• 1988

본 연구의 목적은 Piaget의 인지발달단계(전조작 구체적 조작 단계)에 따른 자연과 개념획득에 효과적인 교수전략을 탐색하기 위한 연구로서, 첫째는 문헌연구를 통해서, Piaget의 인지이론을 기초로한 교육론과 개념학습을 위한 교수전략을 연구함으로써 전조작 단계의 어린이, 구체적 조작단계의 어린이에게는 연역적 교수전략보다 귀납적 교수전략이 더 효과적이며, 구체적 조작단계의 어린이에게는 초보적인 논리능력이 발달하므로 연역적 교수전략도 가능하며, 이 2가지의 인지단계가 복합돼 있는 국민학교 2학년 집단에게는 귀납적 교수전략이 보다 효과적일 것이라는 데에 이르렀다. 둘째로는 현장 실험연구로서 실제로 자연과 2학년의 한 단원을 연억 귀납의 교수전략의 단계에 맞추어 적용하였다. Piaget의 인지 발달 단계예 따른 자연과 개념획득을 위한 효과적인 교수전략을 탐색해본 결과는 다음과 같다. 첫째, 전조작 단계의 아동은 자연과 개념획득을 위해서는 연역적 교수전략보다 귀납적 교수전략이 더 효과적이다. 둘째, 구체적 조작단계의 아동에게는자연과 개념획득을 위한 교수전략은 귀납적 교수전략이 효과적이지만, 연역적 교수전략도 가능하다는 것이다. 이로써 국민학교 2학년 즉, 전조작 단계와 구체척 조작단계가 복합돼있는 집단에게는 연역적 교수전략보다 귀납적 교수전략이 보다 더 효과적이라는 것이다.

• Journal of Digital Contents Society
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• v.19 no.9
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• pp.1679-1688
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• 2018

The development of digital technology has not only led to the development of expressive technology, but also to change in the process of production, expression media, production formats and methods, and communication with the audience. In one form, motion poster using LCD display instead of paper poster was introduced. This not only suggests the generation of posters with sound and movement on the ground, but also the possibility of expansion using the features of a platform called LCD displays. As part of this extension, this paper focuses on the "interactions" element and suggests a new interactive motion poster.

• Nuclear Engineering and Technology
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• v.27 no.6
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• pp.888-893
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• 1995

The turbulence structure for fully developed flow through the subchannels formed by the bare rod array depends on the pitch to rod diameter ratio. For fairly open spaced bare rod arrays, the distributions of the three components of the turbulent normal stresses are similar to those measured in circular pipe. However, for more closely spaced arrays, the turbulence structure, especially in the gap region, depart markedly from the pipe flow distribution. A linear relationship between turbulent normal stresses and turbulent kinetic energy for fully developed turbulent flow through regularly spaced bare rod arrays has been developed. This correlation can be used in connection with various theoretical analyses applied in turbulence research.

• Korean Journal of Childcare and Education
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• v.7 no.4
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• pp.1-26
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• 2011

The purpose of this study was to examine the screening and its validation of children with language developmental delay in child care and education centers, the response of parents with children with language developmental delay and the assistance needs of child care and education teachers for those children. Teacher interview with semi-structural method, transcription and content analysis method were used. The subjects in this study were 13 teachers and 30 infants and toddlers with language developmental delay in 10 child care and education centers in Seoul. The findings of the study were as follows: First, the child care and education teachers screened children with language developmental delay in their classes based on their verbal characteristics and maladjusted behavior. Their screenings were turned out correct. Second, as for the response of parents, the parents who had children with language developmental delay were indifferent, were aware of the fact in advance or asked the teachers for counseling on their children's language developmental delay. Third, the teachers couldn't provide the appropriate supports for the children in needs. Fourth, regarding the assistance needs of the child care and education teachers, they called for assistance from specialists and professional institutions, and wanted to receive education on language development. Besides, they asked for relevant supporting materials and screening criteria, and considered it necessary to reduce the ratio of teacher to children.