• The Bulletin of The Korean Astronomical Society
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• v.42 no.1
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• pp.36.4-37
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• 2017

Although most of observed properties of giant radio relics detected in the outskirts of galaxy clusters could be explained by relativistic electrons accelerated at merger-driven shocks, a few significant puzzles remain. In some relics the shock Mach number inferred from X-ray observations is smaller than that estimated from radio spectral index. Such a discrepancy could be understood, if either the shock Mach number is nder-estimated in X-ray observation due to projection effects, or if pre-existing electrons with a flat spectrum are re-accelerated by a weak shock, retaining the flat spectral form. In this study, we explore these two scenarios by comparing the results of shock acceleration simulations with observed features of the so-called Toothbrush relic in the merging cluster 1RXS J060303.3. We find that both models could reproduce reasonably well the observed radio flux and spectral index profiles and the integrated radio spectrum. Either way, the broad transverse relic profile requires additional post shock electron acceleration by downstream turbulence.

• Journal of Korea Multimedia Society
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• v.21 no.1
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• pp.69-76
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• 2018

Augmented Reality (AR) technology has rapidly been applied to various application areas including e-learning and e-education. Focusing on the design and development of android tablet application, this study targeted to develop infant music education using AR technology. We used a tablet instead of personal computer because it is more easily accessible and more convenient. Our system allows infant users to play with teaching aids like blocks or puzzles to mimic musical play like game. The user sets the puzzle piece on the playground in front of the tablet and presses the play button. Then, the system extracts a region of interest among the images acquired by internal camera and separates the foreground image from the background image. The block recognition software analyzes, recognizes and shows the result using AR technology. In order to have reasonably working recognition ratio, we did experiments with more than 5,000 frames of actual playing scenarios. We found that the recognition rate can be secured up to 95%, when the threshold values are selected well using various condition parameters.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.163-166
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• 2012

본 논문에서는 퍼즐을 활용하여 초등정보영재교육 방안을 제안하고자 한다. 현재의 정보영재 교육과정을 살펴보면 프로그래밍학습과 알고리즘 학습에 치중하고 있다. 이것은 직접 체험하고 조작하며 학습하는 초등학생의 특성상 효과적인 방법이 아니다. 따라서 흥미와 재미의 요소를 포함하고 정보교과의 부담을 줄여주며 논리적인 사고력을 향상시켜줄 수 있는 퍼즐을 활용한 초등정보영재교육을 제안한다. 또한 최근 컴퓨터 과학에서 강조하고 있는 계산적 사고(Computational Thinking)와 퍼즐활용교육과의 관계를 살펴보고 퍼즐활용 교육을 통해 계산적 사고를 기를 수 있음을 제시한다. 추후에 초, 중, 고 정보영재교육을 연계를 위한 퍼즐 교육에 많은 연구가 필요하다.

• Journal of Gifted/Talented Education
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• v.7 no.1
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• pp.77-116
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• 1997

The paper-and-pencil multiplce choise test has been widely used to identify gifted and talented student in Korea. Such test have several drawbacks; such~a s not being able to assess creative problem solving abilities and high level thinking abilities which are important characteristics of gifted students. The Korean Educational Development Institute (KEDI) developed a performance assessment which challenged traditional methods of identification. The 5-day summer camp was held to select gifted students for the Korean Minjok Leadership Academy. 211 students were evaluated in the aspects of creative problem solving abilities, high level thinking abilities, task commitments, and cooperativeness with various performance tasks, such as essay tests, conversations, oral examinations, computer simulations, puzzles, experiments, group discussions, debates, research reports, and games. As a result, it was found that there were several limitations of the performance assessment in terms of low reliability, requiring high costs and many professionals, and taking long times and large spaces. Expanding and continuing research should follow in order for a performance assessment to use widely as an identification methods because it assesses 'true' abilities of each individual student. follow in order for a performance assessment to use widely as an identification methods because it assesses 'true' abilities of each individual student.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.382-385
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• 2008

본 논문은 게임 풀이를 통해서 모델 체킹 도구의 특징을 분석한다. 도망자-추적자 게임은 격자 모양의 미로에서 도망자가 추적자를 따돌리고 탈출하는 게임이다. 도망자가 격자 상에서 한 칸 움직일 때, 추적자는 일정한 패턴을 가지고 두 칸 움직인다. 이 문제를 SMV와 SPIN 모델 체커로 모델링하고 검증하는 과정을 통해서 SMV와 Spin 모델 체커의 특징을 분석한다. 실험을 통해서 우리는 최단 경로를 찾을 경우는 SMV 모델 체커를 사용해야 하고, 가능한 경로를 빨리 찾는 경우는 Spin 모델 체커가 더 적합함을 확인할 수 있었다.

• Journal of the Korean Society of Radiology
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• v.17 no.7
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• pp.1109-1114
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• 2023

This study investigated the effects of utilizing 3D printed teaching aids on academic achievement and learning motivation in a non-face-to-face learning environment during the COVID-19 pandemic. The study was divided into an experimental and a comparison group that applied traditional lecture-based teaching and self-directed learning using 3D printed teaching aids and videos. The results of the study showed that the experimental group using 3D printed brain puzzles improved their academic performance compared to the comparison group using traditional lectures. This may be due to the fact that visual and experiential learning helped students to acquire knowledge on their own. The brain puzzles provided an interesting learning experience for the students, and their overall satisfaction with the class was also positive. These results indicate that teaching with teaching aids can increase students' motivation to learn and improve their academic performance. Therefore, the active introduction of 3D printed teaching aids in the non-face-to-face learning environment caused by COVID-19 is expected to improve the quality of education through innovation in learner-centered teaching methods.

• English Language & Literature Teaching
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• no.6
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• pp.143-157
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• 2000

It has been one of the puzzles in the English syntax that so called the rule of subject-auxiliary inversion (SAI) is not allowed in subject wh-movement while it is not obligatory in non-subject wh-movement in a root sentence. This asymmetry has been a puzzle since SAI itself was thought to be a part of question construction as we can observe from yes/no questions. The asymmetry gets more complicated in terms of sentence embedding, i.e no SAI is permitted in the embedded context in question. The goal of this paper is to suggest an unified analysis for this unsolved grammatical phenomena on the basis of Rizzi (1997)'s recent work. The main idea is that SAI is not a I-to-C movement but one of I-to-Focus where Focus is a functional category and its phrase is located between CP and IP. The other proposal is that Wh-movement is no more homogeneous in terms of landing site between a root and an embedded sentence: the target for a wh-phrase in the former is the Spec of FocP (Focus Phrase) but the one in the latter is the Spec of CP as the standard theory assumes. Pesetsky (l999)'s analysis is discussed and its theoretical and empirical shortages are pointed out. Its rather radical proposals such as the one that the nominative case is just an uninterpretable tense feature of DP and the other that 'that' is no longer a complementizer but an element of I(nflection) make it less acceptable in spite of the possibility that it can get rid of Case theory entirely, which would be ideal in the spirit of minimalism.

• Journal of the Korean School Mathematics Society
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• v.9 no.3
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• pp.363-384
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• 2006

In general, teachers have opened a specially supplementary course for the underachivers in mathematics. But because of a lot of problems, the class has not been activated. So in this paper, for the purpose of maximizing the effect of the class, we introduce mathematical games and puzzles in the class for causing the students' interest in mathematics and adopt multi-step test, which is a test with multi level problems in a problem, for both selecting the underachivers in mathematics and supplementing learning deficiency. As a result of the process, the atmosphere of learning is positive and learning activities are voluntary and the altitude to the mathematics is improved.

• Proceedings of the KIEE Conference
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• 2008.04b
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• pp.25-27
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• 2008

This paper discusses the implications of the MASTER SPEC project and its introduction to Korea in terms of social and political contexts. The motives for this report starts from both theoretical and empirical puzzles. Its theoretical motive is concerned to the right form of governance of electric-construction standardardization. Upon the experience of the United States and many European countries, we have acknowledged the role of government in the setting of industrial policy formats and standardization. However, the mechanisms of industrial governance have greatly changed these days, from the centralized one to the participatory one. We call the latter type governance. The form of governance implies the participation of both public and private actors in the policy-making of industrial matters. We have sought to find a better format in the case of electric-construction field. The answer is: the governance initiated by the private actors rather than the government-centered one. The project of MASTER SPEC, in this sense, has many probable implications toward the standard-setting of future industrial managements in Korea.

• Journal of The Korean Association of Information Education
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• v.20 no.1
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• pp.93-100
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• 2016

Computer Science Unplugged is a collection of free learning activities that teach Computer Science through engaging games and puzzles that use cards, string, crayons and lots of running around. In spite of the success of unplugged activities, the unplugged resources for experiencing the concepts of data structures is lacked. In this study, we design, implement and survey the 3 hour lessons of the core concepts of graph theory and the shortest path algorithm for the primary students using computer science unplugged activities. Our survey results showed that our lesson plan is adequate for primary school students and will have a positive effects for primary school students.