• Journal of Species Research
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• v.12 no.3
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• pp.258-265
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• 2023

We conducted phylogenetic analyses using multiplexed inter-simple sequence repeat genotyping by sequencing and compared chloroplast DNA sequences among Ardisia japonica, A. pusilla, and morphologically intermediate plants found on Jeju Island, Korea. Our network analysis demonstrated that the intermediate plants were genetically positioned between A. japonica and A. pusilla. Our comparison of the intergenic spacer between the psbA and trnH genes in chloroplast DNA indicated that four nucleotide substitutions separate A. japonica and A. pusilla, whereas the intermediate plants exhibited the A. japonica haplotype. Our results suggest that the intermediate plants on Jeju Island represent a natural hybrid of A. japonica, as the maternal species, and A. pusilla, and that they are attributable to Ardisia×walkeri. This record constitutes the first documented occurrence of the hybrid taxon in Korea.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.23.3-23.3
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• 2008

In this study, the nature of nonlinear field line resonances (FLR) is studied by adopting full MHD simulations. The MHD code used here is based on the total variation diminishing (TVD) scheme and we have performed numerical simulations of FLR with its three-dimensional code. If the source perturbation is strongly impulsive and thus the timescale of the initial variations is sufficiently smaller than the convection timescale, FLRs are easily confirmed in these simulations. When the disturbance is sufficiently small, it is shown that linear properties of MHD wave coupling are well reproduced. In order to examine nonlinear nature of FLR, wave spectra, Poynting flux and energy distribution are studied at resonances as the magnitude of initial disturbance gradually increases.

• Journal of Science Education
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• v.37 no.2
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• pp.389-404
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• 2013

This study aimed to explore elementary teachers' beliefs about science teaching, science learning and the nature of science and consistency among these beliefs. Data was collected by using an open questionnaire and semi-structured individual interview. Teachers' beliefs were classified as traditional beliefs and constructivist beliefs. Traditional beliefs were further divided into content knowledge-centered beliefs and procedural knowledge-centered beliefs. The result showed that a relatively large number of teachers among the total 30 teachers had traditional beliefs about science teaching, science learning, and the nature of science(respectively 60.0%, 66.7%, 83.3%). Most of traditional beliefs were identified as content knowledge-centered beliefs. The proportion of teachers with consistent beliefs for all three aspects was 40.0%, the proportion of those with consistent beliefs for two of them (those with related beliefs) was 53.3%, the proportion of those with different beliefs for them (those with divergent belief) was 6.7%. Most of the teachers with the consistent beliefs had the content knowledge-centered beliefs of traditional beliefs. Although constructivism has been widely emphasized in science education from the 1980's, the rate of the teachers with the consistent beliefs in constructivism was as low as 6.7%.

• The Journal of Korean Association of Computer Education
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• v.11 no.3
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• pp.1-11
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• 2008

All learners have to improve problem-solving abilities based on the principles of Computer Science and Computational Concepts as well as enhance their information technology fluency for living in the 21st century. However, there are no clear answers for fundamental questions such as 'What is Computer Science?' or 'What is the nature of Informatics education?'. Informatics education is threatened by the terminological confusion and misleading external images of Computer Science or Informatics education. Therefore, in this study, we closely reviewed perspectives on the nature and necessity of Informatics education and suggested a perspective to improve Informatics education. First, we examined how the definition of Computer Science has changed and pointed out that the Computer Science curriculum has operated differently from country to country because of the different viewpoints about Computer Science. Moreover, we presented evidence to assert that Informatics education should be considered as an independent science subject that is for all students. Finally, we suggested essential elements to insist that Informatics is a discipline to improve computational thinking. Essential elements consisted of 'Representations', 'Processes', 'Machines', 'Relationships' and 'Construction'. We suggested that the concept of Informatics should be extended based on these five elements.

• Korean Journal of Agricultural Science
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• v.51 no.1
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• pp.9-23
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• 2024

This study investigates the physiological and psychological effects of a nature-based outdoor activity program in an environment reflecting the characteristics of forest and coastal areas on 30 firefighters (average age: 40.4 ± 9.8 years) who are frequently exposed to dangerous situations. Blood pressure, pulse pressure, and heart rate variability were used as physiological measurement indicators, and the Korean versions of PANAS (positive affect and negative affect schedule), WEMWBS (Warwick-Edinburgh mental well-being scale), and PRS (perceived restorativeness scale) were used as psychological measurement indicators. For four days and three nights, the participants experienced programs at Hallyeohaesang Nature Center and the surrounding mountains, seas, and islands, utilizing forest resources such as trekking on forest trails, walking barefoot, taking aromatic footbaths, meditating in forest oxygen domes, and lying on relaxation chairs, and programs utilizing marine resources such as taking a boat to an island, walking on forest trails with seascape views, and sailing on a yacht. Participants' systolic blood pressure and pulse pressure decreased, and participants' positive emotions increased and negative emotions decreased after the program. There was a statistically significant increase in mental well-being and perceived restorative environment. Through this study, it was found that nature-based outdoor activity programs based on forest and marine resources are effective in physiological and psychological stability of firefighters. It is hoped that the results of this study will be applied to other high-risk workers for PTSD, who have high stress levels, by combining forest healing and marine healing, and expanding the scope and diversity of programs in more diverse environments and conditions.

• Journal of Science and Technology Studies
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• v.16 no.2
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• pp.33-63
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• 2016

This paper compares and contrasts the concept of nature and the theory of evolution held by leading synthetic biologists and transhumanists in the post-genomic era. Synthetic biology, which emerged in the early 2000s, aims to design biological systems that perform specific functions with the two key concepts of "rational design" and "directed evolution". However, synthetic biology has also raised serious concerns about the creation of man-made biological materials and the manipulation of the direction and speed of evolution. It is no wonder that transhumanists, who dream of creating new, enhanced human species, have welcomed the arrival of synthetic biology. How, then, can we deal with the nature reinvented by synthetic biology? By what means can one justify research that may affect the process of evolution? What intellectual resources do synthetic biology and transhumanism share in common? What influence would the new trend of commercialization of science and technology exert upon the development of synthetic biology? Addressing those questions, this paper argues that the moral authority of nature can be restored in this post-genomic era.

• Journal of Environmental Science International
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• v.18 no.4
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• pp.411-422
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• 2009

This study was investigated on biodiversity and life forms of plants distributed in 28 wetlands on Jeju city, in order to apply wetlands to nature exploration sites for environmental education. The 131 kinds of the plants were found on 28 wetlands. The plant biodiversity was relatively high in Ban pond, Jeongmool, Mosanimool, Dolgaegi pond, Woot pond, and etc. The $5{\sim}6$ life forms of plants, relatively high in variousness to other wet lands, were distributed in Mosanimool, Dolgaegi pond, Woot pond, and Yeonhoa pond as well as Jeongmool and Yongsoo reservoir. The 71 kinds, which correspond to 54.2% of plants observed in this study, were identified as hydrophytes. The $4{\sim}5$ forms of hydrophytes were distributed on 23 wetlands, including Jeongmool, Mosanimool, Yongsoo reservoir, Ban pond, Dolgaegi pond, and etc. In conclusion, 5 wetlands such as Jeongmool, Yongsoo reservoir, Dolgaegi pond, Mosanimool and Woot pond were high in variousness of plant life forms as well as biodiversity of plants. These results suggest that 5 wetlands above could be applied as nature exploration sites. In addition, Korean rare and endangered plants such as Isoetes japonica, Nymphoides coreana, Utricularia japonica and Sparganium stoloniferum in this study need to be conserved.

• Journal of the Korean earth science society
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• v.41 no.2
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• pp.147-154
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• 2020

The purpose of this study was to analyze epistemological beliefs in science as perceived by elementary school students and to examine the purpose of science, the nature of scientific knowledge, the source of scientific knowledge, and the role of experimentation. The subjects of this study were 99 elementary school students. As a tool for examining epistemological beliefs in science, we used adapted questionnaires comprising elements constituting epistemological beliefs, as proposed by Elder (1999). The results of the analysis are as follows: First, in terms of the purpose of science, sixth graders had the most modern beliefs compared to other grades. Second, a statistical significance was found between fourth graders and students in other grades based on the analysis of the nature of scientific knowledge. Third, there was no significant difference in each grade's beliefs concerning the source of scientific knowledge or the role of the experiment.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.150.1-150.1
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• 2012

학자의 연구능력과 성과를 질적인 면을 포함하여 제대로 가늠하지 못하는 사회에서는 대신 몇몇 평가지표가 등장하는데, 한국에서는 영향력지수(Impact Factor)와 함께 많이 사용되는 것이 Nature와 Science 저널에 실린 논문이다. 두 저널은 과학의 전 분야를 대상으로 하며, 영향력지수가 25-35점으로 다른 저널(예: Astrophysical Journal ~6점)보다 월등히 높아 세간에서 '매우 좋은' 저널로 불리며, 여기에 실리는 논문이 '뛰어난' 논문으로 평가되고 있다. 우리는 2006-2010년의 5년간 두 저널에 실린 논문의 통계를 분석하였다. 전체 논문의 수는 7788편이며 생명과학 논문이 62.4%, 물리과학 논문이 37.0%를 차지한다. 천문학 논문의 수는 544편인데, 이는 전체 논문 중에는 7.0%를 차지하고 물리과학 논문 중에는 18.9%를 차지한다. 평균적으로 매년 Nature에는 약 64편, Science에는 약 45편의 천문학 논문이 실렸다. 천문학 논문들의 경우 세부 분야별 논문의 비율과 사용한 장비의 분포를 조사하였다. 전체 논문 중 국내의 한국인 저자가 포함된 논문은 86편인데 이는 전체 논문 중 1.10%에 해당한다. 이들의 물리(25.6%), 화학(16.3%), 생명과학(29.1%), 지구과학(12.8%), 공학(16.3%) 분야별 비율을 구했다. 천문학 분야의 국내 한국인 저자 논문은 7편에 해당한다. 본 발표에서는 우리가 구한 여러 가지 통계치와 시사점을 제시하고자 한다.

• Korea-Australia Rheology Journal
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• v.15 no.1
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• pp.19-25
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• 2003

Since the microstructure of functional thin films depends on the dispersion characteristics of dense slurry, it is important to control the agglomerative nature of slurries under processing. The present authors have been discussing the model prediction of agglomerative nature and local rate of agglomeration in dense suspensions. The experiments have been peformed under shear flow using the nearly spherical and oblate type graphite particles. In this study, the experiment has been conducted using water and glycerol as dispersion media. Stress control type rheometer was used to measure the slurry rheology. Local agglomeration of graphite particles has been predicted by using Usui's model. The experimental results show that both the shape and slurry processing method affect on the local dispersion condition. The agglomeration formed by oblate type graphite particles seems to be more difficult to break up than that of spherical particles.