• 호남수학학술지
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• 제34권4호
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• pp.597-601
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• 2012

In this paper we study the density of imaginary cubic function fields having the infinite Hilbert 3-class field tower.

• 대한수학회보
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• 제50권3호
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• pp.1049-1060
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• 2013

In this paper we study the infiniteness of Hilbert 2-class field towers of imaginary quadratic function fields over $\mathbb{F}_q(T)$, where $q$ is a power of an odd prime number.

• Korean Journal of Mathematics
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• 제20권4호
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• pp.477-483
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• 2012

In this paper we study the infiniteness of the Hilbert ${\ell}$-class field tower of imaginary ${\ell}$-cyclic function fields when ${\ell}{\geq}5$.

• 충청수학회지
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• 제25권2호
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• pp.283-289
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• 2012

In this paper, we define the Ono invariants of imaginary quadratic function fields and obtained several results concerning the relations between the Ono invariants and the class numbers.

• 충청수학회지
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• 제26권1호
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• pp.161-166
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• 2013

In this paper we study the infiniteness of the Hilbert 3-class field tower of imaginary cubic function fields.

• 대한수학회보
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• 제45권2호
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• pp.375-384
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• 2008

Let $k={\mathbb{F}}_q(T)$ and ${\mathbb{A}}={\mathbb{F}}_q[T]$. Fix a prime divisor ${\ell}$ q-1. In this paper, we consider a ${\ell}$-cyclic real function field $k(\sqrt[{\ell}]P)$ as a subfield of the imaginary bicyclic function field K = $k(\sqrt[{\ell}]P,\;(\sqrt[{\ell}]{-Q})$, which is a composite field of $k(\sqrt[{\ell}]P)$ wit a ${\ell}$-cyclic totally imaginary function field $k(\sqrt[{\ell}]{-Q})$ of class number one. und give various conditions for the class number of $k(\sqrt[{\ell}]{P})$ to be one by using invariants of the relatively cyclic unramified extensions $K/F_i$ over ${\ell}$-cyclic totally imaginary function field $F_i=k(\sqrt[{\ell}]{-P^iQ})$ for $1{\leq}i{\leq}{\ell}-1$.

• 미국학
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• 제44권1호
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• pp.39-79
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• 2021

This paper examines professional and popular medical discourse on "mongolism" (Down syndrome) in the early twentieth century to delve into the history of mongolism and the "Oriental imaginary" of modern America. The Oriental imaginary is a concept to explore the ways in which Americans, who had heard of mongolism or seen a "Mongol" themselves, imagined and conceptualized the defect in terms of the contemporary race relations. Moving beyond the interests of medical professionals discussed in the previous scholarship, this paper aims to include views and perceptions of the American public. The second section reviews the existing studies of the history of mongolism in the West. The third section discusses the mongolism of Asians and African Americans, among whom it had long been believed not to occur. Lastly, an analysis of American newspaper health advice columns on mongolism sheds light on the public reception and transmission of medical knowledge.

• 한국과학교육학회지
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• 제28권7호
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• pp.724-729
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• 2008

Well-integrated science instruction with art often motivates students to more engage in science learning and to freely express their thoughts and feelings on what they have learned in science classes. This study, therefore, attempted to explore Korean children's imaginary science drawings. Ninety elementary students ($3^{rd}-6^{th}$ graders) in Seoul, South Korea, participated in this study. The guiding research questions were 1) what overall characteristics of students' imaginary science drawings are and how these characteristics represent children's image of science, and 2) what educational value of children's imaginary science drawing activity as a case of science-art integration is. Data sources included a set of children's drawings and individual interviews with selected students. From the drawings, it was found that most of the subjects that children drew tended to be limited to the space. In addition, the children tended to assimilate science into technology that makes our life more convenient. We also found imaginary science drawing can be a good science-art integrated instruction method. Imaginary science drawing has educational benefits; one is a tool to investigate children's thoughts and knowledge of science while the other is method that motivate children to learn science effectively.

• 한국과학교육학회지
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• 제34권2호
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• pp.175-186
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• 2014

이 연구에서는 짝 활동이 초등학생의 과학상상화 특성 및 과학상상화에 대한 인식에 미치는 영향을 조사하였다. 이를 위해 초등학교 4학년 학생 123명을 선정하여 각각 개별적으로 과학상상화를 그리는 개별 집단(n=61)과 짝과 함께 과학상상화를 그리는 짝 집단(n=62)으로 배치한 후 설문 조사를 실시하였다. 연구 결과, 짝 과학상상화 그리기는 과학상상화에 대한 이해, 주제와 시제의 다양화, 과학적 아이디어 생성, 상상화의 정교화 등의 인지적 측면뿐만 아니라 과학에 대한 흥미와 친근감, 친구와의 친근감, 과학상상화 그리기에 대한 흥미 유발 등의 동기적 측면에서 도움이 되는 것으로 나타났다. 하지만 새로운 과학지식 습득, 과학지식 기억, 과학적 논리 구성력 향상, 과학적 상상력 향상 등의 인지적 측면이나 그림 표현 능력 향상, 그림 채색 능력 향상, 미술 작품 완성 능력 향상 등의 심미적 측면의 효과성에 대한 인식을 긍정적으로 변화시키는 데에는 제한점이 있었다. 또한 상상하기, 주제정하기, 표현하기의 어려움이 해소되지 못했을 뿐만 아니라 협동기술에 관한 몇 가지 단점도 지적되었다.

• 동의신경정신과학회지
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• 제19권3호
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• pp.35-44
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• 2008

Objective: There are many meditation methods used in clinical field. But the effect of meditation may be different to people's mind, and meditation itself. Now we investigate this subject with two different meditation methods which has been analyzed by heart rate variability. Method: We tried to check people's heart rate who educated meditation, before educated and during the meditation. The meditation was educated differently for each group. One is the auto genes traning, and the other is the imaginary meditation by thinking about eating and smelling favorite fruits. All of them are used to oriental psychiatry clinic patients. And we simultaneously conduct people's emotional state by SCL-90-R. Result: The result in Autogene traning group has significant difference in total power and HRV-index score between before and during the training but in imaginary meditation group has no significance: Autogene traning group has a significance in low frequency score and has increased tendency with increasing tendency of Heart rate index and Total power. Through the SCL-90-R score, the higher depression t-score, the anxiety t-score, and the hostility score is, the HRV scores such as total power, low frequency, and HRV-index much increase. and so on. Conclusion: We can guess that the Autogenes training has more significant effect than the imaginary meditation. And we can also guess that as the emotional problem is getting more severe, the effect of meditation would be much better. And we finally suggest that we should make a standard guideline of imaginary meditation, cause the imaginary meditation has so many variation.