개발에 의해 조성된 매립지의 기후특성 (Ⅰ)

민병형,김가현,이승휘,이정환,강대석 東亞大學校 海洋資源硏究所 2003 硏究論文集 Vol.15 No.-

The security of Busan waterfront space mostly depends on the reclamation of the coastal zone. The temperature variation is caused by the reclamation, and the model formula of correlation with the reclamation quantity in the coastal zone of Busan is derived(X=logl0α, α=the total of the reclamation quantity). For the determinating coefficient γ²=0.86609 Y= - 157.06659 + 91.766855X - 16.6357X² + 1.0534768X³- 0.006741X⁴ From this, the later temperature increase followed by increase of the reclamation quantity is predicted.

후복막강에 발생한 활막육종

채승완,심정원,안혜경,이민철,박영의 대한병리학회 1995 Journal of Pathology and Translational Medicine Vol.29 No.4

원적외선 광조사에 의한 도핑되지 않은 반절연성 GaAs의 광전류 전이와 열자극 전류

김화민,박승환,김종재,고석중,최병두 대구효성가톨릭대학교 자연과학연구소 1994 基礎科學硏究論集 Vol.1994 No.1

도핑되지 않은 반절연성 GaAs의 광전류 급냉과 열적 회복효과를 조사하기 위하여, 성장 방법이 다른 두개의 반절연성 GaAs시료에 대해 원적외선 영역(hv≤1.12eV)의 광조사에 의한 열자극 전류(TSC)스펙트럼들이 측정되었다. LEC방법에 의하여 성장된 As가 풍부한 반절연성 GaAs시료에 대한 50K에서의 광전류의 급냉 과정은 두 단계로 대별된다. 광전류 값이 최소가 되는 시간으로 전이시간 t_T를 정의할 때, (1) IR 광조사 시간 t<t_T이면, EL2(기저상태)→EL2^*(준안정상태) 전이에 의하여 광전류가 감소하고, (2)t>t_T이면, persistent photocurrent (PPC)효과에 의하여 광전류는 다시 증가하였다. 이러한 차이는 성장 방법과 조성비에 따른 잔류불순물의 농도가 광전류 변화에 영향을 준 때문으로 판단된다. 한편, 광조사 시간에 따른 TSC 피크들의 급냉과 급냉된 피크들의 열적 회복에 대한 온도 의존성은 EL2의 기저상태와 준안정 상태 간의 전이 또는 열적 회복과정과 거의 일치하였다. 따라서, 광전류의 급냉 전과 후에 각각 다른 형태로 관측되는 TSC스펙트럼 구조는 EL2 또는 EL2^*와 직접적인 관련을 갖는 트랩들의 분포에 의해 결정되고, 이 트랩들은 EL2-점결함 또는 EL2-잔류불순물로 형성된 complex에 의한 것으로 추론되었다. To study the photoquenching and thermal recovery effects in undoped semi- insulating (Sl) GaAs,the thermally stimulated current (TSCI) spectra, by illuminating infrared light (hv≤ 1.12 eV), are measured with two different Sl-GaAs samples, grown by the liquid-encapsulated Czochraski (LEC) and the horizontal bridgeman (HB) methods. In the As-riched Sl-GaAs sample by LEC method, the photo-current (I_ph) quenching process at 50 K consists of the following two stages: (1) quenching of I_ph due to the transition EL2→EL2^* before a transition time t_T and (2) enhancement of I_ph due to persistent photocurrent (PPC) after t_T, where t_T is defined as the time in which I_ph becomes minimum. However, neither re-enhancement of I_ph nor PPC are observed in the Sl-GaAs sample by HB method. This distinction results from the difference on the concentration of residual impurities, dependent on the growing method and composition rate, in the above two samples. The illumination time dependence of the quenching of TSC peaks and the temperature dependence of their thermal recovery are nearly fitted into those of the ground-to-metastable-state transition or thermal recovery process of EL2. Asa result, it is inferred that the TSC spectral structure, showing different feature before and after IR-quenching, is determined by the distribution of traps associated directly with EL2 or EL2^* and the traps are originated from a complex of EL2-point defect or EL2-residual impurities.

중학교 과학영재 담당교사의 PCK 요소의 특징과 관련성

김선경,민희정,방은정,백성혜 韓國英才學會 2011 영재교육연구 Vol.21 No.4

중학교 과학영재 담당교사의 수업을 관찰하여 Pedagogical Content Knowledge(PCK)의 요소 를 분석하고, 요소간의 관련성을 알아보았다. 연구 대상은 대도시 지역의 중학생 대상 영재교 육원에서 과학을 가르치는 교사 4명이었으며, 전공은 각각 물리, 화학, 생물, 지구과학이고 2 명은 전임교사, 2명은 겸임교사였다. 또한 전임교사들은 영재학생들만 가르쳤고, 겸임교사들 은 보통 일반학생들을 가르쳤고, 특별히 주 1회 영재학생들을 가르쳤다. 수업관찰, 반구조화 된 인터뷰를 실시하였으며, 문서자료를 수집하여 질적으로 분석하였다. 연구 결과, 과학영재 담당교사의 PCK 요소의 몇 가지 특징이 나타났다. 교사들의 과학교수지향은 PCK의 요소들 과 긴밀하게 상호작용하고 있었다. 교사들의 교육과정지식은 교사에 따라 상이했지만, 학습 유형의 선택은 교사의 영재 교육 및 수업의 목표와 관련되어 있었다. 또한 이러한 교육과정 지식은 학생에 대한 이해의 영향을 받았다. 교사들은 교육과정지식과 학생에 대한 이해에 따 라 수업에서 서로 다른 교수전략을 사용하고 있었다. 또한 PCK의 요소들의 관계는 밀접했으 며 방향성을 가지고 있었다. 이러한 연구결과를 바탕으로 PCK의 요소와 관계성을 설명하기 위해 사면체 모델을 제안했다. In this study, we analyzed the characteristics of Pedagogical Content knowledge(PCK)'s components through actual course of teachers of science gifted students in the middle school. For this study, four middle school science teachers of gifted students belonging to the gifted education professional organizations in a metropolis were selected, each of them was physics, chemistry, biology, and earth science teacher. Two of them were full-time teachers to teach only gifted students and two were part-time teachers who had taught general students in ordinary time and specially had taught the gifted students once a week. Qualitative data were collected through classroom observations, interviews, and documents. As a result, some unique characteristics of PCK's components were identified. The teachers' orientations to teaching science were closely correlated with PCK's components. The teachers' knowledges of science curriculum were different individually. But the decisions about type of teaching(acceleration or enrichment) were connected with the objectives of gifted education and lesson objectives. Also, the teachers' knowledges of science curriculum were influenced by the knowledge of students' understanding. Teachers used different instructional strategies according to the knowledge of science curriculum and the knowledge of students' understanding. We found that PCK's components were so closely connected and could show the direction of relationships among those PCK's components. We suggested teachers' PCK model which was named "Tetrahedron Model of PCK", to explain the characteristics and relationships of PCK's components.

뜨고 가라앉는 현상에 관련된 과학영재 교육프로그램이 영재학생들에게 미치는 효과 분석

이수덕,민희정,백성혜 부산대학교 사범대학 과학교육연구소 2012 교사교육연구 Vol.51 No.2

We developed science gifted education program related to the phenomena of floating and sinking phenomena, and analyzed the effects of this study. The concept of buoyancy force was represented as phenomena in the elementary school level science, and the concept of density was represented as formula calculation in middle school level science to explain floating and sinking materials. But the two concepts were not connected with each other in the textbooks. The subjects were 20 students of a science gifted class at a middle school located in Province. We surveyed their logic of proportion, the level of cognition, and the level of achievement before the instruction. And the conception test related to the floating and sinking phenomena was enforced before and after the instruction for identification of conception change. The problem solving ability test in a new situation and the students’ thought test related to the particle model carried out after the instruction, also. The education program was developed as a learning cycle and a discussion learning for understanding the relation between the buoyancy force and a volume, the density and a buoyancy force by students’ inquiry activity. As results, most of the students promoted understanding of the floating and sinking phenomena and changed the thoughts of particle model as polished viewpoint. 이 연구에서는 뜨고 가라앉는 현상과 관련된 영재교육프로그램을 개발하고, 프로그램의 효과를 알아보았다. 초등학교 과학에서는 현상 수준으로 부력의 개념을, 중학교에서는 공식 계산의 수준으로 밀도의 개념을 제시하여 물체의 뜨고 가라앉음을 설명하였으나, 이 두 개념을 연결 짓는 내용은 교과서에 제시하지 않았다. 연구 대상은 경기도 한 중학교의 영재학급 학생 20명이었으며, 수업 전에 이들의 비례논리, 인지수준, 학업성취수준을 알아보았다. 그리고 수업 전에 뜨고 가라앉는 현상에 관련된 개념 검사지를 투입하고 개념 변화를 알아보았다. 또한 새로운 상황에서의 문제 해결력을 알아보는 검사지와 입자모형에 대한 인식을 알아보는 검사지를 사후에 투입하였다. 개발한 영재교육 프로그램은 순환학습과 토론학습 형태로 학생들의 탐구활동을 통해 부력과 부피의 관계, 밀도와 부력의 관계 등을 이해할 수 있도록 구성하였다. 연구 결과,대부분의 경우 학생들의 배경 변인과 상관없이 뜨고 가라앉는 현상에 대한 이해도가 높아졌으며, 입자 모형에 대한 인식도 세련된 관점으로 변화하였다.

Expression of HERV-HX2 in Cancer Cells and Human Embryonic Stem Cells

Jung, Hyun-Min,Choi, Seoung-Jun,Kim, Se-Hee,Moon, Sung-Hwan,Yoo, Jung-Ki,Chung, Hyung-Min,Kim, Jin-Kyeoung The Korean Society of Animal Reproduction 2008 Reproductive & developmental biology Vol.32 No.2

The endogenous retrovirus-like elements (HERVs) found on several human chromosomes are somehow involved in gene regulation, especially during the transcription level. HERV-H, located on chromosome Xp22, may regulate gastrin-releasing peptide receptor (GRPR) in connection with diverse diseases. By suppression subtractive hybridization screen on SV40-immortalized lung fibroblast (WI-38 VA-13), we discovered that expression of HERV-HX2, a clustered HERV-H sequence on chromosome X, was upregulated in immortalized lung cells, compared to that of normal cells. Expression of HERV-HX2 was then analyzed in various cell lines, including normal somatic cells, cancer cells, SV40-immortalized cells, and undifferentiated and differentiated human embryonic stem cells. Expression of HERV-HX2 was specifically upregulated in continuously-dividing cells, such as cancer cells and SV40-immortalized cells. Especially, HERV-HX2 in HeLa cells was highly upregulated during the S phase of the cell cycle. Similar results were obtained in hES cells, in which undifferentiated cells expressed more HERV-HX2 mRNA than differentiated hES cells, including neural precursor and endothelial progenitor cells. Taken together, our results suggest that HERV-HX2 is upregulated in cancer cells and undifferentiated hES cells, whereas downregulated as differentiation progress. Therefore, we assume that HERV-HX2 may playa role on proliferation of cancer cells as well as differentiation of hES cells in the transcriptional level.

LIOUVILLE TYPE THEOREMS FOR TRANSVERSALLY HARMONIC AND BIHARMONIC MAPS

Jung, Min Joo,Jung, Seoung Dal Korean Mathematical Society 2017 대한수학회지 Vol.54 No.3

In this paper, we study the Liouville type theorems for transversally harmonic and biharmonic maps on foliated Riemannian manifolds.

[P2-54] Nutrients of Different Garlic Species

Jung-Hye Shin,Min-Jung Kang,Seoung-Mi Yang,Seong-Hun Jeong,Nak-Ju Sung,Soo-Jung Lee 한국식품영양과학회 2009 한국식품영양과학회 학술대회발표집 Vol.2009 No.11

TRANSVERSE KILLING FORMS ON A KÄAHLER FOLIATION

Jung, Seoung-Dal,Jung, Min-Joo Korean Mathematical Society 2012 대한수학회보 Vol.49 No.3

On a closed, connected Riemannian manifold with a K$\ddot{a}$ahler foliation $\mathcal{F}$ of codimension $q$, any transverse Killing $r$-form ($2{\leq}r{\leq}q$) is parallel.

ON TRANSVERSALLY HARMONIC MAPS OF FOLIATED RIEMANNIAN MANIFOLDS

Jung, Min-Joo,Jung, Seoung-Dal Korean Mathematical Society 2012 대한수학회지 Vol.49 No.5

Let (M,F) and (M',F') be two foliated Riemannian manifolds with M compact. If the transversal Ricci curvature of F is nonnegative and the transversal sectional curvature of F' is nonpositive, then any transversally harmonic map ${\phi}:(M,F){\rightarrow}(M^{\prime},F^{\prime})$ is transversally totally geodesic. In addition, if the transversal Ricci curvature is positive at some point, then ${\phi}$ is transversally constant.