• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.472-472
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• 2013

본 논문은 InN와 GaN를 교대로 증착하는 교번성장법을 이용해 제작한 4주기 InN/GaN 박막의 구조적, 광학적, 특성을 X-ray diffraction, Atomic force microscopy, Transmission electron microscopy과 저온 Photoluminescence (PL) 장비를 사용하여 분석한 결과를 보고한다. Fig. 1은 4주기 InN/GaN박막의 XRD 스펙트럼으로 GaN(0002)와 InN(0002)의 회절 신호를 관찰할 수 있다. 그러나 두 피크뿐만 아니라 InN와 GaN 사이에 구분이 되지 않은 추가 신호를 확인할 수 있다. 추가신호는 InN와 GaN 계면에서 발생하는 상호확산 확률로서 해석할 수 있다. Fig. 2는 다양한 조건에서 성장한 InN/GaN 시료의 PL스펙트럼으로 방출 파장은 각각 1,380, 1,290, 1,280, 1,271, 1,246 nm로 측정되었다. 성장 조건 변화에 따른 발광특성 변화를 박막에서 III족 원자 특히, In 원자의 성장 거동에 따른 구속준위(Localized states) 변화로 논의할 예정이다.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.2 no.2
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• pp.1-1
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• 1992

YIG(Yttrium Iron Garnet) single crystals were grown by FZ(Floating Zone) method. Since YIG melts incongruently, TSFZ(Traveling Solvent Floating Zone) method which was modified FZ was applied to grow YIG single crystals. The optimum growth condition were growth rate Imm/hr, counter-rotation 30rpm and oxidized atmosphere was necessary to sintering and growth process. The quality of grown crystals depended on the degree of sintering. The voids were generated by the reaction of Fe ions with oxygen and the density of voids was increased with the growth rate increased. When the growth rate was more than 1.5mm/hr, the cellular growth occured and the density of dislocation was increased at the periphery of crystals. Also, secondary phases of orthoferrite(YFe$O_3$)compost ion were observed in the grown crystal.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11b
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• pp.500-505
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• 1996

고온의 정상상태에서 조사된 후 재조직(restructuring)과 균열(cracking)이 일어난 핵연료 내에서 결정립 외부 공극의 을 결정할 수 있는 퍼콜레이션(Percolation) 모델을 개발하였다. 핵연료 펠렛은 다수의 작은 정육각형 결정립들로 구성된 큰 정육각형으로 모의한다. 핵연료봉은 형상과 열적 특성이 다른 네 개의 영역으로 구분하고 각 경계 위치를 임계온도로부터 계산한다. 공극의 상호연결분율은, 몬테카를로 방법으로써 싸이트(Site)의 채워짐 여부를 점검하고 Hoshen-Kopelman 방법으로써 자유 공간에 연결된 클러스터(Cluster)에 포함된 싸이트들의 수를 계산하여 채워진 싸이트의 총 개수에 대한 연결 싸이트들의 개수의 비로써 구한다. AECL-2230, CBX 핵연료봉 실험의 기체 방출분율 자료에 대하여, FASTGRASS 코드의 상호연결분율 함수를 영역별로 계산한 상호연결분율로 대치하여 계산한 결과와 비교하였다. 균열과 재조직은 핵분열 기체 방출에 상당히 영향을 미치는 것으로 나타났다. 이 모델의 주요 장점은 결정립계에서의 상호연결현상을 단순 상호연결분율보다 좀더 사실적으로 모의하며 결정립의 성장과 균열을 고려할 수 있다는 점이다.

• Survey Research
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• v.18 no.4
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• pp.25-59
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• 2017

The current study investigated how elderly husbands and wives' marital satisfaction and depression change over time and examined how changes in marital satisfaction account for changes in depression between and within the dyads. The longitudinal dyadic data from the first wave(2006) to the fifth wave(2014) of the Korean Longitudinal Study of Aging(KLoSA), collected by the Korea Employment Information Service, were used for the analyses. Because husbands and wives are interdependent within couples, we applied statistical models for dyadic data. The dyadic growth model(DGM) was used to model the trajectories of marital satisfaction and depressive symptoms. In order to analyze the association of these growth factors, we proposed the dyadic growth actor-partner interdependence model(DG-APIM) and applied the model to the data. The results showed that on average the husbands' marital satisfaction was higher but decreased faster over the course of the study than the wives'. It also showed that the average depression of the husbands was lower than that of the wives but the husbands' depression increased faster than the wives' over the course of the study. The variance of the averages of husbands' (wives's) depression was accounted for by that of wives'(husbands') marital satisfaction, showing a partner effect. The variance of the slopes of husbands'(wives') depression was accounted for by that of marital satisfaction of themselves, showing an actor effect. The results showed that there is a longitudinal interdependence between husbands and wives' marital satisfaction and depression and supported the marital discord model of depression.

• Development and Reproduction
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• v.4 no.2
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• pp.137-145
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• 2000

The regulatory mechanisms of the initiation and the formation of ovarian follicles during fetal stage of mammals are largely unknown. In addition to the gonadotropins secreted from pituitary, various growth factors, and steroid hormones are believed to be involved in the differentiation and initiation of growth of primordial follicles consisting of primordial germ cells migrated from yolk sac and streamed cells from mesonephric somatic cells. In human, primordial follicles that have already initiated differentiation at fetal stage undergo either folliculogenesis to ovulate or atresia after growth. Some of primordial follicles remain without growth for 50 years or longer. The objective of this paper is to review the mechanism of the formation, growth arrest, and initiation of primordial follicles in human fetal and neonatal ovaries.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.8 no.4
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• pp.539-543
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• 1998

The relationship of growth-in defects such as crystal originated particles (COP), flow pattern defects(FPD), laser scattering tomography defects (LSTD) was investigated in Cz-Si single crystals which had different pulling speed during crystal growing. It is concluded that the density and radial distribution of grown-in defects is strongly dependent on the pulling speed. And as the generation areas of these grown-in defects in a wafer are identical in radial position, they can be generated from same origin during crystal growing.

• The KIPS Transactions:PartB
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• v.12B no.1 s.97
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• pp.101-108
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• 2005

Most of the plant models based on L-system or particle systems have focused on visual shape of plant. However, the interaction between the plant and its environment in virtual environment will make the plant more natural in diverse situations so that users will be immersed in system. To this end we structure the plant object organized in an ontology, introduce calculating method of plant growth rate based on juvenile energy.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.165-176
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• 2012

Despite the gradual growth of mobile markets according to an increased mobile distribution rate, empirical studies on the mobile shopping application markets are not sufficient. From the viewpoint of a large number of purchase of brand product in department store by customers and a high growth rate of mobile shopping by means of mobile shopping, we classified a principle variable, the interactivity, into three levels and verified the effects of the interactivity on the flow, effects of the flow on the purchase intention and the control effect of purchase level. In conclusion, among the three levels of the interactivity the customer-customer interactivity and the content-customer interactivity have positive effects on the flow, but company-customer has not. On the other hand, the customer-customer interactivity and the content-customer interactivity have a positive effect on the flow. Furthermore, the flow affects the purchase intention positively. After the verification of the direct effect of interactivity on the purchase intention, the content-customer interactivity only has a positive effect on the purchase intention. Lastly, the purchase level has a control effect when the customer-customer interactivity has a positive effect on the flow.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.300-309
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• 2020

This study identified the types and dimensions of faculty-student interaction (FSI). A narrative methodology was applied within the qualitative research paradigm. Data was collected using individual in-depth interviews involving 10 students who had experiences of faculty-student interaction more than 6 times over the prior 6 semesters. Data was analyzed according to actors' perspectives, the motivation of actions, and actions toward goal achievement. Three major types of faculty-student interactions emerged from our analysis. First, the initiative interaction type reflects active characteristics of the narrator within FSI and is goal achievement-oriented. Second, the stereotyped interaction was characterized as a unified reaction to the FSI and not significantly related to self-development. Lastly, the reciprocal interaction reflected characteristics of narrators who had potential and flexibility for self-development in the circumstances involving support from professors. The results of this study indicate that faculty-student interaction does not represent the best way to support students for their successful school lives. Faculty needs professionality and sensitivity for student teaching, and students must exhibit curiosity and activeness in developing their knowledge. Positive outcomes from the FSI will be expected in supportive school environments.

• Transactions of the Korean Society of Automotive Engineers
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• v.2 no.4
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• pp.1-8
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• 1994

이 논문에서 우리는 발전하는 전단층의 2차원 Wave Mode에 대한 비선형 상호작용에 대한 문제를 다루었다. 총 위상각은 Wave Mode ij와 k$\ell$의 상응하는 에너지와 위상 상호작용을 조절한다. 그러므로 이 논문의 목적은 전단층에서 Lange-Scale 구조의 초기 위상각의 효과를 조사하고자 하는 것이다. 이 연구에서 우리는 Subharmonic의 존재는 전단층의 성장에 상당한 영향을 준다는 것을 알았고 Entrainment에서도 증가하는데 영향을 준다는 것을 알았다. 우리는 또한 Mean Flaw와 Fundamental의 다른 초기 위상각의 효과는 Subharmonic이 성장하는 먼 Downstream 영역에서 보여지기 시작한다는 것을 알았다.