• 컴퓨터교육학회논문지
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• 제19권2호
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• pp.21-29
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• 2016

교육용 프로그래밍 언어의 도입은 다양한 학습활동을 전개할 수 있도록 교육환경을 변화시켰다. 이러한 학습 활동들이 프로그래밍 학습에 어느 정도 효과가 있는지 분석할 필요가 있다. 이를 위해 8가지 주요 학습 활동 주제별로 메타 분석 하였다. 연구 대상은 1993년부터 2015년까지 논문지에 게재된 프로그래밍 교육 논문이다. 분석 기준에 부합하는 총 44편의 논문에서 추출한 77개의 연구 자료를 선정했다. 본 연구의 주요결과를 살펴보면, 인지적 영역과 정의적 영역에서 .595와 .594로 중간 수준의 효과 크기를 나타냈다. 인지적 영역에서는 학습 주제별 유의한 차이는 없으나 수리, 시뮬레이션, 애니메이션 영역에서 중간 수준의 효과크기로 비교적 일관된 결과를 나타냈다. 정의적 영역에서는 학습 주제별 효과크기는 유의한 차이는 없지만, 개별 연구 간에 그리고 학습 주제 간에 동질성이 높게 나타났다. 이러한 연구 결과를 바탕으로 시사점을 제시하였다. 첫째, 학습자들은 다양한 학습 활동 주제에 따라 학습하는 것이 바람직하다. 둘째, 교수자들은 시뮬레이션, 애니메이션, 수리 활동에 주목할 필요가 있다. 셋째, 연구자들은 효과적인 학습을 위해 다른 요인을 찾아보는 연구가 필요하다.

• 한국간호교육학회지
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• 제21권3호
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• pp.308-319
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• 2015

Purpose: The purpose of this study was to identify the effects size of simulation education targeting korean nurses and nursing students. Methods: Meta-analysis was conducted with 48 papers in domestic master and doctorate degree dissertations and academic journals from 2000 to 2014. Results: The entire effect size in simulation education was relevant to big effect size. Regarding the effect size of individual variables, nurse was identified to have biggest effect size in study subject, standardized patient was identified to have biggest effect size in simulation methods and pediatric nursing was identified to have biggest effect size in study subjects. Effect size in each effect variable was highest in psychomotor domain. Conclusion: This study identified the effect size of simulation education and provided the basic data to contribute to the quality improvement of simulation education which is based on the reasons.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2003년도 추계학술발표강연 및 논문개요집
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• pp.142-142
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• 2003

The effects of film thickness on the dipolar relaxation of ferroelectric PbTiO$_3$ films were investigated in the microwave-frequency range. The dielectric constants ($\varepsilon$) and the dielectric losses (tan $\delta$) were successfully measured up to 30 ㎓ using interdigital capacitors. The PbTiO$_3$ thin films were deposited on the quartz substrate at room temperature and postannealed in oxygen atmosphere. As the film thickness increased, its grain size and tetragonality were enhanced. And the dipolar relaxation behavior began to appear in the thin films with approximately 20 nm thickness, since ferroelectric domains could not be formed hi small grains. The observed relaxation frequency (above 10 ㎓) was higher than the previous values reported in bulk ceramics. It can be correlated with the extremely small domain size of the thinfilms as shown by TEM. And, the Rayleigh constant [1] from domain wall motions was alsoinvestigated by LCR meter at 100 KHz.

• 한국컴퓨터산업학회논문지
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• 제3권12호
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• pp.1669-1678
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• 2002

대칭 영역 탐색은 대칭 정보를 이용하여 사전 정보없이 얼굴영역을 추출 할 수 있다. 그러나 눈, 코, 입등과 같은 얼굴의 특징 부위보다 탐색할 마스크의 크기가 커져야 함으로 이 방법은 계산 시간이 많이 걸린다. 본 논문에서는 얼굴 영상에 대하여 사전 정보 없이, 적은 계산량으로 얼굴 영역 추출이 간으하도록 대칭 영역 탐색을 이용한 축소 영상에서의 얼굴 영역의 추출과 그 특징에서의 대칭값에 따른 영상을 이용하여 원영상에서는 영역 분할을 통한 얼굴 영역 추출 방법을 제안하고 실험을 통하여 이를 확인하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.1036-1038
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• 2001

The sapphire orientation dependence of the crystallization of ZnO thin films has been studied using real-time synchrotron x-ray scattering. The amorphous ZnO thin films with a 2400-${\AA}$-thick were grown on sapphire(110) and sapphire(001) substrates by radio frequency magnetron sputtering at room temperature. The amorphous ZnO films were crystallization into epitaxial ZnO(002) grains both on the sapphire(110) and on the sapphire(001) substrates. The epitaxial quality, such as mosaic distribution and crystal domain size, of the ZnO grains on the sapphire(110) is high, similar to that of the ZnO grains on the sapphire(001). With increasing the annealing temperature to 600$^{\circ}C$, the mosaic distribution and the crystal domain size of ZnO(002) grains in the film normal direction was improved and decreased, respectively.

• 한국세라믹학회지
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• 제52권1호
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• pp.61-65
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• 2015

The effect of Sr addition on the flexural strength of bulk SiOC ceramics was investigated in polymer-derived SiOC ceramics prepared by conventional hot pressing. Crack-free, dense SiOC discs with a 30 mm diameter were successfully fabricated from commercially available polysiloxane with 1 mol% strontium isopropoxide derived Sr as an additive. Agglomerates formed after the pyrolysis of polysiloxane led to the formation of domain-like structures. The flexural strength of bulk SiOC was strongly dependent on the domain size formed and Sr addition. Both the minimization of the agglomerate size in the starting powders by milling after pyrolysis and the addition of Sr, which reinforces the SiOC structure, are efficient ways to improve the flexural strength of bulk SiOC ceramics. The typical flexural strength of bulk Sr-doped SiOC ceramics fabricated from submicron-sized SiOC powders was ~209 MPa.

• 대한화학회지
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• 제16권3호
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• pp.135-141
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• 1972

In the past years, a number of theories have been published to elucidate the structure of liquid water. common to most of these theories is that water mainly consist of several different kinds of clusters and also hydrogen bonds in water may be bent to some degree. Recentrly, in a series of paper, Jhon and Eyring successfully explained thermodynamic, dielectric, surface and transport properites of water, assuming that it contains small domains of about 46 molecules. According to the theory, the cluster size does not change with temperature, but the cluster concentration changes. In this paper, the potential function for the hydrogen bond, the dispersion energy and dipole-dipole interaction terms. The calculated results show that the domain of nearly 46 molecules is energetically most probable, and its size is independent of temperature. And also, we evaluated the effect of angel variation of the bent hydrogen bond. In addition, the relaxation energy different for ice and water is also explained by this method.

• 산업기술연구
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• 제26권B호
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• pp.207-213
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• 2006

Mobility Anchor points are used for the mobility management in HMIPv6 networks. Currently a mobile node selects the MAP farthest away from itself as a new MAP among available candidates when it undertakes a macro hand off. With this technique, however, the traffic tends to be concentrated at a MAP with the largest domain size and the communication cost increases due to the distance between the mobile node and the MAP. In this work, we propose a novel scheme to select a MAP to minimize the communication cost, taking the mobile node's moving speed and data rate into account. To come up with the scheme we analyses the communication analyses the communication cost into the binding update cost and the data packet delivery cost, and derive an equation representing the optimal MAP domain size to minimize the total cost.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 춘계 종합학술대회 논문집
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• pp.369-373
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• 2005

본 논문은 기존의 주파수 영역 독립 성분 분석(FDICA : frequency domain independent component analysis) 방법에 가변 적응 상수를 이용한 알고리즘을 제안한다. 여러 반향 환경에 대한 모의실험으로 기존의 temporal structure(TA)알고리즘, FDICA알고리즘과 비교하여 그 분리 성능을 평가하고 비교한다. 실제 녹음한 혼합 음원에 대한 분리정도를 비교 분석한다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제55권6호
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• pp.334-338
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• 2006

The finite volume time domain(FVTD) method gives accurate results for the calculation of electromagnetic wave propagation but it should be noted that the number of sampling points per wavelength should be increased when more accurate numerical results are required. Moreover it requires large amount of computer memory resources. In this paper we propose a modified FVTD that employs a time subdivision. The local time-subdivided FVTD(FVTD-LTS) method is enough to divide the space domain grid with a large step size. This method can reduce computation time and memory resources. To validate the proposed method, sever numerical examples are presented. We have then shown that the proposed method yields a reasonable solution.