• 한국보육지원학회지
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• 제16권5호
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• pp.1-26
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• 2020

Objective: This study investigated 5-year-old children's developmental levels for creative and social personalities according to gender, and whether participation in STEAM-based unplugged robotic activities can improve their creative and social personalities. Methods: Participants were 5-year-old children (N=125) from 11 child care centers. The experimental group included 29 boys and 24 girls enrolled in classrooms that implemented an unplugged activities curriculum over five weeks. The control group consisted of 38 boys and 34 girls. Data were analyzed using a t-test and analysis of covariance, and Hedges' g was used to measure effect size. Results: First, the participating children's mean scores on creative and social personalities were 3.20 and 3.53 on a 5-point Likert scale, respectively. Girls scored higher than boys in sensitivity-various interests and imagination-playfulness domains of creative personality and all three domains of social personality. Second, children in the experimental group showed improvement in all domains of social personality and the effect size was large. They also improved in three domains (openness-humor, imagination-playfulness, independency-immersion) of creative personality, although the effect size was small. Conclusion/Implications: The results imply that implementing a robotics curriculum with unplugged play activities in early childhood classrooms contributes to 5-year-old children's development of creative and social personalities.

• Journal of Microbiology and Biotechnology
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• 제19권12호
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• pp.1628-1634
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• 2009

Small heat shock proteins (sHSPs) function as molecular chaperones that protect cells against environmental stresses. In the present study, the genes of hsp17.6 and hsp17.7, cytosolic class I sHSPs, were cloned from a tropical plant, Ageratina adenophorum. Their C-terminal domains were highly conserved with those of sHSPs from other plants, indicating the importance of the C-terminal domains for the structure and activity of sHSPs. The recombinant HSP17.6 and HSP17.7 were applied to determine their chaperone function. In vitro, HSP17.6 and HSP17.7 actively participated in the refolding of the model substrate citrate synthase (CS) and effectively prevented the thermal aggregation of CS at $45^{\circ}C$ and the irreversible inactivation of CS at $38^{\circ}C$ at stoichiometric levels. The prior presence of HSP17.7 was assumed to suppress the thermal aggregation of the model substrate CS. Therefore, this report confirms the chaperone activity of HSP17.6 and HSP17.7 and their potential as a protectant for active proteins.

• Communications for Statistical Applications and Methods
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• 제31권2호
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• pp.191-202
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• 2024

The goal of this paper is to show how multivariate regression analysis with high-dimensional responses is facilitated by the response dimension reduction. Multivariate regression, characterized by multi-dimensional response variables, is increasingly prevalent across diverse fields such as repeated measures, longitudinal studies, and functional data analysis. One of the key challenges in analyzing such data is managing the response dimensions, which can complicate the analysis due to an exponential increase in the number of parameters. Although response dimension reduction methods are developed, there is no practically useful illustration for various types of data such as so-called large p-small n data. This paper aims to fill this gap by showcasing how response dimension reduction can enhance the analysis of high-dimensional response data, thereby providing significant assistance to statistical practitioners and contributing to advancements in multiple scientific domains.

• Journal of the Korean Data and Information Science Society
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• 제20권1호
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• pp.77-87
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• 2009

최근 들어 소지역 추정 문제를 해결하는데 베이지안 방법이 주목을 받고 있다. 본 논문에서는 고객집단별 보험금에 대한 실제 자료를 MCMC 기법을 통한 계층적 베이지안 모형과 일원분류, GLM-Normal, GLM-Gamma 모형으로 분석하여 그 결과를 비교하였다. 결론적으로 소지역 추정에 의하여 얻어진 보험금 추정량이 다른 방법으로부터 얻어진 추정량들과 비교하여 가장 합리적이고 좋은 추정량임을 보일 수 있었다. 특히, 표본 수가 적은 집단에 대하여 소지역 추정의 정확성이 현저하게 높음을 알 수 있었다.

• 과학교육연구지
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• 제36권2호
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• pp.394-407
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• 2012

국가수준 학업성취도 평가에 나타난 중학교 3학년 학생들의 과학과 학업성취도를 분석한 결과는 다음과 같다. 첫째, 기초학력 미달에 속하는 학생의 비율이 8.1%로 그 비율이 높았다. 이것은 많은 수의 중학교 학생들이 국민공통기본교육과정이 규정한 국민으로서 갖추어야할 최소한의 과학적 소양에 도달하지 못하고 있음을 의미한다. 둘째, 기초학력 미달에 속하는 학생의 비율에서 남학생이 여학생보다 두 배 정도 많았다. 즉, 기초학력 미달 학생 중 남학생이 10.4%로 여학생의 5.5%보다 2배정도 높았다. 셋째, 성별에 따른 성취도 분석 결과여학생이 197.55점으로 남학생의 195.09점보다 높았다. 또한 여학생들의 표준편차가 남학생들보다 작아 여학생들의 점수가 남학생들에 비해 평균 가까이에 분포하였다. 내용 영역별로 분석한 결과도 여학생의 정답률이 남학생의 정답률보다 운동과 에너지, 물질, 생명, 지구와 우주 영역에서 모두 높았다. 뿐만 아니라 행동 영역별 분석 결과도 지식 영역의 하위 영역인 이해 이외의 모든 지식 영역과 탐구 영역의 하위 영역에서 여학생의 정답률이 남학생의 정답률보다 높았다. 끝으로, 지역별 성취도를 보면 중 소도시가 196.81점으로 가장 높았고, 대도시가 196.15점, 읍 면지역이 194.86점이었다. 한편 표준편차는 대도시가 33.73점으로 가장 컸으며, 중 소도시 33.70점, 읍 면지역 32.92점이었다. 대도시와 중 소도시의 학생들이 읍 면지역 학생들에 비해 과학과 성취도가 높긴 하지만 학생들 간의 학력 격차 또한 크게 나타났다.

• 대한수학회지
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• 제49권6호
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• pp.1273-1299
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• 2012

We prove the global regularity of weak solutions to a conormal derivative boundary value problem for quasilinear elliptic equations in divergence form on Lipschitz domains under the controlled growth conditions on the low order terms. The leading coefficients are in the class of BMO functions with small mean oscillations.

• 한국주거학회논문집
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• 제24권4호
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• pp.83-96
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• 2013

With the recent increase in the number of one- and two-person households, demand for small-sized apartments has been on the rise, and lifestyles have seen swift changes to cater to smaller-sized housing. The construction market is shifting toward small-sized apartments, and research is now needed on the lifestyles of those living in small-sized apartments in order to develop suitable housing units. Therefore, this study aims to produce a planning concept for housing units by lifestyle, categorizing residents based on lifestyle and identifying their LDK preferences. Regarding methodology, prior research was reviewed to validate housing-related lifestyle factors and study the lifestyles of those living in small-sized apartments. Lifestyle categories based on housing type were determined by a cluster analysis, and LDK preferences for each lifestyle were analyzed through a survey. These data were then used to propose a planning concept with small-sized apartments for each lifestyle type. Thirty-two factors for categorizing lifestyles were obtained by studying three domains of housing-related lifestyle factors: 'housing values', 'attitudes toward living space', and 'behavior in living space; A total of 648 people living in small-sized apartments were classified into three lifestyle groups: 'True Family Benefiters', 'Smart Shopaholics', and 'Slow Heritage Pursuers'. 'Each group's lifestyle characteristics and socio-demographic features were used to classify the lifestyles of those living in small-sized apartments. The LDK preferences for each lifestyle were analyzed to design a planning concept for small-sized apartment.

• 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.

• Journal of Microbiology and Biotechnology
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• 제19권2호
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• pp.140-146
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• 2009

MAPSI(Management and Analysis for Polyketide Synthase Type I) has been developed to offer computational analysis methods to detect type I PKS(polyketide synthase) gene clusters in genome sequences. MAPSI provides a genome analysis component, which detects PKS gene clusters by identifying domains in proteins of a genome. MAPSI also contains databases on polyketides and genome annotation data, as well as analytic components such as new PKS assembly and domain analysis. The polyketide data and analysis component are accessible through Web interfaces and are displayed with diverse information. MAPSI, which was developed to aid researchers studying type I polyketides, provides diverse components to access and analyze polyketide information and should become a very powerful computational tool for polyketide research. The system can be extended through further studies of factors related to the biological activities of polyketides.

• 한국소음진동공학회논문집
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• 제21권10호
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• pp.967-974
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• 2011

The direct and indirect PFBEM(power flow boundary element method) for the treatment of the 3 dimensional multi-domain problems are proposed to predict the acoustic energy density in medium to high frequency ranges. In the proposed method, the equation is derived in a matrix form by considering coupled relationships of the power flow at the interface of given domains. The proposed method can successfully obtain the analytical solutions for the problems of coupled cubes and the small-scale reverberant chamber. Then the experiment is carried out to obtain STL(sound transmission loss) by using small-scale reverberant chamber and the results are compared with analysis results.