• 대한안전경영과학회지
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• 제23권1호
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• pp.71-79
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• 2021

The railroad facilities are intended for long-term operation as the initial acquisition costs necessary for infrastructure construction are high. Therefore, regular maintenance of railroad facilities is essential, and furthermore, system reliability through systematic performance evaluation is required. In this study, the signal control system of railroad electrical equipment was selected as the subject of research and the performance evaluation target facility selection study was conducted using AHP. The results of the study can contribute to the reliability of the signal control system as well as to the reliability of the railroad system, which is a higher system.

• 한국치위생학회지
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• 제21권5호
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• pp.639-644
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• 2021

Objectives: The purpose of this study was to analyze the factors that affected the number of citations for articles published in the Journal of Korean Society of Dental Hygiene based on previous studies. Methods: Information on papers including the number of citations was collected using a web crawling technique. The effect of the number of author keywords, the number of Medical Subject Headings (MeSH) keywords, MeSH match rate, abstract word count and keyword-abstract ratio on the number of citations was analyzed by multiple regression analysis. Results: The use of the MeSH keyword did not have a significant effect on the number of citations. Among the other factors, only the keyword-abstract ratio was statistically significant. Conclusions: Select a topic of constant interest in the field, write the title in detail using colons or asterisks if necessary, and do not repeat the words used in the title in keywords. Select specific keywords deeply related to the topic. In particular, choice words or phrases that are frequently used in the abstract. If the MeSH keyword selection contradicts the previous strategies, boldly give up the MeSH keyword.

• Communications for Statistical Applications and Methods
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• 제29권1호
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• pp.65-83
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• 2022

Although various statistical methods have been developed to map time-dependent genetic factors, most identified genetic variants can explain only a small portion of the estimated genetic variation in longitudinal traits. Gene-gene and gene-time/environment interactions are known to be important putative sources of the missing heritability. However, mapping epistatic gene-gene interactions is extremely difficult due to the very large parameter spaces for models containing such interactions. In this paper, we develop a Gaussian process (GP) based nonparametric Bayesian variable selection method for longitudinal data. It maps multiple genetic markers without restricting to pairwise interactions. Rather than modeling each main and interaction term explicitly, the GP model measures the importance of each marker, regardless of whether it is mostly due to a main effect or some interaction effect(s), via an unspecified function. To improve the flexibility of the GP model, we propose a novel grid-based method for the within-subject dependence structure. The proposed method can accurately approximate complex covariance structures. The dimension of the covariance matrix depends only on the number of fixed grid points although each subject may have different numbers of measurements at different time points. The deviance information criterion (DIC) and the Bayesian predictive information criterion (BPIC) are proposed for selecting an optimal number of grid points. To efficiently draw posterior samples, we combine a hybrid Monte Carlo method with a partially collapsed Gibbs (PCG) sampler. We apply the proposed GP model to a mouse dataset on age-related body weight.

• 대한화학회지
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• 제55권6호
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• pp.1030-1041
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• 2011

본 연구에서는 사범대학 과학교육과에 재학 중인 예비 과학 교사들을 대상으로 중학교 교육과정에 해당하는 화학 개념의 이해도를 조사하고 예비 과학 교사들의 배경변인에 따른 답지 반응 분석을 실시하였다. 연구 결과, 오답을 선택하는 예비 과학 교사들이 모든 문항에서 나타났으며, 문제를 해결했더라도 각 문항의 해결에 필요한 개념을 충분히 이해하지 못하는 예비 과학 교사들이 있음을 알 수 있었다. 그리고 특정 문항에 대해서는 예비 과학 교사들이 고등학교 시절 대학수학능력시험의 선택 과목으로 화학을 선택한 것과 상관없이 정답률이 낮았다. 이 결과의 원인을 찾기 위한 심층질문을 통해 몇 가지 사실을 알 수 있었다. 첫째, 중학교 학생들이 가지고 있는 오개념을 예비 과학 교사들도 가지고 있었다. 둘째, 대학수학능력시험 선택 과목으로 화학 선택 유무에 따라 정답률에 차이가 없었다. 셋째, 개념에 대한 본질적 이해 전에 계산을 통한 문제 풀이나 단순 기억에 의해 문제를 해결하려는 학습 습관은 오개념 형성에 영향을 주었으며, 형성된 오개념은 대학생이 되어도 지속적으로 나타나는 경향이 있었다.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 추계학술발표대회 논문집
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• pp.49-53
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• 2007

Children's museum has roles of the characterized place for children as well as the museum for education. Therefore, specific color selection especially for children is one of the most important points to be considered. This study is the short investigation on various interior color systems of children's museums in Korea. In case of Children's Museum in National Museum of Korea, each exhibition area is apparently divided by adopting colors in accord with the subject of each space. Middle color in that museum generally gives stability, and clear color and accent color give better perception and vitality Children's folk Museum has adopted Korean traditional colors, O-Bang Colors, which have indicated Korean tradition for ages. All sections in Incheon Children's Museum are spatially divided, but similar colors of ceiling, wall, and floor give boring atmosphere. Since original colors of furniture in Science section distract attraction of children, proper color selection should be required for better reaction from children. Therefore, this research is aiming for detailed investigation in color system of children's museum and the proper interior color planning of the next children's museums with their main purpose for children in the future.

• 한국과학교육학회지
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• 제12권1호
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• pp.103-118
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• 1992

Quality control of science teachers seems to be one of the most important tasks to improve the quality of science education in Korea. The purposes of this study, as a survey, were to identify characteristics of good science teachers and to make an outline of preservice teacher education curriculum for cultivating the characteristics from inserivce secondary science teachers. A questionnaire was developed for this study and distributed to 176 inservice teachers. It had three parts: 1) characteristics of good science teachers, 2) weights of preservice curriclum areas, and 3) weights of college courses. The means and standard deviations of teachers' responses were calculated. To test the differences between teacher variables, t-tests were executed. The inservice teachers perceived that the junior-high school teacher's characteristics should be different from the senior-high school teacher's. Characteristics, such as enthusiasm toward teaching or students, subject knowledge, content selection and organizing skill, teaching techniques, and scientific worldview were ranked within top five of good science teacher's chracteristics. The teachers' perception about preservice curriculum were as follows: 1) present weight of liberal arts area should be reduced: 2) weight of content area for junior-high school teachers should be different from that for senior-high school teachers: 3) present weight of pedagogy area should be increased: 4) present weight of science education area should be increased: and 5) many courses in pedagogy and sciencd education areas need to be changed, Based on the data and disussion, a conceptual model for preservice teacher education curriculum was proposed.

• Journal of Plant Biotechnology
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• 제36권2호
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• pp.106-114
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• 2009

Genetic components introduced into approved GM crops are a key subject for safety assessment and provide a basis for the development of detection methods for GM crops. In order to understand the genetic components in approved GM crops comprehensively, we screened the genetic vector maps of GM crops that had been approved for commercialization around the world. A total of 64 varieties from 5 major GM crop species (maize, canola, cotton, soybean, and tomato) were subjected to analysis. The genetic components included genes, promoters, terminators, and selection marker. This survey may be useful for researchers who develop GM crops and methods for detecting GM crops.

• 기술혁신학회지
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• 제13권3호
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• pp.587-616
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• 2010

한국의 기초과학연구는 해방 후 백지상태에서 2008년 66,000 여 명의 이공계 대학 연구인력과 36,000여 SCI논문을 발표할 정도가 되었다. 통계가 존재한 1970년대 초를 기준으로 본다면 이공계 대학 연구인력은 38배, SCI논문은 1,317배 증가한 것이다. 본고는 이러한 현상의 전개과정과 발전동인에 대한 분석이다. 백지에서 출발한 기초과학연구라 정책이 가장 중요한 역할을 하였다고 평가되기도 하나, 본고에서는 정책의 세부내용이 무엇이고, 그 정책은 어떤 배경이 있었나를 검토한 것이다. 구체적 기초과학연구의 발전 연표를 작성하고, 이 연표에 속한 사건들이 가진 상황적인 나아가 정책적인 의미를 분석하는 방법을 택했다. 한국의 기초과학연구는 5기의 기간으로 구성됨과 핵심적으로 한 사건 15개가 있음을 보였다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권4호
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• pp.508-518
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• 2019

Objective: This research aimed to determine biological pathways and protein-protein interaction (PPI) networks for 305-d milk yield (MY), 305-d fat yield (FY), and age at first calving (AFC) in the Thai multibreed dairy population. Methods: Genotypic information contained 75,776 imputed and actual single nucleotide polymorphisms (SNP) from 2,661 animals. Single-step genomic best linear unbiased predictions were utilized to estimate SNP genetic variances for MY, FY, and AFC. Fixed effects included herd-year-season, breed regression and heterosis regression effects. Random effects were animal additive genetic and residual. Individual SNP explaining at least 0.001% of the genetic variance for each trait were used to identify nearby genes in the National Center for Biotechnology Information database. Pathway enrichment analysis was performed. The PPI of genes were identified and visualized of the PPI network. Results: Identified genes were involved in 16 enriched pathways related to MY, FY, and AFC. Most genes had two or more connections with other genes in the PPI network. Genes associated with MY, FY, and AFC based on the biological pathways and PPI were primarily involved in cellular processes. The percent of the genetic variance explained by genes in enriched pathways (303) was 2.63% for MY, 2.59% for FY, and 2.49% for AFC. Genes in the PPI network (265) explained 2.28% of the genetic variance for MY, 2.26% for FY, and 2.12% for AFC. Conclusion: These sets of SNP associated with genes in the set enriched pathways and the PPI network could be used as genomic selection targets in the Thai multibreed dairy population. This study should be continued both in this and other populations subject to a variety of environmental conditions because predicted SNP values will likely differ across populations subject to different environmental conditions and changes over time.

• 한국문헌정보학회지
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• 제4권
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• pp.1-26
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• 1975

The present study is a literature survey aimed at . providing a means to improve the bibliographic apparatuses for Korean studies. The need for a study like this has proven urgent with the promotion of Korean studies both within and without in recent years. The study examines the social science literature on Korea produced in English between 1876 and 1945(A study is under way for literature since 1945 also). Selection of the titles for investigation was made on the basis of the relative importance of the works confirmed after reading book reviews and examining a variety of bibliographies. Each title selected was examined in terms of its subject matter, contribution to the discipline it belongs, references cited, relations with similar works in the field, and bibliographic features. Published books, dissertations both published or not published, and periodicals are included. Primarily a critical review it is also designed to provide background information on the present status of Korean studies and the historical development of Western studies on Korea. Special attenttion is given to the factors contributing to the foundations of the modern Western scholarchip on Korea in the late 19th century.