• 한국보육지원학회지
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• 제14권5호
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• pp.85-99
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• 2018

Objective: This purpose of this study was to analyze articles and research trends in children's free-choice activities in major domestic journals published from 1998 to 2017. Methods: Registered research papers in academic journals from 1998 to 2017 for the National Research Foundation of Korea were analyzed in terms of trends in their annual submission numbers, research subject, research type, research area. and research theme. Results: The quantity of the studies has more than doubled since 2010 but has decreased in recent years. Studies about free-choice activities for young children held the majority of research subjects while physical subjects such as literature, class, and education plans were in the minority. Furthermore, qualitative research, fusion qualitative, and survey were the most common research types while literature review studies were less common. Most research themes were studies about contemplation, actual conditions and perception, factor analysis, and programs of free-choice activities for young children. Conclusion/Implications: Considering the results of this study, further studies on free-choice activities for young children must be conducted.

• Communications for Statistical Applications and Methods
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• 제26권1호
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• pp.27-34
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• 2019

We study the effect of detrending on the coherency between two time series processes. Many economic and financial time series variables include nonstationary components; however, we analyze the two most popular cases of stochastic and deterministic trends. We analyze the asymptotic behavior of coherency under incorrect detrending, which includes the cases of first-differencing the deterministic trend process and, conversely, the time trend removal of the unit root process. A simulation study is performed to investigate the finite sample performance of the sample coherency due to incorrect detrending. Our work is expected to draw attention to the possible distortion of coherency when the series are incorrectly detrended. Further, our results can extend to various specification of trends in aggregate time series variables.

• 기술혁신학회지
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• 제5권3호
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• pp.367-381
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• 2002

This study deals with the technological trends in the automobile recycling technologies. It first discusses the importance and current situation of automobile recycling. And then it discusses the technological trends in automobile recycling industry classifying the technologies into three groups: disassemblying, recycling, and design. It deals with recycling of major parts of automobiles and the design of automobile for recyclability. This study also contains a patent analysis of the technologies. Different patterns in the trend of patents among various conn-tries are discussed with the context of legal and industrial situation of each country And finally it discusses the forecasting for the future technological and legislative trends.

• International Journal of Contents
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• 제12권3호
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• pp.54-58
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• 2016

In this study, articles of the science and technology field that had been monitored for the period from 2002 to 2013 using GTB (Global Trends Briefing) were analyzed. Specifically, the VOSviewer was used to analyze the annual science and technology trends by keyword and the science and technology standard-classification information indicated in the GTB articles, and the convergence trends were therefore monitored. The findings of this study show that active studies were under way in the fields of material science and new and renewable energy, and that convergence has progressed. This result indicates that the information of the articles on papers and patents is more reliable, as it can reflect the current trends more rapidly in the science and technology field than the paper information or the patent information that is traditionally used in analyses of science and technology information.

• Asia Marketing Journal
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• 제18권4호
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• pp.1-26
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• 2017

This study introduces research trends in Asia by analyzing the publications of scholars in major universities in Asia, which can provide Asian researchers with what topics Asian researchers have been conducting the last six years. In addition, this study provides information on who have been active in research with the list of top one hunred scholars according to their H index scores. For this analysis, we have collected academic publications of all the professors in major universities from twelve Asian countries, analyzed what topics they have been studying along with which topics are most popular by country and geographical area, evaluated scholars' academic performances in terms of their impacts on academic society, and finally selected the top one hunred scholars among them. This study makes some unique contributions to the academic societies in Asia at least in two ways. Firstly, this study provides Asian researchers with information on what Asian researchers have been studying for the last six years, which is expected to help Asian researchers to understand research trends in Asia. Secondly, this study introduces who has been active in academic research in what countries or universities in Asia, which has never been addressed in the academic societies in Asia. This study hopefully generates some positive competition among Asian scholars and acknowledges their contribution to academic societies.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2001년도 제22회 KOSCI SYMPOSIUM 논문집
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• pp.147-155
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• 2001

The NOx emission characteristics of jet flames fueled with $H_2$ and $CH_4$ were studied. Experimental and numerical investigations were carried out for various flames with varying equivalence ratio, fuel flow rate and nozzle diameter. The Emission indices of NOx(EINOx) were measured by chemiluminescent method and calculated by simulation using detailed chemistry. The results show that EINOx of $CH_4$ and $H_2$ flames have different trends in terms of equivalence ratio and fuel flow rate but have the same trends in terms of nozzle diameter. These differences can be explained by the following Thermal and Prompt trends in both flames. Thermal EINOx trends can be describe in function of residence time in the high-temperature region weighted by the maximum flame temperature and Prompt EINOx trends can be described in function of flame surface area of each combustion conditions.

• 한국의사학회지
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• 제27권2호
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• pp.1-9
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• 2014

Objectives : Most academic societies have their own journals. Those journals represent the trends of academic societies' studies. Therefore, it is important to review articles in journals. Korean Society of Medical History (KSMH) has Journal of Korean Society of Medical History (J. of KSMH). We analyze articles in J. of KSMH and try to recognize the trends. Methods : From Vol. 12 No. 2 in 1999 to Vol. 27 No. 1 in 2014 of the J. of KSMH, we retrieved article's headings and analyzed those subjects. Results : We got 342 research articles about ; book 97, person 44, theory 65 (medical theory 48, thought 8, origin of word and story 9), clinical research 42 (disease 19, method 16, treatment 7), system of medicine and medical treatment 22 (system of medicine 10, system of medical treatment 12), mutual and comparative study in medicine 18 (mutual study 14, comparative study 4), etc. 56 (materia medica and prescription 23, trends study and essay 18, traditional medicine informatics 10, community medicine 5). Conclusions : J. of KSMH contained several subjects based on medical history ; book, person, theory, thought, origin of word and story, clinical research, mutual and comparative study in medicine, etc. However, the subjects were biased to books and persons.

• 아동학회지
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• 제31권5호
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• pp.131-149
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• 2010

The purpose of this study was to examine research trends in articles of preschooler peer relationships carried in domestic academic journals. This was done in an attempt to suggest alternative directions for peer relationship studies in the early childhood education sector and lay the foundation for future studies. 131 articles that appeared in seven domestic academic journals related to early childhood education were selected and analyzed in order to better understand the general trends in the filed and the specific trends in terms of their content and methods. Our results indicate that the observation method was most common in the quantitative studies, and participant observation was most prevailent among qualitative studies. As for instrumentation, international instruments were most widely utilized, and the most dominant analysis method was descriptive statistics. In terms of reliability, internal consistency was checked most often, however, the majority of the studies failed to provide any information on validity and post-hoc analysis.

• Communications for Statistical Applications and Methods
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• 제30권2호
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• pp.149-162
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• 2023

The ℓ₁-trend filtering method is one of the most widely used methods for extracting underlying trends from noisy observations. Contrary to the Hodrick-Prescott filtering, the ℓ₁-trend filtering gives piecewise linear trends. One of the advantages of the ℓ₁-trend filtering is that it can be used for identifying change points in piecewise linear trends. However, since the ℓ₁-trend filtering employs total variation as a penalty term, estimated piecewise linear trends tend to be biased. In this study, we demonstrate the biasedness of the ℓ₁-trend filtering in trend level estimation and propose a two-stage bias-reduction procedure. The newly suggested estimator is based on the estimated change points of the ℓ₁-trend filtering. Numerical examples illustrate that the proposed method yields less biased estimates for piecewise linear trends.

• 무역학회지
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• 제45권5호
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• pp.239-260
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• 2020

This research was conducted on 176 GVCs-related research papers listed in the Index of Korean Academic Writers. The analysis methodology used the keyword network analysis methodology of big data analysis. For the comprehensive analysis of research trends, the research trends through word frequency (TF), important topic (TF-IDF), and topical modeling were analyzed in 176 papers. In addition, the research period of GVCs was divided into the early stages of the first study (2003-2014), the second phase of the study (2015-2017), and the third phase of the study (2018-2020). According to the comprehensive analysis, the GVCs research was conducted with the keyword 'value added' as the center, focusing on the keywords of export (trade), Korea, business, influence, and production. Major research topics were 'supporting corporate cooperation and capacity building' and 'comparative advantage with added value of overseas direct investment'. According to the analysis of major period-specific research trends, GVCs were studied in the early stages of the first phase of the study with global value chain trends and corporate production strategies. In the second research propulsion period, research was done in terms of trade value added. In the recent third phase of the study, small and medium-sized enterprises actively participated in the global value chain and actively researched ways to support the government. Through this study, the importance of the global value chain has been confirmed quantitatively and qualitatively, and it is recognized as an important factor to be considered in the strategy of enhancing industrial competitiveness and entering overseas markets. In particular, small and medium-sized companies' participation in the global value chain and support measures are being presented as important research topics in the future.