• 척추신경추나의학회지
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• 제8권2호
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• pp.39-46
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• 2013

Objectives : To identify the association between cross-sectional area of lumbar regional muscle and stability(ST), center of pressure(COP) assessed by tetrax. Methods : Patients(n=55) who had taken L-SPINE MRI and Tetrax(Sunlight, Israel) were analyzed retrospectively. To evaluate the cross-sectional area of lumbar regional muscle, L-SPINE MRI was used. Data of ST, COP were accumulated by using dynamic equilibrium analysis by Tetrax. Of the lumbar regional muscles, the Psoas muscles and the Paraspinalis muscles were examined. Using Pearson correlation, we analyzed COP, ST and the difference between the cross-sectional area of lumbar regional muscles. Results : The variance of cross-sectional area of both sides of Psoas muscle and COP had moderate positive correlation(r=0.621). Between variance of cross-sectional area of both sides of Paraspinalis and lumbar regional muscle and COP there was low positive correlation(r=0.287, r=0.329) ST also had low correlation with variance of cross-sectional area of both sides of Psoas muscle. Conclusion : The variance of cross-sectional area between both sides of Psoas muscle had moderate correlation with COP.

• 아태비즈니스연구
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• 제15권1호
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• pp.335-352
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• 2024

Purpose - Low fertility rate is a serious problem, and this study analyzes factors affecting total fertility rate using panel data from 16 metropolitan cities and provinces in Korea from 2000 to 2022. Design/methodology/approach - Estimating the SAR model considering the weak cross-sectional dependence that exists in variables related to the regional total fertility rate, and using the DKSE estimation method considering the strong cross-sectional dependence. Findings - Estimation results considering weak and strong cross-sectional dependence were similar, confirming the robustness of the results. Female labor force participation rate has a positive effect on total fertility rate, and employment rate has no effect. However, the interaction term is a negative (-) sign. Crude marriage rate has a positive effect on total fertility rate, and apartment price has a slightly positive effect. Environmental factor has no effect, and policy factor has a negative effect. Research implications or Originality - In order for an increase in the female labor force participation rate to lead to an increase in the total fertility rate, qualitative improvements in female employment must be made. Financial investment policies for childbirth must increase their effectiveness. The problem of low fertility rate requires not only population policy but also social, economic, cultural, environmental, and policy conditions to be considered.

• 아태비즈니스연구
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• 제11권4호
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• pp.243-254
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• 2020

Purpose - This paper explores whether overnight returns measured from the last closing price to today's opening price explain the cross-section of stock returns. Design/methodology/approach - This study is conducted using the Korean stock market data from 1998 to 2018, obtained from DataGuide database. The analysis begins with portfolio-level tests, followed by firm-level cross-sectional regressions. Findings - First, when decile portfolios sorted on the daily average of overnight returns in the previous months, the highest decile portfolio exhibits a significant negative risk-adjusted return. This suggests that stocks with higher average overnight returns are temporarily overvalued due to buying pressure from investors. Second, at least 6 months of persistence exists in average overnight returns, which is in line with the results reported by Barber, Odean and Zhu (2009) that investor sentiment persists over several weeks. Finally, Fama-MacBeth cross-sectional regression of expected returns after controlling for a variety of firm characteristic variables such as firm size, book-to-market ratio, market beta, momentum, liquidity, short-term reversal, the slope coefficient for overnight returns remains negative and statistically significant. Research implications or Originality - Overall, the evidence consistently suggests that overnight return is considered as a new priced factor in the cross-section of expected returns. The findings of this paper not only adds to finance literature, but also could be useful to practitioners in making stock investment decision.

• 한국가정과학회지
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• 제2권1호
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• pp.110-113
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• 1999

Clothing shape is principally described in seven factors that are composed of clothing design, clothing material, clothing size, pattern design, sewing method and body motion etc. The aims of this study was to measurement out-line space-shape variation of clothing fitness with body by using the image processing. The subjects for direct anthropometric measurements were 248 female college students aged from 19 to 22. The data were statistically analyzed by principal analysis and cluster analysis. The results selected one somatotype. for the out-line space-shape variation of clothing fitness with body, there dimensional clothing shapes measured. and cross-sectional clothing shape obtained by the measurement was considered to be space wave form. The out-line space-shape variation of clothing fitness with body was observed between the node number and amplitudes of clothing wave form, and node number was determined at the maxim of space-shape amplitude, and the space-shape amplitudes have related with aspect ratio of cross-sectional shape. (Korean J of Human Ecology 2(1) :110-113, 1999)

• 한국의류학회지
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• 제30권11호
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• pp.1598-1607
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• 2006

The purpose of this study was to analyze the proportion of gathered skirts using a three-dimensional measurement system. And in this experiment, we have attempted to accumulate three-dimensional data of wearing model and find out adequate methods for analyzing shape of clothes. The experimental design consists of two factorial designs. We established three different kinds of fabrics, ratio of gathers. The measurement tool for three-dimensional model was whole body 3D scanner(Exima-WBS2H). Analysis program used in experiment is RapidForm 2004 PP1 and Pattern Design 2000. Data analysis utilizes SPSS WIN 10.0 Package. As the results show, there were different effect of gather and proportion of shapes among the measurements of width, thickness and areas made by different lines of vision in cross-sectional silhouette. And there were difference shapes of section area at each part of gathered skirts between vertical-outline silhouette and vortical-plane silhouette made by gathering conditions. And also the cross-sectional silhouettes and vertical silhouettes were related to shape of clothes.

• 수산경영론집
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• 제26권1호
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• pp.1-8
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• 1995

This paper tries to estimate price and quality effects in US cross - sectional fisheries demand analysis using 1987-88 Nationwide Food Consumption Survey Data. The estimated results support to the hypothesis of quality effects in cross - sectional prices, which had been already proven by Cox and Wohlgenant(1986). But Since all zero observations for the respective incomes, expenditures and quantities are eliminated for the ease of computation, it may yield inconsistent estimates from selectivity bias.

• 한국수학교육학회지시리즈A:수학교육
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• 제42권2호
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• pp.111-119
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• 2003

This research discussed a general concept on the qualitative research methods in mathematics education. It provided a classification of research methods in mathematics education. It also described research trends in mathematics education. It addressed how research design facilitates formulating a research problem, selecting a research design, choosing who and what to study, deciding how to approach Participants, selecting means to collect data choosing how to analyzing data, and interpreting data and applying the analysis. This study addressed the issues involved in choosing relevant populations and in selecting and sampling qualitative data. It described how populations are conceptualized and distinguished between probability sampling and criterion based selection. It discussed not only data arrangement such as, cross-sectional and categorical indexing, non-cross- sectional data organization, but also diagram flow chart matrix, cognitive map, family tree to facilitate analyzing data.

• 한국측량학회지
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• 제28권3호
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• pp.347-352
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• 2010

하천 구조물의 안전이나 고유기능에 미치는 영향을 파악하기 위해 하상변동 조사가 수행되고 있는데 농어촌에 산재하는 자연형 소하천의 경우 조사구간에 대한 기준이 명확하지 않다. 본 연구에서는 자연형 소하천정비 시범사업을 통해 하상단면이 정비되고 이후이 변동특성을 파악할 수 있는 구간을 대상으로 세굴과 퇴적특성을 분석하고 변량분석(ANOVA)을 통하여 평균길이별 세굴 및 퇴적량의 변화가 유의한 차이가 있는가를 판단하며 조사간격에 따른 표준편차 변화율을 바탕으로 적정한 종단측점 간격을 제시하고자 하였다. 단면조사자료의 기술분석 결과 평균조사간격은 14.91m(min: 7.0m, max: 39m)였고, 평균 단면 변동량은 공사시행 1차년도인 2004년도, 공사시행 2차년도인 2005년도에 각각 $0.82m^2$(min: $-3.80m^2$, max: $8.11m^2$)와 $0.24m^2$ (min: $-5.25m^2$, max: $8.55m^2$)였다. 단면 변동량과 단면간 길이를 바탕으로 계산된 침퇴적량을 바탕으로 집단간 차이를 알아보기 위한 동질성 검정을 실시한 결과 15m, 30m, 45m, 60m에서 유사하였으나 75m와 90m에서는 다른 집단 특성을 나타내었다. 하상변동 조사 측점간 거리가 짧으면 경제적인 비용이 증가하고 측점 간의 거리가 길으면 하천변동특성을 제대로 반영할 수 없게 되므로 평균조사길이별 산정된 침퇴적량의 표준편차를 도시한 결과를 바탕으로 본 연구에서는 자연형 소하천의 단면조사 길이를 50m로 제안하였다.

• 대한의용생체공학회:의공학회지
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• 제16권2호
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• pp.149-156
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• 1995

동맥전단부를 연구할수있는 새로운 실험방법과 기계역학적 분석방법을 제시하였다. 지금까지동맥역학적 연구는 대부분이 동맥의 길이방향과 원주방향에 대한것이 이였다. 두께방향의 변형은 포아손비라든지 비압축성가정으로 이론적으로 결정되었다. 또한 두께에 걸친 변형의 변화도 무시되었다. 그러나 병리학적인 의미에서 동맥의 두께에 걸친 변형도와 변형의 분포는 중요한 의미를 가진다. 그러므로 본연구에서 제안된 실험방법과 장치는 두께전반에 걸친 변형을 측정할수 있게 했다. 또한 전단부의 부위별 변형도의 관찰이 가능하고 병리적인 동맥경화증에 대한 현상과 역학적현상을 상관시킬 수 있음에 중요한 의미를 들 수 있다.

• 기술혁신연구
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• 제23권2호
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• pp.33-54
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• 2015

국가차원의 슈퍼컴퓨팅 성능수요 예측은 슈퍼컴퓨터를 활용하는 계산과학분야의 연구자나 연구개발 인프라를 구축 운영하고 있는 전문기관, 과학기술 인프라구축을 주도할 정부기관에 있어서 매우 중요한 정보이다. 본 연구는 그동안 진행되었던 슈퍼컴퓨터 성능관련 예측활동 분석을 통해 과학기술 역량에 영향을 미치는 요인들을 도출하고 이를 슈퍼컴퓨터 기술진보 추세에 적용한 복합 예측모형을 제안하였다. 횡단면분석에서는 슈퍼컴퓨팅 성능에 영향을 미칠 것으로 판단되는 GDP, GERD, 연구원수, SCI논문수를 고려한 다중회귀분석을 수행하였다. 그리고 횡단면분석 결과에 Top500 자료의 성능(Rmax)값을 이용한 시계열분석을 통해 도출된 기간별 기술진보율을 곱하여 슈퍼컴퓨터의 성능을 예측하였다. 제안된 예측모형을 바탕으로 세계 슈퍼컴퓨터 500위의 시계열자료를 이용하여 한국이 2016년에 보유해야 할 슈퍼컴퓨터 성능규모를 예측하였다. 횡단면분석과 기술진보율을 적용하여 2016년 한국의 슈퍼컴퓨팅 성능수요를 예측해본 결과 현재의 추세를 이용할 경우 15~30PF 정도, 목표 국가수준의 추세를 이용할 때 20~40PF 정도의 컴퓨팅 역량이 필요할 것으로 예측되었다. 이 결과는 단순 회귀분석을 적용한 결과인 9.6PF와 횡단면분석을 적용한 결과인 2.5PF와 큰 차이를 나타내었다.