• 응용통계연구
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• 제28권1호
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• pp.61-74
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• 2015

최근 교육학, 경영학, 심리학 등 사회과학 뿐만 아니라 공정관리, 생물정보학 등 자연과학에서도 널리 사용되고 있는 구조식 모형(structural equation modeling)에서 잠재변수점수(latent variable score)는 직접 측정이 불가능한 잠재변수를 수량화한 추정치이다. 이 연구에서는 구조식 모형을 단계(stage)별로 분할하여 분석하는 단계별 구조식 모형(stagewise SEM; SSEM)을 제안하였다. 기존 방법은 모든 관측변수의 분산-공분산을 한꺼번에 고려하므로 독립변수인 외생잠재변수(exogenous latent variable)가 종속변수인 내생잠재변수(endogenous latent variable)에 의해 영향을 받는, 논리적으로 타당하지 않은 경우가 있다. 단계별 구조식 모형은 이런 문제점을 해결할 뿐만 아니라 모형의 복잡성을 낮추어 쉽게 해를 찾을 수 있으며, 분석과정에서 생성되는 잠재변수점수로 추가 분석도 용이하다.

• 대한영양사협회학술지
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• 제25권2호
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• pp.142-155
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• 2019

The aim of this study was to construct and test a structural equation model for the risk factors of metabolic syndrome in Korean adults. The structural equation model hypothesizes that eating alone and feeling depressed is a risk factor for metabolic syndrome. The data of this study were obtained from the Sixth Korea National Health and Nutrition Examination Survey which was cross-sectional data from the representative national survey. A total of 4,013 subjects replied to the survey item of lifestyle and completed the physical examinations among adults aged 19 years or older in South Korea was in 2015. The structural model in this study was composed of four latent variables: eating alone, depression, negative health behavior, and metabolic syndrome. Two variables, the rate of eating alone and depression, were exogenous variables. Negative health behavior was both a mediating variable and endogenous variable, and metabolic syndrome was the final endogenous variable. The data were analyzed using the Maximum Likelihood method and bootstrapping. The structural model was appropriate for the data based on the model fit indices. The results of this study can be summarized as follows: Eating alone is a direct risk factor of metabolic syndrome in Korean women. Depression can mediate metabolic syndrome through negative health behaviors. Negative health behavior had a direct impact on metabolic syndrome in both men and women. This study may be a guideline for interventions and strategies to reduce the incidence of metabolic syndrome in Korean adults.

• 대한안전경영과학회지
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• 제15권4호
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• pp.81-88
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• 2013

In Korean society, the theme of human errors in railway has been emerging as a critical issue. As far as human error studies are concerned, main trend has been inclined to be led by industrial engineering and systems science. Apart from those trends, this study empirically highlighted the relationship between depression, which has been a frequent research subject in the medical science and psychology, and accidents, with setting depression as an exogenous variable and cognitive failure and mistake as endogenous variables, respectively. Results of hypotheses test for the 204 respondents showed that driver's depression has a significant effect on accidents mediated by cognitive failure and mistake. This findings suggest the need for exploring the diverse latent factors causing human errors and for understanding the complex cognitive process as well as for establishing integrative countermeasures to mitigate human errors.

• 한국조경학회지
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• 제38권5_2호
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• pp.151-162
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• 2010

This research aimed at measuring Park and Green Satisfaction (PGS) using subjective indicators of 'surface, line and spot' green evaluated by citizens. Also frequency of visits to park and green measured using objective indicators (number of visits) to find the relationship with PGS. A conceptual model of PGS was developed to relate evaluation to satisfaction and finally to utilization of open spaces. A sample of 500 questionnaire survey was employed for Uijeongbu City in Korea. A Structual Equation Modeling (AMOS) techniques was used to test the hypothesized relationship among factors (construct). As a result, first, PGS was explained by three latent factors of 'urban park' (${\gamma}=0.54$), 'linear facilities' (${\gamma}=0.25$), and 'surface green' (${\gamma}=0.15$) respectively. These three exogenous construct was found very useful classification system for open spaces of cities. Second, PGS (${\gamma}=0.34$) was found as a mediating variable to utilization of open spaces and also PGS was closely related to citizens Environmental Quality Satisfaction (EQS), such concept as, 'livability' and 'aesthetic quality'. The more satisfied with park and green the more people use the space. The PGS was an important QOL indicator together with the subjective indicator of 'livability'. Third, jogging and walking trails and bike ways along the river corridor was the most important green facilities contribute to the PGS and EQS. The near the distance (within 500m) the more number of visit to river corridor (green way). The river corridor promote accessibility to nature and other parks.

• 한국과학교육학회지
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• 제43권4호
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• pp.389-402
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• 2023

이 연구에서는 초등학교 과학 수업에서 교사의 PCK, 그릿, 교수 효능감 사이의 구조적 관계를 확인하고자 하였다. 문헌 분석 결과에 기초하여 PCK를 수업 지식 영역과 수업 실행 영역으로 구분하고, 이들 두 가지 영역을 외생잠재변수로 설정하여 PCK와 교수 효능감 사이의 구조적 연관성을 확인하였다. 또한, 구조방정식 모형에 교사의 그릿을 외생잠재변수로 추가하여 수업 지식, 수업 실행, 그릿이 교수 효능감에 미치는 영향을 조사하였다. PCK와 교수 효능감 사이의 구조적 관계를 확인한 결과, 수업 지식과 수업 실행 사이에 높은 상관관계가 나타났으며, 수업 지식은 수업 실행과 비교하여 교수 효능감에 더 큰 영향을 미치고 있었다. PCK, 그릿, 교수 효능감 사이의 구조적 관계를 확인한 결과, 수업 지식과 그릿은 모두 교수 효능감에 통계적으로 유의한 영향을 미치고 있지만, 수업 실행과 교수 효능감 사이의 관계는 통계적으로 유의하지 않은 것으로 나타났다. 이러한 연구 결과를 토대로 초등학교 과학 수업에서 교사 전문성과 교수 효능감을 강화하는 방안과 교사 전문성 영역에서 그릿이 갖는 의미에 대해 논의하였다.