• Proceedings of the Safety Management and Science Conference
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• 2005.05a
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• pp.325-337
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• 2005

기존의 논문들은 단순히 기업가치(firm value)가 부채(debt)에 의한 요인들(determinants)에 의하여 좌우된다고 보았으며, 기업의 소유구조(managerial ownership)와 기업가치는 별개(exogenous)로 간주하여 왔다. 이 번 논문에서는 기업 가치를 좌우하는 요인들에 부채 이외에 기업의 소유구조를 내생변수(joint endogenous)로 추정하고, 통계방법으로는 수단변수를 사용하여 GMM(generalized method of moments)를 통하여 추정하기로 한다. 이 연구를 통해서는 부채와 기업 소유구조 사이에 밀접한 상호작용(interrelated)이 있음을 발견하였다. 부채와 기업의 소유구조를 내생화시킴으로써 이번 연구에서는 부채가 기업가치에 약한 부정적인(-) 영향을 주는 것으로 나타났으나, 기업의 소유구조는 기업 가치에 강한 긍정적 요인으로 작용하고 있음을 알 수 있었다. 이와 같이 부채와 기업가치의 약한 부정적인 관계에 대한 선행연구로는 Shea(1997)과 Hahn and Hausman(1999)이 있다. 또한, 기업가치는 시장점유율(market power)과 주가(treasury stock)와 양(+)의 관계에 있음을 알 수 있었다.

• The Korean Journal of Applied Statistics
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• v.24 no.5
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• pp.799-807
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• 2011

This study investigates long and short run responses of variables to exogenous shocks by imposing prior restrictions on a contemporaneous structural shock coefficient matrix of the model to identify shocks by endogenous variables in the vector autoregression. The relative importance of each structural shock in variation of each variable is calculated through the identification of proper restrictions (not based on any specific theory but on researcher judgment corresponding to actual situations) and an estimation of the structural vector autoregression. The results of the analyses are found to maintain consistency.

• International Area Studies Review
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• v.12 no.3
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• pp.153-169
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• 2008

This paper examines the recently empirical test for the two types of endogenous growth models, which one is more fitted to real data. We adopt the non-stationary panel data methodologies for seeking empirical implication by using productivity and R&D data in the OECD over the past two decades. The Empirical tests show that there is a robust relationship Total Factor Productivity and R&D variables implied by semi-endogenous growth model. The relationship suggested by fully endogenous growth theory, however, is sensitive to R&D variables. Therefore, the estimation results provide empirical evidence in favour of endogenous growth theory of R&D expenditure role for sustaining economic growth. The sustained Total Factor Productivity, however, is maintained by more increasing R&D inputs for overcoming diminishing return to R&D efforts.

• Korean Journal of Social Welfare Studies
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• v.40 no.3
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• pp.125-148
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• 2009

This study suggests hypothetic models and tests about the mediating effect of volunteer motivation which effects on the personal characteristic of hospice volunteer the participation level of volunteer activities and durability. Also, this study suggest a theoretical base for the seeking of hospice volunteer participation revitalization. This research participated 200 volunteers who attended the Autumn Conference in 2007 and 132 volunteers from five hospice organizations. The summary of research results is that the volunteer motivation of self-protection, career, social, understanding and value are endogenous variable and the 8 paths of Agreeable${\rightarrow}$self-protection, Agreeable${\rightarrow}$career, Neuroticism${\rightarrow}$career, Agreeable${\rightarrow}$social, Agreeable${\rightarrow}$understanding, Agreeable${\rightarrow}$value, Neuroticism${\rightarrow}$value, Extroversion${\rightarrow}$value valid. The path of social motivation${\rightarrow}$the participation level of volunteer activities, understanding motivation ${\rightarrow}$ the participation level of volunteer activities, value motivation${\rightarrow}$the participation level of volunteer activities are valid in the participation level of volunteer activities as an endogenous variable. The path of understanding motivation ${\rightarrow}$ the durability level of volunteer activities, value motivation ${\rightarrow}$ the durability level of volunteer activities, the participation level of volunteer activities ${\rightarrow}$ the durability level of volunteer activities are valid in the durability level of volunteer activities as an endogenous variable. Also, this study test the mediating effect an attended direct effect as the central figure and based on the these results, the revitalizations of hospice volunteer participant are suggested as an proposal.

• Korean Journal of Social Welfare Studies
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• v.41 no.4
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• pp.247-276
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• 2010

This study aimed to examine the model to explain the mediator effect of care evaluation(care stress, care satisfaction) on the effect of stress factors and resource on the psychological well-being of the parents of the adult intellectual disabilities. Examining whether there is a difference between the gender of parents was another aim of this study. Study results showed that with the care stress as an endogenous variable, the daily life function and maladjustment behavior of adult children and the health state of parents had a significant direct effect on the psychological well-being of parents. With care satisfaction as an endogenous variable, family support, expert support and care stress had a significant direct effect. With the psychological well-being as an endogenous variable, care satisfaction and care stress had a significant effect, but the health state of parents didn't. In case of indirect effect, the care stress had a significant mediator effect on the effect of the physical function and maladjustment behavior of adult children and the health state of parents on the psychological well-being of parents. Care satisfaction had a significant mediator effect on the effect of family support, expert support and care stress on the psychological well-being of parents. According to the result of the Multiple Group Analysis, the path showed a statistically significant difference between gender was friend support→care satisfaction, care stress→psychological wellbeing, expert support→care satisfaction. On the basis of the study results, practical suggestions were made.

• Environmental and Resource Economics Review
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• v.15 no.5
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• pp.885-919
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• 2006

This paper revisits two conventional beliefs of environmental nonmarket valuation and examines their weaknesses and a new opportunity. The two beliefs are that willingness to pay (WTP) is an appropriate measure of nonmarket behaviour and that exogenous variables are relevant predictors of WTP whilst endogenous variables are not. The contemporary literature in psychology and economics is reviewed to demonstrate departures from these two beliefs. Tackling heterogeneity in stated preferences, both socio-demographic and psychological variables should be measured simultaneously to explain and predict choice behaviours more accurately.

• Journal of Labour Economics
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• v.44 no.2
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• pp.33-69
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• 2021

This study estimates the employment relationship of domestic and foreign workers by establishing 16 municipal and provincial panel data for the period 2010-2018. It attempts to analyze industry-specific (manufacturing and construction), scale-specific (5-29, 5-29, 5-299 and 5 above) and uses the foreign worker's national share (foreigner's concentration index) as an instrumental variable to control the endogeneity of foreign workers. Finally, it compares the results of panel GLS, which does not consider the endogeneity of foreign workers, with the results using instrumental variable method that considers it. As a result of the analysis, the complementary relationship between domestic and foreign workers was confirmed in the panel GLS analysis. However, although the employment relationship between domestic and foreign workers was not statistically significant in the instrumental variable method, the analysis of the combination of manufacturing and construction industry showed a statistically significant substitute relationship. This study is highly regarded for the first time in Korea that an instrumental variable method was created to identify and control the endogeneity of foreign workers in estimating employment relationships between domestic and foreign workers.

• Journal of Venture Innovation
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• v.1 no.2
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• pp.109-121
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• 2018

New technology had been introduced continually and in many cases, we approached technology persepectives when the new technology were introduced. It was very important that researching users acceptance of the new technology in the areas of marketing and strategy. Regarding to user accepatance of new technology, many research models had been exited. This study compared with 2 models which were proposed by Venkatesh et al. named UTAUT1, UTAUT2 based on the criteria which composed of application context, variables of model, the impacts of variables. The dominant matric which was applied in all functions and industries was not exited. For the purpose of improving predictability, single or compound matrics were useful according to industries and usage

• Proceedings of The Korean Society of Health Promotion Conference
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• 2010.05a
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• pp.148-148
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• 2010

본 연구는 서울시 지역주민을 대상으로 스트레스, 우울, 문제음주 간의 인과관계를 검증하고자 시도되었다. 본 연구는 서울시 S구이며, 전체 17개동에서 만 19세 이상인 남녀 주민을 층화집락추출법을 통해 표집된 1234명을 대상으로 하는 면접식 단면조사연구를 수행하였다. 구조방정식 모형을 사용하였으며, 측정모형에서 우울, 알코올장애의 내생잠재변수와 외생잠재변수인 스트레스 및 인구학적 변수(성, 연령, 결혼상태)를 이론변수로 설정하여 이들 간의 상관관계를 추정하였다. 또한 문제음주를 최종내생변인으로 우울을 매개변인으로 설정한 상태에서 경로분석을 실시하여 각 변인들의 상대적 중요성에 대한 평가를 시도하였다. 문제음주에 영향을 미치는 변수는 여성보다는 남성이($\beta=-6.64$, p < .001), 연령이 낮을수록($\beta=-.08$, p < .001), 스트레스가 높을수록($\beta=-.08$, p < .001), 미혼이 기혼($\beta=-1.15$, p < .05)의 순으로 경로계수가 유의하였다. 우울에 미치는 영향력은 스트레스($\beta=-.56$, p < .001)와 문제음주정도($\beta=-.15$, p < .001)의 순으로 경로계수가 유의하였다. 이상과 같이 우울이 직접적으로 문제음주에 영향을 주기보다는 스트레스로 인하여 문제음주가 유발될 수 있고 문제음주를 경유하여 우울에 영향을 미치는 것으로 드러났다. 이상의 연구결과를 종합해 볼 때 문제음주는 스트레스와 우울과 관련성이 크므로 우선적으로 스트레스를 적극적으로 관리하는 것이 중요하다. 또한 알코올과 관련한 통제정책으로 절대적인 음주량을 감소시키는 것이 필요하며, 문제음주자를 조기 발견하여 정신건강에 문제로 발전하지 않도록 하는 예방프로그램의 개발이 시급하다 하겠다.

• The Korean Journal of Applied Statistics
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• v.28 no.1
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• pp.61-74
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• 2015

Structural equation modeling (SEM) is a widely used in social sciences such as education, business administration, and psychology. In SEM, the latent variable score is the estimate of the latent variable which cannot be observed directly. This study uses stagewise structural equation modeling(stagewise SEM; SSEM) by partitioning the whole model into several stages. The traditional estimation method minimizes the discrepancy function using the variance-covariance of all observed variables. This method can lead to inappropriate situations where exogenous latent variables may be affected by endogenous latent variables. The SSEM approach can avoid such situations and reduce the complexity of the whole SEM in estimating parameters.