• 레미콘
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• no.9 s.25
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• pp.52-62
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• 1990

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.7
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• pp.3238-3246
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• 2013

The progress of Information Technology enables people can communicate each others using the Internet. As a smartphone proliferates, many free mobile VoIP(Voice over IP) application are developed and accepted by smartphone users. In this study we investigate the factors affecting the acceptance of mobile VoIP applications and the structural relationship among these factors. We review the related works and extract the related factors and build a research model describing the causal relationship among these factors. We conduct an empirical study - a survey and statistical analysis - to verify the research model. EFA(Exploratory Factor Analysis) is applied for variables in the survey and SEM(Structural Equation Model) is used to reveal the structural relationship among the factors. We can find that two factors - usefulness of mobile VoIP and social influence - positively affect usage intention and actual use. These findings imply that it is required to emphasize the benefits of mobile VoIP use and add S/W functionalities enhancing social influence.

• Journal of the Korean Data and Information Science Society
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• v.21 no.1
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• pp.1-9
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• 2010

This paper suggests a mixed-effects model for analyzing split-plot data when there is a repeated measures factor that affects on the response variable. Covariance structures are discussed among the observations because of the assumption of a repeated measures factor as one of explanatory variables. As a plausible covariance structure, compound symmetric covariance structure is assumed for analyzing data. The restricted maximum likelihood (REML)method is used for estimating fixed effects in the model.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1999.12a
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• pp.81-99
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• 1999

인터넷 및 전자상거래의 확산과 함께 국내에서도 인터넷을 이용한 수출을 지칭하는 이른바 “인터넷 무역”내지 “전자무역”의 시대가 열리고 있다. 그러나 아직도 우리 나라의 대다수 중소기업들의 경우에는 보안, 신뢰, 인터넷관련비용, 기술, 제도적 지원의 미흡, 하부구조의 미비 등 인터넷 활용에는 많은 장애요인이 있는 것으로 알려지고 있다. 따라서 본 연구에서는 우리 나라 중소기업들이 인터넷무역을 구현하는데 영향을 미치는 주요 요인들은 무엇이며, 또 이들이 인터넷 무역을 구현하기 위해 노력하는 과정에서의 장애요인에는 어떠한 것들이 있는지, 그리고 그에 따른 성과에는 어떠한 차이가 있는가를 규명하였다. 실증분석 결과 산업의 경쟁강도와 하부구조 등 외부환경특성과 최고경영자의 태도, 전자상거래 담당인력, 수출대상국 수 등의 기업특성이 실행범위에 영향을 미치는 것으로 나타났으며, 인터넷무역의 실행범위가 넓을수록, 장애요인에 대한 인지도가 낮을수록 성과가 높은 것으로 밝혀졌다 그러나 장애요인과 실행범위에는 유의한 관계가 발견되지 않았다. 이는 기업들의 입장에서는 보다 적극적으로 인터넷을 다양한 무역범위에 활용할 필요가 있으며, 정부는 실효성있는 정책적 지원을 동해 인터넷무역의 장애요인을 완화시켜 나갈필요가 있음을 의미한다.

• The Journal of Information Systems
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• v.6 no.1
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• pp.127-142
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• 1997

본 연구의 목적은 리엔지니어링 작업 구현에 영향을 주고 있는 조직·관리적 요인 들을 실중적으로 연구하는 것이다. 본 연구에는 두 가지 목적이 있다. 첫째, 리엔지니어링 작업의 구현을 성공적으로 이끄는 조직·관리적인 요인들을 조사했다. 본 연구에서 조사되어 질 조직·관리적 요인들을 조직구조, 문화, 최고경영자의 의지, 그리고 리엔지니어링 작업의 구현을 위한 성공요인(success factors) 중에서 어느 요인이 핵심성공요인(key success factors)이지를 나타내고자 한다. 본 연구 결과에서의 성공요인으로는 자율적인 기업 문화, 회고 경영자의 의지, 그리고 관리제도상의 변화인 것으로 나타났고 특히, 자율적인 기업 문 화와 관리제도상의 변화가 핵심 성공요인인 것으로 확인되었다.

• Journal of The Korean Association For Science Education
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• v.39 no.2
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• pp.161-171
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• 2019

The purposes of this study are: 1) to verify the systems thinking factor structure of elementary school students and 2) to compare systems thinking according to their preferred subjects in order to get implications for following research. For the study, pre-tests analyze data from 732 elementary school students using the STMI (Systems Thinking Measuring Instrument) developed by Lee et al. (2013). And exploratory factor analysis was conducted to identify the factor structure of the students. Based on the results of the pre-test, the expert group council revised the STMI so that elementary school students could respond to the 5-factor structure that STMI intended. In the post-test, 503 data were analyzed by modified STMI and exploratory factor analysis was performed. The results of the study are as follows: First, in the pre-test, elementary school students responded to the STMI with a test paper consisting of two factors (personal internal factors and personal external factors). The total reliability of the instrument was .932 and the reliability of each factor was analyzed as .857 and .894. Second, for modified STMI, elementary school students responded a 4-factor instrument. Team learning, Shared Vision, and Personal Mastery were derived independent factors, and mental model and systems analysis were derived 1-factor. The total reliability of the instrument was .886 and the reliability of each factor was analyzed as .686 to .864. Finally, a comparison of systems thinking according to preferred subjects showed a significant difference between students who selected science (engineering) group and art (music and physical education). In conclusion, it was confirmed that statistically meaningful results could be obtained using STMI modified by term and sentence structure appropriate for elementary school students, and it is a necessary to study the relation of systems thinking with various student variables such as the preferred subjects.

• Informatization Policy
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• v.22 no.2
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• pp.75-92
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• 2015

The purpose of this study was to analysis about the relationship among Cyber Home Learning System(CHLS) circumstance, learner construct, learning satisfaction in elementary school students. Base on the selected data which was gathered from Chungbuk & Deajeon elementary schools, Structural Equation Modeling was used to examine the relationship between factors. The main results of the research were as follow : First, CHLS circumstance factor was more effective on the CHLS satisfaction than CHLS learner construct. In CHLS circumstance factor, 'service' factor was more influential variable. Second, there is high correlation between CHLS circumstance factor and CHLS learner construct. In CHLS satisfaction, 'contents and design' factor was more influential variable. Third, the model fit, = 624.945 (p<.001), RMR .020, GFI .929, AGFI .878, NFI .927, CFI .930, RMSEA .102 was relatively satisfied with the standard using structural equation model. As based on this results, CHLS in elementary education needs elaborate circumstance for the effective achievement.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.11a
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• pp.1371-1372
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• 2003

직물에서 구조적 요인이 쾌적성과 연관된 유체전달 특성들에 미치는 영향을 연구하였다. 고려된 구조변수는 직물을 구성하는 실의 구성성분 그리고 꼬임수이다. 측정한 쾌적성과 연관된 물성으로 수분 흡수성, 수분 증발성, 그리고 수분 투과성이다. 이들 물성은 고려된 구조 인자들에 의해 큰 영향을 받았다. 결과들에 대한 객관적 분석과 이해를 위해 실에서 접촉적각, 직물에서 모세관 흡수 곡선, 그리고 기공크기를 측정하였으며, 또한 기존 이론들을 수정한 모델을 도입하여 모사 설명하였다.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2003.08a
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• pp.307-314
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• 2003

해양콘크리트 구조물의 내구성에 가장 큰 영향은 미치는 요인 중의 하나가 염소 이온의 침투에 의한 철근부식이다. 염소이온이 콘크리트 구조물 내부로 확산되어 철근이 부식하게 되면 철근의 부피팽창으로 콘크리트 덮개에 균열이 발생하고 철근의 단면적도 줄어들게 된다. 따라서, 구조물은 사용연한을 채우지 못 하고 붕괴되거나 사용성에 큰 문제가 발생하게 된다. (중략)

• The Journal of the Korea Contents Association
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• v.13 no.11
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• pp.829-844
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• 2013

This study performed comprehensive tests on the four hypotheses on the capital structures for the firms listed in the KOSPI during the period from 2006 to 2011. It may be of concern to find any financial profiles on firms' leverage across the book- and market-value bases since there was relatively little attention drawn to any financial changing profile of the leverage surrounding the period of the pre-and the post-global financial crises. The findings of this study may also be compared with those of the previous related literature, by which it may be expected to enhance the robustness and consistency of the results across the different classifications on capital markets. It was found that three explanatory variables such as PFT, SIZE, and RISK, were found to be the statistically significant attributes on leverage during the tested period. Moreover, the outcome by the Fisher Exact test showed that a firm belonging to each corresponding industry may possess its reversion tendency towards the industry mean and median leverage ratios.