• 대한전자공학회논문지
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• 제14권2호
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• pp.28-31
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• 1977

반도체내에서의 종변조로 독한 반송파의 정상모드를 정의하였다. 충돌효과 및 열확산 현상이 있을때 이 반송파의 산란관계식을 유도하고 상세히 검토하였다. 특수한 경우에 이 반송파는 널리 알려진 공간 전하파와 전기음향파로 됨을 또한 여기에 밝혔다.

• 복식
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• 제55권2호
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• pp.105-115
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• 2005

The purposes of this study were to identify the service quality, quality of relationship, and relationship continuity intention of rental clothing store. Questionnaires developed by researcher were collected from 212 consumers who experienced rental clothing. Data was analysed by use of factor analysis, path analysis, and covariance structure analysis. The results were; 1. Factors of service quality of clothing rental store were tangibility & promotion, shop assistant & store atmosphere, customer empathy, customer reliability strategy, customer management, and customer convenience. And factors of relationship quality were satisfaction, trust, emotional involvement, and calculational involvement, and factors of relationship continuity intention were longitudinal relationship propensity & word-of-mouth and rerental intention. 2. Service quality of rental store affected significantly on relationship quality, and relationship quality affected significantly on relationship continuity intention. And service qualify of rental store affected significantly on relationship continuity intention through relationship qualify.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(II)
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• pp.170-175
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• 2003

The ASCE formula of pipeline' soil interaction force is the basis of semi-analytical relationship for buried pipelines subjected to longitudinal permanent ground deformation due to seismic induced liquefaction. However, since the ASCE formula has been developed based on the stiffness of non-liquefied region, it is needed to modify for the varied stiffness of liquefied region. With this object, the consideration of decreasing effect of soil stiffness in liquefied region is made: i.e. the spatial distributions of pipeline. soil interaction force in liquefied region. It means that the improved formula can reflect various patterns of permanent ground deformation more realistically. Through the comparative analyses using both the improved and ASCE formula, the applicability of the improved, the limitation of the existing formula and semi-analytical relationship are discussed.

• 지역사회간호학회지
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• 제31권1호
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• pp.86-95
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• 2020

Purpose: The aim of this study was to examine the correlation between school-life adjustment and suicidal ideation in adolescents by applying the latent growth curve models to the longitudinal data. Methods: This study analyzed three waves of data from the Korean Children & Youth Panel Survey (2014~2016). A total of 1,534 students were included in the analysis. In the application of the latent growth curve models to the longitudinal survey data, we analyzed the initial status and growth changes for each wave, identified individual differences in the general characteristics, and examined the direct relationship between the two latent constructs. Results: The analysis revealed that variations in the initial status and rate of school-life adjustment were significant with respect to parents' education level, household income and academic satisfaction. Variations in the initial status and growth rate of suicidal ideation were significantly associated with household income and family structure. The relationship between school-life adjustment and suicidal ideation showed a negative correlation in which the starting value of the former increased and that of the latter decreased and vice versa. Conclusion: The results confirmed that school-life adjustment and suicidal ideation varied according to students' general characteristics. In addition, school-life adjustment was negatively correlated with suicidal ideation, thereby highlighting students' ability to adjust as an important factor influencing their suicidal thinking.

• 한국보육지원학회지
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• 제12권5호
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• pp.137-155
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• 2016

The purpose of the present study was to investigate the longitudinal relationship between main caregivers' life satisfaction and depression and self-esteem of school-aged children, and to provide plans for improving the lives of the school-aged children. For this purpose, we analyzed the three years'longitudinal panel data (2011-2013) of the Korean Children and Youth Panel Survey (KCYPS) including 2,342 first grade elementary school children employing the latent growth model using SPSS 18.0 and AMOS 22.0. Analysis results were as follows. First, main caregivers'life satisfaction and school-aged children's depression increased as time passes and linear change model was selected. Second, the initial status of main caregivers'life satisfaction had effects on the initial status of their children's depression, but initial status and rates of change of life satisfaction did not have an influence on the rates of change of the depression. However, it was found that the main caregivers' life satisfaction had effects on the school-aged children's self-esteem and it worked as a mediator on the longitudinal relationship between the main caregivers'life satisfaction and the children's depression. School-aged children's self-esteem was a partial mediator on the initial status of their depression and full mediator on these rates of change. These findings suggests that programs improving school-aged children's self-esteem should be developed.

• 한국콘텐츠학회논문지
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• 제22권9호
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• pp.473-484
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• 2022

본 연구는 노년기 주관적 건강상태와 우울 간의 종단적 상호인과관계를 밝히는 데 있다. 이를 위해 전국단위의 조사자료인 고령화연구패널조사 제5차연도 자료부터, 제6차연도, 제7차연도 자료까지 추적 조사에 모두 응답한 65세 이상 3,363명을 대상으로 자기회귀교차지연모형을 검증하였다. 주요 분석결과는 다음과 같다. 첫째, 이전 시점의 주관적 건강상태는 이후 시점의 주관적 건강상태에 정(+)적으로 유의한 영향을 미쳤다. 둘째, 이전 시점의 우울은 이후 시점의 우울에 정(+)적으로 유의한 영향을 미치는 것으로 나타났다. 셋째, 조사대상 기간 동안 이전 시점의 주관적 건강상태는 이후 시점의 우울에 부(-)적으로 유의한 영향을 미치는 것으로 나타났으나, 그러나 이전 시점의 우울은 이후 시점의 주관적 건강상태에 유의미한 영향을 미치지 않았다. 연구결과에 기초해 노년기 초기 기초체력 증진을 위한 체계적인 정책의 필요성과 건강증진 프로그램의 확대 시행 및 통합적 우울 관리 프로그램 시행이 필요함을 제안하였다.

• 한국수학교육학회지시리즈A:수학교육
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• 제61권2호
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• pp.359-373
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• 2022

본 연구는 경기교육종단연구(GEPS)의 2015년(중1)부터 2017년(중3)까지의 자료를 자기회귀교차지연모형에 적용하여 학업스트레스, 수학자기효능감, 수학수업참여의 종단적 관계와 성취수준에 따른 차이를 검증하였다. 연구결과, 성취 상·하위집단 모두 학업스트레스, 수학자기효능감, 수학수업참여가 시간의 경과에 따라 안정적인 것으로 나타났다. 그리고 상위집단은 학업스트레스가 수학자기효능감을 매개하여 수학수업참여에 부적 영향을 미치는 반면, 하위집단은 학업스트레스가 수학수업참여를 매개하여 수학자기효능감에 정적인 영향을 미쳤다. 이는 학업스트레스가 학습자의 성취수준에 따라 차별적으로 작용하고 있음을 의미하는 것으로, 수학교사는 이와 같은 특성을 교수·학습전략에 반영하여 학생들의 수학자기효능감 향상 및 수학수업참여에 도움을 주어야 할 것이다.

• Asia pacific journal of information systems
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• 제18권3호
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• pp.147-165
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• 2008

IT education can be summarized as persuading the educatee to accept IT. The persuasion is made by delivering the messages for how-to-use and where-to-use to the educatee, which leads formulation of a belief structure for using IT. Therefore, message based persuasion theory, as well as IT acceptance theories such as technology acceptance model(TAM), would play a very important role for explaining IT education. According to elaboration likelihood model(ELM) that has been considered as one of the most influential persuasion theories, people change attitude or perception by two routes, central route and peripheral route. In central route, people would think critically about issue-related arguments in an informational message. In peripheral route, subjects rely on cues regarding the target behavior with less cognitive efforts. Moreover, such persuasion process is not a one-shot program but continuous repetition with feedbacks, which leads to changing a belief structure for using IT. An educatee would get more knowledge and experiences of using IT as following an education program, and be more dependent on a central route than a peripheral route. Such change would reformulate a belief structure which is different from the intial one. The objectives of this study are the following two: First, an identification of the relationship between ELM and belief structures for using IT. Especially, we analyze the effects of message interpretation through both of central and peripheral routes on perceived usefulness which is an important explaining variable in TAM and perceived use control which have perceived ease of use and perceived controllability as sub-dimensions. Second, a longitudinal analysis of the above effects. In other words, change of the relationship between interpretation of message delivered by IT education and beliefs of IT using is analyzed longitudinally. For achievement of our objectives, we suggest a research model, which is constructed as three-layered. While first layer has a dependent variable, use intention, second one has perceived usefulness and perceived use control that has two sub-concepts, perceived ease of use and perceived controllability. Finally, third one is related with two routes in ELM, source credibility and argument quality which are operationalization of peripheral route and central route respectively. By these variables, we suggest five hypotheses. In addition to relationship among variables, we suggest two additional hypotheses, moderation effects of time in the relationships between perceived usefulness and two routes. That is, source credibility's influence on perceived usefulness is decreased as time flows, and argument quality's influence is increased. For validation of it, our research model is tested empirically. With measurements which have been validated in the other studies, we survey students in an Excel class two times for longitudinal analysis. Data Analysis is done by partial least square(PLS), which is known as an appropriate approach for multi-group comparison analysis with a small sized sample as like this study. In result. all hypotheses are statistically supported. One of theoretical contributions in this study is an analysis of IT education based on ELM and TAM which are considered as important theories in psychology and IS theories respectively. A longitudinal analysis by comparison between two surveys based on PLS is also considered as a methodological contribution. In practice, finding the importance of peripheral route in early stage of IT education should be notable.

• 한국심리학회지 : 문화 및 사회문제
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• 제22권4호
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• pp.567-593
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• 2016

본 연구에서는 낙인이론과 여러 선행연구들을 기반으로 하여 청소년을 대상으로 부모의 욕설 및 폭력 등의 피학대경험이 학업성취도에 미치는 영향을 비공식낙인이 매개하는지 종단적으로 검증하고자 하였다. 비공식낙인의 종단적 매개효과를 검증하기 위해 한국청소년패널 조사 중2 패널 2차년도~4차년도 데이터(N=3,168)를 활용하여 자기회귀교차지연모델(ARCL)로 분석을 진행하였고, 연구결과는 다음과 같다. 첫째, 청소년의 피학대경험은 비공식낙인에 종단적으로 정적인 영향을 나타내었다. 둘째, 청소년의 비공식낙인은 학업성취에 종단적으로 부적인 영향을 나타내었다. 셋째, 청소년의 피학대경험은 학업성취에 종단적으로 부적인 영향을 나타냈고, 이 경로를 비공식낙인이 부분 매개하였다. 이와 같은 결과를 바탕으로 본 연구에서는 아동학대 예방의 방향성과 비공식낙인에 대한 예방 및 교육의 필요성을 제시하였다. 또한 비공식낙인을 받은 청소년들을 대상으로 대처 프로그램을 개발한다고 했을 때의 방향성에 대해서도 고찰하였다. 본 연구는 낙인이론을 검증한 경험적 뒷받침이 됨과 동시에 피학대경험과 비공식낙인의 지속적인 영향력에 대한 사회적 관심을 촉구하고 이를 예방하기 위한 노력을 가속화 할 수 있게끔 도움을 줄 것이라 기대된다.

• Asia pacific journal of information systems
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• 제15권2호
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• pp.121-148
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• 2005

This study focuses on MRO e-Marketplace and attempts to research how companies select the structure of e-Marketplace governance and how it influences purchasing performance. Furthermore, a longitudinal study is conducted to analyze the dynamic relationship between variables in our research model. The research gives the following results. First, as the utilization level of e-Marketplace increases, the level of relational exchange between purchasing company and e-Marketplace increases. The increased utilization level enhances purchasing efficiency rather than reducing purchasing price. Secondly, as the level of relational exchange between purchasing companies and e-Marketplace increases, system integration increases, whereas supply externality decreases. Accordingly, system integration improves purchasing efficiency, whereas the low supply externality does not help lower purchasing price. Third, compared to the initial growth stage, the stable stage of e-Marketplace has the significantly increased level of relational exchange and purchasing efficiency through system integration, rather than the reduction of purchasing price by supply externality.