• 한국농공학회지
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• 제44권3호
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• pp.73-84
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• 2002

Nominal shear strength of concrete beam is the combined strength of concrete shear strength and steel shear strength in current design code. But Torsional moment strength of concrete is neglected in calculation of the nominal torsional moment strength of reinforced concrete beam in current revised code. Tensile stress of concrete strut between cracks is still in effect due to tension stiffening effect. But the tensile stresses of concrete after cracking are neglected in bending and torsion in design. The torsional behavior is similar to the shear behavior in mechanics. Therefore the torsional moment strength of concrete should be concluded to the nominal torsional moment strength of reinforced concrete beam. To verify the validity of the proposed model, the nominal torsional moment strengths according to CEB, two ACI codes(89, 99) and proposed model are compared to experimental torsional strengths of 55 test specimens found in literature. The nominal torsional moment strengths by the proposed model show the best results.

• 한국비블리아학회지
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• 제20권2호
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• pp.31-44
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• 2009

이 연구는 전자자원 선정에 있어서 컨스펙터스의 적용가능성을 가늠하고자 한 연구이다. 컨스펙터스는 원래 단위 도서관에 있어서 주제분야별 자료 수집의 수준을 규정하기 위한 도구이지만 기존 인쇄기반 자료의 평가에 초점이 맞추어져 있다. 따라서 전자자원이 급속히 증가하면서 발생하는 한계점들이 지적되고 있기도 하다. 이에 따라 전자자원의 선정에 있어서도 적용 가능한 수정된 컨스펙터스 모형을 제시하고자 하는 것이 이 연구의 목적이다. 이를 위하여 우선 컨스펙터스의 발전과정을 개괄하고 물리적 장서개발에 있어서 컨스펙터스의 중요성을 일별하였다. 이어서 전자자원의 속성을 고려하여 컨스펙터스를 수정, 제안한 연구들에서 제시한 모형들의 주요 특성을 조사한 후 주요 논점들을 종합하여 전자자원의 선정에 참고할 수 있는 컨스펙터스 모형을 제안하였다.

• Asia pacific journal of information systems
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• 제14권1호
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• pp.165-184
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• 2004

This paper focused on developing and empirically testing an EAM(Electronic-Store Acceptance Model), By basing upon Davis' TAM(Technology Acceptance Model) and reflecting the characteristics of EC(Electronic Commerce), the EAM was proposed. This EAM could be regarded as a revised and extended TAM in the EC area. The theoretical rationale of this model was as following: 1) Though Davis' TAM was proposed a powerful tool to explain and predict usage of Information Technology, nowadays, TAM variables(perceived usefulness and ease of use) are posited as key drivers of e-commerce acceptance. 2) In the e-commerce and e-business studies, trust has been emerging as a potentially important antecedent of IT adoption. A famous internet book store was chosen to empirically test the EAM. In order to evaluate reliability and validity of instrument, and validate the research model, SEM(Structured equation model) analysis was conducted. The results showed that perceived usefulness and trust significantly influenced e-Store Acceptance but perceived ease of use did not have significant influence on e-Store Acceptance.

• 대한간호학회지
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• 제32권1호
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• pp.77-88
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• 2002

The purpose of this study was designed to develope and test the structural model that explains alcohol consumption behaviors among university students in Republic of Korea. The hypothetical model was constructed on the basis of the literature review and Pender's Health promotion model. Data was collected from questionnaires from 512 university students in Republic of Korea, from August to September, 2000. The reliability of instruments was adequate (Cronbach's alpha= .69-.90). Data analysis was done with SAS 6.12 for descriptive statistics and LISREL 8.13 program for covariance structural analysis. The results are as follows; 1. The overall fit of the hypothetical model to the data was moderate. Thus it was modified by male and female models. 2. The revised model has become parsimonious and had a better fit to the empirical data (male: χ2=87.21 p=.00, GFI=.97, AGFI= .94, NFI=.99, NNFI=1.0, CN=619.17, female: χ2=49.29 p=.31, GFI=.45, AGFI= .95, NFI=.99, NNFI=1.0, CN=370.02). 3. Self-efficacy was most significant factor and personality of novelty seeking, reward compensation, alcohol expectancy and drinking attitude have significant effects on male alcohol consumption behavior. 4. Personality of novelty seeking was most significant factor and personality of harm avoidance, friend influence, self-efficacies, alcohol expectancy and drinking attitude have significant effects on female alcohol consumption behavior.

• Earthquakes and Structures
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• 제8권4호
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• pp.843-857
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• 2015

System identification is regarded as the most basic technique for structural health monitoring to evaluate structural integrity. Although many system identification techniques extracting mode information (e.g., mode frequency and mode shape) have been proposed so far, it is also desired to identify physical parameters (e.g., stiffness and damping). As for high-rise buildings subjected to long-period ground motions, system identification for evaluating only the shear stiffness based on a shear model does not seem to be an appropriate solution to the system identification problem due to the influence of overall bending response. In this paper, a system identification algorithm using a shear-bending model developed in the previous paper is revised to identify both shear and bending stiffnesses. In this algorithm, an ARX (Auto-Regressive eXogenous) model corresponding to the transfer function for interstory accelerations is applied for identifying physical parameters. For the experimental verification of the proposed system identification framework, vibration tests for a 3-story steel mini-structure are conducted. The test structure is specifically designed to measure horizontal accelerations including both shear and bending responses. In order to obtain reliable results, system identification theories for two different inputs are investigated; (a) base input motion by a modal shaker, (b) unknown forced input on the top floor.

• Communications for Statistical Applications and Methods
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• 제17권1호
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• pp.107-115
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• 2010

제제간의 생물학적 동등성을 입증하는데 실패했을 때 추가시험을 허용하는 새로운 생물학적 동등성 시험 기준이 2008년 7월부터 시행하게 되었다. 추가시험의 의미나 시험 기준에서 제시하는 절차를 살펴보고 추가시험의 통계학적 의미를 고찰한다. 또한 사례를 통해 추가시험을 고려할 경우 어떤 점에 유의하여야 성공 할 수 있을 것인가 논의한다.

• 아동학회지
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• 제27권5호
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• pp.49-65
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• 2006

This attitudes scale for prediction of mathematics achievement by elementary school students was developed from 50 initial items from the literature rated for content validity by 30 experts. The ratings rendered 31 revised items used for exploratory factor analysis and reliability tests. The 31 items were administered to 183 elementary students in 4th, 5th, and 6th grades, yielding 4 factors : enjoyment, confidence, value, and motivation with high inter-items consistency. To confirm appropriateness of the constructed model and to test its predictability in mathematics achievements, confirmative factor analysis and discriminant analysis were performed on 693 cases. Results showed that the attitude scale model of 4 factors can be recommended for use in the measurement of elementary school students' attitudes toward mathematics.

• 우울조울병
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• 제15권3호
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• pp.123-129
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• 2017

Objective : To present effects of depression, optimism and gratitude on suicidal ideation of patients with depressive disorders. Methods : Using analyses of covariance (ANCOVA), scores on the Beck Depression Inventory (BDI), Life Orientation Test-Revised (LOT-R), and Gratitude Questionnaire (GQ-6) were compared between depressive disorder patients with higher and lower levels of suicidal ideations. A linear regression model was fitted to detect independent correlates for suicidal ideations. Results : Significantly greater level of depression and lower level of gratitude were characterized by depressive disorder patients with higher level of suicidal ideations. The fitted regression model presented that depression and gratitude were independent correlates for suicidal ideations in patients with depressive disorders. Conclusion : Our findings suggest that gratitude may be associated with lowering the level of suicidal ideation in patients with depression.

• 한국직업건강간호학회지
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• 제20권1호
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• pp.35-45
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• 2011

Purpose: The purpose of this study was to propose and to test a predictive model that could explain the workers' quality of life. Methods: Data were collected using self-report questionnaires from 901 workers in Daejeon, Korea. The questionnaires included nine measured variables (safety culture, self-efficacy, activity of occupational health provider, knowledge in occupational health, age, health promotion behavior, workplace environment, health level, and quality of life), as revised PRECEDE model has suggested. The collected data were analyzed using SPSS/WIN 15 and AMOS 6.01 version. Results: Based on the constructed model, behavior, environment, and health were found to have significant direct effect on quality of life. Indirect factors were perceived biological, predisposing, reinforcing, and enabling. The proposed model was concise and extensive in predicting quality of life of the participants. The final modified model yielded GFI=.85, AGFI=.89, NFI=.79, and RMSEA=.11 and exhibited good fit indices. Conclusion: Findings of this study may contribute to development of effective nursing interventions for promoting quality of life in workers.

• 한국의류학회지
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• 제34권8호
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• pp.1341-1351
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• 2010

The Korean jean market has become increasingly competitive due to the increased imports of global brands. This study is to understand the purchase behaviors of Korean college students toward foreign brand jeans to help Korean jean brands enhance their competitive advantages over foreign brand jeans in the Korean market. Considering perceptions of Korean consumers toward foreign brands and traditional value changes, this study proposed a research model incorporating two extended behavioral intention (BI) models, Lee's modified BI model and Ajzen's theory of planned behavior. To test the research model, a total of 240 valid data sets were collected from college students in Busan, Korea. Structural and measurement models were estimated using LISREL 8.80. Because face saving failed to attain internal validity, the research model was revised to eliminate face saving. The findings indicated that perceived behavioral control had the strongest direct influence on purchase intentions of Korean college students for foreign brand jeans. Group conformity and subjective norm had non-significant direct impacts on purchase intention, whereas group conformity had an indirect impact on purchase intention through attitude. Based on the findings, theoretical and managerial implications were provided.