• Structural Engineering and Mechanics
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• v.59 no.6
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• pp.1139-1153
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• 2016

Elastic constraints are usually simplified as "spring forces" exerted on beam ends without considering the "spring deformation". The partial differential equation governing the free vibrations of a cantilever Bernoulli-Euler beam considering the deformation of elastic constraints is firstly established, and is nondimensionalized to obtain two dimensionless factors, $k_v$ and $k_r$, describing the effects of elastically vertical and rotational end constraints, respectively. Then the frequency equation for the above Bernoulli-Euler beam model is derived using the method of separation of variables. A numerical analysis method is proposed to solve the transcendental frequency equation for the continuous change of the frequency with $k_v$ and $k_r$. Then the mode shape functions are given. Finally, effects of $k_v$ and $k_r$ on free vibration characteristics of the beam with different slenderness ratios are calculated and analyzed. The results indicate that the effects of $k_v$ are larger on higher-order free vibration characteristics than on lower-order ones, and the impact strength decreases with slenderness ratio. Under a relatively larger slenderness ratio, the effects of $k_v$ can be neglected for the fundamental frequency characteristics, while cannot for higher-order ones. However, the effects of $k_r$ are large on both higher- and lower-order free vibration characteristics, and cannot be neglected no matter the slenderness ratio is large or small.

• Journal of Korea Technology Innovation Society
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• v.20 no.3
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• pp.684-708
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• 2017

This paper investigates the effects of transformational leadership and transactional leadership on the creativity of members in R&D organizations. We also analyze the leadership mechanism and the influence of effective environment by using team climate as a mediator and using adhocracy and hierarchy organizational culture as moderator. Data were collected through surveys of Korean Public Research Institutes conducting mainly basic science and applied sciences. 327 valid samples were tested using a structural equation model (SEM). Empirical results confirm that transactional leadership exhibits stronger direct effect on the creativity than transformational leadership. However, in indirect effects mediated by creative team climate, transformational leadership is found to be stronger than transactional leadership. It may reflect the characteristics of R&D organization. Also, through the verification of the moderating effect of the organizational culture, the adhocracy organizational culture appears to improve the creativity and the hierarchical organizational culture appears to inhibit the creativity. It is confirmed that the influence of organizational culture is statistically significant in R&D organizations with strong autonomy and independence. It is suggested that the leadership on the creativity of the members in the R&D organization may be indirect in the context of the team and the organization as well as the direct effects according to the type.

• The Journal of the Korea Contents Association
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• v.14 no.10
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• pp.639-648
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• 2014

As provider-centered medical environment has changed into consumer-centered, this study intends to improve the efficiency of management by motivation to administrative staffs and improvement in job satisfaction. The purpose of this study is to analyze the factors that influence job satisfaction among administrative staffs in a metropolitan university hospitals. Survey of 305 people in total were used in the data analysis. AMOS 21 Ver. was used to perform Structural model(SEM) equation. First, the validation results showed the follow results $X^2=206.776$, df=77, Q=2.685, P<.001, GFI=.915, TLI=.927, CFI=.946, RMSEA=.074, which supported this research's significance. Second, compensation and working conditions positively affected motivation. Third, motivation positively influenced job satisfaction. Fourth, communication positively influenced job satisfaction. Fifth, after adjusting the mediating effect, in the relationship between compensation and job satisfaction, it was proved that motivation was a complete mediator. Incase of the relationship between the working conditions and job satisfaction, motivation acted as a partial mediator. Fair and reasonable compensation and employment stability, benefits and other working conditions, better internal and external communication between the organization are to increase job satisfaction. To do this, an administrator needs to have attention and will, and a variety of education and training programs need to be developed. The purpose of this study is to provide basic grounds for future policies related to increasing administrative staffs' job satisfaction.

• Korean Journal of Social Welfare
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• v.59 no.2
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• pp.303-325
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• 2007

This study explores the relationship between marketing activities and brand equity in nonprofit organizations, specifically investigating the relational linkage between four selected marketing mix elements and brand equity through the mediating role of brand equity dimensions. Employing a structural equation model, the study empirically tests research hypotheses and finds some important implication for brand equity creation strategies for nonprofits. The results show that brand association is the only dimension that is positively related to brand equity, reflecting the current donation market in Korea where nonprofits have such a low presence that donors have little knowledge and chance to identify their brands and to build trust relationships with them. Furthermore, the results highlight the importance and roles of promotion and process marketing efforts, as they are proved to enhance brand association. The study also finds that promotion is positively related to brand awareness and process contributes to perceived quality and brand loyalty. Based on these findings, the study suggest that nonprofits make further efforts on active promotion and process development to create positive, differentiated images and better accessibility, and finally improve their brand equity.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.7 no.1
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• pp.59-66
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• 2013

This study rehabilitation assistive technology system for people with disabilities employed by a company in the field of occupations and job satisfaction have adapted to, and for the rehabilitation assistive technology support(rehabilitation assistive technology hardware and the software) and service quality based on the quality of convenient for employees to work life by analyzing the factors that can act on adaptation employees on behavioral intentions was to determine the overall impact. Seoul, Gyeonggi, Incheon companies based in vocational education and training received in the employment of the disabled subject questionnaires were distributed, and finally 594 valid questionnaires were minor. In order to test the hypothesis SEM(structural equation model) were used, the results of this study can be summarized as follows. First, rehabilitation assistive technology hardware quality of the quality of rehabilitation assistive technology software affected. Second, rehabilitation assistive technology software quality on the quality of the service quality affected. Third, rehabilitation assistive technology hardware quality on the quality of the service quality affected. Fourth, quality of service, the quality of the adaptation of action for employees affected also. Fifth, rehabilitation assistive technology software for adaptive quality of the employees also had an impact on behavior. Sixth, rehabilitation assistive technology hardware to adapt the quality of the employees affected. And parameters (quality of service quality) influenced to as indirect effects. The results of this study support the rehabilitation assistive technology and rehabilitation assistive technology hardware and software) based, quality of service and quality of fused form acceptable to, the degree of action for employees to adapt more implications that may affect have provided.

• Journal of Digital Convergence
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• v.19 no.7
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• pp.155-162
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• 2021

The purpose of this study is to investigate effects of management support for health and safety on workers' safety perception. Since the 1990s, Korea's national competitiveness has been rising rapidly, but efforts to prevent and cope with industrial accidents are still insufficient. Particularly there is a big movement to strengthen corporate responsibility for serious accidents in the 2020s. In this study structural equation model(SEM) was constructed and quantitatively analyzed in order to know how management's support affects the organization, system, and communication related to safety and health in the company, and ultimately how it has an effect on workers' safety perception. 4,169 questionnaires conducted by the Institute for Occupational Safety and Health were used as observation variables, and 5 hypotheses were established and were verified in SEM. As management support increases, organization & institution for a safe workplace, communication related with safety and health within the company become more active. Finally management support has a positive effect on workers' safety perception. The results of this study imply that management needs to increase awareness of the importance of safety and health before all measures such as organizations, institutions, and communication related to safety and health.

• Journal of Korea Entertainment Industry Association
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• v.13 no.8
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• pp.25-39
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• 2019

This study analyzed the relation among middle-aged women's interesting factor of golf and intention of continuous behavior and verified the mediation effect of Flow in leisure. The purpose is to clarify the process in which middle-aged women'change their life to positive direction through golf activity and to provide basic data on the basis of theoretic fundamental. The data was processed with Confirmatory Factor Analysis(CFA) & Structural Equation Model(SEM) by using Exploratory Factor Analysis(EFA) & AMOS 25.0 statistical program through SPSS 25.0 Window Version. The result is as follows. First, interesting factor of golf is found to have significant influence on Flow of leisure. Second, interesting factor of golf is found to have significant influence on intention of continuous behavior. Third, Flow of leisure is found to have significant influence on intention of continuous behavior. Finally, Flow of leisure is found to have partial mediation effect in the relation among interesting factor of golf and intention of continuous behavior. Thus, it is judged that enjoyment should be ensured precedently through the interesting factors of golf to develop golf industry and to induce middle-aged women golf participants to golf course. It is thought that diversified methods which can increase satisfaction by utilizing leisure immersion and which can ensure constant participation for this purpose.

• Structural Engineering and Mechanics
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• v.28 no.2
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• pp.129-152
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• 2008

This paper considers the solution of the stochastic differential equations (SDEs) with random operator and/or random excitation using the spectral SFEM. The random system parameters (involved in the operator) and the random excitations are modeled as second order stochastic processes defined only by their means and covariance functions. All random fields dealt with in this paper are continuous and do not have known explicit forms dependent on the spatial dimension. This fact makes the usage of the finite element (FE) analysis be difficult. Relying on the spectral properties of the covariance function, the Karhunen-Loeve expansion is used to represent these processes to overcome this difficulty. Then, a spectral approximation for the stochastic response (solution) of the SDE is obtained based on the implementation of the concept of generalized inverse defined by the Neumann expansion. This leads to an explicit expression for the solution process as a multivariate polynomial functional of a set of uncorrelated random variables that enables us to compute the statistical moments of the solution vector. To check the validity of this method, two applications are introduced which are, randomly loaded simply supported reinforced concrete beam and reinforced concrete cantilever beam with random bending rigidity. Finally, a more general application, randomly loaded simply supported reinforced concrete beam with random bending rigidity, is presented to illustrate the method.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.1
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• pp.17-31
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• 2020

In this study, a study was conducted to analyze the factors affecting the acceptability for autonomous vehicles. The previous studies were reviewed to sturdy the acceptance factors and The PLS Structral equation model was used to analyze the acceptance factors. While the existing research focused on technical safety, this study comprehensively analyze safety, convenience, economy, environment, and ethical factors. The PLS model was analyzed to significant the factors that affect the acceptability for autonomous vehicles in the order of safety, economy, convenience and environment.

• Journal of Digital Convergence
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• v.10 no.8
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• pp.327-333
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• 2012

The objective of this study is to explore the structural relationships between positive parenting style, self-efficacy, stress, depression, and school adjustment of adolescents. The data in this study used from the 2010 Korea Youth Health Status Survey(N=7,187). To explore these relationships between each variable showed in this study model, structural equation modelling(SEM) was carried out by using IBM SPSS AMOS Ver. 19.0. The main findings of this study are as follows; Firstly, The positive parenting style made a positive effect on self-efficacy, and reduced the stress and depression, eventually affected school adjustment positively. Secondly, the more self-efficacy, and the less stress and depression. And the more self-efficacy, and the more school adjustment. Thirdly, as considering the indirect effect of positive parenting style on school adjustment through the mediating variable as self-efficacy, positive parenting style is more important variable than any other factors. These results implies that positive and intimate parent-children relationships or parenting attitudes on adolescents are necessary highly.