• Korean Journal of Optics and Photonics
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• v.33 no.6
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• pp.275-286
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• 2022

As a first step in the optical design process, we derive a recursive numerical calculation method that can give a solution to the Gaussian equation that the paraxial rays satisfy. Given the refractive power, the angle of incidence to the first principal plane of the lens, the angle of exit to the second principal plane of the lens, and the distance between the principal planes, the radii of curvature of the front and back surfaces of a lens can be obtained by applying the recursive numerical calculation method proposed in this paper according to the thickness of the lens. If a module consists of two or more lenses, the thickness and radius of curvature of each lens can be similarly determined after selecting the distance between the principal planes of the lens under the condition of the design specification while increasing the number of lenses one by one.

• 한국노년학
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• v.37 no.2
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• pp.385-398
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• 2017

This study aims to identify the service quality perceived by Elderly Care Service users on the basis of 'SERVPERF model' targeting the service users, and verify the mediation effects of the choice which affects the relationship between information literacy and quality. For this, 208 elderly care comprehensive service users in Jeollabuk-do were analyzed as the targets using a structural equation. The results of this study are as follows. First, service users perceived the quality level to be very high. Second, user's information literacy has a significant effect on quality perception. Third, the effect of user 's information literacy on quality was partially mediated by choice. These results suggest that there is a need to provide enough information and opportunities for users to make choices in order to maintain a high quality of service.

• Journal of Convergence for Information Technology
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• v.11 no.7
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• pp.223-231
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• 2021

The study analyzes the relationship between job stress, organizational trust, and the job change intentions of beauty industry workers. Three-hundred sixty-nine workers in the beauty industry with longer than three months of working experience were chosen as this study. The study used to perform frequency analysis, exploratory factor and reliability, correlation, confirmation, and structural equation model verification. The following results are as follows. First, job stress had a positive influence. Second, stress related to fairness had a negative effect on organizational trust. Third, organizational trust had a negative effects. In conclusion, organizational trust and stress related to fairness are the important variables. Furthermore, this study suggests that each organization needs to make an effort to increase organizational trust and to relieve stress related to fairness in order to reduce the job change intentions.

• Journal of Korea Entertainment Industry Association
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• v.15 no.6
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• pp.165-178
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• 2021

The purpose of this study is to see if student support directly affects on the burnout of reduction of high school teachers. The subjects are high school teachers in Seoul, Gyeonggi and Busan. A total of 353 people were surveyed and the final 352 people were confirmed as analysis units, except for one untrustworthy response. The collected data were analyzed using SPSS 20.0 and AMOS 16.0, and structural equation analysis was conducted to verify the effect of student support on the burnout of high school teachers. The study was conducted to a reconstruct survey with significant factor as an embodying the concept and measurement tools of student support. The main findings are as follows: First, student support has been shown to reduce emotional exhaustion, a sub-variant of burnout. Second, student support has been shown to reduce depersonalization. Third, student support has been shown to reduce a sense of personal achievement. This study is significant to demonstrate its effectiveness by using the student's support for social support teachers in order to reduce the burnout of high school teachers even there were no previous studies.

• Journal of Convergence for Information Technology
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• v.11 no.8
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• pp.151-159
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• 2021

The purpose of this study was to examine the mediating effects of Positive Psychological Capital on the relationship between Small Business Enterpreneur's Learning Goal Orientation and Work Engagement. In order to achieve the purpose of research, the survey results of 300 small business Enterpreneurs who participated in the K-BIZ's Small Business Enterpreneurs Support Program were used for analysis. The collected data were analyzed using frequency analysis, reliability analysis, confirmatory factor analysis, descriptive statistical analysis, correlation analysis and structural equation model. The results of this study were as follows: First, learning goal orientation of small business enterpreneurs had positive effect on positive psychological capital. Second, positive psychological capital of small business enterpreneurs had positive effect on work engagement. Third, positive psychological capital of small business enterpreneurs had full mediating effect on the relationship between learning goal orientation and work engagement. Based upon these results, several suggestions were suggested to promote small business enterpreneurs' learning goal orientation, work engagement, and positive psychological capital.

• 한국체육학회지인문사회과학편
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• v.58 no.1
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• pp.187-201
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• 2019

This study aims to analyze the relationship among emotional labor, Job burnout, and organizational citizenship behavior(OCB) of yoga instructors. Especially, we focused on the mediating effect of job burnout between emotional labor and OCB. A total of 250 questionnaires were distributed and 221 were returned for final analysis. In order to verify the hypothesis, structural equation modeling was conducted using AMOS 23.0. The results of this study were as follows: First, surface acting had a positive effect on job burnout, but deep acting had no significant effect on job burnout. Second, job burnout had a negative effect on OCB. Third, Surface acting had no effect on OCB, but deep acting had a positive effect on OCB. Last, the relationship between surface acting and OCB was perfectly mediated by job burnout, however there was no mediating effect of job burnout between deep acting and OCB.

• Journal of Convergence for Information Technology
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• v.12 no.5
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• pp.202-211
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• 2022

The purpose of this study is to investigate the relationship between job stress, job autonomy, employee support evaluation, and the turnover intentions of workers in the beauty and cosmetics industry. This study assessed 570 workers with 3 months or more of experience in the beauty and cosmetics industry. Data processing was achieved through analyses of frequency, descriptive statistics, exploratory factors, reliability, correlation, and confirmatory factors, as well as the verification of the structural equation model. The results of the study are as follows: first, employee support evaluation in the beauty and cosmetics industry workers was negatively correlated to job stress. Second, employee support evaluation showed a negative relationship with turnover intentions. Third, job stress was found to have a positive relationship with turnover intention.This study suggests that, in order to reduce the turnover intentions of beauty and cosmetics industry workers, it is necessary for employers to make efforts to manage employees' job autonomy, support evaluation, and stress levels.

• Journal of radiological science and technology
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• v.46 no.4
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• pp.325-336
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• 2023

The purpose of this study was to analyze the structural relationship between job satisfaction levels felt during ultrasound examination of radiological technologists (RTs) using a structural equation model. The subjects were a total of 203 RTs currently working in medical institutions. The method was conducted as a survey study using a questionnaire consisting of a total of 29 questions consisting of demographic characteristics and job satisfaction levels that were self-efficacy, job competency, extrinsic compensation, and job satisfaction. The reliability was secured with the Cronbach's alpha coefficient of 0.6 or higher. For statistical analysis, a significant difference between the frequency analysis of demographic characteristics and the mean of the job satisfaction levels were performed by independent sample T-test and one-way analysis of variance (ANOVA) followed by Scheffe's post hoc test. The correlation analysis between variables was tested with Spearman's and Pearson's correlation coefficient. We analyzed the structural relationships between variables by structural equations. As a result, first, job competency and extrinsic compensation had a positive effect on job satisfaction on ultrasound examination of RTs. Second, the self-efficacy of ultrasound examination RTs showed a high correlation with job competency. Third, the job satisfaction levels showed in the order of job competency, job satisfaction, self-efficacy, and extrinsic compensation. In conclusion, this study are expected to be provided as data to identify factors that could improve job satisfaction during ultrasound examination of RTs by empirically analyzing the structural relationship of self-efficacy, job competency, and external compensation.

• Structural Engineering and Mechanics
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• v.87 no.6
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• pp.529-540
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• 2023

A novel laminated-hybrid-composite-beam (LHCB) of glass-epoxy infused with flyash and graphene is constructed for this study. The conventional mixture-rule and constitutive-relationship are modified to incorporate filler and lamina orientation. Eringen's non-local-theory is used to include the filler effect. Hamilton's principle based on fifth-order-layer-wise-shear-deformation-theory is applied to formulate the equation of motion. The analogous shear-spring-models for LHCB with multiple-cracks are employed in finite-element-analysis (FEA). Modal-experimentations are conducted (B&K-analyser) and the findings are compared with theoretical and FEA results. In terms of dimensionless relative-natural-frequencies (RNF), the dynamic-response in cantilevered support is investigated for various relative-crack-severities (RCSs) and relative-crack-positions (RCPs). The increase of RCS increases local-flexibility in LHCB thus reductions in RNFs are observed. RCP is found to play an important role, cracks present near the end-support cause an abrupt drop in RNFs. Further, multiple cracks are observed to enhance the nonlinearity of LHCB strength. Introduction of the first to third crack in an intact LHCB results drop of RNFs by 8%, 10%, and 11.5% correspondingly. Also, it is demonstrated that the RNF varies because of the lamina-orientation, and filler addition. For 0° lamina-orientation the RNF is maximum. Similarly, it is studied that the addition of graphene reduces weight and increases the stiffness of LHCB in contrast to the addition of flyash. Additionally, the response of LHCB to moving mass is accessed by appropriately modifying the numerical programs, and it is noted that the successive introduction of the first to ninth crack results in an approximately 40% to 120% increase in the dynamic-amplitude-ratio.

• Journal of Information Technology Applications and Management
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• v.29 no.6
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• pp.43-62
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• 2022

As the used trading market grows centered on online platforms, it is evolving from practical consumption to pursuing various forms of consumption value. Consumers purchase rare products, enjoy the transaction itself with consumers with the same preference, and investment or eco-friendly value consumption is also increasing. In this regard, the transaction of the second-hand transaction app service must have sincerity in order to respond to various consumption values. In addition, it is necessary to study what components the second-hand trading app service should aim for to secure authenticity and how the usefulness and ease of second-hand trading apps affect the relationship. The research used a questionnaire method to test hypotheses and surveyed 215 consumers in their 20s, 30s, and 40s who had purchased used clothing online within a year. Among them, 200 responses, excluding outliers, were statistically analyzed using SPSS 21.0 and AMOS 22.0 as confirmatory factor analysis and structural equation models. This study aims to determine the effect of the authenticity of the online used trading app service on the satisfaction of the used trading app service. To this end, based on the previous research results, the following research hypotheses were established and verified statistically. First, the authenticity of the online used trading app service will significantly impact the satisfaction of the used trading app service. Second, the usefulness of the used trading app service will have a moderating effect on the effect of the authenticity of the used trading app service on the satisfaction of the used trading app service. Third, the ease of the used trading app service will have a moderating effect on the authenticity of the used trading app service on the satisfaction of the used trading app service. As a result of the study, the authenticity of the used trading app service significantly affected the satisfaction of the used trading app service. Appeared to be The results of this study will help understand used transaction app services where consumption of used products occurs from the viewpoint of product circular use behavior and can be used as a strategic plan to promote the use of used transaction apps in the future.