• Journal of Korean Society on Water Environment
• /
• v.25 no.1
• /
• pp.48-57
• /
• 2009

A two-dimensional (2D), laterally-averaged hydrodynamic and water quality model, CE-QUAL-W2 was applied to evaluate the performance on simulating the effect of flushing from Daecheong Reservoir on the downstream water quality variations during the flushing events held on November, 2003 and March, 2008. The hydraulic and water quality simulation results were compared with field measurement data, as well as a one-dimensional (1D), unsteady model (KORIV1) that revealed limited capability in the previous study due to missing the resuspension process of river bottom sediments. The results showed that although the 2D model made satisfactory performance in reproducing the temporal variations of dissolved matters including phosphate, ammonia and nitrate, it revealed poor performance in simulating the increase of biological oxygen demand and suspended sediment (SS) concentrations during the passage of the flushing flow. The reason of the error was that the resuspension process of the 2D model is only the function of shear stress induced by wind. In reality, however, as shown by significant correlation between bottom shear stress ($\tau$) and observed SS concentration, the resuspension process can be significantly influenced by current velocity in the riverine system, especially during flushing event. The results indicate that the resuspension of river bottom materials should be incorporated into the water quality modeling processes if $\tau$ is greater than a critical shear stress (${\tau}_c$) for better simulation of flushing effect.

• Journal of Korean Academy of Nursing
• /
• v.48 no.5
• /
• pp.622-635
• /
• 2018

Purpose: This study aimed to develop and test a structural model for sleep quality in female shift work nurses. The hypothetical model was constructed on the basis of Spielman's 3P model of insomnia and previous research related to the sleep quality of shift nurses. Methods: This cross-sectional study used structural equation modeling and recruited 285 female shift work nurses from four general and university hospitals with over 300 beds located in C and J cities in Gyeongsangnamdo. Data were collected from September 27 to October 20, 2016, and then analyzed using descriptive statistics, Pearson's correlation, and structural equation modeling. The study used SPSS/Win 18.0 and AMOS 18.0 in processing the data. Results: The final model showed good fit to the empirical data: ${\chi}^2/df=2.19$, SRMR=.07, RMSEA=.07, AGFI=.85, TLI=.91, GFI=.93, GFI=.89, NFI=.87. The factors that influenced sleep quality were sleep hygiene (${\beta}=.32$), perceived shift work status (${\beta}=-.16$), stress response (${\beta}=.16$), shift work experience (${\beta}=.15$), perceived health status (${\beta}=-.14)$, and circadian rhythm (${\beta}=-.13$) explaining 36.0% of the variance. Conclusion: The model of sleep quality of the shift work nurses constructed in this study is recommended as a model to understand and predict the sleep quality of shift work nurses. The results suggest that strategies for improving the sleep quality of shift work nurses should focus on sleep hygiene, perceived health status, stress response, circadian rhythm, perceived shift work status, and shift work experience.

• Asia Marketing Journal
• /
• v.17 no.2
• /
• pp.73-96
• /
• 2015

This paper investigates how servicescape perception influences customer experience quality in hedonic service settings. In addition to the direct effect of servicescape quality on customer experience quality, the indirect effects of servicescape quality on customer experience quality via employee-to-customer interaction quality and peer-to-peer interaction quality are also investigated. We collected data through a self-administered survey. The proposed relationships were tested using structural equation modeling. The results show that servicescape quality influences customer experience quality both directly and indirectly through employee-to-customer interaction quality and peer-to-peer interaction quality, and customer experience quality influences customer loyalty. Additionally, we find that the indirect path via peer-to-peer interaction quality is significant only in a low-satisfaction customer group. The indirect effect of servicescape quality perception through peer-to-peer interaction quality is significant only in low-satisfaction customer groups. Therefore, if evaluations for this indirect effect fall below an acceptable level, it should be addressed first before improving on other attributes. However, after this point, further improvements offer few if any gains; therefore, service firms should allocate their resources to quality improvements to other factors. This study is the first to investigate the indirect effects of servicescape quality on customer experience quality via peer-to-peer interaction quality in hedonic service settings. Additionally, this study demonstrates that the significance of this indirect effect applies only to a low-satisfaction customer group.

• Journal of Distribution Science
• /
• v.12 no.9
• /
• pp.39-45
• /
• 2014

Purpose - This study aims to explore whether investing in cultural centers enhances the image and performance of corporations, and seeks to identify the effects of the relationship quality of cultural centers on the relationship quality of discount stores. Research design, data, and methodology - To accomplish the objective, a survey was conducted on the users of the cultural center of NH Hanaro Club's S Branch. Regarding the questionnaires, 155 copies were distributed and 139 were used as valid data responses, which were analyzed through a descriptive statistical analysis, correlation analysis, and a path analysis with structural equation modeling. Results -Cultural centers are lifelong educational institutions revolving around females, and corporations can improve their image and performance through cultural centers in pursuit of profits. Moreover, the reliability and responsiveness of cultural centers positively influenced their relationship quality and that of discount stores. Conclusion - Customer service should be provided promptly and sincerely to achieve maximum customer satisfaction. This will boost the relationship quality of cultural centers, and positive customer evaluation will lead to better relationship quality of the discount stores.

• Journal of Korean Society for Quality Management
• /
• v.35 no.3
• /
• pp.55-65
• /
• 2007

The purpose of this study is to analyze the causal relationship among categories in the Korean National Quality Award(KNQA) model. The survey instrument consists of 79 questions from seven categories in the KNQA. Structural Equation Modeling(SEM) is used to analyze the empirical data and estimates the path coefficients among the KNQA categories. The result of this research indicates that Leadership drives systems that create Results through Foundation and Direction. Among eighteen hypotheses, sixteen hypotheses are statistically significant. Especially, this research indicates that Foundation and Direction are important mediating factors.

• Journal of Korean Society for Quality Management
• /
• v.47 no.2
• /
• pp.255-269
• /
• 2019

Purpose: We examine the impact of Customization of TV Home Shopping Mobile Applications on Service Quality and Customer Loyalty. Methods: We collect data by using survey and proposed relationships between latent variables using Structural Equations Modeling. Results: We find that Customization of TV Home Shopping Mobile Applications positively affect Service Quality and Customer Loyalty. In addition, service quality work as a mediate variable between Customization with Customer Loyalty. Conclusion: Our findings explain the significant relationships between each variables and hence it is necessary to consider Customization and Service Quality in order to achieve desired goal of enhancing business performance through mobile applications.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 1998.11a
• /
• pp.295-300
• /
• 1998

Recently graphical modelling is being studied as a useful process analysis tool for exploratory causal analysis. Graphical modelling is a presentation method that uses graphs to describe statistical models of the structures of multivariate data. This paper describes an application of this graphical modeling with two cases from the automotive parts industry. One case is the unbalance problem of the pulley, an automotive generator part. There is multivariate data of the product from each of the processes which are connected in the series. By means of exploratory causal analysis between the variables using graphical modeling, the key processes which causes the variation of the final characteristics and their mechanism of the causal relationship have become clear. Another case is, also, the unbalanced problem of automotive starter parts which consists of many parts and is manufactured by complex machinery and assembling process. By means of the similar technique, the key processes are obtained easily and the results are reasonable from technical knowledge.

• Journal of Korean Society for Quality Management
• /
• v.26 no.4
• /
• pp.111-123
• /
• 1998

We consider the problem of modeling count data where the observation period is determined by the life time of the system under study. We assume random effects or a frailty model to allow for a possible association between the death times and the counts. We assume that, given a random effect or a frailty, the death times follow a Weibull distribution with a hazard rate. For the counts, given a frailty, a Poisson process is assumed with the intensity depending on time. A gamma distribution is assumed for the frailty model. Maximum likelihood estimators of the model parameters are obtained. A model for the time to death and the number of failures system received is constructed and consequences of the model are examined.

• Journal of Korean Society for Quality Management
• /
• v.32 no.4
• /
• pp.113-124
• /
• 2004

Customer satisfaction is becoming an increasingly salient topic in many firms and in academic research. One main rationale behind this interest is that customer satisfaction is believed to be associated with fruitful customer re-visit from the firm's point of view. Some country already had index models which can measure the degree of customer satisfaction. But, such models are ordinary models which used generally the scope of nation-wide /industry. Therefore, we needs some modifications to measure customer satisfaction for specific product & service and to provide the valuable feedback to specific firms. In this Perspectives, this study will evaluate the customer satisfaction index about automobile company and analyze it's result for valuable feedback. This study will present a model for an integrated customer satisfaction evaluation system which used structural equation modeling. Through this study, we anticipate that it will offer the measuring method about customer satisfaction and some guideline for product design process.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2006.11a
• /
• pp.267-274
• /
• 2006

This paper reports on a study investigating key attributes of service recovery strategies in internet shopping mall. In theses day, service recovery has received important attention in the service operation management literature. Service recovery involves those actions designed to resolve problems, alter negative attitudes of dissatisfied consumers and to ultimately retain these customers. The study examined that service recovery strategies(apology, value added, speed of recovery, empowerment) impact on the customer satisfaction and customer loyalty with SEM(Structural Equation Modeling). This study can be used a strategic implication for internet shopping mall managers to develop successful service recovery strategies.