The global market is experiencing stagnation and recession in the “untact era”, and the emergence of the metaverse provides platform support and presents a new paradigm. This study aims to provide a framework for content creators and marketers to verify the effectiveness of metaverse marketing. An analysis was carried out of the fit of the model and the hypotheses between the metaverse seamlessness, presence, interoperability, concurrence, and economic flow (SPICE) model factors, customer satisfaction, and purchase intention. In the test, 9 out of 11 hypotheses were accepted. In conclusion, the data are meaningful, and this study presents the value of music content marketing in the metaverse through the metaverse SPICE model.

Background: The look-back period is needed to define baseline population for estimating incidence. However, short look-back period is known to overestimate incidence of diseases misclassifying prevalent cases to incident cases. The purpose of this study is to evaluate the impact of the various length of look-back period on the observed incidences of uterine leiomyoma, endometriosis and adenomyosis, and to estimate true incidences considering the misclassification errors in the longitudinal administrative data in Korea. Methods: A total of 319,608 women between 15 to 54 years of age in 2002 were selected from Korea National Health Insurance Services (KNHIS) cohort database. In order to minimize misclassification bias incurred when applying various length of look-back period, we used 11 years of claim data to estimate the incidence by equally setting the look-back period to 11 years for each year using prediction model. The association between the year of diagnosis and the number of prevalent cases with the misclassification rates by each look-back period was investigated. Based on the findings, prediction models on the proportion of misclassified incident cases were developed using multiple linear regression. Results: The proportion of misclassified incident cases of uterine leiomyoma, endometriosis and adenomyosis were 32.8, 10.4 and 13.6% respectively for the one-year look-back period in 2003. These numbers decreased to 6.3% in uterine leiomyoma and − 0.8% in both endometriosis and adenomyosis using all available look-back periods (11 years) in 2013. Conclusion: This study demonstrates approaches for estimating incidences considering the different proportion of misclassified cases for various length of look-back period. Although the prediction model used for estimation showed strong R-squared values, follow-up studies are required for validation of the study results.

Drug stability and sustained release issues are important areas in drug-delivery research. The sustained release of proteins can be achieved by their encapsulation with a hydrophobic polymer, but this requires the proteins to be protected from the harsh processing environments of organic solvents and mechanical force. Preencapsulation with poly(vinyl alcohol) (PVA) using a freeze/thaw method has been shown to allow successful protection and sustained release. This study examined the effects of freezing/thawing on PVA encapsulation in the preparation of PVA-PLGA composite particles. Freezing/thawing slightly improved the crystalline peaks and the heat of fusion of PVA, but more distinct differences were observed when the properties of the surface layers were probed by AFM. The hardness of particles' surfaces increased with increasing number of freezing/thawing cycles, whereas the adhesion force with an AFM cantilever tip decreased. The mean particle size and entrapment efficiency decreased. These results suggest that surface hardening is the major mechanism responsible for the sustained release characteristics.

This study examines how shop managers’ attitudes toward customers are transferred to sales employees, and thus affect customer performance. We surveyed shop managers, sales employees, and customers in five department stores in Seoul, South Korea, in June 2021 to determine the relationships among service orientation, customer orientation, customers’ perceptions of sales employees’ authenticity, and customer performance. We found that sales managers’ service orientation positively influences sales employees’ service and customer orientation. Furthermore, this orientation positively correlates with customers’ perceptions of sales employees’ authenticity, thereby improving service performance and customer loyalty. Few studies have examined how institutional-level capacity and attitudes influence employees within organizations and how this, in turn, affects service performance. Thus, this study theoretically and empirically explores how sales managers’ attitudes and sales behaviors are transferred to sales employees and how this affects customer performance. The research findings fill a gap in the current understanding of customer performance in the service industry.

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