ABSTRACT
This study examines the core factors that determine consumer choices of distribution channels for fresh food during the COVID‐19 pandemic, focusing on online distribution channels and the substitution patterns between online and offline distribution channels. Using 1436 responses to a survey conducted by Gallup Korea, a specialized survey agency in Korea, we adopted a multivariate probit model for the empirical analysis. The results show that consumers who pursued ease of use or had high awareness of online food delivery tended to choose online distribution channels for fresh food, unlike consumers who were sensitive to high quality or low prices. Consumers with high consumer spending, who are living in Seoul or a metropolitan area, have children of 10 years old or younger, and have a high educational level had positive relationships with the choice of an online distribution channel. Additionally, the estimates of the variance‐covariance matrix showed a complementary relationship between large markets and small and medium‐sized markets, with the possibility of a weak substitution effect between small and medium‐sized markets and online distribution channels.
ABSTRACT
The worldwide proliferation of COVID-19 poses the urgent need for sterilizable and transparent air filters to inhibit virus transmission while retaining ease of communication. Here, we introduce copper nanowires to fabricate transparent and self-sterilizable air filters. Copper nanowire air filter (CNAF) allowed visible light penetration, thereby can exhibit facial expressions, helpful for better communication. CNAF effectively captured particulate matter (PM) by mechanical and electrostatic filtration mechanisms. The temperature of CNAF could be controlled by Joule-heating up to 100 °C with thermal stability. CNAF successfully inhibited the growth of E. coli because of the oligodynamic effect of copper. With heat sterilization, the antibacterial efficiency against G. anodireducens was greatly improved up to 99.3% within 10 min. CNAF showed high reusability with stable filtration efficiency and thermal antibacterial efficacy after five repeated uses. Our result suggests an alternative form of active antimicrobial air filter in preparation for the current and future pandemic situations.