To meet the needs of today's library users, institutions are developing library mobile apps (LMAs), as their libraries are increasingly intelligent and rely on deep learning. This paper explores the influencing factors and differences in the perception of LMAs at different time points after a user has downloaded an LMA. A research model was constructed based on the technology acceptance model. A questionnaire was designed and distributed twice to LMA users with an interval of three months to collect dynamic data. The analysis was based on structural equation modeling. The empirical results show that the perceived ease of use, the perceived usefulness, the social influence, and the facilitating conditions affected the users' behavioral intention, but their impacts were different at different times. As the usage time increases, the technology acceptance model is still universal for understanding the user perception of LMA. In addition, two extended variables (social impact and convenience) also affect the user's behavior intention. User behavior is dynamic and changed over time. This study is important both theoretically and practically, as the results could be used to improve the service quality of LMAs and reduce the loss rate of users. Its findings may help the designers and developers of LMAs to optimize them from the perspective of a user and improve the service experience by providing a deeper understanding of the adoption behavior of information systems by LMA users.

<p>This study investigated the determinants of mobile payment adoption in Taiwan. Based on Social Cognitive Theory (SCT) and the fundamental principle of the Technology Acceptance Model (TAM), this study proposed a moderated mediation model to examine the mediating effect of perceived usefulness on the relationship between perceived ease of use and behavioral intention. Regarding facilitating conditions and perceived value as environmental and personal factors respectively, the moderating effects of facilitating conditions and perceived value on the aforementioned mediation relationship were explored. A total of 377 valid responses of Taiwan&rsquo;s mobile payment users were collected in an online survey. The empirical findings validated the mediating role of perceived usefulness. For moderating effects, both facilitating conditions and perceived value had a positive relationship with the indirect effect of perceived ease of use and behavioral intention through perceived usefulness. Practical implications and future research are then discussed.</p> <p>&nbsp;</p>