ABSTRACT
People's dependence on technology in the digital environment has increasingly become the focus of academic and social attention. Social media, in particular, with the functions of connecting with others and maintaining interactions, has become an inseparable part of people's lives. Although the formation of problematic use of social media has been extensively discussed by scholars, it is mainly confined to the individual level and lacks a macro perspective from the external environment. This study draws on the perspective of institutional theory and introduces copresence as a mediating role, aiming to investigate the influence mechanism of social environmental forces on individuals' problematic use of social media. An online survey (N = 462) was conducted to collect data and test the research model. Our data were analyzed using the structural equation modeling (SEM) approach. Results show that social environmental forces exert an impact on problematic use of social media through the sense of copresence, and only mimetic force can directly affect behavior outcomes while the other two forces can not. Besides, social environmental forces have a relationship with people's sense of copresence while using social media. Among them, mimetic force and normative force positively correlate with copresence while coercive force is negatively related to copresence. Furthermore, copresence is found to influence problematic use of social media positively. Practical and theoretical implications are discussed.
ABSTRACT
Previous literature has demonstrated that ethical leadership could predict employees' voice behavior. However, it's not clear how to heighten these positive effects of ethical leadership on employees' voice behavior. Building on the AET and moral disengagement studies, we developed an integrated model. A three-wave field study (N = 232) investigated the relationship between ethical leadership and voice behavior by focusing on the mediating role of employees' affective commitment and the moderating role of employees' moral disengagement. Our matched data analysis results indicated that: (1) employees' affective commitment partly mediated the relationship between ethical leadership and employees' voice behavior. In addition, employees' moral disengagement moderated (2) the effect of ethical leadership on employees' affective commitment and (3) the effect of employees' affective commitment on voice behavior, similarly, (4) the indirect effect of ethical leadership on employees' voice behavior via employees' affective commitment. Theoretical and practical implications of these results are discussed.
ABSTRACT
Porous structured regenerated cellulose films were oxidized by periodate oxidation to obtain 2,3-dialdehyde cellulose (DARC) films, which were then reacted with collagen to obtain DARC/Col composite films. The subsequent FT-IR spectra indicated that collagen was immobilized on the DARC matrix via the Schiff base reaction between NH2 in collagen and CHO in DARC backbone. Scanning electron microscopy revealed that DARC/Col exhibited a refined 3D network structure and its porosity and pore size decreased with increasing of collagen concentration. The composite films demonstrated a good equilibrium-swelling ratio, air permeability and water retention properties. The composite films also showed excellent mechanical properties, which was vital for practical application. Finally, the cytotoxicity of the composite film was evaluated using NIH3T3 mice fibroblast cells, the results revealed that DARC/Col composite films have good biocompatibility for use as scaffold material in tissue engineering.