• Nuclear Engineering and Technology
• /
• v.54 no.11
• /
• pp.4013-4021
• /
• 2022

A kind of zirconium phosphate mesoporous coordination polymer Zr-EDTMPA was successfully synthesized and characterized using XRD, FTIR, TGA, EA, SEM-EDS, and N₂ sorption-desorption measurements. The prepared Zr-EDTMPA was first employed for the removal of Co(II) from an aqueous solution, and the effects of pH, contact time, temperature, initial Co(II) concentration, reusability, and sorption mechanism were systematically investigated. The results showed that the Zr-EDTMPA is a zirconium phosphate complex formed by the coordination of EDTMPA to Zr in a molar ratio of 1:1. The sorption of Co(II) by Zr-EDTMPA was a pH-dependent, spontaneous and endothermic process, which was better fitted to the pseudo-second-order kinetic model and Langmuir isotherm model. The Zr-EDTMPA was demonstrated to have excellent reusability and presented a high sorption capacity of 73.0 mg·g^-1 for Co(II) at pH 8.0. The sorption mechanism was mainly attributed to the strong coordination between cobalt and the untapped hydroxyl functional groups on Zr-EDTMPA, which was confirmed by XPS spectra. Therefore, as a candidate sorbent with high sorption capacity and excellent reusability, Zr-EDTMPA has a great potential for the removal of Co(II) from aqueous solutions.

• Journal of Industrial Convergence
• /
• v.21 no.6
• /
• pp.73-80
• /
• 2023

The purpose of this study was to identify the stress, social support, and happiness in undergraduate nursing students who experienced the COVID-19 pandemic, and to identify factors affecting happiness. The survey was conducted from December 18, 2022 to January 5, 2023. The subjects were 195 first and second grades nursing students attending two universities located in G city. Data were analyzed by t-test, ANOVA, Scheffe test, Games-Howell test, Pearson's correlation, and multiple regression. Statistically, happiness showed a significantly negative correlation stress(r=-.17, p=.017) and positive correlation with social support(r=.68, p<.001). Influencing factors on happiness were social support(β=.63, p<.001) and department satisfaction(β =.30, p<.001) accounting for 49.7% of the total change. In order to improve the happiness of nursing students based on the results of this study, strategies and programs that can increase social support and department satisfaction are needed.

• Journal of the Korea Convergence Society
• /
• v.13 no.1
• /
• pp.283-295
• /
• 2022

This study attempts to explore factors that influence the perception of importance of information security. Three possible exogenous variables including perceived certainty of punishment, perceived response cost, and acquiescense are suggested that are based on the protectiom motivation theory. As a result, we found followings. First, The perceived punishment certainty has a significant effect on the perceived importance of information security. Also, it influences a negative effect on acquiescence. Second, the response cost has a negative effect on the perceived importance of information security. In addition, the response cost positively effects on acquiescence. Finally, acquiescence negatively influences on the perceived importance of information security. The results show that, in order to increase the perceived importance of information security among employees, it is necessary to make them aware that a security violation can result in certain punishment. At the same time, organizations should also attempt to remove major obstacles accompanying security behaviors of employees. Finally, organizations encourage open communication relating to information security among employees.

• Korea Trade Review
• /
• v.43 no.2
• /
• pp.205-227
• /
• 2018

This study reviews strategic CSR, which recently has become a controversial topic, and examines the implications of strategic CSR activities on corporate performance. For this, three hypotheses were set. First we categorize CSR activities into economic, legal·ethical, philanthropic, and social innovation responsibility, and to verify if these CSR activities have positive influences on the performance of Chinese and Korean companies. Second, we explore the moderating effects of globalization between the CSR activities and corporate performance. In addition, CSR activities were separated into traditional and strategic in order, and to determine whether the strategic activities had a more positive influence on corporate performance than traditional CSR activities. For this, a total of 646 surveys (401 from China and 245 from Korea) were collectd from MBA students in China and Korea, and the results were comparatively analyzed.

• The Korean Journal of Franchise Management
• /
• v.9 no.4
• /
• pp.33-43
• /
• 2018

Purpose - In hotel industry, quality of leader-member exchange(LMX) relationship is very critical, because it impacts on the employee's work attitude and behaviors. Thus, this research examines the effect of LMX on employee loyalty in the context of hotel business and identifies mediating roles of work stressors, work role performance in the relationship between LMX and employee loyalty. This research suggests the guidelines for how hotel leaders should manage their employees and build employee loyalty that improve management and business performance. Research design, data, and methodology - This study tests the structural relationship between LMX, work stressors, work role performance, and employee loyalty. Work role performance divide into three sub-dimensions such as individual task proficiency, individual task adaptivity, and individual task proactivity. In order to examine the purposes of this research, research model and hypotheses were developed. All constructs were measured with multiple items developed and tested in the previous studies. The data were collected from 113 franchise hotel employees and were analyzed using SPSS 22.0 and SmartPLS 3 program. Result - The findings of this research are as follows. First, leader-member exchange(LMX) have significant positive impacts on work stressors, work role performance, and employee loyalty. Second, work stressors have significant negative impacts on work role performance and employee loyalty. Third, work role performance has significant positive impact on employee loyalty. Conclusions - The outcomes of this research indicate that hotel leaders should focus on the dyadic relationship with their employees how to improve employee productivity through LMX relationship. In turn, the quality of this relationship influences employees's work attitudes and behaviors. As a result of increasing job demands in hotel business which relies heavily on human resources, the hotel leader must find ways to prevent or reduce stressors and associated strains. If hotel employees perceive the high quality of LMX relationship, they improve their work role performance which influences loyalty. Therefore, the hotel leaders should develop monetary or non-monetary reward system for the employees and, make an efforts to have unique social exchange relationships with employees.

• The Korean Journal of Franchise Management
• /
• v.8 no.1
• /
• pp.31-41
• /
• 2017

Purpose - As the domestic coffee market is rapidly growing and competition is intensifying, coffee shops need to establish a marketing strategy that grasps the needs and desires of consumers in order to secure a competitive advantage in terms of survival. From this point of view, this study suggests what choice attributes consumers consider when visiting coffee shops, and analyzes the effect of customer choice attributes on franchise and private coffee shops using fsQCA. Research design, data, and methodology - In the present study, we tried to understand the effect of the combination of choice attribute on satisfaction by the type of coffee shop based on the complex system theory, while studying the existing coffee shop choice attribute focuses on the causal relationship. FsQCA is a complementary analytical method between quantitative and qualitative research, and is a method for effectively analyzing the complex combination of causal variables. Result - The results of the study are as follows. First, cleanliness was found to be the most important factor in determining coffee quality, which is the most important factor affecting customer satisfaction. Second, customers who prefer franchise coffee shops seem to be most concerned about atmosphere, menu, cleanliness and price. On the other hand, customers who prefer private coffee shops consider image the most important. Conclusions - The implications of this study are as follows. Overall, coffee shops should manage cleanliness basically regardless of the type of store, but they should manage the choice attributes differently depending on the type of coffee shop. Franchise coffee shops will be able to increase the level of store satisfaction by systematically managing the store atmosphere, menu, cleanliness, and price according to the manual using the advantages of the franchise system. On the other hand, unlike the franchise coffee shops, private coffee shops can operate autonomous stores, so customers can use various marketing mixes to enhance their store image.

• The Journal of the Convergence on Culture Technology
• /
• v.9 no.4
• /
• pp.85-93
• /
• 2023

The purpose of this study was to investigate the pre-service early childhood teachers' personality on their children's rights perception. The subjects of this study were 253 early childhood education majors in Seoul and Gyeonggi province. The statistical analysis of this study was analyzed using the SPSS V.22.0 program. The result of the study is summarized as follows. First, the result of the current study reveals that personality and perception of children's rights are correlated. Also, there was a statistically significant positive correlation between personality and perception of children's rights. Second, it was found that the 'social relationship' sub-factor in personality affected the pre-service early childhood teachers' perception of children's rights. Therefore, it is necessary to promote personal development in order to enhance pre-service early childhood teachers' perception of children's rights.

• Korean Journal of Social Welfare Studies
• /
• v.44 no.2
• /
• pp.359-385
• /
• 2013

The study looked into the effect of internet utilization (utilization frequency and utilization ability in internet) on the life satisfaction level for the elderly in depth. In order to verify the correlation of two variables, a mediating model structured by ego integrity was used which gave out the Seoul welfare panel data created by Seoul welfare foundation in 2010. The total sample size was a group of 1862 elders aged over 60. When it came to our research methods, structured equation analysis was applied to verify the mediating effect and theoretical background. The findings are as follows: First, elderly's utilization frequency in internet is not an influencing factor to life satisfaction and elderly's utilization ability in internet is an influencing factor to life satisfaction. Second, the level of social activity did function as partial mediator on relationship between elderly's utilization ability in internet and life satisfaction. This study indicates theoretical and practical interventions to promote elderly's utilization in internet.

• Journal of Korea Port Economic Association
• /
• v.39 no.3
• /
• pp.141-153
• /
• 2023

Recently, conflict management has emerged as a major issue. Among them, public conflicts that occur in the process of promotion public policies can have negative social effects, so it is very important to manage conflicts effectively. Therefore, this study aimed to examine the characteristics of public conflicts related to ports in order to lay the foundation for the smooth promotion of public policies related to ports. The significance of this study is that it collected and categorized conflict cases in the port sector through various channels to examine the characteristics of port-related conflicts more closely. The results of this study are summarized as follows. First, this study categorized port-related public conflicts by considering the characteristics of actors, life cycles, and issues, which confirmed that conflicts over ports have various issues. Second, we found that many port-related public conflicts have been resolved in a highly coercive manner. Third, it is necessary to explore non-coercive approaches to induce conflict resolution. Fourth, it is necessary to establish a dual system of proactive and reactive measures to manage port-related public conflicts.

• Advances in nano research
• /
• v.15 no.3
• /
• pp.215-224
• /
• 2023

Nonlinearity plays an important role in control systems and the application of design. For this reason, in addition to linear vibrations, nonlinear vibrations of the stepped nanobeam are also discussed in this manuscript. This study investigated the vibrations of stepped nanobeams according to Eringen's nonlocal elasticity theory. Eringen's nonlocal elasticity theory was used to capture the nanoscale effect. The nanoscale stepped Euler Bernoulli beam is considered. The equations of motion representing the motion of the beam are found by Hamilton's principle. The equations were subjected to nondimensionalization to make them independent of the dimensions and physical structure of the material. The equations of motion were found using the multi-time scale method, which is one of the approximate solution methods, perturbation methods. The first section of the series obtained from the perturbation solution represents a linear problem. The linear problem's natural frequencies are found for the simple-simple boundary condition. The second-order part of the perturbation solution is the nonlinear terms and is used as corrections to the linear problem. The system's amplitude and phase modulation equations are found in the results part of the problem. Nonlinear frequency-amplitude, and external frequency-amplitude relationships are discussed. The location of the step, the radius ratios of the steps, and the changes of the small-scale parameter of the theory were investigated and their effects on nonlinear vibrations under simple-simple boundary conditions were observed by making comparisons. The results are presented via tables and graphs. The current beam model can assist in designing and fabricating integrated such as nano-sensors and nano-actuators.