Objectives The purpose of this study was to investigate the role of self-esteem as a moderator of the factors influencing suicidality among middle-schoolers. Methods Moderated multiple regression analysis was applied to assess the influence of happiness, depression, and hostility on suicidality and to determine the degree to which self-esteem served as a moderator of those relationships. Data were collected from 268 students at a middle school in Busan, Korea, using a self-administered structured questionnaire. Results Happiness, depression, and hostility had significant direct effects on suicidality. Self-esteem showed no direct effect, but had a significant moderating effect on the relationship between hostility and suicidal behavior. Conclusions These results suggest that various interventions, such as counseling programs, should be designed to alleviate hostility and depression and to enhance happiness and self-esteem among early adolescents.

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The objective of this study is to grasp effects of role-conflict and role-ambiguity on team performances in hospital employees and to verify the mediating effects of relationship conflict and task conflict on the relationships among the variables. Methods: In order to achieve research purposes, an empirical study model was designed to test the cause-and-effect relationship between team performances and conflicts among the members through earlier studies. The subjects were 280 employees of 9 hospitals located in Busan and the survey was conducted by self-administered questionnaire. Results: The role ambiguity was the greatest in team performance, the task conflict in sequence and the relationship conflict in order. In terms of direct effect, the task conflict was the biggest variable. However, the role ambiguity which has both direct and indirect effects was verified as the most important variable among variables in study model. Conclusions: In conclusion, the role ambiguity in total effect and the task conflict in direct effect are the most precious variable. Therefore, it is necessary to develop the management method to effectively manage the role ambiguity and the task conflict among the different conflicts in organization.

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