PURPOSE
The purpose of this study was to investigate the influences of depression, stress, and self-efficacy on the addiction to cell phone use among university students.
METHODS
Data were collected through questionnaires from 563 students and analyzed by applying descriptive statistics, t-test, chi-square test, and stepwise multiple regression with SPSS/WIN 16.0.
RESULTS
The proportion of depressed subjects was 52.6%. The addictive group scored higher than the non-addictive group in depression rate and stress, but scored lower in self-efficacy. Out of the subjects, 32.9% were found to be addictive users, 31.3% at potential risk, and 1.6% at high risk. Significant variables influencing addictive users were stress, self-efficacy, and the user's general characteristics including monthly spending money, sex, the hours of daily use, and the main method of use.
CONCLUSION
It is concluded that such variables should be carefully considered in interventions for university students addicted to cell phone use.

PURPOSE
The purpose of this study was to examine internet addiction, self-esteem and loneliness in adolescents.
METHOD
Subjects were middle and high school students in Daegu (N=486). Self-rating questionnaire included demographic data, the Korean version of Young internet addiction scale, self-rating self-esteem and loneliness scale. We have received the consent from teachers and students.
RESULTS
Among the subjects, 34% was addicted and internet addiction was significantly different according to gender, record at school, economic status, attitude of mother, father, teacher and friend about internet. There were significant differences in self-esteem and loneliness according to internet addiction. Internet addiction, self-esteem and loneliness were related to each other.
CONCLUSION
These results indicate that internet addiction would be changed according to gender, record at school, economic status, attitude of mother, father, teacher and friend about internet. Therefore, further studies are needed to generalize these results and examine widely the related variables of internet addiction.