Doo-Heum Park

Characteristics of Excessive Cellular Phone Use in Korean Adolescents

Jaehak Yu, Seung-Ho Ryu, Jee Hyun Ha, 2008, Cyberpsychology Behav. Soc. Netw..

Usefulness of Young's Internet Addiction Test for clinical populations

Jaehak Yu, Seung-Ho Ryu, Jee Hyun Ha, 2013, Nordic journal of psychiatry.

Correlation between the Severity of Obstructive Sleep Apnea and Heart Rate Variability Indices

Jaehak Yu, Seung-Ho Ryu, Eui-Joong Kim, 2008, Journal of Korean medical science.

The Effect of Aging and Severity of Sleep Apnea on Heart Rate Variability Indices in Obstructive Sleep Apnea Syndrome

Jaehak Yu, Seung-Ho Ryu, Jee Hyun Ha, 2012, Psychiatry investigation.