A Model for Analyzing Churn Effect in Saturated Markets. - Sang-Gun Lee; Changsoo Kim; Changgyu Yang; Ming Yu (Ind. Manag. Data Syst., 2011)

Entry barrier's difference between ICT and non-ICT industries. - Changgyu Yang; Sang-Gun Lee; Jaebeom Lee (Ind. Manag. Data Syst., 2013)

ICT service providers strategies and customer migration. - Sang-Gun Lee; Silvana Trimi; Changgyu Yang (Ind. Manag. Data Syst., 2014)

ICT product diffusion in US and Korean markets. - Sang-Gun Lee; Changgyu Yang; Eui-Bang Lee (Ind. Manag. Data Syst., 2015)

Effects of telecom service providers' strategic investments on business performance: A comparative study of US-Korea. - Changgyu Yang; Silvana Trimi; Sang-Gun Lee (Ind. Manag. Data Syst., 2016)

A study on the antecedents of healthcare information protection intention. - Changgyu Yang; Hee-Jun Lee (Inf. Syst. Frontiers, 2016)

A Survival Analysis of Business Insolvency in ICT and Automobile Industries. - Changgyu Yang; Silvana Trimi; Sang-Gun Lee; Joon-Sun Yang (Int. J. Inf. Technol. Decis. Mak., 2017)

The influences of advertisement attitude and brand attitude on purchase intention of smartphone advertising. - Eui-Bang Lee; Sang-Gun Lee; Changgyu Yang (Ind. Manag. Data Syst., 2017)

Perceived Usefulness Factors of Online Reviews: A Study of Amazon.com. - Sang-Gun Lee; Silvana Trimi; Changgyu Yang (J. Comput. Inf. Syst., 2018)

A study on the changes in the ICT industry after the COVID-19 pandemic. - Changgyu Yang (Ind. Manag. Data Syst., 2023)