1. Electron aspects
2. A relationship between R&D expenditure and ownership structure and firm value;?????? ???, 2007;Korean International Accounting Review,2007
3. The value-relevance of R&D;???�???;Korean International Accounting Review,2014
4. R&D investment and uncertainty;??????? ???;Korean Journal of Financial Engineering,2007
5. A study on the low technology trap of small-medium sized firms: in consideration of the relationship between technological capability and R&D investment for innovation;????? ???, 2008;Korean Small Business Review,2008