[1] Is There a Crowding-out Effect Between School Expenditure & Mother's Childcare Time?,Economics of Education Review, vol 20. no 1. 2001


[2]The Effect of IT Job-training on Employment and Wage Premium: Evidence from Korea, Panel Data, Developing Economics, Vol 41 No 4, 2003. December


[3] Home Production Function & The Productivity Effect of Air Pollution, Applied Economic Letters, Vol 14 issue 5, 2007


[4] Does sample selection bias affect the effect of family background on the returns to schooling?: Evidence from Korea, Applied Economics, vol 43 issue 8, 2011


[5] The income penalty of vertical and horizontal education-job mismatches in the Korean youth labor market: a quintile regression approach, Hitotsubashi Journal of Economics, vol 57 no 1, (with Seung chan Ahn, Ji-hye Kim), 2016

[6] Does skill Mismatches Create a Wage Penalty? Alternative Estimates for Korea, Asian Economic Journal 30. vol 3, 2016 (with Seung-jun Park) 


[7] Which country uses public social expenditures efficiency among OECD countries?, Applied Economics Letters, forthcoming (with Tae-young Kim)

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