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서기정 ( Ki Jung Seo ) 한국정책학회 2012 한국정책학회 학술대회 Vol.2012 No.4
This paper examines the crowd-out effects of the three types of social welfare spending on each other: (1) cash assistance spending, (2) medical assistance spending, and (3) social services spending. In doing so, it employs a fixed-effects model and utilizes panel data covering 1980 to 2004 for 50 states. Empirical findings are intersting. Medical assistance spending has crowd-out effects on social services spending and vice versa. The size of crowd-out effect flowing from medical assistance spending to social services spending is quite comparable to the crowd-out effect size flowing from social services spending to medical assistance spending. Medical assistance spending has crowd-in effects on cash assistance spending and vice versa. The size of crowd-in effect flowing from medical assistance spending to cash assistance spending is three times as large as the crowd-in effect size flowing from cash assistance spending to medical assistance spending. Social services spending and cash assistance spending have neither crowd-out nor crowd-in effects on each other. These findings suggest that a recent continuing expansion of health care spending in state budgets has cut spending for people in need of non-health social services from state and local governments.
점용접과 접착제를 사용한 사각강관의 표면 기반 접착거동을 이용한 충격거동해석 관련 인자 연구
강병현(Byung-hyun Kang),문정은(Jung-eun Moon),서기정(Ki-jung Seo),최병호(Byoung-Ho Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Traditionally, many steel sheets of the automobile have been joined through the spot welding. However, recently, an adhesive is used together with spot welds to improve the static and dynamic properties of the joint. Tubular steel columns are very commonly used in the automobile because of their superior energy absorption capability, and the use of spot welds can be reduced by introducing adhesives without hurting required impact property. In this study, the impact simulation of tubular steel columns with spot welds and adhesives using surface based cohesive behavior was conducted considering the coefficient of friction (COF), cohesive characteristics and adhesive damage properties to improve the accuracy of simulation results.