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임의로 움직이는 물체 주위의 유동 해석을 위한 피드백 강제 외력을 이용한 가상경계방법
신수재(S.J. Shin),황위희(W.-X Huang),성형진(H.J. Sung) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
We present an improved immersed boundary method for computing incompressible viscous flow around an arbitrarily moving body on a fixed computational grid. The main idea is to incorporate feedback forcing scheme of virtual boundary method with Peskin’s regularized delta function approach in order to use large CFL number and transfer quantities between Eulerian and Lagrangian domain effectively. From the analysis of stability limits and effects of feedback forcing gains, optimum regions of the feedback forcing are suggested.
In Search of the Optimum Tariffs Under Third-Degree Price Discrimination
( C. W. Yang ),( S. N. Sohng ),( B. N. Huang ),( Cindy H. P. Peng ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2006 Journal of Economic Integration Vol.21 No.1
Tariff literature on third-degree price discrimination remains only lightly explored. The purpose of the paper is to investigate whether there exist optimum tariffs in the presence of different demand elasticities. We explore (i) the case of optimum uniform ad valorem tariff, and (ii) the case of optimum discriminatory ad valorem tariffs. A two-stage optimization approach is used: profit is maximized for a foreign firm in the first stage and importing country`s optimum tariff rates are determined under maximization of welfare (sum of consumer surplus and tariff revenue). The result indicates that the optimum tariffs may not exist even with a set of well-behaved linear demand functions. Consequently, computer simulations are needed with cost and demand parameters to ensure better welfare position for home country.