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Ro Ki-Deok,Kang Myeong-Hun,Kong Tae-Hee The Korean Society of Marine Engineering 2005 한국마린엔지니어링학회지 Vol.29 No.7
The velocity and pressure fields of a ship's Weis-Fogh type propulsion mechanism are studied in this paper using an advanced vortex method. The wing (NACA0010 airfoil) and channel are approximated by source and vortex panels. and free vortices are introduced away from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from an integral, based on the instantaneous velocity and vorticity distributions in the flow field. Two-dimensional unsteady viscous flow calculations of this propulsion mechanism are shown. and the calculated results agree qualitatively with the measured thrust and drag due to un-modeled large fluctuations in the measured data.
김태성,Mi Hwa Ko,Myeong-Hee Ro 한국수학교육학회 2004 純粹 및 應用數學 Vol.11 No.2
Let fXtg be an m-dimensional linear process of the form Xt = 1Xj=0 AjZt¡j ; where fZtg is a sequence of stationary m-dimensional negatively associated random vectors with EZt = O and EjjZtjj2 < 1. In this paper we prove the central limit theorems for multivariate linear processes generated by negatively associated random vectors.