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J. N. Sur(徐柱魯),Y. T. Seo(徐英兌) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.1
A sliding mode controller for depth control of autonomous underwater vehicles(AUV), which have highly nonlinear terms, uncertainties and disturbances is designed. First, Sliding surface coefficients of the controller based on the linearlized equation is optimized by numerical simulation. Second, the controller is applied to nonlinear equation and evaluated for system response. Finally, an experimental verification was attempted on the NPS protype vehicle with nonlinear terms and disturbances.
나혜령,이은주,장동순,서영태 한국산업안전학회 1995 한국안전학회지 Vol.10 No.3
A series of parametric calculations have been performed in order to investigate the short-term and short-range plume and puff behavior of toxic gaseous and solid pollutant dispersion in an open atmosphere. The simulation is made by the use of the computer program developed by this laboratory, in which a control-volume based finite-difference method is used together with the SIMPLEC algorithm for the resolution of the pressure-velocity coupling appeared in Navier-Stokes equation. The Reynolds stresses are solved by the standard two-equation k-ε model modified for buoyancy together with the RNG(Renormalization Group) k-ε model. The major parameters considered in this calculation are pollutant gas density and temperature, the relative velocity of pollutants to that of the surrounding atmospheric air, and particulate size and density together with the height released. The flow field is typically characterized by the formation of a strong recirculation region for the case of the low density gases such as CH₄ and air due to the strong buoyancy, while the flow is simply declining pattern toward the downstream ground for the case of heavy molecule like the CH₂Cl₂ and CCl₄, even for the high temperature, 200℃. The effect of gas temperature and velocity on the flow field together with the particle trajectory are presented and discussed in detail. In general, the results are physically acceptable and consistent.