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For rarefied gas flow regimes, physical phenomena such as velocity slip and temperature jump occur on the solid body surface. To predict these phenomena accurately, either the Navier-Stokes solver with a slip boundary condition or the direct simulation Monte Carlo method should be used. In the present study, flow simulations of a wedge were conducted in Mach-10 flow of argon gas for several different flow regimes using a two-dimensional Navier-Stokes solver with the Maxwell slip boundary condition. The results of the simulations were compared with those of the direct simulation Monte Carlo method to assess the present method. It was found that the values of the velocity slip and the temperature jump predicted increase as the Knudsen number increases. Also, the results are comparatively reasonable up to the Knudsen number of 0.05.
In type-I multiferroics, where ferroelectricity and magnetism arise from different origins, the explicit measurement of magnetoelectric effect is commonly prohibited due to the weak magnetoelectric coupling. From our investigation of magnetic and dielectric properties in a perovskite PbFe0.5- Ti0.25W0.25O3, we have directly demonstrated magnetic-field-driven change of dielectric constant in a highly non-linear fashion. Our result offers a potential utilization of magnetoelectric functionality in type-I multiferroics.
Dynamically changing customer demands request manufacturers to make quality products with cheaper prices and shorter delivery. To survive in the global market, the manufacturing industry of today needs to be equipped with advanced technologies including IT as well as substantial infrastructure. Under this situation, we found that collaboration is the right answer for manufacturers to survive by strengthening relations between companies instead of competing against each other. For facilitating collaboration among Korean SMEs, we performed i-Manufacturing project from 2005. Through this project, we applied IT into the conventional manufacturing industry by developing business models and collaboration systems. In this paper, we introduce collaborative production management model and system including shop floor control.