Abstract-The development of virtual simulation and BIM in railway industry has increasingly become a trend. The method of 3D digital modeling is important in design and construction, but the current study of track structure modeling is not accurate enough, and the species are not comprehensive. This thesis was based on the re-development of AutoCAD via VBA, Visual windows was designed for railway track components such as fastening , sleeper, and railway switch., and this paper discusses the method of parametric drawing design and establishing three-dimensional library via VBA language for track Structure. At the same time, custom menu is added on AutoCAD drawing window for connecting with programming, which realizes the automatic modeling of various types of track structure based on VBA, and Visual windows are friendly, three dimensional modeling of track components are simple and accurate. It has certain directive significance to building 3d model library and stronger practical value, which conforms to the development trend of railway industry.
This paper explores issues of electronic commerce as a key enabler to promote trade between buyers and sellers. The broker is processed to match buyers and sellers, which is significant in prompting the transactions between the two sides. This paper proposes an agent-based framework for matching buyers and sellers and uses the multi-objective optimization model to match sellers and buyers. The framework is processed in three layers: the interface layer, the matching layer and the database layer. The interface layer consists of buyer agents, seller agents and a broker agent. The matching layer is mainly to find the appropriate sellers to buyers. Based on the framework, a prototype system has been designed to illustrate the effectiveness of the approach.
In current complex network environment, various kinds of attacks are mixed together forming the attack group. The diversity of the attack group leads to diverse attack signatures, which cannot be constrained by uniform conditions. Based on mixed attack signatures estimation model, the paper proposes a detection method for mixed and diverse attack groups. The paper classifies the different attacks in the mixed and diverse attack groups by use of attack constraint classification methods, builds invasion recognition particle tree, and detects mixed diverse attack groups in complex network environment according to error estimation. Experimental results show that the algorithm can effectively improve the accuracy of detection in complex network environment. atures;
The SiC ceramic membrane supports by using four different processes were prepared by extrusion molding process. Shape and distribution of pores in SiC ceramic membrane supports were observed by SEM, Meanwhile the O-ring strength was measured. By analyzing the relationship between pores’ shape, distribution and O-rings strength, the optimal data of apparent porosity and the optimal pores’ shape and distribution was obtained. By means ofusing similar particle sizes, particles modification, controlling drying rate of the green body and controlling the contents of glass phase in neck part between SiC particles formed at the high temperature, the SiC ceramic membrane supports with the O-ring strength greater than 20 MPa were prepared.
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