Applied Mechanics and Materials Vols. 496-500

Abstract: This article illustrates with the criterion of the common shafting accessorys design, using the Visual C++ and the Access to primarily set up the parameters and coefficients database of the shafting accessories, which are mostly the gear and the conical roller gearing. Setting up its function as demanding, appending and deletion, etc. Making the data processing for mechanical design and other fields conveniently. Through this research and exploitation, It can account for setting up the parameters and coefficients database of the standard accessory is necessary and really count for engineering.

Abstract: With the development of vehicle maintenance and repair training teaching or training, how to use of equipment and instruments reasonably, improving teaching efficiency and effectiveness become important for the professional educators. In order to reduce the loss of training equipment, improve the quality of teaching and training, the actual fusion technology has become a research direction. Nakedness fusion technology is the virtual simulation and physical teaching organic combination, provides a good reference for the teaching and training. How to develop and use the actual fusion technology is emphatically expounded in this paper.

Abstract: The classical Apriori algorithm has many drawbacks. This author proposed an improved association rules algorithm for Web-based Chinese short text, which combines Apriori algorithm with matrix. It proves that this algorithm has higher performance according to the results of case studies and simulation experiments.

Abstract: Based on ICM method, topological optimization model is established to minimize the weight with different constraints. The model is solved by constraint integrated method. The impact of different filter functions on continuum structural topology optimization efficiency is studied by numerical examples. The results show that: The application of nonlinear filter function can speed up the convergence, reduce the number of iterations, get a good stability in the continuum structural topology optimization.

Abstract: With improvement of the level of modernization and mechanization of railway infrastructure maintenance, Railway large maintenance machinery (RLMM) is considered to be one of the main equipment. We have accumulated large amounts of RLMM construction data. How to mine valuable information from these data has become an important research subject. The C4.5 algorithm of decision tree is a useful method of data mining and classification. The paper solves evaluation of RLMM construction problem based on the C4.5 algorithm. By means of extracting the attribute with maximum gain ratio as the root node of the decision tree from training sample data, the evaluation decision tree was constructed. The decision tree modeling of evaluation of RLMM construction was gained by the post-pruning approach. The experimental results and analysis show that this model has high precision and credibility.

Abstract: To solve the problem of "reliablity", calculation scope and the high thresholds in the operation of the 3D graphics automatic calculation quantity system in the practical use, "read schemata" graphics manual calculation quantity technology is analyzed. This technology has the features of direct visualization, clear presentation, no requirement for memory in work, revisability, meeting cost engineers work habits, low threshold in operation, wide application scope, easy proofreading and so on. The main function of graphics manual counting system is described with "reading schema". The functions of the drawing display and the manual calculation area are given. The experimental results show that the method is effective, feasible and superior to other 3D graphics quantity calculation system and can be applied in the quantity calculation of various professional engineering.

Abstract: Query evaluation and query semantics in the XML keyword query, has an important role, which directly affect the performance of XML query. This paper proposes a fast approach for SLCA in keyword query over XML document,which can judge the information of relevant nodes by means of self-definition to document nods type.This method can solve the problems of no significance of node information query results of the XKSearch algorithm, and compared with XSeek algorithm, it has high efficiency in the query time consumed for the returned results. Experiments show that this method is more efficient in query time and quality of keywords query.

Abstract: Virtual teams have been adopted by organizations to gain competitive advantages in this global economy. It was extremely important of modeling for virtual teams building in collaborative process planning. Based on the flow analysis of virtual teams building in collaborative process planning, the relationship of actual virtual teams building and the elements of GSPN were studied. Finally, the modeling method generalized stochastic Petri nets (GSPN) - based was proposed and the model can excellently describe the flow of virtual teams building in collaborative process planning.

Abstract: Unexpected disruptions such as aircraft failure and airport closure often make the original flight schedule cannot operate regularly and destroy the crew duties. This paper proposed a constraint programming model to solve the crew recovery problem. The total recovery cost was taken as the objective function, temporal-spacial requirements, deadheading and time legalities were considered as constraints. An algorithm based on sequential, least slack and greedy thoughts was designed to search the solution space. Finally, an example was test to indicated feasibility of the proposed model and algorithm.

Abstract: To reduce the hardware cost of traditional multichannel array or interferometer, a direction finding method using rotated long baseline interferometer (RLBI) has been developed. To overcome the initialization problem, a multiple hypothesis Gauss-Newton (MHGN) algorithm is proposed. It first chooses multiple initial pairs from a pair of PD measurements and then applies each value to the GN algorithm and meanwhile obtains a cost for this initial value. Finally, the ultimate estimate is then picked with the minimum cost. Simulation shows that the proposed method can approach to the Cramer-Rao lower bound (CRLB).