Fujian Communications Technology College

Fuzhou, China

Fujian Communications Technology College

Fuzhou, China
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Xu T.,Fujian Communications Technology College | Gao L.-J.,Shanghai JiaoTong University | Jing P.,Shanghai JiaoTong University | Chen D.-Q.,Fuzhou University
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

Resident trip mode choice is a complex nonlinear problem which is affected by many factors. This paper models the resident trip mode with the support vector machine (SVM) method. It uses the classification accuracy as fitness function in the sense of cross validation and then adopts the particle swarm optimization (PSO) algorithm to select parameters. The choice randomness of specifying the parameters are avoided and the workload of the parameter selection are reduced. The empirical studies indicate that the PSO based parameters optimization in SVM is feasible. Compared with the BP neural network model, the SVM model achieves a better prediction performance for resident trip mode choice. The prediction accuracy of the SVM model is improved by 5% to BP neural network model. The SVM model obtains the forecasting accuracy rate of 86.20% to the model setting and 82. 31% to the test samples. The empirical results show that the model can be used for resident trip mode forecasting and provides a practical guidance to urban traffic planning and travel demand forecasting.


Wang Q.-X.,China Communications Construction Company Ltd. | Xu T.,Fujian Communications Technology College | Wu P.-Z.,Fujian Motor Industry Group Co.
Proceedings of 2011 IEEE International Conference on Vehicular Electronics and Safety, ICVES 2011 | Year: 2011

Engine anti-theft system is not only flexible and convenient but also high-performance, high-efficient and high-security. Based on the identity authentication principle of engine anti-theft system, with the AES encryption algorithm theory, this paper proposes the AES encryption methods and steps which are appropriate for the identity authentication of engine anti-theft system. It also designs the experimental program and obtains good results. © 2011 IEEE.


Yan W.,Fuzhou University | Yan W.,Fujian Communications Technology College | Fu G.,Fuzhou University | Fu G.,Fujian Communications Technology College | And 2 more authors.
Metal Science and Heat Treatment | Year: 2012

The process of dynamic recrystallization of aluminum alloy 1235 upon hot compression is studied. Methods of nonlinear regression analysis are used to obtain an equation describing the kinetics of this process. The equation matches experiment with correlation factor 0.94. © 2012 Springer Science+Business Media, Inc.


Yan W.-D.,Fuzhou University | Yan W.-D.,Fujian Communications Technology College | Fu G.-S.,Fuzhou University | Fu G.-S.,Fujian Communications Technology College | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Effect of oxide inclusion on dynamic recrystallization behavior of 1235 aluminum alloy were investigated by hot compression deformation tests on a Gleeble-1500 simulator and a dynamic recrystallization kinetics model was established. Results show that dynamic recrystallization occurred in 1235 aluminum alloy treated by different purification processes during hot deformation. The predicted results of dynamicaly recrystallized volume fraction by the model agrees well with the measured ones. At the same condition of deformation, the process of dynamic recrystallization occurs more slowly in the alloy with less impurities. Tiny inclusions inhibite the growth of recrystallized grains. As a result, the recrystallization grains are smaller.


Liu Y.,Fuzhou University | Tong X.,Fujian Communications Technology College
Advances in Intelligent and Soft Computing | Year: 2010

A reasonable encoding of component parts of product is the basis of implementing informationization for hoisting machinery enterprise. Aimed at the inefficiency of the current encoding system of hoisting machinery, a new encoding method with both classification-code and identification-code based PDM is presented in this paper. And an encoding system based on Client/Server pattern was developed. The feasibility and efficiency of this encoding system is proved in the production. © Springer-Verlag Berlin Heidelberg 2010.


Yang K.,Fuzhou University | Yang K.,Fujian Communications Technology College | Wu Y.,Fujian Communications Technology College | Chen W.,Fuzhou University | Chen W.,Fujian University of Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

Three-dimensional finite element simulation was carried out for analyzing the severe plastic deformation behavior during constrained groove pressing. The load variations and equivalent strain distributions were obtained. The results show that the required load for pressing during different passes is identical. The required load for groove pressing varies with increasing the displacement can be classified into three phases: rapid increase, slowly increase, another rapid increase. Whereas the required load for flatten pressing exhibits four phases: stabilizing, rapid increase, another stabilizing, and another rapid increase. The equivalent strain distributions are homogeneous along Y and Z axis but inhomogeneous along X axis. It is shown that the equivalent strain distribution along X axis can be classified into the lower regions located at both ends and the periodic variation region located at intermediate section. The different stages presented in the load versus displacement curves and the inhomogeneous distributions of equivalent strain are associated with deformation behavior.


Yan W.,Fuzhou University | Yan W.,Fujian Communications Technology College | Fu G.,Fuzhou University | Fu G.,Fujian Communications Technology College | And 3 more authors.
Advanced Materials Research | Year: 2011

Texutre evolution of 1235 aluminum alloy deformed at different strain rates was studied by dynamic thermal-simulated technology with the aid of some modern analytical and testing technique called election backscatter diffraction (EBSD). The results showed that the effect of strain rate on grain boundary and deformation texture of 1235 aluminum alloy was obvious. At deformation temperature for 400°C and distortion for 50%, the value of the maximum density level came to the minimum by 11.489 at the strain rate for 0.01s -1. The texture was weaker for the grains were less likely to rotate. The relative volume of textures increased as the strain rate increasing. The relative volume of textures was merely 1.95% at strain rate for 0.01s -1 but ascended to 5.4% at strain rate for 50s-1. © (2011) Trans Tech Publications, Switzerland.


Fu G.,Fuzhou University | Fu G.,Fujian Communications Technology College | Yan W.,Fuzhou University | Yan W.,Fujian Communications Technology College | And 4 more authors.
Advanced Materials Research | Year: 2012

Based on the theory of processing map proposed by PRASAD, the power dissipation maps, the hot deformation instability maps and the hot processing maps of 1235 Al alloys treated by different methods of purification were built, and the effects of purification and deformation conditions at elevated-temperature on hot workability of 1235 Al alloy were analyzed. At the same time the optimum processing region and flow instability region were determined. The results show that the hot processing map of 1235 Al alloy has two instability zones in the temperature range of 300-500°C and in the strain rate ranging from 0.01s -1 to 10.0s -1 up to a true strain of 0.7, that is, one zone lying in the range of lower temperature and higher strain rate, the other zone in the range of higher temperature and mid strain rate. The purification effect has significant impact on hot workability of the alloy. It is found that the optimum processing region of 1235 Al alloy treated by high-efficient purification treatment is present in the range of higher temperature and lower strain rate zone, and its power dissipation efficiency is about 46%; while the optimum processing region of 1235 Al alloys treated by conventional refining treatment is present in the range of mid-temperature and lower strain rate zone or in the range of higher temperature and strain rate zone, and its power dissipation efficiency is about 23-29%. The results of observation of the deformation microstructure of 1235 Al alloy are in accordance with that of the hot processing maps of the alloy, thus showing that the calculation results of the hot processing maps are reliable.


Yang K.-H.,Fujian Communications Technology College | Yang K.-H.,Fuzhou University | Peng K.-P.,Fuzhou University | Chen W.-Z.,Fuzhou University | Chen W.-Z.,Fujian University of Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

Microstructure of commercial 5052 aluminum alloy subjected to repetitive groove pressing, using a novel self-designed groove pressing die, was investigated by optical microscopy and transmission electron microscopy. The results show that grain refinement has been achieved using constrained groove pressing (CGP) or unconstrained groove pressing (UGP). The average grain size gets decreased with the increasing of the number of pressing. But the microstructure of the samples processed by different groove pressing methods exhibits different characteristics. The samples processed by CGP exhibit equiaxed ultra-fine grains and subgrains with high dislocation density inside. The microstructure of the samples subjected to UGP can be characterized as elongated grains and a uniform distribution of dense dislocation microbands which have misorientation from one region to another. Compared with UGP, CGP is more beneficial to grain refinement and formation of equiaxed grains.


Wang M.,Fujian Communications Technology College
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2011

Cylinder gearbox is widely used in various types of machinery products and equipments, so it has an important economic significance for the research on improving its capacity, extending its service life and reducing its size and mass. The MATLAB arithmetic is used to solve the optimum issue in this paper. The result shows that the mechanical design efficiency can be improved by using MATLAB, which not only the algorithm is reliable and effective, but also the program designed is simple. This method can also be used to solve optimum design issues of the other mechanism.

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