Jilin Railway Vocational and Technology College

Jilin, China

Jilin Railway Vocational and Technology College

Jilin, China

Time filter

Source Type

Zhang Y.,Beihua University | Liu Y.,Jilin Railway Vocational and Technology College | Duan H.,Beihua University
Advanced Materials Research | Year: 2013

The principle, ideas, procedures and optimization problems of the filtering algorithm were presented in the article. First, the filtering algorithm procedures of aerial image based on stochastic resonance theory was introduced, then the curve of noise strength and peak signal to noise ratio (PSNR) was analyzed, a golden-section fast search algorithm was proposed and discussed as well to find out the maximum point of PSNR in the process of filtering. Experimental results indicate that the filtering method in this article is superior to other methods on high noise strength aerial image, and the stability and robustness are better than other methods. The multiples of filtering image's PSNR is 1.2~1.4 times than other methods. © (2013) Trans Tech Publications, Switzerland.


Yanchun H.,Jilin Railway Vocational and Technology College
Sensors and Transducers | Year: 2013

Wireless sensor network localization involves the dataset of physical space and signal space, and its layout accord with the characteristic of manifold. This paper uses the own characteristic of topological structure and signal space,striving to search a right modeling approach to realize the mapping between these two spaces, thus the usage of locality preserving canonical correlation analysis (LPCCA)is put forward to realize the manifold structure and localization. To further improve the accuracy of localization algorithm, through combining specific positioning problem as regression rather than dimensionality reduction to adapt new application, developed an original wireless sensor network localization algorithm LE-LPCCA (location estimation-LPCCA) which can reflect network topological structure information. © 2013 IFSA.


Wang K.,Jilin Railway Vocational and Technology College | Wang F.,Jilin Railway Vocational and Technology College
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2014

In order to further improve the accuracy of the short-term traffic flow prediction, a combination of short-term traffic flow prediction models has been proposed by analyzing the characteristics of grey model, genetic algorithm and support vector machine (SVM) model. First, the paper uses the grey model to accumulate the original traffic flow data and weaken the randomness of the traffic flow data sequence, then forecast through support vector machine (SVM) model based on genetic algorithm. Finally, using the regressive features of grey model to reduction of the forecast results, the final predicted value table is gotten. The model was verified based on the traffic flow data of the major road in Changchun and the experimental result shows that the proposed model is effective and feasible.


Zhang Y.-X.,Beihua University | Liu Y.,Jilin Railway Vocational and Technology College
Applied Mechanics and Materials | Year: 2014

Cloing and hypermutation of immune theory were used in optimization on particle swarm optimization (PSO), an immune particle swarm optimization (IPSO) algorithm was proposed, which overcome the problem of premature convergence on PSO. IPSO was used in BP Neural Network training to overcome slow convergence speed and easily getting into local dinky value of gradient descent algorithm. BP Neural Network trained by IPSO was used to fault diagnosis of power transformer, it has high accuracy after experimental verification and to meet the power transformer diagnosis engineering requirements. © (2014) Trans Tech Publications, Switzerland.


Yan G.,Jilin Railway Vocational and Technology College
Applied Mechanics and Materials | Year: 2014

According to the nonlinear dynamic mathematical model of the three-phase AC permanent magnet synchronous servo motor(AC-PMSM), the inner disturbance and outside disturbance can be observed with the extended state observe(ESO), and use it to offset the system. The result of simulation and experiment indicate the control system of PMSM has better dynamic and robust characters by using auto-disturbance rejection controller. © (2014) Trans Tech Publications, Switzerland.


Liu G.,Jilin Railway Vocational and Technology College | Xing X.,Jilin Railway Vocational and Technology College | Lu J.,Jilin Railway Vocational and Technology College | Li J.,Jilin University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

Because difference of the linear thermal expansion coefficient of ceramic and metal, when ceramic and metal is joined there is a mass of the residual stress in the joint, which leads to decrease the strength. The joining of ceramic and metal is attention subject. In this composition, ceramic ZrO2 and metallic Ti-6Al-4V alloy are jointed by using a amorphous Ti33Zr17Cu50 (at.%) solder. The microstructure and the properties of the joint are investigated. The results show that the microstructure and mechanical properties are significantly influenced by the brazing temperature, the heat time and the cooling rate. The brazing seam is composed of ZrO2/Cu2Ti4O+(Ti,Zr)2Cu/ TiO+Ti2O/ CuTi2+(Ti,Zr)2Cu/CuTi2/Ti-6Al-4V alloy. The shear strength of the joint decreases as the brazing temperature, the heat time the cooling rate increase. The maximum shear strength of the brazing joints reaches 165 MPa with the optimal technical parameters: The brazing temperature of 1173 K, the heat time of 10 min and the cooling rate of 5 K/min.


Gao G.,Jilin Agricultural Science and Technology College | Chen H.,Jilin Railway Vocational and Technology College
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010 | Year: 2010

ART-2 is a self-organized and unsupervised artificial neural network which can recognize complicated inputting patterns. This paper presents a new structure aiming to discard small amplitude information during classifying the data by Standard ART-2 network, especially the time series data. So, we proposed an improved structure based on standard ART-2. Finally, the problem of "discard small amplitude information" is successfully resolved by improved structure and a simulation is given to show the superiority. © 2010 IEEE.


Cui Y.-Y.,Jilin Railway Vocational and Technology College | Zhang Z.,Shanghai University
Academic Journal of Second Military Medical University | Year: 2011

Objective To analyze the topological properties of genomic-wide genetic interaction network in yeast. Methods The topological properties of genomic-wide genetic interaction network in yeast were calculated by the graph theory. Results A power law fit the degree distribution well in the genomic-wide genetic interaction network in yeast, with the exponent approaching 3. TheNode's degree followed awídc-taíl distribution, with the average degree being 87. Two thirds of the genes had genetic interaction via only one gene, and about one third of the genes had genetic interaction via only 2 genes. The average clustering coefficient was 0. 047. Conclusion The gene function in yeast is usually multiple and the functional interaction between genes is highly condensed.


Ma X.-Z.,Jilin Railway Vocational and Technology College
Computer, Intelligent Computing and Education Technology - Selected Peer Reviewed Papers From 2014 International Conference on Computer, Intelligent Computing and Education Technology, CICET 2014 | Year: 2014

In the contemporary economy, economic stability, systemic risk and economic security has been a hot research topic among economists. Based on the real economy and virtual economy system, a comparative analysis of the system based on the virtual economy demonstrates the basic operating rules and characteristics, proposed and demonstrated a "virtual economic stability of contemporary economic stability and security of the core areas of the national economy" theory proposition. The stability is the virtual economy, in fact, the study of risk for the system to provide economic support in theory, so as to guarantee national security surveillance. © 2014 Taylor & Francis Group.


Zhang Y.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Y.-X.,University of Chinese Academy of Sciences | Zhang Y.-X.,Beihua University | Liu Y.,Jilin Railway Vocational and Technology College | Ge W.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2010

Image Motion Compensation(IMC) has been widely used in aerospace cameras to improve the imaging quality and the resolution of cameras. In this paper, the principle of IMC is analyzed and several kinds of IMC technologies used at home and abroad are introduced, such as optical IMC, mechanical IMC, integrate IMC, digital IMC. Then some common methods including parallel-slit method, scan and correlation method, heterodyne method, optical path difference method, direct calculation method are given to obtain an important parameter, speed-altitude ratio. Finally, this paper discusses the developing trend for digital IMC, presents the digital, real-time and miniaturization of measuring speed-altitude ratio and brings forward a new idea for measuring speed-altitude ratio by combining an array CCD with a high-performance microprocessor.

Loading Jilin Railway Vocational and Technology College collaborators
Loading Jilin Railway Vocational and Technology College collaborators