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Articles by Wen Wen
Total Records ( 2 ) for Wen Wen
  Yalin Miao , Xin Ji , Wei Wei and Wen Wen
  With the rapid development of economic and the increasingly urban populations, the impacts of humans’ activities on the environment quality of the city is prominently increased. In this study, for the spatial distribution and concentration of the sampling points of heavy metal elements in the city, evaluate soil heavy metal pollution by using Single-factor index method, Nemero index method and cumulative index method, determine the main causes of pollution in each region by the cluster analysis method and the principal component analysis method. Finally, we get the position coordinates of pollution sources in the city by building and solving the three dimensional partial differential model of migration of heavy metal pollutants in soil environment system. In order to provide better research for the evolution model of the urban geology environment, we collected more information and evaluate the advantages and disadvantages of the models.
  Ruichu Cai , Zhifeng Hao , Xiaowei Yang and Wen Wen
  Gene selection, a significant preprocessing of the discriminant analysis of microarray data, is to select the most informative genes from the whole gene set. In this paper, an efficient mutual information-based gene selection algorithm (MIGS) is proposed, in which genes are sequentially forward selected according to an approximate measure of the mutual information between the class and the selected genes. In order to improve the efficiency of the MIGS, an effective pruning strategy is introduced in the selection procedure as well as the employment of Parzen window density estimation technique. Extensive experiments are conducted on three public gene expression datasets and the experimental results confirm the efficiency and effectiveness of the algorithm. Though the computational cost of MIGS-Pruning increases with the number of selected genes, it still has good performance applied in the microarray problems.
 
 
 
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