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基于拟合的二维正态云模型 被引量:2
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作者 赵志强 缑锦 《计算机工程与设计》 CSCD 北大核心 2009年第20期4722-4726,共5页
分析了现有的正向/逆向云生成器实现算法的不足之处,并在此基础上提出了基于拟合思想的正向/逆向云生成算法。通过将概念空间划分为几个子空间,然后再在各子空间上使用正向/逆向正态隶属云生成算法来拟合整个概念空间上问题的描述。在... 分析了现有的正向/逆向云生成器实现算法的不足之处,并在此基础上提出了基于拟合思想的正向/逆向云生成算法。通过将概念空间划分为几个子空间,然后再在各子空间上使用正向/逆向正态隶属云生成算法来拟合整个概念空间上问题的描述。在拟合过程中,子空间的划分数目是影响拟合效果的主要因素。通过一系列实验分析就子空间的划分数目给出了一个建议数目。最后,实例分析和比较结果表明了该算法的可行性和效率。 展开更多
关键词 不确定性 隶属云 二维正态云 拟合云 转换模型
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Proteomic Comparison of Two-Dimensional Gel Electrophoresis Profiles from Human Lung Squamous Carcinoma and Normal Bronchial Epithelial Tissues 被引量:16
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作者 CuiLi XianquanZhan +9 位作者 MaoyuLi XiaoyingWu FengLi JianlingLi ZhiqiangXiao ZhuchuChen XuepingFeng PingChen JingyunXie SongpingLiang 《Genomics, Proteomics & Bioinformatics》 SCIE CAS CSCD 2003年第1期58-67,共10页
Differential proteome profiles of human lung squamous carcinoma tissue compared to paired tumor-adjacent normal bronchial epithelial tissue were established and analyzed by means of immobilized pH gradient-based two-d... Differential proteome profiles of human lung squamous carcinoma tissue compared to paired tumor-adjacent normal bronchial epithelial tissue were established and analyzed by means of immobilized pH gradient-based two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) and matrix-assisted laser desorp-tion/ionization time of flight mass spectrometry (MALDI-TOF-MS). The results showed that well-resolved, reproducible 2-DE patterns of human lung squamous carcinoma and adjacent normal bronchial epithelial tissues were obtained under the condition of 0.75-mg protein-load. The average deviation of spot position was 0.733±0.101 mm in IEF direction, and 0.925±0.207 mm in SDS-PAGE direction. For tumor tissue, a total of 1241±88 spots were detected, 987±65 spots were matched with an average matching rate of 79.5%. For control, a total of 1190±72 spots were detected, and 875±48 spots were matched with an average matching rate of 73.5%. A total of 864±34 spots were matched between tumors and controls. Forty-three differential proteins were characterized: some proteins were related to oncogenes, and others involved in the regulation of cell cycle and signal transduc-tion. It is suggested that the differential proteomic approach is valuable for mass identification of differentially expressed proteins involved in lung carcinogenesis. These data will be used to establish human lung cancer proteome database to further study human lung squamous carcinoma. 展开更多
关键词 human lung squamous carcinoma tissue normal bronchial epithelial tissue 2-d PAGE MALDI-TOF-MS PROTEOME
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FACE RECOGNITION FROM FRONT-VIEW FACE
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作者 Wu Lifang Shen Lansun (Signal & Information Processing Laboratory, Beijing Polytechnic University, Beijing 100022) 《Journal of Electronics(China)》 2003年第1期45-50,共6页
This letter presents a face normalization algorithm based on 2-D face model to recognize faces with variant postures from front-view face. A 2-D face mesh model can be extracted from faces with rotation to left or rig... This letter presents a face normalization algorithm based on 2-D face model to recognize faces with variant postures from front-view face. A 2-D face mesh model can be extracted from faces with rotation to left or right and the corresponding front-view mesh model can be estimated according to the facial symmetry. Then based on the inner relationship between the two mesh models, the normalized front-view face is formed by gray level mapping. Finally, the face recognition will be finished based on Principal Component Analysis (PCA). Experiments show that better face recognition performance is achieved in this way. 展开更多
关键词 Face normalization 2-d face model Geometric relation in face
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