General

Yanxia Zhang 

National Astronomical Observatory          
Chinese Academy of Sciences                    
Datun Road 20A, Chaoyang District
Beijing 100012, China

Tel:  (8610)64841693 
FAX: (8610)64878240
Email: zyx@bao.ac.cn


Research Areas

● data mining and knowledge discovery in astronomy

● multiwavelength astronomy

● classification and clustering of astronomical objects 

● outlier finding algorithms to find rare, or unknown classes of objects or  phenomena

Experience

1. B.A.: Hebei Normal University, Shijiazhuang, Hebei Province (1997).
    Major: Physics.

2. M.S.: Hebei Normal University, Shijiazhuang, Hebei Province (2000).
    Major: Astrophysics.

3. Ph.D.: National Astronomical Observatories, CAS, Beijing (2003).
    Major: Astrophysics.
Work Experience
1. 2013-pres. Professor, National Astronomical Observatories, 
     Chinese  Academy of Sciences, Beijing


2. 2006-2013. Associate Professor, National Astronomical
    Observatories, Chinese Academy of Sciences, Beijing
 
3. 2003-2005. Assistant Professor, National Astronomical
    Observatories, Chinese Academy of Sciences, Beijing 

Publications

Zhang, Y., Zhao, Y., Astronomy in the Big Data Era, Data Science Journal, 2015, 14(11), pp.1-9 

Zhang,Yan-xia, Zhou, Xin-lin, Zhao, Yong-heng, Wu, Xue-bing, Statistical Study of 2XMMi-DR3/SDSS-DR8 Cross-correlation Sample, 2013,AJ, 145,42-54 

Peng Nanbo,Zhang Yanxia and Zhao Yongheng, A SVM-kNN Method for Quasar-Star Classification, 2013,Science in China G: Physics and Astronomy, 56(6),1-8

Zhang Yanxia, Ma He, Peng Nanbo, Zhao Yongheng, Wu Xue-bing, Estimating Photometric Redshifts of Quasars via K-nearest Neighbors Approach Based on Large Survey Databases,2013, AJ,146,22-31

Han, Bo; Ding, Hong-Peng; Zhang, Yan-Xia; Zhao, Yong-Heng, Photometric redshift estimation for quasars by integration of KNN and SVM,Research in Astronomy and Astrophysics, 2016,Volume 16, Issue 5, 74,10pp   

Bo Han, Yan-Xia Zhang, Shou-Bo Zhong, Yongheng Zhao,Astronomical data fusion tool based on PostgreSQL,Research in Astronomy and Astrophysics, 2016,Volume 16, Issue 11,178,8pp

Zhang,Yan-xia, Zhou, Xin-lin, Zhao, Yong-heng, Wu, Xue-bing, Statistical Study of 2XMMi-DR3/SDSS-DR8 Cross-correlation Sample, 2013,AJ, 145,4 
Zhang,Yanxia, Zhao, Yongheng, Zheng, Hongwen, Wu, Xue-bing, Classification of Quasars and Stars by Supervised and Unsupervised Methods, 2013, Proceedings IAU Symposium 288, 333 
 

Yuan, Hailong; Zhang, Haotong; Zhang, Yanxia; Lei, Yajuan; Dong, Yiqiao; Zhao, Yongheng, ASERA: A spectrum eye recognition assistant for quasar spectra, 2013,Astronomy and Computing, Volume 3, p. 65-69
Zhang, Yanxia, Li, Lili, Zhao, Yongheng, Morphology Classification and Photometric Redshift Measurement of Galaxies, 2009, MNRAS, 392,233-239 
Zhang, Yanxia, & Zhao, Yongheng. “Automated clustering algorithms for classification of astronomical objects”, 2004, A&A, 422, 1113-1121 
Zhang, Yanxia. “Research on Automatic Classification Methods in Multiwavelength Astrophysics”, 2004, PASP, 116, 184 
Zhang, Yanxia, & Zhao, Yongheng. “Classification in Multidimensional Parameter Space: Methods and Examples”, 2003, PASP, 115, 1006-1018 
Zhang, Yan-xia, & Zhao, Yong-heng. “Learning Vector Quantization for Astronomical Objects Classification”, 2003, ChJAA, 3, 183 
Zhang, Yanxia, Zhao, Yongheng, “A Comparison of BBN, ADTree and MLP in separating Quasars from Large Survey Catalogues”,2007, ChJAA, 7, 289-296
Zhang, Yanxia, Zhao,Yongheng,Gao,Dan, Decision table for classifying point sources based on FIRST and 2MASS databases,2008, Advances in Space Research, Volume 41, Issue 12, p. 1949-195 
Gao, Dan, Zhang,Yanxia, Zhao,Yongheng, Random forest algorithm for classification of multiwavelength data, 2009, RAA,9, 220-226
Gao, Dan, Zhang, Yanxia, Zhao,Yongheng, Support vector machines and kd-tree for separating quasars from large survey data bases,2008,MNRAS, 386(3), pp. 1417-1425 
Wang, Dan, Zhang, Yanxia, Liu, Chao, Zhao, Yongheng, Two Novel Approaches for Photometric Redshift Estimation based on SDSS and 2MASS,2008,ChJAA,8(1), pp. 119-126 
Zhao, Yongheng, Zhang, Yanxia, Comparison of decision tree methods for finding active objects,2008, Advances in Space Research, Volume 41, Issue 12, p. 1955-1959 
Zheng, Hongwen, Zhang, Yanxia, Feature selection for high-dimensional data in astronomy,2008, Advances in Space Research, Volume 41, Issue 12, p. 1960-1964 
Wang Dan, Zhang, Yan-Xia et al., 2007, Kernel Regression For Determining Photometric Redshifts From Sloan Broadband Photometry”, MNRAS, 382, 1601 -1606
Li, Lili, Zhang, Yanxia, Zhao, Yongheng, Yang, Dawei, “Estimating Photometric Redshifts with Artificial Neural Networks and Multi-parameters”,2007, ChJAA, 7, 448 
Yan, Taisheng; Zhang, Yanxia; Zhao, Yongheng; Li, Ji, Exploration of SDSS stellar database by AutoClass, Science in China Series G, 2011, Vol. 54 (9): 1717-1726 
Li, Lili, Zhang,Yanxia,Zhao,Yongheng,k-nearest neighbors for automated classification of celestial objects, 2008, Science in China, Series G,51(7), 916-922 
Zhang, Bo, Li, Ji, Wang, Yue-Xiang, Zhang, Yan-Xia, et al., ”Two R-Process Components in Ultra-Metal-Poor Stars: The Neutron-Capture Element Distribution of CS 22892-052”, 2002, Ap&SS, 280, 325 
Zhang, Bo, Zhang, Yan-xia, Li, Ji, Peng, Qiu-he, “A Statistical Model for Predicting the Average Abundance Patterns of the Heavier Elements in Metal-Poor Stars”, 2002, ChJAA, 2, 429 
Zhang, Y.-X., Zhang, B., Li, J., et al., “The average abundance of heavy elements in metal-poor stars in different metallicity ranges”, 2001, ChA&A, 25, 187 
Zhang, Bo, Zhang, Yan-Xia, Liu, Jun-Hong, et al., ”The abundance distribution of neutron-capture elements in metal-poor stars”, 2001, ChA&A, 25, 298
 


Students

已指导学生

裴彤  硕士研究生  070420-天文技术与方法  

彭南博  博士研究生  070420-天文技术与方法  

张静怡  博士研究生  0704Z1-天文技术与方法  

金鑫  硕士研究生  070401-天体物理  

现指导学生

李长华  博士研究生  0704Z1-天文技术与方法