Dr. Yanxia Zhang Profile

Dr. Yanxia Zhang

at National Astronomical Observatories CAS

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 5 October 2012 Paper

Paper

Survey of approaches for targeting quasars

Yanxia Zhang, Yong-Heng Zhao

Proceedings Volume 8451, 845135 (2012) https://doi.org/10.1117/12.925298

KEYWORDS: Stars, Spectroscopy, Galactic astronomy, Astronomy, Ultraviolet radiation, Photometry, Radio optics, Detection and tracking algorithms, Contamination, Neural networks

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Proceedings Article | 24 September 2012 Paper

Paper

Support vector machines for photometric redshift measurement of quasars

Hongwen Zheng, Yanxia Zhang

Proceedings Volume 8451, 845133 (2012) https://doi.org/10.1117/12.925761

KEYWORDS: Galactic astronomy, Astronomy, Data modeling, Infrared radiation, Statistical analysis, Stars, Spectroscopy, Neural networks, Observatories, Evolutionary algorithms

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Proceedings Article | 24 September 2012 Paper

Paper

Review of techniques for photometric redshift estimation

Hongwen Zheng, Yanxia Zhang

Proceedings Volume 8451, 845134 (2012) https://doi.org/10.1117/12.925314

KEYWORDS: Galactic astronomy, Spectroscopy, Error analysis, Statistical analysis, Photometry, Data modeling, Neural networks, Surface conduction electron emitter displays, Astronomy, Machine learning

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Proceedings Article | 24 September 2012 Paper

Paper

Toolkit of automated database creation and cross-match

Yanxia Zhang, Hongwen Zheng, Tong Pei, Yongheng Zhao

Proceedings Volume 8451, 84511Z (2012) https://doi.org/10.1117/12.925763

KEYWORDS: Databases, Astronomy, Data integration, Computing systems, Observatories, Interfaces, Java, System integration, Data processing, Visualization

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Proceedings Article | 19 July 2010 Paper

Paper

A simple and effective algorithm for quasar candidate selection

Nanbo Peng, Yanxia Zhang, Tong Pei, Yongheng Zhao

Proceedings Volume 7740, 77402X (2010) https://doi.org/10.1117/12.856766

KEYWORDS: Stars, Astronomy, Telescopes, Astronomical imaging, Observatories, K band, Astrophysics, Large Synoptic Survey Telescope, Data mining, Databases

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Proceedings Article | 19 July 2010 Paper

Paper

Automated classification of pointed sources

Yanxia Zhang, Yongheng Zhao, Hongwen Zheng

Proceedings Volume 7740, 77402S (2010) https://doi.org/10.1117/12.856826

KEYWORDS: Stars, Astronomy, Feature selection, Observatories, Galactic astronomy, Feature extraction, Radio optics, Databases, Astrophysics, Algorithms

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Proceedings Article | 19 July 2010 Paper

Paper

Approaches for photometric redshift estimation of quasars from SDSS and UKIDSS

Dan Wang, Yan-xia Zhang, Yong-heng Zhao

Proceedings Volume 7740, 77402O (2010) https://doi.org/10.1117/12.856813

KEYWORDS: Spectroscopy, Galactic astronomy, Statistical analysis, Databases, Astronomy, Observatories, Infrared radiation, Telescopes, Astrophysics, Photometry

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Proceedings Article | 19 July 2010 Paper

Paper

A high efficient and fast kNN algorithm based on CUDA

Tong Pei, Yanxia Zhang, Yongheng Zhao

Proceedings Volume 7740, 77402G (2010) https://doi.org/10.1117/12.856768

KEYWORDS: Astronomy, Computer programming, Observatories, Computer architecture, Detection and tracking algorithms, Parallel computing, Graphics processing units, Galactic astronomy, Stars, Visualization

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Proceedings Article | 19 July 2010 Paper

Paper

Separating quasars from stars by support vector machines

Yanxia Zhang, Hongwen Zheng, Yongheng Zhao

Proceedings Volume 7740, 77402Z (2010) https://doi.org/10.1117/12.856828

KEYWORDS: Stars, Feature selection, Astronomy, Observatories, Databases, Galactic astronomy, Astrophysics, Data analysis, Data mining, Error analysis

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Proceedings Article | 19 July 2010 Paper

Paper

Comparison of several algorithms for celestial object classification

Nanbo Peng, Yanxia Zhang, Yongheng Zhao

Proceedings Volume 7740, 77402M (2010) https://doi.org/10.1117/12.856369

KEYWORDS: Stars, Point spread functions, Astronomy, Detection and tracking algorithms, Image classification, Observatories, Telescopes, Error analysis, Performance modeling, Astrophysics

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Proceedings Article | 19 July 2010 Paper

Paper

Support vector machines for quasar selection

Nanbo Peng, Yanxia Zhang, Yongheng Zhao

Proceedings Volume 7740, 77402T (2010) https://doi.org/10.1117/12.856374

KEYWORDS: Stars, Astronomy, Spectroscopy, Performance modeling, Space telescopes, Telescopes, Statistical modeling, Astronomical imaging, Observatories, Astrophysics

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Proceedings Article | 19 July 2010 Paper

Paper

An automated algorithm for determining photometric redshifts of quasars

Dan Wang, Yanxia Zhang, Yongheng Zhao

Proceedings Volume 7740, 77402Y (2010) https://doi.org/10.1117/12.856815

KEYWORDS: Spectroscopy, Point spread functions, Galactic astronomy, Astronomy, Observatories, Photometry, Surface conduction electron emitter displays, Performance modeling, Astrophysics, Astronomical imaging

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Proceedings Article | 3 April 2010 Paper

Paper

Throughput enhancement technique for MAPPER maskless lithography

M. Wieland, H. Derks, H. Gupta, T. van de Peut, F. Postma, A. H. van Veen, Y. Zhang

Proceedings Volume 7637, 76371Z (2010) https://doi.org/10.1117/12.849447

KEYWORDS: Semiconducting wafers, Lenses, Electron beams, Electron beam lithography, Lithography, Optical design, Lens design, Maskless lithography, Switching, Switches

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MAPPER Lithography is developing a maskless lithography technology based on massively-parallel electron-beam writing in combination with high speed optical data transport for switching the electron beams. With 13,000 electron beams each delivering a current of 13nA on the wafer, a throughput of 10 wph is realized for 22nm node lithography. By clustering several of these systems together high throughputs can be realized in a small footprint. This enables a highly cost-competitive alternative to double patterning and EUV. The most mature and reliable electron source currently available that combines a high brightness, a high emission current and uniform emission is the dispenser cathode. For this electron source a reduced brightness of 10⁶ A/m²SrV has been measured, with no restrictions on emission current. With this brightness however it is possible to realize a beam current of 0.3nA (@ 25nm spotsize), which is almost a factor 50 lower than the 13nA that is required for 10 wph. Three methods can be distinguished to increase the throughput: 1. Use an electron source with a 50× higher brightness 2. Increase the number of beams and lenses 50× 3. Patterned beams: Image multiple sub-beams with each projection lens MAPPER has selected option 3) 'Patterned beams' as the method to increase the beam current to 13nA. This because an electron source with a 50x higher brightness is simply not available at this time, and increasing the number of beams and lenses 50× leads to undesirable engineering issues. During the past years MAPPER has been developing the concept of 'Patterned beams'. By imaging 7×7 sub-beams per projection lens the beam current is increased to the required 13nA level. This technique will also be used to maintain throughput at 10 wph for smaller technology nodes by further increasing the number of sub-beams per projection lens. In this paper we will describe the electron optical design used to image these multiple sub-beams per lens, as well as experimental demonstration of this electron optical configuration. Also the writing strategy will be discussed, as well as the first patterning results. One of the key components for 'Patterned beams' is the beam blanker array, since each subbeam must be switched on and off individually. The design of the blanker deflectors, the circuitry, as well as experimental results of the blanker array will be shown. Finally the roadmap to further technology nodes will be discussed.

Proceedings Article | 16 July 2008 Paper

Paper

An automatic system for photometric redshift estimation based on sky survey data

Dan Wang, Yan-xia Zhang, Yong-heng Zhao

Proceedings Volume 7019, 701937 (2008) https://doi.org/10.1117/12.788429

KEYWORDS: Galactic astronomy, Cardiovascular magnetic resonance imaging, Spectroscopy, Databases, Space telescopes, Astronomy, X-ray telescopes, Photometry, System integration, Telescopes

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Proceedings Article | 15 July 2008 Paper

Paper

Predicting photometric redshifts with polynomial regression

Dan Wang, Yan-xia Zhang, Yong-heng Zhao

Proceedings Volume 7019, 70193A (2008) https://doi.org/10.1117/12.788443

KEYWORDS: Galactic astronomy, Spectroscopy, Photometry, Statistical analysis, Astronomy, Surface conduction electron emitter displays, Stars, Artificial neural networks, Systems modeling, Observatories

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Proceedings Article | 15 July 2008 Paper

Paper

Knowledge discovery in astronomical data

Yanxia Zhang, Hongwen Zheng, Yongheng Zhao

Proceedings Volume 7019, 701938 (2008) https://doi.org/10.1117/12.788417

KEYWORDS: Astronomy, Knowledge discovery, Data mining, Galactic astronomy, Statistical analysis, Databases, Data modeling, Stars, Data processing, Data analysis

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Proceedings Article | 9 July 2008 Paper

Paper

System architectural design of multiwavelength data mining

Yanxia Zhang, Yongheng Zhao, Hongwen Zheng

Proceedings Volume 7017, 70171M (2008) https://doi.org/10.1117/12.788398

KEYWORDS: Data mining, Astronomy, Databases, Mining, Data modeling, Detection and tracking algorithms, Statistical analysis, X-ray astronomy, X-ray optics, Gamma radiation

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Proceedings Article | 27 June 2006 Paper

Paper

A system integrated with query, cross-matching, and visualization

Dan Gao, Yanxia Zhang, Yongheng Zhao

Proceedings Volume 6274, 627414 (2006) https://doi.org/10.1117/12.670138

KEYWORDS: Databases, Visualization, Astronomy, Visual analytics, Observatories, Data mining, System integration, Data archive systems, Cadmium sulfide, Spherical lenses

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Proceedings Article | 27 June 2006 Paper

Paper

Software kits for measuring photometric redshifts

Dan Wang, Yanxia Zhang, Chenzhou Cui, Yongheng Zhao

Proceedings Volume 6274, 627413 (2006) https://doi.org/10.1117/12.670136

KEYWORDS: Galactic astronomy, Cardiovascular magnetic resonance imaging, Spectroscopy, Surface conduction electron emitter displays, Matrices, Algorithm development, Artificial neural networks, Astronomy, Software development, Neural networks

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Proceedings Article | 16 September 2004 Paper

Paper

An automated classification algorithm for multiwavelength data

Yan-Xia Zhang, A-Li Luo, Yong-Heng Zhao

Proceedings Volume 5493, (2004) https://doi.org/10.1117/12.550982

KEYWORDS: Feature selection, Galactic astronomy, X-rays, X-ray optics, Detection and tracking algorithms, Data mining, Infrared radiation, Stars, Astronomy, Observatories

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Proceedings Article | 16 September 2004 Paper

Paper

Outlier detection in astronomical data

Yan-Xia Zhang, A-Li Luo, Yong-Heng Zhao

Proceedings Volume 5493, (2004) https://doi.org/10.1117/12.550998

KEYWORDS: Astronomy, Data mining, Knowledge discovery, Statistical analysis, Algorithm development, Databases, Observatories, Data archive systems, Galactic astronomy, Visualization

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Proceedings Article | 16 September 2004 Paper

Paper

Mining the LAMOST spectral archive

A-Li Luo, Yan-Xia Zhang, Jian-Nan Zhang, Yong-Heng Zhao

Proceedings Volume 5493, (2004) https://doi.org/10.1117/12.551641

KEYWORDS: Galactic astronomy, Principal component analysis, Data archive systems, Data mining, Mining, Databases, Data modeling, Astronomy, Spectroscopy, Stars

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Proceedings Article | 15 September 2004 Paper

Paper

Design and implementation of the spectra reduction and analysis software for LAMOST Telescope

A-Li Luo, Yan-Xia Zhang, Yong-Heng Zhao

Proceedings Volume 5496, (2004) https://doi.org/10.1117/12.548737

KEYWORDS: Galactic astronomy, Databases, Spectroscopy, Data modeling, Human-machine interfaces, Principal component analysis, Telescopes, Stars, Spectrographs, Spectral calibration

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Proceedings Article | 19 December 2002 Paper

Paper

Classification of AGNs from stars and normal galaxies by surport vector machines

Yanxia Zhang, Chenzhou Cui, Yongheng Zhao

Proceedings Volume 4847, (2002) https://doi.org/10.1117/12.460412

KEYWORDS: Galactic astronomy, X-ray optics, Stars, X-rays, Infrared radiation, Astronomy, Active optics, Geometrical optics, Observatories, Neural networks

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Showing 5 of 24 publications

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