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Development of Superconducting Spectroscopic Array Receiver: A Multibeam 2SB SIS Receiver for Millimeter-Wave Radio Astronomy 期刊论文
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, 2012, 卷号: 2, 期号: 6, 页码: 593-604
作者:  Shan, Wenlei;  Yang, Ji;  Shi, Shengcai;  Yao, Qijun;  Zuo, Yingxi
收藏  |  浏览/下载：41/0  |  提交时间：2013/01/31
The application of adaptive enhancement algorithm based on gray entropy in mammary gland CR image (EI CONFERENCE) 会议论文
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
Zhang M.-H.; Zhang Y.-Y.
收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25
Mammary gland is composed entirely of soft tissue with approximate density  therefore mammary gland CR medicine radiation image presents a low contrast  and slight difference changes may be a manifestation of tumor  so it is necessary to enhance mammary gland CR image to improve its visual quality in order to meet the demands of doctor's clinical diagnosis. However the general enhancement algorithms over enhance the contrast and noise  due to image details lost  aiming at the defects  a mammary gland CR medicine image adaptive enhancement arithmetic based on image gray entropy is put forward. The arithmetic adapts dizzy image to magnify selected spatial frequency response in order to enhance the edge details of mammary gland CR images. It can adjust weighted factor K according to image gray characteristics namely pixel gray entropy. Experiments results demonstrate that mammary gland CR image enhanced by the algorithm has abundant details and high signal-to-noise ratio  moreover  CR image enhanced has good visual effect. So the method is effective and fit for enhancing CR medical radiation image edge details. 2012 IEEE.  
Improved TOPS about direction of arrival estimation for wideband signals (EI CONFERENCE) 会议论文
2011 International Conference on Vibration, Structural Engineering and Measurement, ICVSEM2011, October 21, 2011 - October 23, 2011, Shanghai, China
He B.
收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25
The study about the direction-of-arrival (DOA) estimation for wideband signals is a basic topic of Signal Processing. The method called test of orthogonality of projected subspaces (TOPS) does not require initial values to form focusing matrix compared with the coherent signal subspace method (CSSM)  but it has poor performance for coherent wideband signals at low signal-to-noise ratio (SNR). Based on the lack of the conventional TOPS  this paper reconstructs a set of new matrices with the narrowband correlated matrices coming from the DFT decomposition of the array output and modifies the method frame of the conventional TOPS. So we get a set of reconstructed matrices with full rank corresponding to each frequency bin  and which have no array aperture loss. The improved TOPS can estimate the DOA for coherent wideband sources at low SNR  and enhances the performance of the conventional TOPS. Simulation results show that the improved TOPS is effective  and the total performance of which is similar to the rotational signal-subspace (RSS) method. (2012) Trans Tech Publications.  
The application of Kalman filtering technique on the multi-position strap-down north seeking system (EI CONFERENCE) 会议论文
2012 5th International Symposium on Computational Intelligence and Design, ISCID 2012, October 28, 2012 - October 29, 2012, Hangzhou, China
Shen C.-W.; Liu C.; Liu S.-J.; Cai S.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
The research of digltal CR medicine image adapitive enhancement method (EI CONFERENCE) 会议论文
4th International Conference on Mechanical and Electrical Technology, ICMET 2012, July 24, 2012 - July 26, 2012, Kuala Lumpur, Malaysia
Ming-Hui Z.; Yao-Yu Z.
收藏  |  浏览/下载：54/0  |  提交时间：2013/03/25
Digital CR medicine radiation image is in doctor's favor and has became medicine imaging technology new hot spot because of its high gray contrast  powerful computer disposal function  little radiation dosage  non-film diagnosis  different area consultation. But degradation of digital X-ray medical image such as low contrast and blurring during radiographic imaging  caused by complexity of body tissue and effects of X-ray scattering and electrical noise etc.  can worsen the results of analysis and diagnosis. So it is usually needed that CR medicine image is enhanced to improve its vision quality  and easy to doctor's more accurate diagnosis. The general enhancement algorithms over enhancing the contrast and lose image details  aiming at the defects  an enhancement algorithm for CR image is proposed based on the ratio of deviation to mean of domain. The arithmetic enhance CR image edge details by adjusting factor K based on the ratio of deviation to mean of domain of CR image. Experiment results demonstrate that the algorithm enhances CR image detail and CR image enhanced has good visual effect  the adaptive enhancement method is fit for CR medicine image. (2012) Trans Tech Publications  Switzerland.  
A novel compact low-power direct conversion receiver for mobile UHF RFID reader 期刊论文
science china information sciences, 2012
Liu Shan; Wang Xin' Shen JinPeng; Wang Bo; Ye Tao; Huang Ru; An
收藏  |  浏览/下载：4/0  |  提交时间：2015/11/12
一款工作于2．4GHz频段的带有源负载的高性能双平衡有源混频器 期刊论文
北京大学学报 自然科学版, 2012
姜梅; 张兴; 王新安; 刘珊; 徐锋; 汪波; 宗洪强; 沈劲鹏
收藏  |  浏览/下载：3/0  |  提交时间：2015/11/16
A Low Noise, Fast Set-up Low-Dropout Regulator in 65nm Technology 其他
2012-01-01
Xiao, Yongqiang; Lu, Wengao; Chen, Meng; Zhang, Yacong; Chen, Zhongjian
收藏  |  浏览/下载：3/0  |  提交时间：2015/11/16
A 14-bit Column-level ADC for IRFPA 其他
2012-01-01
Zhang Yajing; Lu Wengao; Chang Yikun; Chu Hai; Wang Guannan; Zhang Yacong; Chen Zhongjian
收藏  |  浏览/下载：3/0  |  提交时间：2015/11/16
基于原模图LDPC码的不等保护传输性能研究 期刊论文
2012
聂浩斌; 何继光; 王琳
收藏  |  浏览/下载：2/0  |  提交时间：2016/05/17

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