中国科学院机构知识库网格系统: 检索

BSS-TFNet: Attention-Enhanced Background Signal Suppression Network for Time-Frequency Spectrum in Magnetic Particle Imaging 期刊论文 OAI收割
IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTATIONAL INTELLIGENCE, 2023, 页码: 15
作者: Wei, Zechen; Liu, Yanjun; Zhu, Tao; Yang, Xin; Tian, Jie

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收藏 | 浏览/下载：29/0 | 提交时间：2024/02/22

Magnetic particle imaging deep learning self-attention mechanism time-frequency spectrum background signal

A Revised Hilbert-Huang Transformation to Track Non-Stationary Association of Electroencephalography Signals 期刊论文 OAI收割
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, 2021, 卷号: 29, 页码: 841-851
作者: Shan, Xiaocai; Huo, Shoudong; Yang, Lichao; Cao, Jun; Zou, Jiaru

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收藏 | 浏览/下载：36/0 | 提交时间：2021/10/19

Electroencephalography Time-frequency analysis Transforms Wavelet transforms Oscillators Signal resolution Physiology EEG transient connectivity cross-spectrum Hilbert Huang transform

Phase-locked and non-phase-locked event-related oscillations and channel power spectra analysis during motor imagery with speed parameters for BCRI 会议论文 OAI收割
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011, Wuhan, China, May 10-12, 2011
作者: Fu YF(伏云发); Xu BL(徐保磊); Pei LL(裴立力); Li HY(李洪谊)

收藏 | 浏览/下载：35/0 | 提交时间：2012/06/06

Bioinformatics Biomedical engineering Feature extraction Frequency bands Investments Power spectrum Robots Time domain analysis Wavelet transforms

Improved peak power method for measuring frequency responses of photodetectors in a self-heterodyne system 期刊论文 iSwitch采集
Microwave and optical technology letters, 2010, 卷号: 52, 期号: 10, 页码: 2199-2203
作者: Wang, Li Xian; Zhu, Ning Hua; Ke, Jian Hong; Li, Wei; Chen, Shuo Fu

收藏 | 浏览/下载：33/0 | 提交时间：2019/05/12

Distributed bragg reflector laser Frequency response Photodetector Time-resolved spectrum Peak power method

IMPROVED PEAK POWER METHOD FOR MEASURING FREQUENCY RESPONSES OF PHOTODETECTORS IN A SELF-HETERODYNE SYSTEM 期刊论文 OAI收割
microwave and optical technology letters, 2010, 卷号: 52, 期号: 10, 页码: 2199-2203
Wang LX (Wang Li Xian); Zhu NH (Zhu Ning Hua); Ke JH (Ke Jian Hong); Li W (Li Wei); Chen SF (Chen Shuo Fu); Xie LA (Xie Liang)

收藏 | 浏览/下载：112/1 | 提交时间：2010/09/07

distributed Bragg reflector laser frequency response photodetector time-resolved spectrum peak power method

A sensitive solid-phase time-resolved fluorescence immunoassay apparatus (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
作者: Song K.-F.; Li J.-L.; Zhang W.-L.; Wang Y.-L.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

In the device a He-Ne laser of flash frequency 1-20 Hz was adopted as exciting light source and three key technical problems have been solved successfully in order to enhance the detecting sensitivity and measuring stability of the device for time-resolved fluorimmunoassays(TRFIA) [1]. The first one is to design optimum exciting optical system so that the exciting light beam excite the sample most effectively. The second one is to have a project spectrum filter which can reduce the affection of the background light to the photomultiplier tube and also ensure influence of the stray light and mixed diffusion light to the sample fluorescence to the least the sample fluorescence through the integrating sphere and come to the grating monochromator The right wavelength will be chosed through changing the angle of incidence of the grating monochromator. The third one is to simulate the principle of sample averaging of BOXCAR averager. In the device SCM was used as primary controller and CPLD was used as timing controller. Through the preparation process signal-to-noise ratio(SNR) will be improved also adjust delay time ampling frequency and sampling number arbitrarily. By testing the sensitivity is 10-12mol/L(substance marked by Eu3+) examination repeat is &le2.5% examination linearity is from 10 -8mol/L to 10-12mol/L correlation coefficient is 99.98%(p&le0.01). The instrument is advanced for ultrasensitive detection of antigen and antibody and solve the tumor genetic variation the virus protein detection. 2009 SPIE.

A high-accuracy parameter estimation algorithm for jointless Frequency-shift track circuit (EI CONFERENCE) 会议论文 OAI收割
ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China
作者: Zheng X.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

FSK (Frequency Shift keying) signal which has advantages of narrow-bandwidth strong anti-interference ability long transmission distance and so on is used in jointless Frequency-shift track circuit to send different kinds of control signals. However as FSK is non-linearly modulated parameter estimation with high accuracy is hard to realize. Based on the spectrum analysis complement with time-frequency distribution a highaccuracy FSK signal parameter estimation algorithm is put forward in this paper. According to the signal characteristics under-sampling and ZFFT are used to improve the accuracy of spectrum analysis and the base frequency resolution meets system requirement of 0.02Hz. Wigner-Ville distribution has an excellent time-frequency concentration while serious cross-term interference at the same time. Through the design of kernel function the cross-terms are almost suppressed and the upper/down side frequency resolution meets the system requirement of 0.2Hz. The effectivities of all the methods mentioned above have been proved by MATLAB simulation which pave a solid way for the development of high-accuracy FSK signal parameter estimation devices. 2008 IEEE.

基于电光调制的激光光谱整形技术 期刊论文 OAI收割
Chin. Opt. Lett., 2008, 卷号: 6, 期号: 11, 页码: 841, 844
王艳海; 王江峰; 姜有恩; 鲍岩; 李学春; 林尊琪

收藏 | 浏览/下载：1291/335 | 提交时间：2009/09/18

啁啾脉冲放大增益窄化光谱整形电光波导调制器孔径耦合带状线 Chirped laser pulses Chirped pulse amplification systems Chirped pulses Frequency intervals Gain narrowing Integrated waveguides Optic modulations Optical- Phase errors Pulse shapes Pulse spectrums Spectral shaping Spectrum shaping Strip lines Time domains Time intervals Waveform generators

Detection of the special gravity signals in sub-tidal band by using wavelet technique 期刊论文 OAI收割
CHINESE SCIENCE BULLETIN, 2006, 卷号: 51, 期号: 6, 页码: 713-722
作者: Sun, HP; Zheng, DW; Ding, XL; Chen, W; Chen, XD

收藏 | 浏览/下载：17/0 | 提交时间：2015/08/17

gravity signals in sub-tidal band wavelet time-frequency spectrum Earth's solid inner core Slichter modes

Displacement estimation by the phase-shiftings of fourier transform in present white noise (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wu Y.-H.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Displacement estimation is a fundamental problem in Real-time video image processing. It can be typically approached by theories based on features in spatial domain. This paper presents an algorithm which improves the theory for estimating the moving object's displacement in spatial domain by its Fourier transform frequency spectrum. Because of the characters of Fourier transform the result is based on all the features in the image. Utilizing shift theorem of Fourier transform and auto-registration the algorithm employs the phase spectrum difference in polar coordinate of two frame images sequence with the moving target1 2. The method needn't transform frequency spectrum to spatial domain after calculation comparing with the traditional algorithm which has to search Direc peak and it reduces processing time. Since the technique proposed uses all the image information including all the white noise in the image especially and it's hard to overcome the aliasing from noises but the technique can be an effective way to analyze the result in little white noise by the different characters between high and low frequency bands. It can give the displacement of moving target within 1 pixel of accuracy. Experimental evidence of this performance is presented and the mathematical reasons behind these characteristics are explained in depth. It is proved that the algorithm is fast and simple and can be used in image tracking and video image processing.