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Your search keyword '"Li, Xiao-Ping"' showing total 13 results
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13 results on '"Li, Xiao-Ping"'

1. Automatic EEG artifact removal: a weighted support vector machine approach with error correction

Author

Shao, Shi-Yun, Shen, Kai-Quan, Ong, Chong Jin, Wilder-Smith, Einar P.V., and Li, Xiao-Ping

Subjects
Electroencephalography -- Research, Error-correcting codes -- Analysis, Biological sciences, Business, Computers, Health care industry
Abstract

An automatic electroencephalogram (EEG) artifact removal method is presented in this paper. Compared to past methods, it has two unique features: 1) a weighted version of support vector machine formulation that handles the inherent unbalanced nature of component classification and 2) the ability to accommodate structural information typically found in component classification. The advantages of the proposed method are demonstrated on real-life EEG recordings with comparisons made to several benchmark methods. Results show that the proposed method is preferable to the other methods in the context of artifact removal by achieving a better tradeoff between removing artifacts and preserving inherent brain activities. Qualitative evaluation of the reconstructed EEG epochs also demonstrates that after artifact removal inherent brain activities are largely preserved. Index Terms--Artifact removal, electroencephalogram, error correction, weighted support vector machine (SVM).

Published
2009

2. A feature selection method for multilevel mental fatigue EEG classification

Author

Shen, Kai-Quan, Ong, Chong-Jin, Li, Xiao-Ping, Hui, Zheng, and Wilder-Smith, Einar P.V.

Subjects
Electroencephalography -- Usage, Mental fatigue -- Identification and classification, Biomedical engineering -- Research, Biological sciences, Business, Computers, Health care industry
Abstract

Two feature selection approaches for multilevel mental fatigue electroencephalogram (EEG) classification are presented in this paper, in which random forest (RF) is combined with the heuristic initial feature ranking scheme (INIT) or with the recursive feature elimination scheme (RFE). In a 'leave-one-proband-out' evaluation strategy, both feature selection approaches are evaluated on the recorded mental fatigue EEG time series data from 12 subjects (each for a 25-h duration) after initial feature extractions. The latter of the two approaches performs better both in classification performance and more importantly in feature reduction. RF with RFE achieved its lowest test error rate of 12.3% using 24 top-ranked features, whereas RF with INIT reached its lowest test error rate of 15.1% using 64 top-ranked features, compared to a test error rate of 22.1% using all 304 features. The results also show that 17 key features (out of 24 top-ranked features) are consistent between the subjects using RF with RFE, which is superior to the set of 64 features as determined by RF with INIT. Index Terms--Electroencephalogram (EEG), feature selection, mental fatigue, random forests.

Published
2007

3. Effect of liquid crystal orientation on LC/polymer gratingelectro-optical properties and lasing emission properties

Author

胡五生 Hu Wu-sheng, 宣丽 Xuan Li, 刘永刚 Liu Yonggang, 李小平 Li Xiao-ping, and 刘明欢 Liu Ming-huan

Subjects
chemistry.chemical_classification, Materials science, chemistry, Liquid crystal, business.industry, Signal Processing, Optoelectronics, Polymer, Orientation (graph theory), business, Instrumentation, Lasing threshold, Electronic, Optical and Magnetic Materials
Published
2018

4. Quantitative analysis on phase diversity technique based on liquid crystal spatial light modulator

Author

徐梓浩 Xu Zi-hao, 杨程亮 Yang Cheng-liang, 于洪丽 Yu Hong-li, 胡五生 Hu Wu-sheng, 张佩光 Zhang Pei-guang, 宣 丽 Xuan Li, and 李小平 Li Xiao-ping

Subjects
Materials science, business.industry, Phase diversity, 02 engineering and technology, Liquid crystal spatial light modulator, 021001 nanoscience & nanotechnology, 01 natural sciences, Electronic, Optical and Magnetic Materials, 010309 optics, Optics, 0103 physical sciences, Signal Processing, 0210 nano-technology, business, Instrumentation, Quantitative analysis (chemistry)
Published
2017

5. Negative Refractive Index Liquid Crystal at Mid-Infrared Wavelength

Author

李晓平 Li Xiao-ping, 彭增辉 Peng Zeng-hui, 贾丹 Jia Dan, 宣丽 Xuan Li, and 杨程亮 Yang Cheng-liang

Subjects
Materials science, business.industry, Mid infrared, Refractive index profile, Negative index metamaterials, Electronic, Optical and Magnetic Materials, Wavelength, Normalized frequency (fiber optics), Optics, Liquid crystal, Signal Processing, Step-index profile, business, Instrumentation
Published
2013

6. Recent progress in liquid crystal adaptive optical techniques

Author

曹召良 Cao Zhao-liang, 胡立发 Hu Li-fa, 彭增辉 Peng Zeng-hui, 姚丽双 Yao Li-shuang, 李小平 Li Xiao-ping, 刘永刚 Liu Yonggang, 穆全全 Mu Quan-quan, and 宣丽 Xuan Li

Subjects
Physics, Diffraction, business.industry, Resolution (electron density), General Engineering, Deformable mirror, law.invention, Telescope, Optics, law, Observatory, Liquid crystal, Metre, Adaptive optics, business
Abstract

Advances in Liquid Crystal Adaptive Optical Systems(LC AOS) are described for Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences(CIOMP,CAS) in this paper.For two bottlenecks of low energy utilization ratio and slow correction frequency in LC AOS problems,a series of effective methods are presented by the LC AOS working group.The low energy utilization ratio has been improved from 5% to 85%,which is similar to that of the deformable mirror based AOSs.Furthermore,the correction frequency of the LC AOS is also greatly improved from 5 Hz to 140 Hz,which is closed to the ability of correction for atmospheric turbulence.According to these research results,two LC AOSs which correspond to a 2.16 meter Telescope(located at Xinglong Station of Beijing Astronomical Observatory) and a 1.2 meter telescope(located at CIOMP,CAS) are designed to correct the stars.Obtained results show that the resolution ability of the star for the 1.2 meter telescope is up to 3 times of the diffraction limitation.

Published
2012

7. Suppression of stray light for long focal length off-axis three-mirror optical system

Author

李晓平 Li Xiao-ping, 沙晟春 Sha Sheng-chun, and 胡亭亮 Hu Ting-liang

Subjects
Ray tracing (physics), Physics, Optics, Transmission (telecommunications), Stray light, Point source, Scattering, business.industry, Focal length, business, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Abstract

Stray light characteristics of an off-axis three-mirror optical system with a middle image and long-focus was simulated and analyzed,and corresponding suppression method for the stray light was proposed.By a forward and reverse ray tracing method,the main source of stray light was identified and an important surface of the system was found out.According to the analysis results,some corresponding suppression measures were proposed to reduce the stray light of the optical system.The effect of stray light reduction were evaluated by comparing the number of important surfaces before and after the measures.The analysis results show that the first-order scattering stray light has been well suppressed.Furthermore,the Point Source Transmission(PST) was used to evaluate the stray light suppression capability,and its quantitative analysis was impletmented by calculating the PST of ±40° off-axis angles in EW and NS,respectively.

Published
2011

8. Automatic Phase Aberration Compensation for Digital Holographic Microscopy Combined with Phase Fitting and Deep Learning

Author

肖文 Xiao Wen, 李小平 Li Xiao-ping, 潘锋 Pan Feng, 曹闰禹 Cao Run-yu, 杨璐 Yang Lu, and 姚田 Yao Tian

Subjects
Phase aberration, Optics, Materials science, business.industry, Phase fitting, Deep learning, Digital holographic microscopy, Artificial intelligence, business, Atomic and Molecular Physics, and Optics, Compensation (engineering)
Published
2018

9. Experiment studies on the polarized gamma-rays generation at KEK-ATF

Author

Li Xiao-Ping and Pei Guo-Xi

Subjects
Physics, Nuclear and High Energy Physics, Photon, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Compton scattering, Gamma ray, Physics::Optics, Astronomy and Astrophysics, Laser, Pulse (physics), law.invention, Finesse, Positron, Optics, law, Cathode ray, Physics::Accelerator Physics, Atomic physics, business, Instrumentation
Abstract

Polarized positrons can be created through electron-positron pair creation from circularly polarized gamma-rays. Laser?Compton scattering is an efficient method to generate circularly polarized gamma-rays. A high finesse 2-mirror optical stacking cavity had been installed on the straight section of the electron storage ring at KEK-ATF. A 1064 nm circularly polarized pulsed laser beam was stacked in the cavity. Polarized gamma-rays with a maximum energy of 28.3 MeV were produced via inverse Compton scattering of the enhanced laser pulse off an electron beam of 1.28 GeV. The number of generated gamma photons per collision was estimated by a photon detector. It was found that the experimental result was in agreement with the simulated value.

Published
2009

11. Review of Application of Robots in Health Care

Author

Fan Liang Zhi, A.Y. Elatta ., Li Pei Gen, and Li Xiao Ping

Subjects
Nursing, Computer science, business.industry, Health care, Computer Science (miscellaneous), Self care, Robot, business, Unlicensed assistive personnel, Health policy
Published
2002

12. A improved reservation random-access protocol for voice/data integrated spread-spectrum multiple-access system

Author

Li Xiao-Ping, Zheng Lu, and Wu Shi-Qi

Subjects
Queueing theory, Network packet, business.industry, Computer science, Real-time computing, Broadcasting, Spread spectrum, Base station, Broadcasting (networking), Telecommunications link, business, Queue, Communication channel, Computer network
Abstract

In this paper, an improved reservation code multiple access (IRCMA) which is based on a pervious RCMA protocol for a spreading-spectrum, is presented. An additional call admission channel for voice terminals is added. The waiting voice terminal enter a queue in the base station. Theoretical performance measures of the voice packet-dropping probability and the average data packet delay are derived by means of equilibrium point analysis and examined by extensive computer simulation.

Published
2002

13. Clinical observation on 30 cases of chronic renal failure treated with Shentekang Capsule and peritoneal dialysisand peritoneal dialysis

Author

Sun Jian-Shi, Yang Yong-Ming, Li Hui-Qun, Ye Ren-gao, Li Xiao-Ping, Lu Cai-Sheng, and Ren Guo-Hui

Subjects
Creatinine, medicine.medical_specialty, business.industry, medicine.medical_treatment, Random method, Capsule, General Medicine, Gastroenterology, Peritoneal dialysis, chemistry.chemical_compound, chemistry, Internal medicine, medicine, Chronic renal failure, Combined therapy, Hemoglobin, business, Blood urea nitrogen
Abstract

Objective: To evaluate the effect of Shentekang Capsule (STKC) combined with peritoneal dialysis (PD) in treating chronic renal failure (CRF).Methods: With single-blind, parallel control and random method, 60 cases of CRF patients were equally divided into 2 groups: (1) STKC group treated with combined therapy of STKC and PD; (2) control group treated with PD alone. The course of treatment were 1~2 months for both groups. Clinical manifestations, blood urea nitrogen, serum creatinine, total protein and hemoglobin were observed before and after the treatment. Results: Blood urea nitrogen decreased in both groups after treatment as compared with that before treatment significantly (P 0. 05). However, levels of serum total protein and hemoglobin of the STKC group after treatment were higher than those of the control group (P < 0.01). Clinical manifestation in STKC group also showed more improvement after treatment than that in the control group. Conclusion: STKC could improve nutritional state and quality of CRF patient’s life treated with PD.

Published
1997

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