A5101432919- Ophthalmology and Visual Impairment Studies
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Corneal surgery and disorders
- Speech and Audio Processing
- Indoor and Outdoor Localization Technologies
- Sparse and Compressive Sensing Techniques
- Intraocular Surgery and Lenses
- Glaucoma and retinal disorders
- Direction-of-Arrival Estimation Techniques
- Evaluation Methods in Various Fields
- Metamaterials and Metasurfaces Applications
- Microwave Imaging and Scattering Analysis
- Optical Systems and Laser Technology
- Evaluation and Optimization Models
- Advanced optical system design
- Antenna Design and Optimization
- Soil Moisture and Remote Sensing
- Transportation Planning and Optimization
- Microwave and Dielectric Measurement Techniques
- Sulfur-Based Synthesis Techniques
- Advanced Decision-Making Techniques
- Wind and Air Flow Studies
- Process Optimization and Integration
- Evacuation and Crowd Dynamics
Army Medical University
2024-2025
Southwest Medical University
2025
Zhengzhou University
2024
Tsinghua University
2024
China Three Gorges University
2019-2021
Huazhong University of Science and Technology
2014
Fourth Affiliated Hospital of China Medical University
2012
Beijing University of Technology
2011
The Central Hospital of Shaoyang
2011
Chinese Academy of Sciences
2009
Comprehensive Summary The dearomatization of indole derivatives bearing amide functionalities presents a significant challenge due to the inherent stability carbonyl group, resulting from nitrogen lone‐pair delocalization that imparts increased resonance stabilization. In this study, we report visible‐light photocatalytic intramolecular with groups, achieving synthesis spiroindolines via energy transfer. This method enables efficient formation range hydroxyl‐substituted in moderate high...
Poor data and code (DAC) sharing undermines open science principles. This study evaluates the stringency of DAC availability policies in high-profile medical journals identifies policy-practice gaps (PPG) published articles. 931 Q1 (Clarivate JCR 2021) were evaluated, with PPGs quantified across 3,191 articles from The BMJ, JAMA, NEJM, Lancet. Only 9.1% (85/931) mandated statements, 70.6% these lacking mechanisms to verify authenticity, 61.2% allowing publication despite invalid sharing....
Aiming at the time-consuming problem of full-wave (FW) simulation scattering characteristics traditional graphene reconfigurable reflectarray antenna, a fast prediction method electromagnetic (EM) response based on deep learning is proposed. The convolutional neural network (CNN) in effectively used research this paper. This first discretizes input vector (patch geometry, chemical potential, frequency, incident angle, etc.) and then preprocesses data into two-dimensional image suitable for...
The analysis of the graphene reconfigurable reflectarray antenna electromagnetic (EM) response through use support vector regression (SVR) has been carried out in this paper. EM original is transformed into a estimation problem by SVR. In work, we consider up to 6 degrees freedom: width W and length L patch, chemical potential μ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> , working frequency f, elevation θ azimuth angles φ incident...
In this letter the application of advanced machine learning method to predict electromagnetic (EM) response reflectarray antenna elements with complex shapes is explored. The calculation scattering coefficients passive periodic intervals arbitrary degrees freedom firstly transformed into a regression estimation problem, and then an analysis model established by sample based on support vector (SVR). Through series numerical experiments evaluate accuracy efficiency show that, compared...
Abstract Background The spurious and unavailable data/code sharing actions are crashing open medical sciences. In this study, we aimed to illustrate how high-profile journals practically carried out their policies what questionable practices regarding conducted by authors. Methods appraised the policy on availability of ranked at Q1 according Clarivate Journal Citation Report (JCR 2021). Furthermore, recruited post-publications published four leading (i.e., BMJ, JAMA, NEJM Lancet) from...
First-tracking publications to covid-19-related meta-analytic evidences benefited evidence-based policymaking for safeguarding public mental health in this pandemic. However, such makeshifts had been concerned cause troubling unreliable estimates problems epidemics. From 98 studies with 18,604,876 individuals across 94 countries published the pandemic, we found significant risk of bias (ROBs) publication, one meta-analysis being per five days at peak. Despite large-scale samples these...
We have studied theoretically a beat effect in four-level system due to fifth-order optical polarization, and considered the cases that pump beams either narrowband or broadband linewidth. found accuracy for energy-level splitting meaurement is determined by homogeneous linewidths of transitions. That say, this technique can achieve Doppler-free precision measurement eaergy level between two excited states which are dipolar forbidden from ground state.
Based on the multi-task Bayes Compressive Sensing (MT-BCS), a Direction-Of-Arrival (DOA) and bandwidth (BW) estimation strategy impinging linear array using multiple snapshots data is proposed. The DOA as reconstruction of sparse signal constrained by Laplace prior through Sensing. Receiving wideband array, space divided into I parts according to equal interval. interest are assumed be represented I-dimensional vector S, can reconstructed accurately only small number. receiving antenna...
The Direction-of-Arrival (DoA) and bandwidth (BW) estimation strategy impinging on a linear array using multiple snapshots data is addressed within the multitask Bayesian Compressive Sensing (MT-BCS). DoA used as reconstruction of sparse signal constrained by Laplace prior through Sensing. Receiving wideband array, space divided into I parts according to equal interval. interest are assumed be represented I-dimensional vector, can reconstructed accurately only small number M . receiving...
In this letter, support vector regression (SVR) is used to predict the electromagnetic (EM) response of a complex shaped reflectarray (RA) unit cell. The calculation scattering coefficients passive RA elements with periodic intervals firstly transformed into estimation problem, and then an analysis model established by SVR quickly EM cells. To end, full-wave (FW) simulation software obtain set random samples coefficient matrix antenna cell, which for training. Under same conditions, radial...
In this paper, the two-dimensional target microwave imaging is studied by using compressive sensing method. Based on electric field integral equation and discrezation of region, a observation matrix established, multiple scattering points are set up to be obtained based moment Finally, reconstruction method used perform position dielectric constant. Reconstruction example includes effects different numbers, size targets, inhomogeneous noise. The numerical simulation results verify...
In this letter the application of Least Squares Support Vector Machines (LS-SVM) to soil moisture inversion based on active and passive microwave data is explored. The integral equation model (IEM) chosen obtain backscattering coefficients which serve as for simulation. Similarly, emissivity applied perform simulations under a large range surface roughness conditions in order acquire brightness temperature generate datasets. frequencies interest include 1.4 GHz (L-band), 6.9 (C-band) well...
To reconstruct sparsely distributed inhomogeneous objects, a Bayesian compressed sensing microwave imaging method based on Gauss prior is proposed. In the first order Born approximation, sparse model established electric field integral equation and mesh discretization in region. The probability density function constructed. objective optimized by using relevance vector machine method. simulation of multi-target non-uniform target studied, influence noise considered. results show that...
In this paper, the application of advanced Support Vector Regression (SVR) approach in predicting electromagnetic (EM) response graphene reconfigurable patch antenna is mainly introduced. First, EM evaluation problem recast as a vector regression problem, and then SVR used to find an alternative model microstrip instead full-wave (FW) simulation tool. With geometry, frequency chemical potential input reflection coefficient output, next generation was estimated by using through learning...
This paper studies the multiple events character of pedestrian platoon with technique video analysis. Meanwhile, applying K-means cluster, we select three criterions which are average speed, width and length platoon, crossing process was divided into at signalized intersections. The application cluster analysis in division proved through case study, it reflected phased characteristics platoon.
According to the characteristics of bicycle traffic flow, green time is divided into maximum queue dissipation and cluster center running opposite lane, formulas are given respectively in this paper. Validation done based on intersection data Beijing city Tianjin city. Results show that calculated by considering meets interval bicycles passing through intersection, which enriches signal timing algorithm at signalized intersection.
This paper presents a simple identifying method of bike group ,then takes bicycle groups signalized intersection as the research object, investigations and video cameras are carried out at two intersections in Beijing Tianjin city. For data analysis,by using K-means cluster analysis ,this selects three criterions which average speed group,the width length group. Based on indexes , passing stage city divided into stages :the first for gradually spreading ,the second expanding third...