A5015628923- Ocean Waves and Remote Sensing
- Radar Systems and Signal Processing
- Oceanographic and Atmospheric Processes
- Underwater Acoustics Research
- Ship Hydrodynamics and Maneuverability
- Advanced SAR Imaging Techniques
- Arctic and Antarctic ice dynamics
- Precipitation Measurement and Analysis
- Medical Image Segmentation Techniques
- Soil Moisture and Remote Sensing
- Surface Treatment and Residual Stress
- RNA and protein synthesis mechanisms
- Erosion and Abrasive Machining
- Industrial Vision Systems and Defect Detection
- Advanced Image and Video Retrieval Techniques
- RNA modifications and cancer
- DNA and Nucleic Acid Chemistry
- Advanced Chemical Sensor Technologies
- Wind and Air Flow Studies
- Image Retrieval and Classification Techniques
- Brain Tumor Detection and Classification
- Blind Source Separation Techniques
- Laser and Thermal Forming Techniques
- Maritime Navigation and Safety
- Innovative Educational Techniques
Guangdong Pharmaceutical University
2023-2025
Hangzhou Dianzi University
2024-2025
Sun Yat-sen Memorial Hospital
2025
Sun Yat-sen University
2025
Harbin Engineering University
2015-2024
Central South University
2022-2024
Southwest Petroleum University
2008-2022
Taizhou Vocational and Technical College
2022
ORCID
2020
Luoyang Normal University
2020
In marine radar target detection, sea clutter will cause a large number of missed alarms and false alarms, which affect the accuracy detection. order to suppress effectively, suppression detection algorithm image sequence based on spatio-temporal domain joint filtering is proposed in this paper. The method add link before detecting target. Firstly, transformed into three-dimensional frequency wavenumber by fast Fourier transform (3D-FFT), then spectrum obtained. According fact that obtained...
Abstract Riboswitches are regulatory elements found in the untranslated regions (UTRs) of certain mRNA molecules. They typically comprise two distinct domains: an aptamer domain that can bind to specific small molecules, and expression platform controls gene expression. work by undergoing a conformational change upon binding their ligand, thus activating or repressing genes downstream. This mechanism allows regulation response metabolites To systematically summarise riboswitch structures...
Aptamers, which are short, single‐stranded DNA or RNA, capable of binding to a wide array targets with exceptional selectivity. Those high affinity for theophylline have the potential serve as biosensors, crucial tracking levels in treatment respiratory conditions. Despite extensive structural characterization RNA aptamer, counterpart’s ligand‐recognition mechanism has remained unclear. Here, we elucidate aptamer’s ligand‐binding through high‐resolution crystal structures its complexes...
Aptamers, which are short, single‐stranded DNA or RNA, capable of binding to a wide array targets with exceptional selectivity. Those high affinity for theophylline have the potential serve as biosensors, crucial tracking levels in treatment respiratory conditions. Despite extensive structural characterization RNA aptamer, counterpart’s ligand‐recognition mechanism has remained unclear. Here, we elucidate aptamer’s ligand‐binding through high‐resolution crystal structures its complexes...
<title>Abstract</title> In the field of medical object detection, acquiring abundant high-quality data remains a critical challenge. To address this issue, we propose DABDM (Data Augmentation Based on Diffusion Model), semi-supervised detection framework that exploits diffusion models to enhance image datasets. Our approach generates large volume synthetic images, which are utilized for unsupervised training phase in learning, thereby mitigating reliance extensive labeled data. Experimental...
Since it is difficult to filter out the rainfall interference directly from X-band marine radar image, necessary detect whether collected image contains control quality of image. Aiming at problem recognition in images, a new detection method proposed by using principal component analysis (PCA) technology reduce dimensions and extract features images. Based on calculated distance between be tested known features, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, the application of emerging compressed sensing (CS) theory and geometric characteristics targets in radar images are investigated. Currently, signal detection algorithms based on CS require knowing prior knowledge sparsity target signals. However, practice, it is often impossible to know advance. To solve problem, a novel adaptive matching pursuit (SAMP) algorithm proposed. This executes task by updating support set gradually increasing approximate original signal. verify...
In this paper, the retrieving significant wave height from X-band marine radar images based on shadow statistics is investigated, since accuracy can not be seriously affected by environmental factors and method has advantage of without any external reference to calibrate. However, estimated image acquired at near-shore area ideal. To solve problem, effect water depth considered in theoretical derivation sea surface slope. And then, an improved algorithm which suitable for both deep shallow...
Currently, it is a hot research topic to retrieve the wave parameters by using X-band marine radar. However, rainfall noise usually exists in collected radar images, which seriously interferes with extraction of parameters. To reduce influence noise, zero-pixel percentage (ZPP) method widely used detect but detection accuracy limited, and selection threshold needs be further studied. Based on ZPP method, ratio zero intensity echo (RZE) for proposed this paper. The determined statistical...
In this paper, we consider retrieving individual wave components in a multi-directional sea model. To solve problem, currently and commonly used method is three-dimensional discrete Fourier transform (3D DFT) on the radar image sequence. However, uniform frequency wavenumber domain can not always strictly satisfy dispersion relation, spectral leakage both temporal spatial domains exists due to limited analysis area selected from an As result, DFT incurs undesirable error performance...
Currently, X-band marine radar images are commonly utilized to retrieve sea wave parameters. However, the image usually contains rainfall interference noise, which has an effect on inversion accuracy of To control quality when retrieving parameters, research detection is investigated in this paper. Based correlation characteristics clutter and difference coefficients between with without rain, a novel method proposed. By analyzing spatial temporal clutter, threshold proposed determined....
In this study, an energy spectrum (ES) algorithm is proposed to retrieve wind direction from <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</i> -band marine radar image sequences. This based on utilizing the occlusion area zero-pixel percentage distinguish rain-free and rain-contaminated data. And then images are detected discarded. The effect of radial attenuation in sequences modified by piecewise fitting technique. Wind determined...
As an important observation measure of ship surface wind field, the shipborne anemometer can provide continuous wind-field records, which plays role in combating ships, safe navigation and takeoff landing shipboard aircraft. When passes through superstructure hull, airflow field layout area becomes distorted, thus increases measurement errors parameters. However, this error be corrected using optimal estimation strategy, more reliably accurately evaluate changes field. In study, based on...
Recently, the development of satellite cloud image processing technology has become very quick; research aspects concentrate on judge type and classify mainly. These methods relate to subject category like pattern recognition etc; it one fields most quickly in technology. In image, texture is an important feature, since clear structure, computer analysis provide perfect future for study analyze all kinds image. Variational method a new segmentation recent years, which adapt modeling extract...
To control the quality of X-band marine radar images for retrieving information and improve inversion accuracy, research on rainfall detection from is investigated in this paper. Currently, difference correlation characteristic between rain-contaminated image rain-free utilized to detect rainfall. However, only coefficient at a position lagged azimuth utilized, statistical hard threshold adopted. By deeply investigating calculated images, can be used constitute feature vector (CCFV). Then,...
Using a controlled optical bias and balanced geometry, we propose new scheme for broadband terahertz detection by laser-gas interaction without high-voltage manipulation. Compared to the conventional scheme, common noise is reduced dynamic range as well signal-to-noise ratio are doubled. It provides simple alternative coherent detection. The influence of on waveform also investigated, evolution terahertz-induced second harmonic with probe delay further revealed. This will boost application...
The research on retrieving wave parameters from X-band marine radar images based the spectral analysis method is investigated in this paper. Since sea field not always homogeneous and stationary spatial temporal domain, especially coastal shallow water area, two-dimensional continuous wavelet transform (2D CWT) currently utilized to retrieve spectrum for improving inversion accuracy. Although concentrated around given wavenumber, CWT of original image spread out over a region. By deeply...
To suppress the influence of rainfall when extracting sea surface wind and wave parameters using X-band marine radar control quality collected image, it is necessary to detect whether image contaminated by rainfall. Since detection accuracy statistical characteristics methods (e.g., zero pixel percentage method high-clutter direction method) limited threshold difficult determine, machine learning support vector machine-based neural network algorithm) are select appropriate quantity data for...
Accurately distinguishing radar images, which might be affected by rainfall, could improve the accuracy of inversion wave parameters under x-band navigation radar. This is also great significance for construction maritime powers. In this paper, echo differential value image space domain studied. It was found that average data sea detection area significantly different between rainfall and non-rainfall. The distance half wavelength used calculation value. And taking mean within selected range...
In this study, a new method combining wave-number energy spectrum (WES) and Genetic algorithm-back propagation neural network (GA-BPNN) is proposed to retrieve the rainfall intensity level from rain-contaminated X-band marine radar image. Since of spatial can be reflected by distribution in wavenumber frequency domain, obtained WES divided into three segments (low, medium high segments), ratio each segment total calculated separately as characteristic parameters. Based on excellent...
The new sea surface wind direction from the X-band marine radar image is proposed in this study using a fast convergent gray-level co-occurrence matrix (FC-GLCM) algorithm. First, sampled directly without need for interpolation due to algorithm’s application of GLCM polar co-ordinate system, which reduces inaccuracy caused by transformation. An additional process then merge convergence method with optimized so that circular transition between rough and fine estimates acquired, resulting...