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30 results on '"Zheng, Hang"'

5. ORSI Salient Object Detection via Cross-Scale Interaction and Enlarged Receptive Field.

Author

Zheng, Jianwei, Quan, Yueqian, Zheng, Hang, Wang, Yibin, and Pan, Xiang

Abstract

Due to the diversity of scales and shapes, the uncertainty of object position, and the complexity of edge details, the recent merging problem of salient object detection in optical remote sensing image (RSI-SOD) is a considerably challenging topic. To cope with the challenges, we propose a new cross-scale interaction network (CIFNet) equipped with the enlarged receptive field, which mainly contains three modules in an encoder–decoder architecture, including a furcate skip connection module (FSCM), a global leading attention module, and an expansion–integration module (EIM). First, the FSCM uses dilated convolutions to enlarge the receptive field and furcate skip connections to capture more multiscale contextual information, both of which facilitate the adaptability of the model to different sizes, shapes, and quantities of the target objects. Second, on the low-resolution branch, a global leading attention module (GLM) locates the potentially significant object positions in the feature map from a global semantic perspective. Finally, through an attention-guided cascade structure, the EIM seeks more delicate characteristics by refining the features in a coarse-to-fine fashion. Extensive experiments are conducted on two RSI-SOD datasets, from which superior results can be achieved by our CIFNet, outperforming the other state-of-the-art methods. Compared with the second-best method, the performance gain of our method reaches 3.45% on mean absolute error (MAE) and 1.38% on $F_{\beta} ^{\mathrm {adp}}$. Notably, the proposed CIF-Net runs with 40.40-M parameters, 14.8-GFLOPs computational complexity, and 58-frames/s inference speed, which guarantees high efficiency. [ABSTRACT FROM AUTHOR]

Published
2023
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16. 2-D DOA Estimation for Coprime Cubic Array: A Cross-correlation Tensor Perspective

Author

Zhiguo Shi, Chengwei Zhou, Wang Yong, and Zheng Hang

Subjects
Cross-correlation, Coprime integers, Perspective (graphical), 0202 electrical engineering, electronic engineering, information engineering, Applied mathematics, 020206 networking & telecommunications, 02 engineering and technology, Tensor, Smoothing, Statistics::Computation, Mathematics
Abstract

In this paper, a cross-correlation coarray tensor-based 2-D direction-of-arrival (DOA) estimation method for coprime cubic array (CCA) is proposed. Since the CCA received signals characterized by two coprime tensors cannot be collectively shaped as a single tensor to operate auto-correlation, the cross-correlation is introduced to calculate the coarray tensor statistics of CCA. A Nyquist-matched 4-D coarray tensor is then obtained for 2-D DOA estimation, where the designed structured tensorization is applied without spatial smoothing. Simulation results verify the effectiveness of the proposed method.

Published
2021

17. Structured Tensor Reconstruction for Coherent DOA Estimation.

Author

Zheng, Hang, Zhou, Chengwei, Shi, Zhiguo, and Gu, Yujie

Subjects
HERMITIAN structures, MATRIX decomposition, COVARIANCE matrices
Abstract

Existing tensor-based coherent direction-of-arrival (DOA) estimation methods adopting spatial smoothing to decorrelate the coherent tensor statistics usually lead to a poor decorrelation performance. In this letter, we propose a structured tensor reconstruction method for two-dimensional coherent DOA estimation, which then avoids the inefficient spatial smoothing. In particular, after investigating the structural property of the four-dimensional incoherent covariance tensor, we propose a tensorial Hermitian Toeplitz mapping rule to reconstruct a structured covariance tensor from the rank-deficient coherent covariance tensor statistics. It is theoretically proved that, the reconstructed covariance tensor admits a decorrelated canonical polyadic model with a tensorial Hermitian Toeplitz structure, whose decomposition ensures a closed-form coherent DOA estimation. The effectiveness of the proposed method is verified by simulations. [ABSTRACT FROM AUTHOR]

Published
2022
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18. Two-dimensional DOA Estimation for Coprime Planar Array: A Coarray Tensor-based Solution

Author

Yujie Gu, Zheng Hang, Zhiguo Shi, and Chengwei Zhou

Subjects
Signal processing, Coprime integers, Underdetermined system, Computer science, Planar array, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Matrix (mathematics), 0203 mechanical engineering, 0202 electrical engineering, electronic engineering, information engineering, Tensor, Algorithm, Computer Science::Information Theory
Abstract

Coprime arrays can cope with the underdetermined case for direction-of-arrival (DOA) estimation. However, the popular matrix-based coarray signal processing approaches suffer performance loss on the underlying characteristics among the multi-dimensional signals. To address this problem, we propose a novel coarray tensor-based two-dimensional underdetermined DOA estimation method for coprime planar array in this paper, where both the multi-dimensional information of the received signals and the augmented coarray are effectively utilized. The received signal tensors of the coprime planar array are constructed by concatenating each snapshot, which are then transformed to an augmented uniform rectangular array statistics for extending the effective array aperture. Subsequently, the tensorization technique is adopted to increase the degrees-of-freedom of the proposed DOA estimation method, and a structured coarray tensor is optimized for super-resolution DOA estimation. The effectiveness of the proposed method is verified via simulation results.

Published
2020

20. Experimental Research on Grid-Connected Control System of DFIG with Uncertain Parameter

Author

Zheng Shi, LI Ze-Tao, Hao Zheng-hang, Tian Peng, and HE Jun-Xian

Subjects
Computer science, 020209 energy, Induction generator, 02 engineering and technology, Decoupling (cosmology), Grid, law.invention, Stator voltage, law, Control theory, Control system, 0202 electrical engineering, electronic engineering, information engineering, Grid connection, Doubly fed electric machine, Decoupling (electronics), Voltage
Abstract

A parameter-indetermined doubly-fed induction generator (DFIG) grid-connected control strategy is proposed. This strategy does not rely on accurate parameters for control compensation. Firstly, grid voltage and stator voltage are respectively oriented during grid connection control process. Applying constant voltage control to obtain compensation term of power decoupling control. Secondly, q-axis voltage error signal based on grid voltage orientation is used to correct stator voltage phase error caused by installation position of speed encoder. Finally, the effectiveness of grid-connected control strategy with uncertain parameter DFIG is verified by constructing a DFIG grid-connected experimental platform.

Published
2018

24. The multidirectional information fusion mobile health management technology

Author

Yang Liu and Zheng-hang Yan

Subjects
Telemedicine, Engineering, Health management system, business.industry, Decision tree, Cloud computing, Computer security, computer.software_genre, Identification (information), Information system, Key (cryptography), Cluster analysis, business, computer
Abstract

Mobile smart terminal has become an indispensable part of people's lives. The development of biological technology and electronic technology makes it possible to achieve physical sign information detection by using the healthy smart terminal. Smart terminals have strong communication ability, the compute processing ability, cloud data storage and powerful data mining ability. The integrated use of mathematical statistics, clustering, decision tree, neural network algorithm mining of massive data, find the key mode of common characteristics and identification. Healty Cloud services will save user's health statistical information and estimate the trend of a large number of users and then feedback to the public health information system, so as to support the public health information system, some of the seasonal, influenza, infectious diseases can be predicted in advance and prevented. It is conducive to the public security.

Published
2013

25. In-material measurement technique for brittle materials subjected to shock loading

Author

Xu Song-Lin, Wang Daorong, Zheng Hang, and Liu Yong-Gui

Subjects
Materials science, business.industry, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Structural engineering, Materials testing, Gauge (firearms), Shock (mechanics), Stress (mechanics), High Energy Physics::Theory, Brittleness, Impact loading, Particle velocity, Composite material, business, Strain gauge
Abstract

Two kinds of magnetic gauges, including electromagnetic particle velocity (EMV) gauge and a combined gauge composed of EMV gauge and electromagnetic (EM) stress gauge, are introduced to investigate the dynamic damage of brittle materials subjected to shock loading. The former is now used for the measurements of non-magnetic materials under pressure-shear impact loading. The latter one can be used in normal plate impact, and the experimental results with this gauge could be self-proofed. The preliminarily experimental results show that these techniques are satisfactory.

Published
2011

30. Fast Growth Processes of Buffer Layers for YBCO Coated Conductors on Biaxially-Textured Ni Tapes.

Author

Li, Yijie, Zhao, Zuncheng, Liu, Linfei, Ye, Qinghao, and Zheng, Hang

Subjects
EPITAXY, ANNEALING of metals, PULSED laser deposition, NICKEL metallurgy, CERIUM oxides, MICROSTRUCTURE, X-ray diffraction, SURFACES (Technology)
Abstract

Epitaxial growth of CeO2 buffer layers on biaxially textured (001) Ni tapes was studied using reel-to-reel pulsed laser deposition. Relationship between microstructure and deposition parameters was systematically studied in order to develop reliable long tape coating processes. Prior to buffer layer deposition, Ni tapes were in situ annealed in forming gas (97% argon + 3% hydrogen) under various pressures and tape speeds to accelerate reel-to-reel annealing processes. It was found that orientation and texture of CeO2 buffer layers were sensitive to deposition parameters. X-ray diffraction analyses showed that CeO2 buffer layers had pure (001) orientation at forming gas pressure of 5 mTorr and 700°C. Under optimized deposition conditions, highly (001) oriented CeO2 buffer layers have been achieved at a high tape speed of 20-50 m/h. In-lane texture of CeO2 buffer layers was 7 degree which was comparable to the value of Ni tapes. [ABSTRACT FROM AUTHOR]

Published
2009
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