A5114310255- Energy Efficient Wireless Sensor Networks
- Advanced Antenna and Metasurface Technologies
- UAV Applications and Optimization
- Electromagnetic wave absorption materials
- Robotics and Sensor-Based Localization
- Metamaterials and Metasurfaces Applications
- Advanced Measurement and Detection Methods
- Optical Systems and Laser Technology
- Advanced MIMO Systems Optimization
- Infrared Target Detection Methodologies
- Wireless Networks and Protocols
- Energy Harvesting in Wireless Networks
- Antenna Design and Analysis
- Indoor and Outdoor Localization Technologies
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Antenna Design and Optimization
- Robotic Path Planning Algorithms
- Mobile Ad Hoc Networks
- Advanced Battery Technologies Research
- Distributed Control Multi-Agent Systems
- Advanced Vision and Imaging
- Advanced Sensor and Control Systems
- Direction-of-Arrival Estimation Techniques
- Fiber-reinforced polymer composites
East China University of Technology
2024-2025
Ningxia University
2024
Chinese Academy of Sciences
2024
Nanjing University of Aeronautics and Astronautics
2010-2024
Hunan Research Academy of Environmental Sciences
2024
Ministry of Industry and Information Technology
2019-2023
Beijing Institute of Aeronautical Materials
2012-2022
Tsinghua University
2012-2014
Three-dimensional reduced graphene oxide (3D-rGO) powders are synthesized and demonstrate remarkably enhanced microwave absorption in the S-band (2–4 GHz).
The introduction of unmanned aerial vehicle (UAV) makes low-power links face many new challenges in UAV-assisted wireless-sensor network (WSN). In this article, the spatial characteristics these are analyzed comprehensively, and applicability traditional link quality metrics models is evaluated. particular, differences between WSN those discussed, possible reasons for analyzed. To achieve goal, two UAVs working on different bands used three flight modes designed. Experimental results show...
Abstract Electrospun polyacrylonitrile (PAN)‐based carbon composite fibers embedded with magnetic nanoparticles have been developed as materials for electromagnetic wave absorption. The nanocomposite were prepared by electrospinning from a dispersion of magnetite (Fe 3 O 4 ) stabilized L ‐glutamic acid in solution PAN and N, N ‐dimethyl formamide. Fe ‐embedded nanofibers at 270°C air carbonized 800°C nitrogen. crystalline particle size about 7 nm, most which was reduced to C agglomerates up...
In this paper, we propose two localization methods using angle of arrival (AoA) information. We assume that nodespsila axis orientations are unknown. Therefore, all AoA measurements employed to calculate the differences different nodes viewed by third one. Distance between within communication range also utilized in first method. For second method, only information is required. As distance and accurate enough, problem can be formulated as a linear program (LP). Otherwise, introducing...
The heating and impact of arc droplet acting on the weld pool lead to transfer mass, heat, momentum, which affects dynamic behavior microstructure in P-GMAW process. In this paper, an image processing program is used extract characteristics transition high-speed photography. influence current waveform pressure quantitatively analyzed with different parameters. under conditions are further studied. internal relation parameters was expounded. results show that positively correlated pulse peak...
Ground target three-dimensional positions measured from optical remote-sensing images taken by an unmanned aerial vehicle play important role in related military and civil applications. The weakness of this system lies its localization accuracy being unstable efficiency low when using a single vehicle. In paper, novel multi–unmanned cooperative measurement method is proposed to overcome these issues. the stage, three or more vehicles simultaneously observe same ground acquire multiple...
Flying Ad Hoc Network (FANET) technology could provide efficient and reliable cooperative communication for Unmanned Aerial Vehicle (UAV) swarms. However, the high mobility of UAV will bring intermittent connection link rapid change network topology, which lead to failure traditional routing protocols in highly dynamic aerial environment. There are already some improvements these literature enable them adapt frequent changes topology. This paper provides a comprehensive survey such improved...
Optical axis pointing accuracy is an important index of airborne electro-optical (EO) platforms. In this work, we aim to correct the optical angle EO platform by digital compensation. First, a basic parameter model (BPM) error with clear physical significance established analyzing structure and source platform. Then, suppress nonlinear factors in error, propose improved algorithm semi-parametric regression based on BPM. Numerical simulation analysis shows that inherits advantages BPM, such...
One of the main methods for link quality prediction is to predict physical layer parameters first, and then evaluate based on mapping models between such packet reception ratio (PRR). However, existing often ignore temporal correlations parameter series rarely consider influence fluctuations, which lead more errors under moderate sudden changed links with larger fluctuations. In view these problems, this paper proposes a effective method RNN-LQI, adopts Recurrent Neural Network (RNN) Link...
Accurate battery state-of-charge (SOC) estimation is crucial to maximize the lifetime of wireless sensor networks (WSNs). Meanwhile, considering limited capability nodes, lightweight methods are preferred. Unfortunately, existing not satisfactory when facing rapidly changed loads. Moreover, their accuracy stable throughout whole lifetime. This article analyzes error variation theoretically and finds that these actually complementary in different stages discharge process. Therefore,...
The microwave absorption properties of sandwich structural absorbers based on the nanocrystalline strontium ferrite (SrFe12O19), NiZn (Ni0.5Zn0.5Fe2O4) and alpha-iron (alpha-Fe) hollow microfibers with diameters 1-3 microm have been investigated in frequency range 2-18 GHz. composed as outer or inner layer, alpha-Fe interlayer, strong a broad band thin thickness. Their GHz are mainly influenced by arrangement, each layer thickness total It finds that absorber 1.6 mm thick SrFe12O19 0.2...
Multichannel communication has great potential in environments with unknown interference patterns. However, existing link quality metrics and models are generally established verified under a single-channel scenario, which does not consider the impacts of radio channel change. Therefore, it is hard to directly judge whether these still valid multichannel scenario. This paper empirically analyzes applicability popular multiple channels different levels. Results show that estimation (LQE)...
Real-time and accurate packet reception rate estimation is crucial for wireless sensor networks. However, existing approaches usually rely on offline data collection training, which limits their generality. Specifically, models fitted by the test acquired under specific conditions cannot be used in all environments arbitrary sizes. In this paper, a simplification method theoretical bit error model of IEEE 802.15.4 2.4 GHz physical layer proposed, about 18 to 38 times faster than original...
In order to improve the target localization accuracy based on airborne electro-optical payload, a novel passive scheme is proposed. Firstly, cross algorithm according collinear equation derived. And then improved by repeatedly measuring same present, which can suppress effect of measurement error. The experimental results show that up 9.3m when aircraft flying in 800m. This method effectively precision localization, and it has important practical value.
The size of time windows used by low-power wireless protocols to compute packet reception ratio (PRR) directly affects the accuracy and agility link quality prediction. Using small would make prediction more agile, but its decreases seriously. To improve while maintaining agility, many existing methods generally predict physical layer parameters within first then calculate PRR using mapping models such PRR. However, due propagation characteristics signal, these usually introduce large...