Yuanyuan Li

Chongqing Airport

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Wenxing Li

University of Science and Technology Beijing

Yiwei Ma

Harbin Engineering University

Tao Geng

Harbin Engineering University

Ping Zhang

Central South University

Jixin Liu

Nanjing University of Posts and Telecommunications

Shuren Zhang

University of Electronic Science and Technology of China

Zhigang Li

University of Hong Kong

Guodong Han

China Electronics Technology Group Corporation

Jun Li

Xi'an Jiaotong University

Chunbo Su

Harbin Engineering University

Cooperative Institutions

Harbin Engineering University

Chinese Academy of Sciences

Central South University

Wuhan University of Technology

Shanghai University

University of Chinese Academy of Sciences

South China University of Technology

Xiangya Hospital Central South University

Harbin Institute of Technology

Anhui University

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The application technology of warm mix of ultra-thin cover face in urban road maintenance

CRC Press eBooks (2012)

Yuanyuan Li Xiaoyan Song Sun Jian-yong Yapeng Zhang Yanchun Li

10.1201/b13165-29

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Robust adaptive null broadening beamforming based on subspace projection

International Journal of Electronics (2021)

Bin Yang Wenxing Li Yuanyuan Li Qi Zhang

When the rapid moving interference exists, especially in the presence of look direction mismatch, coherent local scattering and so on, the output performance of beamformer will degrade dramatically. To solve this problem, a novel robust adaptive null broadening beamforming method based on subspace projection is proposed. First, the proposed beamformer requires a priori information, that is, the spatial sector where the desired signal and interference may locate, so as to construct the signal-plus-noise covariance matrix (SPNCM) and interference-plus-noise covariance matrix (IPNCM). Then, the desired signal steering vector (SV) is calibrated twice. The desired signal SV is estimated from the SPNCM and subsequently calibrated by using the uncertainty set optimisation method. Next, we construct the null broadening projection matrix by tapering the interference subspace got from IPNCM. Finally, the sample covariance matrix is processed by projection technology and diagonal loading technology. The optimal weight vector is obtained by the new covariance matrix and calibrated desired signal SV. Simulation results show that the proposed method can form wide null in the incident direction of interference and prevent interference from moving out of the null when the rapid moving interference exists. The proposed method outperforms other existing methods.

Adaptive beamformer

Null (SQL)

Signal subspace

10.1080/00207217.2021.2024608

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Citations (3)

75‐4: Inkjet‐Printed Quantum Dot Display with Blue OLEDs for Next Generation Display

SID Symposium Digest of Technical Papers (2019)

Zhiping Hu Shijie Zhang Wenxiang Peng Shuren Zhang Yuanyuan Li

Colloidal quantum dot (QD) display is expected to be a promising technology for the next generation display due to the advantages of QDs. In this work, we fabricated 6.6 inch QD display panel by inkjet printing technology, being cooperated with active matrix organic light emitting diodes (AMOLEDs). Here 3‐stack blue OLEDs (BOLEDs) with top‐emission structure acted as backlight and red QD layer acted as converted materials, which exhibited high quantum efficiency, high luminance, high color purity and improved wide viewing angle of output emission. We believe that inkjet‐printed QD display with AMOLEDs would be promising candidate for the next generation display and lighting in the near future.

Backlight

Flat panel display

Flat panel

Full color

Viewing angle

Plasma display

LED display

10.1002/sdtp.13114

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Citations (15)

A Cooperated Design of Radiator and Radome for Wideband and Wide-Angle Scanning Phased Arrays

2022 International Conference on Microwave and Millimeter Wave Technology (ICMMT) (2021)

Jie Wu Songtao Liu Yuanyuan Li Guodong Han

A printed folded dipole antenna cooperated with an antenna radome for reducing the antenna profile and improving the scanning angles is proposed for phased arrays. The radome is used as the superstrate of the dipole radiator and they are considered as a whole part electronically and physically. Numerical calculations reveal that a bandwidth of 21% can be achieved in terms of the VSWR of each element smaller than 2.5. The scanning loss is less than 2dB within the angles of ±45° at the E-plane or H-plane.

Radome

10.1109/icmmt52847.2021.9618082

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A blind watermarking of vector graphics images

Yuanyuan Li Luping Xu

A blind algorithm for watermarking of vector map is presented in this paper. Only the magnitude of the DWT coefficients of vertices extracted from the map is altered to embed the watermark. Watermark can be extracted without original image because the embedding procedure is based on the relationship between the watermark value and the DWT coefficients. Experiment results show that this algorithm is robust to some image processing operations.

Vector graphics

Vector map

10.1109/iccima.2003.1238163

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Citations (28)

A High Selectivity, Miniaturized, Low Profile Dual-Band Bandpass FSS with a Controllable Transmission Zero

International Journal of Antennas and Propagation (2017)

Wenxing Li Yuanyuan Li

A novel, highly selective, low profile dual-band, and bandpass miniaturized-element frequency selective surface is proposed to realize stable angular responses and a controllable transmission zero. This FSS is a three-layer structure consisting of three metal layers that are separated from each other by two dielectric substrates. The equivalent circuit model of the FSS and its operating principle are presented and analyzed based on the microwave filter theory. The prototype of this FSS is simulated, fabricated, and measured, and its theoretical analysis, simulation, and measurement results show a good agreement. This FSS has achieved an excellent angular stability and wide out-of-band rejection performance in the scope of incidence angle of 80 degrees. Compared with the other multilayered FSSs and 3D FSSs proposed in previous works, it possesses a lower profile as well as a smaller size. A transmission zero is produced by etching slots on the edges of the middle metal layer to achieve superior frequency selectivity. By properly choosing the size and direction of the slots, the transmission zero and the polarization selectivity are able to be changed, respectively.

Selective surface

Multi-band device

Radome

10.1155/2017/7983567

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Citations (11)

2型糖尿病患者における上昇した血清乳脂肪小球‐上皮成長因子8レベルは過体重または肥満状態により抑制される【Powered by NICT】

IUBMB Life (2017)

Yuanyuan Li Ran Wenzhuo Jiaqiang Zhang Shi Chen Yihang Li

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A dual-band antenna designed for 5G communication based on a self-decoupled antenna

Rongzhen Fang Xianliang Wu Zhipeng Chen Mengying Dong Yunfeng Hu

In this paper, a dual-band antenna for 5G communication based on an antenna design with self-decoupling properties is introduced.The antenna is composed of a self-decoupled antenna unit vertically placed on an 30×80 mm ² ground plane and printed on 0.8 mm thick FR-4(εr = 4.4, tanδ = 0.02) substrate,and then added a pair of L-shaped coupling feeder structures on this basis.Simulation shows that the antenna has two operating frequency bands of 3.3-4.2GHz and 4.8-5GHz, and has good transmission and isolation in the above two operating frequency bands.Besides,it also has the advantages of small size, self-decoupling,high isolation,simple structure and easy processing.The antenna can be used as 5G mobile phone communication antenna unit.

Decoupling (probability)

10.1109/aces-china56081.2022.10064995

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Structural design exploration in new type bulbous bow of navel ship

Yuanyuan Li

This paper explores structural design on new type bulbous bow of navel ship starting from material selection,studies the requirements in structural and acoustic performances of the new type bulbous bow and presents excellent structural proposal of bulbous bow for the construction and consequent development of the new type bulbous bow of navel ship.

Bow tie

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A long-term target detection approach in infrared image sequence

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

Hang Li Qi Zhang Yuanyuan Li Liqiang Wang

An automatic target detection method used in long term infrared (IR) image sequence from a moving platform is proposed. Firstly, based on non-linear histogram equalization, target candidates are coarse-to-fine segmented by using two self-adapt thresholds generated in the intensity space. Then the real target is captured via two different selection approaches. At the beginning of image sequence, the genuine target with litter texture is discriminated from other candidates by using contrast-based confidence measure. On the other hand, when the target becomes larger, we apply online EM method to iteratively estimate and update the distributions of target's size and position based on the prior detection results, and then recognize the genuine one which satisfies both the constraints of size and position. Experimental results demonstrate that the presented method is accurate, robust and efficient.

Sequence (biology)

Position (finance)

10.1117/12.2203718

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