Yanan Liu

Beijing University of Technology

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New Velocity Dealiasing of Doppler Radar with the Interactive Method

Ming Wei Yanan Liu Jiawen Pan Nan Li

Doppler weather radar plays an important role for detecting and forecasting severe weather, it could probe atmosphere with high spatial and temporal resolutions. Because Doppler velocity ambiguity disturbs target recognition and data application, a lot of work focuses on velocity dealiasing. This research tries to study a new interactive method for unfolding the velocity ambiguity with the computer graphic function, which is quite different from the previous unfolding methods. The positive and negative areas of radial velocity are distinguished by zero velocity line in the radial velocity field which is easy to do with human's experience, then unfold process has been made in the selected area. This method needs not any extrapolation and hypothesis, could deal with one and more times velocity ambiguity. The result shows this unfold method is convenient and fast, and corrected information accuracy is ensured.

Radial velocity

Weather radar

Ambiguity function

10.1109/csie.2009.840

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Engineering practice of surface grouting treatment through soft surrounding rock stratum by TBM

IOP Conference Series Earth and Environmental Science (2018)

Xiaochen Wang Guo Yanxv Weiwei Han Yanan Liu Honglu Yang

When the TBM passes through the weak and broken strata, it is easy to get stuck and be buried. Through the advance pre grouting engineering practice of TBM crossing fault zone in Qingdao area, the pre grouting reinforcement measures for preventing the occurrence of TBM card machine are explored, including grouting pressure, grouting drilling design, grouting material and other key parameters. The research results show that the surface pre grouting method is an effective grouting measure to prevent the occurrence of TBM stuck and buried accidents. Single cement slurry and C-S double slurry are used as grouting materials. The cement slurry is used to fill the void in soft broken stratum and C-S double slurry is used to improve the controllability of slurry diffusion. In the process of advanced pre-grouting construction on the ground surface, the application of progressive segmental grouting technology and membrane bag sealing grouting technology can effectively guarantee the strengthening range of soft ground and improve the effect of grouting reinforcement.

Stratum

Grout

10.1088/1755-1315/189/2/022059

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New LTE downlink CQI correction algorithm

Xun Yuan Yanan Liu Xinxing Jing Bing Han

In order to adapt channel variation and maximize throughput performance, Adapt Modulation and Coding (AMC) is used in Long-Term Evaluation (LTE) downlink. However, due to the wireless channel random variation, inaccurate reported Channel Quality Indicator (CQI) is introduced, which will affect quality of data transmission. Therefore, it is necessary to modify reported CQI in AMC process. Although this paper adopts a traditional CQI correction algorithm, it ignores the influence of great deviation and burst noise. To overcome these shortages, an improved CQI correction algorithm which is based on the traditional method is proposed. The new algorithm is not only depend on acknowledge of data blocks but also depend on previous modified CQI to correct current reported CQI. The performance of two CQI correction algorithm based on both perfect noise power estimation and real noise power estimation are simulated in a LTE downlink platform. By comparing these results, it can be conclude that performance of new CQI correction algorithm is better when the terminal moving in the high-speed channel model ETU300.

10.1109/icct.2013.6820365

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Self-Adaptive Dragonfly Optimizer with Random Forest and Kernel Principal Component Analysis for Complex Optimization Problems

2021 China Automation Congress (CAC) (2024)

Ziqi Wang Bo Yu Huizhong Yang Yanan Liu Jiahui Zhai

Component (thermodynamics)

Kernel (algebra)

10.1109/cac63892.2024.10865278

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A High-Order Model for Fast Estimation of Electromagnetic Absorption Induced by Multiple Transmitters in Portable Devices

IEEE Transactions on Antennas and Propagation (2017)

Jian Li Su Yan Yanan Liu Bertrand M. Hochwald Jian‐Ming Jin

In the development of 5G communication systems, multiantenna transmitting architectures and millimeter-wave operating frequency bands are effective ways to improve the communication data rate. In order to estimate the electromagnetic exposure under multiantenna transmitters installed in portable devices working in long-term evolution (LTE) and millimeter-wave bands, this paper generalizes a low-order model to higher orders based on the Fourier series expansion for a fast and accurate evaluation and prediction of electromagnetic absorption (EA) as a function of the phase difference among multiple transmitters. Several numerical and experimental examples are given to demonstrate the effectiveness of the proposed high-order model in multiple LTE, 5G, and millimeter-wave communication bands. With the excellent capability of calculating and predicting EA with a low error, this high-order model can be used to improve the bio-electromagnetic performances of multiantenna portable devices when combined with other communication technologies.

Extremely high frequency

Specific absorption rate

Electromagnetic simulation

10.1109/tap.2017.2728090

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Citations (16)

An Improved HF Channel Wideband Detection Method Based on Scattering Function

Lecture notes in computer science (2020)

Lantu Guo Yanan Liu Wenxin Li

Wideband

10.1007/978-3-030-57884-8_28

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Defect Detection of Solar Panel Based on DenseNet Network

Advances in transdisciplinary engineering (2023)

Xiaoyu Song Yanan Liu

At different stages of solar panel production, there may be shadows, microcracks and other defects. This will have a influence on the conversion efficiency of turning light energy into electric energy of the battery. For the sake of enhancing the efficiency of solar cell, it is certainly worth detecting the defects of the battery. For the sake of accurately detecting the defects of solar panels, a detection method based on Dense U-Net is came up with. This method can prevent the problem of gradient from disappearing in the process of feature transfer by introducing dense connection network. The results show that this method can produce good results in defect detection.

Feature (linguistics)

10.3233/atde230093

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Scattered point cloud simplification algorithm based on FPFH and FPS

Thirteenth International Conference on Graphics and Image Processing (ICGIP 2021) (2022)

Haipeng Li Dan Xu Yuting Fu Yanan Liu Jixiong Ma

3D point cloud simplification is an important pre-processing task in geometric reconstruction to save computer resources and increase reconstruction speed. Compared with traditional methods, the existing point cloud simplification algorithm based on k-means has a better effect on the extraction and retention of feature points, while there will be many larger holes near the feature points. In this paper, we propose a scattered point cloud simplification algorithm (SPSA). The SPSA strikes a balance between retaining enough feature points and keeping the sample points evenly distributed. The SPSA uses boundary search and the fast point feature histogram to extract feature points. Further, we apply the improved farthest point sampling algorithm to sample non-feature regions to ensure the integrity of the simplified model. Extensive experiment results on standardized information entropy evaluation show that the SPSA outperforms other simplification algorithms. In addition, the visualization results indicate that the proposed method can ensure the integrity of the simplified model and retain the most of feature information of the point cloud.

Feature (linguistics)

10.1117/12.2623150

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Solving nonlinear singular boundary value problems using a newly constructed scaling function

The 8th International Conference on Computational Methods (ICCM2017) (2017)

Yanan Liu

In this paper, a scaling function constructed using special filter coefficients is used for solution of nonlinear singular boundary value problems. The basis functions in interval originated from the newly constructed scaling function are used in function approximation, Galerkin method and iteration approach are used for solution. Some numerical examples are given to demonstrate the validity of the technique. Numerical results prove that the new basis functions have good approximation ability and the present method is very efficient and highly accurate in solving nonlinear singular boundary value problems.

Basis function

Basis (linear algebra)

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Analog design of magnetic resonance imaging principle

Chinese Medical Equipment Journal (2006)

Yanan Liu

By using VB program and FLASH making technique,the forming principle of electrocardiogram is vividly displayed,so that the students can understand it well.

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