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Wind turbine clutter mitigation using morphological component analysis with group sparsity

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Journal of Systems Engineering and Electronics 2023年第3期34卷 714-722页

作者： wan Xiaoyu SHEN mingwei wu Di ZHU Daiyin College of Computer and Information Hohai UniversityNanjing 211100China Key Laboratory of Radar Imaging and Microwave Photonics&Ministry of Education Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To address the problem that dynamic wind turbine clutter(WTC)significantly degrades the performance of weather radar,a WTC mitigation algorithm using morphological component analysis(MCA)with group sparsity is studied in this *** ground clutter is suppressed firstly to reduce the morphological compositions of radar *** that,the MCA algorithm is applied and the window used in the short-time Fourier transform(STFT)is optimized to lessen the spectrum leakage of ***,the group sparsity structure of WTC in the STFT domain can be utilized to decrease the degrees of freedom in the solution,thus contributing to better estimation performance of weather *** effectiveness and feasibility of the proposed method are demonstrated by numerical simulations.

关键词： weather radar wind turbine clutter(WTC) morphological component analysis(MCA) short-time Fourier transform(STFT) group sparsity

Placement of unmanned aerial vehicles as communication relays in two-tiered multi-agent system:clustering based methods

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Journal of Systems Engineering and Electronics 2020年第2期31卷 231-242页

作者： wu Gaofeng wan Kaifang GAO Xiaoguang FU Xiaowei School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China

The network performance and the unmanned aerial vehicle(UAV)number are important objectives when UAVs are placed as communication relays to enhance the multi-agent information *** problem is a non-deterministic polynomial hard(NP-hard)multi-objective optimization problem,instead of generating a Pareto solution,this work focuses on considering both objectives at the same level so as to achieve a balanced solution between *** on the property that agents connected to the same UAV are a cluster,two clustering-based algorithms,M-K-means(MKM)and modified fast search and find density of peaks(MFSFDP)methods,are first *** the former algorithm requires too much computational time and the latter one requires too many relays,an algorithm for the balanced network performance and relay number(BPN)is proposed by discretizing the area to avoid missing the optimal relay positions and defining a new local density function to reflect the network performance *** results demonstrate that the proposed algorithms are feasible and *** between these algorithms show that the BPN algorithm uses fewer relay UAVs than the MFSFDP and classic set-covering based algorithm,and its computational time is far less than the MKM algorithm.

关键词： unmanned aerial vehicle(UAV) relay communication clustering relay node placement wireless network

Breeding with dominant genic male-sterility genes to boost crop grain yield in the post-heterosis utilization era

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Molecular Plant 2021年第4期14卷 531-534页

作者： Xiangyuan wan Suowei wu Xiang Li Zhongzhi International Institute of Agricultural Biosciences Biology and Agriculture Research Center of USTBUniversity of Science and Technology Beijing(USTB)Beijing 100024China Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding Beijing International Science and Technology Cooperation Base of Bio-Tech BreedingBeijing Solidwill Sci-Tech Co.Ltd.Beijing 100192China

APPLICABLE CROP DGMS TECHNOLOGY IN THE POST-HETEROSIS UTILIZATION ERA,The global population is predicted to grow by 25%and reach 10 billion by the mid-21st century(Hickey et al.,2019).To meet the food demands of the growing population with limited agricultural land and fresh water resources,greater and more consistent crop production under fluctuating climate conditions,including various environmental stresses,must be achieved by reducing resource inputs and minimizing environmental impacts(Bailey-Serres et al.t 2019).Thanks to the extensive use of semi-dwarf Green Revolution varieties and single-cross hybrids of major crops(e.g.,rice and maize),grain yield has increased steeply over the past 60 years(Figure 1A and 1B).For example。

关键词： crops dwarf grain

A Personalized Comprehensive Cloud-Based Method for Heterogeneous MAGDM and Application in COVID-19

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Computer Modeling in Engineering & Sciences 2022年第6期131卷 1751-1792页

作者： Xiaobing Mao Hao wu Shuping wan School of Information Management Jiangxi University of Finance and EconomicsNanchang330013China

This paper proposes a personalized comprehensive cloud-based method for heterogeneous multi-attribute groupdecision-making (MAGDM), in which the evaluations of alternatives on attributes are represented by LTs (linguisticterms), PLTSs (probabilistic linguistic term sets) and LHFSs (linguistic hesitant fuzzy sets). As an eective toolto describe LTs, cloud model is used to quantify the qualitative evaluations. Firstly, the regulation parameters ofentropy and hyper entropy are dened, and they are further incorporated into the transformation process from LTsto clouds for reecting the dierent personalities of decision-makers (DMs). To tackle the evaluation informationin the form of PLTSs and LHFSs, PLTS and LHFS are transformed into comprehensive cloud of PLTS (C-PLTS)and comprehensive cloud of LHFS (C-LHFS), respectively. Moreover, DMs’ weights are calculated based on theregulation parameters of entropy and hyper entropy. Next, we put forward cloud almost stochastic dominance(CASD) relationship and CASD degree to compare clouds. In addition, by considering three perspectives, acomprehensive tri-objective programing model is constructed to determine the attribute weights. Thereby, apersonalized comprehensive cloud-based method is put forward for heterogeneous MAGDM. The validity ofthe proposed method is demonstrated with a site selection example of emergency medical waste disposal inCOVID-19. Finally, sensitivity and comparison analyses are provided to show the eectiveness, stability, exibilityand superiorities of the proposed method.

关键词： Heterogeneous MAGDM regulation parameter C-PLTS C-LHFS CA

Representation of the ENSO Combination Mode and its Asymmetric SST Response in Different Resolutions of HadGEM3

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Advances in Atmospheric Sciences 2018年第8期35卷 167-180页

作者： Jianghua wan Hongli REN Peili wu Laboratory for Climate Studies and CMA-NJU Joint Laboratory for Climate Prediction Studies National Climate Center China Meteorological Administration Beijing 100081 China Department of Atmospheric Sciences School of Environment Studies University of Geoscience Wuhan 430074 China Met Office Hadley Center Exeter EX1 3PB UK

Previous studies have revealed a combination mode （C-mode） occurring in the Indo-Pacific region, arising from nonlinear interactions between ENSO and the western Pacific warm pool annual cycle. This paper evaluates the simulation of this C-mode and its asymmetric SST response in HadGEM3 and its resolution sensitivity using three sets of simulations at horizontal resolutions of N96, N216 and N512. The results show that HadGEM3 can capture well the spatial pattern of the C-mode associated surface wind anomalies, as well as the asymmetric response of SST in the tropical Pacific, but it strongly overestimates the explained variability of the C-mode compared to the ENSO mode. The model with the three resolutions is able to reproduce the distinct spectral peaks of the C-mode at the near annual combination frequencies, but the performance in simulating the longer periods is not satisfactory, presumably due to the unrealistic simulation of the ENSO mode. Increasing the horizontal resolution can improve the consistency between atmospheric and oceanic representations of the C-mode, but not necessarily enhance the accuracy of C-mode simulation compared with observation.

关键词： ENSO combination mode asymmetric response Nifio-A index HadGEM3 horizontal resolution

Multi-scale analysis of void evolution in large-section plastic mold steel during multi-directional forging

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Journal of Iron and Steel Research International 2022年第12期29卷 1961-1977页

作者： Xuan Chen Bo-ya wu Bo-liang wu Xiao-chun wu Jun-wan Li School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The void evolution of large-section plastic mold steel during multi-directional forging(MDF)was investigated using multiscale *** simulate the forging process of the plastic mold steel(SDP1 steel)and realize micro-void reconstruction in a representative volume element(RVE),MDF experiment and void-characteristic evaluation of the SDP1 steel were carried *** upsetting and stretching forging(TUSF)and MDF were simulated to comparatively analyze the evolution of temperature,effective stress,and effective *** embedding RVE with a micro-void and using boundary condition by point tracking into the forging process,the single-void evolution in TUSF and MDF was *** effect of void orientation on single-void evolution was also *** multi-scale analysis revealed the following results.(1)Compared with TUSF,MDF achieved a higher efficiency in void closure.(2)The closing efficiency of the void increased with the increase in angle h(the angle between the Z and long axes of the void).(3)The closing efficiency increased with the increase in the orientation angle during the forging *** the basis of the important role of the main stress in each forging step on the void closure,an integral formula of the main stress was *** main compressive-stress integration reached-0.4,the closed state of the void could be accurately determined.

关键词： Plastic mold steel Multi-directional forging Multi-scale analysis Representative volume element Void

EBCache:A Novel Cache-Based Mechanism for Mitigating the Spectre Attacks for RISC-V Processor

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China Communications 2024年第12期21卷 166-185页

作者： wu Dehua Xiao wan’ang Gao wanlin Key Laboratory of Agricultural Informatization Standardization Ministry of Agriculture and Rural AffairsChina Agricultural UniversityBeijing 100083China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&School of Microelectronics University of Chinese Academy of SciencesBeijing 100049China

The cache-based covert channel is one of the common vulnerabilities exploited in the Spectre *** mitigation strategies focus on blocking the eviction-based channel by using a random/encrypted mapping function to translate memory address to the cache address,while the updated-based channel is still *** addition,some mitigation strategies are also costly as it needs software and hardware *** this paper,our objective is to devise low-cost,comprehensive-protection techniques for mitigating the Spectre *** proposed a novel cache structure,named EBCache,which focuses on the RISC-V processor and applies the address encryption and blacklist to resist the Spectre *** addresses encryption mechanism increases the difficulty of pruning a minimal eviction *** blacklist mechanism makes the updated cache lines loaded by the malicious updates *** experiments demonstrated that the EBCache can prevent malicious *** EBCache,however,reduces the processor’s performance by about 23%but involves only a low-cost modification in the hardware.

关键词： cache structure out-of-order execution side-channel attacks the Spectre attacks

Calculation method of ship collision force on bridge using artificial neural network

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 614-623页

作者： Wei FAN wan-cheng YUAN Qi-wu FAN State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Department of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Ship collision on bridge is a dynamic process featured by high nonlinearity and instantaneity. Calculating ship-bridge collision force typically involves either the use of design-specification-stipulated equivalent static load, or the use of finite element method (FEM) which is more time-consuming and requires supercomputing resources. In this paper, we proposed an alternative approach that combines FEM with artificial neural network (ANN). The radial basis function neural network (RBFNN) employed for calculating the impact force in consideration of ship-bridge collision mechanics. With ship velocity and mass as the input vectors and ship collision force as the output vector, the neural networks for different network parameters are trained by the learning samples obtained from finite element simulation results. The error analyses of the learning and testing samples show that the proposed RBFNN is accurate enough to calculate ship-bridge collision force. The input-output relationship obtained by the RBFNN is essentially consistent with the typical empirical formulae. Finally, a special toolbox is developed for calculation efficiency in application using MATLAB software.

关键词： Ship-bridge collision force Finite element method (FEM) Artificial neural network (ANN) Radial basis function neural network (RBFNN)

Synergetic effect of TeMo_5O_(16) and MoO_3 phases in MoTeO_x catalysts used for the partial oxidation of propylene

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Journal of Natural Gas Chemistry 2011年第3期20卷 249-255页

作者： Yiming He Ying wu Weizheng Weng Huilin wan Department of Materials Physics Zhejiang Normal University Jinhua 321004 Zhejiang China State Key Laboratory for Physical Chemistry of the Solid Surfaces Xiamen University Xiamen 361005 Fujian China Institute of Physical Chemistry Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Zhejiang Normal University Jinhua 321004 Zhejiang China

A detailed study on the synergetic effect of TeMo5O16 and MoO3 phases in the MoTeOx catalysts for the partial oxidation of propylene to acrolein has been reported in this work. It was found that both propylene conversion and acrolein selectivity increased with the addition of MoO3 to TeMo5O16. Based on the results of N2 adsorption-desorption, XRD, XPS, in-situ XRD, O2-TPO, and 2-propanol decomposition reaction, the higher catalytic performance and synergetic effect could be attributed to the enhancement of acidity and the oxygen transfer from TeMo5O16 to MoO3 phase.

关键词： synergy TeMO5O16 MoO3 acidity oxygen transfer