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星地融合网络中基于Q学习的切换算法研究

通信学报 2015年第9期36卷 252-258页

作者：熊丹妮李屹北京邮电大学泛网无线通信教育部重点实验室北京100876

基于地面辅助基站(ATC)的星地融合网络(MSS-ATC)具有覆盖范围广、用户体验佳的特点,切换机制是该融合网络主要研究的问题之一。针对卫星链路时延大、卫星网用户速度范围广的特点,综合考虑了用户接收信号强度(RSS)和用户运动速度,提出了... 详细信息

基于地面辅助基站(ATC)的星地融合网络(MSS-ATC)具有覆盖范围广、用户体验佳的特点,切换机制是该融合网络主要研究的问题之一。针对卫星链路时延大、卫星网用户速度范围广的特点,综合考虑了用户接收信号强度(RSS)和用户运动速度,提出了一种基于卡尔曼滤波和Q学习的切换决策算法。比较了所提算法与传统算法在链路衰减率、切换次数和网络收益的性能,实验结果表明所提算法在性能上得到了很大的提升,并且能很好地适应高速运动状态。

关键词：切换 MSS-ATC RSS预测 Q学习

Compressed Identification By Sparse Sampled Frequency Data

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Compressed Identification By Sparse Sampled Frequency Data

The Short-Term Prediction ofWind Power Based on the Convolutional Graph Attention Deep Neural Network

第30届中国控制与决策会议

作者： dan xiong Li Chai Jingxin Zhang School of Information Science and Engineering Wuhan University of Science and Technology Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and Technology School of Software and Electrical Engineering Swinburne University of Technology

This paper considers the identification of a rational transfer function with sparse representation in pairs of FIR and Takenaka-Malmquist（TM） bases and from random sampled linear frequency-domain measurements. We firstly prove the uniqueness of the sparse representation of the transfer function represented in concatenated FIR and TM basis functions. Then we propose to reconstruct the unique representation coefficient vector by l1 minimization with sparse sampled frequency data on the upper unit circle. The simulations verify that the concatenated FIR and TM bases in the proposed identification framework can obtain a much sparser reconstruction with lower reconstruction order even with incomplete information of the system poles.

关键词： frequency domain identification sparse representation FIR basis TM basis l1 optimization

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Energy Engineering 2024年第2期121卷 359-376页

作者： Fan Xiao xiong Ping Yeyang Li Yusen Xu Yiqun Kang dan Liu Nianming Zhang State Grid Hubei Electric Power Research Institute Wuhan430077China College of Energy and Electrical Engineering Hohai UniversityNanjing210098China

The fluctuation of wind power affects the operating safety and power consumption of the electric power grid and restricts the grid connection of wind power on a large ***,wind power forecasting plays a key role in improving the safety and economic benefits of the power *** paper proposes a wind power predicting method based on a convolutional graph attention deep neural network with multi-wind farm *** on the graph attention network and attention mechanism,the method extracts spatial-temporal characteristics from the data of multiple wind ***,combined with a deep neural network,a convolutional graph attention deep neural network model is ***,the model is trained with the quantile regression loss function to achieve the wind power deterministic and probabilistic prediction based on multi-wind farm spatial-temporal data.A wind power dataset in the *** taken as an example to demonstrate the efficacy of the proposed *** with the selected baseline methods,the proposed model achieves the best prediction *** point prediction errors(i.e.,root mean square error(RMSE)and normalized mean absolute percentage error(NMAPE))are 0.304 MW and 1.177%,*** the comprehensive performance of probabilistic prediction(i.e.,con-tinuously ranked probability score(CRPS))is ***,the significance of multi-wind farm data and spatial-temporal feature extraction module is self-evident.

关键词： Format wind power prediction deep neural network graph attention network attention mechanism quantile regression

Adaptive Predefined-Time Backstepping Control for Grid Connected Photovoltaic Inverter

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Energy Engineering 2024年第8期121卷 2065-2083页

作者： Jiarui Zhang dan Liu Kan Cao Ping xiong Xiaotong Ji Yanze Xu Yunfei Mu Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin300072China State Grid Hubei Electric Power Research Institute Wuhan430077China State Grid Hubei Electric Power Co. Ltd.Wuhan430077China

The system performance of grid-connected photovoltaic(PV)has a serious impact on the grid *** improve the control performance and shorten the convergence time,a predefined-time controller based on backstepping technology and dynamic surface control is formulated for the inverter in the grid-connected *** time-varying tuning functions are introduced into state-tracking errors to realize the predefined-time control *** address the“computational explosion problem”in the design process of backstepping control,dynamic surface control is adopted to avoid the analytical calculations of virtual *** disturbances of the PV system are estimated and compensated by adaptive *** control parameters are chosen and the global stability of the closed-loop is ensured by Lyapunov *** results confirm the effectiveness of the proposed controller and ensure the predefined time control in the photovoltaic inverter.

关键词： Photovoltaic inverter system backstepping technology predefined-time control adaptive control

Metal–Organic Gel Leading to Customized Magnetic‑Coupling Engineering in Carbon Aerogels for Excellent Radar Stealth and Thermal Insulation Performances

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Nano-Micro Letters 2024年第3期16卷 36-52页

作者： Xin Li Ruizhe Hu Zhiqiang xiong dan Wang Zhixia Zhang Chongbo Liu Xiaojun Zeng Dezhi Chen Renchao Che Xuliang Nie Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Environmental and Chemical Engineering Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials and Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200438People’s Republic of China School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People’s Republic of China College of Chemistry and Materials Jiangxi Agricultural UniversityNanchang 330045People’s Republic of China

Metal–organic gel(MOG)derived composites are promising multi-functional materials due to their alterable composition,identifiable chemical homogeneity,tunable shape,and porous ***,stable metal–organic hydrogels are prepared by regulating the complexation effect,solution polarity and curing ***,collagen peptide is used to facilitate the fabrication of a porous aerogel with excellent physical properties as well as the homogeneous dispersion of magnetic particles during ***,two kinds of heterometallic magnetic coupling systems are obtained through the application of Kirkendall ***/nitrogen-doped carbon(NC)aerogel demonstrates an ultra-strong microwave absorption of−85 dB at an ultra-low loading of 5%.After reducing the time taken by atom shifting,a FeCo/Fe3O4/NC aerogel containing virus-shaped particles is obtained,which achieves an ultra-broad absorption of 7.44 GHz at an ultra-thin thickness of 1.59 mm due to the coupling effect offered by dual-soft-magnetic ***,both aerogels show excellent thermal insulation property,and their outstanding radar stealth performances in J-20 aircraft are confirmed by computer simulation *** formation mechanism of MOG is also discussed along with the thermal insulation and electromagnetic wave absorption mechanism of the aerogels,which will enable the development and application of novel and lightweight stealth coatings.

关键词： Metal-organic gels Heterometallic magnetic coupling Radar stealth Thermal insulation Computer simulation technology

Comprehensive profiling of EBV gene expression in nasopharyn- geal carcinoma through paired-end transcriptome sequencing

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Frontiers of Medicine 2016年第1期10卷 61-75页

作者： Lijuan Hu Zhirui Lin YanhengWu Juqin Dong Bo Zhao Yanbing Cheng Peiyu Huang Lihua Xu Tianliang Xia dan xiong Hongbo Wang Manzhi Li Ling Guo Elliott Kieff YixinZeng State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine and Department of Experimental Research Sun Yat-sen University Cancer Center Guangzhou 510060 China First Affiliated Hospital of Jinan University Guangzhou 510630 China Department of Nasopharyngeal Carcinoma Sun Yat-sen University Cancer Center Guangzhou 510060 China Division of Infectious Disease Brigham and Women 's Hospital and Department of Microbiology and Immunobiology Harvard Medical School Boston MA 02115 USA Beijing Genomics Institute Co. Ltd. Shenzhen 518083 China Department of Medical Oncology Affiliated Tumor Hospital of Guangzhou Medical University Guangzhou 510095 China Department of Oncology and Hematology The First Affiliated Hospital of Guangzhou Medical University Guangzhou 510120 China

The latent expression pattern of Epstein-Barr Virus （EBV）igenes in nasopharyngeal carcinoma （NPC） has been extensively investigated, and the expression of several lytic genes in NPC has been reported. However, comprehensive information through EBV transcriptome analysis in NPC is limited. We performed paired-end RNA-seq to systematically and comprehensively characterize the expression of EBV genes in NPC tissue and C666-1 NPC cell line, which consistently carries EBV. In addition to the transcripts restricted to type II latency infection, the type Ⅲ latency EBNA3s genes and a substantial number of lytic genes, such as BZLF1, BRLF1, and BMRF1, were detected through RNA-seq and were further verified in C666-1 cells and NPC tissue through real- time PCR. We also performed clustering analysis to classify NPC patient groups in terms of EBV gene expression, which presented two subtypes of NPC samples. Results revealed interesting patterns of EBV gene expression in NPC patients. This clustering was correlated with many signaling pathways, such as those related to heterotrimeric G-protein signaling, inflammation mediated by chemokine and cytokine signaling, ribosomes, protein metabolism, influenza infection, and ECM-receptor interaction. Our combined findings suggested that the expression of EBV genes in NPC is restricted not only to type II latency genes but also to type Ⅲ latency and lyric genes. This study provided further insights into the potential role of EBV in the development of NPC.

关键词： Epstein-Barr virus paired-end transcriptome sequencing latency genes lytic genes nasopharyngeal carcinoma

Local coordination and electronic interactions of Pd/MXene via dual‐atom codoping with superior durability for efficient electrocatalytic ethanol oxidation

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Carbon Energy 2024年第8期6卷 166-177页

作者： Zhangxin Chen Fan Jing Minghui Luo Xiaohui Wu Haichang Fu Shengwei Xiao Binbin Yu dan Chen Xianqiang xiong Yanxian Jin School of Pharmaceutical and Chemical Engineering Taizhou UniversityTaizhouZhejiangChina School of Sciences Zhejiang Sci‐Tech UniversityHangzhouZhejiangChina

Catalyst design relies heavily on electronic metal‐support interactions,but the metal‐support interface with an uncontrollable electronic or coordination environment makes it ***,we outline a promising approach for the rational design of catalysts involving heteroatoms as anchors for Pd nanoparticles for ethanol oxidation reaction(EOR)*** doped B and N atoms from dimethylamine borane(DB)occupy the position of the Ti_(3)C_(2)lattice to anchor the supported Pd *** electrons transfer from the support to B atoms,and then to the metal Pd to form a stable electronic center.A strong electronic interaction can be produced and the d‐band center can be shifted down,driving Pd into the dominant metallic state and making Pd nanoparticles deposit uniformly on the ***‐obtained Pd/DB–Ti_(3)C_(2)exhibits superior durability to its counterpart(∼14.6%retention)with 91.1%retention after 2000 cycles,placing it among the top single metal anodic ***,in situ Raman and density functional theory computations confirm that Pd/DB–Ti_(3)C_(2)is capable of dehydrogenating ethanol at low reaction energies.

关键词： durability electronic interactions ethanol oxidation heteroatom codoping Pd/MXene

The multiple mechanisms of tripterygium wilfordii-induced acute kidney injury based on network pharmacology and molecular docking

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Journal of Chinese Pharmaceutical Sciences 2021年第7期30卷 556-569页

作者： Cheng Li Yuhua Zhu Xiaomin Sun Jing Xu dan xiong Juan Wang Xinlu Gao Xulong Chen Affiliated Hospital Jiujiang UniversityJiujiang 332000China Key Laboratory of Modern traditional Chinese Medicine preparations Ministry of EducationJiangxi University of Traditional Chinese MedicineNanchang 330004China

Acute kidney injury(AKI)is a common and serious health issue with a growing incidence and mortality *** wilfordii(TW)is a traditional Chinese medicine that has been reported to cause kidney ***,the associated mechanism of TW-induced AKI remains ***,we aimed to uncover the associated mechanisms of AKI induced by TW using network pharmacology and *** candidate compounds of TW and the potential targets were screened using TCMSP and CTD database,and the AKI-related targets were identified from the Dis Ge NET *** disease targets were intersected with the drug targets,and the Wayne diagram was drawn by Venny 2.1.0 *** developed proteinprotein interactions(PPI)network and the“disease-compound-target-pathway”network through the Cytoscape *** using the DAVID database,GO and KEGG enrichment analysis was carried out to reveal the potential signaling pathways of the compound-TW-induced ***,the Auto dock vina 1.1.2 was used for molecular docking to verify the active compound and key targets’binding *** compounds and key targets of TW-induced AKI were identified,including triptolide,kaempferol,β-sitosterol,nobiletin,stigmasterol,TNF,and so *** GO analysis showed that potential genes’biological function was mainly involved in apoptosis,oxidative stress,and ***,eight signaling pathways were found,including the HIF-1 signaling pathway,VEGF signaling pathway,apoptosis,and so *** molecular docking results proved that the core compound’s affinity with the corresponding protein of the gene targets was *** study preliminarily predicted the core toxic compounds,targets,and related pathways of TW-induced AKI,providing a theoretical basis for the follow-up clinical rational drug use and related research work of TW.

关键词： Tripterygium wilfordii Acute renal injury Biological mechanism Network pharmacology Molecular docking

Identification of atypical T4SS effector proteins mediating bacterial defense

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mLife 2023年第3期2卷 295-307页

作者： Xi Shen Zixiang Yang Zihan Li dan xiong Jinxing Liao Weimei He danyu Shen Xiaolong Shao Ben Niu Yongxing He Yong-Gui Gao Guoliang Qian State Key Laboratory of Biological Interactions and Crop Health Key Laboratory of Integrated Management of Crop Diseases and PestsCollege of Plant ProtectionNanjing Agricultural UniversityNanjingChina College of Life Science Northeast Forestry UniversityHarbinChina Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations Lanzhou UniversityLanzhouChina School of Biological Sciences Nanyang Technological UniversitySingaporeSingapore

To remain competitive,proteobacteria use various contact-dependent weapon systems to defend against microbial *** bacterial-killing type IV secretion system(T4SS)is one such powerful *** commonly controls the killing/competition between species by secreting the lethal T4SS effector(T4E)proteins carrying conserved XVIPCD domains into competing *** this study,we sought knowledge to understand whether the bacterial-killing T4SS-producing bacteria encode T4E-like proteins and further explore their biological *** achieve this,we designed a T4E-guided approach to discover T4E-like proteins that are designated as atypical ***,this approach required scientists to perform simple BlastP search to identify T4E homologs that lack the XVIPCD domain in the genomes of T4SS-producing *** homologous genes were then screened in Escherichia coli to identify antibacterial candidates(atypical T4Es)and their neighboring detoxification proteins,followed by testing their gene cotranscription and validating their physical *** this approach,we did discover two atypical T4E proteins from the plant-beneficial Lysobacter enzymogenes and the phytopathogen Xanthomonas *** also provided substantial evidence to show that the atypical T4E protein Le1637-mediated bacterial defense in interspecies interactions between *** and its ***,the newly designed T4E-guided approach holds promise for detecting functional atypical T4E proteins in bacterial cells.

关键词： atypical effectors defense immunity protein T4SS toxic