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Journal of Systems Engineering and Electronics 2020年第6期31卷 1116-1127页

作者： MA huihui TAO Haihong National Laboratory of Radar Signal Processing Xidian UniversityXi'an 710071China

In this paper,a sparse nonuniform rectangular array based on spatially spread electromagnetic vector sensor(SNRASSEMVS)is introduced,and a method for estimating 2D-direction of arrival(DOA)and polarization is ***,according to the special structure of the sparse nonuniform rectangular array(SNRA),a set of accurate but ambiguous direction-cosine estimates can be *** the steering vector of spatially spread electromagnetic vector sensor(SSEMVS)can be extracted from the array manifold to obtain the coarse but unambiguous direction-cosine ***,the disambiguation approach can be used to get the final accurate estimates of 2DDOA and *** with some existing methods,the SNRA configuration extends the spatial aperture and refines the parameters estimation accuracy without adding any redundant antennas,as well as reduces the mutual coupling ***,the proposed algorithm resolves multiple sources without the priori knowledge of signal information,suffers no ambiguity in the estimation of the Poynting vector,and pairs the x-axis direction cosine with the y-axis direction cosine *** results are given to verify the effectiveness and superiority of the proposed algorithm.

关键词： sparse nonuniform rectangular array(SNRA) spatially spread electromagnetic vector sensor(SSEMVS) directioncosine polarization mutual coupling

Study on Coded Permutation Entropy of Finite Length Gaussian White Noise Time Series

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Chinese Journal of Electronics 2024年第1期33卷 185-194页

作者： huihui SUN Xiaofeng ZHANG School of Physics and Information Technology Shaanxi Normal University

As an extension of permutation entropy(PE), coded permutation entropy(CPE) improves the performance of PE by making a secondary division for ordinal patterns defined in PE. In this study, we provide an exploration of the statistical properties of CPE using a finite length Gaussian white noise time series theoretically. By means of the Taylor series expansion, the approximate expressions of the expected value and variance of CPE are deduced and the Cramér-Rao low bound(CRLB) is obtained to evaluate the performance of the CPE estimator. The results indicate that CPE is a biased estimator, but the bias only depends on relevant parameters of CPE and it can be easily corrected for an arbitrary time series. The variance of CPE is related to the encoding patterns distribution,and the value converges to the CRLB of the CPE estimator when the time series length is large enough. For a finitelength Gaussian white noise time series model, the predicted values can match well with the actual values, which further validates the statistic theory of CPE. Using the theoretical expressions of CPE, it is possible to better understand the behavior of CPE for most of the time series.

关键词： Time series analysis White noise Predictive models Taylor series Entropy Encoding Time measurement

Genome-wide profiling of circular RNAs,alternative splicing,and R-loops in stem-differentiating xylem of Populus trichocarpa

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Journal of Integrative Plant Biology 2021年第7期63卷 1294-1308页

作者： Xuqing Liu Yubang Gao Jiakai Liao miao miao Kai Chen Feihu Xi Wentao Wei huihui Wang Yongsheng Wang XiXu Anireddy S.N.Reddy Lianfeng Gu Basic Forestry and Proteomics Research Center College of ForestryFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyFujian Agriculture and Forestry UniversityFuzhou 350002China Basic Forestry and Proteomics Research Center College of Life ScienceFujian Agriculture and Forestry UniversityFuzhou 350002China Department of Biology and Program in Cell and Molecular Biology Colorado State UniversityFort CollinsColorado 80523USA

Circular RNAs(circRNAs)are a recently dis-covered type of non‐coding RNA derived from pre‐mRNAs.R‐loops consist of a DNA:RNA hybrid andthe associated single‐stranded ***-dopsis thaliana,circRNA:DNA R‐loops regulatealternative splicing(AS)ofSEPALLATA3(SEP3).However,the occurrence and functions ofcircRNAs and R‐loops inPopulus trichocarpaarelargely ***,we performed circRNA‐enriched sequencing in the stem‐differentiatingxylem(SDX)*** identified 2,742distinct circRNAs,including circ‐CESA4,circ‐IRX7,and circ‐GUX1,which are generated from genesinvolved in cellulose,and hemicellulose biosyn-thesis,*** investigate the roles ofcircRNAs in modulating alternative splicing(AS),we detected 7,836 AS events using PacBio Iso‐Seq and identified 634 circRNAs that overlappedwith 699 AS ***,using DNA:RNAhybrid immunoprecipitation followed by se-quencing(DRIP‐seq),we identified 8,932 R‐looppeaks that overlapped with 181 circRNAs and 672AS ***,several SDX‐related circRNAsoverlapped with R‐loop peaks,pointing to theirpossible roles in modulating AS in ***,overexpressing circ‐IRX7increased the levels ofR‐loop structures and decreased the frequency ofintron retention in *** provides a valuable R‐loop atlas resourceand uncovers the interplay between circRNAs andAS in SDX ***.

关键词： alternative splicing circular RNA R‐loop Populustrichocarpa stem‐differentiating xylem

A New Class of Partial Orders

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Algebra Colloquium 2023年第4期30卷 585-598页

作者： huihui Zhu Liyun Wu School of Mathematics Hefei University of TechnologyHefei 230009China

Let R be a unital*-*** any a,w,b∈R,we apply the w-core inverse to define a new class of partial orders in R,called the w-core partial *** that a,b∈R are w-core *** say that a is below b under the w-core partial order if a_(w)^(#)a=a_(w)^(#)b and a_(w)a_(w)^(#)=bwa_(w)^(#),where a_(w)^(#)denotes the w-core inverse of *** of the w-core partial order are given,and its relationships with several types of partial orders are also *** particular,we show that the core partial order coincides with the a-core partial order,and the star partial order coincides with the a*-core partial order.

关键词： w-core inverse inverse along an element sharp partial order star partial order core partial order rings with involution

Multidimensional stability of traveling fronts in monostable reaction-difusion equations with complex perturbations

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Science China Mathematics 2014年第2期57卷 353-366页

作者： ZENG huihui Mathematical Sciences Center Tsinghua University

This paper studies the multidimensional stability of traveling fronts in monostable reaction-difusion equations,including Ginzburg-Landau equations and Fisher-KPP *** and Wayne(1994)showed a one-dimensional stability result of traveling fronts with speeds c c(the critical speed)under complex *** the present work,we prove that these traveling fronts are also asymptotically stable subject to complex perturbations in multiple space dimensions(n=2,3),employing weighted energy methods.

关键词： traveling fronts reaction-diffusion equations multi-dimensional stability

Assessing urban low-carbon performance from a metabolic perspective

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Science China Earth Sciences 2021年第10期64卷 1721-1734页

作者： Shaoqing CHEN huihui LONG Bin CHEN School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275China School of Environment Beijing Normal UniversityBeijing 100875China

How to mitigate anthropogenic carbon emissions in cities determines to a large degree whether global temperature targets in this century are to be *** 12 cities in or outside China as case studies,we quantified the critical processes of carbon metabolism based on the urban carbon metabolism assessment framework(CMAF)*** differences of sector contribution,and per capita and intensity among carbon throughflows,carbon inflows and carbon emissions were ***,we established an indicator system for CMAF consisting of flow-based and structural indicators to compare the low-carbon performances of *** results showed that the total carbon throughflow(TCT)and total carbon inflow(TCI)in Chinese cities were 7–12%higher than in European and American cities regarding the manufacturing and services sector on average,but 6–9%lower in the household consumption ***,Tianjin,Nanjing and Guangzhou had lower per capita TCT and TCI than in European and American cities such as Paris and Los Angeles,while their carbon intensities were about three times as *** per capita TCT in a city was found significantly correlated with per capita energy consumption and had a certain correlation with per capita building or housing *** study found that TCT,TCI and carbon dioxide emission each provided unique information to measure the potential climatic impact of *** difference in the ranking of low-carbon performance between the investigated cities was significant both in terms of flow-based and structural *** suggest these assessment indicators of carbon metabolism be integrated into urban resources management to reflect both the decarbonization status and future emission reduction potential more accurately and to provide systemic decision support for achieving the goal of carbon neutrality in cities.

关键词： Urban metabolic system Physical carbon flow Low-carbon assessment Urban resources management Climate change mitigation

Solution for a nonlocal elastic bar in tension

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Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 1059-1065页

作者： ZHU XiaoWu DAI huihui School of Mathematics and Statistics Wuhan University Wuhan 430072 China Department of Mathematics City University of Hong Kong Kowloon Hong Kong China

In this paper we use an alternative method to study analytically and numerically for a nonlocal elastic bar in *** equilibrium equation of the model is a Fredholm integral equation of the second *** the aid of an efficient iterative method,we are able to get the approximate analytical *** the purpose of comparisons,numerical solutions are also obtained for two types of nonlocal kernels,which show the validity of the analytical *** effects of some related parameters are also investigated.

关键词： nonlocal elasticity integral equation iterative method asymptotics

L^2-Decay rate for non-ergodic Jackson network

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Frontiers of Mathematics in China 2014年第5期9卷 1033-1049页

作者： huihui CHENG Yonghua MAO School of Mathematics and Information Sciences North China University of Water Resources and Electric Power Zhengzhou 450045 China School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education Beijing 100875 China

We establish the additive theorem of L^2-decay rate for multi- dimensional Markov process with independent marginal processes. Using this and the decomposition method, we obtain explicit upper and lower bounds for dec... 详细信息

关键词： L^2-Decay rate additive theorem decomposition method Jacksonnetwork

The essential adaptors of innate immune signaling

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Protein & Cell 2013年第1期4卷 27-39页

作者： huihui Chen Zhengfan Jiang School of Life Sciences Peking UniversityBeijing 100871China

Microbial components and the endogenous molecules released from damaged cells can stimulate germ-line-encoded pattern recognition receptors(PRRs)to transduce signals to the hub of the innate immune signaling network-the adaptor proteins MyD88/TRIF/MAVS/STING/Caspase-1,where integrated signals relay to the relevant transcription factors IRF3/IRF7/NF-κB/AP-1 and the signal transducer and activator of tran-scription 6(STAT6)to trigger the expression of typeІinterferons and inflammatory cytokines or the assem-bly of *** pleiotropic cytokines are secreted and bind to specific receptors,activating the signaling pathways including JAK-STAT for the prolif-eration,differentiation and functional capacity of im-mune *** review focuses on several critical adaptors in innate immune signaling cascades and recent progress in their molecular mechanisms.

关键词： innate immunity adaptor STING STAT6

Civil aircraft fault tolerant attitude tracking based on extended state observers and nonlinear dynamic inversion

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Journal of Systems Engineering and Electronics 2022年第1期33卷 180-187页

作者： MA Xinjian LIU Shiqian CHENG huihui School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

For the problem of sensor faults and actuator faults in aircraft attitude control,this paper proposes a fault tolerant control(FTC)scheme based on extended state observer(ESO)and nonlinear dynamic inversion(NDI).First,two ESOs are designed to estimate sensor faults and actuator faults ***,the angular rate signal is reconstructed according to the estimation of sensor ***,in angular rate loop,NDI is designed based on reconstruction of angular rate signals and estimation of actuator *** FTC scheme proposed in this paper is testified through numerical *** results show that it is feasible and has good fault tolerant ability.

关键词： fault tolerant control(FTC) signal reconstruction extended state observer(ESO) nonlinear dynamic inversion(NDI)