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STABC-IR:An air target intention recognition method based on bidirectional gated recurrent unit and conditional random field with space-time attention mechanism

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Chinese Journal of Aeronautics 2023年第3期36卷 316-334页

作者： Siyuan Wang Gang wang Qiang FU Yafei SONG Jiayi LIU Sheng HE Air Defense and Antimissile School Air Force Engineering UniversityXi’an 710051China

The battlefield environment is changing rapidly,and fast and accurate identification of the tactical intention of enemy targets is an important condition for gaining a decision-making advantage.The current Intention Recognition(IR)method for air targets has shortcomings in temporality,interpretability and back-and-forth dependency of intentions.To address these problems,this paper designs a novel air target intention recognition method named STABC-IR,which is based on Bidirectional Gated Recurrent Unit(Bi GRU)and Conditional Random Field(CRF)with Space-Time Attention mechanism(STA).First,the problem of intention recognition of air targets is described and analyzed in detail.Then,a temporal network based on Bi GRU is constructed to achieve the temporal requirement.Subsequently,STA is proposed to focus on the key parts of the features and timing information to meet certain interpretability requirements while strengthening the timing requirements.Finally,an intention transformation network based on CRF is proposed to solve the back-and-forth dependency and transformation problem by jointly modeling the tactical intention of the target at each moment.The experimental results show that the recognition accuracy of the jointly trained STABC-IR model can reach 95.7%,which is higher than other latest intention recognition methods.STABC-IR solves the problem of intention transformation for the first time and considers both temporality and interpretability,which is important for improving the tactical intention recognition capability and has reference value for the construction of command and control auxiliary decision-making system.

关键词： Bidirectional gated recurrent network Conditional random field Intention recognition Intention transformation Situation cognition Space-time attention mechanism

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Effects of 3-D deformation of elastic wings on aerodynamic performance of an aircraft model

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Science China(Technological Sciences) 2023年第5期66卷 1365-1377页

作者： GUO QinFeng FENG siyuan wang JinJun Fluid Mechanics Key Laboratory of Education Ministry Beijing University of Aeronautics and AstronauticsBeijing 100191China

The wind tunnel experiment is conducted on a simplified aircraft model with rigid and two kinds of elastic wings to investigate the effect of wing 3-D deformation on the aircraft aerodynamic performance.The results show that two elastic wings exhibit different aerodynamic performances,which are classified as the lift-enhancement wing and the drag-reduction wing.For the liftenhancement wing,the stall angle is delayed from 8°to 15°with a corresponding lift increment of 64.3%compared with the rigid wing.It is shown that the lift enhancement of the aircraft model is accompanied by the torsional vibration mode of the wing,which results in the significant improvement of wing circulation.For the drag-reduction wing,the aerodynamic performance is dominated by the time-averaged deformation,which couples the bending and twisting.The wing twist reduces the effective angle of attack,as well as the frontal area,and contributes to the decreased wake deficit.Meantime,the bent wings function as barriers to the cross flow resulting in a reduction of lift-induced drag.As a result,the drag coefficient is reduced from 0.115 to 0.098 with a reduction of 14.8%at angle of attack of 12°.

关键词： wind tunnel experiment elastic wing aerodynamic force wing deformation wake flow field

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Proteomics research of SARS-CoV-2 and COVID-19 disease

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Medical Review 2022年第4期2卷 427-445页

作者： Nan Zhang Siyuan Wang Catherine C.L.Wong Department of Medical Research Center State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingP.R.China Department of Radiation Oncology College of MedicineThe Ohio State UniversityColumbusOHUSA Center for Cancer Metabolism Comprehensive Cancer CenterThe Ohio State UniversityColumbusOHUSA Department of Medical Research Center State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College Hospital(Dongdan Campus)Chinese Academy of Medical Sciences&Peking Union Medical CollegeNo.1 Shuaifuyuan WangfujingDongcheng DistrictBeijing 100730P.R.China Tsinghua University-Peking University Joint Center for Life Sciences Tsinghua UniversityBeijing 100084P.R.China

Currently,coronavirus disease 2019(COVID-19)is still spreading in a global scale,exerting a massive health and socioeconomic crisis.Deep insights into the molecular functions of the viral proteins and the pathogenesis of this infectious disease are urgently needed.In this review,we comprehensively describe the proteome of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and summarize their protein interaction map with host cells.In the protein interaction network between the virus and the host,a total of 787 host prey proteins that appeared in at least two studies or were verified by co-immunoprecipitation experiments.Together with 29 viral proteins,a network of 1762 proximal interactions were observed.We also review the proteomics results of COVID-19 patients and proved that SARS-CoV-2 hijacked the host’s translation system,post-translation modification system,and energy supply system via viral proteins,resulting in various immune disorders,multiple cardiomyopathies,and cholesterol metabolism diseases.

关键词： COVID-19 disease proteomics research SARS-CoV-2 particles

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Improving seeking precision by utilizing ghost imaging in a semi-active quadrant detection seeker

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Chinese Journal of Aeronautics 2021年第12期34卷 171-176页

作者： Siyuan Wang Lijing LI Wen CHEN Mingjie SUN Department of Opto-electronic Engineering Beihang UniversityBeijing 100083China

Conventional semi-active laser guidance takes advantage of the laser designator to illuminate the stable and uniform laser spot on target precisely.The seeker collects the reflected light by a quadrant detector and outputs the relative position information to guide the missile to the illuminating laser spot.However,the designation and guidance accuracy could be jeopardized by the randomly drifting of laser spot caused by the instability of designation platform and air turbulence.In this work,ghost imaging technique is adapted to a quadrant detector semi-active seeker by utilizing structured illumination on the target.With a series of structured illumination masks,the signals from the quadrant detector are multiplexed to perform calculation of the target relative position as well as image reconstruction of the illuminated area simultaneously.Automatic target recognition methods could be further applied to the reconstructed image to calculate the designating error and correct the guidance.The results of simulation and experiment demonstrate that the proposed method could improve the guidance accuracy in many circumstances which would lead to attacking deviation if conventional semi-active laser guidance is used.

关键词： Digital micro-mirror device Ghost imaging Guidance system Image acquisition Semi-active laser seeker

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Iron-Catalyzed Aminomethyloxygenative Cyclization of Hydroxy-α-diazoesters with N,O-Aminals

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Chinese Journal of Chemistry 2020年第4期38卷 389-393页

作者： Suchen Zou Tianze Zhang Siyuan Wang Hanmin Huang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry Center for Excellence in Molecular SynthesisUniversity of Science and Technology of ChinaChinese Academy of SciencesHefeiAnhui 230026China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhouGonsu 730000China

Summary of main observation and conclusion A new and eficient cyclization reaction has bleen developed to synthesize cyclic a,a-disubstituted B-amino esters via iron-catalyzed intramolecular aminomethyloxygenative cyclization of diazo compounds with N,O-aminal under mild reaction condi-tions.A broad range of hydroxy-a diazoesters with different substituents and various N,O-aminals were compatible with this protocol,affording the corresponding a,a-disubstitutedβ-amino esters bearing a five-to eight-membered oxacycle in good yields.

关键词： esters substituted cyclization

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Predicting the Power Spectrum of Amplified OFDM Signals Using Higher-Order Intercept Points

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Chinese Journal of Electronics 2022年第2期31卷 213-219页

作者： YAN siyuan YANG Xianzhen wang Xiaoru LI Fu Department of Electrical and Computer Engineering Portland State University School of Computer Science and Technology Beijing University of Posts and Telecommunications

Orthogonal frequency-division multiplexing(OFDM) has been developed into a popular modulation scheme for wireless communication systems, used in applications such as LTE and 5 G. In wireless communication systems, nonlinearity caused by radio frequency(RF)amplifiers will generate distortions to both passband and adjacent channels such that the transmission quality is degraded. The study of this article aims to predict the power spectrum for OFDM based signals at the output of an RF amplifier due to the nonlinearity. In this article,based on Taylor polynomial coefficients, a power spectrum expression for amplified OFDM signals in terms of intercept points(up to nth-order) is derived. This model is useful to RF engineers in choosing and testing RF amplifiers with appropriate specifications, such as intercept points and gain, to meet the requirements of wireless standards. Measurements are carried out to confirm the results of the proposed model.

关键词： RF amplifiers Power spectrum density OFDM Intercept points 1 dB compression point

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Non-bonding modulations between single atomic cerium and monodispersed selenium sites towards efficient oxygen reduction

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Nano Research 2024年第6期17卷 4753-4763页

作者： Leilei Yin Shuai Zhang Mingzi Sun Siyuan Wang Bolong Huang Yaping Du Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina

Currently,dual atomic catalysts(DACs)with neighboring active sites for oxygen reduction reaction(ORR)still meet lots of challenges in the synthesis,especially the construction of atomic pairs of elements from different blocks of the periodic table.Herein,a“rare earth(Ce)-metalloid(Se)”non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect engineering.Encouraging,the optimized Ce-Se diatomic catalysts(Ce-Se DAs/NC)displayed a half-wave potential of 0.886 V vs.reversible hydrogen electrode(RHE)and excellent stability,which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever reported.In addition,a primary zinc-air battery constructed using Ce-Se DAs/NC delivers a higher peak power density(209.2 mW·cm^(−2))and specific capacity(786.4 mAh·gZn^(−1))than state-of-the-art noble metal catalysts Pt/C.Theoretical calculations reveal that the Ce-Se DAs/NC has improved the electroactivity of the Ce-N_(4)region due to the electron transfer towards the nearby Se specific activity(SA)sites.Meanwhile,the more electron-rich Se sites promote the adsorptions of key intermediates,which results in the optimal performances of ORR on Ce-Se DAs/NC.This work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.

关键词： catalyst rare earth oxygen reduction reaction(ORR) metalloid non-bonding modulation

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The role of dendritic cells in the immunomodulation to implanted biomaterials

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International Journal of Oral Science 2022年第4期14卷 424-438页

作者： Siyuan Wang Yanqi Chen Zhaoting Ling Jia Li Jun Hu Fuming He Qianming Chen Stomatology Hospital School of StomatologyZhejiang University School of MedicineClinical Research Center for Oral Disease of Zhejiang ProvinceKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Centerof Zhejiang UniversityHangzhouChina

Considering the substantial role played by dendritic cells(DCs) in the immune system to bridge innate and adaptive immunity,studies on DC-mediated immunity toward biomaterials principally center on their adjuvant effects in facilitating the adaptive immunity of codelivered antigens. However, the effect of the intrinsic properties of biomaterials on dendritic cells has not been clarified. Recently, researchers have begun to investigate and found that biomaterials that are nonadjuvant could also regulate the immune function of DCs and thus affect subsequent tissue regeneration. In the case of proteins adsorbed onto biomaterial surfaces,their intrinsic properties can direct their orientation and conformation, forming “biomaterial-associated molecular patterns(BAMPs)”. Thus, in this review, we focused on the intrinsic physiochemical properties of biomaterials in the absence of antigens that affect DC immune function and summarized the underlying signaling pathways. Moreover, we preliminarily clarified the specific composition of BAMPs and the interplay between some key molecules and DCs, such as heat shock proteins(HSPs) and high mobility group box 1(HMGB1). This review provides a new direction for future biomaterial design, through which modulation of host immune responses is applicable to tissue engineering and immunotherapy.

关键词： immunity biomaterials clarified

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A portable viable Salmonella detection device based on microfluidic chip and recombinase aided amplification

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Chinese Chemical Letters 2023年第2期34卷 268-273页

作者： Wuzhen Qi Siyuan Wang Lei wang Xinge Xi Shangyi Wu Yanbin Li Ming Liao Jianhan Lin Key Laboratory of Agricultural Information Acquisition Technology Ministry of Agriculture and Rural AffairsChina Agricultural UniversityBeijing 100083China Department of Biological and Agricultural Engineering University of ArkansasFayetteville 72701United States College of Veterinary medicine South China Agricultural UniversityGuangzhou 510642China

creening of foodborne pathogens is important to prevent contaminated foods from their supply chains.n this study, a portable detection device was developed for rapid, sensitive and simple detection of viable almonella using a finger-actuated microfluidic chip and an improved recombinase aided amplification (RAA) assay. Improved propidium monoazide(PMAxx) was combined with RAA to enable this device to distinguish viable bacteria from dead ones. The modification of PMAxx into dead bacteria, the magnetic xtraction of nucleic acids from viable bacteria and the RAA detection of extracted nucleic acids were performed using the microfluidic chip on its supporting device by finger press-release operations. The fluorescent signal resulting from RAA amplification of the nucleic acids was collected using a USB camera nd analyzed using a self-developed smartphone App to quantitatively determine the bacterial concenration. This device could detect Salmonella typhimurium in spiked chicken meats from 1.3 × 10^(2) CFU/m L o 1.3 × 10^(7) CFU/m L in 2 h with a lower detection limit of 130 CFU/m L, and has shown its potential for on-site detection of foodborne pathogens.

关键词： Finger-actuated microfluidic chip PMAxx Recombinase aid amplification Smartphone App Viable bacterial detection

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Application-Oriented Homogeneous Control Protocol Design for Multi-Agent Systems Under Input Constraints

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Guidance, Navigation and Control 2023年第3期3卷 89-109页

作者： Siyuan Wang Sandeep Kumar Soni Gang Zheng Driss Boutat Department of Energy Risks and Environment INSA Centre Val de LoireBourges18000France Department of Electrical Engineering Shiv Nadar Institution of Eminence Delhi NCR201314India Defrost Centre Inria de l'Universite de Lille Villeneuve-d'Ascq59650France

An application-oriented homogeneous control protocol is proposed to solve the consensus problem of multi-agent system(MAS)modeled by higher-order integrator.This nonlinear control protocol is able to homogenize the linear system with a special degree called homogeneity degree.This homogeneous control protocol ensures asymptotically/finite-time stable multi-agent systems(MASs)(or fixed-time attractive to compact sets containing the origin)by selecting di®erent homogeneity degrees.If the linear control protocol for each agent is provided,the proposed nonlinear homogeneous control protocol in this paper can be easily implemented without requiring any tuning of the control parameters.A bounded homogeneous control protocol,which is a special form of the controller proposed,is also introduced to address the same problem with input constraints.Finally,numerical simulations are conducted to demonstrate the e®ectiveness of the proposed approach.

关键词： Homogeneous system multi-agent input constraint

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