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Research on virtual entity decision model for LVC tactical confrontation of army units

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Journal of Systems Engineering and Electronics 2022年第5期33卷 1249-1267页

作者： gao ang GUO Qisheng DONG Zhiming Tang Zaijiang ZHang Ziwei FENG Qiqi Military Exercise and Training Center Army Academy of Armored ForcesBeijing 100072China

According to the requirements of the live-virtual-constructive(LVC)tactical confrontation(TC)on the virtual entity(VE)decision model of graded combat capability,diversified actions,real-time decision-making,and generalization for the enemy,the confrontation process is modeled as a zero-sum stochastic game(ZSG).By introducing the theory of dynamic relative power potential field,the problem of reward sparsity in the model can be *** reward shaping,the problem of credit assignment between agents can be *** on the idea of meta-learning,an extensible multi-agent deep reinforcement learning(EMADRL)framework and solving method is proposed to improve the effectiveness and efficiency of model *** show that the model meets the requirements well and the algorithm learning efficiency is high.

关键词： live-virtual-constructive(LVC) army unit tactical confrontation(TC) intelligent decision model multi-agent deep reinforcement learning

Operational effectiveness evaluation based on the reduced conjunctive belief rule base

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Journal of Systems Engineering and Electronics 2022年第5期33卷 1161-1172页

作者： ZHang Ziwei GUO Qisheng DONG Zhiming LIU Hongxiang gao ang QI Pengcheng Military Exercise and Training Center Army Academy of Armored ForcesBeijing 100072China Unit 32128 of the PLA Ji’nan 250024China Department of Equipment Support and Remanufacture Army Academy of Armored ForcesBeijing 100072China

To address the issue of rule premise combination explosion in the construction of the traditional complete conjunctive belief rule base(BRB),this paper introduces an orthogonal design method to reduce the conjunctive *** reasoning method based on reduced conjunctive BRB is designed with the help of the conversion technology from conjunctive BRB to disjunctive ***,the operational mission effectiveness evaluation is taken as an example to verify the proposed *** results show that the method proposed in this paper is feasible and effective.

关键词： operational effectiveness evaluation reduced conjunctive belief rule base(BRB) orthogonal design evidence reasoning(ER)

Fourty-nine years old woman co-infected with SARS-CoV-2 and Mycoplasma:A case report

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World Journal of Clinical Cases 2020年第23期8卷 6080-6085页

作者： Zi-ang gao Ling-Bao gao Xin-Jie Chen Yu Xu Department of Otolaryngology-Head and Neck Surgery Renmin Hospital of Wuhan UniversityWuhan 430060Hubei ProvinceChina Department of Transfusion Taizhou People's HospitalTaizhou 225300Jiangsu ProvinceChina Department of Neurology The Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina

BACKGROUND Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is a new virus responsible for the outbreak of respiratory illness known as coronavirus disease 2019(CoVID-19).Mycoplasma is an uncommon co-infected pathogen with SARSCoV-2 and has not yet been *** tomography(CT),used as an accessory examination,may play a more significant role in this *** SUMMARY A 49-year-old female presented with a cough,expectoration and chest congestion followed by elevated C-reactive protein and erythrocyte sedimentation *** images showed ground-glass opacities in bilateral lower lobes and a patchy and striate shadow in the right upper *** M antibody of Mycoplasma pneumoniae was positive and real-time fluorescence polymerase chain reaction of sputum was positive for SARS-CoV-2 nucleic *** diagnosis of CoVID-19 was made based on laboratory results,chest CT images,clinical manifestations and epidemiologic *** was treated with combination therapy for 17 d and showed a marked *** Co-infection with SARS-CoV-2 and Mycoplasma in CoVID-19 patients appears to be *** is an acceptable method for the primary diagnosis and treatment should be initiated as soon as *** therapy with antiviral,anti-inflammatory,traditional Chinese herbal medicine and interferon inhalation may be a reference for further progress in treating this co-infection.

关键词： CoVID-19 SARS-CoV-2 Mycoplasma Co-infection Computed tomography Infectious disease Case report

Periodically poled lithium niobate whispering gallery mode microcavities on a chip

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Science China(Physics,Mechanics & Astronomy) 2018年第11期61卷 36-40页

作者： ZhenZhong Hao Li Zhang ang gao WenBo Mao XiaoDan Lyu XiaoMei gao Fang Bo Feng gao GuoQuan Zhang JingJun Xu MOE Key Laboratory of Weak Light Nonlinear Photonics TEDA Institute of Applied Physics and School of Physics Nankai University Tianjin 300457 China The Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China

In this study, we investigate the fabrication of periodically poled lithium niobate(PPLN) microdisk cavities on a chip. These resonators are fabricated from a PPLN film with a 16 μm poling period on insulator using conventional microfabrication *** quality factor of the PPLN microdisk resonators with a 40-μm radius and a 700-nm thickness is 6.7×10~5. Second harmonic generation(SHG) with an efficiency of 2.2×10^(-6) mW(-1) is demonstrated in the fabricated PPLN microdisks. The nonlinear conversion efficiency could be considerably enhanced by optimizing the period and pattern of the poled structure and by improving the cavity quality factors.

关键词： whispering gallery mode periodically poled lithium niobate microcavities second harmonic generation

Joint Active and Passive Beamforming Design in Intelligent Reflecting Surface(IRS)-Assisted Covert Communications:A Multi-Agent DRL Approach

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China Communications 2024年第9期21卷 11-26页

作者： gao ang Ren Xiaoyu Deng Bin Sun Xinshun Zhang Jiankang School of Electronic Information Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Near Ground Detection and Perception Technology Wuxi 214035China Department of Computing and Informatics Bournemouth UniversityUK

Intelligent Reflecting Surface(IRS),with the potential capability to reconstruct the electromagnetic propagation environment,evolves a new IRSassisted covert communications paradigm to eliminate the negligible detection of malicious eavesdroppers by coherently beaming the scattered signals and suppressing the signals ***,when multiple IRSs are involved,accurate channel estimation is still a challenge due to the extra hardware complexity and communication *** the crossinterference caused by massive reflecting paths,it is hard to obtain the close-formed solution for the optimization of covert *** this basis,the paper improves a heterogeneous multi-agent deep deterministic policy gradient(MADDPG)approach for the joint active and passive beamforming(Joint A&P BF)optimization without the channel estimation,where the base station(BS)and multiple IRSs are taken as different types of agents and learn to enhance the covert spectrum efficiency(CSE)*** to the‘centralized training and distributed execution’feature of MADDPG,each agent can execute the active or passive beamforming independently based on its partial observation without referring to *** results demonstrate that the proposed deep reinforcement learning(DRL)approach could not only obtain a preferable CSE of legitimate users and a low detection of probability(LPD)of warden,but also alleviate the communication overhead and simplify the IRSs deployment.

关键词： covert communications deep reinforcement learning intelligent reflecting surface

Structural insight into acute intermittent porphyria

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生物物理学报 2009年第S1期25卷 356-357页

作者： ang gao Andrzej Joachimiak Neil Shaw National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Structural Biology Center Advanced Photon Source Argonne National Laboratory

Acute intermittent porphyria (AIP), an inherited disease of heme biosynthesis, is one of the most common type of the porphyrias. Reduced activity of the enzyme

关键词： human porphobilinogen deaminase X-ray structure heme biosynthesis porphobilinogen hinge

GPU-accelerated phase field simulation of directional solidification

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Science China(Technological Sciences) 2014年第6期57卷 1191-1197页

作者： gao ang HU YanSu Wang ZhiJun MU DeJun LI JunJie Wang JinCheng School of Electronics and Information Northwestern Polytechnical University School of Automation Northwestern Polytechnical University State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The phase field simulation has been actively studied as a powerful method to investigate the microstructural evolution during the ***,it is a great challenge to perform the phase field simulation in large length and time *** developed graphics processing unit(GPU)calculation is used in the phase filed simulation,greatly accelerating the calculation *** results show that the computation with GPU is about 36 times faster than that with a single Central Processing Unit(CPU)*** provides the feasibility of the GPU-accelerated phase field simulation on a desktop *** GPU-accelerated strategy will bring a new opportunity to the application of phase field simulation.

关键词： phase field simulation directional solidification graphics processing unit(GPU) acceleration computer unified device architecture(CUDA) speed-up ratio

Origin of the low formation energy of oxygen vacancies in CeO_(2)

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Chinese Physics B 2022年第10期31卷 488-492页

作者： Han Xu Tongtong Shang Xuefeng Wang ang gao Lin Gu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Oxygen vacancies play a crucial role in determining the catalytic properties of Ce-based catalysts,especially in oxidation *** design of catalytic activity requires keen insight into oxygen vacancy formation *** this work,we investigate the origin of oxygen vacancies in CeO_(2)from the perspective of electron density via high-energy synchrotron powder x-ray *** refinement results indicate that there is no obvious hybridization between bonded Ce and O atoms in CeO_(2).Subsequent quantitative topological analysis of the experimental total electron density reveals the closed-shell interaction behavior of the Ce-O *** results of first-principles calculation indicate that the oxygen vacancy formation energy of CeO_(2)is the lowest among three commonly used redox *** findings indicate the relatively weak bond strength of the Ce-O bond,which induces a low oxygen vacancy formation energy for CeO_(2)and thus promotes CeO_(2)as a superior catalyst for oxidation *** work provides a new direction for design of functional metal oxides with high oxygen vacancy concentrations.

关键词： CeO_(2) oxygen vacancy synchrotron x-ray diffraction electron-density distribution

Preliminary safety analysis for heavy water-moderated molten salt reactor

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Nuclear Science and Techniques 2024年第6期35卷 202-217页

作者： gao-ang Wen Jian-Hui Wu Chun-Yan Zou Xiang-Zhou Cai Jin-Gen Chen Man Bao College of Science University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The heavy water-moderated molten salt reactor(HWMSR)is a newly proposed reactor concept,in which heavy water is adopted as the moderator and molten salt dissolved with fissile and fertile elements is used as the *** arising from graphite in traditional molten salt reactors,including the positive temperature coefficient and management of highly radio-active spent graphite waste,can be addressed using the *** now,research on the HWMSR has been centered on the core design and nuclear fuel cycle to explore the viability of the HWMSR and its advantages in fuel ***,the core safety of the HWMSR has not been extensively ***,we evaluate typical accidents in a small modular HWMSR,including fuel salt inlet temperature overcooling and overheating accidents,fuel salt inlet flow rate decrease,heavy water inlet temperature overcooling accidents,and heavy water inlet mass flow rate decrease accidents,based on a neutronics and thermal-hydraulics coupled *** results demonstrated that the core maintained safety during the investigated accidents.

关键词： Heavy water-moderated molten salt reactor Neutronics and thermal-hydraulics coupling Transient analysis Accident analysis