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Cramer-Rao bound and signal-to-noise ratio gain in distributed coherent aperture radar

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Journal of Systems Engineering and Electronics 2014年第2期25卷 217-225页

作者： Peilin Sun jun tang Xiaowei tang Department of Electronic Engineering Tsinghua University

This paper studies the estimation performance of the coherent processing parameter （CPP）, including time delay differences and phase synchronization errors among different apertures of the distributed coherent aperture radar （DCAR）. Firstly, three architectures of signal processing in the DCAR are introduced. Secondly, the closed-form Cramer-Rao bound （CRB） of the CPP estimation is derived and compared. Then, the closed-form CRB is verified by numerical simulations. Finally, when the next generation radar works in a fully coherent mode, the closed-form signal-to-noise ratio （SNR） gain of the three architectures is presented.

关键词： Cramer-Rao bound (CRB) joint parameter estimation,distributed coherent aperture radar (DCAR).

Photothermal probiotics delivery of photodynamic agents for enhanced immunogenic cell death within hypoxia center of solid tumors

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Nano Research 2025年第1期18卷 642-652页

作者： Wen Luo Shiyu Du Yateng Jiang Bangshun He jun tang Jingjing Yang Yujun Song Jiangsu Key Laboratory of Artificial Functional Materials State Key Laboratory of Analytical Chemistry for Life ScienceNational Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Department of Laboratory Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006China Department of Anesthesiology Jinling HospitalMedical School of Nanjing UniversityNanjing 210000China Department of Biochemistry and Molecular Biology School of Medicine&Holistic Integrative MedicineJiangsu Collaborative Innovation Center of Chinese Medicinal Resources IndustrializationNanjing University of Chinese MedicineNanjing 210023China

Resulting from harsh hypoxic environmental conditions,central cells in the core of solid tumors are usually more aggressive and malignant with a less stable ***,therapeutic agents with improved penetration for the activation of immunity in tumor centers exhibit promising potential in ***,polydopamine-coated Escherichia coli Nissle 1917(EcN)bearing chlorin e6(Ce6)-loaded and polyethyleneimine(PEI)-coated hollow manganese dioxide(shorted as EP-ChP)are applied for enhanced immunotherapy in deep *** accumulation in tumor center through hypoxia targeting,manganese dioxide is degradated under the tumor microenvironment with released Ce6 and thus generates reactive oxygen species(ROS)upon 660 nm laser irradiation,which can further lower thermalresistance of cancer cells via HSP90α*** to that,heating induced by polydopamine upon 808 nm laser irradiation can achieve effective tumor *** upon dual laser induces enhanced immunogenic cell death,while bacterial infections in tumor tissues also trigger innate *** bacteria-based approach provides enhanced antitumor immune responses in deep tumors with great potential in the reshaping of immunosuppression tumor microenvironment.

关键词： bacteria phototherapies immunotherapy hypoxia targeting tumor penetration

Target models and waveform design for detection in MIMO radar

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Science China(Information Sciences) 2014年第1期57卷 268-279页

作者： tang jun LUO jun tang Bo DU JinSong Electronic Engineering Department of Tsinghua University China Marine Development & Research Center Shenyang Institute of Automation Chinese Academy of Sciences

In this paper,we propose a general target model for multiple-input multiple-output(MIMO)*** types of targets are *** each type of target,we develop a corresponding optimum waveform designing method to optimize detection *** on Chernof-Stein lemma,we use relative entropy as the performance *** show that the optimum waveform designing method can obtain better detection performance than traditional orthogonal waveform designing method.

关键词： MIMO radar waveform designing relative entropy

Mass transport model of ions within biofilms under the effect of external field

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Journal of Environmental Sciences 2006年第3期18卷 604-609页

作者： WANG jun tang Xue-xi College of Life Science and Technology Ocean University of China Qingdao 266003 China

A mass transport model was developed to predict the transport rate of ions within biofilms, which was experimentally verified using the fluxes of NH4^＋ and Ca^2＋ through the heterotrophic biofilms with the thickness varying from 230 to 1430μm under the effect of external field in the range of-20 V/m to 60 V/m. It is found that the result predicted by the model is in agreement with the experimentally obtained one, with the error less than 5 percent for the thin biofilms. The error increases with the increase of the biofilm thickness. The transport rate of ions caused by electric migration is affected by the charges, field strength, and biofilm thickness and so on.

关键词： biofilms external field mass transport

Review on artificial intelligence techniques for improving representative air traffic management capability

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Journal of Systems Engineering and Electronics 2022年第5期33卷 1123-1134页

作者： tang jun LIU Gang PAN Qingtao College of Systems Engineering National University of Defense TechnologyChangsha 410073China School of InformationScience and Engineering Hunan Institute of Science and TechnologyYueyang 414000China

The use of artificial intelligence(AI)has increased since the middle of the 20th century,as evidenced by its applications to a wide range of engineering and science *** traffic management(ATM)is becoming increasingly automated and autonomous,making it lucrative for AI *** paper presents a systematic review of studies that employ AI techniques for improving ATM capability.A brief account of the history,structure,and advantages of these methods is provided,followed by the description of their applications to several representative ATM tasks,such as air traffic services(ATS),airspace management(AM),air traffic flow management(ATFM),and flight operations(FO).The major contribution of the current review is the professional survey of the AI application to ATM alongside with the description of their specific advantages:(i)these methods provide alternative approaches to conventional physical modeling techniques,(ii)these methods do not require knowing relevant internal system parameters,(iii)these methods are computationally more efficient,and(iv)these methods offer compact solutions to multivariable *** addition,this review offers a fresh outlook on future *** is providing a clear rationale for the model type and structure selection for a given ATM *** is to understand what makes a specific architecture or algorithm effective for a given ATM *** are among the most important issues that will continue to attract the attention of the AI research community and ATM work teams in the future.

关键词： artificial intelligence(AI) air traffic management(ATM) air traffic services(ATS) airspace management(AM) air traffic flow management(ATFM) flight operations(FO)

A Review on Representative Swarm Intelligence Algorithms for Solving Optimization Problems:Applications and Trends

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IEEE/CAA Journal of Automatica Sinica 2021年第10期8卷 1627-1643页

作者： jun tang Gang Liu Qingtao Pan College of Systems Engineering National University of Defense TechnologyChangsha 410000China School of Information Science and Engineering Hunan Institute of Science and TechnologyYueyang 414000China

Swarm intelligence algorithms are a subset of the artificial intelligence(AI)field,which is increasing popularity in resolving different optimization problems and has been widely utilized in various *** the past decades,numerous swarm intelligence algorithms have been developed,including ant colony optimization(ACO),particle swarm optimization(PSO),artificial fish swarm(AFS),bacterial foraging optimization(BFO),and artificial bee colony(ABC).This review tries to review the most representative swarm intelligence algorithms in chronological order by highlighting the functions and strengths from 127 research *** provides an overview of the various swarm intelligence algorithms and their advanced developments,and briefly provides the description of their successful applications in optimization problems of engineering ***,opinions and perspectives on the trends and prospects in this relatively new research domain are represented to support future developments.

关键词： Ant colony optimization(ACO) artificial bee colony(ABC) artificial fish swarm(AFS) bacterial foraging optimization(BFO) optimization particle swarm optimization(PSO) swarm intelligence

Transition of electric activity of neurons induced by chemical and electric autapses

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Science China(Technological Sciences) 2015年第6期58卷 1007-1014页

作者： SONG XinLin WANG ChunNi MA jun tang jun Department of Physics Lanzhou University of Technology College of Science China University of Mining and Technology

Autapse connected to the neuron can change the electric activity of neuron. The effect of autapse on neuronal activity is often described by adding an additive forcing current along a close loop, which is described by a time-delayed feedback on the membrane potential. Neuron often responds to electric autapse forcing sensitively and quickly, while the chemical autapse changes the electric activity of neuron slowly. By applying external forcing, a shift transition of electric activity can be more easily induced by the electric autapse than the chemical autapse. Our results confirm that chemical autapse can enhance and/or suppress the transition of electric activity with excitable or inhibitory type driven by electric autapse, vice versa. It indicates that an appropriate switch-off-on for autapse can make the neuron give different types of response to external forcing. Particularly, cooperation and competition between chemical and electric autapse help neuron response to external forcing in the most reliable way.

关键词： autapse neuron spiking bursting

Noise and delay sustained chimera state in small world neuronal network

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Science China(Technological Sciences) 2019年第7期62卷 1134-1140页

作者： tang jun ZHANG Juan MA jun LUO JinMing School of Physics China University of Mining and Technology Xuzhou 221116 China Department of Physics Lanzhou University of Technology Lanzhou 730050 China School of Mathematics China University of Mining and Technology Xuzhou 221116 China

Chimera state in neuronal network means the coexistence of synchronized and desynchronized firing patterns. It attracts much attention recently due to its possible relevance to the phenomenon of unihemispheric sleep in mammals. In this paper, we search for chimera state in a noisy small-world neuronal network, in which the neurons are delayed coupled. We found both transient and permanent chimera state when time delay is close to a critical value. The chimera state occurs due to the competition between the synchronized and desynchronized patterns in the neuronal network. On the other hand, intermediate intensity of noise facilitates the occurrence of delay-sustained chimera states. Comparison between noise and delay shows that time delay is the key factor determining the chimera state, whereas noise is a subordinate one.

关键词： delay noise chimera state neuronal network

Unpinning the spiral waves by using parameter waves

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Chinese Physics B 2021年第5期30卷 682-686页

作者： Lu Peng jun tang School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China

The spiral waves anchored to heterogeneous areas are more difficult to control and eliminate than freely rotating ones in homogenous *** eliminate pinned spiral waves,the resistant force should be provided to resist the pinning *** than advection field,we introduce parametric wave to play the role of providing resistant *** is found that the parametric wave with large enough amplitude and proper frequency can unpin and eliminate the spiral wave *** capability of parametric wave in providing resistant force is dependent on its amplitude and frequency *** the basis of parametric wave,the dependence of pinning force on the size and level of heterogeneity is further confirmed.

关键词： pinned spiral wave heterogeneity pinning force