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Honeypot Game Theory against DoS Attack in UAV Cyber

Computers, Materials & Continua 2023年第9期76卷 2745-2762页

作者： Shangting Miao Yang li Quan pan School of Cybersecurity Northwestern Polytechnical UniversityXi’an710129China School of Automation Northwestern Polytechnical UniversityXi’an710129China

A space called Unmanned Aerial Vehicle(UAV)cyber is a new environment where UAV,Ground Control Station(GCS)and business processes are *** of service(DoS)attack is a standard network attack method,especially suitable for attacking the UAV *** is a robust security risk for UAV cyber and has recently become an active research *** theory is typically used to simulate the existing offensive and defensive mechanisms for DoS attacks in a traditional *** addition,the honeypot,an effective security vulnerability defense mechanism,has not been widely adopted or modeled for defense against DoS attack UAV *** this motivation,the current research paper presents a honeypot game theorymodel that considersGCS andDoS attacks,which is used to study the interaction between attack and defense to optimize defense *** GCS and honeypot act as defenses against DoS attacks in this model,and both players select their appropriate methods and build their benefit function *** this basis,a hierarchical honeypot and G2A network delay reward strategy are introduced so that the defender and the attacker can adjust their respective strategies ***,by adjusting the degree of camouflage of the honeypot for UAV network services,the overall revenue of the defender can be effectively *** proposed method proves the existence of a mixed strategy Nash equilibrium and compares it with the existing research on no delay rewards and no honeypot defense *** addition,this method realizes that the UAV cyber still guarantees a network delay of about ten milliseconds in the presence of a DoS *** results demonstrate that our methodology is superior to that of previous studies.

关键词： UAV cyber security honeypot game-theoretical model DoS attack

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Magnesium-Based Materials for Energy Conversion and Storage

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Journal of Magnesium and Alloys 2021年第6期9卷 2224-2225页

作者： Qian li Xiaodong Peng Fusheng pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

The development of materials for energy conversion and storage systems is essential for the realization of the sustainable and low-carbon society for which China pledged the long-term strategic target to reach peak carbon dioxide(CO_(2))emissions before 2030 and achieve carbon neutrality by *** the progress in this field can improve the utilization of the intermittent harvested renewable energy.

关键词： energy. Storage carbon

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A novel method to avoid turning point singularities for the semi-regular hexagons Gough-Stewart parallel manipulator

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Science China(Technological Sciences) 2008年第7期51卷 897-910页

作者： WANG YuXin li YuTong pan ShuangXia College of Mechanical Engineering&Energy Zhejiang UniversityHangzhou 310027China

This paper presents a novel disturbance function method to avoid turning point singularities for the semi-regular hexagons 6-SPS Gough-Stewart manipulator. Through analysis of the configuration bifurcation characteristics of the manipulator at the type-II singular points, it is found that the type-II singularities under signal input parameter belong to turning point bifurcation. The configuration patterns for the manipulator to pass through the turning points are divided into three types: persistent, non-persistent and path configuration. Utilizing the universal unfolding approach, the configuration bifurcation characteristics under the perturbation pa- rameters applied to the extendable legs are analyzed. The investigation reveals that all configuration branches converged in the same singular point in the unperturbed system will be separated in the disturbed system. Based on this discovery, a novel method for the parallel manipulator to pass through the singular points with the desired configuration is presented. Then the disturbance functions for the manipulator to pass through the turning points with the persistent configuration and the non-persistent configuration are constructed. The method presented in this paper can be applied to avoiding the singularities in such cases where the path and orientation of the manipulator are strictly programmed.

关键词： parallel manipulator turning point singularity disturbance function

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Study on effects of thickness on airfoil-stall at low Reynolds numbers by cusp-catastrophic model based on GA(W)-1 airfoil

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Chinese Journal of Aeronautics 2020年第5期33卷 1444-1453页

作者： Zhiping li Peng ZHANG Tianyu pan Qiushi li Jian ZHANG National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Beihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beihang UniversityBeijing 100083China School of Energy and Power Engineering Beihang UniversityBeijing 100083China Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China

The phenomena of an airfoil stall present the behaviors of catastrophe and hysteresis at low Reynolds *** simulation results of two-dimensional airfoil GA(W)-1 show that the width of the hysteresis loop of airfoil stall will gradually decrease and even disappear with the decrease of thickness *** nonlinear characteristics are in accordance with the topological features of the cusp catastrophic *** to the topological invariant principle,a novel topological mapping method is developed to establish the mapping relationship between cusp catastrophic model and stall characteristics of the airfoil,then the effect of thickness ratio on airfoil stall is successfully described quantitatively by cusp catastrophic ***,based on the established topological mapping relationship,combined with the mean flow field of the airfoil stall,potential function approach of cusp catastrophic model is first introduced to interpret the catastrophe and hysteresis of the airfoil stall,and it is found that as the thickness ratio decreases,the system’s maximal potential energy gradually disappears,and the short separation bubble at the leading edge of the airfoil changes to long separation bubble,so the airfoil stall changes from a bistable system to a monostable system.

关键词： Airfoil Catastrophe theory Low Reynolds number Potential function Thickness ratio

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Aerodynamic/control integrated optimization method for unpowered high-speed vehicle configuration design

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Chinese Journal of Aeronautics 2024年第7期37卷 153-167页

作者： Xin pan linlin WANG li li Lulu JIANG Gang CHEN State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China Shannxi Key Laboratory for Environment and Control of Flight Vehicle School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China Beijing Institute of Space Long March Vehicle Beijing 100076China AVIC Xi’an Aeronautics Computing Technique Research Institute Xi’an 710068China

The unpowered high-speed vehicle experiences a significant coupling between the disciplines of aerodynamics and control due to its characteristics of high flight speed and extensive maneuverability within large *** conventional aircraft conceptual design process follows a sequential design approach,and there is an artificial separation between the disciplines of aerodynamics and control,neglecting the coupling effects arising from their *** a result,this design process often requires extensive iterations over long periods when applied to high-speed vehicles,and may not be able to effectively achieve the desired design *** enhance the overall performance and design efficiency of high-speed vehicles,this study integrates the concept of Active Control Technology(ACT)from modern aircraft into the philosophy of aerodynamic/control integrated *** integrated optimization strategies,with differences in coupling granularity,have been ***,these strategies are put into action on a biconical vehicle that operates at Mach *** results reveal that the comprehensive performance of the synthesis optimal model derived from the aerodynamic/control integrated optimization strategy is improved by 31.76%and 28.29%respectively compared to the base model under high-speed conditions,demonstrating the feasibility and effectiveness of the method and optimization strategies ***,in comparison to the single-stage strategy,the multi-stage strategy takes into deeper consideration the impact of control *** a result,the control performance of the synthesis opti-mal model derived from the multi-stage strategy improves by 13.99%,whereas the single-stage strategy only achieves a 5.79%*** method enables a fruitful interaction between aerodynamic configuration design and control system design,leading to enhanced overall performance and design ***,it improves the controllability of high-sp

关键词： Aerodynamic/Control Integrated Optimization MDO High-speed vehicle Shape Optimization Controllability

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Degradation and mineralization of 2-chlorophenol in a single-stage anaerobic fixed-bed bioreactor

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Science China(Technological Sciences) 2020年第1期63卷 86-95页

作者： GENG YiKun li ZhengHao YUAN li pan XinRong SHENG GuoPing CAS Key Laboratory of Urban Pollutant Conversion Department of Applied Chemistry University of Science and Technology of China

Chlorophenols(CPs) have drawn great attention due to their high toxicity and ubiquitous presence in the environment. However,the practical application of anaerobic biodegradation to remove CPs is limited by low degradation rate and incomplete mineralization. This work aims to apply a single-stage anaerobic fixed-bed bioreactor(An FBR) for complete anaerobic dechlorination and mineralization of CPs. Results showed that 2-CP removal efficiency of 99.4%, chemical oxygen demand(COD)removal efficiency of 93.0%, and methane yield of 0.22 L-CH4/g-COD could be obtained for a wide range of 2-CP loading rates(3.6–18.2 mmol L–1 d–1). Nearly complete anaerobic mineralization of 2-CP was achieved even in the absence of co-substrates,thereby greatly reducing the operation cost. This may be partly related to the attached-growth microorganisms in An FBR,allowing a higher biomass concentration and longer biomass retention time for enhanced 2-CP removal. Moreover, 16 S r RNA gene sequence analysis suggests that the An FBR harbored the potential dechlorinators(e.g., Anaeromyxobacter), phenoldegrading microbes(e.g., Comamonas and Syntrophobacter), and methanogens(e.g., Methanobacterium and Methanosaeta)after acclimation, which could cooperate effectively for 2-CP dechlorination and mineralization. Based on the identified intermediates, the possible mineralization pathway of 2-CP was proposed. These findings should be valuable to facilitate the engineering applications of An FBRs for removing CPs from wastewater.

关键词： anaerobic fixed-bed bioreactor chlorophenols degradation pathway intermediates mineralization

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A Pixel–Channel Hybrid Attention Model for Image Processing

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Tsinghua Science and Technology 2022年第5期27卷 804-816页

作者： Qiang Hua liyou Chen pan li Shipeng Zhao Yan li College of Mathematics and Information Science Hebei UniversityBaoding 071002China Research Center for Applied Mathematics and Interdisciplinary Sciences Beijing Normal UniversityZhuhai 519087China

In the field of image processing,better results can often be achieved through the deepening of neural network layers involving considerably more *** image classification,improving classification accuracy without introducing too many parameters remains a *** for image conversion,the use of the conversion model of the generative adversarial network often produces semantic artifacts,resulting in images with lower ***,to address the above problems,a new type of attention module is proposed in this paper for the first *** proposed approach uses the pixel-channel hybrid attention(PCHA) mechanism,which combines the attention information of the pixel and channel *** comparative results of using different attention modules on multiple-image data verify the superiority of the PCHA module in performing classification *** image conversion,we propose a skip structure(S-PCHA model) in the up-and down-sampling processes based on the PCHA *** proposed model can help the algorithm identify the most distinctive semantic object in a given image,as this structure effectively realizes the intercommunication of encoder and decoder ***,the results showed that the attention model could establish a more realistic mapping from the source domain to the target domain in the image conversion algorithm,thus improving the quality of the image generated by the conversion model.

关键词： deep learning attention mechanism image classification image processing convolutional neural networks

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Different effects of foliar application of silica sol on arsenic translocation in rice under low and high arsenite stress

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Journal of Environmental Sciences 2021年第7期33卷 22-32页

作者： Dandan pan Chuanping liu Jicai Yi Xiaomin li Fangbai li SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China School of Environment South China Normal UniversityGuangzhou 510006China College of life Sciences South China Agricultural UniversityGuangzhou 510642China

Foliar application of Si can generally reduce As translocation from roots to shoots in rice;however, it does not always work, particularly under high As stress. Here, the effects of foliar application of nanoscale silica sol on As accumulation in rice were investigated under low(2 μmol/L) and high(8 μmol/L) arsenite stress. The results revealed that foliar Si application significantly decreased the As concentration in shoots under low arsenite stress, but showed different effects under high arsenite stress after 7 days of incubation. The reduction in root-to-shoot As translocation under the 2 As + Si treatment was related to the down-regulation of Os Lsi1 and Os Lsi2 expression and up-regulation of Os ABCC1 expression in roots. In the 8 As + Si treatment, the expressions of Os Lsi1, Os Lsi2, and Os ABCC1 were significantly promoted, which resulted in substantially higher As accumulation in both the roots and shoots. In the roots, As predominantly accumulated in the symplasts(90.6%–98.3%), in which the majority of As was sequestered in vacuoles(79.0%–94.0%) under both levels of arsenite stress. Compared with that of the 8 As treatment, the 8 As + Si treatment significantly increased the As concentration in cell walls, but showed no difference in the vacuolar As concentration, which remained constant at approximately 69.1–71.7 mg/kg during days 4–7. It appeared that the capacity of root cells to sequester As in the vacuoles had a threshold, and the excess As tended to accumulate in the cell walls and transfer to the shoots via apoplasts under high arsenite stress. This study provides a better understanding of the different effects of foliar Si application on As accumulation in rice from the view of arseniterelated gene expression and As subcellular distribution in roots.

关键词： Gene expression Apoplast Symplast Vacuolar sequestration Cell wall

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On Leray's problem in an infinitely long pipe with the Navier-slip boundary condition

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Science China Mathematics 2024年第4期67卷 819-854页

作者： Zijin li Xinghong pan Jiaqi Yang School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjing 210044China School of Mathematics and Key Laboratory of Ministry of Industry and Information Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Mathematics and Statistics Northwestern Polytechnical UniversityXi'an 710129China

The original Leray’s problem concerns the well-posedness of weak solutions to the steady incompressible Navier-Stokes equations in a distorted pipe,which approach the Poiseuille flow subject to the no-slip boundary condition at spatial *** this paper,the same problem with the Navier-slip boundary condition instead of the no-slip boundary condition,is *** to the complexity of the boundary condition,some new ideas,presented as follows,are introduced to handle the extra difficulties caused by boundary ***,the Poiseuille flow in the semi-infinite straight pipe with the Navier-slip boundary condition will be introduced,which will serve as the asymptotic profile of the solution to the generalized Leray’s problem at spatial ***,a solenoidal vector function defined in the whole pipe,satisfying the Navierslip boundary condition,having the designated flux and equalling the Poiseuille flow at a large distance,will be carefully *** plays an important role in reformulating our ***,the energy estimates depend on a combined L2-estimate of the gradient and the stress tensor of the velocity.

关键词： stationary Navier-Stokes system Navier-slip boundary condition Leray's problem

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Three Series Theorem for Independent Random Variables under Sub-linear Expectations with Applications

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Acta Mathematica Sinica,English Series 2019年第2期35卷 172-184页

作者： Jia pan XU li Xin ZHANG School of Mathematical Sciences Zhejiang University

In this paper, motived by the notion of independent and identically distributed random variables under the sub-linear expectation initiated by Peng, we establish a three series theorem of independent random variables under the sub-linear expectations. As an application, we obtain the Marcinkiewicz's strong law of large numbers for independent and identically distributed random variables under the sub-linear expectations. The technical details are different from those for classical theorems because the sub-linear expectation and its related capacity are not additive.

关键词： Sub-linear expectation capacity Rosenthal's inequality Kolmogorov's three series theorem Marcinkiewicz's strong law of large numbers

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