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Moving target defense of routing randomization with deep reinforcement learning against eavesdropping attack

Digital Communications and Networks 2022年第3期8卷 373-387页

作者： Xiaoyu Xu Hao Hu Yuling Liu Jinglei Tan Hongqi Zhang Haotian song Academy of People’s Armed Police Beijing100012China PLA SSF Information Engineering University Zhengzhou450001China Institute of Information Engineering Chinese Academy of SciencesBeijing100093China School of Cyber Security University of Chinese Academy of SciencesBeijing101408China

Eavesdropping attacks have become one of the most common attacks on networks because of their easy implementation. Eavesdropping attacks not only lead to transmission data leakage but also develop into other more harmful attacks. Routing randomization is a relevant research direction for moving target defense, which has been proven to be an effective method to resist eavesdropping attacks. To counter eavesdropping attacks, in this study, we analyzed the existing routing randomization methods and found that their security and usability need to be further improved. According to the characteristics of eavesdropping attacks, which are “latent and transferable”, a routing randomization defense method based on deep reinforcement learning is proposed. The proposed method realizes routing randomization on packet-level granularity using programmable switches. To improve the security and quality of service of legitimate services in networks, we use the deep deterministic policy gradient to generate random routing schemes with support from powerful network state awareness. In-band network telemetry provides real-time, accurate, and comprehensive network state awareness for the proposed method. Various experiments show that compared with other typical routing randomization defense methods, the proposed method has obvious advantages in security and usability against eavesdropping attacks.

关键词： Routing randomization Moving target defense Deep reinforcement learning Deep deterministic policy gradient

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Chatter suppression techniques in milling processes:A state of the art review

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Chinese Journal of Aeronautics 2024年第7期37卷 1-23页

作者： Zhenmin LI Qinghua song Peijian JIN Zhanqiang LIU Bing WANG Haifeng MA Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationSchool of Mechanical EngineeringShandong UniversityJinan 250061China National Demonstration Center for Experimental Mechanical Engineering Education Shandong UniversityJinan 250061China

Chatter in the machining system can result in a decrease in tool life,poor surface finish,conservative cutting parameters,*** many review papers promoting the understanding and research of this area,chatter suppression techniques are generally discussed within limited pages in the framework of comprehensive chatter-related *** recent years,the developments of smart materials,advanced sensing techniques,and more effective control strategies have led to some new progress in chatter ***,the widely used thin-walled parts present more and more severe machining challenges in their milling *** the above deficiencies,this paper summarizes the current state of the art in milling chatter *** classifications of chatter suppression techniques are proposed according to the working principle and control *** on the new classified framework,the mechanism and comparisons of different chatter suppression strategies are ***,the current challenges and potential tendencies of milling chatter suppression techniques are ***,integration,compactness,adaptability to workpiece geometry,and the collaboration of multiple control methods are predicted to be important trends in the future.

关键词： Active control Chatter suppression Damping Milling Regenerative effect

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Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay,East Antarctica

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Journal of Oceanology and Limnology 2024年第5期42卷 1399-1414页

作者： Wenjun YE Lingqiao CHENG Yujiro KITADE song HU Juncheng ZUO College of Oceanography and Ecological Science Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Marine Ecological Monitoring and Restoration Technologies Ministry of Natural ResourcesShanghai 201306China Department of Ocean Sciences Tokyo University of Marine Science and TechnologyTokyo 108-8477Japan

The Antarctic Bottom Water formation site Vincennes Bay,East Antarctica is experiencing a substantial intrusion of modified Circumpolar Deep Water(mCDW),which may inhibit the formation of Dense Shelf Water(DSW)and drive basal melting of the ice *** on hydrographic data obtained from March to November in 2012,we evaluated the spatial spread of mCDW over the continental shelf region of Vincennes Bay and the associated temporal evolution of water properties,as well as the sea ice formation effect on water column in the coastal *** show that two branches of mCDW occupied the deep layers of the continental shelf,distinguished by the potential density(smaller than 27.8 kg/m^(3) or not)when potential temperatureθ=0.5°C in theθ-salinity *** warmer and less dense branch observed on the east plateau,accessed the eastern ice shelves in the coastal polynya to drive basal melting of ice *** contrast,the other colder and denser branch in the mid-depression reached the western Underwood Ice *** formation was detectable in the coastal polynya during September-November,proving the occurrence of deep *** heat loss and brine rejection during the intensive sea ice formation contributed to the destratification of the water column in the coastal *** was estimated that at least 1.11±0.79 TW heat carried by mCDW into the inner part of the polynya.

关键词： modified circumpolar deep water evolution of water properties coastal polynya ice shelf Vincennes Bay

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Has Global Division of Labor Increased Markup of Chinese Enterprises?

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China Finance and Economic Review 2021年第3期10卷 67-88页

作者： Jian song Jing Wang Politics and Economics Nanjing Audit University

The paper calculates the number of production stages for measurement of production segmentation,and discusses and depicts the microscopic impacts and effects of production segmentation of labor division of the global value chain on enterprise *** DLW method is used to calculate the markup of Chinese enterprises,the fi xed-effect model is used to analyze the impact of labor division of the global value chain on enterprise markup,and an instrumental variable method is constructed to relieve *** research findings show that enterprises have significantly increased their markup by choosing global production segmentation,international production segmentation and domestic production *** production segmentation can significantly increase the markup of low-productivity enterprises,hi-tech enterprises and private ***,low-productivity enterprises choose international production segmentation and hi-tech enterprises choose domestic production *** segmentation can offset to a certain extent low markup of export enterprises and domestic-oriented enterprises caused by the“competition effect”.In addition,enterprises’“technological progress effect”and“trade cost effect”are two possible channels by which production segmentation facilitates the increase of *** paper enriches and expands the literature about the impacts of labor division of the global value chain on enterprise markup,the robustness is analyzed from the perspectives of enterprise heterogeneity,industrial&technical heterogeneity and structure,and the impact mechanism is validated through the intermediate effect *** important findings are of important implications for solving the“low markup trap”of Chinese enterprises and enhancing labor division of the global value chain of enterprises.

关键词： enterprise markup number of production stages technological progress effect trade cost effect global value chain

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The Evolution Mechanism and Growth Effect of Urban Residents’ Consumption Structure Upgrading in China 36

The Evolution Mechanism and Growth Effect of Urban Residents...

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第36届中国控制会议

作者： Hao Sun Pingping song Beijing University of Posts and Telecommunications Beijing Open University

ISBN: (纸本)9781538629185

The dynamic evolution mechanism of urban consumption structure upgrading is studied based on the construction and application of variable parameters extended linear expenditure system（TVP-ELES model）.The growth effect of consumption structure upgrade is measured based on the theory of "demand creation".The research results show that consumption structure elements such as the basic needs coefficient of residents’ consumption,marginal consumption propensity and consumption flexibility change over time *** demand coefficient is decreasing *** marginal consumption tendency of consumption expenditure such as traffic communication,health care,education and cultural entertainment increases significantly,income elasticity and price elasticity vary greatly with *** change of consumption structure has the priority to consumption *** growth effect of consumption structure has obvious enhancement *** structure upgrading should focus on the effective coordination of the change of consumption demand and the gap between urban and rural areas.

关键词： Consumption structure evolution mechanism consumption growth prospects

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Numerical study on gas production via a horizontal well from hydrate reservoirs with different slope angles in the South China Sea

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Deep Underground Science and Engineering 2024年第2期3卷 171-181页

作者： Tingting Luo Jianlin song Xiang Sun Fanbao Cheng Madhusudhan Bangalore Narasimha Murthy Yulu Chen Yi Zhao Yongchen song School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhanChina Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalianChina Faculty of Engineering and the Environment University of SouthamptonSouthamptonUK

It is important to study the effect of hydrate production on the physical and mechanical properties of low-permeability clayey–silty reservoirs for the largescale exploitation of hydrate reservoirs in the South China *** this study,a multiphysical-field coupling model,combined with actual exploration drilling data and the mechanical experimental data of hydrate cores in the laboratory,was established to investigate the physical and mechanical properties of low-permeability reservoirs with different slope angles during 5-year hydrate production by the depressurization method via a horizontal *** result shows that the permeability of reservoirs severely affects gas production rate,and the maximum gas production amount of a 20-m-long horizontal well can reach186.8 m3/day during the 5-year hydrate *** with smaller slope angles show higher gas production *** depressurization propagation and hydrate dissociation mainly develop along the direction parallel to the ***,the mean effective stress of reservoirs is concentrated in the near-wellbore area with the on-going hydrate production,and gradually decreases with the increase of the slope *** from the effective stress distribution law,the total reservoir settlement amount first decreases and then increases with the increase of the slope *** maximum settlement of reservoirs with a 0°slope angle is up to 3.4 m,and the displacement in the near-wellbore area is as high as2.2 m after 5 years of hydrate *** is concluded that the pore pressure drop region of low-permeability reservoirs in the South China Sea is limited,and various slope angles further lead to differences in effective stress and strain of reservoirs during hydrate production,resulting in severe uneven settlement of reservoirs.

关键词： effective stress low‐permeability reservoirs natural gas hydrate production numerical simulation settlement slope angle the South China

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Three-dimensional Finite-time guidance Law with impact angle constraints 36

Three-dimensional Finite-time guidance Law with impact angle...

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第36届中国控制会议

作者： Yujie Si Shenmin song Harbin Institute of Technology

ISBN: (纸本)9781538629185

To intercept stationary targets at desired impact angle,the three-dimensional terminal guidance problem has been investigated in this *** from the traditional method of decoupling the engagement dynamics into two mutually orthogonal two-dimensional planes,the guidance law design is studied using three-dimensional coupled engagement *** of the short terminal guidance time,the finite-time convergence guidance law is proposed in this paper on the basis of the fast nonsingular terminal sliding mode control theory,which guarantees finite-time convergence to the desired impact *** simulations have demonstrated that the two guidance laws have effective performance and outperform the traditional terminal guidance laws.

关键词： Three-dimensional guidance law Terminal sliding mode control Impact angle constraint Finite-time guidance law

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Spatio-temporal Differentiation in the Incidence of Influenza and Its Relationship with Air Pollution in China from 2004 to 2017

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Chinese Geographical Science 2021年第5期31卷 815-828页

作者： song Yang ZHANG Yu WANG Tingting QIAN Sitong WANG Shijun School of Geographical Sciences Northeast Normal UniversityChangchun 130024China Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains Ministry of EducationChangchun 130024China

The Healthy China Initiative is a major health strategy being pursued by the *** prevent and control different types of diseases as well as their complex variants,research on the spatio-temporal differentiation among and mechanisms of influence of epidemic diseases is growing *** study analyzed monthly data on the incidence of influenza by using different methods,including Moran’s I,the hotspot analysis model,concentration analysis,and correlation analysis,to determine the characteristics of spatiotemporal differentiation in the incidence of influenza across prefecture-level cities in China from 2004 to 2017,and to examine its relationship with air *** to the results,the overall incidence of influenza in China exhibited a trend of increase from 2004 to 2017,with small peaks in 2009 and *** cases of influenza were recorded in the first and fourth quarters of each *** with higher incidences of influenza were concentrated in northwestern and northern China,and in the coastal areas of southeastern *** time,the distribution of regions with a higher incidence of influenza has shifted from the west to the east of the country.A significant relationship was observed between the incidence of influenza and factors related to air *** contents of five air pollutants(PM_(2.5),PM10,SO_(2),NO_(2),and CO)were significantly positively correlated with the incidence of influenza,with a decreasing order of contribution to it of SO_(2)>CO>NO_(2)>PM_(2.5)>PM_(10).The content of O_(3) in the air was negatively correlated with the incidence of *** influence of air pollution-related factors on the incidence of influenza in different regions and seasons showed minor *** large-scale empirical results provided here can supply a scientific basis for governmental disease control authorities to formulate strategies for regional prevention and control.

关键词： incidence of influenza spatio-temporal differentiation air pollution China

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Identification of FIR systems under difference-driven scheduled quantized observations

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Control Theory and Technology 2024年第2期22卷 163-172页

作者： Dong Liang Ruizhe Jia Fengwei Jing Yong song Jin Guo School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of Knowledge Automation for Industrial Processes Ministry of EducationBeijing100083China National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China

In networked system identification,how to effectively use communication resources and improve convergence speed is the focus of ***,there is an inherent contradiction between the two *** this paper,the event-driven communication is used to save communication resources for the identification of finite impulse response systems,and the input design is carried out to meet the requirements of convergence ***,a difference-driven communication is ***,the performance of the communication mechanism is analyzed,and the calculation method of its communication rate is *** that,according to the communication rate and the convergence rate of the identification algorithm,the input design problem is transformed into a constrained optimization problem,and the algorithm for finding the optimal solution is *** addition,considering the case that the output is quantized by multiple thresholds,the way to calculate its communication rate is given and the influence of threshold number on communication rate is ***,the effectiveness of the algorithm is verified by simulation.

关键词： System identification FIR system Difference-driven Quantized observation

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Afforestation with an age-sequence of Mongolian pine plantation promotes soil microbial residue accumulation in the Horqin Sandy Land, China

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Journal of Arid Land 2024年第4期16卷 567-579页

作者： GUO Jingwen song Xueshu WANG Xiao DU Zhangliu LU Sen State Key Laboratory of Efficient Production of Forest Resources Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037China College of Resources and Environmental Sciences China Agricultural UniversityBeijing 100193China

Land use change affects the balance of organic carbon(C)reserves and the global C *** residues are essential constituents of stable soil organic C(SOC).However,it remains unclear how microbial residue changes over time following *** this study,16-,23-,52-,and 62-year-old Mongolian pine stands and 16-year-old cropland were studied in the Horqin Sandy Land,*** analyzed changes in SOC,amino sugar content,and microbial parameters to assess how microbial communities influence soil C transformation and *** results showed that SOC storage increased with stand age in the early stage of afforestation but remained unchanged at about 1.27-1.29 kg/m2 after 52 ***,there were consistent increases in amino sugars and microbial residues with increasing stand *** stand age increased from 16 to 62 a,soil pH decreased from 6.84 to 5.71,and the concentration of total amino sugars increased from 178.53 to 509.99 mg/kg.A significant negative correlation between soil pH and the concentration of specific and total amino sugars was observed,indicating that the effects of soil acidification promote amino sugar stabilization during *** contrast to the Mongolian pine plantation of the same age,the cropland accumulated more SOC and microbial residues because of fertilizer *** Mongolian pine plantation with different ages,there was no significant change in calculated contribution of bacterial or fungal residues to SOC,suggesting that fungi were consistently the dominant contributors to SOC with increasing *** results indicate that afforestation in the Horqin Sandy Land promotes efficient microbial growth and residue accumulation in SOC stocks and has a consistent positive impact on SOC persistence.

关键词： soil organic matter stand age biomarker amino sugars microbial residues

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