在大规模网络环境下,主机面临的安全威胁也愈发多样.随着基于机器学习检测恶意文件的技术快速崛起,极大的提升了对恶意软件的检测能力,也迫使对手改变了攻击策略.其中"Living off the land"策略通过调用操作系统工具或者执行...在大规模网络环境下,主机面临的安全威胁也愈发多样.随着基于机器学习检测恶意文件的技术快速崛起,极大的提升了对恶意软件的检测能力,也迫使对手改变了攻击策略.其中"Living off the land"策略通过调用操作系统工具或者执行任务的自动化管理程序来实现恶意行为.威胁检测可以从父子进程的上下文中发现可疑行为,将父子进程链及其派生的相关事件看作无向图,应用监督学习XGBoost算法进行权重分配,生成无向加权图.最后使用社区发现算法从图中识别出更大的攻击序列,在MIRTE ATT&CK仿真攻击数据集上进行验证.展开更多
The software of behaviour-based algorithm~ was parted to several functional modules which represented different behaviours with different priorities. A basic algorithm with S-type arbiter and an improved algorithm wit...The software of behaviour-based algorithm~ was parted to several functional modules which represented different behaviours with different priorities. A basic algorithm with S-type arbiter and an improved algorithm with I-type arbiter were compared. The improved algorithm can reduce judging time and avoid some mistakes of the basic one. In mapping obstacles, the robot adjusted the spread angle according to different distances to obstacles in scaled vector field histogram （SVFH） algorithm, and then the robot turned more sharply in near obstacles than in far obstacles, which made the robot move more safely and smoothly in a cluttered room.展开更多
In order to understand the short-term response of private car owners to changes in the price of oil,a survey was conducted in Beijing after the gasoline price in China rose in June 2008.It showed that private car driv...In order to understand the short-term response of private car owners to changes in the price of oil,a survey was conducted in Beijing after the gasoline price in China rose in June 2008.It showed that private car drivers in Beijing reduced their trips in the one month period following the price adjustment.Certain trip characteristics and drivers' demographics significantly influenced price elasticity in the short term,including the purpose of the trip,the distance covered and the income of the car driver.展开更多
In the near future, active safety systems will take more control over the vehicle driving, even up to introducing fully autonomous vehicles. Nowadays, it is expected that the active safety systems will aid avoiding co...In the near future, active safety systems will take more control over the vehicle driving, even up to introducing fully autonomous vehicles. Nowadays, it is expected that the active safety systems will aid avoiding collisions much more efficiently than human drivers. These systems can protect not only the passengers, but also other road users. To mitigate collision, certain maneuvers （e.g., sudden braking, lane change, etc.） need to be done in a reasonably quick time. However, this may lead to low-g energy pulses. The latter fact, may cause unexpected and, in some cases, unwanted occupant body motion resulting even in OOP （out of position） postures. New patterns of occupant reactions in such cases are, to some extent, confirmed experimentally [1-3]. This paper evaluates the limits of standard ATDs （anthropometric test devices） and chosen human models in well established maneuver scenarios. Obtained results are compared with experimental data available in the literature. Drawbacks identify new challenges for the near future simulation based safety engineering. One scenario with combined conditions of emergency braking during lane change has been used as an example of OOP posture after maneuver.展开更多
The way that humans think about the earth certainly affects the way that they relate and behave towards the earth and all its life forms. The various ideologies or worldviews that humanity has experienced such as dual...The way that humans think about the earth certainly affects the way that they relate and behave towards the earth and all its life forms. The various ideologies or worldviews that humanity has experienced such as dualism, capitalism, holism, animism, ubuntu, ukama, vital force, colonialism, and so forth are all different ways of thinking and relating to the earth. The paper argues that dualistic ways of thinking or viewpoints that radically separate the human as distinct from the earth are hostile to both human and earth flourishing. It further argues that the ecological crisis which has witnessed the destruction and pollution of the ecosystems and other devastations cannot be solved when humans continue to see the earth as an object for conquest and exploitation. Using a critical hermeneutics method, the paper affirms that the African principle of relationality can help in mitigating the environmental crisis. It finds and concludes that if this principle is radically practiced, a better environment will be created.展开更多
Breakthroughs in the global governance of terrorism depend mainly on the development on the part of the international community of thorough and effective mechanisms.At present,global governance targets terrorism via f...Breakthroughs in the global governance of terrorism depend mainly on the development on the part of the international community of thorough and effective mechanisms.At present,global governance targets terrorism via four regimes:hegemonic governance;governance by international organizations;hybrid governance;and coordinated governance by major powers.These strategies have made a contribution to counter-terrorism,but they do have shortcomings.We start with the judgment that governance entities should adhere to the logic of consequences,the logic of appropriateness,the logic of emotion and the logic of habitus,and on this basis make a preliminary assessment of the global governance of terrorism.Present terrorism governance regimes tend to be based on the thinking of the logic of consequences with only partial implementation of the logic of appropriateness and no use,so far,of counterterrorism measures based on the logic of emotion and the logic of habitus.To address both the symptoms and root causes of terrorism,international society should encourage governance strategies that implement counter-terrorism measures based on the four types of logic above and should promote coordination and cooperation based on this platform.In this course,China could promote a more significant role in global terrorism governance for such counter-terrorism platforms as the United Nations,including the Security Council,and the Shanghai Cooperation Organization.展开更多
To simulate the nonlinear behavior of ferroelectric structures and devices under non-uniform electromechanical loadings,a domain-switching embedded electromechanical finite element method is developed in this paper.Fo...To simulate the nonlinear behavior of ferroelectric structures and devices under non-uniform electromechanical loadings,a domain-switching embedded electromechanical finite element method is developed in this paper.Following continuum assumption,the electromechanical behavior of each representative material point can be obtained by averaging the behavior of the local corresponding microstructure,e.g.42 domains used in this work.A new Double Gibbs free energy criterion for domain-switching is proposed to ensure the convergence and stability of the simulations on ferroelectrics under non-uniform field.Several computational examples are given to demonstrate that this nonlinear finite element method can yield reasonable and stable simulation results which can be used to explain some experimental results and assist the design of ferroelectric devices.展开更多
文摘在大规模网络环境下,主机面临的安全威胁也愈发多样.随着基于机器学习检测恶意文件的技术快速崛起,极大的提升了对恶意软件的检测能力,也迫使对手改变了攻击策略.其中"Living off the land"策略通过调用操作系统工具或者执行任务的自动化管理程序来实现恶意行为.威胁检测可以从父子进程的上下文中发现可疑行为,将父子进程链及其派生的相关事件看作无向图,应用监督学习XGBoost算法进行权重分配,生成无向加权图.最后使用社区发现算法从图中识别出更大的攻击序列,在MIRTE ATT&CK仿真攻击数据集上进行验证.
基金National Natural Science Foundation of China(No.60975059)Leading Academic Discipline Project of Shanghai Municipal Education Commission,China(No.J513032)Innovation Program of Shanghai Municipal Education Commission,China(No.09YZ343)
文摘The software of behaviour-based algorithm~ was parted to several functional modules which represented different behaviours with different priorities. A basic algorithm with S-type arbiter and an improved algorithm with I-type arbiter were compared. The improved algorithm can reduce judging time and avoid some mistakes of the basic one. In mapping obstacles, the robot adjusted the spread angle according to different distances to obstacles in scaled vector field histogram （SVFH） algorithm, and then the robot turned more sharply in near obstacles than in far obstacles, which made the robot move more safely and smoothly in a cluttered room.
基金supported by the Research Fund for the Dectoral Program of Higher Education (Grant no.20070001049)Beijing Science and Technology Commission (Grant no.D09040903670905)
文摘In order to understand the short-term response of private car owners to changes in the price of oil,a survey was conducted in Beijing after the gasoline price in China rose in June 2008.It showed that private car drivers in Beijing reduced their trips in the one month period following the price adjustment.Certain trip characteristics and drivers' demographics significantly influenced price elasticity in the short term,including the purpose of the trip,the distance covered and the income of the car driver.
文摘In the near future, active safety systems will take more control over the vehicle driving, even up to introducing fully autonomous vehicles. Nowadays, it is expected that the active safety systems will aid avoiding collisions much more efficiently than human drivers. These systems can protect not only the passengers, but also other road users. To mitigate collision, certain maneuvers （e.g., sudden braking, lane change, etc.） need to be done in a reasonably quick time. However, this may lead to low-g energy pulses. The latter fact, may cause unexpected and, in some cases, unwanted occupant body motion resulting even in OOP （out of position） postures. New patterns of occupant reactions in such cases are, to some extent, confirmed experimentally [1-3]. This paper evaluates the limits of standard ATDs （anthropometric test devices） and chosen human models in well established maneuver scenarios. Obtained results are compared with experimental data available in the literature. Drawbacks identify new challenges for the near future simulation based safety engineering. One scenario with combined conditions of emergency braking during lane change has been used as an example of OOP posture after maneuver.
文摘The way that humans think about the earth certainly affects the way that they relate and behave towards the earth and all its life forms. The various ideologies or worldviews that humanity has experienced such as dualism, capitalism, holism, animism, ubuntu, ukama, vital force, colonialism, and so forth are all different ways of thinking and relating to the earth. The paper argues that dualistic ways of thinking or viewpoints that radically separate the human as distinct from the earth are hostile to both human and earth flourishing. It further argues that the ecological crisis which has witnessed the destruction and pollution of the ecosystems and other devastations cannot be solved when humans continue to see the earth as an object for conquest and exploitation. Using a critical hermeneutics method, the paper affirms that the African principle of relationality can help in mitigating the environmental crisis. It finds and concludes that if this principle is radically practiced, a better environment will be created.
基金a phased outcome of the key National Social Science Fund project,"Study of the AntiTerrorism Situation,Mechanisms and Countermeasures Related to Xinjiang"(No.:15AZD018)chaired by Professor Yang Shu of the Central Asian Institute of Lanzhou University,and of the key research base team-building project "Study of Belt and Road Security Issues"(No.17LZUJBWTD002)the Central University Basic Research Operating Expenditure of Lanzhou University
文摘Breakthroughs in the global governance of terrorism depend mainly on the development on the part of the international community of thorough and effective mechanisms.At present,global governance targets terrorism via four regimes:hegemonic governance;governance by international organizations;hybrid governance;and coordinated governance by major powers.These strategies have made a contribution to counter-terrorism,but they do have shortcomings.We start with the judgment that governance entities should adhere to the logic of consequences,the logic of appropriateness,the logic of emotion and the logic of habitus,and on this basis make a preliminary assessment of the global governance of terrorism.Present terrorism governance regimes tend to be based on the thinking of the logic of consequences with only partial implementation of the logic of appropriateness and no use,so far,of counterterrorism measures based on the logic of emotion and the logic of habitus.To address both the symptoms and root causes of terrorism,international society should encourage governance strategies that implement counter-terrorism measures based on the four types of logic above and should promote coordination and cooperation based on this platform.In this course,China could promote a more significant role in global terrorism governance for such counter-terrorism platforms as the United Nations,including the Security Council,and the Shanghai Cooperation Organization.
基金supported by the National Natural Science Foundation of China(Grant Nos. 10702034,10732050,90816006 and 10820101048)the National Basic Research Program of China(Grant Nos.2007CB936803 and 2010CB832701)
文摘To simulate the nonlinear behavior of ferroelectric structures and devices under non-uniform electromechanical loadings,a domain-switching embedded electromechanical finite element method is developed in this paper.Following continuum assumption,the electromechanical behavior of each representative material point can be obtained by averaging the behavior of the local corresponding microstructure,e.g.42 domains used in this work.A new Double Gibbs free energy criterion for domain-switching is proposed to ensure the convergence and stability of the simulations on ferroelectrics under non-uniform field.Several computational examples are given to demonstrate that this nonlinear finite element method can yield reasonable and stable simulation results which can be used to explain some experimental results and assist the design of ferroelectric devices.
