交通事故已经成为威胁人民生命和财产安全的社会公害之一,车联网(Internet of Vehicles,IoV)作为能够有效增加道路安全的新兴技术,在道路交通安全防控方面扮演着至关重要的角色,在广泛应用的同时也面临着严峻的网络攻击挑战.为分析IoV...交通事故已经成为威胁人民生命和财产安全的社会公害之一,车联网(Internet of Vehicles,IoV)作为能够有效增加道路安全的新兴技术,在道路交通安全防控方面扮演着至关重要的角色,在广泛应用的同时也面临着严峻的网络攻击挑战.为分析IoV系统可靠性对道路安全水平的影响,设计了基于马尔可夫过程的双人随机博弈模型,将受到攻击的IoV系统分为渗透阶段、破坏阶段与主动恢复阶段,基于IoV系统受攻击后的状态转移过程,研究了攻击者和防御者之间动态交互的影响及状态之间的级联关系.将IoV系统的安全部署成本划分为相互依赖的网络层和物理层两部分,在无法完全了解模型参数的情况下通过Minimax-Q算法预测攻击者行为,探究防御成功率与网络安全部署成本对攻击者策略的影响,评价了不同攻击策略下的系统可靠性(车辆系统平均失败时间、车辆系统稳态可用性和道路信息稳态机密性),并构建了车联网环境下的道路交通安全综合指标,探析了IoV系统网络安全对道路交通安全水平的影响.研究结果表明:(1)在渗透阶段,相比于网络层,物理层安全部署成本的变化对攻击策略的影响更为显著,在破坏阶段则呈相反趋势.(2)在应用受损状态下,车辆系统稳态可用性,道路信息稳态机密性和道路交通安全综合水平分别上升了3.9%、3.9%和1.34%.(3)渗透阶段(N,V,P)为IoV系统可靠性对道路交通安全水平影响方面的关键阶段,极大程度上威胁着道路交通安全.以期该研究成果有助于确定IoV系统网络安全的关键阶段,并增强道路交通安全水平.展开更多
In this study, aiming at the characteristics of randomness and dynamics in Wearable Audiooriented BodyNets （WA-BodyNets）, stochastic differential game theory is applied to the investigation of the problem of transm...In this study, aiming at the characteristics of randomness and dynamics in Wearable Audiooriented BodyNets （WA-BodyNets）, stochastic differential game theory is applied to the investigation of the problem of transmitted power control inconsumer electronic devices. First, astochastic differential game model is proposed for non-cooperative decentralized uplink power control with a wisdom regulation factor over WA-BodyNets with a onehop star topology.This model aims to minimize the cost associated with the novel payoff function of a player, for which two cost functions are defined： functions of inherent power radiation and accumulated power radiation darmge. Second, the feedback Nash equilibrium solution of the proposed model and the constraint of the Quality of Service （QoS） requirement of the player based on the SIR threshold are derived by solving the Fleming-Bellman-Isaacs partial differential equations. Furthermore, the Markov property of the optimal feedback strategies in this model is verified.The simulation results show that the proposed game model is effective and feasible for controlling the transmitted power of WA-BodyNets.展开更多
文摘交通事故已经成为威胁人民生命和财产安全的社会公害之一,车联网(Internet of Vehicles,IoV)作为能够有效增加道路安全的新兴技术,在道路交通安全防控方面扮演着至关重要的角色,在广泛应用的同时也面临着严峻的网络攻击挑战.为分析IoV系统可靠性对道路安全水平的影响,设计了基于马尔可夫过程的双人随机博弈模型,将受到攻击的IoV系统分为渗透阶段、破坏阶段与主动恢复阶段,基于IoV系统受攻击后的状态转移过程,研究了攻击者和防御者之间动态交互的影响及状态之间的级联关系.将IoV系统的安全部署成本划分为相互依赖的网络层和物理层两部分,在无法完全了解模型参数的情况下通过Minimax-Q算法预测攻击者行为,探究防御成功率与网络安全部署成本对攻击者策略的影响,评价了不同攻击策略下的系统可靠性(车辆系统平均失败时间、车辆系统稳态可用性和道路信息稳态机密性),并构建了车联网环境下的道路交通安全综合指标,探析了IoV系统网络安全对道路交通安全水平的影响.研究结果表明:(1)在渗透阶段,相比于网络层,物理层安全部署成本的变化对攻击策略的影响更为显著,在破坏阶段则呈相反趋势.(2)在应用受损状态下,车辆系统稳态可用性,道路信息稳态机密性和道路交通安全综合水平分别上升了3.9%、3.9%和1.34%.(3)渗透阶段(N,V,P)为IoV系统可靠性对道路交通安全水平影响方面的关键阶段,极大程度上威胁着道路交通安全.以期该研究成果有助于确定IoV系统网络安全的关键阶段,并增强道路交通安全水平.
基金the National Natural Science Foundation of China under Grants No.61272506,No.61170014，the Foundation of Key Program of MOE of China under Grant No.311007，the Natural Science Foundation of Beijing under Grant No.4102041
文摘In this study, aiming at the characteristics of randomness and dynamics in Wearable Audiooriented BodyNets （WA-BodyNets）, stochastic differential game theory is applied to the investigation of the problem of transmitted power control inconsumer electronic devices. First, astochastic differential game model is proposed for non-cooperative decentralized uplink power control with a wisdom regulation factor over WA-BodyNets with a onehop star topology.This model aims to minimize the cost associated with the novel payoff function of a player, for which two cost functions are defined： functions of inherent power radiation and accumulated power radiation darmge. Second, the feedback Nash equilibrium solution of the proposed model and the constraint of the Quality of Service （QoS） requirement of the player based on the SIR threshold are derived by solving the Fleming-Bellman-Isaacs partial differential equations. Furthermore, the Markov property of the optimal feedback strategies in this model is verified.The simulation results show that the proposed game model is effective and feasible for controlling the transmitted power of WA-BodyNets.
