Backscatter from the data plane – Threats to stability and security in information-centric network infrastructure

Information-centric networking (ICN) raises data objects to first class routable entities in the network and changes the Internet paradigm from host-centric connectivity to data-oriented delivery. However, current approaches to content routing heavily rely on data-driven protocol events and thereby introduce a strong coupling of the control to the data plane in the underlying routing infrastructure. In this paper, threats to the stability and security of the content distribution system are analyzed in theory, simulations, and practical experiments. We derive relations between state resources and the performance of routers, and demonstrate how this coupling can be misused in practice. We further show how state-based forwarding tends to degrade by decorrelating resources. We identify intrinsic attack vectors present in current content-centric routing, as well as possibilities and limitations to mitigate them. Our overall findings suggest that major architectural refinements are required prior to global ICN deployment in the real world.     

Second-order terminal sliding mode control for hypersonic vehicle in cruising flight with sliding mode disturbance observer

This paper focuses on the design of nonlinear robust controller and disturbance observer for the longitudinal dynamics of a hypersonic vehicle (HSV) in the presence of parameter uncertainties and external disturbances. First, by combining terminal sliding mode control (TSMC) and second-order sliding mode control (SOSMC) approach, the secondorder terminal sliding control (2TSMC) is proposed for the velocity and altitude tracking control of the HSV. The 2TSMC possesses the merits of both TSMC and SOSMC, which can provide fast convergence, continuous control law and hightracking precision. Then, in order to increase the robustness of the control system and improve the control performance, the sliding mode disturbance observer (SMDO) is presented. The closed-loop stability is analyzed using the Lyapunov technique. Finally, simulation results illustrate the effectiveness of the proposed method, as well as the improved overall performance over the conventional sliding mode control (SMC).     

基于无线网络的森林防火系统的研究与改进

论文针对现行的无线传感器技术方式的森林防火系统中的弊端,提出了一种改进的系统设计方案.改进后的方案主要采用二级Ad-Hoc模式的网络,对传统的无线传感器进行有效的改造的同时,也增加了稳定可靠的中心网络节点,无线通信网络采用改进后的AODV作为多跳路由协议,中心节点的数据处理采用卡尔曼滤波预处理,数据发送采用ALOHA机制进行随机延迟发送.系统经过反复实验,最终验证并总结出一套可以有效应用于实际工程中的系统部署方案.     

IPv6单播路由协议的新特性与应用研究

当前中小城市的下一代互联网建设比较迟缓,主要原因是对IPv6路由协议认识不足,缺少组网实践经验和工程技术指导。文中详细阐述了IPv6单播路由协议具备的新特性和工作机制,包括常用RIPng、OSPFv3、IPv6-IS-IS和BGP4+,使用思科仿真软件平台分别应用上述几种路由协议开展不同场景下的组网应用,设计了典型网络方案,给出了配置中的关键代码并分析了路由协议的运行状态和路由信息。仿真实验验证了IPv6单播路由协议的新特性,具有较好的工程技术实用价值,有助于促进现实IPv4网络向IPv6过渡的进程。     

Path planning in complex 3D environments using a probabilistic roadmap method

This paper presents a 3D path planning algorithm for an unmanned aerial vehicle （UAV） in complex environments. In this algorithm, the environments are divided into voxels by octree algorithm. In order to satisfy the safety requirement of the UAV, free space is represented by free voxels, which have enough space margin for the UAV to pass through. A bounding box array is created in the whole 3D space to evaluate the free voxel connectivity. The probabilistic roadmap method （PRM） is improved by random sampling in the bounding box array to ensure a more efficient distribution of roadmap nodes in 3D space. According to the connectivity evaluation, the roadmap is used to plan a feasible path by using A＊ algorithm. Experimental results indicate that the proposed algorithm is valid in complex 3D environments.     

Normalized Efficient Routing Protocol for WSN

WSNs （wireless sensor networks） consist of thousands of tiny nodes having the capability of sensing, computation, and wireless communications. Unfortunately these devices are limited energy devices, that is means we must save energy as much as possible, to increase network life time as long as possible. In this paper we introduce NEER--normalized energy efficient routing protocol that increases network life time through switching between AODV protocol that depends on request-reply routing, and MRPC that depends on residual battery in routing.     

无人水面艇嵌入式基础运动控制系统研究

从硬件和软件两方面详细地讨论了无人水面艇嵌入式基础运动控制系统的体系结构.该运动控制系统采用了便于调试和监控的底层工控机和顶层控制机相结合的模式.同时详细阐述了无人水面艇基础运动控制系统的控制任务划分、运动控制实现、控制算法等流程.最后通过仿真试验表明,整个嵌入式基础运动控制系统满足可行性和可靠性要求.     

OSEK/VDX嵌入式实时操作系统在汽车稳定性控制器中的应用

根据OSEK/VDX标准设计嵌入式实时操作系统,侧重于任务管理,资源管理部分的实现。并在自主开发的汽车稳定性控制器硬件在环仿真平台上进行验证。实验结果表明,在该操作系统上开发系统可以有效地提高实时性和稳定性,能够满足汽车稳定性控制器的要求。     

基于3D Mesh结构的一种静态路由算法

3D NoC在同构多核系统中相比2D NoC具有更为优越的性能.本文在研究3D Mesh结构的基础上,对拓扑结构中的平均延时和理想吞吐量进行了理论上的评估,并提出了一种基于3D Mesh的新的静态路由算法,最后运用NS2网络仿真软件对其进行仿真和比较.实验结果显示,新的路由算法可以有效地提高吞吐量,并在大规模数据传输时...     

基于蚁群优化的AdHoc网络生存时间和其他网络性能平衡路由协议

本文提出了基于蚁群优化(ACO)算法的Ad Hoc网络生存时间和其他网络性能平衡路由协议(ABEAR)。协议按需发送人工蚂蚁进行路由发现,综合节点残留的信息素浓度、下一跳节点剩余能量、节点周围链路质量和拥塞情况选择下一跳节点来转发数据包,尽量避开信道使用频率较高的路径,减少了因信道冲突、数据包丢失和数据包重传所造成的能量损失,还缩短了网络传输时延,提高了网络吞吐量。协议还采用跨层机制根据MAC层通信活动情况,在保证网络连通性的前提下使部分空闲节点转入睡眠状态来节省能量消耗。仿真表明,与AODV协议相比,ABEAR协议在网络生存时间、数据包交付率和端到端平均时延方面均有较大改善。