Virtual network embedding problem which is NP-hard is a key issue for implementing software-defined network which is brought about by network virtualization. Compared with other studies which focus on designing heuris...Virtual network embedding problem which is NP-hard is a key issue for implementing software-defined network which is brought about by network virtualization. Compared with other studies which focus on designing heuristic algorithms to reduce the hardness of the NP-hard problem we propose a robust VNE algorithm based on component connectivity in large-scale network. We distinguish the different components and embed VN requests onto them respectively. And k-core is applied to identify different VN topologies so that the VN request can be embedded onto its corresponding component. On the other hand, load balancing is also considered in this paper. It could avoid blocked or bottlenecked area of substrate network. Simulation experiments show that compared with other algorithms in large-scale network, acceptance ratio, average revenue and robustness can be obviously improved by our algorithm and average cost can be reduced. It also shows the relationship between the component connectivity including giant component and small components and the performance metrics.展开更多
Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for ...Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for assembly purpose, is presented, and virtual-part-basedconnecting element modeling is proposed. During the assembly modeling, base parts are modified bythe Boolean subtraction between the virtual part and the part to be connected. Dynamic matchingalgorithm, which is based on list database, is designed for dynamic extension and off-line editingof connecting part and virtual part, and design rules of connecting element is encapsulated by thevirtual part. A prototyped software module for rapid design of connecting elements is implementedunder self-developed CAD/CAM platform-SuperMan.展开更多
The network services today require extremely agile and mobile, however, the traditional IP infrastructures are so rigid that cannot fit services well. A way should be put forward to automate the network to improve res...The network services today require extremely agile and mobile, however, the traditional IP infrastructures are so rigid that cannot fit services well. A way should be put forward to automate the network to improve responsiveness to change. SDN and network virtualization(NV) are two hottest approaches to make networking more automated and scalable to support virtualized and cloud environments. Network virtualization combines hardware and software network resources and network functionality into a single virtual network. SDN is created to simplify traffic management and achieve operational efficiencies by establish and exercising central control over packet forwarding. In this paper, we focus on the situation where SDN controller needs to connect two virtual networks temporarily. We put forward three algorithms to try to make this connection more effective and evaluate these three algorithms.展开更多
针对目前智能网联汽车测试软件在环测试环节尚未成熟的问题,提出一种基于SUMO的智能网联汽车测试环境。上述测试环境依托交通流仿真软件SUMO(Simulation of Urban Mobility)平台,使用MATLAB/Simulink对车辆动力学进行仿真;使用罗技方向...针对目前智能网联汽车测试软件在环测试环节尚未成熟的问题,提出一种基于SUMO的智能网联汽车测试环境。上述测试环境依托交通流仿真软件SUMO(Simulation of Urban Mobility)平台,使用MATLAB/Simulink对车辆动力学进行仿真;使用罗技方向盘与Simulink采集驾驶员操作信息;在Unity3D中与SUMO同步环境场景并实现3D视觉效果。使用虚拟驾驶设备和联合汽车电子公司成熟的智能网联功能对环境进行了验证,结果表明,新开发的测试系统建立的虚拟车辆可以遵循驾驶员驾驶意图,同时能够给通用智能网联汽车软件提供软件在环测试环境,进行模块化测试,测试结果准确,试验数据可靠,整套系统反应灵敏、操作安全、沉浸感较强。展开更多
基金supported in part by the National Natural Science Foundation of China under Grant No.61471055
文摘Virtual network embedding problem which is NP-hard is a key issue for implementing software-defined network which is brought about by network virtualization. Compared with other studies which focus on designing heuristic algorithms to reduce the hardness of the NP-hard problem we propose a robust VNE algorithm based on component connectivity in large-scale network. We distinguish the different components and embed VN requests onto them respectively. And k-core is applied to identify different VN topologies so that the VN request can be embedded onto its corresponding component. On the other hand, load balancing is also considered in this paper. It could avoid blocked or bottlenecked area of substrate network. Simulation experiments show that compared with other algorithms in large-scale network, acceptance ratio, average revenue and robustness can be obviously improved by our algorithm and average cost can be reduced. It also shows the relationship between the component connectivity including giant component and small components and the performance metrics.
基金This project is supported by High Technology Research and Development Program of China (No.2002A411030).
文摘Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for assembly purpose, is presented, and virtual-part-basedconnecting element modeling is proposed. During the assembly modeling, base parts are modified bythe Boolean subtraction between the virtual part and the part to be connected. Dynamic matchingalgorithm, which is based on list database, is designed for dynamic extension and off-line editingof connecting part and virtual part, and design rules of connecting element is encapsulated by thevirtual part. A prototyped software module for rapid design of connecting elements is implementedunder self-developed CAD/CAM platform-SuperMan.
基金supported under the National High Technology Research and Development Program(863)of China(No.2015AA016101)the National Natural Science Funds(No.61300184+1 种基金61302089)Beijing Nova Program(No.Z151100000315078)
文摘The network services today require extremely agile and mobile, however, the traditional IP infrastructures are so rigid that cannot fit services well. A way should be put forward to automate the network to improve responsiveness to change. SDN and network virtualization(NV) are two hottest approaches to make networking more automated and scalable to support virtualized and cloud environments. Network virtualization combines hardware and software network resources and network functionality into a single virtual network. SDN is created to simplify traffic management and achieve operational efficiencies by establish and exercising central control over packet forwarding. In this paper, we focus on the situation where SDN controller needs to connect two virtual networks temporarily. We put forward three algorithms to try to make this connection more effective and evaluate these three algorithms.
文摘针对目前智能网联汽车测试软件在环测试环节尚未成熟的问题,提出一种基于SUMO的智能网联汽车测试环境。上述测试环境依托交通流仿真软件SUMO(Simulation of Urban Mobility)平台,使用MATLAB/Simulink对车辆动力学进行仿真;使用罗技方向盘与Simulink采集驾驶员操作信息;在Unity3D中与SUMO同步环境场景并实现3D视觉效果。使用虚拟驾驶设备和联合汽车电子公司成熟的智能网联功能对环境进行了验证,结果表明,新开发的测试系统建立的虚拟车辆可以遵循驾驶员驾驶意图,同时能够给通用智能网联汽车软件提供软件在环测试环境,进行模块化测试,测试结果准确,试验数据可靠,整套系统反应灵敏、操作安全、沉浸感较强。
