This paper proposes an approach called PC-CORP (Power Control based Cooperative Opportunistic Routing Protocol) for WSN (Wireless Sensor Networks), providing robustness to the random variations in network connectivity...This paper proposes an approach called PC-CORP (Power Control based Cooperative Opportunistic Routing Protocol) for WSN (Wireless Sensor Networks), providing robustness to the random variations in network connectivity while ensuring better data forwarding efficiency in an energy efficient manner. Based on the realistic radio model, we combine the region-based routing, rendezvous scheme, sleep discipline and cooperative communication together to model data forwarding by cross layer design in WSN. At the same time, a lightweight transmission power control algorithm called PC-AIMD (Power Control Additive Increase Multiplicative Decrease) is introduced to utilize the co- operation of relay nodes to improve the forwarding efficiency performance and increase the robustness of the routing protocol. In the simulation, the performance of PC-COPR is investigated in terms of the adaptation of variations in network connectivity and satisfying the QoS requirements of application.展开更多
In this papert the routing problem in virtual circuit networks is considered. We consider the problem of choosing a path for each origin-destination pair to minimize the average delay encountered by packts. We give th...In this papert the routing problem in virtual circuit networks is considered. We consider the problem of choosing a path for each origin-destination pair to minimize the average delay encountered by packts. We give the usual formulation of this problem as a nonlinear combinatorial optimization problem. We present a genetic algorithm to solve this problem. Extensive computational results across a variety of networks are reported. These results indicate that our method outperforms the other methods in the literature.展开更多
In order to establish a unified construction land market, it is necessary to choose a rational pathway for the market transfer of Rural Collective Construction Land （RCCL） in China. This paper focuses on different m...In order to establish a unified construction land market, it is necessary to choose a rational pathway for the market transfer of Rural Collective Construction Land （RCCL） in China. This paper focuses on different methods of RCCL transfer based on stakeholder analysis and three case studies including models from Guangdong, Wuhu and Chongqing. The main finding is that all three models improved resource allocation efficiency and intensive utilization of RCCL through land and capital transfer. Each model built different interest coordination mechanisms among stakeholders, suited to different regions and cases. The Guangdong model is suitable for an economically developed region. The Wuhu model is suitable for developing regions in central China while western underdeveloped regions in China can adopt the Chongqing model. The policy implication is that better policy making for the promotion of RCCL transfer in China should consider regional characteristics as well as the economic development context.展开更多
基金Supported by 973 Program (2007CB310607)National Natural Science Foundation of China (60772062)the Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (N200813)
文摘This paper proposes an approach called PC-CORP (Power Control based Cooperative Opportunistic Routing Protocol) for WSN (Wireless Sensor Networks), providing robustness to the random variations in network connectivity while ensuring better data forwarding efficiency in an energy efficient manner. Based on the realistic radio model, we combine the region-based routing, rendezvous scheme, sleep discipline and cooperative communication together to model data forwarding by cross layer design in WSN. At the same time, a lightweight transmission power control algorithm called PC-AIMD (Power Control Additive Increase Multiplicative Decrease) is introduced to utilize the co- operation of relay nodes to improve the forwarding efficiency performance and increase the robustness of the routing protocol. In the simulation, the performance of PC-COPR is investigated in terms of the adaptation of variations in network connectivity and satisfying the QoS requirements of application.
文摘In this papert the routing problem in virtual circuit networks is considered. We consider the problem of choosing a path for each origin-destination pair to minimize the average delay encountered by packts. We give the usual formulation of this problem as a nonlinear combinatorial optimization problem. We present a genetic algorithm to solve this problem. Extensive computational results across a variety of networks are reported. These results indicate that our method outperforms the other methods in the literature.
文摘In order to establish a unified construction land market, it is necessary to choose a rational pathway for the market transfer of Rural Collective Construction Land （RCCL） in China. This paper focuses on different methods of RCCL transfer based on stakeholder analysis and three case studies including models from Guangdong, Wuhu and Chongqing. The main finding is that all three models improved resource allocation efficiency and intensive utilization of RCCL through land and capital transfer. Each model built different interest coordination mechanisms among stakeholders, suited to different regions and cases. The Guangdong model is suitable for an economically developed region. The Wuhu model is suitable for developing regions in central China while western underdeveloped regions in China can adopt the Chongqing model. The policy implication is that better policy making for the promotion of RCCL transfer in China should consider regional characteristics as well as the economic development context.
