The traditional Practical Byzantine Fault Tolerance(PBFT)approach suffers from three critical deficiencies:arbitrary primary node election,excessive network transmission overhead,coupled with the absence of node incen...The traditional Practical Byzantine Fault Tolerance(PBFT)approach suffers from three critical deficiencies:arbitrary primary node election,excessive network transmission overhead,coupled with the absence of node incentive mechanisms.To address these issues,this study proposes a refined PBFT strategy utilizing dual scoring(Double Scoring Practical Byzantine Fault Tolerance,DS-PBFT).The algorithm innovatively combines hardware performance evaluation with a dual-dimensional node scoring system.The algorithm first employs bucket sorting technology to quantitatively evaluate node hardware resources,followed by constructing a comprehensive scoring model through credit values and recommendation values.According to the scoring outcomes,the framework hierarchically divides nodes into primary node,follower node and backup nodes groups in a 1:4:5 ratio,substantially decreasing the quantity of nodes involved in consensus.Additionally,this approach streamlines the Commit-Reply stages within the consistency protocol,substantially reducing communication overhead.Experimental validation demonstrates that DS-PBFT maintains security while achieving notable improvements in consensus efficiency,significant reductions in communication costs,and enhanced defense capabilities against malicious nodes.展开更多
Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking ...Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.展开更多
This paper, taking the distance between the piezoelectric ceramic center and the displacement node location of the transducer as a parameter, investigates the relation of characteristic parameters of transducer, such ...This paper, taking the distance between the piezoelectric ceramic center and the displacement node location of the transducer as a parameter, investigates the relation of characteristic parameters of transducer, such as force factor, equivalent resistance, potential maximum electroacoustical efficiency, and loading performance, to the displacement node location. Some design considerations about the selection of node location are noted .展开更多
文摘The traditional Practical Byzantine Fault Tolerance(PBFT)approach suffers from three critical deficiencies:arbitrary primary node election,excessive network transmission overhead,coupled with the absence of node incentive mechanisms.To address these issues,this study proposes a refined PBFT strategy utilizing dual scoring(Double Scoring Practical Byzantine Fault Tolerance,DS-PBFT).The algorithm innovatively combines hardware performance evaluation with a dual-dimensional node scoring system.The algorithm first employs bucket sorting technology to quantitatively evaluate node hardware resources,followed by constructing a comprehensive scoring model through credit values and recommendation values.According to the scoring outcomes,the framework hierarchically divides nodes into primary node,follower node and backup nodes groups in a 1:4:5 ratio,substantially decreasing the quantity of nodes involved in consensus.Additionally,this approach streamlines the Commit-Reply stages within the consistency protocol,substantially reducing communication overhead.Experimental validation demonstrates that DS-PBFT maintains security while achieving notable improvements in consensus efficiency,significant reductions in communication costs,and enhanced defense capabilities against malicious nodes.
基金supported in part by the 973 Program under Grant No.2013CB329100in part by NSFC under Grant No.61422101,62171200,and 62132017+1 种基金in part by the Ph.D. Programs Foundation of MOE of China under Grant No.20130009110014in part by the Fundamental Research Funds for the Central Universities under Grant No.2016JBZ002
文摘Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.
文摘This paper, taking the distance between the piezoelectric ceramic center and the displacement node location of the transducer as a parameter, investigates the relation of characteristic parameters of transducer, such as force factor, equivalent resistance, potential maximum electroacoustical efficiency, and loading performance, to the displacement node location. Some design considerations about the selection of node location are noted .
