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Existing port hopping technologies are hard to be implemented, as they have much interaction with communication nodes in hopping process. In addition, it is also difficult to achieve strict time synchronization and the synchronization packets of ACK synchronization method are easy to be intercepted. To solve those above problems, a transparent synchronization based port mutation scheme in SDN network...
In order to resist DoS attack, taking advantages of SDN network's logically centralized control and network programmable features, a port hopping based DoS mitigation scheme in SDN network is proposed, which moves port hopping function forward to SDN controller and presents a timestamp feedback based hopping synchronization method. This proposed scheme not only can reduce protected server's cost caused...
In an OFDM-based cooperative relay system, the arrival times and carrier frequency offsets (CFOs) of the signals from different relays are most likely different. Estimation of these timing offsets and CFOs is a crucial and challenging task. In this paper, a new preamble structure is designed, and an efficient time and frequency offset estimator is proposed for the OFDM-based cooperative system. The...
Digital Video Broadcasting - Second Generation Terrestrial (DVB-T2) is a new standard used for the digital terrestrial television broadcast. Compared with the first generation DVB-T, it introduced various advanced technologies to improve system capacity and transmission reliability. One of the new designs in DVB-T2 is to use P1 symbol as the preamble to help the receiver to achieve fast synchronization...
We consider synchronization of coupled semiconductor lasers modeled by coupled Lang and Kobayashi equations. We first analyze decoupled laser stability, and then characterize synchronization conditions of coupled laser dynamics. We rigorously prove that the coupled system locally synchronizes to a limit cycle under the coupling topology of an undirected connected graph with equal in-degrees. Graph...
We consider the problem of controlling coupled identical, planar particles in the polar coordinate to achieve various collective motions. We first introduce a model that allows amplitude and phase coordination by decomposing particles' positions into the amplitude and phase states. Then we present two control algorithms based on this model. The convergence analysis shows that under different coordination...
In this paper, we study the synchronization problem of networked uncertain Lagrangian systems on directed communication topologies. For the nominal model, we propose a backstepping-based synchronization design for heterogenous Lagrangian systems on digraphs with a spanning tree. We relax the feedback gain constraints on the distributed synchronization control law which encompasses the existing double...
This paper introduces SLAW, a Scalable Locality-aware Adaptive Work-stealing scheduler. The SLAW scheduler is designed to address two common limitations in current work-stealing schedulers: use of a fixed task scheduling policy and locality-obliviousness due to randomized stealing. Past work has demonstrated the pros and cons of using fixed scheduling policies, such as work-first and help-first, in...
We study the multi-robot synchronization on a segment. The goal is for each robot to move along a subsegment of equal length in equal time interval with potential impacts. To achieve the synchronization, we propose a decentralized algorithm by designing impact law, which does not depend on the position of the robot, but on the time information. Specifically, ??the time interval between two consecutive...
Multiple programming models are emerging to address an increased need for dynamic task parallelism in applications for multicore processors and shared-address-space parallel computing. Examples include OpenMP 3.0, Java Concurrency Utilities, Microsoft Task Parallel Library, Intel Thread Building Blocks, Cilk, X10, Chapel, and Fortress. Scheduling algorithms based on work stealing, as embodied in Cilk's...
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