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In this paper, average consensus problem of multiagent systems with switching topology and multiple time-varying delays are investigated in undirected networks. Based on Lyapunov stability theory combined with linear matrix inequalities (LMIs) techniques, some novel forms in terms of LMIs are obtained via taking relationship among the terms in the Newton-Leibniz formula into account. Since some free...
In LEO satellite communication system, the high speed movement of satellite makes the AER (Azimuth, Elevation, Range) characters of inter-orbit adjacent satellite changing deeply. So, the topology optimization of LEO satellite becomes a big challenge to OBP (On-Board Processing) satellite system. In this paper, the Polar global coverage satellite constellation is studied. The inter-orbit and intra-orbit...
In this paper, we propose and analyze an analytical propagation model of a vulnerability mitigation worm (Seawave). The model takes into consideration the topology structure of enterprise networks such as switches, LANs, and backbone, proposing the first computer worm that use layer two of the OSI model as its main propagation medium. The model also addresses the worm's communication delays due to...
RCP algorithm is a rate-based explicit congestion control, it performs well on the efficiency convergence and fairness convergence and has a good performance under the multiple-bottleneck network topology environment. But some researches show that, when a new flow join in the network RCP algorithm exists severe instantaneous over loading, this phenomenon results in the packet loss. We added source...
Most reactive routing protocols hoc wireless networks rely on a broadcast algorithm known as flooding for route discovery. With flooding, many copies of each message are retransmitted unnecessarily resulting in a sub-optimal resource consumption. Given that mobile devices usually have limited power and computational resources, it is of the utmost importance to reduce the resource consumption of each...
Clustering of nodes provides an efficient way of handling topology maintenance, managing node movement or reducing overhead in mobile ad hoc networks. In first reference paper, a fast clustering broadcast algorithm based on delay broadcast was presented and it can greatly decrease the cluster establishment time along with the network scale's extension. In this paper, an improved algorithm was presented...
It is an established fact that the network topology can have an impact on the performance of scientific parallel applications. However, little work has been done to design an easy to use solution inside a communication library supporting a parallel programming model where the complexities of making the application performance network topology agnostic is hidden from the end user. Similarly, the rapid...
One of the consequential new features of emerging datacenter networks is lossless ness, achieved by means of Priority Flow Control (PFC). Despite PFC's key role in the datacenter and its increasing availability -- supported by virtually all Converged Enhanced Ethernet (CEE) products -- its impact remains largely unknown. This has motivated us to evaluate the sensitivity of three widespread TCP versions...
The need for reliable and quick communication in the power grid is growing and becoming very critical. With the Smart Grid initiative, an increasing number of intelligent devices, such as smart meters and new sensors, are being added to the grid. As these new devices are added, the traffic demand on the communication network increases. This can cause issues like longer delay, dropped packets, and...
The paper proposes a resource efficient solution for Network Coding (NC) based congestion control consisting in identification around the congested links of multiple butterfly topologies by using the Discrete Lagrange Multiplier optimization algorithm. The instantiation of the butterfly topologies is based on the resource management capabilities foreseen for the entities of the future networks. The...
Virtual position-based routing protocols have many attractive characteristics for wireless sensor networks. Typically, such protocols use a proactive scheme for updating routing tables. Because sensor networks can have very low data rate, sending periodic beacons to update routing tables can be very expensive. Instead, reactive approaches might be more appropriate in such scenarios. MANET-inspired...
Major Challenge for deploying Ethernet in metro area networks is to guarantee the quality of service and traffic engineering requirements. In the literature, there are many forwarding strategies proposed by researchers to overcome this challenge. One significant difficulty in assessing and comparing the different forwarding strategies proposed is the lack of a standard test environment or benchmark...
This paper studies consensus problem of discrete-time networked multi-agent systems (NMASs) with directed networks and a communication delay. A novel consensus protocol based on the networked predictive control schemes is proposed to compensate for communication delay actively. For the NMAS with fixed directed topology and a constant delay, necessary and sufficient conditions of achieving consensus...
The paper presents work-in-progress on the cloud service provisioning across multiple cloud providers. The work assumes the emergence of Cloud Brokers between customers and cloud providers. The brokers split user requests and ensure provisioning from multiple providers. An exact splitting algorithm is developed to efficiently split the cloud requests among the multiple cloud platforms with the aim...
Multiple autonomous underwater vehicles (AUVs), communicating with each others in an opportunist way and through an arbitrary topology, create an ad-hoc underwater sensor network. Due to the mission in which AUVs might be employed or simply due to the drift typical of underwater scenarios, each node might be subject to movements from its initial position, leading to a variation on the network topology...
This article presents the design of RecoNoC: a compact, highly flexible FPGA-based network-on-chip (NoC), that can be easily adapted for various experiments. In this work, we enhanced this NoC with dynamically reconfigurable shortcuts. These can be used to alter the NoC's topology to adapt to the system's communication needs. The design has been implemented and tested on a Xilinx Virtex-2 Pro FPGA,...
This paper investigates the analytical methods of the consensus problem for multi-agent systems by the Robust H∞ control theory. The system model, the control protocol and the desired H∞ performance are analyzed for multi-agent systems with external disturbance, uncertainty and time-delay. The results obtained by different analysis methods regarding the consensus of multi-agent systems by robust H...
A 3-dimension topology generation approach based Spidergon is proposed. The approach determines the structure of topology by the relationship between delay model and number of layers, which based on the prototype topology. Furthermore, a adaptive routing algorithm is proposed. This routing algorithm routed packets in vertical direction firstly, and improve the throughput by finding the equivalent...
The availability of novel communication services to telecom subscribers is creating a huge traffic growth over the underlying optical infrastructure. The expected high development costs of first generation 100 Gb/s equipment drives service providers to find alternative solutions for upgrading network capacity. Optical transport network (OTN) systems can use mature 10 Gb/s and 40 Gb/s equipment along...
Evolutionary Algorithms (EAs) have been used to develop methods for Traffic Engineering (TE) over IP-based networks in the last few years, being used to reach the best set of link weights in the configuration of intra-domain routing protocols, such as OSPF. In this work, the multiobjective nature of a class of optimization problems provided by TE with Quality of Service constraints is identified....
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