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The bipartite consensus problem of descriptor multi-agent systems with continuous-time linear dynamics and Lipschitiz nonlinearity is considered in this paper. The interaction topology is assumed an undirect signed graph. Based on the general Riccati equation, a distribute adaptive protocol is presented to solve the bipartite consensus problem. Some sufficient consensus conditions are established...
This paper studies output-feedback time-varying formation (TVF) protocol design problems for general linear swarm systems with directed interaction topology. By adding extra observers, an adaptive output-feedback TVF protocol is constructed for general linear swarm systems with directed interaction topology to achieve a given TVF. Then, a fully distributed algorithm is proposed based on only local...
This paper considers the target surrounding control problem of second-order multi-agent systems with linear dynamics and switching topologies. In our scheme, all agents finally converge to a circle around the target and then move along it. Firstly, a distributed protocol is given for each agent to estimate the position of static target. It is shown that the estimation of each agent eventually converges...
This paper focuses on studying the group consensus tracking issue of discrete time second-order multi-agent systems (MASs) under directed fixed and Markovian switching topologies, respectively. For MASs with m leaders, we first introduce a method to divide the whole MASs into m subgroups. Based on the subgroup-divided method, the condensation directed graph G of the communication topology of the whole...
This paper investigates causal consensus problem of a class of singular (descriptor) multi-agent systems with network delays, fixed topology. For the studied systems, different from traditional open-loop prediction approach, a pseudo predictor based on closed-loop artificial system is proposed to predict the future state. For the time-varying delay, a data-receiving policy is proposed to turn it into...
Information-Centric Networking (ICN) has emerged as an interesting approach to overcome many of the limitations of legacy IP-based networks. However, the drastic changes to legacy infrastructure required to realise an ICN have significantly hindered its adoption by network operators. As a result, alternative deployment strategies are investigated, with Software-Defined Networking (SDN) arising as...
Wireless communication presents the most attractive sign of development in this decades. It contributes to the appearance of Wireless Sensor Network (WSN) which is invented in order to increase the supervision capacity for such phenomenon. It gets more regard from both the customers and the research society. (WSNs) is composed from numerous wireless sensor nodes which suffer from a very serious energy...
Network operators must deal with multi-layer architectures in their production networks. Not so much time ago, network operators were delivering the IP traffic using ATM. ATM protocol was used to aggregate end-user traffic coming from DSL connections. This traffic was transported Synchronous Digital Hierarchy (SDH) as the standard transport technology for fiber-optic transmission systems in backbone...
Sleep mechanism(SM) is often used to design green network, however, sleep mechanism must take data loss, network performance and other situations into consideration. Due to hierarchical and centralized control, SDN makes it simple to deploy new applications. SDN is becoming more and more popular in new network applications. In this paper, a new implementation of SM based on SDN is proposed, the SM...
The goal of this paper is two-fold. First, to expand an opportunistic network coding protocol for wireless networks, called PlayNCool, in order to incorporate new mechanisms to improve performance in the presence of packet losses. In particular, exploiting additional helper nodes to improve the quality of each link and even across neighbouring links and using simulations to show that an additional...
In this paper we propose a novel consensus-based control strategy, for platoons of autonomous vehicles, able to counteract to message falsification attacks. The control approach has been validated by using the PLEXE simulator. The presented comprehensive analysis confirms the effectiveness of the proposed solution.
OpenFlow Discovery Protocol (OFDP) is the defacto protocol used by OpenFlow controllers to discover the underlying topology. In this paper, we show that OFDP has some serious security, efficiency and functionality limitations that make it non suitable for production deployments. Instead, we briefly introduce sOFTD, a new discovery protocol with a built-in security characteristics and which is more...
In modern data centers, many flow-based and task-based schemes have been proposed to speed up the data transmission in order to provide fast, reliable services for millions of users. However, existing flow-based schemes treat all flows in isolation, contributing less to or even hurting user experience due to the stalled flows. Other prevalent task-based approaches, such as centralized and decentralized...
The recent networking paradigm shifts towards the virtualization and softwarization of network functions, controls, and applications that are promising; they optimize costs and processes while bringing new value to the infrastructures. However, the centralized reliability management in softwarization architecture poses both scalability and latency challenges. In this paper, we design and build a novel...
To address demanding requirements in terms of expected throughput, latency and scalability, 5G networks will offer high capacity to support huge volumes of traffic generated by heterogeneous services. Dense deployment of small cells can provide a valid solution but are prone to high levels of interference especially at the cell-edge. However, to reduce inter-cell interference and improve cell-edge...
This paper describes a trusted lightweight synchronisation protocol for wireless ad-hoc networks. The wireless ad-hoc network and wireless sensor networks is a large field of research. Their dynamic topologies make them difficult to synchronise (power consumption, slow convergence, accuracy). Moreover, these open networks are vulnerable to faulty nodes and attacks from malicious nodes. In this paper...
Broadcast is a fundamental operation in Mobile Ad-Hoc Networks (MANETs). A large variety of broadcast algorithms have been proposed. They differ in the way message forwarding between nodes is controlled, and in the level of information about the topology that this control requires. Deployment scenarios for MANETs vary widely, in particular in terms of nodes density and mobility. The choice of an algorithm...
We consider systems made of autonomous mobile robots evolving in highly dynamic discrete environment i.e., graphs where edges may appear and disappear unpredictably without any recurrence, stability, nor periodicity assumption. Robots are uniform (they execute the same algorithm), they are anonymous (they are devoid of any observable ID), they have no means allowing them to communicate together, they...
This paper deals with the design of a consensus algorithm for a multi-aircraft (type Quadrotor) leader-follower system. This algorithm uses directed communication topologies, as well as input saturation for the follower agents. The convergence analysis of the proposed strategies is analyzed by using Lyapunov stability theory. Semi-global asymptotic consensus tracking is obtained for the case of leader...
Groups of strongly consistent devices can efficiently order events under ideal (data center) conditions, but become less effective in dynamic and heterogeneous environments. Weakly consistent devices efficiently tolerate both faults and dynamic conditions but are slow to converge on a single ordering of system events. We propose "federated consistency", which combines the strengths of both...
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