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Since its inception, FlowVisor has been used in research environments across university campuses and ISPs, as part of network testbeds like GENI and OFELIA. The fundamental principles employed by FlowVisor have been used in its extensions like DFVisor and VeRTIGO. As FlowVisor was the precursor to several network virtualization platforms, a close look into the FlowVisor architecture, internals and...
Scaled consensus seeking is investigated for a heterogeneous linear first-order multi-agent system, and a leader-following consensus algorithm is designed. By using frequency-domain analysis, consensus conditions are obtained for the agents without communication delay under symmetric and asymmetric topology respectively. Moreover, consensus criteria are also gained for the agents with communication...
Internet of Things becomes one of the main trends in development of future networks. It introduces new challenges to network operator, like exponential growth of the traffic, large amount of network nodes to manage or variety of services. Some IoT services include the control of critical processes such as remote manipulation of a robotic arm in tele-surgery. In such processes, keeping very low end-to-end...
Stangenes Industries has developed a solid-state inductor-driven kicker magnet pulse generator for use in a particle accelerator application. The system operates in a neutron environment which precludes the use of standard capacitor-driven systems. A 500–700 A pulse is produced by switching high-current through a large 360 μH inductor from the circuit return into a 6.5 μH kicker magnet. The DC magnetic...
Flooding Peer-to-Peer (P2P) networks form the basis of services such as the electronic currency system Bitcoin. The decentralized architecture enables robustness against failure. However, knowledge of the network's topology can allow adversaries to attack specific peers in order to, e.g., isolate certain peers or even partition the network. Knowledge of the topology might be gained by observing the...
The objective of this paper is to develop a novel consensus control algorithm for multi-agent systems (MAS) experiencing constant and time-varying communication delays along with random packet data loss. The topology of the communication network of the system is modeled by an algebraic graph theory. The multi-agent dynamics is based on double integrator systems in discrete time domain. Bernoulli distribution...
Usual consensus algorithm is adopted to solve the consensus problem of general linear first-order multi-agent systems subjected to communication delay. In addition to normal synchronously-coupled form and asynchronously-coupled form, we proposed a new compensation-based form for the consensus algorithm. With the help of frequency-domain analysis, consensus conditions are obtained for the agents to...
This paper concerns optical burst switching (OBS) networks with combined nodes which function as both edge and core nodes. In such architecture, we propose intermediate electronic buffering of transit burst traffic. As our simulations show, this buffering, when applied in a restricted manner, decreases the overall burst blocking probability in the network and provides better fairness among short and...
Routing in NDN networks must scale in terms of forwarding table size and routing protocol overhead. Hyperbolic routing (HR) presents a potential solution to address the routing scalability problem, because it does not use traditional forwarding tables or exchange routing updates upon changes in network topologies. Although HR has the drawbacks of producing sub-optimal routes or local minima for some...
Scaled group consensus problem of second-order multi-agent systems is investigated in this paper, and the dynamical and stationary consensus protocols are proposed respectively. Firstly, scaled group consensus is analyzed for the second-order multi-agent systems with directed interconnection topology. Subjected to time-varying communication delay, then, the dynamical and stationary consensus protocols...
There is a huge number of SDN experimental platforms available such as simulators, emulators and actual testbeds, each of them having different performance metrics. This paper presents a series of performance tests, that can be performed in each of the available platforms, in order to evaluate and rank them in various performance categories. These tests cover performance categories such as experiment...
Congestion links can not only introduce great packet losses, but also cause significant delay flutters to paths that traverse them. However, most of current approaches just try to identify congestion links that meet end-to-end loss observations. What's worse, most of them also take no consideration of multipath routing, while which will introduce more than a single routing path between two end-hosts...
Computation of service function chains in multi-domain networks is critical for enabling the wide deployment of network function visualization for providing end-to-end network services. In this paper, we present a vertex-centric distributed orchestration framework for multi-domain networks, in which physical infrastructure information is maintained locally within each domain without infrastructure...
Differential driven unmanned ground vehicles (UGVs) and quadrotor unmanned aerial vehicles (UAVs) are linearized as first-order integrators and fourth-order integrators respectively in this paper. Consensus problem is investigated for a heterogeneous multi-agent system composed of first-order and fourth-order agents. Firstly, consensus convergence for heterogeneous multi-agent systems is studied with...
Named Data Networking (NDN) is an Information-Centric Networking architecture that has recently attracted significant attention. NDN rethinks the Internet communication paradigm around the name of the data instead of its location. In Content-Oriented architectures, in-network caching enables data retrieval from different network nodes and may result in frequent data sources changes and wide RTT fluctuations...
The decoupling of control and data plane in software-defined networking (SDN) has been shown to be promising to improve routing performance in the context of intradomain routing. The applicability of SDN in inter-domain routing, especially with respect to route convergence, has not been properly explored. In this work, we propose a mathematical model to quantify the BGP convergence time for inter-domain...
The recent technological advances related to computing, storage, cloud, networking and the unstoppable deployment of end-user devices, are all coining the so-called Internet of Things (IoT). IoT embraces a wide set of heterogeneous services in highly impacting societal sectors, such as Healthcare, Smart Transportation or Media delivery, all of them posing a diverse set of requirements, including real...
Wireless radio-frequency (RF) technologies has had universal wide-scale deployment. Despite this, the practical limitations of the RF spectrum being unable to meet the challenges (e.g. lack of security, high interference, limited bandwidth, scalability) of RF based communication networks have become increasingly apparent over the past decade. With the ever-growing of data heavy wireless communications,...
A high speed low power modified latch type static sense amplifier design for current sensing in non-volatile memories is presented in this paper. The idea presented in this paper makes use of the fact that the scaling in technology introduces severe reliability issues in sensing circuits, due to device mismatches, which cause unpredictability in their performance metrics. In this paper, a detailed...
This paper presents an improved technique for the calibration of the relaxation oscillators with respect to the delay of the comparators. The drawbacks of the conventional topology for the relaxation oscillators are analyzed. Based on the analysis, the circuit modification which resolves the effects of the comparator delay in the trimming procedure is proposed. The simulations in ams 0.18μ CMOS technology...
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