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This paper studies the consensus problem for discrete-time multi-agent systems with state, input and different communication delays, where the input delays can be arbitrarily large yet exactly known. Moreover, the communication delays are different for different agents and can also be arbitrarily large. A nested predictor based protocol is established to solve the problem. It is shown that both the...
Swarming movement of dynamical multi-agent systems with modeling errors is studied. Supposing multi-agent systems have multiple leader agents and their topology is dynamically changed with jointly-connected, swarming algorithm of multi-agent systems with model uncertain parameters is proposed. The moving stability of multi-agent systems with time-varying delays is investigated by applying Matrix theory...
This paper investigates formation problem of multiple thrust-propelled vehicles (TPVs) under switching interaction topologies and communication delays. In the presence of time-varying disturbances, we introduce a controller guaranteeing that all vehicles in a team construct a pre-specified formation from any initial states. To tackle the translational and rotational disturbances, we take advantage...
The consensus algorithm is proposed to solve the bounded consensus tracking problems of leader-following multi-agent systems under directed networks, where the control input of an agent can only use the information measured at the sampling instants from its neighbors or the virtual leader. Based on the delay decomposition approach, the augmented matrix method and the frequency domain analysis, the...
This paper presents a distributed model predictive algorithm for a multi-agent system with communication delays between agents. AII the agents are dynamically decoupled, which is driven by a local controller relying on the information of its neighbors and itself. We introduce the waiting mechanism to deal with communication delays, and utilize the distributed model predictive control approach to derive...
In this paper, we investigate the effect of scale-free structure of a network topology on performance of CCN (Content-Centric Networking). Specifically, we generate multiple scale-free and non-scale-free network topologies by two synthetic network generation models (i.e., scale-free tree and generalized BA model). We compare the average delivery delay and throughput of CCN with scale-free and non-scale-free...
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...
The synchronized trajectory tracking control problem of multiple mobile robots under actuator faults is studied in this paper. We take the communication delays into consideration in system design and do not require that the network topology is symmetric. A distributed control design approach is proposed by incorporating the synchronized formation control method and a sufficient condition is obtained...
In this paper, we propose efficient scalable nonvolatile flip-flops (NV-FF) with single-stage pulsed latch which is explored as the flip-flop core in hybrid CMOS/MTJ (magnetic tunnel junction) integration. Typical full-custom FF cores are implemented with a 28nm ultra-thin body and buried oxide (UTBB) fully depleted silicon-on-insulator (FD-SOI) technology. The performance analysis takes into account...
Heterogeneous integration of disparate device planes is a benefit of through-silicon-via based 3-D integrated circuits (ICs). Clock delivery for heterogeneous 3-D ICs requires novel circuit techniques and algorithms as compared to 2-D and even homogeneous 3-D ICs. Novel algorithms for topology generation (heterogeneous 3-D balanced bipartitioning) and for embedding of a clock tree in a heterogeneous...
The present work proposes a capacitor charge /discharge based oscillator topology. The circuit is designed for a supply voltage range between 1.6V and 2V, using submicron CMOS technologies. The new oscillator topology brings noticeable improvements from the stand point of the supply voltage influence, power consumption and total implementation area.
Software-defined networking (SDN) has separated control and forwarding planes, which is a powerful approach to enable network virtualization by SDN hypervisors to share physical SDN networks among multiple virtual SDN in cloud data center. However, the centralized control and virtual network shared physical network are delicately weak and easy to failure if virtual topology embedding is not properly...
The addition is the most used arithmetic operation in Digital Signal Processing (DSP) algorithms, such as filters, transforms and predictions. These algorithms are increasingly present in audio and video processing of battery-powered mobile devices having, therefore, energy constraints. In the context of addition operation, the efficient 4-2 adder compressor is capable to performs four additions simultaneously...
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.
This paper presents a measurement study of congestion on a production, highly utilized, 72K-core InfiniBand cluster called Yellowstone. The measurement study consists of a 23-day data collection phase in which port counters of the Yellowstone switches were read multiple times every hour to check for stalls during which the port is unable to send data due to a lack of flow-control credits. A total...
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 deployment of novel network concepts, such as M2M communication or IoT, has undoubtedly stimulated the placement of a new set of services, leveraging both centralized resources in Cloud Data Centers and distributed resources shared by devices at the edge of the network. Moreover, Fog Computing has been recently proposed having as one of its main assets the reduction of service response...
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...
To speed up the recovery from network failures, an extensive list of methods have been proposed. Many failure-recovery methods are proposed based on tunneling or marking, which increase the packet processing burden on routers and consume extra bandwidth. With neither tunneling nor marking, existing methods guarantee recovery from any single-link failure if a detour for the failed link exists, but...
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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