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In a complex heterogeneous wireless sensor networks (HWSN), the individual sensor node is equipped with extremely different battery capacity and computational capability. Node failure is an inevitable phenomenon which leads to decreasing the lifetime and Qos of the networks. Topology control is an energy-efficient technique to prolong the network lifetime and maintain the network Qos. In this paper,...
Finite-time consensus problem of multi-agent systems over switching jointly connected topologies is studied in this paper. Based on the graph theory, homogeneous property and LaSalle's invariance principle(LIP), some sufficient conditions are derived for the given consensus protocols even though the communication links between the agents dynamically change over time and the corresponding networks...
In this paper, distributed time-varying formation control problems for general high-order linear time-invariant multi-agent systems with directed interaction topologies are addressed using an adaptive based approach. Firstly, a distributed adaptive time-varying formation control protocol is proposed, which assigns a time-varying coupling weight for each node in the interaction topology. Then an algorithm...
Distributed time-varying formation control problems are considered for general high-order linear time-invariant multi-agent systems using an adaptive based approach with undirected interaction topology. Based on relative neighboring state information, by distributing each node a time-varying coupling weight, a distributed adaptive control protocol is proposed for achieving time-varying formation....
Formation control problems for second-order swarm systems with general directed topologies are addressed in this paper, where the desired formation can be time-varying and the directed topology can be switching. Firstly, a distributed time-varying formation control protocol using local neighboring state information is proposed. Then an algorithm to design the protocol with switching directed topologies...
This paper presents transistor-level design of a 150 MHz bandwidth continuous-time (CT) ΔΣ modulator in a 0.85 V 28 nm CMOS process. Architectural-level design tradeoff for the high bandwidth requirement is discussed. A stand-alone DAC calibration scheme that suits the high-speed modulator is proposed for linearization. Simulation results show that the modulator achieves signal-to-noise-and-distortion...
The routing algorithms of DTN (Delay- and Disruption-Tolerant Networks) have not been efficient enough until now, which is one of the hot spots for DTN research. In this paper, aiming at fully using the knowledge inside the DTN environments both locally and globally, we propose a forecast method based on time-varying graph using time series analysis theory. By processing the history contact data with...
This paper presents transistor-level design of a continuous-time (CT) reconfigurable ΔΣ modulator in a 1.2 V 65 nm CMOS process. Both architectural- and circuit-level power-optimization techniques, such as flexible loop order and quantizer bit, switchable OTA unit cells, and folding flash ADC, are utilized to achieve power efficiency over all bandwidths. As gate leakage current in 65 nm technology...
We investigate a computationally-efficient multipath routing scheme for survivable provisioning in Mixed-Line-Rate networks. Our approach exploits heterogeneity of multiple rates and guarantees that a specified fraction of the requested bandwidth survives any single-link failure.
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