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The ability to continuously detect the interesting subgraph patterns over dynamic graph-structured data in real time is crucial to many applications. Generally, the edges of such subgraphs have temporal relation. In this paper, the stream model is used to describe the dynamic graph, in which the edges are processed in chronological order. In order to reduce the intermediate results, we propose a topological...
In this paper, a novel boost chopper converter-based torque sharing function (TSF) control strategy for switched reluctance motors (SRMs) is proposed to reduce the torque ripple. Thanks to advantages of the simple structure, low cost, high reliability, and wide speed range, SRMs have attracted much attention in the industrial applications. However, the torque ripple is one critical issue to restrict...
In this paper, a new distributed least-squares algorithm is proposed to solve the sensor fusion problem in using wireless sensor networks (WSN) to monitor the behaviors of large-scale multiagent systems. Under the assumption that each sensor can take the measurements of a limited number of agents but the complete multiagent systems are covered under the union of all sensors in the network, the proposed...
In this paper, a novel torque sharing function (TSF)-based direct instantaneous torque control (DITC) strategy is presented to reduce the torque ripple for switched reluctance motors (SRMs) by using a multi-level converter. The corresponding control algorithm is described and analyzed during the different conduction regions in detail. By using the new converter topology, the TSF-based DITC can compensate...
The overlay network has been widely developed in recent years. There may be various overlays that co-exist with each other upon the same underlying network. These overlays have heterogeneous performance goals, and they will compete for the physical resources, so that a sub-optimal performance of the overlays may be achieved. Moreover, the heterogeneity of the overlays makes them difficult to coordinate...
In this paper, we propose a new distributed sensor fusion algorithm for environmental monitoring by wireless sensor networks (WSNs). The considered WSNs are assumed to have limited communication capabilities. For each sensor node, a set of local estimation algorithms are maintained as its fused model for environmental variable to be sensed. The proposed algorithm relies on local information exchange...
In this paper, we propose a distributed cooperative voltage equalization strategy in order to balance the voltages of the series-connected super-capacitors, which is the power supply of energy storage light rail vehicles. Taking each supercapacitor cell as an agent in multi-agent systems, the voltage equalization problem can be formulated as a cooperative tracking problem. The sparse communication...
For 3D point cloud data scanned by a laser scanner, noise has become an obstacle for point cloud reconstruction. Though there are many papers about 3D cloud de-nosing, few are based on the 3D scanner. Now we propose some methods for point noise processing base on 3D scanning data. In this paper we frequently use the way to process the point cloud generated by the scanning machine. We will deal with...
In the study of task coordination for multiagent systems, formation control has received considerable attention due to its potential applications in civil and/or military prac-tices. Fundamentally, formation control problem for multiagent systems can be formulated as making a group of agents follow the desired trajectory while maintaining certain prescribed geometric distances among agents. In this...
In t his paper, we present practical experimental results to demonstrate a control law for consensus of multiagent systems with switching topologies and time delays. The nonlinear control law utilizes nonlinear cooperative control gains and uses contraction mapping to achieve consensus of multiagent systems. The testing platform we used consists of a number of mobile robots. We present the effectiveness...
Topology structure for UAWSN has to be of general characters of WSN not only, but also consider the limited communication range and cell energy, the effect of single damaged cell to the whole network and so on. This paper analyzes the energy efficiency for UAWSN theoretically and then presents the simulation results for square and triangle topology structures with different network scale. All these...
In this paper, we propose a new decentralized control for heavy haul trains by explicitly considering input constraints and time varying communication time delays. Through introducing a set of state and input transformations, the complicated longitudinal dynamical model of the heavy haul train is first converted into the double integrator form for ease of control design. Then, a decentralized cooperative...
Dynamic voltage restorer with minimal energy control strategy can reduce the consumption of active power , but it will bring the phase jump to load . This paper propose an advanced DVR topology structure that by parallelling with a TCR/TSC compensator at load side, it overcome the phase jumpe problem which it bring by traditional minimal energy control. According to the proposed DVR topology structure,...
In this paper, we address the problem of coordinated user scheduling for the downlink of a multi-cell distributed antenna system (DAS). With the practical assumption that only large-scale channel state information (CSI) is known at the transmitter, a low-complexity greedy scheduling scheme is proposed. In order to provide fairness among users, the proposed scheme adopts round-robin scheduling within...
In this paper, we consider distributed dynamic average consensus problem in the presence of uncertainties on information exchange. Two categories of noise are used to characterize these uncertainties: the first is multiplicative noise that captures the randomness of network connections, while the second is additive noise that describes several uncertainty sources. We propose an iterative algorithm...
A new hierarchical genetic algorithm for low-power network on chip (NoC) design is proposed in this paper. As 2D-mesh is a widely used NoC topology, this paper studies the optimization of mapping IP (intellectual property) cores onto regular and irregular 2D-mesh network while minimizing communication power consumption. Experimental results show that significant energy savings can be achieved. For...
In this paper, we consider the problem of designing agents' dynamics such that the multi-agent system can reach consensus in a distributed fashion. Our design approach is independent of the network topology and the agents can be used in mobile networks or fixed networks with different topologies. We review our previous result valid for fixed network topologies and extend it to the case when the interconnection...
In this paper, the downlink performance of distributed antenna systems (DAS) with random antenna layout is investigated. We consider the composite channel including large-scale fading and small-scale fading. When the large-scale channel state information, which usually varies slowly and is easy to be obtained, is available at the transmitter, the problem of power allocation among distributed antennas...
In this paper, the uplink of a multi-user distributed antenna system (DAS) with antenna elements deployed on a circle is investigated. We address the problem of calculating the sum-rate capacity with per-user power constraints. Based on system scale-up, we derive a good approximation of the sum-rate capacity by adopting random matrix theory. We also propose an iterative method to calculate the unknown...
This paper addresses the problem of applying the Lyapunov direct method to stability analysis of cooperative systems. In particular, cooperative stability and its associated Lyapunov function are sought in terms of the topological properties of a cooperative system. Along this direction, the only available result is for the time-invariant case, it requires irreducibility, and the corresponding Lyapunov...
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