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A three-phase three-port rectifier (TPTPR), which is capable of handling an AC port, a low voltage DC port and a high voltage DC port simultaneously, is presented in this paper. To directly transfer power from the AC port to the low voltage DC port within single-stage power conversion, a modified SVPWM strategy based on asymmetric three-level vector space is analyzed and evaluated in this paper. With...
This paper presents an application of the formal method to model and verifies the communication and control for a fleet of collaborative autonomous underwater vehicles (AUV) named as Eco-Dolphin. The fleet includes YellowDolphin, BlueDolphin, and RedDolphin, which are designed to collect environmental data and provide surveillance services in littoral water. The system architecture of the fleet is...
The solar ship, that is, a ship utilizing a solar photovoltaic system as the auxiliary power system, is an important green-ship technology for the shipbuilding industry. In the conventional sense, the optimum route is defined as the voyage route that ensures the safety, comfort, and low energy consumption. And for the solar ship, increasing the received solar radiation level of the PV system is helpful...
In this paper, a neurodynamic optimization approach is proposed for robust pole assignment of fractional-order control systems. Compared with integral-order systems, the pole assignment of fractional-order systems is more challenging due to variability of stability region. The robust pole assignment is formulated as a constrained optimization problem, and a robustness measure is derived as a pseudoconvex...
In this paper, we study upper bounds on the sum capacity of the downlink multicell processing model with finite backhaul capacity for the simple case of 2 base stations and 2 mobile users. It is modeled as a two-user multiple access diamond channel. It consists of a first hop from the central processor to the base stations via orthogonal links of finite capacity, and the second hop from the base stations...
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 we address a sum secrecy rate maximization problem for a multi-carrier and MIMO communication system. We consider the case that the receiver is capable of full-duplex (FD) operation and simultaneously sends jamming signal to a potential eavesdropper. In particular, we simultaneously take advantage of the spatial and frequency diversity in the system in order to obtain a higher level...
In this brief, we present a formation control algorithm for multiagent systems in realistic communication environments. The proposed design is motivated by the flocking algorithm in [5] with the utilization of a new communication outage probability-dependent collective potential function in the derivation of the formation control algorithm. Upon convergence, it can be shown that all agents achieve...
In recent years, because of the interconnection of large grids and the accession of HVDC, real-time analysis approach is needed for transient voltage security (TVS) analysis. Traditional simulation analysis is time-consuming and the transient energy function approach is difficult to analyze large scale power systems. In this paper, an approach for real-time TVS analysis is proposed based on off-line...
In this work we study the behavior of a full-duplex (FD) and amplify-and-forward (AF) relay with multiple antennas, where hardware impairments of the FD transceivers are taken into account. Due to the inter-dependency of the transmit relay power on each antenna and the residual self-interference intensity in an AF-FD relay, we observe a distortion loop which degrades the system performance. An optimization...
In this paper, we propose a distributed detection algorithm for collective behaviors in multiagent systems. The multiagent systems may exhibit various collective behaviors, such as flocking, torus, swarm, under different agents interaction models and control parameters. To detect those collective behaviors, we design a local and distributed algorithm to estimate certain global characteristic signals...
This concept paper presents the preliminary work on the application of formal method to verify the correctness of software-hardware co-design. A model checking tool called UPPAAL is used to check the fault-tolerance of the system design. The paper briefly describes the hardware platform, a fleet of collaborative AUVs (autonomous underwater vehicles) named Eco-Dolphin, and its software architecture...
Hardware Trojans are a critical security threat to integrated circuits. We propose an optical method to detect and localize Trojans inserted during the chip fabrication stage. We engineer the fill cells in a standard cell library to be highly reflective at near-IR wavelengths so that they can be readily observed in an optical image taken through the backside of the chip. The pattern produced by their...
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...
In this paper, we propose a discontinuous cooperative control for consensus of multiagent systems with directed and switching sensing/communication topologies and time-delays. By introducing a new design for nonlinear cooperative control gains, multiagent system consensus can be guaranteed in the presence of switching topologies and time-delays. System convergence analysis is done by employing a new...
We propose a multi-person tracking framework using only one single camera in this paper. We utilize particle filter as the tracking framework and train a SVM classifier by reliable examples extracted from associated detections without occlusion. Based on the results of data association, we integrate the target's velocity into weights calculation to handle object occlusion assuming that fast-moving...
This paper introduces a novel tracking framework for robots that can adapt various appearance changes of object and also owns the ability of reacquisition after drift. Two classifiers, LaRank and Online Random Ferns, are adopted to realize this tracking algorithm. The former one maintains the adaptive tracking using a Condensation-based method with an online support vector machine (SVM) as observation...
This paper proposed a new stereo matching method with a combination of cross-based support aggregation based on the assumption that neighboring pixels with similar colors should have the same disparities and an efficient belief propagation optimization algorithm. With the merits of both local method and global method, we first propose a novel matching cost function incorporating the edge information...
This paper demonstrates the use of a Nipkow disk confocal microscope for improved contrast and resolution of CCD TR thermography. The performance of wide field and confocal thermography is compared, with experimental results showing that confocal CCD TR offers more than a 2-fold improvement in image contrast due to suppression of out-of-focus light, for improved lateral discrimination of thermoreflectance...
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