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The power curve of a wind turbine plays a significant role in design, operation, control and monitoring of wind turbines. Especially, it provides necessary information for wind farm maintenance decisions, allowing for not only comparison among the same type of wind turbines installed in different place but also the same one at different time stamps. In this study, a standardized wind turbine power...
Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
This paper will present a series of novel polarization reconfigurable antennas for modern wireless applications. First, three multi-linear polarization reconfigurable antennas with the switchable 0°, +45°, 90° and −45° polarizations are investigated for mitigating the polarization mismatching problem in wireless biomedical applications. Three distinctive techniques were adopted to realize the same...
In public channels, common signals need to be transmitted omnidirectionally to achieve cell-wide coverage. In this paper, we consider omnidirectional beamforming for common signal transmission in the massive multi-input multi-output (MIMO) scenario. After formulating the task as a max-min optimization problem, we propose a semidefinite programming (SDP) based technique to maximize the minimum received...
Chirp slope keying (CSK) modulation based on linear frequency modulation signal (LFM) and hyperbolic frequency modulation signal (HFM) combined with passive time reversal (PTR) for mobile underwater acoustic communication is proposed in this paper. For CSK modulation, the carriers are LFM and HFM signals, and the bit information is represented by different signals. A PTR processor is designed at the...
Third-party libraries (3PLs) are widely introduced into Android apps and they typically request permissions for their own functionalities. Current Android systems manage permissions in process (app) granularity. Hence, the host app and the 3PLs share the same permission set. 3PL-apps may therefore introduce security risks. Separating the permission sets of the 3PLs and those of the host app are critical...
A detailed conducted EMI prediction model of the three-stage starter/generator is proposed in this paper to analyze the EMI during the starting procedure. The main generator and exciter high-frequency (HF) models are represented by multistage LRC networks. The traditional low-frequency (LF) models in d-q reference and the corresponding control strategies are combined with the HF models through the...
The channel factors during signal propagation from the satellite to moving user terminal (UT) is comprehensively analyzed. Then an algorithm is presented to model dual-polarized MIMO LMS channel, which investigates almost all channel factors including temporal and polarization correlation, line-of-sight (LOS) shadowing, multipath effect, cross-polar discrimination (XPD) of antennas, cross-polar coupling...
Maximum-distance-separable (MDS) codes are a class of erasure codes that are widely adopted to enhance the reliability of distributed storage systems (DSS). In this paper, we develop a new approach to construction of simple (5, 3) MDS codes. With judiciously block-designed generator matrices, we show that the proposed MDS codes have a minimum stripe size α = 2 and can be constructed over a small (Galois)...
This paper mainly focuses on the servo control system of the flying shear. In this paper, we abandoned the previous combination of PLC with a motor controller or a dedicated motion controller. A universal servo controller with electronic cam function is proposed as the main controller. This servo controller directly controls the servo geared motor of the flying shear cutter, and it can also receive...
This paper studies the multiple fault estimation problem for a class of complex networks. A new distributed intermediate estimator is proposed, which has improved the nominal distributed intermediate estimator in the sense that less conservative sufficient conditions are derived. A numerical example is given to substantiate the effectiveness of the proposed method.
Among the high-radix and low-diameter networks, fat-tree topology is commonly used in HPC and datacenter systems. Resource and job management is critically important to mitigate application interference in order to achieve high system performance and utilization. Preliminary studies have shown the effect of job placement on parallel scientific applications performance. In this work we study interference...
Dragonfly network is widely used in modern high-performance computing systems. On this network, however, interference caused by network sharing can lead to significant network congestion and degraded performance. In this work, we present a comparative analysis of intra-application interference on applications with nearest neighbor communication, considering various placement strategies. Our results...
Previous study has demonstrated that pulsed HIFU with tens of microseconds pulse duration (PD) and 10kHz PRF is effective for cavitation generation. Meanwhile, with the assistance of PFC nanodroplets, cavitation can be further enhanced. Despite of higher efficiency, we also need cavitation to be precisely controlled and confined for sake of therapeutic safety, especially during the implementation...
The previous study has demonstrated that pulsed HIFU with tens of microseconds pulse duration and 10kHz pulse repetition frequency is effective for cavitation generation. With the assistance of perfluorocarbon (PFC) nano-droplets, cavitation can be further enhanced. But despite higher efficiency, we also need precisely controlled cavitation for sake of therapeutic safety. In this work, we propose...
Qos of broadband network is important. ISPs have some methods for evaluate it. But they are not efficient enough. This paper present a new method in which delay and scale of windows of TCP messages are used for evaluating performance of broadband. Comparison between delay or scale of window s of samples is the core idea of the method. There are two kinds of comparison. One is absolute terms of above-mentioned...
A feature selection method, GRRF-A, based on guided regularized random forest is proposed in this paper, aiming at solving marine diesel engine fault problem. GRRF-A improves GRRF algorithm according to the characteristics of marine diesel engine by using mean decrease in accuracy as importance measure, which is proven to be effective. The computation cost of GRRF-A is small and its results are relatively...
In recent years, the Center for Medicare and Medicaid Services (CMS) published 439 datasets containing rich information on healthcare providers, Accountable Care Organizations (ACO), Shared Patient Patterns ("referral data"), Medicare Utilization and Payments, etc. Combining these data can provide stakeholders a broader and more synergistic vision of the healthcare market. But the data integration...
In this paper, a discrete-time switched nonlinear system is proved to have an input-to-state stable (ISS) property under mode-dependent average dwell-time switching signals if each constituent subsystem is ISS. This result is then applied to stabilization of uncertain discrete-time nonlinear systems via an improved switching supervisory control scheme. The states of the closed-loop system are proved...
Air conditioning loads have the potential to participate in frequency response when the power shortage accident occurs. In this paper, a decentralized frequency response control strategy is proposed to take advantage of the potential of air condition loads. Firstly, we analyze the existing decentralized control strategy, which adjusts the setting temperature of air conditioners according to the frequency...
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