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We use the visibility graph analysis to research EEG signal and construct the complex network of EEG signal. In the paper, we construct the network by using EEG signal of the people with occupational stress and the normal people. Some properties of the complex network are found in this paper. The results of our experiment show that the properties of the normal people and the people with occupational...
Lately, last-mile issue is of great concerns to cope with the dramatic developments of internet shopping market in China. Several issues arise from home delivery activities for fulfilling those internet shopping orders, e.g., increased operating costs for handing failed home deliveries, and deteriorated traffic conditions due to frequent delivery trips. To improve the logistics efficiency of home...
Techniques of data assimilation (DA) for parameter identification and forecasting in complex dynamical systems offer promising tools for the analysis of neural data and inference of neural function. Here we present experiments using DA to characterize the dynamics of a neuromorphic very large-scale integrated (VLSI) circuit emulating membrane dynamics and channel kinetics in a network of 4 generalized...
A mechanism of communication through plasma sheaths which surround vehicles traveling at hypersonic velocities is introduced. The idea is to use nonlinear effects to make the plasma sheath appear transparent.
Scale invariant feature transform(SIFT) is an algorithm to extract distinctive and invariant features from images to achieve reliable object matching between different images in variant scales and rotations. However, SIFT's huge computation impedes its real-time implementation. In this paper, a Fast-Gaussian SIFT(FG-SIFT) is proposed. Keypoint detection is optimized in FG-SIFT. SIFT's 2-D difference...
In this paper, an efficient algorithm strategy for synchronous rectification (SR) used in LLC resonant converters is proposed. The output voltage and the primary resonant inductor current of LLC converter are combined together to produce suitable drive signals for SR in the below resonance mode. In the other resonance modes, the drive signals for SR are synchronous with the drive signals of corresponding...
Hadoop distributed file system (HDFS) is a major distributed file system for commodity clusters and cloud computing. Its extensive scalability and replica fault tolerance scheme makes it well suited for data-intensive application. Due to the tremendous growth of data, many computation-centric applications also become data-intensive. However, they are not optimal on HDFS, which leaves plenty of space...
Cooling availability of data centers has drawn considerable attention from academia. This paper considers temperature control of a cluster of servers with different inlet air temperatures. A rule-based control approach and a model predictive control approach are proposed to find the optimal load distribution, which can lower the outlet air temperature of servers. Web request traces of WorldCup 98...
We present in this paper an interactive approach for semantically modeling indoor environments given only a singleindoor image as input, without requiring access to the scene or using any additional measurements like the RGBD cameras. Our key insight is that, although depth estimation from a single image is notoriously difficult, we can conveniently obtain a relatively accurate normal map, which essentially...
5G IoT communications have some new requirements on the whole system design, e.g., low cost, low power consumption, long distance coverage and massive connection. To fulfill all these requirements, a narrow-band SCMA scheme is proposed. Narrow band pulse shaping is employed, so that the coverage can be expanded with low-cost and low-power devices. Two types of waveforms are provided, both of which...
We design a kind of mixed high-index-contrast subwavelength grating/distributed Bragg reflector (HCG/DBR) multilayer reflectors. The mixed HCG/DBR multilayer reflectors provide a broadband high reflectivity characteristic with several pairs which can replace conventional DBRs of InP-based materials. By applying the epitaxial lateral overgrowth (ELO), the design structure turns into a virtual InP substrate...
In this paper, we present a numerical simulation study of nitride-based p-i-n ultraviolet bandpass photodetectors, which was designed with a high Al composition AlGaN unipolar barrier layer. The AlGaN unipolar blocking layers act as potential barrier that reduce the collection of carriers generated by high energy photons in p-Al0.1Ga0.9N short-wave filter layer. Compared to the conventional nitride-based...
This paper presents design and implementations of a switch current sensor based on Rogowski coils. The current sensor is designed to address the issue of using desaturation circuit to protect the SiC MOSFET during shortcircuit. Specifications are given to meet the application requirement for SiC MOSFETs. It is also designed for high accuracy and high bandwidth for converter current control. PCB-based...
Bearing fault diagnosis of direct-drive (i.e., no gearbox) wind turbines is a challenging issue due to the varying shaft rotating frequency (SRF) caused by the erratic wind environment. To solve the spectrum smearing problem of the SRF-related components and remove the disturbances of the SRF-unrelated components in a measured signal, this paper proposes a novel method, called multiscale filtering...
This paper presents a systematic study of the busbar design and optimization for SiC-based H-bridge power electronics building block (PEBB) used in high-frequency and high-power applications. Step-by-step guidelines are presented in which the design considerations and analysis are given. This paper presents a double-sided busbar concept to create a compact PEBB design with improved thermal and switching...
This paper proposes a novel vibration and current information fusion-based fault diagnostic method for drivetrain gearboxes. First, two multiclass support vector machines (SVMs) are designed to output the probabilities of different fault (or health condition) classes according to the input features extracted from a vibration signal and a current signal collected from the condition monitoring system,...
This paper compares four different commutation strategies for a new monolithic dual-gate bidirectional IGBT (BD-IGBT) in matrix converters. A new variable-timing four-step commutation and an one-step commutation control strategies are proposed and compared with the conventional and the two-level four-step commutation methods reported previously. Operation modes and power losses of the BD-IGBT using...
Aspect angle estimation of the targets is of great help to computational reduction for template-based synthetic aperture radar (SAR) automation target recognition (ATR) algorithms. An effective aspect angle estimation algorithm of targets in SAR images based on sparse representation is proposed in this paper. The spare vector is firstly obtained under the dictionary which is constructed by all the...
Due to the obvious advantages in terms of aerial surveillance and anti-jamming, passive radar system (PRS) has been widely studied over the last years. However, a considerable part of the research on the PRS has been carried out in the laboratory environment and few practical results have been disclosed. In this paper, the design and implementation of an ongoing frequency modulated (FM)-based multi-frequency...
Lung cancer is the leading cause of cancer mortality around the world, the early diagnosis of lung cancer plays a very important role in therapeutic regimen selection. However, lung cancers are spatially and temporally heterogeneous; this limits the use of invasive biopsy. But radiomics which refers to the comprehensive quantification of tumour phenotypes by applying a large number of quantitative...
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