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An efficient method for ship detection is proposed, aiming at high-resolution Synthetic Aperture Radar (SAR) images. The signal-to-clutter ratio (SCR) is low due to interferers, including SAR ambiguity, inherent speckle, and wake clutters. Besides, internal weak scatters in target region bring challenge to detect complete ship profiles. A homogenized saliency map is generated for ship detection. The...
Nowadays synthetic aperture radar (SAR) images offer a great potential in observing and monitoring the maritime environment and many efforts have been devoted on ship detection. Despite of the internal speckle noise and SAR ambiguities, the increased image resolution brings about new challenge for accurate ship detection. Four ship detection schemes are studied and compared in this paper: the CA-CFAR...
The back-projection (BP) algorithm is an ideal solution for airborne synthetic aperture radar (SAR) imaging. However, trajectory deviations degrade BP focusing performance dramatically due to the accuracy limitation of navigation system. In this paper, we propose a novel autofocus method compatible with the BP imagery, which can correct the 3D trajectory deviations. In the new method, multiple local...
This paper presents an overview of three works about graphene-based resistive random access memory (RRAM). The fabrication, device performance and working mechanism of graphene-inserted electrode RRAM, RRAM based on laser-scribed reduced graphene and gate-controlled graphene-electrode RRAM are introduced. This work may inspire new design of high-performance RRAM based on two-dimensional material and...
With the fast development of mobile Internet, ecommerce has been widely applied to the living of the masses. Because of the strong dependence of e-commerce, logistics industry has attracted much attention. However, when users get convenient service from the logistics industry, their privacy is compromised. Addresses, phone numbers and other private information on the parcel are accessible to anyone...
This paper builds a three-dimension electromagnetic model of a reverberation chamber and solves the electromagnetic field distribution through finite element method. This paper deals with data of electromagnetic field through statistics, and attains statistical parameters such as correlation coefficient and standard deviation. To validate the simulation results, this paper compares the simulation...
Keyboard, mouse as fundamental input devices of computer systems, have changed traditional input behavior of human beings & writing experiences. However, handwriting, painting are still indispensable communication styles. In recent years, touch screen has become a prevailing human computer interface on many kinds of digital devices, which makes it possible for people using a pen to take notes...
A novel implantation-free 2-step junction termination extension (2S) with 2 space modulated buffer trench (2SMBT) zones is presented for ultrahigh voltage (>10kV) 4H-SiC gate turn off thyristor (GTO). The systematic studies on the optimization of the structure by Sentaurus TCAD tools were performed. The results show the 2SMBT structure introduced to the conventional 2S can effectively improve the...
Open surgery is currently the main treatment method for the lumbar burst fracture with neurological deficit but may irreversibly disrupt the lumbar anatomy. The minimally invasive surgery (MIS) techniques have gained increasing attentions recently. However, their use is still limited to lumbar burst fractures mainly due to their difficulties in burst fracture reduction and decompression. Here we present...
An adaptive threshold shot detection algorithm based on improved block color features is proposed in this paper. This paper adopts an improved block color feature extraction method based on equal area of rectangular ring. Sub-block accumulative color histogram is extracted as color features and different weight for different rectangle rings is set in order to highlight the central part of frame. Then,...
In this paper, we present a classification method based on the multi-level brain partitions. Bag-of-visual-words model is used. Firstly, the representative SIFT features are extracted from brain template as the basic visual words. Secondly, individual MR images are described using the basic visual words and support vector machine classifiers are trained for different brain partitions respectively...
Near threshold voltage computing enables transistor voltage scaling to continue with Moore's Law projection and dramatically improves power and energy efficiency. However, reducing the supply voltage to near-threshold level significantly increases the susceptibility of on-chip caches to process variations, leading to the high error rate. Most existing fault-tolerant schemes significantly sacrifice...
This paper deals with the problem of attitude tracking control for MEVs (Mars entry vehicles). The rotational motion of MEVs system consists of fast subsystem and slow subsystem. The attitude dynamics are given by slow subsystem and angular velocity dynamics are given by fast subsystem. A T-S fuzzy modal is achieved to approximate the fast subsystem. Based on this obtained model, the attitude tracking...
Accurate and quick parameter estimation of linear Frequency Modulation (LFM) signal is always the research hot. In this paper, an improved dual-channel joint analysis of measurement algorithm is proposed for the recognition and parameter estimation of cross-channel LFM signal. First, coarse chirp rates are estimated by delay-related correlative dechirp, and then signal is identified coarsely by a...
Controlling the light (or electromagnetic wave) propagation at will is what the people are always in pursuit of. In recent year, light beam has been discovered in novel forms with nondiffracting properties rather than the common Gaussian beam (e.g., Bessel beam, Airy beam, Mathieu and Webber beams, etc.). Moreover, these novel beams have even been realized in the surface plasmon polaritons (SPP),...
Because spaceborne electronic reconnaissance is restricted by limited aerospace-grade electronic devices, data processing speed, storage capacity, and downlink speed, traditional electronic reconnaissance satellite is difficult to realize real-time spectrum monitoring, signal detection and capture in wide band for long. So in this paper, two main wideband real-time spectrum analysis (RTSA) technology...
Aiming at the high data rate of wideband radar signal reconnaissance system, a high-speed real-time processing system based on multi-DSP is designed and realized in this paper. According to the application background, optimization measures such as reasonable tasks assignment and ping-pong buffer strategy are applied. The test results show the good performance of the system.
Aiming at pulse detection in practical complex environment applications, a new method based on frequency-domain constant false alarm rate (CFAR) detector is proposed in this paper. First, short time Fourier transform (STFT) is carried out. Then frequency-domain CFAR detector is used to judge whether signal exists or not in each STFT window. Finally the complete pulse is detected by sliding the STFT...
GPU has been generally accepted as an efficient accelerator in the field of high performance computing (HPC). On some heterogeneous systems, multiple GPUs are installed on each computing node. To make things more complicated, these GPUs may even have different architectures. Therefore, it is a challenge to efficiently schedule tasks and data on heterogeneous system. In this paper, we present DoSFoG,...
The asymptotical stability for a class of neutral systems with time-varying delay and nonlinearity is studied. Together with triple integral functional technique, through choosing an augmented Lyapunov-Krasovskii functional (LKF) and using some novel integral inequalities, then combined convex combination technique is used to give more tighter bound on the derivative of LKF and a stability criterion...
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