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Repetitive wave voltages should be used to perform partial discharge inception voltage (PDIV) tests on insulation systems of type I rotating machines fed by power electronics in qualification and type tests according to new standards published by International Electrotechnical Commission (IEC). To obtain objective test results, the influence of waveform parameters on PDIV results should be carefully...
An accurate measurement of the solar irradiance is of importance for evaluating and developing of solar renewable energy systems. However, devices for solar irradiance sensing (e.g. pyranometers and pyrheliometers) are usually expensive and difficult to calibrate. In this paper, a low-cost soft-sensor, implemented with a solar cell, is proposed for real-time estimation of solar irradiance. It applies...
A conformal low-profile cavity-backed slot antenna array is proposed in this paper. This proposed antenna array has 8-element cavity-backed slot antenna. The operating bandwidth of the proposed antenna array is ranging from 0.96f0 to 1.04f0 (where the f0 is center frequency of the target band) with the voltage standing wave ratio (VSWR) less than 2. Moreover, the depth of the cavity is only about...
Microblog opens a prosperous cyberspace, where people on the earth can quickly publish and receive information in a tremendously quick manner. Also different organizations including government create accounts in the microblog service in order to interact with the public society. Sina microblog service, as being the biggest Chinese microblog service player, attracts millions of users and organizations...
The Focal Underdetermined System Solver (FOCUSS) method is widely applied in the compressive sensing (CS) based high resolution range profile (HRRP) reconstruction. However, the parameter estimation of the scattering center type is not accurate enough. In this paper, an algorithm named by local reoptimization FOCUSS is presented to deal with such a case. After the traditional FOCUSS algorithm being...
In order to detect and track the moving weak multitarget through ubiquitous radar observations, this paper proposes a cardinalized probability hypothesis density (CPHD) filter based on sequential Monte Carlo (SMC) implementation. The traditional tracking method, such as joint probabilistic data association (JPDA) algorithm, suffers from computational problem in closely-spaced targets and low signal-to-noise...
A safety evaluation method based on an entropy weight method is proposed that is aimed at the features of heavy-duty computer numerical control (CNC) machine tools, such as long-life cycle, complex structure, high cost and many hidden safety risks. According to the risk sources of each phase of the total life cycle, the expert-scoring table is formulated and the process of experts' scoring is developed...
A new static power clamp circuit integrated with input ESD protection is proposed in this paper. By skillfully incorporating traditional input ESD protection, the proposed circuit replaces the protection resistor by the active switch and merging the signal control circuit into trigger circuit of static power clamp. The proposed circuit is a whole-chip ESD protection scheme that has a low leakage and...
Testing FPGA switching characteristics on general purpose electronic test equipment(GPETE) test platform has much lower financial cost and more accessibility than testing on Automatic Test Equipment(ATE). However, when testing on GPETE platform, test accuracy is more easily influenced by device under test(DUT) board and test equipment, and some kinds of stimuli such as maximum frequency stimulus is...
DSP blocks are integrated in most modern high-performance FPGA devices in order to improve the speed and efficiency of computation-intensive DSP designs. Based on the existing ones, this paper proposes a new DSP block which can improve the speed and area-efficiency by reducing the delay of cascade path and supporting multi-input addition. Both architecture and implementation are described. Virtual...
Northwest China is rich in energy resources including the renewable energy, therefore the power supply in some areas of the northwest power grid is in high density, which leads to the fact that the short-circuit current is too large and the series reactor might be used to suppress short circuit current. However, the series reactor application is also likely to leads to the slower decayed DC component...
In traditional ground-based inierferometric synthetic aperture radar (GB-InSAR) signal processing procedure, the image registration and phase unwrapping are the necessary steps to terrain mapping. In this paper, a simplified signal processing procedure for the downward-looking GB-InSAR to terrain mapping is proposed, which focuses pairs of complex radar images on the ground-range plane by the back-projection...
This paper presents a method to compute the Horizontal Protection Level (HPL) using the vertical projection, which will exploit advances in computational power to meet the requirement of Time to Alert (TTA) and simplify the process. And a traditional method to calculated HPL and vertical projection method is discussed. It is validated with results that the new method is achieved with the requirements...
In Residue Number System-based systems, how to select moduli set and evaluate its performance is an important issue. The objective of this study is to propose a systemic performance evaluation method for RNS based on the properties of moduli set. By abstracting the inherent properties of moduli sets, such as the complexity of arithmetic units, utilization ratio of dynamic range, parallelism and balance...
Speech is not only a way for infants under one year of age to communicate with the outside world, but also the important information source to reflect their emotions and needs, as well as health status and mental level. In order to explore the intelligent machine technology for understanding infant's emotions and needs from speech signals, and therefore help parents in child rearing, this paper studied...
Content-based image retrieval (CBIR) technique for digital image searching has been applied in medical images which are called content-based medical image retrieval (CBMIR). In this paper, we combine texture, density and shape features for CBMIR based on 3D multi-phase contrast enhanced CT images according to radiologists' clinical experience. And a database of 132 focal liver lesions (FLLs) with...
Undeniability is an essential security property of the traditional digital signature. Strong designated verifier signature(DSVS) is a special digital signature in where the validity of a signature can only be checked by the designated verifier. However, most strong DSVS schemes do not have the undeniability property which leads to dispute between a designated verifier and a signer. In this study,...
Recently, a directed graph model was presented to crowd counting in videos, and people flow was viewed as an integer flow on the constructed graph. The authors show that the network flow constraints on the graphs help to obtain consistent counting results. In this paper, we improve their work from two aspects. First, we design block histogram features for each group of people. Second, we simplify...
Recently, a directed graph model was presented to crowd counting in videos, and people flow was viewed as an integer flow on the constructed graph. The authors show that the network flow constraints on the graphs help to obtain consistent counting results. In this paper, we improve their work from two aspects. First, we design block histogram features for each group of people. Second, we simplify...
The influence of voltage duty cycle on partial discharge (PD) characteristics and endurance of inverter-fed motor insulation were investigated through tests performed on single-contact crossed enameled wires under bipolar repetitive square wave voltages with different duty cycles. The PD patterns, amplitude, repetition rate and lifetime obtained show that short duty cycles, i.e., lower than 50 µs,...
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